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 "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, BindingDeconstruction,
  79         ArrayDeconstruction, ObjectDeconstruction, SourceElementsResult,
  80         FunctionBodyResult, SpreadExpr, ArgumentsResult,
  81         PropertyListResult, ArgumentsListResult, ElementsListResult,
  82         StatementResult, FormalParameterListResult, ClauseResult,
  83         ClauseListResult, CommaExpr, DeconstructingAssignment
  84     };
  85     typedef int ExpressionType;
  86
  87     typedef ExpressionType Expression;
  88     typedef int SourceElements;
  89     typedef int Arguments;
  90     typedef ExpressionType Comma;
  91     struct Property {
  92         ALWAYS_INLINE Property(void* = 0)
  93             : type((PropertyNode::Type)0)
  94         {
  95         }
  96         ALWAYS_INLINE Property(const Identifier* ident, PropertyNode::Type ty)
  97             : name(ident)
  98             , type(ty)
  99         {
 100         }
 101         ALWAYS_INLINE Property(PropertyNode::Type ty)
 102             : name(0)
 103             , type(ty)
 104         {
 105         }
 106         ALWAYS_INLINE bool operator!() { return !type; }
 107         const Identifier* name;
 108         PropertyNode::Type type;
 109     };
 110     typedef int PropertyList;
 111     typedef int ElementList;
 112     typedef int ArgumentsList;
 113     typedef int FormalParameterList;
 114     typedef int FunctionBody;
 115     typedef int Statement;
 116     typedef int ClauseList;
 117     typedef int Clause;
 118     typedef int ConstDeclList;
 119     typedef int BinaryOperand;
 120     typedef int DeconstructionPattern;
 121     typedef DeconstructionPattern ArrayPattern;
 122     typedef DeconstructionPattern ObjectPattern;
 123
 124     static const bool CreatesAST = false;
 125     static const bool NeedsFreeVariableInfo = false;
 126     static const bool CanUseFunctionCache = true;
 127     static const unsigned DontBuildKeywords = LexexFlagsDontBuildKeywords;
 128     static const unsigned DontBuildStrings = LexerFlagsDontBuildStrings;
 129
 130     int createSourceElements() { return SourceElementsResult; }
 131     ExpressionType makeFunctionCallNode(const JSTokenLocation&, int, int, int, int, int) { return CallExpr; }
 132     void appendToComma(ExpressionType& base, ExpressionType right) { base = right; }
 133     ExpressionType createCommaExpr(const JSTokenLocation&, ExpressionType, ExpressionType right) { return right; }
 134     ExpressionType makeAssignNode(const JSTokenLocation&, ExpressionType, Operator, ExpressionType, bool, bool, int, int, int) { return AssignmentExpr; }
 135     ExpressionType makePrefixNode(const JSTokenLocation&, ExpressionType, Operator, int, int, int) { return PreExpr; }
 136     ExpressionType makePostfixNode(const JSTokenLocation&, ExpressionType, Operator, int, int, int) { return PostExpr; }
 137     ExpressionType makeTypeOfNode(const JSTokenLocation&, ExpressionType) { return TypeofExpr; }
 138     ExpressionType makeDeleteNode(const JSTokenLocation&, ExpressionType, int, int, int) { return DeleteExpr; }
 139     ExpressionType makeNegateNode(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 140     ExpressionType makeBitwiseNotNode(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 141     ExpressionType createLogicalNot(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 142     ExpressionType createUnaryPlus(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 143     ExpressionType createVoid(const JSTokenLocation&, ExpressionType) { return UnaryExpr; }
 144     ExpressionType thisExpr(const JSTokenLocation&) { return ThisExpr; }
 145     ExpressionType createResolve(const JSTokenLocation&, const Identifier*, int) { return ResolveExpr; }
 146     ExpressionType createObjectLiteral(const JSTokenLocation&) { return ObjectLiteralExpr; }
 147     ExpressionType createObjectLiteral(const JSTokenLocation&, int) { return ObjectLiteralExpr; }
 148     ExpressionType createArray(const JSTokenLocation&, int) { return ArrayLiteralExpr; }
 149     ExpressionType createArray(const JSTokenLocation&, int, int) { return ArrayLiteralExpr; }
 150     ExpressionType createNumberExpr(const JSTokenLocation&, double) { return NumberExpr; }
 151     ExpressionType createString(const JSTokenLocation&, const Identifier*) { return StringExpr; }
 152     ExpressionType createBoolean(const JSTokenLocation&, bool) { return BoolExpr; }
 153     ExpressionType createNull(const JSTokenLocation&) { return NullExpr; }
 154     ExpressionType createBracketAccess(const JSTokenLocation&, ExpressionType, ExpressionType, bool, int, int, int) { return BracketExpr; }
 155     ExpressionType createDotAccess(const JSTokenLocation&, ExpressionType, const Identifier*, int, int, int) { return DotExpr; }
 156     ExpressionType createRegExp(const JSTokenLocation&, const Identifier& pattern, const Identifier&, int) { return Yarr::checkSyntax(pattern.string()) ? 0 : RegExpExpr; }
 157     ExpressionType createNewExpr(const JSTokenLocation&, ExpressionType, int, int, int, int) { return NewExpr; }
 158     ExpressionType createNewExpr(const JSTokenLocation&, ExpressionType, int, int) { return NewExpr; }
 159     ExpressionType createConditionalExpr(const JSTokenLocation&, ExpressionType, ExpressionType, ExpressionType) { return ConditionalExpr; }
 160     ExpressionType createAssignResolve(const JSTokenLocation&, const Identifier&, ExpressionType, int, int, int) { return AssignmentExpr; }
 161     ExpressionType createFunctionExpr(const JSTokenLocation&, const Identifier*, int, int, int, int, int, int, int) { return FunctionExpr; }
 162     int createFunctionBody(const JSTokenLocation&, const JSTokenLocation&, int, int, bool) { return FunctionBodyResult; }
 163     void setFunctionNameStart(int, int) { }
 164     int createArguments() { return ArgumentsResult; }
 165     int createArguments(int) { return ArgumentsResult; }
 166     ExpressionType createSpreadExpression(const JSTokenLocation&, ExpressionType, int, int, int) { return SpreadExpr; }
 167     int createArgumentsList(const JSTokenLocation&, int) { return ArgumentsListResult; }
 168     int createArgumentsList(const JSTokenLocation&, int, int) { return ArgumentsListResult; }
 169     Property createProperty(const Identifier* name, int, PropertyNode::Type type, bool complete)
 170     {
 171         if (!complete)
 172             return Property(type);
 173         ASSERT(name);
 174         return Property(name, type);
 175     }
 176     Property createProperty(VM* vm, double name, int, PropertyNode::Type type, bool complete)
 177     {
 178         if (!complete)
 179             return Property(type);
 180         return Property(&vm->parserArena->identifierArena().makeNumericIdentifier(vm, name), type);
 181     }
 182     Property createProperty(VM*, ExpressionNode*, int, PropertyNode::Type type, bool)
 183     {
 184         return Property(type);
 185     }
 186     int createPropertyList(const JSTokenLocation&, Property) { return PropertyListResult; }
 187     int createPropertyList(const JSTokenLocation&, Property, int) { return PropertyListResult; }
 188     int createElementList(int, int) { return ElementsListResult; }
 189     int createElementList(int, int, int) { return ElementsListResult; }
 190     int createFormalParameterList(DeconstructionPattern) { return FormalParameterListResult; }
 191     int createFormalParameterList(int, DeconstructionPattern) { return FormalParameterListResult; }
 192     int createClause(int, int) { return ClauseResult; }
 193     int createClauseList(int) { return ClauseListResult; }
 194     int createClauseList(int, int) { return ClauseListResult; }
 195     void setUsesArguments(int) { }
 196     int createFuncDeclStatement(const JSTokenLocation&, const Identifier*, int, int, int, int, int, int, int) { return StatementResult; }
 197     int createBlockStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
 198     int createExprStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
 199     int createIfStatement(const JSTokenLocation&, int, int, int, int) { return StatementResult; }
 200     int createIfStatement(const JSTokenLocation&, int, int, int, int, int) { return StatementResult; }
 201     int createForLoop(const JSTokenLocation&, int, int, int, int, int, int) { return StatementResult; }
 202     int createForInLoop(const JSTokenLocation&, int, int, int, int, int, int, int, int) { return StatementResult; }
 203     int createForOfLoop(const JSTokenLocation&, int, int, int, int, int, int, int, int) { return StatementResult; }
 204     int createEmptyStatement(const JSTokenLocation&) { return StatementResult; }
 205     int createVarStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
 206     int createReturnStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
 207     int createBreakStatement(const JSTokenLocation&, int, int) { return StatementResult; }
 208     int createBreakStatement(const JSTokenLocation&, const Identifier*, int, int) { return StatementResult; }
 209     int createContinueStatement(const JSTokenLocation&, int, int) { return StatementResult; }
 210     int createContinueStatement(const JSTokenLocation&, const Identifier*, int, int) { return StatementResult; }
 211     int createTryStatement(const JSTokenLocation&, int, const Identifier*, int, int, int, int) { return StatementResult; }
 212     int createSwitchStatement(const JSTokenLocation&, int, int, int, int, int, int) { return StatementResult; }
 213     int createWhileStatement(const JSTokenLocation&, int, int, int, int) { return StatementResult; }
 214     int createWithStatement(const JSTokenLocation&, int, int, int, int, int, int) { return StatementResult; }
 215     int createDoWhileStatement(const JSTokenLocation&, int, int, int, int) { return StatementResult; }
 216     int createLabelStatement(const JSTokenLocation&, const Identifier*, int, int, int) { return StatementResult; }
 217     int createThrowStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
 218     int createDebugger(const JSTokenLocation&, int, int) { return StatementResult; }
 219     int createConstStatement(const JSTokenLocation&, int, int, int) { return StatementResult; }
 220     int appendConstDecl(const JSTokenLocation&, int, const Identifier*, int) { return StatementResult; }
 221     Property createGetterOrSetterProperty(const JSTokenLocation&, PropertyNode::Type type, bool strict, const Identifier* name, int, int, int, int, int, int, int)
 222     {
 223         ASSERT(name);
 224         if (!strict)
 225             return Property(type);
 226         return Property(name, type);
 227     }
 228     Property createGetterOrSetterProperty(VM* vm, const JSTokenLocation&, PropertyNode::Type type, bool strict, double name, int, int, int, int, int, int, int)
 229     {
 230         if (!strict)
 231             return Property(type);
 232         return Property(&vm->parserArena->identifierArena().makeNumericIdentifier(vm, name), type);
 233     }
 234
 235     void appendStatement(int, int) { }
 236     void addVar(const Identifier*, bool) { }
 237     int combineCommaNodes(const JSTokenLocation&, int, int) { return CommaExpr; }
 238     int evalCount() const { return 0; }
 239     void appendBinaryExpressionInfo(int& operandStackDepth, int expr, int, int, int, bool)
 240     {
 241         if (!m_topBinaryExpr)
 242             m_topBinaryExpr = expr;
 243         else
 244             m_topBinaryExpr = BinaryExpr;
 245         operandStackDepth++;
 246     }
 247
 248     // Logic to handle datastructures used during parsing of binary expressions
 249     void operatorStackPop(int& operatorStackDepth) { operatorStackDepth--; }
 250     bool operatorStackHasHigherPrecedence(int&, int) { return true; }
 251     BinaryOperand getFromOperandStack(int) { return m_topBinaryExpr; }
 252     void shrinkOperandStackBy(int& operandStackDepth, int amount) { operandStackDepth -= amount; }
 253     void appendBinaryOperation(const JSTokenLocation&, int& operandStackDepth, int&, BinaryOperand, BinaryOperand) { operandStackDepth++; }
 254     void operatorStackAppend(int& operatorStackDepth, int, int) { operatorStackDepth++; }
 255     int popOperandStack(int&) { int res = m_topBinaryExpr; m_topBinaryExpr = 0; return res; }
 256
 257     void appendUnaryToken(int& stackDepth, int tok, int) { stackDepth = 1; m_topUnaryToken = tok; }
 258     int unaryTokenStackLastType(int&) { return m_topUnaryToken; }
 259     JSTextPosition unaryTokenStackLastStart(int&) { return JSTextPosition(0, 0, 0); }
 260     void unaryTokenStackRemoveLast(int& stackDepth) { stackDepth = 0; }
 261
 262     void assignmentStackAppend(int, int, int, int, int, Operator) { }
 263     int createAssignment(const JSTokenLocation&, int, int, int, int, int) { RELEASE_ASSERT_NOT_REACHED(); return AssignmentExpr; }
 264     const Identifier* getName(const Property& property) const { ASSERT(property.name); return property.name; }
 265     PropertyNode::Type getType(const Property& property) const { return property.type; }
 266     bool isResolve(ExpressionType expr) const { return expr == ResolveExpr || expr == ResolveEvalExpr; }
 267     ExpressionType createDeconstructingAssignment(const JSTokenLocation&, int, ExpressionType)
 268     {
 269         return DeconstructingAssignment;
 270     }
 271
 272     ArrayPattern createArrayPattern(const JSTokenLocation&)
 273     {
 274         return ArrayDeconstruction;
 275     }
 276     void appendArrayPatternSkipEntry(ArrayPattern, const JSTokenLocation&)
 277     {
 278     }
 279     void appendArrayPatternEntry(ArrayPattern, const JSTokenLocation&, DeconstructionPattern)
 280     {
 281     }
 282     ObjectPattern createObjectPattern(const JSTokenLocation&)
 283     {
 284         return ObjectDeconstruction;
 285     }
 286     void appendObjectPatternEntry(ArrayPattern, const JSTokenLocation&, bool, const Identifier&, DeconstructionPattern)
 287     {
 288     }
 289     DeconstructionPattern createBindingLocation(const JSTokenLocation&, const Identifier&, const JSTextPosition&, const JSTextPosition&)
 290     {
 291         return BindingDeconstruction;
 292     }
 293
 294     bool isBindingNode(DeconstructionPattern pattern)
 295     {
 296         return pattern == BindingDeconstruction;
 297     }
 298
 299 private:
 300     int m_topBinaryExpr;
 301     int m_topUnaryToken;
 302     Vector<int, 8> m_topBinaryExprs;
 303     Vector<int, 8> m_topUnaryTokens;
 304 };
 305
 306 }
 307
 308 #endif