Fix issues when changing FLAG_concurrent_recompilation after init.

R=jarin@chromium.org
BUG=356053
LOG=N

Review URL: https://codereview.chromium.org/210363005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20228 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -154,7 +154,6 @@ Heap::Heap()
       configured_(false),
       external_string_table_(this),
       chunks_queued_for_free_(NULL),
-      relocation_mutex_(NULL),
       gc_callbacks_depth_(0) {
   // Allow build-time customization of the max semispace size. Building
   // V8 with snapshots and a non-default max semispace size is much
@@ -6595,8 +6594,6 @@ bool Heap::SetUp() {
 
   mark_compact_collector()->SetUp();
 
-  if (FLAG_concurrent_recompilation) relocation_mutex_ = new Mutex;
-
   return true;
 }
 
@@ -6738,9 +6735,6 @@ void Heap::TearDown() {
   incremental_marking()->TearDown();
 
   isolate_->memory_allocator()->TearDown();
-
-  delete relocation_mutex_;
-  relocation_mutex_ = NULL;
 }
 
 

src/heap.h

@@ -1906,16 +1906,12 @@ class Heap {
   class RelocationLock {
    public:
     explicit RelocationLock(Heap* heap) : heap_(heap) {
-      if (FLAG_concurrent_recompilation) {
-        heap_->relocation_mutex_->Lock();
-      }
+      heap_->relocation_mutex_.Lock();
     }
 
 
     ~RelocationLock() {
-      if (FLAG_concurrent_recompilation) {
-        heap_->relocation_mutex_->Unlock();
-      }
+      heap_->relocation_mutex_.Unlock();
     }
 
    private:
@@ -2518,7 +2514,7 @@ class Heap {
 
   MemoryChunk* chunks_queued_for_free_;
 
-  Mutex* relocation_mutex_;
+  Mutex relocation_mutex_;
 
   int gc_callbacks_depth_;
 

src/runtime.cc

@@ -8701,6 +8701,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_GetOptimizationStatus) {
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_UnblockConcurrentRecompilation) {
   RUNTIME_ASSERT(FLAG_block_concurrent_recompilation);
+  RUNTIME_ASSERT(isolate->concurrent_recompilation_enabled());
   isolate->optimizing_compiler_thread()->Unblock();
   return isolate->heap()->undefined_value();
 }

test/mjsunit/regress/regress-356053.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --noconcurrent-recompilation --expose-gc --allow-natives-syntax
+
+%SetFlags("--concurrent-recompilation --block-concurrent-recompilation");
+gc();
+try { %UnblockConcurrentRecompilation(); } catch (e) { }