2 // Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved.
3 // Use of this source code is governed by a BSD-style license that can be
4 // found in the LICENSE file.
7 #include "ParseHelper.h"
13 #include "preprocessor/SourceLocation.h"
15 ///////////////////////////////////////////////////////////////////////
17 // Sub- vector and matrix fields
19 ////////////////////////////////////////////////////////////////////////
22 // Look at a '.' field selector string and change it into offsets
25 bool TParseContext::parseVectorFields(const TString& compString, int vecSize, TVectorFields& fields, int line)
27 fields.num = (int) compString.size();
29 error(line, "illegal vector field selection", compString.c_str());
39 for (int i = 0; i < fields.num; ++i) {
40 switch (compString[i]) {
42 fields.offsets[i] = 0;
46 fields.offsets[i] = 0;
50 fields.offsets[i] = 0;
54 fields.offsets[i] = 1;
58 fields.offsets[i] = 1;
62 fields.offsets[i] = 1;
66 fields.offsets[i] = 2;
70 fields.offsets[i] = 2;
74 fields.offsets[i] = 2;
78 fields.offsets[i] = 3;
82 fields.offsets[i] = 3;
86 fields.offsets[i] = 3;
90 error(line, "illegal vector field selection", compString.c_str());
95 for (int i = 0; i < fields.num; ++i) {
96 if (fields.offsets[i] >= vecSize) {
97 error(line, "vector field selection out of range", compString.c_str());
102 if (fieldSet[i] != fieldSet[i-1]) {
103 error(line, "illegal - vector component fields not from the same set", compString.c_str());
114 // Look at a '.' field selector string and change it into offsets
117 bool TParseContext::parseMatrixFields(const TString& compString, int matCols, int matRows, TMatrixFields& fields, int line)
119 fields.wholeRow = false;
120 fields.wholeCol = false;
124 if (compString.size() != 2) {
125 error(line, "illegal length of matrix field selection", compString.c_str());
129 if (compString[0] == '_') {
130 if (compString[1] < '0' || compString[1] > '3') {
131 error(line, "illegal matrix field selection", compString.c_str());
134 fields.wholeCol = true;
135 fields.col = compString[1] - '0';
136 } else if (compString[1] == '_') {
137 if (compString[0] < '0' || compString[0] > '3') {
138 error(line, "illegal matrix field selection", compString.c_str());
141 fields.wholeRow = true;
142 fields.row = compString[0] - '0';
144 if (compString[0] < '0' || compString[0] > '3' ||
145 compString[1] < '0' || compString[1] > '3') {
146 error(line, "illegal matrix field selection", compString.c_str());
149 fields.row = compString[0] - '0';
150 fields.col = compString[1] - '0';
153 if (fields.row >= matRows || fields.col >= matCols) {
154 error(line, "matrix field selection out of range", compString.c_str());
161 ///////////////////////////////////////////////////////////////////////
165 ////////////////////////////////////////////////////////////////////////
168 // Track whether errors have occurred.
170 void TParseContext::recover()
175 // Used by flex/bison to output all syntax and parsing errors.
177 void TParseContext::error(TSourceLoc loc,
178 const char* reason, const char* token,
179 const char* extraInfo)
181 pp::SourceLocation srcLoc;
182 DecodeSourceLoc(loc, &srcLoc.file, &srcLoc.line);
183 diagnostics.writeInfo(pp::Diagnostics::PP_ERROR,
184 srcLoc, reason, token, extraInfo);
188 void TParseContext::warning(TSourceLoc loc,
189 const char* reason, const char* token,
190 const char* extraInfo) {
191 pp::SourceLocation srcLoc;
192 DecodeSourceLoc(loc, &srcLoc.file, &srcLoc.line);
193 diagnostics.writeInfo(pp::Diagnostics::PP_WARNING,
194 srcLoc, reason, token, extraInfo);
197 void TParseContext::trace(const char* str)
199 diagnostics.writeDebug(str);
203 // Same error message for all places assignments don't work.
205 void TParseContext::assignError(int line, const char* op, TString left, TString right)
207 std::stringstream extraInfoStream;
208 extraInfoStream << "cannot convert from '" << right << "' to '" << left << "'";
209 std::string extraInfo = extraInfoStream.str();
210 error(line, "", op, extraInfo.c_str());
214 // Same error message for all places unary operations don't work.
216 void TParseContext::unaryOpError(int line, const char* op, TString operand)
218 std::stringstream extraInfoStream;
219 extraInfoStream << "no operation '" << op << "' exists that takes an operand of type " << operand
220 << " (or there is no acceptable conversion)";
221 std::string extraInfo = extraInfoStream.str();
222 error(line, " wrong operand type", op, extraInfo.c_str());
226 // Same error message for all binary operations don't work.
228 void TParseContext::binaryOpError(int line, const char* op, TString left, TString right)
230 std::stringstream extraInfoStream;
231 extraInfoStream << "no operation '" << op << "' exists that takes a left-hand operand of type '" << left
232 << "' and a right operand of type '" << right << "' (or there is no acceptable conversion)";
233 std::string extraInfo = extraInfoStream.str();
234 error(line, " wrong operand types ", op, extraInfo.c_str());
237 bool TParseContext::precisionErrorCheck(int line, TPrecision precision, TBasicType type){
238 if (!checksPrecisionErrors)
242 if( precision == EbpUndefined ){
243 error( line, "No precision specified for (float)", "" );
248 if( precision == EbpUndefined ){
249 error( line, "No precision specified (int)", "" );
260 // Both test and if necessary, spit out an error, to see if the node is really
261 // an l-value that can be operated on this way.
263 // Returns true if the was an error.
265 bool TParseContext::lValueErrorCheck(int line, const char* op, TIntermTyped* node)
267 TIntermSymbol* symNode = node->getAsSymbolNode();
268 TIntermBinary* binaryNode = node->getAsBinaryNode();
273 switch(binaryNode->getOp()) {
275 case EOpIndexIndirect:
276 case EOpIndexDirectStruct:
277 return lValueErrorCheck(line, op, binaryNode->getLeft());
278 case EOpVectorSwizzle:
279 errorReturn = lValueErrorCheck(line, op, binaryNode->getLeft());
281 int offset[4] = {0,0,0,0};
283 TIntermTyped* rightNode = binaryNode->getRight();
284 TIntermAggregate *aggrNode = rightNode->getAsAggregate();
286 for (TIntermSequence::iterator p = aggrNode->getSequence().begin();
287 p != aggrNode->getSequence().end(); p++) {
288 int value = (*p)->getAsTyped()->getAsConstantUnion()->getIConst(0);
290 if (offset[value] > 1) {
291 error(line, " l-value of swizzle cannot have duplicate components", op);
302 error(line, " l-value required", op);
308 const char* symbol = 0;
310 symbol = symNode->getSymbol().c_str();
312 const char* message = 0;
313 switch (node->getQualifier()) {
314 case EvqConstExpr: message = "can't modify a const"; break;
315 case EvqConstReadOnly: message = "can't modify a const"; break;
316 case EvqAttribute: message = "can't modify an attribute"; break;
317 case EvqFragmentIn: message = "can't modify an input"; break;
318 case EvqVertexIn: message = "can't modify an input"; break;
319 case EvqUniform: message = "can't modify a uniform"; break;
323 case EvqVaryingIn: message = "can't modify a varying"; break;
324 case EvqInput: message = "can't modify an input"; break;
325 case EvqFragCoord: message = "can't modify gl_FragCoord"; break;
326 case EvqFrontFacing: message = "can't modify gl_FrontFacing"; break;
327 case EvqPointCoord: message = "can't modify gl_PointCoord"; break;
328 case EvqInstanceID: message = "can't modify gl_InstanceID"; break;
332 // Type that can't be written to?
334 if(IsSampler(node->getBasicType()))
336 message = "can't modify a sampler";
338 else if(node->getBasicType() == EbtVoid)
340 message = "can't modify void";
344 if (message == 0 && binaryNode == 0 && symNode == 0) {
345 error(line, " l-value required", op);
352 // Everything else is okay, no error.
358 // If we get here, we have an error and a message.
361 std::stringstream extraInfoStream;
362 extraInfoStream << "\"" << symbol << "\" (" << message << ")";
363 std::string extraInfo = extraInfoStream.str();
364 error(line, " l-value required", op, extraInfo.c_str());
367 std::stringstream extraInfoStream;
368 extraInfoStream << "(" << message << ")";
369 std::string extraInfo = extraInfoStream.str();
370 error(line, " l-value required", op, extraInfo.c_str());
377 // Both test, and if necessary spit out an error, to see if the node is really
380 // Returns true if the was an error.
382 bool TParseContext::constErrorCheck(TIntermTyped* node)
384 if (node->getQualifier() == EvqConstExpr)
387 error(node->getLine(), "constant expression required", "");
393 // Both test, and if necessary spit out an error, to see if the node is really
396 // Returns true if the was an error.
398 bool TParseContext::integerErrorCheck(TIntermTyped* node, const char* token)
400 if (node->isScalarInt())
403 error(node->getLine(), "integer expression required", token);
409 // Both test, and if necessary spit out an error, to see if we are currently
412 // Returns true if the was an error.
414 bool TParseContext::globalErrorCheck(int line, bool global, const char* token)
419 error(line, "only allowed at global scope", token);
425 // For now, keep it simple: if it starts "gl_", it's reserved, independent
426 // of scope. Except, if the symbol table is at the built-in push-level,
427 // which is when we are parsing built-ins.
428 // Also checks for "webgl_" and "_webgl_" reserved identifiers if parsing a
431 // Returns true if there was an error.
433 bool TParseContext::reservedErrorCheck(int line, const TString& identifier)
435 static const char* reservedErrMsg = "reserved built-in name";
436 if (!symbolTable.atBuiltInLevel()) {
437 if (identifier.compare(0, 3, "gl_") == 0) {
438 error(line, reservedErrMsg, "gl_");
441 if (identifier.find("__") != TString::npos) {
442 error(line, "identifiers containing two consecutive underscores (__) are reserved as possible future keywords", identifier.c_str());
451 // Make sure there is enough data provided to the constructor to build
452 // something of the type of the constructor. Also returns the type of
455 // Returns true if there was an error in construction.
457 bool TParseContext::constructorErrorCheck(int line, TIntermNode* node, TFunction& function, TOperator op, TType* type)
459 *type = function.getReturnType();
461 bool constructingMatrix = false;
463 case EOpConstructMat2:
464 case EOpConstructMat3:
465 case EOpConstructMat4:
466 constructingMatrix = true;
473 // Note: It's okay to have too many components available, but not okay to have unused
474 // arguments. 'full' will go to true when enough args have been seen. If we loop
475 // again, there is an extra argument, so 'overfull' will become true.
479 bool constType = true;
481 bool overFull = false;
482 bool matrixInMatrix = false;
483 bool arrayArg = false;
484 for (int i = 0; i < function.getParamCount(); ++i) {
485 const TParameter& param = function.getParam(i);
486 size += param.type->getObjectSize();
488 if (constructingMatrix && param.type->isMatrix())
489 matrixInMatrix = true;
492 if (op != EOpConstructStruct && !type->isArray() && size >= type->getObjectSize())
494 if (param.type->getQualifier() != EvqConstExpr)
496 if (param.type->isArray())
501 type->setQualifier(EvqConstExpr);
503 if (type->isArray() && type->getArraySize() != function.getParamCount()) {
504 error(line, "array constructor needs one argument per array element", "constructor");
508 if (arrayArg && op != EOpConstructStruct) {
509 error(line, "constructing from a non-dereferenced array", "constructor");
513 if (matrixInMatrix && !type->isArray()) {
514 if (function.getParamCount() != 1) {
515 error(line, "constructing matrix from matrix can only take one argument", "constructor");
521 error(line, "too many arguments", "constructor");
525 if (op == EOpConstructStruct && !type->isArray() && int(type->getStruct()->fields().size()) != function.getParamCount()) {
526 error(line, "Number of constructor parameters does not match the number of structure fields", "constructor");
530 if (!type->isMatrix() || !matrixInMatrix) {
531 if ((op != EOpConstructStruct && size != 1 && size < type->getObjectSize()) ||
532 (op == EOpConstructStruct && size < type->getObjectSize())) {
533 error(line, "not enough data provided for construction", "constructor");
538 TIntermTyped *typed = node ? node->getAsTyped() : 0;
540 error(line, "constructor argument does not have a type", "constructor");
543 if (op != EOpConstructStruct && IsSampler(typed->getBasicType())) {
544 error(line, "cannot convert a sampler", "constructor");
547 if (typed->getBasicType() == EbtVoid) {
548 error(line, "cannot convert a void", "constructor");
555 // This function checks to see if a void variable has been declared and raise an error message for such a case
557 // returns true in case of an error
559 bool TParseContext::voidErrorCheck(int line, const TString& identifier, const TPublicType& pubType)
561 if (pubType.type == EbtVoid) {
562 error(line, "illegal use of type 'void'", identifier.c_str());
569 // This function checks to see if the node (for the expression) contains a scalar boolean expression or not
571 // returns true in case of an error
573 bool TParseContext::boolErrorCheck(int line, const TIntermTyped* type)
575 if (type->getBasicType() != EbtBool || type->isArray() || type->isMatrix() || type->isVector()) {
576 error(line, "boolean expression expected", "");
583 // This function checks to see if the node (for the expression) contains a scalar boolean expression or not
585 // returns true in case of an error
587 bool TParseContext::boolErrorCheck(int line, const TPublicType& pType)
589 if (pType.type != EbtBool || pType.array || (pType.primarySize > 1) || (pType.secondarySize > 1)) {
590 error(line, "boolean expression expected", "");
597 bool TParseContext::samplerErrorCheck(int line, const TPublicType& pType, const char* reason)
599 if (pType.type == EbtStruct) {
600 if (containsSampler(*pType.userDef)) {
601 error(line, reason, getBasicString(pType.type), "(structure contains a sampler)");
607 } else if (IsSampler(pType.type)) {
608 error(line, reason, getBasicString(pType.type));
616 bool TParseContext::structQualifierErrorCheck(int line, const TPublicType& pType)
618 switch(pType.qualifier)
631 if(pType.type == EbtStruct)
633 error(line, "cannot be used with a structure", getQualifierString(pType.qualifier));
642 if (pType.qualifier != EvqUniform && samplerErrorCheck(line, pType, "samplers must be uniform"))
645 // check for layout qualifier issues
646 const TLayoutQualifier layoutQualifier = pType.layoutQualifier;
648 if (pType.qualifier != EvqVertexIn && pType.qualifier != EvqFragmentOut &&
649 layoutLocationErrorCheck(line, pType.layoutQualifier))
657 bool TParseContext::layoutLocationErrorCheck(const TSourceLoc &location, const TLayoutQualifier &layoutQualifier)
\r
659 if(layoutQualifier.location != -1)
\r
661 error(location, "invalid layout qualifier:", "location", "only valid on program inputs and outputs");
\r
668 bool TParseContext::parameterSamplerErrorCheck(int line, TQualifier qualifier, const TType& type)
670 if ((qualifier == EvqOut || qualifier == EvqInOut) &&
671 type.getBasicType() != EbtStruct && IsSampler(type.getBasicType())) {
672 error(line, "samplers cannot be output parameters", type.getBasicString());
679 bool TParseContext::containsSampler(TType& type)
681 if (IsSampler(type.getBasicType()))
684 if (type.getBasicType() == EbtStruct) {
685 const TFieldList& fields = type.getStruct()->fields();
686 for(unsigned int i = 0; i < fields.size(); ++i) {
687 if (containsSampler(*fields[i]->type()))
696 // Do size checking for an array type's size.
698 // Returns true if there was an error.
700 bool TParseContext::arraySizeErrorCheck(int line, TIntermTyped* expr, int& size)
702 TIntermConstantUnion* constant = expr->getAsConstantUnion();
704 if (constant == 0 || !constant->isScalarInt())
706 error(line, "array size must be a constant integer expression", "");
710 if (constant->getBasicType() == EbtUInt)
712 unsigned int uintSize = constant->getUConst(0);
713 if (uintSize > static_cast<unsigned int>(std::numeric_limits<int>::max()))
715 error(line, "array size too large", "");
720 size = static_cast<int>(uintSize);
724 size = constant->getIConst(0);
728 error(line, "array size must be a positive integer", "");
738 // See if this qualifier can be an array.
740 // Returns true if there is an error.
742 bool TParseContext::arrayQualifierErrorCheck(int line, TPublicType type)
744 if ((type.qualifier == EvqAttribute) || (type.qualifier == EvqVertexIn) || (type.qualifier == EvqConstExpr)) {
745 error(line, "cannot declare arrays of this qualifier", TType(type).getCompleteString().c_str());
753 // See if this type can be an array.
755 // Returns true if there is an error.
757 bool TParseContext::arrayTypeErrorCheck(int line, TPublicType type)
760 // Can the type be an array?
763 error(line, "cannot declare arrays of arrays", TType(type).getCompleteString().c_str());
771 // Do all the semantic checking for declaring an array, with and
772 // without a size, and make the right changes to the symbol table.
774 // size == 0 means no specified size.
776 // Returns true if there was an error.
778 bool TParseContext::arrayErrorCheck(int line, TString& identifier, TPublicType type, TVariable*& variable)
781 // Don't check for reserved word use until after we know it's not in the symbol table,
782 // because reserved arrays can be redeclared.
785 bool builtIn = false;
786 bool sameScope = false;
787 TSymbol* symbol = symbolTable.find(identifier, shaderVersion, &builtIn, &sameScope);
788 if (symbol == 0 || !sameScope) {
789 if (reservedErrorCheck(line, identifier))
792 variable = new TVariable(&identifier, TType(type));
795 variable->getType().setArraySize(type.arraySize);
797 if (! symbolTable.declare(*variable)) {
799 error(line, "INTERNAL ERROR inserting new symbol", identifier.c_str());
803 if (! symbol->isVariable()) {
804 error(line, "variable expected", identifier.c_str());
808 variable = static_cast<TVariable*>(symbol);
809 if (! variable->getType().isArray()) {
810 error(line, "redeclaring non-array as array", identifier.c_str());
813 if (variable->getType().getArraySize() > 0) {
814 error(line, "redeclaration of array with size", identifier.c_str());
818 if (! variable->getType().sameElementType(TType(type))) {
819 error(line, "redeclaration of array with a different type", identifier.c_str());
823 TType* t = variable->getArrayInformationType();
825 if (t->getMaxArraySize() > type.arraySize) {
826 error(line, "higher index value already used for the array", identifier.c_str());
829 t->setArraySize(type.arraySize);
830 t = t->getArrayInformationType();
834 variable->getType().setArraySize(type.arraySize);
837 if (voidErrorCheck(line, identifier, type))
843 bool TParseContext::arraySetMaxSize(TIntermSymbol *node, TType* type, int size, bool updateFlag, TSourceLoc line)
845 bool builtIn = false;
846 TSymbol* symbol = symbolTable.find(node->getSymbol(), shaderVersion, &builtIn);
848 error(line, " undeclared identifier", node->getSymbol().c_str());
851 TVariable* variable = static_cast<TVariable*>(symbol);
853 type->setArrayInformationType(variable->getArrayInformationType());
854 variable->updateArrayInformationType(type);
856 // special casing to test index value of gl_FragData. If the accessed index is >= gl_MaxDrawBuffers
858 if (node->getSymbol() == "gl_FragData") {
859 TSymbol* fragData = symbolTable.find("gl_MaxDrawBuffers", shaderVersion, &builtIn);
862 int fragDataValue = static_cast<TVariable*>(fragData)->getConstPointer()[0].getIConst();
863 if (fragDataValue <= size) {
864 error(line, "", "[", "gl_FragData can only have a max array size of up to gl_MaxDrawBuffers");
869 // we dont want to update the maxArraySize when this flag is not set, we just want to include this
870 // node type in the chain of node types so that its updated when a higher maxArraySize comes in.
875 variable->getType().setMaxArraySize(size);
876 type->setMaxArraySize(size);
879 while(tt->getArrayInformationType() != 0) {
880 tt = tt->getArrayInformationType();
881 tt->setMaxArraySize(size);
888 // Enforce non-initializer type/qualifier rules.
890 // Returns true if there was an error.
892 bool TParseContext::nonInitConstErrorCheck(int line, TString& identifier, TPublicType& type, bool array)
894 if (type.qualifier == EvqConstExpr)
896 // Make the qualifier make sense.
897 type.qualifier = EvqTemporary;
901 error(line, "arrays may not be declared constant since they cannot be initialized", identifier.c_str());
903 else if (type.isStructureContainingArrays())
905 error(line, "structures containing arrays may not be declared constant since they cannot be initialized", identifier.c_str());
909 error(line, "variables with qualifier 'const' must be initialized", identifier.c_str());
919 // Do semantic checking for a variable declaration that has no initializer,
920 // and update the symbol table.
922 // Returns true if there was an error.
924 bool TParseContext::nonInitErrorCheck(int line, TString& identifier, TPublicType& type, TVariable*& variable)
926 if (reservedErrorCheck(line, identifier))
929 variable = new TVariable(&identifier, TType(type));
931 if (! symbolTable.declare(*variable)) {
932 error(line, "redefinition", variable->getName().c_str());
938 if (voidErrorCheck(line, identifier, type))
944 bool TParseContext::paramErrorCheck(int line, TQualifier qualifier, TQualifier paramQualifier, TType* type)
946 if (qualifier != EvqConstReadOnly && qualifier != EvqTemporary) {
947 error(line, "qualifier not allowed on function parameter", getQualifierString(qualifier));
950 if (qualifier == EvqConstReadOnly && paramQualifier != EvqIn) {
951 error(line, "qualifier not allowed with ", getQualifierString(qualifier), getQualifierString(paramQualifier));
955 if (qualifier == EvqConstReadOnly)
956 type->setQualifier(EvqConstReadOnly);
958 type->setQualifier(paramQualifier);
963 bool TParseContext::extensionErrorCheck(int line, const TString& extension)
965 const TExtensionBehavior& extBehavior = extensionBehavior();
966 TExtensionBehavior::const_iterator iter = extBehavior.find(extension.c_str());
967 if (iter == extBehavior.end()) {
968 error(line, "extension", extension.c_str(), "is not supported");
971 // In GLSL ES, an extension's default behavior is "disable".
972 if (iter->second == EBhDisable || iter->second == EBhUndefined) {
973 error(line, "extension", extension.c_str(), "is disabled");
976 if (iter->second == EBhWarn) {
977 warning(line, "extension", extension.c_str(), "is being used");
984 bool TParseContext::supportsExtension(const char* extension)
986 const TExtensionBehavior& extbehavior = extensionBehavior();
987 TExtensionBehavior::const_iterator iter = extbehavior.find(extension);
988 return (iter != extbehavior.end());
991 void TParseContext::handleExtensionDirective(int line, const char* extName, const char* behavior)
993 pp::SourceLocation loc;
994 DecodeSourceLoc(line, &loc.file, &loc.line);
995 directiveHandler.handleExtension(loc, extName, behavior);
998 void TParseContext::handlePragmaDirective(int line, const char* name, const char* value)
1000 pp::SourceLocation loc;
1001 DecodeSourceLoc(line, &loc.file, &loc.line);
1002 directiveHandler.handlePragma(loc, name, value);
1005 /////////////////////////////////////////////////////////////////////////////////
1009 /////////////////////////////////////////////////////////////////////////////////
1012 // Look up a function name in the symbol table, and make sure it is a function.
1014 // Return the function symbol if found, otherwise 0.
1016 const TFunction* TParseContext::findFunction(int line, TFunction* call, bool *builtIn)
1018 // First find by unmangled name to check whether the function name has been
1019 // hidden by a variable name or struct typename.
1020 const TSymbol* symbol = symbolTable.find(call->getName(), shaderVersion, builtIn);
1022 symbol = symbolTable.find(call->getMangledName(), shaderVersion, builtIn);
1026 error(line, "no matching overloaded function found", call->getName().c_str());
1030 if (!symbol->isFunction()) {
1031 error(line, "function name expected", call->getName().c_str());
1035 return static_cast<const TFunction*>(symbol);
1039 // Initializers show up in several places in the grammar. Have one set of
1040 // code to handle them here.
1042 bool TParseContext::executeInitializer(TSourceLoc line, TString& identifier, TPublicType& pType,
1043 TIntermTyped* initializer, TIntermNode*& intermNode, TVariable* variable)
1045 TType type = TType(pType);
1047 if (variable == 0) {
1048 if (reservedErrorCheck(line, identifier))
1051 if (voidErrorCheck(line, identifier, pType))
1055 // add variable to symbol table
1057 variable = new TVariable(&identifier, type);
1058 if (! symbolTable.declare(*variable)) {
1059 error(line, "redefinition", variable->getName().c_str());
1061 // don't delete variable, it's used by error recovery, and the pool
1062 // pop will take care of the memory
1067 // identifier must be of type constant, a global, or a temporary
1069 TQualifier qualifier = variable->getType().getQualifier();
1070 if ((qualifier != EvqTemporary) && (qualifier != EvqGlobal) && (qualifier != EvqConstExpr)) {
1071 error(line, " cannot initialize this type of qualifier ", variable->getType().getQualifierString());
1075 // test for and propagate constant
1078 if (qualifier == EvqConstExpr) {
1079 if (qualifier != initializer->getType().getQualifier()) {
1080 std::stringstream extraInfoStream;
1081 extraInfoStream << "'" << variable->getType().getCompleteString() << "'";
1082 std::string extraInfo = extraInfoStream.str();
1083 error(line, " assigning non-constant to", "=", extraInfo.c_str());
1084 variable->getType().setQualifier(EvqTemporary);
1087 if (type != initializer->getType()) {
1088 error(line, " non-matching types for const initializer ",
1089 variable->getType().getQualifierString());
1090 variable->getType().setQualifier(EvqTemporary);
1093 if (initializer->getAsConstantUnion()) {
1094 ConstantUnion* unionArray = variable->getConstPointer();
1096 if (type.getObjectSize() == 1 && type.getBasicType() != EbtStruct) {
1097 *unionArray = (initializer->getAsConstantUnion()->getUnionArrayPointer())[0];
1099 variable->shareConstPointer(initializer->getAsConstantUnion()->getUnionArrayPointer());
1101 } else if (initializer->getAsSymbolNode()) {
1102 const TSymbol* symbol = symbolTable.find(initializer->getAsSymbolNode()->getSymbol(), shaderVersion);
1103 const TVariable* tVar = static_cast<const TVariable*>(symbol);
1105 ConstantUnion* constArray = tVar->getConstPointer();
1106 variable->shareConstPointer(constArray);
1108 std::stringstream extraInfoStream;
1109 extraInfoStream << "'" << variable->getType().getCompleteString() << "'";
1110 std::string extraInfo = extraInfoStream.str();
1111 error(line, " cannot assign to", "=", extraInfo.c_str());
1112 variable->getType().setQualifier(EvqTemporary);
1117 if (qualifier != EvqConstExpr) {
1118 TIntermSymbol* intermSymbol = intermediate.addSymbol(variable->getUniqueId(), variable->getName(), variable->getType(), line);
1119 intermNode = intermediate.addAssign(EOpInitialize, intermSymbol, initializer, line);
1120 if (intermNode == 0) {
1121 assignError(line, "=", intermSymbol->getCompleteString(), initializer->getCompleteString());
1130 bool TParseContext::areAllChildConst(TIntermAggregate* aggrNode)
1132 ASSERT(aggrNode != NULL);
1133 if (!aggrNode->isConstructor())
1136 bool allConstant = true;
1138 // check if all the child nodes are constants so that they can be inserted into
1140 TIntermSequence &sequence = aggrNode->getSequence() ;
1141 for (TIntermSequence::iterator p = sequence.begin(); p != sequence.end(); ++p) {
1142 if (!(*p)->getAsTyped()->getAsConstantUnion())
1149 TPublicType TParseContext::addFullySpecifiedType(TQualifier qualifier, bool invariant, TLayoutQualifier layoutQualifier, const TPublicType &typeSpecifier)
1151 TPublicType returnType = typeSpecifier;
1152 returnType.qualifier = qualifier;
1153 returnType.invariant = invariant;
1154 returnType.layoutQualifier = layoutQualifier;
1156 if(typeSpecifier.array)
1158 error(typeSpecifier.line, "not supported", "first-class array");
1160 returnType.clearArrayness();
1163 if(shaderVersion < 300)
1165 if(qualifier == EvqAttribute && (typeSpecifier.type == EbtBool || typeSpecifier.type == EbtInt))
1167 error(typeSpecifier.line, "cannot be bool or int", getQualifierString(qualifier));
1171 if((qualifier == EvqVaryingIn || qualifier == EvqVaryingOut) &&
1172 (typeSpecifier.type == EbtBool || typeSpecifier.type == EbtInt))
1174 error(typeSpecifier.line, "cannot be bool or int", getQualifierString(qualifier));
1186 case EvqCentroidOut:
1188 if(typeSpecifier.type == EbtBool)
1190 error(typeSpecifier.line, "cannot be bool", getQualifierString(qualifier));
1193 if(typeSpecifier.type == EbtInt || typeSpecifier.type == EbtUInt)
1195 error(typeSpecifier.line, "must use 'flat' interpolation here", getQualifierString(qualifier));
1201 case EvqFragmentOut:
1204 if(typeSpecifier.type == EbtBool)
1206 error(typeSpecifier.line, "cannot be bool", getQualifierString(qualifier));
1218 // This function is used to test for the correctness of the parameters passed to various constructor functions
1219 // and also convert them to the right datatype if it is allowed and required.
1221 // Returns 0 for an error or the constructed node (aggregate or typed) for no error.
1223 TIntermTyped* TParseContext::addConstructor(TIntermNode* arguments, const TType* type, TOperator op, TFunction* fnCall, TSourceLoc line)
1225 TIntermAggregate *aggregateArguments = arguments->getAsAggregate();
1227 if(!aggregateArguments)
1229 aggregateArguments = new TIntermAggregate;
1230 aggregateArguments->getSequence().push_back(arguments);
1233 if(op == EOpConstructStruct)
1235 const TFieldList &fields = type->getStruct()->fields();
1236 TIntermSequence &args = aggregateArguments->getSequence();
1238 for(size_t i = 0; i < fields.size(); i++)
1240 if(args[i]->getAsTyped()->getType() != *fields[i]->type())
1242 error(line, "Structure constructor arguments do not match structure fields", "Error");
1250 // Turn the argument list itself into a constructor
1251 TIntermTyped *constructor = intermediate.setAggregateOperator(aggregateArguments, op, line);
1252 TIntermTyped *constConstructor = foldConstConstructor(constructor->getAsAggregate(), *type);
1253 if(constConstructor)
1255 return constConstructor;
1261 TIntermTyped* TParseContext::foldConstConstructor(TIntermAggregate* aggrNode, const TType& type)
1263 bool canBeFolded = areAllChildConst(aggrNode);
1264 aggrNode->setType(type);
1266 bool returnVal = false;
1267 ConstantUnion* unionArray = new ConstantUnion[type.getObjectSize()];
1268 if (aggrNode->getSequence().size() == 1) {
1269 returnVal = intermediate.parseConstTree(aggrNode->getLine(), aggrNode, unionArray, aggrNode->getOp(), type, true);
1272 returnVal = intermediate.parseConstTree(aggrNode->getLine(), aggrNode, unionArray, aggrNode->getOp(), type);
1277 return intermediate.addConstantUnion(unionArray, type, aggrNode->getLine());
1284 // This function returns the tree representation for the vector field(s) being accessed from contant vector.
1285 // If only one component of vector is accessed (v.x or v[0] where v is a contant vector), then a contant node is
1286 // returned, else an aggregate node is returned (for v.xy). The input to this function could either be the symbol
1287 // node or it could be the intermediate tree representation of accessing fields in a constant structure or column of
1288 // a constant matrix.
1290 TIntermTyped* TParseContext::addConstVectorNode(TVectorFields& fields, TIntermTyped* node, TSourceLoc line)
1292 TIntermTyped* typedNode;
1293 TIntermConstantUnion* tempConstantNode = node->getAsConstantUnion();
1295 ConstantUnion *unionArray;
1296 if (tempConstantNode) {
1297 unionArray = tempConstantNode->getUnionArrayPointer();
1302 } else { // The node has to be either a symbol node or an aggregate node or a tempConstant node, else, its an error
1303 error(line, "Cannot offset into the vector", "Error");
1309 ConstantUnion* constArray = new ConstantUnion[fields.num];
1311 for (int i = 0; i < fields.num; i++) {
1312 if (fields.offsets[i] >= node->getType().getObjectSize()) {
1313 std::stringstream extraInfoStream;
1314 extraInfoStream << "vector field selection out of range '" << fields.offsets[i] << "'";
1315 std::string extraInfo = extraInfoStream.str();
1316 error(line, "", "[", extraInfo.c_str());
1318 fields.offsets[i] = 0;
1321 constArray[i] = unionArray[fields.offsets[i]];
1324 typedNode = intermediate.addConstantUnion(constArray, node->getType(), line);
1329 // This function returns the column being accessed from a constant matrix. The values are retrieved from
1330 // the symbol table and parse-tree is built for a vector (each column of a matrix is a vector). The input
1331 // to the function could either be a symbol node (m[0] where m is a constant matrix)that represents a
1332 // constant matrix or it could be the tree representation of the constant matrix (s.m1[0] where s is a constant structure)
1334 TIntermTyped* TParseContext::addConstMatrixNode(int index, TIntermTyped* node, TSourceLoc line)
1336 TIntermTyped* typedNode;
1337 TIntermConstantUnion* tempConstantNode = node->getAsConstantUnion();
1339 if (index >= node->getType().getNominalSize()) {
1340 std::stringstream extraInfoStream;
1341 extraInfoStream << "matrix field selection out of range '" << index << "'";
1342 std::string extraInfo = extraInfoStream.str();
1343 error(line, "", "[", extraInfo.c_str());
1348 if (tempConstantNode) {
1349 ConstantUnion* unionArray = tempConstantNode->getUnionArrayPointer();
1350 int size = tempConstantNode->getType().getNominalSize();
1351 typedNode = intermediate.addConstantUnion(&unionArray[size*index], tempConstantNode->getType(), line);
1353 error(line, "Cannot offset into the matrix", "Error");
1364 // This function returns an element of an array accessed from a constant array. The values are retrieved from
1365 // the symbol table and parse-tree is built for the type of the element. The input
1366 // to the function could either be a symbol node (a[0] where a is a constant array)that represents a
1367 // constant array or it could be the tree representation of the constant array (s.a1[0] where s is a constant structure)
1369 TIntermTyped* TParseContext::addConstArrayNode(int index, TIntermTyped* node, TSourceLoc line)
1371 TIntermTyped* typedNode;
1372 TIntermConstantUnion* tempConstantNode = node->getAsConstantUnion();
1373 TType arrayElementType = node->getType();
1374 arrayElementType.clearArrayness();
1376 if (index >= node->getType().getArraySize()) {
1377 std::stringstream extraInfoStream;
1378 extraInfoStream << "array field selection out of range '" << index << "'";
1379 std::string extraInfo = extraInfoStream.str();
1380 error(line, "", "[", extraInfo.c_str());
1385 int arrayElementSize = arrayElementType.getObjectSize();
1387 if (tempConstantNode) {
1388 ConstantUnion* unionArray = tempConstantNode->getUnionArrayPointer();
1389 typedNode = intermediate.addConstantUnion(&unionArray[arrayElementSize * index], tempConstantNode->getType(), line);
1391 error(line, "Cannot offset into the array", "Error");
1402 // This function returns the value of a particular field inside a constant structure from the symbol table.
1403 // If there is an embedded/nested struct, it appropriately calls addConstStructNested or addConstStructFromAggr
1404 // function and returns the parse-tree with the values of the embedded/nested struct.
1406 TIntermTyped* TParseContext::addConstStruct(TString& identifier, TIntermTyped* node, TSourceLoc line)
1408 const TFieldList &fields = node->getType().getStruct()->fields();
1409 TIntermTyped *typedNode;
1410 int instanceSize = 0;
1411 unsigned int index = 0;
1412 TIntermConstantUnion *tempConstantNode = node->getAsConstantUnion();
1414 for ( index = 0; index < fields.size(); ++index) {
1415 if (fields[index]->name() == identifier) {
1418 instanceSize += fields[index]->type()->getObjectSize();
1422 if (tempConstantNode) {
1423 ConstantUnion* constArray = tempConstantNode->getUnionArrayPointer();
1425 typedNode = intermediate.addConstantUnion(constArray+instanceSize, tempConstantNode->getType(), line); // type will be changed in the calling function
1427 error(line, "Cannot offset into the structure", "Error");
1436 TLayoutQualifier TParseContext::parseLayoutQualifier(const TString &qualifierType, const TSourceLoc& qualifierTypeLine)
1438 TLayoutQualifier qualifier;
1440 qualifier.location = -1;
1442 if (qualifierType == "location")
1444 error(qualifierTypeLine, "invalid layout qualifier", qualifierType.c_str(), "location requires an argument");
1449 error(qualifierTypeLine, "invalid layout qualifier", qualifierType.c_str());
1456 TLayoutQualifier TParseContext::parseLayoutQualifier(const TString &qualifierType, const TSourceLoc& qualifierTypeLine, const TString &intValueString, int intValue, const TSourceLoc& intValueLine)
1458 TLayoutQualifier qualifier;
1460 qualifier.location = -1;
1462 if (qualifierType != "location")
1464 error(qualifierTypeLine, "invalid layout qualifier", qualifierType.c_str(), "only location may have arguments");
1469 // must check that location is non-negative
1472 error(intValueLine, "out of range:", intValueString.c_str(), "location must be non-negative");
1477 qualifier.location = intValue;
1484 TLayoutQualifier TParseContext::joinLayoutQualifiers(TLayoutQualifier leftQualifier, TLayoutQualifier rightQualifier)
1486 TLayoutQualifier joinedQualifier = leftQualifier;
1488 if (rightQualifier.location != -1)
1490 joinedQualifier.location = rightQualifier.location;
1493 return joinedQualifier;
1497 TPublicType TParseContext::joinInterpolationQualifiers(const TSourceLoc &interpolationLoc, TQualifier interpolationQualifier,
1498 const TSourceLoc &storageLoc, TQualifier storageQualifier)
1500 TQualifier mergedQualifier = EvqSmoothIn;
1502 if(storageQualifier == EvqFragmentIn) {
1503 if(interpolationQualifier == EvqSmooth)
1504 mergedQualifier = EvqSmoothIn;
1505 else if(interpolationQualifier == EvqFlat)
1506 mergedQualifier = EvqFlatIn;
1509 else if(storageQualifier == EvqCentroidIn) {
1510 if(interpolationQualifier == EvqSmooth)
1511 mergedQualifier = EvqCentroidIn;
1512 else if(interpolationQualifier == EvqFlat)
1513 mergedQualifier = EvqFlatIn;
1516 else if(storageQualifier == EvqVertexOut) {
1517 if(interpolationQualifier == EvqSmooth)
1518 mergedQualifier = EvqSmoothOut;
1519 else if(interpolationQualifier == EvqFlat)
1520 mergedQualifier = EvqFlatOut;
1523 else if(storageQualifier == EvqCentroidOut) {
1524 if(interpolationQualifier == EvqSmooth)
1525 mergedQualifier = EvqCentroidOut;
1526 else if(interpolationQualifier == EvqFlat)
1527 mergedQualifier = EvqFlatOut;
1531 error(interpolationLoc, "interpolation qualifier requires a fragment 'in' or vertex 'out' storage qualifier", getQualifierString(interpolationQualifier));
1534 mergedQualifier = storageQualifier;
1538 type.setBasic(EbtVoid, mergedQualifier, storageLoc);
1542 bool TParseContext::enterStructDeclaration(int line, const TString& identifier)
1544 ++structNestingLevel;
1546 // Embedded structure definitions are not supported per GLSL ES spec.
1547 // They aren't allowed in GLSL either, but we need to detect this here
1548 // so we don't rely on the GLSL compiler to catch it.
1549 if (structNestingLevel > 1) {
1550 error(line, "", "Embedded struct definitions are not allowed");
1557 void TParseContext::exitStructDeclaration()
1559 --structNestingLevel;
1563 // Parse an array of strings using yyparse.
1565 // Returns 0 for success.
1567 int PaParseStrings(int count, const char* const string[], const int length[],
1568 TParseContext* context) {
1569 if ((count == 0) || (string == NULL))
1572 if (glslang_initialize(context))
1575 int error = glslang_scan(count, string, length, context);
1577 error = glslang_parse(context);
1579 glslang_finalize(context);
1581 return (error == 0) && (context->numErrors() == 0) ? 0 : 1;