Move StackTracer to sampler.h

Apart from tests Sampler is the only client of StackTracer so it is logical to move it into sampler.h

BUG=None

Review URL: https://codereview.chromium.org/14208012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14298 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/frames.h

@@ -593,7 +593,6 @@ class JavaScriptFrame: public StandardFrame {
   inline Object* function_slot_object() const;
 
   friend class StackFrameIterator;
-  friend class StackTracer;
 };
 
 

src/isolate.h

@@ -649,7 +649,7 @@ class Isolate {
   }
   inline Address* handler_address() { return &thread_local_top_.handler_; }
 
-  // Bottom JS entry (see StackTracer::Trace in log.cc).
+  // Bottom JS entry (see StackTracer::Trace in sampler.cc).
   static Address js_entry_sp(ThreadLocalTop* thread) {
     return thread->js_entry_sp_;
   }

src/log.cc

@@ -111,36 +111,6 @@ class Profiler: public Thread {
 };
 
 
-//
-// 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;
-}
-
-
 //
 // Ticker used to provide ticks to the profiler and the sliding state
 // window.

src/log.h

@@ -466,7 +466,6 @@ class Logger {
   friend class LogMessageBuilder;
   friend class TimeLog;
   friend class Profiler;
-  friend class StackTracer;
   friend class VMState;
 
   friend class LoggerTestHelper;
@@ -505,12 +504,6 @@ class Logger {
 };
 
 
-// Class that extracts stack trace, used for profiling.
-class StackTracer : public AllStatic {
- public:
-  static void Trace(Isolate* isolate, TickSample* sample);
-};
-
 } }  // namespace v8::internal
 
 

src/sampler.cc

@@ -59,6 +59,7 @@
 
 #include "v8.h"
 
+#include "frames-inl.h"
 #include "log.h"
 #include "platform.h"
 #include "simulator.h"
@@ -619,6 +620,34 @@ Mutex* SamplerThread::mutex_ = NULL;
 SamplerThread* SamplerThread::instance_ = NULL;
 
 
+//
+// StackTracer implementation
+//
+DISABLE_ASAN void TickSample::Trace(Isolate* isolate) {
+  ASSERT(isolate->IsInitialized());
+
+  // Avoid collecting traces while doing GC.
+  if (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;
+  }
+
+  external_callback = isolate->external_callback();
+
+  SafeStackTraceFrameIterator it(isolate, fp, sp, sp, js_entry_sp);
+  int i = 0;
+  while (!it.done() && i < TickSample::kMaxFramesCount) {
+    stack[i++] = it.frame()->pc();
+    it.Advance();
+  }
+  frames_count = i;
+}
+
+
 void Sampler::SetUp() {
   SamplerThread::SetUp();
 }
@@ -658,7 +687,7 @@ void Sampler::Stop() {
 }
 
 void Sampler::SampleStack(TickSample* sample) {
-  StackTracer::Trace(isolate_, sample);
+  sample->Trace(isolate_);
   if (++samples_taken_ < 0) samples_taken_ = 0;
 }
 

src/sampler.h

@@ -52,6 +52,7 @@ struct TickSample {
         fp(NULL),
         external_callback(NULL),
         frames_count(0) {}
+  void Trace(Isolate* isolate);
   StateTag state;  // The state of the VM.
   Address pc;      // Instruction pointer.
   Address sp;      // Stack pointer.

test/cctest/test-log-stack-tracer.cc

@@ -51,7 +51,6 @@ using v8::internal::Address;
 using v8::internal::Handle;
 using v8::internal::Isolate;
 using v8::internal::JSFunction;
-using v8::internal::StackTracer;
 using v8::internal::TickSample;
 
 
@@ -70,7 +69,7 @@ static void DoTrace(Address fp) {
   // sp is only used to define stack high bound
   trace_env.sample->sp =
       reinterpret_cast<Address>(trace_env.sample) - 10240;
-  StackTracer::Trace(Isolate::Current(), trace_env.sample);
+  trace_env.sample->Trace(Isolate::Current());
 }
 
 
@@ -258,7 +257,7 @@ static void CreateTraceCallerFunction(const char* func_name,
 
 // This test verifies that stack tracing works when called during
 // execution of a native function called from JS code. In this case,
-// StackTracer uses Isolate::c_entry_fp as a starting point for stack
+// TickSample::Trace uses Isolate::c_entry_fp as a starting point for stack
 // walking.
 TEST(CFromJSStackTrace) {
   // BUG(1303) Inlining of JSFuncDoTrace() in JSTrace below breaks this test.
@@ -285,7 +284,7 @@ TEST(CFromJSStackTrace) {
   //     JSFuncDoTrace() [JS] [captures EBP value and encodes it as Smi]
   //       trace(EBP) [native (extension)]
   //         DoTrace(EBP) [native]
-  //           StackTracer::Trace
+  //           TickSample::Trace
 
   CHECK(sample.external_callback);
   CHECK_EQ(FUNCTION_ADDR(TraceExtension::Trace), sample.external_callback);
@@ -300,9 +299,9 @@ TEST(CFromJSStackTrace) {
 
 
 // This test verifies that stack tracing works when called during
-// execution of JS code. However, as calling StackTracer requires
+// execution of JS code. However, as calling TickSample::Trace requires
 // entering native code, we can only emulate pure JS by erasing
-// Isolate::c_entry_fp value. In this case, StackTracer uses passed frame
+// Isolate::c_entry_fp value. In this case, TickSample::Trace uses passed frame
 // pointer value as a starting point for stack walking.
 TEST(PureJSStackTrace) {
   // This test does not pass with inlining enabled since inlined functions
@@ -334,7 +333,7 @@ TEST(PureJSStackTrace) {
   //       JSFuncDoTrace() [JS]
   //         js_trace(EBP) [native (extension)]
   //           DoTraceHideCEntryFPAddress(EBP) [native]
-  //             StackTracer::Trace
+  //             TickSample::Trace
   //
 
   CHECK(sample.external_callback);
@@ -374,7 +373,7 @@ static int CFunc(int depth) {
 
 
 // This test verifies that stack tracing doesn't crash when called on
-// pure native code. StackTracer only unrolls JS code, so we can't
+// pure native code. TickSample::Trace only unrolls JS code, so we can't
 // get any meaningful info here.
 TEST(PureCStackTrace) {
   TickSample sample;