Implemented GetSample.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 22 matching lines @@
 #include "src/json-parser.h"
 #include "src/messages.h"
 #include "src/natives.h"
 #include "src/parser.h"
 #include "src/profile-generator-inl.h"
 #include "src/property.h"
 #include "src/property-details.h"
 #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"
 #include "src/unicode-inl.h"
 #include "src/v8threads.h"
 #include "src/version.h"
 #include "src/vm-state-inl.h"
 
 
 #define LOG_API(isolate, expr) LOG(isolate, ApiEntryCall(expr))
@@ skipping 6715 matching lines @@
   i::Heap* heap = isolate->heap();
   heap_statistics->total_heap_size_ = heap->CommittedMemory();
   heap_statistics->total_heap_size_executable_ =
       heap->CommittedMemoryExecutable();
   heap_statistics->total_physical_size_ = heap->CommittedPhysicalMemory();
   heap_statistics->used_heap_size_ = heap->SizeOfObjects();
   heap_statistics->heap_size_limit_ = heap->MaxReserved();
 }
 
 
+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;
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->set_event_logger(that);
 }
 
 
 void Isolate::AddCallCompletedCallback(CallCompletedCallback callback) {
   if (callback == NULL) return;
@@ skipping 957 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal