Move StackTracer to sampler.h

src/sampler.cc

Index: src/sampler.cc
diff --git a/src/sampler.cc b/src/sampler.cc
index 277462977d2ae68cafca1a0426edf1bdb81eee36..2b62c1a22793bd43aa342b3e87ae9fe0ddcc3690 100644
--- a/src/sampler.cc
+++ b/src/sampler.cc
@@ -59,6 +59,7 @@
 
 #include "v8.h"
 
+#include "frames-inl.h"
 #include "log.h"
 #include "platform.h"
 #include "simulator.h"
@@ -641,4 +642,33 @@ void Sampler::SampleStack(TickSample* sample) {
   if (++samples_taken_ < 0) samples_taken_ = 0;
 }
 
+//
+// StackTracer implementation
+//
+DISABLE_ASAN void StackTracer::Trace(Isolate* isolate, TickSample* sample) {
+  ASSERT(isolate->IsInitialized());
+
+  // Avoid collecting traces while doing GC.
+  if (sample->state == GC) return;
+
+  const Address js_entry_sp =
+      Isolate::js_entry_sp(isolate->thread_local_top());
+  if (js_entry_sp == 0) {
+    // Not executing JS now.
+    return;
+  }
+
+  sample->external_callback = isolate->external_callback();
+
+  SafeStackTraceFrameIterator it(isolate,
+                                 sample->fp, sample->sp,
+                                 sample->sp, js_entry_sp);
+  int i = 0;
+  while (!it.done() && i < TickSample::kMaxFramesCount) {
+    sample->stack[i++] = it.frame()->pc();
+    it.Advance();
+  }
+  sample->frames_count = i;
+}
+
 } }  // namespace v8::internal