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