mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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132 lines
4.7 KiB
C++
132 lines
4.7 KiB
C++
/*
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* Copyright (C) 2016 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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namespace JSC {
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namespace MacroAssemblerHelpers {
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// True if this:
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// branch8(cond, value, value)
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// Is the same as this:
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// branch32(cond, signExt8(value), signExt8(value))
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template<typename MacroAssemblerType>
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inline bool isSigned(typename MacroAssemblerType::RelationalCondition cond)
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{
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switch (cond) {
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case MacroAssemblerType::Equal:
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case MacroAssemblerType::NotEqual:
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case MacroAssemblerType::GreaterThan:
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case MacroAssemblerType::GreaterThanOrEqual:
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case MacroAssemblerType::LessThan:
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case MacroAssemblerType::LessThanOrEqual:
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return true;
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default:
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return false;
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}
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}
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// True if this:
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// branch8(cond, value, value)
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// Is the same as this:
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// branch32(cond, zeroExt8(value), zeroExt8(value))
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template<typename MacroAssemblerType>
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inline bool isUnsigned(typename MacroAssemblerType::RelationalCondition cond)
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{
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switch (cond) {
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case MacroAssemblerType::Equal:
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case MacroAssemblerType::NotEqual:
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case MacroAssemblerType::Above:
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case MacroAssemblerType::AboveOrEqual:
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case MacroAssemblerType::Below:
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case MacroAssemblerType::BelowOrEqual:
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return true;
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default:
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return false;
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}
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}
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// True if this:
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// test8(cond, value, value)
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// Is the same as this:
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// test32(cond, signExt8(value), signExt8(value))
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template<typename MacroAssemblerType>
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inline bool isSigned(typename MacroAssemblerType::ResultCondition cond)
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{
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switch (cond) {
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case MacroAssemblerType::Signed:
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case MacroAssemblerType::PositiveOrZero:
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case MacroAssemblerType::Zero:
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case MacroAssemblerType::NonZero:
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return true;
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default:
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return false;
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}
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}
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// True if this:
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// test8(cond, value, value)
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// Is the same as this:
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// test32(cond, zeroExt8(value), zeroExt8(value))
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template<typename MacroAssemblerType>
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inline bool isUnsigned(typename MacroAssemblerType::ResultCondition cond)
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{
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switch (cond) {
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case MacroAssemblerType::Zero:
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case MacroAssemblerType::NonZero:
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return true;
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default:
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return false;
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}
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}
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template<typename MacroAssemblerType>
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inline typename MacroAssemblerType::TrustedImm32 mask8OnCondition(MacroAssemblerType&, typename MacroAssemblerType::RelationalCondition cond, typename MacroAssemblerType::TrustedImm32 value)
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{
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if (isUnsigned<MacroAssemblerType>(cond))
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return typename MacroAssemblerType::TrustedImm32(static_cast<uint8_t>(value.m_value));
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return typename MacroAssemblerType::TrustedImm32(static_cast<int8_t>(value.m_value));
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}
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template<typename MacroAssemblerType>
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inline typename MacroAssemblerType::TrustedImm32 mask8OnCondition(MacroAssemblerType&, typename MacroAssemblerType::ResultCondition cond, typename MacroAssemblerType::TrustedImm32 value)
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{
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if (isUnsigned<MacroAssemblerType>(cond))
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return typename MacroAssemblerType::TrustedImm32(static_cast<uint8_t>(value.m_value));
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ASSERT_WITH_MESSAGE(cond != MacroAssemblerType::Overflow, "Overflow is not used for 8bit test operations.");
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ASSERT(isSigned<MacroAssemblerType>(cond));
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return typename MacroAssemblerType::TrustedImm32(static_cast<int8_t>(value.m_value));
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}
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template<typename MacroAssemblerType, typename Condition, typename ...Args>
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void load8OnCondition(MacroAssemblerType& jit, Condition cond, Args... args)
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{
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if (isUnsigned<MacroAssemblerType>(cond))
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return jit.load8(std::forward<Args>(args)...);
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return jit.load8SignedExtendTo32(std::forward<Args>(args)...);
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}
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} } // namespace JSC
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