This patch is the propagation version of https://codereview.chromium.org/10824032 patch

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3024 matching lines @@
 
 /**
  * A JIT code event is issued each time code is added, moved or removed.
  *
  * \note removal events are not currently issued.
  */
 struct JitCodeEvent {
   enum EventType {
     CODE_ADDED,
     CODE_MOVED,
-    CODE_REMOVED
+    CODE_REMOVED,
+    CODE_ADD_LINE_POS_INFO,
+    CODE_START_LINE_INFO_RECORDING,
+    CODE_END_LINE_INFO_RECORDING
+  };
+  // Definition of the code position type. See comment for
+  // RelocInfo::kNoPosition field.

[danno, 2013/02/06 14:21:34]

This comment refers to internal implementation details (RelocInfo::kNoPosition)
in a public API. If you need to clarify the semantic of this type, please
describe it here completely rather than referring to an internal implementation
detail.

+  enum PositionType {
+    POSITION,
+    STATEMENT_POSITION
   };
 
   // Type of event.
   EventType type;
   // Start of the instructions.
   void* code_start;
   // Size of the instructions.
   size_t code_len;
+  // Script info for CODE_ADDED event.
+  Handle<Script> script;
+  // User-defined data for other events. For example, the line_info_struct
+  // for CODE_ADD_LINE_POS_INFO and CODE_END_LINE_INFO_RECORDING event

[danno, 2013/02/06 14:21:34]

More explanation is needed here, since it's not just for "other events". Right
now, this is just used for *_LINE_INFO_* events, and the semantic (the value
returned from the START_LINE_INFO_RECORDING event in this field is passed to
subsequent CODE_START_LINE_INFO_RECORDING and  CODE_END_LINE_INFO_RECORDING
events) should be captured in the documentation. 

+  void* user_data;
 
   union {
     // Only valid for CODE_ADDED.
     struct {
       // Name of the object associated with the code, note that the string is
       // not zero-terminated.
       const char* str;
       // Number of chars in str.
       size_t len;
     } name;
+
+    // Only valid for CODE_ADD_LINE_POS_INFO
+    struct {
+      // PC offset
+      size_t offset;
+      // Code postion
+      size_t pos;
+      // The position type.
+      PositionType position_type;
+    } line_info;
+
     // New location of instructions. Only valid for CODE_MOVED.
     void* new_code_start;
   };
 };
 
 /**
  * Option flags passed to the SetJitCodeEventHandler function.
  */
 enum JitCodeEventOptions {
   kJitCodeEventDefault = 0,
@@ skipping 1854 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_