1/*
2 * Copyright (C) 2008 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 Interpreter_h
30#define Interpreter_h
31
32#include "ArgList.h"
33#include "FastAllocBase.h"
34#include "JSCell.h"
35#include "JSValue.h"
36#include "JSObject.h"
37#include "Opcode.h"
38#include "RegisterFile.h"
39
40#include <wtf/HashMap.h>
41
42namespace JSC {
43
44 class CodeBlock;
45 class EvalExecutable;
46 class FunctionExecutable;
47 class InternalFunction;
48 class JSFunction;
49 class JSGlobalObject;
50 class ProgramExecutable;
51 class Register;
52 class ScopeChainNode;
53 class SamplingTool;
54 struct CallFrameClosure;
55 struct HandlerInfo;
56 struct Instruction;
57
58 enum DebugHookID {
59 WillExecuteProgram,
60 DidExecuteProgram,
61 DidEnterCallFrame,
62 DidReachBreakpoint,
63 WillLeaveCallFrame,
64 WillExecuteStatement
65 };
66
67 enum { MaxMainThreadReentryDepth = 256, MaxSecondaryThreadReentryDepth = 32 };
68
69 class Interpreter : public FastAllocBase {
70 friend class JIT;
71 friend class CachedCall;
72 public:
73 Interpreter();
74
75 RegisterFile& registerFile() { return m_registerFile; }
76
77 Opcode getOpcode(OpcodeID id)
78 {
79 #if HAVE(COMPUTED_GOTO)
80 return m_opcodeTable[id];
81 #else
82 return id;
83 #endif
84 }
85
86 OpcodeID getOpcodeID(Opcode opcode)
87 {
88 #if HAVE(COMPUTED_GOTO)
89 ASSERT(isOpcode(opcode));
90 return m_opcodeIDTable.get(opcode);
91 #else
92 return opcode;
93 #endif
94 }
95
96 bool isOpcode(Opcode);
97
98 JSValue execute(ProgramExecutable*, CallFrame*, ScopeChainNode*, JSObject* thisObj, JSValue* exception);
99 JSValue execute(FunctionExecutable*, CallFrame*, JSFunction*, JSObject* thisObj, const ArgList& args, ScopeChainNode*, JSValue* exception);
100 JSValue execute(EvalExecutable* evalNode, CallFrame* exec, JSObject* thisObj, ScopeChainNode* scopeChain, JSValue* exception);
101
102 JSValue retrieveArguments(CallFrame*, JSFunction*) const;
103 JSValue retrieveCaller(CallFrame*, InternalFunction*) const;
104 void retrieveLastCaller(CallFrame*, int& lineNumber, intptr_t& sourceID, UString& sourceURL, JSValue& function) const;
105
106 void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);
107
108 SamplingTool* sampler() { return m_sampler.get(); }
109
110 NEVER_INLINE JSValue callEval(CallFrame*, RegisterFile*, Register* argv, int argc, int registerOffset, JSValue& exceptionValue);
111 NEVER_INLINE HandlerInfo* throwException(CallFrame*&, JSValue&, unsigned bytecodeOffset, bool);
112 NEVER_INLINE void debug(CallFrame*, DebugHookID, int firstLine, int lastLine);
113
114 void dumpSampleData(ExecState* exec);
115 void startSampling();
116 void stopSampling();
117 private:
118 enum ExecutionFlag { Normal, InitializeAndReturn };
119
120 CallFrameClosure prepareForRepeatCall(FunctionExecutable*, CallFrame*, JSFunction*, int argCount, ScopeChainNode*, JSValue* exception);
121 void endRepeatCall(CallFrameClosure&);
122 JSValue execute(CallFrameClosure&, JSValue* exception);
123
124 JSValue execute(EvalExecutable*, CallFrame*, JSObject* thisObject, int globalRegisterOffset, ScopeChainNode*, JSValue* exception);
125
126#if USE(INTERPRETER)
127 NEVER_INLINE bool resolve(CallFrame*, Instruction*, JSValue& exceptionValue);
128 NEVER_INLINE bool resolveSkip(CallFrame*, Instruction*, JSValue& exceptionValue);
129 NEVER_INLINE bool resolveGlobal(CallFrame*, Instruction*, JSValue& exceptionValue);
130 NEVER_INLINE void resolveBase(CallFrame*, Instruction* vPC);
131 NEVER_INLINE bool resolveBaseAndProperty(CallFrame*, Instruction*, JSValue& exceptionValue);
132 NEVER_INLINE ScopeChainNode* createExceptionScope(CallFrame*, const Instruction* vPC);
133
134 void tryCacheGetByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const Identifier& propertyName, const PropertySlot&);
135 void uncacheGetByID(CodeBlock*, Instruction* vPC);
136 void tryCachePutByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const PutPropertySlot&);
137 void uncachePutByID(CodeBlock*, Instruction* vPC);
138#endif
139
140 NEVER_INLINE bool unwindCallFrame(CallFrame*&, JSValue, unsigned& bytecodeOffset, CodeBlock*&);
141
142 static ALWAYS_INLINE CallFrame* slideRegisterWindowForCall(CodeBlock*, RegisterFile*, CallFrame*, size_t registerOffset, int argc);
143
144 static CallFrame* findFunctionCallFrame(CallFrame*, InternalFunction*);
145
146 JSValue privateExecute(ExecutionFlag, RegisterFile*, CallFrame*, JSValue* exception);
147
148 void dumpCallFrame(CallFrame*);
149 void dumpRegisters(CallFrame*);
150
151 bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(id: op_call) || opcode == getOpcode(id: op_construct) || opcode == getOpcode(id: op_call_eval); }
152
153 void enableSampler();
154 int m_sampleEntryDepth;
155 OwnPtr<SamplingTool> m_sampler;
156
157 int m_reentryDepth;
158
159 RegisterFile m_registerFile;
160
161#if HAVE(COMPUTED_GOTO)
162 Opcode m_opcodeTable[numOpcodeIDs]; // Maps OpcodeID => Opcode for compiling
163 HashMap<Opcode, OpcodeID> m_opcodeIDTable; // Maps Opcode => OpcodeID for decompiling
164#endif
165 };
166
167} // namespace JSC
168
169#endif // Interpreter_h
170

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/Interpreter.h