1/*
2 * Copyright (C) 2013-2017 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#pragma once
27
28#if ENABLE(DFG_JIT)
29
30#include "DFGOperations.h"
31#include "DFGSlowPathGenerator.h"
32#include "DFGSpeculativeJIT.h"
33#include <wtf/Vector.h>
34
35namespace JSC { namespace DFG {
36
37class SaneStringGetByValSlowPathGenerator : public JumpingSlowPathGenerator<MacroAssembler::Jump> {
38public:
39 SaneStringGetByValSlowPathGenerator(
40 const MacroAssembler::Jump& from, SpeculativeJIT* jit, JSValueRegs resultRegs,
41 GPRReg baseReg, GPRReg propertyReg)
42 : JumpingSlowPathGenerator<MacroAssembler::Jump>(from, jit)
43 , m_resultRegs(resultRegs)
44 , m_baseReg(baseReg)
45 , m_propertyReg(propertyReg)
46 {
47 jit->silentSpillAllRegistersImpl(false, m_plans, extractResult(resultRegs));
48 }
49
50protected:
51 void generateInternal(SpeculativeJIT* jit) override
52 {
53 linkFrom(jit);
54
55 MacroAssembler::Jump isNeg = jit->m_jit.branch32(
56 MacroAssembler::LessThan, m_propertyReg, MacroAssembler::TrustedImm32(0));
57
58#if USE(JSVALUE64)
59 jit->m_jit.move(
60 MacroAssembler::TrustedImm64(JSValue::encode(jsUndefined())), m_resultRegs.gpr());
61#else
62 jit->m_jit.move(
63 MacroAssembler::TrustedImm32(JSValue::UndefinedTag), m_resultRegs.tagGPR());
64 jit->m_jit.move(
65 MacroAssembler::TrustedImm32(0), m_resultRegs.payloadGPR());
66#endif
67 jumpTo(jit);
68
69 isNeg.link(&jit->m_jit);
70
71 for (unsigned i = 0; i < m_plans.size(); ++i)
72 jit->silentSpill(m_plans[i]);
73 jit->callOperation(operationGetByValStringInt, extractResult(m_resultRegs), m_baseReg, m_propertyReg);
74 for (unsigned i = m_plans.size(); i--;)
75 jit->silentFill(m_plans[i]);
76 jit->m_jit.exceptionCheck();
77
78 jumpTo(jit);
79 }
80
81private:
82 JSValueRegs m_resultRegs;
83 GPRReg m_baseReg;
84 GPRReg m_propertyReg;
85 Vector<SilentRegisterSavePlan, 2> m_plans;
86};
87
88} } // namespace JSC::DFG
89
90#endif // ENABLE(DFG_JIT)
91