1 /* 2 * Copyright 2017, 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 "strip_unknown_attributes.h" 18 19 #include "llvm/IR/Function.h" 20 21 namespace slang { 22 stripUnknownAttributes(llvm::Function & F)23bool stripUnknownAttributes(llvm::Function &F) { 24 bool changed = false; 25 for (llvm::Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); 26 I != E; ++I) { 27 llvm::Argument &A = *I; 28 // Remove any readnone/readonly attributes from function parameters. 29 if (A.onlyReadsMemory()) { 30 llvm::AttrBuilder B; 31 B.addAttribute(llvm::Attribute::ReadNone); 32 B.addAttribute(llvm::Attribute::ReadOnly); 33 llvm::AttributeSet ToStrip = llvm::AttributeSet::get(F.getContext(), 34 A.getArgNo() + 1, B); 35 A.removeAttr(ToStrip); 36 changed = true; 37 } 38 } 39 F.removeFnAttr(llvm::Attribute::ArgMemOnly); 40 return changed; 41 } 42 43 } // namespace slang 44