CpuProfiler: public API for deopt info in cpu profiler.

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index f9439c2e629445c610b226438a21f82b2687b8de..a5e7d95e067f7c9209dbffc6e511fee7353b0944 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -17,6 +17,33 @@ struct HeapStatsUpdate;
 
 typedef uint32_t SnapshotObjectId;
 
+
+class V8_EXPORT CpuProfileDeoptInfo {
+ public:
+  struct Frame {
+    int script_id;
+    unsigned int position;

[yurys, 2015/03/30 13:20:18]

unsigned

+  };
+
+  /** Retrieves the reason of deopt. */
+  const char* GetDeoptReason() const;
+
+  /**
+   * Retrieves a height of inlined functions stack for the location
+   * where the deopt happened. I.e. if function A inlined B which inlined C
+   * and the deopt happened in the code which belongs to the inlined C
+   * then we will get 3 frames. The first for C where deopt happened.

[alph, 2015/03/30 13:10:33]

... then there will be 3 frames.

+   * The second for B where C was inlined and the third for A where B was
+   * inlined. If there were no inlines then there will be the only frame
+   * for A with the location of the deopt.
+   */
+  unsigned GetFramesCount() const;

[yurys, 2015/03/30 13:20:18]

Why not return a pointer/reference to std::vector<Frame> which would be more
concise and efficient. AFAIU there is no taboo on using STL in V8 public API
anymore, right?

+
+  /** Returns the deopt frame and a few inline frames.*/

[alph, 2015/03/30 13:10:33]

drop 'a few'

+  bool GetCallFrames(Frame* frames, unsigned int length) const;

[yurys, 2015/03/30 13:20:18]

ditto

+};
+
+
 /**
  * CpuProfileNode represents a node in a call graph.
  */
@@ -85,6 +112,12 @@ class V8_EXPORT CpuProfileNode {
   /** Retrieves a child node by index. */
   const CpuProfileNode* GetChild(int index) const;
 
+  /** Retrieves a number of deopts happened on the node. */
+  unsigned GetDeoptCount() const;
+
+  /** Retrieves a particular deopt for the node. */
+  const CpuProfileDeoptInfo* GetDeoptInfo(unsigned index) const;
+
   static const int kNoLineNumberInfo = Message::kNoLineNumberInfo;
   static const int kNoColumnNumberInfo = Message::kNoColumnInfo;
 };