1/* 2 * Copyright (C) 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef FTLForOSREntryJITCode_h 27#define FTLForOSREntryJITCode_h 28 29#if ENABLE(FTL_JIT) 30 31#include "FTLJITCode.h" 32 33namespace JSC { namespace FTL { 34 35// OSR entry into the FTL has a number of quirks: 36// 37// - OSR entry only happens through special OSR entry compilations. They have their 38// own CodeBlock and their own JITCode. 39// 40// - We only OSR enter in loop headers that have a null inline call frame. 41// 42// - Each OSR entry compilation allows entry through only one bytecode index. 43 44class ForOSREntryJITCode : public FTL::JITCode { 45public: 46 ForOSREntryJITCode(); 47 ~ForOSREntryJITCode(); 48 49 void initializeEntryBuffer(VM&, unsigned numCalleeRegisters); 50 ScratchBuffer* entryBuffer() const { return m_entryBuffer; } 51 52 void setBytecodeIndex(unsigned value) { m_bytecodeIndex = value; } 53 unsigned bytecodeIndex() const { return m_bytecodeIndex; } 54 55 void countEntryFailure() { m_entryFailureCount++; } 56 unsigned entryFailureCount() const { return m_entryFailureCount; } 57 58 ForOSREntryJITCode* ftlForOSREntry(); 59 60private: 61 ScratchBuffer* m_entryBuffer; // Only for OSR entry code blocks. 62 unsigned m_bytecodeIndex; 63 unsigned m_entryFailureCount; 64}; 65 66} } // namespace JSC::FTL 67 68#endif // ENABLE(FLT_JIT) 69 70#endif // FTLForOSREntryJITCode_h 71 72