mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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91 lines
3.4 KiB
C++
91 lines
3.4 KiB
C++
/*
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* Copyright (C) 2013-2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(DFG_JIT)
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#include "DFGOperations.h"
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#include "DFGSlowPathGenerator.h"
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#include "DFGSpeculativeJIT.h"
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#include <wtf/Vector.h>
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namespace JSC { namespace DFG {
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class SaneStringGetByValSlowPathGenerator final : public JumpingSlowPathGenerator<MacroAssembler::Jump> {
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public:
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SaneStringGetByValSlowPathGenerator(
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const MacroAssembler::Jump& from, SpeculativeJIT* jit, JSValueRegs resultRegs, CCallHelpers::TrustedImmPtr globalObject, GPRReg baseReg, GPRReg propertyReg)
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: JumpingSlowPathGenerator<MacroAssembler::Jump>(from, jit)
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, m_resultRegs(resultRegs)
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, m_globalObject(globalObject)
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, m_baseReg(baseReg)
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, m_propertyReg(propertyReg)
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{
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jit->silentSpillAllRegistersImpl(false, m_plans, extractResult(resultRegs));
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}
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private:
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void generateInternal(SpeculativeJIT* jit) final
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{
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linkFrom(jit);
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MacroAssembler::Jump isNeg = jit->m_jit.branch32(
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MacroAssembler::LessThan, m_propertyReg, MacroAssembler::TrustedImm32(0));
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#if USE(JSVALUE64)
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jit->m_jit.move(
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MacroAssembler::TrustedImm64(JSValue::encode(jsUndefined())), m_resultRegs.gpr());
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#else
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jit->m_jit.move(
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MacroAssembler::TrustedImm32(JSValue::UndefinedTag), m_resultRegs.tagGPR());
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jit->m_jit.move(
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MacroAssembler::TrustedImm32(0), m_resultRegs.payloadGPR());
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#endif
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jumpTo(jit);
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isNeg.link(&jit->m_jit);
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for (unsigned i = 0; i < m_plans.size(); ++i)
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jit->silentSpill(m_plans[i]);
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jit->callOperation(operationGetByValStringInt, extractResult(m_resultRegs), m_globalObject, m_baseReg, m_propertyReg);
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for (unsigned i = m_plans.size(); i--;)
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jit->silentFill(m_plans[i]);
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jit->m_jit.exceptionCheck();
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jumpTo(jit);
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}
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JSValueRegs m_resultRegs;
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CCallHelpers::TrustedImmPtr m_globalObject;
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GPRReg m_baseReg;
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GPRReg m_propertyReg;
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Vector<SilentRegisterSavePlan, 2> m_plans;
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};
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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