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      1 /*
      2  * Copyright (C) 2008, 2009 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  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef Register_h
     30 #define Register_h
     31 
     32 #include "JSValue.h"
     33 #include <wtf/Assertions.h>
     34 #include <wtf/VectorTraits.h>
     35 
     36 namespace JSC {
     37 
     38     class CodeBlock;
     39     class ExecState;
     40     class JSActivation;
     41     class JSObject;
     42     class JSPropertyNameIterator;
     43     class ScopeChainNode;
     44 
     45     struct Instruction;
     46 
     47     typedef ExecState CallFrame;
     48 
     49     class Register {
     50         WTF_MAKE_FAST_ALLOCATED;
     51     public:
     52         Register();
     53 
     54         Register(const JSValue&);
     55         Register& operator=(const JSValue&);
     56         JSValue jsValue() const;
     57         EncodedJSValue encodedJSValue() const;
     58 
     59         Register& operator=(CallFrame*);
     60         Register& operator=(CodeBlock*);
     61         Register& operator=(ScopeChainNode*);
     62         Register& operator=(Instruction*);
     63 
     64         int32_t i() const;
     65         JSActivation* activation() const;
     66         CallFrame* callFrame() const;
     67         CodeBlock* codeBlock() const;
     68         JSObject* function() const;
     69         JSPropertyNameIterator* propertyNameIterator() const;
     70         ScopeChainNode* scopeChain() const;
     71         Instruction* vPC() const;
     72 
     73         static Register withInt(int32_t i)
     74         {
     75             Register r = jsNumber(i);
     76             return r;
     77         }
     78 
     79         static inline Register withCallee(JSObject* callee);
     80 
     81     private:
     82         union {
     83             EncodedJSValue value;
     84             CallFrame* callFrame;
     85             CodeBlock* codeBlock;
     86             Instruction* vPC;
     87         } u;
     88     };
     89 
     90     ALWAYS_INLINE Register::Register()
     91     {
     92 #ifndef NDEBUG
     93         *this = JSValue();
     94 #endif
     95     }
     96 
     97     ALWAYS_INLINE Register::Register(const JSValue& v)
     98     {
     99 #if ENABLE(JSC_ZOMBIES)
    100         ASSERT(!v.isZombie());
    101 #endif
    102         u.value = JSValue::encode(v);
    103     }
    104 
    105     ALWAYS_INLINE Register& Register::operator=(const JSValue& v)
    106     {
    107 #if ENABLE(JSC_ZOMBIES)
    108         ASSERT(!v.isZombie());
    109 #endif
    110         u.value = JSValue::encode(v);
    111         return *this;
    112     }
    113 
    114     ALWAYS_INLINE JSValue Register::jsValue() const
    115     {
    116         return JSValue::decode(u.value);
    117     }
    118 
    119     ALWAYS_INLINE EncodedJSValue Register::encodedJSValue() const
    120     {
    121         return u.value;
    122     }
    123 
    124     // Interpreter functions
    125 
    126     ALWAYS_INLINE Register& Register::operator=(CallFrame* callFrame)
    127     {
    128         u.callFrame = callFrame;
    129         return *this;
    130     }
    131 
    132     ALWAYS_INLINE Register& Register::operator=(CodeBlock* codeBlock)
    133     {
    134         u.codeBlock = codeBlock;
    135         return *this;
    136     }
    137 
    138     ALWAYS_INLINE Register& Register::operator=(Instruction* vPC)
    139     {
    140         u.vPC = vPC;
    141         return *this;
    142     }
    143 
    144     ALWAYS_INLINE int32_t Register::i() const
    145     {
    146         return jsValue().asInt32();
    147     }
    148 
    149     ALWAYS_INLINE CallFrame* Register::callFrame() const
    150     {
    151         return u.callFrame;
    152     }
    153 
    154     ALWAYS_INLINE CodeBlock* Register::codeBlock() const
    155     {
    156         return u.codeBlock;
    157     }
    158 
    159     ALWAYS_INLINE Instruction* Register::vPC() const
    160     {
    161         return u.vPC;
    162     }
    163 
    164 } // namespace JSC
    165 
    166 namespace WTF {
    167 
    168     template<> struct VectorTraits<JSC::Register> : VectorTraitsBase<true, JSC::Register> { };
    169 
    170 } // namespace WTF
    171 
    172 #endif // Register_h
    173