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 CLANG_CODEGEN_CODEGENMODULE_H
15 #define CLANG_CODEGEN_CODEGENMODULE_H
17 #include "clang/Basic/ABI.h"
18 #include "clang/Basic/LangOptions.h"
19 #include "clang/AST/Attr.h"
20 #include "clang/AST/DeclCXX.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/AST/GlobalDecl.h"
23 #include "clang/AST/Mangle.h"
24 #include "CGVTables.h"
25 #include "CodeGenTypes.h"
26 #include "llvm/Module.h"
27 #include "llvm/ADT/DenseMap.h"
28 #include "llvm/ADT/StringMap.h"
29 #include "llvm/ADT/StringSet.h"
30 #include "llvm/ADT/SmallPtrSet.h"
31 #include "llvm/Support/ValueHandle.h"
45 class TargetCodeGenInfo;
50 class ObjCImplementationDecl;
51 class ObjCCategoryImplDecl;
52 class ObjCProtocolDecl;
65 class DiagnosticsEngine;
67 class CXXDestructorDecl;
73 class CodeGenFunction;
78 class CGOpenCLRuntime;
80 class BlockFieldFlags;
81 class FunctionArgList;
83 struct OrderGlobalInits {
84 unsigned int priority;
85 unsigned int lex_order;
86 OrderGlobalInits(unsigned int p, unsigned int l)
87 : priority(p), lex_order(l) {}
89 bool operator==(const OrderGlobalInits &RHS) const {
90 return priority == RHS.priority &&
91 lex_order == RHS.lex_order;
94 bool operator<(const OrderGlobalInits &RHS) const {
95 if (priority < RHS.priority)
98 return priority == RHS.priority && lex_order < RHS.lex_order;
102 struct CodeGenTypeCache {
107 llvm::IntegerType *Int8Ty, *Int32Ty, *Int64Ty;
110 llvm::IntegerType *IntTy;
112 /// intptr_t, size_t, and ptrdiff_t, which we assume are the same size.
114 llvm::IntegerType *IntPtrTy;
115 llvm::IntegerType *SizeTy;
116 llvm::IntegerType *PtrDiffTy;
119 /// void* in address space 0
121 llvm::PointerType *VoidPtrTy;
122 llvm::PointerType *Int8PtrTy;
125 /// void** in address space 0
127 llvm::PointerType *VoidPtrPtrTy;
128 llvm::PointerType *Int8PtrPtrTy;
131 /// The width of a pointer into the generic address space.
132 unsigned char PointerWidthInBits;
134 /// The size and alignment of a pointer into the generic address
137 unsigned char PointerAlignInBytes;
138 unsigned char PointerSizeInBytes;
142 struct RREntrypoints {
143 RREntrypoints() { memset(this, 0, sizeof(*this)); }
144 /// void objc_autoreleasePoolPop(void*);
145 llvm::Constant *objc_autoreleasePoolPop;
147 /// void *objc_autoreleasePoolPush(void);
148 llvm::Constant *objc_autoreleasePoolPush;
151 struct ARCEntrypoints {
152 ARCEntrypoints() { memset(this, 0, sizeof(*this)); }
154 /// id objc_autorelease(id);
155 llvm::Constant *objc_autorelease;
157 /// id objc_autoreleaseReturnValue(id);
158 llvm::Constant *objc_autoreleaseReturnValue;
160 /// void objc_copyWeak(id *dest, id *src);
161 llvm::Constant *objc_copyWeak;
163 /// void objc_destroyWeak(id*);
164 llvm::Constant *objc_destroyWeak;
166 /// id objc_initWeak(id*, id);
167 llvm::Constant *objc_initWeak;
169 /// id objc_loadWeak(id*);
170 llvm::Constant *objc_loadWeak;
172 /// id objc_loadWeakRetained(id*);
173 llvm::Constant *objc_loadWeakRetained;
175 /// void objc_moveWeak(id *dest, id *src);
176 llvm::Constant *objc_moveWeak;
178 /// id objc_retain(id);
179 llvm::Constant *objc_retain;
181 /// id objc_retainAutorelease(id);
182 llvm::Constant *objc_retainAutorelease;
184 /// id objc_retainAutoreleaseReturnValue(id);
185 llvm::Constant *objc_retainAutoreleaseReturnValue;
187 /// id objc_retainAutoreleasedReturnValue(id);
188 llvm::Constant *objc_retainAutoreleasedReturnValue;
190 /// id objc_retainBlock(id);
191 llvm::Constant *objc_retainBlock;
193 /// void objc_release(id);
194 llvm::Constant *objc_release;
196 /// id objc_storeStrong(id*, id);
197 llvm::Constant *objc_storeStrong;
199 /// id objc_storeWeak(id*, id);
200 llvm::Constant *objc_storeWeak;
202 /// A void(void) inline asm to use to mark that the return value of
203 /// a call will be immediately retain.
204 llvm::InlineAsm *retainAutoreleasedReturnValueMarker;
207 /// CodeGenModule - This class organizes the cross-function state that is used
208 /// while generating LLVM code.
209 class CodeGenModule : public CodeGenTypeCache {
210 CodeGenModule(const CodeGenModule&); // DO NOT IMPLEMENT
211 void operator=(const CodeGenModule&); // DO NOT IMPLEMENT
213 typedef std::vector<std::pair<llvm::Constant*, int> > CtorList;
216 const LangOptions &Features;
217 const CodeGenOptions &CodeGenOpts;
218 llvm::Module &TheModule;
219 const llvm::TargetData &TheTargetData;
220 mutable const TargetCodeGenInfo *TheTargetCodeGenInfo;
221 DiagnosticsEngine &Diags;
226 /// VTables - Holds information about C++ vtables.
227 CodeGenVTables VTables;
228 friend class CodeGenVTables;
230 CGObjCRuntime* ObjCRuntime;
231 CGOpenCLRuntime* OpenCLRuntime;
232 CGCUDARuntime* CUDARuntime;
233 CGDebugInfo* DebugInfo;
234 ARCEntrypoints *ARCData;
235 RREntrypoints *RRData;
237 // WeakRefReferences - A set of references that have only been seen via
238 // a weakref so far. This is used to remove the weak of the reference if we ever
239 // see a direct reference or a definition.
240 llvm::SmallPtrSet<llvm::GlobalValue*, 10> WeakRefReferences;
242 /// DeferredDecls - This contains all the decls which have definitions but
243 /// which are deferred for emission and therefore should only be output if
244 /// they are actually used. If a decl is in this, then it is known to have
245 /// not been referenced yet.
246 llvm::StringMap<GlobalDecl> DeferredDecls;
248 /// DeferredDeclsToEmit - This is a list of deferred decls which we have seen
249 /// that *are* actually referenced. These get code generated when the module
251 std::vector<GlobalDecl> DeferredDeclsToEmit;
253 /// LLVMUsed - List of global values which are required to be
254 /// present in the object file; bitcast to i8*. This is used for
255 /// forcing visibility of symbols which may otherwise be optimized
257 std::vector<llvm::WeakVH> LLVMUsed;
259 /// GlobalCtors - Store the list of global constructors and their respective
260 /// priorities to be emitted when the translation unit is complete.
261 CtorList GlobalCtors;
263 /// GlobalDtors - Store the list of global destructors and their respective
264 /// priorities to be emitted when the translation unit is complete.
265 CtorList GlobalDtors;
267 /// MangledDeclNames - A map of canonical GlobalDecls to their mangled names.
268 llvm::DenseMap<GlobalDecl, StringRef> MangledDeclNames;
269 llvm::BumpPtrAllocator MangledNamesAllocator;
271 /// Global annotations.
272 std::vector<llvm::Constant*> Annotations;
274 /// Map used to get unique annotation strings.
275 llvm::StringMap<llvm::Constant*> AnnotationStrings;
277 llvm::StringMap<llvm::Constant*> CFConstantStringMap;
278 llvm::StringMap<llvm::GlobalVariable*> ConstantStringMap;
279 llvm::DenseMap<const Decl*, llvm::Value*> StaticLocalDeclMap;
281 /// CXXGlobalInits - Global variables with initializers that need to run
283 std::vector<llvm::Constant*> CXXGlobalInits;
285 /// When a C++ decl with an initializer is deferred, null is
286 /// appended to CXXGlobalInits, and the index of that null is placed
287 /// here so that the initializer will be performed in the correct
289 llvm::DenseMap<const Decl*, unsigned> DelayedCXXInitPosition;
291 /// - Global variables with initializers whose order of initialization
292 /// is set by init_priority attribute.
294 SmallVector<std::pair<OrderGlobalInits, llvm::Function*>, 8>
295 PrioritizedCXXGlobalInits;
297 /// CXXGlobalDtors - Global destructor functions and arguments that need to
298 /// run on termination.
299 std::vector<std::pair<llvm::WeakVH,llvm::Constant*> > CXXGlobalDtors;
301 /// @name Cache for Objective-C runtime types
304 /// CFConstantStringClassRef - Cached reference to the class for constant
305 /// strings. This value has type int * but is actually an Obj-C class pointer.
306 llvm::Constant *CFConstantStringClassRef;
308 /// ConstantStringClassRef - Cached reference to the class for constant
309 /// strings. This value has type int * but is actually an Obj-C class pointer.
310 llvm::Constant *ConstantStringClassRef;
312 /// \brief The LLVM type corresponding to NSConstantString.
313 llvm::StructType *NSConstantStringType;
315 /// \brief The type used to describe the state of a fast enumeration in
316 /// Objective-C's for..in loop.
317 QualType ObjCFastEnumerationStateType;
321 /// Lazily create the Objective-C runtime
322 void createObjCRuntime();
324 void createOpenCLRuntime();
325 void createCUDARuntime();
327 llvm::LLVMContext &VMContext;
329 /// @name Cache for Blocks Runtime Globals
332 llvm::Constant *NSConcreteGlobalBlock;
333 llvm::Constant *NSConcreteStackBlock;
335 llvm::Constant *BlockObjectAssign;
336 llvm::Constant *BlockObjectDispose;
338 llvm::Type *BlockDescriptorType;
339 llvm::Type *GenericBlockLiteralType;
342 int GlobalUniqueCount;
347 CodeGenModule(ASTContext &C, const CodeGenOptions &CodeGenOpts,
348 llvm::Module &M, const llvm::TargetData &TD,
349 DiagnosticsEngine &Diags);
353 /// Release - Finalize LLVM code generation.
356 /// getObjCRuntime() - Return a reference to the configured
357 /// Objective-C runtime.
358 CGObjCRuntime &getObjCRuntime() {
359 if (!ObjCRuntime) createObjCRuntime();
363 /// hasObjCRuntime() - Return true iff an Objective-C runtime has
365 bool hasObjCRuntime() { return !!ObjCRuntime; }
367 /// getOpenCLRuntime() - Return a reference to the configured OpenCL runtime.
368 CGOpenCLRuntime &getOpenCLRuntime() {
369 assert(OpenCLRuntime != 0);
370 return *OpenCLRuntime;
373 /// getCUDARuntime() - Return a reference to the configured CUDA runtime.
374 CGCUDARuntime &getCUDARuntime() {
375 assert(CUDARuntime != 0);
379 /// getCXXABI() - Return a reference to the configured C++ ABI.
380 CGCXXABI &getCXXABI() { return ABI; }
382 ARCEntrypoints &getARCEntrypoints() const {
383 assert(getLangOptions().ObjCAutoRefCount && ARCData != 0);
387 RREntrypoints &getRREntrypoints() const {
392 llvm::Value *getStaticLocalDeclAddress(const VarDecl *VD) {
393 return StaticLocalDeclMap[VD];
395 void setStaticLocalDeclAddress(const VarDecl *D,
396 llvm::GlobalVariable *GV) {
397 StaticLocalDeclMap[D] = GV;
400 CGDebugInfo *getModuleDebugInfo() { return DebugInfo; }
402 ASTContext &getContext() const { return Context; }
403 const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
404 const LangOptions &getLangOptions() const { return Features; }
405 llvm::Module &getModule() const { return TheModule; }
406 CodeGenTypes &getTypes() { return Types; }
407 CodeGenVTables &getVTables() { return VTables; }
408 VTableContext &getVTableContext() { return VTables.getVTableContext(); }
409 DiagnosticsEngine &getDiags() const { return Diags; }
410 const llvm::TargetData &getTargetData() const { return TheTargetData; }
411 const TargetInfo &getTarget() const { return Context.getTargetInfo(); }
412 llvm::LLVMContext &getLLVMContext() { return VMContext; }
413 const TargetCodeGenInfo &getTargetCodeGenInfo();
414 bool isTargetDarwin() const;
416 bool shouldUseTBAA() const { return TBAA != 0; }
418 llvm::MDNode *getTBAAInfo(QualType QTy);
420 static void DecorateInstruction(llvm::Instruction *Inst,
421 llvm::MDNode *TBAAInfo);
423 /// getSize - Emit the given number of characters as a value of type size_t.
424 llvm::ConstantInt *getSize(CharUnits numChars);
426 /// setGlobalVisibility - Set the visibility for the given LLVM
428 void setGlobalVisibility(llvm::GlobalValue *GV, const NamedDecl *D) const;
430 /// TypeVisibilityKind - The kind of global variable that is passed to
431 /// setTypeVisibility
432 enum TypeVisibilityKind {
435 TVK_ForConstructionVTable,
440 /// setTypeVisibility - Set the visibility for the given global
441 /// value which holds information about a type.
442 void setTypeVisibility(llvm::GlobalValue *GV, const CXXRecordDecl *D,
443 TypeVisibilityKind TVK) const;
445 static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V) {
447 case DefaultVisibility: return llvm::GlobalValue::DefaultVisibility;
448 case HiddenVisibility: return llvm::GlobalValue::HiddenVisibility;
449 case ProtectedVisibility: return llvm::GlobalValue::ProtectedVisibility;
451 llvm_unreachable("unknown visibility!");
452 return llvm::GlobalValue::DefaultVisibility;
455 llvm::Constant *GetAddrOfGlobal(GlobalDecl GD) {
456 if (isa<CXXConstructorDecl>(GD.getDecl()))
457 return GetAddrOfCXXConstructor(cast<CXXConstructorDecl>(GD.getDecl()),
459 else if (isa<CXXDestructorDecl>(GD.getDecl()))
460 return GetAddrOfCXXDestructor(cast<CXXDestructorDecl>(GD.getDecl()),
462 else if (isa<FunctionDecl>(GD.getDecl()))
463 return GetAddrOfFunction(GD);
465 return GetAddrOfGlobalVar(cast<VarDecl>(GD.getDecl()));
468 /// CreateOrReplaceCXXRuntimeVariable - Will return a global variable of the given
469 /// type. If a variable with a different type already exists then a new
470 /// variable with the right type will be created and all uses of the old
471 /// variable will be replaced with a bitcast to the new variable.
472 llvm::GlobalVariable *
473 CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty,
474 llvm::GlobalValue::LinkageTypes Linkage);
476 /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
477 /// given global variable. If Ty is non-null and if the global doesn't exist,
478 /// then it will be greated with the specified type instead of whatever the
479 /// normal requested type would be.
480 llvm::Constant *GetAddrOfGlobalVar(const VarDecl *D,
484 /// GetAddrOfFunction - Return the address of the given function. If Ty is
485 /// non-null, then this function will use the specified type if it has to
487 llvm::Constant *GetAddrOfFunction(GlobalDecl GD,
489 bool ForVTable = false);
491 /// GetAddrOfRTTIDescriptor - Get the address of the RTTI descriptor
492 /// for the given type.
493 llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH = false);
495 /// GetAddrOfThunk - Get the address of the thunk for the given global decl.
496 llvm::Constant *GetAddrOfThunk(GlobalDecl GD, const ThunkInfo &Thunk);
498 /// GetWeakRefReference - Get a reference to the target of VD.
499 llvm::Constant *GetWeakRefReference(const ValueDecl *VD);
501 /// GetNonVirtualBaseClassOffset - Returns the offset from a derived class to
502 /// a class. Returns null if the offset is 0.
504 GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
505 CastExpr::path_const_iterator PathBegin,
506 CastExpr::path_const_iterator PathEnd);
508 /// A pair of helper functions for a __block variable.
509 class ByrefHelpers : public llvm::FoldingSetNode {
511 llvm::Constant *CopyHelper;
512 llvm::Constant *DisposeHelper;
514 /// The alignment of the field. This is important because
515 /// different offsets to the field within the byref struct need to
516 /// have different helper functions.
519 ByrefHelpers(CharUnits alignment) : Alignment(alignment) {}
520 virtual ~ByrefHelpers();
522 void Profile(llvm::FoldingSetNodeID &id) const {
523 id.AddInteger(Alignment.getQuantity());
526 virtual void profileImpl(llvm::FoldingSetNodeID &id) const = 0;
528 virtual bool needsCopy() const { return true; }
529 virtual void emitCopy(CodeGenFunction &CGF,
530 llvm::Value *dest, llvm::Value *src) = 0;
532 virtual bool needsDispose() const { return true; }
533 virtual void emitDispose(CodeGenFunction &CGF, llvm::Value *field) = 0;
536 llvm::FoldingSet<ByrefHelpers> ByrefHelpersCache;
538 /// getUniqueBlockCount - Fetches the global unique block count.
539 int getUniqueBlockCount() { return ++Block.GlobalUniqueCount; }
541 /// getBlockDescriptorType - Fetches the type of a generic block
543 llvm::Type *getBlockDescriptorType();
545 /// getGenericBlockLiteralType - The type of a generic block literal.
546 llvm::Type *getGenericBlockLiteralType();
548 /// GetAddrOfGlobalBlock - Gets the address of a block which
549 /// requires no captures.
550 llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, const char *);
552 /// GetStringForStringLiteral - Return the appropriate bytes for a string
553 /// literal, properly padded to match the literal type. If only the address of
554 /// a constant is needed consider using GetAddrOfConstantStringLiteral.
555 std::string GetStringForStringLiteral(const StringLiteral *E);
557 /// GetAddrOfConstantCFString - Return a pointer to a constant CFString object
558 /// for the given string.
559 llvm::Constant *GetAddrOfConstantCFString(const StringLiteral *Literal);
561 /// GetAddrOfConstantString - Return a pointer to a constant NSString object
562 /// for the given string. Or a user defined String object as defined via
563 /// -fconstant-string-class=class_name option.
564 llvm::Constant *GetAddrOfConstantString(const StringLiteral *Literal);
566 /// GetAddrOfConstantStringFromLiteral - Return a pointer to a constant array
567 /// for the given string literal.
568 llvm::Constant *GetAddrOfConstantStringFromLiteral(const StringLiteral *S);
570 /// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
571 /// array for the given ObjCEncodeExpr node.
572 llvm::Constant *GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
574 /// GetAddrOfConstantString - Returns a pointer to a character array
575 /// containing the literal. This contents are exactly that of the given
576 /// string, i.e. it will not be null terminated automatically; see
577 /// GetAddrOfConstantCString. Note that whether the result is actually a
578 /// pointer to an LLVM constant depends on Feature.WriteableStrings.
580 /// The result has pointer to array type.
582 /// \param GlobalName If provided, the name to use for the global
583 /// (if one is created).
584 llvm::Constant *GetAddrOfConstantString(StringRef Str,
585 const char *GlobalName=0,
586 unsigned Alignment=1);
588 /// GetAddrOfConstantCString - Returns a pointer to a character array
589 /// containing the literal and a terminating '\0' character. The result has
590 /// pointer to array type.
592 /// \param GlobalName If provided, the name to use for the global (if one is
594 llvm::Constant *GetAddrOfConstantCString(const std::string &str,
595 const char *GlobalName=0,
596 unsigned Alignment=1);
598 /// \brief Retrieve the record type that describes the state of an
599 /// Objective-C fast enumeration loop (for..in).
600 QualType getObjCFastEnumerationStateType();
602 /// GetAddrOfCXXConstructor - Return the address of the constructor of the
604 llvm::GlobalValue *GetAddrOfCXXConstructor(const CXXConstructorDecl *ctor,
605 CXXCtorType ctorType,
606 const CGFunctionInfo *fnInfo = 0);
608 /// GetAddrOfCXXDestructor - Return the address of the constructor of the
610 llvm::GlobalValue *GetAddrOfCXXDestructor(const CXXDestructorDecl *dtor,
611 CXXDtorType dtorType,
612 const CGFunctionInfo *fnInfo = 0);
614 /// getBuiltinLibFunction - Given a builtin id for a function like
615 /// "__builtin_fabsf", return a Function* for "fabsf".
616 llvm::Value *getBuiltinLibFunction(const FunctionDecl *FD,
619 llvm::Function *getIntrinsic(unsigned IID, ArrayRef<llvm::Type*> Tys =
620 ArrayRef<llvm::Type*>());
622 /// EmitTopLevelDecl - Emit code for a single top level declaration.
623 void EmitTopLevelDecl(Decl *D);
625 /// AddUsedGlobal - Add a global which should be forced to be
626 /// present in the object file; these are emitted to the llvm.used
628 void AddUsedGlobal(llvm::GlobalValue *GV);
630 /// AddCXXDtorEntry - Add a destructor and object to add to the C++ global
631 /// destructor function.
632 void AddCXXDtorEntry(llvm::Constant *DtorFn, llvm::Constant *Object) {
633 CXXGlobalDtors.push_back(std::make_pair(DtorFn, Object));
636 /// CreateRuntimeFunction - Create a new runtime function with the specified
638 llvm::Constant *CreateRuntimeFunction(llvm::FunctionType *Ty,
640 llvm::Attributes ExtraAttrs =
641 llvm::Attribute::None);
642 /// CreateRuntimeVariable - Create a new runtime global variable with the
643 /// specified type and name.
644 llvm::Constant *CreateRuntimeVariable(llvm::Type *Ty,
647 ///@name Custom Blocks Runtime Interfaces
650 llvm::Constant *getNSConcreteGlobalBlock();
651 llvm::Constant *getNSConcreteStackBlock();
652 llvm::Constant *getBlockObjectAssign();
653 llvm::Constant *getBlockObjectDispose();
657 // UpdateCompleteType - Make sure that this type is translated.
658 void UpdateCompletedType(const TagDecl *TD);
660 llvm::Constant *getMemberPointerConstant(const UnaryOperator *e);
662 /// EmitConstantExpr - Try to emit the given expression as a
663 /// constant; returns 0 if the expression cannot be emitted as a
665 llvm::Constant *EmitConstantExpr(const Expr *E, QualType DestType,
666 CodeGenFunction *CGF = 0);
668 /// EmitNullConstant - Return the result of value-initializing the given
669 /// type, i.e. a null expression of the given type. This is usually,
670 /// but not always, an LLVM null constant.
671 llvm::Constant *EmitNullConstant(QualType T);
673 /// EmitNullConstantForBase - Return a null constant appropriate for
674 /// zero-initializing a base class with the given type. This is usually,
675 /// but not always, an LLVM null constant.
676 llvm::Constant *EmitNullConstantForBase(const CXXRecordDecl *Record);
678 /// Error - Emit a general error that something can't be done.
679 void Error(SourceLocation loc, StringRef error);
681 /// ErrorUnsupported - Print out an error that codegen doesn't support the
682 /// specified stmt yet.
683 /// \param OmitOnError - If true, then this error should only be emitted if no
684 /// other errors have been reported.
685 void ErrorUnsupported(const Stmt *S, const char *Type,
686 bool OmitOnError=false);
688 /// ErrorUnsupported - Print out an error that codegen doesn't support the
689 /// specified decl yet.
690 /// \param OmitOnError - If true, then this error should only be emitted if no
691 /// other errors have been reported.
692 void ErrorUnsupported(const Decl *D, const char *Type,
693 bool OmitOnError=false);
695 /// SetInternalFunctionAttributes - Set the attributes on the LLVM
696 /// function for the given decl and function info. This applies
697 /// attributes necessary for handling the ABI as well as user
698 /// specified attributes like section.
699 void SetInternalFunctionAttributes(const Decl *D, llvm::Function *F,
700 const CGFunctionInfo &FI);
702 /// SetLLVMFunctionAttributes - Set the LLVM function attributes
703 /// (sext, zext, etc).
704 void SetLLVMFunctionAttributes(const Decl *D,
705 const CGFunctionInfo &Info,
708 /// SetLLVMFunctionAttributesForDefinition - Set the LLVM function attributes
709 /// which only apply to a function definintion.
710 void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F);
712 /// ReturnTypeUsesSRet - Return true iff the given type uses 'sret' when used
713 /// as a return type.
714 bool ReturnTypeUsesSRet(const CGFunctionInfo &FI);
716 /// ReturnTypeUsesSret - Return true iff the given type uses 'fpret' when used
717 /// as a return type.
718 bool ReturnTypeUsesFPRet(QualType ResultType);
720 /// ConstructAttributeList - Get the LLVM attributes and calling convention to
721 /// use for a particular function type.
723 /// \param Info - The function type information.
724 /// \param TargetDecl - The decl these attributes are being constructed
725 /// for. If supplied the attributes applied to this decl may contribute to the
726 /// function attributes and calling convention.
727 /// \param PAL [out] - On return, the attribute list to use.
728 /// \param CallingConv [out] - On return, the LLVM calling convention to use.
729 void ConstructAttributeList(const CGFunctionInfo &Info,
730 const Decl *TargetDecl,
731 AttributeListType &PAL,
732 unsigned &CallingConv);
734 StringRef getMangledName(GlobalDecl GD);
735 void getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
736 const BlockDecl *BD);
738 void EmitTentativeDefinition(const VarDecl *D);
740 void EmitVTable(CXXRecordDecl *Class, bool DefinitionRequired);
742 llvm::GlobalVariable::LinkageTypes
743 getFunctionLinkage(const FunctionDecl *FD);
745 void setFunctionLinkage(const FunctionDecl *FD, llvm::GlobalValue *V) {
746 V->setLinkage(getFunctionLinkage(FD));
749 /// getVTableLinkage - Return the appropriate linkage for the vtable, VTT,
750 /// and type information of the given class.
751 llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);
753 /// GetTargetTypeStoreSize - Return the store size, in character units, of
754 /// the given LLVM type.
755 CharUnits GetTargetTypeStoreSize(llvm::Type *Ty) const;
757 /// GetLLVMLinkageVarDefinition - Returns LLVM linkage for a global
759 llvm::GlobalValue::LinkageTypes
760 GetLLVMLinkageVarDefinition(const VarDecl *D,
761 llvm::GlobalVariable *GV);
763 std::vector<const CXXRecordDecl*> DeferredVTables;
765 /// Emit all the global annotations.
766 void EmitGlobalAnnotations();
768 /// Emit an annotation string.
769 llvm::Constant *EmitAnnotationString(llvm::StringRef Str);
771 /// Emit the annotation's translation unit.
772 llvm::Constant *EmitAnnotationUnit(SourceLocation Loc);
774 /// Emit the annotation line number.
775 llvm::Constant *EmitAnnotationLineNo(SourceLocation L);
777 /// EmitAnnotateAttr - Generate the llvm::ConstantStruct which contains the
778 /// annotation information for a given GlobalValue. The annotation struct is
779 /// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the
780 /// GlobalValue being annotated. The second field is the constant string
781 /// created from the AnnotateAttr's annotation. The third field is a constant
782 /// string containing the name of the translation unit. The fourth field is
783 /// the line number in the file of the annotated value declaration.
784 llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
785 const AnnotateAttr *AA,
788 /// Add global annotations that are set on D, for the global GV. Those
789 /// annotations are emitted during finalization of the LLVM code.
790 void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV);
793 llvm::GlobalValue *GetGlobalValue(StringRef Ref);
795 llvm::Constant *GetOrCreateLLVMFunction(StringRef MangledName,
799 llvm::Attributes ExtraAttrs =
800 llvm::Attribute::None);
801 llvm::Constant *GetOrCreateLLVMGlobal(StringRef MangledName,
802 llvm::PointerType *PTy,
804 bool UnnamedAddr = false);
806 /// SetCommonAttributes - Set attributes which are common to any
807 /// form of a global definition (alias, Objective-C method,
808 /// function, global variable).
810 /// NOTE: This should only be called for definitions.
811 void SetCommonAttributes(const Decl *D, llvm::GlobalValue *GV);
813 /// SetFunctionDefinitionAttributes - Set attributes for a global definition.
814 void SetFunctionDefinitionAttributes(const FunctionDecl *D,
815 llvm::GlobalValue *GV);
817 /// SetFunctionAttributes - Set function attributes for a function
819 void SetFunctionAttributes(GlobalDecl GD,
821 bool IsIncompleteFunction);
823 /// EmitGlobal - Emit code for a singal global function or var decl. Forward
824 /// declarations are emitted lazily.
825 void EmitGlobal(GlobalDecl D);
827 void EmitGlobalDefinition(GlobalDecl D);
829 void EmitGlobalFunctionDefinition(GlobalDecl GD);
830 void EmitGlobalVarDefinition(const VarDecl *D);
831 void EmitAliasDefinition(GlobalDecl GD);
832 void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
833 void EmitObjCIvarInitializations(ObjCImplementationDecl *D);
835 // C++ related functions.
837 bool TryEmitDefinitionAsAlias(GlobalDecl Alias, GlobalDecl Target);
838 bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
840 void EmitNamespace(const NamespaceDecl *D);
841 void EmitLinkageSpec(const LinkageSpecDecl *D);
843 /// EmitCXXConstructors - Emit constructors (base, complete) from a
844 /// C++ constructor Decl.
845 void EmitCXXConstructors(const CXXConstructorDecl *D);
847 /// EmitCXXConstructor - Emit a single constructor with the given type from
848 /// a C++ constructor Decl.
849 void EmitCXXConstructor(const CXXConstructorDecl *D, CXXCtorType Type);
851 /// EmitCXXDestructors - Emit destructors (base, complete) from a
852 /// C++ destructor Decl.
853 void EmitCXXDestructors(const CXXDestructorDecl *D);
855 /// EmitCXXDestructor - Emit a single destructor with the given type from
856 /// a C++ destructor Decl.
857 void EmitCXXDestructor(const CXXDestructorDecl *D, CXXDtorType Type);
859 /// EmitCXXGlobalInitFunc - Emit the function that initializes C++ globals.
860 void EmitCXXGlobalInitFunc();
862 /// EmitCXXGlobalDtorFunc - Emit the function that destroys C++ globals.
863 void EmitCXXGlobalDtorFunc();
865 void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
866 llvm::GlobalVariable *Addr);
868 // FIXME: Hardcoding priority here is gross.
869 void AddGlobalCtor(llvm::Function *Ctor, int Priority=65535);
870 void AddGlobalDtor(llvm::Function *Dtor, int Priority=65535);
872 /// EmitCtorList - Generates a global array of functions and priorities using
873 /// the given list and name. This array will have appending linkage and is
874 /// suitable for use as a LLVM constructor or destructor array.
875 void EmitCtorList(const CtorList &Fns, const char *GlobalName);
877 /// EmitFundamentalRTTIDescriptor - Emit the RTTI descriptors for the
879 void EmitFundamentalRTTIDescriptor(QualType Type);
881 /// EmitFundamentalRTTIDescriptors - Emit the RTTI descriptors for the
883 void EmitFundamentalRTTIDescriptors();
885 /// EmitDeferred - Emit any needed decls for which code generation
887 void EmitDeferred(void);
889 /// EmitLLVMUsed - Emit the llvm.used metadata used to force
890 /// references to global which may otherwise be optimized out.
891 void EmitLLVMUsed(void);
893 void EmitDeclMetadata();
895 /// EmitCoverageFile - Emit the llvm.gcov metadata used to tell LLVM where
896 /// to emit the .gcno and .gcda files in a way that persists in .bc files.
897 void EmitCoverageFile();
899 /// MayDeferGeneration - Determine if the given decl can be emitted
900 /// lazily; this is only relevant for definitions. The given decl
901 /// must be either a function or var decl.
902 bool MayDeferGeneration(const ValueDecl *D);
904 /// SimplifyPersonality - Check whether we can use a "simpler", more
905 /// core exceptions personality function.
906 void SimplifyPersonality();
908 } // end namespace CodeGen
909 } // end namespace clang