C++ TSymbolTable::isEmpty方法代码示例

/// Initializize the symbol table
/// \param BuiltInStrings
///      Pointer to built in strings.
/// \param language
///      Shading language to initialize symbol table for
/// \param infoSink
///      Information sink (for errors/warnings)
/// \param symbolTables
///      Array of symbol tables (one for each language)
/// \param bUseGlobalSymbolTable
///      Whether to use the global symbol table or the per-language symbol table
/// \return
///      True if succesfully initialized, false otherwise
bool InitializeSymbolTable( TBuiltInStrings* BuiltInStrings, EShLanguage language, TInfoSink& infoSink, 
                            TSymbolTable* symbolTables, bool bUseGlobalSymbolTable )
{
   TIntermediate intermediate(infoSink); 
   TSymbolTable* symbolTable;

   if ( bUseGlobalSymbolTable )
      symbolTable = symbolTables;
   else
      symbolTable = &symbolTables[language];

   TParseContext parseContext(*symbolTable, intermediate, language, infoSink);

   GlobalParseContext = &parseContext;

   setInitialState();

   assert(symbolTable->isEmpty() || symbolTable->atSharedBuiltInLevel());

   //
   // Parse the built-ins.  This should only happen once per
   // language symbol table.
   //
   // Push the symbol table to give it an initial scope.  This
   // push should not have a corresponding pop, so that built-ins
   // are preserved, and the test for an empty table fails.
   //

   symbolTable->push();

   //Initialize the Preprocessor
   int ret = InitPreprocessor();
   if (ret)
   {
      infoSink.info.message(EPrefixInternalError,  "Unable to intialize the Preprocessor");
      return false;
   }

   for (TBuiltInStrings::iterator i  = BuiltInStrings[parseContext.language].begin();
       i != BuiltInStrings[parseContext.language].end();
       ++i)
   {
      const char* builtInShaders = (*i).c_str();

      if (PaParseString(const_cast<char*>(builtInShaders), parseContext) != 0)
      {
         infoSink.info.message(EPrefixInternalError, "Unable to parse built-ins");
         return false;
      }
   }

   if (  !bUseGlobalSymbolTable )
   {
      IdentifyBuiltIns(parseContext.language, *symbolTable);
   }

   FinalizePreprocessor();

   return true;
}

/// Initializize the symbol table
/// \param BuiltInStrings
///      Pointer to built in strings.
/// \param language
///      Shading language to initialize symbol table for
/// \param infoSink
///      Information sink (for errors/warnings)
/// \param symbolTables
///      Array of symbol tables (one for each language)
/// \param bUseGlobalSymbolTable
///      Whether to use the global symbol table or the per-language symbol table
/// \return
///      True if succesfully initialized, false otherwise
static bool InitializeSymbolTable( TBuiltInStrings* BuiltInStrings, EShLanguage language, TInfoSink& infoSink, 
                            TSymbolTable* symbolTables, bool bUseGlobalSymbolTable )
{
   TSymbolTable* symbolTable;

   if ( bUseGlobalSymbolTable )
      symbolTable = symbolTables;
   else
      symbolTable = &symbolTables[language];

	//@TODO: for now, we use same global symbol table for all target language versions.
	// This is wrong and will have to be changed at some point.
	TParseContext parseContext(*symbolTable, language, ETargetVersionCount, 0, infoSink);

   GlobalParseContext = &parseContext;

   setInitialState();

   assert(symbolTable->isEmpty() || symbolTable->atSharedBuiltInLevel());

   //
   // Parse the built-ins.  This should only happen once per
   // language symbol table.
   //
   // Push the symbol table to give it an initial scope.  This
   // push should not have a corresponding pop, so that built-ins
   // are preserved, and the test for an empty table fails.
   //

   symbolTable->push();

   for (TBuiltInStrings::iterator i  = BuiltInStrings[parseContext.language].begin();
       i != BuiltInStrings[parseContext.language].end();
       ++i)
   {
      const char* builtInShaders = (*i).c_str();

      if (PaParseString(const_cast<char*>(builtInShaders), parseContext, NULL) != 0)
      {
         infoSink.info.message(EPrefixInternalError, "Unable to parse built-ins");
         return false;
      }
   }

   if (  !bUseGlobalSymbolTable )
   {
      IdentifyBuiltIns(parseContext.language, *symbolTable);
   }

   return true;
}

static bool InitializeSymbolTable(
        const TBuiltInStrings& builtInStrings,
        EShLanguage language, EShSpec spec, const TBuiltInResource& resources,
        TInfoSink& infoSink, TSymbolTable& symbolTable)
{
    TIntermediate intermediate(infoSink);
    TParseContext parseContext(symbolTable, intermediate, language, spec, infoSink);

    GlobalParseContext = &parseContext;

    setInitialState();

    assert(symbolTable.isEmpty());       
    //
    // Parse the built-ins.  This should only happen once per
    // language symbol table.
    //
    // Push the symbol table to give it an initial scope.  This
    // push should not have a corresponding pop, so that built-ins
    // are preserved, and the test for an empty table fails.
    //
    symbolTable.push();
    
    //Initialize the Preprocessor
    if (InitPreprocessor())
    {
        infoSink.info.message(EPrefixInternalError,  "Unable to intialize the Preprocessor");
        return false;
    }

    for (TBuiltInStrings::const_iterator i = builtInStrings.begin(); i != builtInStrings.end(); ++i)
    {
        const char* builtInShaders[1];
        int builtInLengths[1];

        builtInShaders[0] = (*i).c_str();
        builtInLengths[0] = (int) (*i).size();

        if (PaParseStrings(const_cast<char**>(builtInShaders), builtInLengths, 1, parseContext) != 0)
        {
            infoSink.info.message(EPrefixInternalError, "Unable to parse built-ins");
            return false;
        }
    }

    IdentifyBuiltIns(language, spec, resources, symbolTable);

    FinalizePreprocessor();

    return true;
}