1 //===--- BackendUtil.cpp - LLVM Backend Utilities -------------------------===//
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 #include "clang/CodeGen/BackendUtil.h"
10 #include "BackendConsumer.h"
11 #include "LinkInModulesPass.h"
12 #include "clang/Basic/CodeGenOptions.h"
13 #include "clang/Basic/Diagnostic.h"
14 #include "clang/Basic/LangOptions.h"
15 #include "clang/Basic/TargetOptions.h"
16 #include "clang/Frontend/FrontendDiagnostic.h"
17 #include "clang/Frontend/Utils.h"
18 #include "clang/Lex/HeaderSearchOptions.h"
19 #include "llvm/ADT/SmallSet.h"
20 #include "llvm/ADT/StringExtras.h"
21 #include "llvm/ADT/StringSwitch.h"
22 #include "llvm/Analysis/AliasAnalysis.h"
23 #include "llvm/Analysis/GlobalsModRef.h"
24 #include "llvm/Analysis/TargetLibraryInfo.h"
25 #include "llvm/Analysis/TargetTransformInfo.h"
26 #include "llvm/Bitcode/BitcodeReader.h"
27 #include "llvm/Bitcode/BitcodeWriter.h"
28 #include "llvm/Bitcode/BitcodeWriterPass.h"
29 #include "llvm/CodeGen/RegAllocRegistry.h"
30 #include "llvm/CodeGen/SchedulerRegistry.h"
31 #include "llvm/CodeGen/TargetSubtargetInfo.h"
32 #include "llvm/Frontend/Driver/CodeGenOptions.h"
33 #include "llvm/IR/DataLayout.h"
34 #include "llvm/IR/DebugInfo.h"
35 #include "llvm/IR/LegacyPassManager.h"
36 #include "llvm/IR/Module.h"
37 #include "llvm/IR/ModuleSummaryIndex.h"
38 #include "llvm/IR/PassManager.h"
39 #include "llvm/IR/Verifier.h"
40 #include "llvm/IRPrinter/IRPrintingPasses.h"
41 #include "llvm/LTO/LTOBackend.h"
42 #include "llvm/MC/MCAsmInfo.h"
43 #include "llvm/MC/TargetRegistry.h"
44 #include "llvm/Object/OffloadBinary.h"
45 #include "llvm/Passes/PassBuilder.h"
46 #include "llvm/Passes/PassPlugin.h"
47 #include "llvm/Passes/StandardInstrumentations.h"
48 #include "llvm/ProfileData/InstrProfCorrelator.h"
49 #include "llvm/Support/BuryPointer.h"
50 #include "llvm/Support/CommandLine.h"
51 #include "llvm/Support/MemoryBuffer.h"
52 #include "llvm/Support/PrettyStackTrace.h"
53 #include "llvm/Support/TimeProfiler.h"
54 #include "llvm/Support/Timer.h"
55 #include "llvm/Support/ToolOutputFile.h"
56 #include "llvm/Support/VirtualFileSystem.h"
57 #include "llvm/Support/raw_ostream.h"
58 #include "llvm/Target/TargetMachine.h"
59 #include "llvm/Target/TargetOptions.h"
60 #include "llvm/TargetParser/SubtargetFeature.h"
61 #include "llvm/TargetParser/Triple.h"
62 #include "llvm/Transforms/HipStdPar/HipStdPar.h"
63 #include "llvm/Transforms/IPO/EmbedBitcodePass.h"
64 #include "llvm/Transforms/IPO/LowerTypeTests.h"
65 #include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h"
66 #include "llvm/Transforms/InstCombine/InstCombine.h"
67 #include "llvm/Transforms/Instrumentation.h"
68 #include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
69 #include "llvm/Transforms/Instrumentation/AddressSanitizerOptions.h"
70 #include "llvm/Transforms/Instrumentation/BoundsChecking.h"
71 #include "llvm/Transforms/Instrumentation/DataFlowSanitizer.h"
72 #include "llvm/Transforms/Instrumentation/GCOVProfiler.h"
73 #include "llvm/Transforms/Instrumentation/HWAddressSanitizer.h"
74 #include "llvm/Transforms/Instrumentation/InstrProfiling.h"
75 #include "llvm/Transforms/Instrumentation/KCFI.h"
76 #include "llvm/Transforms/Instrumentation/MemProfiler.h"
77 #include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
78 #include "llvm/Transforms/Instrumentation/PGOInstrumentation.h"
79 #include "llvm/Transforms/Instrumentation/SanitizerBinaryMetadata.h"
80 #include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"
81 #include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
82 #include "llvm/Transforms/ObjCARC.h"
83 #include "llvm/Transforms/Scalar/EarlyCSE.h"
84 #include "llvm/Transforms/Scalar/GVN.h"
85 #include "llvm/Transforms/Scalar/JumpThreading.h"
86 #include "llvm/Transforms/Utils/Debugify.h"
87 #include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
88 #include "llvm/Transforms/Utils/ModuleUtils.h"
89 #include <memory>
90 #include <optional>
91 using namespace clang;
92 using namespace llvm;
93
94 #define HANDLE_EXTENSION(Ext) \
95 llvm::PassPluginLibraryInfo get##Ext##PluginInfo();
96 #include "llvm/Support/Extension.def"
97
98 namespace llvm {
99 extern cl::opt<bool> PrintPipelinePasses;
100
101 // Experiment to move sanitizers earlier.
102 static cl::opt<bool> ClSanitizeOnOptimizerEarlyEP(
103 "sanitizer-early-opt-ep", cl::Optional,
104 cl::desc("Insert sanitizers on OptimizerEarlyEP."), cl::init(false));
105
106 extern cl::opt<InstrProfCorrelator::ProfCorrelatorKind> ProfileCorrelate;
107
108 // Re-link builtin bitcodes after optimization
109 cl::opt<bool> ClRelinkBuiltinBitcodePostop(
110 "relink-builtin-bitcode-postop", cl::Optional,
111 cl::desc("Re-link builtin bitcodes after optimization."), cl::init(false));
112 } // namespace llvm
113
114 namespace {
115
116 // Default filename used for profile generation.
getDefaultProfileGenName()117 std::string getDefaultProfileGenName() {
118 return DebugInfoCorrelate || ProfileCorrelate != InstrProfCorrelator::NONE
119 ? "default_%m.proflite"
120 : "default_%m.profraw";
121 }
122
123 class EmitAssemblyHelper {
124 DiagnosticsEngine &Diags;
125 const HeaderSearchOptions &HSOpts;
126 const CodeGenOptions &CodeGenOpts;
127 const clang::TargetOptions &TargetOpts;
128 const LangOptions &LangOpts;
129 llvm::Module *TheModule;
130 IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS;
131
132 Timer CodeGenerationTime;
133
134 std::unique_ptr<raw_pwrite_stream> OS;
135
136 Triple TargetTriple;
137
getTargetIRAnalysis() const138 TargetIRAnalysis getTargetIRAnalysis() const {
139 if (TM)
140 return TM->getTargetIRAnalysis();
141
142 return TargetIRAnalysis();
143 }
144
145 /// Generates the TargetMachine.
146 /// Leaves TM unchanged if it is unable to create the target machine.
147 /// Some of our clang tests specify triples which are not built
148 /// into clang. This is okay because these tests check the generated
149 /// IR, and they require DataLayout which depends on the triple.
150 /// In this case, we allow this method to fail and not report an error.
151 /// When MustCreateTM is used, we print an error if we are unable to load
152 /// the requested target.
153 void CreateTargetMachine(bool MustCreateTM);
154
155 /// Add passes necessary to emit assembly or LLVM IR.
156 ///
157 /// \return True on success.
158 bool AddEmitPasses(legacy::PassManager &CodeGenPasses, BackendAction Action,
159 raw_pwrite_stream &OS, raw_pwrite_stream *DwoOS);
160
openOutputFile(StringRef Path)161 std::unique_ptr<llvm::ToolOutputFile> openOutputFile(StringRef Path) {
162 std::error_code EC;
163 auto F = std::make_unique<llvm::ToolOutputFile>(Path, EC,
164 llvm::sys::fs::OF_None);
165 if (EC) {
166 Diags.Report(diag::err_fe_unable_to_open_output) << Path << EC.message();
167 F.reset();
168 }
169 return F;
170 }
171
172 void RunOptimizationPipeline(
173 BackendAction Action, std::unique_ptr<raw_pwrite_stream> &OS,
174 std::unique_ptr<llvm::ToolOutputFile> &ThinLinkOS, BackendConsumer *BC);
175 void RunCodegenPipeline(BackendAction Action,
176 std::unique_ptr<raw_pwrite_stream> &OS,
177 std::unique_ptr<llvm::ToolOutputFile> &DwoOS);
178
179 /// Check whether we should emit a module summary for regular LTO.
180 /// The module summary should be emitted by default for regular LTO
181 /// except for ld64 targets.
182 ///
183 /// \return True if the module summary should be emitted.
shouldEmitRegularLTOSummary() const184 bool shouldEmitRegularLTOSummary() const {
185 return CodeGenOpts.PrepareForLTO && !CodeGenOpts.DisableLLVMPasses &&
186 TargetTriple.getVendor() != llvm::Triple::Apple;
187 }
188
189 /// Check whether we should emit a flag for UnifiedLTO.
190 /// The UnifiedLTO module flag should be set when UnifiedLTO is enabled for
191 /// ThinLTO or Full LTO with module summaries.
shouldEmitUnifiedLTOModueFlag() const192 bool shouldEmitUnifiedLTOModueFlag() const {
193 return CodeGenOpts.UnifiedLTO &&
194 (CodeGenOpts.PrepareForThinLTO || shouldEmitRegularLTOSummary());
195 }
196
197 public:
EmitAssemblyHelper(DiagnosticsEngine & _Diags,const HeaderSearchOptions & HeaderSearchOpts,const CodeGenOptions & CGOpts,const clang::TargetOptions & TOpts,const LangOptions & LOpts,llvm::Module * M,IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS)198 EmitAssemblyHelper(DiagnosticsEngine &_Diags,
199 const HeaderSearchOptions &HeaderSearchOpts,
200 const CodeGenOptions &CGOpts,
201 const clang::TargetOptions &TOpts,
202 const LangOptions &LOpts, llvm::Module *M,
203 IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS)
204 : Diags(_Diags), HSOpts(HeaderSearchOpts), CodeGenOpts(CGOpts),
205 TargetOpts(TOpts), LangOpts(LOpts), TheModule(M), VFS(std::move(VFS)),
206 CodeGenerationTime("codegen", "Code Generation Time"),
207 TargetTriple(TheModule->getTargetTriple()) {}
208
~EmitAssemblyHelper()209 ~EmitAssemblyHelper() {
210 if (CodeGenOpts.DisableFree)
211 BuryPointer(std::move(TM));
212 }
213
214 std::unique_ptr<TargetMachine> TM;
215
216 // Emit output using the new pass manager for the optimization pipeline.
217 void EmitAssembly(BackendAction Action, std::unique_ptr<raw_pwrite_stream> OS,
218 BackendConsumer *BC);
219 };
220 } // namespace
221
222 static SanitizerCoverageOptions
getSancovOptsFromCGOpts(const CodeGenOptions & CGOpts)223 getSancovOptsFromCGOpts(const CodeGenOptions &CGOpts) {
224 SanitizerCoverageOptions Opts;
225 Opts.CoverageType =
226 static_cast<SanitizerCoverageOptions::Type>(CGOpts.SanitizeCoverageType);
227 Opts.IndirectCalls = CGOpts.SanitizeCoverageIndirectCalls;
228 Opts.TraceBB = CGOpts.SanitizeCoverageTraceBB;
229 Opts.TraceCmp = CGOpts.SanitizeCoverageTraceCmp;
230 Opts.TraceDiv = CGOpts.SanitizeCoverageTraceDiv;
231 Opts.TraceGep = CGOpts.SanitizeCoverageTraceGep;
232 Opts.Use8bitCounters = CGOpts.SanitizeCoverage8bitCounters;
233 Opts.TracePC = CGOpts.SanitizeCoverageTracePC;
234 Opts.TracePCGuard = CGOpts.SanitizeCoverageTracePCGuard;
235 Opts.NoPrune = CGOpts.SanitizeCoverageNoPrune;
236 Opts.Inline8bitCounters = CGOpts.SanitizeCoverageInline8bitCounters;
237 Opts.InlineBoolFlag = CGOpts.SanitizeCoverageInlineBoolFlag;
238 Opts.PCTable = CGOpts.SanitizeCoveragePCTable;
239 Opts.StackDepth = CGOpts.SanitizeCoverageStackDepth;
240 Opts.TraceLoads = CGOpts.SanitizeCoverageTraceLoads;
241 Opts.TraceStores = CGOpts.SanitizeCoverageTraceStores;
242 Opts.CollectControlFlow = CGOpts.SanitizeCoverageControlFlow;
243 return Opts;
244 }
245
246 static SanitizerBinaryMetadataOptions
getSanitizerBinaryMetadataOptions(const CodeGenOptions & CGOpts)247 getSanitizerBinaryMetadataOptions(const CodeGenOptions &CGOpts) {
248 SanitizerBinaryMetadataOptions Opts;
249 Opts.Covered = CGOpts.SanitizeBinaryMetadataCovered;
250 Opts.Atomics = CGOpts.SanitizeBinaryMetadataAtomics;
251 Opts.UAR = CGOpts.SanitizeBinaryMetadataUAR;
252 return Opts;
253 }
254
255 // Check if ASan should use GC-friendly instrumentation for globals.
256 // First of all, there is no point if -fdata-sections is off (expect for MachO,
257 // where this is not a factor). Also, on ELF this feature requires an assembler
258 // extension that only works with -integrated-as at the moment.
asanUseGlobalsGC(const Triple & T,const CodeGenOptions & CGOpts)259 static bool asanUseGlobalsGC(const Triple &T, const CodeGenOptions &CGOpts) {
260 if (!CGOpts.SanitizeAddressGlobalsDeadStripping)
261 return false;
262 switch (T.getObjectFormat()) {
263 case Triple::MachO:
264 case Triple::COFF:
265 return true;
266 case Triple::ELF:
267 return !CGOpts.DisableIntegratedAS;
268 case Triple::GOFF:
269 llvm::report_fatal_error("ASan not implemented for GOFF");
270 case Triple::XCOFF:
271 llvm::report_fatal_error("ASan not implemented for XCOFF.");
272 case Triple::Wasm:
273 case Triple::DXContainer:
274 case Triple::SPIRV:
275 case Triple::UnknownObjectFormat:
276 break;
277 }
278 return false;
279 }
280
281 static std::optional<llvm::CodeModel::Model>
getCodeModel(const CodeGenOptions & CodeGenOpts)282 getCodeModel(const CodeGenOptions &CodeGenOpts) {
283 unsigned CodeModel = llvm::StringSwitch<unsigned>(CodeGenOpts.CodeModel)
284 .Case("tiny", llvm::CodeModel::Tiny)
285 .Case("small", llvm::CodeModel::Small)
286 .Case("kernel", llvm::CodeModel::Kernel)
287 .Case("medium", llvm::CodeModel::Medium)
288 .Case("large", llvm::CodeModel::Large)
289 .Case("default", ~1u)
290 .Default(~0u);
291 assert(CodeModel != ~0u && "invalid code model!");
292 if (CodeModel == ~1u)
293 return std::nullopt;
294 return static_cast<llvm::CodeModel::Model>(CodeModel);
295 }
296
getCodeGenFileType(BackendAction Action)297 static CodeGenFileType getCodeGenFileType(BackendAction Action) {
298 if (Action == Backend_EmitObj)
299 return CodeGenFileType::ObjectFile;
300 else if (Action == Backend_EmitMCNull)
301 return CodeGenFileType::Null;
302 else {
303 assert(Action == Backend_EmitAssembly && "Invalid action!");
304 return CodeGenFileType::AssemblyFile;
305 }
306 }
307
actionRequiresCodeGen(BackendAction Action)308 static bool actionRequiresCodeGen(BackendAction Action) {
309 return Action != Backend_EmitNothing && Action != Backend_EmitBC &&
310 Action != Backend_EmitLL;
311 }
312
initTargetOptions(DiagnosticsEngine & Diags,llvm::TargetOptions & Options,const CodeGenOptions & CodeGenOpts,const clang::TargetOptions & TargetOpts,const LangOptions & LangOpts,const HeaderSearchOptions & HSOpts)313 static bool initTargetOptions(DiagnosticsEngine &Diags,
314 llvm::TargetOptions &Options,
315 const CodeGenOptions &CodeGenOpts,
316 const clang::TargetOptions &TargetOpts,
317 const LangOptions &LangOpts,
318 const HeaderSearchOptions &HSOpts) {
319 switch (LangOpts.getThreadModel()) {
320 case LangOptions::ThreadModelKind::POSIX:
321 Options.ThreadModel = llvm::ThreadModel::POSIX;
322 break;
323 case LangOptions::ThreadModelKind::Single:
324 Options.ThreadModel = llvm::ThreadModel::Single;
325 break;
326 }
327
328 // Set float ABI type.
329 assert((CodeGenOpts.FloatABI == "soft" || CodeGenOpts.FloatABI == "softfp" ||
330 CodeGenOpts.FloatABI == "hard" || CodeGenOpts.FloatABI.empty()) &&
331 "Invalid Floating Point ABI!");
332 Options.FloatABIType =
333 llvm::StringSwitch<llvm::FloatABI::ABIType>(CodeGenOpts.FloatABI)
334 .Case("soft", llvm::FloatABI::Soft)
335 .Case("softfp", llvm::FloatABI::Soft)
336 .Case("hard", llvm::FloatABI::Hard)
337 .Default(llvm::FloatABI::Default);
338
339 // Set FP fusion mode.
340 switch (LangOpts.getDefaultFPContractMode()) {
341 case LangOptions::FPM_Off:
342 // Preserve any contraction performed by the front-end. (Strict performs
343 // splitting of the muladd intrinsic in the backend.)
344 Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;
345 break;
346 case LangOptions::FPM_On:
347 case LangOptions::FPM_FastHonorPragmas:
348 Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;
349 break;
350 case LangOptions::FPM_Fast:
351 Options.AllowFPOpFusion = llvm::FPOpFusion::Fast;
352 break;
353 }
354
355 Options.BinutilsVersion =
356 llvm::TargetMachine::parseBinutilsVersion(CodeGenOpts.BinutilsVersion);
357 Options.UseInitArray = CodeGenOpts.UseInitArray;
358 Options.DisableIntegratedAS = CodeGenOpts.DisableIntegratedAS;
359 Options.CompressDebugSections = CodeGenOpts.getCompressDebugSections();
360 Options.RelaxELFRelocations = CodeGenOpts.RelaxELFRelocations;
361
362 // Set EABI version.
363 Options.EABIVersion = TargetOpts.EABIVersion;
364
365 if (LangOpts.hasSjLjExceptions())
366 Options.ExceptionModel = llvm::ExceptionHandling::SjLj;
367 if (LangOpts.hasSEHExceptions())
368 Options.ExceptionModel = llvm::ExceptionHandling::WinEH;
369 if (LangOpts.hasDWARFExceptions())
370 Options.ExceptionModel = llvm::ExceptionHandling::DwarfCFI;
371 if (LangOpts.hasWasmExceptions())
372 Options.ExceptionModel = llvm::ExceptionHandling::Wasm;
373
374 Options.NoInfsFPMath = LangOpts.NoHonorInfs;
375 Options.NoNaNsFPMath = LangOpts.NoHonorNaNs;
376 Options.NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;
377 Options.UnsafeFPMath = LangOpts.AllowFPReassoc && LangOpts.AllowRecip &&
378 LangOpts.NoSignedZero && LangOpts.ApproxFunc &&
379 (LangOpts.getDefaultFPContractMode() ==
380 LangOptions::FPModeKind::FPM_Fast ||
381 LangOpts.getDefaultFPContractMode() ==
382 LangOptions::FPModeKind::FPM_FastHonorPragmas);
383 Options.ApproxFuncFPMath = LangOpts.ApproxFunc;
384
385 Options.BBSections =
386 llvm::StringSwitch<llvm::BasicBlockSection>(CodeGenOpts.BBSections)
387 .Case("all", llvm::BasicBlockSection::All)
388 .Case("labels", llvm::BasicBlockSection::Labels)
389 .StartsWith("list=", llvm::BasicBlockSection::List)
390 .Case("none", llvm::BasicBlockSection::None)
391 .Default(llvm::BasicBlockSection::None);
392
393 if (Options.BBSections == llvm::BasicBlockSection::List) {
394 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
395 MemoryBuffer::getFile(CodeGenOpts.BBSections.substr(5));
396 if (!MBOrErr) {
397 Diags.Report(diag::err_fe_unable_to_load_basic_block_sections_file)
398 << MBOrErr.getError().message();
399 return false;
400 }
401 Options.BBSectionsFuncListBuf = std::move(*MBOrErr);
402 }
403
404 Options.EnableMachineFunctionSplitter = CodeGenOpts.SplitMachineFunctions;
405 Options.FunctionSections = CodeGenOpts.FunctionSections;
406 Options.DataSections = CodeGenOpts.DataSections;
407 Options.IgnoreXCOFFVisibility = LangOpts.IgnoreXCOFFVisibility;
408 Options.UniqueSectionNames = CodeGenOpts.UniqueSectionNames;
409 Options.UniqueBasicBlockSectionNames =
410 CodeGenOpts.UniqueBasicBlockSectionNames;
411 Options.TLSSize = CodeGenOpts.TLSSize;
412 Options.EnableTLSDESC = CodeGenOpts.EnableTLSDESC;
413 Options.EmulatedTLS = CodeGenOpts.EmulatedTLS;
414 Options.DebuggerTuning = CodeGenOpts.getDebuggerTuning();
415 Options.EmitStackSizeSection = CodeGenOpts.StackSizeSection;
416 Options.StackUsageOutput = CodeGenOpts.StackUsageOutput;
417 Options.EmitAddrsig = CodeGenOpts.Addrsig;
418 Options.ForceDwarfFrameSection = CodeGenOpts.ForceDwarfFrameSection;
419 Options.EmitCallSiteInfo = CodeGenOpts.EmitCallSiteInfo;
420 Options.EnableAIXExtendedAltivecABI = LangOpts.EnableAIXExtendedAltivecABI;
421 Options.XRayFunctionIndex = CodeGenOpts.XRayFunctionIndex;
422 Options.LoopAlignment = CodeGenOpts.LoopAlignment;
423 Options.DebugStrictDwarf = CodeGenOpts.DebugStrictDwarf;
424 Options.ObjectFilenameForDebug = CodeGenOpts.ObjectFilenameForDebug;
425 Options.Hotpatch = CodeGenOpts.HotPatch;
426 Options.JMCInstrument = CodeGenOpts.JMCInstrument;
427 Options.XCOFFReadOnlyPointers = CodeGenOpts.XCOFFReadOnlyPointers;
428
429 switch (CodeGenOpts.getSwiftAsyncFramePointer()) {
430 case CodeGenOptions::SwiftAsyncFramePointerKind::Auto:
431 Options.SwiftAsyncFramePointer =
432 SwiftAsyncFramePointerMode::DeploymentBased;
433 break;
434
435 case CodeGenOptions::SwiftAsyncFramePointerKind::Always:
436 Options.SwiftAsyncFramePointer = SwiftAsyncFramePointerMode::Always;
437 break;
438
439 case CodeGenOptions::SwiftAsyncFramePointerKind::Never:
440 Options.SwiftAsyncFramePointer = SwiftAsyncFramePointerMode::Never;
441 break;
442 }
443
444 Options.MCOptions.SplitDwarfFile = CodeGenOpts.SplitDwarfFile;
445 Options.MCOptions.EmitDwarfUnwind = CodeGenOpts.getEmitDwarfUnwind();
446 Options.MCOptions.EmitCompactUnwindNonCanonical =
447 CodeGenOpts.EmitCompactUnwindNonCanonical;
448 Options.MCOptions.MCRelaxAll = CodeGenOpts.RelaxAll;
449 Options.MCOptions.MCSaveTempLabels = CodeGenOpts.SaveTempLabels;
450 Options.MCOptions.MCUseDwarfDirectory =
451 CodeGenOpts.NoDwarfDirectoryAsm
452 ? llvm::MCTargetOptions::DisableDwarfDirectory
453 : llvm::MCTargetOptions::EnableDwarfDirectory;
454 Options.MCOptions.MCNoExecStack = CodeGenOpts.NoExecStack;
455 Options.MCOptions.MCIncrementalLinkerCompatible =
456 CodeGenOpts.IncrementalLinkerCompatible;
457 Options.MCOptions.MCFatalWarnings = CodeGenOpts.FatalWarnings;
458 Options.MCOptions.MCNoWarn = CodeGenOpts.NoWarn;
459 Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;
460 Options.MCOptions.Dwarf64 = CodeGenOpts.Dwarf64;
461 Options.MCOptions.PreserveAsmComments = CodeGenOpts.PreserveAsmComments;
462 Options.MCOptions.ABIName = TargetOpts.ABI;
463 for (const auto &Entry : HSOpts.UserEntries)
464 if (!Entry.IsFramework &&
465 (Entry.Group == frontend::IncludeDirGroup::Quoted ||
466 Entry.Group == frontend::IncludeDirGroup::Angled ||
467 Entry.Group == frontend::IncludeDirGroup::System))
468 Options.MCOptions.IASSearchPaths.push_back(
469 Entry.IgnoreSysRoot ? Entry.Path : HSOpts.Sysroot + Entry.Path);
470 Options.MCOptions.Argv0 = CodeGenOpts.Argv0;
471 Options.MCOptions.CommandLineArgs = CodeGenOpts.CommandLineArgs;
472 Options.MCOptions.AsSecureLogFile = CodeGenOpts.AsSecureLogFile;
473 Options.MCOptions.PPCUseFullRegisterNames =
474 CodeGenOpts.PPCUseFullRegisterNames;
475 Options.MisExpect = CodeGenOpts.MisExpect;
476
477 return true;
478 }
479
480 static std::optional<GCOVOptions>
getGCOVOptions(const CodeGenOptions & CodeGenOpts,const LangOptions & LangOpts)481 getGCOVOptions(const CodeGenOptions &CodeGenOpts, const LangOptions &LangOpts) {
482 if (CodeGenOpts.CoverageNotesFile.empty() &&
483 CodeGenOpts.CoverageDataFile.empty())
484 return std::nullopt;
485 // Not using 'GCOVOptions::getDefault' allows us to avoid exiting if
486 // LLVM's -default-gcov-version flag is set to something invalid.
487 GCOVOptions Options;
488 Options.EmitNotes = !CodeGenOpts.CoverageNotesFile.empty();
489 Options.EmitData = !CodeGenOpts.CoverageDataFile.empty();
490 llvm::copy(CodeGenOpts.CoverageVersion, std::begin(Options.Version));
491 Options.NoRedZone = CodeGenOpts.DisableRedZone;
492 Options.Filter = CodeGenOpts.ProfileFilterFiles;
493 Options.Exclude = CodeGenOpts.ProfileExcludeFiles;
494 Options.Atomic = CodeGenOpts.AtomicProfileUpdate;
495 return Options;
496 }
497
498 static std::optional<InstrProfOptions>
getInstrProfOptions(const CodeGenOptions & CodeGenOpts,const LangOptions & LangOpts)499 getInstrProfOptions(const CodeGenOptions &CodeGenOpts,
500 const LangOptions &LangOpts) {
501 if (!CodeGenOpts.hasProfileClangInstr())
502 return std::nullopt;
503 InstrProfOptions Options;
504 Options.NoRedZone = CodeGenOpts.DisableRedZone;
505 Options.InstrProfileOutput = CodeGenOpts.InstrProfileOutput;
506 Options.Atomic = CodeGenOpts.AtomicProfileUpdate;
507 return Options;
508 }
509
setCommandLineOpts(const CodeGenOptions & CodeGenOpts)510 static void setCommandLineOpts(const CodeGenOptions &CodeGenOpts) {
511 SmallVector<const char *, 16> BackendArgs;
512 BackendArgs.push_back("clang"); // Fake program name.
513 if (!CodeGenOpts.DebugPass.empty()) {
514 BackendArgs.push_back("-debug-pass");
515 BackendArgs.push_back(CodeGenOpts.DebugPass.c_str());
516 }
517 if (!CodeGenOpts.LimitFloatPrecision.empty()) {
518 BackendArgs.push_back("-limit-float-precision");
519 BackendArgs.push_back(CodeGenOpts.LimitFloatPrecision.c_str());
520 }
521 // Check for the default "clang" invocation that won't set any cl::opt values.
522 // Skip trying to parse the command line invocation to avoid the issues
523 // described below.
524 if (BackendArgs.size() == 1)
525 return;
526 BackendArgs.push_back(nullptr);
527 // FIXME: The command line parser below is not thread-safe and shares a global
528 // state, so this call might crash or overwrite the options of another Clang
529 // instance in the same process.
530 llvm::cl::ParseCommandLineOptions(BackendArgs.size() - 1,
531 BackendArgs.data());
532 }
533
CreateTargetMachine(bool MustCreateTM)534 void EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
535 // Create the TargetMachine for generating code.
536 std::string Error;
537 std::string Triple = TheModule->getTargetTriple();
538 const llvm::Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
539 if (!TheTarget) {
540 if (MustCreateTM)
541 Diags.Report(diag::err_fe_unable_to_create_target) << Error;
542 return;
543 }
544
545 std::optional<llvm::CodeModel::Model> CM = getCodeModel(CodeGenOpts);
546 std::string FeaturesStr =
547 llvm::join(TargetOpts.Features.begin(), TargetOpts.Features.end(), ",");
548 llvm::Reloc::Model RM = CodeGenOpts.RelocationModel;
549 std::optional<CodeGenOptLevel> OptLevelOrNone =
550 CodeGenOpt::getLevel(CodeGenOpts.OptimizationLevel);
551 assert(OptLevelOrNone && "Invalid optimization level!");
552 CodeGenOptLevel OptLevel = *OptLevelOrNone;
553
554 llvm::TargetOptions Options;
555 if (!initTargetOptions(Diags, Options, CodeGenOpts, TargetOpts, LangOpts,
556 HSOpts))
557 return;
558 TM.reset(TheTarget->createTargetMachine(Triple, TargetOpts.CPU, FeaturesStr,
559 Options, RM, CM, OptLevel));
560 TM->setLargeDataThreshold(CodeGenOpts.LargeDataThreshold);
561 }
562
AddEmitPasses(legacy::PassManager & CodeGenPasses,BackendAction Action,raw_pwrite_stream & OS,raw_pwrite_stream * DwoOS)563 bool EmitAssemblyHelper::AddEmitPasses(legacy::PassManager &CodeGenPasses,
564 BackendAction Action,
565 raw_pwrite_stream &OS,
566 raw_pwrite_stream *DwoOS) {
567 // Add LibraryInfo.
568 std::unique_ptr<TargetLibraryInfoImpl> TLII(
569 llvm::driver::createTLII(TargetTriple, CodeGenOpts.getVecLib()));
570 CodeGenPasses.add(new TargetLibraryInfoWrapperPass(*TLII));
571
572 // Normal mode, emit a .s or .o file by running the code generator. Note,
573 // this also adds codegenerator level optimization passes.
574 CodeGenFileType CGFT = getCodeGenFileType(Action);
575
576 // Add ObjC ARC final-cleanup optimizations. This is done as part of the
577 // "codegen" passes so that it isn't run multiple times when there is
578 // inlining happening.
579 if (CodeGenOpts.OptimizationLevel > 0)
580 CodeGenPasses.add(createObjCARCContractPass());
581
582 if (TM->addPassesToEmitFile(CodeGenPasses, OS, DwoOS, CGFT,
583 /*DisableVerify=*/!CodeGenOpts.VerifyModule)) {
584 Diags.Report(diag::err_fe_unable_to_interface_with_target);
585 return false;
586 }
587
588 return true;
589 }
590
mapToLevel(const CodeGenOptions & Opts)591 static OptimizationLevel mapToLevel(const CodeGenOptions &Opts) {
592 switch (Opts.OptimizationLevel) {
593 default:
594 llvm_unreachable("Invalid optimization level!");
595
596 case 0:
597 return OptimizationLevel::O0;
598
599 case 1:
600 return OptimizationLevel::O1;
601
602 case 2:
603 switch (Opts.OptimizeSize) {
604 default:
605 llvm_unreachable("Invalid optimization level for size!");
606
607 case 0:
608 return OptimizationLevel::O2;
609
610 case 1:
611 return OptimizationLevel::Os;
612
613 case 2:
614 return OptimizationLevel::Oz;
615 }
616
617 case 3:
618 return OptimizationLevel::O3;
619 }
620 }
621
addKCFIPass(const Triple & TargetTriple,const LangOptions & LangOpts,PassBuilder & PB)622 static void addKCFIPass(const Triple &TargetTriple, const LangOptions &LangOpts,
623 PassBuilder &PB) {
624 // If the back-end supports KCFI operand bundle lowering, skip KCFIPass.
625 if (TargetTriple.getArch() == llvm::Triple::x86_64 ||
626 TargetTriple.isAArch64(64) || TargetTriple.isRISCV())
627 return;
628
629 // Ensure we lower KCFI operand bundles with -O0.
630 PB.registerOptimizerLastEPCallback(
631 [&](ModulePassManager &MPM, OptimizationLevel Level) {
632 if (Level == OptimizationLevel::O0 &&
633 LangOpts.Sanitize.has(SanitizerKind::KCFI))
634 MPM.addPass(createModuleToFunctionPassAdaptor(KCFIPass()));
635 });
636
637 // When optimizations are requested, run KCIFPass after InstCombine to
638 // avoid unnecessary checks.
639 PB.registerPeepholeEPCallback(
640 [&](FunctionPassManager &FPM, OptimizationLevel Level) {
641 if (Level != OptimizationLevel::O0 &&
642 LangOpts.Sanitize.has(SanitizerKind::KCFI))
643 FPM.addPass(KCFIPass());
644 });
645 }
646
addSanitizers(const Triple & TargetTriple,const CodeGenOptions & CodeGenOpts,const LangOptions & LangOpts,PassBuilder & PB)647 static void addSanitizers(const Triple &TargetTriple,
648 const CodeGenOptions &CodeGenOpts,
649 const LangOptions &LangOpts, PassBuilder &PB) {
650 auto SanitizersCallback = [&](ModulePassManager &MPM,
651 OptimizationLevel Level) {
652 if (CodeGenOpts.hasSanitizeCoverage()) {
653 auto SancovOpts = getSancovOptsFromCGOpts(CodeGenOpts);
654 MPM.addPass(SanitizerCoveragePass(
655 SancovOpts, CodeGenOpts.SanitizeCoverageAllowlistFiles,
656 CodeGenOpts.SanitizeCoverageIgnorelistFiles));
657 }
658
659 if (CodeGenOpts.hasSanitizeBinaryMetadata()) {
660 MPM.addPass(SanitizerBinaryMetadataPass(
661 getSanitizerBinaryMetadataOptions(CodeGenOpts),
662 CodeGenOpts.SanitizeMetadataIgnorelistFiles));
663 }
664
665 auto MSanPass = [&](SanitizerMask Mask, bool CompileKernel) {
666 if (LangOpts.Sanitize.has(Mask)) {
667 int TrackOrigins = CodeGenOpts.SanitizeMemoryTrackOrigins;
668 bool Recover = CodeGenOpts.SanitizeRecover.has(Mask);
669
670 MemorySanitizerOptions options(TrackOrigins, Recover, CompileKernel,
671 CodeGenOpts.SanitizeMemoryParamRetval);
672 MPM.addPass(MemorySanitizerPass(options));
673 if (Level != OptimizationLevel::O0) {
674 // MemorySanitizer inserts complex instrumentation that mostly follows
675 // the logic of the original code, but operates on "shadow" values. It
676 // can benefit from re-running some general purpose optimization
677 // passes.
678 MPM.addPass(RequireAnalysisPass<GlobalsAA, llvm::Module>());
679 FunctionPassManager FPM;
680 FPM.addPass(EarlyCSEPass(true /* Enable mem-ssa. */));
681 FPM.addPass(InstCombinePass());
682 FPM.addPass(JumpThreadingPass());
683 FPM.addPass(GVNPass());
684 FPM.addPass(InstCombinePass());
685 MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
686 }
687 }
688 };
689 MSanPass(SanitizerKind::Memory, false);
690 MSanPass(SanitizerKind::KernelMemory, true);
691
692 if (LangOpts.Sanitize.has(SanitizerKind::Thread)) {
693 MPM.addPass(ModuleThreadSanitizerPass());
694 MPM.addPass(createModuleToFunctionPassAdaptor(ThreadSanitizerPass()));
695 }
696
697 auto ASanPass = [&](SanitizerMask Mask, bool CompileKernel) {
698 if (LangOpts.Sanitize.has(Mask)) {
699 bool UseGlobalGC = asanUseGlobalsGC(TargetTriple, CodeGenOpts);
700 bool UseOdrIndicator = CodeGenOpts.SanitizeAddressUseOdrIndicator;
701 llvm::AsanDtorKind DestructorKind =
702 CodeGenOpts.getSanitizeAddressDtor();
703 AddressSanitizerOptions Opts;
704 Opts.CompileKernel = CompileKernel;
705 Opts.Recover = CodeGenOpts.SanitizeRecover.has(Mask);
706 Opts.UseAfterScope = CodeGenOpts.SanitizeAddressUseAfterScope;
707 Opts.UseAfterReturn = CodeGenOpts.getSanitizeAddressUseAfterReturn();
708 MPM.addPass(AddressSanitizerPass(Opts, UseGlobalGC, UseOdrIndicator,
709 DestructorKind));
710 }
711 };
712 ASanPass(SanitizerKind::Address, false);
713 ASanPass(SanitizerKind::KernelAddress, true);
714
715 auto HWASanPass = [&](SanitizerMask Mask, bool CompileKernel) {
716 if (LangOpts.Sanitize.has(Mask)) {
717 bool Recover = CodeGenOpts.SanitizeRecover.has(Mask);
718 MPM.addPass(HWAddressSanitizerPass(
719 {CompileKernel, Recover,
720 /*DisableOptimization=*/CodeGenOpts.OptimizationLevel == 0}));
721 }
722 };
723 HWASanPass(SanitizerKind::HWAddress, false);
724 HWASanPass(SanitizerKind::KernelHWAddress, true);
725
726 if (LangOpts.Sanitize.has(SanitizerKind::DataFlow)) {
727 MPM.addPass(DataFlowSanitizerPass(LangOpts.NoSanitizeFiles));
728 }
729 };
730 if (ClSanitizeOnOptimizerEarlyEP) {
731 PB.registerOptimizerEarlyEPCallback(
732 [SanitizersCallback](ModulePassManager &MPM, OptimizationLevel Level) {
733 ModulePassManager NewMPM;
734 SanitizersCallback(NewMPM, Level);
735 if (!NewMPM.isEmpty()) {
736 // Sanitizers can abandon<GlobalsAA>.
737 NewMPM.addPass(RequireAnalysisPass<GlobalsAA, llvm::Module>());
738 MPM.addPass(std::move(NewMPM));
739 }
740 });
741 } else {
742 // LastEP does not need GlobalsAA.
743 PB.registerOptimizerLastEPCallback(SanitizersCallback);
744 }
745 }
746
RunOptimizationPipeline(BackendAction Action,std::unique_ptr<raw_pwrite_stream> & OS,std::unique_ptr<llvm::ToolOutputFile> & ThinLinkOS,BackendConsumer * BC)747 void EmitAssemblyHelper::RunOptimizationPipeline(
748 BackendAction Action, std::unique_ptr<raw_pwrite_stream> &OS,
749 std::unique_ptr<llvm::ToolOutputFile> &ThinLinkOS, BackendConsumer *BC) {
750 std::optional<PGOOptions> PGOOpt;
751
752 if (CodeGenOpts.hasProfileIRInstr())
753 // -fprofile-generate.
754 PGOOpt = PGOOptions(
755 CodeGenOpts.InstrProfileOutput.empty() ? getDefaultProfileGenName()
756 : CodeGenOpts.InstrProfileOutput,
757 "", "", CodeGenOpts.MemoryProfileUsePath, nullptr, PGOOptions::IRInstr,
758 PGOOptions::NoCSAction, CodeGenOpts.DebugInfoForProfiling,
759 /*PseudoProbeForProfiling=*/false, CodeGenOpts.AtomicProfileUpdate);
760 else if (CodeGenOpts.hasProfileIRUse()) {
761 // -fprofile-use.
762 auto CSAction = CodeGenOpts.hasProfileCSIRUse() ? PGOOptions::CSIRUse
763 : PGOOptions::NoCSAction;
764 PGOOpt = PGOOptions(
765 CodeGenOpts.ProfileInstrumentUsePath, "",
766 CodeGenOpts.ProfileRemappingFile, CodeGenOpts.MemoryProfileUsePath, VFS,
767 PGOOptions::IRUse, CSAction, CodeGenOpts.DebugInfoForProfiling);
768 } else if (!CodeGenOpts.SampleProfileFile.empty())
769 // -fprofile-sample-use
770 PGOOpt = PGOOptions(
771 CodeGenOpts.SampleProfileFile, "", CodeGenOpts.ProfileRemappingFile,
772 CodeGenOpts.MemoryProfileUsePath, VFS, PGOOptions::SampleUse,
773 PGOOptions::NoCSAction, CodeGenOpts.DebugInfoForProfiling,
774 CodeGenOpts.PseudoProbeForProfiling);
775 else if (!CodeGenOpts.MemoryProfileUsePath.empty())
776 // -fmemory-profile-use (without any of the above options)
777 PGOOpt = PGOOptions("", "", "", CodeGenOpts.MemoryProfileUsePath, VFS,
778 PGOOptions::NoAction, PGOOptions::NoCSAction,
779 CodeGenOpts.DebugInfoForProfiling);
780 else if (CodeGenOpts.PseudoProbeForProfiling)
781 // -fpseudo-probe-for-profiling
782 PGOOpt = PGOOptions("", "", "", /*MemoryProfile=*/"", nullptr,
783 PGOOptions::NoAction, PGOOptions::NoCSAction,
784 CodeGenOpts.DebugInfoForProfiling, true);
785 else if (CodeGenOpts.DebugInfoForProfiling)
786 // -fdebug-info-for-profiling
787 PGOOpt = PGOOptions("", "", "", /*MemoryProfile=*/"", nullptr,
788 PGOOptions::NoAction, PGOOptions::NoCSAction, true);
789
790 // Check to see if we want to generate a CS profile.
791 if (CodeGenOpts.hasProfileCSIRInstr()) {
792 assert(!CodeGenOpts.hasProfileCSIRUse() &&
793 "Cannot have both CSProfileUse pass and CSProfileGen pass at "
794 "the same time");
795 if (PGOOpt) {
796 assert(PGOOpt->Action != PGOOptions::IRInstr &&
797 PGOOpt->Action != PGOOptions::SampleUse &&
798 "Cannot run CSProfileGen pass with ProfileGen or SampleUse "
799 " pass");
800 PGOOpt->CSProfileGenFile = CodeGenOpts.InstrProfileOutput.empty()
801 ? getDefaultProfileGenName()
802 : CodeGenOpts.InstrProfileOutput;
803 PGOOpt->CSAction = PGOOptions::CSIRInstr;
804 } else
805 PGOOpt =
806 PGOOptions("",
807 CodeGenOpts.InstrProfileOutput.empty()
808 ? getDefaultProfileGenName()
809 : CodeGenOpts.InstrProfileOutput,
810 "", /*MemoryProfile=*/"", nullptr, PGOOptions::NoAction,
811 PGOOptions::CSIRInstr, CodeGenOpts.DebugInfoForProfiling);
812 }
813 if (TM)
814 TM->setPGOOption(PGOOpt);
815
816 PipelineTuningOptions PTO;
817 PTO.LoopUnrolling = CodeGenOpts.UnrollLoops;
818 // For historical reasons, loop interleaving is set to mirror setting for loop
819 // unrolling.
820 PTO.LoopInterleaving = CodeGenOpts.UnrollLoops;
821 PTO.LoopVectorization = CodeGenOpts.VectorizeLoop;
822 PTO.SLPVectorization = CodeGenOpts.VectorizeSLP;
823 PTO.MergeFunctions = CodeGenOpts.MergeFunctions;
824 // Only enable CGProfilePass when using integrated assembler, since
825 // non-integrated assemblers don't recognize .cgprofile section.
826 PTO.CallGraphProfile = !CodeGenOpts.DisableIntegratedAS;
827 PTO.UnifiedLTO = CodeGenOpts.UnifiedLTO;
828
829 LoopAnalysisManager LAM;
830 FunctionAnalysisManager FAM;
831 CGSCCAnalysisManager CGAM;
832 ModuleAnalysisManager MAM;
833
834 bool DebugPassStructure = CodeGenOpts.DebugPass == "Structure";
835 PassInstrumentationCallbacks PIC;
836 PrintPassOptions PrintPassOpts;
837 PrintPassOpts.Indent = DebugPassStructure;
838 PrintPassOpts.SkipAnalyses = DebugPassStructure;
839 StandardInstrumentations SI(
840 TheModule->getContext(),
841 (CodeGenOpts.DebugPassManager || DebugPassStructure),
842 CodeGenOpts.VerifyEach, PrintPassOpts);
843 SI.registerCallbacks(PIC, &MAM);
844 PassBuilder PB(TM.get(), PTO, PGOOpt, &PIC);
845
846 // Handle the assignment tracking feature options.
847 switch (CodeGenOpts.getAssignmentTrackingMode()) {
848 case CodeGenOptions::AssignmentTrackingOpts::Forced:
849 PB.registerPipelineStartEPCallback(
850 [&](ModulePassManager &MPM, OptimizationLevel Level) {
851 MPM.addPass(AssignmentTrackingPass());
852 });
853 break;
854 case CodeGenOptions::AssignmentTrackingOpts::Enabled:
855 // Disable assignment tracking in LTO builds for now as the performance
856 // cost is too high. Disable for LLDB tuning due to llvm.org/PR43126.
857 if (!CodeGenOpts.PrepareForThinLTO && !CodeGenOpts.PrepareForLTO &&
858 CodeGenOpts.getDebuggerTuning() != llvm::DebuggerKind::LLDB) {
859 PB.registerPipelineStartEPCallback(
860 [&](ModulePassManager &MPM, OptimizationLevel Level) {
861 // Only use assignment tracking if optimisations are enabled.
862 if (Level != OptimizationLevel::O0)
863 MPM.addPass(AssignmentTrackingPass());
864 });
865 }
866 break;
867 case CodeGenOptions::AssignmentTrackingOpts::Disabled:
868 break;
869 }
870
871 // Enable verify-debuginfo-preserve-each for new PM.
872 DebugifyEachInstrumentation Debugify;
873 DebugInfoPerPass DebugInfoBeforePass;
874 if (CodeGenOpts.EnableDIPreservationVerify) {
875 Debugify.setDebugifyMode(DebugifyMode::OriginalDebugInfo);
876 Debugify.setDebugInfoBeforePass(DebugInfoBeforePass);
877
878 if (!CodeGenOpts.DIBugsReportFilePath.empty())
879 Debugify.setOrigDIVerifyBugsReportFilePath(
880 CodeGenOpts.DIBugsReportFilePath);
881 Debugify.registerCallbacks(PIC, MAM);
882 }
883 // Attempt to load pass plugins and register their callbacks with PB.
884 for (auto &PluginFN : CodeGenOpts.PassPlugins) {
885 auto PassPlugin = PassPlugin::Load(PluginFN);
886 if (PassPlugin) {
887 PassPlugin->registerPassBuilderCallbacks(PB);
888 } else {
889 Diags.Report(diag::err_fe_unable_to_load_plugin)
890 << PluginFN << toString(PassPlugin.takeError());
891 }
892 }
893 for (const auto &PassCallback : CodeGenOpts.PassBuilderCallbacks)
894 PassCallback(PB);
895 #define HANDLE_EXTENSION(Ext) \
896 get##Ext##PluginInfo().RegisterPassBuilderCallbacks(PB);
897 #include "llvm/Support/Extension.def"
898
899 // Register the target library analysis directly and give it a customized
900 // preset TLI.
901 std::unique_ptr<TargetLibraryInfoImpl> TLII(
902 llvm::driver::createTLII(TargetTriple, CodeGenOpts.getVecLib()));
903 FAM.registerPass([&] { return TargetLibraryAnalysis(*TLII); });
904
905 // Register all the basic analyses with the managers.
906 PB.registerModuleAnalyses(MAM);
907 PB.registerCGSCCAnalyses(CGAM);
908 PB.registerFunctionAnalyses(FAM);
909 PB.registerLoopAnalyses(LAM);
910 PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
911
912 ModulePassManager MPM;
913 // Add a verifier pass, before any other passes, to catch CodeGen issues.
914 if (CodeGenOpts.VerifyModule)
915 MPM.addPass(VerifierPass());
916
917 if (!CodeGenOpts.DisableLLVMPasses) {
918 // Map our optimization levels into one of the distinct levels used to
919 // configure the pipeline.
920 OptimizationLevel Level = mapToLevel(CodeGenOpts);
921
922 const bool PrepareForThinLTO = CodeGenOpts.PrepareForThinLTO;
923 const bool PrepareForLTO = CodeGenOpts.PrepareForLTO;
924
925 if (LangOpts.ObjCAutoRefCount) {
926 PB.registerPipelineStartEPCallback(
927 [](ModulePassManager &MPM, OptimizationLevel Level) {
928 if (Level != OptimizationLevel::O0)
929 MPM.addPass(
930 createModuleToFunctionPassAdaptor(ObjCARCExpandPass()));
931 });
932 PB.registerPipelineEarlySimplificationEPCallback(
933 [](ModulePassManager &MPM, OptimizationLevel Level) {
934 if (Level != OptimizationLevel::O0)
935 MPM.addPass(ObjCARCAPElimPass());
936 });
937 PB.registerScalarOptimizerLateEPCallback(
938 [](FunctionPassManager &FPM, OptimizationLevel Level) {
939 if (Level != OptimizationLevel::O0)
940 FPM.addPass(ObjCARCOptPass());
941 });
942 }
943
944 // If we reached here with a non-empty index file name, then the index
945 // file was empty and we are not performing ThinLTO backend compilation
946 // (used in testing in a distributed build environment).
947 bool IsThinLTOPostLink = !CodeGenOpts.ThinLTOIndexFile.empty();
948 // If so drop any the type test assume sequences inserted for whole program
949 // vtables so that codegen doesn't complain.
950 if (IsThinLTOPostLink)
951 PB.registerPipelineStartEPCallback(
952 [](ModulePassManager &MPM, OptimizationLevel Level) {
953 MPM.addPass(LowerTypeTestsPass(/*ExportSummary=*/nullptr,
954 /*ImportSummary=*/nullptr,
955 /*DropTypeTests=*/true));
956 });
957
958 if (CodeGenOpts.InstrumentFunctions ||
959 CodeGenOpts.InstrumentFunctionEntryBare ||
960 CodeGenOpts.InstrumentFunctionsAfterInlining ||
961 CodeGenOpts.InstrumentForProfiling) {
962 PB.registerPipelineStartEPCallback(
963 [](ModulePassManager &MPM, OptimizationLevel Level) {
964 MPM.addPass(createModuleToFunctionPassAdaptor(
965 EntryExitInstrumenterPass(/*PostInlining=*/false)));
966 });
967 PB.registerOptimizerLastEPCallback(
968 [](ModulePassManager &MPM, OptimizationLevel Level) {
969 MPM.addPass(createModuleToFunctionPassAdaptor(
970 EntryExitInstrumenterPass(/*PostInlining=*/true)));
971 });
972 }
973
974 // Register callbacks to schedule sanitizer passes at the appropriate part
975 // of the pipeline.
976 if (LangOpts.Sanitize.has(SanitizerKind::LocalBounds))
977 PB.registerScalarOptimizerLateEPCallback(
978 [](FunctionPassManager &FPM, OptimizationLevel Level) {
979 FPM.addPass(BoundsCheckingPass());
980 });
981
982 // Don't add sanitizers if we are here from ThinLTO PostLink. That already
983 // done on PreLink stage.
984 if (!IsThinLTOPostLink) {
985 addSanitizers(TargetTriple, CodeGenOpts, LangOpts, PB);
986 addKCFIPass(TargetTriple, LangOpts, PB);
987 }
988
989 if (std::optional<GCOVOptions> Options =
990 getGCOVOptions(CodeGenOpts, LangOpts))
991 PB.registerPipelineStartEPCallback(
992 [Options](ModulePassManager &MPM, OptimizationLevel Level) {
993 MPM.addPass(GCOVProfilerPass(*Options));
994 });
995 if (std::optional<InstrProfOptions> Options =
996 getInstrProfOptions(CodeGenOpts, LangOpts))
997 PB.registerPipelineStartEPCallback(
998 [Options](ModulePassManager &MPM, OptimizationLevel Level) {
999 MPM.addPass(InstrProfilingLoweringPass(*Options, false));
1000 });
1001
1002 // TODO: Consider passing the MemoryProfileOutput to the pass builder via
1003 // the PGOOptions, and set this up there.
1004 if (!CodeGenOpts.MemoryProfileOutput.empty()) {
1005 PB.registerOptimizerLastEPCallback(
1006 [](ModulePassManager &MPM, OptimizationLevel Level) {
1007 MPM.addPass(createModuleToFunctionPassAdaptor(MemProfilerPass()));
1008 MPM.addPass(ModuleMemProfilerPass());
1009 });
1010 }
1011
1012 if (CodeGenOpts.FatLTO) {
1013 MPM.addPass(PB.buildFatLTODefaultPipeline(
1014 Level, PrepareForThinLTO,
1015 PrepareForThinLTO || shouldEmitRegularLTOSummary()));
1016 } else if (PrepareForThinLTO) {
1017 MPM.addPass(PB.buildThinLTOPreLinkDefaultPipeline(Level));
1018 } else if (PrepareForLTO) {
1019 MPM.addPass(PB.buildLTOPreLinkDefaultPipeline(Level));
1020 } else {
1021 MPM.addPass(PB.buildPerModuleDefaultPipeline(Level));
1022 }
1023 }
1024
1025 // Re-link against any bitcodes supplied via the -mlink-builtin-bitcode option
1026 // Some optimizations may generate new function calls that would not have
1027 // been linked pre-optimization (i.e. fused sincos calls generated by
1028 // AMDGPULibCalls::fold_sincos.)
1029 if (ClRelinkBuiltinBitcodePostop)
1030 MPM.addPass(LinkInModulesPass(BC, false));
1031
1032 // Add a verifier pass if requested. We don't have to do this if the action
1033 // requires code generation because there will already be a verifier pass in
1034 // the code-generation pipeline.
1035 // Since we already added a verifier pass above, this
1036 // might even not run the analysis, if previous passes caused no changes.
1037 if (!actionRequiresCodeGen(Action) && CodeGenOpts.VerifyModule)
1038 MPM.addPass(VerifierPass());
1039
1040 if (Action == Backend_EmitBC || Action == Backend_EmitLL ||
1041 CodeGenOpts.FatLTO) {
1042 if (CodeGenOpts.PrepareForThinLTO && !CodeGenOpts.DisableLLVMPasses) {
1043 if (!TheModule->getModuleFlag("EnableSplitLTOUnit"))
1044 TheModule->addModuleFlag(llvm::Module::Error, "EnableSplitLTOUnit",
1045 CodeGenOpts.EnableSplitLTOUnit);
1046 if (Action == Backend_EmitBC) {
1047 if (!CodeGenOpts.ThinLinkBitcodeFile.empty()) {
1048 ThinLinkOS = openOutputFile(CodeGenOpts.ThinLinkBitcodeFile);
1049 if (!ThinLinkOS)
1050 return;
1051 }
1052 MPM.addPass(ThinLTOBitcodeWriterPass(
1053 *OS, ThinLinkOS ? &ThinLinkOS->os() : nullptr));
1054 } else if (Action == Backend_EmitLL) {
1055 MPM.addPass(PrintModulePass(*OS, "", CodeGenOpts.EmitLLVMUseLists,
1056 /*EmitLTOSummary=*/true));
1057 }
1058 } else {
1059 // Emit a module summary by default for Regular LTO except for ld64
1060 // targets
1061 bool EmitLTOSummary = shouldEmitRegularLTOSummary();
1062 if (EmitLTOSummary) {
1063 if (!TheModule->getModuleFlag("ThinLTO") && !CodeGenOpts.UnifiedLTO)
1064 TheModule->addModuleFlag(llvm::Module::Error, "ThinLTO", uint32_t(0));
1065 if (!TheModule->getModuleFlag("EnableSplitLTOUnit"))
1066 TheModule->addModuleFlag(llvm::Module::Error, "EnableSplitLTOUnit",
1067 uint32_t(1));
1068 }
1069 if (Action == Backend_EmitBC) {
1070 MPM.addPass(BitcodeWriterPass(*OS, CodeGenOpts.EmitLLVMUseLists,
1071 EmitLTOSummary));
1072 } else if (Action == Backend_EmitLL) {
1073 MPM.addPass(PrintModulePass(*OS, "", CodeGenOpts.EmitLLVMUseLists,
1074 EmitLTOSummary));
1075 }
1076 }
1077
1078 if (shouldEmitUnifiedLTOModueFlag())
1079 TheModule->addModuleFlag(llvm::Module::Error, "UnifiedLTO", uint32_t(1));
1080 }
1081
1082 // Print a textual, '-passes=' compatible, representation of pipeline if
1083 // requested.
1084 if (PrintPipelinePasses) {
1085 MPM.printPipeline(outs(), [&PIC](StringRef ClassName) {
1086 auto PassName = PIC.getPassNameForClassName(ClassName);
1087 return PassName.empty() ? ClassName : PassName;
1088 });
1089 outs() << "\n";
1090 return;
1091 }
1092
1093 if (LangOpts.HIPStdPar && !LangOpts.CUDAIsDevice &&
1094 LangOpts.HIPStdParInterposeAlloc)
1095 MPM.addPass(HipStdParAllocationInterpositionPass());
1096
1097 // Now that we have all of the passes ready, run them.
1098 {
1099 PrettyStackTraceString CrashInfo("Optimizer");
1100 llvm::TimeTraceScope TimeScope("Optimizer");
1101 MPM.run(*TheModule, MAM);
1102 }
1103 }
1104
RunCodegenPipeline(BackendAction Action,std::unique_ptr<raw_pwrite_stream> & OS,std::unique_ptr<llvm::ToolOutputFile> & DwoOS)1105 void EmitAssemblyHelper::RunCodegenPipeline(
1106 BackendAction Action, std::unique_ptr<raw_pwrite_stream> &OS,
1107 std::unique_ptr<llvm::ToolOutputFile> &DwoOS) {
1108 // We still use the legacy PM to run the codegen pipeline since the new PM
1109 // does not work with the codegen pipeline.
1110 // FIXME: make the new PM work with the codegen pipeline.
1111 legacy::PassManager CodeGenPasses;
1112
1113 // Append any output we need to the pass manager.
1114 switch (Action) {
1115 case Backend_EmitAssembly:
1116 case Backend_EmitMCNull:
1117 case Backend_EmitObj:
1118 CodeGenPasses.add(
1119 createTargetTransformInfoWrapperPass(getTargetIRAnalysis()));
1120 if (!CodeGenOpts.SplitDwarfOutput.empty()) {
1121 DwoOS = openOutputFile(CodeGenOpts.SplitDwarfOutput);
1122 if (!DwoOS)
1123 return;
1124 }
1125 if (!AddEmitPasses(CodeGenPasses, Action, *OS,
1126 DwoOS ? &DwoOS->os() : nullptr))
1127 // FIXME: Should we handle this error differently?
1128 return;
1129 break;
1130 default:
1131 return;
1132 }
1133
1134 // If -print-pipeline-passes is requested, don't run the legacy pass manager.
1135 // FIXME: when codegen is switched to use the new pass manager, it should also
1136 // emit pass names here.
1137 if (PrintPipelinePasses) {
1138 return;
1139 }
1140
1141 {
1142 PrettyStackTraceString CrashInfo("Code generation");
1143 llvm::TimeTraceScope TimeScope("CodeGenPasses");
1144 CodeGenPasses.run(*TheModule);
1145 }
1146 }
1147
EmitAssembly(BackendAction Action,std::unique_ptr<raw_pwrite_stream> OS,BackendConsumer * BC)1148 void EmitAssemblyHelper::EmitAssembly(BackendAction Action,
1149 std::unique_ptr<raw_pwrite_stream> OS,
1150 BackendConsumer *BC) {
1151 TimeRegion Region(CodeGenOpts.TimePasses ? &CodeGenerationTime : nullptr);
1152 setCommandLineOpts(CodeGenOpts);
1153
1154 bool RequiresCodeGen = actionRequiresCodeGen(Action);
1155 CreateTargetMachine(RequiresCodeGen);
1156
1157 if (RequiresCodeGen && !TM)
1158 return;
1159 if (TM)
1160 TheModule->setDataLayout(TM->createDataLayout());
1161
1162 // Before executing passes, print the final values of the LLVM options.
1163 cl::PrintOptionValues();
1164
1165 std::unique_ptr<llvm::ToolOutputFile> ThinLinkOS, DwoOS;
1166 RunOptimizationPipeline(Action, OS, ThinLinkOS, BC);
1167 RunCodegenPipeline(Action, OS, DwoOS);
1168
1169 if (ThinLinkOS)
1170 ThinLinkOS->keep();
1171 if (DwoOS)
1172 DwoOS->keep();
1173 }
1174
runThinLTOBackend(DiagnosticsEngine & Diags,ModuleSummaryIndex * CombinedIndex,llvm::Module * M,const HeaderSearchOptions & HeaderOpts,const CodeGenOptions & CGOpts,const clang::TargetOptions & TOpts,const LangOptions & LOpts,std::unique_ptr<raw_pwrite_stream> OS,std::string SampleProfile,std::string ProfileRemapping,BackendAction Action)1175 static void runThinLTOBackend(
1176 DiagnosticsEngine &Diags, ModuleSummaryIndex *CombinedIndex,
1177 llvm::Module *M, const HeaderSearchOptions &HeaderOpts,
1178 const CodeGenOptions &CGOpts, const clang::TargetOptions &TOpts,
1179 const LangOptions &LOpts, std::unique_ptr<raw_pwrite_stream> OS,
1180 std::string SampleProfile, std::string ProfileRemapping,
1181 BackendAction Action) {
1182 DenseMap<StringRef, DenseMap<GlobalValue::GUID, GlobalValueSummary *>>
1183 ModuleToDefinedGVSummaries;
1184 CombinedIndex->collectDefinedGVSummariesPerModule(ModuleToDefinedGVSummaries);
1185
1186 setCommandLineOpts(CGOpts);
1187
1188 // We can simply import the values mentioned in the combined index, since
1189 // we should only invoke this using the individual indexes written out
1190 // via a WriteIndexesThinBackend.
1191 FunctionImporter::ImportMapTy ImportList;
1192 if (!lto::initImportList(*M, *CombinedIndex, ImportList))
1193 return;
1194
1195 auto AddStream = [&](size_t Task, const Twine &ModuleName) {
1196 return std::make_unique<CachedFileStream>(std::move(OS),
1197 CGOpts.ObjectFilenameForDebug);
1198 };
1199 lto::Config Conf;
1200 if (CGOpts.SaveTempsFilePrefix != "") {
1201 if (Error E = Conf.addSaveTemps(CGOpts.SaveTempsFilePrefix + ".",
1202 /* UseInputModulePath */ false)) {
1203 handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
1204 errs() << "Error setting up ThinLTO save-temps: " << EIB.message()
1205 << '\n';
1206 });
1207 }
1208 }
1209 Conf.CPU = TOpts.CPU;
1210 Conf.CodeModel = getCodeModel(CGOpts);
1211 Conf.MAttrs = TOpts.Features;
1212 Conf.RelocModel = CGOpts.RelocationModel;
1213 std::optional<CodeGenOptLevel> OptLevelOrNone =
1214 CodeGenOpt::getLevel(CGOpts.OptimizationLevel);
1215 assert(OptLevelOrNone && "Invalid optimization level!");
1216 Conf.CGOptLevel = *OptLevelOrNone;
1217 Conf.OptLevel = CGOpts.OptimizationLevel;
1218 initTargetOptions(Diags, Conf.Options, CGOpts, TOpts, LOpts, HeaderOpts);
1219 Conf.SampleProfile = std::move(SampleProfile);
1220 Conf.PTO.LoopUnrolling = CGOpts.UnrollLoops;
1221 // For historical reasons, loop interleaving is set to mirror setting for loop
1222 // unrolling.
1223 Conf.PTO.LoopInterleaving = CGOpts.UnrollLoops;
1224 Conf.PTO.LoopVectorization = CGOpts.VectorizeLoop;
1225 Conf.PTO.SLPVectorization = CGOpts.VectorizeSLP;
1226 // Only enable CGProfilePass when using integrated assembler, since
1227 // non-integrated assemblers don't recognize .cgprofile section.
1228 Conf.PTO.CallGraphProfile = !CGOpts.DisableIntegratedAS;
1229
1230 // Context sensitive profile.
1231 if (CGOpts.hasProfileCSIRInstr()) {
1232 Conf.RunCSIRInstr = true;
1233 Conf.CSIRProfile = std::move(CGOpts.InstrProfileOutput);
1234 } else if (CGOpts.hasProfileCSIRUse()) {
1235 Conf.RunCSIRInstr = false;
1236 Conf.CSIRProfile = std::move(CGOpts.ProfileInstrumentUsePath);
1237 }
1238
1239 Conf.ProfileRemapping = std::move(ProfileRemapping);
1240 Conf.DebugPassManager = CGOpts.DebugPassManager;
1241 Conf.VerifyEach = CGOpts.VerifyEach;
1242 Conf.RemarksWithHotness = CGOpts.DiagnosticsWithHotness;
1243 Conf.RemarksFilename = CGOpts.OptRecordFile;
1244 Conf.RemarksPasses = CGOpts.OptRecordPasses;
1245 Conf.RemarksFormat = CGOpts.OptRecordFormat;
1246 Conf.SplitDwarfFile = CGOpts.SplitDwarfFile;
1247 Conf.SplitDwarfOutput = CGOpts.SplitDwarfOutput;
1248 switch (Action) {
1249 case Backend_EmitNothing:
1250 Conf.PreCodeGenModuleHook = [](size_t Task, const llvm::Module &Mod) {
1251 return false;
1252 };
1253 break;
1254 case Backend_EmitLL:
1255 Conf.PreCodeGenModuleHook = [&](size_t Task, const llvm::Module &Mod) {
1256 M->print(*OS, nullptr, CGOpts.EmitLLVMUseLists);
1257 return false;
1258 };
1259 break;
1260 case Backend_EmitBC:
1261 Conf.PreCodeGenModuleHook = [&](size_t Task, const llvm::Module &Mod) {
1262 WriteBitcodeToFile(*M, *OS, CGOpts.EmitLLVMUseLists);
1263 return false;
1264 };
1265 break;
1266 default:
1267 Conf.CGFileType = getCodeGenFileType(Action);
1268 break;
1269 }
1270 if (Error E =
1271 thinBackend(Conf, -1, AddStream, *M, *CombinedIndex, ImportList,
1272 ModuleToDefinedGVSummaries[M->getModuleIdentifier()],
1273 /* ModuleMap */ nullptr, CGOpts.CmdArgs)) {
1274 handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
1275 errs() << "Error running ThinLTO backend: " << EIB.message() << '\n';
1276 });
1277 }
1278 }
1279
EmitBackendOutput(DiagnosticsEngine & Diags,const HeaderSearchOptions & HeaderOpts,const CodeGenOptions & CGOpts,const clang::TargetOptions & TOpts,const LangOptions & LOpts,StringRef TDesc,llvm::Module * M,BackendAction Action,IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,std::unique_ptr<raw_pwrite_stream> OS,BackendConsumer * BC)1280 void clang::EmitBackendOutput(
1281 DiagnosticsEngine &Diags, const HeaderSearchOptions &HeaderOpts,
1282 const CodeGenOptions &CGOpts, const clang::TargetOptions &TOpts,
1283 const LangOptions &LOpts, StringRef TDesc, llvm::Module *M,
1284 BackendAction Action, IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
1285 std::unique_ptr<raw_pwrite_stream> OS, BackendConsumer *BC) {
1286
1287 llvm::TimeTraceScope TimeScope("Backend");
1288
1289 std::unique_ptr<llvm::Module> EmptyModule;
1290 if (!CGOpts.ThinLTOIndexFile.empty()) {
1291 // If we are performing a ThinLTO importing compile, load the function index
1292 // into memory and pass it into runThinLTOBackend, which will run the
1293 // function importer and invoke LTO passes.
1294 std::unique_ptr<ModuleSummaryIndex> CombinedIndex;
1295 if (Error E = llvm::getModuleSummaryIndexForFile(
1296 CGOpts.ThinLTOIndexFile,
1297 /*IgnoreEmptyThinLTOIndexFile*/ true)
1298 .moveInto(CombinedIndex)) {
1299 logAllUnhandledErrors(std::move(E), errs(),
1300 "Error loading index file '" +
1301 CGOpts.ThinLTOIndexFile + "': ");
1302 return;
1303 }
1304
1305 // A null CombinedIndex means we should skip ThinLTO compilation
1306 // (LLVM will optionally ignore empty index files, returning null instead
1307 // of an error).
1308 if (CombinedIndex) {
1309 if (!CombinedIndex->skipModuleByDistributedBackend()) {
1310 runThinLTOBackend(Diags, CombinedIndex.get(), M, HeaderOpts, CGOpts,
1311 TOpts, LOpts, std::move(OS), CGOpts.SampleProfileFile,
1312 CGOpts.ProfileRemappingFile, Action);
1313 return;
1314 }
1315 // Distributed indexing detected that nothing from the module is needed
1316 // for the final linking. So we can skip the compilation. We sill need to
1317 // output an empty object file to make sure that a linker does not fail
1318 // trying to read it. Also for some features, like CFI, we must skip
1319 // the compilation as CombinedIndex does not contain all required
1320 // information.
1321 EmptyModule = std::make_unique<llvm::Module>("empty", M->getContext());
1322 EmptyModule->setTargetTriple(M->getTargetTriple());
1323 M = EmptyModule.get();
1324 }
1325 }
1326
1327 EmitAssemblyHelper AsmHelper(Diags, HeaderOpts, CGOpts, TOpts, LOpts, M, VFS);
1328 AsmHelper.EmitAssembly(Action, std::move(OS), BC);
1329
1330 // Verify clang's TargetInfo DataLayout against the LLVM TargetMachine's
1331 // DataLayout.
1332 if (AsmHelper.TM) {
1333 std::string DLDesc = M->getDataLayout().getStringRepresentation();
1334 if (DLDesc != TDesc) {
1335 unsigned DiagID = Diags.getCustomDiagID(
1336 DiagnosticsEngine::Error, "backend data layout '%0' does not match "
1337 "expected target description '%1'");
1338 Diags.Report(DiagID) << DLDesc << TDesc;
1339 }
1340 }
1341 }
1342
1343 // With -fembed-bitcode, save a copy of the llvm IR as data in the
1344 // __LLVM,__bitcode section.
EmbedBitcode(llvm::Module * M,const CodeGenOptions & CGOpts,llvm::MemoryBufferRef Buf)1345 void clang::EmbedBitcode(llvm::Module *M, const CodeGenOptions &CGOpts,
1346 llvm::MemoryBufferRef Buf) {
1347 if (CGOpts.getEmbedBitcode() == CodeGenOptions::Embed_Off)
1348 return;
1349 llvm::embedBitcodeInModule(
1350 *M, Buf, CGOpts.getEmbedBitcode() != CodeGenOptions::Embed_Marker,
1351 CGOpts.getEmbedBitcode() != CodeGenOptions::Embed_Bitcode,
1352 CGOpts.CmdArgs);
1353 }
1354
EmbedObject(llvm::Module * M,const CodeGenOptions & CGOpts,DiagnosticsEngine & Diags)1355 void clang::EmbedObject(llvm::Module *M, const CodeGenOptions &CGOpts,
1356 DiagnosticsEngine &Diags) {
1357 if (CGOpts.OffloadObjects.empty())
1358 return;
1359
1360 for (StringRef OffloadObject : CGOpts.OffloadObjects) {
1361 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ObjectOrErr =
1362 llvm::MemoryBuffer::getFileOrSTDIN(OffloadObject);
1363 if (ObjectOrErr.getError()) {
1364 auto DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
1365 "could not open '%0' for embedding");
1366 Diags.Report(DiagID) << OffloadObject;
1367 return;
1368 }
1369
1370 llvm::embedBufferInModule(*M, **ObjectOrErr, ".llvm.offloading",
1371 Align(object::OffloadBinary::getAlignment()));
1372 }
1373 }
1374