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

include/v8.h

Index: include/v8.h
===================================================================
--- include/v8.h	(revision 13599)
+++ include/v8.h	(working copy)
@@ -3042,8 +3042,17 @@
   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;
@@ -3051,6 +3060,11 @@
   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.
@@ -3061,6 +3075,17 @@
       // 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;
   };