[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 273005b8d3cb9b9903c534ca69496ed9fcd93b60..46850e1c9dd10cfe628999bc9b5f475d9a88813b 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -63,6 +63,7 @@ class CompilationInfo BASE_EMBEDDED {
   v8::Extension* extension() const { return extension_; }
   ScriptDataImpl* pre_parse_data() const { return pre_parse_data_; }
   Handle<Context> calling_context() const { return calling_context_; }
+  int osr_ast_id() const { return osr_ast_id_; }
 
   void MarkAsEval() {
     ASSERT(!is_lazy());
@@ -97,10 +98,68 @@ class CompilationInfo BASE_EMBEDDED {
     ASSERT(is_eval());
     calling_context_ = context;
   }
+  void SetOsrAstId(int osr_ast_id) {
+    ASSERT(IsOptimizing());
+    osr_ast_id_ = osr_ast_id;
+  }
+
+  bool has_global_object() const {
+    return !closure().is_null() && (closure()->context()->global() != NULL);
+  }
+
+  GlobalObject* global_object() const {
+    return has_global_object() ? closure()->context()->global() : NULL;
+  }
+
+  // Accessors for the different compilation modes.
+  bool IsOptimizing() const { return mode_ == OPTIMIZE; }
+  bool IsOptimizable() const { return mode_ == BASE; }
+  void SetOptimizing(int osr_ast_id) {
+    SetMode(OPTIMIZE);
+    osr_ast_id_ = osr_ast_id;
+  }
+  void DisableOptimization() { SetMode(NONOPT); }
+
+  // Deoptimization support.
+  bool HasDeoptimizationSupport() const { return supports_deoptimization_; }
+  void EnableDeoptimizationSupport() {
+    ASSERT(IsOptimizable());
+    supports_deoptimization_ = true;
+  }
+
+  // Determine whether or not we can adaptively optimize.
+  bool AllowOptimize() {
+    return V8::UseCrankshaft() &&
+           !closure_.is_null() &&
+           function_->AllowOptimize();
+  }
 
  private:
   Isolate* isolate_;
 
+  // Compilation mode.
+  // BASE is generated by the full codegen, optionally prepared for bailouts.
+  // OPTIMIZE is optimized code generated by the Hydrogen-based backend.
+  // NONOPT is generated by the full codegen or the classic backend
+  //   and is not prepared for recompilation/bailouts. These functions
+  //   are never recompiled.
+  enum Mode {
+    BASE,
+    OPTIMIZE,
+    NONOPT
+  };
+
+  CompilationInfo() : function_(NULL) {}
+
+  void Initialize(Mode mode) {
+    mode_ = V8::UseCrankshaft() ? mode : NONOPT;
+  }
+
+  void SetMode(Mode mode) {
+    ASSERT(V8::UseCrankshaft());
+    mode_ = mode;
+  }
+
   // Flags using template class BitField<type, start, length>.  All are
   // false by default.
   //
@@ -136,6 +195,11 @@ class CompilationInfo BASE_EMBEDDED {
   // handle otherwise.
   Handle<Context> calling_context_;
 
+  // Compilation mode flag and whether deoptimization is allowed.
+  Mode mode_;
+  bool supports_deoptimization_;
+  int osr_ast_id_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };
 
@@ -191,7 +255,6 @@ class Compiler : public AllStatic {
   static bool MakeCodeForLiveEdit(CompilationInfo* info);
 #endif
 
- private:
   static void RecordFunctionCompilation(Logger::LogEventsAndTags tag,
                                         Handle<String> name,
                                         int start_position,