Make it possible to add more than one piece of embedder data to isolates

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 1d45de97b8ee88009c9aa8d3183ecc5a3dbbb0d3..77e4595b72e324a4ee29450422b849cf907c8002 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1050,8 +1050,8 @@ class Isolate {
     thread_local_top_.current_vm_state_ = state;
   }
 
-  void SetData(void* data) { embedder_data_ = data; }
-  void* GetData() { return embedder_data_; }
+  void SetData(uint32_t slot, void* data) { embedder_data_[slot] = data; }

[Sven Panne, 2013/11/20 10:03:02]

An ASSERT that slot is in range might be nice here and below.

+  void* GetData(uint32_t slot) { return embedder_data_[slot]; }
 
   LookupResult* top_lookup_result() {
     return thread_local_top_.top_lookup_result_;
@@ -1165,7 +1165,7 @@ class Isolate {
   // with v8::internal::Internals (in include/v8.h) constants. This is also
   // verified in Isolate::Init() using runtime checks.
   State state_;  // Will be padded to kApiPointerSize.
-  void* embedder_data_;
+  void* embedder_data_[Internals::kNumIsolateDataSlots];
   Heap heap_;
 
   // The per-process lock should be acquired before the ThreadDataTable is