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

src/assembler.h

Index: src/assembler.h
===================================================================
--- src/assembler.h	(revision 13276)
+++ src/assembler.h	(working copy)
@@ -831,13 +831,17 @@
 #ifdef ENABLE_GDB_JIT_INTERFACE
     gdbjit_lineinfo_ = NULL;
 #endif
+    jit_code_event_line_info_ = NULL;
   }
 
+~PositionsRecorder() {
 #ifdef ENABLE_GDB_JIT_INTERFACE
-  ~PositionsRecorder() {
     delete gdbjit_lineinfo_;
+#endif
+    delete jit_code_event_line_info_;
   }
 
+#ifdef ENABLE_GDB_JIT_INTERFACE
   void StartGDBJITLineInfoRecording() {
     if (FLAG_gdbjit) {
       gdbjit_lineinfo_ = new GDBJITLineInfo();
@@ -850,7 +854,16 @@
     return lineinfo;
   }
 #endif
+  JITCodeLineInfo* InitializeJITLineInfo() {

[danno, 2013/01/10 16:47:33]

Instead of these routines knowing about JITCodeLineInfo, the should just store a
"void* user_data" in the PositionsRecorder object that gets initialized by the
event handler in user_data in the CODE_START_LINE_INFO_RECORDING event and
passed by V8 back to the event handler for CODE_ADD_LINE_POS_INFO, and
CODE_END_LINE_INFO_RECORDING events. 

[chunyang.dai, 2013/01/18 10:22:44]

Done.

+    jit_code_event_line_info_ = new JITCodeLineInfo();
+    return jit_code_event_line_info_;
+  }
 
+  JITCodeLineInfo* DetachJITLineInfo() {

[danno, 2013/01/10 16:47:33]

Memory management for JITCodeLineInfo (delete) should happen here, not in the
client. See above.

[chunyang.dai, 2013/01/18 10:22:44]

Done.

+    JITCodeLineInfo* lineinfo = jit_code_event_line_info_;
+    jit_code_event_line_info_ = NULL;
+    return lineinfo;
+  }
   // Set current position to pos.
   void RecordPosition(int pos);
 
@@ -866,13 +879,17 @@
     return state_.current_statement_position;
   }
 
+  Assembler* assembler() {
+    return assembler_;
+  }
+
  private:
   Assembler* assembler_;
   PositionState state_;
 #ifdef ENABLE_GDB_JIT_INTERFACE
   GDBJITLineInfo* gdbjit_lineinfo_;
 #endif
-
+  JITCodeLineInfo* jit_code_event_line_info_;
   friend class PreservePositionScope;
 
   DISALLOW_COPY_AND_ASSIGN(PositionsRecorder);