Make Isolate::GetStackSample API support simulator

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 47fc1ce1b2f62ba22dd739aeba225c14da1b9230..41517249624e7b716ef538f5a7a32b50c23819d7 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7522,7 +7522,14 @@ bool Isolate::GetHeapObjectStatisticsAtLastGC(
 void Isolate::GetStackSample(const RegisterState& state, void** frames,
                              size_t frames_limit, SampleInfo* sample_info) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
-  i::TickSample::GetStackSample(isolate, state, i::TickSample::kSkipCEntryFrame,
+  RegisterState regs;
+  regs.pc = state.pc;

[alph, 2016/04/29 18:55:06]

nit: you don't need to do the copy for non-simulator case.

[lpy, 2016/04/29 19:51:58]

Done.

+  regs.sp = state.sp;
+  regs.fp = state.fp;
+#if defined(USE_SIMULATOR)
+  i::SimulatorHelper::FillRegisters(isolate, &regs);
+#endif
+  i::TickSample::GetStackSample(isolate, regs, i::TickSample::kSkipCEntryFrame,
                                 frames, frames_limit, sample_info);
 }