Make the debugger completely unload when the debug event listener is unregist...

src/debug-ia32.cc

 // Copyright 2006-2008 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 19 matching lines @@
 #include "codegen-inl.h"
 #include "debug.h"
 
 
 namespace v8 { namespace internal {
 
 
 // A debug break in the frame exit code is identified by a call instruction.
 bool BreakLocationIterator::IsDebugBreakAtReturn() {
   // Opcode E8 is call.
-  return (*(rinfo()->pc()) == 0xE8);
+  return Debug::IsDebugBreakAtReturn(rinfo());
 }
 
 
 // Patch the JS frame exit code with a debug break call. See
 // CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-ia32.cc
 // for the precise return instructions sequence.
 void BreakLocationIterator::SetDebugBreakAtReturn() {
   ASSERT(Debug::kIa32JSReturnSequenceLength >=
          Debug::kIa32CallInstructionLength);
   rinfo()->PatchCodeWithCall(Debug::debug_break_return_entry()->entry(),
       Debug::kIa32JSReturnSequenceLength - Debug::kIa32CallInstructionLength);
 }
 
 
 // Restore the JS frame exit code.
 void BreakLocationIterator::ClearDebugBreakAtReturn() {
   rinfo()->PatchCode(original_rinfo()->pc(),
                      Debug::kIa32JSReturnSequenceLength);
 }
 
 
+// Check whether the JS frame exit code has been patched with a debug break.
+bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) {
+  ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()));
+  // Opcode E8 is call.
+  return (*(rinfo->pc()) == 0xE8);
+}
+
+
 #define __ masm->
 
 
 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
                                           RegList pointer_regs,
                                           bool convert_call_to_jmp) {
   // Save the content of all general purpose registers in memory. This copy in
   // memory is later pushed onto the JS expression stack for the fake JS frame
   // generated and also to the C frame generated on top of that. In the JS
   // frame ONLY the registers containing pointers will be pushed on the
@@ skipping 129 matching lines @@
   //  No registers used on entry.
   // -----------------------------------
   Generate_DebugBreakCallHelper(masm, 0, false);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal