2 * Copyright (C) 2008 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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
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37 #include "RegisterFile.h"
39 #include <wtf/HashMap.h>
45 class FunctionExecutable;
48 class ProgramExecutable;
52 struct CallFrameClosure;
65 class TopCallFrameSetter {
67 TopCallFrameSetter(JSGlobalData& global, CallFrame* callFrame)
69 , oldCallFrame(global.topCallFrame)
71 global.topCallFrame = callFrame;
76 globalData.topCallFrame = oldCallFrame;
79 JSGlobalData& globalData;
80 CallFrame* oldCallFrame;
84 // We use a smaller reentrancy limit on iPhone because of the high amount of
85 // stack space required on the web thread.
86 enum { MaxLargeThreadReentryDepth = 93, MaxSmallThreadReentryDepth = 32 };
88 enum { MaxLargeThreadReentryDepth = 256, MaxSmallThreadReentryDepth = 32 };
89 #endif // PLATFORM(IOS)
92 WTF_MAKE_FAST_ALLOCATED;
94 friend class CachedCall;
98 RegisterFile& registerFile() { return m_registerFile; }
100 Opcode getOpcode(OpcodeID id)
102 #if ENABLE(COMPUTED_GOTO_INTERPRETER)
103 return m_opcodeTable[id];
109 OpcodeID getOpcodeID(Opcode opcode)
111 #if ENABLE(COMPUTED_GOTO_INTERPRETER)
112 ASSERT(isOpcode(opcode));
113 return m_opcodeIDTable.get(opcode);
119 bool isOpcode(Opcode);
121 JSValue execute(ProgramExecutable*, CallFrame*, ScopeChainNode*, JSObject* thisObj);
122 JSValue executeCall(CallFrame*, JSObject* function, CallType, const CallData&, JSValue thisValue, const ArgList&);
123 JSObject* executeConstruct(CallFrame*, JSObject* function, ConstructType, const ConstructData&, const ArgList&);
124 JSValue execute(EvalExecutable*, CallFrame*, JSValue thisValue, ScopeChainNode*);
125 JSValue execute(EvalExecutable*, CallFrame*, JSValue thisValue, ScopeChainNode*, int globalRegisterOffset);
127 JSValue retrieveArguments(CallFrame*, JSFunction*) const;
128 JS_EXPORT_PRIVATE JSValue retrieveCaller(CallFrame*, JSFunction*) const;
129 JS_EXPORT_PRIVATE void retrieveLastCaller(CallFrame*, int& lineNumber, intptr_t& sourceID, UString& sourceURL, JSValue& function) const;
131 void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);
133 SamplingTool* sampler() { return m_sampler.get(); }
135 NEVER_INLINE HandlerInfo* throwException(CallFrame*&, JSValue&, unsigned bytecodeOffset);
136 NEVER_INLINE void debug(CallFrame*, DebugHookID, int firstLine, int lastLine);
138 void dumpSampleData(ExecState* exec);
139 void startSampling();
142 enum ExecutionFlag { Normal, InitializeAndReturn };
144 CallFrameClosure prepareForRepeatCall(FunctionExecutable*, CallFrame*, JSFunction*, int argumentCountIncludingThis, ScopeChainNode*);
145 void endRepeatCall(CallFrameClosure&);
146 JSValue execute(CallFrameClosure&);
148 #if ENABLE(INTERPRETER)
149 NEVER_INLINE bool resolve(CallFrame*, Instruction*, JSValue& exceptionValue);
150 NEVER_INLINE bool resolveSkip(CallFrame*, Instruction*, JSValue& exceptionValue);
151 NEVER_INLINE bool resolveGlobal(CallFrame*, Instruction*, JSValue& exceptionValue);
152 NEVER_INLINE bool resolveGlobalDynamic(CallFrame*, Instruction*, JSValue& exceptionValue);
153 NEVER_INLINE void resolveBase(CallFrame*, Instruction* vPC);
154 NEVER_INLINE bool resolveBaseAndProperty(CallFrame*, Instruction*, JSValue& exceptionValue);
155 NEVER_INLINE bool resolveThisAndProperty(CallFrame*, Instruction*, JSValue& exceptionValue);
156 NEVER_INLINE ScopeChainNode* createExceptionScope(CallFrame*, const Instruction* vPC);
158 void tryCacheGetByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const Identifier& propertyName, const PropertySlot&);
159 void uncacheGetByID(CodeBlock*, Instruction* vPC);
160 void tryCachePutByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const PutPropertySlot&);
161 void uncachePutByID(CodeBlock*, Instruction* vPC);
162 #endif // ENABLE(INTERPRETER)
164 NEVER_INLINE bool unwindCallFrame(CallFrame*&, JSValue, unsigned& bytecodeOffset, CodeBlock*&);
166 static ALWAYS_INLINE CallFrame* slideRegisterWindowForCall(CodeBlock*, RegisterFile*, CallFrame*, size_t registerOffset, int argc);
168 static CallFrame* findFunctionCallFrame(CallFrame*, JSFunction*);
170 JSValue privateExecute(ExecutionFlag, RegisterFile*, CallFrame*);
172 void dumpCallFrame(CallFrame*);
173 void dumpRegisters(CallFrame*);
175 bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(op_call) || opcode == getOpcode(op_construct) || opcode == getOpcode(op_call_eval); }
177 void enableSampler();
178 int m_sampleEntryDepth;
179 OwnPtr<SamplingTool> m_sampler;
183 RegisterFile m_registerFile;
185 #if ENABLE(COMPUTED_GOTO_INTERPRETER)
186 Opcode m_opcodeTable[numOpcodeIDs]; // Maps OpcodeID => Opcode for compiling
187 HashMap<Opcode, OpcodeID> m_opcodeIDTable; // Maps Opcode => OpcodeID for decompiling
191 // This value must not be an object that would require this conversion (WebCore's global object).
192 inline bool isValidThisObject(JSValue thisValue, ExecState* exec)
194 return !thisValue.isObject() || thisValue.toThisObject(exec) == thisValue;
197 inline JSValue Interpreter::execute(EvalExecutable* eval, CallFrame* callFrame, JSValue thisValue, ScopeChainNode* scopeChain)
199 return execute(eval, callFrame, thisValue, scopeChain, m_registerFile.size() + 1 + RegisterFile::CallFrameHeaderSize);
202 JSValue eval(CallFrame*);
203 CallFrame* loadVarargs(CallFrame*, RegisterFile*, JSValue thisValue, JSValue arguments, int firstFreeRegister);
207 #endif // Interpreter_h