1 //===-- cc1as_main.cpp - Clang Assembler ---------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This is the entry point to the clang -cc1as functionality, which implements
11 // the direct interface to the LLVM MC based assembler.
13 //===----------------------------------------------------------------------===//
15 #include "clang/Basic/Diagnostic.h"
16 #include "clang/Driver/Arg.h"
17 #include "clang/Driver/ArgList.h"
18 #include "clang/Driver/DriverDiagnostic.h"
19 #include "clang/Driver/CC1AsOptions.h"
20 #include "clang/Driver/OptTable.h"
21 #include "clang/Driver/Options.h"
22 #include "clang/Frontend/DiagnosticOptions.h"
23 #include "clang/Frontend/FrontendDiagnostic.h"
24 #include "clang/Frontend/TextDiagnosticPrinter.h"
25 #include "llvm/ADT/OwningPtr.h"
26 #include "llvm/ADT/StringSwitch.h"
27 #include "llvm/ADT/Triple.h"
28 #include "llvm/MC/MCParser/MCAsmParser.h"
29 #include "llvm/MC/MCAsmInfo.h"
30 #include "llvm/MC/MCCodeEmitter.h"
31 #include "llvm/MC/MCContext.h"
32 #include "llvm/MC/MCInstrInfo.h"
33 #include "llvm/MC/MCObjectFileInfo.h"
34 #include "llvm/MC/MCRegisterInfo.h"
35 #include "llvm/MC/MCStreamer.h"
36 #include "llvm/MC/MCSubtargetInfo.h"
37 #include "llvm/MC/MCAsmBackend.h"
38 #include "llvm/MC/MCTargetAsmParser.h"
39 #include "llvm/Support/CommandLine.h"
40 #include "llvm/Support/FormattedStream.h"
41 #include "llvm/Support/ErrorHandling.h"
42 #include "llvm/Support/ManagedStatic.h"
43 #include "llvm/Support/MemoryBuffer.h"
44 #include "llvm/Support/PrettyStackTrace.h"
45 #include "llvm/Support/SourceMgr.h"
46 #include "llvm/Support/Host.h"
47 #include "llvm/Support/Path.h"
48 #include "llvm/Support/Signals.h"
49 #include "llvm/Support/TargetRegistry.h"
50 #include "llvm/Support/TargetSelect.h"
51 #include "llvm/Support/Timer.h"
52 #include "llvm/Support/raw_ostream.h"
53 #include "llvm/Support/system_error.h"
54 #include "llvm/Target/TargetData.h"
55 using namespace clang;
56 using namespace clang::driver;
61 /// \brief Helper class for representing a single invocation of the assembler.
62 struct AssemblerInvocation {
63 /// @name Target Options
69 /// @name Language Options
72 std::vector<std::string> IncludePaths;
73 unsigned NoInitialTextSection : 1;
74 unsigned SaveTemporaryLabels : 1;
77 /// @name Frontend Options
80 std::string InputFile;
81 std::vector<std::string> LLVMArgs;
82 std::string OutputPath;
84 FT_Asm, ///< Assembly (.s) output, transliterate mode.
85 FT_Null, ///< No output, for timing purposes.
86 FT_Obj ///< Object file output.
89 unsigned ShowHelp : 1;
90 unsigned ShowVersion : 1;
93 /// @name Transliterate Options
96 unsigned OutputAsmVariant;
97 unsigned ShowEncoding : 1;
98 unsigned ShowInst : 1;
101 /// @name Assembler Options
104 unsigned RelaxAll : 1;
105 unsigned NoExecStack : 1;
110 AssemblerInvocation() {
112 NoInitialTextSection = 0;
116 OutputAsmVariant = 0;
123 static void CreateFromArgs(AssemblerInvocation &Res, const char **ArgBegin,
124 const char **ArgEnd, DiagnosticsEngine &Diags);
129 void AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
130 const char **ArgBegin,
132 DiagnosticsEngine &Diags) {
133 using namespace clang::driver::cc1asoptions;
134 // Parse the arguments.
135 OwningPtr<OptTable> OptTbl(createCC1AsOptTable());
136 unsigned MissingArgIndex, MissingArgCount;
137 OwningPtr<InputArgList> Args(
138 OptTbl->ParseArgs(ArgBegin, ArgEnd,MissingArgIndex, MissingArgCount));
140 // Check for missing argument error.
142 Diags.Report(diag::err_drv_missing_argument)
143 << Args->getArgString(MissingArgIndex) << MissingArgCount;
145 // Issue errors on unknown arguments.
146 for (arg_iterator it = Args->filtered_begin(cc1asoptions::OPT_UNKNOWN),
147 ie = Args->filtered_end(); it != ie; ++it)
148 Diags.Report(diag::err_drv_unknown_argument) << (*it) ->getAsString(*Args);
150 // Construct the invocation.
153 Opts.Triple = Triple::normalize(Args->getLastArgValue(OPT_triple));
154 if (Opts.Triple.empty()) // Use the host triple if unspecified.
155 Opts.Triple = sys::getHostTriple();
158 Opts.IncludePaths = Args->getAllArgValues(OPT_I);
159 Opts.NoInitialTextSection = Args->hasArg(OPT_n);
160 Opts.SaveTemporaryLabels = Args->hasArg(OPT_L);
163 if (Args->hasArg(OPT_INPUT)) {
165 for (arg_iterator it = Args->filtered_begin(OPT_INPUT),
166 ie = Args->filtered_end(); it != ie; ++it, First=false) {
169 Opts.InputFile = A->getValue(*Args);
171 Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(*Args);
174 Opts.LLVMArgs = Args->getAllArgValues(OPT_mllvm);
175 if (Args->hasArg(OPT_fatal_warnings))
176 Opts.LLVMArgs.push_back("-fatal-assembler-warnings");
177 Opts.OutputPath = Args->getLastArgValue(OPT_o);
178 if (Arg *A = Args->getLastArg(OPT_filetype)) {
179 StringRef Name = A->getValue(*Args);
180 unsigned OutputType = StringSwitch<unsigned>(Name)
182 .Case("null", FT_Null)
185 if (OutputType == ~0U)
186 Diags.Report(diag::err_drv_invalid_value)
187 << A->getAsString(*Args) << Name;
189 Opts.OutputType = FileType(OutputType);
191 Opts.ShowHelp = Args->hasArg(OPT_help);
192 Opts.ShowVersion = Args->hasArg(OPT_version);
194 // Transliterate Options
195 Opts.OutputAsmVariant = Args->getLastArgIntValue(OPT_output_asm_variant,
197 Opts.ShowEncoding = Args->hasArg(OPT_show_encoding);
198 Opts.ShowInst = Args->hasArg(OPT_show_inst);
201 Opts.RelaxAll = Args->hasArg(OPT_relax_all);
202 Opts.NoExecStack = Args->hasArg(OPT_no_exec_stack);
205 static formatted_raw_ostream *GetOutputStream(AssemblerInvocation &Opts,
206 DiagnosticsEngine &Diags,
208 if (Opts.OutputPath.empty())
209 Opts.OutputPath = "-";
211 // Make sure that the Out file gets unlinked from the disk if we get a
213 if (Opts.OutputPath != "-")
214 sys::RemoveFileOnSignal(sys::Path(Opts.OutputPath));
217 raw_fd_ostream *Out =
218 new raw_fd_ostream(Opts.OutputPath.c_str(), Error,
219 (Binary ? raw_fd_ostream::F_Binary : 0));
220 if (!Error.empty()) {
221 Diags.Report(diag::err_fe_unable_to_open_output)
222 << Opts.OutputPath << Error;
226 return new formatted_raw_ostream(*Out, formatted_raw_ostream::DELETE_STREAM);
229 static bool ExecuteAssembler(AssemblerInvocation &Opts,
230 DiagnosticsEngine &Diags) {
231 // Get the target specific parser.
233 const Target *TheTarget(TargetRegistry::lookupTarget(Opts.Triple, Error));
235 Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
239 OwningPtr<MemoryBuffer> BufferPtr;
240 if (error_code ec = MemoryBuffer::getFileOrSTDIN(Opts.InputFile, BufferPtr)) {
241 Error = ec.message();
242 Diags.Report(diag::err_fe_error_reading) << Opts.InputFile;
245 MemoryBuffer *Buffer = BufferPtr.take();
249 // Tell SrcMgr about this buffer, which is what the parser will pick up.
250 SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
252 // Record the location of the include directories so that the lexer can find
254 SrcMgr.setIncludeDirs(Opts.IncludePaths);
256 OwningPtr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(Opts.Triple));
257 assert(MAI && "Unable to create target asm info!");
259 OwningPtr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(Opts.Triple));
260 assert(MRI && "Unable to create target register info!");
262 bool IsBinary = Opts.OutputType == AssemblerInvocation::FT_Obj;
263 formatted_raw_ostream *Out = GetOutputStream(Opts, Diags, IsBinary);
267 // FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
268 // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
269 OwningPtr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
270 MCContext Ctx(*MAI, *MRI, MOFI.get());
271 // FIXME: Assembler behavior can change with -static.
272 MOFI->InitMCObjectFileInfo(Opts.Triple,
273 Reloc::Default, CodeModel::Default, Ctx);
274 if (Opts.SaveTemporaryLabels)
275 Ctx.setAllowTemporaryLabels(false);
277 OwningPtr<MCStreamer> Str;
279 OwningPtr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
280 OwningPtr<MCSubtargetInfo>
281 STI(TheTarget->createMCSubtargetInfo(Opts.Triple, "", ""));
283 // FIXME: There is a bit of code duplication with addPassesToEmitFile.
284 if (Opts.OutputType == AssemblerInvocation::FT_Asm) {
286 TheTarget->createMCInstPrinter(Opts.OutputAsmVariant, *MAI, *STI);
287 MCCodeEmitter *CE = 0;
288 MCAsmBackend *MAB = 0;
289 if (Opts.ShowEncoding) {
290 CE = TheTarget->createMCCodeEmitter(*MCII, *STI, Ctx);
291 MAB = TheTarget->createMCAsmBackend(Opts.Triple);
293 Str.reset(TheTarget->createAsmStreamer(Ctx, *Out, /*asmverbose*/true,
295 /*useCFI*/ true, IP, CE, MAB,
297 } else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
298 Str.reset(createNullStreamer(Ctx));
300 assert(Opts.OutputType == AssemblerInvocation::FT_Obj &&
301 "Invalid file type!");
302 MCCodeEmitter *CE = TheTarget->createMCCodeEmitter(*MCII, *STI, Ctx);
303 MCAsmBackend *MAB = TheTarget->createMCAsmBackend(Opts.Triple);
304 Str.reset(TheTarget->createMCObjectStreamer(Opts.Triple, Ctx, *MAB, *Out,
307 Str.get()->InitSections();
310 OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr, Ctx,
312 OwningPtr<MCTargetAsmParser> TAP(TheTarget->createMCAsmParser(*STI, *Parser));
314 Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
318 Parser->setTargetParser(*TAP.get());
320 bool Success = !Parser->Run(Opts.NoInitialTextSection);
325 // Delete output on errors.
326 if (!Success && Opts.OutputPath != "-")
327 sys::Path(Opts.OutputPath).eraseFromDisk();
332 static void LLVMErrorHandler(void *UserData, const std::string &Message) {
333 DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
335 Diags.Report(diag::err_fe_error_backend) << Message;
337 // We cannot recover from llvm errors.
341 int cc1as_main(const char **ArgBegin, const char **ArgEnd,
342 const char *Argv0, void *MainAddr) {
343 // Print a stack trace if we signal out.
344 sys::PrintStackTraceOnErrorSignal();
345 PrettyStackTraceProgram X(ArgEnd - ArgBegin, ArgBegin);
346 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
348 // Initialize targets and assembly printers/parsers.
349 InitializeAllTargetInfos();
350 InitializeAllTargetMCs();
351 InitializeAllAsmParsers();
353 // Construct our diagnostic client.
354 TextDiagnosticPrinter *DiagClient
355 = new TextDiagnosticPrinter(errs(), DiagnosticOptions());
356 DiagClient->setPrefix("clang -cc1as");
357 llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
358 DiagnosticsEngine Diags(DiagID, DiagClient);
360 // Set an error handler, so that any LLVM backend diagnostics go through our
362 ScopedFatalErrorHandler FatalErrorHandler
363 (LLVMErrorHandler, static_cast<void*>(&Diags));
365 // Parse the arguments.
366 AssemblerInvocation Asm;
367 AssemblerInvocation::CreateFromArgs(Asm, ArgBegin, ArgEnd, Diags);
371 llvm::OwningPtr<driver::OptTable> Opts(driver::createCC1AsOptTable());
372 Opts->PrintHelp(llvm::outs(), "clang -cc1as", "Clang Integrated Assembler");
378 // FIXME: Use a better -version message?
379 if (Asm.ShowVersion) {
380 llvm::cl::PrintVersionMessage();
386 // FIXME: Remove this, one day.
387 if (!Asm.LLVMArgs.empty()) {
388 unsigned NumArgs = Asm.LLVMArgs.size();
389 const char **Args = new const char*[NumArgs + 2];
390 Args[0] = "clang (LLVM option parsing)";
391 for (unsigned i = 0; i != NumArgs; ++i)
392 Args[i + 1] = Asm.LLVMArgs[i].c_str();
393 Args[NumArgs + 1] = 0;
394 llvm::cl::ParseCommandLineOptions(NumArgs + 1, const_cast<char **>(Args));
397 // Execute the invocation, unless there were parsing errors.
398 bool Success = false;
399 if (!Diags.hasErrorOccurred())
400 Success = ExecuteAssembler(Asm, Diags);
402 // If any timers were active but haven't been destroyed yet, print their
404 TimerGroup::printAll(errs());