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//===-- ModuleDebugInfoPrinter.cpp - Prints module debug info metadata ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/Passes.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/Pass.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class ModuleDebugInfoPrinter : public ModulePass {
DebugInfoFinder Finder;
public:
static char ID; // Pass identification, replacement for typeid
ModuleDebugInfoPrinter() : ModulePass(ID) {
initializeModuleDebugInfoPrinterPass(*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 ModuleDebugInfoPrinter::ID = 0;
INITIALIZE_PASS(ModuleDebugInfoPrinter, "module-debuginfo",
"Decodes module-level debug info", false, true)
ModulePass *llvm::createModuleDebugInfoPrinterPass() {
return new ModuleDebugInfoPrinter();
}
bool ModuleDebugInfoPrinter::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;
}
void ModuleDebugInfoPrinter::print(raw_ostream &O, const Module *M) const {
// 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: ";
if (const char *Lang = LanguageString(CU.getLanguage()))
O << Lang;
else
O << "unknown-language(" << CU.getLanguage() << ")";
printFile(O, CU.getFilename(), CU.getDirectory());
O << '\n';
}
for (DISubprogram S : Finder.subprograms()) {
O << "Subprogram: " << S.getName();
printFile(O, S.getFilename(), S.getDirectory(), S.getLineNumber());
if (!S.getLinkageName().empty())
O << " ('" << S.getLinkageName() << "')";
O << '\n';
}
for (DIGlobalVariable GV : Finder.global_variables()) {
O << "Global variable: " << GV.getName();
printFile(O, GV.getFilename(), GV.getDirectory(), GV.getLineNumber());
if (!GV.getLinkageName().empty())
O << " ('" << GV.getLinkageName() << "')";
O << '\n';
}
for (DIType T : Finder.types()) {
O << "Type:";
if (!T.getName().empty())
O << ' ' << T.getName();
printFile(O, T.getFilename(), T.getDirectory(), T.getLineNumber());
if (T.isBasicType()) {
DIBasicType BT(T.get());
O << " ";
if (const char *Encoding =
dwarf::AttributeEncodingString(BT.getEncoding()))
O << Encoding;
else
O << "unknown-encoding(" << BT.getEncoding() << ')';
} else {
O << ' ';
if (const char *Tag = dwarf::TagString(T.getTag()))
O << Tag;
else
O << "unknown-tag(" << T.getTag() << ")";
}
if (T.isCompositeType()) {
DICompositeType CT(T.get());
if (auto *S = CT.getIdentifier())
O << " (identifier: '" << S->getString() << "')";
}
O << '\n';
}
}
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