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

src/x64/virtual-frame-x64.cc

Index: src/x64/virtual-frame-x64.cc
===================================================================
--- src/x64/virtual-frame-x64.cc	(revision 6445)
+++ src/x64/virtual-frame-x64.cc	(working copy)
@@ -30,6 +30,7 @@
 #if defined(V8_TARGET_ARCH_X64)
 
 #include "codegen-inl.h"
+#include "gdb-jit.h"
 #include "register-allocator-inl.h"
 #include "scopes.h"
 #include "stub-cache.h"
@@ -63,8 +64,10 @@
 #endif
 
   EmitPush(rbp);
+  SET_UNWIND_INFO(UNWIND_STATE_AFTER_RBP_PUSH, masm()->pc_offset());

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

The classic codegen is going to be replaced with Crankshaft codegen in the
future.

We think there is no need to change it.

People can run with --always-full-compiler to get debugging information for all
code.

 
   __ movq(rbp, rsp);
+  SET_UNWIND_INFO(UNWIND_STATE_AFTER_RBP_SET, masm()->pc_offset());
 
   // Store the context in the frame.  The context is kept in rsi and a
   // copy is stored in the frame.  The external reference to rsi
@@ -101,6 +104,7 @@
   }
 
   EmitPop(rbp);
+  SET_UNWIND_INFO(UNWIND_STATE_AFTER_RBP_POP, masm()->pc_offset());
 }