CodeGenAction.cpp revision 302408
1//===--- CodeGenAction.cpp - LLVM Code Generation Frontend Action ---------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#include "CoverageMappingGen.h" 11#include "clang/AST/ASTConsumer.h" 12#include "clang/AST/ASTContext.h" 13#include "clang/AST/DeclCXX.h" 14#include "clang/AST/DeclGroup.h" 15#include "clang/Basic/FileManager.h" 16#include "clang/Basic/SourceManager.h" 17#include "clang/Basic/TargetInfo.h" 18#include "clang/CodeGen/BackendUtil.h" 19#include "clang/CodeGen/CodeGenAction.h" 20#include "clang/CodeGen/ModuleBuilder.h" 21#include "clang/Frontend/CompilerInstance.h" 22#include "clang/Frontend/FrontendDiagnostic.h" 23#include "clang/Lex/Preprocessor.h" 24#include "llvm/ADT/SmallString.h" 25#include "llvm/Bitcode/ReaderWriter.h" 26#include "llvm/IR/DebugInfo.h" 27#include "llvm/IR/DiagnosticInfo.h" 28#include "llvm/IR/DiagnosticPrinter.h" 29#include "llvm/IR/LLVMContext.h" 30#include "llvm/IR/Module.h" 31#include "llvm/IRReader/IRReader.h" 32#include "llvm/Linker/Linker.h" 33#include "llvm/Pass.h" 34#include "llvm/Support/MemoryBuffer.h" 35#include "llvm/Support/SourceMgr.h" 36#include "llvm/Support/Timer.h" 37#include <memory> 38using namespace clang; 39using namespace llvm; 40 41namespace clang { 42 class BackendConsumer : public ASTConsumer { 43 virtual void anchor(); 44 DiagnosticsEngine &Diags; 45 BackendAction Action; 46 const CodeGenOptions &CodeGenOpts; 47 const TargetOptions &TargetOpts; 48 const LangOptions &LangOpts; 49 raw_pwrite_stream *AsmOutStream; 50 ASTContext *Context; 51 52 Timer LLVMIRGeneration; 53 54 std::unique_ptr<CodeGenerator> Gen; 55 56 std::unique_ptr<llvm::Module> TheModule; 57 SmallVector<std::pair<unsigned, std::unique_ptr<llvm::Module>>, 4> 58 LinkModules; 59 60 // This is here so that the diagnostic printer knows the module a diagnostic 61 // refers to. 62 llvm::Module *CurLinkModule = nullptr; 63 64 public: 65 BackendConsumer( 66 BackendAction Action, DiagnosticsEngine &Diags, 67 const HeaderSearchOptions &HeaderSearchOpts, 68 const PreprocessorOptions &PPOpts, const CodeGenOptions &CodeGenOpts, 69 const TargetOptions &TargetOpts, const LangOptions &LangOpts, 70 bool TimePasses, const std::string &InFile, 71 const SmallVectorImpl<std::pair<unsigned, llvm::Module *>> &LinkModules, 72 raw_pwrite_stream *OS, LLVMContext &C, 73 CoverageSourceInfo *CoverageInfo = nullptr) 74 : Diags(Diags), Action(Action), CodeGenOpts(CodeGenOpts), 75 TargetOpts(TargetOpts), LangOpts(LangOpts), AsmOutStream(OS), 76 Context(nullptr), LLVMIRGeneration("LLVM IR Generation Time"), 77 Gen(CreateLLVMCodeGen(Diags, InFile, HeaderSearchOpts, PPOpts, 78 CodeGenOpts, C, CoverageInfo)) { 79 llvm::TimePassesIsEnabled = TimePasses; 80 for (auto &I : LinkModules) 81 this->LinkModules.push_back( 82 std::make_pair(I.first, std::unique_ptr<llvm::Module>(I.second))); 83 } 84 std::unique_ptr<llvm::Module> takeModule() { return std::move(TheModule); } 85 void releaseLinkModules() { 86 for (auto &I : LinkModules) 87 I.second.release(); 88 } 89 90 void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) override { 91 Gen->HandleCXXStaticMemberVarInstantiation(VD); 92 } 93 94 void Initialize(ASTContext &Ctx) override { 95 assert(!Context && "initialized multiple times"); 96 97 Context = &Ctx; 98 99 if (llvm::TimePassesIsEnabled) 100 LLVMIRGeneration.startTimer(); 101 102 Gen->Initialize(Ctx); 103 104 TheModule.reset(Gen->GetModule()); 105 106 if (llvm::TimePassesIsEnabled) 107 LLVMIRGeneration.stopTimer(); 108 } 109 110 bool HandleTopLevelDecl(DeclGroupRef D) override { 111 PrettyStackTraceDecl CrashInfo(*D.begin(), SourceLocation(), 112 Context->getSourceManager(), 113 "LLVM IR generation of declaration"); 114 115 if (llvm::TimePassesIsEnabled) 116 LLVMIRGeneration.startTimer(); 117 118 Gen->HandleTopLevelDecl(D); 119 120 if (llvm::TimePassesIsEnabled) 121 LLVMIRGeneration.stopTimer(); 122 123 return true; 124 } 125 126 void HandleInlineMethodDefinition(CXXMethodDecl *D) override { 127 PrettyStackTraceDecl CrashInfo(D, SourceLocation(), 128 Context->getSourceManager(), 129 "LLVM IR generation of inline method"); 130 if (llvm::TimePassesIsEnabled) 131 LLVMIRGeneration.startTimer(); 132 133 Gen->HandleInlineMethodDefinition(D); 134 135 if (llvm::TimePassesIsEnabled) 136 LLVMIRGeneration.stopTimer(); 137 } 138 139 void HandleTranslationUnit(ASTContext &C) override { 140 { 141 PrettyStackTraceString CrashInfo("Per-file LLVM IR generation"); 142 if (llvm::TimePassesIsEnabled) 143 LLVMIRGeneration.startTimer(); 144 145 Gen->HandleTranslationUnit(C); 146 147 if (llvm::TimePassesIsEnabled) 148 LLVMIRGeneration.stopTimer(); 149 } 150 151 // Silently ignore if we weren't initialized for some reason. 152 if (!TheModule) 153 return; 154 155 // Make sure IR generation is happy with the module. This is released by 156 // the module provider. 157 llvm::Module *M = Gen->ReleaseModule(); 158 if (!M) { 159 // The module has been released by IR gen on failures, do not double 160 // free. 161 TheModule.release(); 162 return; 163 } 164 165 assert(TheModule.get() == M && 166 "Unexpected module change during IR generation"); 167 168 // Install an inline asm handler so that diagnostics get printed through 169 // our diagnostics hooks. 170 LLVMContext &Ctx = TheModule->getContext(); 171 LLVMContext::InlineAsmDiagHandlerTy OldHandler = 172 Ctx.getInlineAsmDiagnosticHandler(); 173 void *OldContext = Ctx.getInlineAsmDiagnosticContext(); 174 Ctx.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, this); 175 176 LLVMContext::DiagnosticHandlerTy OldDiagnosticHandler = 177 Ctx.getDiagnosticHandler(); 178 void *OldDiagnosticContext = Ctx.getDiagnosticContext(); 179 Ctx.setDiagnosticHandler(DiagnosticHandler, this); 180 181 // Link LinkModule into this module if present, preserving its validity. 182 for (auto &I : LinkModules) { 183 unsigned LinkFlags = I.first; 184 CurLinkModule = I.second.get(); 185 if (Linker::linkModules(*M, std::move(I.second), LinkFlags)) 186 return; 187 } 188 189 EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts, 190 C.getTargetInfo().getDataLayoutString(), 191 TheModule.get(), Action, AsmOutStream); 192 193 Ctx.setInlineAsmDiagnosticHandler(OldHandler, OldContext); 194 195 Ctx.setDiagnosticHandler(OldDiagnosticHandler, OldDiagnosticContext); 196 } 197 198 void HandleTagDeclDefinition(TagDecl *D) override { 199 PrettyStackTraceDecl CrashInfo(D, SourceLocation(), 200 Context->getSourceManager(), 201 "LLVM IR generation of declaration"); 202 Gen->HandleTagDeclDefinition(D); 203 } 204 205 void HandleTagDeclRequiredDefinition(const TagDecl *D) override { 206 Gen->HandleTagDeclRequiredDefinition(D); 207 } 208 209 void CompleteTentativeDefinition(VarDecl *D) override { 210 Gen->CompleteTentativeDefinition(D); 211 } 212 213 void HandleVTable(CXXRecordDecl *RD) override { 214 Gen->HandleVTable(RD); 215 } 216 217 void HandleLinkerOptionPragma(llvm::StringRef Opts) override { 218 Gen->HandleLinkerOptionPragma(Opts); 219 } 220 221 void HandleDetectMismatch(llvm::StringRef Name, 222 llvm::StringRef Value) override { 223 Gen->HandleDetectMismatch(Name, Value); 224 } 225 226 void HandleDependentLibrary(llvm::StringRef Opts) override { 227 Gen->HandleDependentLibrary(Opts); 228 } 229 230 static void InlineAsmDiagHandler(const llvm::SMDiagnostic &SM,void *Context, 231 unsigned LocCookie) { 232 SourceLocation Loc = SourceLocation::getFromRawEncoding(LocCookie); 233 ((BackendConsumer*)Context)->InlineAsmDiagHandler2(SM, Loc); 234 } 235 236 static void DiagnosticHandler(const llvm::DiagnosticInfo &DI, 237 void *Context) { 238 ((BackendConsumer *)Context)->DiagnosticHandlerImpl(DI); 239 } 240 241 void InlineAsmDiagHandler2(const llvm::SMDiagnostic &, 242 SourceLocation LocCookie); 243 244 void DiagnosticHandlerImpl(const llvm::DiagnosticInfo &DI); 245 /// \brief Specialized handler for InlineAsm diagnostic. 246 /// \return True if the diagnostic has been successfully reported, false 247 /// otherwise. 248 bool InlineAsmDiagHandler(const llvm::DiagnosticInfoInlineAsm &D); 249 /// \brief Specialized handler for StackSize diagnostic. 250 /// \return True if the diagnostic has been successfully reported, false 251 /// otherwise. 252 bool StackSizeDiagHandler(const llvm::DiagnosticInfoStackSize &D); 253 /// \brief Specialized handlers for optimization remarks. 254 /// Note that these handlers only accept remarks and they always handle 255 /// them. 256 void EmitOptimizationMessage(const llvm::DiagnosticInfoOptimizationBase &D, 257 unsigned DiagID); 258 void 259 OptimizationRemarkHandler(const llvm::DiagnosticInfoOptimizationRemark &D); 260 void OptimizationRemarkHandler( 261 const llvm::DiagnosticInfoOptimizationRemarkMissed &D); 262 void OptimizationRemarkHandler( 263 const llvm::DiagnosticInfoOptimizationRemarkAnalysis &D); 264 void OptimizationRemarkHandler( 265 const llvm::DiagnosticInfoOptimizationRemarkAnalysisFPCommute &D); 266 void OptimizationRemarkHandler( 267 const llvm::DiagnosticInfoOptimizationRemarkAnalysisAliasing &D); 268 void OptimizationFailureHandler( 269 const llvm::DiagnosticInfoOptimizationFailure &D); 270 }; 271 272 void BackendConsumer::anchor() {} 273} 274 275/// ConvertBackendLocation - Convert a location in a temporary llvm::SourceMgr 276/// buffer to be a valid FullSourceLoc. 277static FullSourceLoc ConvertBackendLocation(const llvm::SMDiagnostic &D, 278 SourceManager &CSM) { 279 // Get both the clang and llvm source managers. The location is relative to 280 // a memory buffer that the LLVM Source Manager is handling, we need to add 281 // a copy to the Clang source manager. 282 const llvm::SourceMgr &LSM = *D.getSourceMgr(); 283 284 // We need to copy the underlying LLVM memory buffer because llvm::SourceMgr 285 // already owns its one and clang::SourceManager wants to own its one. 286 const MemoryBuffer *LBuf = 287 LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc())); 288 289 // Create the copy and transfer ownership to clang::SourceManager. 290 // TODO: Avoid copying files into memory. 291 std::unique_ptr<llvm::MemoryBuffer> CBuf = 292 llvm::MemoryBuffer::getMemBufferCopy(LBuf->getBuffer(), 293 LBuf->getBufferIdentifier()); 294 // FIXME: Keep a file ID map instead of creating new IDs for each location. 295 FileID FID = CSM.createFileID(std::move(CBuf)); 296 297 // Translate the offset into the file. 298 unsigned Offset = D.getLoc().getPointer() - LBuf->getBufferStart(); 299 SourceLocation NewLoc = 300 CSM.getLocForStartOfFile(FID).getLocWithOffset(Offset); 301 return FullSourceLoc(NewLoc, CSM); 302} 303 304 305/// InlineAsmDiagHandler2 - This function is invoked when the backend hits an 306/// error parsing inline asm. The SMDiagnostic indicates the error relative to 307/// the temporary memory buffer that the inline asm parser has set up. 308void BackendConsumer::InlineAsmDiagHandler2(const llvm::SMDiagnostic &D, 309 SourceLocation LocCookie) { 310 // There are a couple of different kinds of errors we could get here. First, 311 // we re-format the SMDiagnostic in terms of a clang diagnostic. 312 313 // Strip "error: " off the start of the message string. 314 StringRef Message = D.getMessage(); 315 if (Message.startswith("error: ")) 316 Message = Message.substr(7); 317 318 // If the SMDiagnostic has an inline asm source location, translate it. 319 FullSourceLoc Loc; 320 if (D.getLoc() != SMLoc()) 321 Loc = ConvertBackendLocation(D, Context->getSourceManager()); 322 323 unsigned DiagID; 324 switch (D.getKind()) { 325 case llvm::SourceMgr::DK_Error: 326 DiagID = diag::err_fe_inline_asm; 327 break; 328 case llvm::SourceMgr::DK_Warning: 329 DiagID = diag::warn_fe_inline_asm; 330 break; 331 case llvm::SourceMgr::DK_Note: 332 DiagID = diag::note_fe_inline_asm; 333 break; 334 } 335 // If this problem has clang-level source location information, report the 336 // issue in the source with a note showing the instantiated 337 // code. 338 if (LocCookie.isValid()) { 339 Diags.Report(LocCookie, DiagID).AddString(Message); 340 341 if (D.getLoc().isValid()) { 342 DiagnosticBuilder B = Diags.Report(Loc, diag::note_fe_inline_asm_here); 343 // Convert the SMDiagnostic ranges into SourceRange and attach them 344 // to the diagnostic. 345 for (const std::pair<unsigned, unsigned> &Range : D.getRanges()) { 346 unsigned Column = D.getColumnNo(); 347 B << SourceRange(Loc.getLocWithOffset(Range.first - Column), 348 Loc.getLocWithOffset(Range.second - Column)); 349 } 350 } 351 return; 352 } 353 354 // Otherwise, report the backend issue as occurring in the generated .s file. 355 // If Loc is invalid, we still need to report the issue, it just gets no 356 // location info. 357 Diags.Report(Loc, DiagID).AddString(Message); 358} 359 360#define ComputeDiagID(Severity, GroupName, DiagID) \ 361 do { \ 362 switch (Severity) { \ 363 case llvm::DS_Error: \ 364 DiagID = diag::err_fe_##GroupName; \ 365 break; \ 366 case llvm::DS_Warning: \ 367 DiagID = diag::warn_fe_##GroupName; \ 368 break; \ 369 case llvm::DS_Remark: \ 370 llvm_unreachable("'remark' severity not expected"); \ 371 break; \ 372 case llvm::DS_Note: \ 373 DiagID = diag::note_fe_##GroupName; \ 374 break; \ 375 } \ 376 } while (false) 377 378#define ComputeDiagRemarkID(Severity, GroupName, DiagID) \ 379 do { \ 380 switch (Severity) { \ 381 case llvm::DS_Error: \ 382 DiagID = diag::err_fe_##GroupName; \ 383 break; \ 384 case llvm::DS_Warning: \ 385 DiagID = diag::warn_fe_##GroupName; \ 386 break; \ 387 case llvm::DS_Remark: \ 388 DiagID = diag::remark_fe_##GroupName; \ 389 break; \ 390 case llvm::DS_Note: \ 391 DiagID = diag::note_fe_##GroupName; \ 392 break; \ 393 } \ 394 } while (false) 395 396bool 397BackendConsumer::InlineAsmDiagHandler(const llvm::DiagnosticInfoInlineAsm &D) { 398 unsigned DiagID; 399 ComputeDiagID(D.getSeverity(), inline_asm, DiagID); 400 std::string Message = D.getMsgStr().str(); 401 402 // If this problem has clang-level source location information, report the 403 // issue as being a problem in the source with a note showing the instantiated 404 // code. 405 SourceLocation LocCookie = 406 SourceLocation::getFromRawEncoding(D.getLocCookie()); 407 if (LocCookie.isValid()) 408 Diags.Report(LocCookie, DiagID).AddString(Message); 409 else { 410 // Otherwise, report the backend diagnostic as occurring in the generated 411 // .s file. 412 // If Loc is invalid, we still need to report the diagnostic, it just gets 413 // no location info. 414 FullSourceLoc Loc; 415 Diags.Report(Loc, DiagID).AddString(Message); 416 } 417 // We handled all the possible severities. 418 return true; 419} 420 421bool 422BackendConsumer::StackSizeDiagHandler(const llvm::DiagnosticInfoStackSize &D) { 423 if (D.getSeverity() != llvm::DS_Warning) 424 // For now, the only support we have for StackSize diagnostic is warning. 425 // We do not know how to format other severities. 426 return false; 427 428 if (const Decl *ND = Gen->GetDeclForMangledName(D.getFunction().getName())) { 429 Diags.Report(ND->getASTContext().getFullLoc(ND->getLocation()), 430 diag::warn_fe_frame_larger_than) 431 << D.getStackSize() << Decl::castToDeclContext(ND); 432 return true; 433 } 434 435 return false; 436} 437 438void BackendConsumer::EmitOptimizationMessage( 439 const llvm::DiagnosticInfoOptimizationBase &D, unsigned DiagID) { 440 // We only support warnings and remarks. 441 assert(D.getSeverity() == llvm::DS_Remark || 442 D.getSeverity() == llvm::DS_Warning); 443 444 SourceManager &SourceMgr = Context->getSourceManager(); 445 FileManager &FileMgr = SourceMgr.getFileManager(); 446 StringRef Filename; 447 unsigned Line, Column; 448 SourceLocation DILoc; 449 450 if (D.isLocationAvailable()) { 451 D.getLocation(&Filename, &Line, &Column); 452 const FileEntry *FE = FileMgr.getFile(Filename); 453 if (FE && Line > 0) { 454 // If -gcolumn-info was not used, Column will be 0. This upsets the 455 // source manager, so pass 1 if Column is not set. 456 DILoc = SourceMgr.translateFileLineCol(FE, Line, Column ? Column : 1); 457 } 458 } 459 460 // If a location isn't available, try to approximate it using the associated 461 // function definition. We use the definition's right brace to differentiate 462 // from diagnostics that genuinely relate to the function itself. 463 FullSourceLoc Loc(DILoc, SourceMgr); 464 if (Loc.isInvalid()) 465 if (const Decl *FD = Gen->GetDeclForMangledName(D.getFunction().getName())) 466 Loc = FD->getASTContext().getFullLoc(FD->getBodyRBrace()); 467 468 Diags.Report(Loc, DiagID) 469 << AddFlagValue(D.getPassName() ? D.getPassName() : "") 470 << D.getMsg().str(); 471 472 if (DILoc.isInvalid() && D.isLocationAvailable()) 473 // If we were not able to translate the file:line:col information 474 // back to a SourceLocation, at least emit a note stating that 475 // we could not translate this location. This can happen in the 476 // case of #line directives. 477 Diags.Report(Loc, diag::note_fe_backend_optimization_remark_invalid_loc) 478 << Filename << Line << Column; 479} 480 481void BackendConsumer::OptimizationRemarkHandler( 482 const llvm::DiagnosticInfoOptimizationRemark &D) { 483 // Optimization remarks are active only if the -Rpass flag has a regular 484 // expression that matches the name of the pass name in \p D. 485 if (CodeGenOpts.OptimizationRemarkPattern && 486 CodeGenOpts.OptimizationRemarkPattern->match(D.getPassName())) 487 EmitOptimizationMessage(D, diag::remark_fe_backend_optimization_remark); 488} 489 490void BackendConsumer::OptimizationRemarkHandler( 491 const llvm::DiagnosticInfoOptimizationRemarkMissed &D) { 492 // Missed optimization remarks are active only if the -Rpass-missed 493 // flag has a regular expression that matches the name of the pass 494 // name in \p D. 495 if (CodeGenOpts.OptimizationRemarkMissedPattern && 496 CodeGenOpts.OptimizationRemarkMissedPattern->match(D.getPassName())) 497 EmitOptimizationMessage(D, 498 diag::remark_fe_backend_optimization_remark_missed); 499} 500 501void BackendConsumer::OptimizationRemarkHandler( 502 const llvm::DiagnosticInfoOptimizationRemarkAnalysis &D) { 503 // Optimization analysis remarks are active if the pass name is set to 504 // llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a 505 // regular expression that matches the name of the pass name in \p D. 506 507 if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint || 508 (CodeGenOpts.OptimizationRemarkAnalysisPattern && 509 CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName()))) 510 EmitOptimizationMessage( 511 D, diag::remark_fe_backend_optimization_remark_analysis); 512} 513 514void BackendConsumer::OptimizationRemarkHandler( 515 const llvm::DiagnosticInfoOptimizationRemarkAnalysisFPCommute &D) { 516 // Optimization analysis remarks are active if the pass name is set to 517 // llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a 518 // regular expression that matches the name of the pass name in \p D. 519 520 if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint || 521 (CodeGenOpts.OptimizationRemarkAnalysisPattern && 522 CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName()))) 523 EmitOptimizationMessage( 524 D, diag::remark_fe_backend_optimization_remark_analysis_fpcommute); 525} 526 527void BackendConsumer::OptimizationRemarkHandler( 528 const llvm::DiagnosticInfoOptimizationRemarkAnalysisAliasing &D) { 529 // Optimization analysis remarks are active if the pass name is set to 530 // llvm::DiagnosticInfo::AlwasyPrint or if the -Rpass-analysis flag has a 531 // regular expression that matches the name of the pass name in \p D. 532 533 if (D.getPassName() == llvm::DiagnosticInfo::AlwaysPrint || 534 (CodeGenOpts.OptimizationRemarkAnalysisPattern && 535 CodeGenOpts.OptimizationRemarkAnalysisPattern->match(D.getPassName()))) 536 EmitOptimizationMessage( 537 D, diag::remark_fe_backend_optimization_remark_analysis_aliasing); 538} 539 540void BackendConsumer::OptimizationFailureHandler( 541 const llvm::DiagnosticInfoOptimizationFailure &D) { 542 EmitOptimizationMessage(D, diag::warn_fe_backend_optimization_failure); 543} 544 545/// \brief This function is invoked when the backend needs 546/// to report something to the user. 547void BackendConsumer::DiagnosticHandlerImpl(const DiagnosticInfo &DI) { 548 unsigned DiagID = diag::err_fe_inline_asm; 549 llvm::DiagnosticSeverity Severity = DI.getSeverity(); 550 // Get the diagnostic ID based. 551 switch (DI.getKind()) { 552 case llvm::DK_InlineAsm: 553 if (InlineAsmDiagHandler(cast<DiagnosticInfoInlineAsm>(DI))) 554 return; 555 ComputeDiagID(Severity, inline_asm, DiagID); 556 break; 557 case llvm::DK_StackSize: 558 if (StackSizeDiagHandler(cast<DiagnosticInfoStackSize>(DI))) 559 return; 560 ComputeDiagID(Severity, backend_frame_larger_than, DiagID); 561 break; 562 case DK_Linker: 563 assert(CurLinkModule); 564 // FIXME: stop eating the warnings and notes. 565 if (Severity != DS_Error) 566 return; 567 DiagID = diag::err_fe_cannot_link_module; 568 break; 569 case llvm::DK_OptimizationRemark: 570 // Optimization remarks are always handled completely by this 571 // handler. There is no generic way of emitting them. 572 OptimizationRemarkHandler(cast<DiagnosticInfoOptimizationRemark>(DI)); 573 return; 574 case llvm::DK_OptimizationRemarkMissed: 575 // Optimization remarks are always handled completely by this 576 // handler. There is no generic way of emitting them. 577 OptimizationRemarkHandler(cast<DiagnosticInfoOptimizationRemarkMissed>(DI)); 578 return; 579 case llvm::DK_OptimizationRemarkAnalysis: 580 // Optimization remarks are always handled completely by this 581 // handler. There is no generic way of emitting them. 582 OptimizationRemarkHandler( 583 cast<DiagnosticInfoOptimizationRemarkAnalysis>(DI)); 584 return; 585 case llvm::DK_OptimizationRemarkAnalysisFPCommute: 586 // Optimization remarks are always handled completely by this 587 // handler. There is no generic way of emitting them. 588 OptimizationRemarkHandler( 589 cast<DiagnosticInfoOptimizationRemarkAnalysisFPCommute>(DI)); 590 return; 591 case llvm::DK_OptimizationRemarkAnalysisAliasing: 592 // Optimization remarks are always handled completely by this 593 // handler. There is no generic way of emitting them. 594 OptimizationRemarkHandler( 595 cast<DiagnosticInfoOptimizationRemarkAnalysisAliasing>(DI)); 596 return; 597 case llvm::DK_OptimizationFailure: 598 // Optimization failures are always handled completely by this 599 // handler. 600 OptimizationFailureHandler(cast<DiagnosticInfoOptimizationFailure>(DI)); 601 return; 602 default: 603 // Plugin IDs are not bound to any value as they are set dynamically. 604 ComputeDiagRemarkID(Severity, backend_plugin, DiagID); 605 break; 606 } 607 std::string MsgStorage; 608 { 609 raw_string_ostream Stream(MsgStorage); 610 DiagnosticPrinterRawOStream DP(Stream); 611 DI.print(DP); 612 } 613 614 if (DiagID == diag::err_fe_cannot_link_module) { 615 Diags.Report(diag::err_fe_cannot_link_module) 616 << CurLinkModule->getModuleIdentifier() << MsgStorage; 617 return; 618 } 619 620 // Report the backend message using the usual diagnostic mechanism. 621 FullSourceLoc Loc; 622 Diags.Report(Loc, DiagID).AddString(MsgStorage); 623} 624#undef ComputeDiagID 625 626CodeGenAction::CodeGenAction(unsigned _Act, LLVMContext *_VMContext) 627 : Act(_Act), VMContext(_VMContext ? _VMContext : new LLVMContext), 628 OwnsVMContext(!_VMContext) {} 629 630CodeGenAction::~CodeGenAction() { 631 TheModule.reset(); 632 if (OwnsVMContext) 633 delete VMContext; 634} 635 636bool CodeGenAction::hasIRSupport() const { return true; } 637 638void CodeGenAction::EndSourceFileAction() { 639 // If the consumer creation failed, do nothing. 640 if (!getCompilerInstance().hasASTConsumer()) 641 return; 642 643 // Take back ownership of link modules we passed to consumer. 644 if (!LinkModules.empty()) 645 BEConsumer->releaseLinkModules(); 646 647 // Steal the module from the consumer. 648 TheModule = BEConsumer->takeModule(); 649} 650 651std::unique_ptr<llvm::Module> CodeGenAction::takeModule() { 652 return std::move(TheModule); 653} 654 655llvm::LLVMContext *CodeGenAction::takeLLVMContext() { 656 OwnsVMContext = false; 657 return VMContext; 658} 659 660static raw_pwrite_stream * 661GetOutputStream(CompilerInstance &CI, StringRef InFile, BackendAction Action) { 662 switch (Action) { 663 case Backend_EmitAssembly: 664 return CI.createDefaultOutputFile(false, InFile, "s"); 665 case Backend_EmitLL: 666 return CI.createDefaultOutputFile(false, InFile, "ll"); 667 case Backend_EmitBC: 668 return CI.createDefaultOutputFile(true, InFile, "bc"); 669 case Backend_EmitNothing: 670 return nullptr; 671 case Backend_EmitMCNull: 672 return CI.createNullOutputFile(); 673 case Backend_EmitObj: 674 return CI.createDefaultOutputFile(true, InFile, "o"); 675 } 676 677 llvm_unreachable("Invalid action!"); 678} 679 680std::unique_ptr<ASTConsumer> 681CodeGenAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) { 682 BackendAction BA = static_cast<BackendAction>(Act); 683 raw_pwrite_stream *OS = GetOutputStream(CI, InFile, BA); 684 if (BA != Backend_EmitNothing && !OS) 685 return nullptr; 686 687 // Load bitcode modules to link with, if we need to. 688 if (LinkModules.empty()) 689 for (auto &I : CI.getCodeGenOpts().LinkBitcodeFiles) { 690 const std::string &LinkBCFile = I.second; 691 692 auto BCBuf = CI.getFileManager().getBufferForFile(LinkBCFile); 693 if (!BCBuf) { 694 CI.getDiagnostics().Report(diag::err_cannot_open_file) 695 << LinkBCFile << BCBuf.getError().message(); 696 LinkModules.clear(); 697 return nullptr; 698 } 699 700 ErrorOr<std::unique_ptr<llvm::Module>> ModuleOrErr = 701 getLazyBitcodeModule(std::move(*BCBuf), *VMContext); 702 if (std::error_code EC = ModuleOrErr.getError()) { 703 CI.getDiagnostics().Report(diag::err_cannot_open_file) << LinkBCFile 704 << EC.message(); 705 LinkModules.clear(); 706 return nullptr; 707 } 708 addLinkModule(ModuleOrErr.get().release(), I.first); 709 } 710 711 CoverageSourceInfo *CoverageInfo = nullptr; 712 // Add the preprocessor callback only when the coverage mapping is generated. 713 if (CI.getCodeGenOpts().CoverageMapping) { 714 CoverageInfo = new CoverageSourceInfo; 715 CI.getPreprocessor().addPPCallbacks( 716 std::unique_ptr<PPCallbacks>(CoverageInfo)); 717 } 718 719 std::unique_ptr<BackendConsumer> Result(new BackendConsumer( 720 BA, CI.getDiagnostics(), CI.getHeaderSearchOpts(), 721 CI.getPreprocessorOpts(), CI.getCodeGenOpts(), CI.getTargetOpts(), 722 CI.getLangOpts(), CI.getFrontendOpts().ShowTimers, InFile, LinkModules, 723 OS, *VMContext, CoverageInfo)); 724 BEConsumer = Result.get(); 725 return std::move(Result); 726} 727 728static void BitcodeInlineAsmDiagHandler(const llvm::SMDiagnostic &SM, 729 void *Context, 730 unsigned LocCookie) { 731 SM.print(nullptr, llvm::errs()); 732} 733 734void CodeGenAction::ExecuteAction() { 735 // If this is an IR file, we have to treat it specially. 736 if (getCurrentFileKind() == IK_LLVM_IR) { 737 BackendAction BA = static_cast<BackendAction>(Act); 738 CompilerInstance &CI = getCompilerInstance(); 739 raw_pwrite_stream *OS = GetOutputStream(CI, getCurrentFile(), BA); 740 if (BA != Backend_EmitNothing && !OS) 741 return; 742 743 bool Invalid; 744 SourceManager &SM = CI.getSourceManager(); 745 FileID FID = SM.getMainFileID(); 746 llvm::MemoryBuffer *MainFile = SM.getBuffer(FID, &Invalid); 747 if (Invalid) 748 return; 749 750 llvm::SMDiagnostic Err; 751 TheModule = parseIR(MainFile->getMemBufferRef(), Err, *VMContext); 752 if (!TheModule) { 753 // Translate from the diagnostic info to the SourceManager location if 754 // available. 755 // TODO: Unify this with ConvertBackendLocation() 756 SourceLocation Loc; 757 if (Err.getLineNo() > 0) { 758 assert(Err.getColumnNo() >= 0); 759 Loc = SM.translateFileLineCol(SM.getFileEntryForID(FID), 760 Err.getLineNo(), Err.getColumnNo() + 1); 761 } 762 763 // Strip off a leading diagnostic code if there is one. 764 StringRef Msg = Err.getMessage(); 765 if (Msg.startswith("error: ")) 766 Msg = Msg.substr(7); 767 768 unsigned DiagID = 769 CI.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Error, "%0"); 770 771 CI.getDiagnostics().Report(Loc, DiagID) << Msg; 772 return; 773 } 774 const TargetOptions &TargetOpts = CI.getTargetOpts(); 775 if (TheModule->getTargetTriple() != TargetOpts.Triple) { 776 CI.getDiagnostics().Report(SourceLocation(), 777 diag::warn_fe_override_module) 778 << TargetOpts.Triple; 779 TheModule->setTargetTriple(TargetOpts.Triple); 780 } 781 782 LLVMContext &Ctx = TheModule->getContext(); 783 Ctx.setInlineAsmDiagnosticHandler(BitcodeInlineAsmDiagHandler); 784 EmitBackendOutput(CI.getDiagnostics(), CI.getCodeGenOpts(), TargetOpts, 785 CI.getLangOpts(), CI.getTarget().getDataLayoutString(), 786 TheModule.get(), BA, OS); 787 return; 788 } 789 790 // Otherwise follow the normal AST path. 791 this->ASTFrontendAction::ExecuteAction(); 792} 793 794// 795 796void EmitAssemblyAction::anchor() { } 797EmitAssemblyAction::EmitAssemblyAction(llvm::LLVMContext *_VMContext) 798 : CodeGenAction(Backend_EmitAssembly, _VMContext) {} 799 800void EmitBCAction::anchor() { } 801EmitBCAction::EmitBCAction(llvm::LLVMContext *_VMContext) 802 : CodeGenAction(Backend_EmitBC, _VMContext) {} 803 804void EmitLLVMAction::anchor() { } 805EmitLLVMAction::EmitLLVMAction(llvm::LLVMContext *_VMContext) 806 : CodeGenAction(Backend_EmitLL, _VMContext) {} 807 808void EmitLLVMOnlyAction::anchor() { } 809EmitLLVMOnlyAction::EmitLLVMOnlyAction(llvm::LLVMContext *_VMContext) 810 : CodeGenAction(Backend_EmitNothing, _VMContext) {} 811 812void EmitCodeGenOnlyAction::anchor() { } 813EmitCodeGenOnlyAction::EmitCodeGenOnlyAction(llvm::LLVMContext *_VMContext) 814 : CodeGenAction(Backend_EmitMCNull, _VMContext) {} 815 816void EmitObjAction::anchor() { } 817EmitObjAction::EmitObjAction(llvm::LLVMContext *_VMContext) 818 : CodeGenAction(Backend_EmitObj, _VMContext) {} 819