| //===- MachineStripDebug.cpp - Strip debug info ---------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| /// |
| /// \file This removes debug info from everything. It can be used to ensure |
| /// tests can be debugified without affecting the output MIR. |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineModuleInfo.h" |
| #include "llvm/CodeGen/Passes.h" |
| #include "llvm/IR/DebugInfo.h" |
| #include "llvm/InitializePasses.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Transforms/Utils/Debugify.h" |
| |
| #define DEBUG_TYPE "mir-strip-debug" |
| |
| using namespace llvm; |
| |
| namespace { |
| cl::opt<bool> |
| OnlyDebugifiedDefault("mir-strip-debugify-only", |
| cl::desc("Should mir-strip-debug only strip debug " |
| "info from debugified modules by default"), |
| cl::init(true)); |
| |
| struct StripDebugMachineModule : public ModulePass { |
| bool runOnModule(Module &M) override { |
| if (OnlyDebugified) { |
| NamedMDNode *DebugifyMD = M.getNamedMetadata("llvm.debugify"); |
| if (!DebugifyMD) { |
| LLVM_DEBUG(dbgs() << "Not stripping debug info" |
| " (debugify metadata not found)?\n"); |
| return false; |
| } |
| } |
| |
| MachineModuleInfo &MMI = |
| getAnalysis<MachineModuleInfoWrapperPass>().getMMI(); |
| |
| bool Changed = false; |
| for (Function &F : M.functions()) { |
| MachineFunction *MaybeMF = MMI.getMachineFunction(F); |
| if (!MaybeMF) |
| continue; |
| MachineFunction &MF = *MaybeMF; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : llvm::make_early_inc_range(MBB)) { |
| if (MI.isDebugInstr()) { |
| // FIXME: We should remove all of them. However, AArch64 emits an |
| // invalid `DBG_VALUE $lr` with only one operand instead of |
| // the usual three and has a test that depends on it's |
| // preservation. Preserve it for now. |
| if (MI.getNumOperands() > 1) { |
| LLVM_DEBUG(dbgs() << "Removing debug instruction " << MI); |
| MBB.erase(&MI); |
| Changed |= true; |
| continue; |
| } |
| } |
| if (MI.getDebugLoc()) { |
| LLVM_DEBUG(dbgs() << "Removing location " << MI); |
| MI.setDebugLoc(DebugLoc()); |
| Changed |= true; |
| continue; |
| } |
| LLVM_DEBUG(dbgs() << "Keeping " << MI); |
| } |
| } |
| } |
| |
| Changed |= stripDebugifyMetadata(M); |
| |
| return Changed; |
| } |
| |
| StripDebugMachineModule() : StripDebugMachineModule(OnlyDebugifiedDefault) {} |
| StripDebugMachineModule(bool OnlyDebugified) |
| : ModulePass(ID), OnlyDebugified(OnlyDebugified) {} |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const override { |
| AU.addRequired<MachineModuleInfoWrapperPass>(); |
| AU.addPreserved<MachineModuleInfoWrapperPass>(); |
| AU.setPreservesCFG(); |
| } |
| |
| static char ID; // Pass identification. |
| |
| protected: |
| bool OnlyDebugified; |
| }; |
| char StripDebugMachineModule::ID = 0; |
| |
| } // end anonymous namespace |
| |
| INITIALIZE_PASS_BEGIN(StripDebugMachineModule, DEBUG_TYPE, |
| "Machine Strip Debug Module", false, false) |
| INITIALIZE_PASS_END(StripDebugMachineModule, DEBUG_TYPE, |
| "Machine Strip Debug Module", false, false) |
| |
| ModulePass *llvm::createStripDebugMachineModulePass(bool OnlyDebugified) { |
| return new StripDebugMachineModule(OnlyDebugified); |
| } |