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 3022 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. The "POSITION" type means the place
+  // in the source code which are of interest when making stack traces to
+  // pin-point the source location of a stack frame as close as possible.
+  // The "STATEMENT_POSITION" means the place at the beginning of each
+  // statement, and is used to indicate possible break locations.
+  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 *_LINE_INFO_* event. It's used to hold the source
+  // code line information which is returned from the
+  // CODE_START_LINE_INFO_RECORDING event. And it's passed to subsequent
+  // CODE_ADD_LINE_POS_INFO and CODE_END_LINE_INFO_RECORDING events.
+  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 1852 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_