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73f2a7bbb2
llvm-6502/tools/llvm-nm/llvm-nm.cpp
David Blaikie dce96380c1 Cleanup else-after-return and add an early-return to llvm-nm 
The loop and error handling in checkMachOAndArchFlags didn't make sense
to me (a loop that only ever executes once? An error path that uses the
element the loop stopped at (which must always be a buffer overrun if
I'm reading that right?)... I'm confused) but I've made a guess at what
was intended.

Based on a patch by Richard Thomson to simplify boolean expressions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233025 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-23 21:17:43 +00:00

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//===-- llvm-nm.cpp - Symbol table 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 traditional Unix "nm", that is, it
// prints out the names of symbols in a bitcode or object file, along with some
// information about each symbol.
//
// This "nm" supports many of the features of GNU "nm", including its different
// output formats.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/IRObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/COFF.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cctype>
#include <cerrno>
#include <cstring>
#include <system_error>
#include <vector>
using namespace llvm;
using namespace object;
namespace {
enum OutputFormatTy { bsd, sysv, posix, darwin };
cl::opt<OutputFormatTy> OutputFormat(
"format", cl::desc("Specify output format"),
cl::values(clEnumVal(bsd, "BSD format"), clEnumVal(sysv, "System V format"),
clEnumVal(posix, "POSIX.2 format"),
clEnumVal(darwin, "Darwin -m format"), clEnumValEnd),
cl::init(bsd));
cl::alias OutputFormat2("f", cl::desc("Alias for --format"),
cl::aliasopt(OutputFormat));
cl::list<std::string> InputFilenames(cl::Positional, cl::desc("<input files>"),
cl::ZeroOrMore);
cl::opt<bool> UndefinedOnly("undefined-only",
cl::desc("Show only undefined symbols"));
cl::alias UndefinedOnly2("u", cl::desc("Alias for --undefined-only"),
cl::aliasopt(UndefinedOnly));
cl::opt<bool> DynamicSyms("dynamic",
cl::desc("Display the dynamic symbols instead "
"of normal symbols."));
cl::alias DynamicSyms2("D", cl::desc("Alias for --dynamic"),
cl::aliasopt(DynamicSyms));
cl::opt<bool> DefinedOnly("defined-only",
cl::desc("Show only defined symbols"));
cl::alias DefinedOnly2("U", cl::desc("Alias for --defined-only"),
cl::aliasopt(DefinedOnly));
cl::opt<bool> ExternalOnly("extern-only",
cl::desc("Show only external symbols"));
cl::alias ExternalOnly2("g", cl::desc("Alias for --extern-only"),
cl::aliasopt(ExternalOnly));
cl::opt<bool> BSDFormat("B", cl::desc("Alias for --format=bsd"));
cl::opt<bool> POSIXFormat("P", cl::desc("Alias for --format=posix"));
cl::opt<bool> DarwinFormat("m", cl::desc("Alias for --format=darwin"));
static cl::list<std::string>
ArchFlags("arch", cl::desc("architecture(s) from a Mach-O file to dump"),
cl::ZeroOrMore);
bool ArchAll = false;
cl::opt<bool> PrintFileName(
"print-file-name",
cl::desc("Precede each symbol with the object file it came from"));
cl::alias PrintFileNameA("A", cl::desc("Alias for --print-file-name"),
cl::aliasopt(PrintFileName));
cl::alias PrintFileNameo("o", cl::desc("Alias for --print-file-name"),
cl::aliasopt(PrintFileName));
cl::opt<bool> DebugSyms("debug-syms",
cl::desc("Show all symbols, even debugger only"));
cl::alias DebugSymsa("a", cl::desc("Alias for --debug-syms"),
cl::aliasopt(DebugSyms));
cl::opt<bool> NumericSort("numeric-sort", cl::desc("Sort symbols by address"));
cl::alias NumericSortn("n", cl::desc("Alias for --numeric-sort"),
cl::aliasopt(NumericSort));
cl::alias NumericSortv("v", cl::desc("Alias for --numeric-sort"),
cl::aliasopt(NumericSort));
cl::opt<bool> NoSort("no-sort", cl::desc("Show symbols in order encountered"));
cl::alias NoSortp("p", cl::desc("Alias for --no-sort"), cl::aliasopt(NoSort));
cl::opt<bool> ReverseSort("reverse-sort", cl::desc("Sort in reverse order"));
cl::alias ReverseSortr("r", cl::desc("Alias for --reverse-sort"),
cl::aliasopt(ReverseSort));
cl::opt<bool> PrintSize("print-size",
cl::desc("Show symbol size instead of address"));
cl::alias PrintSizeS("S", cl::desc("Alias for --print-size"),
cl::aliasopt(PrintSize));
cl::opt<bool> SizeSort("size-sort", cl::desc("Sort symbols by size"));
cl::opt<bool> WithoutAliases("without-aliases", cl::Hidden,
cl::desc("Exclude aliases from output"));
cl::opt<bool> ArchiveMap("print-armap", cl::desc("Print the archive map"));
cl::alias ArchiveMaps("M", cl::desc("Alias for --print-armap"),
cl::aliasopt(ArchiveMap));
cl::opt<bool> JustSymbolName("just-symbol-name",
cl::desc("Print just the symbol's name"));
cl::alias JustSymbolNames("j", cl::desc("Alias for --just-symbol-name"),
cl::aliasopt(JustSymbolName));
// FIXME: This option takes exactly two strings and should be allowed anywhere
// on the command line. Such that "llvm-nm -s __TEXT __text foo.o" would work.
// But that does not as the CommandLine Library does not have a way to make
// this work. For now the "-s __TEXT __text" has to be last on the command
// line.
cl::list<std::string> SegSect("s", cl::Positional, cl::ZeroOrMore,
cl::desc("Dump only symbols from this segment "
"and section name, Mach-O only"));
cl::opt<bool> FormatMachOasHex("x", cl::desc("Print symbol entry in hex, "
"Mach-O only"));
cl::opt<bool> NoLLVMBitcode("no-llvm-bc",
cl::desc("Disable LLVM bitcode reader"));
bool PrintAddress = true;
bool MultipleFiles = false;
bool HadError = false;
std::string ToolName;
}
static void error(Twine Message, Twine Path = Twine()) {
HadError = true;
errs() << ToolName << ": " << Path << ": " << Message << ".\n";
}
static bool error(std::error_code EC, Twine Path = Twine()) {
if (EC) {
error(EC.message(), Path);
return true;
}
return false;
}
namespace {
struct NMSymbol {
uint64_t Address;
uint64_t Size;
char TypeChar;
StringRef Name;
DataRefImpl Symb;
};
}
static bool compareSymbolAddress(const NMSymbol &A, const NMSymbol &B) {
if (!ReverseSort) {
if (A.Address < B.Address)
return true;
if (A.Address == B.Address && A.Name < B.Name)
return true;
if (A.Address == B.Address && A.Name == B.Name && A.Size < B.Size)
return true;
return false;
}
if (A.Address > B.Address)
return true;
if (A.Address == B.Address && A.Name > B.Name)
return true;
if (A.Address == B.Address && A.Name == B.Name && A.Size > B.Size)
return true;
return false;
}
static bool compareSymbolSize(const NMSymbol &A, const NMSymbol &B) {
if (!ReverseSort) {
if (A.Size < B.Size)
return true;
if (A.Size == B.Size && A.Name < B.Name)
return true;
if (A.Size == B.Size && A.Name == B.Name && A.Address < B.Address)
return true;
return false;
}
if (A.Size > B.Size)
return true;
if (A.Size == B.Size && A.Name > B.Name)
return true;
if (A.Size == B.Size && A.Name == B.Name && A.Address > B.Address)
return true;
return false;
}
static bool compareSymbolName(const NMSymbol &A, const NMSymbol &B) {
if (!ReverseSort) {
if (A.Name < B.Name)
return true;
if (A.Name == B.Name && A.Size < B.Size)
return true;
if (A.Name == B.Name && A.Size == B.Size && A.Address < B.Address)
return true;
return false;
}
if (A.Name > B.Name)
return true;
if (A.Name == B.Name && A.Size > B.Size)
return true;
if (A.Name == B.Name && A.Size == B.Size && A.Address > B.Address)
return true;
return false;
}
static char isSymbolList64Bit(SymbolicFile &Obj) {
if (isa<IRObjectFile>(Obj))
return false;
if (isa<COFFObjectFile>(Obj))
return false;
if (MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(&Obj))
return MachO->is64Bit();
if (isa<ELF32LEObjectFile>(Obj))
return false;
if (isa<ELF64LEObjectFile>(Obj))
return true;
if (isa<ELF32BEObjectFile>(Obj))
return false;
if (isa<ELF64BEObjectFile>(Obj))
return true;
return false;
}
static StringRef CurrentFilename;
typedef std::vector<NMSymbol> SymbolListT;
static SymbolListT SymbolList;
// darwinPrintSymbol() is used to print a symbol from a Mach-O file when the
// the OutputFormat is darwin or we are printing Mach-O symbols in hex. For
// the darwin format it produces the same output as darwin's nm(1) -m output
// and when printing Mach-O symbols in hex it produces the same output as
// darwin's nm(1) -x format.
static void darwinPrintSymbol(MachOObjectFile *MachO, SymbolListT::iterator I,
char *SymbolAddrStr, const char *printBlanks) {
MachO::mach_header H;
MachO::mach_header_64 H_64;
uint32_t Filetype, Flags;
MachO::nlist_64 STE_64;
MachO::nlist STE;
uint8_t NType;
uint8_t NSect;
uint16_t NDesc;
uint32_t NStrx;
uint64_t NValue;
if (MachO->is64Bit()) {
H_64 = MachO->MachOObjectFile::getHeader64();
Filetype = H_64.filetype;
Flags = H_64.flags;
STE_64 = MachO->getSymbol64TableEntry(I->Symb);
NType = STE_64.n_type;
NSect = STE_64.n_sect;
NDesc = STE_64.n_desc;
NStrx = STE_64.n_strx;
NValue = STE_64.n_value;
} else {
H = MachO->MachOObjectFile::getHeader();
Filetype = H.filetype;
Flags = H.flags;
STE = MachO->getSymbolTableEntry(I->Symb);
NType = STE.n_type;
NSect = STE.n_sect;
NDesc = STE.n_desc;
NStrx = STE.n_strx;
NValue = STE.n_value;
}
// If we are printing Mach-O symbols in hex do that and return.
if (FormatMachOasHex) {
char Str[18] = "";
const char *printFormat;
if (MachO->is64Bit())
printFormat = "%016" PRIx64;
else
printFormat = "%08" PRIx64;
format(printFormat, NValue).print(Str, sizeof(Str));
outs() << Str << ' ';
format("%02x", NType).print(Str, sizeof(Str));
outs() << Str << ' ';
format("%02x", NSect).print(Str, sizeof(Str));
outs() << Str << ' ';
format("%04x", NDesc).print(Str, sizeof(Str));
outs() << Str << ' ';
format("%08x", NStrx).print(Str, sizeof(Str));
outs() << Str << ' ';
outs() << I->Name << "\n";
return;
}
if (PrintAddress) {
if ((NType & MachO::N_TYPE) == MachO::N_INDR)
strcpy(SymbolAddrStr, printBlanks);
outs() << SymbolAddrStr << ' ';
}
switch (NType & MachO::N_TYPE) {
case MachO::N_UNDF:
if (NValue != 0) {
outs() << "(common) ";
if (MachO::GET_COMM_ALIGN(NDesc) != 0)
outs() << "(alignment 2^" << (int)MachO::GET_COMM_ALIGN(NDesc) << ") ";
} else {
if ((NType & MachO::N_TYPE) == MachO::N_PBUD)
outs() << "(prebound ";
else
outs() << "(";
if ((NDesc & MachO::REFERENCE_TYPE) ==
MachO::REFERENCE_FLAG_UNDEFINED_LAZY)
outs() << "undefined [lazy bound]) ";
else if ((NDesc & MachO::REFERENCE_TYPE) ==
MachO::REFERENCE_FLAG_UNDEFINED_LAZY)
outs() << "undefined [private lazy bound]) ";
else if ((NDesc & MachO::REFERENCE_TYPE) ==
MachO::REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY)
outs() << "undefined [private]) ";
else
outs() << "undefined) ";
}
break;
case MachO::N_ABS:
outs() << "(absolute) ";
break;
case MachO::N_INDR:
outs() << "(indirect) ";
break;
case MachO::N_SECT: {
section_iterator Sec = MachO->section_end();
MachO->getSymbolSection(I->Symb, Sec);
DataRefImpl Ref = Sec->getRawDataRefImpl();
StringRef SectionName;
MachO->getSectionName(Ref, SectionName);
StringRef SegmentName = MachO->getSectionFinalSegmentName(Ref);
outs() << "(" << SegmentName << "," << SectionName << ") ";
break;
}
default:
outs() << "(?) ";
break;
}
if (NType & MachO::N_EXT) {
if (NDesc & MachO::REFERENCED_DYNAMICALLY)
outs() << "[referenced dynamically] ";
if (NType & MachO::N_PEXT) {
if ((NDesc & MachO::N_WEAK_DEF) == MachO::N_WEAK_DEF)
outs() << "weak private external ";
else
outs() << "private external ";
} else {
if ((NDesc & MachO::N_WEAK_REF) == MachO::N_WEAK_REF ||
(NDesc & MachO::N_WEAK_DEF) == MachO::N_WEAK_DEF) {
if ((NDesc & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF)) ==
(MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
outs() << "weak external automatically hidden ";
else
outs() << "weak external ";
} else
outs() << "external ";
}
} else {
if (NType & MachO::N_PEXT)
outs() << "non-external (was a private external) ";
else
outs() << "non-external ";
}
if (Filetype == MachO::MH_OBJECT &&
(NDesc & MachO::N_NO_DEAD_STRIP) == MachO::N_NO_DEAD_STRIP)
outs() << "[no dead strip] ";
if (Filetype == MachO::MH_OBJECT &&
((NType & MachO::N_TYPE) != MachO::N_UNDF) &&
(NDesc & MachO::N_SYMBOL_RESOLVER) == MachO::N_SYMBOL_RESOLVER)
outs() << "[symbol resolver] ";
if (Filetype == MachO::MH_OBJECT &&
((NType & MachO::N_TYPE) != MachO::N_UNDF) &&
(NDesc & MachO::N_ALT_ENTRY) == MachO::N_ALT_ENTRY)
outs() << "[alt entry] ";
if ((NDesc & MachO::N_ARM_THUMB_DEF) == MachO::N_ARM_THUMB_DEF)
outs() << "[Thumb] ";
if ((NType & MachO::N_TYPE) == MachO::N_INDR) {
outs() << I->Name << " (for ";
StringRef IndirectName;
if (MachO->getIndirectName(I->Symb, IndirectName))
outs() << "?)";
else
outs() << IndirectName << ")";
} else
outs() << I->Name;
if ((Flags & MachO::MH_TWOLEVEL) == MachO::MH_TWOLEVEL &&
(((NType & MachO::N_TYPE) == MachO::N_UNDF && NValue == 0) ||
(NType & MachO::N_TYPE) == MachO::N_PBUD)) {
uint32_t LibraryOrdinal = MachO::GET_LIBRARY_ORDINAL(NDesc);
if (LibraryOrdinal != 0) {
if (LibraryOrdinal == MachO::EXECUTABLE_ORDINAL)
outs() << " (from executable)";
else if (LibraryOrdinal == MachO::DYNAMIC_LOOKUP_ORDINAL)
outs() << " (dynamically looked up)";
else {
StringRef LibraryName;
if (MachO->getLibraryShortNameByIndex(LibraryOrdinal - 1, LibraryName))
outs() << " (from bad library ordinal " << LibraryOrdinal << ")";
else
outs() << " (from " << LibraryName << ")";
}
}
}
outs() << "\n";
}
// Table that maps Darwin's Mach-O stab constants to strings to allow printing.
struct DarwinStabName {
uint8_t NType;
const char *Name;
};
static const struct DarwinStabName DarwinStabNames[] = {
{MachO::N_GSYM, "GSYM"},
{MachO::N_FNAME, "FNAME"},
{MachO::N_FUN, "FUN"},
{MachO::N_STSYM, "STSYM"},
{MachO::N_LCSYM, "LCSYM"},
{MachO::N_BNSYM, "BNSYM"},
{MachO::N_PC, "PC"},
{MachO::N_AST, "AST"},
{MachO::N_OPT, "OPT"},
{MachO::N_RSYM, "RSYM"},
{MachO::N_SLINE, "SLINE"},
{MachO::N_ENSYM, "ENSYM"},
{MachO::N_SSYM, "SSYM"},
{MachO::N_SO, "SO"},
{MachO::N_OSO, "OSO"},
{MachO::N_LSYM, "LSYM"},
{MachO::N_BINCL, "BINCL"},
{MachO::N_SOL, "SOL"},
{MachO::N_PARAMS, "PARAM"},
{MachO::N_VERSION, "VERS"},
{MachO::N_OLEVEL, "OLEV"},
{MachO::N_PSYM, "PSYM"},
{MachO::N_EINCL, "EINCL"},
{MachO::N_ENTRY, "ENTRY"},
{MachO::N_LBRAC, "LBRAC"},
{MachO::N_EXCL, "EXCL"},
{MachO::N_RBRAC, "RBRAC"},
{MachO::N_BCOMM, "BCOMM"},
{MachO::N_ECOMM, "ECOMM"},
{MachO::N_ECOML, "ECOML"},
{MachO::N_LENG, "LENG"},
{0, 0}};
static const char *getDarwinStabString(uint8_t NType) {
for (unsigned i = 0; DarwinStabNames[i].Name; i++) {
if (DarwinStabNames[i].NType == NType)
return DarwinStabNames[i].Name;
}
return 0;
}
// darwinPrintStab() prints the n_sect, n_desc along with a symbolic name of
// a stab n_type value in a Mach-O file.
static void darwinPrintStab(MachOObjectFile *MachO, SymbolListT::iterator I) {
MachO::nlist_64 STE_64;
MachO::nlist STE;
uint8_t NType;
uint8_t NSect;
uint16_t NDesc;
if (MachO->is64Bit()) {
STE_64 = MachO->getSymbol64TableEntry(I->Symb);
NType = STE_64.n_type;
NSect = STE_64.n_sect;
NDesc = STE_64.n_desc;
} else {
STE = MachO->getSymbolTableEntry(I->Symb);
NType = STE.n_type;
NSect = STE.n_sect;
NDesc = STE.n_desc;
}
char Str[18] = "";
format("%02x", NSect).print(Str, sizeof(Str));
outs() << ' ' << Str << ' ';
format("%04x", NDesc).print(Str, sizeof(Str));
outs() << Str << ' ';
if (const char *stabString = getDarwinStabString(NType))
format("%5.5s", stabString).print(Str, sizeof(Str));
else
format(" %02x", NType).print(Str, sizeof(Str));
outs() << Str;
}
static void sortAndPrintSymbolList(SymbolicFile &Obj, bool printName,
std::string ArchiveName,
std::string ArchitectureName) {
if (!NoSort) {
if (NumericSort)
std::sort(SymbolList.begin(), SymbolList.end(), compareSymbolAddress);
else if (SizeSort)
std::sort(SymbolList.begin(), SymbolList.end(), compareSymbolSize);
else
std::sort(SymbolList.begin(), SymbolList.end(), compareSymbolName);
}
if (!PrintFileName) {
if (OutputFormat == posix && MultipleFiles && printName) {
outs() << '\n' << CurrentFilename << ":\n";
} else if (OutputFormat == bsd && MultipleFiles && printName) {
outs() << "\n" << CurrentFilename << ":\n";
} else if (OutputFormat == sysv) {
outs() << "\n\nSymbols from " << CurrentFilename << ":\n\n"
<< "Name Value Class Type"
<< " Size Line Section\n";
}
}
const char *printBlanks, *printFormat;
if (isSymbolList64Bit(Obj)) {
printBlanks = " ";
printFormat = "%016" PRIx64;
} else {
printBlanks = " ";
printFormat = "%08" PRIx64;
}
for (SymbolListT::iterator I = SymbolList.begin(), E = SymbolList.end();
I != E; ++I) {
if ((I->TypeChar != 'U') && UndefinedOnly)
continue;
if ((I->TypeChar == 'U') && DefinedOnly)
continue;
if (SizeSort && !PrintAddress && I->Size == UnknownAddressOrSize)
continue;
if (PrintFileName) {
if (!ArchitectureName.empty())
outs() << "(for architecture " << ArchitectureName << "):";
if (!ArchiveName.empty())
outs() << ArchiveName << ":";
outs() << CurrentFilename << ": ";
}
if (JustSymbolName || (UndefinedOnly && isa<MachOObjectFile>(Obj))) {
outs() << I->Name << "\n";
continue;
}
char SymbolAddrStr[18] = "";
char SymbolSizeStr[18] = "";
if (OutputFormat == sysv || I->Address == UnknownAddressOrSize)
strcpy(SymbolAddrStr, printBlanks);
if (OutputFormat == sysv)
strcpy(SymbolSizeStr, printBlanks);
if (I->Address != UnknownAddressOrSize)
format(printFormat, I->Address)
.print(SymbolAddrStr, sizeof(SymbolAddrStr));
if (I->Size != UnknownAddressOrSize)
format(printFormat, I->Size).print(SymbolSizeStr, sizeof(SymbolSizeStr));
// If OutputFormat is darwin or we are printing Mach-O symbols in hex and
// we have a MachOObjectFile, call darwinPrintSymbol to print as darwin's
// nm(1) -m output or hex, else if OutputFormat is darwin or we are
// printing Mach-O symbols in hex and not a Mach-O object fall back to
// OutputFormat bsd (see below).
MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(&Obj);
if ((OutputFormat == darwin || FormatMachOasHex) && MachO) {
darwinPrintSymbol(MachO, I, SymbolAddrStr, printBlanks);
} else if (OutputFormat == posix) {
outs() << I->Name << " " << I->TypeChar << " " << SymbolAddrStr
<< SymbolSizeStr << "\n";
} else if (OutputFormat == bsd || (OutputFormat == darwin && !MachO)) {
if (PrintAddress)
outs() << SymbolAddrStr << ' ';
if (PrintSize) {
outs() << SymbolSizeStr;
if (I->Size != UnknownAddressOrSize)
outs() << ' ';
}
outs() << I->TypeChar;
if (I->TypeChar == '-' && MachO)
darwinPrintStab(MachO, I);
outs() << " " << I->Name << "\n";
} else if (OutputFormat == sysv) {
std::string PaddedName(I->Name);
while (PaddedName.length() < 20)
PaddedName += " ";
outs() << PaddedName << "|" << SymbolAddrStr << "| " << I->TypeChar
<< " | |" << SymbolSizeStr << "| |\n";
}
}
SymbolList.clear();
}
template <class ELFT>
static char getSymbolNMTypeChar(ELFObjectFile<ELFT> &Obj,
basic_symbol_iterator I) {
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
typedef typename ELFObjectFile<ELFT>::Elf_Shdr Elf_Shdr;
// OK, this is ELF
symbol_iterator SymI(I);
DataRefImpl Symb = I->getRawDataRefImpl();
const Elf_Sym *ESym = Obj.getSymbol(Symb);
const ELFFile<ELFT> &EF = *Obj.getELFFile();
const Elf_Shdr *ESec = EF.getSection(ESym);
if (ESec) {
switch (ESec->sh_type) {
case ELF::SHT_PROGBITS:
case ELF::SHT_DYNAMIC:
switch (ESec->sh_flags) {
case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR):
return 't';
case (ELF::SHF_TLS | ELF::SHF_ALLOC | ELF::SHF_WRITE):
case (ELF::SHF_ALLOC | ELF::SHF_WRITE):
return 'd';
case ELF::SHF_ALLOC:
case (ELF::SHF_ALLOC | ELF::SHF_MERGE):
case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS):
return 'r';
}
break;
case ELF::SHT_NOBITS:
return 'b';
}
}
if (ESym->getType() == ELF::STT_SECTION) {
StringRef Name;
if (error(SymI->getName(Name)))
return '?';
return StringSwitch<char>(Name)
.StartsWith(".debug", 'N')
.StartsWith(".note", 'n')
.Default('?');
}
return '?';
}
static char getSymbolNMTypeChar(COFFObjectFile &Obj, symbol_iterator I) {
COFFSymbolRef Symb = Obj.getCOFFSymbol(*I);
// OK, this is COFF.
symbol_iterator SymI(I);
StringRef Name;
if (error(SymI->getName(Name)))
return '?';
char Ret = StringSwitch<char>(Name)
.StartsWith(".debug", 'N')
.StartsWith(".sxdata", 'N')
.Default('?');
if (Ret != '?')
return Ret;
uint32_t Characteristics = 0;
if (!COFF::isReservedSectionNumber(Symb.getSectionNumber())) {
section_iterator SecI = Obj.section_end();
if (error(SymI->getSection(SecI)))
return '?';
const coff_section *Section = Obj.getCOFFSection(*SecI);
Characteristics = Section->Characteristics;
}
switch (Symb.getSectionNumber()) {
case COFF::IMAGE_SYM_DEBUG:
return 'n';
default:
// Check section type.
if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
return 't';
if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
return Characteristics & COFF::IMAGE_SCN_MEM_WRITE ? 'd' : 'r';
if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
return 'b';
if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
return 'i';
// Check for section symbol.
if (Symb.isSectionDefinition())
return 's';
}
return '?';
}
static uint8_t getNType(MachOObjectFile &Obj, DataRefImpl Symb) {
if (Obj.is64Bit()) {
MachO::nlist_64 STE = Obj.getSymbol64TableEntry(Symb);
return STE.n_type;
}
MachO::nlist STE = Obj.getSymbolTableEntry(Symb);
return STE.n_type;
}
static char getSymbolNMTypeChar(MachOObjectFile &Obj, basic_symbol_iterator I) {
DataRefImpl Symb = I->getRawDataRefImpl();
uint8_t NType = getNType(Obj, Symb);
if (NType & MachO::N_STAB)
return '-';
switch (NType & MachO::N_TYPE) {
case MachO::N_ABS:
return 's';
case MachO::N_INDR:
return 'i';
case MachO::N_SECT: {
section_iterator Sec = Obj.section_end();
Obj.getSymbolSection(Symb, Sec);
DataRefImpl Ref = Sec->getRawDataRefImpl();
StringRef SectionName;
Obj.getSectionName(Ref, SectionName);
StringRef SegmentName = Obj.getSectionFinalSegmentName(Ref);
if (SegmentName == "__TEXT" && SectionName == "__text")
return 't';
else if (SegmentName == "__DATA" && SectionName == "__data")
return 'd';
else if (SegmentName == "__DATA" && SectionName == "__bss")
return 'b';
else
return 's';
}
}
return '?';
}
static char getSymbolNMTypeChar(const GlobalValue &GV) {
if (GV.getType()->getElementType()->isFunctionTy())
return 't';
// FIXME: should we print 'b'? At the IR level we cannot be sure if this
// will be in bss or not, but we could approximate.
return 'd';
}
static char getSymbolNMTypeChar(IRObjectFile &Obj, basic_symbol_iterator I) {
const GlobalValue *GV = Obj.getSymbolGV(I->getRawDataRefImpl());
if (!GV)
return 't';
return getSymbolNMTypeChar(*GV);
}
template <class ELFT>
static bool isELFObject(ELFObjectFile<ELFT> &Obj, symbol_iterator I) {
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
DataRefImpl Symb = I->getRawDataRefImpl();
const Elf_Sym *ESym = Obj.getSymbol(Symb);
return ESym->getType() == ELF::STT_OBJECT;
}
static bool isObject(SymbolicFile &Obj, basic_symbol_iterator I) {
if (ELF32LEObjectFile *ELF = dyn_cast<ELF32LEObjectFile>(&Obj))
return isELFObject(*ELF, I);
if (ELF64LEObjectFile *ELF = dyn_cast<ELF64LEObjectFile>(&Obj))
return isELFObject(*ELF, I);
if (ELF32BEObjectFile *ELF = dyn_cast<ELF32BEObjectFile>(&Obj))
return isELFObject(*ELF, I);
if (ELF64BEObjectFile *ELF = dyn_cast<ELF64BEObjectFile>(&Obj))
return isELFObject(*ELF, I);
return false;
}
static char getNMTypeChar(SymbolicFile &Obj, basic_symbol_iterator I) {
uint32_t Symflags = I->getFlags();
if ((Symflags & object::SymbolRef::SF_Weak) && !isa<MachOObjectFile>(Obj)) {
char Ret = isObject(Obj, I) ? 'v' : 'w';
if (!(Symflags & object::SymbolRef::SF_Undefined))
Ret = toupper(Ret);
return Ret;
}
if (Symflags & object::SymbolRef::SF_Undefined)
return 'U';
if (Symflags & object::SymbolRef::SF_Common)
return 'C';
char Ret = '?';
if (Symflags & object::SymbolRef::SF_Absolute)
Ret = 'a';
else if (IRObjectFile *IR = dyn_cast<IRObjectFile>(&Obj))
Ret = getSymbolNMTypeChar(*IR, I);
else if (COFFObjectFile *COFF = dyn_cast<COFFObjectFile>(&Obj))
Ret = getSymbolNMTypeChar(*COFF, I);
else if (MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(&Obj))
Ret = getSymbolNMTypeChar(*MachO, I);
else if (ELF32LEObjectFile *ELF = dyn_cast<ELF32LEObjectFile>(&Obj))
Ret = getSymbolNMTypeChar(*ELF, I);
else if (ELF64LEObjectFile *ELF = dyn_cast<ELF64LEObjectFile>(&Obj))
Ret = getSymbolNMTypeChar(*ELF, I);
else if (ELF32BEObjectFile *ELF = dyn_cast<ELF32BEObjectFile>(&Obj))
Ret = getSymbolNMTypeChar(*ELF, I);
else
Ret = getSymbolNMTypeChar(cast<ELF64BEObjectFile>(Obj), I);
if (Symflags & object::SymbolRef::SF_Global)
Ret = toupper(Ret);
return Ret;
}
// getNsectForSegSect() is used to implement the Mach-O "-s segname sectname"
// option to dump only those symbols from that section in a Mach-O file.
// It is called once for each Mach-O file from dumpSymbolNamesFromObject()
// to get the section number for that named section from the command line
// arguments. It returns the section number for that section in the Mach-O
// file or zero it is not present.
static unsigned getNsectForSegSect(MachOObjectFile *Obj) {
unsigned Nsect = 1;
for (section_iterator I = Obj->section_begin(), E = Obj->section_end();
I != E; ++I) {
DataRefImpl Ref = I->getRawDataRefImpl();
StringRef SectionName;
Obj->getSectionName(Ref, SectionName);
StringRef SegmentName = Obj->getSectionFinalSegmentName(Ref);
if (SegmentName == SegSect[0] && SectionName == SegSect[1])
return Nsect;
Nsect++;
}
return 0;
}
// getNsectInMachO() is used to implement the Mach-O "-s segname sectname"
// option to dump only those symbols from that section in a Mach-O file.
// It is called once for each symbol in a Mach-O file from
// dumpSymbolNamesFromObject() and returns the section number for that symbol
// if it is in a section, else it returns 0.
static unsigned getNsectInMachO(MachOObjectFile &Obj, basic_symbol_iterator I) {
DataRefImpl Symb = I->getRawDataRefImpl();
if (Obj.is64Bit()) {
MachO::nlist_64 STE = Obj.getSymbol64TableEntry(Symb);
if ((STE.n_type & MachO::N_TYPE) == MachO::N_SECT)
return STE.n_sect;
return 0;
}
MachO::nlist STE = Obj.getSymbolTableEntry(Symb);
if ((STE.n_type & MachO::N_TYPE) == MachO::N_SECT)
return STE.n_sect;
return 0;
}
static void dumpSymbolNamesFromObject(SymbolicFile &Obj, bool printName,
std::string ArchiveName = std::string(),
std::string ArchitectureName =
std::string()) {
basic_symbol_iterator IBegin = Obj.symbol_begin();
basic_symbol_iterator IEnd = Obj.symbol_end();
if (DynamicSyms) {
if (!Obj.isELF()) {
error("File format has no dynamic symbol table", Obj.getFileName());
return;
}
std::pair<symbol_iterator, symbol_iterator> IDyn =
getELFDynamicSymbolIterators(&Obj);
IBegin = IDyn.first;
IEnd = IDyn.second;
}
std::string NameBuffer;
raw_string_ostream OS(NameBuffer);
// If a "-s segname sectname" option was specified and this is a Mach-O
// file get the section number for that section in this object file.
unsigned int Nsect = 0;
MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(&Obj);
if (SegSect.size() != 0 && MachO) {
Nsect = getNsectForSegSect(MachO);
// If this section is not in the object file no symbols are printed.
if (Nsect == 0)
return;
}
for (basic_symbol_iterator I = IBegin; I != IEnd; ++I) {
uint32_t SymFlags = I->getFlags();
if (!DebugSyms && (SymFlags & SymbolRef::SF_FormatSpecific))
continue;
if (WithoutAliases) {
if (IRObjectFile *IR = dyn_cast<IRObjectFile>(&Obj)) {
const GlobalValue *GV = IR->getSymbolGV(I->getRawDataRefImpl());
if (GV && isa<GlobalAlias>(GV))
continue;
}
}
// If a "-s segname sectname" option was specified and this is a Mach-O
// file and this section appears in this file, Nsect will be non-zero then
// see if this symbol is a symbol from that section and if not skip it.
if (Nsect && Nsect != getNsectInMachO(*MachO, I))
continue;
NMSymbol S;
S.Size = UnknownAddressOrSize;
S.Address = UnknownAddressOrSize;
if ((PrintSize || SizeSort) && isa<ObjectFile>(Obj)) {
symbol_iterator SymI = I;
if (error(SymI->getSize(S.Size)))
break;
}
if (PrintAddress && isa<ObjectFile>(Obj))
if (error(symbol_iterator(I)->getAddress(S.Address)))
break;
S.TypeChar = getNMTypeChar(Obj, I);
if (error(I->printName(OS)))
break;
OS << '\0';
S.Symb = I->getRawDataRefImpl();
SymbolList.push_back(S);
}
OS.flush();
const char *P = NameBuffer.c_str();
for (unsigned I = 0; I < SymbolList.size(); ++I) {
SymbolList[I].Name = P;
P += strlen(P) + 1;
}
CurrentFilename = Obj.getFileName();
sortAndPrintSymbolList(Obj, printName, ArchiveName, ArchitectureName);
}
// checkMachOAndArchFlags() checks to see if the SymbolicFile is a Mach-O file
// and if it is and there is a list of architecture flags is specified then
// check to make sure this Mach-O file is one of those architectures or all
// architectures was specificed. If not then an error is generated and this
// routine returns false. Else it returns true.
static bool checkMachOAndArchFlags(SymbolicFile *O, std::string &Filename) {
MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(O);
if (!MachO || ArchAll || ArchFlags.size() == 0)
return true;
MachO::mach_header H;
MachO::mach_header_64 H_64;
Triple T;
if (MachO->is64Bit()) {
H_64 = MachO->MachOObjectFile::getHeader64();
T = MachOObjectFile::getArch(H_64.cputype, H_64.cpusubtype);
} else {
H = MachO->MachOObjectFile::getHeader();
T = MachOObjectFile::getArch(H.cputype, H.cpusubtype);
}
if (std::none_of(
ArchFlags.begin(), ArchFlags.end(),
[&](const std::string &Name) { return Name == T.getArchName(); })) {
error("No architecture specified", Filename);
return false;
}
return true;
}
static void dumpSymbolNamesFromFile(std::string &Filename) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
MemoryBuffer::getFileOrSTDIN(Filename);
if (error(BufferOrErr.getError(), Filename))
return;
LLVMContext &Context = getGlobalContext();
ErrorOr<std::unique_ptr<Binary>> BinaryOrErr = createBinary(
BufferOrErr.get()->getMemBufferRef(), NoLLVMBitcode ? nullptr : &Context);
if (error(BinaryOrErr.getError(), Filename))
return;
Binary &Bin = *BinaryOrErr.get();
if (Archive *A = dyn_cast<Archive>(&Bin)) {
if (ArchiveMap) {
Archive::symbol_iterator I = A->symbol_begin();
Archive::symbol_iterator E = A->symbol_end();
if (I != E) {
outs() << "Archive map\n";
for (; I != E; ++I) {
ErrorOr<Archive::child_iterator> C = I->getMember();
if (error(C.getError()))
return;
ErrorOr<StringRef> FileNameOrErr = C.get()->getName();
if (error(FileNameOrErr.getError()))
return;
StringRef SymName = I->getName();
outs() << SymName << " in " << FileNameOrErr.get() << "\n";
}
outs() << "\n";
}
}
for (Archive::child_iterator I = A->child_begin(), E = A->child_end();
I != E; ++I) {
ErrorOr<std::unique_ptr<Binary>> ChildOrErr = I->getAsBinary(&Context);
if (ChildOrErr.getError())
continue;
if (SymbolicFile *O = dyn_cast<SymbolicFile>(&*ChildOrErr.get())) {
if (!checkMachOAndArchFlags(O, Filename))
return;
if (!PrintFileName) {
outs() << "\n";
if (isa<MachOObjectFile>(O)) {
outs() << Filename << "(" << O->getFileName() << ")";
} else
outs() << O->getFileName();
outs() << ":\n";
}
dumpSymbolNamesFromObject(*O, false, Filename);
}
}
return;
}
if (MachOUniversalBinary *UB = dyn_cast<MachOUniversalBinary>(&Bin)) {
// If we have a list of architecture flags specified dump only those.
if (!ArchAll && ArchFlags.size() != 0) {
// Look for a slice in the universal binary that matches each ArchFlag.
bool ArchFound;
for (unsigned i = 0; i < ArchFlags.size(); ++i) {
ArchFound = false;
for (MachOUniversalBinary::object_iterator I = UB->begin_objects(),
E = UB->end_objects();
I != E; ++I) {
if (ArchFlags[i] == I->getArchTypeName()) {
ArchFound = true;
ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr =
I->getAsObjectFile();
std::string ArchiveName;
std::string ArchitectureName;
ArchiveName.clear();
ArchitectureName.clear();
if (ObjOrErr) {
ObjectFile &Obj = *ObjOrErr.get();
if (ArchFlags.size() > 1) {
if (PrintFileName)
ArchitectureName = I->getArchTypeName();
else
outs() << "\n" << Obj.getFileName() << " (for architecture "
<< I->getArchTypeName() << ")"
<< ":\n";
}
dumpSymbolNamesFromObject(Obj, false, ArchiveName,
ArchitectureName);
} else if (ErrorOr<std::unique_ptr<Archive>> AOrErr =
I->getAsArchive()) {
std::unique_ptr<Archive> &A = *AOrErr;
for (Archive::child_iterator AI = A->child_begin(),
AE = A->child_end();
AI != AE; ++AI) {
ErrorOr<std::unique_ptr<Binary>> ChildOrErr =
AI->getAsBinary(&Context);
if (ChildOrErr.getError())
continue;
if (SymbolicFile *O =
dyn_cast<SymbolicFile>(&*ChildOrErr.get())) {
if (PrintFileName) {
ArchiveName = A->getFileName();
if (ArchFlags.size() > 1)
ArchitectureName = I->getArchTypeName();
} else {
outs() << "\n" << A->getFileName();
outs() << "(" << O->getFileName() << ")";
if (ArchFlags.size() > 1) {
outs() << " (for architecture " << I->getArchTypeName()
<< ")";
}
outs() << ":\n";
}
dumpSymbolNamesFromObject(*O, false, ArchiveName,
ArchitectureName);
}
}
}
}
}
if (!ArchFound) {
error(ArchFlags[i],
"file: " + Filename + " does not contain architecture");
return;
}
}
return;
}
// No architecture flags were specified so if this contains a slice that
// matches the host architecture dump only that.
if (!ArchAll) {
StringRef HostArchName = MachOObjectFile::getHostArch().getArchName();
for (MachOUniversalBinary::object_iterator I = UB->begin_objects(),
E = UB->end_objects();
I != E; ++I) {
if (HostArchName == I->getArchTypeName()) {
ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr = I->getAsObjectFile();
std::string ArchiveName;
ArchiveName.clear();
if (ObjOrErr) {
ObjectFile &Obj = *ObjOrErr.get();
dumpSymbolNamesFromObject(Obj, false);
} else if (ErrorOr<std::unique_ptr<Archive>> AOrErr =
I->getAsArchive()) {
std::unique_ptr<Archive> &A = *AOrErr;
for (Archive::child_iterator AI = A->child_begin(),
AE = A->child_end();
AI != AE; ++AI) {
ErrorOr<std::unique_ptr<Binary>> ChildOrErr =
AI->getAsBinary(&Context);
if (ChildOrErr.getError())
continue;
if (SymbolicFile *O =
dyn_cast<SymbolicFile>(&*ChildOrErr.get())) {
if (PrintFileName)
ArchiveName = A->getFileName();
else
outs() << "\n" << A->getFileName() << "(" << O->getFileName()
<< ")"
<< ":\n";
dumpSymbolNamesFromObject(*O, false, ArchiveName);
}
}
}
return;
}
}
}
// Either all architectures have been specified or none have been specified
// and this does not contain the host architecture so dump all the slices.
bool moreThanOneArch = UB->getNumberOfObjects() > 1;
for (MachOUniversalBinary::object_iterator I = UB->begin_objects(),
E = UB->end_objects();
I != E; ++I) {
ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr = I->getAsObjectFile();
std::string ArchiveName;
std::string ArchitectureName;
ArchiveName.clear();
ArchitectureName.clear();
if (ObjOrErr) {
ObjectFile &Obj = *ObjOrErr.get();
if (PrintFileName) {
if (isa<MachOObjectFile>(Obj) && moreThanOneArch)
ArchitectureName = I->getArchTypeName();
} else {
if (moreThanOneArch)
outs() << "\n";
outs() << Obj.getFileName();
if (isa<MachOObjectFile>(Obj) && moreThanOneArch)
outs() << " (for architecture " << I->getArchTypeName() << ")";
outs() << ":\n";
}
dumpSymbolNamesFromObject(Obj, false, ArchiveName, ArchitectureName);
} else if (ErrorOr<std::unique_ptr<Archive>> AOrErr = I->getAsArchive()) {
std::unique_ptr<Archive> &A = *AOrErr;
for (Archive::child_iterator AI = A->child_begin(), AE = A->child_end();
AI != AE; ++AI) {
ErrorOr<std::unique_ptr<Binary>> ChildOrErr =
AI->getAsBinary(&Context);
if (ChildOrErr.getError())
continue;
if (SymbolicFile *O = dyn_cast<SymbolicFile>(&*ChildOrErr.get())) {
if (PrintFileName) {
ArchiveName = A->getFileName();
if (isa<MachOObjectFile>(O) && moreThanOneArch)
ArchitectureName = I->getArchTypeName();
} else {
outs() << "\n" << A->getFileName();
if (isa<MachOObjectFile>(O)) {
outs() << "(" << O->getFileName() << ")";
if (moreThanOneArch)
outs() << " (for architecture " << I->getArchTypeName()
<< ")";
} else
outs() << ":" << O->getFileName();
outs() << ":\n";
}
dumpSymbolNamesFromObject(*O, false, ArchiveName, ArchitectureName);
}
}
}
}
return;
}
if (SymbolicFile *O = dyn_cast<SymbolicFile>(&Bin)) {
if (!checkMachOAndArchFlags(O, Filename))
return;
dumpSymbolNamesFromObject(*O, true);
return;
}
error("unrecognizable file type", Filename);
return;
}
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 symbol table dumper\n");
// llvm-nm only reads binary files.
if (error(sys::ChangeStdinToBinary()))
return 1;
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
ToolName = argv[0];
if (BSDFormat)
OutputFormat = bsd;
if (POSIXFormat)
OutputFormat = posix;
if (DarwinFormat)
OutputFormat = darwin;
// The relative order of these is important. If you pass --size-sort it should
// only print out the size. However, if you pass -S --size-sort, it should
// print out both the size and address.
if (SizeSort && !PrintSize)
PrintAddress = false;
if (OutputFormat == sysv || SizeSort)
PrintSize = true;
switch (InputFilenames.size()) {
case 0:
InputFilenames.push_back("a.out");
case 1:
break;
default:
MultipleFiles = true;
}
for (unsigned i = 0; i < ArchFlags.size(); ++i) {
if (ArchFlags[i] == "all") {
ArchAll = true;
} else {
if (!MachOObjectFile::isValidArch(ArchFlags[i]))
error("Unknown architecture named '" + ArchFlags[i] + "'",
"for the -arch option");
}
}
if (SegSect.size() != 0 && SegSect.size() != 2)
error("bad number of arguments (must be two arguments)",
"for the -s option");
std::for_each(InputFilenames.begin(), InputFilenames.end(),
dumpSymbolNamesFromFile);
if (HadError)
return 1;
return 0;
}
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