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