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//===-- llvm-dwarfdump.cpp - Debug info dumping utility for llvm ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like "dwarfdump".
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/RelocVisitor.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include <algorithm>
#include <cstring>
#include <list>
#include <string>
using namespace llvm;
using namespace object;
static cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input object files>"),
cl::ZeroOrMore);
static cl::opt<unsigned long long>
Address("address", cl::init(-1ULL),
cl::desc("Print line information for a given address"));
static cl::opt<bool>
PrintFunctions("functions", cl::init(false),
cl::desc("Print function names as well as line information "
"for a given address"));
static cl::opt<bool>
PrintInlining("inlining", cl::init(false),
cl::desc("Print all inlined frames for a given address"));
static void PrintDILineInfo(DILineInfo dli) {
if (PrintFunctions)
outs() << (dli.getFunctionName() ? dli.getFunctionName() : "<unknown>")
<< "\n";
outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
<< dli.getLine() << ':' << dli.getColumn() << '\n';
}
static void DumpInput(const StringRef &Filename) {
OwningPtr<MemoryBuffer> Buff;
if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
errs() << Filename << ": " << ec.message() << "\n";
return;
}
OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
StringRef DebugInfoSection;
RelocAddrMap RelocMap;
StringRef DebugAbbrevSection;
StringRef DebugLineSection;
StringRef DebugArangesSection;
StringRef DebugStringSection;
StringRef DebugRangesSection;
error_code ec;
for (section_iterator i = Obj->begin_sections(),
e = Obj->end_sections();
i != e; i.increment(ec)) {
StringRef name;
i->getName(name);
StringRef data;
i->getContents(data);
if (name.startswith("__DWARF,"))
name = name.substr(8); // Skip "__DWARF," prefix.
name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
if (name == "debug_info")
DebugInfoSection = data;
else if (name == "debug_abbrev")
DebugAbbrevSection = data;
else if (name == "debug_line")
DebugLineSection = data;
else if (name == "debug_aranges")
DebugArangesSection = data;
else if (name == "debug_str")
DebugStringSection = data;
else if (name == "debug_ranges")
DebugRangesSection = data;
// Any more debug info sections go here.
else
continue;
// TODO: For now only handle relocations for the debug_info section.
if (name != "debug_info")
continue;
if (i->begin_relocations() != i->end_relocations()) {
uint64_t SectionSize;
i->getSize(SectionSize);
for (relocation_iterator reloc_i = i->begin_relocations(),
reloc_e = i->end_relocations();
reloc_i != reloc_e; reloc_i.increment(ec)) {
uint64_t Address;
reloc_i->getAddress(Address);
uint64_t Type;
reloc_i->getType(Type);
RelocVisitor V(Obj->getFileFormatName());
// The section address is always 0 for debug sections.
RelocToApply R(V.visit(Type, *reloc_i));
if (V.error()) {
SmallString<32> Name;
error_code ec(reloc_i->getTypeName(Name));
if (ec) {
errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
}
errs() << "error: failed to compute relocation: "
<< Name << "\n";
continue;
}
if (Address + R.Width > SectionSize) {
errs() << "error: " << R.Width << "-byte relocation starting "
<< Address << " bytes into section " << name << " which is "
<< SectionSize << " bytes long.\n";
continue;
}
if (R.Width > 8) {
errs() << "error: can't handle a relocation of more than 8 bytes at "
"a time.\n";
continue;
}
DEBUG(dbgs() << "Writing " << format("%p", R.Value)
<< " at " << format("%p", Address)
<< " with width " << format("%d", R.Width)
<< "\n");
RelocMap[Address] = std::make_pair(R.Width, R.Value);
}
}
}
OwningPtr<DIContext> dictx(DIContext::getDWARFContext(/*FIXME*/true,
DebugInfoSection,
DebugAbbrevSection,
DebugArangesSection,
DebugLineSection,
DebugStringSection,
DebugRangesSection,
&RelocMap));
if (Address == -1ULL) {
outs() << Filename
<< ":\tfile format " << Obj->getFileFormatName() << "\n\n";
// Dump the complete DWARF structure.
dictx->dump(outs());
} else {
// Print line info for the specified address.
int SpecFlags = DILineInfoSpecifier::FileLineInfo |
DILineInfoSpecifier::AbsoluteFilePath;
if (PrintFunctions)
SpecFlags |= DILineInfoSpecifier::FunctionName;
if (PrintInlining) {
DIInliningInfo InliningInfo =
dictx->getInliningInfoForAddress(Address, SpecFlags);
uint32_t n = InliningInfo.getNumberOfFrames();
if (n == 0) {
// Print one empty debug line info in any case.
PrintDILineInfo(DILineInfo());
} else {
for (uint32_t i = 0; i < n; i++) {
DILineInfo dli = InliningInfo.getFrame(i);
PrintDILineInfo(dli);
}
}
} else {
DILineInfo dli = dictx->getLineInfoForAddress(Address, SpecFlags);
PrintDILineInfo(dli);
}
}
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm dwarf dumper\n");
// Defaults to a.out if no filenames specified.
if (InputFilenames.size() == 0)
InputFilenames.push_back("a.out");
std::for_each(InputFilenames.begin(), InputFilenames.end(), DumpInput);
return 0;
}
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