Merge 6800:7180 from the bleeding edge branch to the experimental/gc branch.

src/platform.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 558 matching lines @@
 // the thread that created it.
 
 // TickSample captures the information collected for each sample.
 class TickSample {
  public:
   TickSample()
       : state(OTHER),
         pc(NULL),
         sp(NULL),
         fp(NULL),
-        function(NULL),
+        tos(NULL),
         frames_count(0) {}
   StateTag state;  // The state of the VM.
-  Address pc;  // Instruction pointer.
-  Address sp;  // Stack pointer.
-  Address fp;  // Frame pointer.
-  Address function;  // The last called JS function.
+  Address pc;   // Instruction pointer.
+  Address sp;   // Stack pointer.
+  Address fp;   // Frame pointer.
+  Address tos;  // Top stack value (*sp).
   static const int kMaxFramesCount = 64;
   Address stack[kMaxFramesCount];  // Call stack.
   int frames_count;  // Number of captured frames.
 };
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 class Sampler {
  public:
   // Initialize sampler.
   explicit Sampler(int interval);
@@ skipping 40 matching lines @@
   PlatformData* data_;  // Platform specific data.
   int samples_taken_;  // Counts stack samples taken.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_