Expose TickSample and its APIs in v8-profiler.h

include/v8-profiler.h

 // Copyright 2010 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_V8_PROFILER_H_
 #define V8_V8_PROFILER_H_
 
 #include <vector>
 #include "v8.h"  // NOLINT(build/include)
 
@@ skipping 28 matching lines @@
 };
 
 }  // namespace v8
 
 #ifdef V8_OS_WIN
 template class V8_EXPORT std::vector<v8::CpuProfileDeoptInfo>;
 #endif
 
 namespace v8 {
 
+// 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(nullptr),
+        external_callback_entry(nullptr),
+        frames_count(0),
+        has_external_callback(false),
+        update_stats(true) {}
+  void Init(Isolate* isolate, const v8::RegisterState& state,
+            RecordCEntryFrame record_c_entry_frame, bool update_stats);
+  static bool 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.
+  void* pc;        // Instruction pointer.
+  union {
+    void* tos;  // Top stack value (*sp).
+    void* external_callback_entry;
+  };
+  static const unsigned kMaxFramesCountLog2 = 8;
+  static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1;
+  void* stack[kMaxFramesCount];                 // Call stack.
+  unsigned frames_count : kMaxFramesCountLog2;  // Number of captured frames.
+  bool has_external_callback : 1;
+  bool update_stats : 1;  // Whether the sample should update aggregated stats.
+};
+
 /**
  * CpuProfileNode represents a node in a call graph.
  */
 class V8_EXPORT CpuProfileNode {
  public:
   struct LineTick {
     /** The 1-based number of the source line where the function originates. */
     int line;
 
     /** The count of samples associated with the source line. */
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   uint32_t index;  // Index of the time interval that was changed.
   uint32_t count;  // New value of count field for the interval with this index.
   uint32_t size;  // New value of size field for the interval with this index.
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_V8_PROFILER_H_