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/LLVMContext.h"
  20 #include "llvm/Module.h"
  21 #include "llvm/Bitcode/ReaderWriter.h"
  22 #include "llvm/Bitcode/Archive.h"
  23 #include "llvm/Support/CommandLine.h"
  24 #include "llvm/Support/ManagedStatic.h"
  25 #include "llvm/Support/MemoryBuffer.h"
  26 #include "llvm/Support/PrettyStackTrace.h"
  27 #include "llvm/Support/raw_ostream.h"
  28 #include "llvm/System/Signals.h"
  29 #include <algorithm>
  30 #include <cctype>
  31 #include <cerrno>
  32 #include <cstring>
  33 using namespace llvm;
  34
  35 namespace {
  36   enum OutputFormatTy { bsd, sysv, posix };
  37   cl::opt<OutputFormatTy>
  38   OutputFormat("format",
  39        cl::desc("Specify output format"),
  40          cl::values(clEnumVal(bsd,   "BSD format"),
  41                     clEnumVal(sysv,  "System V format"),
  42                     clEnumVal(posix, "POSIX.2 format"),
  43                     clEnumValEnd), cl::init(bsd));
  44   cl::alias OutputFormat2("f", cl::desc("Alias for --format"),
  45                           cl::aliasopt(OutputFormat));
  46
  47   cl::list<std::string>
  48   InputFilenames(cl::Positional, cl::desc("<input bitcode files>"),
  49                  cl::ZeroOrMore);
  50
  51   cl::opt<bool> UndefinedOnly("undefined-only",
  52                               cl::desc("Show only undefined symbols"));
  53   cl::alias UndefinedOnly2("u", cl::desc("Alias for --undefined-only"),
  54                            cl::aliasopt(UndefinedOnly));
  55
  56   cl::opt<bool> DefinedOnly("defined-only",
  57                             cl::desc("Show only defined symbols"));
  58
  59   cl::opt<bool> ExternalOnly("extern-only",
  60                              cl::desc("Show only external symbols"));
  61   cl::alias ExternalOnly2("g", cl::desc("Alias for --extern-only"),
  62                           cl::aliasopt(ExternalOnly));
  63
  64   cl::opt<bool> BSDFormat("B", cl::desc("Alias for --format=bsd"));
  65   cl::opt<bool> POSIXFormat("P", cl::desc("Alias for --format=posix"));
  66
  67   bool MultipleFiles = false;
  68
  69   std::string ToolName;
  70 }
  71
  72 static char TypeCharForSymbol(GlobalValue &GV) {
  73   if (GV.isDeclaration())                                  return 'U';
  74   if (GV.hasLinkOnceLinkage())                             return 'C';
  75   if (GV.hasCommonLinkage())                               return 'C';
  76   if (GV.hasWeakLinkage())                                 return 'W';
  77   if (isa<Function>(GV) && GV.hasInternalLinkage())        return 't';
  78   if (isa<Function>(GV))                                   return 'T';
  79   if (isa<GlobalVariable>(GV) && GV.hasInternalLinkage())  return 'd';
  80   if (isa<GlobalVariable>(GV))                             return 'D';
  81   if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(&GV)) {
  82     const GlobalValue *AliasedGV = GA->getAliasedGlobal();
  83     if (isa<Function>(AliasedGV))                          return 'T';
  84     if (isa<GlobalVariable>(AliasedGV))                    return 'D';
  85   }
  86                                                            return '?';
  87 }
  88
  89 static void DumpSymbolNameForGlobalValue(GlobalValue &GV) {
  90   // Private linkage and available_externally linkage don't exist in symtab.
  91   if (GV.hasPrivateLinkage() ||
  92       GV.hasLinkerPrivateLinkage() ||
  93       GV.hasLinkerPrivateWeakLinkage() ||
  94       GV.hasLinkerPrivateWeakDefAutoLinkage() ||
  95       GV.hasAvailableExternallyLinkage())
  96     return;
  97
  98   const std::string SymbolAddrStr = "        "; // Not used yet...
  99   char TypeChar = TypeCharForSymbol(GV);
 100   if ((TypeChar != 'U') && UndefinedOnly)
 101     return;
 102   if ((TypeChar == 'U') && DefinedOnly)
 103     return;
 104   if (GV.hasLocalLinkage () && ExternalOnly)
 105     return;
 106   if (OutputFormat == posix) {
 107     outs() << GV.getName () << " " << TypeCharForSymbol(GV) << " "
 108            << SymbolAddrStr << "\n";
 109   } else if (OutputFormat == bsd) {
 110     outs() << SymbolAddrStr << " " << TypeCharForSymbol(GV) << " "
 111            << GV.getName () << "\n";
 112   } else if (OutputFormat == sysv) {
 113     std::string PaddedName (GV.getName ());
 114     while (PaddedName.length () < 20)
 115       PaddedName += " ";
 116     outs() << PaddedName << "|" << SymbolAddrStr << "|   "
 117            << TypeCharForSymbol(GV)
 118            << "  |                  |      |     |\n";
 119   }
 120 }
 121
 122 static void DumpSymbolNamesFromModule(Module *M) {
 123   const std::string &Filename = M->getModuleIdentifier ();
 124   if (OutputFormat == posix && MultipleFiles) {
 125     outs() << Filename << ":\n";
 126   } else if (OutputFormat == bsd && MultipleFiles) {
 127     outs() << "\n" << Filename << ":\n";
 128   } else if (OutputFormat == sysv) {
 129     outs() << "\n\nSymbols from " << Filename << ":\n\n"
 130            << "Name                  Value   Class        Type"
 131            << "         Size   Line  Section\n";
 132   }
 133   std::for_each (M->begin(), M->end(), DumpSymbolNameForGlobalValue);
 134   std::for_each (M->global_begin(), M->global_end(),
 135                  DumpSymbolNameForGlobalValue);
 136   std::for_each (M->alias_begin(), M->alias_end(),
 137                  DumpSymbolNameForGlobalValue);
 138 }
 139
 140 static void DumpSymbolNamesFromFile(std::string &Filename) {
 141   LLVMContext &Context = getGlobalContext();
 142   std::string ErrorMessage;
 143   sys::Path aPath(Filename);
 144   // Note: Currently we do not support reading an archive from stdin.
 145   if (Filename == "-" || aPath.isBitcodeFile()) {
 146     std::auto_ptr<MemoryBuffer> Buffer(
 147                    MemoryBuffer::getFileOrSTDIN(Filename, &ErrorMessage));
 148     Module *Result = 0;
 149     if (Buffer.get())
 150       Result = ParseBitcodeFile(Buffer.get(), Context, &ErrorMessage);
 151
 152     if (Result) {
 153       DumpSymbolNamesFromModule(Result);
 154       delete Result;
 155     } else
 156       errs() << ToolName << ": " << Filename << ": " << ErrorMessage << "\n";
 157
 158   } else if (aPath.isArchive()) {
 159     std::string ErrMsg;
 160     Archive* archive = Archive::OpenAndLoad(sys::Path(Filename), Context,
 161                                             &ErrorMessage);
 162     if (!archive)
 163       errs() << ToolName << ": " << Filename << ": " << ErrorMessage << "\n";
 164     std::vector<Module *> Modules;
 165     if (archive->getAllModules(Modules, &ErrorMessage)) {
 166       errs() << ToolName << ": " << Filename << ": " << ErrorMessage << "\n";
 167       return;
 168     }
 169     MultipleFiles = true;
 170     std::for_each (Modules.begin(), Modules.end(), DumpSymbolNamesFromModule);
 171   } else {
 172     errs() << ToolName << ": " << Filename << ": "
 173            << "unrecognizable file type\n";
 174     return;
 175   }
 176 }
 177
 178 int main(int argc, char **argv) {
 179   // Print a stack trace if we signal out.
 180   sys::PrintStackTraceOnErrorSignal();
 181   PrettyStackTraceProgram X(argc, argv);
 182
 183   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 184   cl::ParseCommandLineOptions(argc, argv, "llvm symbol table dumper\n");
 185
 186   ToolName = argv[0];
 187   if (BSDFormat) OutputFormat = bsd;
 188   if (POSIXFormat) OutputFormat = posix;
 189
 190   switch (InputFilenames.size()) {
 191   case 0: InputFilenames.push_back("-");
 192   case 1: break;
 193   default: MultipleFiles = true;
 194   }
 195
 196   std::for_each(InputFilenames.begin(), InputFilenames.end(),
 197                 DumpSymbolNamesFromFile);
 198   return 0;
 199 }