| /* |
| * Copyright (C) 2016 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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 with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include "CatchScope.h" |
| #include "VM.h" |
| |
| namespace JSC { |
| |
| struct VMEntryFrame; |
| |
| class SuspendExceptionScope { |
| public: |
| SuspendExceptionScope(VM* vm) |
| : m_vm(vm) |
| { |
| auto scope = DECLARE_CATCH_SCOPE(*vm); |
| oldException = scope.exception(); |
| scope.clearException(); |
| } |
| ~SuspendExceptionScope() |
| { |
| m_vm->restorePreviousException(oldException); |
| } |
| private: |
| Exception* oldException; |
| VM* m_vm; |
| }; |
| |
| class TopCallFrameSetter { |
| public: |
| TopCallFrameSetter(VM& currentVM, CallFrame* callFrame) |
| : vm(currentVM) |
| , oldCallFrame(currentVM.topCallFrame) |
| { |
| currentVM.topCallFrame = callFrame; |
| } |
| |
| ~TopCallFrameSetter() |
| { |
| vm.topCallFrame = oldCallFrame; |
| } |
| private: |
| VM& vm; |
| CallFrame* oldCallFrame; |
| }; |
| |
| class NativeCallFrameTracer { |
| public: |
| ALWAYS_INLINE NativeCallFrameTracer(VM* vm, CallFrame* callFrame) |
| { |
| ASSERT(vm); |
| ASSERT(callFrame); |
| ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(vm->topVMEntryFrame)); |
| vm->topCallFrame = callFrame; |
| } |
| }; |
| |
| class NativeCallFrameTracerWithRestore { |
| public: |
| ALWAYS_INLINE NativeCallFrameTracerWithRestore(VM* vm, VMEntryFrame* vmEntryFrame, CallFrame* callFrame) |
| : m_vm(vm) |
| { |
| ASSERT(vm); |
| ASSERT(callFrame); |
| m_savedTopVMEntryFrame = vm->topVMEntryFrame; |
| m_savedTopCallFrame = vm->topCallFrame; |
| vm->topVMEntryFrame = vmEntryFrame; |
| vm->topCallFrame = callFrame; |
| } |
| |
| ALWAYS_INLINE ~NativeCallFrameTracerWithRestore() |
| { |
| m_vm->topVMEntryFrame = m_savedTopVMEntryFrame; |
| m_vm->topCallFrame = m_savedTopCallFrame; |
| } |
| |
| private: |
| VM* m_vm; |
| VMEntryFrame* m_savedTopVMEntryFrame; |
| CallFrame* m_savedTopCallFrame; |
| }; |
| |
| } |