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//===- MachineDebugify.cpp - Attach synthetic debug info to everything ----===//
//
// 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 pass attaches synthetic debug info to everything. It can be used
/// to create targeted tests for debug info preservation.
///
/// This isn't intended to have feature parity with Debugify.
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/InitializePasses.h"
#include "llvm/Transforms/Utils/Debugify.h"
#define DEBUG_TYPE "mir-debugify"
using namespace llvm;
namespace {
bool applyDebugifyMetadataToMachineFunction(MachineModuleInfo &MMI,
DIBuilder &DIB, Function &F) {
MachineFunction &MF = MMI.getOrCreateMachineFunction(F);
DISubprogram *SP = F.getSubprogram();
assert(SP && "IR Debugify just created it?");
LLVMContext &Ctx = F.getParent()->getContext();
unsigned NextLine = SP->getLine();
for (MachineBasicBlock &MBB : MF) {
for (MachineInstr &MI : MBB) {
// This will likely emit line numbers beyond the end of the imagined
// source function and into subsequent ones. We don't do anything about
// that as it doesn't really matter to the compiler where the line is in
// the imaginary source code.
MI.setDebugLoc(DILocation::get(Ctx, NextLine++, 1, SP));
}
}
return true;
}
/// ModulePass for attaching synthetic debug info to everything, used with the
/// legacy module pass manager.
struct DebugifyMachineModule : public ModulePass {
bool runOnModule(Module &M) override {
MachineModuleInfo &MMI =
getAnalysis<MachineModuleInfoWrapperPass>().getMMI();
return applyDebugifyMetadata(
M, M.functions(),
"ModuleDebugify: ", [&](DIBuilder &DIB, Function &F) -> bool {
return applyDebugifyMetadataToMachineFunction(MMI, DIB, F);
});
}
DebugifyMachineModule() : ModulePass(ID) {}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<MachineModuleInfoWrapperPass>();
AU.addPreserved<MachineModuleInfoWrapperPass>();
}
static char ID; // Pass identification.
};
char DebugifyMachineModule::ID = 0;
} // end anonymous namespace
INITIALIZE_PASS_BEGIN(DebugifyMachineModule, DEBUG_TYPE,
"Machine Debugify Module", false, false)
INITIALIZE_PASS_END(DebugifyMachineModule, DEBUG_TYPE,
"Machine Debugify Module", false, false)
ModulePass *createDebugifyMachineModulePass() {
return new DebugifyMachineModule();
}
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