/* * Copyright (C) 2014-2017 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 "GPRInfo.h" namespace JSC { struct EntryFrame; class ExecState; class VM; struct VMEntryRecord { /* * This record stored in a vmEntryTo{JavaScript,Host} allocated frame. It is allocated on the stack * after callee save registers where local variables would go. */ VM* m_vm; ExecState* m_prevTopCallFrame; EntryFrame* m_prevTopEntryFrame; #if ENABLE(JIT) && NUMBER_OF_CALLEE_SAVES_REGISTERS > 0 intptr_t calleeSaveRegistersBuffer[NUMBER_OF_CALLEE_SAVES_REGISTERS]; #endif ExecState* prevTopCallFrame() { return m_prevTopCallFrame; } SUPPRESS_ASAN ExecState* unsafePrevTopCallFrame() { return m_prevTopCallFrame; } EntryFrame* prevTopEntryFrame() { return m_prevTopEntryFrame; } SUPPRESS_ASAN EntryFrame* unsafePrevTopEntryFrame() { return m_prevTopEntryFrame; } }; extern "C" VMEntryRecord* vmEntryRecord(EntryFrame*); struct EntryFrame { #if ENABLE(JIT) && NUMBER_OF_CALLEE_SAVES_REGISTERS > 0 static ptrdiff_t vmEntryRecordOffset() { EntryFrame* fakeEntryFrame = reinterpret_cast<EntryFrame*>(0x1000); VMEntryRecord* record = vmEntryRecord(fakeEntryFrame); return static_cast<ptrdiff_t>( reinterpret_cast<char*>(record) - reinterpret_cast<char*>(fakeEntryFrame)); } static ptrdiff_t calleeSaveRegistersBufferOffset() { return vmEntryRecordOffset() + OBJECT_OFFSETOF(VMEntryRecord, calleeSaveRegistersBuffer); } #endif }; } // namespace JSC