# HG changeset patch
# User jwilhelm
# Date 1515808582 -3600
# Node ID 7bba05746c444103a9fccd89d9cf55ba80e5a9f7
# Parent  a587f95313f10f3697fdf854132e7aa44281a282# Parent  b96f037965805c2a50598f7b9361581f7dfd1790
Merge

diff -r a587f95313f1 -r 7bba05746c44 make/data/jdwp/jdwp.spec
--- a/make/data/jdwp/jdwp.spec	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/data/jdwp/jdwp.spec	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -869,7 +869,6 @@
         "section in "
         "<cite>The Java&trade; Virtual Machine Specification</cite>. "
         "Since JDWP version 1.5."
-        "<p>
         (Out
             (referenceType refType "The reference type ID.")
         )
@@ -2723,7 +2722,6 @@
         "<P>"
         "The events that are grouped in a composite event are restricted in the "
         "following ways: "
-        "<P>"
         "<UL>"
         "<LI>Only with other thread start events for the same thread:"
         "    <UL>"
diff -r a587f95313f1 -r 7bba05746c44 make/jdk/src/classes/build/tools/jdwpgen/AbstractCommandNode.java
--- a/make/jdk/src/classes/build/tools/jdwpgen/AbstractCommandNode.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/jdk/src/classes/build/tools/jdwpgen/AbstractCommandNode.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,8 +30,8 @@
 class AbstractCommandNode extends AbstractNamedNode {
 
     void document(PrintWriter writer) {
-        writer.println("<h5><a name=\"" + context.whereC + "\">" + name +
-                       " Command</a> (" + nameNode.value() + ")</h5>");
+        writer.println("<h5 id=\"" + context.whereC + "\">" + name +
+                       " Command (" + nameNode.value() + ")</h5>");
         writer.println(comment());
         writer.println("<dl>");
         for (Node node : components) {
diff -r a587f95313f1 -r 7bba05746c44 make/jdk/src/classes/build/tools/jdwpgen/AbstractNamedNode.java
--- a/make/jdk/src/classes/build/tools/jdwpgen/AbstractNamedNode.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/jdk/src/classes/build/tools/jdwpgen/AbstractNamedNode.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -62,8 +62,8 @@
     }
 
     void document(PrintWriter writer) {
-        writer.println("<h4><a name=" + name + ">" + name +
-                       " Command Set</a></h4>");
+        writer.println("<h4 id=\"" + name + "\">" + name +
+                       " Command Set</h4>");
         for (Node node : components) {
             node.document(writer);
         }
diff -r a587f95313f1 -r 7bba05746c44 make/jdk/src/classes/build/tools/jdwpgen/AbstractTypeListNode.java
--- a/make/jdk/src/classes/build/tools/jdwpgen/AbstractTypeListNode.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/jdk/src/classes/build/tools/jdwpgen/AbstractTypeListNode.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -43,11 +43,11 @@
         if (components.isEmpty()) {
             writer.println("<dd>(None)");
         } else {
-            writer.println("<dd><table border=1 cellpadding=3 cellspacing=0 width=\"90%\" summary=\"\"><tr>");
+            writer.println("<dd><table><tr>");
             for (int i = maxStructIndent; i > 0; --i) {
-                writer.print("<th width=\"4%\">");
+                writer.print("<th style=\"width: 4%\">");
             }
-            writer.println("<th width=\"15%\"><th width=\"65%\">");
+            writer.println("<th style=\"width: 15%\"><th style=\"width: 65%\">");
             writer.println("");
             for (Node node : components) {
                 node.document(writer);
diff -r a587f95313f1 -r 7bba05746c44 make/jdk/src/classes/build/tools/jdwpgen/CommandSetNode.java
--- a/make/jdk/src/classes/build/tools/jdwpgen/CommandSetNode.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/jdk/src/classes/build/tools/jdwpgen/CommandSetNode.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -38,8 +38,8 @@
     }
 
     void document(PrintWriter writer) {
-        writer.println("<h4><a name=\"" + context.whereC + "\">" + name +
-                       " Command Set</a> (" +
+        writer.println("<h4 id=\"" + context.whereC + "\">" + name +
+                       " Command Set (" +
                        nameNode.value() + ")</h4>");
         writer.println(comment());
         for (Node node : components) {
@@ -51,11 +51,13 @@
         writer.print("<li><a href=\"#" + context.whereC + "\">");
         writer.println(name() + "</a> Command Set (" +
                        nameNode.value() + ")");
-        writer.println("<ul>");
-        for (Node node : components) {
-            node.documentIndex(writer);
+        if (components.size() > 0) {
+            writer.println("<ul>");
+            for (Node node : components) {
+                node.documentIndex(writer);
+            }
+            writer.println("</ul>");
         }
-        writer.println("</ul>");
     }
 
     void genJavaClassSpecifics(PrintWriter writer, int depth) {
diff -r a587f95313f1 -r 7bba05746c44 make/jdk/src/classes/build/tools/jdwpgen/ConstantSetNode.java
--- a/make/jdk/src/classes/build/tools/jdwpgen/ConstantSetNode.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/jdk/src/classes/build/tools/jdwpgen/ConstantSetNode.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -54,15 +54,15 @@
     }
 
     void document(PrintWriter writer) {
-        writer.println("<h4><a name=\"" + context.whereC + "\">" + name +
-                       " Constants</a></h4>");
+        writer.println("<h4 id=\"" + context.whereC + "\">" + name +
+                       " Constants</h4>");
         writer.println(comment());
-        writer.println("<dd><table border=1 cellpadding=3 cellspacing=0 width=\"90%\" summary=\"\"><tr>");
-        writer.println("<th width=\"20%\"><th width=\"5%\"><th width=\"65%\">");
+        writer.println("<table><tr>");
+        writer.println("<th style=\"width: 20%\"><th style=\"width: 5%\"><th style=\"width:  65%\">");
         ConstantNode n;
         for (Node node : components) {
             n = (ConstantNode)node;
-            writer.println("<a NAME=\"" + name + "_" + n.name + "\"></a>");
+            writer.println("<span id=\"" + name + "_" + n.name + "\"></span>");
             n.document(writer);
         }
         writer.println("</table>");
diff -r a587f95313f1 -r 7bba05746c44 make/jdk/src/classes/build/tools/jdwpgen/ErrorSetNode.java
--- a/make/jdk/src/classes/build/tools/jdwpgen/ErrorSetNode.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/jdk/src/classes/build/tools/jdwpgen/ErrorSetNode.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -43,7 +43,7 @@
         if (components.isEmpty()) {
             writer.println("<dd>(None)");
         } else {
-            writer.println("<dd><table border=1 cellpadding=3 cellspacing=0 width=\"90%\" summary=\"\">");
+            writer.println("<dd><table>");
         for (Node node : components) {
             node.document(writer);
         }
diff -r a587f95313f1 -r 7bba05746c44 make/jdk/src/classes/build/tools/jdwpgen/RootNode.java
--- a/make/jdk/src/classes/build/tools/jdwpgen/RootNode.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/jdk/src/classes/build/tools/jdwpgen/RootNode.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -41,11 +41,22 @@
 
     void document(PrintWriter writer) {
         writer.println("<!DOCTYPE html>");
-        writer.println("<html><head><title>" + comment() + "</title></head>");
-        writer.println("<body bgcolor=\"white\">");
+        writer.println("<html lang=\"en\">");
+        writer.println("<head>");
+        writer.println("<meta charset=\"utf-8\"/>");
+        writer.println("<title>" + comment() + "</title>");
+        writer.println("<style>");
+        writer.println("body {background-color:white;}");
+        writer.println("table {border: 1px solid grey; border-spacing:0px; border-collapse: separate; width: 90%;}");
+        writer.println("td, th {padding: 3px; border: 1px solid black;}");
+        writer.println("</style>");
+        writer.println("</head>");
+        writer.println("<body>");
+        writer.println("<ul>");
         for (Node node : components) {
             node.documentIndex(writer);
         }
+        writer.println("</ul>");
         for (Node node : components) {
             node.document(writer);
         }
diff -r a587f95313f1 -r 7bba05746c44 make/test/JtregNativeHotspot.gmk
--- a/make/test/JtregNativeHotspot.gmk	Fri Jan 19 17:11:52 2018 +0100
+++ b/make/test/JtregNativeHotspot.gmk	Sat Jan 13 02:56:22 2018 +0100
@@ -44,6 +44,7 @@
 # Add more directories here when needed.
 BUILD_HOTSPOT_JTREG_NATIVE_SRC += \
     $(TOPDIR)/test/hotspot/jtreg/gc/g1/TestJNIWeakG1 \
+    $(TOPDIR)/test/hotspot/jtreg/gc/stress/TestJNIBlockFullGC \
     $(TOPDIR)/test/hotspot/jtreg/gc/stress/gclocker \
     $(TOPDIR)/test/hotspot/jtreg/gc/cslocker \
     $(TOPDIR)/test/hotspot/jtreg/native_sanity \
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/aarch64/assembler_aarch64.hpp
--- a/src/hotspot/cpu/aarch64/assembler_aarch64.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/aarch64/assembler_aarch64.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -2295,23 +2295,32 @@
     rf(Vn, 5), rf(Rd, 0);
   }
 
-#define INSN(NAME, opc, opc2)                                           \
+#define INSN(NAME, opc, opc2, isSHR)                                    \
   void NAME(FloatRegister Vd, SIMD_Arrangement T, FloatRegister Vn, int shift){ \
     starti;                                                             \
-    /* The encodings for the immh:immb fields (bits 22:16) are          \
-     *   0001 xxx       8B/16B, shift = xxx                             \
-     *   001x xxx       4H/8H,  shift = xxxx                            \
-     *   01xx xxx       2S/4S,  shift = xxxxx                           \
-     *   1xxx xxx       1D/2D,  shift = xxxxxx (1D is RESERVED)         \
+    /* The encodings for the immh:immb fields (bits 22:16) in *SHR are  \
+     *   0001 xxx       8B/16B, shift = 16  - UInt(immh:immb)           \
+     *   001x xxx       4H/8H,  shift = 32  - UInt(immh:immb)           \
+     *   01xx xxx       2S/4S,  shift = 64  - UInt(immh:immb)           \
+     *   1xxx xxx       1D/2D,  shift = 128 - UInt(immh:immb)           \
+     *   (1D is RESERVED)                                               \
+     * for SHL shift is calculated as:                                  \
+     *   0001 xxx       8B/16B, shift = UInt(immh:immb) - 8             \
+     *   001x xxx       4H/8H,  shift = UInt(immh:immb) - 16            \
+     *   01xx xxx       2S/4S,  shift = UInt(immh:immb) - 32            \
+     *   1xxx xxx       1D/2D,  shift = UInt(immh:immb) - 64            \
+     *   (1D is RESERVED)                                               \
      */                                                                 \
     assert((1 << ((T>>1)+3)) > shift, "Invalid Shift value");           \
+    int cVal = (1 << (((T >> 1) + 3) + (isSHR ? 1 : 0)));               \
+    int encodedShift = isSHR ? cVal - shift : cVal + shift;             \
     f(0, 31), f(T & 1, 30), f(opc, 29), f(0b011110, 28, 23),            \
-    f((1 << ((T>>1)+3))|shift, 22, 16); f(opc2, 15, 10), rf(Vn, 5), rf(Vd, 0); \
+    f(encodedShift, 22, 16); f(opc2, 15, 10), rf(Vn, 5), rf(Vd, 0);     \
   }
 
-  INSN(shl,  0, 0b010101);
-  INSN(sshr, 0, 0b000001);
-  INSN(ushr, 1, 0b000001);
+  INSN(shl,  0, 0b010101, /* isSHR = */ false);
+  INSN(sshr, 0, 0b000001, /* isSHR = */ true);
+  INSN(ushr, 1, 0b000001, /* isSHR = */ true);
 
 #undef INSN
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/arm/templateTable_arm.cpp
--- a/src/hotspot/cpu/arm/templateTable_arm.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/arm/templateTable_arm.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -4335,7 +4335,6 @@
   Label done;
   Label initialize_header;
   Label initialize_object;  // including clearing the fields
-  Label allocate_shared;
 
   const bool allow_shared_alloc =
     Universe::heap()->supports_inline_contig_alloc();
@@ -4380,13 +4379,19 @@
   // Klass::_lh_instance_slow_path_bit is really a bit mask, not bit number
   __ tbnz(Rsize, exact_log2(Klass::_lh_instance_slow_path_bit), slow_case);
 
+  // Allocate the instance:
+  //  If TLAB is enabled:
+  //    Try to allocate in the TLAB.
+  //    If fails, go to the slow path.
+  //  Else If inline contiguous allocations are enabled:
+  //    Try to allocate in eden.
+  //    If fails due to heap end, go to slow path.
   //
-  // Allocate the instance
-  // 1) Try to allocate in the TLAB
-  // 2) if fail and the object is large allocate in the shared Eden
-  // 3) if the above fails (or is not applicable), go to a slow case
-  // (creates a new TLAB, etc.)
-
+  //  If TLAB is enabled OR inline contiguous is enabled:
+  //    Initialize the allocation.
+  //    Exit.
+  //
+  //  Go to slow path.
   if (UseTLAB) {
     const Register Rtlab_top = R1_tmp;
     const Register Rtlab_end = R2_tmp;
@@ -4396,7 +4401,7 @@
     __ ldr(Rtlab_end, Address(Rthread, in_bytes(JavaThread::tlab_end_offset())));
     __ add(Rtlab_top, Robj, Rsize);
     __ cmp(Rtlab_top, Rtlab_end);
-    __ b(allow_shared_alloc ? allocate_shared : slow_case, hi);
+    __ b(slow_case, hi);
     __ str(Rtlab_top, Address(Rthread, JavaThread::tlab_top_offset()));
     if (ZeroTLAB) {
       // the fields have been already cleared
@@ -4405,45 +4410,43 @@
       // initialize both the header and fields
       __ b(initialize_object);
     }
-  }
-
-  // Allocation in the shared Eden, if allowed.
-  if (allow_shared_alloc) {
-    __ bind(allocate_shared);
-
-    const Register Rheap_top_addr = R2_tmp;
-    const Register Rheap_top = R5_tmp;
-    const Register Rheap_end = Rtemp;
-    assert_different_registers(Robj, Rklass, Rsize, Rheap_top_addr, Rheap_top, Rheap_end, LR);
-
-    // heap_end now (re)loaded in the loop since also used as a scratch register in the CAS
-    __ ldr_literal(Rheap_top_addr, Lheap_top_addr);
-
-    Label retry;
-    __ bind(retry);
+  } else {
+    // Allocation in the shared Eden, if allowed.
+    if (allow_shared_alloc) {
+      const Register Rheap_top_addr = R2_tmp;
+      const Register Rheap_top = R5_tmp;
+      const Register Rheap_end = Rtemp;
+      assert_different_registers(Robj, Rklass, Rsize, Rheap_top_addr, Rheap_top, Rheap_end, LR);
+
+      // heap_end now (re)loaded in the loop since also used as a scratch register in the CAS
+      __ ldr_literal(Rheap_top_addr, Lheap_top_addr);
+
+      Label retry;
+      __ bind(retry);
 
 #ifdef AARCH64
-    __ ldxr(Robj, Rheap_top_addr);
+      __ ldxr(Robj, Rheap_top_addr);
 #else
-    __ ldr(Robj, Address(Rheap_top_addr));
+      __ ldr(Robj, Address(Rheap_top_addr));
 #endif // AARCH64
 
-    __ ldr(Rheap_end, Address(Rheap_top_addr, (intptr_t)Universe::heap()->end_addr()-(intptr_t)Universe::heap()->top_addr()));
-    __ add(Rheap_top, Robj, Rsize);
-    __ cmp(Rheap_top, Rheap_end);
-    __ b(slow_case, hi);
-
-    // Update heap top atomically.
-    // If someone beats us on the allocation, try again, otherwise continue.
+      __ ldr(Rheap_end, Address(Rheap_top_addr, (intptr_t)Universe::heap()->end_addr()-(intptr_t)Universe::heap()->top_addr()));
+      __ add(Rheap_top, Robj, Rsize);
+      __ cmp(Rheap_top, Rheap_end);
+      __ b(slow_case, hi);
+
+      // Update heap top atomically.
+      // If someone beats us on the allocation, try again, otherwise continue.
 #ifdef AARCH64
-    __ stxr(Rtemp2, Rheap_top, Rheap_top_addr);
-    __ cbnz_w(Rtemp2, retry);
+      __ stxr(Rtemp2, Rheap_top, Rheap_top_addr);
+      __ cbnz_w(Rtemp2, retry);
 #else
-    __ atomic_cas_bool(Robj, Rheap_top, Rheap_top_addr, 0, Rheap_end/*scratched*/);
-    __ b(retry, ne);
+      __ atomic_cas_bool(Robj, Rheap_top, Rheap_top_addr, 0, Rheap_end/*scratched*/);
+      __ b(retry, ne);
 #endif // AARCH64
 
-    __ incr_allocated_bytes(Rsize, Rtemp);
+      __ incr_allocated_bytes(Rsize, Rtemp);
+    }
   }
 
   if (UseTLAB || allow_shared_alloc) {
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/c1_MacroAssembler_ppc.cpp
--- a/src/hotspot/cpu/ppc/c1_MacroAssembler_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/c1_MacroAssembler_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
+ * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -34,8 +34,8 @@
 #include "runtime/basicLock.hpp"
 #include "runtime/biasedLocking.hpp"
 #include "runtime/os.hpp"
+#include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"
-#include "runtime/sharedRuntime.hpp"
 #include "utilities/align.hpp"
 
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/c1_globals_ppc.hpp
--- a/src/hotspot/cpu/ppc/c1_globals_ppc.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/c1_globals_ppc.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,36 +33,36 @@
 // (see c1_globals.hpp)
 
 #ifndef TIERED
-define_pd_global(bool, BackgroundCompilation,        true );
-define_pd_global(bool, CICompileOSR,                 true );
-define_pd_global(bool, InlineIntrinsics,             true );
-define_pd_global(bool, PreferInterpreterNativeStubs, false);
-define_pd_global(bool, ProfileTraps,                 false);
-define_pd_global(bool, UseOnStackReplacement,        true );
-define_pd_global(bool, TieredCompilation,            false);
-define_pd_global(intx, CompileThreshold,             1000 );
+define_pd_global(bool,     BackgroundCompilation,        true);
+define_pd_global(bool,     CICompileOSR,                 true);
+define_pd_global(bool,     InlineIntrinsics,             true);
+define_pd_global(bool,     PreferInterpreterNativeStubs, false);
+define_pd_global(bool,     ProfileTraps,                 false);
+define_pd_global(bool,     UseOnStackReplacement,        true);
+define_pd_global(bool,     TieredCompilation,            false);
+define_pd_global(intx,     CompileThreshold,             1000);
 
-define_pd_global(intx, OnStackReplacePercentage,     1400 );
-define_pd_global(bool, UseTLAB,                      true );
-define_pd_global(bool, ProfileInterpreter,           false);
-define_pd_global(intx, FreqInlineSize,               325  );
-define_pd_global(bool, ResizeTLAB,                   true );
-define_pd_global(intx, ReservedCodeCacheSize,        32*M );
-define_pd_global(intx, CodeCacheExpansionSize,       32*K );
-define_pd_global(uintx,CodeCacheMinBlockLength,      1);
-define_pd_global(uintx,MetaspaceSize,                12*M );
-define_pd_global(bool, NeverActAsServerClassMachine, true );
-define_pd_global(intx, NewSizeThreadIncrease,        16*K );
-define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
-define_pd_global(intx, InitialCodeCacheSize,         160*K);
+define_pd_global(intx,     OnStackReplacePercentage,     1400);
+define_pd_global(bool,     UseTLAB,                      true);
+define_pd_global(bool,     ProfileInterpreter,           false);
+define_pd_global(intx,     FreqInlineSize,               325 );
+define_pd_global(bool,     ResizeTLAB,                   true);
+define_pd_global(uintx,    ReservedCodeCacheSize,        32*M);
+define_pd_global(uintx,    CodeCacheExpansionSize,       32*K);
+define_pd_global(uintx,    CodeCacheMinBlockLength,      1);
+define_pd_global(size_t,   MetaspaceSize,                12*M);
+define_pd_global(bool,     NeverActAsServerClassMachine, true);
+define_pd_global(size_t,   NewSizeThreadIncrease,        16*K);
+define_pd_global(uint64_t, MaxRAM,                       1ULL*G);
+define_pd_global(uintx,    InitialCodeCacheSize,         160*K);
 #endif // !TIERED
 
-define_pd_global(bool, UseTypeProfile,               false);
-define_pd_global(bool, RoundFPResults,               false);
+define_pd_global(bool,     UseTypeProfile,               false);
+define_pd_global(bool,     RoundFPResults,               false);
 
-define_pd_global(bool, LIRFillDelaySlots,            false);
-define_pd_global(bool, OptimizeSinglePrecision,      false);
-define_pd_global(bool, CSEArrayLength,               true );
-define_pd_global(bool, TwoOperandLIRForm,            false);
+define_pd_global(bool,     LIRFillDelaySlots,            false);
+define_pd_global(bool,     OptimizeSinglePrecision,      false);
+define_pd_global(bool,     CSEArrayLength,               true);
+define_pd_global(bool,     TwoOperandLIRForm,            false);
 
 #endif // CPU_PPC_VM_C1_GLOBALS_PPC_HPP
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/c2_globals_ppc.hpp
--- a/src/hotspot/cpu/ppc/c2_globals_ppc.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/c2_globals_ppc.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2016 SAP SE. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -39,7 +39,7 @@
 define_pd_global(bool, ProfileTraps,                 true);
 define_pd_global(bool, UseOnStackReplacement,        true);
 define_pd_global(bool, ProfileInterpreter,           true);
-define_pd_global(bool, TieredCompilation,            true);
+define_pd_global(bool, TieredCompilation,            trueInTiered);
 define_pd_global(intx, CompileThreshold,             10000);
 
 define_pd_global(intx, OnStackReplacePercentage,     140);
@@ -78,27 +78,27 @@
 //   x.f = 0
 //   loc = x.f
 //   NullCheck loc
-define_pd_global(bool, OptoScheduling,               false);
-define_pd_global(bool, IdealizeClearArrayNode,       true);
+define_pd_global(bool,     OptoScheduling,               false);
+define_pd_global(bool,     IdealizeClearArrayNode,       true);
 
-define_pd_global(intx, InitialCodeCacheSize,         2048*K); // Integral multiple of CodeCacheExpansionSize
-define_pd_global(intx, ReservedCodeCacheSize,        256*M);
-define_pd_global(intx, NonProfiledCodeHeapSize,      125*M);
-define_pd_global(intx, ProfiledCodeHeapSize,         126*M);
-define_pd_global(intx, NonNMethodCodeHeapSize,       5*M  );
-define_pd_global(intx, CodeCacheExpansionSize,       64*K);
+define_pd_global(uintx,    InitialCodeCacheSize,         2048*K); // Integral multiple of CodeCacheExpansionSize
+define_pd_global(uintx,    ReservedCodeCacheSize,        256*M);
+define_pd_global(uintx,    NonProfiledCodeHeapSize,      125*M);
+define_pd_global(uintx,    ProfiledCodeHeapSize,         126*M);
+define_pd_global(uintx,    NonNMethodCodeHeapSize,       5*M  );
+define_pd_global(uintx,    CodeCacheExpansionSize,       64*K);
 
 // Ergonomics related flags
-define_pd_global(uint64_t, MaxRAM,                   4ULL*G);
-define_pd_global(uintx, CodeCacheMinBlockLength,     4);
-define_pd_global(uintx, CodeCacheMinimumUseSpace,    400*K);
+define_pd_global(uint64_t, MaxRAM,                       128ULL*G);
+define_pd_global(uintx,    CodeCacheMinBlockLength,      4);
+define_pd_global(uintx,    CodeCacheMinimumUseSpace,     400*K);
 
-define_pd_global(bool,  TrapBasedRangeChecks,        true);
+define_pd_global(bool,     TrapBasedRangeChecks,          true);
 
 // Heap related flags
-define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(16*M));
+define_pd_global(size_t,   MetaspaceSize,                ScaleForWordSize(16*M));
 
 // Ergonomics related flags
-define_pd_global(bool, NeverActAsServerClassMachine, false);
+define_pd_global(bool,     NeverActAsServerClassMachine, false);
 
 #endif // CPU_PPC_VM_C2_GLOBALS_PPC_HPP
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/c2_init_ppc.cpp
--- a/src/hotspot/cpu/ppc/c2_init_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/c2_init_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -29,11 +29,11 @@
 #include "runtime/globals.hpp"
 #include "utilities/debug.hpp"
 
-// processor dependent initialization for ppc
+// Processor dependent initialization of C2 compiler for ppc.
 
 void Compile::pd_compiler2_init() {
 
-  // Power7 and later
+  // Power7 and later.
   if (PowerArchitecturePPC64 > 6) {
     if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
       FLAG_SET_ERGO(bool, UsePopCountInstruction, true);
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/globals_ppc.hpp
--- a/src/hotspot/cpu/ppc/globals_ppc.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/globals_ppc.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2017 SAP SE. All rights reserved.
+ * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -86,14 +86,14 @@
 define_pd_global(bool, ThreadLocalHandshakes, true);
 
 // Platform dependent flag handling: flags only defined on this platform.
-#define ARCH_FLAGS(develop, \
-                   product, \
-                   diagnostic, \
+#define ARCH_FLAGS(develop,      \
+                   product,      \
+                   diagnostic,   \
                    experimental, \
-                   notproduct, \
-                   range, \
-                   constraint, \
-                   writeable)  \
+                   notproduct,   \
+                   range,        \
+                   constraint,   \
+                   writeable)    \
                                                                             \
   product(uintx, PowerArchitecturePPC64, 0,                                 \
           "CPU Version: x for PowerX. Currently recognizes Power5 to "      \
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/icache_ppc.cpp
--- a/src/hotspot/cpu/ppc/icache_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/icache_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2013 SAP SE. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,7 +24,6 @@
  */
 
 #include "precompiled.hpp"
-#include "assembler_ppc.inline.hpp"
 #include "runtime/icache.hpp"
 
 // Use inline assembler to implement icache flush.
@@ -32,7 +31,7 @@
   address end = start + (unsigned int)lines*ICache::line_size;
   assert(start <= end, "flush_icache parms");
 
-  // store modified cache lines from data cache
+  // Store modified cache lines from data cache.
   for (address a = start; a < end; a += ICache::line_size) {
     __asm__ __volatile__(
      "dcbst 0, %0  \n"
@@ -48,7 +47,7 @@
      :
      : "memory");
 
-  // invalidate respective cache lines in instruction cache
+  // Invalidate respective cache lines in instruction cache.
   for (address a = start; a < end; a += ICache::line_size) {
     __asm__ __volatile__(
      "icbi 0, %0   \n"
@@ -57,7 +56,7 @@
      : "memory");
   }
 
-  // discard fetched instructions
+  // Discard fetched instructions.
   __asm__ __volatile__(
      "isync \n"
      :
@@ -71,6 +70,8 @@
 
   *flush_icache_stub = (ICache::flush_icache_stub_t)ICache::ppc64_flush_icache;
 
-  // First call to flush itself
+  // First call to flush itself.
+  // Pointless since we call C, but it is expected to get
+  // executed during VM_Version::determine_features().
   ICache::invalidate_range((address)(*flush_icache_stub), 0);
 }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/interp_masm_ppc_64.cpp
--- a/src/hotspot/cpu/ppc/interp_masm_ppc_64.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/interp_masm_ppc_64.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2017 SAP SE. All rights reserved.
+ * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -32,6 +32,10 @@
 #include "runtime/safepointMechanism.hpp"
 #include "runtime/sharedRuntime.hpp"
 
+// Implementation of InterpreterMacroAssembler.
+
+// This file specializes the assembler with interpreter-specific macros.
+
 #ifdef PRODUCT
 #define BLOCK_COMMENT(str) // nothing
 #else
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/jniFastGetField_ppc.cpp
--- a/src/hotspot/cpu/ppc/jniFastGetField_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/jniFastGetField_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2013 SAP SE. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,7 +24,7 @@
  */
 
 #include "precompiled.hpp"
-#include "assembler_ppc.inline.hpp"
+#include "asm/assembler.inline.hpp"
 #include "memory/resourceArea.hpp"
 #include "prims/jniFastGetField.hpp"
 #include "prims/jvm_misc.hpp"
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/macroAssembler_ppc.cpp
--- a/src/hotspot/cpu/ppc/macroAssembler_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/macroAssembler_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2017, SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -2883,10 +2883,6 @@
     //assert(ObjectMonitor::recursions_size_in_bytes() == 8, "unexpected size");
     asm_assert_mem8_is_zero(ObjectMonitor::recursions_offset_in_bytes(), temp,
                             "monitor->_recursions should be 0", -1);
-    // Invariant 2: OwnerIsThread shouldn't be 0.
-    //assert(ObjectMonitor::OwnerIsThread_size_in_bytes() == 4, "unexpected size");
-    //asm_assert_mem4_isnot_zero(ObjectMonitor::OwnerIsThread_offset_in_bytes(), temp,
-    //                           "monitor->OwnerIsThread shouldn't be 0", -1);
 #   endif
 
 #if INCLUDE_RTM_OPT
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/nativeInst_ppc.hpp
--- a/src/hotspot/cpu/ppc/nativeInst_ppc.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/nativeInst_ppc.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
+ * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -26,7 +26,6 @@
 #ifndef CPU_PPC_VM_NATIVEINST_PPC_HPP
 #define CPU_PPC_VM_NATIVEINST_PPC_HPP
 
-#include "asm/assembler.hpp"
 #include "asm/macroAssembler.hpp"
 #include "memory/allocation.hpp"
 #include "runtime/icache.hpp"
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/runtime_ppc.cpp
--- a/src/hotspot/cpu/ppc/runtime_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/runtime_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,7 +25,6 @@
 
 #include "precompiled.hpp"
 #ifdef COMPILER2
-#include "asm/assembler.inline.hpp"
 #include "asm/macroAssembler.inline.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "code/vmreg.hpp"
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp
--- a/src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2017 SAP SE. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1912,8 +1912,8 @@
   // - *_slot_offset Indicates offset from SP in number of stack slots.
   // - *_offset      Indicates offset from SP in bytes.
 
-  int stack_slots = c_calling_convention(out_sig_bt, out_regs, out_regs2, total_c_args) // 1+2)
-                  + SharedRuntime::out_preserve_stack_slots(); // See c_calling_convention.
+  int stack_slots = c_calling_convention(out_sig_bt, out_regs, out_regs2, total_c_args) + // 1+2)
+                    SharedRuntime::out_preserve_stack_slots(); // See c_calling_convention.
 
   // Now the space for the inbound oop handle area.
   int total_save_slots = num_java_iarg_registers * VMRegImpl::slots_per_word;
@@ -2044,7 +2044,8 @@
   OopMap    *oop_map  = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
 
   if (is_critical_native) {
-    check_needs_gc_for_critical_native(masm, stack_slots, total_in_args, oop_handle_slot_offset, oop_maps, in_regs, in_sig_bt, r_temp_1);
+    check_needs_gc_for_critical_native(masm, stack_slots, total_in_args, oop_handle_slot_offset,
+                                       oop_maps, in_regs, in_sig_bt, r_temp_1);
   }
 
   // Move arguments from register/stack to register/stack.
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/stubGenerator_ppc.cpp
--- a/src/hotspot/cpu/ppc/stubGenerator_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/stubGenerator_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2017, SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -40,6 +40,10 @@
 #include "runtime/thread.inline.hpp"
 #include "utilities/align.hpp"
 
+// Declaration and definition of StubGenerator (no .hpp file).
+// For a more detailed description of the stub routine structure
+// see the comment in stubRoutines.hpp.
+
 #define __ _masm->
 
 #ifdef PRODUCT
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/stubRoutines_ppc_64.cpp
--- a/src/hotspot/cpu/ppc/stubRoutines_ppc_64.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/stubRoutines_ppc_64.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2017, SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -23,6 +23,7 @@
  *
  */
 
+#include "precompiled.hpp"
 #include "asm/macroAssembler.inline.hpp"
 #include "runtime/stubRoutines.hpp"
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/ppc/templateInterpreterGenerator_ppc.cpp
--- a/src/hotspot/cpu/ppc/templateInterpreterGenerator_ppc.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/ppc/templateInterpreterGenerator_ppc.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2015, 2017, SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -582,25 +582,6 @@
   return entry;
 }
 
-#if 0
-// Call special ClassCastException constructor taking object to cast
-// and target class as arguments.
-address TemplateInterpreterGenerator::generate_ClassCastException_verbose_handler() {
-  address entry = __ pc();
-
-  // Expression stack must be empty before entering the VM if an
-  // exception happened.
-  __ empty_expression_stack();
-
-  // Thread will be loaded to R3_ARG1.
-  // Target class oop is in register R5_ARG3 by convention!
-  __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException_verbose), R17_tos, R5_ARG3);
-  // Above call must not return here since exception pending.
-  DEBUG_ONLY(__ should_not_reach_here();)
-  return entry;
-}
-#endif
-
 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
   address entry = __ pc();
   // Expression stack must be empty before entering the VM if an
@@ -1896,7 +1877,6 @@
   return NULL;
 }
 
-
 /**
  * Method entry for static native methods:
  *   int java.util.zip.CRC32.updateBytes(     int crc, byte[] b,  int off, int len)
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/s390/bytes_s390.hpp
--- a/src/hotspot/cpu/s390/bytes_s390.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/s390/bytes_s390.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2016 SAP SE. All rights reserved.
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -42,11 +42,6 @@
   //
   // In short, it makes no sense on z/Architecture to piecemeal get or put unaligned data.
 
-  // Only swap on little endian machines => suffix `_le'.
-  static inline u2   swap_u2_le(u2 x) { return x; }
-  static inline u4   swap_u4_le(u4 x) { return x; }
-  static inline u8   swap_u8_le(u8 x) { return x; }
-
   static inline u2   get_native_u2(address p) { return *(u2*)p; }
   static inline u4   get_native_u4(address p) { return *(u4*)p; }
   static inline u8   get_native_u8(address p) { return *(u8*)p; }
@@ -55,7 +50,8 @@
   static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; }
   static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; }
 
-#include "bytes_linux_s390.inline.hpp"
+  // The following header contains the implementations of swap_u2, swap_u4, and swap_u8.
+#include OS_CPU_HEADER_INLINE(bytes)
 
   // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
   static inline u2   get_Java_u2(address p) { return get_native_u2(p); }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/s390/c1_globals_s390.hpp
--- a/src/hotspot/cpu/s390/c1_globals_s390.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/s390/c1_globals_s390.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2016 SAP SE. All rights reserved.
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -48,7 +48,7 @@
 define_pd_global(bool,     ProfileInterpreter,           false);
 define_pd_global(intx,     FreqInlineSize,               325);
 define_pd_global(bool,     ResizeTLAB,                   true);
-define_pd_global(intx,     ReservedCodeCacheSize,        32*M);
+define_pd_global(uintx,    ReservedCodeCacheSize,        32*M);
 define_pd_global(uintx,    NonProfiledCodeHeapSize,      13*M);
 define_pd_global(uintx,    ProfiledCodeHeapSize,         14*M);
 define_pd_global(uintx,    NonNMethodCodeHeapSize,       5*M);
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/s390/c2_globals_s390.hpp
--- a/src/hotspot/cpu/s390/c2_globals_s390.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/s390/c2_globals_s390.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2016 SAP SE. All rights reserved.
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -58,7 +58,7 @@
 define_pd_global(intx, LoopPercentProfileLimit,      10);
 define_pd_global(intx, MinJumpTableSize,             18);
 
-// Peephole and CISC spilling both break the graph, and so makes the
+// Peephole and CISC spilling both break the graph, and so make the
 // scheduler sick.
 define_pd_global(bool, OptoPeephole,                 false);
 define_pd_global(bool, UseCISCSpill,                 true);
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/cpu/s390/globals_s390.hpp
--- a/src/hotspot/cpu/s390/globals_s390.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/cpu/s390/globals_s390.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2016, 2017 Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2016, 2017 SAP SE. All rights reserved.
+ * Copyright (c) 2016, 2018 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -87,7 +87,14 @@
 
 define_pd_global(bool, ThreadLocalHandshakes, true);
 
-#define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct, range, constraint, writeable) \
+#define ARCH_FLAGS(develop,      \
+                   product,      \
+                   diagnostic,   \
+                   experimental, \
+                   notproduct,   \
+                   range,        \
+                   constraint,   \
+                   writeable)    \
                                                                               \
   /* Reoptimize code-sequences of calls at runtime, e.g. replace an */        \
   /* indirect call by a direct call.                                */        \
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/aix/os_aix.cpp
--- a/src/hotspot/os/aix/os_aix.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/aix/os_aix.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2017 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -1723,7 +1723,7 @@
   local_sem_post();
 }
 
-static int check_pending_signals(bool wait) {
+static int check_pending_signals() {
   Atomic::store(0, &sigint_count);
   for (;;) {
     for (int i = 0; i < NSIG + 1; i++) {
@@ -1732,9 +1732,6 @@
         return i;
       }
     }
-    if (!wait) {
-      return -1;
-    }
     JavaThread *thread = JavaThread::current();
     ThreadBlockInVM tbivm(thread);
 
@@ -1763,12 +1760,8 @@
   }
 }
 
-int os::signal_lookup() {
-  return check_pending_signals(false);
-}
-
 int os::signal_wait() {
-  return check_pending_signals(true);
+  return check_pending_signals();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/bsd/os_bsd.cpp
--- a/src/hotspot/os/bsd/os_bsd.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/bsd/os_bsd.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -52,13 +52,13 @@
 #include "runtime/orderAccess.inline.hpp"
 #include "runtime/osThread.hpp"
 #include "runtime/perfMemory.hpp"
+#include "runtime/semaphore.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/statSampler.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "runtime/thread.inline.hpp"
 #include "runtime/threadCritical.hpp"
 #include "runtime/timer.hpp"
-#include "semaphore_bsd.hpp"
 #include "services/attachListener.hpp"
 #include "services/memTracker.hpp"
 #include "services/runtimeService.hpp"
@@ -91,7 +91,6 @@
 # include <time.h>
 # include <pwd.h>
 # include <poll.h>
-# include <semaphore.h>
 # include <fcntl.h>
 # include <string.h>
 # include <sys/param.h>
@@ -1829,135 +1828,28 @@
 
 // a counter for each possible signal value
 static volatile jint pending_signals[NSIG+1] = { 0 };
-
-// Bsd(POSIX) specific hand shaking semaphore.
-#ifdef __APPLE__
-typedef semaphore_t os_semaphore_t;
-
-  #define SEM_INIT(sem, value)    semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
-  #define SEM_WAIT(sem)           semaphore_wait(sem)
-  #define SEM_POST(sem)           semaphore_signal(sem)
-  #define SEM_DESTROY(sem)        semaphore_destroy(mach_task_self(), sem)
-#else
-typedef sem_t os_semaphore_t;
-
-  #define SEM_INIT(sem, value)    sem_init(&sem, 0, value)
-  #define SEM_WAIT(sem)           sem_wait(&sem)
-  #define SEM_POST(sem)           sem_post(&sem)
-  #define SEM_DESTROY(sem)        sem_destroy(&sem)
-#endif
-
-#ifdef __APPLE__
-// OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
-
-static const char* sem_init_strerror(kern_return_t value) {
-  switch (value) {
-    case KERN_INVALID_ARGUMENT:  return "Invalid argument";
-    case KERN_RESOURCE_SHORTAGE: return "Resource shortage";
-    default:                     return "Unknown";
-  }
-}
-
-OSXSemaphore::OSXSemaphore(uint value) {
-  kern_return_t ret = SEM_INIT(_semaphore, value);
-
-  guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret));
-}
-
-OSXSemaphore::~OSXSemaphore() {
-  SEM_DESTROY(_semaphore);
-}
-
-void OSXSemaphore::signal(uint count) {
-  for (uint i = 0; i < count; i++) {
-    kern_return_t ret = SEM_POST(_semaphore);
-
-    assert(ret == KERN_SUCCESS, "Failed to signal semaphore");
-  }
-}
-
-void OSXSemaphore::wait() {
-  kern_return_t ret;
-  while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) {
-    // Semaphore was interrupted. Retry.
-  }
-  assert(ret == KERN_SUCCESS, "Failed to wait on semaphore");
-}
-
-jlong OSXSemaphore::currenttime() {
-  struct timeval tv;
-  gettimeofday(&tv, NULL);
-  return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
-}
-
-bool OSXSemaphore::trywait() {
-  return timedwait(0, 0);
-}
-
-bool OSXSemaphore::timedwait(unsigned int sec, int nsec) {
-  kern_return_t kr = KERN_ABORTED;
-  mach_timespec_t waitspec;
-  waitspec.tv_sec = sec;
-  waitspec.tv_nsec = nsec;
-
-  jlong starttime = currenttime();
-
-  kr = semaphore_timedwait(_semaphore, waitspec);
-  while (kr == KERN_ABORTED) {
-    jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
-
-    jlong current = currenttime();
-    jlong passedtime = current - starttime;
-
-    if (passedtime >= totalwait) {
-      waitspec.tv_sec = 0;
-      waitspec.tv_nsec = 0;
-    } else {
-      jlong waittime = totalwait - (current - starttime);
-      waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
-      waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
-    }
-
-    kr = semaphore_timedwait(_semaphore, waitspec);
-  }
-
-  return kr == KERN_SUCCESS;
-}
-
-#else
-// Use POSIX implementation of semaphores.
-
-struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
-  struct timespec ts;
-  unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
-
-  return ts;
-}
-
-#endif // __APPLE__
-
-static os_semaphore_t sig_sem;
-
-#ifdef __APPLE__
-static OSXSemaphore sr_semaphore;
-#else
-static PosixSemaphore sr_semaphore;
-#endif
+static Semaphore* sig_sem = NULL;
 
 void os::signal_init_pd() {
   // Initialize signal structures
   ::memset((void*)pending_signals, 0, sizeof(pending_signals));
 
   // Initialize signal semaphore
-  ::SEM_INIT(sig_sem, 0);
+  sig_sem = new Semaphore();
 }
 
 void os::signal_notify(int sig) {
-  Atomic::inc(&pending_signals[sig]);
-  ::SEM_POST(sig_sem);
+  if (sig_sem != NULL) {
+    Atomic::inc(&pending_signals[sig]);
+    sig_sem->signal();
+  } else {
+    // Signal thread is not created with ReduceSignalUsage and signal_init_pd
+    // initialization isn't called.
+    assert(ReduceSignalUsage, "signal semaphore should be created");
+  }
 }
 
-static int check_pending_signals(bool wait) {
+static int check_pending_signals() {
   Atomic::store(0, &sigint_count);
   for (;;) {
     for (int i = 0; i < NSIG + 1; i++) {
@@ -1966,9 +1858,6 @@
         return i;
       }
     }
-    if (!wait) {
-      return -1;
-    }
     JavaThread *thread = JavaThread::current();
     ThreadBlockInVM tbivm(thread);
 
@@ -1976,7 +1865,7 @@
     do {
       thread->set_suspend_equivalent();
       // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
-      ::SEM_WAIT(sig_sem);
+      sig_sem->wait();
 
       // were we externally suspended while we were waiting?
       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
@@ -1985,7 +1874,7 @@
         // another thread suspended us. We don't want to continue running
         // while suspended because that would surprise the thread that
         // suspended us.
-        ::SEM_POST(sig_sem);
+        sig_sem->signal();
 
         thread->java_suspend_self();
       }
@@ -1993,12 +1882,8 @@
   }
 }
 
-int os::signal_lookup() {
-  return check_pending_signals(false);
-}
-
 int os::signal_wait() {
-  return check_pending_signals(true);
+  return check_pending_signals();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -2663,6 +2548,12 @@
 //
 // Currently only ever called on the VMThread or JavaThread
 //
+#ifdef __APPLE__
+static OSXSemaphore sr_semaphore;
+#else
+static PosixSemaphore sr_semaphore;
+#endif
+
 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
   // Save and restore errno to avoid confusing native code with EINTR
   // after sigsuspend.
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/bsd/semaphore_bsd.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/bsd/semaphore_bsd.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled/precompiled.hpp"
+#include "semaphore_bsd.hpp"
+#include "utilities/debug.hpp"
+
+#include <semaphore.h>
+
+#ifdef __APPLE__
+// OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
+
+static const char* sem_init_strerror(kern_return_t value) {
+  switch (value) {
+    case KERN_INVALID_ARGUMENT:  return "Invalid argument";
+    case KERN_RESOURCE_SHORTAGE: return "Resource shortage";
+    default:                     return "Unknown";
+  }
+}
+
+OSXSemaphore::OSXSemaphore(uint value) {
+  kern_return_t ret = semaphore_create(mach_task_self(), &_semaphore, SYNC_POLICY_FIFO, value);
+
+  guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret));
+}
+
+OSXSemaphore::~OSXSemaphore() {
+  semaphore_destroy(mach_task_self(), _semaphore);
+}
+
+void OSXSemaphore::signal(uint count) {
+  for (uint i = 0; i < count; i++) {
+    kern_return_t ret = semaphore_signal(_semaphore);
+
+    assert(ret == KERN_SUCCESS, "Failed to signal semaphore");
+  }
+}
+
+void OSXSemaphore::wait() {
+  kern_return_t ret;
+  while ((ret = semaphore_wait(_semaphore)) == KERN_ABORTED) {
+    // Semaphore was interrupted. Retry.
+  }
+  assert(ret == KERN_SUCCESS, "Failed to wait on semaphore");
+}
+
+int64_t OSXSemaphore::currenttime() {
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
+}
+
+bool OSXSemaphore::trywait() {
+  return timedwait(0, 0);
+}
+
+bool OSXSemaphore::timedwait(unsigned int sec, int nsec) {
+  kern_return_t kr = KERN_ABORTED;
+  mach_timespec_t waitspec;
+  waitspec.tv_sec = sec;
+  waitspec.tv_nsec = nsec;
+
+  int64_t starttime = currenttime();
+
+  kr = semaphore_timedwait(_semaphore, waitspec);
+  while (kr == KERN_ABORTED) {
+    int64_t totalwait = (sec * NANOSECS_PER_SEC) + nsec;
+
+    int64_t current = currenttime();
+    int64_t passedtime = current - starttime;
+
+    if (passedtime >= totalwait) {
+      waitspec.tv_sec = 0;
+      waitspec.tv_nsec = 0;
+    } else {
+      int64_t waittime = totalwait - (current - starttime);
+      waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
+      waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
+    }
+
+    kr = semaphore_timedwait(_semaphore, waitspec);
+  }
+
+  return kr == KERN_SUCCESS;
+}
+#endif // __APPLE__
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/bsd/semaphore_bsd.hpp
--- a/src/hotspot/os/bsd/semaphore_bsd.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/bsd/semaphore_bsd.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -53,7 +53,7 @@
   bool timedwait(unsigned int sec, int nsec);
 
  private:
-  static jlong currenttime();
+  static int64_t currenttime();
 };
 
 typedef OSXSemaphore SemaphoreImpl;
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/linux/os_linux.cpp
--- a/src/hotspot/os/linux/os_linux.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/linux/os_linux.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -95,7 +95,6 @@
 # include <sys/wait.h>
 # include <pwd.h>
 # include <poll.h>
-# include <semaphore.h>
 # include <fcntl.h>
 # include <string.h>
 # include <syscall.h>
@@ -2479,11 +2478,11 @@
   return CAST_FROM_FN_PTR(void*, UserHandler);
 }
 
-struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
+static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) {
   struct timespec ts;
   // Semaphore's are always associated with CLOCK_REALTIME
   os::Linux::clock_gettime(CLOCK_REALTIME, &ts);
-  // see unpackTime for discussion on overflow checking
+  // see os_posix.cpp for discussion on overflow checking
   if (sec >= MAX_SECS) {
     ts.tv_sec += MAX_SECS;
     ts.tv_nsec = 0;
@@ -2535,7 +2534,7 @@
 static volatile jint pending_signals[NSIG+1] = { 0 };
 
 // Linux(POSIX) specific hand shaking semaphore.
-static sem_t sig_sem;
+static Semaphore* sig_sem = NULL;
 static PosixSemaphore sr_semaphore;
 
 void os::signal_init_pd() {
@@ -2543,15 +2542,21 @@
   ::memset((void*)pending_signals, 0, sizeof(pending_signals));
 
   // Initialize signal semaphore
-  ::sem_init(&sig_sem, 0, 0);
+  sig_sem = new Semaphore();
 }
 
 void os::signal_notify(int sig) {
-  Atomic::inc(&pending_signals[sig]);
-  ::sem_post(&sig_sem);
-}
-
-static int check_pending_signals(bool wait) {
+  if (sig_sem != NULL) {
+    Atomic::inc(&pending_signals[sig]);
+    sig_sem->signal();
+  } else {
+    // Signal thread is not created with ReduceSignalUsage and signal_init_pd
+    // initialization isn't called.
+    assert(ReduceSignalUsage, "signal semaphore should be created");
+  }
+}
+
+static int check_pending_signals() {
   Atomic::store(0, &sigint_count);
   for (;;) {
     for (int i = 0; i < NSIG + 1; i++) {
@@ -2560,9 +2565,6 @@
         return i;
       }
     }
-    if (!wait) {
-      return -1;
-    }
     JavaThread *thread = JavaThread::current();
     ThreadBlockInVM tbivm(thread);
 
@@ -2570,7 +2572,7 @@
     do {
       thread->set_suspend_equivalent();
       // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
-      ::sem_wait(&sig_sem);
+      sig_sem->wait();
 
       // were we externally suspended while we were waiting?
       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
@@ -2579,7 +2581,7 @@
         // another thread suspended us. We don't want to continue running
         // while suspended because that would surprise the thread that
         // suspended us.
-        ::sem_post(&sig_sem);
+        sig_sem->signal();
 
         thread->java_suspend_self();
       }
@@ -2587,12 +2589,8 @@
   }
 }
 
-int os::signal_lookup() {
-  return check_pending_signals(false);
-}
-
 int os::signal_wait() {
-  return check_pending_signals(true);
+  return check_pending_signals();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -4317,7 +4315,7 @@
 
   // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
   while (true) {
-    if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
+    if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
       break;
     } else {
       // timeout
@@ -4351,7 +4349,7 @@
 
   while (true) {
     if (sr_notify(osthread) == 0) {
-      if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
+      if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
         if (osthread->sr.is_running()) {
           return;
         }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/posix/os_posix.cpp
--- a/src/hotspot/os/posix/os_posix.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/posix/os_posix.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,14 +31,8 @@
 #include "utilities/macros.hpp"
 #include "utilities/vmError.hpp"
 
-#ifndef __APPLE__
-// POSIX unamed semaphores are not supported on OS X.
-#include "semaphore_posix.hpp"
-#endif
-
 #include <dlfcn.h>
 #include <pthread.h>
-#include <semaphore.h>
 #include <signal.h>
 #include <sys/mman.h>
 #include <sys/resource.h>
@@ -1499,67 +1493,6 @@
   }
 }
 
-// POSIX unamed semaphores are not supported on OS X.
-#ifndef __APPLE__
-
-PosixSemaphore::PosixSemaphore(uint value) {
-  int ret = sem_init(&_semaphore, 0, value);
-
-  guarantee_with_errno(ret == 0, "Failed to initialize semaphore");
-}
-
-PosixSemaphore::~PosixSemaphore() {
-  sem_destroy(&_semaphore);
-}
-
-void PosixSemaphore::signal(uint count) {
-  for (uint i = 0; i < count; i++) {
-    int ret = sem_post(&_semaphore);
-
-    assert_with_errno(ret == 0, "sem_post failed");
-  }
-}
-
-void PosixSemaphore::wait() {
-  int ret;
-
-  do {
-    ret = sem_wait(&_semaphore);
-  } while (ret != 0 && errno == EINTR);
-
-  assert_with_errno(ret == 0, "sem_wait failed");
-}
-
-bool PosixSemaphore::trywait() {
-  int ret;
-
-  do {
-    ret = sem_trywait(&_semaphore);
-  } while (ret != 0 && errno == EINTR);
-
-  assert_with_errno(ret == 0 || errno == EAGAIN, "trywait failed");
-
-  return ret == 0;
-}
-
-bool PosixSemaphore::timedwait(struct timespec ts) {
-  while (true) {
-    int result = sem_timedwait(&_semaphore, &ts);
-    if (result == 0) {
-      return true;
-    } else if (errno == EINTR) {
-      continue;
-    } else if (errno == ETIMEDOUT) {
-      return false;
-    } else {
-      assert_with_errno(false, "timedwait failed");
-      return false;
-    }
-  }
-}
-
-#endif // __APPLE__
-
 
 // Shared pthread_mutex/cond based PlatformEvent implementation.
 // Not currently usable by Solaris.
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/posix/semaphore_posix.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/posix/semaphore_posix.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled/precompiled.hpp"
+#ifndef __APPLE__
+#include "runtime/os.hpp"
+// POSIX unamed semaphores are not supported on OS X.
+#include "semaphore_posix.hpp"
+#include <semaphore.h>
+
+#define check_with_errno(check_type, cond, msg)                             \
+  do {                                                                      \
+    int err = errno;                                                        \
+    check_type(cond, "%s; error='%s' (errno=%s)", msg, os::strerror(err),   \
+               os::errno_name(err));                                        \
+} while (false)
+
+#define assert_with_errno(cond, msg)    check_with_errno(assert, cond, msg)
+#define guarantee_with_errno(cond, msg) check_with_errno(guarantee, cond, msg)
+
+PosixSemaphore::PosixSemaphore(uint value) {
+  int ret = sem_init(&_semaphore, 0, value);
+
+  guarantee_with_errno(ret == 0, "Failed to initialize semaphore");
+}
+
+PosixSemaphore::~PosixSemaphore() {
+  sem_destroy(&_semaphore);
+}
+
+void PosixSemaphore::signal(uint count) {
+  for (uint i = 0; i < count; i++) {
+    int ret = sem_post(&_semaphore);
+
+    assert_with_errno(ret == 0, "sem_post failed");
+  }
+}
+
+void PosixSemaphore::wait() {
+  int ret;
+
+  do {
+    ret = sem_wait(&_semaphore);
+  } while (ret != 0 && errno == EINTR);
+
+  assert_with_errno(ret == 0, "sem_wait failed");
+}
+
+bool PosixSemaphore::trywait() {
+  int ret;
+
+  do {
+    ret = sem_trywait(&_semaphore);
+  } while (ret != 0 && errno == EINTR);
+
+  assert_with_errno(ret == 0 || errno == EAGAIN, "trywait failed");
+
+  return ret == 0;
+}
+
+bool PosixSemaphore::timedwait(struct timespec ts) {
+  while (true) {
+    int result = sem_timedwait(&_semaphore, &ts);
+    if (result == 0) {
+      return true;
+    } else if (errno == EINTR) {
+      continue;
+    } else if (errno == ETIMEDOUT) {
+      return false;
+    } else {
+      assert_with_errno(false, "timedwait failed");
+      return false;
+    }
+  }
+}
+#endif // __APPLE__
+
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/posix/semaphore_posix.hpp
--- a/src/hotspot/os/posix/semaphore_posix.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/posix/semaphore_posix.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -45,15 +45,7 @@
   void wait();
 
   bool trywait();
-  bool timedwait(unsigned int sec, int nsec) {
-    return timedwait(create_timespec(sec, nsec));
-  }
-
- private:
   bool timedwait(struct timespec ts);
-
-  // OS specific implementation to create a timespec suitable for semaphores.
-  struct timespec create_timespec(unsigned int set, int nsec);
 };
 
 typedef PosixSemaphore SemaphoreImpl;
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/solaris/os_solaris.cpp
--- a/src/hotspot/os/solaris/os_solaris.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/solaris/os_solaris.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2062,7 +2062,7 @@
   return CAST_FROM_FN_PTR(void*, UserHandler);
 }
 
-struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
+static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) {
   struct timespec ts;
   unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
 
@@ -2100,7 +2100,7 @@
 static jint *pending_signals = NULL;
 static int *preinstalled_sigs = NULL;
 static struct sigaction *chainedsigactions = NULL;
-static sema_t sig_sem;
+static Semaphore* sig_sem = NULL;
 typedef int (*version_getting_t)();
 version_getting_t os::Solaris::get_libjsig_version = NULL;
 
@@ -2115,6 +2115,7 @@
   Sigexit = Maxsignum+1;
   assert(Maxsignum >0, "Unable to obtain max signal number");
 
+  // Initialize signal structures
   // pending_signals has one int per signal
   // The additional signal is for SIGEXIT - exit signal to signal_thread
   pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
@@ -2132,21 +2133,22 @@
 }
 
 void os::signal_init_pd() {
-  int ret;
-
-  ret = ::sema_init(&sig_sem, 0, NULL, NULL);
-  assert(ret == 0, "sema_init() failed");
-}
-
-void os::signal_notify(int signal_number) {
-  int ret;
-
-  Atomic::inc(&pending_signals[signal_number]);
-  ret = ::sema_post(&sig_sem);
-  assert(ret == 0, "sema_post() failed");
-}
-
-static int check_pending_signals(bool wait_for_signal) {
+  // Initialize signal semaphore
+  sig_sem = new Semaphore();
+}
+
+void os::signal_notify(int sig) {
+  if (sig_sem != NULL) {
+    Atomic::inc(&pending_signals[sig]);
+    sig_sem->signal();
+  } else {
+    // Signal thread is not created with ReduceSignalUsage and signal_init_pd
+    // initialization isn't called.
+    assert(ReduceSignalUsage, "signal semaphore should be created");
+  }
+}
+
+static int check_pending_signals() {
   int ret;
   while (true) {
     for (int i = 0; i < Sigexit + 1; i++) {
@@ -2155,19 +2157,13 @@
         return i;
       }
     }
-    if (!wait_for_signal) {
-      return -1;
-    }
     JavaThread *thread = JavaThread::current();
     ThreadBlockInVM tbivm(thread);
 
     bool threadIsSuspended;
     do {
       thread->set_suspend_equivalent();
-      // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
-      while ((ret = ::sema_wait(&sig_sem)) == EINTR)
-        ;
-      assert(ret == 0, "sema_wait() failed");
+      sig_sem->wait();
 
       // were we externally suspended while we were waiting?
       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
@@ -2176,8 +2172,7 @@
         // another thread suspended us. We don't want to continue running
         // while suspended because that would surprise the thread that
         // suspended us.
-        ret = ::sema_post(&sig_sem);
-        assert(ret == 0, "sema_post() failed");
+        sig_sem->signal();
 
         thread->java_suspend_self();
       }
@@ -2185,12 +2180,8 @@
   }
 }
 
-int os::signal_lookup() {
-  return check_pending_signals(false);
-}
-
 int os::signal_wait() {
-  return check_pending_signals(true);
+  return check_pending_signals();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -3599,7 +3590,7 @@
 
   // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
   while (true) {
-    if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
+    if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2000 * NANOSECS_PER_MILLISEC))) {
       break;
     } else {
       // timeout
@@ -3633,7 +3624,7 @@
 
   while (true) {
     if (sr_notify(osthread) == 0) {
-      if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
+      if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
         if (osthread->sr.is_running()) {
           return;
         }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/windows/os_windows.cpp
--- a/src/hotspot/os/windows/os_windows.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/os/windows/os_windows.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -62,7 +62,6 @@
 #include "runtime/threadCritical.hpp"
 #include "runtime/timer.hpp"
 #include "runtime/vm_version.hpp"
-#include "semaphore_windows.hpp"
 #include "services/attachListener.hpp"
 #include "services/memTracker.hpp"
 #include "services/runtimeService.hpp"
@@ -1845,36 +1844,6 @@
   return (int)error;
 }
 
-WindowsSemaphore::WindowsSemaphore(uint value) {
-  _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
-
-  guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
-}
-
-WindowsSemaphore::~WindowsSemaphore() {
-  ::CloseHandle(_semaphore);
-}
-
-void WindowsSemaphore::signal(uint count) {
-  if (count > 0) {
-    BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
-
-    assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
-  }
-}
-
-void WindowsSemaphore::wait() {
-  DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
-  assert(ret != WAIT_FAILED,   "WaitForSingleObject failed with error code: %lu", GetLastError());
-  assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
-}
-
-bool WindowsSemaphore::trywait() {
-  DWORD ret = ::WaitForSingleObject(_semaphore, 0);
-  assert(ret != WAIT_FAILED,   "WaitForSingleObject failed with error code: %lu", GetLastError());
-  return ret == WAIT_OBJECT_0;
-}
-
 // sun.misc.Signal
 // NOTE that this is a workaround for an apparent kernel bug where if
 // a signal handler for SIGBREAK is installed then that signal handler
@@ -1966,13 +1935,14 @@
 
 // a counter for each possible signal value, including signal_thread exit signal
 static volatile jint pending_signals[NSIG+1] = { 0 };
-static HANDLE sig_sem = NULL;
+static Semaphore* sig_sem = NULL;
 
 void os::signal_init_pd() {
   // Initialize signal structures
   memset((void*)pending_signals, 0, sizeof(pending_signals));
 
-  sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
+  // Initialize signal semaphore
+  sig_sem = new Semaphore();
 
   // Programs embedding the VM do not want it to attempt to receive
   // events like CTRL_LOGOFF_EVENT, which are used to implement the
@@ -1994,17 +1964,18 @@
   }
 }
 
-void os::signal_notify(int signal_number) {
-  BOOL ret;
+void os::signal_notify(int sig) {
   if (sig_sem != NULL) {
-    Atomic::inc(&pending_signals[signal_number]);
-    ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
-    assert(ret != 0, "ReleaseSemaphore() failed");
-  }
-}
-
-static int check_pending_signals(bool wait_for_signal) {
-  DWORD ret;
+    Atomic::inc(&pending_signals[sig]);
+    sig_sem->signal();
+  } else {
+    // Signal thread is not created with ReduceSignalUsage and signal_init_pd
+    // initialization isn't called.
+    assert(ReduceSignalUsage, "signal semaphore should be created");
+  }
+}
+
+static int check_pending_signals() {
   while (true) {
     for (int i = 0; i < NSIG + 1; i++) {
       jint n = pending_signals[i];
@@ -2012,10 +1983,6 @@
         return i;
       }
     }
-    if (!wait_for_signal) {
-      return -1;
-    }
-
     JavaThread *thread = JavaThread::current();
 
     ThreadBlockInVM tbivm(thread);
@@ -2024,8 +1991,7 @@
     do {
       thread->set_suspend_equivalent();
       // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
-      ret = ::WaitForSingleObject(sig_sem, INFINITE);
-      assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
+      sig_sem->wait();
 
       // were we externally suspended while we were waiting?
       threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
@@ -2034,8 +2000,7 @@
         // another thread suspended us. We don't want to continue running
         // while suspended because that would surprise the thread that
         // suspended us.
-        ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
-        assert(ret != 0, "ReleaseSemaphore() failed");
+        sig_sem->signal();
 
         thread->java_suspend_self();
       }
@@ -2043,12 +2008,8 @@
   }
 }
 
-int os::signal_lookup() {
-  return check_pending_signals(false);
-}
-
 int os::signal_wait() {
-  return check_pending_signals(true);
+  return check_pending_signals();
 }
 
 // Implicit OS exception handling
@@ -4394,13 +4355,49 @@
 
 // Is a (classpath) directory empty?
 bool os::dir_is_empty(const char* path) {
-  WIN32_FIND_DATA fd;
-  HANDLE f = FindFirstFile(path, &fd);
-  if (f == INVALID_HANDLE_VALUE) {
-    return true;
-  }
-  FindClose(f);
-  return false;
+  char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal);
+  if (search_path == NULL) {
+    errno = ENOMEM;
+    return false;
+  }
+  strcpy(search_path, path);
+  // Append "*", or possibly "\\*", to path
+  if (path[1] == ':' &&
+    (path[2] == '\0' ||
+    (path[2] == '\\' && path[3] == '\0'))) {
+    // No '\\' needed for cases like "Z:" or "Z:\"
+    strcat(search_path, "*");
+  }
+  else {
+    strcat(search_path, "\\*");
+  }
+  errno_t err = ERROR_SUCCESS;
+  wchar_t* wpath = create_unc_path(search_path, err);
+  if (err != ERROR_SUCCESS) {
+    if (wpath != NULL) {
+      destroy_unc_path(wpath);
+    }
+    os::free(search_path);
+    errno = err;
+    return false;
+  }
+  WIN32_FIND_DATAW fd;
+  HANDLE f = ::FindFirstFileW(wpath, &fd);
+  destroy_unc_path(wpath);
+  bool is_empty = true;
+  if (f != INVALID_HANDLE_VALUE) {
+    while (is_empty && ::FindNextFileW(f, &fd)) {
+      // An empty directory contains only the current directory file
+      // and the previous directory file.
+      if ((wcscmp(fd.cFileName, L".") != 0) &&
+          (wcscmp(fd.cFileName, L"..") != 0)) {
+        is_empty = false;
+      }
+    }
+    FindClose(f);
+  }
+  os::free(search_path);
+  return is_empty;
 }
 
 // create binary file, rewriting existing file if required
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/os/windows/semaphore_windows.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/windows/semaphore_windows.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "semaphore_windows.hpp"
+#include "utilities/debug.hpp"
+
+#include <windows.h>
+#include <errno.h>
+
+WindowsSemaphore::WindowsSemaphore(uint value) {
+  _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
+
+  guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
+}
+
+WindowsSemaphore::~WindowsSemaphore() {
+  ::CloseHandle(_semaphore);
+}
+
+void WindowsSemaphore::signal(uint count) {
+  if (count > 0) {
+    BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
+
+    assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
+  }
+}
+
+void WindowsSemaphore::wait() {
+  DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
+  assert(ret != WAIT_FAILED,   "WaitForSingleObject failed with error code: %lu", GetLastError());
+  assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
+}
+
+bool WindowsSemaphore::trywait() {
+  DWORD ret = ::WaitForSingleObject(_semaphore, 0);
+  assert(ret != WAIT_FAILED,   "WaitForSingleObject failed with error code: %lu", GetLastError());
+  return ret == WAIT_OBJECT_0;
+}
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/ci/ciInstanceKlass.cpp
--- a/src/hotspot/share/ci/ciInstanceKlass.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/ci/ciInstanceKlass.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -34,35 +34,12 @@
 #include "oops/oop.inline.hpp"
 #include "oops/fieldStreams.hpp"
 #include "runtime/fieldDescriptor.hpp"
-#if INCLUDE_ALL_GCS
-# include "gc/g1/g1SATBCardTableModRefBS.hpp"
-#endif
 
 // ciInstanceKlass
 //
 // This class represents a Klass* in the HotSpot virtual machine
 // whose Klass part in an InstanceKlass.
 
-// ------------------------------------------------------------------
-// ensure_metadata_alive
-//
-// Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
-// This is primarily useful for metadata which is considered as weak roots
-// by the GC but need to be strong roots if reachable from a current compilation.
-// InstanceKlass are created for both weak and strong metadata.  Ensuring this metadata
-// alive covers the cases where there are weak roots without performance cost.
-//
-static void ensure_metadata_alive(oop metadata_holder) {
-#if INCLUDE_ALL_GCS
-  if (!UseG1GC) {
-    return;
-  }
-  if (metadata_holder != NULL) {
-    G1SATBCardTableModRefBS::enqueue(metadata_holder);
-  }
-#endif
-}
-
 
 // ------------------------------------------------------------------
 // ciInstanceKlass::ciInstanceKlass
@@ -88,8 +65,12 @@
   _has_injected_fields = -1;
   _implementor = NULL; // we will fill these lazily
 
-  oop holder = ik->klass_holder();
-  ensure_metadata_alive(holder);
+  // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
+  // This is primarily useful for metadata which is considered as weak roots
+  // by the GC but need to be strong roots if reachable from a current compilation.
+  // InstanceKlass are created for both weak and strong metadata.  Ensuring this metadata
+  // alive covers the cases where there are weak roots without performance cost.
+  oop holder = ik->klass_holder_phantom();
   if (ik->is_anonymous()) {
     // Though ciInstanceKlass records class loader oop, it's not enough to keep
     // VM anonymous classes alive (loader == NULL). Klass holder should be used instead.
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/classLoaderData.cpp
--- a/src/hotspot/share/classfile/classLoaderData.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/classLoaderData.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -63,6 +63,7 @@
 #include "memory/metaspaceShared.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/resourceArea.hpp"
+#include "oops/access.inline.hpp"
 #include "oops/objArrayOop.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/atomic.hpp"
@@ -75,9 +76,6 @@
 #include "utilities/growableArray.hpp"
 #include "utilities/macros.hpp"
 #include "utilities/ostream.hpp"
-#if INCLUDE_ALL_GCS
-#include "gc/g1/g1SATBCardTableModRefBS.hpp"
-#endif // INCLUDE_ALL_GCS
 #if INCLUDE_TRACE
 #include "trace/tracing.hpp"
 #endif
@@ -759,18 +757,9 @@
   oop* ptr = h.ptr_raw();
   if (ptr != NULL) {
     assert(_handles.contains(ptr), "Got unexpected handle " PTR_FORMAT, p2i(ptr));
-#if INCLUDE_ALL_GCS
-    // This barrier is used by G1 to remember the old oop values, so
-    // that we don't forget any objects that were live at the snapshot at
-    // the beginning.
-    if (UseG1GC) {
-      oop obj = *ptr;
-      if (obj != NULL) {
-        G1SATBCardTableModRefBS::enqueue(obj);
-      }
-    }
-#endif
-    *ptr = NULL;
+    // This root is not walked in safepoints, and hence requires an appropriate
+    // decorator that e.g. maintains the SATB invariant in SATB collectors.
+    RootAccess<IN_CONCURRENT_ROOT>::oop_store(ptr, oop(NULL));
   }
 }
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/classLoaderData.hpp
--- a/src/hotspot/share/classfile/classLoaderData.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/classLoaderData.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -217,6 +217,7 @@
   friend class ClassLoaderDataGraphKlassIteratorAtomic;
   friend class ClassLoaderDataGraphKlassIteratorStatic;
   friend class ClassLoaderDataGraphMetaspaceIterator;
+  friend class InstanceKlass;
   friend class MetaDataFactory;
   friend class Method;
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/javaClasses.cpp
--- a/src/hotspot/share/classfile/javaClasses.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/javaClasses.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,6 +33,8 @@
 #include "code/dependencyContext.hpp"
 #include "code/pcDesc.hpp"
 #include "interpreter/interpreter.hpp"
+#include "logging/log.hpp"
+#include "logging/logStream.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.inline.hpp"
@@ -104,52 +106,59 @@
 }
 
 
-static bool find_field(InstanceKlass* ik,
-                       Symbol* name_symbol, Symbol* signature_symbol,
-                       fieldDescriptor* fd,
-                       bool is_static = false, bool allow_super = false) {
-  if (allow_super || is_static) {
-    return ik->find_field(name_symbol, signature_symbol, is_static, fd) != NULL;
-  } else {
-    return ik->find_local_field(name_symbol, signature_symbol, fd);
+// Helpful routine for computing field offsets at run time rather than hardcoding them
+// Finds local fields only, including static fields.  Static field offsets are from the
+// beginning of the mirror.
+static void compute_offset(int &dest_offset,
+                           InstanceKlass* ik, Symbol* name_symbol, Symbol* signature_symbol,
+                           bool is_static = false) {
+  fieldDescriptor fd;
+  if (ik == NULL) {
+    ResourceMark rm;
+    log_error(class)("Mismatch JDK version for field: %s type: %s", name_symbol->as_C_string(), signature_symbol->as_C_string());
+    vm_exit_during_initialization("Invalid layout of preloaded class");
   }
-}
-
-// Helpful routine for computing field offsets at run time rather than hardcoding them
-static void
-compute_offset(int &dest_offset,
-               Klass* klass, Symbol* name_symbol, Symbol* signature_symbol,
-               bool is_static = false, bool allow_super = false) {
-  fieldDescriptor fd;
-  InstanceKlass* ik = InstanceKlass::cast(klass);
-  if (!find_field(ik, name_symbol, signature_symbol, &fd, is_static, allow_super)) {
+
+  if (!ik->find_local_field(name_symbol, signature_symbol, &fd) || fd.is_static() != is_static) {
     ResourceMark rm;
-    tty->print_cr("Invalid layout of %s at %s", ik->external_name(), name_symbol->as_C_string());
+    log_error(class)("Invalid layout of %s field: %s type: %s", ik->external_name(),
+                     name_symbol->as_C_string(), signature_symbol->as_C_string());
 #ifndef PRODUCT
-    ik->print();
-    tty->print_cr("all fields:");
-    for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
-      tty->print_cr("  name: %s, sig: %s, flags: %08x", fs.name()->as_C_string(), fs.signature()->as_C_string(), fs.access_flags().as_int());
-    }
+    // Prints all fields and offsets
+    Log(class) lt;
+    LogStream ls(lt.error());
+    ik->print_on(&ls);
 #endif //PRODUCT
     vm_exit_during_initialization("Invalid layout of preloaded class: use -Xlog:class+load=info to see the origin of the problem class");
   }
   dest_offset = fd.offset();
 }
 
+// Overloading to pass name as a string.
+static void compute_offset(int& dest_offset, InstanceKlass* ik,
+                           const char* name_string, Symbol* signature_symbol,
+                           bool is_static = false) {
+  TempNewSymbol name = SymbolTable::probe(name_string, (int)strlen(name_string));
+  if (name == NULL) {
+    ResourceMark rm;
+    log_error(class)("Name %s should be in the SymbolTable since its class is loaded", name_string);
+    vm_exit_during_initialization("Invalid layout of preloaded class", ik->external_name());
+  }
+  compute_offset(dest_offset, ik, name, signature_symbol, is_static);
+}
+
 // Same as above but for "optional" offsets that might not be present in certain JDK versions
+// Old versions should be cleaned out since Hotspot only supports the current JDK, and this
+// function should be removed.
 static void
 compute_optional_offset(int& dest_offset,
-                        Klass* klass, Symbol* name_symbol, Symbol* signature_symbol,
-                        bool allow_super = false) {
+                        InstanceKlass* ik, Symbol* name_symbol, Symbol* signature_symbol) {
   fieldDescriptor fd;
-  InstanceKlass* ik = InstanceKlass::cast(klass);
-  if (find_field(ik, name_symbol, signature_symbol, &fd, allow_super)) {
+  if (ik->find_local_field(name_symbol, signature_symbol, &fd)) {
     dest_offset = fd.offset();
   }
 }
 
-
 int java_lang_String::value_offset  = 0;
 int java_lang_String::hash_offset   = 0;
 int java_lang_String::coder_offset  = 0;
@@ -163,10 +172,10 @@
 void java_lang_String::compute_offsets() {
   assert(!initialized, "offsets should be initialized only once");
 
-  Klass* k = SystemDictionary::String_klass();
+  InstanceKlass* k = SystemDictionary::String_klass();
   compute_offset(value_offset,           k, vmSymbols::value_name(),  vmSymbols::byte_array_signature());
-  compute_offset(hash_offset,            k, vmSymbols::hash_name(),   vmSymbols::int_signature());
-  compute_offset(coder_offset,           k, vmSymbols::coder_name(),  vmSymbols::byte_signature());
+  compute_offset(hash_offset,            k, "hash",   vmSymbols::int_signature());
+  compute_offset(coder_offset,           k, "coder",  vmSymbols::byte_signature());
 
   initialized = true;
 }
@@ -619,12 +628,12 @@
 bool java_lang_String::equals(oop java_string, jchar* chars, int len) {
   assert(java_string->klass() == SystemDictionary::String_klass(),
          "must be java_string");
-  typeArrayOop value  = java_lang_String::value(java_string);
-  int          length = java_lang_String::length(java_string);
+  typeArrayOop value = java_lang_String::value_no_keepalive(java_string);
+  int length = java_lang_String::length(java_string);
   if (length != len) {
     return false;
   }
-  bool      is_latin1 = java_lang_String::is_latin1(java_string);
+  bool is_latin1 = java_lang_String::is_latin1(java_string);
   if (!is_latin1) {
     for (int i = 0; i < len; i++) {
       if (value->char_at(i) != chars[i]) {
@@ -646,12 +655,12 @@
          "must be java String");
   assert(str2->klass() == SystemDictionary::String_klass(),
          "must be java String");
-  typeArrayOop value1  = java_lang_String::value(str1);
-  int          length1 = java_lang_String::length(str1);
-  bool       is_latin1 = java_lang_String::is_latin1(str1);
-  typeArrayOop value2  = java_lang_String::value(str2);
-  int          length2 = java_lang_String::length(str2);
-  bool       is_latin2 = java_lang_String::is_latin1(str2);
+  typeArrayOop value1    = java_lang_String::value_no_keepalive(str1);
+  int          length1   = java_lang_String::length(value1);
+  bool         is_latin1 = java_lang_String::is_latin1(str1);
+  typeArrayOop value2    = java_lang_String::value_no_keepalive(str2);
+  int          length2   = java_lang_String::length(value2);
+  bool         is_latin2 = java_lang_String::is_latin1(str2);
 
   if ((length1 != length2) || (is_latin1 != is_latin2)) {
     // Strings of different size or with different
@@ -659,7 +668,7 @@
     return false;
   }
   int blength1 = value1->length();
-  for (int i = 0; i < value1->length(); i++) {
+  for (int i = 0; i < blength1; i++) {
     if (value1->byte_at(i) != value2->byte_at(i)) {
       return false;
     }
@@ -669,7 +678,7 @@
 
 void java_lang_String::print(oop java_string, outputStream* st) {
   assert(java_string->klass() == SystemDictionary::String_klass(), "must be java_string");
-  typeArrayOop value  = java_lang_String::value(java_string);
+  typeArrayOop value  = java_lang_String::value_no_keepalive(java_string);
 
   if (value == NULL) {
     // This can happen if, e.g., printing a String
@@ -1161,25 +1170,11 @@
   assert(!offsets_computed, "offsets should be initialized only once");
   offsets_computed = true;
 
-  Klass* k = SystemDictionary::Class_klass();
-  // The classRedefinedCount field is only present starting in 1.5,
-  // so don't go fatal.
-  compute_optional_offset(classRedefinedCount_offset,
-                          k, vmSymbols::classRedefinedCount_name(), vmSymbols::int_signature());
-
-  // Needs to be optional because the old build runs Queens during bootstrapping
-  // and jdk8-9 doesn't have coordinated pushes yet.
-  compute_optional_offset(_class_loader_offset,
-                 k, vmSymbols::classLoader_name(),
-                 vmSymbols::classloader_signature());
-
-  compute_offset(_component_mirror_offset,
-                 k, vmSymbols::componentType_name(),
-                 vmSymbols::class_signature());
-
-  compute_offset(_module_offset,
-                 k, vmSymbols::module_name(),
-                 vmSymbols::module_signature());
+  InstanceKlass* k = SystemDictionary::Class_klass();
+  compute_offset(classRedefinedCount_offset, k, "classRedefinedCount", vmSymbols::int_signature());
+  compute_offset(_class_loader_offset,       k, "classLoader", vmSymbols::classloader_signature());
+  compute_offset(_component_mirror_offset,   k, "componentType", vmSymbols::class_signature());
+  compute_offset(_module_offset,             k, "module", vmSymbols::module_signature());
 
   // Init lock is a C union with component_mirror.  Only instanceKlass mirrors have
   // init_lock and only ArrayKlass mirrors have component_mirror.  Since both are oops
@@ -1234,24 +1229,22 @@
 void java_lang_Thread::compute_offsets() {
   assert(_group_offset == 0, "offsets should be initialized only once");
 
-  Klass* k = SystemDictionary::Thread_klass();
+  InstanceKlass* k = SystemDictionary::Thread_klass();
   compute_offset(_name_offset,      k, vmSymbols::name_name(),      vmSymbols::string_signature());
   compute_offset(_group_offset,     k, vmSymbols::group_name(),     vmSymbols::threadgroup_signature());
-  compute_offset(_contextClassLoader_offset, k, vmSymbols::contextClassLoader_name(), vmSymbols::classloader_signature());
-  compute_offset(_inheritedAccessControlContext_offset, k, vmSymbols::inheritedAccessControlContext_name(), vmSymbols::accesscontrolcontext_signature());
+  compute_offset(_contextClassLoader_offset, k, vmSymbols::contextClassLoader_name(),
+                 vmSymbols::classloader_signature());
+  compute_offset(_inheritedAccessControlContext_offset, k, vmSymbols::inheritedAccessControlContext_name(),
+                 vmSymbols::accesscontrolcontext_signature());
   compute_offset(_priority_offset,  k, vmSymbols::priority_name(),  vmSymbols::int_signature());
   compute_offset(_daemon_offset,    k, vmSymbols::daemon_name(),    vmSymbols::bool_signature());
-  compute_offset(_eetop_offset,     k, vmSymbols::eetop_name(),     vmSymbols::long_signature());
-  compute_offset(_stillborn_offset, k, vmSymbols::stillborn_name(), vmSymbols::bool_signature());
-  // The stackSize field is only present starting in 1.4, so don't go fatal.
-  compute_optional_offset(_stackSize_offset, k, vmSymbols::stackSize_name(), vmSymbols::long_signature());
-  // The tid and thread_status fields are only present starting in 1.5, so don't go fatal.
-  compute_optional_offset(_tid_offset, k, vmSymbols::thread_id_name(), vmSymbols::long_signature());
-  compute_optional_offset(_thread_status_offset, k, vmSymbols::thread_status_name(), vmSymbols::int_signature());
-  // The parkBlocker field is only present starting in 1.6, so don't go fatal.
-  compute_optional_offset(_park_blocker_offset, k, vmSymbols::park_blocker_name(), vmSymbols::object_signature());
-  compute_optional_offset(_park_event_offset, k, vmSymbols::park_event_name(),
- vmSymbols::long_signature());
+  compute_offset(_eetop_offset,     k, "eetop", vmSymbols::long_signature());
+  compute_offset(_stillborn_offset, k, "stillborn", vmSymbols::bool_signature());
+  compute_offset(_stackSize_offset, k, "stackSize", vmSymbols::long_signature());
+  compute_offset(_tid_offset,       k, "tid", vmSymbols::long_signature());
+  compute_offset(_thread_status_offset, k, "threadStatus", vmSymbols::int_signature());
+  compute_offset(_park_blocker_offset,  k, "parkBlocker", vmSymbols::object_signature());
+  compute_offset(_park_event_offset,    k, "nativeParkEventPointer", vmSymbols::long_signature());
 }
 
 
@@ -1486,7 +1479,7 @@
 void java_lang_ThreadGroup::compute_offsets() {
   assert(_parent_offset == 0, "offsets should be initialized only once");
 
-  Klass* k = SystemDictionary::ThreadGroup_klass();
+  InstanceKlass* k = SystemDictionary::ThreadGroup_klass();
 
   compute_offset(_parent_offset,      k, vmSymbols::parent_name(),      vmSymbols::threadgroup_signature());
   compute_offset(_name_offset,        k, vmSymbols::name_name(),        vmSymbols::string_signature());
@@ -1501,8 +1494,13 @@
 
 
 void java_lang_Throwable::compute_offsets() {
-  Klass* k = SystemDictionary::Throwable_klass();
-  compute_offset(depth_offset, k, vmSymbols::depth_name(), vmSymbols::int_signature());
+  InstanceKlass* k = SystemDictionary::Throwable_klass();
+  compute_offset(backtrace_offset,     k, "backtrace", vmSymbols::object_signature());
+  compute_offset(detailMessage_offset, k, "detailMessage", vmSymbols::string_signature());
+  compute_offset(stackTrace_offset,    k, "stackTrace",    vmSymbols::java_lang_StackTraceElement_array());
+  compute_offset(depth_offset,         k, "depth", vmSymbols::int_signature());
+  compute_offset(static_unassigned_stacktrace_offset, k, "UNASSIGNED_STACK", vmSymbols::java_lang_StackTraceElement_array(),
+                 /*is_static*/true);
 }
 
 oop java_lang_Throwable::unassigned_stacktrace() {
@@ -2270,23 +2268,23 @@
 }
 
 void java_lang_StackFrameInfo::compute_offsets() {
-  Klass* k = SystemDictionary::StackFrameInfo_klass();
-  compute_offset(_memberName_offset,     k, vmSymbols::memberName_name(),  vmSymbols::object_signature());
-  compute_offset(_bci_offset,            k, vmSymbols::bci_name(),         vmSymbols::short_signature());
+  InstanceKlass* k = SystemDictionary::StackFrameInfo_klass();
+  compute_offset(_memberName_offset,     k, "memberName",  vmSymbols::object_signature());
+  compute_offset(_bci_offset,            k, "bci",         vmSymbols::short_signature());
   STACKFRAMEINFO_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 void java_lang_LiveStackFrameInfo::compute_offsets() {
-  Klass* k = SystemDictionary::LiveStackFrameInfo_klass();
-  compute_offset(_monitors_offset,   k, vmSymbols::monitors_name(),    vmSymbols::object_array_signature());
-  compute_offset(_locals_offset,     k, vmSymbols::locals_name(),      vmSymbols::object_array_signature());
-  compute_offset(_operands_offset,   k, vmSymbols::operands_name(),    vmSymbols::object_array_signature());
-  compute_offset(_mode_offset,       k, vmSymbols::mode_name(),        vmSymbols::int_signature());
+  InstanceKlass* k = SystemDictionary::LiveStackFrameInfo_klass();
+  compute_offset(_monitors_offset,   k, "monitors",    vmSymbols::object_array_signature());
+  compute_offset(_locals_offset,     k, "locals",      vmSymbols::object_array_signature());
+  compute_offset(_operands_offset,   k, "operands",    vmSymbols::object_array_signature());
+  compute_offset(_mode_offset,       k, "mode",        vmSymbols::int_signature());
 }
 
 void java_lang_reflect_AccessibleObject::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_AccessibleObject_klass();
-  compute_offset(override_offset, k, vmSymbols::override_name(), vmSymbols::bool_signature());
+  InstanceKlass* k = SystemDictionary::reflect_AccessibleObject_klass();
+  compute_offset(override_offset, k, "override", vmSymbols::bool_signature());
 }
 
 jboolean java_lang_reflect_AccessibleObject::override(oop reflect) {
@@ -2300,7 +2298,7 @@
 }
 
 void java_lang_reflect_Method::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Method_klass();
+  InstanceKlass* k = SystemDictionary::reflect_Method_klass();
   compute_offset(clazz_offset,          k, vmSymbols::clazz_name(),          vmSymbols::class_signature());
   compute_offset(name_offset,           k, vmSymbols::name_name(),           vmSymbols::string_signature());
   compute_offset(returnType_offset,     k, vmSymbols::returnType_name(),     vmSymbols::class_signature());
@@ -2481,7 +2479,7 @@
 }
 
 void java_lang_reflect_Constructor::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Constructor_klass();
+  InstanceKlass* k = SystemDictionary::reflect_Constructor_klass();
   compute_offset(clazz_offset,          k, vmSymbols::clazz_name(),          vmSymbols::class_signature());
   compute_offset(parameterTypes_offset, k, vmSymbols::parameterTypes_name(), vmSymbols::class_array_signature());
   compute_offset(exceptionTypes_offset, k, vmSymbols::exceptionTypes_name(), vmSymbols::class_array_signature());
@@ -2623,7 +2621,7 @@
 }
 
 void java_lang_reflect_Field::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Field_klass();
+  InstanceKlass* k = SystemDictionary::reflect_Field_klass();
   compute_offset(clazz_offset,     k, vmSymbols::clazz_name(),     vmSymbols::class_signature());
   compute_offset(name_offset,      k, vmSymbols::name_name(),      vmSymbols::string_signature());
   compute_offset(type_offset,      k, vmSymbols::type_name(),      vmSymbols::class_signature());
@@ -2747,22 +2745,17 @@
 }
 
 void reflect_ConstantPool::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_ConstantPool_klass();
-  // This null test can be removed post beta
-  if (k != NULL) {
-    // The field is called ConstantPool* in the sun.reflect.ConstantPool class.
-    compute_offset(_oop_offset, k, vmSymbols::ConstantPool_name(), vmSymbols::object_signature());
-  }
+  InstanceKlass* k = SystemDictionary::reflect_ConstantPool_klass();
+  // The field is called ConstantPool* in the sun.reflect.ConstantPool class.
+  compute_offset(_oop_offset, k, "constantPoolOop", vmSymbols::object_signature());
 }
 
 void java_lang_reflect_Parameter::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_Parameter_klass();
-  if(NULL != k) {
-    compute_offset(name_offset,        k, vmSymbols::name_name(),        vmSymbols::string_signature());
-    compute_offset(modifiers_offset,   k, vmSymbols::modifiers_name(),   vmSymbols::int_signature());
-    compute_offset(index_offset,       k, vmSymbols::index_name(),       vmSymbols::int_signature());
-    compute_offset(executable_offset,  k, vmSymbols::executable_name(),  vmSymbols::executable_signature());
-  }
+  InstanceKlass* k = SystemDictionary::reflect_Parameter_klass();
+  compute_offset(name_offset,        k, vmSymbols::name_name(),        vmSymbols::string_signature());
+  compute_offset(modifiers_offset,   k, vmSymbols::modifiers_name(),   vmSymbols::int_signature());
+  compute_offset(index_offset,       k, vmSymbols::index_name(),       vmSymbols::int_signature());
+  compute_offset(executable_offset,  k, vmSymbols::executable_name(),  vmSymbols::executable_signature());
 }
 
 Handle java_lang_reflect_Parameter::create(TRAPS) {
@@ -2836,12 +2829,10 @@
 }
 
 void java_lang_Module::compute_offsets() {
-  Klass* k = SystemDictionary::Module_klass();
-  if(NULL != k) {
-    compute_offset(loader_offset,  k, vmSymbols::loader_name(),  vmSymbols::classloader_signature());
-    compute_offset(name_offset,    k, vmSymbols::name_name(),    vmSymbols::string_signature());
-    MODULE_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
-  }
+  InstanceKlass* k = SystemDictionary::Module_klass();
+  compute_offset(loader_offset,  k, vmSymbols::loader_name(),  vmSymbols::classloader_signature());
+  compute_offset(name_offset,    k, vmSymbols::name_name(),    vmSymbols::string_signature());
+  MODULE_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 
@@ -2921,12 +2912,8 @@
 }
 
 void reflect_UnsafeStaticFieldAccessorImpl::compute_offsets() {
-  Klass* k = SystemDictionary::reflect_UnsafeStaticFieldAccessorImpl_klass();
-  // This null test can be removed post beta
-  if (k != NULL) {
-    compute_offset(_base_offset, k,
-                   vmSymbols::base_name(), vmSymbols::object_signature());
-  }
+  InstanceKlass* k = SystemDictionary::reflect_UnsafeStaticFieldAccessorImpl_klass();
+  compute_offset(_base_offset, k, "base", vmSymbols::object_signature());
 }
 
 oop java_lang_boxing_object::initialize_and_allocate(BasicType type, TRAPS) {
@@ -3084,6 +3071,13 @@
 }
 
 // Support for java_lang_ref_SoftReference
+//
+
+void java_lang_ref_SoftReference::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::SoftReference_klass();
+  compute_offset(timestamp_offset,    k, "timestamp", vmSymbols::long_signature());
+  compute_offset(static_clock_offset, k, "clock",     vmSymbols::long_signature(), true);
+}
 
 jlong java_lang_ref_SoftReference::timestamp(oop ref) {
   return ref->long_field(timestamp_offset);
@@ -3113,10 +3107,8 @@
 }
 
 void java_lang_invoke_DirectMethodHandle::compute_offsets() {
-  Klass* k = SystemDictionary::DirectMethodHandle_klass();
-  if (k != NULL) {
-    compute_offset(_member_offset, k, vmSymbols::member_name(), vmSymbols::java_lang_invoke_MemberName_signature());
-  }
+  InstanceKlass* k = SystemDictionary::DirectMethodHandle_klass();
+  compute_offset(_member_offset, k, "member", vmSymbols::java_lang_invoke_MemberName_signature());
 }
 
 // Support for java_lang_invoke_MethodHandle
@@ -3137,16 +3129,13 @@
 int java_lang_invoke_LambdaForm::_vmentry_offset;
 
 void java_lang_invoke_MethodHandle::compute_offsets() {
-  Klass* k = SystemDictionary::MethodHandle_klass();
-  if (k != NULL) {
-    compute_offset(_type_offset, k, vmSymbols::type_name(), vmSymbols::java_lang_invoke_MethodType_signature());
-    compute_offset(_form_offset, k, vmSymbols::form_name(), vmSymbols::java_lang_invoke_LambdaForm_signature());
-  }
+  InstanceKlass* k = SystemDictionary::MethodHandle_klass();
+  compute_offset(_type_offset, k, vmSymbols::type_name(), vmSymbols::java_lang_invoke_MethodType_signature());
+  compute_offset(_form_offset, k, "form", vmSymbols::java_lang_invoke_LambdaForm_signature());
 }
 
 void java_lang_invoke_MemberName::compute_offsets() {
-  Klass* k = SystemDictionary::MemberName_klass();
-  assert (k != NULL, "jdk mismatch");
+  InstanceKlass* k = SystemDictionary::MemberName_klass();
   compute_offset(_clazz_offset,   k, vmSymbols::clazz_name(),   vmSymbols::class_signature());
   compute_offset(_name_offset,    k, vmSymbols::name_name(),    vmSymbols::string_signature());
   compute_offset(_type_offset,    k, vmSymbols::type_name(),    vmSymbols::object_signature());
@@ -3156,15 +3145,15 @@
 }
 
 void java_lang_invoke_ResolvedMethodName::compute_offsets() {
-  Klass* k = SystemDictionary::ResolvedMethodName_klass();
+  InstanceKlass* k = SystemDictionary::ResolvedMethodName_klass();
   assert(k != NULL, "jdk mismatch");
   RESOLVEDMETHOD_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 void java_lang_invoke_LambdaForm::compute_offsets() {
-  Klass* k = SystemDictionary::LambdaForm_klass();
+  InstanceKlass* k = SystemDictionary::LambdaForm_klass();
   assert (k != NULL, "jdk mismatch");
-  compute_offset(_vmentry_offset, k, vmSymbols::vmentry_name(), vmSymbols::java_lang_invoke_MemberName_signature());
+  compute_offset(_vmentry_offset, k, "vmentry", vmSymbols::java_lang_invoke_MemberName_signature());
 }
 
 bool java_lang_invoke_LambdaForm::is_instance(oop obj) {
@@ -3305,11 +3294,9 @@
 int java_lang_invoke_MethodType::_ptypes_offset;
 
 void java_lang_invoke_MethodType::compute_offsets() {
-  Klass* k = SystemDictionary::MethodType_klass();
-  if (k != NULL) {
-    compute_offset(_rtype_offset,  k, vmSymbols::rtype_name(),  vmSymbols::class_signature());
-    compute_offset(_ptypes_offset, k, vmSymbols::ptypes_name(), vmSymbols::class_array_signature());
-  }
+  InstanceKlass* k = SystemDictionary::MethodType_klass();
+  compute_offset(_rtype_offset,  k, "rtype",  vmSymbols::class_signature());
+  compute_offset(_ptypes_offset, k, "ptypes", vmSymbols::class_array_signature());
 }
 
 void java_lang_invoke_MethodType::print_signature(oop mt, outputStream* st) {
@@ -3392,12 +3379,10 @@
 int java_lang_invoke_CallSite::_context_offset;
 
 void java_lang_invoke_CallSite::compute_offsets() {
-  Klass* k = SystemDictionary::CallSite_klass();
-  if (k != NULL) {
-    compute_offset(_target_offset, k, vmSymbols::target_name(), vmSymbols::java_lang_invoke_MethodHandle_signature());
-    compute_offset(_context_offset, k, vmSymbols::context_name(),
-                   vmSymbols::java_lang_invoke_MethodHandleNatives_CallSiteContext_signature());
-  }
+  InstanceKlass* k = SystemDictionary::CallSite_klass();
+  compute_offset(_target_offset,  k, "target", vmSymbols::java_lang_invoke_MethodHandle_signature());
+  compute_offset(_context_offset, k, "context",
+                 vmSymbols::java_lang_invoke_MethodHandleNatives_CallSiteContext_signature());
 }
 
 oop java_lang_invoke_CallSite::context(oop call_site) {
@@ -3412,10 +3397,8 @@
 int java_lang_invoke_MethodHandleNatives_CallSiteContext::_vmdependencies_offset;
 
 void java_lang_invoke_MethodHandleNatives_CallSiteContext::compute_offsets() {
-  Klass* k = SystemDictionary::Context_klass();
-  if (k != NULL) {
-    CALLSITECONTEXT_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
-  }
+  InstanceKlass* k = SystemDictionary::Context_klass();
+  CALLSITECONTEXT_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
 
 DependencyContext java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(oop call_site) {
@@ -3434,28 +3417,12 @@
 
 void java_security_AccessControlContext::compute_offsets() {
   assert(_isPrivileged_offset == 0, "offsets should be initialized only once");
-  fieldDescriptor fd;
-  InstanceKlass* ik = SystemDictionary::AccessControlContext_klass();
-
-  if (!ik->find_local_field(vmSymbols::context_name(), vmSymbols::protectiondomain_signature(), &fd)) {
-    fatal("Invalid layout of java.security.AccessControlContext");
-  }
-  _context_offset = fd.offset();
-
-  if (!ik->find_local_field(vmSymbols::privilegedContext_name(), vmSymbols::accesscontrolcontext_signature(), &fd)) {
-    fatal("Invalid layout of java.security.AccessControlContext");
-  }
-  _privilegedContext_offset = fd.offset();
-
-  if (!ik->find_local_field(vmSymbols::isPrivileged_name(), vmSymbols::bool_signature(), &fd)) {
-    fatal("Invalid layout of java.security.AccessControlContext");
-  }
-  _isPrivileged_offset = fd.offset();
-
-  // The offset may not be present for bootstrapping with older JDK.
-  if (ik->find_local_field(vmSymbols::isAuthorized_name(), vmSymbols::bool_signature(), &fd)) {
-    _isAuthorized_offset = fd.offset();
-  }
+  InstanceKlass* k = SystemDictionary::AccessControlContext_klass();
+
+  compute_offset(_context_offset,           k, "context",      vmSymbols::protectiondomain_signature());
+  compute_offset(_privilegedContext_offset, k, "privilegedContext", vmSymbols::accesscontrolcontext_signature());
+  compute_offset(_isPrivileged_offset,      k, "isPrivileged", vmSymbols::bool_signature());
+  compute_offset(_isAuthorized_offset,      k, "isAuthorized", vmSymbols::bool_signature());
 }
 
 
@@ -3504,16 +3471,17 @@
   assert(!offsets_computed, "offsets should be initialized only once");
   offsets_computed = true;
 
-  // The field indicating parallelCapable (parallelLockMap) is only present starting in 7,
-  Klass* k1 = SystemDictionary::ClassLoader_klass();
-  compute_optional_offset(parallelCapable_offset,
-    k1, vmSymbols::parallelCapable_name(), vmSymbols::concurrenthashmap_signature());
+  InstanceKlass* k1 = SystemDictionary::ClassLoader_klass();
+  compute_offset(parallelCapable_offset,
+    k1, "parallelLockMap", vmSymbols::concurrenthashmap_signature());
 
   compute_offset(name_offset,
     k1, vmSymbols::name_name(), vmSymbols::string_signature());
 
   compute_offset(unnamedModule_offset,
-    k1, vmSymbols::unnamedModule_name(), vmSymbols::module_signature());
+    k1, "unnamedModule", vmSymbols::module_signature());
+
+  compute_offset(parent_offset, k1, "parent", vmSymbols::classloader_signature());
 
   CLASSLOADER_INJECTED_FIELDS(INJECTED_FIELD_COMPUTE_OFFSET);
 }
@@ -3600,19 +3568,18 @@
 }
 
 // Support for java_lang_System
-int java_lang_System::in_offset_in_bytes() {
-  return (InstanceMirrorKlass::offset_of_static_fields() + static_in_offset);
-}
-
-
-int java_lang_System::out_offset_in_bytes() {
-  return (InstanceMirrorKlass::offset_of_static_fields() + static_out_offset);
-}
-
-
-int java_lang_System::err_offset_in_bytes() {
-  return (InstanceMirrorKlass::offset_of_static_fields() + static_err_offset);
-}
+//
+void java_lang_System::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::System_klass();
+  compute_offset(static_in_offset,  k, "in",  vmSymbols::input_stream_signature(), true);
+  compute_offset(static_out_offset, k, "out", vmSymbols::print_stream_signature(), true);
+  compute_offset(static_err_offset, k, "err", vmSymbols::print_stream_signature(), true);
+  compute_offset(static_security_offset, k, "security", vmSymbols::security_manager_signature(), true);
+}
+
+int java_lang_System::in_offset_in_bytes() { return static_in_offset; }
+int java_lang_System::out_offset_in_bytes() { return static_out_offset; }
+int java_lang_System::err_offset_in_bytes() { return static_err_offset; }
 
 
 bool java_lang_System::has_security_manager() {
@@ -3682,7 +3649,6 @@
 int java_lang_ref_Reference::queue_offset;
 int java_lang_ref_Reference::next_offset;
 int java_lang_ref_Reference::discovered_offset;
-int java_lang_ref_Reference::number_of_fake_oop_fields;
 int java_lang_ref_SoftReference::timestamp_offset;
 int java_lang_ref_SoftReference::static_clock_offset;
 int java_lang_ClassLoader::parent_offset;
@@ -3717,6 +3683,17 @@
 
 
 // Support for java_lang_StackTraceElement
+void java_lang_StackTraceElement::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::StackTraceElement_klass();
+  compute_offset(declaringClassObject_offset,  k, "declaringClassObject", vmSymbols::class_signature());
+  compute_offset(classLoaderName_offset, k, "classLoaderName", vmSymbols::string_signature());
+  compute_offset(moduleName_offset,      k, "moduleName",      vmSymbols::string_signature());
+  compute_offset(moduleVersion_offset,   k, "moduleVersion",   vmSymbols::string_signature());
+  compute_offset(declaringClass_offset,  k, "declaringClass",  vmSymbols::string_signature());
+  compute_offset(methodName_offset,      k, "methodName",      vmSymbols::string_signature());
+  compute_offset(fileName_offset,        k, "fileName",        vmSymbols::string_signature());
+  compute_offset(lineNumber_offset,      k, "lineNumber",      vmSymbols::int_signature());
+}
 
 void java_lang_StackTraceElement::set_fileName(oop element, oop value) {
   element->obj_field_put(fileName_offset, value);
@@ -3776,6 +3753,16 @@
 
 // Support for java Assertions - java_lang_AssertionStatusDirectives.
 
+void java_lang_AssertionStatusDirectives::compute_offsets() {
+  InstanceKlass* k = SystemDictionary::AssertionStatusDirectives_klass();
+  compute_offset(classes_offset,        k, "classes",        vmSymbols::string_array_signature());
+  compute_offset(classEnabled_offset,   k, "classEnabled",   vmSymbols::bool_array_signature());
+  compute_offset(packages_offset,       k, "packages",       vmSymbols::string_array_signature());
+  compute_offset(packageEnabled_offset, k, "packageEnabled", vmSymbols::bool_array_signature());
+  compute_offset(deflt_offset,          k, "deflt",          vmSymbols::bool_signature());
+}
+
+
 void java_lang_AssertionStatusDirectives::set_classes(oop o, oop val) {
   o->obj_field_put(classes_offset, val);
 }
@@ -3804,18 +3791,18 @@
 
 
 void java_nio_Buffer::compute_offsets() {
-  Klass* k = SystemDictionary::nio_Buffer_klass();
+  InstanceKlass* k = SystemDictionary::nio_Buffer_klass();
   assert(k != NULL, "must be loaded in 1.4+");
-  compute_offset(_limit_offset, k, vmSymbols::limit_name(), vmSymbols::int_signature());
+  compute_offset(_limit_offset, k, "limit", vmSymbols::int_signature());
 }
 
 void java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(TRAPS) {
   if (_owner_offset != 0) return;
 
   SystemDictionary::load_abstract_ownable_synchronizer_klass(CHECK);
-  Klass* k = SystemDictionary::abstract_ownable_synchronizer_klass();
+  InstanceKlass* k = SystemDictionary::abstract_ownable_synchronizer_klass();
   compute_offset(_owner_offset, k,
-                 vmSymbols::exclusive_owner_thread_name(), vmSymbols::thread_signature());
+                 "exclusiveOwnerThread", vmSymbols::thread_signature());
 }
 
 oop java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(oop obj) {
@@ -3823,71 +3810,37 @@
   return obj->obj_field(_owner_offset);
 }
 
+static int member_offset(int hardcoded_offset) {
+  return (hardcoded_offset * heapOopSize) + instanceOopDesc::base_offset_in_bytes();
+}
+
 // Compute hard-coded offsets
 // Invoked before SystemDictionary::initialize, so pre-loaded classes
 // are not available to determine the offset_of_static_fields.
 void JavaClasses::compute_hard_coded_offsets() {
-  const int x = heapOopSize;
-  const int header = instanceOopDesc::base_offset_in_bytes();
-
-  // Throwable Class
-  java_lang_Throwable::backtrace_offset  = java_lang_Throwable::hc_backtrace_offset  * x + header;
-  java_lang_Throwable::detailMessage_offset = java_lang_Throwable::hc_detailMessage_offset * x + header;
-  java_lang_Throwable::stackTrace_offset = java_lang_Throwable::hc_stackTrace_offset * x + header;
-  java_lang_Throwable::static_unassigned_stacktrace_offset = java_lang_Throwable::hc_static_unassigned_stacktrace_offset *  x;
 
   // java_lang_boxing_object
-  java_lang_boxing_object::value_offset = java_lang_boxing_object::hc_value_offset + header;
-  java_lang_boxing_object::long_value_offset = align_up((java_lang_boxing_object::hc_value_offset + header), BytesPerLong);
-
-  // java_lang_ref_Reference:
-  java_lang_ref_Reference::referent_offset = java_lang_ref_Reference::hc_referent_offset * x + header;
-  java_lang_ref_Reference::queue_offset = java_lang_ref_Reference::hc_queue_offset * x + header;
-  java_lang_ref_Reference::next_offset  = java_lang_ref_Reference::hc_next_offset * x + header;
-  java_lang_ref_Reference::discovered_offset  = java_lang_ref_Reference::hc_discovered_offset * x + header;
-  // Artificial fields for java_lang_ref_Reference
-  // The first field is for the discovered field added in 1.4
-  java_lang_ref_Reference::number_of_fake_oop_fields = 1;
-
-  // java_lang_ref_SoftReference Class
-  java_lang_ref_SoftReference::timestamp_offset = align_up((java_lang_ref_SoftReference::hc_timestamp_offset * x + header), BytesPerLong);
-  // Don't multiply static fields because they are always in wordSize units
-  java_lang_ref_SoftReference::static_clock_offset = java_lang_ref_SoftReference::hc_static_clock_offset * x;
-
-  // java_lang_ClassLoader
-  java_lang_ClassLoader::parent_offset = java_lang_ClassLoader::hc_parent_offset * x + header;
-
-  // java_lang_System
-  java_lang_System::static_in_offset  = java_lang_System::hc_static_in_offset  * x;
-  java_lang_System::static_out_offset = java_lang_System::hc_static_out_offset * x;
-  java_lang_System::static_err_offset = java_lang_System::hc_static_err_offset * x;
-  java_lang_System::static_security_offset = java_lang_System::hc_static_security_offset * x;
-
-  // java_lang_StackTraceElement
-  java_lang_StackTraceElement::declaringClassObject_offset = java_lang_StackTraceElement::hc_declaringClassObject_offset * x + header;
-  java_lang_StackTraceElement::classLoaderName_offset = java_lang_StackTraceElement::hc_classLoaderName_offset * x + header;
-  java_lang_StackTraceElement::moduleName_offset = java_lang_StackTraceElement::hc_moduleName_offset * x + header;
-  java_lang_StackTraceElement::moduleVersion_offset = java_lang_StackTraceElement::hc_moduleVersion_offset * x + header;
-  java_lang_StackTraceElement::declaringClass_offset = java_lang_StackTraceElement::hc_declaringClass_offset  * x + header;
-  java_lang_StackTraceElement::methodName_offset = java_lang_StackTraceElement::hc_methodName_offset * x + header;
-  java_lang_StackTraceElement::fileName_offset   = java_lang_StackTraceElement::hc_fileName_offset   * x + header;
-  java_lang_StackTraceElement::lineNumber_offset = java_lang_StackTraceElement::hc_lineNumber_offset * x + header;
-  java_lang_AssertionStatusDirectives::classes_offset = java_lang_AssertionStatusDirectives::hc_classes_offset * x + header;
-  java_lang_AssertionStatusDirectives::classEnabled_offset = java_lang_AssertionStatusDirectives::hc_classEnabled_offset * x + header;
-  java_lang_AssertionStatusDirectives::packages_offset = java_lang_AssertionStatusDirectives::hc_packages_offset * x + header;
-  java_lang_AssertionStatusDirectives::packageEnabled_offset = java_lang_AssertionStatusDirectives::hc_packageEnabled_offset * x + header;
-  java_lang_AssertionStatusDirectives::deflt_offset = java_lang_AssertionStatusDirectives::hc_deflt_offset * x + header;
-
+  java_lang_boxing_object::value_offset      = member_offset(java_lang_boxing_object::hc_value_offset);
+  java_lang_boxing_object::long_value_offset = align_up(member_offset(java_lang_boxing_object::hc_value_offset), BytesPerLong);
+
+  // java_lang_ref_Reference
+  java_lang_ref_Reference::referent_offset    = member_offset(java_lang_ref_Reference::hc_referent_offset);
+  java_lang_ref_Reference::queue_offset       = member_offset(java_lang_ref_Reference::hc_queue_offset);
+  java_lang_ref_Reference::next_offset        = member_offset(java_lang_ref_Reference::hc_next_offset);
+  java_lang_ref_Reference::discovered_offset  = member_offset(java_lang_ref_Reference::hc_discovered_offset);
 }
 
 
 // Compute non-hard-coded field offsets of all the classes in this file
 void JavaClasses::compute_offsets() {
   // java_lang_Class::compute_offsets was called earlier in bootstrap
+  java_lang_System::compute_offsets();
   java_lang_ClassLoader::compute_offsets();
   java_lang_Throwable::compute_offsets();
   java_lang_Thread::compute_offsets();
   java_lang_ThreadGroup::compute_offsets();
+  java_lang_AssertionStatusDirectives::compute_offsets();
+  java_lang_ref_SoftReference::compute_offsets();
   java_lang_invoke_MethodHandle::compute_offsets();
   java_lang_invoke_DirectMethodHandle::compute_offsets();
   java_lang_invoke_MemberName::compute_offsets();
@@ -3910,6 +3863,7 @@
   reflect_UnsafeStaticFieldAccessorImpl::compute_offsets();
   java_lang_reflect_Parameter::compute_offsets();
   java_lang_Module::compute_offsets();
+  java_lang_StackTraceElement::compute_offsets();
   java_lang_StackFrameInfo::compute_offsets();
   java_lang_LiveStackFrameInfo::compute_offsets();
 
@@ -3947,62 +3901,6 @@
   }
 }
 
-
-bool JavaClasses::check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) {
-  EXCEPTION_MARK;
-  fieldDescriptor fd;
-  TempNewSymbol klass_sym = SymbolTable::new_symbol(klass_name, CATCH);
-  Klass* k = SystemDictionary::resolve_or_fail(klass_sym, true, CATCH);
-  InstanceKlass* ik = InstanceKlass::cast(k);
-  TempNewSymbol f_name = SymbolTable::new_symbol(field_name, CATCH);
-  TempNewSymbol f_sig  = SymbolTable::new_symbol(field_sig, CATCH);
-  if (!ik->find_local_field(f_name, f_sig, &fd)) {
-    tty->print_cr("Static field %s.%s not found", klass_name, field_name);
-    return false;
-  }
-  if (!fd.is_static()) {
-    tty->print_cr("Static field %s.%s appears to be nonstatic", klass_name, field_name);
-    return false;
-  }
-  if (fd.offset() == hardcoded_offset + InstanceMirrorKlass::offset_of_static_fields()) {
-    return true;
-  } else {
-    tty->print_cr("Offset of static field %s.%s is hardcoded as %d but should really be %d.", klass_name, field_name, hardcoded_offset, fd.offset() - InstanceMirrorKlass::offset_of_static_fields());
-    return false;
-  }
-}
-
-
-bool JavaClasses::check_constant(const char *klass_name, int hardcoded_constant, const char *field_name, const char* field_sig) {
-  EXCEPTION_MARK;
-  fieldDescriptor fd;
-  TempNewSymbol klass_sym = SymbolTable::new_symbol(klass_name, CATCH);
-  Klass* k = SystemDictionary::resolve_or_fail(klass_sym, true, CATCH);
-  InstanceKlass* ik = InstanceKlass::cast(k);
-  TempNewSymbol f_name = SymbolTable::new_symbol(field_name, CATCH);
-  TempNewSymbol f_sig  = SymbolTable::new_symbol(field_sig, CATCH);
-  if (!ik->find_local_field(f_name, f_sig, &fd)) {
-    tty->print_cr("Static field %s.%s not found", klass_name, field_name);
-    return false;
-  }
-  if (!fd.is_static() || !fd.has_initial_value()) {
-    tty->print_cr("Static field %s.%s appears to be non-constant", klass_name, field_name);
-    return false;
-  }
-  if (!fd.initial_value_tag().is_int()) {
-    tty->print_cr("Static field %s.%s is not an int", klass_name, field_name);
-    return false;
-  }
-  jint field_value = fd.int_initial_value();
-  if (field_value == hardcoded_constant) {
-    return true;
-  } else {
-    tty->print_cr("Constant value of static field %s.%s is hardcoded as %d but should really be %d.", klass_name, field_name, hardcoded_constant, field_value);
-    return false;
-  }
-}
-
-
 // Check the hard-coded field offsets of all the classes in this file
 
 void JavaClasses::check_offsets() {
@@ -4014,31 +3912,6 @@
 #define CHECK_LONG_OFFSET(klass_name, cpp_klass_name, field_name, field_sig) \
   valid &= check_offset(klass_name, cpp_klass_name :: long_ ## field_name ## _offset, #field_name, field_sig)
 
-#define CHECK_STATIC_OFFSET(klass_name, cpp_klass_name, field_name, field_sig) \
-  valid &= check_static_offset(klass_name, cpp_klass_name :: static_ ## field_name ## _offset, #field_name, field_sig)
-
-#define CHECK_CONSTANT(klass_name, cpp_klass_name, field_name, field_sig) \
-  valid &= check_constant(klass_name, cpp_klass_name :: field_name, #field_name, field_sig)
-
-  // java.lang.String
-
-  CHECK_OFFSET("java/lang/String", java_lang_String, value, "[B");
-  CHECK_OFFSET("java/lang/String", java_lang_String, hash, "I");
-  CHECK_OFFSET("java/lang/String", java_lang_String, coder, "B");
-
-  // java.lang.Class
-
-  // Fake fields
-  // CHECK_OFFSET("java/lang/Class", java_lang_Class, klass); // %%% this needs to be checked
-  // CHECK_OFFSET("java/lang/Class", java_lang_Class, array_klass); // %%% this needs to be checked
-
-  // java.lang.Throwable
-
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, backtrace, "Ljava/lang/Object;");
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, detailMessage, "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, stackTrace, "[Ljava/lang/StackTraceElement;");
-  CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, depth, "I");
-
   // Boxed primitive objects (java_lang_boxing_object)
 
   CHECK_OFFSET("java/lang/Boolean",   java_lang_boxing_object, value, "Z");
@@ -4050,28 +3923,6 @@
   CHECK_OFFSET("java/lang/Integer",   java_lang_boxing_object, value, "I");
   CHECK_LONG_OFFSET("java/lang/Long", java_lang_boxing_object, value, "J");
 
-  // java.lang.ClassLoader
-
-  CHECK_OFFSET("java/lang/ClassLoader", java_lang_ClassLoader, parent,        "Ljava/lang/ClassLoader;");
-
-  // java.lang.System
-
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System,  in, "Ljava/io/InputStream;");
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, out, "Ljava/io/PrintStream;");
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, err, "Ljava/io/PrintStream;");
-  CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, security, "Ljava/lang/SecurityManager;");
-
-  // java.lang.StackTraceElement
-
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, declaringClassObject, "Ljava/lang/Class;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, classLoaderName, "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, moduleName,      "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, moduleVersion,   "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, declaringClass,  "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, methodName,      "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, fileName,        "Ljava/lang/String;");
-  CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, lineNumber,      "I");
-
   // java.lang.ref.Reference
 
   CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, referent, "Ljava/lang/Object;");
@@ -4080,28 +3931,6 @@
   // Fake field
   //CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, discovered, "Ljava/lang/ref/Reference;");
 
-  // java.lang.ref.SoftReference
-
-  CHECK_OFFSET("java/lang/ref/SoftReference", java_lang_ref_SoftReference, timestamp, "J");
-  CHECK_STATIC_OFFSET("java/lang/ref/SoftReference", java_lang_ref_SoftReference, clock, "J");
-
-  // java.lang.AssertionStatusDirectives
-  //
-  // The CheckAssertionStatusDirectives boolean can be removed from here and
-  // globals.hpp after the AssertionStatusDirectives class has been integrated
-  // into merlin "for some time."  Without it, the vm will fail with early
-  // merlin builds.
-
-  if (CheckAssertionStatusDirectives) {
-    const char* nm = "java/lang/AssertionStatusDirectives";
-    const char* sig = "[Ljava/lang/String;";
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, classes, sig);
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, classEnabled, "[Z");
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, packages, sig);
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, packageEnabled, "[Z");
-    CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, deflt, "Z");
-  }
-
   if (!valid) vm_exit_during_initialization("Hard-coded field offset verification failed");
 }
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/javaClasses.hpp
--- a/src/hotspot/share/classfile/javaClasses.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/javaClasses.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -102,6 +102,7 @@
 
   // Accessors
   static inline typeArrayOop value(oop java_string);
+  static inline typeArrayOop value_no_keepalive(oop java_string);
   static inline unsigned int hash(oop java_string);
   static inline bool is_latin1(oop java_string);
   static inline int length(oop java_string);
@@ -444,9 +445,6 @@
     hc_cause_offset         =  2,  // New since 1.4
     hc_stackTrace_offset    =  3   // New since 1.4
   };
-  enum {
-      hc_static_unassigned_stacktrace_offset = 0  // New since 1.7
-  };
   // Trace constants
   enum {
     trace_methods_offset = 0,
@@ -878,7 +876,6 @@
   static int queue_offset;
   static int next_offset;
   static int discovered_offset;
-  static int number_of_fake_oop_fields;
 
   // Accessors
   static inline oop referent(oop ref);
@@ -902,14 +899,6 @@
 
 class java_lang_ref_SoftReference: public java_lang_ref_Reference {
  public:
-  enum {
-   // The timestamp is a long field and may need to be adjusted for alignment.
-   hc_timestamp_offset  = hc_discovered_offset + 1
-  };
-  enum {
-   hc_static_clock_offset = 0
-  };
-
   static int timestamp_offset;
   static int static_clock_offset;
 
@@ -919,6 +908,8 @@
   // Accessors for statics
   static jlong clock();
   static void set_clock(jlong value);
+
+  static void compute_offsets();
 };
 
 // Interface to java.lang.invoke.MethodHandle objects
@@ -1228,10 +1219,6 @@
 
 class java_lang_ClassLoader : AllStatic {
  private:
-  // The fake offsets are added by the class loader when java.lang.Class is loaded
-  enum {
-   hc_parent_offset = 0
-  };
   static int _loader_data_offset;
   static bool offsets_computed;
   static int parent_offset;
@@ -1279,13 +1266,6 @@
 
 class java_lang_System : AllStatic {
  private:
-  enum {
-   hc_static_in_offset  = 0,
-   hc_static_out_offset = 1,
-   hc_static_err_offset = 2,
-   hc_static_security_offset = 3
-  };
-
   static int  static_in_offset;
   static int static_out_offset;
   static int static_err_offset;
@@ -1298,6 +1278,8 @@
 
   static bool has_security_manager();
 
+  static void compute_offsets();
+
   // Debugging
   friend class JavaClasses;
 };
@@ -1307,17 +1289,6 @@
 
 class java_lang_StackTraceElement: AllStatic {
  private:
-  enum {
-    hc_declaringClassObject_offset    = 0,
-    hc_classLoaderName_offset      = 1,
-    hc_moduleName_offset           = 2,
-    hc_moduleVersion_offset        = 3,
-    hc_declaringClass_offset       = 4,
-    hc_methodName_offset           = 5,
-    hc_fileName_offset             = 6,
-    hc_lineNumber_offset           = 7
-  };
-
   static int declaringClassObject_offset;
   static int classLoaderName_offset;
   static int moduleName_offset;
@@ -1344,6 +1315,8 @@
   static void fill_in(Handle element, InstanceKlass* holder, const methodHandle& method,
                       int version, int bci, Symbol* name, TRAPS);
 
+  static void compute_offsets();
+
   // Debugging
   friend class JavaClasses;
 };
@@ -1416,14 +1389,6 @@
 
 class java_lang_AssertionStatusDirectives: AllStatic {
  private:
-  enum {
-    hc_classes_offset,
-    hc_classEnabled_offset,
-    hc_packages_offset,
-    hc_packageEnabled_offset,
-    hc_deflt_offset
-  };
-
   static int classes_offset;
   static int classEnabled_offset;
   static int packages_offset;
@@ -1437,6 +1402,9 @@
   static void set_packages(oop obj, oop val);
   static void set_packageEnabled(oop obj, oop val);
   static void set_deflt(oop obj, bool val);
+
+  static void compute_offsets();
+
   // Debugging
   friend class JavaClasses;
 };
@@ -1508,9 +1476,6 @@
   static InjectedField _injected_fields[];
 
   static bool check_offset(const char *klass_name, int offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
-  static bool check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
-  static bool check_constant(const char *klass_name, int constant, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
-
  public:
   enum InjectedFieldID {
     ALL_INJECTED_FIELDS(DECLARE_INJECTED_FIELD_ENUM)
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/javaClasses.inline.hpp
--- a/src/hotspot/share/classfile/javaClasses.inline.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/javaClasses.inline.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -26,6 +26,7 @@
 #define SHARE_VM_CLASSFILE_JAVACLASSES_INLINE_HPP
 
 #include "classfile/javaClasses.hpp"
+#include "oops/access.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oopsHierarchy.hpp"
 
@@ -53,6 +54,11 @@
   assert(is_instance(java_string), "must be java_string");
   return (typeArrayOop) java_string->obj_field(value_offset);
 }
+typeArrayOop java_lang_String::value_no_keepalive(oop java_string) {
+  assert(initialized && (value_offset > 0), "Must be initialized");
+  assert(is_instance(java_string), "must be java_string");
+  return (typeArrayOop) java_string->obj_field_access<AS_NO_KEEPALIVE>(value_offset);
+}
 unsigned int java_lang_String::hash(oop java_string) {
   assert(initialized && (hash_offset > 0), "Must be initialized");
   assert(is_instance(java_string), "must be java_string");
@@ -68,11 +74,11 @@
 int java_lang_String::length(oop java_string) {
   assert(initialized, "Must be initialized");
   assert(is_instance(java_string), "must be java_string");
-  typeArrayOop value_array = ((typeArrayOop)java_string->obj_field(value_offset));
-  if (value_array == NULL) {
+  typeArrayOop value = java_lang_String::value_no_keepalive(java_string);
+  if (value == NULL) {
     return 0;
   }
-  int arr_length = value_array->length();
+  int arr_length = value->length();
   if (!is_latin1(java_string)) {
     assert((arr_length & 1) == 0, "should be even for UTF16 string");
     arr_length >>= 1; // convert number of bytes to number of elements
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/stringTable.cpp
--- a/src/hotspot/share/classfile/stringTable.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/stringTable.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -35,6 +35,7 @@
 #include "memory/filemap.hpp"
 #include "memory/metaspaceShared.hpp"
 #include "memory/resourceArea.hpp"
+#include "oops/access.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/atomic.hpp"
 #include "runtime/mutexLocker.hpp"
@@ -43,7 +44,6 @@
 #include "utilities/macros.hpp"
 #if INCLUDE_ALL_GCS
 #include "gc/g1/g1CollectedHeap.hpp"
-#include "gc/g1/g1SATBCardTableModRefBS.hpp"
 #include "gc/g1/g1StringDedup.hpp"
 #endif
 
@@ -124,6 +124,22 @@
   }
 }
 
+oop StringTable::string_object(HashtableEntry<oop, mtSymbol>* entry) {
+  return RootAccess<ON_PHANTOM_OOP_REF>::oop_load(entry->literal_addr());
+}
+
+oop StringTable::string_object_no_keepalive(HashtableEntry<oop, mtSymbol>* entry) {
+  // The AS_NO_KEEPALIVE peeks at the oop without keeping it alive.
+  // This is *very dangerous* in general but is okay in this specific
+  // case. The subsequent oop_load keeps the oop alive if it it matched
+  // the jchar* string.
+  return RootAccess<ON_PHANTOM_OOP_REF | AS_NO_KEEPALIVE>::oop_load(entry->literal_addr());
+}
+
+void StringTable::set_string_object(HashtableEntry<oop, mtSymbol>* entry, oop string) {
+  RootAccess<ON_PHANTOM_OOP_REF>::oop_store(entry->literal_addr(), string);
+}
+
 oop StringTable::lookup_shared(jchar* name, int len, unsigned int hash) {
   assert(hash == java_lang_String::hash_code(name, len),
          "hash must be computed using java_lang_String::hash_code");
@@ -131,13 +147,16 @@
 }
 
 oop StringTable::lookup_in_main_table(int index, jchar* name,
-                                int len, unsigned int hash) {
+                                      int len, unsigned int hash) {
   int count = 0;
   for (HashtableEntry<oop, mtSymbol>* l = bucket(index); l != NULL; l = l->next()) {
     count++;
     if (l->hash() == hash) {
-      if (java_lang_String::equals(l->literal(), name, len)) {
-        return l->literal();
+      if (java_lang_String::equals(string_object_no_keepalive(l), name, len)) {
+        // We must perform a new load with string_object() that keeps the string
+        // alive as we must expose the oop as strongly reachable when exiting
+        // this context, in case the oop gets published.
+        return string_object(l);
       }
     }
   }
@@ -192,18 +211,6 @@
   return lookup(chars, length);
 }
 
-// Tell the GC that this string was looked up in the StringTable.
-static void ensure_string_alive(oop string) {
-  // A lookup in the StringTable could return an object that was previously
-  // considered dead. The SATB part of G1 needs to get notified about this
-  // potential resurrection, otherwise the marking might not find the object.
-#if INCLUDE_ALL_GCS
-  if (UseG1GC && string != NULL) {
-    G1SATBCardTableModRefBS::enqueue(string);
-  }
-#endif
-}
-
 oop StringTable::lookup(jchar* name, int len) {
   // shared table always uses java_lang_String::hash_code
   unsigned int hash = java_lang_String::hash_code(name, len);
@@ -217,8 +224,6 @@
   int index = the_table()->hash_to_index(hash);
   string = the_table()->lookup_in_main_table(index, name, len, hash);
 
-  ensure_string_alive(string);
-
   return string;
 }
 
@@ -238,9 +243,6 @@
 
   // Found
   if (found_string != NULL) {
-    if (found_string != string_or_null()) {
-      ensure_string_alive(found_string);
-    }
     return found_string;
   }
 
@@ -276,10 +278,6 @@
                                   hashValue, CHECK_NULL);
   }
 
-  if (added_or_found != string()) {
-    ensure_string_alive(added_or_found);
-  }
-
   return added_or_found;
 }
 
@@ -388,9 +386,9 @@
     while (entry != NULL) {
       assert(!entry->is_shared(), "CDS not used for the StringTable");
 
-      if (is_alive->do_object_b(entry->literal())) {
+      if (is_alive->do_object_b(string_object_no_keepalive(entry))) {
         if (f != NULL) {
-          f->do_oop((oop*)entry->literal_addr());
+          f->do_oop(entry->literal_addr());
         }
         p = entry->next_addr();
       } else {
@@ -429,7 +427,7 @@
   for (int i = 0; i < the_table()->table_size(); ++i) {
     HashtableEntry<oop, mtSymbol>* p = the_table()->bucket(i);
     for ( ; p != NULL; p = p->next()) {
-      oop s = p->literal();
+      oop s = string_object_no_keepalive(p);
       guarantee(s != NULL, "interned string is NULL");
       unsigned int h = hash_string(s);
       guarantee(p->hash() == h, "broken hash in string table entry");
@@ -448,10 +446,10 @@
     for (int i = 0; i < the_table()->table_size(); ++i) {
       HashtableEntry<oop, mtSymbol>* p = the_table()->bucket(i);
       for ( ; p != NULL; p = p->next()) {
-        oop s = p->literal();
-        typeArrayOop value  = java_lang_String::value(s);
-        int          length = java_lang_String::length(s);
-        bool      is_latin1 = java_lang_String::is_latin1(s);
+        oop s = string_object_no_keepalive(p);
+        typeArrayOop value     = java_lang_String::value_no_keepalive(s);
+        int          length    = java_lang_String::length(s);
+        bool         is_latin1 = java_lang_String::is_latin1(s);
 
         if (length <= 0) {
           st->print("%d: ", length);
@@ -484,8 +482,8 @@
                                       HashtableEntry<oop, mtSymbol>* e_ptr2) {
   // These entries are sanity checked by verify_and_compare_entries()
   // before this function is called.
-  oop str1 = e_ptr1->literal();
-  oop str2 = e_ptr2->literal();
+  oop str1 = string_object_no_keepalive(e_ptr1);
+  oop str2 = string_object_no_keepalive(e_ptr2);
 
   if (str1 == str2) {
     tty->print_cr("ERROR: identical oop values (0x" PTR_FORMAT ") "
@@ -505,12 +503,12 @@
 }
 
 StringTable::VerifyRetTypes StringTable::verify_entry(int bkt, int e_cnt,
-                                      HashtableEntry<oop, mtSymbol>* e_ptr,
-                                      StringTable::VerifyMesgModes mesg_mode) {
+                                                      HashtableEntry<oop, mtSymbol>* e_ptr,
+                                                      StringTable::VerifyMesgModes mesg_mode) {
 
   VerifyRetTypes ret = _verify_pass;  // be optimistic
 
-  oop str = e_ptr->literal();
+  oop str = string_object_no_keepalive(e_ptr);
   if (str == NULL) {
     if (mesg_mode == _verify_with_mesgs) {
       tty->print_cr("ERROR: NULL oop value in entry @ bucket[%d][%d]", bkt,
@@ -684,7 +682,7 @@
   assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
 
   oop new_s = NULL;
-  typeArrayOop v = java_lang_String::value(s);
+  typeArrayOop v = java_lang_String::value_no_keepalive(s);
   typeArrayOop new_v = (typeArrayOop)MetaspaceShared::archive_heap_object(v, THREAD);
   if (new_v == NULL) {
     return NULL;
@@ -708,7 +706,7 @@
   for (int i = 0; i < the_table()->table_size(); ++i) {
     HashtableEntry<oop, mtSymbol>* bucket = the_table()->bucket(i);
     for ( ; bucket != NULL; bucket = bucket->next()) {
-      oop s = bucket->literal();
+      oop s = string_object_no_keepalive(bucket);
       unsigned int hash = java_lang_String::hash_code(s);
       if (hash == 0) {
         continue;
@@ -721,7 +719,7 @@
       }
 
       // set the archived string in bucket
-      bucket->set_literal(new_s);
+      set_string_object(bucket, new_s);
 
       // add to the compact table
       writer->add(hash, new_s);
@@ -763,4 +761,3 @@
   _shared_table.oops_do(f);
 }
 #endif //INCLUDE_CDS_JAVA_HEAP
-
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/stringTable.hpp
--- a/src/hotspot/share/classfile/stringTable.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/stringTable.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -76,6 +76,13 @@
   static unsigned int hash_string(oop string);
   static unsigned int alt_hash_string(const jchar* s, int len);
 
+  // Accessors for the string roots in the hashtable entries.
+  // Use string_object_no_keepalive() only when the value is not returned
+  // outside of a scope where a thread transition is possible.
+  static oop string_object(HashtableEntry<oop, mtSymbol>* entry);
+  static oop string_object_no_keepalive(HashtableEntry<oop, mtSymbol>* entry);
+  static void set_string_object(HashtableEntry<oop, mtSymbol>* entry, oop string);
+
   StringTable() : RehashableHashtable<oop, mtSymbol>((int)StringTableSize,
                               sizeof (HashtableEntry<oop, mtSymbol>)) {}
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/systemDictionary.hpp
--- a/src/hotspot/share/classfile/systemDictionary.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/systemDictionary.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -173,6 +173,7 @@
   do_klass(VolatileCallSite_klass,                      java_lang_invoke_VolatileCallSite,         Pre                 ) \
   /* Note: MethodHandle must be first, and VolatileCallSite last in group */                                             \
                                                                                                                          \
+  do_klass(AssertionStatusDirectives_klass,             java_lang_AssertionStatusDirectives,       Pre                 ) \
   do_klass(StringBuffer_klass,                          java_lang_StringBuffer,                    Pre                 ) \
   do_klass(StringBuilder_klass,                         java_lang_StringBuilder,                   Pre                 ) \
   do_klass(internal_Unsafe_klass,                       jdk_internal_misc_Unsafe,                  Pre                 ) \
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/classfile/vmSymbols.hpp
--- a/src/hotspot/share/classfile/vmSymbols.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/classfile/vmSymbols.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -251,7 +251,6 @@
   template(compiledLambdaForm_name,                   "<compiledLambdaForm>")  /*fake name*/      \
   template(star_name,                                 "*") /*not really a name*/                  \
   template(invoke_name,                               "invoke")                                   \
-  template(override_name,                             "override")                                 \
   template(parameterTypes_name,                       "parameterTypes")                           \
   template(returnType_name,                           "returnType")                               \
   template(signature_name,                            "signature")                                \
@@ -265,7 +264,6 @@
   template(parameter_annotations_name,                "parameterAnnotations")                     \
   template(annotation_default_name,                   "annotationDefault")                        \
   template(reflect_ConstantPool,                      "jdk/internal/reflect/ConstantPool")        \
-  template(ConstantPool_name,                         "constantPoolOop")                          \
   template(reflect_UnsafeStaticFieldAccessorImpl,     "jdk/internal/reflect/UnsafeStaticFieldAccessorImpl")\
   template(base_name,                                 "base")                                     \
   /* Type Annotations (JDK 8 and above) */                                                        \
@@ -341,8 +339,6 @@
   template(stillborn_name,                            "stillborn")                                \
   template(group_name,                                "group")                                    \
   template(daemon_name,                               "daemon")                                   \
-  template(eetop_name,                                "eetop")                                    \
-  template(thread_status_name,                        "threadStatus")                             \
   template(run_method_name,                           "run")                                      \
   template(exit_method_name,                          "exit")                                     \
   template(add_method_name,                           "add")                                      \
@@ -376,34 +372,21 @@
   template(fillInStackTrace_name,                     "fillInStackTrace")                         \
   template(getCause_name,                             "getCause")                                 \
   template(initCause_name,                            "initCause")                                \
-  template(depth_name,                                "depth")                                    \
   template(setProperty_name,                          "setProperty")                              \
   template(getProperty_name,                          "getProperty")                              \
   template(context_name,                              "context")                                  \
-  template(privilegedContext_name,                    "privilegedContext")                        \
   template(contextClassLoader_name,                   "contextClassLoader")                       \
   template(inheritedAccessControlContext_name,        "inheritedAccessControlContext")            \
-  template(isPrivileged_name,                         "isPrivileged")                             \
-  template(isAuthorized_name,                         "isAuthorized")                             \
   template(getClassContext_name,                      "getClassContext")                          \
   template(wait_name,                                 "wait")                                     \
   template(checkPackageAccess_name,                   "checkPackageAccess")                       \
-  template(stackSize_name,                            "stackSize")                                \
-  template(thread_id_name,                            "tid")                                      \
   template(newInstance0_name,                         "newInstance0")                             \
-  template(limit_name,                                "limit")                                    \
-  template(member_name,                               "member")                                   \
   template(forName_name,                              "forName")                                  \
   template(forName0_name,                             "forName0")                                 \
   template(isJavaIdentifierStart_name,                "isJavaIdentifierStart")                    \
   template(isJavaIdentifierPart_name,                 "isJavaIdentifierPart")                     \
-  template(exclusive_owner_thread_name,               "exclusiveOwnerThread")                     \
-  template(park_blocker_name,                         "parkBlocker")                              \
-  template(park_event_name,                           "nativeParkEventPointer")                   \
   template(cache_field_name,                          "cache")                                    \
   template(value_name,                                "value")                                    \
-  template(hash_name,                                 "hash")                                     \
-  template(coder_name,                                "coder")                                    \
   template(compact_strings_name,                      "COMPACT_STRINGS")                          \
   template(numberOfLeadingZeros_name,                 "numberOfLeadingZeros")                     \
   template(numberOfTrailingZeros_name,                "numberOfTrailingZeros")                    \
@@ -420,27 +403,17 @@
   template(method_name,                               "method")                                   \
   template(vmindex_name,                              "vmindex")                                  \
   template(vmcount_name,                              "vmcount")                                  \
-  template(vmentry_name,                              "vmentry")                                  \
   template(flags_name,                                "flags")                                    \
-  template(rtype_name,                                "rtype")                                    \
-  template(ptypes_name,                               "ptypes")                                   \
-  template(form_name,                                 "form")                                     \
   template(basicType_name,                            "basicType")                                \
   template(append_name,                               "append")                                   \
   template(klass_name,                                "klass")                                    \
   template(array_klass_name,                          "array_klass")                              \
-  template(memberName_name,                           "memberName")                               \
   template(mid_name,                                  "mid")                                      \
   template(cpref_name,                                "cpref")                                    \
   template(version_name,                              "version")                                  \
-  template(bci_name,                                  "bci")                                      \
   template(methodName_name,                           "methodName")                               \
   template(fileName_name,                             "fileName")                                 \
   template(lineNumber_name,                           "lineNumber")                               \
-  template(monitors_name,                             "monitors")                                 \
-  template(locals_name,                               "locals")                                   \
-  template(operands_name,                             "operands")                                 \
-  template(mode_name,                                 "mode")                                     \
   template(oop_size_name,                             "oop_size")                                 \
   template(static_oop_field_count_name,               "static_oop_field_count")                   \
   template(protection_domain_name,                    "protection_domain")                        \
@@ -448,9 +421,11 @@
   template(loader_data_name,                          "loader_data")                              \
   template(vmdependencies_name,                       "vmdependencies")                           \
   template(loader_name,                               "loader")                                   \
-  template(module_name,                               "module")                                   \
   template(getModule_name,                            "getModule")                                \
   template(input_stream_void_signature,               "(Ljava/io/InputStream;)V")                 \
+  template(input_stream_signature,                    "Ljava/io/InputStream;")                    \
+  template(print_stream_signature,                    "Ljava/io/PrintStream;")                    \
+  template(security_manager_signature,                "Ljava/lang/SecurityManager;")              \
   template(definePackage_name,                        "definePackage")                            \
   template(definePackage_signature,                   "(Ljava/lang/String;Ljava/lang/Module;)Ljava/lang/Package;") \
   template(defineOrCheckPackage_name,                 "defineOrCheckPackage")                     \
@@ -499,6 +474,7 @@
   template(short_signature,                           "S")                                        \
   template(bool_signature,                            "Z")                                        \
   template(void_signature,                            "V")                                        \
+  template(bool_array_signature,                      "[Z")                                       \
   template(byte_array_signature,                      "[B")                                       \
   template(char_array_signature,                      "[C")                                       \
   template(int_array_signature,                       "[I")                                       \
@@ -553,6 +529,7 @@
   template(object_array_signature,                    "[Ljava/lang/Object;")                                      \
   template(class_signature,                           "Ljava/lang/Class;")                                        \
   template(string_signature,                          "Ljava/lang/String;")                                       \
+  template(string_array_signature,                    "[Ljava/lang/String;")                                      \
   template(reference_signature,                       "Ljava/lang/ref/Reference;")                                \
   template(sun_misc_Cleaner_signature,                "Lsun/misc/Cleaner;")                                       \
   template(executable_signature,                      "Ljava/lang/reflect/Executable;")                           \
@@ -579,12 +556,6 @@
   /* used by ClassFormatError when class name is not known yet */                                                 \
   template(unknown_class_name,                        "<Unknown>")                                                \
                                                                                                                   \
-  /* used to identify class loaders handling parallel class loading */                                            \
-  template(parallelCapable_name,                      "parallelLockMap")                                          \
-                                                                                                                  \
-  /* used to return a class loader's unnamed module */                                                            \
-  template(unnamedModule_name,                        "unnamedModule")                                            \
-                                                                                                                  \
   /* JVM monitoring and management support */                                                                     \
   template(java_lang_StackTraceElement_array,          "[Ljava/lang/StackTraceElement;")                          \
   template(java_lang_management_ThreadState,           "java/lang/management/ThreadState")                        \
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/gc/g1/g1CollectedHeap.cpp
--- a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -445,9 +445,7 @@
   assert_heap_not_locked_and_not_at_safepoint();
   assert(!is_humongous(word_size), "we do not allow humongous TLABs");
 
-  uint dummy_gc_count_before;
-  uint dummy_gclocker_retry_count = 0;
-  return attempt_allocation(word_size, &dummy_gc_count_before, &dummy_gclocker_retry_count);
+  return attempt_allocation(word_size);
 }
 
 HeapWord*
@@ -455,62 +453,16 @@
                               bool*  gc_overhead_limit_was_exceeded) {
   assert_heap_not_locked_and_not_at_safepoint();
 
-  // Loop until the allocation is satisfied, or unsatisfied after GC.
-  for (uint try_count = 1, gclocker_retry_count = 0; /* we'll return */; try_count += 1) {
-    uint gc_count_before;
-
-    HeapWord* result = NULL;
-    if (!is_humongous(word_size)) {
-      result = attempt_allocation(word_size, &gc_count_before, &gclocker_retry_count);
-    } else {
-      result = attempt_allocation_humongous(word_size, &gc_count_before, &gclocker_retry_count);
-    }
-    if (result != NULL) {
-      return result;
-    }
-
-    // Create the garbage collection operation...
-    VM_G1CollectForAllocation op(gc_count_before, word_size);
-    op.set_allocation_context(AllocationContext::current());
-
-    // ...and get the VM thread to execute it.
-    VMThread::execute(&op);
-
-    if (op.prologue_succeeded() && op.pause_succeeded()) {
-      // If the operation was successful we'll return the result even
-      // if it is NULL. If the allocation attempt failed immediately
-      // after a Full GC, it's unlikely we'll be able to allocate now.
-      HeapWord* result = op.result();
-      if (result != NULL && !is_humongous(word_size)) {
-        // Allocations that take place on VM operations do not do any
-        // card dirtying and we have to do it here. We only have to do
-        // this for non-humongous allocations, though.
-        dirty_young_block(result, word_size);
-      }
-      return result;
-    } else {
-      if (gclocker_retry_count > GCLockerRetryAllocationCount) {
-        return NULL;
-      }
-      assert(op.result() == NULL,
-             "the result should be NULL if the VM op did not succeed");
-    }
-
-    // Give a warning if we seem to be looping forever.
-    if ((QueuedAllocationWarningCount > 0) &&
-        (try_count % QueuedAllocationWarningCount == 0)) {
-      log_warning(gc)("G1CollectedHeap::mem_allocate retries %d times", try_count);
-    }
+  if (is_humongous(word_size)) {
+    return attempt_allocation_humongous(word_size);
   }
-
-  ShouldNotReachHere();
-  return NULL;
+  return attempt_allocation(word_size);
 }
 
 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size,
-                                                   AllocationContext_t context,
-                                                   uint* gc_count_before_ret,
-                                                   uint* gclocker_retry_count_ret) {
+                                                   AllocationContext_t context) {
+  ResourceMark rm; // For retrieving the thread names in log messages.
+
   // Make sure you read the note in attempt_allocation_humongous().
 
   assert_heap_not_locked_and_not_at_safepoint();
@@ -525,7 +477,7 @@
   // fails to perform the allocation. b) is the only case when we'll
   // return NULL.
   HeapWord* result = NULL;
-  for (int try_count = 1; /* we'll return */; try_count += 1) {
+  for (uint try_count = 1, gclocker_retry_count = 0; /* we'll return */; try_count += 1) {
     bool should_try_gc;
     uint gc_count_before;
 
@@ -536,30 +488,23 @@
         return result;
       }
 
-      if (GCLocker::is_active_and_needs_gc()) {
-        if (g1_policy()->can_expand_young_list()) {
-          // No need for an ergo verbose message here,
-          // can_expand_young_list() does this when it returns true.
-          result = _allocator->attempt_allocation_force(word_size, context);
-          if (result != NULL) {
-            return result;
-          }
-        }
-        should_try_gc = false;
-      } else {
-        // The GCLocker may not be active but the GCLocker initiated
-        // GC may not yet have been performed (GCLocker::needs_gc()
-        // returns true). In this case we do not try this GC and
-        // wait until the GCLocker initiated GC is performed, and
-        // then retry the allocation.
-        if (GCLocker::needs_gc()) {
-          should_try_gc = false;
-        } else {
-          // Read the GC count while still holding the Heap_lock.
-          gc_count_before = total_collections();
-          should_try_gc = true;
+      // If the GCLocker is active and we are bound for a GC, try expanding young gen.
+      // This is different to when only GCLocker::needs_gc() is set: try to avoid
+      // waiting because the GCLocker is active to not wait too long.
+      if (GCLocker::is_active_and_needs_gc() && g1_policy()->can_expand_young_list()) {
+        // No need for an ergo message here, can_expand_young_list() does this when
+        // it returns true.
+        result = _allocator->attempt_allocation_force(word_size, context);
+        if (result != NULL) {
+          return result;
         }
       }
+      // Only try a GC if the GCLocker does not signal the need for a GC. Wait until
+      // the GCLocker initiated GC has been performed and then retry. This includes
+      // the case when the GC Locker is not active but has not been performed.
+      should_try_gc = !GCLocker::needs_gc();
+      // Read the GC count while still holding the Heap_lock.
+      gc_count_before = total_collections();
     }
 
     if (should_try_gc) {
@@ -568,28 +513,33 @@
                                    GCCause::_g1_inc_collection_pause);
       if (result != NULL) {
         assert(succeeded, "only way to get back a non-NULL result");
+        log_trace(gc, alloc)("%s: Successfully scheduled collection returning " PTR_FORMAT,
+                             Thread::current()->name(), p2i(result));
         return result;
       }
 
       if (succeeded) {
-        // If we get here we successfully scheduled a collection which
-        // failed to allocate. No point in trying to allocate
-        // further. We'll just return NULL.
-        MutexLockerEx x(Heap_lock);
-        *gc_count_before_ret = total_collections();
+        // We successfully scheduled a collection which failed to allocate. No
+        // point in trying to allocate further. We'll just return NULL.
+        log_trace(gc, alloc)("%s: Successfully scheduled collection failing to allocate "
+                             SIZE_FORMAT " words", Thread::current()->name(), word_size);
         return NULL;
       }
+      log_trace(gc, alloc)("%s: Unsuccessfully scheduled collection allocating " SIZE_FORMAT " words",
+                           Thread::current()->name(), word_size);
     } else {
-      if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) {
-        MutexLockerEx x(Heap_lock);
-        *gc_count_before_ret = total_collections();
+      // Failed to schedule a collection.
+      if (gclocker_retry_count > GCLockerRetryAllocationCount) {
+        log_warning(gc, alloc)("%s: Retried waiting for GCLocker too often allocating "
+                               SIZE_FORMAT " words", Thread::current()->name(), word_size);
         return NULL;
       }
+      log_trace(gc, alloc)("%s: Stall until clear", Thread::current()->name());
       // The GCLocker is either active or the GCLocker initiated
       // GC has not yet been performed. Stall until it is and
       // then retry the allocation.
       GCLocker::stall_until_clear();
-      (*gclocker_retry_count_ret) += 1;
+      gclocker_retry_count += 1;
     }
 
     // We can reach here if we were unsuccessful in scheduling a
@@ -600,6 +550,7 @@
     // first attempt (without holding the Heap_lock) here and the
     // follow-on attempt will be at the start of the next loop
     // iteration (after taking the Heap_lock).
+
     result = _allocator->attempt_allocation(word_size, context);
     if (result != NULL) {
       return result;
@@ -608,8 +559,8 @@
     // Give a warning if we seem to be looping forever.
     if ((QueuedAllocationWarningCount > 0) &&
         (try_count % QueuedAllocationWarningCount == 0)) {
-      log_warning(gc)("G1CollectedHeap::attempt_allocation_slow() "
-                      "retries %d times", try_count);
+      log_warning(gc, alloc)("%s:  Retried allocation %u times for " SIZE_FORMAT " words",
+                             Thread::current()->name(), try_count, word_size);
     }
   }
 
@@ -830,9 +781,7 @@
   }
 }
 
-inline HeapWord* G1CollectedHeap::attempt_allocation(size_t word_size,
-                                                     uint* gc_count_before_ret,
-                                                     uint* gclocker_retry_count_ret) {
+inline HeapWord* G1CollectedHeap::attempt_allocation(size_t word_size) {
   assert_heap_not_locked_and_not_at_safepoint();
   assert(!is_humongous(word_size), "attempt_allocation() should not "
          "be called for humongous allocation requests");
@@ -841,10 +790,7 @@
   HeapWord* result = _allocator->attempt_allocation(word_size, context);
 
   if (result == NULL) {
-    result = attempt_allocation_slow(word_size,
-                                     context,
-                                     gc_count_before_ret,
-                                     gclocker_retry_count_ret);
+    result = attempt_allocation_slow(word_size, context);
   }
   assert_heap_not_locked();
   if (result != NULL) {
@@ -925,9 +871,9 @@
   decrease_used(size_used);
 }
 
-HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size,
-                                                        uint* gc_count_before_ret,
-                                                        uint* gclocker_retry_count_ret) {
+HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size) {
+  ResourceMark rm; // For retrieving the thread names in log messages.
+
   // The structure of this method has a lot of similarities to
   // attempt_allocation_slow(). The reason these two were not merged
   // into a single one is that such a method would require several "if
@@ -958,10 +904,11 @@
   // fails to perform the allocation. b) is the only case when we'll
   // return NULL.
   HeapWord* result = NULL;
-  for (int try_count = 1; /* we'll return */; try_count += 1) {
+  for (uint try_count = 1, gclocker_retry_count = 0; /* we'll return */; try_count += 1) {
     bool should_try_gc;
     uint gc_count_before;
 
+
     {
       MutexLockerEx x(Heap_lock);
 
@@ -975,69 +922,63 @@
         return result;
       }
 
-      if (GCLocker::is_active_and_needs_gc()) {
-        should_try_gc = false;
-      } else {
-         // The GCLocker may not be active but the GCLocker initiated
-        // GC may not yet have been performed (GCLocker::needs_gc()
-        // returns true). In this case we do not try this GC and
-        // wait until the GCLocker initiated GC is performed, and
-        // then retry the allocation.
-        if (GCLocker::needs_gc()) {
-          should_try_gc = false;
-        } else {
-          // Read the GC count while still holding the Heap_lock.
-          gc_count_before = total_collections();
-          should_try_gc = true;
-        }
-      }
+      // Only try a GC if the GCLocker does not signal the need for a GC. Wait until
+      // the GCLocker initiated GC has been performed and then retry. This includes
+      // the case when the GC Locker is not active but has not been performed.
+      should_try_gc = !GCLocker::needs_gc();
+      // Read the GC count while still holding the Heap_lock.
+      gc_count_before = total_collections();
     }
 
     if (should_try_gc) {
-      // If we failed to allocate the humongous object, we should try to
-      // do a collection pause (if we're allowed) in case it reclaims
-      // enough space for the allocation to succeed after the pause.
-
       bool succeeded;
       result = do_collection_pause(word_size, gc_count_before, &succeeded,
                                    GCCause::_g1_humongous_allocation);
       if (result != NULL) {
         assert(succeeded, "only way to get back a non-NULL result");
+        log_trace(gc, alloc)("%s: Successfully scheduled collection returning " PTR_FORMAT,
+                             Thread::current()->name(), p2i(result));
         return result;
       }
 
       if (succeeded) {
-        // If we get here we successfully scheduled a collection which
-        // failed to allocate. No point in trying to allocate
-        // further. We'll just return NULL.
-        MutexLockerEx x(Heap_lock);
-        *gc_count_before_ret = total_collections();
+        // We successfully scheduled a collection which failed to allocate. No
+        // point in trying to allocate further. We'll just return NULL.
+        log_trace(gc, alloc)("%s: Successfully scheduled collection failing to allocate "
+                             SIZE_FORMAT " words", Thread::current()->name(), word_size);
         return NULL;
       }
+      log_trace(gc, alloc)("%s: Unsuccessfully scheduled collection allocating " SIZE_FORMAT "",
+                           Thread::current()->name(), word_size);
     } else {
-      if (*gclocker_retry_count_ret > GCLockerRetryAllocationCount) {
-        MutexLockerEx x(Heap_lock);
-        *gc_count_before_ret = total_collections();
+      // Failed to schedule a collection.
+      if (gclocker_retry_count > GCLockerRetryAllocationCount) {
+        log_warning(gc, alloc)("%s: Retried waiting for GCLocker too often allocating "
+                               SIZE_FORMAT " words", Thread::current()->name(), word_size);
         return NULL;
       }
+      log_trace(gc, alloc)("%s: Stall until clear", Thread::current()->name());
       // The GCLocker is either active or the GCLocker initiated
       // GC has not yet been performed. Stall until it is and
       // then retry the allocation.
       GCLocker::stall_until_clear();
-      (*gclocker_retry_count_ret) += 1;
+      gclocker_retry_count += 1;
     }
 
+
     // We can reach here if we were unsuccessful in scheduling a
     // collection (because another thread beat us to it) or if we were
     // stalled due to the GC locker. In either can we should retry the
     // allocation attempt in case another thread successfully
-    // performed a collection and reclaimed enough space.  Give a
-    // warning if we seem to be looping forever.
+    // performed a collection and reclaimed enough space.
+    // Humongous object allocation always needs a lock, so we wait for the retry
+    // in the next iteration of the loop, unlike for the regular iteration case.
+    // Give a warning if we seem to be looping forever.
 
     if ((QueuedAllocationWarningCount > 0) &&
         (try_count % QueuedAllocationWarningCount == 0)) {
-      log_warning(gc)("G1CollectedHeap::attempt_allocation_humongous() "
-                      "retries %d times", try_count);
+      log_warning(gc, alloc)("%s: Retried allocation %u times for " SIZE_FORMAT " words",
+                             Thread::current()->name(), try_count, word_size);
     }
   }
 
@@ -1339,7 +1280,6 @@
                                     context,
                                     expect_null_mutator_alloc_region);
   if (result != NULL) {
-    assert(*gc_succeeded, "sanity");
     return result;
   }
 
@@ -1349,7 +1289,6 @@
   // do something smarter than full collection to satisfy a failed alloc.)
   result = expand_and_allocate(word_size, context);
   if (result != NULL) {
-    assert(*gc_succeeded, "sanity");
     return result;
   }
 
@@ -1401,7 +1340,6 @@
                                             succeeded);
 
   if (result != NULL) {
-    assert(*succeeded, "sanity");
     return result;
   }
 
@@ -1412,7 +1350,6 @@
   // space available is large enough for the allocation, then a more
   // complete compaction phase than we've tried so far might be
   // appropriate.
-  assert(*succeeded, "sanity");
   return NULL;
 }
 
@@ -2147,7 +2084,7 @@
   // This notify_all() will ensure that a thread that called
   // System.gc() with (with ExplicitGCInvokesConcurrent set or not)
   // and it's waiting for a full GC to finish will be woken up. It is
-  // waiting in VM_G1IncCollectionPause::doit_epilogue().
+  // waiting in VM_G1CollectForAllocation::doit_epilogue().
   FullGCCount_lock->notify_all();
 }
 
@@ -2175,13 +2112,12 @@
       // Schedule an initial-mark evacuation pause that will start a
       // concurrent cycle. We're setting word_size to 0 which means that
       // we are not requesting a post-GC allocation.
-      VM_G1IncCollectionPause op(gc_count_before,
-                                 0,     /* word_size */
-                                 true,  /* should_initiate_conc_mark */
-                                 g1_policy()->max_pause_time_ms(),
-                                 cause);
-      op.set_allocation_context(AllocationContext::current());
-
+      VM_G1CollectForAllocation op(0,     /* word_size */
+                                   gc_count_before,
+                                   cause,
+                                   true,  /* should_initiate_conc_mark */
+                                   g1_policy()->max_pause_time_ms(),
+                                   AllocationContext::current());
       VMThread::execute(&op);
       if (!op.pause_succeeded()) {
         if (old_marking_count_before == _old_marking_cycles_started) {
@@ -2204,11 +2140,12 @@
 
         // Schedule a standard evacuation pause. We're setting word_size
         // to 0 which means that we are not requesting a post-GC allocation.
-        VM_G1IncCollectionPause op(gc_count_before,
-                                   0,     /* word_size */
-                                   false, /* should_initiate_conc_mark */
-                                   g1_policy()->max_pause_time_ms(),
-                                   cause);
+        VM_G1CollectForAllocation op(0,     /* word_size */
+                                     gc_count_before,
+                                     cause,
+                                     false, /* should_initiate_conc_mark */
+                                     g1_policy()->max_pause_time_ms(),
+                                     AllocationContext::current());
         VMThread::execute(&op);
       } else {
         // Schedule a Full GC.
@@ -2619,13 +2556,12 @@
                                                bool* succeeded,
                                                GCCause::Cause gc_cause) {
   assert_heap_not_locked_and_not_at_safepoint();
-  VM_G1IncCollectionPause op(gc_count_before,
-                             word_size,
-                             false, /* should_initiate_conc_mark */
-                             g1_policy()->max_pause_time_ms(),
-                             gc_cause);
-
-  op.set_allocation_context(AllocationContext::current());
+  VM_G1CollectForAllocation op(word_size,
+                               gc_count_before,
+                               gc_cause,
+                               false, /* should_initiate_conc_mark */
+                               g1_policy()->max_pause_time_ms(),
+                               AllocationContext::current());
   VMThread::execute(&op);
 
   HeapWord* result = op.result();
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/gc/g1/g1CollectedHeap.hpp
--- a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -125,7 +125,6 @@
   friend class VM_CollectForMetadataAllocation;
   friend class VM_G1CollectForAllocation;
   friend class VM_G1CollectFull;
-  friend class VM_G1IncCollectionPause;
   friend class VMStructs;
   friend class MutatorAllocRegion;
   friend class G1FullCollector;
@@ -454,35 +453,20 @@
   virtual HeapWord* mem_allocate(size_t word_size,
                                  bool*  gc_overhead_limit_was_exceeded);
 
-  // The following three methods take a gc_count_before_ret
-  // parameter which is used to return the GC count if the method
-  // returns NULL. Given that we are required to read the GC count
-  // while holding the Heap_lock, and these paths will take the
-  // Heap_lock at some point, it's easier to get them to read the GC
-  // count while holding the Heap_lock before they return NULL instead
-  // of the caller (namely: mem_allocate()) having to also take the
-  // Heap_lock just to read the GC count.
-
   // First-level mutator allocation attempt: try to allocate out of
   // the mutator alloc region without taking the Heap_lock. This
   // should only be used for non-humongous allocations.
-  inline HeapWord* attempt_allocation(size_t word_size,
-                                      uint* gc_count_before_ret,
-                                      uint* gclocker_retry_count_ret);
+  inline HeapWord* attempt_allocation(size_t word_size);
 
   // Second-level mutator allocation attempt: take the Heap_lock and
   // retry the allocation attempt, potentially scheduling a GC
   // pause. This should only be used for non-humongous allocations.
   HeapWord* attempt_allocation_slow(size_t word_size,
-                                    AllocationContext_t context,
-                                    uint* gc_count_before_ret,
-                                    uint* gclocker_retry_count_ret);
+                                    AllocationContext_t context);
 
   // Takes the Heap_lock and attempts a humongous allocation. It can
   // potentially schedule a GC pause.
-  HeapWord* attempt_allocation_humongous(size_t word_size,
-                                         uint* gc_count_before_ret,
-                                         uint* gclocker_retry_count_ret);
+  HeapWord* attempt_allocation_humongous(size_t word_size);
 
   // Allocation attempt that should be called during safepoints (e.g.,
   // at the end of a successful GC). expect_null_mutator_alloc_region
@@ -1078,6 +1062,11 @@
     return _hrm.available() == 0;
   }
 
+  // Returns whether there are any regions left in the heap for allocation.
+  bool has_regions_left_for_allocation() const {
+    return !is_maximal_no_gc() || num_free_regions() != 0;
+  }
+
   // The current number of regions in the heap.
   uint num_regions() const { return _hrm.length(); }
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/gc/g1/g1OopClosures.inline.hpp
--- a/src/hotspot/share/gc/g1/g1OopClosures.inline.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/gc/g1/g1OopClosures.inline.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -33,6 +33,7 @@
 #include "gc/g1/heapRegion.inline.hpp"
 #include "gc/g1/heapRegionRemSet.hpp"
 #include "memory/iterator.inline.hpp"
+#include "oops/access.inline.hpp"
 #include "runtime/prefetch.inline.hpp"
 
 template <class T>
@@ -87,13 +88,13 @@
 
 template <class T>
 inline void G1CMOopClosure::do_oop_nv(T* p) {
-  oop obj = oopDesc::load_decode_heap_oop(p);
+  oop obj = RawAccess<MO_VOLATILE>::oop_load(p);
   _task->deal_with_reference(obj);
 }
 
 template <class T>
 inline void G1RootRegionScanClosure::do_oop_nv(T* p) {
-  T heap_oop = oopDesc::load_heap_oop(p);
+  T heap_oop = RawAccess<MO_VOLATILE>::oop_load(p);
   if (oopDesc::is_null(heap_oop)) {
     return;
   }
@@ -124,7 +125,7 @@
 
 template <class T>
 inline void G1ConcurrentRefineOopClosure::do_oop_nv(T* p) {
-  T o = oopDesc::load_heap_oop(p);
+  T o = RawAccess<MO_VOLATILE>::oop_load(p);
   if (oopDesc::is_null(o)) {
     return;
   }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/gc/g1/g1SATBCardTableModRefBS.inline.hpp
--- a/src/hotspot/share/gc/g1/g1SATBCardTableModRefBS.inline.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/gc/g1/g1SATBCardTableModRefBS.inline.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,7 +27,6 @@
 
 #include "gc/shared/accessBarrierSupport.inline.hpp"
 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
-#include "oops/oop.inline.hpp"
 
 template <DecoratorSet decorators, typename T>
 inline void G1SATBCardTableModRefBS::write_ref_field_pre(T* field) {
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/gc/g1/vm_operations_g1.cpp
--- a/src/hotspot/share/gc/g1/vm_operations_g1.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/gc/g1/vm_operations_g1.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,34 +33,21 @@
 #include "gc/shared/isGCActiveMark.hpp"
 #include "runtime/interfaceSupport.hpp"
 
-VM_G1CollectForAllocation::VM_G1CollectForAllocation(uint gc_count_before,
-                                                     size_t word_size)
-  : VM_G1OperationWithAllocRequest(gc_count_before, word_size,
-                                   GCCause::_allocation_failure) {
-  guarantee(word_size != 0, "An allocation should always be requested with this operation.");
-}
-
-void VM_G1CollectForAllocation::doit() {
-  G1CollectedHeap* g1h = G1CollectedHeap::heap();
-  GCCauseSetter x(g1h, _gc_cause);
-
-  _result = g1h->satisfy_failed_allocation(_word_size, allocation_context(), &_pause_succeeded);
-  assert(_result == NULL || _pause_succeeded,
-         "if we get back a result, the pause should have succeeded");
-}
-
 void VM_G1CollectFull::doit() {
   G1CollectedHeap* g1h = G1CollectedHeap::heap();
   GCCauseSetter x(g1h, _gc_cause);
   g1h->do_full_collection(false /* clear_all_soft_refs */);
 }
 
-VM_G1IncCollectionPause::VM_G1IncCollectionPause(uint           gc_count_before,
-                                                 size_t         word_size,
-                                                 bool           should_initiate_conc_mark,
-                                                 double         target_pause_time_ms,
-                                                 GCCause::Cause gc_cause)
-  : VM_G1OperationWithAllocRequest(gc_count_before, word_size, gc_cause),
+VM_G1CollectForAllocation::VM_G1CollectForAllocation(size_t         word_size,
+                                                     uint           gc_count_before,
+                                                     GCCause::Cause gc_cause,
+                                                     bool           should_initiate_conc_mark,
+                                                     double         target_pause_time_ms,
+                                                     AllocationContext_t allocation_context)
+  : VM_CollectForAllocation(word_size, gc_count_before, gc_cause),
+    _pause_succeeded(false),
+    _allocation_context(allocation_context),
     _should_initiate_conc_mark(should_initiate_conc_mark),
     _target_pause_time_ms(target_pause_time_ms),
     _should_retry_gc(false),
@@ -71,8 +58,8 @@
   _gc_cause = gc_cause;
 }
 
-bool VM_G1IncCollectionPause::doit_prologue() {
-  bool res = VM_G1OperationWithAllocRequest::doit_prologue();
+bool VM_G1CollectForAllocation::doit_prologue() {
+  bool res = VM_CollectForAllocation::doit_prologue();
   if (!res) {
     if (_should_initiate_conc_mark) {
       // The prologue can fail for a couple of reasons. The first is that another GC
@@ -87,7 +74,7 @@
   return res;
 }
 
-void VM_G1IncCollectionPause::doit() {
+void VM_G1CollectForAllocation::doit() {
   G1CollectedHeap* g1h = G1CollectedHeap::heap();
   assert(!_should_initiate_conc_mark || g1h->should_do_concurrent_full_gc(_gc_cause),
       "only a GC locker, a System.gc(), stats update, whitebox, or a hum allocation induced GC should start a cycle");
@@ -95,7 +82,7 @@
   if (_word_size > 0) {
     // An allocation has been requested. So, try to do that first.
     _result = g1h->attempt_allocation_at_safepoint(_word_size,
-                                                   allocation_context(),
+                                                   _allocation_context,
                                                    false /* expect_null_cur_alloc_region */);
     if (_result != NULL) {
       // If we can successfully allocate before we actually do the
@@ -144,27 +131,34 @@
     }
   }
 
-  _pause_succeeded =
-    g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
-  if (_pause_succeeded && _word_size > 0) {
-    // An allocation had been requested.
-    _result = g1h->attempt_allocation_at_safepoint(_word_size,
-                                                   allocation_context(),
-                                                   true /* expect_null_cur_alloc_region */);
+  // Try a partial collection of some kind.
+  _pause_succeeded = g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
+
+  if (_pause_succeeded) {
+    if (_word_size > 0) {
+      // An allocation had been requested. Do it, eventually trying a stronger
+      // kind of GC.
+      _result = g1h->satisfy_failed_allocation(_word_size, _allocation_context, &_pause_succeeded);
+    } else if (!g1h->has_regions_left_for_allocation()) {
+      // There has been a request to perform a GC to free some space. We have no
+      // information on how much memory has been asked for. In case there are
+      // absolutely no regions left to allocate into, do a maximally compacting full GC.
+      log_info(gc, ergo)("Attempting maximally compacting collection");
+      _pause_succeeded = g1h->do_full_collection(false, /* explicit gc */
+                                                 true   /* clear_all_soft_refs */);
+    }
+    guarantee(_pause_succeeded, "Elevated collections during the safepoint must always succeed.");
   } else {
     assert(_result == NULL, "invariant");
-    if (!_pause_succeeded) {
-      // Another possible reason reason for the pause to not be successful
-      // is that, again, the GC locker is active (and has become active
-      // since the prologue was executed). In this case we should retry
-      // the pause after waiting for the GC locker to become inactive.
-      _should_retry_gc = true;
-    }
+    // The only reason for the pause to not be successful is that, the GC locker is
+    // active (or has become active since the prologue was executed). In this case
+    // we should retry the pause after waiting for the GC locker to become inactive.
+    _should_retry_gc = true;
   }
 }
 
-void VM_G1IncCollectionPause::doit_epilogue() {
-  VM_G1OperationWithAllocRequest::doit_epilogue();
+void VM_G1CollectForAllocation::doit_epilogue() {
+  VM_CollectForAllocation::doit_epilogue();
 
   // If the pause was initiated by a System.gc() and
   // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/gc/g1/vm_operations_g1.hpp
--- a/src/hotspot/share/gc/g1/vm_operations_g1.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/gc/g1/vm_operations_g1.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -32,26 +32,8 @@
 // VM_operations for the G1 collector.
 // VM_GC_Operation:
 //   - VM_CGC_Operation
+//   - VM_G1CollectForAllocation
 //   - VM_G1CollectFull
-//   - VM_G1OperationWithAllocRequest
-//     - VM_G1CollectForAllocation
-//     - VM_G1IncCollectionPause
-
-class VM_G1OperationWithAllocRequest : public VM_CollectForAllocation {
-protected:
-  bool      _pause_succeeded;
-  AllocationContext_t _allocation_context;
-
-public:
-  VM_G1OperationWithAllocRequest(uint           gc_count_before,
-                                 size_t         word_size,
-                                 GCCause::Cause gc_cause)
-    : VM_CollectForAllocation(word_size, gc_count_before, gc_cause),
-      _pause_succeeded(false) {}
-  bool pause_succeeded() { return _pause_succeeded; }
-  void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }
-  AllocationContext_t  allocation_context() { return _allocation_context; }
-};
 
 class VM_G1CollectFull: public VM_GC_Operation {
 public:
@@ -62,41 +44,35 @@
   virtual VMOp_Type type() const { return VMOp_G1CollectFull; }
   virtual void doit();
   virtual const char* name() const {
-    return "full garbage-first collection";
+    return "G1 Full collection";
   }
 };
 
-class VM_G1CollectForAllocation: public VM_G1OperationWithAllocRequest {
-public:
-  VM_G1CollectForAllocation(uint         gc_count_before,
-                            size_t       word_size);
-  virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
-  virtual void doit();
-  virtual const char* name() const {
-    return "garbage-first collection to satisfy allocation";
-  }
-};
+class VM_G1CollectForAllocation: public VM_CollectForAllocation {
+private:
+  bool      _pause_succeeded;
+  AllocationContext_t _allocation_context;
 
-class VM_G1IncCollectionPause: public VM_G1OperationWithAllocRequest {
-private:
   bool         _should_initiate_conc_mark;
   bool         _should_retry_gc;
   double       _target_pause_time_ms;
   uint         _old_marking_cycles_completed_before;
 public:
-  VM_G1IncCollectionPause(uint           gc_count_before,
-                          size_t         word_size,
-                          bool           should_initiate_conc_mark,
-                          double         target_pause_time_ms,
-                          GCCause::Cause gc_cause);
-  virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }
+  VM_G1CollectForAllocation(size_t         word_size,
+                            uint           gc_count_before,
+                            GCCause::Cause gc_cause,
+                            bool           should_initiate_conc_mark,
+                            double         target_pause_time_ms,
+                            AllocationContext_t allocation_context);
+  virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
   virtual bool doit_prologue();
   virtual void doit();
   virtual void doit_epilogue();
   virtual const char* name() const {
-    return "garbage-first incremental collection pause";
+    return "G1 collect for allocation";
   }
   bool should_retry_gc() const { return _should_retry_gc; }
+  bool pause_succeeded() { return _pause_succeeded; }
 };
 
 // Concurrent GC stop-the-world operations such as remark and cleanup;
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/gc/shared/barrierSet.hpp
--- a/src/hotspot/share/gc/shared/barrierSet.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/gc/shared/barrierSet.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -147,9 +147,8 @@
   // 3) Provide specializations for BarrierSet::GetName and BarrierSet::GetType.
   template <DecoratorSet decorators, typename BarrierSetT>
   class AccessBarrier: protected RawAccessBarrier<decorators> {
-  protected:
+  private:
     typedef RawAccessBarrier<decorators> Raw;
-    typedef typename BarrierSetT::template AccessBarrier<decorators> CRTPAccessBarrier;
 
   public:
     // Primitive heap accesses. These accessors get resolved when
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/jvmci/jvmciJavaClasses.hpp
--- a/src/hotspot/share/jvmci/jvmciJavaClasses.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/jvmci/jvmciJavaClasses.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -351,7 +351,7 @@
     static type name() {                                                                                       \
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       oop result = HeapAccess<>::oop_load((HeapWord*)addr);                                                    \
       return type(result);                                                                                     \
     }                                                                                                          \
@@ -359,7 +359,7 @@
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       assert(klassName::klass() != NULL, "Class not yet loaded: " #klassName);                                 \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       HeapAccess<>::oop_store((HeapWord*)addr, x);                                                             \
     }
 #define STATIC_PRIMITIVE_FIELD(klassName, name, jtypename)                                                     \
@@ -367,13 +367,13 @@
     static jtypename name() {                                                                                  \
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       return HeapAccess<>::load((jtypename*)addr);                                                             \
     }                                                                                                          \
     static void set_##name(jtypename x) {                                                                      \
       assert(klassName::klass() != NULL && klassName::klass()->is_linked(), "Class not yet linked: " #klassName); \
       InstanceKlass* ik = klassName::klass();                                                                  \
-      address addr = ik->static_field_addr(_##name##_offset - InstanceMirrorKlass::offset_of_static_fields()); \
+      address addr = ik->static_field_addr(_##name##_offset);                                                  \
       HeapAccess<>::store((jtypename*)addr, x);                                                                \
     }
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/access.hpp
--- a/src/hotspot/share/oops/access.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/access.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -342,7 +342,7 @@
   template <DecoratorSet expected_mo_decorators>
   static void verify_primitive_decorators() {
     const DecoratorSet primitive_decorators = (AS_DECORATOR_MASK ^ AS_NO_KEEPALIVE) | IN_HEAP |
-                                               IN_HEAP_ARRAY | MO_DECORATOR_MASK;
+                                               IN_HEAP_ARRAY;
     verify_decorators<expected_mo_decorators | primitive_decorators>();
   }
 
@@ -350,7 +350,7 @@
   static void verify_oop_decorators() {
     const DecoratorSet oop_decorators = AS_DECORATOR_MASK | IN_DECORATOR_MASK |
                                         (ON_DECORATOR_MASK ^ ON_UNKNOWN_OOP_REF) | // no unknown oop refs outside of the heap
-                                        OOP_DECORATOR_MASK | MO_DECORATOR_MASK;
+                                        OOP_DECORATOR_MASK;
     verify_decorators<expected_mo_decorators | oop_decorators>();
   }
 
@@ -358,8 +358,7 @@
   static void verify_heap_oop_decorators() {
     const DecoratorSet heap_oop_decorators = AS_DECORATOR_MASK | ON_DECORATOR_MASK |
                                              OOP_DECORATOR_MASK | (IN_DECORATOR_MASK ^
-                                                                  (IN_ROOT ^ IN_CONCURRENT_ROOT)) | // no root accesses in the heap
-                                             MO_DECORATOR_MASK;
+                                                                   (IN_ROOT | IN_CONCURRENT_ROOT)); // no root accesses in the heap
     verify_decorators<expected_mo_decorators | heap_oop_decorators>();
   }
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/access.inline.hpp
--- a/src/hotspot/share/oops/access.inline.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/access.inline.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -491,11 +491,12 @@
   // not possible.
   struct PreRuntimeDispatch: AllStatic {
     template<DecoratorSet decorators>
-    static bool can_hardwire_raw() {
-      return !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value || // primitive access
-             !HasDecorator<decorators, INTERNAL_CONVERT_COMPRESSED_OOP>::value || // don't care about compressed oops (oop* address)
-             HasDecorator<decorators, INTERNAL_RT_USE_COMPRESSED_OOPS>::value; // we can infer we use compressed oops (narrowOop* address)
-    }
+    struct CanHardwireRaw: public IntegralConstant<
+      bool,
+      !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value || // primitive access
+      !HasDecorator<decorators, INTERNAL_CONVERT_COMPRESSED_OOP>::value || // don't care about compressed oops (oop* address)
+      HasDecorator<decorators, INTERNAL_RT_USE_COMPRESSED_OOPS>::value> // we can infer we use compressed oops (narrowOop* address)
+    {};
 
     static const DecoratorSet convert_compressed_oops = INTERNAL_RT_USE_COMPRESSED_OOPS | INTERNAL_CONVERT_COMPRESSED_OOP;
 
@@ -507,16 +508,21 @@
 
     template <DecoratorSet decorators, typename T>
     inline static typename EnableIf<
-      HasDecorator<decorators, AS_RAW>::value>::type
+      HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value>::type
     store(void* addr, T value) {
       typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
-      if (can_hardwire_raw<decorators>()) {
-        if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
-          Raw::oop_store(addr, value);
-        } else {
-          Raw::store(addr, value);
-        }
-      } else if (UseCompressedOops) {
+      if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
+        Raw::oop_store(addr, value);
+      } else {
+        Raw::store(addr, value);
+      }
+    }
+
+    template <DecoratorSet decorators, typename T>
+    inline static typename EnableIf<
+      HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value>::type
+    store(void* addr, T value) {
+      if (UseCompressedOops) {
         const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
         PreRuntimeDispatch::store<expanded_decorators>(addr, value);
       } else {
@@ -558,16 +564,21 @@
 
     template <DecoratorSet decorators, typename T>
     inline static typename EnableIf<
-      HasDecorator<decorators, AS_RAW>::value, T>::type
+      HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
     load(void* addr) {
       typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
-      if (can_hardwire_raw<decorators>()) {
-        if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
-          return Raw::template oop_load<T>(addr);
-        } else {
-          return Raw::template load<T>(addr);
-        }
-      } else if (UseCompressedOops) {
+      if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
+        return Raw::template oop_load<T>(addr);
+      } else {
+        return Raw::template load<T>(addr);
+      }
+    }
+
+    template <DecoratorSet decorators, typename T>
+    inline static typename EnableIf<
+      HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
+    load(void* addr) {
+      if (UseCompressedOops) {
         const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
         return PreRuntimeDispatch::load<expanded_decorators, T>(addr);
       } else {
@@ -609,16 +620,21 @@
 
     template <DecoratorSet decorators, typename T>
     inline static typename EnableIf<
-      HasDecorator<decorators, AS_RAW>::value, T>::type
+      HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
     atomic_cmpxchg(T new_value, void* addr, T compare_value) {
       typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
-      if (can_hardwire_raw<decorators>()) {
-        if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
-          return Raw::oop_atomic_cmpxchg(new_value, addr, compare_value);
-        } else {
-          return Raw::atomic_cmpxchg(new_value, addr, compare_value);
-        }
-      } else if (UseCompressedOops) {
+      if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
+        return Raw::oop_atomic_cmpxchg(new_value, addr, compare_value);
+      } else {
+        return Raw::atomic_cmpxchg(new_value, addr, compare_value);
+      }
+    }
+
+    template <DecoratorSet decorators, typename T>
+    inline static typename EnableIf<
+      HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
+    atomic_cmpxchg(T new_value, void* addr, T compare_value) {
+      if (UseCompressedOops) {
         const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
         return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
       } else {
@@ -661,16 +677,21 @@
 
     template <DecoratorSet decorators, typename T>
     inline static typename EnableIf<
-      HasDecorator<decorators, AS_RAW>::value, T>::type
+      HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
     atomic_xchg(T new_value, void* addr) {
       typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
-      if (can_hardwire_raw<decorators>()) {
-        if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
-          return Raw::oop_atomic_xchg(new_value, addr);
-        } else {
-          return Raw::atomic_xchg(new_value, addr);
-        }
-      } else if (UseCompressedOops) {
+      if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
+        return Raw::oop_atomic_xchg(new_value, addr);
+      } else {
+        return Raw::atomic_xchg(new_value, addr);
+      }
+    }
+
+    template <DecoratorSet decorators, typename T>
+    inline static typename EnableIf<
+      HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
+    atomic_xchg(T new_value, void* addr) {
+      if (UseCompressedOops) {
         const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
         return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
       } else {
@@ -798,6 +819,13 @@
   }
 
   template <DecoratorSet decorators>
+  inline void store_reduce_types(narrowOop* addr, narrowOop value) {
+    const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
+                                             INTERNAL_RT_USE_COMPRESSED_OOPS;
+    PreRuntimeDispatch::store<expanded_decorators>(addr, value);
+  }
+
+  template <DecoratorSet decorators>
   inline void store_reduce_types(HeapWord* addr, oop value) {
     const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
     PreRuntimeDispatch::store<expanded_decorators>(addr, value);
@@ -816,7 +844,16 @@
   }
 
   template <DecoratorSet decorators>
-  inline oop atomic_cmpxchg_reduce_types(oop new_value, HeapWord* addr, oop compare_value) {
+  inline narrowOop atomic_cmpxchg_reduce_types(narrowOop new_value, narrowOop* addr, narrowOop compare_value) {
+    const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
+                                             INTERNAL_RT_USE_COMPRESSED_OOPS;
+    return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
+  }
+
+  template <DecoratorSet decorators>
+  inline oop atomic_cmpxchg_reduce_types(oop new_value,
+                                         HeapWord* addr,
+                                         oop compare_value) {
     const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
     return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
   }
@@ -835,6 +872,13 @@
   }
 
   template <DecoratorSet decorators>
+  inline narrowOop atomic_xchg_reduce_types(narrowOop new_value, narrowOop* addr) {
+    const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
+                                             INTERNAL_RT_USE_COMPRESSED_OOPS;
+    return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
+  }
+
+  template <DecoratorSet decorators>
   inline oop atomic_xchg_reduce_types(oop new_value, HeapWord* addr) {
     const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
     return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
@@ -846,9 +890,10 @@
   }
 
   template <DecoratorSet decorators, typename T>
-  inline oop load_reduce_types(narrowOop* addr) {
-    const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP | INTERNAL_RT_USE_COMPRESSED_OOPS;
-    return PreRuntimeDispatch::load<expanded_decorators, oop>(addr);
+  inline typename OopOrNarrowOop<T>::type load_reduce_types(narrowOop* addr) {
+    const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
+                                             INTERNAL_RT_USE_COMPRESSED_OOPS;
+    return PreRuntimeDispatch::load<expanded_decorators, typename OopOrNarrowOop<T>::type>(addr);
   }
 
   template <DecoratorSet decorators, typename T>
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/accessBackend.hpp
--- a/src/hotspot/share/oops/accessBackend.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/accessBackend.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,6 +28,7 @@
 #include "metaprogramming/conditional.hpp"
 #include "metaprogramming/enableIf.hpp"
 #include "metaprogramming/integralConstant.hpp"
+#include "metaprogramming/isSame.hpp"
 #include "utilities/debug.hpp"
 #include "utilities/globalDefinitions.hpp"
 
@@ -54,11 +55,11 @@
     BARRIER_CLONE
   };
 
-  template <DecoratorSet decorators>
+  template <DecoratorSet decorators, typename T>
   struct MustConvertCompressedOop: public IntegralConstant<bool,
     HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value &&
-    HasDecorator<decorators, INTERNAL_CONVERT_COMPRESSED_OOP>::value &&
-    HasDecorator<decorators, INTERNAL_RT_USE_COMPRESSED_OOPS>::value> {};
+    IsSame<typename HeapOopType<decorators>::type, narrowOop>::value &&
+    IsSame<T, oop>::value> {};
 
   // This metafunction returns an appropriate oop type if the value is oop-like
   // and otherwise returns the same type T.
@@ -172,13 +173,13 @@
   // Only encode if INTERNAL_VALUE_IS_OOP
   template <DecoratorSet idecorators, typename T>
   static inline typename EnableIf<
-    AccessInternal::MustConvertCompressedOop<idecorators>::value,
+    AccessInternal::MustConvertCompressedOop<idecorators, T>::value,
     typename HeapOopType<idecorators>::type>::type
   encode_internal(T value);
 
   template <DecoratorSet idecorators, typename T>
   static inline typename EnableIf<
-    !AccessInternal::MustConvertCompressedOop<idecorators>::value, T>::type
+    !AccessInternal::MustConvertCompressedOop<idecorators, T>::value, T>::type
   encode_internal(T value) {
     return value;
   }
@@ -192,12 +193,12 @@
   // Only decode if INTERNAL_VALUE_IS_OOP
   template <DecoratorSet idecorators, typename T>
   static inline typename EnableIf<
-    AccessInternal::MustConvertCompressedOop<idecorators>::value, T>::type
+    AccessInternal::MustConvertCompressedOop<idecorators, T>::value, T>::type
   decode_internal(typename HeapOopType<idecorators>::type value);
 
   template <DecoratorSet idecorators, typename T>
   static inline typename EnableIf<
-    !AccessInternal::MustConvertCompressedOop<idecorators>::value, T>::type
+    !AccessInternal::MustConvertCompressedOop<idecorators, T>::value, T>::type
   decode_internal(T value) {
     return value;
   }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/accessBackend.inline.hpp
--- a/src/hotspot/share/oops/accessBackend.inline.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/accessBackend.inline.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -32,7 +32,7 @@
 template <DecoratorSet decorators>
 template <DecoratorSet idecorators, typename T>
 inline typename EnableIf<
-  AccessInternal::MustConvertCompressedOop<idecorators>::value, T>::type
+  AccessInternal::MustConvertCompressedOop<idecorators, T>::value, T>::type
 RawAccessBarrier<decorators>::decode_internal(typename HeapOopType<idecorators>::type value) {
   if (HasDecorator<decorators, OOP_NOT_NULL>::value) {
     return oopDesc::decode_heap_oop_not_null(value);
@@ -44,7 +44,7 @@
 template <DecoratorSet decorators>
 template <DecoratorSet idecorators, typename T>
 inline typename EnableIf<
-  AccessInternal::MustConvertCompressedOop<idecorators>::value,
+  AccessInternal::MustConvertCompressedOop<idecorators, T>::value,
   typename HeapOopType<idecorators>::type>::type
 RawAccessBarrier<decorators>::encode_internal(T value) {
   if (HasDecorator<decorators, OOP_NOT_NULL>::value) {
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/instanceKlass.cpp
--- a/src/hotspot/share/oops/instanceKlass.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/instanceKlass.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2265,7 +2265,8 @@
 }
 
 address InstanceKlass::static_field_addr(int offset) {
-  return (address)(offset + InstanceMirrorKlass::offset_of_static_fields() + cast_from_oop<intptr_t>(java_mirror()));
+  assert(offset >= InstanceMirrorKlass::offset_of_static_fields(), "has already been adjusted");
+  return (address)(offset + cast_from_oop<intptr_t>(java_mirror()));
 }
 
 
@@ -3421,6 +3422,15 @@
   }
 }
 
+oop InstanceKlass::klass_holder_phantom() {
+  oop* addr;
+  if (is_anonymous()) {
+    addr = _java_mirror.ptr_raw();
+  } else {
+    addr = &class_loader_data()->_class_loader;
+  }
+  return RootAccess<IN_CONCURRENT_ROOT | ON_PHANTOM_OOP_REF>::oop_load(addr);
+}
 
 #ifdef ASSERT
 void InstanceKlass::set_init_state(ClassState state) {
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/instanceKlass.hpp
--- a/src/hotspot/share/oops/instanceKlass.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/instanceKlass.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -645,6 +645,11 @@
     return is_anonymous() ? java_mirror() : class_loader();
   }
 
+  // Load the klass_holder as a phantom. This is useful when a weak Klass
+  // pointer has been "peeked" and then must be kept alive before it may
+  // be used safely.
+  oop klass_holder_phantom();
+
   bool is_contended() const                {
     return (_misc_flags & _misc_is_contended) != 0;
   }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/oop.hpp
--- a/src/hotspot/share/oops/oop.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/oop.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -28,6 +28,7 @@
 #include "gc/shared/specialized_oop_closures.hpp"
 #include "memory/iterator.hpp"
 #include "memory/memRegion.hpp"
+#include "oops/access.hpp"
 #include "oops/metadata.hpp"
 #include "utilities/macros.hpp"
 
@@ -178,6 +179,8 @@
   static inline void encode_store_heap_oop(oop* p, oop v);
 
   // Access to fields in a instanceOop through these methods.
+  template <DecoratorSet decorator>
+  oop obj_field_access(int offset) const;
   oop obj_field(int offset) const;
   void obj_field_put(int offset, oop value);
   void obj_field_put_raw(int offset, oop value);
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/oops/oop.inline.hpp
--- a/src/hotspot/share/oops/oop.inline.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/oops/oop.inline.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -326,7 +326,10 @@
   *p = encode_heap_oop(v);
 }
 
+template <DecoratorSet decorators>
+inline oop  oopDesc::obj_field_access(int offset) const             { return HeapAccess<decorators>::oop_load_at(as_oop(), offset); }
 inline oop  oopDesc::obj_field(int offset) const                    { return HeapAccess<>::oop_load_at(as_oop(), offset);  }
+
 inline void oopDesc::obj_field_put(int offset, oop value)           { HeapAccess<>::oop_store_at(as_oop(), offset, value); }
 
 inline jbyte oopDesc::byte_field(int offset) const                  { return HeapAccess<>::load_at(as_oop(), offset);  }
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/prims/jvmtiTagMap.cpp
--- a/src/hotspot/share/prims/jvmtiTagMap.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/prims/jvmtiTagMap.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -30,6 +30,7 @@
 #include "code/codeCache.hpp"
 #include "jvmtifiles/jvmtiEnv.hpp"
 #include "memory/resourceArea.hpp"
+#include "oops/access.inline.hpp"
 #include "oops/instanceMirrorKlass.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "oops/objArrayOop.inline.hpp"
@@ -52,10 +53,6 @@
 #include "runtime/vm_operations.hpp"
 #include "services/serviceUtil.hpp"
 #include "utilities/macros.hpp"
-#if INCLUDE_ALL_GCS
-#include "gc/g1/g1SATBCardTableModRefBS.hpp"
-#include "gc/parallel/parallelScavengeHeap.hpp"
-#endif // INCLUDE_ALL_GCS
 
 // JvmtiTagHashmapEntry
 //
@@ -78,22 +75,31 @@
   }
 
   // constructor
-  JvmtiTagHashmapEntry(oop object, jlong tag)         { init(object, tag); }
+  JvmtiTagHashmapEntry(oop object, jlong tag) { init(object, tag); }
 
  public:
 
   // accessor methods
-  inline oop object() const                           { return _object; }
-  inline oop* object_addr()                           { return &_object; }
-  inline jlong tag() const                            { return _tag; }
+  inline oop* object_addr() { return &_object; }
+  inline oop object()       { return RootAccess<ON_PHANTOM_OOP_REF>::oop_load(object_addr()); }
+  // Peek at the object without keeping it alive. The returned object must be
+  // kept alive using a normal access if it leaks out of a thread transition from VM.
+  inline oop object_peek()  {
+    return RootAccess<ON_PHANTOM_OOP_REF | AS_NO_KEEPALIVE>::oop_load(object_addr());
+  }
+  inline jlong tag() const  { return _tag; }
 
   inline void set_tag(jlong tag) {
     assert(tag != 0, "can't be zero");
     _tag = tag;
   }
 
-  inline JvmtiTagHashmapEntry* next() const             { return _next; }
-  inline void set_next(JvmtiTagHashmapEntry* next)      { _next = next; }
+  inline bool equals(oop object) {
+    return object == object_peek();
+  }
+
+  inline JvmtiTagHashmapEntry* next() const        { return _next; }
+  inline void set_next(JvmtiTagHashmapEntry* next) { _next = next; }
 };
 
 
@@ -211,7 +217,7 @@
       JvmtiTagHashmapEntry* entry = _table[i];
       while (entry != NULL) {
         JvmtiTagHashmapEntry* next = entry->next();
-        oop key = entry->object();
+        oop key = entry->object_peek();
         assert(key != NULL, "jni weak reference cleared!!");
         unsigned int h = hash(key, new_size);
         JvmtiTagHashmapEntry* anchor = new_table[h];
@@ -304,7 +310,7 @@
     unsigned int h = hash(key);
     JvmtiTagHashmapEntry* entry = _table[h];
     while (entry != NULL) {
-      if (entry->object() == key) {
+      if (entry->equals(key)) {
          return entry;
       }
       entry = entry->next();
@@ -345,7 +351,7 @@
     JvmtiTagHashmapEntry* entry = _table[h];
     JvmtiTagHashmapEntry* prev = NULL;
     while (entry != NULL) {
-      if (key == entry->object()) {
+      if (entry->equals(key)) {
         break;
       }
       prev = entry;
@@ -1535,16 +1541,12 @@
   void do_entry(JvmtiTagHashmapEntry* entry) {
     for (int i=0; i<_tag_count; i++) {
       if (_tags[i] == entry->tag()) {
+        // The reference in this tag map could be the only (implicitly weak)
+        // reference to that object. If we hand it out, we need to keep it live wrt
+        // SATB marking similar to other j.l.ref.Reference referents. This is
+        // achieved by using a phantom load in the object() accessor.
         oop o = entry->object();
         assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check");
-#if INCLUDE_ALL_GCS
-        if (UseG1GC) {
-          // The reference in this tag map could be the only (implicitly weak)
-          // reference to that object. If we hand it out, we need to keep it live wrt
-          // SATB marking similar to other j.l.ref.Reference referents.
-          G1SATBCardTableModRefBS::enqueue(o);
-        }
-#endif
         jobject ref = JNIHandles::make_local(JavaThread::current(), o);
         _object_results->append(ref);
         _tag_results->append((uint64_t)entry->tag());
@@ -3363,10 +3365,8 @@
     while (entry != NULL) {
       JvmtiTagHashmapEntry* next = entry->next();
 
-      oop* obj = entry->object_addr();
-
       // has object been GC'ed
-      if (!is_alive->do_object_b(entry->object())) {
+      if (!is_alive->do_object_b(entry->object_peek())) {
         // grab the tag
         jlong tag = entry->tag();
         guarantee(tag != 0, "checking");
@@ -3384,7 +3384,7 @@
         ++freed;
       } else {
         f->do_oop(entry->object_addr());
-        oop new_oop = entry->object();
+        oop new_oop = entry->object_peek();
 
         // if the object has moved then re-hash it and move its
         // entry to its new location.
@@ -3418,7 +3418,7 @@
   // Re-add all the entries which were kept aside
   while (delayed_add != NULL) {
     JvmtiTagHashmapEntry* next = delayed_add->next();
-    unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object(), size);
+    unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object_peek(), size);
     delayed_add->set_next(table[pos]);
     table[pos] = delayed_add;
     delayed_add = next;
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/prims/resolvedMethodTable.cpp
--- a/src/hotspot/share/prims/resolvedMethodTable.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "gc/shared/gcLocker.hpp"
 #include "memory/allocation.hpp"
+#include "oops/access.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/method.hpp"
 #include "oops/symbol.hpp"
@@ -33,10 +34,20 @@
 #include "runtime/mutexLocker.hpp"
 #include "utilities/hashtable.inline.hpp"
 #include "utilities/macros.hpp"
-#if INCLUDE_ALL_GCS
-#include "gc/g1/g1SATBCardTableModRefBS.hpp"
-#endif
+
+
+oop ResolvedMethodEntry::object() {
+  return RootAccess<ON_PHANTOM_OOP_REF>::oop_load(literal_addr());
+}
 
+oop ResolvedMethodEntry::object_no_keepalive() {
+  // The AS_NO_KEEPALIVE peeks at the oop without keeping it alive.
+  // This is dangerous in general but is okay if the loaded oop does
+  // not leak out past a thread transition where a safepoint can happen.
+  // A subsequent oop_load without AS_NO_KEEPALIVE (the object() accessor)
+  // keeps the oop alive before doing so.
+  return RootAccess<ON_PHANTOM_OOP_REF | AS_NO_KEEPALIVE>::oop_load(literal_addr());
+}
 
 ResolvedMethodTable::ResolvedMethodTable()
   : Hashtable<oop, mtClass>(_table_size, sizeof(ResolvedMethodEntry)) { }
@@ -44,13 +55,18 @@
 oop ResolvedMethodTable::lookup(int index, unsigned int hash, Method* method) {
   for (ResolvedMethodEntry* p = bucket(index); p != NULL; p = p->next()) {
     if (p->hash() == hash) {
-      oop target = p->literal();
+
+      // Peek the object to check if it is the right target.
+      oop target = p->object_no_keepalive();
+
       // The method is in the table as a target already
       if (java_lang_invoke_ResolvedMethodName::vmtarget(target) == method) {
         ResourceMark rm;
         log_debug(membername, table) ("ResolvedMethod entry found for %s index %d",
                                        method->name_and_sig_as_C_string(), index);
-        return target;
+        // The object() accessor makes sure the target object is kept alive before
+        // leaking out.
+        return p->object();
       }
     }
   }
@@ -70,18 +86,6 @@
   return lookup(index, hash, method);
 }
 
-// Tell the GC that this oop was looked up in the table
-static void ensure_oop_alive(oop mname) {
-  // A lookup in the ResolvedMethodTable could return an object that was previously
-  // considered dead. The SATB part of G1 needs to get notified about this
-  // potential resurrection, otherwise the marking might not find the object.
-#if INCLUDE_ALL_GCS
-  if (UseG1GC && mname != NULL) {
-    G1SATBCardTableModRefBS::enqueue(mname);
-  }
-#endif
-}
-
 oop ResolvedMethodTable::basic_add(Method* method, oop rmethod_name) {
   assert_locked_or_safepoint(ResolvedMethodTable_lock);
 
@@ -91,7 +95,6 @@
   // One was added while aquiring the lock
   oop entry = lookup(index, hash, method);
   if (entry != NULL) {
-    ensure_oop_alive(entry);
     return entry;
   }
 
@@ -100,14 +103,13 @@
   ResourceMark rm;
   log_debug(membername, table) ("ResolvedMethod entry added for %s index %d",
                                  method->name_and_sig_as_C_string(), index);
-  return p->literal();
+  return rmethod_name;
 }
 
 ResolvedMethodTable* ResolvedMethodTable::_the_table = NULL;
 
 oop ResolvedMethodTable::find_method(Method* method) {
   oop entry = _the_table->lookup(method);
-  ensure_oop_alive(entry);
   return entry;
 }
 
@@ -147,12 +149,12 @@
     ResolvedMethodEntry* entry = _the_table->bucket(i);
     while (entry != NULL) {
       _oops_counted++;
-      if (is_alive->do_object_b(entry->literal())) {
+      if (is_alive->do_object_b(entry->object_no_keepalive())) {
         p = entry->next_addr();
       } else {
         _oops_removed++;
         if (log_is_enabled(Debug, membername, table)) {
-          Method* m = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(entry->literal());
+          Method* m = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(entry->object_no_keepalive());
           ResourceMark rm;
           log_debug(membername, table) ("ResolvedMethod entry removed for %s index %d",
                                            m->name_and_sig_as_C_string(), i);
@@ -185,7 +187,7 @@
     ResolvedMethodEntry* entry = bucket(i);
     while (entry != NULL) {
       tty->print("%d : ", i);
-      oop rmethod_name = entry->literal();
+      oop rmethod_name = entry->object_no_keepalive();
       rmethod_name->print();
       Method* m = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(rmethod_name);
       m->print();
@@ -203,8 +205,7 @@
   for (int i = 0; i < _the_table->table_size(); ++i) {
     ResolvedMethodEntry* entry = _the_table->bucket(i);
     while (entry != NULL) {
-
-      oop mem_name = entry->literal();
+      oop mem_name = entry->object_no_keepalive();
       Method* old_method = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(mem_name);
 
       if (old_method->is_old()) {
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/prims/resolvedMethodTable.hpp
--- a/src/hotspot/share/prims/resolvedMethodTable.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/prims/resolvedMethodTable.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -44,6 +44,9 @@
     return (ResolvedMethodEntry**)HashtableEntry<oop, mtClass>::next_addr();
   }
 
+  oop object();
+  oop object_no_keepalive();
+
   void print_on(outputStream* st) const;
 };
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/runtime/arguments.cpp
--- a/src/hotspot/share/runtime/arguments.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/runtime/arguments.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -527,6 +527,7 @@
   { "ConvertSleepToYield",           JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
   { "ConvertYieldToSleep",           JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
   { "MinSleepInterval",              JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
+  { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "PermSize",                      JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
   { "MaxPermSize",                   JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
   { "SharedReadWriteSize",           JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/runtime/globals.hpp
--- a/src/hotspot/share/runtime/globals.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/runtime/globals.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -893,9 +893,6 @@
   develop(bool, TraceJavaAssertions, false,                                 \
           "Trace java language assertions")                                 \
                                                                             \
-  notproduct(bool, CheckAssertionStatusDirectives, false,                   \
-          "Temporary - see javaClasses.cpp")                                \
-                                                                            \
   notproduct(bool, PrintMallocFree, false,                                  \
           "Trace calls to C heap malloc/free allocation")                   \
                                                                             \
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/runtime/init.cpp
--- a/src/hotspot/share/runtime/init.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/runtime/init.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -131,6 +131,7 @@
   InterfaceSupport_init();
   SharedRuntime::generate_stubs();
   universe2_init();  // dependent on codeCache_init and stubRoutines_init1
+  javaClasses_init();// must happen after vtable initialization, before referenceProcessor_init
   referenceProcessor_init();
   jni_handles_init();
 #if INCLUDE_VM_STRUCTS
@@ -150,7 +151,6 @@
   if (!universe_post_init()) {
     return JNI_ERR;
   }
-  javaClasses_init();   // must happen after vtable initialization
   stubRoutines_init2(); // note: StubRoutines need 2-phase init
   MethodHandles::generate_adapters();
 
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/runtime/os.hpp
--- a/src/hotspot/share/runtime/os.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/runtime/os.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -778,7 +778,6 @@
   static void* signal(int signal_number, void* handler);
   static void  signal_raise(int signal_number);
   static int   signal_wait();
-  static int   signal_lookup();
   static void* user_handler();
   static void  terminate_signal_thread();
   static int   sigexitnum_pd();
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/runtime/vm_operations.hpp
--- a/src/hotspot/share/runtime/vm_operations.hpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/runtime/vm_operations.hpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -67,9 +67,8 @@
   template(CGC_Operation)                         \
   template(CMS_Initial_Mark)                      \
   template(CMS_Final_Remark)                      \
+  template(G1CollectForAllocation)                \
   template(G1CollectFull)                         \
-  template(G1CollectForAllocation)                \
-  template(G1IncCollectionPause)                  \
   template(HandshakeOneThread)                    \
   template(HandshakeAllThreads)                   \
   template(HandshakeFallback)                     \
diff -r a587f95313f1 -r 7bba05746c44 src/hotspot/share/utilities/vmError.cpp
--- a/src/hotspot/share/utilities/vmError.cpp	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/hotspot/share/utilities/vmError.cpp	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -243,11 +243,12 @@
           RegisterMap map((JavaThread*)t, false); // No update
           fr = fr.sender(&map);
         } else {
+          // is_first_C_frame() does only simple checks for frame pointer,
+          // it will pass if java compiled code has a pointer in EBP.
+          if (os::is_first_C_frame(&fr)) break;
           fr = os::get_sender_for_C_frame(&fr);
         }
       } else {
-        // is_first_C_frame() does only simple checks for frame pointer,
-        // it will pass if java compiled code has a pointer in EBP.
         if (os::is_first_C_frame(&fr)) break;
         fr = os::get_sender_for_C_frame(&fr);
       }
diff -r a587f95313f1 -r 7bba05746c44 src/jdk.attach/share/classes/sun/tools/attach/HotSpotVirtualMachine.java
--- a/src/jdk.attach/share/classes/sun/tools/attach/HotSpotVirtualMachine.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/jdk.attach/share/classes/sun/tools/attach/HotSpotVirtualMachine.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -86,6 +86,10 @@
     private void loadAgentLibrary(String agentLibrary, boolean isAbsolute, String options)
         throws AgentLoadException, AgentInitializationException, IOException
     {
+        if (agentLibrary == null) {
+            throw new NullPointerException("agentLibrary cannot be null");
+        }
+
         String msgPrefix = "return code: ";
         InputStream in = execute("load",
                                  agentLibrary,
@@ -131,6 +135,10 @@
     public void loadAgent(String agent, String options)
         throws AgentLoadException, AgentInitializationException, IOException
     {
+        if (agent == null) {
+            throw new NullPointerException("agent cannot be null");
+        }
+
         String args = agent;
         if (options != null) {
             args = args + "=" + options;
diff -r a587f95313f1 -r 7bba05746c44 src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/CommandProcessor.java
--- a/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/CommandProcessor.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/CommandProcessor.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1607,7 +1607,9 @@
                             if (!all) return;
                         }
                     }
-                    out.println("Couldn't find thread " + name);
+                    if (!all) {
+                        out.println("Couldn't find thread " + name);
+                    }
                 }
             }
         },
diff -r a587f95313f1 -r 7bba05746c44 src/utils/LogCompilation/src/main/java/com/sun/hotspot/tools/compiler/CallSite.java
--- a/src/utils/LogCompilation/src/main/java/com/sun/hotspot/tools/compiler/CallSite.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/utils/LogCompilation/src/main/java/com/sun/hotspot/tools/compiler/CallSite.java	Sat Jan 13 02:56:22 2018 +0100
@@ -105,6 +105,11 @@
     private List<UncommonTrap> traps;
 
     /**
+     * The name of the intrinsic at this call site.
+     */
+    private String intrinsicName;
+
+    /**
      * Default constructor: used to create an instance that represents the top
      * scope of a compilation.
      */
@@ -179,6 +184,7 @@
         } else {
             stream.print("  @ " + getBci() + " " + m + " " + getReason());
         }
+        stream.print(getIntrinsicOrEmptyString());
         stream.printf(" (end time: %6.4f", getTimeStamp());
         if (getEndNodes() > 0) {
             stream.printf(" nodes: %d live: %d", getEndNodes(), getEndLiveNodes());
@@ -368,4 +374,19 @@
     public void setInlineId(long inlineId) {
         this.inlineId = inlineId;
     }
+
+    public String getIntrinsicName() {
+        return intrinsicName;
+    }
+
+    public void setIntrinsicName(String name) {
+        this.intrinsicName = name;
+    }
+
+    public String getIntrinsicOrEmptyString() {
+        if (intrinsicName != null) {
+            return " (intrinsic: " + getIntrinsicName() + ")";
+        }
+        return "";
+    }
 }
diff -r a587f95313f1 -r 7bba05746c44 src/utils/LogCompilation/src/main/java/com/sun/hotspot/tools/compiler/LogParser.java
--- a/src/utils/LogCompilation/src/main/java/com/sun/hotspot/tools/compiler/LogParser.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/src/utils/LogCompilation/src/main/java/com/sun/hotspot/tools/compiler/LogParser.java	Sat Jan 13 02:56:22 2018 +0100
@@ -975,6 +975,12 @@
                 // track of it but don't add it to the list yet.
                 methodHandleSite = site;
             }
+        } else if (qname.equals("intrinsic")) {
+            String id = atts.getValue("id");
+            assert id != null : "intrinsic id is null";
+            CallSite cs = (site != null) ? site : scopes.peek();
+            assert cs != null : "no CallSite?";
+            cs.setIntrinsicName(id);
         } else if (qname.equals("regalloc")) {
             compile.setAttempts(Integer.parseInt(search(atts, "attempts")));
         } else if (qname.equals("inline_fail")) {
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/Makefile
--- a/test/hotspot/jtreg/Makefile	Fri Jan 19 17:11:52 2018 +0100
+++ b/test/hotspot/jtreg/Makefile	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 1995, 2016, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 1995, 2018, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -66,13 +66,15 @@
   CONCURRENCY_FACTOR = 1
 endif
 
-# Concurrency based on min(cores / 2, 12)
-CONCURRENCY := $(shell awk 'BEGIN { printf "%.0f", $(NUM_CORES) / 2 * $(CONCURRENCY_FACTOR) }')
-ifeq ($(CONCURRENCY), 0)
-  CONCURRENCY := 1
-else ifeq ($(shell expr $(CONCURRENCY) \> 12), 1)
-  CONCURRENCY := 12
-endif
+# Concurrency based on min(cores / 2, 12) * CONCURRENCY_FACTOR
+CONCURRENCY := $(shell awk \
+  'BEGIN { \
+    c = $(NUM_CORES) / 2; \
+    if (c > 12) c = 12; \
+    c = c * $(CONCURRENCY_FACTOR); \
+    if (c < 1) c = 1; \
+    printf "%.0f", c; \
+  }')
 
 # Make sure MaxRAMPercentage is high enough to not cause OOM or swapping since we may end up with a lot of JVM's
 JTREG_BASIC_OPTIONS += -vmoption:-XX:MaxRAMPercentage=$(shell expr 25 / $(CONCURRENCY))
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/ProblemList.txt
--- a/test/hotspot/jtreg/ProblemList.txt	Fri Jan 19 17:11:52 2018 +0100
+++ b/test/hotspot/jtreg/ProblemList.txt	Sat Jan 13 02:56:22 2018 +0100
@@ -71,6 +71,7 @@
 gc/stress/gclocker/TestGCLockerWithParallel.java 8180622 generic-all
 gc/stress/gclocker/TestGCLockerWithG1.java 8179226 generic-all
 gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterMinorGC.java 8177765 generic-all
+gc/stress/TestJNIBlockFullGC/TestJNIBlockFullGC.java 8192647 generic-all
 
 #############################################################################
 
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/gc/stress/TestJNIBlockFullGC/TestJNIBlockFullGC.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/stress/TestJNIBlockFullGC/TestJNIBlockFullGC.java	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, SAP SE and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test TestJNIBlockFullGC
+ * @summary Check that in G1 a Full GC to reclaim space can not be blocked out by the GC locker.
+ * @key gc
+ * @requires vm.gc.G1
+ * @run main/othervm/native -Xmx64m -XX:+UseG1GC -Xlog:gc=info,gc+alloc=trace -XX:MaxGCPauseMillis=10 TestJNIBlockFullGC 10 10000 10000 10000 30000 10000 0.7
+ */
+
+import java.lang.ref.SoftReference;
+
+public class TestJNIBlockFullGC {
+
+    static {
+        System.loadLibrary("TestJNIBlockFullGC");
+    }
+
+    public static volatile Object tmp;
+
+    public static volatile boolean hadError = false;
+
+    private static native int TestCriticalArray0(int[] x);
+
+    public static class Node {
+        public SoftReference<Node> next;
+        long payload1;
+        long payload2;
+        long payload3;
+        long payload4;
+
+        public Node(int load) {
+            payload1 = payload2 = payload3 = payload4 = load;
+        }
+    }
+
+    public static void warmUp(long warmupEndTime, int size) {
+        // First let the GC assume most of our objects will die.
+        Node[] roots = new Node[size];
+
+        while (System.currentTimeMillis() < warmupEndTime) {
+            int index = (int) (Math.random() * roots.length);
+            roots[index] = new Node(1);
+        }
+
+        // Make sure the young generation is empty.
+        for (int i = 0; i < roots.length; ++i) {
+            roots[i] = null;
+        }
+    }
+
+    public static void runTest(long endTime, int size, double alive) {
+        final int length = 10000;
+        int[] array1 = new int[length];
+        for (int x = 1; x < length; x++) {
+            array1[x] = x;
+        }
+
+        Node[] roots = new Node[size];
+        try {
+            int index = 0;
+            roots[0] = new Node(0);
+
+            while (!hadError && (System.currentTimeMillis() < endTime)) {
+                int test_val1 = TestCriticalArray0(array1);
+
+                if (Math.random() > alive) {
+                    tmp = new Node(test_val1);
+                } else {
+                    index = (int) (Math.random() * roots.length);
+
+                    if (roots[index] != null) {
+                        Node node = new Node(test_val1);
+                        node.next = new SoftReference<Node>(roots[index]);
+                        roots[index] = node;
+                    } else {
+                        roots[index] = new Node(test_val1);
+                    }
+                }
+            }
+        } catch (OutOfMemoryError e) {
+            hadError = true;
+            e.printStackTrace();
+        }
+    }
+
+    private static void joinThreads(Thread[] threads) throws Exception {
+        for (int i = 0; i < threads.length; i++) {
+            try {
+                if (threads[i] != null) {
+                  threads[i].join();
+                }
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+                throw e;
+            }
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        if (args.length < 7){
+            System.out.println("Usage: java TestJNIBlockFullGC <warmupThreads> <warmup-time-in-millis> <warmup iterations> <threads> <time-in-millis> <iterations> <aliveFrac>");
+            System.exit(0);
+        }
+
+        int warmupThreads = Integer.parseInt(args[0]);
+        System.out.println("# Warmup Threads = " + warmupThreads);
+
+        int warmupDuration = Integer.parseInt(args[1]);
+        System.out.println("WarmUp Duration = " + warmupDuration);
+        int warmupIterations = Integer.parseInt(args[2]);
+        System.out.println("# Warmup Iterations = "+ warmupIterations);
+
+        int mainThreads = Integer.parseInt(args[3]);
+        System.out.println("# Main Threads = " + mainThreads);
+        int mainDuration = Integer.parseInt(args[4]);
+        System.out.println("Main Duration = " + mainDuration);
+        int mainIterations = Integer.parseInt(args[5]);
+        System.out.println("# Main Iterations = " + mainIterations);
+
+        double liveFrac = Double.parseDouble(args[6]);
+        System.out.println("Live Fraction = " + liveFrac);
+
+        Thread threads[] = new Thread[Math.max(warmupThreads, mainThreads)];
+
+        System.out.println("Start warm-up threads!");
+        long warmupStartTime = System.currentTimeMillis();
+        for (int i = 0; i < warmupThreads; i++) {
+            threads[i] = new Thread() {
+                public void run() {
+                    warmUp(warmupStartTime + warmupDuration, warmupIterations);
+                };
+            };
+            threads[i].start();
+        }
+
+        joinThreads(threads);
+
+        System.gc();
+        System.out.println("Keep alive a lot");
+
+        long startTime = System.currentTimeMillis();
+        for (int i = 0; i < mainThreads; i++) {
+            threads[i] = new Thread() {
+                public void run() {
+                    runTest(startTime + mainDuration, mainIterations, liveFrac);
+                };
+            };
+            threads[i].start();
+        }
+        System.out.println("All threads started");
+
+        joinThreads(threads);
+
+        if (hadError) {
+            throw new RuntimeException("Experienced an OoME during execution.");
+        }
+    }
+}
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/gc/stress/TestJNIBlockFullGC/libTestJNIBlockFullGC.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/stress/TestJNIBlockFullGC/libTestJNIBlockFullGC.c	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, SAP SE and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "jni.h"
+
+JNIEXPORT jint JNICALL
+Java_TestJNIBlockFullGC_TestCriticalArray0(JNIEnv *env, jclass jCls, jintArray jIn) {
+  jint *bufIn = NULL;
+  jint jInLen = (*env)->GetArrayLength(env, jIn);
+  jint result = 0;
+  jint i;
+
+  if (jInLen != 0) {
+    bufIn = (jint*)(*env)->GetPrimitiveArrayCritical(env, jIn, 0);
+  }
+
+  for (i = 0; i < jInLen; ++i) {
+    result += bufIn[i]; // result = sum of all array elements
+  }
+
+  if (bufIn != NULL) {
+    (*env)->ReleasePrimitiveArrayCritical(env, jIn, bufIn, 0);
+  }
+
+  return result;
+}
+
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/gc/stress/TestReclaimStringsLeaksMemory.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/stress/TestReclaimStringsLeaksMemory.java	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test TestReclaimStringsLeaksMemory
+ * @bug 8180048
+ * @summary Ensure that during a Full GC interned string memory is reclaimed completely.
+ * @requires vm.gc=="null"
+ * @requires !vm.debug
+ * @key gc
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @run main/othervm TestReclaimStringsLeaksMemory
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseSerialGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseParallelGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseParallelGC -XX:-UseParallelOldGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseConcMarkSweepGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseG1GC
+ */
+
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+import jdk.test.lib.Asserts;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+
+public class TestReclaimStringsLeaksMemory {
+
+    // The amount of memory in kB reserved in the "Symbol" category that indicates a memory leak for
+    // this test.
+    public static final int ReservedThreshold = 70000;
+
+    public static void main(String[] args) throws Exception {
+        ArrayList<String> baseargs = new ArrayList(Arrays.asList( "-Xms256M",
+                                                                  "-Xmx256M",
+                                                                  "-Xlog:gc*",
+                                                                  "-XX:NativeMemoryTracking=summary",
+                                                                  "-XX:+UnlockDiagnosticVMOptions",
+                                                                  "-XX:+PrintNMTStatistics" ));
+        baseargs.addAll(Arrays.asList(args));
+        baseargs.add(GCTest.class.getName());
+        ProcessBuilder pb_default =
+            ProcessTools.createJavaProcessBuilder(baseargs.toArray(new String[] {}));
+        verifySymbolMemoryUsageNotTooHigh(new OutputAnalyzer(pb_default.start()));
+    }
+
+    private static void verifySymbolMemoryUsageNotTooHigh(OutputAnalyzer output) throws Exception {
+        String stdout = output.getStdout();
+        System.out.println(stdout);
+
+        Pattern p = Pattern.compile("Symbol \\(reserved=(\\d*)");
+        Matcher m = p.matcher(stdout);
+
+        if (!m.find()) {
+            throw new RuntimeException("Could not find Symbol memory usage in NMT output");
+        }
+
+        int reserved = Integer.parseInt(m.group(1));
+        Asserts.assertLT(reserved, ReservedThreshold, "Reserved memory size is " + reserved + "KB which is greater than or equal to " + ReservedThreshold + "KB indicating a memory leak");
+
+        output.shouldHaveExitValue(0);
+    }
+
+    static class GCTest {
+        public static final String BaseName = "SomeRandomBaseString";
+        public static volatile String lastString;
+
+        public static void main(String [] args) {
+            for (int iterations = 0; iterations < 20;) {
+                for (int i = 0; i < 1000000; i++) {
+                    lastString = (BaseName + i).intern();
+                }
+                if (++iterations % 5 == 0) {
+                   System.gc();
+                }
+            }
+        }
+    }
+}
+
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/runtime/ErrorHandling/BadNativeStackInErrorHandlingTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/ErrorHandling/BadNativeStackInErrorHandlingTest.java	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.util.regex.Pattern;
+
+import jdk.test.lib.Platform;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+
+/*
+ * @test
+ * @bug 8194652
+ * @summary Printing native stack shows an "error occurred during error reporting".
+ * @modules java.base/jdk.internal.misc
+ * @library /test/lib
+ */
+
+// This test was adapted from SafeFetchInErrorHandlingTest.java.
+public class BadNativeStackInErrorHandlingTest {
+  public static void main(String[] args) throws Exception {
+    if (!Platform.isDebugBuild() || Platform.isZero()) {
+      return;
+    }
+
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+        "-XX:+UnlockDiagnosticVMOptions",
+        "-Xmx100M",
+        "-XX:ErrorHandlerTest=14",
+        "-XX:-CreateCoredumpOnCrash",
+        "-version");
+
+    OutputAnalyzer output_detail = new OutputAnalyzer(pb.start());
+
+    // we should have crashed with a SIGSEGV
+    output_detail.shouldMatch("# A fatal error has been detected by the Java Runtime Environment:.*");
+    output_detail.shouldMatch("# +(?:SIGSEGV|EXCEPTION_ACCESS_VIOLATION).*");
+
+    // extract hs-err file
+    String hs_err_file = output_detail.firstMatch("# *(\\S*hs_err_pid\\d+\\.log)", 1);
+    if (hs_err_file == null) {
+        throw new RuntimeException("Did not find hs-err file in output.\n");
+    }
+
+    File f = new File(hs_err_file);
+    if (!f.exists()) {
+        throw new RuntimeException("hs-err file missing at " +
+                                   f.getAbsolutePath() + ".\n");
+    }
+
+    System.out.println("Found hs_err file. Scanning...");
+
+    FileInputStream fis = new FileInputStream(f);
+    BufferedReader br = new BufferedReader(new InputStreamReader(fis));
+    String line = null;
+
+    // The failing line looks like this:
+    // [error occurred during error reporting (printing native stack), id 0xb]
+    Pattern pattern =
+        Pattern.compile("\\[error occurred during error reporting \\(printing native stack\\), id .*\\]");
+
+    String lastLine = null;
+    while ((line = br.readLine()) != null) {
+        if (pattern.matcher(line).matches()) {
+            System.out.println("Found: " + line + ".");
+            throw new RuntimeException("hs-err file should not contain: '" +
+                                       pattern + "'");
+        }
+        lastLine = line;
+    }
+    br.close();
+
+    if (!lastLine.equals("END.")) {
+        throw new RuntimeException("hs-err file incomplete (missing END marker.)");
+    } else {
+        System.out.println("End marker found.");
+    }
+
+    System.out.println("OK.");
+  }
+}
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/runtime/NMT/PrintNMTStatistics.java
--- a/test/hotspot/jtreg/runtime/NMT/PrintNMTStatistics.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/test/hotspot/jtreg/runtime/NMT/PrintNMTStatistics.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -46,7 +46,6 @@
     OutputAnalyzer output_detail = new OutputAnalyzer(pb.start());
     output_detail.shouldContain("Virtual memory map:");
     output_detail.shouldContain("Details:");
-    output_detail.shouldNotContain("error");
     output_detail.shouldHaveExitValue(0);
 
     // Make sure memory reserved for Module processing is recorded.
@@ -62,7 +61,6 @@
     output_summary.shouldContain("Java Heap (reserved=");
     output_summary.shouldNotContain("Virtual memory map:");
     output_summary.shouldNotContain("Details:");
-    output_summary.shouldNotContain("error");
     output_summary.shouldHaveExitValue(0);
     }
 }
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/runtime/appcds/DirClasspathTest.java
--- a/test/hotspot/jtreg/runtime/appcds/DirClasspathTest.java	Fri Jan 19 17:11:52 2018 +0100
+++ b/test/hotspot/jtreg/runtime/appcds/DirClasspathTest.java	Sat Jan 13 02:56:22 2018 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,8 +33,13 @@
 import jdk.test.lib.Platform;
 import jdk.test.lib.process.OutputAnalyzer;
 import java.io.File;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
 
 public class DirClasspathTest {
+    private static final int MAX_PATH = 260;
+
     public static void main(String[] args) throws Exception {
         File dir = new File(System.getProperty("user.dir"));
         File emptydir = new File(dir, "emptydir");
@@ -42,15 +47,36 @@
 
         // Empty dir in -cp: should be OK
         OutputAnalyzer output;
-        if (!Platform.isWindows()) {
-            // This block fails on Windows because of JDK-8192927
-            output = TestCommon.dump(emptydir.getPath(), TestCommon.list("DoesntMatter"), "-Xlog:class+path=info");
-            TestCommon.checkDump(output);
+        String classList[] = {"java/lang/Object"};
+        output = TestCommon.dump(emptydir.getPath(), classList, "-Xlog:class+path=info");
+        TestCommon.checkDump(output);
+
+        // Long path to empty dir in -cp: should be OK
+        Path classDir = Paths.get(System.getProperty("test.classes"));
+        Path destDir = classDir;
+        int subDirLen = MAX_PATH - classDir.toString().length() - 2;
+        if (subDirLen > 0) {
+            char[] chars = new char[subDirLen];
+            Arrays.fill(chars, 'x');
+            String subPath = new String(chars);
+            destDir = Paths.get(System.getProperty("test.classes"), subPath);
         }
+        File longDir = destDir.toFile();
+        longDir.mkdir();
+        File subDir = new File(longDir, "subdir");
+        subDir.mkdir();
+        output = TestCommon.dump(subDir.getPath(), classList, "-Xlog:class+path=info");
+        TestCommon.checkDump(output);
 
         // Non-empty dir in -cp: should fail
         // <dir> is not empty because it has at least one subdirectory, i.e., <emptydir>
-        output = TestCommon.dump(dir.getPath(), TestCommon.list("DoesntMatter"), "-Xlog:class+path=info");
+        output = TestCommon.dump(dir.getPath(), classList, "-Xlog:class+path=info");
+        output.shouldNotHaveExitValue(0);
+        output.shouldContain("CDS allows only empty directories in archived classpaths");
+
+        // Long path to non-empty dir in -cp: should fail
+        // <dir> is not empty because it has at least one subdirectory, i.e., <emptydir>
+        output = TestCommon.dump(longDir.getPath(), classList, "-Xlog:class+path=info");
         output.shouldNotHaveExitValue(0);
         output.shouldContain("CDS allows only empty directories in archived classpaths");
     }
diff -r a587f95313f1 -r 7bba05746c44 test/hotspot/jtreg/serviceability/sa/ClhsdbThread.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/serviceability/sa/ClhsdbThread.java	Sat Jan 13 02:56:22 2018 +0100
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import jdk.test.lib.apps.LingeredApp;
+
+/*
+ * @test
+ * @bug 8193352
+ * @summary Test clhsdb 'thread' and 'threads' commands
+ * @library /test/lib
+ * @run main/othervm ClhsdbThread
+ */
+
+public class ClhsdbThread {
+
+    public static void main(String[] args) throws Exception {
+        System.out.println("Starting ClhsdbThread test");
+
+        LingeredApp theApp = null;
+        try {
+            ClhsdbLauncher test = new ClhsdbLauncher();
+            theApp = LingeredApp.startApp();
+            System.out.println("Started LingeredApp with pid " + theApp.getPid());
+
+            List<String> cmds = List.of("thread", "thread -a", "threads");
+
+            Map<String, List<String>> expStrMap = new HashMap<>();
+            // Check for the presence of the usage string
+            expStrMap.put("thread", List.of( "Usage: thread { -a | id }"));
+            expStrMap.put("thread -a", List.of(
+                "State: BLOCKED",
+                "Stack in use by Java",
+                "Base of Stack",
+                "Last_Java_SP:",
+                "Address"));
+            expStrMap.put("threads", List.of(
+                "Finalizer",
+                "Signal Dispatcher",
+                "Common-Cleaner",
+                "Stack in use by Java:",
+                "State:",
+                "Base of Stack:",
+                "main"));
+            Map<String, List<String>> unExpStrMap = new HashMap<>();
+            unExpStrMap.put(
+                "thread -a",
+                List.of("Couldn't find thread -a"));
+
+            String consolidatedOutput = test.run(
+                theApp.getPid(),
+                cmds,
+                expStrMap,
+                unExpStrMap);
+
+            if (consolidatedOutput == null) {
+                // Output could be null due to attach permission issues.
+                System.out.println(
+                    "Output is empty. Probably due to attach permission issues.");
+                LingeredApp.stopApp(theApp);
+                return;
+            }
+
+            // Test the thread <id> command now. Obtain <id> from the
+            // output of the previous 'threads' command. The word before
+            // the token 'Finalizer' should denote the thread id of the
+            // 'Finalizer' thread.
+
+            String[] snippets = consolidatedOutput.split("Finalizer");
+            String[] wordTokens = snippets[0].split(" ");
+            String threadIdObtained = wordTokens[wordTokens.length - 1];
+
+            // Weed out newlines and blurb before that.
+            if (threadIdObtained.contains("\n")) {
+                String[] threadIdTokens = threadIdObtained.split("\n");
+                threadIdObtained = threadIdTokens[threadIdTokens.length - 1];
+            }
+
+            expStrMap = new HashMap<>();
+            System.out.println("Thread Id obtained is: " + threadIdObtained);
+
+            String cmd = "thread " + threadIdObtained;
+            expStrMap.put(cmd, List.of(
+                "Base of Stack:",
+                "State:",
+                "Last_Java_SP"));
+            cmds = List.of(cmd);
+            test.run(theApp.getPid(), cmds, expStrMap, null);
+        } catch (Exception ex) {
+            throw new RuntimeException("Test ERROR " + ex, ex);
+        } finally {
+            LingeredApp.stopApp(theApp);
+        }
+        System.out.println("Test PASSED");
+    }
+}