1/* 2 * Copyright 2013, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "llvm/IR/Module.h" 18#include "llvm/Pass.h" 19 20namespace slang { 21 22// Remove any readnone/readonly attributes from function parameters, 23// and remove any argmemonly attributes from functions. 24// 25// Jellybean's LLVM version didn't support readnone/readonly as anything 26// other than function attributes, so it will fail verification otherwise. 27// Since we never ran the verifier in Jellybean, it ends up with potential 28// crashes deeper in CodeGen. 29// 30// Similarly, older LLVM versions don't support argmemonly as a function 31// attribute, and so it can trigger an llvm_unreachable assertion when 32// we attempt to write out bitcode. 33class StripUnknownAttributes : public llvm::ModulePass { 34public: 35 static char ID; 36 37 StripUnknownAttributes(); 38 39 bool runOnFunction(llvm::Function &F); 40 41 // We have to use a ModulePass, since a FunctionPass only gets run on 42 // defined Functions (and not declared Functions). 43 virtual bool runOnModule(llvm::Module &M); 44}; 45 46llvm::ModulePass * createStripUnknownAttributesPass(); 47 48} // namespace slang 49