Ensures that GDB prints stacktraces correctly for x64 builds when debugging t...

src/codegen.cc

Index: src/codegen.cc
===================================================================
--- src/codegen.cc	(revision 6445)
+++ src/codegen.cc	(working copy)
@@ -250,7 +250,10 @@
   MacroAssembler masm(NULL, kInitialBufferSize);
 #ifdef ENABLE_GDB_JIT_INTERFACE
   masm.positions_recorder()->StartGDBJITLineInfoRecording();
+#ifdef V8_TARGET_ARCH_X64

[Vyacheslav Egorov (Chromium), 2011/01/25 12:50:11]

Revert this change.

I am considering disabling GDBJIT support in classic codegen completely. 

+  UnwindInfoInterface dummy;
 #endif
+#endif
   CodeGenerator cgen(&masm);
   CodeGeneratorScope scope(&cgen);
   cgen.Generate(info);
@@ -262,6 +265,10 @@
   InLoopFlag in_loop = info->is_in_loop() ? IN_LOOP : NOT_IN_LOOP;
   Code::Flags flags = Code::ComputeFlags(Code::FUNCTION, in_loop);
   Handle<Code> code = MakeCodeEpilogue(cgen.masm(), flags, info);
+
+  SET_UNWIND_INFO_START_ADDRESS(reinterpret_cast<uintptr_t>
+                                (code->instruction_start()));
+
   // There is no stack check table in code generated by the classic backend.
   code->SetNoStackCheckTable();
   CodeGenerator::PrintCode(code, info);