parser/SyntaxChecker.h

   1 /*
   2  * Copyright (C) 2010, 2013 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  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef SyntaxChecker_h
  27 #define SyntaxChecker_h
  28
  29 #include "Lexer.h"
  30 #include <yarr/YarrSyntaxChecker.h>
  31
  32 namespace JSC {
  33
  34 class SyntaxChecker {
  35 public:
  36     struct BinaryExprContext {
  37         BinaryExprContext(SyntaxChecker& context)
  38             : m_context(&context)
  39         {
  40             m_context->m_topBinaryExprs.append(m_context->m_topBinaryExpr);
  41             m_context->m_topBinaryExpr = 0;
  42         }
  43         ~BinaryExprContext()
  44         {
  45             m_context->m_topBinaryExpr = m_context->m_topBinaryExprs.last();
  46             m_context->m_topBinaryExprs.removeLast();
  47         }
  48     private:
  49         SyntaxChecker* m_context;
  50     };
  51     struct UnaryExprContext {
  52         UnaryExprContext(SyntaxChecker& context)
  53             : m_context(&context)
  54         {
  55             m_context->m_topUnaryTokens.append(m_context->m_topUnaryToken);
  56             m_context->m_topUnaryToken = 0;
  57         }
  58         ~UnaryExprContext()
  59         {
  60             m_context->m_topUnaryToken = m_context->m_topUnaryTokens.last();
  61             m_context->m_topUnaryTokens.removeLast();
  62         }
  63     private:
  64         SyntaxChecker* m_context;
  65     };
  66
  67     SyntaxChecker(VM* , void*)
  68     {
  69     }
  70
  71     typedef SyntaxChecker FunctionBodyBuilder;
  72     enum { NoneExpr = 0,
  73         ResolveEvalExpr, ResolveExpr, NumberExpr, StringExpr,
  74         ThisExpr, NullExpr, BoolExpr, RegExpExpr, ObjectLiteralExpr,
  75         FunctionExpr, BracketExpr, DotExpr, CallExpr,
  76         NewExpr, PreExpr, PostExpr, UnaryExpr, BinaryExpr,
  77         ConditionalExpr, AssignmentExpr, TypeofExpr,
  78         DeleteExpr, ArrayLiteralExpr };
  79     typedef int ExpressionType;
  80
  81     typedef ExpressionType Expression;
  82     typedef int SourceElements;
  83     typedef int Arguments;
  84     typedef ExpressionType Comma;
  85     struct Property {
  86         ALWAYS_INLINE Property(void* = 0)
  87             : type((PropertyNode::Type)0)
  88         {
  89         }
  90         ALWAYS_INLINE Property(const Identifier* ident, PropertyNode::Type ty)
  91         : name(ident)
  92         , type(ty)
  93         {
  94         }
  95         ALWAYS_INLINE Property(PropertyNode::Type ty)
  96             : name(0)
  97             , type(ty)
  98         {
  99         }
 100         ALWAYS_INLINE bool operator!() { return !type; }
 101         const Identifier* name;
 102         PropertyNode::Type type;
 103     };
 104     typedef int PropertyList;
 105     typedef int ElementList;
 106     typedef int ArgumentsList;
 107     typedef int FormalParameterList;
 108     typedef int FunctionBody;
 109     typedef int Statement;
 110     typedef int ClauseList;
 111     typedef int Clause;
 112     typedef int ConstDeclList;
 113     typedef int BinaryOperand;
 114
 115     static const bool CreatesAST = false;
 116     static const bool NeedsFreeVariableInfo = false;
 117     static const bool CanUseFunctionCache = true;
 118     static const unsigned DontBuildKeywords = LexexFlagsDontBuildKeywords;
 119     static const unsigned DontBuildStrings = LexerFlagsDontBuildStrings;
 120
 121     int createSourceElements() { return 1; }
 122     ExpressionType makeFunctionCallNode(const JSTokenLocation&, int, int, int, int, int, int, int) { return CallExpr; }
 123     void appendToComma(ExpressionType& base, ExpressionType right) { base = right; }
 124     ExpressionType createCommaExpr(const JSTokenLocation&, ExpressionType, ExpressionType right) { return right; }
 125     ExpressionType makeAssignNode(const JSTokenLocation&, ExpressionType, Operator, ExpressionType, bool, bool, int, int, int, int, int) { return AssignmentExpr; }
 126     ExpressionType makePrefixNode(const JSTokenLocation&, ExpressionType, Operator, int, int, int, int, int) { return PreExpr; }
 127     ExpressionType makePostfixNode(const JSTokenLocation&, ExpressionType, Operator, int, int, int, int, int) { return PostExpr; }
 128     ExpressionType makeTypeOfNode(const JSTokenLocation&, ExpressionType) { return TypeofExpr; }
 129     ExpressionType makeDeleteNode(const JSTokenLocation&, ExpressionType, int, int, int, int, int) { return DeleteExpr; }
 130     ExpressionType makeNegateNode(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 131     ExpressionType makeBitwiseNotNode(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 132     ExpressionType createLogicalNot(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 133     ExpressionType createUnaryPlus(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 134     ExpressionType createVoid(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 135     ExpressionType thisExpr(const JSTokenLocation&) { return ThisExpr; }
 136     ExpressionType createResolve(const JSTokenLocation&, const Identifier*, int, int, int) { return ResolveExpr; }
 137     ExpressionType createObjectLiteral(const JSTokenLocation&) { return ObjectLiteralExpr; }
 138     ExpressionType createObjectLiteral(const JSTokenLocation&, int) { return ObjectLiteralExpr; }
 139     ExpressionType createArray(const JSTokenLocation&, int) { return ArrayLiteralExpr; }
 140     ExpressionType createArray(const JSTokenLocation&, int, int) { return ArrayLiteralExpr; }
 141     ExpressionType createNumberExpr(const JSTokenLocation&, double) { return NumberExpr; }
 142     ExpressionType createString(const JSTokenLocation&, const Identifier*) { return StringExpr; }
 143     ExpressionType createBoolean(const JSTokenLocation&, bool) { return BoolExpr; }
 144     ExpressionType createNull(const JSTokenLocation&) { return NullExpr; }
 145     ExpressionType createBracketAccess(const JSTokenLocation&, ExpressionType, ExpressionType, bool, int, int, int, int, int) { return BracketExpr; }
 146     ExpressionType createDotAccess(const JSTokenLocation&, ExpressionType, const Identifier*, int, int, int, int, int) { return DotExpr; }
 147     ExpressionType createRegExp(const JSTokenLocation&, const Identifier& pattern, const Identifier&, int, int, int) { return Yarr::checkSyntax(pattern.string()) ? 0 : RegExpExpr; }
 148     ExpressionType createNewExpr(const JSTokenLocation&, ExpressionType, int, int, int, int, int, int) { return NewExpr; }
 149     ExpressionType createNewExpr(const JSTokenLocation&, ExpressionType, int, int, int, int) { return NewExpr; }
 150     ExpressionType createConditionalExpr(const JSTokenLocation&, ExpressionType, ExpressionType, ExpressionType) { return ConditionalExpr; }
 151     ExpressionType createAssignResolve(const JSTokenLocation&, const Identifier&, ExpressionType, int, int, int, int, int) { return AssignmentExpr; }
 152     ExpressionType createFunctionExpr(const JSTokenLocation&, const Identifier*, int, int, int, int, int, int, int) { return FunctionExpr; }
 153     int createFunctionBody(const JSTokenLocation&, const JSTokenLocation&, int, bool) { return 1; }
 154     void setFunctionStart(int, int) { }
 155     int createArguments() { return 1; }
 156     int createArguments(int) { return 1; }
 157     int createArgumentsList(const JSTokenLocation&, int) { return 1; }
 158     int createArgumentsList(const JSTokenLocation&, int, int) { return 1; }
 159     template <bool complete> Property createProperty(const Identifier* name, int, PropertyNode::Type type)
 160     {
 161         if (!complete)
 162             return Property(type);
 163         ASSERT(name);
 164         return Property(name, type);
 165     }
 166     template <bool complete> Property createProperty(VM* vm, double name, int, PropertyNode::Type type)
 167     {
 168         if (!complete)
 169             return Property(type);
 170         return Property(&vm->parserArena->identifierArena().makeNumericIdentifier(vm, name), type);
 171     }
 172     int createPropertyList(const JSTokenLocation&, Property) { return 1; }
 173     int createPropertyList(const JSTokenLocation&, Property, int) { return 1; }
 174     int createElementList(int, int) { return 1; }
 175     int createElementList(int, int, int) { return 1; }
 176     int createFormalParameterList(const Identifier&) { return 1; }
 177     int createFormalParameterList(int, const Identifier&) { return 1; }
 178     int createClause(int, int) { return 1; }
 179     int createClauseList(int) { return 1; }
 180     int createClauseList(int, int) { return 1; }
 181     void setUsesArguments(int) { }
 182     int createFuncDeclStatement(const JSTokenLocation&, const Identifier*, int, int, int, int, int, int, int) { return 1; }
 183     int createBlockStatement(const JSTokenLocation&, int, int, int) { return 1; }
 184     int createExprStatement(const JSTokenLocation&, int, int, int) { return 1; }
 185     int createIfStatement(const JSTokenLocation&, int, int, int, int) { return 1; }
 186     int createIfStatement(const JSTokenLocation&, int, int, int, int, int) { return 1; }
 187     int createForLoop(const JSTokenLocation&, int, int, int, int, int, int) { return 1; }
 188     int createForInLoop(const JSTokenLocation&, const Identifier*, int, int, int, int, int, int, int, int, int, int, int, int) { return 1; }
 189     int createForInLoop(const JSTokenLocation&, int, int, int, int, int, int, int, int, int, int) { return 1; }
 190     int createEmptyStatement(const JSTokenLocation&) { return 1; }
 191     int createVarStatement(const JSTokenLocation&, int, int, int) { return 1; }
 192     int createReturnStatement(const JSTokenLocation&, int, int, int, int, int, int, int) { return 1; }
 193     int createBreakStatement(const JSTokenLocation&, int, int, int, int, int) { return 1; }
 194     int createBreakStatement(const JSTokenLocation&, const Identifier*, int, int, int, int, int) { return 1; }
 195     int createContinueStatement(const JSTokenLocation&, int, int, int, int, int) { return 1; }
 196     int createContinueStatement(const JSTokenLocation&, const Identifier*, int, int, int, int, int) { return 1; }
 197     int createTryStatement(const JSTokenLocation&, int, const Identifier*, int, int, int, int) { return 1; }
 198     int createSwitchStatement(const JSTokenLocation&, int, int, int, int, int, int) { return 1; }
 199     int createWhileStatement(const JSTokenLocation&, int, int, int, int) { return 1; }
 200     int createWithStatement(const JSTokenLocation&, int, int, int, int, int, int, int, int) { return 1; }
 201     int createDoWhileStatement(const JSTokenLocation&, int, int, int, int) { return 1; }
 202     int createLabelStatement(const JSTokenLocation&, const Identifier*, int, int, int, int, int) { return 1; }
 203     int createThrowStatement(const JSTokenLocation&, int, int, int, int, int, int, int) { return 1; }
 204     int createDebugger(const JSTokenLocation&, int, int) { return 1; }
 205     int createConstStatement(const JSTokenLocation&, int, int, int) { return 1; }
 206     int appendConstDecl(const JSTokenLocation&, int, const Identifier*, int) { return 1; }
 207     template <bool strict> Property createGetterOrSetterProperty(const JSTokenLocation&, PropertyNode::Type type, const Identifier* name, int, int, int, int, int, int, int)
 208     {
 209         ASSERT(name);
 210         if (!strict)
 211             return Property(type);
 212         return Property(name, type);
 213     }
 214     template <bool strict> Property createGetterOrSetterProperty(VM* vm, const JSTokenLocation&, PropertyNode::Type type, double name, int, int, int, int, int, int, int)
 215     {
 216         if (!strict)
 217             return Property(type);
 218         return Property(&vm->parserArena->identifierArena().makeNumericIdentifier(vm, name), type);
 219     }
 220
 221     void appendStatement(int, int) { }
 222     void addVar(const Identifier*, bool) { }
 223     int combineCommaNodes(const JSTokenLocation&, int, int) { return 1; }
 224     int evalCount() const { return 0; }
 225     void appendBinaryExpressionInfo(int& operandStackDepth, int expr, int, int, int, int, int, bool)
 226     {
 227         if (!m_topBinaryExpr)
 228             m_topBinaryExpr = expr;
 229         else
 230             m_topBinaryExpr = BinaryExpr;
 231         operandStackDepth++;
 232     }
 233
 234     // Logic to handle datastructures used during parsing of binary expressions
 235     void operatorStackPop(int& operatorStackDepth) { operatorStackDepth--; }
 236     bool operatorStackHasHigherPrecedence(int&, int) { return true; }
 237     BinaryOperand getFromOperandStack(int) { return m_topBinaryExpr; }
 238     void shrinkOperandStackBy(int& operandStackDepth, int amount) { operandStackDepth -= amount; }
 239     void appendBinaryOperation(const JSTokenLocation&, int& operandStackDepth, int&, BinaryOperand, BinaryOperand) { operandStackDepth++; }
 240     void operatorStackAppend(int& operatorStackDepth, int, int) { operatorStackDepth++; }
 241     int popOperandStack(int&) { int res = m_topBinaryExpr; m_topBinaryExpr = 0; return res; }
 242
 243     void appendUnaryToken(int& stackDepth, int tok, int, int, int) { stackDepth = 1; m_topUnaryToken = tok; }
 244     int unaryTokenStackLastType(int&) { return m_topUnaryToken; }
 245     unsigned unaryTokenStackLastStart(int&) { return 0; }
 246     unsigned unaryTokenStackLastLineStartPosition(int&) { return 0; }
 247     void unaryTokenStackRemoveLast(int& stackDepth) { stackDepth = 0; }
 248
 249     void assignmentStackAppend(int, int, int, int, int, int, int, Operator) { }
 250     int createAssignment(const JSTokenLocation&, int, int, int, int, int) { RELEASE_ASSERT_NOT_REACHED(); return 1; }
 251     const Identifier& getName(const Property& property) const { ASSERT(property.name); return *property.name; }
 252     PropertyNode::Type getType(const Property& property) const { return property.type; }
 253     bool isResolve(ExpressionType expr) const { return expr == ResolveExpr || expr == ResolveEvalExpr; }
 254
 255 private:
 256     int m_topBinaryExpr;
 257     int m_topUnaryToken;
 258     Vector<int, 8> m_topBinaryExprs;
 259     Vector<int, 8> m_topUnaryTokens;
 260 };
 261
 262 }
 263
 264 #endif