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 DFGSaneStringGetByValSlowPathGenerator_h
27#define DFGSaneStringGetByValSlowPathGenerator_h
28
29#if ENABLE(DFG_JIT)
30
31#include "DFGCommon.h"
32#include "DFGOperations.h"
33#include "DFGSlowPathGenerator.h"
34#include "DFGSpeculativeJIT.h"
35#include <wtf/Vector.h>
36
37namespace JSC { namespace DFG {
38
39class SaneStringGetByValSlowPathGenerator : public JumpingSlowPathGenerator<MacroAssembler::Jump> {
40public:
41    SaneStringGetByValSlowPathGenerator(
42        const MacroAssembler::Jump& from, SpeculativeJIT* jit, JSValueRegs resultRegs,
43        GPRReg baseReg, GPRReg propertyReg)
44        : JumpingSlowPathGenerator<MacroAssembler::Jump>(from, jit)
45        , m_resultRegs(resultRegs)
46        , m_baseReg(baseReg)
47        , m_propertyReg(propertyReg)
48    {
49        jit->silentSpillAllRegistersImpl(false, m_plans, extractResult(resultRegs));
50    }
51
52protected:
53    virtual void generateInternal(SpeculativeJIT* jit) override
54    {
55        linkFrom(jit);
56
57        MacroAssembler::Jump isNeg = jit->m_jit.branch32(
58            MacroAssembler::LessThan, m_propertyReg, MacroAssembler::TrustedImm32(0));
59
60#if USE(JSVALUE64)
61        jit->m_jit.move(
62            MacroAssembler::TrustedImm64(JSValue::encode(jsUndefined())), m_resultRegs.gpr());
63#else
64        jit->m_jit.move(
65            MacroAssembler::TrustedImm32(JSValue::UndefinedTag), m_resultRegs.tagGPR());
66        jit->m_jit.move(
67            MacroAssembler::TrustedImm32(0), m_resultRegs.payloadGPR());
68#endif
69        jumpTo(jit);
70
71        isNeg.link(&jit->m_jit);
72
73        for (unsigned i = 0; i < m_plans.size(); ++i)
74            jit->silentSpill(m_plans[i]);
75        jit->callOperation(operationGetByValStringInt, extractResult(m_resultRegs), m_baseReg, m_propertyReg);
76        GPRReg canTrample = SpeculativeJIT::pickCanTrample(extractResult(m_resultRegs));
77        for (unsigned i = m_plans.size(); i--;)
78            jit->silentFill(m_plans[i], canTrample);
79
80        jumpTo(jit);
81    }
82
83private:
84    JSValueRegs m_resultRegs;
85    GPRReg m_baseReg;
86    GPRReg m_propertyReg;
87    Vector<SilentRegisterSavePlan, 2> m_plans;
88};
89
90} } // namespace JSC::DFG
91
92#endif // ENABLE(DFG_JIT)
93
94#endif // DFGSaneStringGetByValSlowPathGenerator_h
95
96