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//===-- ModuleDebugInfoPrinter.cpp - Prints module debug info metadata ----===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This pass decodes the debug info metadata in a module and prints in a
// (sufficiently-prepared-) human-readable form.
//
// For example, run this pass from opt along with the -analyze option, and
// it'll print to standard output.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/ModuleDebugInfoPrinter.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/PassManager.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class ModuleDebugInfoLegacyPrinter : public ModulePass {
DebugInfoFinder Finder;
public:
static char ID; // Pass identification, replacement for typeid
ModuleDebugInfoLegacyPrinter() : ModulePass(ID) {
initializeModuleDebugInfoLegacyPrinterPass(
*PassRegistry::getPassRegistry());
}
bool runOnModule(Module &M) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
}
void print(raw_ostream &O, const Module *M) const override;
};
}
char ModuleDebugInfoLegacyPrinter::ID = 0;
INITIALIZE_PASS(ModuleDebugInfoLegacyPrinter, "module-debuginfo",
"Decodes module-level debug info", false, true)
ModulePass *llvm::createModuleDebugInfoPrinterPass() {
return new ModuleDebugInfoLegacyPrinter();
}
bool ModuleDebugInfoLegacyPrinter::runOnModule(Module &M) {
Finder.processModule(M);
return false;
}
static void printFile(raw_ostream &O, StringRef Filename, StringRef Directory,
unsigned Line = 0) {
if (Filename.empty())
return;
O << " from ";
if (!Directory.empty())
O << Directory << "/";
O << Filename;
if (Line)
O << ":" << Line;
}
static void printModuleDebugInfo(raw_ostream &O, const Module *M,
const DebugInfoFinder &Finder) {
// Printing the nodes directly isn't particularly helpful (since they
// reference other nodes that won't be printed, particularly for the
// filenames), so just print a few useful things.
for (DICompileUnit *CU : Finder.compile_units()) {
O << "Compile unit: ";
auto Lang = dwarf::LanguageString(CU->getSourceLanguage());
if (!Lang.empty())
O << Lang;
else
O << "unknown-language(" << CU->getSourceLanguage() << ")";
printFile(O, CU->getFilename(), CU->getDirectory());
O << '\n';
}
for (DISubprogram *S : Finder.subprograms()) {
O << "Subprogram: " << S->getName();
printFile(O, S->getFilename(), S->getDirectory(), S->getLine());
if (!S->getLinkageName().empty())
O << " ('" << S->getLinkageName() << "')";
O << '\n';
}
for (auto *GVU : Finder.global_variables()) {
const auto *GV = GVU->getVariable();
O << "Global variable: " << GV->getName();
printFile(O, GV->getFilename(), GV->getDirectory(), GV->getLine());
if (!GV->getLinkageName().empty())
O << " ('" << GV->getLinkageName() << "')";
O << '\n';
}
for (const DIType *T : Finder.types()) {
O << "Type:";
if (!T->getName().empty())
O << ' ' << T->getName();
printFile(O, T->getFilename(), T->getDirectory(), T->getLine());
if (auto *BT = dyn_cast<DIBasicType>(T)) {
O << " ";
auto Encoding = dwarf::AttributeEncodingString(BT->getEncoding());
if (!Encoding.empty())
O << Encoding;
else
O << "unknown-encoding(" << BT->getEncoding() << ')';
} else {
O << ' ';
auto Tag = dwarf::TagString(T->getTag());
if (!Tag.empty())
O << Tag;
else
O << "unknown-tag(" << T->getTag() << ")";
}
if (auto *CT = dyn_cast<DICompositeType>(T)) {
if (auto *S = CT->getRawIdentifier())
O << " (identifier: '" << S->getString() << "')";
}
O << '\n';
}
}
void ModuleDebugInfoLegacyPrinter::print(raw_ostream &O,
const Module *M) const {
printModuleDebugInfo(O, M, Finder);
}
ModuleDebugInfoPrinterPass::ModuleDebugInfoPrinterPass(raw_ostream &OS)
: OS(OS) {}
PreservedAnalyses ModuleDebugInfoPrinterPass::run(Module &M,
ModuleAnalysisManager &AM) {
Finder.processModule(M);
printModuleDebugInfo(OS, &M, Finder);
return PreservedAnalyses::all();
}
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