Fix data race when concurrent compilation is aborted due to dependency change.

R=marja@chromium.org
BUG=chromium:419189
LOG=N

Review URL: https://codereview.chromium.org/616263003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24361 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler.cc

@@ -52,7 +52,8 @@ CompilationInfo::CompilationInfo(Handle<Script> script, Zone* zone)
       parameter_count_(0),
       optimization_id_(-1),
       ast_value_factory_(NULL),
-      ast_value_factory_owned_(false) {
+      ast_value_factory_owned_(false),
+      aborted_due_to_dependency_change_(false) {
   Initialize(script->GetIsolate(), BASE, zone);
 }
 
@@ -65,7 +66,8 @@ CompilationInfo::CompilationInfo(Isolate* isolate, Zone* zone)
       parameter_count_(0),
       optimization_id_(-1),
       ast_value_factory_(NULL),
-      ast_value_factory_owned_(false) {
+      ast_value_factory_owned_(false),
+      aborted_due_to_dependency_change_(false) {
   Initialize(isolate, STUB, zone);
 }
 
@@ -80,7 +82,8 @@ CompilationInfo::CompilationInfo(Handle<SharedFunctionInfo> shared_info,
       parameter_count_(0),
       optimization_id_(-1),
       ast_value_factory_(NULL),
-      ast_value_factory_owned_(false) {
+      ast_value_factory_owned_(false),
+      aborted_due_to_dependency_change_(false) {
   Initialize(script_->GetIsolate(), BASE, zone);
 }
 
@@ -96,7 +99,8 @@ CompilationInfo::CompilationInfo(Handle<JSFunction> closure, Zone* zone)
       parameter_count_(0),
       optimization_id_(-1),
       ast_value_factory_(NULL),
-      ast_value_factory_owned_(false) {
+      ast_value_factory_owned_(false),
+      aborted_due_to_dependency_change_(false) {
   Initialize(script_->GetIsolate(), BASE, zone);
 }
 
@@ -109,7 +113,8 @@ CompilationInfo::CompilationInfo(HydrogenCodeStub* stub, Isolate* isolate,
       parameter_count_(0),
       optimization_id_(-1),
       ast_value_factory_(NULL),
-      ast_value_factory_owned_(false) {
+      ast_value_factory_owned_(false),
+      aborted_due_to_dependency_change_(false) {
   Initialize(isolate, STUB, zone);
   code_stub_ = stub;
 }
@@ -126,7 +131,8 @@ CompilationInfo::CompilationInfo(
       parameter_count_(0),
       optimization_id_(-1),
       ast_value_factory_(NULL),
-      ast_value_factory_owned_(false) {
+      ast_value_factory_owned_(false),
+      aborted_due_to_dependency_change_(false) {
   Initialize(isolate, BASE, zone);
 }
 

src/compiler.h

@@ -85,8 +85,7 @@ class CompilationInfo {
     kInliningEnabled = 1 << 17,
     kTypingEnabled = 1 << 18,
     kDisableFutureOptimization = 1 << 19,
-    kAbortedDueToDependency = 1 << 20,
-    kToplevel = 1 << 21
+    kToplevel = 1 << 20
   };
 
   CompilationInfo(Handle<JSFunction> closure, Zone* zone);
@@ -371,12 +370,12 @@ class CompilationInfo {
 
   void AbortDueToDependencyChange() {
     DCHECK(!OptimizingCompilerThread::IsOptimizerThread(isolate()));
-    SetFlag(kAbortedDueToDependency);
+    aborted_due_to_dependency_change_ = true;
   }
 
   bool HasAbortedDueToDependencyChange() const {
     DCHECK(!OptimizingCompilerThread::IsOptimizerThread(isolate()));
-    return GetFlag(kAbortedDueToDependency);
+    return aborted_due_to_dependency_change_;
   }
 
   bool HasSameOsrEntry(Handle<JSFunction> function, BailoutId osr_ast_id) {
@@ -515,6 +514,10 @@ class CompilationInfo {
   bool ast_value_factory_owned_;
   AstNode::IdGen ast_node_id_gen_;
 
+  // This flag is used by the main thread to track whether this compilation
+  // should be abandoned due to dependency change.
+  bool aborted_due_to_dependency_change_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };