Make assertion scopes thread safe.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 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 1013 matching lines @@
   Handle<DeoptimizationInputData> data =
       factory()->NewDeoptimizationInputData(length, TENURED);
 
   Handle<ByteArray> translations =
       translations_.CreateByteArray(isolate()->factory());
   data->SetTranslationByteArray(*translations);
   data->SetInlinedFunctionCount(Smi::FromInt(inlined_function_count_));
 
   Handle<FixedArray> literals =
       factory()->NewFixedArray(deoptimization_literals_.length(), TENURED);
-  { ALLOW_HANDLE_DEREF(isolate(),
-                       "copying a ZoneList of handles into a FixedArray");
+  { AllowDeferredHandleDereference copy_handles;
     for (int i = 0; i < deoptimization_literals_.length(); i++) {
       literals->set(i, *deoptimization_literals_[i]);
     }
     data->SetLiteralArray(*literals);
   }
 
   data->SetOsrAstId(Smi::FromInt(info_->osr_ast_id().ToInt()));
   data->SetOsrPcOffset(Smi::FromInt(osr_pc_offset_));
 
   // Populate the deoptimization entries.
@@ skipping 757 matching lines @@
         }
       }
     }
   }
 }
 
 
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Register reg = ToRegister(instr->result());
   Handle<Object> handle = instr->value();
-  ALLOW_HANDLE_DEREF(isolate(), "smi check");
+  AllowDeferredHandleDereference smi_check;
   if (handle->IsHeapObject()) {
     __ LoadHeapObject(reg, Handle<HeapObject>::cast(handle));
   } else {
     __ Set(reg, Immediate(handle));
   }
 }
 
 
 void LCodeGen::DoFixedArrayBaseLength(
     LFixedArrayBaseLength* instr) {
@@ skipping 1232 matching lines @@
     }
     __ mov(result, factory()->undefined_value());
   }
 }
 
 
 void LCodeGen::EmitPushTaggedOperand(LOperand* operand) {
   ASSERT(!operand->IsDoubleRegister());
   if (operand->IsConstantOperand()) {
     Handle<Object> object = ToHandle(LConstantOperand::cast(operand));
-    ALLOW_HANDLE_DEREF(isolate(), "smi check");
+    AllowDeferredHandleDereference smi_check;
     if (object->IsSmi()) {
       __ Push(Handle<Smi>::cast(object));
     } else {
       __ PushHeapObject(Handle<HeapObject>::cast(object));
     }
   } else if (operand->IsRegister()) {
     __ push(ToRegister(operand));
   } else {
     __ push(ToOperand(operand));
   }
@@ skipping 3524 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32