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//===- ReduceMetadata.cpp - Specialized Delta Pass ------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements two functions used by the Generic Delta Debugging
// Algorithm, which are used to reduce Metadata nodes.
//
//===----------------------------------------------------------------------===//
#include "ReduceMetadata.h"
#include "Delta.h"
#include "llvm/ADT/Sequence.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/InstIterator.h"
#include <vector>
using namespace llvm;
/// Removes all the Named and Unnamed Metadata Nodes, as well as any debug
/// functions that aren't inside the desired Chunks.
static void extractMetadataFromModule(Oracle &O, Module &Program) {
// Get out-of-chunk Named metadata nodes
SmallVector<NamedMDNode *> NamedNodesToDelete;
for (NamedMDNode &MD : Program.named_metadata())
if (!O.shouldKeep())
NamedNodesToDelete.push_back(&MD);
for (NamedMDNode *NN : NamedNodesToDelete) {
for (auto I : seq<unsigned>(0, NN->getNumOperands()))
NN->setOperand(I, nullptr);
NN->eraseFromParent();
}
// Delete out-of-chunk metadata attached to globals.
for (GlobalVariable &GV : Program.globals()) {
SmallVector<std::pair<unsigned, MDNode *>> MDs;
GV.getAllMetadata(MDs);
for (std::pair<unsigned, MDNode *> &MD : MDs)
if (!O.shouldKeep())
GV.setMetadata(MD.first, nullptr);
}
for (Function &F : Program) {
{
SmallVector<std::pair<unsigned, MDNode *>> MDs;
// Delete out-of-chunk metadata attached to functions.
F.getAllMetadata(MDs);
for (std::pair<unsigned, MDNode *> &MD : MDs)
if (!O.shouldKeep())
F.setMetadata(MD.first, nullptr);
}
// Delete out-of-chunk metadata attached to instructions.
for (Instruction &I : instructions(F)) {
SmallVector<std::pair<unsigned, MDNode *>> MDs;
I.getAllMetadata(MDs);
for (std::pair<unsigned, MDNode *> &MD : MDs)
if (!O.shouldKeep())
I.setMetadata(MD.first, nullptr);
}
}
}
void llvm::reduceMetadataDeltaPass(TestRunner &Test) {
outs() << "*** Reducing Metadata...\n";
runDeltaPass(Test, extractMetadataFromModule);
outs() << "----------------------------\n";
}
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