kc3-lang/angle/src/compiler/ParseHelper.h

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• Author : alokp@chromium.org
  Date : 2010-11-12 15:42:16
  Hash : 044a5cf8
  Message : Refactored glslang grammar files to make: - lexer and parser reentrant - line number handling automatic Caveats: - The preprocessor is still not thread-safe and full of bugs. I have another not-yet-ready patch to replace the preprocessor. - The grammar files use options that are not supported by the old versions of flex and bison checked into compiler/tools. So I need to check-in the generated lexer-parser along with a shell script to generate them. Review URL: http://codereview.appspot.com/2992041 git-svn-id: https://angleproject.googlecode.com/svn/trunk@475 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/ParseHelper.h

• //
  // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  #ifndef _PARSER_HELPER_INCLUDED_
  #define _PARSER_HELPER_INCLUDED_
  
  #include "compiler/ExtensionBehavior.h"
  #include "compiler/localintermediate.h"
  #include "compiler/ShHandle.h"
  #include "compiler/SymbolTable.h"
  
  struct TMatrixFields {
      bool wholeRow;
      bool wholeCol;
      int row;
      int col;
  };
  
  struct TPragma {
      TPragma(bool o, bool d) : optimize(o), debug(d) { }
      bool optimize;
      bool debug;
      TPragmaTable pragmaTable;
  };
  
  //
  // The following are extra variables needed during parsing, grouped together so
  // they can be passed to the parser without needing a global.
  //
  struct TParseContext {
      TParseContext(TSymbolTable& symt, const TExtensionBehavior& ext, TIntermediate& interm, ShShaderType type, ShShaderSpec spec, TInfoSink& is) :
              intermediate(interm), symbolTable(symt), extensionBehavior(ext), infoSink(is), shaderType(type), shaderSpec(spec), treeRoot(0),
              recoveredFromError(false), numErrors(0), lexAfterType(false), loopNestingLevel(0),
              inTypeParen(false), scanner(NULL), contextPragma(true, false) {  }
      TIntermediate& intermediate; // to hold and build a parse tree
      TSymbolTable& symbolTable;   // symbol table that goes with the language currently being parsed
      TExtensionBehavior extensionBehavior;  // mapping between supported extensions and current behavior.
      TInfoSink& infoSink;
      ShShaderType shaderType;              // vertex or fragment language (future: pack or unpack)
      ShShaderSpec shaderSpec;              // The language specification compiler conforms to - GLES2 or WebGL.
      TIntermNode* treeRoot;       // root of parse tree being created
      bool recoveredFromError;     // true if a parse error has occurred, but we continue to parse
      int numErrors;
      bool lexAfterType;           // true if we've recognized a type, so can only be looking for an identifier
      int loopNestingLevel;        // 0 if outside all loops
      bool inTypeParen;            // true if in parentheses, looking only for an identifier
      const TType* currentFunctionType;  // the return type of the function that's currently being parsed
      bool functionReturnsValue;   // true if a non-void function has a return
  
      void error(TSourceLoc loc, const char *reason, const char* token,
                 const char* extraInfoFormat, ...);
      void warning(TSourceLoc loc, const char* reason, const char* token,
                   const char* extraInfoFormat, ...);
      bool reservedErrorCheck(int line, const TString& identifier);
      void recover();
  
      bool parseVectorFields(const TString&, int vecSize, TVectorFields&, int line);
      bool parseMatrixFields(const TString&, int matSize, TMatrixFields&, int line);
      void assignError(int line, const char* op, TString left, TString right);
      void unaryOpError(int line, const char* op, TString operand);
      void binaryOpError(int line, const char* op, TString left, TString right);
      bool precisionErrorCheck(int line, TPrecision precision, TBasicType type);
      bool lValueErrorCheck(int line, const char* op, TIntermTyped*);
      bool constErrorCheck(TIntermTyped* node);
      bool integerErrorCheck(TIntermTyped* node, const char* token);
      bool globalErrorCheck(int line, bool global, const char* token);
      bool constructorErrorCheck(int line, TIntermNode*, TFunction&, TOperator, TType*);
      bool arraySizeErrorCheck(int line, TIntermTyped* expr, int& size);
      bool arrayQualifierErrorCheck(int line, TPublicType type);
      bool arrayTypeErrorCheck(int line, TPublicType type);
      bool arrayErrorCheck(int line, TString& identifier, TPublicType type, TVariable*& variable);
      bool voidErrorCheck(int, const TString&, const TPublicType&);
      bool boolErrorCheck(int, const TIntermTyped*);
      bool boolErrorCheck(int, const TPublicType&);
      bool samplerErrorCheck(int line, const TPublicType& pType, const char* reason);
      bool structQualifierErrorCheck(int line, const TPublicType& pType);
      bool parameterSamplerErrorCheck(int line, TQualifier qualifier, const TType& type);
      bool containsSampler(TType& type);
      bool nonInitConstErrorCheck(int line, TString& identifier, TPublicType& type);
      bool nonInitErrorCheck(int line, TString& identifier, TPublicType& type);
      bool paramErrorCheck(int line, TQualifier qualifier, TQualifier paramQualifier, TType* type);
      bool extensionErrorCheck(int line, const TString&);
      const TFunction* findFunction(int line, TFunction* pfnCall, bool *builtIn = 0);
      bool executeInitializer(TSourceLoc line, TString& identifier, TPublicType& pType,
                              TIntermTyped* initializer, TIntermNode*& intermNode, TVariable* variable = 0);
      bool areAllChildConst(TIntermAggregate* aggrNode);
      TIntermTyped* addConstructor(TIntermNode*, const TType*, TOperator, TFunction*, TSourceLoc);
      TIntermTyped* foldConstConstructor(TIntermAggregate* aggrNode, const TType& type);
      TIntermTyped* constructStruct(TIntermNode*, TType*, int, TSourceLoc, bool subset);
      TIntermTyped* constructBuiltIn(const TType*, TOperator, TIntermNode*, TSourceLoc, bool subset);
      TIntermTyped* addConstVectorNode(TVectorFields&, TIntermTyped*, TSourceLoc);
      TIntermTyped* addConstMatrixNode(int , TIntermTyped*, TSourceLoc);
      TIntermTyped* addConstArrayNode(int index, TIntermTyped* node, TSourceLoc line);
      TIntermTyped* addConstStruct(TString& , TIntermTyped*, TSourceLoc);
      bool arraySetMaxSize(TIntermSymbol*, TType*, int, bool, TSourceLoc);
      void* scanner;
      struct TPragma contextPragma;
      TString HashErrMsg;
      bool AfterEOF;
  };
  
  int PaParseStrings(int count, const char* const string[], const int length[],
                     TParseContext* context);
  
  typedef TParseContext* TParseContextPointer;
  extern TParseContextPointer& GetGlobalParseContext();
  #define GlobalParseContext GetGlobalParseContext()
  
  typedef struct TThreadParseContextRec
  {
      TParseContext *lpGlobalParseContext;
  } TThreadParseContext;
  
  #endif // _PARSER_HELPER_INCLUDED_