The Tor Browser: gfx/angle/src/compiler/ParseHelper.cpp@141e0f1194b1 (annotated)

gfx/angle/src/compiler/ParseHelper.cpp@141e0f1194b1 (annotated)

gfx/angle/src/compiler/ParseHelper.cpp

Wed, 31 Dec 2014 07:16:47 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:16:47 +0100
branch: TOR_BUG_9701
changeset 3: 141e0f1194b1
permissions: -rw-r--r--

Revert simplistic fix pending revisit of Mozilla integration attempt.

 //
 // Copyright (c) 2002-2013 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.
 //
 #include "compiler/ParseHelper.h"
 #include <stdarg.h>
 #include <stdio.h>
 #include "compiler/glslang.h"
 #include "compiler/preprocessor/SourceLocation.h"
 ///////////////////////////////////////////////////////////////////////
 //
 // Sub- vector and matrix fields
 //
 ////////////////////////////////////////////////////////////////////////
 //
 // Look at a '.' field selector string and change it into offsets
 // for a vector.
 //
 bool TParseContext::parseVectorFields(const TString& compString, int vecSize, TVectorFields& fields, const TSourceLoc& line)
 {
     fields.num = (int) compString.size();
     if (fields.num > 4) {
         error(line, "illegal vector field selection", compString.c_str());
         return false;
     }
     enum {
         exyzw,
         ergba,
         estpq
     } fieldSet[4];
     for (int i = 0; i < fields.num; ++i) {
         switch (compString[i])  {
         case 'x':
             fields.offsets[i] = 0;
             fieldSet[i] = exyzw;
             break;
         case 'r':
             fields.offsets[i] = 0;
             fieldSet[i] = ergba;
             break;
         case 's':
             fields.offsets[i] = 0;
             fieldSet[i] = estpq;
             break;
         case 'y':
             fields.offsets[i] = 1;
             fieldSet[i] = exyzw;
             break;
         case 'g':
             fields.offsets[i] = 1;
             fieldSet[i] = ergba;
             break;
         case 't':
             fields.offsets[i] = 1;
             fieldSet[i] = estpq;
             break;
         case 'z':
             fields.offsets[i] = 2;
             fieldSet[i] = exyzw;
             break;
         case 'b':
             fields.offsets[i] = 2;
             fieldSet[i] = ergba;
             break;
         case 'p':
             fields.offsets[i] = 2;
             fieldSet[i] = estpq;
             break;
         case 'w':
             fields.offsets[i] = 3;
             fieldSet[i] = exyzw;
             break;
         case 'a':
             fields.offsets[i] = 3;
             fieldSet[i] = ergba;
             break;
         case 'q':
             fields.offsets[i] = 3;
             fieldSet[i] = estpq;
             break;
         default:
             error(line, "illegal vector field selection", compString.c_str());
             return false;
         }
     }
     for (int i = 0; i < fields.num; ++i) {
         if (fields.offsets[i] >= vecSize) {
             error(line, "vector field selection out of range",  compString.c_str());
             return false;
         }
         if (i > 0) {
             if (fieldSet[i] != fieldSet[i-1]) {
                 error(line, "illegal - vector component fields not from the same set", compString.c_str());
                 return false;
             }
         }
     }
     return true;
 }
 //
 // Look at a '.' field selector string and change it into offsets
 // for a matrix.
 //
 bool TParseContext::parseMatrixFields(const TString& compString, int matSize, TMatrixFields& fields, const TSourceLoc& line)
 {
     fields.wholeRow = false;
     fields.wholeCol = false;
     fields.row = -1;
     fields.col = -1;
     if (compString.size() != 2) {
         error(line, "illegal length of matrix field selection", compString.c_str());
         return false;
     }
     if (compString[0] == '_') {
         if (compString[1] < '0' || compString[1] > '3') {
             error(line, "illegal matrix field selection", compString.c_str());
             return false;
         }
         fields.wholeCol = true;
         fields.col = compString[1] - '0';
     } else if (compString[1] == '_') {
         if (compString[0] < '0' || compString[0] > '3') {
             error(line, "illegal matrix field selection", compString.c_str());
             return false;
         }
         fields.wholeRow = true;
         fields.row = compString[0] - '0';
     } else {
         if (compString[0] < '0' || compString[0] > '3' ||
             compString[1] < '0' || compString[1] > '3') {
             error(line, "illegal matrix field selection", compString.c_str());
             return false;
         }
         fields.row = compString[0] - '0';
         fields.col = compString[1] - '0';
     }
     if (fields.row >= matSize || fields.col >= matSize) {
         error(line, "matrix field selection out of range", compString.c_str());
         return false;
     }
     return true;
 }
 ///////////////////////////////////////////////////////////////////////
 //
 // Errors
 //
 ////////////////////////////////////////////////////////////////////////
 //
 // Track whether errors have occurred.
 //
 void TParseContext::recover()
 {
 }
 //
 // Used by flex/bison to output all syntax and parsing errors.
 //
 void TParseContext::error(const TSourceLoc& loc,
                           const char* reason, const char* token,
                           const char* extraInfo)
 {
     pp::SourceLocation srcLoc;
     srcLoc.file = loc.first_file;
     srcLoc.line = loc.first_line;
     diagnostics.writeInfo(pp::Diagnostics::ERROR,
                           srcLoc, reason, token, extraInfo);
 }
 void TParseContext::warning(const TSourceLoc& loc,
                             const char* reason, const char* token,
                             const char* extraInfo) {
     pp::SourceLocation srcLoc;
     srcLoc.file = loc.first_file;
     srcLoc.line = loc.first_line;
     diagnostics.writeInfo(pp::Diagnostics::WARNING,
                           srcLoc, reason, token, extraInfo);
 }
 void TParseContext::trace(const char* str)
 {
     diagnostics.writeDebug(str);
 }
 //
 // Same error message for all places assignments don't work.
 //
 void TParseContext::assignError(const TSourceLoc& line, const char* op, TString left, TString right)
 {
     std::stringstream extraInfoStream;
     extraInfoStream << "cannot convert from '" << right << "' to '" << left << "'";
     std::string extraInfo = extraInfoStream.str();
     error(line, "", op, extraInfo.c_str());
 }
 //
 // Same error message for all places unary operations don't work.
 //
 void TParseContext::unaryOpError(const TSourceLoc& line, const char* op, TString operand)
 {
     std::stringstream extraInfoStream;
     extraInfoStream << "no operation '" << op << "' exists that takes an operand of type " << operand
                     << " (or there is no acceptable conversion)";
     std::string extraInfo = extraInfoStream.str();
     error(line, " wrong operand type", op, extraInfo.c_str());
 }
 //
 // Same error message for all binary operations don't work.
 //
 void TParseContext::binaryOpError(const TSourceLoc& line, const char* op, TString left, TString right)
 {
     std::stringstream extraInfoStream;
     extraInfoStream << "no operation '" << op << "' exists that takes a left-hand operand of type '" << left
                     << "' and a right operand of type '" << right << "' (or there is no acceptable conversion)";
     std::string extraInfo = extraInfoStream.str();
     error(line, " wrong operand types ", op, extraInfo.c_str());
 }
 bool TParseContext::precisionErrorCheck(const TSourceLoc& line, TPrecision precision, TBasicType type){
     if (!checksPrecisionErrors)
         return false;
     switch( type ){
     case EbtFloat:
         if( precision == EbpUndefined ){
             error( line, "No precision specified for (float)", "" );
             return true;
         }
         break;
     case EbtInt:
         if( precision == EbpUndefined ){
             error( line, "No precision specified (int)", "" );
             return true;
         }
         break;
     default:
         return false;
     }
     return false;
 }
 //
 // Both test and if necessary, spit out an error, to see if the node is really
 // an l-value that can be operated on this way.
 //
 // Returns true if the was an error.
 //
 bool TParseContext::lValueErrorCheck(const TSourceLoc& line, const char* op, TIntermTyped* node)
 {
     TIntermSymbol* symNode = node->getAsSymbolNode();
     TIntermBinary* binaryNode = node->getAsBinaryNode();
     if (binaryNode) {
         bool errorReturn;
         switch(binaryNode->getOp()) {
         case EOpIndexDirect:
         case EOpIndexIndirect:
         case EOpIndexDirectStruct:
             return lValueErrorCheck(line, op, binaryNode->getLeft());
         case EOpVectorSwizzle:
             errorReturn = lValueErrorCheck(line, op, binaryNode->getLeft());
             if (!errorReturn) {
                 int offset[4] = {0,0,0,0};
                 TIntermTyped* rightNode = binaryNode->getRight();
                 TIntermAggregate *aggrNode = rightNode->getAsAggregate();
                 for (TIntermSequence::iterator p = aggrNode->getSequence().begin();
                                                p != aggrNode->getSequence().end(); p++) {
                     int value = (*p)->getAsTyped()->getAsConstantUnion()->getIConst(0);
                     offset[value]++;
                     if (offset[value] > 1) {
                         error(line, " l-value of swizzle cannot have duplicate components", op);
                         return true;
                     }
                 }
             }
             return errorReturn;
         default:
             break;
         }
         error(line, " l-value required", op);
         return true;
     }
     const char* symbol = 0;
     if (symNode != 0)
         symbol = symNode->getSymbol().c_str();
     const char* message = 0;
     switch (node->getQualifier()) {
     case EvqConst:          message = "can't modify a const";        break;
     case EvqConstReadOnly:  message = "can't modify a const";        break;
     case EvqAttribute:      message = "can't modify an attribute";   break;
     case EvqUniform:        message = "can't modify a uniform";      break;
     case EvqVaryingIn:      message = "can't modify a varying";      break;
     case EvqFragCoord:      message = "can't modify gl_FragCoord";   break;
     case EvqFrontFacing:    message = "can't modify gl_FrontFacing"; break;
     case EvqPointCoord:     message = "can't modify gl_PointCoord";  break;
     default:
         //
         // Type that can't be written to?
         //
         switch (node->getBasicType()) {
         case EbtSampler2D:
         case EbtSamplerCube:
             message = "can't modify a sampler";
             break;
         case EbtVoid:
             message = "can't modify void";
             break;
         default:
             break;
         }
     }
     if (message == 0 && binaryNode == 0 && symNode == 0) {
         error(line, " l-value required", op);
         return true;
     }
     //
     // Everything else is okay, no error.
     //
     if (message == 0)
         return false;
     //
     // If we get here, we have an error and a message.
     //
     if (symNode) {
         std::stringstream extraInfoStream;
         extraInfoStream << "\"" << symbol << "\" (" << message << ")";
         std::string extraInfo = extraInfoStream.str();
         error(line, " l-value required", op, extraInfo.c_str());
     }
     else {
         std::stringstream extraInfoStream;
         extraInfoStream << "(" << message << ")";
         std::string extraInfo = extraInfoStream.str();
         error(line, " l-value required", op, extraInfo.c_str());
     }
     return true;
 }
 //
 // Both test, and if necessary spit out an error, to see if the node is really
 // a constant.
 //
 // Returns true if the was an error.
 //
 bool TParseContext::constErrorCheck(TIntermTyped* node)
 {
     if (node->getQualifier() == EvqConst)
         return false;
     error(node->getLine(), "constant expression required", "");
     return true;
 }
 //
 // Both test, and if necessary spit out an error, to see if the node is really
 // an integer.
 //
 // Returns true if the was an error.
 //
 bool TParseContext::integerErrorCheck(TIntermTyped* node, const char* token)
 {
     if (node->getBasicType() == EbtInt && node->getNominalSize() == 1)
         return false;
     error(node->getLine(), "integer expression required", token);
     return true;
 }
 //
 // Both test, and if necessary spit out an error, to see if we are currently
 // globally scoped.
 //
 // Returns true if the was an error.
 //
 bool TParseContext::globalErrorCheck(const TSourceLoc& line, bool global, const char* token)
 {
     if (global)
         return false;
     error(line, "only allowed at global scope", token);
     return true;
 }
 //
 // For now, keep it simple:  if it starts "gl_", it's reserved, independent
 // of scope.  Except, if the symbol table is at the built-in push-level,
 // which is when we are parsing built-ins.
 // Also checks for "webgl_" and "_webgl_" reserved identifiers if parsing a
 // webgl shader.
 //
 // Returns true if there was an error.
 //
 bool TParseContext::reservedErrorCheck(const TSourceLoc& line, const TString& identifier)
 {
     static const char* reservedErrMsg = "reserved built-in name";
     if (!symbolTable.atBuiltInLevel()) {
         if (identifier.compare(0, 3, "gl_") == 0) {
             error(line, reservedErrMsg, "gl_");
             return true;
         }
         if (isWebGLBasedSpec(shaderSpec)) {
             if (identifier.compare(0, 6, "webgl_") == 0) {
                 error(line, reservedErrMsg, "webgl_");
                 return true;
             }
             if (identifier.compare(0, 7, "_webgl_") == 0) {
                 error(line, reservedErrMsg, "_webgl_");
                 return true;
             }
             if (shaderSpec == SH_CSS_SHADERS_SPEC && identifier.compare(0, 4, "css_") == 0) {
                 error(line, reservedErrMsg, "css_");
                 return true;
             }
         }
         if (identifier.find("__") != TString::npos) {
             error(line, "identifiers containing two consecutive underscores (__) are reserved as possible future keywords", identifier.c_str());
             return true;
         }
     }
     return false;
 }
 //
 // Make sure there is enough data provided to the constructor to build
 // something of the type of the constructor.  Also returns the type of
 // the constructor.
 //
 // Returns true if there was an error in construction.
 //
 bool TParseContext::constructorErrorCheck(const TSourceLoc& line, TIntermNode* node, TFunction& function, TOperator op, TType* type)
 {
     *type = function.getReturnType();
     bool constructingMatrix = false;
     switch(op) {
     case EOpConstructMat2:
     case EOpConstructMat3:
     case EOpConstructMat4:
         constructingMatrix = true;
         break;
     default:
         break;
     }
     //
     // Note: It's okay to have too many components available, but not okay to have unused
     // arguments.  'full' will go to true when enough args have been seen.  If we loop
     // again, there is an extra argument, so 'overfull' will become true.
     //
     size_t size = 0;
     bool constType = true;
     bool full = false;
     bool overFull = false;
     bool matrixInMatrix = false;
     bool arrayArg = false;
     for (size_t i = 0; i < function.getParamCount(); ++i) {
         const TParameter& param = function.getParam(i);
         size += param.type->getObjectSize();
         if (constructingMatrix && param.type->isMatrix())
             matrixInMatrix = true;
         if (full)
             overFull = true;
         if (op != EOpConstructStruct && !type->isArray() && size >= type->getObjectSize())
             full = true;
         if (param.type->getQualifier() != EvqConst)
             constType = false;
         if (param.type->isArray())
             arrayArg = true;
     }
     if (constType)
         type->setQualifier(EvqConst);
     if (type->isArray() && static_cast<size_t>(type->getArraySize()) != function.getParamCount()) {
         error(line, "array constructor needs one argument per array element", "constructor");
         return true;
     }
     if (arrayArg && op != EOpConstructStruct) {
         error(line, "constructing from a non-dereferenced array", "constructor");
         return true;
     }
     if (matrixInMatrix && !type->isArray()) {
         if (function.getParamCount() != 1) {
           error(line, "constructing matrix from matrix can only take one argument", "constructor");
           return true;
         }
     }
     if (overFull) {
         error(line, "too many arguments", "constructor");
         return true;
     }
     if (op == EOpConstructStruct && !type->isArray() && int(type->getStruct()->fields().size()) != function.getParamCount()) {
         error(line, "Number of constructor parameters does not match the number of structure fields", "constructor");
         return true;
     }
     if (!type->isMatrix() || !matrixInMatrix) {
         if ((op != EOpConstructStruct && size != 1 && size < type->getObjectSize()) ||
             (op == EOpConstructStruct && size < type->getObjectSize())) {
             error(line, "not enough data provided for construction", "constructor");
             return true;
         }
     }
     TIntermTyped *typed = node ? node->getAsTyped() : 0;
     if (typed == 0) {
         error(line, "constructor argument does not have a type", "constructor");
         return true;
     }
     if (op != EOpConstructStruct && IsSampler(typed->getBasicType())) {
         error(line, "cannot convert a sampler", "constructor");
         return true;
     }
     if (typed->getBasicType() == EbtVoid) {
         error(line, "cannot convert a void", "constructor");
         return true;
     }
     return false;
 }
 // This function checks to see if a void variable has been declared and raise an error message for such a case
 //
 // returns true in case of an error
 //
 bool TParseContext::voidErrorCheck(const TSourceLoc& line, const TString& identifier, const TPublicType& pubType)
 {
     if (pubType.type == EbtVoid) {
         error(line, "illegal use of type 'void'", identifier.c_str());
         return true;
     }
     return false;
 }
 // This function checks to see if the node (for the expression) contains a scalar boolean expression or not
 //
 // returns true in case of an error
 //
 bool TParseContext::boolErrorCheck(const TSourceLoc& line, const TIntermTyped* type)
 {
     if (type->getBasicType() != EbtBool || type->isArray() || type->isMatrix() || type->isVector()) {
         error(line, "boolean expression expected", "");
         return true;
     }
     return false;
 }
 // This function checks to see if the node (for the expression) contains a scalar boolean expression or not
 //
 // returns true in case of an error
 //
 bool TParseContext::boolErrorCheck(const TSourceLoc& line, const TPublicType& pType)
 {
     if (pType.type != EbtBool || pType.array || pType.matrix || (pType.size > 1)) {
         error(line, "boolean expression expected", "");
         return true;
     }
     return false;
 }
 bool TParseContext::samplerErrorCheck(const TSourceLoc& line, const TPublicType& pType, const char* reason)
 {
     if (pType.type == EbtStruct) {
         if (containsSampler(*pType.userDef)) {
             error(line, reason, getBasicString(pType.type), "(structure contains a sampler)");
             return true;
         }
         return false;
     } else if (IsSampler(pType.type)) {
         error(line, reason, getBasicString(pType.type));
         return true;
     }
     return false;
 }
 bool TParseContext::structQualifierErrorCheck(const TSourceLoc& line, const TPublicType& pType)
 {
     if ((pType.qualifier == EvqVaryingIn || pType.qualifier == EvqVaryingOut || pType.qualifier == EvqAttribute) &&
         pType.type == EbtStruct) {
         error(line, "cannot be used with a structure", getQualifierString(pType.qualifier));
         return true;
     }
     if (pType.qualifier != EvqUniform && samplerErrorCheck(line, pType, "samplers must be uniform"))
         return true;
     return false;
 }
 bool TParseContext::parameterSamplerErrorCheck(const TSourceLoc& line, TQualifier qualifier, const TType& type)
 {
     if ((qualifier == EvqOut || qualifier == EvqInOut) &&
              type.getBasicType() != EbtStruct && IsSampler(type.getBasicType())) {
         error(line, "samplers cannot be output parameters", type.getBasicString());
         return true;
     }
     return false;
 }
 bool TParseContext::containsSampler(TType& type)
 {
     if (IsSampler(type.getBasicType()))
         return true;
     if (type.getBasicType() == EbtStruct) {
         const TFieldList& fields = type.getStruct()->fields();
         for (unsigned int i = 0; i < fields.size(); ++i) {
             if (containsSampler(*fields[i]->type()))
                 return true;
         }
     }
     return false;
 }
 //
 // Do size checking for an array type's size.
 //
 // Returns true if there was an error.
 //
 bool TParseContext::arraySizeErrorCheck(const TSourceLoc& line, TIntermTyped* expr, int& size)
 {
     TIntermConstantUnion* constant = expr->getAsConstantUnion();
     if (constant == 0 || constant->getBasicType() != EbtInt) {
         error(line, "array size must be a constant integer expression", "");
         return true;
     }
     size = constant->getIConst(0);
     if (size <= 0) {
         error(line, "array size must be a positive integer", "");
         size = 1;
         return true;
     }
     return false;
 }
 //
 // See if this qualifier can be an array.
 //
 // Returns true if there is an error.
 //
 bool TParseContext::arrayQualifierErrorCheck(const TSourceLoc& line, TPublicType type)
 {
     if ((type.qualifier == EvqAttribute) || (type.qualifier == EvqConst)) {
         error(line, "cannot declare arrays of this qualifier", TType(type).getCompleteString().c_str());
         return true;
     }
     return false;
 }
 //
 // See if this type can be an array.
 //
 // Returns true if there is an error.
 //
 bool TParseContext::arrayTypeErrorCheck(const TSourceLoc& line, TPublicType type)
 {
     //
     // Can the type be an array?
     //
     if (type.array) {
         error(line, "cannot declare arrays of arrays", TType(type).getCompleteString().c_str());
         return true;
     }
     return false;
 }
 //
 // Do all the semantic checking for declaring an array, with and
 // without a size, and make the right changes to the symbol table.
 //
 // size == 0 means no specified size.
 //
 // Returns true if there was an error.
 //
 bool TParseContext::arrayErrorCheck(const TSourceLoc& line, TString& identifier, TPublicType type, TVariable*& variable)
 {
     //
     // Don't check for reserved word use until after we know it's not in the symbol table,
     // because reserved arrays can be redeclared.
     //
     bool builtIn = false;
     bool sameScope = false;
     TSymbol* symbol = symbolTable.find(identifier, &builtIn, &sameScope);
     if (symbol == 0 || !sameScope) {
         if (reservedErrorCheck(line, identifier))
             return true;
         variable = new TVariable(&identifier, TType(type));
         if (type.arraySize)
             variable->getType().setArraySize(type.arraySize);
         if (! symbolTable.insert(*variable)) {
             delete variable;
             error(line, "INTERNAL ERROR inserting new symbol", identifier.c_str());
             return true;
         }
     } else {
         if (! symbol->isVariable()) {
             error(line, "variable expected", identifier.c_str());
             return true;
         }
         variable = static_cast<TVariable*>(symbol);
         if (! variable->getType().isArray()) {
             error(line, "redeclaring non-array as array", identifier.c_str());
             return true;
         }
         if (variable->getType().getArraySize() > 0) {
             error(line, "redeclaration of array with size", identifier.c_str());
             return true;
         }
         if (! variable->getType().sameElementType(TType(type))) {
             error(line, "redeclaration of array with a different type", identifier.c_str());
             return true;
         }
         if (type.arraySize)
             variable->getType().setArraySize(type.arraySize);
     }
     if (voidErrorCheck(line, identifier, type))
         return true;
     return false;
 }
 //
 // Enforce non-initializer type/qualifier rules.
 //
 // Returns true if there was an error.
 //
 bool TParseContext::nonInitConstErrorCheck(const TSourceLoc& line, TString& identifier, TPublicType& type, bool array)
 {
     if (type.qualifier == EvqConst)
     {
         // Make the qualifier make sense.
         type.qualifier = EvqTemporary;
         if (array)
         {
             error(line, "arrays may not be declared constant since they cannot be initialized", identifier.c_str());
         }
         else if (type.isStructureContainingArrays())
         {
             error(line, "structures containing arrays may not be declared constant since they cannot be initialized", identifier.c_str());
         }
         else
         {
             error(line, "variables with qualifier 'const' must be initialized", identifier.c_str());
         }
         return true;
     }
     return false;
 }
 //
 // Do semantic checking for a variable declaration that has no initializer,
 // and update the symbol table.
 //
 // Returns true if there was an error.
 //
 bool TParseContext::nonInitErrorCheck(const TSourceLoc& line, TString& identifier, TPublicType& type, TVariable*& variable)
 {
     if (reservedErrorCheck(line, identifier))
         recover();
     variable = new TVariable(&identifier, TType(type));
     if (! symbolTable.insert(*variable)) {
         error(line, "redefinition", variable->getName().c_str());
         delete variable;
         variable = 0;
         return true;
     }
     if (voidErrorCheck(line, identifier, type))
         return true;
     return false;
 }
 bool TParseContext::paramErrorCheck(const TSourceLoc& line, TQualifier qualifier, TQualifier paramQualifier, TType* type)
 {
     if (qualifier != EvqConst && qualifier != EvqTemporary) {
         error(line, "qualifier not allowed on function parameter", getQualifierString(qualifier));
         return true;
     }
     if (qualifier == EvqConst && paramQualifier != EvqIn) {
         error(line, "qualifier not allowed with ", getQualifierString(qualifier), getQualifierString(paramQualifier));
         return true;
     }
     if (qualifier == EvqConst)
         type->setQualifier(EvqConstReadOnly);
     else
         type->setQualifier(paramQualifier);
     return false;
 }
 bool TParseContext::extensionErrorCheck(const TSourceLoc& line, const TString& extension)
 {
     const TExtensionBehavior& extBehavior = extensionBehavior();
     TExtensionBehavior::const_iterator iter = extBehavior.find(extension.c_str());
     if (iter == extBehavior.end()) {
         error(line, "extension", extension.c_str(), "is not supported");
         return true;
     }
     // In GLSL ES, an extension's default behavior is "disable".
     if (iter->second == EBhDisable || iter->second == EBhUndefined) {
         error(line, "extension", extension.c_str(), "is disabled");
         return true;
     }
     if (iter->second == EBhWarn) {
         warning(line, "extension", extension.c_str(), "is being used");
         return false;
     }
     return false;
 }
 bool TParseContext::supportsExtension(const char* extension)
 {
     const TExtensionBehavior& extbehavior = extensionBehavior();
     TExtensionBehavior::const_iterator iter = extbehavior.find(extension);
     return (iter != extbehavior.end());
 }
 bool TParseContext::isExtensionEnabled(const char* extension) const
 {
     const TExtensionBehavior& extbehavior = extensionBehavior();
     TExtensionBehavior::const_iterator iter = extbehavior.find(extension);
     if (iter == extbehavior.end())
     {
         return false;
     }
     return (iter->second == EBhEnable || iter->second == EBhRequire);
 }
 /////////////////////////////////////////////////////////////////////////////////
 //
 // Non-Errors.
 //
 /////////////////////////////////////////////////////////////////////////////////
 //
 // Look up a function name in the symbol table, and make sure it is a function.
 //
 // Return the function symbol if found, otherwise 0.
 //
 const TFunction* TParseContext::findFunction(const TSourceLoc& line, TFunction* call, bool *builtIn)
 {
     // First find by unmangled name to check whether the function name has been
     // hidden by a variable name or struct typename.
     // If a function is found, check for one with a matching argument list.
     const TSymbol* symbol = symbolTable.find(call->getName(), builtIn);
     if (symbol == 0 || symbol->isFunction()) {
         symbol = symbolTable.find(call->getMangledName(), builtIn);
     }
     if (symbol == 0) {
         error(line, "no matching overloaded function found", call->getName().c_str());
         return 0;
     }
     if (!symbol->isFunction()) {
         error(line, "function name expected", call->getName().c_str());
         return 0;
     }
     return static_cast<const TFunction*>(symbol);
 }
 //
 // Initializers show up in several places in the grammar.  Have one set of
 // code to handle them here.
 //
 bool TParseContext::executeInitializer(const TSourceLoc& line, TString& identifier, TPublicType& pType,
                                        TIntermTyped* initializer, TIntermNode*& intermNode, TVariable* variable)
 {
     TType type = TType(pType);
     if (variable == 0) {
         if (reservedErrorCheck(line, identifier))
             return true;
         if (voidErrorCheck(line, identifier, pType))
             return true;
         //
         // add variable to symbol table
         //
         variable = new TVariable(&identifier, type);
         if (! symbolTable.insert(*variable)) {
             error(line, "redefinition", variable->getName().c_str());
             return true;
             // don't delete variable, it's used by error recovery, and the pool
             // pop will take care of the memory
         }
     }
     //
     // identifier must be of type constant, a global, or a temporary
     //
     TQualifier qualifier = variable->getType().getQualifier();
     if ((qualifier != EvqTemporary) && (qualifier != EvqGlobal) && (qualifier != EvqConst)) {
         error(line, " cannot initialize this type of qualifier ", variable->getType().getQualifierString());
         return true;
     }
     //
     // test for and propagate constant
     //
     if (qualifier == EvqConst) {
         if (qualifier != initializer->getType().getQualifier()) {
             std::stringstream extraInfoStream;
             extraInfoStream << "'" << variable->getType().getCompleteString() << "'";
             std::string extraInfo = extraInfoStream.str();
             error(line, " assigning non-constant to", "=", extraInfo.c_str());
             variable->getType().setQualifier(EvqTemporary);
             return true;
         }
         if (type != initializer->getType()) {
             error(line, " non-matching types for const initializer ",
                 variable->getType().getQualifierString());
             variable->getType().setQualifier(EvqTemporary);
             return true;
         }
         if (initializer->getAsConstantUnion()) {
             variable->shareConstPointer(initializer->getAsConstantUnion()->getUnionArrayPointer());
         } else if (initializer->getAsSymbolNode()) {
             const TSymbol* symbol = symbolTable.find(initializer->getAsSymbolNode()->getSymbol());
             const TVariable* tVar = static_cast<const TVariable*>(symbol);
             ConstantUnion* constArray = tVar->getConstPointer();
             variable->shareConstPointer(constArray);
         } else {
             std::stringstream extraInfoStream;
             extraInfoStream << "'" << variable->getType().getCompleteString() << "'";
             std::string extraInfo = extraInfoStream.str();
             error(line, " cannot assign to", "=", extraInfo.c_str());
             variable->getType().setQualifier(EvqTemporary);
             return true;
         }
     }
     if (qualifier != EvqConst) {
         TIntermSymbol* intermSymbol = intermediate.addSymbol(variable->getUniqueId(), variable->getName(), variable->getType(), line);
         intermNode = intermediate.addAssign(EOpInitialize, intermSymbol, initializer, line);
         if (intermNode == 0) {
             assignError(line, "=", intermSymbol->getCompleteString(), initializer->getCompleteString());
             return true;
         }
     } else
         intermNode = 0;
     return false;
 }
 bool TParseContext::areAllChildConst(TIntermAggregate* aggrNode)
 {
     ASSERT(aggrNode != NULL);
     if (!aggrNode->isConstructor())
         return false;
     bool allConstant = true;
     // check if all the child nodes are constants so that they can be inserted into
     // the parent node
     TIntermSequence &sequence = aggrNode->getSequence() ;
     for (TIntermSequence::iterator p = sequence.begin(); p != sequence.end(); ++p) {
         if (!(*p)->getAsTyped()->getAsConstantUnion())
             return false;
     }
     return allConstant;
 }
 // This function is used to test for the correctness of the parameters passed to various constructor functions
 // and also convert them to the right datatype if it is allowed and required.
 //
 // Returns 0 for an error or the constructed node (aggregate or typed) for no error.
 //
 TIntermTyped* TParseContext::addConstructor(TIntermNode* node, const TType* type, TOperator op, TFunction* fnCall, const TSourceLoc& line)
 {
     if (node == 0)
         return 0;
     TIntermAggregate* aggrNode = node->getAsAggregate();
     TFieldList::const_iterator memberFields;
     if (op == EOpConstructStruct)
         memberFields = type->getStruct()->fields().begin();
     TType elementType = *type;
     if (type->isArray())
         elementType.clearArrayness();
     bool singleArg;
     if (aggrNode) {
         if (aggrNode->getOp() != EOpNull || aggrNode->getSequence().size() == 1)
             singleArg = true;
         else
             singleArg = false;
     } else
         singleArg = true;
     TIntermTyped *newNode;
     if (singleArg) {
         // If structure constructor or array constructor is being called
         // for only one parameter inside the structure, we need to call constructStruct function once.
         if (type->isArray())
             newNode = constructStruct(node, &elementType, 1, node->getLine(), false);
         else if (op == EOpConstructStruct)
             newNode = constructStruct(node, (*memberFields)->type(), 1, node->getLine(), false);
         else
             newNode = constructBuiltIn(type, op, node, node->getLine(), false);
         if (newNode && newNode->getAsAggregate()) {
             TIntermTyped* constConstructor = foldConstConstructor(newNode->getAsAggregate(), *type);
             if (constConstructor)
                 return constConstructor;
         }
         return newNode;
     }
     //
     // Handle list of arguments.
     //
     TIntermSequence &sequenceVector = aggrNode->getSequence() ;    // Stores the information about the parameter to the constructor
     // if the structure constructor contains more than one parameter, then construct
     // each parameter
     int paramCount = 0;  // keeps a track of the constructor parameter number being checked
     // for each parameter to the constructor call, check to see if the right type is passed or convert them
     // to the right type if possible (and allowed).
     // for structure constructors, just check if the right type is passed, no conversion is allowed.
     for (TIntermSequence::iterator p = sequenceVector.begin();
                                    p != sequenceVector.end(); p++, paramCount++) {
         if (type->isArray())
             newNode = constructStruct(*p, &elementType, paramCount+1, node->getLine(), true);
         else if (op == EOpConstructStruct)
             newNode = constructStruct(*p, memberFields[paramCount]->type(), paramCount+1, node->getLine(), true);
         else
             newNode = constructBuiltIn(type, op, *p, node->getLine(), true);
         if (newNode) {
             *p = newNode;
         }
     }
     TIntermTyped* constructor = intermediate.setAggregateOperator(aggrNode, op, line);
     TIntermTyped* constConstructor = foldConstConstructor(constructor->getAsAggregate(), *type);
     if (constConstructor)
         return constConstructor;
     return constructor;
 }
 TIntermTyped* TParseContext::foldConstConstructor(TIntermAggregate* aggrNode, const TType& type)
 {
     bool canBeFolded = areAllChildConst(aggrNode);
     aggrNode->setType(type);
     if (canBeFolded) {
         bool returnVal = false;
         ConstantUnion* unionArray = new ConstantUnion[type.getObjectSize()];
         if (aggrNode->getSequence().size() == 1)  {
             returnVal = intermediate.parseConstTree(aggrNode->getLine(), aggrNode, unionArray, aggrNode->getOp(), symbolTable,  type, true);
         }
         else {
             returnVal = intermediate.parseConstTree(aggrNode->getLine(), aggrNode, unionArray, aggrNode->getOp(), symbolTable,  type);
         }
         if (returnVal)
             return 0;
         return intermediate.addConstantUnion(unionArray, type, aggrNode->getLine());
     }
     return 0;
 }
 // Function for constructor implementation. Calls addUnaryMath with appropriate EOp value
 // for the parameter to the constructor (passed to this function). Essentially, it converts
 // the parameter types correctly. If a constructor expects an int (like ivec2) and is passed a
 // float, then float is converted to int.
 //
 // Returns 0 for an error or the constructed node.
 //
 TIntermTyped* TParseContext::constructBuiltIn(const TType* type, TOperator op, TIntermNode* node, const TSourceLoc& line, bool subset)
 {
     TIntermTyped* newNode;
     TOperator basicOp;
     //
     // First, convert types as needed.
     //
     switch (op) {
     case EOpConstructVec2:
     case EOpConstructVec3:
     case EOpConstructVec4:
     case EOpConstructMat2:
     case EOpConstructMat3:
     case EOpConstructMat4:
     case EOpConstructFloat:
         basicOp = EOpConstructFloat;
         break;
     case EOpConstructIVec2:
     case EOpConstructIVec3:
     case EOpConstructIVec4:
     case EOpConstructInt:
         basicOp = EOpConstructInt;
         break;
     case EOpConstructBVec2:
     case EOpConstructBVec3:
     case EOpConstructBVec4:
     case EOpConstructBool:
         basicOp = EOpConstructBool;
         break;
     default:
         error(line, "unsupported construction", "");
         recover();
         return 0;
     }
     newNode = intermediate.addUnaryMath(basicOp, node, node->getLine(), symbolTable);
     if (newNode == 0) {
         error(line, "can't convert", "constructor");
         return 0;
     }
     //
     // Now, if there still isn't an operation to do the construction, and we need one, add one.
     //
     // Otherwise, skip out early.
     if (subset || (newNode != node && newNode->getType() == *type))
         return newNode;
     // setAggregateOperator will insert a new node for the constructor, as needed.
     return intermediate.setAggregateOperator(newNode, op, line);
 }
 // This function tests for the type of the parameters to the structures constructors. Raises
 // an error message if the expected type does not match the parameter passed to the constructor.
 //
 // Returns 0 for an error or the input node itself if the expected and the given parameter types match.
 //
 TIntermTyped* TParseContext::constructStruct(TIntermNode* node, TType* type, int paramCount, const TSourceLoc& line, bool subset)
 {
     if (*type == node->getAsTyped()->getType()) {
         if (subset)
             return node->getAsTyped();
         else
             return intermediate.setAggregateOperator(node->getAsTyped(), EOpConstructStruct, line);
     } else {
         std::stringstream extraInfoStream;
         extraInfoStream << "cannot convert parameter " << paramCount
                         << " from '" << node->getAsTyped()->getType().getBasicString()
                         << "' to '" << type->getBasicString() << "'";
         std::string extraInfo = extraInfoStream.str();
         error(line, "", "constructor", extraInfo.c_str());
         recover();
     }
     return 0;
 }
 //
 // This function returns the tree representation for the vector field(s) being accessed from contant vector.
 // If only one component of vector is accessed (v.x or v[0] where v is a contant vector), then a contant node is
 // returned, else an aggregate node is returned (for v.xy). The input to this function could either be the symbol
 // node or it could be the intermediate tree representation of accessing fields in a constant structure or column of
 // a constant matrix.
 //
 TIntermTyped* TParseContext::addConstVectorNode(TVectorFields& fields, TIntermTyped* node, const TSourceLoc& line)
 {
     TIntermTyped* typedNode;
     TIntermConstantUnion* tempConstantNode = node->getAsConstantUnion();
     ConstantUnion *unionArray;
     if (tempConstantNode) {
         unionArray = tempConstantNode->getUnionArrayPointer();
         if (!unionArray) {
             return node;
         }
     } else { // The node has to be either a symbol node or an aggregate node or a tempConstant node, else, its an error
         error(line, "Cannot offset into the vector", "Error");
         recover();
         return 0;
     }
     ConstantUnion* constArray = new ConstantUnion[fields.num];
     for (int i = 0; i < fields.num; i++) {
         if (fields.offsets[i] >= node->getType().getNominalSize()) {
             std::stringstream extraInfoStream;
             extraInfoStream << "vector field selection out of range '" << fields.offsets[i] << "'";
             std::string extraInfo = extraInfoStream.str();
             error(line, "", "[", extraInfo.c_str());
             recover();
             fields.offsets[i] = 0;
         }
         constArray[i] = unionArray[fields.offsets[i]];
     }
     typedNode = intermediate.addConstantUnion(constArray, node->getType(), line);
     return typedNode;
 }
 //
 // This function returns the column being accessed from a constant matrix. The values are retrieved from
 // the symbol table and parse-tree is built for a vector (each column of a matrix is a vector). The input
 // to the function could either be a symbol node (m[0] where m is a constant matrix)that represents a
 // constant matrix or it could be the tree representation of the constant matrix (s.m1[0] where s is a constant structure)
 //
 TIntermTyped* TParseContext::addConstMatrixNode(int index, TIntermTyped* node, const TSourceLoc& line)
 {
     TIntermTyped* typedNode;
     TIntermConstantUnion* tempConstantNode = node->getAsConstantUnion();
     if (index >= node->getType().getNominalSize()) {
         std::stringstream extraInfoStream;
         extraInfoStream << "matrix field selection out of range '" << index << "'";
         std::string extraInfo = extraInfoStream.str();
         error(line, "", "[", extraInfo.c_str());
         recover();
         index = 0;
     }
     if (tempConstantNode) {
          ConstantUnion* unionArray = tempConstantNode->getUnionArrayPointer();
          int size = tempConstantNode->getType().getNominalSize();
          typedNode = intermediate.addConstantUnion(&unionArray[size*index], tempConstantNode->getType(), line);
     } else {
         error(line, "Cannot offset into the matrix", "Error");
         recover();
         return 0;
     }
     return typedNode;
 }
 //
 // This function returns an element of an array accessed from a constant array. The values are retrieved from
 // the symbol table and parse-tree is built for the type of the element. The input
 // to the function could either be a symbol node (a[0] where a is a constant array)that represents a
 // constant array or it could be the tree representation of the constant array (s.a1[0] where s is a constant structure)
 //
 TIntermTyped* TParseContext::addConstArrayNode(int index, TIntermTyped* node, const TSourceLoc& line)
 {
     TIntermTyped* typedNode;
     TIntermConstantUnion* tempConstantNode = node->getAsConstantUnion();
     TType arrayElementType = node->getType();
     arrayElementType.clearArrayness();
     if (index >= node->getType().getArraySize()) {
         std::stringstream extraInfoStream;
         extraInfoStream << "array field selection out of range '" << index << "'";
         std::string extraInfo = extraInfoStream.str();
         error(line, "", "[", extraInfo.c_str());
         recover();
         index = 0;
     }
     if (tempConstantNode) {
          size_t arrayElementSize = arrayElementType.getObjectSize();
          ConstantUnion* unionArray = tempConstantNode->getUnionArrayPointer();
          typedNode = intermediate.addConstantUnion(&unionArray[arrayElementSize * index], tempConstantNode->getType(), line);
     } else {
         error(line, "Cannot offset into the array", "Error");
         recover();
         return 0;
     }
     return typedNode;
 }
 //
 // This function returns the value of a particular field inside a constant structure from the symbol table.
 // If there is an embedded/nested struct, it appropriately calls addConstStructNested or addConstStructFromAggr
 // function and returns the parse-tree with the values of the embedded/nested struct.
 //
 TIntermTyped* TParseContext::addConstStruct(TString& identifier, TIntermTyped* node, const TSourceLoc& line)
 {
     const TFieldList& fields = node->getType().getStruct()->fields();
     size_t instanceSize = 0;
     for (size_t index = 0; index < fields.size(); ++index) {
         if (fields[index]->name() == identifier) {
             break;
         } else {
             instanceSize += fields[index]->type()->getObjectSize();
         }
     }
     TIntermTyped* typedNode = 0;
     TIntermConstantUnion* tempConstantNode = node->getAsConstantUnion();
     if (tempConstantNode) {
          ConstantUnion* constArray = tempConstantNode->getUnionArrayPointer();
          typedNode = intermediate.addConstantUnion(constArray+instanceSize, tempConstantNode->getType(), line); // type will be changed in the calling function
     } else {
         error(line, "Cannot offset into the structure", "Error");
         recover();
         return 0;
     }
     return typedNode;
 }
 bool TParseContext::enterStructDeclaration(const TSourceLoc& line, const TString& identifier)
 {
     ++structNestingLevel;
     // Embedded structure definitions are not supported per GLSL ES spec.
     // They aren't allowed in GLSL either, but we need to detect this here
     // so we don't rely on the GLSL compiler to catch it.
     if (structNestingLevel > 1) {
         error(line, "", "Embedded struct definitions are not allowed");
         return true;
     }
     return false;
 }
 void TParseContext::exitStructDeclaration()
 {
     --structNestingLevel;
 }
 namespace {
 const int kWebGLMaxStructNesting = 4;
 }  // namespace
 bool TParseContext::structNestingErrorCheck(const TSourceLoc& line, const TField& field)
 {
     if (!isWebGLBasedSpec(shaderSpec)) {
         return false;
     }
     if (field.type()->getBasicType() != EbtStruct) {
         return false;
     }
     // We're already inside a structure definition at this point, so add
     // one to the field's struct nesting.
     if (1 + field.type()->getDeepestStructNesting() > kWebGLMaxStructNesting) {
         std::stringstream extraInfoStream;
         extraInfoStream << "Reference of struct type " << field.name()
                         << " exceeds maximum struct nesting of " << kWebGLMaxStructNesting;
         std::string extraInfo = extraInfoStream.str();
         error(line, "", "", extraInfo.c_str());
         return true;
     }
     return false;
 }
 //
 // Parse an array index expression
 //
 TIntermTyped* TParseContext::addIndexExpression(TIntermTyped *baseExpression, const TSourceLoc& location, TIntermTyped *indexExpression)
 {
     TIntermTyped *indexedExpression = NULL;
     if (!baseExpression->isArray() && !baseExpression->isMatrix() && !baseExpression->isVector())
     {
         if (baseExpression->getAsSymbolNode())
         {
             error(location, " left of '[' is not of type array, matrix, or vector ", baseExpression->getAsSymbolNode()->getSymbol().c_str());
         }
         else
         {
             error(location, " left of '[' is not of type array, matrix, or vector ", "expression");
         }
         recover();
     }
     if (indexExpression->getQualifier() == EvqConst)
     {
         int index = indexExpression->getAsConstantUnion()->getIConst(0);
         if (index < 0)
         {
             std::stringstream infoStream;
             infoStream << index;
             std::string info = infoStream.str();
             error(location, "negative index", info.c_str());
             recover();
             index = 0;
         }
         if (baseExpression->getType().getQualifier() == EvqConst)
         {
             if (baseExpression->isArray())
             {
                 // constant folding for arrays
                 indexedExpression = addConstArrayNode(index, baseExpression, location);
             }
             else if (baseExpression->isVector())
             {
                 // constant folding for vectors
                 TVectorFields fields;
                 fields.num = 1;
                 fields.offsets[0] = index; // need to do it this way because v.xy sends fields integer array
                 indexedExpression = addConstVectorNode(fields, baseExpression, location);
             }
             else if (baseExpression->isMatrix())
             {
                 // constant folding for matrices
                 indexedExpression = addConstMatrixNode(index, baseExpression, location);
             }
         }
         else
         {
             if (baseExpression->isArray())
             {
                 if (index >= baseExpression->getType().getArraySize())
                 {
                     std::stringstream extraInfoStream;
                     extraInfoStream << "array index out of range '" << index << "'";
                     std::string extraInfo = extraInfoStream.str();
                     error(location, "", "[", extraInfo.c_str());
                     recover();
                     index = baseExpression->getType().getArraySize() - 1;
                 }
                 else if (baseExpression->getQualifier() == EvqFragData && index > 0 && !isExtensionEnabled("GL_EXT_draw_buffers"))
                 {
                     error(location, "", "[", "array indexes for gl_FragData must be zero when GL_EXT_draw_buffers is disabled");
                     recover();
                     index = 0;
                 }
             }
             else if ((baseExpression->isVector() || baseExpression->isMatrix()) && baseExpression->getType().getNominalSize() <= index)
             {
                 std::stringstream extraInfoStream;
                 extraInfoStream << "field selection out of range '" << index << "'";
                 std::string extraInfo = extraInfoStream.str();
                 error(location, "", "[", extraInfo.c_str());
                 recover();
                 index = baseExpression->getType().getNominalSize() - 1;
             }
             indexExpression->getAsConstantUnion()->getUnionArrayPointer()->setIConst(index);
             indexedExpression = intermediate.addIndex(EOpIndexDirect, baseExpression, indexExpression, location);
         }
     }
     else
     {
         indexedExpression = intermediate.addIndex(EOpIndexIndirect, baseExpression, indexExpression, location);
     }
     if (indexedExpression == 0)
     {
         ConstantUnion *unionArray = new ConstantUnion[1];
         unionArray->setFConst(0.0f);
         indexedExpression = intermediate.addConstantUnion(unionArray, TType(EbtFloat, EbpHigh, EvqConst), location);
     }
     else if (baseExpression->isArray())
     {
         const TType &baseType = baseExpression->getType();
         if (baseType.getStruct())
         {
             TType copyOfType(baseType.getStruct());
             indexedExpression->setType(copyOfType);
         }
         else
         {
             indexedExpression->setType(TType(baseExpression->getBasicType(), baseExpression->getPrecision(), EvqTemporary, baseExpression->getNominalSize(), baseExpression->isMatrix()));
         }
         if (baseExpression->getType().getQualifier() == EvqConst)
         {
             indexedExpression->getTypePointer()->setQualifier(EvqConst);
         }
     }
     else if (baseExpression->isMatrix())
     {
         TQualifier qualifier = baseExpression->getType().getQualifier() == EvqConst ? EvqConst : EvqTemporary;
         indexedExpression->setType(TType(baseExpression->getBasicType(), baseExpression->getPrecision(), qualifier, baseExpression->getNominalSize()));
     }
     else if (baseExpression->isVector())
     {
         TQualifier qualifier = baseExpression->getType().getQualifier() == EvqConst ? EvqConst : EvqTemporary;
         indexedExpression->setType(TType(baseExpression->getBasicType(), baseExpression->getPrecision(), qualifier));
     }
     else
     {
         indexedExpression->setType(baseExpression->getType());
     }
     return indexedExpression;
 }
 //
 // Parse an array of strings using yyparse.
 //
 // Returns 0 for success.
 //
 int PaParseStrings(size_t count, const char* const string[], const int length[],
                    TParseContext* context) {
     if ((count == 0) || (string == NULL))
         return 1;
     if (glslang_initialize(context))
         return 1;
     int error = glslang_scan(count, string, length, context);
     if (!error)
         error = glslang_parse(context);
     glslang_finalize(context);
     return (error == 0) && (context->numErrors() == 0) ? 0 : 1;
 }

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gfx/angle/src/compiler/ParseHelper.cpp@141e0f1194b1 (annotated)

gfx/angle/src/compiler/ParseHelper.cpp