Initial implementation of GetStackSample sampling profiler API.

src/sampler.h

Index: src/sampler.h
diff --git a/src/sampler.h b/src/sampler.h
index c3dce4ed7c2fec7e353cb06d1641f63e82092a84..a86ff19020979562d8608c7ae4d4ee779b79258f 100644
--- a/src/sampler.h
+++ b/src/sampler.h
@@ -5,6 +5,8 @@
 #ifndef V8_SAMPLER_H_
 #define V8_SAMPLER_H_
 
+#include "include/v8.h"
+
 #include "src/base/atomicops.h"
 #include "src/frames.h"
 #include "src/globals.h"
@@ -21,13 +23,6 @@ class Isolate;
 // (if used for profiling) the program counter and stack pointer for
 // the thread that created it.
 
-struct RegisterState {
-  RegisterState() : pc(NULL), sp(NULL), fp(NULL) {}
-  Address pc;      // Instruction pointer.
-  Address sp;      // Stack pointer.
-  Address fp;      // Frame pointer.
-};
-
 // TickSample captures the information collected for each sample.
 struct TickSample {
   TickSample()
@@ -37,7 +32,9 @@ struct TickSample {
         frames_count(0),
         has_external_callback(false),
         top_frame_type(StackFrame::NONE) {}
-  void Init(Isolate* isolate, const RegisterState& state);
+  void Init(Isolate* isolate, const v8::RegisterState& state);
+  static int GetStackSample(Isolate* isolate, const v8::RegisterState& state,
+                            void** frames, int frames_limit);
   StateTag state;  // The state of the VM.
   Address pc;      // Instruction pointer.
   union {
@@ -67,7 +64,7 @@ class Sampler {
   int interval() const { return interval_; }
 
   // Performs stack sampling.
-  void SampleStack(const RegisterState& regs);
+  void SampleStack(const v8::RegisterState& regs);
 
   // Start and stop sampler.
   void Start();