Split TickSample and Sampler.

src/profiler/tick-sample.h

+// Copyright 2013 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.
+
+#ifndef V8_PROFILER_TICK_SAMPLE_H_
+#define V8_PROFILER_TICK_SAMPLE_H_
+
+#include "include/v8.h"
+
+#include "src/base/platform/time.h"
+#include "src/frames.h"
+
+namespace v8 {
+namespace internal {
+
+class Isolate;
+
+// ----------------------------------------------------------------------------
+// Sampler
+//
+// A sampler periodically samples the state of the VM and optionally
+// (if used for profiling) the program counter and stack pointer for
+// the thread that created it.
+
+// TickSample captures the information collected for each sample.
+struct TickSample {
+  // Internal profiling (with --prof + tools/$OS-tick-processor) wants to
+  // include the runtime function we're calling. Externally exposed tick
+  // samples don't care.
+  enum RecordCEntryFrame { kIncludeCEntryFrame, kSkipCEntryFrame };
+
+  TickSample()
+      : state(OTHER),
+        pc(NULL),
+        external_callback_entry(NULL),
+        frames_count(0),
+        has_external_callback(false),
+        update_stats(true),
+        top_frame_type(StackFrame::NONE) {}
+  void Init(Isolate* isolate, const v8::RegisterState& state,
+            RecordCEntryFrame record_c_entry_frame, bool update_stats);
+  static void GetStackSample(Isolate* isolate, const v8::RegisterState& state,
+                             RecordCEntryFrame record_c_entry_frame,
+                             void** frames, size_t frames_limit,
+                             v8::SampleInfo* sample_info);
+  StateTag state;  // The state of the VM.
+  Address pc;      // Instruction pointer.
+  union {
+    Address tos;   // Top stack value (*sp).
+    Address external_callback_entry;
+  };
+  static const unsigned kMaxFramesCountLog2 = 8;
+  static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1;
+  Address stack[kMaxFramesCount];  // Call stack.
+  base::TimeTicks timestamp;
+  unsigned frames_count : kMaxFramesCountLog2;  // Number of captured frames.
+  bool has_external_callback : 1;
+  bool update_stats : 1;  // Whether the sample should update aggregated stats.
+  StackFrame::Type top_frame_type : 5;
+};
+
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_PROFILER_TICK_SAMPLE_H_