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