1 // Copyright 2016 The SwiftShader Authors. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "Compiler.h" 16 #include "intermediate.h" 17 18 class TInfoSinkBase; 19 20 struct TLoopInfo { 21 struct TIndex { 22 int id; // symbol id. 23 } index; 24 TIntermLoop* loop; 25 }; 26 typedef TVector<TLoopInfo> TLoopStack; 27 28 // Traverses intermediate tree to ensure that the shader does not exceed the 29 // minimum functionality mandated in GLSL 1.0 spec, Appendix A. 30 class ValidateLimitations : public TIntermTraverser { 31 public: 32 ValidateLimitations(GLenum shaderType, TInfoSinkBase& sink); 33 numErrors()34 int numErrors() const { return mNumErrors; } 35 36 virtual bool visitBinary(Visit, TIntermBinary*); 37 virtual bool visitUnary(Visit, TIntermUnary*); 38 virtual bool visitAggregate(Visit, TIntermAggregate*); 39 virtual bool visitLoop(Visit, TIntermLoop*); 40 41 private: 42 void error(TSourceLoc loc, const char *reason, const char* token); 43 44 bool withinLoopBody() const; 45 bool isLoopIndex(const TIntermSymbol* symbol) const; 46 bool validateLoopType(TIntermLoop* node); 47 bool validateForLoopHeader(TIntermLoop* node, TLoopInfo* info); 48 bool validateForLoopInit(TIntermLoop* node, TLoopInfo* info); 49 bool validateForLoopCond(TIntermLoop* node, TLoopInfo* info); 50 bool validateForLoopExpr(TIntermLoop* node, TLoopInfo* info); 51 // Returns true if none of the loop indices is used as the argument to 52 // the given function out or inout parameter. 53 bool validateFunctionCall(TIntermAggregate* node); 54 bool validateOperation(TIntermOperator* node, TIntermNode* operand); 55 56 // Returns true if indexing does not exceed the minimum functionality 57 // mandated in GLSL 1.0 spec, Appendix A, Section 5. 58 bool isConstExpr(TIntermNode* node); 59 bool isConstIndexExpr(TIntermNode* node); 60 bool validateIndexing(TIntermBinary* node); 61 62 GLenum mShaderType; 63 TInfoSinkBase& mSink; 64 int mNumErrors; 65 TLoopStack mLoopStack; 66 }; 67 68