a79b2fc44b
Summary: Removes: * All LLVM-IR level debug info using StripDebugInfo() * All debugify metadata * 'Debug Info Version' module flag * All (valid*) DEBUG_VALUE MachineInstrs * All DebugLocs from MachineInstrs This is a more complete solution than the previous MIRPrinter option that just causes it to neglect to print debug-locations. * The qualifier 'valid' is used here because AArch64 emits an invalid one and tests depend on it Reviewers: vsk, aprantl, bogner Subscribers: mgorny, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D77747
113 lines
3.6 KiB
C++
113 lines
3.6 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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#define DEBUG_TYPE "mir-strip-debug"
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using namespace llvm;
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namespace {
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struct StripDebugMachineModule : public ModulePass {
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bool runOnModule(Module &M) override {
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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 &MF = MMI.getOrCreateMachineFunction(F);
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for (MachineBasicBlock &MBB : MF) {
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for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
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I != E;) {
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if (I->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 (I->getNumOperands() > 1) {
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LLVM_DEBUG(dbgs() << "Removing debug instruction " << *I);
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I = MBB.erase(I);
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Changed |= true;
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continue;
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}
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}
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if (I->getDebugLoc()) {
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LLVM_DEBUG(dbgs() << "Removing location " << *I);
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I->setDebugLoc(DebugLoc());
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Changed |= true;
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++I;
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continue;
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}
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LLVM_DEBUG(dbgs() << "Keeping " << *I);
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++I;
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}
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}
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}
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Changed |= StripDebugInfo(M);
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NamedMDNode *NMD = M.getNamedMetadata("llvm.debugify");
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if (NMD) {
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NMD->eraseFromParent();
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Changed |= true;
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}
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NMD = M.getModuleFlagsMetadata();
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if (NMD) {
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// There must be an easier way to remove an operand from a NamedMDNode.
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SmallVector<MDNode *, 4> Flags;
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for (MDNode *Flag : NMD->operands())
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Flags.push_back(Flag);
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NMD->clearOperands();
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for (MDNode *Flag : Flags) {
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MDString *Key = dyn_cast_or_null<MDString>(Flag->getOperand(1));
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if (Key->getString() == "Debug Info Version") {
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Changed |= true;
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continue;
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}
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NMD->addOperand(Flag);
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}
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// If we left it empty we might as well remove it.
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if (NMD->getNumOperands() == 0)
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NMD->eraseFromParent();
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}
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return Changed;
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}
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StripDebugMachineModule() : ModulePass(ID) {}
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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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}
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static char ID; // Pass identification.
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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 *createStripDebugMachineModulePass() {
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return new StripDebugMachineModule();
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}
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