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

src/code-stubs.cc

Index: src/code-stubs.cc
===================================================================
--- src/code-stubs.cc	(revision 6445)
+++ src/code-stubs.cc	(working copy)
@@ -109,6 +109,20 @@
     RecordCodeGeneration(*new_object, &masm);
     FinishCode(*new_object);
 
+    {

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

Do we really need this piece of code? 

The code stub will be later registered as GDBJITInterface::CodeTag::STUB so at
the time of registration we will be able to say that this is STUB and handle
it's unwinding information accordingly.

+      ZoneScope uinfo(DELETE_ON_EXIT);
+      uintptr_t begin = reinterpret_cast<uintptr_t>
+                        (new_object->instruction_start());
+      uintptr_t size = new_object->instruction_size();
+
+      // This is to prevent compiler errors about begin and end not being
+      // used when SET_UNWIND_INFO_STUB is empty.
+
+      (void) begin;
+      (void) size;
+      SET_UNWIND_INFO_STUB(begin, size);
+    }
+
     // Update the dictionary and the root in Heap.
     Handle<NumberDictionary> dict =
         Factory::DictionaryAtNumberPut(