CpuProfiler: public API for deopt info in cpu profiler.

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 "v8.h"
 
 /**
  * Profiler support for the V8 JavaScript engine.
  */
 namespace v8 {
 
 class HeapGraphNode;
 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.
  */
 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. */
@@ skipping 48 matching lines @@
 
   /** Returns id of the node. The id is unique within the tree */
   unsigned GetNodeId() const;
 
   /** Returns child nodes count of the node. */
   int GetChildrenCount() const;
 
   /** 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;
 };
 
 
 /**
  * CpuProfile contains a CPU profile in a form of top-down call tree
  * (from main() down to functions that do all the work).
  */
 class V8_EXPORT CpuProfile {
@@ skipping 507 matching lines @@
   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_