- Pass the knowledge whether the old GC is compacting to the GC prologue and ...

src/macro-assembler-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 21 matching lines @@
 #include "debug.h"
 #include "runtime.h"
 #include "serialize.h"
 
 namespace v8 { namespace internal {
 
 MacroAssembler::MacroAssembler(void* buffer, int size)
     : Assembler(buffer, size),
       unresolved_(0),
       generating_stub_(false),
-      allow_stub_calls_(true) {
+      allow_stub_calls_(true),
+      code_object_(Heap::undefined_value()) {
 }
 
 
 static void RecordWriteHelper(MacroAssembler* masm,
                               Register object,
                               Register addr,
                               Register scratch) {
   Label fast;
 
   // Compute the page address from the heap object pointer, leave it
@@ skipping 257 matching lines @@
   sahf();
   pop(eax);
 }
 
 
 void MacroAssembler::EnterFrame(StackFrame::Type type) {
   push(ebp);
   mov(ebp, Operand(esp));
   push(esi);
   push(Immediate(Smi::FromInt(type)));
-  push(Immediate(0));  // Push an empty code cache slot.
+  push(Immediate(CodeObject()));
+  if (FLAG_debug_code) {
+    cmp(Operand(esp, 0), Immediate(Factory::undefined_value()));
+    Check(not_equal, "code object not properly patched");
+  }
 }
 
 
 void MacroAssembler::LeaveFrame(StackFrame::Type type) {
   if (FLAG_debug_code) {
     cmp(Operand(ebp, StandardFrameConstants::kMarkerOffset),
         Immediate(Smi::FromInt(type)));
     Check(equal, "stack frame types must match");
   }
   leave();
@@ skipping 676 matching lines @@
   // Indicate that code has changed.
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 
 } }  // namespace v8::internal