llvm-nm.cpp
//===-- 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 file,
// along with some information about each symbol.
//
// This "nm" does not print symbols' addresses. It supports many of
// the features of GNU "nm", including its different output formats.
//
//===----------------------------------------------------------------------===//
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Bitcode/Archive.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/system_error.h"
#include <algorithm>
#include <cctype>
#include <cerrno>
#include <cstring>
#include <vector>
using namespace llvm;
using namespace object;
namespace {
enum OutputFormatTy { bsd, sysv, posix };
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"),
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 bitcode 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::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> 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> 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"));
bool PrintAddress = true;
bool MultipleFiles = false;
std::string ToolName;
}
static void error(Twine message, Twine path = Twine()) {
errs() << ToolName << ": " << path << ": " << message << ".\n";
}
static bool error(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;
};
static bool CompareSymbolAddress(const NMSymbol &a, const NMSymbol &b) {
if (a.Address < b.Address)
return true;
else if (a.Address == b.Address && a.Name < b.Name)
return true;
else
return false;
}
static bool CompareSymbolSize(const NMSymbol &a, const NMSymbol &b) {
if (a.Size < b.Size)
return true;
else if (a.Size == b.Size && a.Name < b.Name)
return true;
else
return false;
}
static bool CompareSymbolName(const NMSymbol &a, const NMSymbol &b) {
return a.Name < b.Name;
}
StringRef CurrentFilename;
typedef std::vector<NMSymbol> SymbolListT;
SymbolListT SymbolList;
}
static void SortAndPrintSymbolList() {
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 (OutputFormat == posix && MultipleFiles) {
outs() << '\n' << CurrentFilename << ":\n";
} else if (OutputFormat == bsd && MultipleFiles) {
outs() << "\n" << CurrentFilename << ":\n";
} else if (OutputFormat == sysv) {
outs() << "\n\nSymbols from " << CurrentFilename << ":\n\n"
<< "Name Value Class Type"
<< " Size Line Section\n";
}
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;
char SymbolAddrStr[10] = "";
char SymbolSizeStr[10] = "";
if (OutputFormat == sysv || i->Address == object::UnknownAddressOrSize)
strcpy(SymbolAddrStr, " ");
if (OutputFormat == sysv)
strcpy(SymbolSizeStr, " ");
if (i->Address != object::UnknownAddressOrSize)
format("%08" PRIx64, i->Address).print(SymbolAddrStr,
sizeof(SymbolAddrStr));
if (i->Size != object::UnknownAddressOrSize)
format("%08" PRIx64, i->Size).print(SymbolSizeStr, sizeof(SymbolSizeStr));
if (OutputFormat == posix) {
outs() << i->Name << " " << i->TypeChar << " "
<< SymbolAddrStr << SymbolSizeStr << "\n";
} else if (OutputFormat == bsd) {
if (PrintAddress)
outs() << SymbolAddrStr << ' ';
if (PrintSize) {
outs() << SymbolSizeStr;
if (i->Size != object::UnknownAddressOrSize)
outs() << ' ';
}
outs() << i->TypeChar << " " << 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();
}
static char TypeCharForSymbol(GlobalValue &GV) {
if (GV.isDeclaration()) return 'U';
if (GV.hasLinkOnceLinkage()) return 'C';
if (GV.hasCommonLinkage()) return 'C';
if (GV.hasWeakLinkage()) return 'W';
if (isa<Function>(GV) && GV.hasInternalLinkage()) return 't';
if (isa<Function>(GV)) return 'T';
if (isa<GlobalVariable>(GV) && GV.hasInternalLinkage()) return 'd';
if (isa<GlobalVariable>(GV)) return 'D';
if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(&GV)) {
const GlobalValue *AliasedGV = GA->getAliasedGlobal();
if (isa<Function>(AliasedGV)) return 'T';
if (isa<GlobalVariable>(AliasedGV)) return 'D';
}
return '?';
}
static void DumpSymbolNameForGlobalValue(GlobalValue &GV) {
// Private linkage and available_externally linkage don't exist in symtab.
if (GV.hasPrivateLinkage() ||
GV.hasLinkerPrivateLinkage() ||
GV.hasLinkerPrivateWeakLinkage() ||
GV.hasLinkerPrivateWeakDefAutoLinkage() ||
GV.hasAvailableExternallyLinkage())
return;
char TypeChar = TypeCharForSymbol(GV);
if (GV.hasLocalLinkage () && ExternalOnly)
return;
NMSymbol s;
s.Address = object::UnknownAddressOrSize;
s.Size = object::UnknownAddressOrSize;
s.TypeChar = TypeChar;
s.Name = GV.getName();
SymbolList.push_back(s);
}
static void DumpSymbolNamesFromModule(Module *M) {
CurrentFilename = M->getModuleIdentifier();
std::for_each (M->begin(), M->end(), DumpSymbolNameForGlobalValue);
std::for_each (M->global_begin(), M->global_end(),
DumpSymbolNameForGlobalValue);
std::for_each (M->alias_begin(), M->alias_end(),
DumpSymbolNameForGlobalValue);
SortAndPrintSymbolList();
}
static void DumpSymbolNamesFromObject(ObjectFile *obj) {
error_code ec;
symbol_iterator ibegin = obj->begin_symbols();
symbol_iterator iend = obj->end_symbols();
if (DynamicSyms) {
ibegin = obj->begin_dynamic_symbols();
iend = obj->end_dynamic_symbols();
}
for (symbol_iterator i = ibegin; i != iend; i.increment(ec)) {
if (error(ec)) break;
uint32_t symflags;
if (error(i->getFlags(symflags))) break;
if (!DebugSyms && (symflags & SymbolRef::SF_FormatSpecific))
continue;
NMSymbol s;
s.Size = object::UnknownAddressOrSize;
s.Address = object::UnknownAddressOrSize;
if (PrintSize || SizeSort) {
if (error(i->getSize(s.Size))) break;
}
if (PrintAddress)
if (error(i->getAddress(s.Address))) break;
if (error(i->getNMTypeChar(s.TypeChar))) break;
if (error(i->getName(s.Name))) break;
SymbolList.push_back(s);
}
CurrentFilename = obj->getFileName();
SortAndPrintSymbolList();
}
static void DumpSymbolNamesFromFile(std::string &Filename) {
if (Filename != "-" && !sys::fs::exists(Filename)) {
errs() << ToolName << ": '" << Filename << "': " << "No such file\n";
return;
}
OwningPtr<MemoryBuffer> Buffer;
if (error(MemoryBuffer::getFileOrSTDIN(Filename, Buffer), Filename))
return;
sys::fs::file_magic magic = sys::fs::identify_magic(Buffer->getBuffer());
LLVMContext &Context = getGlobalContext();
std::string ErrorMessage;
if (magic == sys::fs::file_magic::bitcode) {
Module *Result = 0;
Result = ParseBitcodeFile(Buffer.get(), Context, &ErrorMessage);
if (Result) {
DumpSymbolNamesFromModule(Result);
delete Result;
} else {
error(ErrorMessage, Filename);
return;
}
} else if (magic == sys::fs::file_magic::archive) {
OwningPtr<Binary> arch;
if (error(object::createBinary(Buffer.take(), arch), Filename))
return;
if (object::Archive *a = dyn_cast<object::Archive>(arch.get())) {
for (object::Archive::child_iterator i = a->begin_children(),
e = a->end_children(); i != e; ++i) {
OwningPtr<Binary> child;
if (i->getAsBinary(child)) {
// Try opening it as a bitcode file.
OwningPtr<MemoryBuffer> buff(i->getBuffer());
Module *Result = 0;
if (buff)
Result = ParseBitcodeFile(buff.get(), Context, &ErrorMessage);
if (Result) {
DumpSymbolNamesFromModule(Result);
delete Result;
}
continue;
}
if (object::ObjectFile *o = dyn_cast<ObjectFile>(child.get())) {
outs() << o->getFileName() << ":\n";
DumpSymbolNamesFromObject(o);
}
}
}
} else if (magic.is_object()) {
OwningPtr<Binary> obj;
if (error(object::createBinary(Buffer.take(), obj), Filename))
return;
if (object::ObjectFile *o = dyn_cast<ObjectFile>(obj.get()))
DumpSymbolNamesFromObject(o);
} else {
errs() << ToolName << ": " << Filename << ": "
<< "unrecognizable file type\n";
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::Program::ChangeStdinToBinary()))
return 1;
ToolName = argv[0];
if (BSDFormat) OutputFormat = bsd;
if (POSIXFormat) OutputFormat = posix;
// 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("-");
case 1: break;
default: MultipleFiles = true;
}
std::for_each(InputFilenames.begin(), InputFilenames.end(),
DumpSymbolNamesFromFile);
return 0;
}
