external/bsd/llvm/dist/clang/tools/driver/cc1as_main.cpp

   1 //===-- cc1as_main.cpp - Clang Assembler  ---------------------------------===//
   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 is the entry point to the clang -cc1as functionality, which implements
  11 // the direct interface to the LLVM MC based assembler.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "clang/Basic/Diagnostic.h"
  16 #include "clang/Basic/DiagnosticOptions.h"
  17 #include "clang/Driver/DriverDiagnostic.h"
  18 #include "clang/Driver/Options.h"
  19 #include "clang/Frontend/FrontendDiagnostic.h"
  20 #include "clang/Frontend/TextDiagnosticPrinter.h"
  21 #include "clang/Frontend/Utils.h"
  22 #include "llvm/ADT/StringSwitch.h"
  23 #include "llvm/ADT/Triple.h"
  24 #include "llvm/IR/DataLayout.h"
  25 #include "llvm/MC/MCAsmBackend.h"
  26 #include "llvm/MC/MCAsmInfo.h"
  27 #include "llvm/MC/MCCodeEmitter.h"
  28 #include "llvm/MC/MCContext.h"
  29 #include "llvm/MC/MCInstrInfo.h"
  30 #include "llvm/MC/MCObjectFileInfo.h"
  31 #include "llvm/MC/MCParser/MCAsmParser.h"
  32 #include "llvm/MC/MCRegisterInfo.h"
  33 #include "llvm/MC/MCStreamer.h"
  34 #include "llvm/MC/MCSubtargetInfo.h"
  35 #include "llvm/MC/MCTargetAsmParser.h"
  36 #include "llvm/MC/MCTargetOptions.h"
  37 #include "llvm/Option/Arg.h"
  38 #include "llvm/Option/ArgList.h"
  39 #include "llvm/Option/OptTable.h"
  40 #include "llvm/Support/CommandLine.h"
  41 #include "llvm/Support/ErrorHandling.h"
  42 #include "llvm/Support/FileSystem.h"
  43 #include "llvm/Support/FormattedStream.h"
  44 #include "llvm/Support/Host.h"
  45 #include "llvm/Support/ManagedStatic.h"
  46 #include "llvm/Support/MemoryBuffer.h"
  47 #include "llvm/Support/Path.h"
  48 #include "llvm/Support/PrettyStackTrace.h"
  49 #include "llvm/Support/Signals.h"
  50 #include "llvm/Support/SourceMgr.h"
  51 #include "llvm/Support/TargetRegistry.h"
  52 #include "llvm/Support/TargetSelect.h"
  53 #include "llvm/Support/Timer.h"
  54 #include "llvm/Support/raw_ostream.h"
  55 #include <memory>
  56 #include <system_error>
  57 using namespace clang;
  58 using namespace clang::driver;
  59 using namespace clang::driver::options;
  60 using namespace llvm;
  61 using namespace llvm::opt;
  62
  63 namespace {
  64
  65 /// \brief Helper class for representing a single invocation of the assembler.
  66 struct AssemblerInvocation {
  67   /// @name Target Options
  68   /// @{
  69
  70   /// The name of the target triple to assemble for.
  71   std::string Triple;
  72
  73   /// If given, the name of the target CPU to determine which instructions
  74   /// are legal.
  75   std::string CPU;
  76
  77   /// The list of target specific features to enable or disable -- this should
  78   /// be a list of strings starting with '+' or '-'.
  79   std::vector<std::string> Features;
  80
  81   /// @}
  82   /// @name Language Options
  83   /// @{
  84
  85   std::vector<std::string> IncludePaths;
  86   unsigned NoInitialTextSection : 1;
  87   unsigned SaveTemporaryLabels : 1;
  88   unsigned GenDwarfForAssembly : 1;
  89   unsigned CompressDebugSections : 1;
  90   unsigned DwarfVersion;
  91   std::string DwarfDebugFlags;
  92   std::string DwarfDebugProducer;
  93   std::string DebugCompilationDir;
  94   std::string MainFileName;
  95
  96   /// @}
  97   /// @name Frontend Options
  98   /// @{
  99
 100   std::string InputFile;
 101   std::vector<std::string> LLVMArgs;
 102   std::string OutputPath;
 103   enum FileType {
 104     FT_Asm,  ///< Assembly (.s) output, transliterate mode.
 105     FT_Null, ///< No output, for timing purposes.
 106     FT_Obj   ///< Object file output.
 107   };
 108   FileType OutputType;
 109   unsigned ShowHelp : 1;
 110   unsigned ShowVersion : 1;
 111
 112   /// @}
 113   /// @name Transliterate Options
 114   /// @{
 115
 116   unsigned OutputAsmVariant;
 117   unsigned ShowEncoding : 1;
 118   unsigned ShowInst : 1;
 119
 120   /// @}
 121   /// @name Assembler Options
 122   /// @{
 123
 124   unsigned RelaxAll : 1;
 125   unsigned NoExecStack : 1;
 126   unsigned FatalWarnings : 1;
 127
 128   /// @}
 129
 130 public:
 131   AssemblerInvocation() {
 132     Triple = "";
 133     NoInitialTextSection = 0;
 134     InputFile = "-";
 135     OutputPath = "-";
 136     OutputType = FT_Asm;
 137     OutputAsmVariant = 0;
 138     ShowInst = 0;
 139     ShowEncoding = 0;
 140     RelaxAll = 0;
 141     NoExecStack = 0;
 142     FatalWarnings = 0;
 143     DwarfVersion = 3;
 144   }
 145
 146   static bool CreateFromArgs(AssemblerInvocation &Res,
 147                              ArrayRef<const char *> Argv,
 148                              DiagnosticsEngine &Diags);
 149 };
 150
 151 }
 152
 153 bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
 154                                          ArrayRef<const char *> Argv,
 155                                          DiagnosticsEngine &Diags) {
 156   bool Success = true;
 157
 158   // Parse the arguments.
 159   std::unique_ptr<OptTable> OptTbl(createDriverOptTable());
 160
 161   const unsigned IncludedFlagsBitmask = options::CC1AsOption;
 162   unsigned MissingArgIndex, MissingArgCount;
 163   std::unique_ptr<InputArgList> Args(
 164       OptTbl->ParseArgs(Argv.begin(), Argv.end(), MissingArgIndex, MissingArgCount,
 165                         IncludedFlagsBitmask));
 166
 167   // Check for missing argument error.
 168   if (MissingArgCount) {
 169     Diags.Report(diag::err_drv_missing_argument)
 170         << Args->getArgString(MissingArgIndex) << MissingArgCount;
 171     Success = false;
 172   }
 173
 174   // Issue errors on unknown arguments.
 175   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
 176                     ie = Args->filtered_end();
 177        it != ie; ++it) {
 178     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
 179     Success = false;
 180   }
 181
 182   // Construct the invocation.
 183
 184   // Target Options
 185   Opts.Triple = llvm::Triple::normalize(Args->getLastArgValue(OPT_triple));
 186   Opts.CPU = Args->getLastArgValue(OPT_target_cpu);
 187   Opts.Features = Args->getAllArgValues(OPT_target_feature);
 188
 189   // Use the default target triple if unspecified.
 190   if (Opts.Triple.empty())
 191     Opts.Triple = llvm::sys::getDefaultTargetTriple();
 192
 193   // Language Options
 194   Opts.IncludePaths = Args->getAllArgValues(OPT_I);
 195   Opts.NoInitialTextSection = Args->hasArg(OPT_n);
 196   Opts.SaveTemporaryLabels = Args->hasArg(OPT_msave_temp_labels);
 197   Opts.GenDwarfForAssembly = Args->hasArg(OPT_g_Flag);
 198   Opts.CompressDebugSections = Args->hasArg(OPT_compress_debug_sections);
 199   if (Args->hasArg(OPT_gdwarf_2))
 200     Opts.DwarfVersion = 2;
 201   if (Args->hasArg(OPT_gdwarf_3))
 202     Opts.DwarfVersion = 3;
 203   if (Args->hasArg(OPT_gdwarf_4))
 204     Opts.DwarfVersion = 4;
 205   Opts.DwarfDebugFlags = Args->getLastArgValue(OPT_dwarf_debug_flags);
 206   Opts.DwarfDebugProducer = Args->getLastArgValue(OPT_dwarf_debug_producer);
 207   Opts.DebugCompilationDir = Args->getLastArgValue(OPT_fdebug_compilation_dir);
 208   Opts.MainFileName = Args->getLastArgValue(OPT_main_file_name);
 209
 210   // Frontend Options
 211   if (Args->hasArg(OPT_INPUT)) {
 212     bool First = true;
 213     for (arg_iterator it = Args->filtered_begin(OPT_INPUT),
 214            ie = Args->filtered_end(); it != ie; ++it, First=false) {
 215       const Arg *A = it;
 216       if (First)
 217         Opts.InputFile = A->getValue();
 218       else {
 219         Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(*Args);
 220         Success = false;
 221       }
 222     }
 223   }
 224   Opts.LLVMArgs = Args->getAllArgValues(OPT_mllvm);
 225   Opts.OutputPath = Args->getLastArgValue(OPT_o);
 226   if (Arg *A = Args->getLastArg(OPT_filetype)) {
 227     StringRef Name = A->getValue();
 228     unsigned OutputType = StringSwitch<unsigned>(Name)
 229       .Case("asm", FT_Asm)
 230       .Case("null", FT_Null)
 231       .Case("obj", FT_Obj)
 232       .Default(~0U);
 233     if (OutputType == ~0U) {
 234       Diags.Report(diag::err_drv_invalid_value)
 235         << A->getAsString(*Args) << Name;
 236       Success = false;
 237     } else
 238       Opts.OutputType = FileType(OutputType);
 239   }
 240   Opts.ShowHelp = Args->hasArg(OPT_help);
 241   Opts.ShowVersion = Args->hasArg(OPT_version);
 242
 243   // Transliterate Options
 244   Opts.OutputAsmVariant =
 245       getLastArgIntValue(*Args.get(), OPT_output_asm_variant, 0, Diags);
 246   Opts.ShowEncoding = Args->hasArg(OPT_show_encoding);
 247   Opts.ShowInst = Args->hasArg(OPT_show_inst);
 248
 249   // Assemble Options
 250   Opts.RelaxAll = Args->hasArg(OPT_mrelax_all);
 251   Opts.NoExecStack = Args->hasArg(OPT_mno_exec_stack);
 252   Opts.FatalWarnings =  Args->hasArg(OPT_massembler_fatal_warnings);
 253
 254   return Success;
 255 }
 256
 257 static formatted_raw_ostream *GetOutputStream(AssemblerInvocation &Opts,
 258                                               DiagnosticsEngine &Diags,
 259                                               bool Binary) {
 260   if (Opts.OutputPath.empty())
 261     Opts.OutputPath = "-";
 262
 263   // Make sure that the Out file gets unlinked from the disk if we get a
 264   // SIGINT.
 265   if (Opts.OutputPath != "-")
 266     sys::RemoveFileOnSignal(Opts.OutputPath);
 267
 268   std::error_code EC;
 269   raw_fd_ostream *Out = new raw_fd_ostream(
 270       Opts.OutputPath, EC, (Binary ? sys::fs::F_None : sys::fs::F_Text));
 271   if (EC) {
 272     Diags.Report(diag::err_fe_unable_to_open_output) << Opts.OutputPath
 273                                                      << EC.message();
 274     delete Out;
 275     return nullptr;
 276   }
 277
 278   return new formatted_raw_ostream(*Out, formatted_raw_ostream::DELETE_STREAM);
 279 }
 280
 281 static bool ExecuteAssembler(AssemblerInvocation &Opts,
 282                              DiagnosticsEngine &Diags) {
 283   // Get the target specific parser.
 284   std::string Error;
 285   const Target *TheTarget = TargetRegistry::lookupTarget(Opts.Triple, Error);
 286   if (!TheTarget)
 287     return Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
 288
 289   ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer =
 290       MemoryBuffer::getFileOrSTDIN(Opts.InputFile);
 291
 292   if (std::error_code EC = Buffer.getError()) {
 293     Error = EC.message();
 294     return Diags.Report(diag::err_fe_error_reading) << Opts.InputFile;
 295   }
 296
 297   SourceMgr SrcMgr;
 298
 299   // Tell SrcMgr about this buffer, which is what the parser will pick up.
 300   SrcMgr.AddNewSourceBuffer(std::move(*Buffer), SMLoc());
 301
 302   // Record the location of the include directories so that the lexer can find
 303   // it later.
 304   SrcMgr.setIncludeDirs(Opts.IncludePaths);
 305
 306   std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(Opts.Triple));
 307   assert(MRI && "Unable to create target register info!");
 308
 309   std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, Opts.Triple));
 310   assert(MAI && "Unable to create target asm info!");
 311
 312   // Ensure MCAsmInfo initialization occurs before any use, otherwise sections
 313   // may be created with a combination of default and explicit settings.
 314   if (Opts.CompressDebugSections)
 315     MAI->setCompressDebugSections(true);
 316
 317   bool IsBinary = Opts.OutputType == AssemblerInvocation::FT_Obj;
 318   std::unique_ptr<formatted_raw_ostream> Out(
 319       GetOutputStream(Opts, Diags, IsBinary));
 320   if (!Out)
 321     return true;
 322
 323   // FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
 324   // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
 325   std::unique_ptr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
 326
 327   MCContext Ctx(MAI.get(), MRI.get(), MOFI.get(), &SrcMgr);
 328   // FIXME: Assembler behavior can change with -static.
 329   MOFI->InitMCObjectFileInfo(Opts.Triple,
 330                              Reloc::Default, CodeModel::Default, Ctx);
 331   if (Opts.SaveTemporaryLabels)
 332     Ctx.setAllowTemporaryLabels(false);
 333   if (Opts.GenDwarfForAssembly)
 334     Ctx.setGenDwarfForAssembly(true);
 335   if (!Opts.DwarfDebugFlags.empty())
 336     Ctx.setDwarfDebugFlags(StringRef(Opts.DwarfDebugFlags));
 337   if (!Opts.DwarfDebugProducer.empty())
 338     Ctx.setDwarfDebugProducer(StringRef(Opts.DwarfDebugProducer));
 339   if (!Opts.DebugCompilationDir.empty())
 340     Ctx.setCompilationDir(Opts.DebugCompilationDir);
 341   if (!Opts.MainFileName.empty())
 342     Ctx.setMainFileName(StringRef(Opts.MainFileName));
 343   Ctx.setDwarfVersion(Opts.DwarfVersion);
 344
 345   // Build up the feature string from the target feature list.
 346   std::string FS;
 347   if (!Opts.Features.empty()) {
 348     FS = Opts.Features[0];
 349     for (unsigned i = 1, e = Opts.Features.size(); i != e; ++i)
 350       FS += "," + Opts.Features[i];
 351   }
 352
 353   std::unique_ptr<MCStreamer> Str;
 354
 355   std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
 356   std::unique_ptr<MCSubtargetInfo> STI(
 357       TheTarget->createMCSubtargetInfo(Opts.Triple, Opts.CPU, FS));
 358
 359   // FIXME: There is a bit of code duplication with addPassesToEmitFile.
 360   if (Opts.OutputType == AssemblerInvocation::FT_Asm) {
 361     MCInstPrinter *IP =
 362       TheTarget->createMCInstPrinter(Opts.OutputAsmVariant, *MAI, *MCII, *MRI,
 363                                      *STI);
 364     MCCodeEmitter *CE = nullptr;
 365     MCAsmBackend *MAB = nullptr;
 366     if (Opts.ShowEncoding) {
 367       CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, *STI, Ctx);
 368       MAB = TheTarget->createMCAsmBackend(*MRI, Opts.Triple, Opts.CPU);
 369     }
 370     Str.reset(TheTarget->createAsmStreamer(Ctx, *Out, /*asmverbose*/true,
 371                                            /*useDwarfDirectory*/ true,
 372                                            IP, CE, MAB,
 373                                            Opts.ShowInst));
 374   } else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
 375     Str.reset(createNullStreamer(Ctx));
 376   } else {
 377     assert(Opts.OutputType == AssemblerInvocation::FT_Obj &&
 378            "Invalid file type!");
 379     MCCodeEmitter *CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, *STI, Ctx);
 380     MCAsmBackend *MAB = TheTarget->createMCAsmBackend(*MRI, Opts.Triple,
 381                                                       Opts.CPU);
 382     Str.reset(TheTarget->createMCObjectStreamer(Opts.Triple, Ctx, *MAB, *Out,
 383                                                 CE, *STI, Opts.RelaxAll));
 384     Str.get()->InitSections(Opts.NoExecStack);
 385   }
 386
 387   bool Failed = false;
 388
 389   std::unique_ptr<MCAsmParser> Parser(
 390       createMCAsmParser(SrcMgr, Ctx, *Str.get(), *MAI));
 391
 392   // FIXME: init MCTargetOptions from sanitizer flags here.
 393   MCTargetOptions Options;
 394   std::unique_ptr<MCTargetAsmParser> TAP(
 395       TheTarget->createMCAsmParser(*STI, *Parser, *MCII, Options));
 396   if (!TAP)
 397     Failed = Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
 398
 399   if (!Failed) {
 400     Parser->setTargetParser(*TAP.get());
 401     Failed = Parser->Run(Opts.NoInitialTextSection);
 402   }
 403
 404   // Close the output stream early.
 405   Out.reset();
 406
 407   // Delete output file if there were errors.
 408   if (Failed && Opts.OutputPath != "-")
 409     sys::fs::remove(Opts.OutputPath);
 410
 411   return Failed;
 412 }
 413
 414 static void LLVMErrorHandler(void *UserData, const std::string &Message,
 415                              bool GenCrashDiag) {
 416   DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
 417
 418   Diags.Report(diag::err_fe_error_backend) << Message;
 419
 420   // We cannot recover from llvm errors.
 421   exit(1);
 422 }
 423
 424 int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
 425   // Print a stack trace if we signal out.
 426   sys::PrintStackTraceOnErrorSignal();
 427   PrettyStackTraceProgram X(Argv.size(), Argv.data());
 428   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 429
 430   // Initialize targets and assembly printers/parsers.
 431   InitializeAllTargetInfos();
 432   InitializeAllTargetMCs();
 433   InitializeAllAsmParsers();
 434
 435   // Construct our diagnostic client.
 436   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
 437   TextDiagnosticPrinter *DiagClient
 438     = new TextDiagnosticPrinter(errs(), &*DiagOpts);
 439   DiagClient->setPrefix("clang -cc1as");
 440   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 441   DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
 442
 443   // Set an error handler, so that any LLVM backend diagnostics go through our
 444   // error handler.
 445   ScopedFatalErrorHandler FatalErrorHandler
 446     (LLVMErrorHandler, static_cast<void*>(&Diags));
 447
 448   // Parse the arguments.
 449   AssemblerInvocation Asm;
 450   if (!AssemblerInvocation::CreateFromArgs(Asm, Argv, Diags))
 451     return 1;
 452
 453   if (Asm.ShowHelp) {
 454     std::unique_ptr<OptTable> Opts(driver::createDriverOptTable());
 455     Opts->PrintHelp(llvm::outs(), "clang -cc1as", "Clang Integrated Assembler",
 456                     /*Include=*/driver::options::CC1AsOption, /*Exclude=*/0);
 457     return 0;
 458   }
 459
 460   // Honor -version.
 461   //
 462   // FIXME: Use a better -version message?
 463   if (Asm.ShowVersion) {
 464     llvm::cl::PrintVersionMessage();
 465     return 0;
 466   }
 467
 468   // Honor -mllvm.
 469   //
 470   // FIXME: Remove this, one day.
 471   if (!Asm.LLVMArgs.empty()) {
 472     unsigned NumArgs = Asm.LLVMArgs.size();
 473     const char **Args = new const char*[NumArgs + 2];
 474     Args[0] = "clang (LLVM option parsing)";
 475     for (unsigned i = 0; i != NumArgs; ++i)
 476       Args[i + 1] = Asm.LLVMArgs[i].c_str();
 477     Args[NumArgs + 1] = nullptr;
 478     llvm::cl::ParseCommandLineOptions(NumArgs + 1, Args);
 479   }
 480
 481   // Execute the invocation, unless there were parsing errors.
 482   bool Failed = Diags.hasErrorOccurred() || ExecuteAssembler(Asm, Diags);
 483
 484   // If any timers were active but haven't been destroyed yet, print their
 485   // results now.
 486   TimerGroup::printAll(errs());
 487
 488   return !!Failed;
 489 }
 490