123 lines
4 KiB
C++
123 lines
4 KiB
C++
//===- ReduceMetadata.cpp - Specialized Delta Pass ------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements two functions used by the Generic Delta Debugging
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// Algorithm, which are used to reduce Metadata nodes.
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceMetadata.h"
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#include "Delta.h"
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#include "llvm/ADT/Sequence.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/IntrinsicInst.h"
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using namespace llvm;
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static bool shouldKeepDebugIntrinsicMetadata(Instruction &I, MDNode &MD) {
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return isa<DILocation>(MD) && isa<DbgInfoIntrinsic>(I);
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}
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static bool shouldKeepDebugNamedMetadata(NamedMDNode &MD) {
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return MD.getName() == "llvm.dbg.cu" && MD.getNumOperands() != 0;
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}
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// Named metadata with simple list-like behavior, so that it's valid to remove
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// operands individually.
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static constexpr StringLiteral ListNamedMetadata[] = {
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"llvm.module.flags",
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"llvm.ident",
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"opencl.spir.version",
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"opencl.ocl.version",
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"opencl.used.extensions",
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"opencl.used.optional.core.features",
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"opencl.compiler.options"
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};
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/// Remove unneeded arguments to named metadata.
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static void reduceNamedMetadataOperands(Oracle &O, ReducerWorkItem &WorkItem) {
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Module &M = WorkItem.getModule();
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for (StringRef MDName : ListNamedMetadata) {
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NamedMDNode *NamedNode = M.getNamedMetadata(MDName);
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if (!NamedNode)
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continue;
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bool MadeChange = false;
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SmallVector<MDNode *, 16> KeptOperands;
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for (auto I : seq<unsigned>(0, NamedNode->getNumOperands())) {
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if (O.shouldKeep())
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KeptOperands.push_back(NamedNode->getOperand(I));
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else
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MadeChange = true;
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}
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if (MadeChange) {
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NamedNode->clearOperands();
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for (MDNode *KeptOperand : KeptOperands)
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NamedNode->addOperand(KeptOperand);
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}
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}
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}
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/// Removes all the Named and Unnamed Metadata Nodes, as well as any debug
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/// functions that aren't inside the desired Chunks.
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static void extractMetadataFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
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Module &Program = WorkItem.getModule();
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// Get out-of-chunk Named metadata nodes
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SmallVector<NamedMDNode *> NamedNodesToDelete;
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for (NamedMDNode &MD : Program.named_metadata())
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if (!shouldKeepDebugNamedMetadata(MD) && !O.shouldKeep())
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NamedNodesToDelete.push_back(&MD);
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for (NamedMDNode *NN : NamedNodesToDelete) {
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for (auto I : seq<unsigned>(0, NN->getNumOperands()))
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NN->setOperand(I, nullptr);
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NN->eraseFromParent();
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}
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// Delete out-of-chunk metadata attached to globals.
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for (GlobalVariable &GV : Program.globals()) {
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SmallVector<std::pair<unsigned, MDNode *>> MDs;
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GV.getAllMetadata(MDs);
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for (std::pair<unsigned, MDNode *> &MD : MDs)
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if (!O.shouldKeep())
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GV.setMetadata(MD.first, nullptr);
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}
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for (Function &F : Program) {
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{
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SmallVector<std::pair<unsigned, MDNode *>> MDs;
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// Delete out-of-chunk metadata attached to functions.
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F.getAllMetadata(MDs);
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for (std::pair<unsigned, MDNode *> &MD : MDs)
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if (!O.shouldKeep())
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F.setMetadata(MD.first, nullptr);
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}
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// Delete out-of-chunk metadata attached to instructions.
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for (Instruction &I : instructions(F)) {
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SmallVector<std::pair<unsigned, MDNode *>> MDs;
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I.getAllMetadata(MDs);
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for (std::pair<unsigned, MDNode *> &MD : MDs) {
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if (!shouldKeepDebugIntrinsicMetadata(I, *MD.second) && !O.shouldKeep())
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I.setMetadata(MD.first, nullptr);
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}
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}
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}
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}
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void llvm::reduceMetadataDeltaPass(TestRunner &Test) {
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runDeltaPass(Test, extractMetadataFromModule, "Reducing Metadata");
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}
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void llvm::reduceNamedMetadataDeltaPass(TestRunner &Test) {
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runDeltaPass(Test, reduceNamedMetadataOperands, "Reducing Named Metadata");
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}
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