Stephen Hines | 552d872 | 2013-12-18 12:21:50 -0800 | [diff] [blame] | 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 "strip_unknown_attributes.h" |
| 18 | |
| 19 | namespace slang { |
| 20 | |
| 21 | StripUnknownAttributes::StripUnknownAttributes() : ModulePass(ID) { |
| 22 | } |
| 23 | |
| 24 | |
| 25 | bool StripUnknownAttributes::runOnFunction(llvm::Function &F) { |
| 26 | bool changed = false; |
| 27 | for (llvm::Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); |
| 28 | I != E; ++I) { |
| 29 | llvm::Argument &A = *I; |
| 30 | // Remove any readnone/readonly attributes from function parameters. |
| 31 | if (A.onlyReadsMemory()) { |
| 32 | llvm::AttrBuilder B; |
| 33 | B.addAttribute(llvm::Attribute::ReadNone); |
| 34 | B.addAttribute(llvm::Attribute::ReadOnly); |
| 35 | llvm::AttributeSet ToStrip = llvm::AttributeSet::get(F.getContext(), |
| 36 | A.getArgNo() + 1, B); |
| 37 | A.removeAttr(ToStrip); |
| 38 | changed = true; |
| 39 | } |
| 40 | } |
| 41 | return changed; |
| 42 | } |
| 43 | |
| 44 | |
| 45 | bool StripUnknownAttributes::runOnModule(llvm::Module &M) { |
| 46 | bool Changed = false; |
| 47 | for (llvm::Module::iterator I = M.begin(), E = M.end(); I != E; ++I) { |
| 48 | Changed |= runOnFunction(*I); |
| 49 | } |
| 50 | return Changed; |
| 51 | } |
| 52 | |
| 53 | |
| 54 | llvm::ModulePass * createStripUnknownAttributesPass() { |
| 55 | return new StripUnknownAttributes(); |
| 56 | } |
| 57 | |
| 58 | |
| 59 | char StripUnknownAttributes::ID = 0; |
| 60 | static llvm::RegisterPass<StripUnknownAttributes> RPSUA( |
| 61 | "StripUnknownAttributes", "Strip Unknown Attributes Pass"); |
| 62 | |
| 63 | } // namespace slang |