diff options
Diffstat (limited to '3rdparty/bgfx/3rdparty/glslang/glslang/MachineIndependent/limits.cpp')
-rw-r--r-- | 3rdparty/bgfx/3rdparty/glslang/glslang/MachineIndependent/limits.cpp | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/3rdparty/bgfx/3rdparty/glslang/glslang/MachineIndependent/limits.cpp b/3rdparty/bgfx/3rdparty/glslang/glslang/MachineIndependent/limits.cpp new file mode 100644 index 00000000000..49da930110d --- /dev/null +++ b/3rdparty/bgfx/3rdparty/glslang/glslang/MachineIndependent/limits.cpp @@ -0,0 +1,198 @@ +// +//Copyright (C) 2013 LunarG, Inc. +// +//All rights reserved. +// +//Redistribution and use in source and binary forms, with or without +//modification, are permitted provided that the following conditions +//are met: +// +// Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// +// Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following +// disclaimer in the documentation and/or other materials provided +// with the distribution. +// +// Neither the name of 3Dlabs Inc. Ltd. nor the names of its +// contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +//"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +//LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +//FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +//COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +//INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +//BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +//LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +//CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +//LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +//ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +//POSSIBILITY OF SUCH DAMAGE. +// + +// +// Do sub tree walks for +// 1) inductive loop bodies to see if the inductive variable is modified +// 2) array-index expressions to see if they are "constant-index-expression" +// +// These are per Appendix A of ES 2.0: +// +// "Within the body of the loop, the loop index is not statically assigned to nor is it used as the +// argument to a function out or inout parameter." +// +// "The following are constant-index-expressions: +// - Constant expressions +// - Loop indices as defined in section 4 +// - Expressions composed of both of the above" +// +// N.B.: assuming the last rule excludes function calls +// + +#include "ParseHelper.h" + +namespace glslang { + +// +// The inductive loop-body traverser. +// +// Just look at things that might modify the loop index. +// + +class TInductiveTraverser : public TIntermTraverser { +public: + TInductiveTraverser(int id, TSymbolTable& st) + : loopId(id), symbolTable(st), bad(false) { } + + virtual bool visitBinary(TVisit, TIntermBinary* node); + virtual bool visitUnary(TVisit, TIntermUnary* node); + virtual bool visitAggregate(TVisit, TIntermAggregate* node); + + int loopId; // unique ID of the symbol that's the loop inductive variable + TSymbolTable& symbolTable; + bool bad; + TSourceLoc badLoc; + +protected: + TInductiveTraverser(TInductiveTraverser&); + TInductiveTraverser& operator=(TInductiveTraverser&); +}; + +// check binary operations for those modifying the loop index +bool TInductiveTraverser::visitBinary(TVisit /* visit */, TIntermBinary* node) +{ + if (node->modifiesState() && node->getLeft()->getAsSymbolNode() && + node->getLeft()->getAsSymbolNode()->getId() == loopId) { + bad = true; + badLoc = node->getLoc(); + } + + return true; +} + +// check unary operations for those modifying the loop index +bool TInductiveTraverser::visitUnary(TVisit /* visit */, TIntermUnary* node) +{ + if (node->modifiesState() && node->getOperand()->getAsSymbolNode() && + node->getOperand()->getAsSymbolNode()->getId() == loopId) { + bad = true; + badLoc = node->getLoc(); + } + + return true; +} + +// check function calls for arguments modifying the loop index +bool TInductiveTraverser::visitAggregate(TVisit /* visit */, TIntermAggregate* node) +{ + if (node->getOp() == EOpFunctionCall) { + // see if an out or inout argument is the loop index + const TIntermSequence& args = node->getSequence(); + for (int i = 0; i < (int)args.size(); ++i) { + if (args[i]->getAsSymbolNode() && args[i]->getAsSymbolNode()->getId() == loopId) { + TSymbol* function = symbolTable.find(node->getName()); + const TType* type = (*function->getAsFunction())[i].type; + if (type->getQualifier().storage == EvqOut || + type->getQualifier().storage == EvqInOut) { + bad = true; + badLoc = node->getLoc(); + } + } + } + } + + return true; +} + +// +// External function to call for loop check. +// +void TParseContext::inductiveLoopBodyCheck(TIntermNode* body, int loopId, TSymbolTable& symbolTable) +{ + TInductiveTraverser it(loopId, symbolTable); + + if (body == nullptr) + return; + + body->traverse(&it); + + if (it.bad) + error(it.badLoc, "inductive loop index modified", "limitations", ""); +} + +// +// The "constant-index-expression" tranverser. +// +// Just look at things that can form an index. +// + +class TIndexTraverser : public TIntermTraverser { +public: + TIndexTraverser(const TIdSetType& ids) : inductiveLoopIds(ids), bad(false) { } + virtual void visitSymbol(TIntermSymbol* symbol); + virtual bool visitAggregate(TVisit, TIntermAggregate* node); + const TIdSetType& inductiveLoopIds; + bool bad; + TSourceLoc badLoc; + +protected: + TIndexTraverser(TIndexTraverser&); + TIndexTraverser& operator=(TIndexTraverser&); +}; + +// make sure symbols are inductive-loop indexes +void TIndexTraverser::visitSymbol(TIntermSymbol* symbol) +{ + if (inductiveLoopIds.find(symbol->getId()) == inductiveLoopIds.end()) { + bad = true; + badLoc = symbol->getLoc(); + } +} + +// check for function calls, assuming they are bad; spec. doesn't really say +bool TIndexTraverser::visitAggregate(TVisit /* visit */, TIntermAggregate* node) +{ + if (node->getOp() == EOpFunctionCall) { + bad = true; + badLoc = node->getLoc(); + } + + return true; +} + +// +// External function to call for loop check. +// +void TParseContext::constantIndexExpressionCheck(TIntermNode* index) +{ + TIndexTraverser it(inductiveLoopIds); + + index->traverse(&it); + + if (it.bad) + error(it.badLoc, "Non-constant-index-expression", "limitations", ""); +} + +} // end namespace glslang |