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/*
* Copyright 2013, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "strip_unknown_attributes.h"
namespace slang {
StripUnknownAttributes::StripUnknownAttributes() : ModulePass(ID) {
}
bool StripUnknownAttributes::runOnFunction(llvm::Function &F) {
bool changed = false;
for (llvm::Function::arg_iterator I = F.arg_begin(), E = F.arg_end();
I != E; ++I) {
llvm::Argument &A = *I;
// Remove any readnone/readonly attributes from function parameters.
if (A.onlyReadsMemory()) {
llvm::AttrBuilder B;
B.addAttribute(llvm::Attribute::ReadNone);
B.addAttribute(llvm::Attribute::ReadOnly);
llvm::AttributeSet ToStrip = llvm::AttributeSet::get(F.getContext(),
A.getArgNo() + 1, B);
A.removeAttr(ToStrip);
changed = true;
}
}
return changed;
}
bool StripUnknownAttributes::runOnModule(llvm::Module &M) {
bool Changed = false;
for (llvm::Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
Changed |= runOnFunction(*I);
}
return Changed;
}
llvm::ModulePass * createStripUnknownAttributesPass() {
return new StripUnknownAttributes();
}
char StripUnknownAttributes::ID = 0;
static llvm::RegisterPass<StripUnknownAttributes> RPSUA(
"StripUnknownAttributes", "Strip Unknown Attributes Pass");
} // namespace slang
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