1/* 2 * Copyright (C) 2011 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#include "config.h" 27#include "DFGOSRExit.h" 28 29#if ENABLE(DFG_JIT) 30 31#include "DFGAssemblyHelpers.h" 32#include "DFGSpeculativeJIT.h" 33#include "JSCellInlines.h" 34 35namespace JSC { namespace DFG { 36 37OSRExit::OSRExit(ExitKind kind, JSValueSource jsValueSource, MethodOfGettingAValueProfile valueProfile, SpeculativeJIT* jit, unsigned streamIndex, unsigned recoveryIndex) 38 : m_jsValueSource(jsValueSource) 39 , m_valueProfile(valueProfile) 40 , m_patchableCodeOffset(0) 41 , m_codeOrigin(jit->m_codeOriginForOSR) 42 , m_codeOriginForExitProfile(m_codeOrigin) 43 , m_recoveryIndex(recoveryIndex) 44 , m_watchpointIndex(std::numeric_limits<unsigned>::max()) 45 , m_kind(kind) 46 , m_count(0) 47 , m_streamIndex(streamIndex) 48 , m_lastSetOperand(jit->m_lastSetOperand) 49{ 50 ASSERT(m_codeOrigin.isSet()); 51} 52 53void OSRExit::setPatchableCodeOffset(MacroAssembler::PatchableJump check) 54{ 55 m_patchableCodeOffset = check.m_jump.m_label.m_offset; 56} 57 58MacroAssembler::Jump OSRExit::getPatchableCodeOffsetAsJump() const 59{ 60 return MacroAssembler::Jump(AssemblerLabel(m_patchableCodeOffset)); 61} 62 63CodeLocationJump OSRExit::codeLocationForRepatch(CodeBlock* dfgCodeBlock) const 64{ 65 return CodeLocationJump(dfgCodeBlock->getJITCode().dataAddressAtOffset(m_patchableCodeOffset)); 66} 67 68void OSRExit::correctJump(LinkBuffer& linkBuffer) 69{ 70 MacroAssembler::Label label; 71 label.m_label.m_offset = m_patchableCodeOffset; 72 m_patchableCodeOffset = linkBuffer.offsetOf(label); 73} 74 75bool OSRExit::considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock) 76{ 77 FrequentExitSite exitSite; 78 79 if (m_kind == ArgumentsEscaped) { 80 // Count this one globally. It doesn't matter where in the code block the arguments excaped; 81 // the fact that they did is not associated with any particular instruction. 82 exitSite = FrequentExitSite(m_kind); 83 } else 84 exitSite = FrequentExitSite(m_codeOriginForExitProfile.bytecodeIndex, m_kind); 85 86 return baselineCodeBlockForOriginAndBaselineCodeBlock(m_codeOriginForExitProfile, profiledCodeBlock)->addFrequentExitSite(exitSite); 87} 88 89} } // namespace JSC::DFG 90 91#endif // ENABLE(DFG_JIT) 92