Implemented GetSample.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 3c042d7ab493b5b0b29b8dc57bf4aa99372813aa..8d43f002a6dd8e35f66cccf3fbcb269711f3542c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -40,6 +40,7 @@
 #include "src/prototype.h"
 #include "src/runtime.h"
 #include "src/runtime-profiler.h"
+#include "src/sampler.h"
 #include "src/scanner-character-streams.h"
 #include "src/simulator.h"
 #include "src/snapshot.h"
@@ -6775,6 +6776,18 @@ void Isolate::GetHeapStatistics(HeapStatistics* heap_statistics) {
 }
 
 
+void Isolate::GetSample(void* sp, void* fp, Sample* sample) {

[alph, 2014/09/18 11:34:29]

What about pc register? It is essential to determine the top level function.
TickSample::Init makes use of it.

[gholap, 2014/09/18 23:24:14]

Done.

+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  i::TickSample tick_sample;
+  i::RegisterState state;
+  state.sp = reinterpret_cast<i::Address>(sp);
+  state.fp = reinterpret_cast<i::Address>(fp);
+  tick_sample.Init(isolate, state);
+  sample = new (sample) Sample(&tick_sample.stack[0],
+                               &tick_sample.stack[tick_sample.frames_count]);
+}
+
+
 void Isolate::SetEventLogger(LogEventCallback that) {
   // Do not overwrite the event logger if we want to log explicitly.
   if (i::FLAG_log_timer_events) return;