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/GlobalDecl.h"
25 #include "clang/AST/Mangle.h"
26 #include "clang/Basic/ABI.h"
27 #include "clang/Basic/LangOptions.h"
28 #include "clang/Basic/Module.h"
29 #include "clang/Basic/SanitizerBlacklist.h"
30 #include "llvm/ADT/DenseMap.h"
31 #include "llvm/ADT/SetVector.h"
32 #include "llvm/ADT/SmallPtrSet.h"
33 #include "llvm/ADT/StringMap.h"
34 #include "llvm/IR/Module.h"
35 #include "llvm/IR/ValueHandle.h"
36 #include "llvm/Transforms/Utils/SanitizerStats.h"
47 class IndexedInstrProfReader;
51 class TargetCodeGenInfo;
57 class ObjCImplementationDecl;
58 class ObjCCategoryImplDecl;
59 class ObjCProtocolDecl;
73 class HeaderSearchOptions;
74 class PreprocessorOptions;
75 class DiagnosticsEngine;
77 class CXXDestructorDecl;
79 class CoverageSourceInfo;
84 class CodeGenFunction;
89 class CGOpenCLRuntime;
90 class CGOpenMPRuntime;
92 class BlockFieldFlags;
93 class FunctionArgList;
94 class CoverageMappingModuleGen;
96 struct OrderGlobalInits {
97 unsigned int priority;
98 unsigned int lex_order;
99 OrderGlobalInits(unsigned int p, unsigned int l)
100 : priority(p), lex_order(l) {}
102 bool operator==(const OrderGlobalInits &RHS) const {
103 return priority == RHS.priority && lex_order == RHS.lex_order;
106 bool operator<(const OrderGlobalInits &RHS) const {
107 return std::tie(priority, lex_order) <
108 std::tie(RHS.priority, RHS.lex_order);
112 struct ObjCEntrypoints {
113 ObjCEntrypoints() { memset(this, 0, sizeof(*this)); }
115 /// void objc_autoreleasePoolPop(void*);
116 llvm::Constant *objc_autoreleasePoolPop;
118 /// void *objc_autoreleasePoolPush(void);
119 llvm::Constant *objc_autoreleasePoolPush;
121 /// id objc_autorelease(id);
122 llvm::Constant *objc_autorelease;
124 /// id objc_autoreleaseReturnValue(id);
125 llvm::Constant *objc_autoreleaseReturnValue;
127 /// void objc_copyWeak(id *dest, id *src);
128 llvm::Constant *objc_copyWeak;
130 /// void objc_destroyWeak(id*);
131 llvm::Constant *objc_destroyWeak;
133 /// id objc_initWeak(id*, id);
134 llvm::Constant *objc_initWeak;
136 /// id objc_loadWeak(id*);
137 llvm::Constant *objc_loadWeak;
139 /// id objc_loadWeakRetained(id*);
140 llvm::Constant *objc_loadWeakRetained;
142 /// void objc_moveWeak(id *dest, id *src);
143 llvm::Constant *objc_moveWeak;
145 /// id objc_retain(id);
146 llvm::Constant *objc_retain;
148 /// id objc_retainAutorelease(id);
149 llvm::Constant *objc_retainAutorelease;
151 /// id objc_retainAutoreleaseReturnValue(id);
152 llvm::Constant *objc_retainAutoreleaseReturnValue;
154 /// id objc_retainAutoreleasedReturnValue(id);
155 llvm::Constant *objc_retainAutoreleasedReturnValue;
157 /// id objc_retainBlock(id);
158 llvm::Constant *objc_retainBlock;
160 /// void objc_release(id);
161 llvm::Constant *objc_release;
163 /// id objc_storeStrong(id*, id);
164 llvm::Constant *objc_storeStrong;
166 /// id objc_storeWeak(id*, id);
167 llvm::Constant *objc_storeWeak;
169 /// id objc_unsafeClaimAutoreleasedReturnValue(id);
170 llvm::Constant *objc_unsafeClaimAutoreleasedReturnValue;
172 /// A void(void) inline asm to use to mark that the return value of
173 /// a call will be immediately retain.
174 llvm::InlineAsm *retainAutoreleasedReturnValueMarker;
176 /// void clang.arc.use(...);
177 llvm::Constant *clang_arc_use;
180 /// This class records statistics on instrumentation based profiling.
181 class InstrProfStats {
182 uint32_t VisitedInMainFile;
183 uint32_t MissingInMainFile;
190 : VisitedInMainFile(0), MissingInMainFile(0), Visited(0), Missing(0),
192 /// Record that we've visited a function and whether or not that function was
193 /// in the main source file.
194 void addVisited(bool MainFile) {
199 /// Record that a function we've visited has no profile data.
200 void addMissing(bool MainFile) {
205 /// Record that a function we've visited has mismatched profile data.
206 void addMismatched(bool MainFile) { ++Mismatched; }
207 /// Whether or not the stats we've gathered indicate any potential problems.
208 bool hasDiagnostics() { return Missing || Mismatched; }
209 /// Report potential problems we've found to \c Diags.
210 void reportDiagnostics(DiagnosticsEngine &Diags, StringRef MainFile);
213 /// A pair of helper functions for a __block variable.
214 class BlockByrefHelpers : public llvm::FoldingSetNode {
215 // MSVC requires this type to be complete in order to process this
218 llvm::Constant *CopyHelper;
219 llvm::Constant *DisposeHelper;
221 /// The alignment of the field. This is important because
222 /// different offsets to the field within the byref struct need to
223 /// have different helper functions.
226 BlockByrefHelpers(CharUnits alignment) : Alignment(alignment) {}
227 BlockByrefHelpers(const BlockByrefHelpers &) = default;
228 virtual ~BlockByrefHelpers();
230 void Profile(llvm::FoldingSetNodeID &id) const {
231 id.AddInteger(Alignment.getQuantity());
234 virtual void profileImpl(llvm::FoldingSetNodeID &id) const = 0;
236 virtual bool needsCopy() const { return true; }
237 virtual void emitCopy(CodeGenFunction &CGF, Address dest, Address src) = 0;
239 virtual bool needsDispose() const { return true; }
240 virtual void emitDispose(CodeGenFunction &CGF, Address field) = 0;
243 /// This class organizes the cross-function state that is used while generating
245 class CodeGenModule : public CodeGenTypeCache {
246 CodeGenModule(const CodeGenModule &) = delete;
247 void operator=(const CodeGenModule &) = delete;
251 Structor() : Priority(0), Initializer(nullptr), AssociatedData(nullptr) {}
252 Structor(int Priority, llvm::Constant *Initializer,
253 llvm::Constant *AssociatedData)
254 : Priority(Priority), Initializer(Initializer),
255 AssociatedData(AssociatedData) {}
257 llvm::Constant *Initializer;
258 llvm::Constant *AssociatedData;
261 typedef std::vector<Structor> CtorList;
265 const LangOptions &LangOpts;
266 const HeaderSearchOptions &HeaderSearchOpts; // Only used for debug info.
267 const PreprocessorOptions &PreprocessorOpts; // Only used for debug info.
268 const CodeGenOptions &CodeGenOpts;
269 llvm::Module &TheModule;
270 DiagnosticsEngine &Diags;
271 const TargetInfo &Target;
272 std::unique_ptr<CGCXXABI> ABI;
273 llvm::LLVMContext &VMContext;
277 mutable const TargetCodeGenInfo *TheTargetCodeGenInfo;
279 // This should not be moved earlier, since its initialization depends on some
280 // of the previous reference members being already initialized and also checks
281 // if TheTargetCodeGenInfo is NULL
284 /// Holds information about C++ vtables.
285 CodeGenVTables VTables;
287 CGObjCRuntime* ObjCRuntime;
288 CGOpenCLRuntime* OpenCLRuntime;
289 CGOpenMPRuntime* OpenMPRuntime;
290 CGCUDARuntime* CUDARuntime;
291 CGDebugInfo* DebugInfo;
292 ObjCEntrypoints *ObjCData;
293 llvm::MDNode *NoObjCARCExceptionsMetadata;
294 std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader;
295 InstrProfStats PGOStats;
296 std::unique_ptr<llvm::SanitizerStatReport> SanStats;
298 // A set of references that have only been seen via a weakref so far. This is
299 // used to remove the weak of the reference if we ever see a direct reference
301 llvm::SmallPtrSet<llvm::GlobalValue*, 10> WeakRefReferences;
303 /// This contains all the decls which have definitions but/ which are deferred
304 /// for emission and therefore should only be output if they are actually
305 /// used. If a decl is in this, then it is known to have not been referenced
307 std::map<StringRef, GlobalDecl> DeferredDecls;
309 /// This is a list of deferred decls which we have seen that *are* actually
310 /// referenced. These get code generated when the module is done.
311 struct DeferredGlobal {
312 DeferredGlobal(llvm::GlobalValue *GV, GlobalDecl GD) : GV(GV), GD(GD) {}
313 llvm::TrackingVH<llvm::GlobalValue> GV;
316 std::vector<DeferredGlobal> DeferredDeclsToEmit;
317 void addDeferredDeclToEmit(llvm::GlobalValue *GV, GlobalDecl GD) {
318 DeferredDeclsToEmit.emplace_back(GV, GD);
321 /// List of alias we have emitted. Used to make sure that what they point to
322 /// is defined once we get to the end of the of the translation unit.
323 std::vector<GlobalDecl> Aliases;
325 typedef llvm::StringMap<llvm::TrackingVH<llvm::Constant> > ReplacementsTy;
326 ReplacementsTy Replacements;
328 /// List of global values to be replaced with something else. Used when we
329 /// want to replace a GlobalValue but can't identify it by its mangled name
330 /// anymore (because the name is already taken).
331 llvm::SmallVector<std::pair<llvm::GlobalValue *, llvm::Constant *>, 8>
332 GlobalValReplacements;
334 /// Set of global decls for which we already diagnosed mangled name conflict.
335 /// Required to not issue a warning (on a mangling conflict) multiple times
336 /// for the same decl.
337 llvm::DenseSet<GlobalDecl> DiagnosedConflictingDefinitions;
339 /// A queue of (optional) vtables to consider emitting.
340 std::vector<const CXXRecordDecl*> DeferredVTables;
342 /// List of global values which are required to be present in the object file;
343 /// bitcast to i8*. This is used for forcing visibility of symbols which may
344 /// otherwise be optimized out.
345 std::vector<llvm::WeakVH> LLVMUsed;
346 std::vector<llvm::WeakVH> LLVMCompilerUsed;
348 /// Store the list of global constructors and their respective priorities to
349 /// be emitted when the translation unit is complete.
350 CtorList GlobalCtors;
352 /// Store the list of global destructors and their respective priorities to be
353 /// emitted when the translation unit is complete.
354 CtorList GlobalDtors;
356 /// An ordered map of canonical GlobalDecls to their mangled names.
357 llvm::MapVector<GlobalDecl, StringRef> MangledDeclNames;
358 llvm::StringMap<GlobalDecl, llvm::BumpPtrAllocator> Manglings;
360 /// Global annotations.
361 std::vector<llvm::Constant*> Annotations;
363 /// Map used to get unique annotation strings.
364 llvm::StringMap<llvm::Constant*> AnnotationStrings;
366 llvm::StringMap<llvm::GlobalVariable *> CFConstantStringMap;
368 llvm::DenseMap<llvm::Constant *, llvm::GlobalVariable *> ConstantStringMap;
369 llvm::DenseMap<const Decl*, llvm::Constant *> StaticLocalDeclMap;
370 llvm::DenseMap<const Decl*, llvm::GlobalVariable*> StaticLocalDeclGuardMap;
371 llvm::DenseMap<const Expr*, llvm::Constant *> MaterializedGlobalTemporaryMap;
373 llvm::DenseMap<QualType, llvm::Constant *> AtomicSetterHelperFnMap;
374 llvm::DenseMap<QualType, llvm::Constant *> AtomicGetterHelperFnMap;
376 /// Map used to get unique type descriptor constants for sanitizers.
377 llvm::DenseMap<QualType, llvm::Constant *> TypeDescriptorMap;
379 /// Map used to track internal linkage functions declared within
380 /// extern "C" regions.
381 typedef llvm::MapVector<IdentifierInfo *,
382 llvm::GlobalValue *> StaticExternCMap;
383 StaticExternCMap StaticExternCValues;
385 /// \brief thread_local variables defined or used in this TU.
386 std::vector<const VarDecl *> CXXThreadLocals;
388 /// \brief thread_local variables with initializers that need to run
389 /// before any thread_local variable in this TU is odr-used.
390 std::vector<llvm::Function *> CXXThreadLocalInits;
391 std::vector<const VarDecl *> CXXThreadLocalInitVars;
393 /// Global variables with initializers that need to run before main.
394 std::vector<llvm::Function *> CXXGlobalInits;
396 /// When a C++ decl with an initializer is deferred, null is
397 /// appended to CXXGlobalInits, and the index of that null is placed
398 /// here so that the initializer will be performed in the correct
399 /// order. Once the decl is emitted, the index is replaced with ~0U to ensure
400 /// that we don't re-emit the initializer.
401 llvm::DenseMap<const Decl*, unsigned> DelayedCXXInitPosition;
403 typedef std::pair<OrderGlobalInits, llvm::Function*> GlobalInitData;
405 struct GlobalInitPriorityCmp {
406 bool operator()(const GlobalInitData &LHS,
407 const GlobalInitData &RHS) const {
408 return LHS.first.priority < RHS.first.priority;
412 /// Global variables with initializers whose order of initialization is set by
413 /// init_priority attribute.
414 SmallVector<GlobalInitData, 8> PrioritizedCXXGlobalInits;
416 /// Global destructor functions and arguments that need to run on termination.
417 std::vector<std::pair<llvm::WeakVH,llvm::Constant*> > CXXGlobalDtors;
419 /// \brief The complete set of modules that has been imported.
420 llvm::SetVector<clang::Module *> ImportedModules;
422 /// \brief A vector of metadata strings.
423 SmallVector<llvm::Metadata *, 16> LinkerOptionsMetadata;
425 /// @name Cache for Objective-C runtime types
428 /// Cached reference to the class for constant strings. This value has type
429 /// int * but is actually an Obj-C class pointer.
430 llvm::WeakVH CFConstantStringClassRef;
432 /// Cached reference to the class for constant strings. This value has type
433 /// int * but is actually an Obj-C class pointer.
434 llvm::WeakVH ConstantStringClassRef;
436 /// \brief The LLVM type corresponding to NSConstantString.
437 llvm::StructType *NSConstantStringType;
439 /// \brief The type used to describe the state of a fast enumeration in
440 /// Objective-C's for..in loop.
441 QualType ObjCFastEnumerationStateType;
445 /// Lazily create the Objective-C runtime
446 void createObjCRuntime();
448 void createOpenCLRuntime();
449 void createOpenMPRuntime();
450 void createCUDARuntime();
452 bool isTriviallyRecursive(const FunctionDecl *F);
453 bool shouldEmitFunction(GlobalDecl GD);
455 /// @name Cache for Blocks Runtime Globals
458 llvm::Constant *NSConcreteGlobalBlock;
459 llvm::Constant *NSConcreteStackBlock;
461 llvm::Constant *BlockObjectAssign;
462 llvm::Constant *BlockObjectDispose;
464 llvm::Type *BlockDescriptorType;
465 llvm::Type *GenericBlockLiteralType;
468 int GlobalUniqueCount;
471 /// void @llvm.lifetime.start(i64 %size, i8* nocapture <ptr>)
472 llvm::Constant *LifetimeStartFn;
474 /// void @llvm.lifetime.end(i64 %size, i8* nocapture <ptr>)
475 llvm::Constant *LifetimeEndFn;
477 GlobalDecl initializedGlobalDecl;
479 std::unique_ptr<SanitizerMetadata> SanitizerMD;
483 llvm::DenseMap<const Decl *, bool> DeferredEmptyCoverageMappingDecls;
485 std::unique_ptr<CoverageMappingModuleGen> CoverageMapping;
487 /// Mapping from canonical types to their metadata identifiers. We need to
488 /// maintain this mapping because identifiers may be formed from distinct
490 llvm::DenseMap<QualType, llvm::Metadata *> MetadataIdMap;
493 CodeGenModule(ASTContext &C, const HeaderSearchOptions &headersearchopts,
494 const PreprocessorOptions &ppopts,
495 const CodeGenOptions &CodeGenOpts, llvm::Module &M,
496 DiagnosticsEngine &Diags,
497 CoverageSourceInfo *CoverageInfo = nullptr);
503 /// Finalize LLVM code generation.
506 /// Return a reference to the configured Objective-C runtime.
507 CGObjCRuntime &getObjCRuntime() {
508 if (!ObjCRuntime) createObjCRuntime();
512 /// Return true iff an Objective-C runtime has been configured.
513 bool hasObjCRuntime() { return !!ObjCRuntime; }
515 /// Return a reference to the configured OpenCL runtime.
516 CGOpenCLRuntime &getOpenCLRuntime() {
517 assert(OpenCLRuntime != nullptr);
518 return *OpenCLRuntime;
521 /// Return a reference to the configured OpenMP runtime.
522 CGOpenMPRuntime &getOpenMPRuntime() {
523 assert(OpenMPRuntime != nullptr);
524 return *OpenMPRuntime;
527 /// Return a reference to the configured CUDA runtime.
528 CGCUDARuntime &getCUDARuntime() {
529 assert(CUDARuntime != nullptr);
533 ObjCEntrypoints &getObjCEntrypoints() const {
534 assert(ObjCData != nullptr);
538 InstrProfStats &getPGOStats() { return PGOStats; }
539 llvm::IndexedInstrProfReader *getPGOReader() const { return PGOReader.get(); }
541 CoverageMappingModuleGen *getCoverageMapping() const {
542 return CoverageMapping.get();
545 llvm::Constant *getStaticLocalDeclAddress(const VarDecl *D) {
546 return StaticLocalDeclMap[D];
548 void setStaticLocalDeclAddress(const VarDecl *D,
550 StaticLocalDeclMap[D] = C;
554 getOrCreateStaticVarDecl(const VarDecl &D,
555 llvm::GlobalValue::LinkageTypes Linkage);
557 llvm::GlobalVariable *getStaticLocalDeclGuardAddress(const VarDecl *D) {
558 return StaticLocalDeclGuardMap[D];
560 void setStaticLocalDeclGuardAddress(const VarDecl *D,
561 llvm::GlobalVariable *C) {
562 StaticLocalDeclGuardMap[D] = C;
565 bool lookupRepresentativeDecl(StringRef MangledName,
566 GlobalDecl &Result) const;
568 llvm::Constant *getAtomicSetterHelperFnMap(QualType Ty) {
569 return AtomicSetterHelperFnMap[Ty];
571 void setAtomicSetterHelperFnMap(QualType Ty,
572 llvm::Constant *Fn) {
573 AtomicSetterHelperFnMap[Ty] = Fn;
576 llvm::Constant *getAtomicGetterHelperFnMap(QualType Ty) {
577 return AtomicGetterHelperFnMap[Ty];
579 void setAtomicGetterHelperFnMap(QualType Ty,
580 llvm::Constant *Fn) {
581 AtomicGetterHelperFnMap[Ty] = Fn;
584 llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
585 return TypeDescriptorMap[Ty];
587 void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
588 TypeDescriptorMap[Ty] = C;
591 CGDebugInfo *getModuleDebugInfo() { return DebugInfo; }
593 llvm::MDNode *getNoObjCARCExceptionsMetadata() {
594 if (!NoObjCARCExceptionsMetadata)
595 NoObjCARCExceptionsMetadata = llvm::MDNode::get(getLLVMContext(), None);
596 return NoObjCARCExceptionsMetadata;
599 ASTContext &getContext() const { return Context; }
600 const LangOptions &getLangOpts() const { return LangOpts; }
601 const HeaderSearchOptions &getHeaderSearchOpts()
602 const { return HeaderSearchOpts; }
603 const PreprocessorOptions &getPreprocessorOpts()
604 const { return PreprocessorOpts; }
605 const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
606 llvm::Module &getModule() const { return TheModule; }
607 DiagnosticsEngine &getDiags() const { return Diags; }
608 const llvm::DataLayout &getDataLayout() const {
609 return TheModule.getDataLayout();
611 const TargetInfo &getTarget() const { return Target; }
612 const llvm::Triple &getTriple() const;
613 bool supportsCOMDAT() const;
614 void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO);
616 CGCXXABI &getCXXABI() const { return *ABI; }
617 llvm::LLVMContext &getLLVMContext() { return VMContext; }
619 bool shouldUseTBAA() const { return TBAA != nullptr; }
621 const TargetCodeGenInfo &getTargetCodeGenInfo();
623 CodeGenTypes &getTypes() { return Types; }
625 CodeGenVTables &getVTables() { return VTables; }
627 ItaniumVTableContext &getItaniumVTableContext() {
628 return VTables.getItaniumVTableContext();
631 MicrosoftVTableContext &getMicrosoftVTableContext() {
632 return VTables.getMicrosoftVTableContext();
635 CtorList &getGlobalCtors() { return GlobalCtors; }
636 CtorList &getGlobalDtors() { return GlobalDtors; }
638 llvm::MDNode *getTBAAInfo(QualType QTy);
639 llvm::MDNode *getTBAAInfoForVTablePtr();
640 llvm::MDNode *getTBAAStructInfo(QualType QTy);
641 /// Return the path-aware tag for given base type, access node and offset.
642 llvm::MDNode *getTBAAStructTagInfo(QualType BaseTy, llvm::MDNode *AccessN,
645 bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor);
647 bool isPaddedAtomicType(QualType type);
648 bool isPaddedAtomicType(const AtomicType *type);
650 /// Decorate the instruction with a TBAA tag. For scalar TBAA, the tag
651 /// is the same as the type. For struct-path aware TBAA, the tag
652 /// is different from the type: base type, access type and offset.
653 /// When ConvertTypeToTag is true, we create a tag based on the scalar type.
654 void DecorateInstructionWithTBAA(llvm::Instruction *Inst,
655 llvm::MDNode *TBAAInfo,
656 bool ConvertTypeToTag = true);
658 /// Adds !invariant.barrier !tag to instruction
659 void DecorateInstructionWithInvariantGroup(llvm::Instruction *I,
660 const CXXRecordDecl *RD);
662 /// Emit the given number of characters as a value of type size_t.
663 llvm::ConstantInt *getSize(CharUnits numChars);
665 /// Set the visibility for the given LLVM GlobalValue.
666 void setGlobalVisibility(llvm::GlobalValue *GV, const NamedDecl *D) const;
668 /// Set the TLS mode for the given LLVM GlobalValue for the thread-local
669 /// variable declaration D.
670 void setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const;
672 static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V) {
674 case DefaultVisibility: return llvm::GlobalValue::DefaultVisibility;
675 case HiddenVisibility: return llvm::GlobalValue::HiddenVisibility;
676 case ProtectedVisibility: return llvm::GlobalValue::ProtectedVisibility;
678 llvm_unreachable("unknown visibility!");
681 llvm::Constant *GetAddrOfGlobal(GlobalDecl GD, bool IsForDefinition = false);
683 /// Will return a global variable of the given type. If a variable with a
684 /// different type already exists then a new variable with the right type
685 /// will be created and all uses of the old variable will be replaced with a
686 /// bitcast to the new variable.
687 llvm::GlobalVariable *
688 CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty,
689 llvm::GlobalValue::LinkageTypes Linkage);
692 CreateGlobalInitOrDestructFunction(llvm::FunctionType *ty, const Twine &name,
693 const CGFunctionInfo &FI,
694 SourceLocation Loc = SourceLocation(),
697 /// Return the address space of the underlying global variable for D, as
698 /// determined by its declaration. Normally this is the same as the address
699 /// space of D's type, but in CUDA, address spaces are associated with
700 /// declarations, not types.
701 unsigned GetGlobalVarAddressSpace(const VarDecl *D, unsigned AddrSpace);
703 /// Return the llvm::Constant for the address of the given global variable.
704 /// If Ty is non-null and if the global doesn't exist, then it will be created
705 /// with the specified type instead of whatever the normal requested type
706 /// would be. If IsForDefinition is true, it is guranteed that an actual
707 /// global with type Ty will be returned, not conversion of a variable with
708 /// the same mangled name but some other type.
709 llvm::Constant *GetAddrOfGlobalVar(const VarDecl *D,
710 llvm::Type *Ty = nullptr,
711 bool IsForDefinition = false);
713 /// Return the address of the given function. If Ty is non-null, then this
714 /// function will use the specified type if it has to create it.
715 llvm::Constant *GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty = nullptr,
716 bool ForVTable = false,
717 bool DontDefer = false,
718 bool IsForDefinition = false);
720 /// Get the address of the RTTI descriptor for the given type.
721 llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH = false);
723 /// Get the address of a uuid descriptor .
724 ConstantAddress GetAddrOfUuidDescriptor(const CXXUuidofExpr* E);
726 /// Get the address of the thunk for the given global decl.
727 llvm::Constant *GetAddrOfThunk(GlobalDecl GD, const ThunkInfo &Thunk);
729 /// Get a reference to the target of VD.
730 ConstantAddress GetWeakRefReference(const ValueDecl *VD);
732 /// Returns the assumed alignment of an opaque pointer to the given class.
733 CharUnits getClassPointerAlignment(const CXXRecordDecl *CD);
735 /// Returns the assumed alignment of a virtual base of a class.
736 CharUnits getVBaseAlignment(CharUnits DerivedAlign,
737 const CXXRecordDecl *Derived,
738 const CXXRecordDecl *VBase);
740 /// Given a class pointer with an actual known alignment, and the
741 /// expected alignment of an object at a dynamic offset w.r.t that
742 /// pointer, return the alignment to assume at the offset.
743 CharUnits getDynamicOffsetAlignment(CharUnits ActualAlign,
744 const CXXRecordDecl *Class,
745 CharUnits ExpectedTargetAlign);
748 computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass,
749 CastExpr::path_const_iterator Start,
750 CastExpr::path_const_iterator End);
752 /// Returns the offset from a derived class to a class. Returns null if the
755 GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
756 CastExpr::path_const_iterator PathBegin,
757 CastExpr::path_const_iterator PathEnd);
759 llvm::FoldingSet<BlockByrefHelpers> ByrefHelpersCache;
761 /// Fetches the global unique block count.
762 int getUniqueBlockCount() { return ++Block.GlobalUniqueCount; }
764 /// Fetches the type of a generic block descriptor.
765 llvm::Type *getBlockDescriptorType();
767 /// The type of a generic block literal.
768 llvm::Type *getGenericBlockLiteralType();
770 /// Gets the address of a block which requires no captures.
771 llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, const char *);
773 /// Return a pointer to a constant CFString object for the given string.
774 ConstantAddress GetAddrOfConstantCFString(const StringLiteral *Literal);
776 /// Return a pointer to a constant NSString object for the given string. Or a
777 /// user defined String object as defined via
778 /// -fconstant-string-class=class_name option.
779 ConstantAddress GetAddrOfConstantString(const StringLiteral *Literal);
781 /// Return a constant array for the given string.
782 llvm::Constant *GetConstantArrayFromStringLiteral(const StringLiteral *E);
784 /// Return a pointer to a constant array for the given string literal.
786 GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
787 StringRef Name = ".str");
789 /// Return a pointer to a constant array for the given ObjCEncodeExpr node.
791 GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
793 /// Returns a pointer to a character array containing the literal and a
794 /// terminating '\0' character. The result has pointer to array type.
796 /// \param GlobalName If provided, the name to use for the global (if one is
799 GetAddrOfConstantCString(const std::string &Str,
800 const char *GlobalName = nullptr);
802 /// Returns a pointer to a constant global variable for the given file-scope
803 /// compound literal expression.
804 ConstantAddress GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr*E);
806 /// \brief Returns a pointer to a global variable representing a temporary
807 /// with static or thread storage duration.
808 ConstantAddress GetAddrOfGlobalTemporary(const MaterializeTemporaryExpr *E,
811 /// \brief Retrieve the record type that describes the state of an
812 /// Objective-C fast enumeration loop (for..in).
813 QualType getObjCFastEnumerationStateType();
815 // Produce code for this constructor/destructor. This method doesn't try
816 // to apply any ABI rules about which other constructors/destructors
817 // are needed or if they are alias to each other.
818 llvm::Function *codegenCXXStructor(const CXXMethodDecl *MD,
821 /// Return the address of the constructor/destructor of the given type.
823 getAddrOfCXXStructor(const CXXMethodDecl *MD, StructorType Type,
824 const CGFunctionInfo *FnInfo = nullptr,
825 llvm::FunctionType *FnType = nullptr,
826 bool DontDefer = false, bool IsForDefinition = false);
828 /// Given a builtin id for a function like "__builtin_fabsf", return a
829 /// Function* for "fabsf".
830 llvm::Value *getBuiltinLibFunction(const FunctionDecl *FD,
833 llvm::Function *getIntrinsic(unsigned IID, ArrayRef<llvm::Type*> Tys = None);
835 /// Emit code for a single top level declaration.
836 void EmitTopLevelDecl(Decl *D);
838 /// \brief Stored a deferred empty coverage mapping for an unused
839 /// and thus uninstrumented top level declaration.
840 void AddDeferredUnusedCoverageMapping(Decl *D);
842 /// \brief Remove the deferred empty coverage mapping as this
843 /// declaration is actually instrumented.
844 void ClearUnusedCoverageMapping(const Decl *D);
846 /// \brief Emit all the deferred coverage mappings
847 /// for the uninstrumented functions.
848 void EmitDeferredUnusedCoverageMappings();
850 /// Tell the consumer that this variable has been instantiated.
851 void HandleCXXStaticMemberVarInstantiation(VarDecl *VD);
853 /// \brief If the declaration has internal linkage but is inside an
854 /// extern "C" linkage specification, prepare to emit an alias for it
855 /// to the expected name.
856 template<typename SomeDecl>
857 void MaybeHandleStaticInExternC(const SomeDecl *D, llvm::GlobalValue *GV);
859 /// Add a global to a list to be added to the llvm.used metadata.
860 void addUsedGlobal(llvm::GlobalValue *GV);
862 /// Add a global to a list to be added to the llvm.compiler.used metadata.
863 void addCompilerUsedGlobal(llvm::GlobalValue *GV);
865 /// Add a destructor and object to add to the C++ global destructor function.
866 void AddCXXDtorEntry(llvm::Constant *DtorFn, llvm::Constant *Object) {
867 CXXGlobalDtors.emplace_back(DtorFn, Object);
870 /// Create a new runtime function with the specified type and name.
871 llvm::Constant *CreateRuntimeFunction(llvm::FunctionType *Ty,
873 llvm::AttributeSet ExtraAttrs =
874 llvm::AttributeSet());
875 /// Create a new compiler builtin function with the specified type and name.
876 llvm::Constant *CreateBuiltinFunction(llvm::FunctionType *Ty,
878 llvm::AttributeSet ExtraAttrs =
879 llvm::AttributeSet());
880 /// Create a new runtime global variable with the specified type and name.
881 llvm::Constant *CreateRuntimeVariable(llvm::Type *Ty,
884 ///@name Custom Blocks Runtime Interfaces
887 llvm::Constant *getNSConcreteGlobalBlock();
888 llvm::Constant *getNSConcreteStackBlock();
889 llvm::Constant *getBlockObjectAssign();
890 llvm::Constant *getBlockObjectDispose();
894 llvm::Constant *getLLVMLifetimeStartFn();
895 llvm::Constant *getLLVMLifetimeEndFn();
897 // Make sure that this type is translated.
898 void UpdateCompletedType(const TagDecl *TD);
900 llvm::Constant *getMemberPointerConstant(const UnaryOperator *e);
902 /// Try to emit the initializer for the given declaration as a constant;
903 /// returns 0 if the expression cannot be emitted as a constant.
904 llvm::Constant *EmitConstantInit(const VarDecl &D,
905 CodeGenFunction *CGF = nullptr);
907 /// Try to emit the given expression as a constant; returns 0 if the
908 /// expression cannot be emitted as a constant.
909 llvm::Constant *EmitConstantExpr(const Expr *E, QualType DestType,
910 CodeGenFunction *CGF = nullptr);
912 /// Emit the given constant value as a constant, in the type's scalar
914 llvm::Constant *EmitConstantValue(const APValue &Value, QualType DestType,
915 CodeGenFunction *CGF = nullptr);
917 /// Emit the given constant value as a constant, in the type's memory
919 llvm::Constant *EmitConstantValueForMemory(const APValue &Value,
921 CodeGenFunction *CGF = nullptr);
923 /// \brief Emit type info if type of an expression is a variably modified
924 /// type. Also emit proper debug info for cast types.
925 void EmitExplicitCastExprType(const ExplicitCastExpr *E,
926 CodeGenFunction *CGF = nullptr);
928 /// Return the result of value-initializing the given type, i.e. a null
929 /// expression of the given type. This is usually, but not always, an LLVM
931 llvm::Constant *EmitNullConstant(QualType T);
933 /// Return a null constant appropriate for zero-initializing a base class with
934 /// the given type. This is usually, but not always, an LLVM null constant.
935 llvm::Constant *EmitNullConstantForBase(const CXXRecordDecl *Record);
937 /// Emit a general error that something can't be done.
938 void Error(SourceLocation loc, StringRef error);
940 /// Print out an error that codegen doesn't support the specified stmt yet.
941 void ErrorUnsupported(const Stmt *S, const char *Type);
943 /// Print out an error that codegen doesn't support the specified decl yet.
944 void ErrorUnsupported(const Decl *D, const char *Type);
946 /// Set the attributes on the LLVM function for the given decl and function
947 /// info. This applies attributes necessary for handling the ABI as well as
948 /// user specified attributes like section.
949 void SetInternalFunctionAttributes(const Decl *D, llvm::Function *F,
950 const CGFunctionInfo &FI);
952 /// Set the LLVM function attributes (sext, zext, etc).
953 void SetLLVMFunctionAttributes(const Decl *D,
954 const CGFunctionInfo &Info,
957 /// Set the LLVM function attributes which only apply to a function
959 void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F);
961 /// Return true iff the given type uses 'sret' when used as a return type.
962 bool ReturnTypeUsesSRet(const CGFunctionInfo &FI);
964 /// Return true iff the given type uses an argument slot when 'sret' is used
965 /// as a return type.
966 bool ReturnSlotInterferesWithArgs(const CGFunctionInfo &FI);
968 /// Return true iff the given type uses 'fpret' when used as a return type.
969 bool ReturnTypeUsesFPRet(QualType ResultType);
971 /// Return true iff the given type uses 'fp2ret' when used as a return type.
972 bool ReturnTypeUsesFP2Ret(QualType ResultType);
974 /// Get the LLVM attributes and calling convention to use for a particular
977 /// \param Name - The function name.
978 /// \param Info - The function type information.
979 /// \param CalleeInfo - The callee information these attributes are being
980 /// constructed for. If valid, the attributes applied to this decl may
981 /// contribute to the function attributes and calling convention.
982 /// \param PAL [out] - On return, the attribute list to use.
983 /// \param CallingConv [out] - On return, the LLVM calling convention to use.
984 void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info,
985 CGCalleeInfo CalleeInfo, AttributeListType &PAL,
986 unsigned &CallingConv, bool AttrOnCallSite);
988 // Fills in the supplied string map with the set of target features for the
989 // passed in function.
990 void getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap,
991 const FunctionDecl *FD);
993 StringRef getMangledName(GlobalDecl GD);
994 StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
996 void EmitTentativeDefinition(const VarDecl *D);
998 void EmitVTable(CXXRecordDecl *Class);
1000 void RefreshTypeCacheForClass(const CXXRecordDecl *Class);
1002 /// \brief Appends Opts to the "Linker Options" metadata value.
1003 void AppendLinkerOptions(StringRef Opts);
1005 /// \brief Appends a detect mismatch command to the linker options.
1006 void AddDetectMismatch(StringRef Name, StringRef Value);
1008 /// \brief Appends a dependent lib to the "Linker Options" metadata value.
1009 void AddDependentLib(StringRef Lib);
1011 llvm::GlobalVariable::LinkageTypes getFunctionLinkage(GlobalDecl GD);
1013 void setFunctionLinkage(GlobalDecl GD, llvm::Function *F) {
1014 F->setLinkage(getFunctionLinkage(GD));
1017 /// Set the DLL storage class on F.
1018 void setFunctionDLLStorageClass(GlobalDecl GD, llvm::Function *F);
1020 /// Return the appropriate linkage for the vtable, VTT, and type information
1021 /// of the given class.
1022 llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);
1024 /// Return the store size, in character units, of the given LLVM type.
1025 CharUnits GetTargetTypeStoreSize(llvm::Type *Ty) const;
1027 /// Returns LLVM linkage for a declarator.
1028 llvm::GlobalValue::LinkageTypes
1029 getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage,
1030 bool IsConstantVariable);
1032 /// Returns LLVM linkage for a declarator.
1033 llvm::GlobalValue::LinkageTypes
1034 getLLVMLinkageVarDefinition(const VarDecl *VD, bool IsConstant);
1036 /// Emit all the global annotations.
1037 void EmitGlobalAnnotations();
1039 /// Emit an annotation string.
1040 llvm::Constant *EmitAnnotationString(StringRef Str);
1042 /// Emit the annotation's translation unit.
1043 llvm::Constant *EmitAnnotationUnit(SourceLocation Loc);
1045 /// Emit the annotation line number.
1046 llvm::Constant *EmitAnnotationLineNo(SourceLocation L);
1048 /// Generate the llvm::ConstantStruct which contains the annotation
1049 /// information for a given GlobalValue. The annotation struct is
1050 /// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the
1051 /// GlobalValue being annotated. The second field is the constant string
1052 /// created from the AnnotateAttr's annotation. The third field is a constant
1053 /// string containing the name of the translation unit. The fourth field is
1054 /// the line number in the file of the annotated value declaration.
1055 llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
1056 const AnnotateAttr *AA,
1059 /// Add global annotations that are set on D, for the global GV. Those
1060 /// annotations are emitted during finalization of the LLVM code.
1061 void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV);
1063 bool isInSanitizerBlacklist(llvm::Function *Fn, SourceLocation Loc) const;
1065 bool isInSanitizerBlacklist(llvm::GlobalVariable *GV, SourceLocation Loc,
1067 StringRef Category = StringRef()) const;
1069 SanitizerMetadata *getSanitizerMetadata() {
1070 return SanitizerMD.get();
1073 void addDeferredVTable(const CXXRecordDecl *RD) {
1074 DeferredVTables.push_back(RD);
1077 /// Emit code for a singal global function or var decl. Forward declarations
1078 /// are emitted lazily.
1079 void EmitGlobal(GlobalDecl D);
1081 bool TryEmitDefinitionAsAlias(GlobalDecl Alias, GlobalDecl Target,
1083 bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
1085 /// Set attributes for a global definition.
1086 void setFunctionDefinitionAttributes(const FunctionDecl *D,
1089 llvm::GlobalValue *GetGlobalValue(StringRef Ref);
1091 /// Set attributes which are common to any form of a global definition (alias,
1092 /// Objective-C method, function, global variable).
1094 /// NOTE: This should only be called for definitions.
1095 void SetCommonAttributes(const Decl *D, llvm::GlobalValue *GV);
1097 /// Set attributes which must be preserved by an alias. This includes common
1098 /// attributes (i.e. it includes a call to SetCommonAttributes).
1100 /// NOTE: This should only be called for definitions.
1101 void setAliasAttributes(const Decl *D, llvm::GlobalValue *GV);
1103 void addReplacement(StringRef Name, llvm::Constant *C);
1105 void addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C);
1107 /// \brief Emit a code for threadprivate directive.
1108 /// \param D Threadprivate declaration.
1109 void EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D);
1111 /// Returns whether the given record is blacklisted from control flow
1112 /// integrity checks.
1113 bool IsCFIBlacklistedRecord(const CXXRecordDecl *RD);
1115 /// Emit bit set entries for the given vtable using the given layout if
1116 /// vptr CFI is enabled.
1117 void EmitVTableBitSetEntries(llvm::GlobalVariable *VTable,
1118 const VTableLayout &VTLayout);
1120 /// Generate a cross-DSO type identifier for type.
1121 llvm::ConstantInt *CreateCfiIdForTypeMetadata(llvm::Metadata *MD);
1123 /// Create a metadata identifier for the given type. This may either be an
1124 /// MDString (for external identifiers) or a distinct unnamed MDNode (for
1125 /// internal identifiers).
1126 llvm::Metadata *CreateMetadataIdentifierForType(QualType T);
1128 /// Create a bitset entry for the given function and add it to BitsetsMD.
1129 void CreateFunctionBitSetEntry(const FunctionDecl *FD, llvm::Function *F);
1131 /// Create a bitset entry for the given vtable and add it to BitsetsMD.
1132 void CreateVTableBitSetEntry(llvm::NamedMDNode *BitsetsMD,
1133 llvm::GlobalVariable *VTable, CharUnits Offset,
1134 const CXXRecordDecl *RD);
1136 /// \breif Get the declaration of std::terminate for the platform.
1137 llvm::Constant *getTerminateFn();
1139 llvm::SanitizerStatReport &getSanStats();
1143 GetOrCreateLLVMFunction(StringRef MangledName, llvm::Type *Ty, GlobalDecl D,
1144 bool ForVTable, bool DontDefer = false,
1145 bool IsThunk = false,
1146 llvm::AttributeSet ExtraAttrs = llvm::AttributeSet(),
1147 bool IsForDefinition = false);
1149 llvm::Constant *GetOrCreateLLVMGlobal(StringRef MangledName,
1150 llvm::PointerType *PTy,
1152 bool IsForDefinition = false);
1154 void setNonAliasAttributes(const Decl *D, llvm::GlobalObject *GO);
1156 /// Set function attributes for a function declaration.
1157 void SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1158 bool IsIncompleteFunction, bool IsThunk);
1160 void EmitGlobalDefinition(GlobalDecl D, llvm::GlobalValue *GV = nullptr);
1162 void EmitGlobalFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
1163 void EmitGlobalVarDefinition(const VarDecl *D, bool IsTentative = false);
1164 void EmitAliasDefinition(GlobalDecl GD);
1165 void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
1166 void EmitObjCIvarInitializations(ObjCImplementationDecl *D);
1168 // C++ related functions.
1170 void EmitNamespace(const NamespaceDecl *D);
1171 void EmitLinkageSpec(const LinkageSpecDecl *D);
1172 void CompleteDIClassType(const CXXMethodDecl* D);
1174 /// \brief Emit the function that initializes C++ thread_local variables.
1175 void EmitCXXThreadLocalInitFunc();
1177 /// Emit the function that initializes C++ globals.
1178 void EmitCXXGlobalInitFunc();
1180 /// Emit the function that destroys C++ globals.
1181 void EmitCXXGlobalDtorFunc();
1183 /// Emit the function that initializes the specified global (if PerformInit is
1184 /// true) and registers its destructor.
1185 void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
1186 llvm::GlobalVariable *Addr,
1189 void EmitPointerToInitFunc(const VarDecl *VD, llvm::GlobalVariable *Addr,
1190 llvm::Function *InitFunc, InitSegAttr *ISA);
1192 // FIXME: Hardcoding priority here is gross.
1193 void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
1194 llvm::Constant *AssociatedData = nullptr);
1195 void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535);
1197 /// Generates a global array of functions and priorities using the given list
1198 /// and name. This array will have appending linkage and is suitable for use
1199 /// as a LLVM constructor or destructor array.
1200 void EmitCtorList(const CtorList &Fns, const char *GlobalName);
1202 /// Emit any needed decls for which code generation was deferred.
1203 void EmitDeferred();
1205 /// Call replaceAllUsesWith on all pairs in Replacements.
1206 void applyReplacements();
1208 /// Call replaceAllUsesWith on all pairs in GlobalValReplacements.
1209 void applyGlobalValReplacements();
1211 void checkAliases();
1213 /// Emit any vtables which we deferred and still have a use for.
1214 void EmitDeferredVTables();
1216 /// Emit the llvm.used and llvm.compiler.used metadata.
1217 void emitLLVMUsed();
1219 /// \brief Emit the link options introduced by imported modules.
1220 void EmitModuleLinkOptions();
1222 /// \brief Emit aliases for internal-linkage declarations inside "C" language
1223 /// linkage specifications, giving them the "expected" name where possible.
1224 void EmitStaticExternCAliases();
1226 void EmitDeclMetadata();
1228 /// \brief Emit the Clang version as llvm.ident metadata.
1229 void EmitVersionIdentMetadata();
1231 /// Emits target specific Metadata for global declarations.
1232 void EmitTargetMetadata();
1234 /// Emit the llvm.gcov metadata used to tell LLVM where to emit the .gcno and
1235 /// .gcda files in a way that persists in .bc files.
1236 void EmitCoverageFile();
1238 /// Emits the initializer for a uuidof string.
1239 llvm::Constant *EmitUuidofInitializer(StringRef uuidstr);
1241 /// Determine whether the definition must be emitted; if this returns \c
1242 /// false, the definition can be emitted lazily if it's used.
1243 bool MustBeEmitted(const ValueDecl *D);
1245 /// Determine whether the definition can be emitted eagerly, or should be
1246 /// delayed until the end of the translation unit. This is relevant for
1247 /// definitions whose linkage can change, e.g. implicit function instantions
1248 /// which may later be explicitly instantiated.
1249 bool MayBeEmittedEagerly(const ValueDecl *D);
1251 /// Check whether we can use a "simpler", more core exceptions personality
1253 void SimplifyPersonality();
1255 } // end namespace CodeGen
1256 } // end namespace clang
1258 #endif // LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H