| 1 | /*
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| 2 | * Copyright (C) 2008 Apple Inc. All rights reserved.
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| 3 | * Copyright (C) 2008 Cameron Zwarich <[email protected]>
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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| 15 | * its contributors may be used to endorse or promote products derived
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| 16 | * from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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| 19 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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| 20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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| 21 | * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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| 22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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| 23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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| 24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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| 25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | #ifndef CodeBlock_h
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| 31 | #define CodeBlock_h
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| 32 |
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| 33 | #include "Instruction.h"
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| 34 | #include "JSGlobalObject.h"
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| 35 | #include "nodes.h"
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| 36 | #include "ustring.h"
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| 37 | #include <wtf/RefPtr.h>
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| 38 | #include <wtf/Vector.h>
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| 39 |
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| 40 | namespace KJS {
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| 41 |
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| 42 | class ExecState;
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| 43 |
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| 44 | static ALWAYS_INLINE int missingThisObjectMarker() { return std::numeric_limits<int>::max(); }
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| 45 |
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| 46 | struct HandlerInfo {
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| 47 | unsigned start;
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| 48 | unsigned end;
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| 49 | unsigned target;
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| 50 | unsigned scopeDepth;
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| 51 | };
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| 52 |
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| 53 | struct LineInfo {
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| 54 | unsigned instructionOffset;
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| 55 | int lineNumber;
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| 56 | };
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| 57 |
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| 58 | struct CodeBlock {
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| 59 | CodeBlock(ScopeNode* ownerNode_, CodeType codeType_)
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| 60 | : ownerNode(ownerNode_)
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| 61 | , numTemporaries(0)
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| 62 | , numVars(0)
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| 63 | , numParameters(0)
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| 64 | , numLocals(0)
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| 65 | , needsFullScopeChain(ownerNode_->usesEval() || ownerNode_->needsClosure())
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| 66 | , usesEval(ownerNode_->usesEval())
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| 67 | , codeType(codeType_)
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| 68 | {
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| 69 | }
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| 70 |
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| 71 | void dump(ExecState*) const;
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| 72 | int lineNumberForVPC(const Instruction*);
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| 73 | bool getHandlerForVPC(const Instruction* vPC, Instruction*& target, int& scopeDepth);
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| 74 | void mark();
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| 75 |
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| 76 | ScopeNode* ownerNode;
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| 77 |
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| 78 | int numTemporaries;
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| 79 | int numVars;
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| 80 | int numParameters;
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| 81 | int numLocals;
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| 82 | int thisRegister;
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| 83 | bool needsFullScopeChain;
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| 84 | bool usesEval;
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| 85 | CodeType codeType;
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| 86 |
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| 87 | Vector<Instruction> instructions;
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| 88 |
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| 89 | // Constant pool
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| 90 | Vector<Identifier> identifiers;
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| 91 | Vector<RefPtr<FuncDeclNode> > functions;
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| 92 | Vector<RefPtr<FuncExprNode> > functionExpressions;
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| 93 | Vector<JSValue*> jsValues;
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| 94 | Vector<RefPtr<RegExp> > regexps;
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| 95 | Vector<HandlerInfo> exceptionHandlers;
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| 96 | Vector<LineInfo> lineInfo;
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| 97 |
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| 98 | private:
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| 99 | void dump(ExecState*, const Vector<Instruction>::const_iterator& begin, Vector<Instruction>::const_iterator&) const;
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| 100 | };
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| 101 |
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| 102 | // Program code is not marked by any function, so we make the global object
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| 103 | // responsible for marking it.
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| 104 |
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| 105 | struct ProgramCodeBlock : public CodeBlock {
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| 106 | ProgramCodeBlock(ScopeNode* ownerNode_, CodeType codeType_, JSGlobalObject* globalObject_)
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| 107 | : CodeBlock(ownerNode_, codeType_)
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| 108 | , globalObject(globalObject_)
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| 109 | {
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| 110 | globalObject->codeBlocks().add(this);
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| 111 | }
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| 112 |
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| 113 | ~ProgramCodeBlock()
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| 114 | {
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| 115 | if (globalObject)
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| 116 | globalObject->codeBlocks().remove(this);
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| 117 | }
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| 118 |
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| 119 | JSGlobalObject* globalObject; // For program and eval nodes, the global object that marks the constant pool.
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| 120 | };
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| 121 |
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| 122 | struct EvalCodeBlock : public ProgramCodeBlock {
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| 123 | EvalCodeBlock(ScopeNode* ownerNode_, JSGlobalObject* globalObject_)
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| 124 | : ProgramCodeBlock(ownerNode_, EvalCode, globalObject_)
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| 125 | {
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| 126 | }
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| 127 | };
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| 128 |
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| 129 | } // namespace KJS
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| 130 |
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| 131 | #endif // CodeBlock_h
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