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 std::vector<GlobalDecl> DeferredDeclsToEmit;
319 void addDeferredDeclToEmit(GlobalDecl GD) {
320 DeferredDeclsToEmit.emplace_back(GD);
323 /// List of alias we have emitted. Used to make sure that what they point to
324 /// is defined once we get to the end of the of the translation unit.
325 std::vector<GlobalDecl> Aliases;
327 typedef llvm::StringMap<llvm::TrackingVH<llvm::Constant> > ReplacementsTy;
328 ReplacementsTy Replacements;
330 /// List of global values to be replaced with something else. Used when we
331 /// want to replace a GlobalValue but can't identify it by its mangled name
332 /// anymore (because the name is already taken).
333 llvm::SmallVector<std::pair<llvm::GlobalValue *, llvm::Constant *>, 8>
334 GlobalValReplacements;
336 /// Set of global decls for which we already diagnosed mangled name conflict.
337 /// Required to not issue a warning (on a mangling conflict) multiple times
338 /// for the same decl.
339 llvm::DenseSet<GlobalDecl> DiagnosedConflictingDefinitions;
341 /// A queue of (optional) vtables to consider emitting.
342 std::vector<const CXXRecordDecl*> DeferredVTables;
344 /// List of global values which are required to be present in the object file;
345 /// bitcast to i8*. This is used for forcing visibility of symbols which may
346 /// otherwise be optimized out.
347 std::vector<llvm::WeakTrackingVH> LLVMUsed;
348 std::vector<llvm::WeakTrackingVH> LLVMCompilerUsed;
350 /// Store the list of global constructors and their respective priorities to
351 /// be emitted when the translation unit is complete.
352 CtorList GlobalCtors;
354 /// Store the list of global destructors and their respective priorities to be
355 /// emitted when the translation unit is complete.
356 CtorList GlobalDtors;
358 /// An ordered map of canonical GlobalDecls to their mangled names.
359 llvm::MapVector<GlobalDecl, StringRef> MangledDeclNames;
360 llvm::StringMap<GlobalDecl, llvm::BumpPtrAllocator> Manglings;
362 /// Global annotations.
363 std::vector<llvm::Constant*> Annotations;
365 /// Map used to get unique annotation strings.
366 llvm::StringMap<llvm::Constant*> AnnotationStrings;
368 llvm::StringMap<llvm::GlobalVariable *> CFConstantStringMap;
370 llvm::DenseMap<llvm::Constant *, llvm::GlobalVariable *> ConstantStringMap;
371 llvm::DenseMap<const Decl*, llvm::Constant *> StaticLocalDeclMap;
372 llvm::DenseMap<const Decl*, llvm::GlobalVariable*> StaticLocalDeclGuardMap;
373 llvm::DenseMap<const Expr*, llvm::Constant *> MaterializedGlobalTemporaryMap;
375 llvm::DenseMap<QualType, llvm::Constant *> AtomicSetterHelperFnMap;
376 llvm::DenseMap<QualType, llvm::Constant *> AtomicGetterHelperFnMap;
378 /// Map used to get unique type descriptor constants for sanitizers.
379 llvm::DenseMap<QualType, llvm::Constant *> TypeDescriptorMap;
381 /// Map used to track internal linkage functions declared within
382 /// extern "C" regions.
383 typedef llvm::MapVector<IdentifierInfo *,
384 llvm::GlobalValue *> StaticExternCMap;
385 StaticExternCMap StaticExternCValues;
387 /// \brief thread_local variables defined or used in this TU.
388 std::vector<const VarDecl *> CXXThreadLocals;
390 /// \brief thread_local variables with initializers that need to run
391 /// before any thread_local variable in this TU is odr-used.
392 std::vector<llvm::Function *> CXXThreadLocalInits;
393 std::vector<const VarDecl *> CXXThreadLocalInitVars;
395 /// Global variables with initializers that need to run before main.
396 std::vector<llvm::Function *> CXXGlobalInits;
398 /// When a C++ decl with an initializer is deferred, null is
399 /// appended to CXXGlobalInits, and the index of that null is placed
400 /// here so that the initializer will be performed in the correct
401 /// order. Once the decl is emitted, the index is replaced with ~0U to ensure
402 /// that we don't re-emit the initializer.
403 llvm::DenseMap<const Decl*, unsigned> DelayedCXXInitPosition;
405 typedef std::pair<OrderGlobalInits, llvm::Function*> GlobalInitData;
407 struct GlobalInitPriorityCmp {
408 bool operator()(const GlobalInitData &LHS,
409 const GlobalInitData &RHS) const {
410 return LHS.first.priority < RHS.first.priority;
414 /// Global variables with initializers whose order of initialization is set by
415 /// init_priority attribute.
416 SmallVector<GlobalInitData, 8> PrioritizedCXXGlobalInits;
418 /// Global destructor functions and arguments that need to run on termination.
419 std::vector<std::pair<llvm::WeakTrackingVH, llvm::Constant *>> CXXGlobalDtors;
421 /// \brief The complete set of modules that has been imported.
422 llvm::SetVector<clang::Module *> ImportedModules;
424 /// \brief The set of modules for which the module initializers
425 /// have been emitted.
426 llvm::SmallPtrSet<clang::Module *, 16> EmittedModuleInitializers;
428 /// \brief A vector of metadata strings.
429 SmallVector<llvm::Metadata *, 16> LinkerOptionsMetadata;
431 /// @name Cache for Objective-C runtime types
434 /// Cached reference to the class for constant strings. This value has type
435 /// int * but is actually an Obj-C class pointer.
436 llvm::WeakTrackingVH CFConstantStringClassRef;
438 /// \brief The type used to describe the state of a fast enumeration in
439 /// Objective-C's for..in loop.
440 QualType ObjCFastEnumerationStateType;
444 /// Lazily create the Objective-C runtime
445 void createObjCRuntime();
447 void createOpenCLRuntime();
448 void createOpenMPRuntime();
449 void createCUDARuntime();
451 bool isTriviallyRecursive(const FunctionDecl *F);
452 bool shouldEmitFunction(GlobalDecl GD);
454 /// Map used to be sure we don't emit the same CompoundLiteral twice.
455 llvm::DenseMap<const CompoundLiteralExpr *, llvm::GlobalVariable *>
456 EmittedCompoundLiterals;
458 /// Map of the global blocks we've emitted, so that we don't have to re-emit
459 /// them if the constexpr evaluator gets aggressive.
460 llvm::DenseMap<const BlockExpr *, llvm::Constant *> EmittedGlobalBlocks;
462 /// @name Cache for Blocks Runtime Globals
465 llvm::Constant *NSConcreteGlobalBlock = nullptr;
466 llvm::Constant *NSConcreteStackBlock = nullptr;
468 llvm::Constant *BlockObjectAssign = nullptr;
469 llvm::Constant *BlockObjectDispose = nullptr;
471 llvm::Type *BlockDescriptorType = nullptr;
472 llvm::Type *GenericBlockLiteralType = nullptr;
475 int GlobalUniqueCount;
478 /// void @llvm.lifetime.start(i64 %size, i8* nocapture <ptr>)
479 llvm::Constant *LifetimeStartFn = nullptr;
481 /// void @llvm.lifetime.end(i64 %size, i8* nocapture <ptr>)
482 llvm::Constant *LifetimeEndFn = nullptr;
484 GlobalDecl initializedGlobalDecl;
486 std::unique_ptr<SanitizerMetadata> SanitizerMD;
490 llvm::DenseMap<const Decl *, bool> DeferredEmptyCoverageMappingDecls;
492 std::unique_ptr<CoverageMappingModuleGen> CoverageMapping;
494 /// Mapping from canonical types to their metadata identifiers. We need to
495 /// maintain this mapping because identifiers may be formed from distinct
497 llvm::DenseMap<QualType, llvm::Metadata *> MetadataIdMap;
500 CodeGenModule(ASTContext &C, const HeaderSearchOptions &headersearchopts,
501 const PreprocessorOptions &ppopts,
502 const CodeGenOptions &CodeGenOpts, llvm::Module &M,
503 DiagnosticsEngine &Diags,
504 CoverageSourceInfo *CoverageInfo = nullptr);
510 /// Finalize LLVM code generation.
513 /// Return a reference to the configured Objective-C runtime.
514 CGObjCRuntime &getObjCRuntime() {
515 if (!ObjCRuntime) createObjCRuntime();
519 /// Return true iff an Objective-C runtime has been configured.
520 bool hasObjCRuntime() { return !!ObjCRuntime; }
522 /// Return a reference to the configured OpenCL runtime.
523 CGOpenCLRuntime &getOpenCLRuntime() {
524 assert(OpenCLRuntime != nullptr);
525 return *OpenCLRuntime;
528 /// Return a reference to the configured OpenMP runtime.
529 CGOpenMPRuntime &getOpenMPRuntime() {
530 assert(OpenMPRuntime != nullptr);
531 return *OpenMPRuntime;
534 /// Return a reference to the configured CUDA runtime.
535 CGCUDARuntime &getCUDARuntime() {
536 assert(CUDARuntime != nullptr);
540 ObjCEntrypoints &getObjCEntrypoints() const {
541 assert(ObjCData != nullptr);
545 // Version checking function, used to implement ObjC's @available:
546 // i32 @__isOSVersionAtLeast(i32, i32, i32)
547 llvm::Constant *IsOSVersionAtLeastFn = nullptr;
549 InstrProfStats &getPGOStats() { return PGOStats; }
550 llvm::IndexedInstrProfReader *getPGOReader() const { return PGOReader.get(); }
552 CoverageMappingModuleGen *getCoverageMapping() const {
553 return CoverageMapping.get();
556 llvm::Constant *getStaticLocalDeclAddress(const VarDecl *D) {
557 return StaticLocalDeclMap[D];
559 void setStaticLocalDeclAddress(const VarDecl *D,
561 StaticLocalDeclMap[D] = C;
565 getOrCreateStaticVarDecl(const VarDecl &D,
566 llvm::GlobalValue::LinkageTypes Linkage);
568 llvm::GlobalVariable *getStaticLocalDeclGuardAddress(const VarDecl *D) {
569 return StaticLocalDeclGuardMap[D];
571 void setStaticLocalDeclGuardAddress(const VarDecl *D,
572 llvm::GlobalVariable *C) {
573 StaticLocalDeclGuardMap[D] = C;
576 bool lookupRepresentativeDecl(StringRef MangledName,
577 GlobalDecl &Result) const;
579 llvm::Constant *getAtomicSetterHelperFnMap(QualType Ty) {
580 return AtomicSetterHelperFnMap[Ty];
582 void setAtomicSetterHelperFnMap(QualType Ty,
583 llvm::Constant *Fn) {
584 AtomicSetterHelperFnMap[Ty] = Fn;
587 llvm::Constant *getAtomicGetterHelperFnMap(QualType Ty) {
588 return AtomicGetterHelperFnMap[Ty];
590 void setAtomicGetterHelperFnMap(QualType Ty,
591 llvm::Constant *Fn) {
592 AtomicGetterHelperFnMap[Ty] = Fn;
595 llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
596 return TypeDescriptorMap[Ty];
598 void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
599 TypeDescriptorMap[Ty] = C;
602 CGDebugInfo *getModuleDebugInfo() { return DebugInfo.get(); }
604 llvm::MDNode *getNoObjCARCExceptionsMetadata() {
605 if (!NoObjCARCExceptionsMetadata)
606 NoObjCARCExceptionsMetadata = llvm::MDNode::get(getLLVMContext(), None);
607 return NoObjCARCExceptionsMetadata;
610 ASTContext &getContext() const { return Context; }
611 const LangOptions &getLangOpts() const { return LangOpts; }
612 const HeaderSearchOptions &getHeaderSearchOpts()
613 const { return HeaderSearchOpts; }
614 const PreprocessorOptions &getPreprocessorOpts()
615 const { return PreprocessorOpts; }
616 const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
617 llvm::Module &getModule() const { return TheModule; }
618 DiagnosticsEngine &getDiags() const { return Diags; }
619 const llvm::DataLayout &getDataLayout() const {
620 return TheModule.getDataLayout();
622 const TargetInfo &getTarget() const { return Target; }
623 const llvm::Triple &getTriple() const { return Target.getTriple(); }
624 bool supportsCOMDAT() const;
625 void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO);
627 CGCXXABI &getCXXABI() const { return *ABI; }
628 llvm::LLVMContext &getLLVMContext() { return VMContext; }
630 bool shouldUseTBAA() const { return TBAA != nullptr; }
632 const TargetCodeGenInfo &getTargetCodeGenInfo();
634 CodeGenTypes &getTypes() { return Types; }
636 CodeGenVTables &getVTables() { return VTables; }
638 ItaniumVTableContext &getItaniumVTableContext() {
639 return VTables.getItaniumVTableContext();
642 MicrosoftVTableContext &getMicrosoftVTableContext() {
643 return VTables.getMicrosoftVTableContext();
646 CtorList &getGlobalCtors() { return GlobalCtors; }
647 CtorList &getGlobalDtors() { return GlobalDtors; }
649 llvm::MDNode *getTBAAInfo(QualType QTy);
650 llvm::MDNode *getTBAAInfoForVTablePtr();
651 llvm::MDNode *getTBAAStructInfo(QualType QTy);
652 /// Return the path-aware tag for given base type, access node and offset.
653 llvm::MDNode *getTBAAStructTagInfo(QualType BaseTy, llvm::MDNode *AccessN,
656 bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor);
658 bool isPaddedAtomicType(QualType type);
659 bool isPaddedAtomicType(const AtomicType *type);
661 /// Decorate the instruction with a TBAA tag. For scalar TBAA, the tag
662 /// is the same as the type. For struct-path aware TBAA, the tag
663 /// is different from the type: base type, access type and offset.
664 /// When ConvertTypeToTag is true, we create a tag based on the scalar type.
665 void DecorateInstructionWithTBAA(llvm::Instruction *Inst,
666 llvm::MDNode *TBAAInfo,
667 bool ConvertTypeToTag = true);
669 /// Adds !invariant.barrier !tag to instruction
670 void DecorateInstructionWithInvariantGroup(llvm::Instruction *I,
671 const CXXRecordDecl *RD);
673 /// Emit the given number of characters as a value of type size_t.
674 llvm::ConstantInt *getSize(CharUnits numChars);
676 /// Set the visibility for the given LLVM GlobalValue.
677 void setGlobalVisibility(llvm::GlobalValue *GV, const NamedDecl *D) const;
679 /// Set the TLS mode for the given LLVM GlobalValue for the thread-local
680 /// variable declaration D.
681 void setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const;
683 static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V) {
685 case DefaultVisibility: return llvm::GlobalValue::DefaultVisibility;
686 case HiddenVisibility: return llvm::GlobalValue::HiddenVisibility;
687 case ProtectedVisibility: return llvm::GlobalValue::ProtectedVisibility;
689 llvm_unreachable("unknown visibility!");
692 llvm::Constant *GetAddrOfGlobal(GlobalDecl GD,
693 ForDefinition_t IsForDefinition
696 /// Will return a global variable of the given type. If a variable with a
697 /// different type already exists then a new variable with the right type
698 /// will be created and all uses of the old variable will be replaced with a
699 /// bitcast to the new variable.
700 llvm::GlobalVariable *
701 CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty,
702 llvm::GlobalValue::LinkageTypes Linkage);
705 CreateGlobalInitOrDestructFunction(llvm::FunctionType *ty, const Twine &name,
706 const CGFunctionInfo &FI,
707 SourceLocation Loc = SourceLocation(),
710 /// Return the address space of the underlying global variable for D, as
711 /// determined by its declaration. Normally this is the same as the address
712 /// space of D's type, but in CUDA, address spaces are associated with
713 /// declarations, not types.
714 unsigned GetGlobalVarAddressSpace(const VarDecl *D, unsigned AddrSpace);
716 /// Return the llvm::Constant for the address of the given global variable.
717 /// If Ty is non-null and if the global doesn't exist, then it will be created
718 /// with the specified type instead of whatever the normal requested type
719 /// would be. If IsForDefinition is true, it is guranteed that an actual
720 /// global with type Ty will be returned, not conversion of a variable with
721 /// the same mangled name but some other type.
722 llvm::Constant *GetAddrOfGlobalVar(const VarDecl *D,
723 llvm::Type *Ty = nullptr,
724 ForDefinition_t IsForDefinition
727 /// Return the address of the given function. If Ty is non-null, then this
728 /// function will use the specified type if it has to create it.
729 llvm::Constant *GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty = nullptr,
730 bool ForVTable = false,
731 bool DontDefer = false,
732 ForDefinition_t IsForDefinition
735 /// Get the address of the RTTI descriptor for the given type.
736 llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH = false);
738 /// Get the address of a uuid descriptor .
739 ConstantAddress GetAddrOfUuidDescriptor(const CXXUuidofExpr* E);
741 /// Get the address of the thunk for the given global decl.
742 llvm::Constant *GetAddrOfThunk(GlobalDecl GD, const ThunkInfo &Thunk);
744 /// Get a reference to the target of VD.
745 ConstantAddress GetWeakRefReference(const ValueDecl *VD);
747 /// Returns the assumed alignment of an opaque pointer to the given class.
748 CharUnits getClassPointerAlignment(const CXXRecordDecl *CD);
750 /// Returns the assumed alignment of a virtual base of a class.
751 CharUnits getVBaseAlignment(CharUnits DerivedAlign,
752 const CXXRecordDecl *Derived,
753 const CXXRecordDecl *VBase);
755 /// Given a class pointer with an actual known alignment, and the
756 /// expected alignment of an object at a dynamic offset w.r.t that
757 /// pointer, return the alignment to assume at the offset.
758 CharUnits getDynamicOffsetAlignment(CharUnits ActualAlign,
759 const CXXRecordDecl *Class,
760 CharUnits ExpectedTargetAlign);
763 computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass,
764 CastExpr::path_const_iterator Start,
765 CastExpr::path_const_iterator End);
767 /// Returns the offset from a derived class to a class. Returns null if the
770 GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
771 CastExpr::path_const_iterator PathBegin,
772 CastExpr::path_const_iterator PathEnd);
774 llvm::FoldingSet<BlockByrefHelpers> ByrefHelpersCache;
776 /// Fetches the global unique block count.
777 int getUniqueBlockCount() { return ++Block.GlobalUniqueCount; }
779 /// Fetches the type of a generic block descriptor.
780 llvm::Type *getBlockDescriptorType();
782 /// The type of a generic block literal.
783 llvm::Type *getGenericBlockLiteralType();
785 /// Gets the address of a block which requires no captures.
786 llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, StringRef Name);
788 /// Returns the address of a block which requires no caputres, or null if
789 /// we've yet to emit the block for BE.
790 llvm::Constant *getAddrOfGlobalBlockIfEmitted(const BlockExpr *BE) {
791 return EmittedGlobalBlocks.lookup(BE);
794 /// Notes that BE's global block is available via Addr. Asserts that BE
795 /// isn't already emitted.
796 void setAddrOfGlobalBlock(const BlockExpr *BE, llvm::Constant *Addr);
798 /// Return a pointer to a constant CFString object for the given string.
799 ConstantAddress GetAddrOfConstantCFString(const StringLiteral *Literal);
801 /// Return a pointer to a constant NSString object for the given string. Or a
802 /// user defined String object as defined via
803 /// -fconstant-string-class=class_name option.
804 ConstantAddress GetAddrOfConstantString(const StringLiteral *Literal);
806 /// Return a constant array for the given string.
807 llvm::Constant *GetConstantArrayFromStringLiteral(const StringLiteral *E);
809 /// Return a pointer to a constant array for the given string literal.
811 GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
812 StringRef Name = ".str");
814 /// Return a pointer to a constant array for the given ObjCEncodeExpr node.
816 GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
818 /// Returns a pointer to a character array containing the literal and a
819 /// terminating '\0' character. The result has pointer to array type.
821 /// \param GlobalName If provided, the name to use for the global (if one is
824 GetAddrOfConstantCString(const std::string &Str,
825 const char *GlobalName = nullptr);
827 /// Returns a pointer to a constant global variable for the given file-scope
828 /// compound literal expression.
829 ConstantAddress GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr*E);
831 /// If it's been emitted already, returns the GlobalVariable corresponding to
832 /// a compound literal. Otherwise, returns null.
833 llvm::GlobalVariable *
834 getAddrOfConstantCompoundLiteralIfEmitted(const CompoundLiteralExpr *E);
836 /// Notes that CLE's GlobalVariable is GV. Asserts that CLE isn't already
838 void setAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *CLE,
839 llvm::GlobalVariable *GV);
841 /// \brief Returns a pointer to a global variable representing a temporary
842 /// with static or thread storage duration.
843 ConstantAddress GetAddrOfGlobalTemporary(const MaterializeTemporaryExpr *E,
846 /// \brief Retrieve the record type that describes the state of an
847 /// Objective-C fast enumeration loop (for..in).
848 QualType getObjCFastEnumerationStateType();
850 // Produce code for this constructor/destructor. This method doesn't try
851 // to apply any ABI rules about which other constructors/destructors
852 // are needed or if they are alias to each other.
853 llvm::Function *codegenCXXStructor(const CXXMethodDecl *MD,
856 /// Return the address of the constructor/destructor of the given type.
858 getAddrOfCXXStructor(const CXXMethodDecl *MD, StructorType Type,
859 const CGFunctionInfo *FnInfo = nullptr,
860 llvm::FunctionType *FnType = nullptr,
861 bool DontDefer = false,
862 ForDefinition_t IsForDefinition = NotForDefinition);
864 /// Given a builtin id for a function like "__builtin_fabsf", return a
865 /// Function* for "fabsf".
866 llvm::Constant *getBuiltinLibFunction(const FunctionDecl *FD,
869 llvm::Function *getIntrinsic(unsigned IID, ArrayRef<llvm::Type*> Tys = None);
871 /// Emit code for a single top level declaration.
872 void EmitTopLevelDecl(Decl *D);
874 /// \brief Stored a deferred empty coverage mapping for an unused
875 /// and thus uninstrumented top level declaration.
876 void AddDeferredUnusedCoverageMapping(Decl *D);
878 /// \brief Remove the deferred empty coverage mapping as this
879 /// declaration is actually instrumented.
880 void ClearUnusedCoverageMapping(const Decl *D);
882 /// \brief Emit all the deferred coverage mappings
883 /// for the uninstrumented functions.
884 void EmitDeferredUnusedCoverageMappings();
886 /// Tell the consumer that this variable has been instantiated.
887 void HandleCXXStaticMemberVarInstantiation(VarDecl *VD);
889 /// \brief If the declaration has internal linkage but is inside an
890 /// extern "C" linkage specification, prepare to emit an alias for it
891 /// to the expected name.
892 template<typename SomeDecl>
893 void MaybeHandleStaticInExternC(const SomeDecl *D, llvm::GlobalValue *GV);
895 /// Add a global to a list to be added to the llvm.used metadata.
896 void addUsedGlobal(llvm::GlobalValue *GV);
898 /// Add a global to a list to be added to the llvm.compiler.used metadata.
899 void addCompilerUsedGlobal(llvm::GlobalValue *GV);
901 /// Add a destructor and object to add to the C++ global destructor function.
902 void AddCXXDtorEntry(llvm::Constant *DtorFn, llvm::Constant *Object) {
903 CXXGlobalDtors.emplace_back(DtorFn, Object);
906 /// Create a new runtime function with the specified type and name.
908 CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name,
909 llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
912 /// Create a new compiler builtin function with the specified type and name.
914 CreateBuiltinFunction(llvm::FunctionType *Ty, StringRef Name,
915 llvm::AttributeList ExtraAttrs = llvm::AttributeList());
916 /// Create a new runtime global variable with the specified type and name.
917 llvm::Constant *CreateRuntimeVariable(llvm::Type *Ty,
920 ///@name Custom Blocks Runtime Interfaces
923 llvm::Constant *getNSConcreteGlobalBlock();
924 llvm::Constant *getNSConcreteStackBlock();
925 llvm::Constant *getBlockObjectAssign();
926 llvm::Constant *getBlockObjectDispose();
930 llvm::Constant *getLLVMLifetimeStartFn();
931 llvm::Constant *getLLVMLifetimeEndFn();
933 // Make sure that this type is translated.
934 void UpdateCompletedType(const TagDecl *TD);
936 llvm::Constant *getMemberPointerConstant(const UnaryOperator *e);
938 /// Try to emit the initializer for the given declaration as a constant;
939 /// returns 0 if the expression cannot be emitted as a constant.
940 llvm::Constant *EmitConstantInit(const VarDecl &D,
941 CodeGenFunction *CGF = nullptr);
943 /// Try to emit the given expression as a constant; returns 0 if the
944 /// expression cannot be emitted as a constant.
945 llvm::Constant *EmitConstantExpr(const Expr *E, QualType DestType,
946 CodeGenFunction *CGF = nullptr);
948 /// Emit the given constant value as a constant, in the type's scalar
950 llvm::Constant *EmitConstantValue(const APValue &Value, QualType DestType,
951 CodeGenFunction *CGF = nullptr);
953 /// Emit the given constant value as a constant, in the type's memory
955 llvm::Constant *EmitConstantValueForMemory(const APValue &Value,
957 CodeGenFunction *CGF = nullptr);
959 /// \brief Emit type info if type of an expression is a variably modified
960 /// type. Also emit proper debug info for cast types.
961 void EmitExplicitCastExprType(const ExplicitCastExpr *E,
962 CodeGenFunction *CGF = nullptr);
964 /// Return the result of value-initializing the given type, i.e. a null
965 /// expression of the given type. This is usually, but not always, an LLVM
967 llvm::Constant *EmitNullConstant(QualType T);
969 /// Return a null constant appropriate for zero-initializing a base class with
970 /// the given type. This is usually, but not always, an LLVM null constant.
971 llvm::Constant *EmitNullConstantForBase(const CXXRecordDecl *Record);
973 /// Emit a general error that something can't be done.
974 void Error(SourceLocation loc, StringRef error);
976 /// Print out an error that codegen doesn't support the specified stmt yet.
977 void ErrorUnsupported(const Stmt *S, const char *Type);
979 /// Print out an error that codegen doesn't support the specified decl yet.
980 void ErrorUnsupported(const Decl *D, const char *Type);
982 /// Set the attributes on the LLVM function for the given decl and function
983 /// info. This applies attributes necessary for handling the ABI as well as
984 /// user specified attributes like section.
985 void SetInternalFunctionAttributes(const Decl *D, llvm::Function *F,
986 const CGFunctionInfo &FI);
988 /// Set the LLVM function attributes (sext, zext, etc).
989 void SetLLVMFunctionAttributes(const Decl *D,
990 const CGFunctionInfo &Info,
993 /// Set the LLVM function attributes which only apply to a function
995 void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F);
997 /// Return true iff the given type uses 'sret' when used as a return type.
998 bool ReturnTypeUsesSRet(const CGFunctionInfo &FI);
1000 /// Return true iff the given type uses an argument slot when 'sret' is used
1001 /// as a return type.
1002 bool ReturnSlotInterferesWithArgs(const CGFunctionInfo &FI);
1004 /// Return true iff the given type uses 'fpret' when used as a return type.
1005 bool ReturnTypeUsesFPRet(QualType ResultType);
1007 /// Return true iff the given type uses 'fp2ret' when used as a return type.
1008 bool ReturnTypeUsesFP2Ret(QualType ResultType);
1010 /// Get the LLVM attributes and calling convention to use for a particular
1013 /// \param Name - The function name.
1014 /// \param Info - The function type information.
1015 /// \param CalleeInfo - The callee information these attributes are being
1016 /// constructed for. If valid, the attributes applied to this decl may
1017 /// contribute to the function attributes and calling convention.
1018 /// \param Attrs [out] - On return, the attribute list to use.
1019 /// \param CallingConv [out] - On return, the LLVM calling convention to use.
1020 void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info,
1021 CGCalleeInfo CalleeInfo,
1022 llvm::AttributeList &Attrs, unsigned &CallingConv,
1023 bool AttrOnCallSite);
1025 /// Adds attributes to F according to our CodeGenOptions and LangOptions, as
1026 /// though we had emitted it ourselves. We remove any attributes on F that
1027 /// conflict with the attributes we add here.
1029 /// This is useful for adding attrs to bitcode modules that you want to link
1030 /// with but don't control, such as CUDA's libdevice. When linking with such
1031 /// a bitcode library, you might want to set e.g. its functions'
1032 /// "unsafe-fp-math" attribute to match the attr of the functions you're
1033 /// codegen'ing. Otherwise, LLVM will interpret the bitcode module's lack of
1034 /// unsafe-fp-math attrs as tantamount to unsafe-fp-math=false, and then LLVM
1035 /// will propagate unsafe-fp-math=false up to every transitive caller of a
1036 /// function in the bitcode library!
1038 /// With the exception of fast-math attrs, this will only make the attributes
1039 /// on the function more conservative. But it's unsafe to call this on a
1040 /// function which relies on particular fast-math attributes for correctness.
1041 /// It's up to you to ensure that this is safe.
1042 void AddDefaultFnAttrs(llvm::Function &F);
1044 // Fills in the supplied string map with the set of target features for the
1045 // passed in function.
1046 void getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
1047 const FunctionDecl *FD);
1049 StringRef getMangledName(GlobalDecl GD);
1050 StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
1052 void EmitTentativeDefinition(const VarDecl *D);
1054 void EmitVTable(CXXRecordDecl *Class);
1056 void RefreshTypeCacheForClass(const CXXRecordDecl *Class);
1058 /// \brief Appends Opts to the "Linker Options" metadata value.
1059 void AppendLinkerOptions(StringRef Opts);
1061 /// \brief Appends a detect mismatch command to the linker options.
1062 void AddDetectMismatch(StringRef Name, StringRef Value);
1064 /// \brief Appends a dependent lib to the "Linker Options" metadata value.
1065 void AddDependentLib(StringRef Lib);
1067 llvm::GlobalVariable::LinkageTypes getFunctionLinkage(GlobalDecl GD);
1069 void setFunctionLinkage(GlobalDecl GD, llvm::Function *F) {
1070 F->setLinkage(getFunctionLinkage(GD));
1073 /// Set the DLL storage class on F.
1074 void setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F);
1076 /// Return the appropriate linkage for the vtable, VTT, and type information
1077 /// of the given class.
1078 llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);
1080 /// Return the store size, in character units, of the given LLVM type.
1081 CharUnits GetTargetTypeStoreSize(llvm::Type *Ty) const;
1083 /// Returns LLVM linkage for a declarator.
1084 llvm::GlobalValue::LinkageTypes
1085 getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage,
1086 bool IsConstantVariable);
1088 /// Returns LLVM linkage for a declarator.
1089 llvm::GlobalValue::LinkageTypes
1090 getLLVMLinkageVarDefinition(const VarDecl *VD, bool IsConstant);
1092 /// Emit all the global annotations.
1093 void EmitGlobalAnnotations();
1095 /// Emit an annotation string.
1096 llvm::Constant *EmitAnnotationString(StringRef Str);
1098 /// Emit the annotation's translation unit.
1099 llvm::Constant *EmitAnnotationUnit(SourceLocation Loc);
1101 /// Emit the annotation line number.
1102 llvm::Constant *EmitAnnotationLineNo(SourceLocation L);
1104 /// Generate the llvm::ConstantStruct which contains the annotation
1105 /// information for a given GlobalValue. The annotation struct is
1106 /// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the
1107 /// GlobalValue being annotated. The second field is the constant string
1108 /// created from the AnnotateAttr's annotation. The third field is a constant
1109 /// string containing the name of the translation unit. The fourth field is
1110 /// the line number in the file of the annotated value declaration.
1111 llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
1112 const AnnotateAttr *AA,
1115 /// Add global annotations that are set on D, for the global GV. Those
1116 /// annotations are emitted during finalization of the LLVM code.
1117 void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV);
1119 bool isInSanitizerBlacklist(llvm::Function *Fn, SourceLocation Loc) const;
1121 bool isInSanitizerBlacklist(llvm::GlobalVariable *GV, SourceLocation Loc,
1123 StringRef Category = StringRef()) const;
1125 /// Imbue XRay attributes to a function, applying the always/never attribute
1126 /// lists in the process. Returns true if we did imbue attributes this way,
1127 /// false otherwise.
1128 bool imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
1129 StringRef Category = StringRef()) const;
1131 SanitizerMetadata *getSanitizerMetadata() {
1132 return SanitizerMD.get();
1135 void addDeferredVTable(const CXXRecordDecl *RD) {
1136 DeferredVTables.push_back(RD);
1139 /// Emit code for a singal global function or var decl. Forward declarations
1140 /// are emitted lazily.
1141 void EmitGlobal(GlobalDecl D);
1143 bool TryEmitDefinitionAsAlias(GlobalDecl Alias, GlobalDecl Target,
1145 bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
1147 /// Set attributes for a global definition.
1148 void setFunctionDefinitionAttributes(const FunctionDecl *D,
1151 llvm::GlobalValue *GetGlobalValue(StringRef Ref);
1153 /// Set attributes which are common to any form of a global definition (alias,
1154 /// Objective-C method, function, global variable).
1156 /// NOTE: This should only be called for definitions.
1157 void SetCommonAttributes(const Decl *D, llvm::GlobalValue *GV);
1159 /// Set attributes which must be preserved by an alias. This includes common
1160 /// attributes (i.e. it includes a call to SetCommonAttributes).
1162 /// NOTE: This should only be called for definitions.
1163 void setAliasAttributes(const Decl *D, llvm::GlobalValue *GV);
1165 void addReplacement(StringRef Name, llvm::Constant *C);
1167 void addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C);
1169 /// \brief Emit a code for threadprivate directive.
1170 /// \param D Threadprivate declaration.
1171 void EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D);
1173 /// \brief Emit a code for declare reduction construct.
1174 void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
1175 CodeGenFunction *CGF = nullptr);
1177 /// Returns whether the given record has hidden LTO visibility and therefore
1178 /// may participate in (single-module) CFI and whole-program vtable
1180 bool HasHiddenLTOVisibility(const CXXRecordDecl *RD);
1182 /// Emit type metadata for the given vtable using the given layout.
1183 void EmitVTableTypeMetadata(llvm::GlobalVariable *VTable,
1184 const VTableLayout &VTLayout);
1186 /// Generate a cross-DSO type identifier for MD.
1187 llvm::ConstantInt *CreateCrossDsoCfiTypeId(llvm::Metadata *MD);
1189 /// Create a metadata identifier for the given type. This may either be an
1190 /// MDString (for external identifiers) or a distinct unnamed MDNode (for
1191 /// internal identifiers).
1192 llvm::Metadata *CreateMetadataIdentifierForType(QualType T);
1194 /// Create and attach type metadata to the given function.
1195 void CreateFunctionTypeMetadata(const FunctionDecl *FD, llvm::Function *F);
1197 /// Returns whether this module needs the "all-vtables" type identifier.
1198 bool NeedAllVtablesTypeId() const;
1200 /// Create and attach type metadata for the given vtable.
1201 void AddVTableTypeMetadata(llvm::GlobalVariable *VTable, CharUnits Offset,
1202 const CXXRecordDecl *RD);
1204 /// \brief Get the declaration of std::terminate for the platform.
1205 llvm::Constant *getTerminateFn();
1207 llvm::SanitizerStatReport &getSanStats();
1210 createOpenCLIntToSamplerConversion(const Expr *E, CodeGenFunction &CGF);
1212 /// Get target specific null pointer.
1213 /// \param T is the LLVM type of the null pointer.
1214 /// \param QT is the clang QualType of the null pointer.
1215 llvm::Constant *getNullPointer(llvm::PointerType *T, QualType QT);
1218 llvm::Constant *GetOrCreateLLVMFunction(
1219 StringRef MangledName, llvm::Type *Ty, GlobalDecl D, bool ForVTable,
1220 bool DontDefer = false, bool IsThunk = false,
1221 llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
1222 ForDefinition_t IsForDefinition = NotForDefinition);
1224 llvm::Constant *GetOrCreateLLVMGlobal(StringRef MangledName,
1225 llvm::PointerType *PTy,
1227 ForDefinition_t IsForDefinition
1228 = NotForDefinition);
1230 void setNonAliasAttributes(const Decl *D, llvm::GlobalObject *GO);
1232 /// Set function attributes for a function declaration.
1233 void SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1234 bool IsIncompleteFunction, bool IsThunk);
1236 void EmitGlobalDefinition(GlobalDecl D, llvm::GlobalValue *GV = nullptr);
1238 void EmitGlobalFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
1239 void EmitGlobalVarDefinition(const VarDecl *D, bool IsTentative = false);
1240 void EmitAliasDefinition(GlobalDecl GD);
1241 void emitIFuncDefinition(GlobalDecl GD);
1242 void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
1243 void EmitObjCIvarInitializations(ObjCImplementationDecl *D);
1245 // C++ related functions.
1247 void EmitDeclContext(const DeclContext *DC);
1248 void EmitLinkageSpec(const LinkageSpecDecl *D);
1250 /// \brief Emit the function that initializes C++ thread_local variables.
1251 void EmitCXXThreadLocalInitFunc();
1253 /// Emit the function that initializes C++ globals.
1254 void EmitCXXGlobalInitFunc();
1256 /// Emit the function that destroys C++ globals.
1257 void EmitCXXGlobalDtorFunc();
1259 /// Emit the function that initializes the specified global (if PerformInit is
1260 /// true) and registers its destructor.
1261 void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
1262 llvm::GlobalVariable *Addr,
1265 void EmitPointerToInitFunc(const VarDecl *VD, llvm::GlobalVariable *Addr,
1266 llvm::Function *InitFunc, InitSegAttr *ISA);
1268 // FIXME: Hardcoding priority here is gross.
1269 void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
1270 llvm::Constant *AssociatedData = nullptr);
1271 void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535);
1273 /// EmitCtorList - Generates a global array of functions and priorities using
1274 /// the given list and name. This array will have appending linkage and is
1275 /// suitable for use as a LLVM constructor or destructor array. Clears Fns.
1276 void EmitCtorList(CtorList &Fns, const char *GlobalName);
1278 /// Emit any needed decls for which code generation was deferred.
1279 void EmitDeferred();
1281 /// Call replaceAllUsesWith on all pairs in Replacements.
1282 void applyReplacements();
1284 /// Call replaceAllUsesWith on all pairs in GlobalValReplacements.
1285 void applyGlobalValReplacements();
1287 void checkAliases();
1289 /// Emit any vtables which we deferred and still have a use for.
1290 void EmitDeferredVTables();
1292 /// Emit a dummy function that reference a CoreFoundation symbol when
1293 /// @available is used on Darwin.
1294 void emitAtAvailableLinkGuard();
1296 /// Emit the llvm.used and llvm.compiler.used metadata.
1297 void emitLLVMUsed();
1299 /// \brief Emit the link options introduced by imported modules.
1300 void EmitModuleLinkOptions();
1302 /// \brief Emit aliases for internal-linkage declarations inside "C" language
1303 /// linkage specifications, giving them the "expected" name where possible.
1304 void EmitStaticExternCAliases();
1306 void EmitDeclMetadata();
1308 /// \brief Emit the Clang version as llvm.ident metadata.
1309 void EmitVersionIdentMetadata();
1311 /// Emits target specific Metadata for global declarations.
1312 void EmitTargetMetadata();
1314 /// Emit the llvm.gcov metadata used to tell LLVM where to emit the .gcno and
1315 /// .gcda files in a way that persists in .bc files.
1316 void EmitCoverageFile();
1318 /// Emits the initializer for a uuidof string.
1319 llvm::Constant *EmitUuidofInitializer(StringRef uuidstr);
1321 /// Determine whether the definition must be emitted; if this returns \c
1322 /// false, the definition can be emitted lazily if it's used.
1323 bool MustBeEmitted(const ValueDecl *D);
1325 /// Determine whether the definition can be emitted eagerly, or should be
1326 /// delayed until the end of the translation unit. This is relevant for
1327 /// definitions whose linkage can change, e.g. implicit function instantions
1328 /// which may later be explicitly instantiated.
1329 bool MayBeEmittedEagerly(const ValueDecl *D);
1331 /// Check whether we can use a "simpler", more core exceptions personality
1333 void SimplifyPersonality();
1335 /// Helper function for ConstructAttributeList and AddDefaultFnAttrs.
1336 /// Constructs an AttrList for a function with the given properties.
1337 void ConstructDefaultFnAttrList(StringRef Name, bool HasOptnone,
1338 bool AttrOnCallSite,
1339 llvm::AttrBuilder &FuncAttrs);
1341 } // end namespace CodeGen
1342 } // end namespace clang
1344 #endif // LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H