Fix a crash caused by garbage collection during generation of a...

src/ia32/macro-assembler-ia32.cc

 // Copyright 2006-2009 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 997 matching lines @@
   // in initial map.
   bind(&non_instance);
   mov(result, FieldOperand(result, Map::kConstructorOffset));
 
   // All done.
   bind(&done);
 }
 
 
 void MacroAssembler::CallStub(CodeStub* stub) {
-  ASSERT(allow_stub_calls());  // calls are not allowed in some stubs
+  ASSERT(allow_stub_calls());  // Calls are not allowed in some stubs.
   call(stub->GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
+Object* MacroAssembler::TryCallStub(CodeStub* stub) {
+  ASSERT(allow_stub_calls());  // Calls are not allowed in some stubs.
+  Object* result = stub->TryGetCode();
+  if (!result->IsFailure()) {
+    call(Handle<Code>(Code::cast(result)), RelocInfo::CODE_TARGET);
+  }
+  return result;
+}
+
+
 void MacroAssembler::TailCallStub(CodeStub* stub) {
-  ASSERT(allow_stub_calls());  // calls are not allowed in some stubs
+  ASSERT(allow_stub_calls());  // Calls are not allowed in some stubs.
   jmp(stub->GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
+Object* MacroAssembler::TryTailCallStub(CodeStub* stub) {
+  ASSERT(allow_stub_calls());  // Calls are not allowed in some stubs.
+  Object* result = stub->TryGetCode();
+  if (!result->IsFailure()) {
+    jmp(Handle<Code>(Code::cast(result)), RelocInfo::CODE_TARGET);
+  }
+  return result;
+}
+
+
 void MacroAssembler::StubReturn(int argc) {
   ASSERT(argc >= 1 && generating_stub());
   ret((argc - 1) * kPointerSize);
 }
 
 
 void MacroAssembler::IllegalOperation(int num_arguments) {
   if (num_arguments > 0) {
     add(Operand(esp), Immediate(num_arguments * kPointerSize));
   }
@@ skipping 378 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