mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013, 2014, 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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#if ENABLE(DFG_JIT)
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#include "DFGCommon.h"
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#include "DFGFrozenValue.h"
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#include "GPRInfo.h"
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#include <wtf/text/StringImpl.h>
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namespace JSC {
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class CCallHelpers;
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namespace DFG {
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class Graph;
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// Represents either a JSValue, or for JSValues that require allocation in the heap,
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// it tells you everything you'd need to know in order to allocate it.
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class LazyJSValue {
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public:
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enum LazinessKind {
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KnownValue,
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SingleCharacterString,
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KnownStringImpl,
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NewStringImpl
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};
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LazyJSValue(FrozenValue* value = FrozenValue::emptySingleton())
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: m_kind(KnownValue)
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{
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u.value = value;
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}
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static LazyJSValue singleCharacterString(UChar character)
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{
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LazyJSValue result;
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result.m_kind = SingleCharacterString;
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result.u.character = character;
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return result;
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}
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static LazyJSValue knownStringImpl(StringImpl* string)
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{
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LazyJSValue result;
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result.m_kind = KnownStringImpl;
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result.u.stringImpl = string;
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return result;
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}
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static LazyJSValue newString(Graph&, const String&);
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LazinessKind kind() const { return m_kind; }
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SpeculatedType speculatedType() const { return kind() == KnownValue ? SpecBytecodeTop : SpecString; }
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FrozenValue* tryGetValue(Graph&) const
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{
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if (m_kind == KnownValue)
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return value();
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return nullptr;
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}
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JSValue getValue(VM&) const;
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FrozenValue* value() const
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{
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ASSERT(m_kind == KnownValue);
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return u.value;
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}
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UChar character() const
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{
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ASSERT(m_kind == SingleCharacterString);
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return u.character;
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}
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const StringImpl* tryGetStringImpl(VM&) const;
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String tryGetString(Graph&) const;
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StringImpl* stringImpl() const
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{
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ASSERT(m_kind == KnownStringImpl || m_kind == NewStringImpl);
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return u.stringImpl;
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}
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TriState strictEqual(const LazyJSValue& other) const;
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uintptr_t switchLookupValue(SwitchKind) const;
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void emit(CCallHelpers&, JSValueRegs) const;
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void dump(PrintStream&) const;
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void dumpInContext(PrintStream&, DumpContext*) const;
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private:
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union {
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FrozenValue* value;
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UChar character;
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StringImpl* stringImpl;
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} u;
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LazinessKind m_kind;
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};
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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