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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 
withInt(int32_t i)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 
Register()90     ALWAYS_INLINE Register::Register()
91     {
92 #ifndef NDEBUG
93         *this = JSValue();
94 #endif
95     }
96 
Register(const JSValue & v)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 
jsValue()114     ALWAYS_INLINE JSValue Register::jsValue() const
115     {
116         return JSValue::decode(u.value);
117     }
118 
encodedJSValue()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 
i()144     ALWAYS_INLINE int32_t Register::i() const
145     {
146         return jsValue().asInt32();
147     }
148 
callFrame()149     ALWAYS_INLINE CallFrame* Register::callFrame() const
150     {
151         return u.callFrame;
152     }
153 
codeBlock()154     ALWAYS_INLINE CodeBlock* Register::codeBlock() const
155     {
156         return u.codeBlock;
157     }
158 
vPC()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