Put 7942 "Per-isolate embedder-specific data" back

TBR=

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7947 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -2670,6 +2670,17 @@ class V8EXPORT Isolate {
    */
   void Dispose();
 
+  /**
+   * Associate embedder-specific data with the isolate
+   */
+  void SetData(void* data);
+
+  /**
+   * Retrive embedder-specific data from the isolate.
+   * Returns NULL if SetData has never been called.
+   */
+  void* GetData();
+
  private:
 
   Isolate();

src/api.cc

@@ -4870,6 +4870,17 @@ void Isolate::Exit() {
 }
 
 
+void Isolate::SetData(void* data) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->SetData(data);
+}
+
+void* Isolate::GetData() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  return isolate->GetData();
+}
+
+
 String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj)
     : str_(NULL), length_(0) {
   i::Isolate* isolate = i::Isolate::Current();

src/isolate.cc

@@ -1397,7 +1397,8 @@ Isolate::Isolate()
       string_tracker_(NULL),
       regexp_stack_(NULL),
       frame_element_constant_list_(0),
-      result_constant_list_(0) {
+      result_constant_list_(0),
+      embedder_data_(NULL) {
   TRACE_ISOLATE(constructor);
 
   memset(isolate_addresses_, 0,

src/isolate.h

@@ -994,6 +994,9 @@ class Isolate {
 
   void ResetEagerOptimizingData();
 
+  void SetData(void* data) { embedder_data_ = data; }
+  void* GetData() { return embedder_data_; }
+
  private:
   Isolate();
 
@@ -1156,6 +1159,7 @@ class Isolate {
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
   ZoneObjectList frame_element_constant_list_;
   ZoneObjectList result_constant_list_;
+  void* embedder_data_;
 
 #if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
     defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)