tools/llvm-mc/llvm-mc.cpp

   1 //===-- llvm-mc.cpp - Machine Code Hacking Driver -------------------------===//
   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 utility is a simple driver that allows command line hacking on machine
  11 // code.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/MC/MCContext.h"
  16 #include "llvm/MC/MCSection.h"
  17 #include "llvm/MC/MCStreamer.h"
  18 #include "llvm/ADT/OwningPtr.h"
  19 #include "llvm/Support/CommandLine.h"
  20 #include "llvm/Support/ManagedStatic.h"
  21 #include "llvm/Support/MemoryBuffer.h"
  22 #include "llvm/Support/PrettyStackTrace.h"
  23 #include "llvm/Support/SourceMgr.h"
  24 #include "llvm/Support/raw_ostream.h"
  25 #include "llvm/System/Signals.h"
  26 #include "llvm/Target/TargetAsmParser.h"
  27 #include "llvm/Target/TargetRegistry.h"
  28 #include "llvm/Target/TargetSelect.h"
  29 #include "AsmParser.h"
  30 using namespace llvm;
  31
  32 static cl::opt<std::string>
  33 InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
  34
  35 static cl::opt<std::string>
  36 OutputFilename("o", cl::desc("Output filename"),
  37                cl::value_desc("filename"));
  38
  39 static cl::list<std::string>
  40 IncludeDirs("I", cl::desc("Directory of include files"),
  41             cl::value_desc("directory"), cl::Prefix);
  42
  43 static cl::opt<std::string>
  44 TripleName("triple", cl::desc("Target triple to assemble for,"
  45                           "see -version for available targets"),
  46        cl::init(LLVM_HOSTTRIPLE));
  47
  48 enum ActionType {
  49   AC_AsLex,
  50   AC_Assemble
  51 };
  52
  53 static cl::opt<ActionType>
  54 Action(cl::desc("Action to perform:"),
  55        cl::init(AC_Assemble),
  56        cl::values(clEnumValN(AC_AsLex, "as-lex",
  57                              "Lex tokens from a .s file"),
  58                   clEnumValN(AC_Assemble, "assemble",
  59                              "Assemble a .s file (default)"),
  60                   clEnumValEnd));
  61
  62 static int AsLexInput(const char *ProgName) {
  63   std::string ErrorMessage;
  64   MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
  65                                                       &ErrorMessage);
  66   if (Buffer == 0) {
  67     errs() << ProgName << ": ";
  68     if (ErrorMessage.size())
  69       errs() << ErrorMessage << "\n";
  70     else
  71       errs() << "input file didn't read correctly.\n";
  72     return 1;
  73   }
  74
  75   SourceMgr SrcMgr;
  76
  77   // Tell SrcMgr about this buffer, which is what TGParser will pick up.
  78   SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
  79
  80   // Record the location of the include directories so that the lexer can find
  81   // it later.
  82   SrcMgr.setIncludeDirs(IncludeDirs);
  83
  84   AsmLexer Lexer(SrcMgr);
  85
  86   bool Error = false;
  87
  88   while (Lexer.Lex().isNot(AsmToken::Eof)) {
  89     switch (Lexer.getKind()) {
  90     default:
  91       Lexer.PrintMessage(Lexer.getLoc(), "unknown token", "warning");
  92       Error = true;
  93       break;
  94     case AsmToken::Error:
  95       Error = true; // error already printed.
  96       break;
  97     case AsmToken::Identifier:
  98       outs() << "identifier: " << Lexer.getTok().getString() << '\n';
  99       break;
 100     case AsmToken::Register:
 101       outs() << "register: " << Lexer.getTok().getString() << '\n';
 102       break;
 103     case AsmToken::String:
 104       outs() << "string: " << Lexer.getTok().getString() << '\n';
 105       break;
 106     case AsmToken::Integer:
 107       outs() << "int: " << Lexer.getTok().getString() << '\n';
 108       break;
 109
 110     case AsmToken::Amp:            outs() << "Amp\n"; break;
 111     case AsmToken::AmpAmp:         outs() << "AmpAmp\n"; break;
 112     case AsmToken::Caret:          outs() << "Caret\n"; break;
 113     case AsmToken::Colon:          outs() << "Colon\n"; break;
 114     case AsmToken::Comma:          outs() << "Comma\n"; break;
 115     case AsmToken::Dollar:         outs() << "Dollar\n"; break;
 116     case AsmToken::EndOfStatement: outs() << "EndOfStatement\n"; break;
 117     case AsmToken::Eof:            outs() << "Eof\n"; break;
 118     case AsmToken::Equal:          outs() << "Equal\n"; break;
 119     case AsmToken::EqualEqual:     outs() << "EqualEqual\n"; break;
 120     case AsmToken::Exclaim:        outs() << "Exclaim\n"; break;
 121     case AsmToken::ExclaimEqual:   outs() << "ExclaimEqual\n"; break;
 122     case AsmToken::Greater:        outs() << "Greater\n"; break;
 123     case AsmToken::GreaterEqual:   outs() << "GreaterEqual\n"; break;
 124     case AsmToken::GreaterGreater: outs() << "GreaterGreater\n"; break;
 125     case AsmToken::LParen:         outs() << "LParen\n"; break;
 126     case AsmToken::Less:           outs() << "Less\n"; break;
 127     case AsmToken::LessEqual:      outs() << "LessEqual\n"; break;
 128     case AsmToken::LessGreater:    outs() << "LessGreater\n"; break;
 129     case AsmToken::LessLess:       outs() << "LessLess\n"; break;
 130     case AsmToken::Minus:          outs() << "Minus\n"; break;
 131     case AsmToken::Percent:        outs() << "Percent\n"; break;
 132     case AsmToken::Pipe:           outs() << "Pipe\n"; break;
 133     case AsmToken::PipePipe:       outs() << "PipePipe\n"; break;
 134     case AsmToken::Plus:           outs() << "Plus\n"; break;
 135     case AsmToken::RParen:         outs() << "RParen\n"; break;
 136     case AsmToken::Slash:          outs() << "Slash\n"; break;
 137     case AsmToken::Star:           outs() << "Star\n"; break;
 138     case AsmToken::Tilde:          outs() << "Tilde\n"; break;
 139     }
 140   }
 141
 142   return Error;
 143 }
 144
 145 static TargetAsmParser *GetTargetAsmParser(const char *ProgName,
 146                                            MCAsmParser &Parser) {
 147   // Get the target specific parser.
 148   std::string Error;
 149   const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
 150   if (TheTarget == 0) {
 151     errs() << ProgName << ": error: unable to get target for '" << TripleName
 152            << "', see --version and --triple.\n";
 153     return 0;
 154   }
 155
 156   if (TargetAsmParser *TAP = TheTarget->createAsmParser(Parser))
 157     return TAP;
 158
 159   errs() << ProgName
 160          << ": error: this target does not support assembly parsing.\n";
 161   return 0;
 162 }
 163
 164 static int AssembleInput(const char *ProgName) {
 165   std::string Error;
 166   MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename, &Error);
 167   if (Buffer == 0) {
 168     errs() << ProgName << ": ";
 169     if (Error.size())
 170       errs() << Error << "\n";
 171     else
 172       errs() << "input file didn't read correctly.\n";
 173     return 1;
 174   }
 175
 176   SourceMgr SrcMgr;
 177
 178   // Tell SrcMgr about this buffer, which is what TGParser will pick up.
 179   SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
 180
 181   // Record the location of the include directories so that the lexer can find
 182   // it later.
 183   SrcMgr.setIncludeDirs(IncludeDirs);
 184
 185   MCContext Ctx;
 186   OwningPtr<MCStreamer> Str(createAsmStreamer(Ctx, outs()));
 187
 188   // FIXME: Target hook & command line option for initial section.
 189   Str.get()->SwitchSection(MCSection::Create("__TEXT,__text,"
 190                                              "regular,pure_instructions",
 191                                              false,
 192                                             SectionKind::getText(),
 193                                              Ctx));
 194
 195   AsmParser Parser(SrcMgr, Ctx, *Str.get());
 196   OwningPtr<TargetAsmParser> TAP(GetTargetAsmParser(ProgName, Parser));
 197   if (!TAP)
 198     return 1;
 199   Parser.setTargetParser(*TAP.get());
 200   return Parser.Run();
 201 }
 202
 203
 204 int main(int argc, char **argv) {
 205   // Print a stack trace if we signal out.
 206   sys::PrintStackTraceOnErrorSignal();
 207   PrettyStackTraceProgram X(argc, argv);
 208   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 209
 210   // Initialize targets and assembly parsers.
 211   llvm::InitializeAllTargetInfos();
 212   llvm::InitializeAllAsmParsers();
 213
 214   cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
 215
 216   switch (Action) {
 217   default:
 218   case AC_AsLex:
 219     return AsLexInput(argv[0]);
 220   case AC_Assemble:
 221     return AssembleInput(argv[0]);
 222   }
 223
 224   return 0;
 225 }
 226