1 //===--- CodeGenModule.h - Per-Module state for LLVM CodeGen ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This is the internal per-translation-unit state used for llvm translation.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
15 #define LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
17 #include "CGVTables.h"
18 #include "CodeGenTypeCache.h"
19 #include "CodeGenTypes.h"
20 #include "SanitizerMetadata.h"
21 #include "clang/AST/Attr.h"
22 #include "clang/AST/DeclCXX.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/GlobalDecl.h"
26 #include "clang/AST/Mangle.h"
27 #include "clang/Basic/ABI.h"
28 #include "clang/Basic/LangOptions.h"
29 #include "clang/Basic/Module.h"
30 #include "clang/Basic/SanitizerBlacklist.h"
31 #include "clang/Basic/XRayLists.h"
32 #include "llvm/ADT/DenseMap.h"
33 #include "llvm/ADT/SetVector.h"
34 #include "llvm/ADT/SmallPtrSet.h"
35 #include "llvm/ADT/StringMap.h"
36 #include "llvm/IR/Module.h"
37 #include "llvm/IR/ValueHandle.h"
38 #include "llvm/Transforms/Utils/SanitizerStats.h"
49 class IndexedInstrProfReader;
58 class ObjCImplementationDecl;
59 class ObjCCategoryImplDecl;
60 class ObjCProtocolDecl;
74 class HeaderSearchOptions;
75 class PreprocessorOptions;
76 class DiagnosticsEngine;
78 class CXXDestructorDecl;
80 class CoverageSourceInfo;
85 class CodeGenFunction;
90 class CGOpenCLRuntime;
91 class CGOpenMPRuntime;
93 class BlockFieldFlags;
94 class FunctionArgList;
95 class CoverageMappingModuleGen;
96 class TargetCodeGenInfo;
98 enum ForDefinition_t : bool {
99 NotForDefinition = false,
103 struct OrderGlobalInits {
104 unsigned int priority;
105 unsigned int lex_order;
106 OrderGlobalInits(unsigned int p, unsigned int l)
107 : priority(p), lex_order(l) {}
109 bool operator==(const OrderGlobalInits &RHS) const {
110 return priority == RHS.priority && lex_order == RHS.lex_order;
113 bool operator<(const OrderGlobalInits &RHS) const {
114 return std::tie(priority, lex_order) <
115 std::tie(RHS.priority, RHS.lex_order);
119 struct ObjCEntrypoints {
120 ObjCEntrypoints() { memset(this, 0, sizeof(*this)); }
122 /// void objc_autoreleasePoolPop(void*);
123 llvm::Constant *objc_autoreleasePoolPop;
125 /// void *objc_autoreleasePoolPush(void);
126 llvm::Constant *objc_autoreleasePoolPush;
128 /// id objc_autorelease(id);
129 llvm::Constant *objc_autorelease;
131 /// id objc_autoreleaseReturnValue(id);
132 llvm::Constant *objc_autoreleaseReturnValue;
134 /// void objc_copyWeak(id *dest, id *src);
135 llvm::Constant *objc_copyWeak;
137 /// void objc_destroyWeak(id*);
138 llvm::Constant *objc_destroyWeak;
140 /// id objc_initWeak(id*, id);
141 llvm::Constant *objc_initWeak;
143 /// id objc_loadWeak(id*);
144 llvm::Constant *objc_loadWeak;
146 /// id objc_loadWeakRetained(id*);
147 llvm::Constant *objc_loadWeakRetained;
149 /// void objc_moveWeak(id *dest, id *src);
150 llvm::Constant *objc_moveWeak;
152 /// id objc_retain(id);
153 llvm::Constant *objc_retain;
155 /// id objc_retainAutorelease(id);
156 llvm::Constant *objc_retainAutorelease;
158 /// id objc_retainAutoreleaseReturnValue(id);
159 llvm::Constant *objc_retainAutoreleaseReturnValue;
161 /// id objc_retainAutoreleasedReturnValue(id);
162 llvm::Constant *objc_retainAutoreleasedReturnValue;
164 /// id objc_retainBlock(id);
165 llvm::Constant *objc_retainBlock;
167 /// void objc_release(id);
168 llvm::Constant *objc_release;
170 /// void objc_storeStrong(id*, id);
171 llvm::Constant *objc_storeStrong;
173 /// id objc_storeWeak(id*, id);
174 llvm::Constant *objc_storeWeak;
176 /// id objc_unsafeClaimAutoreleasedReturnValue(id);
177 llvm::Constant *objc_unsafeClaimAutoreleasedReturnValue;
179 /// A void(void) inline asm to use to mark that the return value of
180 /// a call will be immediately retain.
181 llvm::InlineAsm *retainAutoreleasedReturnValueMarker;
183 /// void clang.arc.use(...);
184 llvm::Constant *clang_arc_use;
187 /// This class records statistics on instrumentation based profiling.
188 class InstrProfStats {
189 uint32_t VisitedInMainFile;
190 uint32_t MissingInMainFile;
197 : VisitedInMainFile(0), MissingInMainFile(0), Visited(0), Missing(0),
199 /// Record that we've visited a function and whether or not that function was
200 /// in the main source file.
201 void addVisited(bool MainFile) {
206 /// Record that a function we've visited has no profile data.
207 void addMissing(bool MainFile) {
212 /// Record that a function we've visited has mismatched profile data.
213 void addMismatched(bool MainFile) { ++Mismatched; }
214 /// Whether or not the stats we've gathered indicate any potential problems.
215 bool hasDiagnostics() { return Missing || Mismatched; }
216 /// Report potential problems we've found to \c Diags.
217 void reportDiagnostics(DiagnosticsEngine &Diags, StringRef MainFile);
220 /// A pair of helper functions for a __block variable.
221 class BlockByrefHelpers : public llvm::FoldingSetNode {
222 // MSVC requires this type to be complete in order to process this
225 llvm::Constant *CopyHelper;
226 llvm::Constant *DisposeHelper;
228 /// The alignment of the field. This is important because
229 /// different offsets to the field within the byref struct need to
230 /// have different helper functions.
233 BlockByrefHelpers(CharUnits alignment) : Alignment(alignment) {}
234 BlockByrefHelpers(const BlockByrefHelpers &) = default;
235 virtual ~BlockByrefHelpers();
237 void Profile(llvm::FoldingSetNodeID &id) const {
238 id.AddInteger(Alignment.getQuantity());
241 virtual void profileImpl(llvm::FoldingSetNodeID &id) const = 0;
243 virtual bool needsCopy() const { return true; }
244 virtual void emitCopy(CodeGenFunction &CGF, Address dest, Address src) = 0;
246 virtual bool needsDispose() const { return true; }
247 virtual void emitDispose(CodeGenFunction &CGF, Address field) = 0;
250 /// This class organizes the cross-function state that is used while generating
252 class CodeGenModule : public CodeGenTypeCache {
253 CodeGenModule(const CodeGenModule &) = delete;
254 void operator=(const CodeGenModule &) = delete;
258 Structor() : Priority(0), Initializer(nullptr), AssociatedData(nullptr) {}
259 Structor(int Priority, llvm::Constant *Initializer,
260 llvm::Constant *AssociatedData)
261 : Priority(Priority), Initializer(Initializer),
262 AssociatedData(AssociatedData) {}
264 llvm::Constant *Initializer;
265 llvm::Constant *AssociatedData;
268 typedef std::vector<Structor> CtorList;
272 const LangOptions &LangOpts;
273 const HeaderSearchOptions &HeaderSearchOpts; // Only used for debug info.
274 const PreprocessorOptions &PreprocessorOpts; // Only used for debug info.
275 const CodeGenOptions &CodeGenOpts;
276 llvm::Module &TheModule;
277 DiagnosticsEngine &Diags;
278 const TargetInfo &Target;
279 std::unique_ptr<CGCXXABI> ABI;
280 llvm::LLVMContext &VMContext;
282 std::unique_ptr<CodeGenTBAA> TBAA;
284 mutable std::unique_ptr<TargetCodeGenInfo> TheTargetCodeGenInfo;
286 // This should not be moved earlier, since its initialization depends on some
287 // of the previous reference members being already initialized and also checks
288 // if TheTargetCodeGenInfo is NULL
291 /// Holds information about C++ vtables.
292 CodeGenVTables VTables;
294 std::unique_ptr<CGObjCRuntime> ObjCRuntime;
295 std::unique_ptr<CGOpenCLRuntime> OpenCLRuntime;
296 std::unique_ptr<CGOpenMPRuntime> OpenMPRuntime;
297 std::unique_ptr<CGCUDARuntime> CUDARuntime;
298 std::unique_ptr<CGDebugInfo> DebugInfo;
299 std::unique_ptr<ObjCEntrypoints> ObjCData;
300 llvm::MDNode *NoObjCARCExceptionsMetadata = nullptr;
301 std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader;
302 InstrProfStats PGOStats;
303 std::unique_ptr<llvm::SanitizerStatReport> SanStats;
305 // A set of references that have only been seen via a weakref so far. This is
306 // used to remove the weak of the reference if we ever see a direct reference
308 llvm::SmallPtrSet<llvm::GlobalValue*, 10> WeakRefReferences;
310 /// This contains all the decls which have definitions but/ which are deferred
311 /// for emission and therefore should only be output if they are actually
312 /// used. If a decl is in this, then it is known to have not been referenced
314 std::map<StringRef, GlobalDecl> DeferredDecls;
316 /// This is a list of deferred decls which we have seen that *are* actually
317 /// referenced. These get code generated when the module is done.
318 struct DeferredGlobal {
319 DeferredGlobal(llvm::GlobalValue *GV, GlobalDecl GD) : GV(GV), GD(GD) {}
320 llvm::TrackingVH<llvm::GlobalValue> GV;
323 std::vector<DeferredGlobal> DeferredDeclsToEmit;
324 void addDeferredDeclToEmit(llvm::GlobalValue *GV, GlobalDecl GD) {
325 DeferredDeclsToEmit.emplace_back(GV, GD);
328 /// List of alias we have emitted. Used to make sure that what they point to
329 /// is defined once we get to the end of the of the translation unit.
330 std::vector<GlobalDecl> Aliases;
332 typedef llvm::StringMap<llvm::TrackingVH<llvm::Constant> > ReplacementsTy;
333 ReplacementsTy Replacements;
335 /// List of global values to be replaced with something else. Used when we
336 /// want to replace a GlobalValue but can't identify it by its mangled name
337 /// anymore (because the name is already taken).
338 llvm::SmallVector<std::pair<llvm::GlobalValue *, llvm::Constant *>, 8>
339 GlobalValReplacements;
341 /// Set of global decls for which we already diagnosed mangled name conflict.
342 /// Required to not issue a warning (on a mangling conflict) multiple times
343 /// for the same decl.
344 llvm::DenseSet<GlobalDecl> DiagnosedConflictingDefinitions;
346 /// A queue of (optional) vtables to consider emitting.
347 std::vector<const CXXRecordDecl*> DeferredVTables;
349 /// List of global values which are required to be present in the object file;
350 /// bitcast to i8*. This is used for forcing visibility of symbols which may
351 /// otherwise be optimized out.
352 std::vector<llvm::WeakVH> LLVMUsed;
353 std::vector<llvm::WeakVH> LLVMCompilerUsed;
355 /// Store the list of global constructors and their respective priorities to
356 /// be emitted when the translation unit is complete.
357 CtorList GlobalCtors;
359 /// Store the list of global destructors and their respective priorities to be
360 /// emitted when the translation unit is complete.
361 CtorList GlobalDtors;
363 /// An ordered map of canonical GlobalDecls to their mangled names.
364 llvm::MapVector<GlobalDecl, StringRef> MangledDeclNames;
365 llvm::StringMap<GlobalDecl, llvm::BumpPtrAllocator> Manglings;
367 /// Global annotations.
368 std::vector<llvm::Constant*> Annotations;
370 /// Map used to get unique annotation strings.
371 llvm::StringMap<llvm::Constant*> AnnotationStrings;
373 llvm::StringMap<llvm::GlobalVariable *> CFConstantStringMap;
375 llvm::DenseMap<llvm::Constant *, llvm::GlobalVariable *> ConstantStringMap;
376 llvm::DenseMap<const Decl*, llvm::Constant *> StaticLocalDeclMap;
377 llvm::DenseMap<const Decl*, llvm::GlobalVariable*> StaticLocalDeclGuardMap;
378 llvm::DenseMap<const Expr*, llvm::Constant *> MaterializedGlobalTemporaryMap;
380 llvm::DenseMap<QualType, llvm::Constant *> AtomicSetterHelperFnMap;
381 llvm::DenseMap<QualType, llvm::Constant *> AtomicGetterHelperFnMap;
383 /// Map used to get unique type descriptor constants for sanitizers.
384 llvm::DenseMap<QualType, llvm::Constant *> TypeDescriptorMap;
386 /// Map used to track internal linkage functions declared within
387 /// extern "C" regions.
388 typedef llvm::MapVector<IdentifierInfo *,
389 llvm::GlobalValue *> StaticExternCMap;
390 StaticExternCMap StaticExternCValues;
392 /// \brief thread_local variables defined or used in this TU.
393 std::vector<const VarDecl *> CXXThreadLocals;
395 /// \brief thread_local variables with initializers that need to run
396 /// before any thread_local variable in this TU is odr-used.
397 std::vector<llvm::Function *> CXXThreadLocalInits;
398 std::vector<const VarDecl *> CXXThreadLocalInitVars;
400 /// Global variables with initializers that need to run before main.
401 std::vector<llvm::Function *> CXXGlobalInits;
403 /// When a C++ decl with an initializer is deferred, null is
404 /// appended to CXXGlobalInits, and the index of that null is placed
405 /// here so that the initializer will be performed in the correct
406 /// order. Once the decl is emitted, the index is replaced with ~0U to ensure
407 /// that we don't re-emit the initializer.
408 llvm::DenseMap<const Decl*, unsigned> DelayedCXXInitPosition;
410 typedef std::pair<OrderGlobalInits, llvm::Function*> GlobalInitData;
412 struct GlobalInitPriorityCmp {
413 bool operator()(const GlobalInitData &LHS,
414 const GlobalInitData &RHS) const {
415 return LHS.first.priority < RHS.first.priority;
419 /// Global variables with initializers whose order of initialization is set by
420 /// init_priority attribute.
421 SmallVector<GlobalInitData, 8> PrioritizedCXXGlobalInits;
423 /// Global destructor functions and arguments that need to run on termination.
424 std::vector<std::pair<llvm::WeakVH,llvm::Constant*> > CXXGlobalDtors;
426 /// \brief The complete set of modules that has been imported.
427 llvm::SetVector<clang::Module *> ImportedModules;
429 /// \brief The set of modules for which the module initializers
430 /// have been emitted.
431 llvm::SmallPtrSet<clang::Module *, 16> EmittedModuleInitializers;
433 /// \brief A vector of metadata strings.
434 SmallVector<llvm::Metadata *, 16> LinkerOptionsMetadata;
436 /// @name Cache for Objective-C runtime types
439 /// Cached reference to the class for constant strings. This value has type
440 /// int * but is actually an Obj-C class pointer.
441 llvm::WeakVH CFConstantStringClassRef;
443 /// \brief The type used to describe the state of a fast enumeration in
444 /// Objective-C's for..in loop.
445 QualType ObjCFastEnumerationStateType;
449 /// Lazily create the Objective-C runtime
450 void createObjCRuntime();
452 void createOpenCLRuntime();
453 void createOpenMPRuntime();
454 void createCUDARuntime();
456 bool isTriviallyRecursive(const FunctionDecl *F);
457 bool shouldEmitFunction(GlobalDecl GD);
459 /// Map used to be sure we don't emit the same CompoundLiteral twice.
460 llvm::DenseMap<const CompoundLiteralExpr *, llvm::GlobalVariable *>
461 EmittedCompoundLiterals;
463 /// Map of the global blocks we've emitted, so that we don't have to re-emit
464 /// them if the constexpr evaluator gets aggressive.
465 llvm::DenseMap<const BlockExpr *, llvm::Constant *> EmittedGlobalBlocks;
467 /// @name Cache for Blocks Runtime Globals
470 llvm::Constant *NSConcreteGlobalBlock = nullptr;
471 llvm::Constant *NSConcreteStackBlock = nullptr;
473 llvm::Constant *BlockObjectAssign = nullptr;
474 llvm::Constant *BlockObjectDispose = nullptr;
476 llvm::Type *BlockDescriptorType = nullptr;
477 llvm::Type *GenericBlockLiteralType = nullptr;
480 int GlobalUniqueCount;
483 /// void @llvm.lifetime.start(i64 %size, i8* nocapture <ptr>)
484 llvm::Constant *LifetimeStartFn = nullptr;
486 /// void @llvm.lifetime.end(i64 %size, i8* nocapture <ptr>)
487 llvm::Constant *LifetimeEndFn = nullptr;
489 GlobalDecl initializedGlobalDecl;
491 std::unique_ptr<SanitizerMetadata> SanitizerMD;
495 llvm::DenseMap<const Decl *, bool> DeferredEmptyCoverageMappingDecls;
497 std::unique_ptr<CoverageMappingModuleGen> CoverageMapping;
499 /// Mapping from canonical types to their metadata identifiers. We need to
500 /// maintain this mapping because identifiers may be formed from distinct
502 llvm::DenseMap<QualType, llvm::Metadata *> MetadataIdMap;
505 CodeGenModule(ASTContext &C, const HeaderSearchOptions &headersearchopts,
506 const PreprocessorOptions &ppopts,
507 const CodeGenOptions &CodeGenOpts, llvm::Module &M,
508 DiagnosticsEngine &Diags,
509 CoverageSourceInfo *CoverageInfo = nullptr);
515 /// Finalize LLVM code generation.
518 /// Return a reference to the configured Objective-C runtime.
519 CGObjCRuntime &getObjCRuntime() {
520 if (!ObjCRuntime) createObjCRuntime();
524 /// Return true iff an Objective-C runtime has been configured.
525 bool hasObjCRuntime() { return !!ObjCRuntime; }
527 /// Return a reference to the configured OpenCL runtime.
528 CGOpenCLRuntime &getOpenCLRuntime() {
529 assert(OpenCLRuntime != nullptr);
530 return *OpenCLRuntime;
533 /// Return a reference to the configured OpenMP runtime.
534 CGOpenMPRuntime &getOpenMPRuntime() {
535 assert(OpenMPRuntime != nullptr);
536 return *OpenMPRuntime;
539 /// Return a reference to the configured CUDA runtime.
540 CGCUDARuntime &getCUDARuntime() {
541 assert(CUDARuntime != nullptr);
545 ObjCEntrypoints &getObjCEntrypoints() const {
546 assert(ObjCData != nullptr);
550 // Version checking function, used to implement ObjC's @available:
551 // i32 @__isOSVersionAtLeast(i32, i32, i32)
552 llvm::Constant *IsOSVersionAtLeastFn = nullptr;
554 InstrProfStats &getPGOStats() { return PGOStats; }
555 llvm::IndexedInstrProfReader *getPGOReader() const { return PGOReader.get(); }
557 CoverageMappingModuleGen *getCoverageMapping() const {
558 return CoverageMapping.get();
561 llvm::Constant *getStaticLocalDeclAddress(const VarDecl *D) {
562 return StaticLocalDeclMap[D];
564 void setStaticLocalDeclAddress(const VarDecl *D,
566 StaticLocalDeclMap[D] = C;
570 getOrCreateStaticVarDecl(const VarDecl &D,
571 llvm::GlobalValue::LinkageTypes Linkage);
573 llvm::GlobalVariable *getStaticLocalDeclGuardAddress(const VarDecl *D) {
574 return StaticLocalDeclGuardMap[D];
576 void setStaticLocalDeclGuardAddress(const VarDecl *D,
577 llvm::GlobalVariable *C) {
578 StaticLocalDeclGuardMap[D] = C;
581 bool lookupRepresentativeDecl(StringRef MangledName,
582 GlobalDecl &Result) const;
584 llvm::Constant *getAtomicSetterHelperFnMap(QualType Ty) {
585 return AtomicSetterHelperFnMap[Ty];
587 void setAtomicSetterHelperFnMap(QualType Ty,
588 llvm::Constant *Fn) {
589 AtomicSetterHelperFnMap[Ty] = Fn;
592 llvm::Constant *getAtomicGetterHelperFnMap(QualType Ty) {
593 return AtomicGetterHelperFnMap[Ty];
595 void setAtomicGetterHelperFnMap(QualType Ty,
596 llvm::Constant *Fn) {
597 AtomicGetterHelperFnMap[Ty] = Fn;
600 llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
601 return TypeDescriptorMap[Ty];
603 void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
604 TypeDescriptorMap[Ty] = C;
607 CGDebugInfo *getModuleDebugInfo() { return DebugInfo.get(); }
609 llvm::MDNode *getNoObjCARCExceptionsMetadata() {
610 if (!NoObjCARCExceptionsMetadata)
611 NoObjCARCExceptionsMetadata = llvm::MDNode::get(getLLVMContext(), None);
612 return NoObjCARCExceptionsMetadata;
615 ASTContext &getContext() const { return Context; }
616 const LangOptions &getLangOpts() const { return LangOpts; }
617 const HeaderSearchOptions &getHeaderSearchOpts()
618 const { return HeaderSearchOpts; }
619 const PreprocessorOptions &getPreprocessorOpts()
620 const { return PreprocessorOpts; }
621 const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
622 llvm::Module &getModule() const { return TheModule; }
623 DiagnosticsEngine &getDiags() const { return Diags; }
624 const llvm::DataLayout &getDataLayout() const {
625 return TheModule.getDataLayout();
627 const TargetInfo &getTarget() const { return Target; }
628 const llvm::Triple &getTriple() const { return Target.getTriple(); }
629 bool supportsCOMDAT() const;
630 void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO);
632 CGCXXABI &getCXXABI() const { return *ABI; }
633 llvm::LLVMContext &getLLVMContext() { return VMContext; }
635 bool shouldUseTBAA() const { return TBAA != nullptr; }
637 const TargetCodeGenInfo &getTargetCodeGenInfo();
639 CodeGenTypes &getTypes() { return Types; }
641 CodeGenVTables &getVTables() { return VTables; }
643 ItaniumVTableContext &getItaniumVTableContext() {
644 return VTables.getItaniumVTableContext();
647 MicrosoftVTableContext &getMicrosoftVTableContext() {
648 return VTables.getMicrosoftVTableContext();
651 CtorList &getGlobalCtors() { return GlobalCtors; }
652 CtorList &getGlobalDtors() { return GlobalDtors; }
654 llvm::MDNode *getTBAAInfo(QualType QTy);
655 llvm::MDNode *getTBAAInfoForVTablePtr();
656 llvm::MDNode *getTBAAStructInfo(QualType QTy);
657 /// Return the path-aware tag for given base type, access node and offset.
658 llvm::MDNode *getTBAAStructTagInfo(QualType BaseTy, llvm::MDNode *AccessN,
661 bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor);
663 bool isPaddedAtomicType(QualType type);
664 bool isPaddedAtomicType(const AtomicType *type);
666 /// Decorate the instruction with a TBAA tag. For scalar TBAA, the tag
667 /// is the same as the type. For struct-path aware TBAA, the tag
668 /// is different from the type: base type, access type and offset.
669 /// When ConvertTypeToTag is true, we create a tag based on the scalar type.
670 void DecorateInstructionWithTBAA(llvm::Instruction *Inst,
671 llvm::MDNode *TBAAInfo,
672 bool ConvertTypeToTag = true);
674 /// Adds !invariant.barrier !tag to instruction
675 void DecorateInstructionWithInvariantGroup(llvm::Instruction *I,
676 const CXXRecordDecl *RD);
678 /// Emit the given number of characters as a value of type size_t.
679 llvm::ConstantInt *getSize(CharUnits numChars);
681 /// Set the visibility for the given LLVM GlobalValue.
682 void setGlobalVisibility(llvm::GlobalValue *GV, const NamedDecl *D) const;
684 /// Set the TLS mode for the given LLVM GlobalValue for the thread-local
685 /// variable declaration D.
686 void setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const;
688 static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V) {
690 case DefaultVisibility: return llvm::GlobalValue::DefaultVisibility;
691 case HiddenVisibility: return llvm::GlobalValue::HiddenVisibility;
692 case ProtectedVisibility: return llvm::GlobalValue::ProtectedVisibility;
694 llvm_unreachable("unknown visibility!");
697 llvm::Constant *GetAddrOfGlobal(GlobalDecl GD,
698 ForDefinition_t IsForDefinition
701 /// Will return a global variable of the given type. If a variable with a
702 /// different type already exists then a new variable with the right type
703 /// will be created and all uses of the old variable will be replaced with a
704 /// bitcast to the new variable.
705 llvm::GlobalVariable *
706 CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty,
707 llvm::GlobalValue::LinkageTypes Linkage);
710 CreateGlobalInitOrDestructFunction(llvm::FunctionType *ty, const Twine &name,
711 const CGFunctionInfo &FI,
712 SourceLocation Loc = SourceLocation(),
715 /// Return the address space of the underlying global variable for D, as
716 /// determined by its declaration. Normally this is the same as the address
717 /// space of D's type, but in CUDA, address spaces are associated with
718 /// declarations, not types.
719 unsigned GetGlobalVarAddressSpace(const VarDecl *D, unsigned AddrSpace);
721 /// Return the llvm::Constant for the address of the given global variable.
722 /// If Ty is non-null and if the global doesn't exist, then it will be created
723 /// with the specified type instead of whatever the normal requested type
724 /// would be. If IsForDefinition is true, it is guranteed that an actual
725 /// global with type Ty will be returned, not conversion of a variable with
726 /// the same mangled name but some other type.
727 llvm::Constant *GetAddrOfGlobalVar(const VarDecl *D,
728 llvm::Type *Ty = nullptr,
729 ForDefinition_t IsForDefinition
732 /// Return the address of the given function. If Ty is non-null, then this
733 /// function will use the specified type if it has to create it.
734 llvm::Constant *GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty = nullptr,
735 bool ForVTable = false,
736 bool DontDefer = false,
737 ForDefinition_t IsForDefinition
740 /// Get the address of the RTTI descriptor for the given type.
741 llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH = false);
743 /// Get the address of a uuid descriptor .
744 ConstantAddress GetAddrOfUuidDescriptor(const CXXUuidofExpr* E);
746 /// Get the address of the thunk for the given global decl.
747 llvm::Constant *GetAddrOfThunk(GlobalDecl GD, const ThunkInfo &Thunk);
749 /// Get a reference to the target of VD.
750 ConstantAddress GetWeakRefReference(const ValueDecl *VD);
752 /// Returns the assumed alignment of an opaque pointer to the given class.
753 CharUnits getClassPointerAlignment(const CXXRecordDecl *CD);
755 /// Returns the assumed alignment of a virtual base of a class.
756 CharUnits getVBaseAlignment(CharUnits DerivedAlign,
757 const CXXRecordDecl *Derived,
758 const CXXRecordDecl *VBase);
760 /// Given a class pointer with an actual known alignment, and the
761 /// expected alignment of an object at a dynamic offset w.r.t that
762 /// pointer, return the alignment to assume at the offset.
763 CharUnits getDynamicOffsetAlignment(CharUnits ActualAlign,
764 const CXXRecordDecl *Class,
765 CharUnits ExpectedTargetAlign);
768 computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass,
769 CastExpr::path_const_iterator Start,
770 CastExpr::path_const_iterator End);
772 /// Returns the offset from a derived class to a class. Returns null if the
775 GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
776 CastExpr::path_const_iterator PathBegin,
777 CastExpr::path_const_iterator PathEnd);
779 llvm::FoldingSet<BlockByrefHelpers> ByrefHelpersCache;
781 /// Fetches the global unique block count.
782 int getUniqueBlockCount() { return ++Block.GlobalUniqueCount; }
784 /// Fetches the type of a generic block descriptor.
785 llvm::Type *getBlockDescriptorType();
787 /// The type of a generic block literal.
788 llvm::Type *getGenericBlockLiteralType();
790 /// Gets the address of a block which requires no captures.
791 llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, StringRef Name);
793 /// Returns the address of a block which requires no caputres, or null if
794 /// we've yet to emit the block for BE.
795 llvm::Constant *getAddrOfGlobalBlockIfEmitted(const BlockExpr *BE) {
796 return EmittedGlobalBlocks.lookup(BE);
799 /// Notes that BE's global block is available via Addr. Asserts that BE
800 /// isn't already emitted.
801 void setAddrOfGlobalBlock(const BlockExpr *BE, llvm::Constant *Addr);
803 /// Return a pointer to a constant CFString object for the given string.
804 ConstantAddress GetAddrOfConstantCFString(const StringLiteral *Literal);
806 /// Return a pointer to a constant NSString object for the given string. Or a
807 /// user defined String object as defined via
808 /// -fconstant-string-class=class_name option.
809 ConstantAddress GetAddrOfConstantString(const StringLiteral *Literal);
811 /// Return a constant array for the given string.
812 llvm::Constant *GetConstantArrayFromStringLiteral(const StringLiteral *E);
814 /// Return a pointer to a constant array for the given string literal.
816 GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
817 StringRef Name = ".str");
819 /// Return a pointer to a constant array for the given ObjCEncodeExpr node.
821 GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
823 /// Returns a pointer to a character array containing the literal and a
824 /// terminating '\0' character. The result has pointer to array type.
826 /// \param GlobalName If provided, the name to use for the global (if one is
829 GetAddrOfConstantCString(const std::string &Str,
830 const char *GlobalName = nullptr);
832 /// Returns a pointer to a constant global variable for the given file-scope
833 /// compound literal expression.
834 ConstantAddress GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr*E);
836 /// If it's been emitted already, returns the GlobalVariable corresponding to
837 /// a compound literal. Otherwise, returns null.
838 llvm::GlobalVariable *
839 getAddrOfConstantCompoundLiteralIfEmitted(const CompoundLiteralExpr *E);
841 /// Notes that CLE's GlobalVariable is GV. Asserts that CLE isn't already
843 void setAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *CLE,
844 llvm::GlobalVariable *GV);
846 /// \brief Returns a pointer to a global variable representing a temporary
847 /// with static or thread storage duration.
848 ConstantAddress GetAddrOfGlobalTemporary(const MaterializeTemporaryExpr *E,
851 /// \brief Retrieve the record type that describes the state of an
852 /// Objective-C fast enumeration loop (for..in).
853 QualType getObjCFastEnumerationStateType();
855 // Produce code for this constructor/destructor. This method doesn't try
856 // to apply any ABI rules about which other constructors/destructors
857 // are needed or if they are alias to each other.
858 llvm::Function *codegenCXXStructor(const CXXMethodDecl *MD,
861 /// Return the address of the constructor/destructor of the given type.
863 getAddrOfCXXStructor(const CXXMethodDecl *MD, StructorType Type,
864 const CGFunctionInfo *FnInfo = nullptr,
865 llvm::FunctionType *FnType = nullptr,
866 bool DontDefer = false,
867 ForDefinition_t IsForDefinition = NotForDefinition);
869 /// Given a builtin id for a function like "__builtin_fabsf", return a
870 /// Function* for "fabsf".
871 llvm::Constant *getBuiltinLibFunction(const FunctionDecl *FD,
874 llvm::Function *getIntrinsic(unsigned IID, ArrayRef<llvm::Type*> Tys = None);
876 /// Emit code for a single top level declaration.
877 void EmitTopLevelDecl(Decl *D);
879 /// \brief Stored a deferred empty coverage mapping for an unused
880 /// and thus uninstrumented top level declaration.
881 void AddDeferredUnusedCoverageMapping(Decl *D);
883 /// \brief Remove the deferred empty coverage mapping as this
884 /// declaration is actually instrumented.
885 void ClearUnusedCoverageMapping(const Decl *D);
887 /// \brief Emit all the deferred coverage mappings
888 /// for the uninstrumented functions.
889 void EmitDeferredUnusedCoverageMappings();
891 /// Tell the consumer that this variable has been instantiated.
892 void HandleCXXStaticMemberVarInstantiation(VarDecl *VD);
894 /// \brief If the declaration has internal linkage but is inside an
895 /// extern "C" linkage specification, prepare to emit an alias for it
896 /// to the expected name.
897 template<typename SomeDecl>
898 void MaybeHandleStaticInExternC(const SomeDecl *D, llvm::GlobalValue *GV);
900 /// Add a global to a list to be added to the llvm.used metadata.
901 void addUsedGlobal(llvm::GlobalValue *GV);
903 /// Add a global to a list to be added to the llvm.compiler.used metadata.
904 void addCompilerUsedGlobal(llvm::GlobalValue *GV);
906 /// Add a destructor and object to add to the C++ global destructor function.
907 void AddCXXDtorEntry(llvm::Constant *DtorFn, llvm::Constant *Object) {
908 CXXGlobalDtors.emplace_back(DtorFn, Object);
911 /// Create a new runtime function with the specified type and name.
913 CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name,
914 llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
917 /// Create a new compiler builtin function with the specified type and name.
919 CreateBuiltinFunction(llvm::FunctionType *Ty, StringRef Name,
920 llvm::AttributeList ExtraAttrs = llvm::AttributeList());
921 /// Create a new runtime global variable with the specified type and name.
922 llvm::Constant *CreateRuntimeVariable(llvm::Type *Ty,
925 ///@name Custom Blocks Runtime Interfaces
928 llvm::Constant *getNSConcreteGlobalBlock();
929 llvm::Constant *getNSConcreteStackBlock();
930 llvm::Constant *getBlockObjectAssign();
931 llvm::Constant *getBlockObjectDispose();
935 llvm::Constant *getLLVMLifetimeStartFn();
936 llvm::Constant *getLLVMLifetimeEndFn();
938 // Make sure that this type is translated.
939 void UpdateCompletedType(const TagDecl *TD);
941 llvm::Constant *getMemberPointerConstant(const UnaryOperator *e);
943 /// Try to emit the initializer for the given declaration as a constant;
944 /// returns 0 if the expression cannot be emitted as a constant.
945 llvm::Constant *EmitConstantInit(const VarDecl &D,
946 CodeGenFunction *CGF = nullptr);
948 /// Try to emit the given expression as a constant; returns 0 if the
949 /// expression cannot be emitted as a constant.
950 llvm::Constant *EmitConstantExpr(const Expr *E, QualType DestType,
951 CodeGenFunction *CGF = nullptr);
953 /// Emit the given constant value as a constant, in the type's scalar
955 llvm::Constant *EmitConstantValue(const APValue &Value, QualType DestType,
956 CodeGenFunction *CGF = nullptr);
958 /// Emit the given constant value as a constant, in the type's memory
960 llvm::Constant *EmitConstantValueForMemory(const APValue &Value,
962 CodeGenFunction *CGF = nullptr);
964 /// \brief Emit type info if type of an expression is a variably modified
965 /// type. Also emit proper debug info for cast types.
966 void EmitExplicitCastExprType(const ExplicitCastExpr *E,
967 CodeGenFunction *CGF = nullptr);
969 /// Return the result of value-initializing the given type, i.e. a null
970 /// expression of the given type. This is usually, but not always, an LLVM
972 llvm::Constant *EmitNullConstant(QualType T);
974 /// Return a null constant appropriate for zero-initializing a base class with
975 /// the given type. This is usually, but not always, an LLVM null constant.
976 llvm::Constant *EmitNullConstantForBase(const CXXRecordDecl *Record);
978 /// Emit a general error that something can't be done.
979 void Error(SourceLocation loc, StringRef error);
981 /// Print out an error that codegen doesn't support the specified stmt yet.
982 void ErrorUnsupported(const Stmt *S, const char *Type);
984 /// Print out an error that codegen doesn't support the specified decl yet.
985 void ErrorUnsupported(const Decl *D, const char *Type);
987 /// Set the attributes on the LLVM function for the given decl and function
988 /// info. This applies attributes necessary for handling the ABI as well as
989 /// user specified attributes like section.
990 void SetInternalFunctionAttributes(const Decl *D, llvm::Function *F,
991 const CGFunctionInfo &FI);
993 /// Set the LLVM function attributes (sext, zext, etc).
994 void SetLLVMFunctionAttributes(const Decl *D,
995 const CGFunctionInfo &Info,
998 /// Set the LLVM function attributes which only apply to a function
1000 void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F);
1002 /// Return true iff the given type uses 'sret' when used as a return type.
1003 bool ReturnTypeUsesSRet(const CGFunctionInfo &FI);
1005 /// Return true iff the given type uses an argument slot when 'sret' is used
1006 /// as a return type.
1007 bool ReturnSlotInterferesWithArgs(const CGFunctionInfo &FI);
1009 /// Return true iff the given type uses 'fpret' when used as a return type.
1010 bool ReturnTypeUsesFPRet(QualType ResultType);
1012 /// Return true iff the given type uses 'fp2ret' when used as a return type.
1013 bool ReturnTypeUsesFP2Ret(QualType ResultType);
1015 /// Get the LLVM attributes and calling convention to use for a particular
1018 /// \param Name - The function name.
1019 /// \param Info - The function type information.
1020 /// \param CalleeInfo - The callee information these attributes are being
1021 /// constructed for. If valid, the attributes applied to this decl may
1022 /// contribute to the function attributes and calling convention.
1023 /// \param PAL [out] - On return, the attribute list to use.
1024 /// \param CallingConv [out] - On return, the LLVM calling convention to use.
1025 void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info,
1026 CGCalleeInfo CalleeInfo, AttributeListType &PAL,
1027 unsigned &CallingConv, bool AttrOnCallSite);
1029 /// Adds attributes to F according to our CodeGenOptions and LangOptions, as
1030 /// though we had emitted it ourselves. We remove any attributes on F that
1031 /// conflict with the attributes we add here.
1033 /// This is useful for adding attrs to bitcode modules that you want to link
1034 /// with but don't control, such as CUDA's libdevice. When linking with such
1035 /// a bitcode library, you might want to set e.g. its functions'
1036 /// "unsafe-fp-math" attribute to match the attr of the functions you're
1037 /// codegen'ing. Otherwise, LLVM will interpret the bitcode module's lack of
1038 /// unsafe-fp-math attrs as tantamount to unsafe-fp-math=false, and then LLVM
1039 /// will propagate unsafe-fp-math=false up to every transitive caller of a
1040 /// function in the bitcode library!
1042 /// With the exception of fast-math attrs, this will only make the attributes
1043 /// on the function more conservative. But it's unsafe to call this on a
1044 /// function which relies on particular fast-math attributes for correctness.
1045 /// It's up to you to ensure that this is safe.
1046 void AddDefaultFnAttrs(llvm::Function &F);
1048 // Fills in the supplied string map with the set of target features for the
1049 // passed in function.
1050 void getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
1051 const FunctionDecl *FD);
1053 StringRef getMangledName(GlobalDecl GD);
1054 StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
1056 void EmitTentativeDefinition(const VarDecl *D);
1058 void EmitVTable(CXXRecordDecl *Class);
1060 void RefreshTypeCacheForClass(const CXXRecordDecl *Class);
1062 /// \brief Appends Opts to the "Linker Options" metadata value.
1063 void AppendLinkerOptions(StringRef Opts);
1065 /// \brief Appends a detect mismatch command to the linker options.
1066 void AddDetectMismatch(StringRef Name, StringRef Value);
1068 /// \brief Appends a dependent lib to the "Linker Options" metadata value.
1069 void AddDependentLib(StringRef Lib);
1071 llvm::GlobalVariable::LinkageTypes getFunctionLinkage(GlobalDecl GD);
1073 void setFunctionLinkage(GlobalDecl GD, llvm::Function *F) {
1074 F->setLinkage(getFunctionLinkage(GD));
1077 /// Set the DLL storage class on F.
1078 void setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F);
1080 /// Return the appropriate linkage for the vtable, VTT, and type information
1081 /// of the given class.
1082 llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);
1084 /// Return the store size, in character units, of the given LLVM type.
1085 CharUnits GetTargetTypeStoreSize(llvm::Type *Ty) const;
1087 /// Returns LLVM linkage for a declarator.
1088 llvm::GlobalValue::LinkageTypes
1089 getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage,
1090 bool IsConstantVariable);
1092 /// Returns LLVM linkage for a declarator.
1093 llvm::GlobalValue::LinkageTypes
1094 getLLVMLinkageVarDefinition(const VarDecl *VD, bool IsConstant);
1096 /// Emit all the global annotations.
1097 void EmitGlobalAnnotations();
1099 /// Emit an annotation string.
1100 llvm::Constant *EmitAnnotationString(StringRef Str);
1102 /// Emit the annotation's translation unit.
1103 llvm::Constant *EmitAnnotationUnit(SourceLocation Loc);
1105 /// Emit the annotation line number.
1106 llvm::Constant *EmitAnnotationLineNo(SourceLocation L);
1108 /// Generate the llvm::ConstantStruct which contains the annotation
1109 /// information for a given GlobalValue. The annotation struct is
1110 /// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the
1111 /// GlobalValue being annotated. The second field is the constant string
1112 /// created from the AnnotateAttr's annotation. The third field is a constant
1113 /// string containing the name of the translation unit. The fourth field is
1114 /// the line number in the file of the annotated value declaration.
1115 llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
1116 const AnnotateAttr *AA,
1119 /// Add global annotations that are set on D, for the global GV. Those
1120 /// annotations are emitted during finalization of the LLVM code.
1121 void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV);
1123 bool isInSanitizerBlacklist(llvm::Function *Fn, SourceLocation Loc) const;
1125 bool isInSanitizerBlacklist(llvm::GlobalVariable *GV, SourceLocation Loc,
1127 StringRef Category = StringRef()) const;
1129 /// Imbue XRay attributes to a function, applying the always/never attribute
1130 /// lists in the process. Returns true if we did imbue attributes this way,
1131 /// false otherwise.
1132 bool imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
1133 StringRef Category = StringRef()) const;
1135 SanitizerMetadata *getSanitizerMetadata() {
1136 return SanitizerMD.get();
1139 void addDeferredVTable(const CXXRecordDecl *RD) {
1140 DeferredVTables.push_back(RD);
1143 /// Emit code for a singal global function or var decl. Forward declarations
1144 /// are emitted lazily.
1145 void EmitGlobal(GlobalDecl D);
1147 bool TryEmitDefinitionAsAlias(GlobalDecl Alias, GlobalDecl Target,
1149 bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
1151 /// Set attributes for a global definition.
1152 void setFunctionDefinitionAttributes(const FunctionDecl *D,
1155 llvm::GlobalValue *GetGlobalValue(StringRef Ref);
1157 /// Set attributes which are common to any form of a global definition (alias,
1158 /// Objective-C method, function, global variable).
1160 /// NOTE: This should only be called for definitions.
1161 void SetCommonAttributes(const Decl *D, llvm::GlobalValue *GV);
1163 /// Set attributes which must be preserved by an alias. This includes common
1164 /// attributes (i.e. it includes a call to SetCommonAttributes).
1166 /// NOTE: This should only be called for definitions.
1167 void setAliasAttributes(const Decl *D, llvm::GlobalValue *GV);
1169 void addReplacement(StringRef Name, llvm::Constant *C);
1171 void addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C);
1173 /// \brief Emit a code for threadprivate directive.
1174 /// \param D Threadprivate declaration.
1175 void EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D);
1177 /// \brief Emit a code for declare reduction construct.
1178 void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
1179 CodeGenFunction *CGF = nullptr);
1181 /// Returns whether the given record has hidden LTO visibility and therefore
1182 /// may participate in (single-module) CFI and whole-program vtable
1184 bool HasHiddenLTOVisibility(const CXXRecordDecl *RD);
1186 /// Emit type metadata for the given vtable using the given layout.
1187 void EmitVTableTypeMetadata(llvm::GlobalVariable *VTable,
1188 const VTableLayout &VTLayout);
1190 /// Generate a cross-DSO type identifier for MD.
1191 llvm::ConstantInt *CreateCrossDsoCfiTypeId(llvm::Metadata *MD);
1193 /// Create a metadata identifier for the given type. This may either be an
1194 /// MDString (for external identifiers) or a distinct unnamed MDNode (for
1195 /// internal identifiers).
1196 llvm::Metadata *CreateMetadataIdentifierForType(QualType T);
1198 /// Create and attach type metadata to the given function.
1199 void CreateFunctionTypeMetadata(const FunctionDecl *FD, llvm::Function *F);
1201 /// Returns whether this module needs the "all-vtables" type identifier.
1202 bool NeedAllVtablesTypeId() const;
1204 /// Create and attach type metadata for the given vtable.
1205 void AddVTableTypeMetadata(llvm::GlobalVariable *VTable, CharUnits Offset,
1206 const CXXRecordDecl *RD);
1208 /// \brief Get the declaration of std::terminate for the platform.
1209 llvm::Constant *getTerminateFn();
1211 llvm::SanitizerStatReport &getSanStats();
1214 createOpenCLIntToSamplerConversion(const Expr *E, CodeGenFunction &CGF);
1216 /// Get target specific null pointer.
1217 /// \param T is the LLVM type of the null pointer.
1218 /// \param QT is the clang QualType of the null pointer.
1219 llvm::Constant *getNullPointer(llvm::PointerType *T, QualType QT);
1222 llvm::Constant *GetOrCreateLLVMFunction(
1223 StringRef MangledName, llvm::Type *Ty, GlobalDecl D, bool ForVTable,
1224 bool DontDefer = false, bool IsThunk = false,
1225 llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
1226 ForDefinition_t IsForDefinition = NotForDefinition);
1228 llvm::Constant *GetOrCreateLLVMGlobal(StringRef MangledName,
1229 llvm::PointerType *PTy,
1231 ForDefinition_t IsForDefinition
1232 = NotForDefinition);
1234 void setNonAliasAttributes(const Decl *D, llvm::GlobalObject *GO);
1236 /// Set function attributes for a function declaration.
1237 void SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1238 bool IsIncompleteFunction, bool IsThunk);
1240 void EmitGlobalDefinition(GlobalDecl D, llvm::GlobalValue *GV = nullptr);
1242 void EmitGlobalFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
1243 void EmitGlobalVarDefinition(const VarDecl *D, bool IsTentative = false);
1244 void EmitAliasDefinition(GlobalDecl GD);
1245 void emitIFuncDefinition(GlobalDecl GD);
1246 void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
1247 void EmitObjCIvarInitializations(ObjCImplementationDecl *D);
1249 // C++ related functions.
1251 void EmitDeclContext(const DeclContext *DC);
1252 void EmitLinkageSpec(const LinkageSpecDecl *D);
1254 /// \brief Emit the function that initializes C++ thread_local variables.
1255 void EmitCXXThreadLocalInitFunc();
1257 /// Emit the function that initializes C++ globals.
1258 void EmitCXXGlobalInitFunc();
1260 /// Emit the function that destroys C++ globals.
1261 void EmitCXXGlobalDtorFunc();
1263 /// Emit the function that initializes the specified global (if PerformInit is
1264 /// true) and registers its destructor.
1265 void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
1266 llvm::GlobalVariable *Addr,
1269 void EmitPointerToInitFunc(const VarDecl *VD, llvm::GlobalVariable *Addr,
1270 llvm::Function *InitFunc, InitSegAttr *ISA);
1272 // FIXME: Hardcoding priority here is gross.
1273 void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
1274 llvm::Constant *AssociatedData = nullptr);
1275 void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535);
1277 /// EmitCtorList - Generates a global array of functions and priorities using
1278 /// the given list and name. This array will have appending linkage and is
1279 /// suitable for use as a LLVM constructor or destructor array. Clears Fns.
1280 void EmitCtorList(CtorList &Fns, const char *GlobalName);
1282 /// Emit any needed decls for which code generation was deferred.
1283 void EmitDeferred();
1285 /// Call replaceAllUsesWith on all pairs in Replacements.
1286 void applyReplacements();
1288 /// Call replaceAllUsesWith on all pairs in GlobalValReplacements.
1289 void applyGlobalValReplacements();
1291 void checkAliases();
1293 /// Emit any vtables which we deferred and still have a use for.
1294 void EmitDeferredVTables();
1296 /// Emit a dummy function that reference a CoreFoundation symbol when
1297 /// @available is used on Darwin.
1298 void emitAtAvailableLinkGuard();
1300 /// Emit the llvm.used and llvm.compiler.used metadata.
1301 void emitLLVMUsed();
1303 /// \brief Emit the link options introduced by imported modules.
1304 void EmitModuleLinkOptions();
1306 /// \brief Emit aliases for internal-linkage declarations inside "C" language
1307 /// linkage specifications, giving them the "expected" name where possible.
1308 void EmitStaticExternCAliases();
1310 void EmitDeclMetadata();
1312 /// \brief Emit the Clang version as llvm.ident metadata.
1313 void EmitVersionIdentMetadata();
1315 /// Emits target specific Metadata for global declarations.
1316 void EmitTargetMetadata();
1318 /// Emit the llvm.gcov metadata used to tell LLVM where to emit the .gcno and
1319 /// .gcda files in a way that persists in .bc files.
1320 void EmitCoverageFile();
1322 /// Emits the initializer for a uuidof string.
1323 llvm::Constant *EmitUuidofInitializer(StringRef uuidstr);
1325 /// Determine whether the definition must be emitted; if this returns \c
1326 /// false, the definition can be emitted lazily if it's used.
1327 bool MustBeEmitted(const ValueDecl *D);
1329 /// Determine whether the definition can be emitted eagerly, or should be
1330 /// delayed until the end of the translation unit. This is relevant for
1331 /// definitions whose linkage can change, e.g. implicit function instantions
1332 /// which may later be explicitly instantiated.
1333 bool MayBeEmittedEagerly(const ValueDecl *D);
1335 /// Check whether we can use a "simpler", more core exceptions personality
1337 void SimplifyPersonality();
1339 /// Helper function for ConstructAttributeList and AddDefaultFnAttrs.
1340 /// Constructs an AttrList for a function with the given properties.
1341 void ConstructDefaultFnAttrList(StringRef Name, bool HasOptnone,
1342 bool AttrOnCallSite,
1343 llvm::AttrBuilder &FuncAttrs);
1345 } // end namespace CodeGen
1346 } // end namespace clang
1348 #endif // LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H