274 lines
7.5 KiB
C++
274 lines
7.5 KiB
C++
/*
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* Copyright (C) 2008-2019 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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*
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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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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY 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 OF
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* 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 "JSCJSValue.h"
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#include <wtf/Assertions.h>
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#include <wtf/VectorTraits.h>
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namespace JSC {
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class CallFrame;
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class CodeBlock;
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class JSLexicalEnvironment;
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class JSObject;
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class JSScope;
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class Register {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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Register();
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Register(const JSValue&);
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JSValue jsValue() const;
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JSValue asanUnsafeJSValue() const;
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EncodedJSValue encodedJSValue() const;
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ALWAYS_INLINE Register& operator=(CallFrame*);
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ALWAYS_INLINE Register& operator=(CodeBlock*);
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ALWAYS_INLINE Register& operator=(JSScope*);
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ALWAYS_INLINE Register& operator=(JSCell*);
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ALWAYS_INLINE Register& operator=(EncodedJSValue);
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int32_t i() const;
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ALWAYS_INLINE CallFrame* callFrame() const;
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ALWAYS_INLINE CodeBlock* codeBlock() const;
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ALWAYS_INLINE CodeBlock* asanUnsafeCodeBlock() const;
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ALWAYS_INLINE JSObject* object() const;
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ALWAYS_INLINE JSScope* scope() const;
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int32_t unboxedInt32() const;
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uint32_t unboxedUInt32() const;
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int32_t asanUnsafeUnboxedInt32() const;
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int64_t unboxedInt52() const;
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int64_t asanUnsafeUnboxedInt52() const;
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int64_t unboxedStrictInt52() const;
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int64_t asanUnsafeUnboxedStrictInt52() const;
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int64_t unboxedInt64() const;
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int64_t asanUnsafeUnboxedInt64() const;
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bool unboxedBoolean() const;
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double unboxedDouble() const;
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double asanUnsafeUnboxedDouble() const;
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JSCell* unboxedCell() const;
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JSCell* asanUnsafeUnboxedCell() const;
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int32_t payload() const;
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int32_t tag() const;
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int32_t unsafePayload() const;
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int32_t unsafeTag() const;
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int32_t& payload();
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int32_t& tag();
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void* pointer() const;
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void* asanUnsafePointer() const;
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static Register withInt(int32_t i)
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{
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Register r = jsNumber(i);
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return r;
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}
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private:
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union {
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EncodedJSValue value;
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CallFrame* callFrame;
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CodeBlock* codeBlock;
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EncodedValueDescriptor encodedValue;
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double number;
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int64_t integer;
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} u;
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};
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ALWAYS_INLINE Register::Register()
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{
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#ifndef NDEBUG
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*this = JSValue();
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#endif
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}
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ALWAYS_INLINE Register::Register(const JSValue& v)
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{
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u.value = JSValue::encode(v);
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}
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// FIXME (rdar://problem/19379214): ASan only needs to be suppressed for Register::jsValue() when called from prepareOSREntry(), but there is currently no way to express this short of adding a separate copy of the function.
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SUPPRESS_ASAN ALWAYS_INLINE JSValue Register::asanUnsafeJSValue() const
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{
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return JSValue::decode(u.value);
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}
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ALWAYS_INLINE JSValue Register::jsValue() const
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{
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return JSValue::decode(u.value);
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}
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ALWAYS_INLINE EncodedJSValue Register::encodedJSValue() const
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{
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return u.value;
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}
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// Interpreter functions
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ALWAYS_INLINE int32_t Register::i() const
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{
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return jsValue().asInt32();
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}
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ALWAYS_INLINE int32_t Register::unboxedInt32() const
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{
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return payload();
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}
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ALWAYS_INLINE uint32_t Register::unboxedUInt32() const
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{
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return static_cast<uint32_t>(unboxedInt32());
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}
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SUPPRESS_ASAN ALWAYS_INLINE int32_t Register::asanUnsafeUnboxedInt32() const
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{
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return unsafePayload();
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}
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ALWAYS_INLINE int64_t Register::unboxedInt52() const
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{
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return u.integer >> JSValue::int52ShiftAmount;
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}
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SUPPRESS_ASAN ALWAYS_INLINE int64_t Register::asanUnsafeUnboxedInt52() const
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{
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return u.integer >> JSValue::int52ShiftAmount;
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}
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ALWAYS_INLINE int64_t Register::unboxedStrictInt52() const
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{
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return u.integer;
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}
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SUPPRESS_ASAN ALWAYS_INLINE int64_t Register::asanUnsafeUnboxedStrictInt52() const
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{
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return u.integer;
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}
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ALWAYS_INLINE int64_t Register::unboxedInt64() const
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{
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return u.integer;
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}
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SUPPRESS_ASAN ALWAYS_INLINE int64_t Register::asanUnsafeUnboxedInt64() const
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{
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return u.integer;
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}
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ALWAYS_INLINE bool Register::unboxedBoolean() const
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{
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return !!payload();
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}
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ALWAYS_INLINE double Register::unboxedDouble() const
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{
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return u.number;
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}
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SUPPRESS_ASAN ALWAYS_INLINE double Register::asanUnsafeUnboxedDouble() const
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{
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return u.number;
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}
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ALWAYS_INLINE JSCell* Register::unboxedCell() const
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{
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#if USE(JSVALUE64)
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return u.encodedValue.ptr;
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#else
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return bitwise_cast<JSCell*>(payload());
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#endif
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}
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SUPPRESS_ASAN ALWAYS_INLINE JSCell* Register::asanUnsafeUnboxedCell() const
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{
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#if USE(JSVALUE64)
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return u.encodedValue.ptr;
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#else
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return bitwise_cast<JSCell*>(payload());
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#endif
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}
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ALWAYS_INLINE void* Register::pointer() const
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{
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#if USE(JSVALUE64)
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return u.encodedValue.ptr;
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#else
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return bitwise_cast<void*>(payload());
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#endif
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}
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SUPPRESS_ASAN ALWAYS_INLINE void* Register::asanUnsafePointer() const
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{
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#if USE(JSVALUE64)
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return u.encodedValue.ptr;
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#else
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return bitwise_cast<void*>(unsafePayload());
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#endif
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}
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ALWAYS_INLINE int32_t Register::payload() const
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{
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return u.encodedValue.asBits.payload;
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}
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ALWAYS_INLINE int32_t Register::tag() const
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{
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return u.encodedValue.asBits.tag;
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}
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SUPPRESS_ASAN ALWAYS_INLINE int32_t Register::unsafePayload() const
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{
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return u.encodedValue.asBits.payload;
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}
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SUPPRESS_ASAN ALWAYS_INLINE int32_t Register::unsafeTag() const
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{
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return u.encodedValue.asBits.tag;
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}
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ALWAYS_INLINE int32_t& Register::payload()
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{
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return u.encodedValue.asBits.payload;
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}
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ALWAYS_INLINE int32_t& Register::tag()
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{
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return u.encodedValue.asBits.tag;
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}
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} // namespace JSC
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namespace WTF {
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template<> struct VectorTraits<JSC::Register> : VectorTraitsBase<true, JSC::Register> { };
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} // namespace WTF
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