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7ce08bafea
Add mir-check-debug pass to check MIR-level debug info. For IR-level, currently, LLVM have debugify + check-debugify to generate and check debug IR. Much like the IR-level pass debugify, mir-debugify inserts sequentially increasing line locations to each MachineInstr in a Module, But there is no equivalent MIR-level check-debugify pass, So now we support it at "mir-check-debug". Reviewed By: djtodoro Differential Revision: https://reviews.llvm.org/D91595
127 lines
4.1 KiB
C++
127 lines
4.1 KiB
C++
//===- MachineCheckDebugify.cpp - Check 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 checks debug info after mir-debugify (+ pass-to-test). Currently
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/// it simply checks the integrity of line info in DILocation and
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/// DILocalVariable which mir-debugifiy generated before.
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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-check-debugify"
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using namespace llvm;
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namespace {
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struct CheckDebugMachineModule : 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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NamedMDNode *NMD = M.getNamedMetadata("llvm.mir.debugify");
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if (!NMD) {
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errs() << "WARNING: Please run mir-debugify to generate "
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"llvm.mir.debugify metadata first.\n";
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return false;
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}
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auto getDebugifyOperand = [&](unsigned Idx) -> unsigned {
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return mdconst::extract<ConstantInt>(NMD->getOperand(Idx)->getOperand(0))
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->getZExtValue();
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};
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assert(NMD->getNumOperands() == 2 &&
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"llvm.mir.debugify should have exactly 2 operands!");
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unsigned NumLines = getDebugifyOperand(0);
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unsigned NumVars = getDebugifyOperand(1);
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BitVector MissingLines{NumLines, true};
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BitVector MissingVars{NumVars, true};
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for (Function &F : M.functions()) {
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MachineFunction *MF = MMI.getMachineFunction(F);
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if (!MF)
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continue;
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for (MachineBasicBlock &MBB : *MF) {
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// Find missing lines.
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// TODO: Avoid meta instructions other than dbg_val.
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for (MachineInstr &MI : MBB) {
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if (MI.isDebugValue())
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continue;
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const DebugLoc DL = MI.getDebugLoc();
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if (DL && DL.getLine() != 0) {
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MissingLines.reset(DL.getLine() - 1);
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continue;
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}
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if (!DL) {
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errs() << "WARNING: Instruction with empty DebugLoc in function ";
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errs() << F.getName() << " --";
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MI.print(errs());
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}
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}
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// Find missing variables.
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// TODO: Handle DBG_INSTR_REF which is under an experimental option now.
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for (MachineInstr &MI : MBB) {
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if (!MI.isDebugValue())
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continue;
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const DILocalVariable *LocalVar = MI.getDebugVariable();
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unsigned Var = ~0U;
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(void)to_integer(LocalVar->getName(), Var, 10);
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assert(Var <= NumVars && "Unexpected name for DILocalVariable");
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MissingVars.reset(Var - 1);
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}
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}
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}
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bool Fail = false;
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for (unsigned Idx : MissingLines.set_bits()) {
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errs() << "WARNING: Missing line " << Idx + 1 << "\n";
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Fail = true;
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}
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for (unsigned Idx : MissingVars.set_bits()) {
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errs() << "WARNING: Missing variable " << Idx + 1 << "\n";
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Fail = true;
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}
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errs() << "Machine IR debug info check: ";
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errs() << (Fail ? "FAIL" : "PASS") << "\n";
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return false;
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}
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CheckDebugMachineModule() : 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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AU.setPreservesCFG();
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}
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static char ID; // Pass identification.
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};
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char CheckDebugMachineModule::ID = 0;
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} // end anonymous namespace
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INITIALIZE_PASS_BEGIN(CheckDebugMachineModule, DEBUG_TYPE,
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"Machine Check Debug Module", false, false)
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INITIALIZE_PASS_END(CheckDebugMachineModule, DEBUG_TYPE,
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"Machine Check Debug Module", false, false)
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ModulePass *llvm::createCheckDebugMachineModulePass() {
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return new CheckDebugMachineModule();
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}
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