mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-14 04:40:19 +00:00
95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
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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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#include "Reg.h"
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#include <wtf/Variant.h>
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#if ENABLE(JIT)
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namespace JSC {
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// It is quite unfortunate that 32 bit environment exists on DFG! This means that JSValueRegs contains 2 registers
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// in such an environment. If we use GPRReg and FPRReg in SnippetParams, SnippetParams may contain
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// different number of registers in 32bit and 64bit environments when we pass JSValueRegs, it is confusing.
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// Therefore, we introduce an abstraction that SnippetReg, which is a polymorphic register class. It can refer FPRReg,
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// GPRReg, and "JSValueRegs". Note that isGPR() will return false if the target Reg is "JSValueRegs" even if the
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// environment is 64bit.
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//
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// FIXME: Eventually we should move this class into JSC and make is available for other JIT code.
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// https://bugs.webkit.org/show_bug.cgi?id=162990
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class SnippetReg {
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public:
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enum class Type : uint8_t {
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GPR = 0,
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FPR = 1,
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JSValue = 2,
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};
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SnippetReg(GPRReg reg)
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: m_variant(reg)
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{
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}
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SnippetReg(FPRReg reg)
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: m_variant(reg)
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{
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}
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SnippetReg(JSValueRegs regs)
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: m_variant(regs)
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{
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}
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bool isGPR() const { return m_variant.index() == static_cast<unsigned>(Type::GPR); }
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bool isFPR() const { return m_variant.index() == static_cast<unsigned>(Type::FPR); }
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bool isJSValueRegs() const { return m_variant.index() == static_cast<unsigned>(Type::JSValue); }
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GPRReg gpr() const
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{
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ASSERT(isGPR());
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return WTF::get<GPRReg>(m_variant);
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}
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FPRReg fpr() const
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{
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ASSERT(isFPR());
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return WTF::get<FPRReg>(m_variant);
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}
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JSValueRegs jsValueRegs() const
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{
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ASSERT(isJSValueRegs());
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return WTF::get<JSValueRegs>(m_variant);
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}
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private:
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Variant<GPRReg, FPRReg, JSValueRegs> m_variant;
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};
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}
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#endif
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