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llvm-mirror/tools/llvm-objdump/llvm-objdump.cpp
Rafael Espindola 72efd837bc Fix the interpretation of a 0 st_name. 
The ELF spec is very clear:

-----------------------------------------------------------------------------
If the value is non-zero, it represents a string table index that gives the
symbol name. Otherwise, the symbol table entry has no name.
--------------------------------------------------------------------------

In particular, a st_name of 0 most certainly doesn't mean that the symbol has
the same name as the section.

llvm-svn: 238899
2015-06-03 05:14:22 +00:00

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//===-- llvm-objdump.cpp - Object file 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 binutils "objdump", that is, it
// dumps out a plethora of information about an object file depending on the
// flags.
//
// The flags and output of this program should be near identical to those of
// binutils objdump.
//
//===----------------------------------------------------------------------===//
#include "llvm-objdump.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCRelocationInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cctype>
#include <cstring>
#include <system_error>
using namespace llvm;
using namespace object;
static cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);
cl::opt<bool>
llvm::Disassemble("disassemble",
cl::desc("Display assembler mnemonics for the machine instructions"));
static cl::alias
Disassembled("d", cl::desc("Alias for --disassemble"),
cl::aliasopt(Disassemble));
cl::opt<bool>
llvm::Relocations("r", cl::desc("Display the relocation entries in the file"));
cl::opt<bool>
llvm::SectionContents("s", cl::desc("Display the content of each section"));
cl::opt<bool>
llvm::SymbolTable("t", cl::desc("Display the symbol table"));
cl::opt<bool>
llvm::ExportsTrie("exports-trie", cl::desc("Display mach-o exported symbols"));
cl::opt<bool>
llvm::Rebase("rebase", cl::desc("Display mach-o rebasing info"));
cl::opt<bool>
llvm::Bind("bind", cl::desc("Display mach-o binding info"));
cl::opt<bool>
llvm::LazyBind("lazy-bind", cl::desc("Display mach-o lazy binding info"));
cl::opt<bool>
llvm::WeakBind("weak-bind", cl::desc("Display mach-o weak binding info"));
static cl::opt<bool>
MachOOpt("macho", cl::desc("Use MachO specific object file parser"));
static cl::alias
MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachOOpt));
cl::opt<std::string>
llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
"see -version for available targets"));
cl::opt<std::string>
llvm::MCPU("mcpu",
cl::desc("Target a specific cpu type (-mcpu=help for details)"),
cl::value_desc("cpu-name"),
cl::init(""));
cl::opt<std::string>
llvm::ArchName("arch-name", cl::desc("Target arch to disassemble for, "
"see -version for available targets"));
cl::opt<bool>
llvm::SectionHeaders("section-headers", cl::desc("Display summaries of the "
"headers for each section."));
static cl::alias
SectionHeadersShort("headers", cl::desc("Alias for --section-headers"),
cl::aliasopt(SectionHeaders));
static cl::alias
SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
cl::aliasopt(SectionHeaders));
cl::list<std::string>
llvm::MAttrs("mattr",
cl::CommaSeparated,
cl::desc("Target specific attributes"),
cl::value_desc("a1,+a2,-a3,..."));
cl::opt<bool>
llvm::NoShowRawInsn("no-show-raw-insn", cl::desc("When disassembling "
"instructions, do not print "
"the instruction bytes."));
cl::opt<bool>
llvm::UnwindInfo("unwind-info", cl::desc("Display unwind information"));
static cl::alias
UnwindInfoShort("u", cl::desc("Alias for --unwind-info"),
cl::aliasopt(UnwindInfo));
cl::opt<bool>
llvm::PrivateHeaders("private-headers",
cl::desc("Display format specific file headers"));
static cl::alias
PrivateHeadersShort("p", cl::desc("Alias for --private-headers"),
cl::aliasopt(PrivateHeaders));
static StringRef ToolName;
static int ReturnValue = EXIT_SUCCESS;
bool llvm::error(std::error_code EC) {
if (!EC)
return false;
outs() << ToolName << ": error reading file: " << EC.message() << ".\n";
outs().flush();
ReturnValue = EXIT_FAILURE;
return true;
}
static const Target *getTarget(const ObjectFile *Obj = nullptr) {
// Figure out the target triple.
llvm::Triple TheTriple("unknown-unknown-unknown");
if (TripleName.empty()) {
if (Obj) {
TheTriple.setArch(Triple::ArchType(Obj->getArch()));
// TheTriple defaults to ELF, and COFF doesn't have an environment:
// the best we can do here is indicate that it is mach-o.
if (Obj->isMachO())
TheTriple.setObjectFormat(Triple::MachO);
if (Obj->isCOFF()) {
const auto COFFObj = dyn_cast<COFFObjectFile>(Obj);
if (COFFObj->getArch() == Triple::thumb)
TheTriple.setTriple("thumbv7-windows");
}
}
} else
TheTriple.setTriple(Triple::normalize(TripleName));
// Get the target specific parser.
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
Error);
if (!TheTarget) {
errs() << ToolName << ": " << Error;
return nullptr;
}
// Update the triple name and return the found target.
TripleName = TheTriple.getTriple();
return TheTarget;
}
bool llvm::RelocAddressLess(RelocationRef a, RelocationRef b) {
uint64_t a_addr, b_addr;
if (error(a.getOffset(a_addr))) return false;
if (error(b.getOffset(b_addr))) return false;
return a_addr < b_addr;
}
namespace {
class PrettyPrinter {
public:
virtual ~PrettyPrinter(){}
virtual void printInst(MCInstPrinter &IP, const MCInst *MI,
ArrayRef<uint8_t> Bytes, uint64_t Address,
raw_ostream &OS, StringRef Annot,
MCSubtargetInfo const &STI) {
outs() << format("%8" PRIx64 ":", Address);
if (!NoShowRawInsn) {
outs() << "\t";
dumpBytes(Bytes, outs());
}
IP.printInst(MI, outs(), "", STI);
}
};
PrettyPrinter PrettyPrinterInst;
class HexagonPrettyPrinter : public PrettyPrinter {
public:
void printLead(ArrayRef<uint8_t> Bytes, uint64_t Address,
raw_ostream &OS) {
uint32_t opcode =
(Bytes[3] << 24) | (Bytes[2] << 16) | (Bytes[1] << 8) | Bytes[0];
OS << format("%8" PRIx64 ":", Address);
if (!NoShowRawInsn) {
OS << "\t";
dumpBytes(Bytes.slice(0, 4), OS);
OS << format("%08" PRIx32, opcode);
}
}
void printInst(MCInstPrinter &IP, const MCInst *MI,
ArrayRef<uint8_t> Bytes, uint64_t Address,
raw_ostream &OS, StringRef Annot,
MCSubtargetInfo const &STI) override {
std::string Buffer;
{
raw_string_ostream TempStream(Buffer);
IP.printInst(MI, TempStream, "", STI);
}
StringRef Contents(Buffer);
// Split off bundle attributes
auto PacketBundle = Contents.rsplit('\n');
// Split off first instruction from the rest
auto HeadTail = PacketBundle.first.split('\n');
auto Preamble = " { ";
auto Separator = "";
while(!HeadTail.first.empty()) {
OS << Separator;
Separator = "\n";
printLead(Bytes, Address, OS);
OS << Preamble;
Preamble = " ";
StringRef Inst;
auto Duplex = HeadTail.first.split('\v');
if(!Duplex.second.empty()){
OS << Duplex.first;
OS << "; ";
Inst = Duplex.second;
}
else
Inst = HeadTail.first;
OS << Inst;
Bytes = Bytes.slice(4);
Address += 4;
HeadTail = HeadTail.second.split('\n');
}
OS << " } " << PacketBundle.second;
}
};
HexagonPrettyPrinter HexagonPrettyPrinterInst;
PrettyPrinter &selectPrettyPrinter(Triple const &Triple) {
switch(Triple.getArch()) {
default:
return PrettyPrinterInst;
case Triple::hexagon:
return HexagonPrettyPrinterInst;
}
}
}
template <class ELFT>
static const typename ELFObjectFile<ELFT>::Elf_Rel *
getRel(const ELFFile<ELFT> &EF, DataRefImpl Rel) {
typedef typename ELFObjectFile<ELFT>::Elf_Rel Elf_Rel;
return EF.template getEntry<Elf_Rel>(Rel.d.a, Rel.d.b);
}
template <class ELFT>
static const typename ELFObjectFile<ELFT>::Elf_Rela *
getRela(const ELFFile<ELFT> &EF, DataRefImpl Rela) {
typedef typename ELFObjectFile<ELFT>::Elf_Rela Elf_Rela;
return EF.template getEntry<Elf_Rela>(Rela.d.a, Rela.d.b);
}
template <class ELFT>
static std::error_code getRelocationValueString(const ELFObjectFile<ELFT> *Obj,
DataRefImpl Rel,
SmallVectorImpl<char> &Result) {
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
typedef typename ELFObjectFile<ELFT>::Elf_Shdr Elf_Shdr;
const ELFFile<ELFT> &EF = *Obj->getELFFile();
const Elf_Shdr *sec = EF.getSection(Rel.d.a);
uint8_t type;
StringRef res;
int64_t addend = 0;
uint16_t symbol_index = 0;
switch (sec->sh_type) {
default:
return object_error::parse_failed;
case ELF::SHT_REL: {
type = getRel(EF, Rel)->getType(EF.isMips64EL());
symbol_index = getRel(EF, Rel)->getSymbol(EF.isMips64EL());
// TODO: Read implicit addend from section data.
break;
}
case ELF::SHT_RELA: {
type = getRela(EF, Rel)->getType(EF.isMips64EL());
symbol_index = getRela(EF, Rel)->getSymbol(EF.isMips64EL());
addend = getRela(EF, Rel)->r_addend;
break;
}
}
const Elf_Sym *symb =
EF.template getEntry<Elf_Sym>(sec->sh_link, symbol_index);
StringRef Target;
const Elf_Shdr *SymSec = EF.getSection(symb);
if (symb->getType() == ELF::STT_SECTION) {
ErrorOr<StringRef> SecName = EF.getSectionName(SymSec);
if (std::error_code EC = SecName.getError())
return EC;
Target = *SecName;
} else {
ErrorOr<StringRef> SymName =
EF.getSymbolName(EF.getSection(sec->sh_link), symb);
if (!SymName)
return SymName.getError();
Target = *SymName;
}
switch (EF.getHeader()->e_machine) {
case ELF::EM_X86_64:
switch (type) {
case ELF::R_X86_64_PC8:
case ELF::R_X86_64_PC16:
case ELF::R_X86_64_PC32: {
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
fmt << Target << (addend < 0 ? "" : "+") << addend << "-P";
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
} break;
case ELF::R_X86_64_8:
case ELF::R_X86_64_16:
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
case ELF::R_X86_64_64: {
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
fmt << Target << (addend < 0 ? "" : "+") << addend;
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
} break;
default:
res = "Unknown";
}
break;
case ELF::EM_AARCH64: {
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
fmt << Target;
if (addend != 0)
fmt << (addend < 0 ? "" : "+") << addend;
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
break;
}
case ELF::EM_386:
case ELF::EM_ARM:
case ELF::EM_HEXAGON:
case ELF::EM_MIPS:
res = Target;
break;
default:
res = "Unknown";
}
if (Result.empty())
Result.append(res.begin(), res.end());
return object_error::success;
}
static std::error_code getRelocationValueString(const ELFObjectFileBase *Obj,
const RelocationRef &RelRef,
SmallVectorImpl<char> &Result) {
DataRefImpl Rel = RelRef.getRawDataRefImpl();
if (auto *ELF32LE = dyn_cast<ELF32LEObjectFile>(Obj))
return getRelocationValueString(ELF32LE, Rel, Result);
if (auto *ELF64LE = dyn_cast<ELF64LEObjectFile>(Obj))
return getRelocationValueString(ELF64LE, Rel, Result);
if (auto *ELF32BE = dyn_cast<ELF32BEObjectFile>(Obj))
return getRelocationValueString(ELF32BE, Rel, Result);
auto *ELF64BE = cast<ELF64BEObjectFile>(Obj);
return getRelocationValueString(ELF64BE, Rel, Result);
}
static std::error_code getRelocationValueString(const COFFObjectFile *Obj,
const RelocationRef &Rel,
SmallVectorImpl<char> &Result) {
symbol_iterator SymI = Rel.getSymbol();
StringRef SymName;
if (std::error_code EC = SymI->getName(SymName))
return EC;
Result.append(SymName.begin(), SymName.end());
return object_error::success;
}
static void printRelocationTargetName(const MachOObjectFile *O,
const MachO::any_relocation_info &RE,
raw_string_ostream &fmt) {
bool IsScattered = O->isRelocationScattered(RE);
// Target of a scattered relocation is an address. In the interest of
// generating pretty output, scan through the symbol table looking for a
// symbol that aligns with that address. If we find one, print it.
// Otherwise, we just print the hex address of the target.
if (IsScattered) {
uint32_t Val = O->getPlainRelocationSymbolNum(RE);
for (const SymbolRef &Symbol : O->symbols()) {
std::error_code ec;
uint64_t Addr;
StringRef Name;
if ((ec = Symbol.getAddress(Addr)))
report_fatal_error(ec.message());
if (Addr != Val)
continue;
if ((ec = Symbol.getName(Name)))
report_fatal_error(ec.message());
fmt << Name;
return;
}
// If we couldn't find a symbol that this relocation refers to, try
// to find a section beginning instead.
for (const SectionRef &Section : O->sections()) {
std::error_code ec;
StringRef Name;
uint64_t Addr = Section.getAddress();
if (Addr != Val)
continue;
if ((ec = Section.getName(Name)))
report_fatal_error(ec.message());
fmt << Name;
return;
}
fmt << format("0x%x", Val);
return;
}
StringRef S;
bool isExtern = O->getPlainRelocationExternal(RE);
uint64_t Val = O->getPlainRelocationSymbolNum(RE);
if (isExtern) {
symbol_iterator SI = O->symbol_begin();
advance(SI, Val);
SI->getName(S);
} else {
section_iterator SI = O->section_begin();
// Adjust for the fact that sections are 1-indexed.
advance(SI, Val - 1);
SI->getName(S);
}
fmt << S;
}
static std::error_code getRelocationValueString(const MachOObjectFile *Obj,
const RelocationRef &RelRef,
SmallVectorImpl<char> &Result) {
DataRefImpl Rel = RelRef.getRawDataRefImpl();
MachO::any_relocation_info RE = Obj->getRelocation(Rel);
unsigned Arch = Obj->getArch();
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
unsigned Type = Obj->getAnyRelocationType(RE);
bool IsPCRel = Obj->getAnyRelocationPCRel(RE);
// Determine any addends that should be displayed with the relocation.
// These require decoding the relocation type, which is triple-specific.
// X86_64 has entirely custom relocation types.
if (Arch == Triple::x86_64) {
bool isPCRel = Obj->getAnyRelocationPCRel(RE);
switch (Type) {
case MachO::X86_64_RELOC_GOT_LOAD:
case MachO::X86_64_RELOC_GOT: {
printRelocationTargetName(Obj, RE, fmt);
fmt << "@GOT";
if (isPCRel)
fmt << "PCREL";
break;
}
case MachO::X86_64_RELOC_SUBTRACTOR: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
// X86_64_RELOC_UNSIGNED.
// NOTE: Scattered relocations don't exist on x86_64.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::X86_64_RELOC_UNSIGNED)
report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
"X86_64_RELOC_SUBTRACTOR.");
// The X86_64_RELOC_UNSIGNED contains the minuend symbol;
// X86_64_RELOC_SUBTRACTOR contains the subtrahend.
printRelocationTargetName(Obj, RENext, fmt);
fmt << "-";
printRelocationTargetName(Obj, RE, fmt);
break;
}
case MachO::X86_64_RELOC_TLV:
printRelocationTargetName(Obj, RE, fmt);
fmt << "@TLV";
if (isPCRel)
fmt << "P";
break;
case MachO::X86_64_RELOC_SIGNED_1:
printRelocationTargetName(Obj, RE, fmt);
fmt << "-1";
break;
case MachO::X86_64_RELOC_SIGNED_2:
printRelocationTargetName(Obj, RE, fmt);
fmt << "-2";
break;
case MachO::X86_64_RELOC_SIGNED_4:
printRelocationTargetName(Obj, RE, fmt);
fmt << "-4";
break;
default:
printRelocationTargetName(Obj, RE, fmt);
break;
}
// X86 and ARM share some relocation types in common.
} else if (Arch == Triple::x86 || Arch == Triple::arm ||
Arch == Triple::ppc) {
// Generic relocation types...
switch (Type) {
case MachO::GENERIC_RELOC_PAIR: // prints no info
return object_error::success;
case MachO::GENERIC_RELOC_SECTDIFF: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
report_fatal_error("Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_SECTDIFF.");
printRelocationTargetName(Obj, RE, fmt);
fmt << "-";
printRelocationTargetName(Obj, RENext, fmt);
break;
}
}
if (Arch == Triple::x86 || Arch == Triple::ppc) {
switch (Type) {
case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
report_fatal_error("Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_LOCAL_SECTDIFF.");
printRelocationTargetName(Obj, RE, fmt);
fmt << "-";
printRelocationTargetName(Obj, RENext, fmt);
break;
}
case MachO::GENERIC_RELOC_TLV: {
printRelocationTargetName(Obj, RE, fmt);
fmt << "@TLV";
if (IsPCRel)
fmt << "P";
break;
}
default:
printRelocationTargetName(Obj, RE, fmt);
}
} else { // ARM-specific relocations
switch (Type) {
case MachO::ARM_RELOC_HALF:
case MachO::ARM_RELOC_HALF_SECTDIFF: {
// Half relocations steal a bit from the length field to encode
// whether this is an upper16 or a lower16 relocation.
bool isUpper = Obj->getAnyRelocationLength(RE) >> 1;
if (isUpper)
fmt << ":upper16:(";
else
fmt << ":lower16:(";
printRelocationTargetName(Obj, RE, fmt);
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// ARM half relocs must be followed by a relocation of type
// ARM_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::ARM_RELOC_PAIR)
report_fatal_error("Expected ARM_RELOC_PAIR after "
"ARM_RELOC_HALF");
// NOTE: The half of the target virtual address is stashed in the
// address field of the secondary relocation, but we can't reverse
// engineer the constant offset from it without decoding the movw/movt
// instruction to find the other half in its immediate field.
// ARM_RELOC_HALF_SECTDIFF encodes the second section in the
// symbol/section pointer of the follow-on relocation.
if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
fmt << "-";
printRelocationTargetName(Obj, RENext, fmt);
}
fmt << ")";
break;
}
default: { printRelocationTargetName(Obj, RE, fmt); }
}
}
} else
printRelocationTargetName(Obj, RE, fmt);
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
return object_error::success;
}
static std::error_code getRelocationValueString(const RelocationRef &Rel,
SmallVectorImpl<char> &Result) {
const ObjectFile *Obj = Rel.getObjectFile();
if (auto *ELF = dyn_cast<ELFObjectFileBase>(Obj))
return getRelocationValueString(ELF, Rel, Result);
if (auto *COFF = dyn_cast<COFFObjectFile>(Obj))
return getRelocationValueString(COFF, Rel, Result);
auto *MachO = cast<MachOObjectFile>(Obj);
return getRelocationValueString(MachO, Rel, Result);
}
static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
const Target *TheTarget = getTarget(Obj);
// getTarget() will have already issued a diagnostic if necessary, so
// just bail here if it failed.
if (!TheTarget)
return;
// Package up features to be passed to target/subtarget
std::string FeaturesStr;
if (MAttrs.size()) {
SubtargetFeatures Features;
for (unsigned i = 0; i != MAttrs.size(); ++i)
Features.AddFeature(MAttrs[i]);
FeaturesStr = Features.getString();
}
std::unique_ptr<const MCRegisterInfo> MRI(
TheTarget->createMCRegInfo(TripleName));
if (!MRI) {
errs() << "error: no register info for target " << TripleName << "\n";
return;
}
// Set up disassembler.
std::unique_ptr<const MCAsmInfo> AsmInfo(
TheTarget->createMCAsmInfo(*MRI, TripleName));
if (!AsmInfo) {
errs() << "error: no assembly info for target " << TripleName << "\n";
return;
}
std::unique_ptr<const MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
if (!STI) {
errs() << "error: no subtarget info for target " << TripleName << "\n";
return;
}
std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
if (!MII) {
errs() << "error: no instruction info for target " << TripleName << "\n";
return;
}
std::unique_ptr<const MCObjectFileInfo> MOFI(new MCObjectFileInfo);
MCContext Ctx(AsmInfo.get(), MRI.get(), MOFI.get());
std::unique_ptr<MCDisassembler> DisAsm(
TheTarget->createMCDisassembler(*STI, Ctx));
if (!DisAsm) {
errs() << "error: no disassembler for target " << TripleName << "\n";
return;
}
std::unique_ptr<const MCInstrAnalysis> MIA(
TheTarget->createMCInstrAnalysis(MII.get()));
int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
Triple(TripleName), AsmPrinterVariant, *AsmInfo, *MII, *MRI));
if (!IP) {
errs() << "error: no instruction printer for target " << TripleName
<< '\n';
return;
}
PrettyPrinter &PIP = selectPrettyPrinter(Triple(TripleName));
StringRef Fmt = Obj->getBytesInAddress() > 4 ? "\t\t%016" PRIx64 ": " :
"\t\t\t%08" PRIx64 ": ";
// Create a mapping, RelocSecs = SectionRelocMap[S], where sections
// in RelocSecs contain the relocations for section S.
std::error_code EC;
std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
for (const SectionRef &Section : Obj->sections()) {
section_iterator Sec2 = Section.getRelocatedSection();
if (Sec2 != Obj->section_end())
SectionRelocMap[*Sec2].push_back(Section);
}
for (const SectionRef &Section : Obj->sections()) {
if (!Section.isText() || Section.isVirtual())
continue;
uint64_t SectionAddr = Section.getAddress();
uint64_t SectSize = Section.getSize();
if (!SectSize)
continue;
// Make a list of all the symbols in this section.
std::vector<std::pair<uint64_t, StringRef>> Symbols;
for (const SymbolRef &Symbol : Obj->symbols()) {
if (Section.containsSymbol(Symbol)) {
uint64_t Address;
if (error(Symbol.getAddress(Address)))
break;
if (Address == UnknownAddressOrSize)
continue;
Address -= SectionAddr;
if (Address >= SectSize)
continue;
StringRef Name;
if (error(Symbol.getName(Name)))
break;
Symbols.push_back(std::make_pair(Address, Name));
}
}
// Sort the symbols by address, just in case they didn't come in that way.
array_pod_sort(Symbols.begin(), Symbols.end());
// Make a list of all the relocations for this section.
std::vector<RelocationRef> Rels;
if (InlineRelocs) {
for (const SectionRef &RelocSec : SectionRelocMap[Section]) {
for (const RelocationRef &Reloc : RelocSec.relocations()) {
Rels.push_back(Reloc);
}
}
}
// Sort relocations by address.
std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
StringRef SegmentName = "";
if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
DataRefImpl DR = Section.getRawDataRefImpl();
SegmentName = MachO->getSectionFinalSegmentName(DR);
}
StringRef name;
if (error(Section.getName(name)))
break;
outs() << "Disassembly of section ";
if (!SegmentName.empty())
outs() << SegmentName << ",";
outs() << name << ':';
// If the section has no symbols just insert a dummy one and disassemble
// the whole section.
if (Symbols.empty())
Symbols.push_back(std::make_pair(0, name));
SmallString<40> Comments;
raw_svector_ostream CommentStream(Comments);
StringRef BytesStr;
if (error(Section.getContents(BytesStr)))
break;
ArrayRef<uint8_t> Bytes(reinterpret_cast<const uint8_t *>(BytesStr.data()),
BytesStr.size());
uint64_t Size;
uint64_t Index;
std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
std::vector<RelocationRef>::const_iterator rel_end = Rels.end();
// Disassemble symbol by symbol.
for (unsigned si = 0, se = Symbols.size(); si != se; ++si) {
uint64_t Start = Symbols[si].first;
// The end is either the section end or the beginning of the next symbol.
uint64_t End = (si == se - 1) ? SectSize : Symbols[si + 1].first;
// If this symbol has the same address as the next symbol, then skip it.
if (Start == End)
continue;
outs() << '\n' << Symbols[si].second << ":\n";
#ifndef NDEBUG
raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
#else
raw_ostream &DebugOut = nulls();
#endif
for (Index = Start; Index < End; Index += Size) {
MCInst Inst;
if (DisAsm->getInstruction(Inst, Size, Bytes.slice(Index),
SectionAddr + Index, DebugOut,
CommentStream)) {
PIP.printInst(*IP, &Inst,
Bytes.slice(Index, Size),
SectionAddr + Index, outs(), "", *STI);
outs() << CommentStream.str();
Comments.clear();
outs() << "\n";
} else {
errs() << ToolName << ": warning: invalid instruction encoding\n";
if (Size == 0)
Size = 1; // skip illegible bytes
}
// Print relocation for instruction.
while (rel_cur != rel_end) {
bool hidden = false;
uint64_t addr;
SmallString<16> name;
SmallString<32> val;
// If this relocation is hidden, skip it.
if (error(rel_cur->getHidden(hidden))) goto skip_print_rel;
if (hidden) goto skip_print_rel;
if (error(rel_cur->getOffset(addr))) goto skip_print_rel;
// Stop when rel_cur's address is past the current instruction.
if (addr >= Index + Size) break;
if (error(rel_cur->getTypeName(name))) goto skip_print_rel;
if (error(getRelocationValueString(*rel_cur, val)))
goto skip_print_rel;
outs() << format(Fmt.data(), SectionAddr + addr) << name
<< "\t" << val << "\n";
skip_print_rel:
++rel_cur;
}
}
}
}
}
void llvm::PrintRelocations(const ObjectFile *Obj) {
StringRef Fmt = Obj->getBytesInAddress() > 4 ? "%016" PRIx64 :
"%08" PRIx64;
// Regular objdump doesn't print relocations in non-relocatable object
// files.
if (!Obj->isRelocatableObject())
return;
for (const SectionRef &Section : Obj->sections()) {
if (Section.relocation_begin() == Section.relocation_end())
continue;
StringRef secname;
if (error(Section.getName(secname)))
continue;
outs() << "RELOCATION RECORDS FOR [" << secname << "]:\n";
for (const RelocationRef &Reloc : Section.relocations()) {
bool hidden;
uint64_t address;
SmallString<32> relocname;
SmallString<32> valuestr;
if (error(Reloc.getHidden(hidden)))
continue;
if (hidden)
continue;
if (error(Reloc.getTypeName(relocname)))
continue;
if (error(Reloc.getOffset(address)))
continue;
if (error(getRelocationValueString(Reloc, valuestr)))
continue;
outs() << format(Fmt.data(), address) << " " << relocname << " "
<< valuestr << "\n";
}
outs() << "\n";
}
}
void llvm::PrintSectionHeaders(const ObjectFile *Obj) {
outs() << "Sections:\n"
"Idx Name Size Address Type\n";
unsigned i = 0;
for (const SectionRef &Section : Obj->sections()) {
StringRef Name;
if (error(Section.getName(Name)))
return;
uint64_t Address = Section.getAddress();
uint64_t Size = Section.getSize();
bool Text = Section.isText();
bool Data = Section.isData();
bool BSS = Section.isBSS();
std::string Type = (std::string(Text ? "TEXT " : "") +
(Data ? "DATA " : "") + (BSS ? "BSS" : ""));
outs() << format("%3d %-13s %08" PRIx64 " %016" PRIx64 " %s\n", i,
Name.str().c_str(), Size, Address, Type.c_str());
++i;
}
}
void llvm::PrintSectionContents(const ObjectFile *Obj) {
std::error_code EC;
for (const SectionRef &Section : Obj->sections()) {
StringRef Name;
StringRef Contents;
if (error(Section.getName(Name)))
continue;
uint64_t BaseAddr = Section.getAddress();
uint64_t Size = Section.getSize();
if (!Size)
continue;
outs() << "Contents of section " << Name << ":\n";
if (Section.isBSS()) {
outs() << format("<skipping contents of bss section at [%04" PRIx64
", %04" PRIx64 ")>\n",
BaseAddr, BaseAddr + Size);
continue;
}
if (error(Section.getContents(Contents)))
continue;
// Dump out the content as hex and printable ascii characters.
for (std::size_t addr = 0, end = Contents.size(); addr < end; addr += 16) {
outs() << format(" %04" PRIx64 " ", BaseAddr + addr);
// Dump line of hex.
for (std::size_t i = 0; i < 16; ++i) {
if (i != 0 && i % 4 == 0)
outs() << ' ';
if (addr + i < end)
outs() << hexdigit((Contents[addr + i] >> 4) & 0xF, true)
<< hexdigit(Contents[addr + i] & 0xF, true);
else
outs() << " ";
}
// Print ascii.
outs() << " ";
for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
if (std::isprint(static_cast<unsigned char>(Contents[addr + i]) & 0xFF))
outs() << Contents[addr + i];
else
outs() << ".";
}
outs() << "\n";
}
}
}
static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
for (unsigned SI = 0, SE = coff->getNumberOfSymbols(); SI != SE; ++SI) {
ErrorOr<COFFSymbolRef> Symbol = coff->getSymbol(SI);
StringRef Name;
if (error(Symbol.getError()))
return;
if (error(coff->getSymbolName(*Symbol, Name)))
return;
outs() << "[" << format("%2d", SI) << "]"
<< "(sec " << format("%2d", int(Symbol->getSectionNumber())) << ")"
<< "(fl 0x00)" // Flag bits, which COFF doesn't have.
<< "(ty " << format("%3x", unsigned(Symbol->getType())) << ")"
<< "(scl " << format("%3x", unsigned(Symbol->getStorageClass())) << ") "
<< "(nx " << unsigned(Symbol->getNumberOfAuxSymbols()) << ") "
<< "0x" << format("%08x", unsigned(Symbol->getValue())) << " "
<< Name << "\n";
for (unsigned AI = 0, AE = Symbol->getNumberOfAuxSymbols(); AI < AE; ++AI, ++SI) {
if (Symbol->isSectionDefinition()) {
const coff_aux_section_definition *asd;
if (error(coff->getAuxSymbol<coff_aux_section_definition>(SI + 1, asd)))
return;
int32_t AuxNumber = asd->getNumber(Symbol->isBigObj());
outs() << "AUX "
<< format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
, unsigned(asd->Length)
, unsigned(asd->NumberOfRelocations)
, unsigned(asd->NumberOfLinenumbers)
, unsigned(asd->CheckSum))
<< format("assoc %d comdat %d\n"
, unsigned(AuxNumber)
, unsigned(asd->Selection));
} else if (Symbol->isFileRecord()) {
const char *FileName;
if (error(coff->getAuxSymbol<char>(SI + 1, FileName)))
return;
StringRef Name(FileName, Symbol->getNumberOfAuxSymbols() *
coff->getSymbolTableEntrySize());
outs() << "AUX " << Name.rtrim(StringRef("\0", 1)) << '\n';
SI = SI + Symbol->getNumberOfAuxSymbols();
break;
} else {
outs() << "AUX Unknown\n";
}
}
}
}
void llvm::PrintSymbolTable(const ObjectFile *o) {
outs() << "SYMBOL TABLE:\n";
if (const COFFObjectFile *coff = dyn_cast<const COFFObjectFile>(o)) {
PrintCOFFSymbolTable(coff);
return;
}
for (const SymbolRef &Symbol : o->symbols()) {
uint64_t Address;
SymbolRef::Type Type;
uint32_t Flags = Symbol.getFlags();
section_iterator Section = o->section_end();
if (error(Symbol.getAddress(Address)))
continue;
if (error(Symbol.getType(Type)))
continue;
uint64_t Size = Symbol.getSize();
if (error(Symbol.getSection(Section)))
continue;
StringRef Name;
if (Type == SymbolRef::ST_Debug && Section != o->section_end()) {
Section->getName(Name);
} else if (error(Symbol.getName(Name))) {
continue;
}
bool Global = Flags & SymbolRef::SF_Global;
bool Weak = Flags & SymbolRef::SF_Weak;
bool Absolute = Flags & SymbolRef::SF_Absolute;
bool Common = Flags & SymbolRef::SF_Common;
bool Hidden = Flags & SymbolRef::SF_Hidden;
if (Common) {
uint32_t Alignment = Symbol.getAlignment();
Address = Size;
Size = Alignment;
}
if (Address == UnknownAddressOrSize)
Address = 0;
if (Size == UnknownAddressOrSize)
Size = 0;
char GlobLoc = ' ';
if (Type != SymbolRef::ST_Unknown)
GlobLoc = Global ? 'g' : 'l';
char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
? 'd' : ' ';
char FileFunc = ' ';
if (Type == SymbolRef::ST_File)
FileFunc = 'f';
else if (Type == SymbolRef::ST_Function)
FileFunc = 'F';
const char *Fmt = o->getBytesInAddress() > 4 ? "%016" PRIx64 :
"%08" PRIx64;
outs() << format(Fmt, Address) << " "
<< GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
<< (Weak ? 'w' : ' ') // Weak?
<< ' ' // Constructor. Not supported yet.
<< ' ' // Warning. Not supported yet.
<< ' ' // Indirect reference to another symbol.
<< Debug // Debugging (d) or dynamic (D) symbol.
<< FileFunc // Name of function (F), file (f) or object (O).
<< ' ';
if (Absolute) {
outs() << "*ABS*";
} else if (Common) {
outs() << "*COM*";
} else if (Section == o->section_end()) {
outs() << "*UND*";
} else {
if (const MachOObjectFile *MachO =
dyn_cast<const MachOObjectFile>(o)) {
DataRefImpl DR = Section->getRawDataRefImpl();
StringRef SegmentName = MachO->getSectionFinalSegmentName(DR);
outs() << SegmentName << ",";
}
StringRef SectionName;
if (error(Section->getName(SectionName)))
SectionName = "";
outs() << SectionName;
}
outs() << '\t'
<< format("%08" PRIx64 " ", Size);
if (Hidden) {
outs() << ".hidden ";
}
outs() << Name
<< '\n';
}
}
static void PrintUnwindInfo(const ObjectFile *o) {
outs() << "Unwind info:\n\n";
if (const COFFObjectFile *coff = dyn_cast<COFFObjectFile>(o)) {
printCOFFUnwindInfo(coff);
} else if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
printMachOUnwindInfo(MachO);
else {
// TODO: Extract DWARF dump tool to objdump.
errs() << "This operation is only currently supported "
"for COFF and MachO object files.\n";
return;
}
}
void llvm::printExportsTrie(const ObjectFile *o) {
outs() << "Exports trie:\n";
if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
printMachOExportsTrie(MachO);
else {
errs() << "This operation is only currently supported "
"for Mach-O executable files.\n";
return;
}
}
void llvm::printRebaseTable(const ObjectFile *o) {
outs() << "Rebase table:\n";
if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
printMachORebaseTable(MachO);
else {
errs() << "This operation is only currently supported "
"for Mach-O executable files.\n";
return;
}
}
void llvm::printBindTable(const ObjectFile *o) {
outs() << "Bind table:\n";
if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
printMachOBindTable(MachO);
else {
errs() << "This operation is only currently supported "
"for Mach-O executable files.\n";
return;
}
}
void llvm::printLazyBindTable(const ObjectFile *o) {
outs() << "Lazy bind table:\n";
if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
printMachOLazyBindTable(MachO);
else {
errs() << "This operation is only currently supported "
"for Mach-O executable files.\n";
return;
}
}
void llvm::printWeakBindTable(const ObjectFile *o) {
outs() << "Weak bind table:\n";
if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
printMachOWeakBindTable(MachO);
else {
errs() << "This operation is only currently supported "
"for Mach-O executable files.\n";
return;
}
}
static void printPrivateFileHeader(const ObjectFile *o) {
if (o->isELF()) {
printELFFileHeader(o);
} else if (o->isCOFF()) {
printCOFFFileHeader(o);
} else if (o->isMachO()) {
printMachOFileHeader(o);
}
}
static void DumpObject(const ObjectFile *o) {
outs() << '\n';
outs() << o->getFileName()
<< ":\tfile format " << o->getFileFormatName() << "\n\n";
if (Disassemble)
DisassembleObject(o, Relocations);
if (Relocations && !Disassemble)
PrintRelocations(o);
if (SectionHeaders)
PrintSectionHeaders(o);
if (SectionContents)
PrintSectionContents(o);
if (SymbolTable)
PrintSymbolTable(o);
if (UnwindInfo)
PrintUnwindInfo(o);
if (PrivateHeaders)
printPrivateFileHeader(o);
if (ExportsTrie)
printExportsTrie(o);
if (Rebase)
printRebaseTable(o);
if (Bind)
printBindTable(o);
if (LazyBind)
printLazyBindTable(o);
if (WeakBind)
printWeakBindTable(o);
}
/// @brief Dump each object file in \a a;
static void DumpArchive(const Archive *a) {
for (Archive::child_iterator i = a->child_begin(), e = a->child_end(); i != e;
++i) {
ErrorOr<std::unique_ptr<Binary>> ChildOrErr = i->getAsBinary();
if (std::error_code EC = ChildOrErr.getError()) {
// Ignore non-object files.
if (EC != object_error::invalid_file_type)
errs() << ToolName << ": '" << a->getFileName() << "': " << EC.message()
<< ".\n";
continue;
}
if (ObjectFile *o = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
DumpObject(o);
else
errs() << ToolName << ": '" << a->getFileName() << "': "
<< "Unrecognized file type.\n";
}
}
/// @brief Open file and figure out how to dump it.
static void DumpInput(StringRef file) {
// If file isn't stdin, check that it exists.
if (file != "-" && !sys::fs::exists(file)) {
errs() << ToolName << ": '" << file << "': " << "No such file\n";
return;
}
// If we are using the Mach-O specific object file parser, then let it parse
// the file and process the command line options. So the -arch flags can
// be used to select specific slices, etc.
if (MachOOpt) {
ParseInputMachO(file);
return;
}
// Attempt to open the binary.
ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(file);
if (std::error_code EC = BinaryOrErr.getError()) {
errs() << ToolName << ": '" << file << "': " << EC.message() << ".\n";
return;
}
Binary &Binary = *BinaryOrErr.get().getBinary();
if (Archive *a = dyn_cast<Archive>(&Binary))
DumpArchive(a);
else if (ObjectFile *o = dyn_cast<ObjectFile>(&Binary))
DumpObject(o);
else
errs() << ToolName << ": '" << file << "': " << "Unrecognized file type.\n";
}
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.
// Initialize targets and assembly printers/parsers.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
// Register the target printer for --version.
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
TripleName = Triple::normalize(TripleName);
ToolName = argv[0];
// Defaults to a.out if no filenames specified.
if (InputFilenames.size() == 0)
InputFilenames.push_back("a.out");
if (!Disassemble
&& !Relocations
&& !SectionHeaders
&& !SectionContents
&& !SymbolTable
&& !UnwindInfo
&& !PrivateHeaders
&& !ExportsTrie
&& !Rebase
&& !Bind
&& !LazyBind
&& !WeakBind
&& !(UniversalHeaders && MachOOpt)
&& !(ArchiveHeaders && MachOOpt)
&& !(IndirectSymbols && MachOOpt)
&& !(DataInCode && MachOOpt)
&& !(LinkOptHints && MachOOpt)
&& !(InfoPlist && MachOOpt)
&& !(DylibsUsed && MachOOpt)
&& !(DylibId && MachOOpt)
&& !(ObjcMetaData && MachOOpt)
&& !(DumpSections.size() != 0 && MachOOpt)) {
cl::PrintHelpMessage();
return 2;
}
std::for_each(InputFilenames.begin(), InputFilenames.end(),
DumpInput);
return ReturnValue;
}
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