tools/llvm-nm/llvm-nm.cpp

   1 //===-- llvm-nm.cpp - Symbol table dumping utility for llvm ---------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This program is a utility that works like traditional Unix "nm",
  11 // that is, it prints out the names of symbols in a bitcode file,
  12 // along with some information about each symbol.
  13 //
  14 // This "nm" does not print symbols' addresses. It supports many of
  15 // the features of GNU "nm", including its different output formats.
  16 //
  17 //===----------------------------------------------------------------------===//
  18
  19 #include "llvm/Module.h"
  20 #include "llvm/Bitcode/ReaderWriter.h"
  21 #include "llvm/Bitcode/Archive.h"
  22 #include "llvm/Support/CommandLine.h"
  23 #include "llvm/Support/ManagedStatic.h"
  24 #include "llvm/Support/MemoryBuffer.h"
  25 #include "llvm/Support/PrettyStackTrace.h"
  26 #include "llvm/System/Signals.h"
  27 #include <algorithm>
  28 #include <cctype>
  29 #include <cerrno>
  30 #include <cstring>
  31 #include <iostream>
  32 using namespace llvm;
  33
  34 namespace {
  35   enum OutputFormatTy { bsd, sysv, posix };
  36   cl::opt<OutputFormatTy>
  37   OutputFormat("format",
  38        cl::desc("Specify output format"),
  39          cl::values(clEnumVal(bsd,   "BSD format"),
  40                     clEnumVal(sysv,  "System V format"),
  41                     clEnumVal(posix, "POSIX.2 format"),
  42                     clEnumValEnd), cl::init(bsd));
  43   cl::alias OutputFormat2("f", cl::desc("Alias for --format"),
  44                           cl::aliasopt(OutputFormat));
  45
  46   cl::list<std::string>
  47   InputFilenames(cl::Positional, cl::desc("<input bitcode files>"),
  48                  cl::ZeroOrMore);
  49
  50   cl::opt<bool> UndefinedOnly("undefined-only",
  51                               cl::desc("Show only undefined symbols"));
  52   cl::alias UndefinedOnly2("u", cl::desc("Alias for --undefined-only"),
  53                            cl::aliasopt(UndefinedOnly));
  54
  55   cl::opt<bool> DefinedOnly("defined-only",
  56                             cl::desc("Show only defined symbols"));
  57
  58   cl::opt<bool> ExternalOnly("extern-only",
  59                              cl::desc("Show only external symbols"));
  60   cl::alias ExternalOnly2("g", cl::desc("Alias for --extern-only"),
  61                           cl::aliasopt(ExternalOnly));
  62
  63   cl::opt<bool> BSDFormat("B", cl::desc("Alias for --format=bsd"));
  64   cl::opt<bool> POSIXFormat("P", cl::desc("Alias for --format=posix"));
  65
  66   bool MultipleFiles = false;
  67
  68   std::string ToolName;
  69 }
  70
  71 static char TypeCharForSymbol(GlobalValue &GV) {
  72   if (GV.isDeclaration())                                  return 'U';
  73   if (GV.hasLinkOnceLinkage())                             return 'C';
  74   if (GV.hasCommonLinkage())                               return 'C';
  75   if (GV.hasWeakLinkage())                                 return 'W';
  76   if (isa<Function>(GV) && GV.hasInternalLinkage())        return 't';
  77   if (isa<Function>(GV))                                   return 'T';
  78   if (isa<GlobalVariable>(GV) && GV.hasInternalLinkage())  return 'd';
  79   if (isa<GlobalVariable>(GV))                             return 'D';
  80   if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(&GV)) {
  81     const GlobalValue *AliasedGV = GA->getAliasedGlobal();
  82     if (isa<Function>(AliasedGV))                          return 'T';
  83     if (isa<GlobalVariable>(AliasedGV))                    return 'D';
  84   }
  85                                                            return '?';
  86 }
  87
  88 static void DumpSymbolNameForGlobalValue(GlobalValue &GV) {
  89   // Private linkage and available_externally linkage don't exist in symtab.
  90   if (GV.hasPrivateLinkage() || GV.hasAvailableExternallyLinkage()) return;
  91
  92   const std::string SymbolAddrStr = "        "; // Not used yet...
  93   char TypeChar = TypeCharForSymbol(GV);
  94   if ((TypeChar != 'U') && UndefinedOnly)
  95     return;
  96   if ((TypeChar == 'U') && DefinedOnly)
  97     return;
  98   if (GV.hasLocalLinkage () && ExternalOnly)
  99     return;
 100   if (OutputFormat == posix) {
 101     std::cout << GV.getName () << " " << TypeCharForSymbol(GV) << " "
 102               << SymbolAddrStr << "\n";
 103   } else if (OutputFormat == bsd) {
 104     std::cout << SymbolAddrStr << " " << TypeCharForSymbol(GV) << " "
 105               << GV.getName () << "\n";
 106   } else if (OutputFormat == sysv) {
 107     std::string PaddedName (GV.getName ());
 108     while (PaddedName.length () < 20)
 109       PaddedName += " ";
 110     std::cout << PaddedName << "|" << SymbolAddrStr << "|   "
 111               << TypeCharForSymbol(GV)
 112               << "  |                  |      |     |\n";
 113   }
 114 }
 115
 116 static void DumpSymbolNamesFromModule(Module *M) {
 117   const std::string &Filename = M->getModuleIdentifier ();
 118   if (OutputFormat == posix && MultipleFiles) {
 119     std::cout << Filename << ":\n";
 120   } else if (OutputFormat == bsd && MultipleFiles) {
 121     std::cout << "\n" << Filename << ":\n";
 122   } else if (OutputFormat == sysv) {
 123     std::cout << "\n\nSymbols from " << Filename << ":\n\n"
 124               << "Name                  Value   Class        Type"
 125               << "         Size   Line  Section\n";
 126   }
 127   std::for_each (M->begin(), M->end(), DumpSymbolNameForGlobalValue);
 128   std::for_each (M->global_begin(), M->global_end(),
 129                  DumpSymbolNameForGlobalValue);
 130   std::for_each (M->alias_begin(), M->alias_end(),
 131                  DumpSymbolNameForGlobalValue);
 132 }
 133
 134 static void DumpSymbolNamesFromFile(std::string &Filename) {
 135   std::string ErrorMessage;
 136   sys::Path aPath(Filename);
 137   // Note: Currently we do not support reading an archive from stdin.
 138   if (Filename == "-" || aPath.isBitcodeFile()) {
 139     std::auto_ptr<MemoryBuffer> Buffer(
 140                    MemoryBuffer::getFileOrSTDIN(Filename, &ErrorMessage));
 141     Module *Result = 0;
 142     if (Buffer.get())
 143       Result = ParseBitcodeFile(Buffer.get(), &ErrorMessage);
 144
 145     if (Result)
 146       DumpSymbolNamesFromModule(Result);
 147     else {
 148       std::cerr << ToolName << ": " << Filename << ": " << ErrorMessage << "\n";
 149       return;
 150     }
 151
 152   } else if (aPath.isArchive()) {
 153     std::string ErrMsg;
 154     Archive* archive = Archive::OpenAndLoad(sys::Path(Filename), &ErrorMessage);
 155     if (!archive)
 156       std::cerr << ToolName << ": " << Filename << ": " << ErrorMessage << "\n";
 157     std::vector<Module *> Modules;
 158     if (archive->getAllModules(Modules, &ErrorMessage)) {
 159       std::cerr << ToolName << ": " << Filename << ": " << ErrorMessage << "\n";
 160       return;
 161     }
 162     MultipleFiles = true;
 163     std::for_each (Modules.begin(), Modules.end(), DumpSymbolNamesFromModule);
 164   } else {
 165     std::cerr << ToolName << ": " << Filename << ": "
 166               << "unrecognizable file type\n";
 167     return;
 168   }
 169 }
 170
 171 int main(int argc, char **argv) {
 172   // Print a stack trace if we signal out.
 173   sys::PrintStackTraceOnErrorSignal();
 174   PrettyStackTraceProgram X(argc, argv);
 175
 176   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 177   cl::ParseCommandLineOptions(argc, argv, "llvm symbol table dumper\n");
 178
 179   ToolName = argv[0];
 180   if (BSDFormat) OutputFormat = bsd;
 181   if (POSIXFormat) OutputFormat = posix;
 182
 183   switch (InputFilenames.size()) {
 184   case 0: InputFilenames.push_back("-");
 185   case 1: break;
 186   default: MultipleFiles = true;
 187   }
 188
 189   std::for_each(InputFilenames.begin(), InputFilenames.end(),
 190                 DumpSymbolNamesFromFile);
 191   return 0;
 192 }