--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/code/compiledMethod.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,701 @@
+/*
+ * Copyright (c) 2015, 2017, 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 "code/compiledIC.hpp"
+#include "code/compiledMethod.inline.hpp"
+#include "code/scopeDesc.hpp"
+#include "code/codeCache.hpp"
+#include "prims/methodHandles.hpp"
+#include "interpreter/bytecode.hpp"
+#include "memory/resourceArea.hpp"
+#include "runtime/mutexLocker.hpp"
+
+CompiledMethod::CompiledMethod(Method* method, const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments)
+  : CodeBlob(name, type, layout, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
+  _method(method), _mark_for_deoptimization_status(not_marked) {
+  init_defaults();
+}
+
+CompiledMethod::CompiledMethod(Method* method, const char* name, CompilerType type, int size, int header_size, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments)
+  : CodeBlob(name, type, CodeBlobLayout((address) this, size, header_size, cb), cb, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
+  _method(method), _mark_for_deoptimization_status(not_marked) {
+  init_defaults();
+}
+
+void CompiledMethod::init_defaults() {
+  _has_unsafe_access          = 0;
+  _has_method_handle_invokes  = 0;
+  _lazy_critical_native       = 0;
+  _has_wide_vectors           = 0;
+  _unloading_clock            = 0;
+}
+
+bool CompiledMethod::is_method_handle_return(address return_pc) {
+  if (!has_method_handle_invokes())  return false;
+  PcDesc* pd = pc_desc_at(return_pc);
+  if (pd == NULL)
+    return false;
+  return pd->is_method_handle_invoke();
+}
+
+// Returns a string version of the method state.
+const char* CompiledMethod::state() const {
+  int state = get_state();
+  switch (state) {
+  case in_use:
+    return "in use";
+  case not_used:
+    return "not_used";
+  case not_entrant:
+    return "not_entrant";
+  case zombie:
+    return "zombie";
+  case unloaded:
+    return "unloaded";
+  default:
+    fatal("unexpected method state: %d", state);
+    return NULL;
+  }
+}
+
+//-----------------------------------------------------------------------------
+
+void CompiledMethod::add_exception_cache_entry(ExceptionCache* new_entry) {
+  assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
+  assert(new_entry != NULL,"Must be non null");
+  assert(new_entry->next() == NULL, "Must be null");
+
+  ExceptionCache *ec = exception_cache();
+  if (ec != NULL) {
+    new_entry->set_next(ec);
+  }
+  release_set_exception_cache(new_entry);
+}
+
+void CompiledMethod::clean_exception_cache(BoolObjectClosure* is_alive) {
+  ExceptionCache* prev = NULL;
+  ExceptionCache* curr = exception_cache();
+
+  while (curr != NULL) {
+    ExceptionCache* next = curr->next();
+
+    Klass* ex_klass = curr->exception_type();
+    if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
+      if (prev == NULL) {
+        set_exception_cache(next);
+      } else {
+        prev->set_next(next);
+      }
+      delete curr;
+      // prev stays the same.
+    } else {
+      prev = curr;
+    }
+
+    curr = next;
+  }
+}
+
+// public method for accessing the exception cache
+// These are the public access methods.
+address CompiledMethod::handler_for_exception_and_pc(Handle exception, address pc) {
+  // We never grab a lock to read the exception cache, so we may
+  // have false negatives. This is okay, as it can only happen during
+  // the first few exception lookups for a given nmethod.
+  ExceptionCache* ec = exception_cache();
+  while (ec != NULL) {
+    address ret_val;
+    if ((ret_val = ec->match(exception,pc)) != NULL) {
+      return ret_val;
+    }
+    ec = ec->next();
+  }
+  return NULL;
+}
+
+void CompiledMethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
+  // There are potential race conditions during exception cache updates, so we
+  // must own the ExceptionCache_lock before doing ANY modifications. Because
+  // we don't lock during reads, it is possible to have several threads attempt
+  // to update the cache with the same data. We need to check for already inserted
+  // copies of the current data before adding it.
+
+  MutexLocker ml(ExceptionCache_lock);
+  ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
+
+  if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
+    target_entry = new ExceptionCache(exception,pc,handler);
+    add_exception_cache_entry(target_entry);
+  }
+}
+
+//-------------end of code for ExceptionCache--------------
+
+// private method for handling exception cache
+// These methods are private, and used to manipulate the exception cache
+// directly.
+ExceptionCache* CompiledMethod::exception_cache_entry_for_exception(Handle exception) {
+  ExceptionCache* ec = exception_cache();
+  while (ec != NULL) {
+    if (ec->match_exception_with_space(exception)) {
+      return ec;
+    }
+    ec = ec->next();
+  }
+  return NULL;
+}
+
+bool CompiledMethod::is_at_poll_return(address pc) {
+  RelocIterator iter(this, pc, pc+1);
+  while (iter.next()) {
+    if (iter.type() == relocInfo::poll_return_type)
+      return true;
+  }
+  return false;
+}
+
+
+bool CompiledMethod::is_at_poll_or_poll_return(address pc) {
+  RelocIterator iter(this, pc, pc+1);
+  while (iter.next()) {
+    relocInfo::relocType t = iter.type();
+    if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
+      return true;
+  }
+  return false;
+}
+
+void CompiledMethod::verify_oop_relocations() {
+  // Ensure sure that the code matches the current oop values
+  RelocIterator iter(this, NULL, NULL);
+  while (iter.next()) {
+    if (iter.type() == relocInfo::oop_type) {
+      oop_Relocation* reloc = iter.oop_reloc();
+      if (!reloc->oop_is_immediate()) {
+        reloc->verify_oop_relocation();
+      }
+    }
+  }
+}
+
+
+ScopeDesc* CompiledMethod::scope_desc_at(address pc) {
+  PcDesc* pd = pc_desc_at(pc);
+  guarantee(pd != NULL, "scope must be present");
+  return new ScopeDesc(this, pd->scope_decode_offset(),
+                       pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
+                       pd->return_oop());
+}
+
+ScopeDesc* CompiledMethod::scope_desc_near(address pc) {
+  PcDesc* pd = pc_desc_near(pc);
+  guarantee(pd != NULL, "scope must be present");
+  return new ScopeDesc(this, pd->scope_decode_offset(),
+                       pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
+                       pd->return_oop());
+}
+
+void CompiledMethod::cleanup_inline_caches(bool clean_all/*=false*/) {
+  assert_locked_or_safepoint(CompiledIC_lock);
+
+  // If the method is not entrant or zombie then a JMP is plastered over the
+  // first few bytes.  If an oop in the old code was there, that oop
+  // should not get GC'd.  Skip the first few bytes of oops on
+  // not-entrant methods.
+  address low_boundary = verified_entry_point();
+  if (!is_in_use() && is_nmethod()) {
+    low_boundary += NativeJump::instruction_size;
+    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
+    // This means that the low_boundary is going to be a little too high.
+    // This shouldn't matter, since oops of non-entrant methods are never used.
+    // In fact, why are we bothering to look at oops in a non-entrant method??
+  }
+
+  // Find all calls in an nmethod and clear the ones that point to non-entrant,
+  // zombie and unloaded nmethods.
+  ResourceMark rm;
+  RelocIterator iter(this, low_boundary);
+  while(iter.next()) {
+    switch(iter.type()) {
+      case relocInfo::virtual_call_type:
+      case relocInfo::opt_virtual_call_type: {
+        CompiledIC *ic = CompiledIC_at(&iter);
+        // Ok, to lookup references to zombies here
+        CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
+        if( cb != NULL && cb->is_compiled() ) {
+          CompiledMethod* nm = cb->as_compiled_method();
+          // Clean inline caches pointing to zombie, non-entrant and unloaded methods
+          if (clean_all || !nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
+        }
+        break;
+      }
+      case relocInfo::static_call_type: {
+          CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
+          CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
+          if( cb != NULL && cb->is_compiled() ) {
+            CompiledMethod* cm = cb->as_compiled_method();
+            // Clean inline caches pointing to zombie, non-entrant and unloaded methods
+            if (clean_all || !cm->is_in_use() || (cm->method()->code() != cm)) {
+              csc->set_to_clean();
+            }
+          }
+        break;
+      }
+      default:
+        break;
+    }
+  }
+}
+
+int CompiledMethod::verify_icholder_relocations() {
+  ResourceMark rm;
+  int count = 0;
+
+  RelocIterator iter(this);
+  while(iter.next()) {
+    if (iter.type() == relocInfo::virtual_call_type) {
+      if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc(), this)) {
+        CompiledIC *ic = CompiledIC_at(&iter);
+        if (TraceCompiledIC) {
+          tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
+          ic->print();
+        }
+        assert(ic->cached_icholder() != NULL, "must be non-NULL");
+        count++;
+      }
+    }
+  }
+
+  return count;
+}
+
+// Method that knows how to preserve outgoing arguments at call. This method must be
+// called with a frame corresponding to a Java invoke
+void CompiledMethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
+#ifndef SHARK
+  if (method() != NULL && !method()->is_native()) {
+    address pc = fr.pc();
+    SimpleScopeDesc ssd(this, pc);
+    Bytecode_invoke call(ssd.method(), ssd.bci());
+    bool has_receiver = call.has_receiver();
+    bool has_appendix = call.has_appendix();
+    Symbol* signature = call.signature();
+
+    // The method attached by JIT-compilers should be used, if present.
+    // Bytecode can be inaccurate in such case.
+    Method* callee = attached_method_before_pc(pc);
+    if (callee != NULL) {
+      has_receiver = !(callee->access_flags().is_static());
+      has_appendix = false;
+      signature = callee->signature();
+    }
+
+    fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
+  }
+#endif // !SHARK
+}
+
+Method* CompiledMethod::attached_method(address call_instr) {
+  assert(code_contains(call_instr), "not part of the nmethod");
+  RelocIterator iter(this, call_instr, call_instr + 1);
+  while (iter.next()) {
+    if (iter.addr() == call_instr) {
+      switch(iter.type()) {
+        case relocInfo::static_call_type:      return iter.static_call_reloc()->method_value();
+        case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
+        case relocInfo::virtual_call_type:     return iter.virtual_call_reloc()->method_value();
+        default:                               break;
+      }
+    }
+  }
+  return NULL; // not found
+}
+
+Method* CompiledMethod::attached_method_before_pc(address pc) {
+  if (NativeCall::is_call_before(pc)) {
+    NativeCall* ncall = nativeCall_before(pc);
+    return attached_method(ncall->instruction_address());
+  }
+  return NULL; // not a call
+}
+
+void CompiledMethod::clear_inline_caches() {
+  assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
+  if (is_zombie()) {
+    return;
+  }
+
+  RelocIterator iter(this);
+  while (iter.next()) {
+    iter.reloc()->clear_inline_cache();
+  }
+}
+
+// Clear ICStubs of all compiled ICs
+void CompiledMethod::clear_ic_stubs() {
+  assert_locked_or_safepoint(CompiledIC_lock);
+  RelocIterator iter(this);
+  while(iter.next()) {
+    if (iter.type() == relocInfo::virtual_call_type) {
+      CompiledIC* ic = CompiledIC_at(&iter);
+      ic->clear_ic_stub();
+    }
+  }
+}
+
+#ifdef ASSERT
+
+class CheckClass : AllStatic {
+  static BoolObjectClosure* _is_alive;
+
+  // Check class_loader is alive for this bit of metadata.
+  static void check_class(Metadata* md) {
+    Klass* klass = NULL;
+    if (md->is_klass()) {
+      klass = ((Klass*)md);
+    } else if (md->is_method()) {
+      klass = ((Method*)md)->method_holder();
+    } else if (md->is_methodData()) {
+      klass = ((MethodData*)md)->method()->method_holder();
+    } else {
+      md->print();
+      ShouldNotReachHere();
+    }
+    assert(klass->is_loader_alive(_is_alive), "must be alive");
+  }
+ public:
+  static void do_check_class(BoolObjectClosure* is_alive, CompiledMethod* nm) {
+    assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
+    _is_alive = is_alive;
+    nm->metadata_do(check_class);
+  }
+};
+
+// This is called during a safepoint so can use static data
+BoolObjectClosure* CheckClass::_is_alive = NULL;
+#endif // ASSERT
+
+
+void CompiledMethod::clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
+  if (ic->is_icholder_call()) {
+    // The only exception is compiledICHolder oops which may
+    // yet be marked below. (We check this further below).
+    CompiledICHolder* cichk_oop = ic->cached_icholder();
+
+    if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
+        cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
+      return;
+    }
+  } else {
+    Metadata* ic_oop = ic->cached_metadata();
+    if (ic_oop != NULL) {
+      if (ic_oop->is_klass()) {
+        if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
+          return;
+        }
+      } else if (ic_oop->is_method()) {
+        if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
+          return;
+        }
+      } else {
+        ShouldNotReachHere();
+      }
+    }
+  }
+
+  ic->set_to_clean();
+}
+
+unsigned char CompiledMethod::_global_unloading_clock = 0;
+
+void CompiledMethod::increase_unloading_clock() {
+  _global_unloading_clock++;
+  if (_global_unloading_clock == 0) {
+    // _nmethods are allocated with _unloading_clock == 0,
+    // so 0 is never used as a clock value.
+    _global_unloading_clock = 1;
+  }
+}
+
+void CompiledMethod::set_unloading_clock(unsigned char unloading_clock) {
+  OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
+}
+
+unsigned char CompiledMethod::unloading_clock() {
+  return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
+}
+
+// Processing of oop references should have been sufficient to keep
+// all strong references alive.  Any weak references should have been
+// cleared as well.  Visit all the metadata and ensure that it's
+// really alive.
+void CompiledMethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
+#ifdef ASSERT
+    RelocIterator iter(this, low_boundary);
+    while (iter.next()) {
+    // static_stub_Relocations may have dangling references to
+    // Method*s so trim them out here.  Otherwise it looks like
+    // compiled code is maintaining a link to dead metadata.
+    address static_call_addr = NULL;
+    if (iter.type() == relocInfo::opt_virtual_call_type) {
+      CompiledIC* cic = CompiledIC_at(&iter);
+      if (!cic->is_call_to_interpreted()) {
+        static_call_addr = iter.addr();
+      }
+    } else if (iter.type() == relocInfo::static_call_type) {
+      CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
+      if (!csc->is_call_to_interpreted()) {
+        static_call_addr = iter.addr();
+      }
+    }
+    if (static_call_addr != NULL) {
+      RelocIterator sciter(this, low_boundary);
+      while (sciter.next()) {
+        if (sciter.type() == relocInfo::static_stub_type &&
+            sciter.static_stub_reloc()->static_call() == static_call_addr) {
+          sciter.static_stub_reloc()->clear_inline_cache();
+        }
+      }
+    }
+  }
+  // Check that the metadata embedded in the nmethod is alive
+  CheckClass::do_check_class(is_alive, this);
+#endif
+}
+
+// This is called at the end of the strong tracing/marking phase of a
+// GC to unload an nmethod if it contains otherwise unreachable
+// oops.
+
+void CompiledMethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
+  // Make sure the oop's ready to receive visitors
+  assert(!is_zombie() && !is_unloaded(),
+         "should not call follow on zombie or unloaded nmethod");
+
+  // If the method is not entrant then a JMP is plastered over the
+  // first few bytes.  If an oop in the old code was there, that oop
+  // should not get GC'd.  Skip the first few bytes of oops on
+  // not-entrant methods.
+  address low_boundary = verified_entry_point();
+  if (is_not_entrant()) {
+    low_boundary += NativeJump::instruction_size;
+    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
+    // (See comment above.)
+  }
+
+  // The RedefineClasses() API can cause the class unloading invariant
+  // to no longer be true. See jvmtiExport.hpp for details.
+  // Also, leave a debugging breadcrumb in local flag.
+  if (JvmtiExport::has_redefined_a_class()) {
+    // This set of the unloading_occurred flag is done before the
+    // call to post_compiled_method_unload() so that the unloading
+    // of this nmethod is reported.
+    unloading_occurred = true;
+  }
+
+  // Exception cache
+  clean_exception_cache(is_alive);
+
+  // If class unloading occurred we first iterate over all inline caches and
+  // clear ICs where the cached oop is referring to an unloaded klass or method.
+  // The remaining live cached oops will be traversed in the relocInfo::oop_type
+  // iteration below.
+  if (unloading_occurred) {
+    RelocIterator iter(this, low_boundary);
+    while(iter.next()) {
+      if (iter.type() == relocInfo::virtual_call_type) {
+        CompiledIC *ic = CompiledIC_at(&iter);
+        clean_ic_if_metadata_is_dead(ic, is_alive);
+      }
+    }
+  }
+
+  if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) {
+    return;
+  }
+
+#if INCLUDE_JVMCI
+  if (do_unloading_jvmci(is_alive, unloading_occurred)) {
+    return;
+  }
+#endif
+
+  // Ensure that all metadata is still alive
+  verify_metadata_loaders(low_boundary, is_alive);
+}
+
+template <class CompiledICorStaticCall>
+static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, CompiledMethod* from) {
+  // Ok, to lookup references to zombies here
+  CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
+  CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
+  if (nm != NULL) {
+    if (nm->unloading_clock() != CompiledMethod::global_unloading_clock()) {
+      // The nmethod has not been processed yet.
+      return true;
+    }
+
+    // Clean inline caches pointing to both zombie and not_entrant methods
+    if (!nm->is_in_use() || (nm->method()->code() != nm)) {
+      ic->set_to_clean();
+      assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
+    }
+  }
+
+  return false;
+}
+
+static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, CompiledMethod* from) {
+  return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
+}
+
+static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, CompiledMethod* from) {
+  return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
+}
+
+bool CompiledMethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
+  ResourceMark rm;
+
+  // Make sure the oop's ready to receive visitors
+  assert(!is_zombie() && !is_unloaded(),
+         "should not call follow on zombie or unloaded nmethod");
+
+  // If the method is not entrant then a JMP is plastered over the
+  // first few bytes.  If an oop in the old code was there, that oop
+  // should not get GC'd.  Skip the first few bytes of oops on
+  // not-entrant methods.
+  address low_boundary = verified_entry_point();
+  if (is_not_entrant()) {
+    low_boundary += NativeJump::instruction_size;
+    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
+    // (See comment above.)
+  }
+
+  // The RedefineClasses() API can cause the class unloading invariant
+  // to no longer be true. See jvmtiExport.hpp for details.
+  // Also, leave a debugging breadcrumb in local flag.
+  if (JvmtiExport::has_redefined_a_class()) {
+    // This set of the unloading_occurred flag is done before the
+    // call to post_compiled_method_unload() so that the unloading
+    // of this nmethod is reported.
+    unloading_occurred = true;
+  }
+
+  // Exception cache
+  clean_exception_cache(is_alive);
+
+  bool postponed = false;
+
+  RelocIterator iter(this, low_boundary);
+  while(iter.next()) {
+
+    switch (iter.type()) {
+
+    case relocInfo::virtual_call_type:
+      if (unloading_occurred) {
+        // If class unloading occurred we first iterate over all inline caches and
+        // clear ICs where the cached oop is referring to an unloaded klass or method.
+        clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
+      }
+
+      postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
+      break;
+
+    case relocInfo::opt_virtual_call_type:
+      postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
+      break;
+
+    case relocInfo::static_call_type:
+      postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
+      break;
+
+    case relocInfo::oop_type:
+      // handled by do_unloading_oops below
+      break;
+
+    case relocInfo::metadata_type:
+      break; // nothing to do.
+
+    default:
+      break;
+    }
+  }
+
+  if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) {
+    return postponed;
+  }
+
+#if INCLUDE_JVMCI
+  if (do_unloading_jvmci(is_alive, unloading_occurred)) {
+    return postponed;
+  }
+#endif
+
+  // Ensure that all metadata is still alive
+  verify_metadata_loaders(low_boundary, is_alive);
+
+  return postponed;
+}
+
+void CompiledMethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
+  ResourceMark rm;
+
+  // Make sure the oop's ready to receive visitors
+  assert(!is_zombie(),
+         "should not call follow on zombie nmethod");
+
+  // If the method is not entrant then a JMP is plastered over the
+  // first few bytes.  If an oop in the old code was there, that oop
+  // should not get GC'd.  Skip the first few bytes of oops on
+  // not-entrant methods.
+  address low_boundary = verified_entry_point();
+  if (is_not_entrant()) {
+    low_boundary += NativeJump::instruction_size;
+    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
+    // (See comment above.)
+  }
+
+  RelocIterator iter(this, low_boundary);
+  while(iter.next()) {
+
+    switch (iter.type()) {
+
+    case relocInfo::virtual_call_type:
+      clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
+      break;
+
+    case relocInfo::opt_virtual_call_type:
+      clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
+      break;
+
+    case relocInfo::static_call_type:
+      clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
+      break;
+
+    default:
+      break;
+    }
+  }
+}