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//===- llvm-readobj.cpp - Dump contents of an Object File -----------------===//
//
// 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 traditional Unix "readelf",
// except that it can handle any type of object file recognized by lib/Object.
//
// It makes use of the generic ObjectFile interface.
//
// Caution: This utility is new, experimental, unsupported, and incomplete.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Object/ELF.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
using namespace llvm;
using namespace llvm::object;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input object>"), cl::init(""));
static const char *getTypeStr(SymbolRef::Type Type) {
switch (Type) {
case SymbolRef::ST_Unknown: return "?";
case SymbolRef::ST_Data: return "DATA";
case SymbolRef::ST_Debug: return "DBG";
case SymbolRef::ST_File: return "FILE";
case SymbolRef::ST_Function: return "FUNC";
case SymbolRef::ST_Other: return "-";
}
return "INV";
}
static std::string getSymbolFlagStr(uint32_t Flags) {
std::string result;
if (Flags & SymbolRef::SF_Undefined)
result += "undef,";
if (Flags & SymbolRef::SF_Global)
result += "global,";
if (Flags & SymbolRef::SF_Weak)
result += "weak,";
if (Flags & SymbolRef::SF_Absolute)
result += "absolute,";
if (Flags & SymbolRef::SF_ThreadLocal)
result += "threadlocal,";
if (Flags & SymbolRef::SF_Common)
result += "common,";
if (Flags & SymbolRef::SF_FormatSpecific)
result += "formatspecific,";
// Remove trailing comma
if (result.size() > 0) {
result.erase(result.size() - 1);
}
return result;
}
static void checkError(error_code ec, const char *msg) {
if (ec)
report_fatal_error(std::string(msg) + ": " + ec.message());
}
static void
dumpSymbol(const SymbolRef &Sym, const ObjectFile *obj, bool IsDynamic) {
StringRef Name;
SymbolRef::Type Type;
uint32_t Flags;
uint64_t Address;
uint64_t Size;
uint64_t FileOffset;
checkError(Sym.getName(Name), "SymbolRef.getName() failed");
checkError(Sym.getAddress(Address), "SymbolRef.getAddress() failed");
checkError(Sym.getSize(Size), "SymbolRef.getSize() failed");
checkError(Sym.getFileOffset(FileOffset),
"SymbolRef.getFileOffset() failed");
checkError(Sym.getType(Type), "SymbolRef.getType() failed");
checkError(Sym.getFlags(Flags), "SymbolRef.getFlags() failed");
std::string FullName = Name;
// If this is a dynamic symbol from an ELF object, append
// the symbol's version to the name.
if (IsDynamic && obj->isELF()) {
StringRef Version;
bool IsDefault;
GetELFSymbolVersion(obj, Sym, Version, IsDefault);
if (!Version.empty()) {
FullName += (IsDefault ? "@@" : "@");
FullName += Version;
}
}
// format() can't handle StringRefs
outs() << format(" %-32s", FullName.c_str())
<< format(" %-4s", getTypeStr(Type))
<< format(" %16" PRIx64, Address)
<< format(" %16" PRIx64, Size)
<< format(" %16" PRIx64, FileOffset)
<< " " << getSymbolFlagStr(Flags)
<< "\n";
}
// Iterate through the normal symbols in the ObjectFile
static void dumpSymbols(const ObjectFile *obj) {
error_code ec;
uint32_t count = 0;
outs() << "Symbols:\n";
symbol_iterator it = obj->begin_symbols();
symbol_iterator ie = obj->end_symbols();
while (it != ie) {
dumpSymbol(*it, obj, false);
it.increment(ec);
if (ec)
report_fatal_error("Symbol iteration failed");
++count;
}
outs() << " Total: " << count << "\n\n";
}
// Iterate through the dynamic symbols in the ObjectFile.
static void dumpDynamicSymbols(const ObjectFile *obj) {
error_code ec;
uint32_t count = 0;
outs() << "Dynamic Symbols:\n";
symbol_iterator it = obj->begin_dynamic_symbols();
symbol_iterator ie = obj->end_dynamic_symbols();
while (it != ie) {
dumpSymbol(*it, obj, true);
it.increment(ec);
if (ec)
report_fatal_error("Symbol iteration failed");
++count;
}
outs() << " Total: " << count << "\n\n";
}
static void dumpLibrary(const LibraryRef &lib) {
StringRef path;
lib.getPath(path);
outs() << " " << path << "\n";
}
// Iterate through needed libraries
static void dumpLibrariesNeeded(const ObjectFile *obj) {
error_code ec;
uint32_t count = 0;
library_iterator it = obj->begin_libraries_needed();
library_iterator ie = obj->end_libraries_needed();
outs() << "Libraries needed:\n";
while (it != ie) {
dumpLibrary(*it);
it.increment(ec);
if (ec)
report_fatal_error("Needed libraries iteration failed");
++count;
}
outs() << " Total: " << count << "\n\n";
}
static void dumpHeaders(const ObjectFile *obj) {
outs() << "File Format : " << obj->getFileFormatName() << "\n";
outs() << "Arch : "
<< Triple::getArchTypeName((llvm::Triple::ArchType)obj->getArch())
<< "\n";
outs() << "Address Size: " << (8*obj->getBytesInAddress()) << " bits\n";
outs() << "Load Name : " << obj->getLoadName() << "\n";
outs() << "\n";
}
int main(int argc, char** argv) {
error_code ec;
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
cl::ParseCommandLineOptions(argc, argv,
"LLVM Object Reader\n");
if (InputFilename.empty()) {
errs() << "Please specify an input filename\n";
return 1;
}
// Open the object file
OwningPtr<MemoryBuffer> File;
if (MemoryBuffer::getFile(InputFilename, File)) {
errs() << InputFilename << ": Open failed\n";
return 1;
}
ObjectFile *obj = ObjectFile::createObjectFile(File.take());
if (!obj) {
errs() << InputFilename << ": Object type not recognized\n";
}
dumpHeaders(obj);
dumpSymbols(obj);
dumpDynamicSymbols(obj);
dumpLibrariesNeeded(obj);
return 0;
}
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