# HG changeset patch
# User thartmann
# Date 1414670610 -3600
# Node ID b4b185d05bb5c2ac2dec7218f2592bbbe92af093
# Parent  b276c91c126489887bbcdcbdf2b8af4677a49d9f
8061817: Whitebox.deoptimizeMethod() does not deoptimize all OSR versions of method
Summary: Fixed Whitebox.deoptimizeMethod() to deoptimize all OSR versions of the method.
Reviewed-by: kvn, iignatyev

diff -r b276c91c1264 -r b4b185d05bb5 hotspot/src/share/vm/oops/instanceKlass.cpp
--- a/hotspot/src/share/vm/oops/instanceKlass.cpp	Wed Oct 29 15:42:48 2014 +0100
+++ b/hotspot/src/share/vm/oops/instanceKlass.cpp	Thu Oct 30 13:03:30 2014 +0100
@@ -2845,6 +2845,22 @@
   }
 }
 
+int InstanceKlass::mark_osr_nmethods(const Method* m) {
+  // This is a short non-blocking critical region, so the no safepoint check is ok.
+  MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
+  nmethod* osr = osr_nmethods_head();
+  int found = 0;
+  while (osr != NULL) {
+    assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
+    if (osr->method() == m) {
+      osr->mark_for_deoptimization();
+      found++;
+    }
+    osr = osr->osr_link();
+  }
+  return found;
+}
+
 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
   // This is a short non-blocking critical region, so the no safepoint check is ok.
   MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
diff -r b276c91c1264 -r b4b185d05bb5 hotspot/src/share/vm/oops/instanceKlass.hpp
--- a/hotspot/src/share/vm/oops/instanceKlass.hpp	Wed Oct 29 15:42:48 2014 +0100
+++ b/hotspot/src/share/vm/oops/instanceKlass.hpp	Thu Oct 30 13:03:30 2014 +0100
@@ -742,6 +742,7 @@
   void set_osr_nmethods_head(nmethod* h)     { _osr_nmethods_head = h; };
   void add_osr_nmethod(nmethod* n);
   void remove_osr_nmethod(nmethod* n);
+  int mark_osr_nmethods(const Method* m);
   nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
 
   // Breakpoint support (see methods on Method* for details)
diff -r b276c91c1264 -r b4b185d05bb5 hotspot/src/share/vm/oops/method.hpp
--- a/hotspot/src/share/vm/oops/method.hpp	Wed Oct 29 15:42:48 2014 +0100
+++ b/hotspot/src/share/vm/oops/method.hpp	Thu Oct 30 13:03:30 2014 +0100
@@ -813,6 +813,10 @@
    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
   }
 
+  int mark_osr_nmethods() {
+    return method_holder()->mark_osr_nmethods(this);
+  }
+
   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
   }
diff -r b276c91c1264 -r b4b185d05bb5 hotspot/src/share/vm/prims/whitebox.cpp
--- a/hotspot/src/share/vm/prims/whitebox.cpp	Wed Oct 29 15:42:48 2014 +0100
+++ b/hotspot/src/share/vm/prims/whitebox.cpp	Thu Oct 30 13:03:30 2014 +0100
@@ -386,19 +386,10 @@
   CHECK_JNI_EXCEPTION_(env, result);
   MutexLockerEx mu(Compile_lock);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
-  nmethod* code;
   if (is_osr) {
-    int bci = InvocationEntryBci;
-    while ((code = mh->lookup_osr_nmethod_for(bci, CompLevel_none, false)) != NULL) {
-      code->mark_for_deoptimization();
-      ++result;
-      bci = code->osr_entry_bci() + 1;
-    }
-  } else {
-    code = mh->code();
-  }
-  if (code != NULL) {
-    code->mark_for_deoptimization();
+    result += mh->mark_osr_nmethods();
+  } else if (mh->code() != NULL) {
+    mh->code()->mark_for_deoptimization();
     ++result;
   }
   result += CodeCache::mark_for_deoptimization(mh());
diff -r b276c91c1264 -r b4b185d05bb5 hotspot/test/compiler/whitebox/DeoptimizeMultipleOSRTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/whitebox/DeoptimizeMultipleOSRTest.java	Thu Oct 30 13:03:30 2014 +0100
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2013, 2014, 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 sun.hotspot.WhiteBox;
+import java.lang.reflect.Executable;
+import java.lang.reflect.Method;
+
+/*
+ * @test DeoptimizeMultipleOSRTest
+ * @bug 8061817
+ * @library /testlibrary /testlibrary/whitebox
+ * @build DeoptimizeMultipleOSRTest
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:CompileCommand=compileonly,DeoptimizeMultipleOSRTest::triggerOSR DeoptimizeMultipleOSRTest
+ * @summary testing of WB::deoptimizeMethod()
+ */
+public class DeoptimizeMultipleOSRTest {
+    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
+    private static final long BACKEDGE_THRESHOLD = 150000;
+    private Method method;
+    private int counter = 0;
+
+    public static void main(String[] args) throws Exception {
+        DeoptimizeMultipleOSRTest test = new DeoptimizeMultipleOSRTest();
+        test.test();
+    }
+
+    /**
+     * Triggers two different OSR compilations for the same method and
+     * checks if WhiteBox.deoptimizeMethod() deoptimizes both.
+     *
+     * @throws Exception
+     */
+    public void test() throws Exception {
+        method = DeoptimizeMultipleOSRTest.class.getDeclaredMethod("triggerOSR", boolean.class, long.class);
+        // Trigger two OSR compiled versions
+        triggerOSR(true, BACKEDGE_THRESHOLD);
+        triggerOSR(false, BACKEDGE_THRESHOLD);
+        // Wait for compilation
+        CompilerWhiteBoxTest.waitBackgroundCompilation(method);
+        // Deoptimize
+        WHITE_BOX.deoptimizeMethod(method, true);
+        if (WHITE_BOX.isMethodCompiled(method, true)) {
+            throw new AssertionError("Not all OSR compiled versions were deoptimized");
+        }
+    }
+
+    /**
+     * Triggers OSR compilations by executing loops.
+     *
+     * @param first Determines which loop to execute
+     * @param limit The number of loop iterations
+     */
+    public void triggerOSR(boolean first, long limit) {
+        if (limit != 1) {
+            // Warmup method to avoid uncommon traps
+            for (int i = 0; i < limit; ++i) {
+                triggerOSR(first, 1);
+            }
+            CompilerWhiteBoxTest.waitBackgroundCompilation(method);
+        }
+        if (first) {
+            // Trigger OSR compilation 1
+            for (int i = 0; i < limit; ++i) {
+                counter++;
+            }
+        } else {
+            // Trigger OSR compilation 2
+            for (int i = 0; i < limit; ++i) {
+                counter++;
+            }
+        }
+    }
+}