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1//===-- cc1as_main.cpp - Clang Assembler ---------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This is the entry point to the clang -cc1as functionality, which implements
10// the direct interface to the LLVM MC based assembler.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Basic/Diagnostic.h"
15#include "clang/Basic/DiagnosticOptions.h"
16#include "clang/Driver/DriverDiagnostic.h"
17#include "clang/Driver/Options.h"
18#include "clang/Frontend/FrontendDiagnostic.h"
19#include "clang/Frontend/TextDiagnosticPrinter.h"
20#include "clang/Frontend/Utils.h"
21#include "llvm/ADT/STLExtras.h"
22#include "llvm/ADT/StringExtras.h"
23#include "llvm/ADT/StringSwitch.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/MCInstPrinter.h"
30#include "llvm/MC/MCInstrInfo.h"
31#include "llvm/MC/MCObjectFileInfo.h"
32#include "llvm/MC/MCObjectWriter.h"
33#include "llvm/MC/MCParser/MCAsmParser.h"
34#include "llvm/MC/MCParser/MCTargetAsmParser.h"
35#include "llvm/MC/MCRegisterInfo.h"
36#include "llvm/MC/MCSectionMachO.h"
37#include "llvm/MC/MCStreamer.h"
38#include "llvm/MC/MCSubtargetInfo.h"
39#include "llvm/MC/MCTargetOptions.h"
40#include "llvm/MC/TargetRegistry.h"
41#include "llvm/Option/Arg.h"
42#include "llvm/Option/ArgList.h"
43#include "llvm/Option/OptTable.h"
44#include "llvm/Support/CommandLine.h"
45#include "llvm/Support/ErrorHandling.h"
46#include "llvm/Support/FileSystem.h"
47#include "llvm/Support/FormattedStream.h"
48#include "llvm/Support/MemoryBuffer.h"
49#include "llvm/Support/Path.h"
50#include "llvm/Support/Process.h"
51#include "llvm/Support/Signals.h"
52#include "llvm/Support/SourceMgr.h"
53#include "llvm/Support/TargetSelect.h"
54#include "llvm/Support/Timer.h"
55#include "llvm/Support/raw_ostream.h"
56#include "llvm/TargetParser/Host.h"
57#include "llvm/TargetParser/Triple.h"
58#include <memory>
59#include <optional>
60#include <system_error>
61using namespace clang;
62using namespace clang::driver;
63using namespace clang::driver::options;
64using namespace llvm;
65using namespace llvm::opt;
66
67namespace {
68
69/// Helper class for representing a single invocation of the assembler.
70struct AssemblerInvocation {
71 /// @name Target Options
72 /// @{
73
74 /// The name of the target triple to assemble for.
75 std::string Triple;
76
77 /// If given, the name of the target CPU to determine which instructions
78 /// are legal.
79 std::string CPU;
80
81 /// The list of target specific features to enable or disable -- this should
82 /// be a list of strings starting with '+' or '-'.
83 std::vector<std::string> Features;
84
85 /// The list of symbol definitions.
86 std::vector<std::string> SymbolDefs;
87
88 /// @}
89 /// @name Language Options
90 /// @{
91
92 std::vector<std::string> IncludePaths;
93 LLVM_PREFERRED_TYPE(bool)
94 unsigned NoInitialTextSection : 1;
95 LLVM_PREFERRED_TYPE(bool)
96 unsigned SaveTemporaryLabels : 1;
97 LLVM_PREFERRED_TYPE(bool)
98 unsigned GenDwarfForAssembly : 1;
99 LLVM_PREFERRED_TYPE(bool)
100 unsigned Dwarf64 : 1;
101 unsigned DwarfVersion;
102 std::string DwarfDebugFlags;
103 std::string DwarfDebugProducer;
104 std::string DebugCompilationDir;
105 llvm::SmallVector<std::pair<std::string, std::string>, 0> DebugPrefixMap;
106 llvm::DebugCompressionType CompressDebugSections =
107 llvm::DebugCompressionType::None;
108 std::string MainFileName;
109 std::string SplitDwarfOutput;
110
111 /// @}
112 /// @name Frontend Options
113 /// @{
114
115 std::string InputFile;
116 std::vector<std::string> LLVMArgs;
117 std::string OutputPath;
118 enum FileType {
119 FT_Asm, ///< Assembly (.s) output, transliterate mode.
120 FT_Null, ///< No output, for timing purposes.
121 FT_Obj ///< Object file output.
122 };
123 FileType OutputType;
124 LLVM_PREFERRED_TYPE(bool)
125 unsigned ShowHelp : 1;
126 LLVM_PREFERRED_TYPE(bool)
127 unsigned ShowVersion : 1;
128
129 /// @}
130 /// @name Transliterate Options
131 /// @{
132
133 unsigned OutputAsmVariant;
134 LLVM_PREFERRED_TYPE(bool)
135 unsigned ShowEncoding : 1;
136 LLVM_PREFERRED_TYPE(bool)
137 unsigned ShowInst : 1;
138
139 /// @}
140 /// @name Assembler Options
141 /// @{
142
143 LLVM_PREFERRED_TYPE(bool)
144 unsigned RelaxAll : 1;
145 LLVM_PREFERRED_TYPE(bool)
146 unsigned NoExecStack : 1;
147 LLVM_PREFERRED_TYPE(bool)
148 unsigned FatalWarnings : 1;
149 LLVM_PREFERRED_TYPE(bool)
150 unsigned NoWarn : 1;
151 LLVM_PREFERRED_TYPE(bool)
152 unsigned NoTypeCheck : 1;
153 LLVM_PREFERRED_TYPE(bool)
154 unsigned IncrementalLinkerCompatible : 1;
155 LLVM_PREFERRED_TYPE(bool)
156 unsigned EmbedBitcode : 1;
157
158 /// Whether to emit DWARF unwind info.
159 EmitDwarfUnwindType EmitDwarfUnwind;
160
161 // Whether to emit compact-unwind for non-canonical entries.
162 // Note: maybe overriden by other constraints.
163 LLVM_PREFERRED_TYPE(bool)
164 unsigned EmitCompactUnwindNonCanonical : 1;
165
166 LLVM_PREFERRED_TYPE(bool)
167 unsigned Crel : 1;
168 LLVM_PREFERRED_TYPE(bool)
169 unsigned ImplicitMapsyms : 1;
170
171 LLVM_PREFERRED_TYPE(bool)
172 unsigned X86RelaxRelocations : 1;
173 LLVM_PREFERRED_TYPE(bool)
174 unsigned X86Sse2Avx : 1;
175
176 /// The name of the relocation model to use.
177 std::string RelocationModel;
178
179 /// The ABI targeted by the backend. Specified using -target-abi. Empty
180 /// otherwise.
181 std::string TargetABI;
182
183 /// Darwin target variant triple, the variant of the deployment target
184 /// for which the code is being compiled.
185 std::optional<llvm::Triple> DarwinTargetVariantTriple;
186
187 /// The version of the darwin target variant SDK which was used during the
188 /// compilation
189 llvm::VersionTuple DarwinTargetVariantSDKVersion;
190
191 /// The name of a file to use with \c .secure_log_unique directives.
192 std::string AsSecureLogFile;
193 /// @}
194
195public:
196 AssemblerInvocation() {
197 Triple = "";
198 NoInitialTextSection = 0;
199 InputFile = "-";
200 OutputPath = "-";
201 OutputType = FT_Asm;
202 OutputAsmVariant = 0;
203 ShowInst = 0;
204 ShowEncoding = 0;
205 RelaxAll = 0;
206 NoExecStack = 0;
207 FatalWarnings = 0;
208 NoWarn = 0;
209 NoTypeCheck = 0;
210 IncrementalLinkerCompatible = 0;
211 Dwarf64 = 0;
212 DwarfVersion = 0;
213 EmbedBitcode = 0;
214 EmitDwarfUnwind = EmitDwarfUnwindType::Default;
215 EmitCompactUnwindNonCanonical = false;
216 Crel = false;
217 ImplicitMapsyms = 0;
218 X86RelaxRelocations = 0;
219 X86Sse2Avx = 0;
220 }
221
222 static bool CreateFromArgs(AssemblerInvocation &Res,
223 ArrayRef<const char *> Argv,
224 DiagnosticsEngine &Diags);
225};
226
227}
228
229bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
230 ArrayRef<const char *> Argv,
231 DiagnosticsEngine &Diags) {
232 bool Success = true;
233
234 // Parse the arguments.
235 const OptTable &OptTbl = getDriverOptTable();
236
237 llvm::opt::Visibility VisibilityMask(options::CC1AsOption);
238 unsigned MissingArgIndex, MissingArgCount;
239 InputArgList Args =
240 OptTbl.ParseArgs(Argv, MissingArgIndex, MissingArgCount, VisibilityMask);
241
242 // Check for missing argument error.
243 if (MissingArgCount) {
244 Diags.Report(diag::err_drv_missing_argument)
245 << Args.getArgString(MissingArgIndex) << MissingArgCount;
246 Success = false;
247 }
248
249 // Issue errors on unknown arguments.
250 for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
251 auto ArgString = A->getAsString(Args);
252 std::string Nearest;
253 if (OptTbl.findNearest(ArgString, Nearest, VisibilityMask) > 1)
254 Diags.Report(diag::err_drv_unknown_argument) << ArgString;
255 else
256 Diags.Report(diag::err_drv_unknown_argument_with_suggestion)
257 << ArgString << Nearest;
258 Success = false;
259 }
260
261 // Construct the invocation.
262
263 // Target Options
264 Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
265 if (Arg *A = Args.getLastArg(options::OPT_darwin_target_variant_triple))
266 Opts.DarwinTargetVariantTriple = llvm::Triple(A->getValue());
267 if (Arg *A = Args.getLastArg(OPT_darwin_target_variant_sdk_version_EQ)) {
268 VersionTuple Version;
269 if (Version.tryParse(A->getValue()))
270 Diags.Report(diag::err_drv_invalid_value)
271 << A->getAsString(Args) << A->getValue();
272 else
273 Opts.DarwinTargetVariantSDKVersion = Version;
274 }
275
276 Opts.CPU = std::string(Args.getLastArgValue(OPT_target_cpu));
277 Opts.Features = Args.getAllArgValues(OPT_target_feature);
278
279 // Use the default target triple if unspecified.
280 if (Opts.Triple.empty())
281 Opts.Triple = llvm::sys::getDefaultTargetTriple();
282
283 // Language Options
284 Opts.IncludePaths = Args.getAllArgValues(OPT_I);
285 Opts.NoInitialTextSection = Args.hasArg(OPT_n);
286 Opts.SaveTemporaryLabels = Args.hasArg(OPT_msave_temp_labels);
287 // Any DebugInfoKind implies GenDwarfForAssembly.
288 Opts.GenDwarfForAssembly = Args.hasArg(OPT_debug_info_kind_EQ);
289
290 if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections_EQ)) {
291 Opts.CompressDebugSections =
292 llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
293 .Case("none", llvm::DebugCompressionType::None)
294 .Case("zlib", llvm::DebugCompressionType::Zlib)
295 .Case("zstd", llvm::DebugCompressionType::Zstd)
296 .Default(llvm::DebugCompressionType::None);
297 }
298
299 if (auto *DwarfFormatArg = Args.getLastArg(OPT_gdwarf64, OPT_gdwarf32))
300 Opts.Dwarf64 = DwarfFormatArg->getOption().matches(OPT_gdwarf64);
301 Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 2, Diags);
302 Opts.DwarfDebugFlags =
303 std::string(Args.getLastArgValue(OPT_dwarf_debug_flags));
304 Opts.DwarfDebugProducer =
305 std::string(Args.getLastArgValue(OPT_dwarf_debug_producer));
306 if (const Arg *A = Args.getLastArg(options::OPT_ffile_compilation_dir_EQ,
307 options::OPT_fdebug_compilation_dir_EQ))
308 Opts.DebugCompilationDir = A->getValue();
309 Opts.MainFileName = std::string(Args.getLastArgValue(OPT_main_file_name));
310
311 for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ)) {
312 auto Split = StringRef(Arg).split('=');
313 Opts.DebugPrefixMap.emplace_back(Split.first, Split.second);
314 }
315
316 // Frontend Options
317 if (Args.hasArg(OPT_INPUT)) {
318 bool First = true;
319 for (const Arg *A : Args.filtered(OPT_INPUT)) {
320 if (First) {
321 Opts.InputFile = A->getValue();
322 First = false;
323 } else {
324 Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
325 Success = false;
326 }
327 }
328 }
329 Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
330 Opts.OutputPath = std::string(Args.getLastArgValue(OPT_o));
331 Opts.SplitDwarfOutput =
332 std::string(Args.getLastArgValue(OPT_split_dwarf_output));
333 if (Arg *A = Args.getLastArg(OPT_filetype)) {
334 StringRef Name = A->getValue();
335 unsigned OutputType = StringSwitch<unsigned>(Name)
336 .Case("asm", FT_Asm)
337 .Case("null", FT_Null)
338 .Case("obj", FT_Obj)
339 .Default(~0U);
340 if (OutputType == ~0U) {
341 Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
342 Success = false;
343 } else
344 Opts.OutputType = FileType(OutputType);
345 }
346 Opts.ShowHelp = Args.hasArg(OPT_help);
347 Opts.ShowVersion = Args.hasArg(OPT_version);
348
349 // Transliterate Options
350 Opts.OutputAsmVariant =
351 getLastArgIntValue(Args, OPT_output_asm_variant, 0, Diags);
352 Opts.ShowEncoding = Args.hasArg(OPT_show_encoding);
353 Opts.ShowInst = Args.hasArg(OPT_show_inst);
354
355 // Assemble Options
356 Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
357 Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
358 Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
359 Opts.NoWarn = Args.hasArg(OPT_massembler_no_warn);
360 Opts.NoTypeCheck = Args.hasArg(OPT_mno_type_check);
361 Opts.RelocationModel =
362 std::string(Args.getLastArgValue(OPT_mrelocation_model, "pic"));
363 Opts.TargetABI = std::string(Args.getLastArgValue(OPT_target_abi));
364 Opts.IncrementalLinkerCompatible =
365 Args.hasArg(OPT_mincremental_linker_compatible);
366 Opts.SymbolDefs = Args.getAllArgValues(OPT_defsym);
367
368 // EmbedBitcode Option. If -fembed-bitcode is enabled, set the flag.
369 // EmbedBitcode behaves the same for all embed options for assembly files.
370 if (auto *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
371 Opts.EmbedBitcode = llvm::StringSwitch<unsigned>(A->getValue())
372 .Case("all", 1)
373 .Case("bitcode", 1)
374 .Case("marker", 1)
375 .Default(0);
376 }
377
378 if (auto *A = Args.getLastArg(OPT_femit_dwarf_unwind_EQ)) {
379 Opts.EmitDwarfUnwind =
380 llvm::StringSwitch<EmitDwarfUnwindType>(A->getValue())
381 .Case("always", EmitDwarfUnwindType::Always)
382 .Case("no-compact-unwind", EmitDwarfUnwindType::NoCompactUnwind)
383 .Case("default", EmitDwarfUnwindType::Default);
384 }
385
386 Opts.EmitCompactUnwindNonCanonical =
387 Args.hasArg(OPT_femit_compact_unwind_non_canonical);
388 Opts.Crel = Args.hasArg(OPT_crel);
389 Opts.ImplicitMapsyms = Args.hasArg(OPT_mmapsyms_implicit);
390 Opts.X86RelaxRelocations = !Args.hasArg(OPT_mrelax_relocations_no);
391 Opts.X86Sse2Avx = Args.hasArg(OPT_msse2avx);
392
393 Opts.AsSecureLogFile = Args.getLastArgValue(OPT_as_secure_log_file);
394
395 return Success;
396}
397
398static std::unique_ptr<raw_fd_ostream>
399getOutputStream(StringRef Path, DiagnosticsEngine &Diags, bool Binary) {
400 // Make sure that the Out file gets unlinked from the disk if we get a
401 // SIGINT.
402 if (Path != "-")
403 sys::RemoveFileOnSignal(Path);
404
405 std::error_code EC;
406 auto Out = std::make_unique<raw_fd_ostream>(
407 Path, EC, (Binary ? sys::fs::OF_None : sys::fs::OF_TextWithCRLF));
408 if (EC) {
409 Diags.Report(diag::err_fe_unable_to_open_output) << Path << EC.message();
410 return nullptr;
411 }
412
413 return Out;
414}
415
416static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
417 DiagnosticsEngine &Diags) {
418 // Get the target specific parser.
419 std::string Error;
420 const Target *TheTarget = TargetRegistry::lookupTarget(Opts.Triple, Error);
421 if (!TheTarget)
422 return Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
423
424 ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer =
425 MemoryBuffer::getFileOrSTDIN(Opts.InputFile, /*IsText=*/true);
426
427 if (std::error_code EC = Buffer.getError()) {
428 return Diags.Report(diag::err_fe_error_reading)
429 << Opts.InputFile << EC.message();
430 }
431
432 SourceMgr SrcMgr;
433
434 // Tell SrcMgr about this buffer, which is what the parser will pick up.
435 unsigned BufferIndex = SrcMgr.AddNewSourceBuffer(std::move(*Buffer), SMLoc());
436
437 // Record the location of the include directories so that the lexer can find
438 // it later.
439 SrcMgr.setIncludeDirs(Opts.IncludePaths);
440
441 std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(Opts.Triple));
442 assert(MRI && "Unable to create target register info!");
443
444 MCTargetOptions MCOptions;
445 MCOptions.MCRelaxAll = Opts.RelaxAll;
446 MCOptions.EmitDwarfUnwind = Opts.EmitDwarfUnwind;
447 MCOptions.EmitCompactUnwindNonCanonical = Opts.EmitCompactUnwindNonCanonical;
448 MCOptions.MCSaveTempLabels = Opts.SaveTemporaryLabels;
449 MCOptions.Crel = Opts.Crel;
450 MCOptions.ImplicitMapSyms = Opts.ImplicitMapsyms;
451 MCOptions.X86RelaxRelocations = Opts.X86RelaxRelocations;
452 MCOptions.X86Sse2Avx = Opts.X86Sse2Avx;
453 MCOptions.CompressDebugSections = Opts.CompressDebugSections;
454 MCOptions.AsSecureLogFile = Opts.AsSecureLogFile;
455
456 std::unique_ptr<MCAsmInfo> MAI(
457 TheTarget->createMCAsmInfo(*MRI, Opts.Triple, MCOptions));
458 assert(MAI && "Unable to create target asm info!");
459
460 // Ensure MCAsmInfo initialization occurs before any use, otherwise sections
461 // may be created with a combination of default and explicit settings.
462
463
464 bool IsBinary = Opts.OutputType == AssemblerInvocation::FT_Obj;
465 if (Opts.OutputPath.empty())
466 Opts.OutputPath = "-";
467 std::unique_ptr<raw_fd_ostream> FDOS =
468 getOutputStream(Opts.OutputPath, Diags, IsBinary);
469 if (!FDOS)
470 return true;
471 std::unique_ptr<raw_fd_ostream> DwoOS;
472 if (!Opts.SplitDwarfOutput.empty())
473 DwoOS = getOutputStream(Opts.SplitDwarfOutput, Diags, IsBinary);
474
475 // Build up the feature string from the target feature list.
476 std::string FS = llvm::join(Opts.Features, ",");
477
478 std::unique_ptr<MCSubtargetInfo> STI(
479 TheTarget->createMCSubtargetInfo(Opts.Triple, Opts.CPU, FS));
480 assert(STI && "Unable to create subtarget info!");
481
482 MCContext Ctx(Triple(Opts.Triple), MAI.get(), MRI.get(), STI.get(), &SrcMgr,
483 &MCOptions);
484
485 bool PIC = false;
486 if (Opts.RelocationModel == "static") {
487 PIC = false;
488 } else if (Opts.RelocationModel == "pic") {
489 PIC = true;
490 } else {
491 assert(Opts.RelocationModel == "dynamic-no-pic" &&
492 "Invalid PIC model!");
493 PIC = false;
494 }
495
496 // FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
497 // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
498 std::unique_ptr<MCObjectFileInfo> MOFI(
499 TheTarget->createMCObjectFileInfo(Ctx, PIC));
500 Ctx.setObjectFileInfo(MOFI.get());
501
502 if (Opts.GenDwarfForAssembly)
503 Ctx.setGenDwarfForAssembly(true);
504 if (!Opts.DwarfDebugFlags.empty())
505 Ctx.setDwarfDebugFlags(StringRef(Opts.DwarfDebugFlags));
506 if (!Opts.DwarfDebugProducer.empty())
507 Ctx.setDwarfDebugProducer(StringRef(Opts.DwarfDebugProducer));
508 if (!Opts.DebugCompilationDir.empty())
509 Ctx.setCompilationDir(Opts.DebugCompilationDir);
510 else {
511 // If no compilation dir is set, try to use the current directory.
512 SmallString<128> CWD;
513 if (!sys::fs::current_path(CWD))
514 Ctx.setCompilationDir(CWD);
515 }
516 if (!Opts.DebugPrefixMap.empty())
517 for (const auto &KV : Opts.DebugPrefixMap)
518 Ctx.addDebugPrefixMapEntry(KV.first, KV.second);
519 if (!Opts.MainFileName.empty())
520 Ctx.setMainFileName(StringRef(Opts.MainFileName));
521 Ctx.setDwarfFormat(Opts.Dwarf64 ? dwarf::DWARF64 : dwarf::DWARF32);
522 Ctx.setDwarfVersion(Opts.DwarfVersion);
523 if (Opts.GenDwarfForAssembly)
524 Ctx.setGenDwarfRootFile(Opts.InputFile,
525 SrcMgr.getMemoryBuffer(BufferIndex)->getBuffer());
526
527 std::unique_ptr<MCStreamer> Str;
528
529 std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
530 assert(MCII && "Unable to create instruction info!");
531
532 raw_pwrite_stream *Out = FDOS.get();
533 std::unique_ptr<buffer_ostream> BOS;
534
535 MCOptions.MCNoWarn = Opts.NoWarn;
536 MCOptions.MCFatalWarnings = Opts.FatalWarnings;
537 MCOptions.MCNoTypeCheck = Opts.NoTypeCheck;
538 MCOptions.ShowMCInst = Opts.ShowInst;
539 MCOptions.AsmVerbose = true;
540 MCOptions.MCUseDwarfDirectory = MCTargetOptions::EnableDwarfDirectory;
541 MCOptions.ABIName = Opts.TargetABI;
542
543 // FIXME: There is a bit of code duplication with addPassesToEmitFile.
544 if (Opts.OutputType == AssemblerInvocation::FT_Asm) {
545 std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
546 llvm::Triple(Opts.Triple), Opts.OutputAsmVariant, *MAI, *MCII, *MRI));
547
548 std::unique_ptr<MCCodeEmitter> CE;
549 if (Opts.ShowEncoding)
550 CE.reset(TheTarget->createMCCodeEmitter(*MCII, Ctx));
551 std::unique_ptr<MCAsmBackend> MAB(
552 TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));
553
554 auto FOut = std::make_unique<formatted_raw_ostream>(*Out);
555 Str.reset(TheTarget->createAsmStreamer(Ctx, std::move(FOut), std::move(IP),
556 std::move(CE), std::move(MAB)));
557 } else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
558 Str.reset(createNullStreamer(Ctx));
559 } else {
560 assert(Opts.OutputType == AssemblerInvocation::FT_Obj &&
561 "Invalid file type!");
562 if (!FDOS->supportsSeeking()) {
563 BOS = std::make_unique<buffer_ostream>(*FDOS);
564 Out = BOS.get();
565 }
566
567 std::unique_ptr<MCCodeEmitter> CE(
568 TheTarget->createMCCodeEmitter(*MCII, Ctx));
569 std::unique_ptr<MCAsmBackend> MAB(
570 TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));
571 assert(MAB && "Unable to create asm backend!");
572
573 std::unique_ptr<MCObjectWriter> OW =
574 DwoOS ? MAB->createDwoObjectWriter(*Out, *DwoOS)
575 : MAB->createObjectWriter(*Out);
576
577 Triple T(Opts.Triple);
578 Str.reset(TheTarget->createMCObjectStreamer(
579 T, Ctx, std::move(MAB), std::move(OW), std::move(CE), *STI));
580 Str->initSections(Opts.NoExecStack, *STI);
581 if (T.isOSBinFormatMachO() && T.isOSDarwin()) {
582 Triple *TVT = Opts.DarwinTargetVariantTriple
583 ? &*Opts.DarwinTargetVariantTriple
584 : nullptr;
585 Str->emitVersionForTarget(T, VersionTuple(), TVT,
586 Opts.DarwinTargetVariantSDKVersion);
587 }
588 }
589
590 // When -fembed-bitcode is passed to clang_as, a 1-byte marker
591 // is emitted in __LLVM,__asm section if the object file is MachO format.
592 if (Opts.EmbedBitcode && Ctx.getObjectFileType() == MCContext::IsMachO) {
593 MCSection *AsmLabel = Ctx.getMachOSection(
594 "__LLVM", "__asm", MachO::S_REGULAR, 4, SectionKind::getReadOnly());
595 Str->switchSection(AsmLabel);
596 Str->emitZeros(1);
597 }
598
599 bool Failed = false;
600
601 std::unique_ptr<MCAsmParser> Parser(
602 createMCAsmParser(SrcMgr, Ctx, *Str, *MAI));
603
604 // FIXME: init MCTargetOptions from sanitizer flags here.
605 std::unique_ptr<MCTargetAsmParser> TAP(
606 TheTarget->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
607 if (!TAP)
608 Failed = Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
609
610 // Set values for symbols, if any.
611 for (auto &S : Opts.SymbolDefs) {
612 auto Pair = StringRef(S).split('=');
613 auto Sym = Pair.first;
614 auto Val = Pair.second;
615 int64_t Value;
616 // We have already error checked this in the driver.
617 Val.getAsInteger(0, Value);
618 Ctx.setSymbolValue(Parser->getStreamer(), Sym, Value);
619 }
620
621 if (!Failed) {
622 Parser->setTargetParser(*TAP);
623 Failed = Parser->Run(Opts.NoInitialTextSection);
624 }
625
626 return Failed;
627}
628
629static bool ExecuteAssembler(AssemblerInvocation &Opts,
630 DiagnosticsEngine &Diags) {
631 bool Failed = ExecuteAssemblerImpl(Opts, Diags);
632
633 // Delete output file if there were errors.
634 if (Failed) {
635 if (Opts.OutputPath != "-")
636 sys::fs::remove(Opts.OutputPath);
637 if (!Opts.SplitDwarfOutput.empty() && Opts.SplitDwarfOutput != "-")
638 sys::fs::remove(Opts.SplitDwarfOutput);
639 }
640
641 return Failed;
642}
643
644static void LLVMErrorHandler(void *UserData, const char *Message,
645 bool GenCrashDiag) {
646 DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
647
648 Diags.Report(diag::err_fe_error_backend) << Message;
649
650 // We cannot recover from llvm errors.
651 sys::Process::Exit(1);
652}
653
654int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
655 // Initialize targets and assembly printers/parsers.
656 InitializeAllTargetInfos();
657 InitializeAllTargetMCs();
658 InitializeAllAsmParsers();
659
660 // Construct our diagnostic client.
661 DiagnosticOptions DiagOpts;
662 TextDiagnosticPrinter *DiagClient =
663 new TextDiagnosticPrinter(errs(), DiagOpts);
664 DiagClient->setPrefix("clang -cc1as");
665 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
666 DiagnosticsEngine Diags(DiagID, DiagOpts, DiagClient);
667
668 // Set an error handler, so that any LLVM backend diagnostics go through our
669 // error handler.
670 ScopedFatalErrorHandler FatalErrorHandler
671 (LLVMErrorHandler, static_cast<void*>(&Diags));
672
673 // Parse the arguments.
674 AssemblerInvocation Asm;
675 if (!AssemblerInvocation::CreateFromArgs(Asm, Argv, Diags))
676 return 1;
677
678 if (Asm.ShowHelp) {
679 getDriverOptTable().printHelp(
680 llvm::outs(), "clang -cc1as [options] file...",
681 "Clang Integrated Assembler", /*ShowHidden=*/false,
682 /*ShowAllAliases=*/false,
683 llvm::opt::Visibility(driver::options::CC1AsOption));
684
685 return 0;
686 }
687
688 // Honor -version.
689 //
690 // FIXME: Use a better -version message?
691 if (Asm.ShowVersion) {
692 llvm::cl::PrintVersionMessage();
693 return 0;
694 }
695
696 // Honor -mllvm.
697 //
698 // FIXME: Remove this, one day.
699 if (!Asm.LLVMArgs.empty()) {
700 unsigned NumArgs = Asm.LLVMArgs.size();
701 auto Args = std::make_unique<const char*[]>(NumArgs + 2);
702 Args[0] = "clang (LLVM option parsing)";
703 for (unsigned i = 0; i != NumArgs; ++i)
704 Args[i + 1] = Asm.LLVMArgs[i].c_str();
705 Args[NumArgs + 1] = nullptr;
706 llvm::cl::ParseCommandLineOptions(NumArgs + 1, Args.get());
707 }
708
709 // Execute the invocation, unless there were parsing errors.
710 bool Failed = Diags.hasErrorOccurred() || ExecuteAssembler(Asm, Diags);
711
712 // If any timers were active but haven't been destroyed yet, print their
713 // results now.
714 TimerGroup::printAll(errs());
715 TimerGroup::clearAll();
716
717 return !!Failed;
718}