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//===-- llvm-nm.cpp - Symbol table dumping utility for llvm ---------------===//
//
// This program is a utility that works like traditional Unix "nm",
// that is, it prints out the names of symbols in a bytecode 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 "Support/CommandLine.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/GlobalValue.h"
#include "llvm/Module.h"
#include <cctype>
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"), 0), 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 bytecode files>"),
cl::OneOrMore);
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> 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"));
bool MultipleFiles = false;
std::string ToolName;
};
char TypeCharForSymbol (GlobalValue &GV) {
if (GV.isExternal ()) return 'U';
if (GV.hasLinkOnceLinkage ()) 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';
return '?';
}
void DumpSymbolNameForGlobalValue (GlobalValue &GV) {
const std::string SymbolAddrStr = " "; // Not used yet...
char TypeChar = TypeCharForSymbol (GV);
if ((TypeChar != 'U') && UndefinedOnly)
return;
if ((TypeChar == 'U') && DefinedOnly)
return;
if (GV.hasInternalLinkage () && ExternalOnly)
return;
if (OutputFormat == posix) {
std::cout << GV.getName () << " " << TypeCharForSymbol (GV) << " "
<< SymbolAddrStr << "\n";
} else if (OutputFormat == bsd) {
std::cout << SymbolAddrStr << " " << TypeCharForSymbol (GV) << " "
<< GV.getName () << "\n";
} else if (OutputFormat == sysv) {
std::string PaddedName (GV.getName ());
while (PaddedName.length () < 20)
PaddedName += " ";
std::cout << PaddedName << "|" << SymbolAddrStr << "| "
<< TypeCharForSymbol (GV)
<< " | | | |\n";
}
}
void DumpSymbolNamesFromModule (Module *M) {
std::for_each (M->begin (), M->end (), DumpSymbolNameForGlobalValue);
std::for_each (M->gbegin (), M->gend (), DumpSymbolNameForGlobalValue);
}
void DumpSymbolNamesFromFile (std::string &Filename) {
std::string ErrorMessage;
Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
if (Result) {
if (OutputFormat == posix && MultipleFiles) {
std::cout << Filename << ":\n";
} else if (OutputFormat == bsd && MultipleFiles) {
std::cout << "\n" << Filename << ":\n";
} else if (OutputFormat == sysv) {
std::cout << "\n\nSymbols from " << Filename << ":\n\n"
<< "Name Value Class Type"
<< " Size Line Section\n";
}
DumpSymbolNamesFromModule (Result);
} else {
std::cerr << ToolName << ": " << Filename << ": " << ErrorMessage << "\n";
}
}
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm symbol table dumper\n");
ToolName = argv[0];
if (BSDFormat) OutputFormat = bsd;
if (POSIXFormat) OutputFormat = posix;
if (InputFilenames.size () != 1)
MultipleFiles = true;
std::for_each (InputFilenames.begin (), InputFilenames.end (),
DumpSymbolNamesFromFile);
return 0;
}
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