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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 "llvm/IR/IntrinsicInst.h"
using namespace llvm;
extern cl::OptionCategory LLVMReduceOptions;
static cl::opt<bool> AggressiveMetadataReduction(
"aggressive-named-md-reduction",
cl::desc("Reduce named metadata without taking its type into account"),
cl::cat(LLVMReduceOptions));
static bool shouldKeepDebugIntrinsicMetadata(Instruction &I, MDNode &MD) {
return isa<DILocation>(MD) && isa<DbgInfoIntrinsic>(I);
}
static bool shouldKeepDebugNamedMetadata(NamedMDNode &MD) {
return MD.getName() == "llvm.dbg.cu" && MD.getNumOperands() != 0;
}
// Named metadata with simple list-like behavior, so that it's valid to remove
// operands individually.
static constexpr StringLiteral ListNamedMetadata[] = {
"llvm.module.flags",
"llvm.ident",
"opencl.spir.version",
"opencl.ocl.version",
"opencl.used.extensions",
"opencl.used.optional.core.features",
"opencl.compiler.options"
};
/// Remove unneeded arguments to named metadata.
static void reduceNamedMetadataOperands(Oracle &O, ReducerWorkItem &WorkItem) {
Module &M = WorkItem.getModule();
for (NamedMDNode &I : M.named_metadata()) {
// If we don't want to reduce mindlessly, check if our node is part of
// ListNamedMetadata before reducing it
if (!AggressiveMetadataReduction &&
!is_contained(ListNamedMetadata, I.getName()))
continue;
bool MadeChange = false;
SmallVector<MDNode *> KeptOperands;
for (auto J : seq<unsigned>(0, I.getNumOperands())) {
if (O.shouldKeep())
KeptOperands.push_back(I.getOperand(J));
else
MadeChange = true;
}
if (MadeChange) {
I.clearOperands();
for (MDNode *KeptOperand : KeptOperands)
I.addOperand(KeptOperand);
}
}
}
/// 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, ReducerWorkItem &WorkItem) {
Module &Program = WorkItem.getModule();
// Get out-of-chunk Named metadata nodes
SmallVector<NamedMDNode *> NamedNodesToDelete;
for (NamedMDNode &MD : Program.named_metadata())
if (!shouldKeepDebugNamedMetadata(MD) && !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 (!shouldKeepDebugIntrinsicMetadata(I, *MD.second) && !O.shouldKeep())
I.setMetadata(MD.first, nullptr);
}
}
}
}
void llvm::reduceMetadataDeltaPass(TestRunner &Test) {
runDeltaPass(Test, extractMetadataFromModule, "Reducing Metadata");
}
void llvm::reduceNamedMetadataDeltaPass(TestRunner &Test) {
runDeltaPass(Test, reduceNamedMetadataOperands, "Reducing Named Metadata");
}
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