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

src/full-codegen.cc

 // Copyright 2010 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 270 matching lines @@
     Counters::total_full_codegen_source_size.Increment(len);
   }
   if (FLAG_trace_codegen) {
     PrintF("Full Compiler - ");
   }
   CodeGenerator::MakeCodePrologue(info);
   const int kInitialBufferSize = 4 * KB;
   MacroAssembler masm(NULL, kInitialBufferSize);
 #ifdef ENABLE_GDB_JIT_INTERFACE
   masm.positions_recorder()->StartGDBJITLineInfoRecording();
+#ifdef V8_TARGET_ARCH_X64
+  UnwindInfoInterface dummy;
+#endif
 #endif
 
   FullCodeGenerator cgen(&masm);
   cgen.Generate(info);
   if (cgen.HasStackOverflow()) {
     ASSERT(!Top::has_pending_exception());
     return false;
   }
   unsigned table_offset = cgen.EmitStackCheckTable();
 
   Code::Flags flags = Code::ComputeFlags(Code::FUNCTION, NOT_IN_LOOP);
   Handle<Code> code = CodeGenerator::MakeCodeEpilogue(&masm, flags, info);
+
+  SET_UNWIND_INFO_START_ADDRESS(reinterpret_cast<uintptr_t>
+                                (code->instruction_start()));
+
   code->set_optimizable(info->IsOptimizable());
   cgen.PopulateDeoptimizationData(code);
   code->set_has_deoptimization_support(info->HasDeoptimizationSupport());
   code->set_allow_osr_at_loop_nesting_level(0);
   code->set_stack_check_table_start(table_offset);
   CodeGenerator::PrintCode(code, info);
   info->SetCode(code);  // may be an empty handle.
 #ifdef ENABLE_GDB_JIT_INTERFACE
   if (FLAG_gdbjit && !code.is_null()) {
     GDBJITLineInfo* lineinfo =
@@ skipping 1072 matching lines @@
   __ Drop(stack_depth);
   __ PopTryHandler();
   return 0;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal