CodeGenModule.h source code [llvm_projects/clang/lib/CodeGen/CodeGenModule.h]

1	//===--- CodeGenModule.h - Per-Module state for LLVM CodeGen ----- C++ --===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This is the internal per-translation-unit state used for llvm translation.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
14	#define LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
15
16	#include "CGVTables.h"
17	#include "CodeGenTypeCache.h"
18	#include "CodeGenTypes.h"
19	#include "SanitizerMetadata.h"
20	#include "TrapReasonBuilder.h"
21	#include "clang/AST/DeclCXX.h"
22	#include "clang/AST/DeclObjC.h"
23	#include "clang/AST/DeclOpenMP.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/NoSanitizeList.h"
29	#include "clang/Basic/ProfileList.h"
30	#include "clang/Basic/StackExhaustionHandler.h"
31	#include "clang/Basic/TargetInfo.h"
32	#include "clang/Basic/XRayLists.h"
33	#include "clang/Lex/PreprocessorOptions.h"
34	#include "llvm/ADT/DenseMap.h"
35	#include "llvm/ADT/MapVector.h"
36	#include "llvm/ADT/SetVector.h"
37	#include "llvm/ADT/SmallPtrSet.h"
38	#include "llvm/ADT/StringMap.h"
39	#include "llvm/IR/Module.h"
40	#include "llvm/IR/ValueHandle.h"
41	#include "llvm/Support/Allocator.h"
42	#include "llvm/Transforms/Utils/SanitizerStats.h"
43	#include <optional>
44
45	namespace llvm {
46	class Module;
47	class Constant;
48	class ConstantInt;
49	class Function;
50	class GlobalValue;
51	class DataLayout;
52	class FunctionType;
53	class LLVMContext;
54	class IndexedInstrProfReader;
55
56	namespace vfs {
57	class FileSystem;
58	}
59
60	namespace abi {
61	class ArgInfo;
62	class IRTypeMapper;
63	class TargetInfo;
64	class TypeBuilder;
65	} // namespace abi
66	}
67
68	namespace clang {
69	class ASTContext;
70	class AtomicType;
71	class FunctionDecl;
72	class IdentifierInfo;
73	class ObjCImplementationDecl;
74	class ObjCEncodeExpr;
75	class BlockExpr;
76	class CharUnits;
77	class Decl;
78	class Expr;
79	class Stmt;
80	class StringLiteral;
81	class NamedDecl;
82	class PointerAuthSchema;
83	class ValueDecl;
84	class VarDecl;
85	class LangOptions;
86	class CodeGenOptions;
87	class HeaderSearchOptions;
88	class DiagnosticsEngine;
89	class AnnotateAttr;
90	class CXXDestructorDecl;
91	class Module;
92	class CoverageSourceInfo;
93	class InitSegAttr;
94
95	namespace CodeGen {
96
97	class CodeGenFunction;
98	class CodeGenTBAA;
99	class CGCXXABI;
100	class CGDebugInfo;
101	class CGObjCRuntime;
102	class CGOpenCLRuntime;
103	class CGOpenMPRuntime;
104	class CGCUDARuntime;
105	class CGHLSLRuntime;
106	class CGFunctionInfo;
107	class CoverageMappingModuleGen;
108	class QualTypeMapper;
109	class TargetCodeGenInfo;
110
111	enum ForDefinition_t : bool {
112	NotForDefinition = false,
113	ForDefinition = true
114	};
115
116	/// The Counter with an optional additional Counter for
117	/// branches. `Skipped` counter can be calculated with `Executed` and
118	/// a common Counter (like `Parent`) as `(Parent-Executed)`.
119	///
120	/// In SingleByte mode, Counters are binary. Subtraction is not
121	/// applicable (but addition is capable). In this case, both
122	/// `Executed` and `Skipped` counters are required. `Skipped` is
123	/// `None` by default. It is allocated in the coverage mapping.
124	///
125	/// There might be cases that `Parent` could be induced with
126	/// `(Executed+Skipped)`. This is not always applicable.
127	class CounterPair {
128	public:
129	/// Optional value.
130	class ValueOpt {
131	private:
132	static constexpr uint32_t None = (`1u` << `31`); /// None is allocated.
133	static constexpr uint32_t Mask = None - `1`;
134
135	uint32_t Val;
136
137	public:
138	ValueOpt() : Val(None) {}
139
140	ValueOpt(unsigned InitVal) {
141	assert(!(InitVal & ~Mask));
142	Val = InitVal;
143	}
144
145	bool hasValue() const { return !(Val & None); }
146
147	operator uint32_t() const { return Val; }
148	};
149
150	ValueOpt Executed;
151	ValueOpt Skipped; /// May be None.
152
153	/// Initialized with Skipped=None.
154	CounterPair(unsigned Val) : Executed (Val) {}
155
156	// FIXME: Should work with {None, None}
157	CounterPair() : Executed (`0`) {}
158	};
159
160	struct OrderGlobalInitsOrStermFinalizers {
161	unsigned int priority;
162	unsigned int lex_order;
163	OrderGlobalInitsOrStermFinalizers(unsigned int p, unsigned int l)
164	: priority(p), lex_order(l) {}
165
166	bool operator==(const OrderGlobalInitsOrStermFinalizers &RHS) const {
167	return priority == RHS.priority && lex_order == RHS.lex_order;
168	}
169
170	bool operator<(const OrderGlobalInitsOrStermFinalizers &RHS) const {
171	return std::tie(args: priority, args: lex_order) <
172	std::tie(args: RHS.priority, args: RHS.lex_order);
173	}
174	};
175
176	struct ObjCEntrypoints {
177	ObjCEntrypoints() { memset(s: this, c: `0`, n: sizeof(*this)); }
178
179	/// void objc_alloc(id);
180	llvm::FunctionCallee objc_alloc;
181
182	/// void objc_allocWithZone(id);
183	llvm::FunctionCallee objc_allocWithZone;
184
185	/// void objc_alloc_init(id);
186	llvm::FunctionCallee objc_alloc_init;
187
188	/// void objc_autoreleasePoolPop(void);*
189	llvm::FunctionCallee objc_autoreleasePoolPop;
190
191	/// void objc_autoreleasePoolPop(void);*
192	/// Note this method is used when we are using exception handling
193	llvm::FunctionCallee objc_autoreleasePoolPopInvoke;
194
195	/// void objc_autoreleasePoolPush(void);*
196	llvm::Function *objc_autoreleasePoolPush;
197
198	/// id objc_autorelease(id);
199	llvm::Function *objc_autorelease;
200
201	/// id objc_autorelease(id);
202	/// Note this is the runtime method not the intrinsic.
203	llvm::FunctionCallee objc_autoreleaseRuntimeFunction;
204
205	/// id objc_autoreleaseReturnValue(id);
206	llvm::Function *objc_autoreleaseReturnValue;
207
208	/// void objc_copyWeak(id dest, id src);
209	llvm::Function *objc_copyWeak;
210
211	/// void objc_destroyWeak(id);*
212	llvm::Function *objc_destroyWeak;
213
214	/// id objc_initWeak(id, id);*
215	llvm::Function *objc_initWeak;
216
217	/// id objc_loadWeak(id);*
218	llvm::Function *objc_loadWeak;
219
220	/// id objc_loadWeakRetained(id);*
221	llvm::Function *objc_loadWeakRetained;
222
223	/// void objc_moveWeak(id dest, id src);
224	llvm::Function *objc_moveWeak;
225
226	/// id objc_retain(id);
227	llvm::Function *objc_retain;
228
229	/// id objc_retain(id);
230	/// Note this is the runtime method not the intrinsic.
231	llvm::FunctionCallee objc_retainRuntimeFunction;
232
233	/// id objc_retainAutorelease(id);
234	llvm::Function *objc_retainAutorelease;
235
236	/// id objc_retainAutoreleaseReturnValue(id);
237	llvm::Function *objc_retainAutoreleaseReturnValue;
238
239	/// id objc_retainAutoreleasedReturnValue(id);
240	llvm::Function *objc_retainAutoreleasedReturnValue;
241
242	/// id objc_retainBlock(id);
243	llvm::Function *objc_retainBlock;
244
245	/// void objc_release(id);
246	llvm::Function *objc_release;
247
248	/// void objc_release(id);
249	/// Note this is the runtime method not the intrinsic.
250	llvm::FunctionCallee objc_releaseRuntimeFunction;
251
252	/// void objc_storeStrong(id, id);*
253	llvm::Function *objc_storeStrong;
254
255	/// id objc_storeWeak(id, id);*
256	llvm::Function *objc_storeWeak;
257
258	/// id objc_unsafeClaimAutoreleasedReturnValue(id);
259	llvm::Function *objc_unsafeClaimAutoreleasedReturnValue;
260
261	/// A void(void) inline asm to use to mark that the return value of
262	/// a call will be immediately retain.
263	llvm::InlineAsm *retainAutoreleasedReturnValueMarker;
264
265	/// void clang.arc.use(...);
266	llvm::Function *clang_arc_use;
267
268	/// void clang.arc.noop.use(...);
269	llvm::Function *clang_arc_noop_use;
270	};
271
272	/// This class records statistics on instrumentation based profiling.
273	class InstrProfStats {
274	uint32_t VisitedInMainFile = `0`;
275	uint32_t MissingInMainFile = `0`;
276	uint32_t Visited = `0`;
277	uint32_t Missing = `0`;
278	uint32_t Mismatched = `0`;
279
280	public:
281	InstrProfStats() = default;
282	/// Record that we've visited a function and whether or not that function was
283	/// in the main source file.
284	void addVisited(bool MainFile) {
285	if (MainFile)
286	++VisitedInMainFile;
287	++Visited;
288	}
289	/// Record that a function we've visited has no profile data.
290	void addMissing(bool MainFile) {
291	if (MainFile)
292	++MissingInMainFile;
293	++Missing;
294	}
295	/// Record that a function we've visited has mismatched profile data.
296	void addMismatched(bool MainFile) { ++Mismatched; }
297	/// Whether or not the stats we've gathered indicate any potential problems.
298	bool hasDiagnostics() { return Missing \|\| Mismatched; }
299	/// Report potential problems we've found to \c Diags.
300	void reportDiagnostics(DiagnosticsEngine &Diags, StringRef MainFile);
301	};
302
303	/// A pair of helper functions for a __block variable.
304	class BlockByrefHelpers : public llvm::FoldingSetNode {
305	// MSVC requires this type to be complete in order to process this
306	// header.
307	public:
308	llvm::Constant *CopyHelper;
309	llvm::Constant *DisposeHelper;
310
311	/// The alignment of the field. This is important because
312	/// different offsets to the field within the byref struct need to
313	/// have different helper functions.
314	CharUnits Alignment;
315
316	BlockByrefHelpers(CharUnits alignment)
317	: CopyHelper(nullptr), DisposeHelper(nullptr), Alignment (alignment) {}
318	BlockByrefHelpers(const BlockByrefHelpers &) = default;
319	virtual ~BlockByrefHelpers();
320
321	void Profile(llvm::FoldingSetNodeID &id) const {
322	id.AddInteger(I: Alignment.getQuantity());
323	profileImpl(id);
324	}
325	virtual void profileImpl(llvm::FoldingSetNodeID &id) const = `0`;
326
327	virtual bool needsCopy() const { return true; }
328	virtual void emitCopy(CodeGenFunction &CGF, Address dest, Address src) = `0`;
329
330	virtual bool needsDispose() const { return true; }
331	virtual void emitDispose(CodeGenFunction &CGF, Address field) = `0`;
332	};
333
334	/// This class organizes the cross-function state that is used while generating
335	/// LLVM code.
336	class CodeGenModule : public CodeGenTypeCache {
337	CodeGenModule(const CodeGenModule &) = delete;
338	void operator=(const CodeGenModule &) = delete;
339
340	public:
341	struct Structor {
342	Structor()
343	: Priority(`0`), LexOrder(~`0u`), Initializer(nullptr),
344	AssociatedData(nullptr) {}
345	Structor(int Priority, unsigned LexOrder, llvm::Constant *Initializer,
346	llvm::Constant *AssociatedData)
347	: Priority(Priority), LexOrder(LexOrder), Initializer(Initializer),
348	AssociatedData(AssociatedData) {}
349	int Priority;
350	unsigned LexOrder;
351	llvm::Constant *Initializer;
352	llvm::Constant *AssociatedData;
353	};
354
355	typedef std::vector<Structor> CtorList;
356
357	private:
358	ASTContext &Context;
359	const LangOptions &LangOpts;
360	IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS; // Only used for debug info.
361	const HeaderSearchOptions &HeaderSearchOpts; // Only used for debug info.
362	const PreprocessorOptions &PreprocessorOpts; // Only used for debug info.
363	const CodeGenOptions &CodeGenOpts;
364	unsigned NumAutoVarInit = `0`;
365	llvm::Module &TheModule;
366	DiagnosticsEngine &Diags;
367	const TargetInfo &Target;
368	std::unique_ptr<CGCXXABI> ABI;
369	llvm::LLVMContext &VMContext;
370	std::string ModuleNameHash;
371	bool CXX20ModuleInits = false;
372	std::unique_ptr<CodeGenTBAA> TBAA;
373
374	mutable std::unique_ptr<TargetCodeGenInfo> TheTargetCodeGenInfo;
375
376	/// Cached LLVMABI target lowering info, lazily constructed when the
377	/// experimental ABI lowering path is taken.
378	mutable std::unique_ptr<llvm::abi::TargetInfo> TheLLVMABITargetInfo;
379
380	/// Allocator and mappers used by the experimental LLVMABI-based lowering
381	/// path (gated on -fexperimental-abi-lowering). Constructed unconditionally
382	/// so the path can be entered without re-checking initialization, but the
383	/// caches stay empty when the flag is off.
384	llvm::BumpPtrAllocator AbiAlloc;
385	std::unique_ptr<QualTypeMapper> AbiMapper;
386	std::unique_ptr<llvm::abi::IRTypeMapper> AbiReverseMapper;
387
388	// This should not be moved earlier, since its initialization depends on some
389	// of the previous reference members being already initialized and also checks
390	// if TheTargetCodeGenInfo is NULL
391	std::unique_ptr<CodeGenTypes> Types;
392
393	/// Holds information about C++ vtables.
394	CodeGenVTables VTables;
395
396	std::unique_ptr<CGObjCRuntime> ObjCRuntime;
397	std::unique_ptr<CGOpenCLRuntime> OpenCLRuntime;
398	std::unique_ptr<CGOpenMPRuntime> OpenMPRuntime;
399	std::unique_ptr<CGCUDARuntime> CUDARuntime;
400	std::unique_ptr<CGHLSLRuntime> HLSLRuntime;
401	std::unique_ptr<CGDebugInfo> DebugInfo;
402	std::unique_ptr<ObjCEntrypoints> ObjCData;
403	llvm::MDNode NoObjCARCExceptionsMetadata = nullptr*;
404	std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader;
405	InstrProfStats PGOStats;
406	std::unique_ptr<llvm::SanitizerStatReport> SanStats;
407	StackExhaustionHandler StackHandler;
408
409	// A set of references that have only been seen via a weakref so far. This is
410	// used to remove the weak of the reference if we ever see a direct reference
411	// or a definition.
412	llvm::SmallPtrSet<llvm::GlobalValue*, `10`> WeakRefReferences;
413
414	/// This contains all the decls which have definitions but/ which are deferred
415	/// for emission and therefore should only be output if they are actually
416	/// used. If a decl is in this, then it is known to have not been referenced
417	/// yet.
418	llvm::DenseMap<StringRef, GlobalDecl> DeferredDecls;
419
420	llvm::StringSet<llvm::BumpPtrAllocator> DeferredResolversToEmit;
421
422	/// This is a list of deferred decls which we have seen that are* actually*
423	/// referenced. These get code generated when the module is done.
424	std::vector<GlobalDecl> DeferredDeclsToEmit;
425	void addDeferredDeclToEmit(GlobalDecl GD) {
426	DeferredDeclsToEmit.emplace_back(args&: GD);
427	addEmittedDeferredDecl(GD);
428	}
429
430	/// Decls that were DeferredDecls and have now been emitted.
431	llvm::DenseMap<llvm::StringRef, GlobalDecl> EmittedDeferredDecls;
432
433	void addEmittedDeferredDecl(GlobalDecl GD) {
434	// Reemission is only needed in incremental mode.
435	if (!Context.getLangOpts().IncrementalExtensions)
436	return;
437
438	// Assume a linkage by default that does not need reemission.
439	auto L = llvm::GlobalValue::ExternalLinkage;
440	if (llvm::isa<FunctionDecl>(Val: GD.getDecl()))
441	L = getFunctionLinkage(GD);
442	else if (auto *VD = llvm::dyn_cast<VarDecl>(Val: GD.getDecl()))
443	L = getLLVMLinkageVarDefinition(VD);
444
445	if (llvm::GlobalValue::isInternalLinkage(Linkage: L) \|\|
446	llvm::GlobalValue::isLinkOnceLinkage(Linkage: L) \|\|
447	llvm::GlobalValue::isWeakLinkage(Linkage: L)) {
448	EmittedDeferredDecls [getMangledName(GD)] = GD;
449	}
450	}
451
452	/// List of alias we have emitted. Used to make sure that what they point to
453	/// is defined once we get to the end of the of the translation unit.
454	std::vector<GlobalDecl> Aliases;
455
456	/// List of multiversion functions to be emitted. This list is processed in
457	/// conjunction with other deferred symbols and is used to ensure that
458	/// multiversion function resolvers and ifuncs are defined and emitted.
459	std::vector<GlobalDecl> MultiVersionFuncs;
460
461	llvm::MapVector<StringRef, llvm::TrackingVH<llvm::Constant>> Replacements;
462
463	/// List of global values to be replaced with something else. Used when we
464	/// want to replace a GlobalValue but can't identify it by its mangled name
465	/// anymore (because the name is already taken).
466	llvm::SmallVector<std::pair<llvm::GlobalValue , llvm::Constant >, `8`>
467	GlobalValReplacements;
468
469	/// Variables for which we've emitted globals containing their constant
470	/// values along with the corresponding globals, for opportunistic reuse.
471	llvm::DenseMap<const VarDecl, llvm::GlobalVariable> InitializerConstants;
472
473	/// Set of global decls for which we already diagnosed mangled name conflict.
474	/// Required to not issue a warning (on a mangling conflict) multiple times
475	/// for the same decl.
476	llvm::DenseSet<GlobalDecl> DiagnosedConflictingDefinitions;
477
478	/// A queue of (optional) vtables to consider emitting.
479	std::vector<const CXXRecordDecl*> DeferredVTables;
480
481	/// In incremental compilation, the set of vtable classes whose vtable
482	/// definitions were emitted into a previous PTU's module. Carried forward
483	/// by moveLazyEmissionStates() so later PTUs skip re-defining them.
484	llvm::SmallPtrSet<const CXXRecordDecl *, `8`> EmittedVTables;
485
486	/// A queue of (optional) vtables that may be emitted opportunistically.
487	std::vector<const CXXRecordDecl *> OpportunisticVTables;
488
489	/// List of global values which are required to be present in the object file;
490	/// bitcast to i8. This is used for forcing visibility of symbols which may*
491	/// otherwise be optimized out.
492	std::vector<llvm::WeakTrackingVH> LLVMUsed;
493	std::vector<llvm::WeakTrackingVH> LLVMCompilerUsed;
494
495	/// Store the list of global constructors and their respective priorities to
496	/// be emitted when the translation unit is complete.
497	CtorList GlobalCtors;
498
499	/// Store the list of global destructors and their respective priorities to be
500	/// emitted when the translation unit is complete.
501	CtorList GlobalDtors;
502
503	/// An ordered map of canonical GlobalDecls to their mangled names.
504	llvm::MapVector<GlobalDecl, StringRef> MangledDeclNames;
505	llvm::StringMap<GlobalDecl, llvm::BumpPtrAllocator> Manglings;
506
507	/// Global annotations.
508	std::vector<llvm::Constant*> Annotations;
509
510	// Store deferred function annotations so they can be emitted at the end with
511	// most up to date ValueDecl that will have all the inherited annotations.
512	llvm::MapVector<StringRef, const ValueDecl *> DeferredAnnotations;
513
514	/// Map used to get unique annotation strings.
515	llvm::StringMap<llvm::Constant*> AnnotationStrings;
516
517	/// Used for uniquing of annotation arguments.
518	llvm::DenseMap<unsigned, llvm::Constant *> AnnotationArgs;
519
520	llvm::StringMap<llvm::GlobalVariable *> CFConstantStringMap;
521
522	llvm::DenseMap<llvm::Constant , llvm::GlobalVariable > ConstantStringMap;
523	llvm::DenseMap<const UnnamedGlobalConstantDecl , llvm::GlobalVariable >
524	UnnamedGlobalConstantDeclMap;
525	llvm::DenseMap<const Decl, llvm::Constant > StaticLocalDeclMap;
526	llvm::DenseMap<const Decl, llvm::GlobalVariable> StaticLocalDeclGuardMap;
527	llvm::DenseMap<const Expr, llvm::Constant > MaterializedGlobalTemporaryMap;
528
529	llvm::DenseMap<QualType, llvm::Constant *> AtomicSetterHelperFnMap;
530	llvm::DenseMap<QualType, llvm::Constant *> AtomicGetterHelperFnMap;
531
532	/// Map used to get unique type descriptor constants for sanitizers.
533	llvm::DenseMap<QualType, llvm::Constant *> TypeDescriptorMap;
534
535	/// Map used to track internal linkage functions declared within
536	/// extern "C" regions.
537	typedef llvm::MapVector<IdentifierInfo *,
538	llvm::GlobalValue *> StaticExternCMap;
539	StaticExternCMap StaticExternCValues;
540
541	/// thread_local variables defined or used in this TU.
542	std::vector<const VarDecl *> CXXThreadLocals;
543
544	/// thread_local variables with initializers that need to run
545	/// before any thread_local variable in this TU is odr-used.
546	std::vector<llvm::Function *> CXXThreadLocalInits;
547	std::vector<const VarDecl *> CXXThreadLocalInitVars;
548
549	/// Global variables with initializers that need to run before main.
550	std::vector<llvm::Function *> CXXGlobalInits;
551
552	/// When a C++ decl with an initializer is deferred, null is
553	/// appended to CXXGlobalInits, and the index of that null is placed
554	/// here so that the initializer will be performed in the correct
555	/// order. Once the decl is emitted, the index is replaced with ~0U to ensure
556	/// that we don't re-emit the initializer.
557	llvm::DenseMap<const Decl, unsigned*> DelayedCXXInitPosition;
558
559	/// To remember which types did require a vector deleting destructor body.
560	/// This set basically contains classes that have virtual destructor and new[]
561	/// was emitted for the class.
562	llvm::SmallPtrSet<const CXXRecordDecl *, `16`> RequireVectorDeletingDtor;
563
564	typedef std::pair<OrderGlobalInitsOrStermFinalizers, llvm::Function *>
565	GlobalInitData;
566
567	// When a tail call is performed on an "undefined" symbol, on PPC without pc
568	// relative feature, the tail call is not allowed. In "EmitCall" for such
569	// tail calls, the "undefined" symbols may be forward declarations, their
570	// definitions are provided in the module after the callsites. For such tail
571	// calls, diagnose message should not be emitted.
572	llvm::SmallSetVector<std::pair<const FunctionDecl *, SourceLocation>, `4`>
573	MustTailCallUndefinedGlobals;
574
575	struct GlobalInitPriorityCmp {
576	bool operator()(const GlobalInitData &LHS,
577	const GlobalInitData &RHS) const {
578	return LHS.first.priority < RHS.first.priority;
579	}
580	};
581
582	/// Global variables with initializers whose order of initialization is set by
583	/// init_priority attribute.
584	SmallVector<GlobalInitData, `8`> PrioritizedCXXGlobalInits;
585
586	/// Global destructor functions and arguments that need to run on termination.
587	/// When UseSinitAndSterm is set, it instead contains sterm finalizer
588	/// functions, which also run on unloading a shared library.
589	typedef std::tuple<llvm::FunctionType *, llvm::WeakTrackingVH,
590	llvm::Constant *>
591	CXXGlobalDtorsOrStermFinalizer_t;
592	SmallVector<CXXGlobalDtorsOrStermFinalizer_t, `8`>
593	CXXGlobalDtorsOrStermFinalizers;
594
595	typedef std::pair<OrderGlobalInitsOrStermFinalizers, llvm::Function *>
596	StermFinalizerData;
597
598	struct StermFinalizerPriorityCmp {
599	bool operator()(const StermFinalizerData &LHS,
600	const StermFinalizerData &RHS) const {
601	return LHS.first.priority < RHS.first.priority;
602	}
603	};
604
605	/// Global variables with sterm finalizers whose order of initialization is
606	/// set by init_priority attribute.
607	SmallVector<StermFinalizerData, `8`> PrioritizedCXXStermFinalizers;
608
609	/// The complete set of modules that has been imported.
610	llvm::SetVector<clang::Module *> ImportedModules;
611
612	/// The set of modules for which the module initializers
613	/// have been emitted.
614	llvm::SmallPtrSet<clang::Module *, `16`> EmittedModuleInitializers;
615
616	/// A vector of metadata strings for linker options.
617	SmallVector<llvm::MDNode *, `16`> LinkerOptionsMetadata;
618
619	/// A vector of metadata strings for dependent libraries for ELF.
620	SmallVector<llvm::MDNode *, `16`> ELFDependentLibraries;
621
622	/// Global variable for copyright pragma comment (if present).
623	llvm::GlobalVariable LoadTimeCommentGlobal = nullptr*;
624
625	/// @name Cache for Objective-C runtime types
626	/// @{
627
628	/// Cached reference to the class for constant strings. This value has type
629	/// int but is actually an Obj-C class pointer.*
630	llvm::WeakTrackingVH CFConstantStringClassRef;
631
632	/// The type used to describe the state of a fast enumeration in
633	/// Objective-C's for..in loop.
634	QualType ObjCFastEnumerationStateType;
635
636	/// @}
637
638	/// Lazily create the Objective-C runtime
639	void createObjCRuntime();
640
641	void createOpenCLRuntime();
642	void createOpenMPRuntime();
643	void createCUDARuntime();
644	void createHLSLRuntime();
645
646	bool shouldEmitFunction(GlobalDecl GD);
647	// Whether a global variable should be emitted by CUDA/HIP host/device
648	// related attributes.
649	bool shouldEmitCUDAGlobalVar(const VarDecl VD) const*;
650	bool shouldOpportunisticallyEmitVTables();
651	/// Map used to be sure we don't emit the same CompoundLiteral twice.
652	llvm::DenseMap<const CompoundLiteralExpr , llvm::GlobalVariable >
653	EmittedCompoundLiterals;
654
655	/// Map of the global blocks we've emitted, so that we don't have to re-emit
656	/// them if the constexpr evaluator gets aggressive.
657	llvm::DenseMap<const BlockExpr , llvm::Constant > EmittedGlobalBlocks;
658
659	/// @name Cache for Blocks Runtime Globals
660	/// @{
661
662	llvm::Constant NSConcreteGlobalBlock = nullptr*;
663	llvm::Constant NSConcreteStackBlock = nullptr*;
664
665	llvm::FunctionCallee BlockObjectAssign = nullptr;
666	llvm::FunctionCallee BlockObjectDispose = nullptr;
667
668	llvm::Type BlockDescriptorType = nullptr*;
669	llvm::Type GenericBlockLiteralType = nullptr*;
670
671	struct {
672	int GlobalUniqueCount;
673	} Block;
674
675	GlobalDecl initializedGlobalDecl;
676
677	/// @}
678
679	/// void @llvm.lifetime.start(i64 %size, i8 nocapture <ptr>)*
680	llvm::Function LifetimeStartFn = nullptr*;
681
682	/// void @llvm.lifetime.end(i64 %size, i8 nocapture <ptr>)*
683	llvm::Function LifetimeEndFn = nullptr*;
684
685	/// void @llvm.fake.use(...)
686	llvm::Function FakeUseFn = nullptr*;
687
688	std::unique_ptr<SanitizerMetadata> SanitizerMD;
689
690	llvm::MapVector<const Decl , bool*> DeferredEmptyCoverageMappingDecls;
691
692	std::unique_ptr<CoverageMappingModuleGen> CoverageMapping;
693
694	/// Mapping from canonical types to their metadata identifiers. We need to
695	/// maintain this mapping because identifiers may be formed from distinct
696	/// MDNodes.
697	typedef llvm::DenseMap<QualType, llvm::Metadata *> MetadataTypeMap;
698	MetadataTypeMap MetadataIdMap;
699	MetadataTypeMap VirtualMetadataIdMap;
700	MetadataTypeMap GeneralizedMetadataIdMap;
701
702	// Helps squashing blocks of TopLevelStmtDecl into a single llvm::Function
703	// when used with -fincremental-extensions.
704	std::pair<std::unique_ptr<CodeGenFunction>, const TopLevelStmtDecl *>
705	GlobalTopLevelStmtBlockInFlight;
706
707	llvm::DenseMap<GlobalDecl, uint16_t> PtrAuthDiscriminatorHashes;
708
709	llvm::DenseMap<const CXXRecordDecl *, std::optional<PointerAuthQualifier>>
710	VTablePtrAuthInfos;
711	std::optional<PointerAuthQualifier>
712	computeVTPointerAuthentication(const CXXRecordDecl *ThisClass);
713
714	AtomicOptions AtomicOpts;
715
716	// A set of functions which should be hot-patched; see
717	// -fms-hotpatch-functions-file (and -list). This will nearly always be empty.
718	// The list is sorted for binary-searching.
719	std::vector<std::string> MSHotPatchFunctions;
720
721	public:
722	CodeGenModule(ASTContext &C, IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS,
723	const HeaderSearchOptions &headersearchopts,
724	const PreprocessorOptions &ppopts,
725	const CodeGenOptions &CodeGenOpts, llvm::Module &M,
726	DiagnosticsEngine &Diags,
727	CoverageSourceInfo CoverageInfo = nullptr*);
728
729	~CodeGenModule();
730
731	void clear();
732
733	/// Finalize LLVM code generation.
734	void Release();
735
736	/// Get the current Atomic options.
737	AtomicOptions getAtomicOpts() { return AtomicOpts; }
738
739	/// Set the current Atomic options.
740	void setAtomicOpts(AtomicOptions AO) { AtomicOpts = AO; }
741
742	/// Return true if we should emit location information for expressions.
743	bool getExpressionLocationsEnabled() const;
744
745	/// Return a reference to the configured Objective-C runtime.
746	CGObjCRuntime &getObjCRuntime() {
747	if (!ObjCRuntime) createObjCRuntime();
748	return *ObjCRuntime;
749	}
750
751	/// Return true iff an Objective-C runtime has been configured.
752	bool hasObjCRuntime() { return !!ObjCRuntime; }
753
754	/// Check if the precondition thunk optimization is enabled.
755	/// This checks runtime support and codegen options, but does NOT check
756	/// whether a specific method is eligible for thunks or inline preconditions.
757	///
758	/// TODO: Add support for GNUStep as well, currently only supports NeXT
759	/// family.
760	bool isObjCDirectPreconditionThunkEnabled() const {
761	return getLangOpts().ObjCRuntime.allowsDirectDispatch() &&
762	getLangOpts().ObjCRuntime.isNeXTFamily() &&
763	getCodeGenOpts().ObjCDirectPreconditionThunk;
764	}
765
766	/// Check if a direct method should use precondition thunks at call sites.
767	/// Returns false if OMD is null, not a direct method, or variadic.
768	///
769	/// Variadic methods use inline preconditions instead of thunks to avoid
770	/// musttail complexity across different architectures.
771	bool shouldHavePreconditionThunk(const ObjCMethodDecl OMD) const* {
772	return OMD && OMD->isDirectMethod() && !OMD->isVariadic() &&
773	isObjCDirectPreconditionThunkEnabled();
774	}
775
776	/// Check if a direct method should have inline precondition checks at call
777	/// sites.
778	/// Returns false if OMD is null, not a direct method, or not variadic.
779	///
780	/// Variadic direct methods use inline preconditions rather than thunks
781	/// to avoid musttail complexity across different architectures.
782	bool shouldHavePreconditionInline(const ObjCMethodDecl OMD) const* {
783	return OMD && OMD->isDirectMethod() && OMD->isVariadic() &&
784	isObjCDirectPreconditionThunkEnabled();
785	}
786
787	const std::string &getModuleNameHash() const { return ModuleNameHash; }
788
789	/// Return a reference to the configured OpenCL runtime.
790	CGOpenCLRuntime &getOpenCLRuntime() {
791	assert(OpenCLRuntime != nullptr);
792	return *OpenCLRuntime;
793	}
794
795	/// Return a reference to the configured OpenMP runtime.
796	CGOpenMPRuntime &getOpenMPRuntime() {
797	assert(OpenMPRuntime != nullptr);
798	return *OpenMPRuntime;
799	}
800
801	/// Return a reference to the configured CUDA runtime.
802	CGCUDARuntime &getCUDARuntime() {
803	assert(CUDARuntime != nullptr);
804	return *CUDARuntime;
805	}
806
807	/// Return a reference to the configured HLSL runtime.
808	CGHLSLRuntime &getHLSLRuntime() {
809	assert(HLSLRuntime != nullptr);
810	return *HLSLRuntime;
811	}
812
813	ObjCEntrypoints &getObjCEntrypoints() const {
814	assert(ObjCData != nullptr);
815	return *ObjCData;
816	}
817
818	// Version checking functions, used to implement ObjC's @available:
819	// i32 @__isOSVersionAtLeast(i32, i32, i32)
820	llvm::FunctionCallee IsOSVersionAtLeastFn = nullptr;
821	// i32 @__isPlatformVersionAtLeast(i32, i32, i32, i32)
822	llvm::FunctionCallee IsPlatformVersionAtLeastFn = nullptr;
823
824	InstrProfStats &getPGOStats() { return PGOStats; }
825	llvm::IndexedInstrProfReader getPGOReader() const* { return PGOReader.get(); }
826
827	CoverageMappingModuleGen getCoverageMapping() const* {
828	return CoverageMapping.get();
829	}
830
831	llvm::Constant getStaticLocalDeclAddress(const* VarDecl *D) {
832	return StaticLocalDeclMap [D];
833	}
834	void setStaticLocalDeclAddress(const VarDecl *D,
835	llvm::Constant *C) {
836	StaticLocalDeclMap [D] = C;
837	}
838
839	llvm::Constant *
840	getOrCreateStaticVarDecl(const VarDecl &D,
841	llvm::GlobalValue::LinkageTypes Linkage);
842
843	llvm::GlobalVariable getStaticLocalDeclGuardAddress(const* VarDecl *D) {
844	return StaticLocalDeclGuardMap [D];
845	}
846	void setStaticLocalDeclGuardAddress(const VarDecl *D,
847	llvm::GlobalVariable *C) {
848	StaticLocalDeclGuardMap [D] = C;
849	}
850
851	Address createUnnamedGlobalFrom(const VarDecl &D, llvm::Constant *Constant,
852	CharUnits Align);
853
854	bool lookupRepresentativeDecl(StringRef MangledName,
855	GlobalDecl &Result) const;
856
857	llvm::Constant *getAtomicSetterHelperFnMap(QualType Ty) {
858	return AtomicSetterHelperFnMap [Ty];
859	}
860	void setAtomicSetterHelperFnMap(QualType Ty,
861	llvm::Constant *Fn) {
862	AtomicSetterHelperFnMap [Ty] = Fn;
863	}
864
865	llvm::Constant *getAtomicGetterHelperFnMap(QualType Ty) {
866	return AtomicGetterHelperFnMap [Ty];
867	}
868	void setAtomicGetterHelperFnMap(QualType Ty,
869	llvm::Constant *Fn) {
870	AtomicGetterHelperFnMap [Ty] = Fn;
871	}
872
873	llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
874	return TypeDescriptorMap [Ty];
875	}
876	void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
877	TypeDescriptorMap [Ty] = C;
878	}
879
880	CGDebugInfo getModuleDebugInfo() { return* DebugInfo.get(); }
881
882	llvm::MDNode *getNoObjCARCExceptionsMetadata() {
883	if (!NoObjCARCExceptionsMetadata)
884	NoObjCARCExceptionsMetadata = llvm::MDNode::get(Context&: getLLVMContext(), MDs: {});
885	return NoObjCARCExceptionsMetadata;
886	}
887
888	ASTContext &getContext() const { return Context; }
889	const LangOptions &getLangOpts() const { return LangOpts; }
890	const IntrusiveRefCntPtr<llvm::vfs::FileSystem> &getFileSystem() const {
891	return FS;
892	}
893	const HeaderSearchOptions &getHeaderSearchOpts()
894	const { return HeaderSearchOpts; }
895	const PreprocessorOptions &getPreprocessorOpts()
896	const { return PreprocessorOpts; }
897	const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
898	llvm::Module &getModule() const { return TheModule; }
899	DiagnosticsEngine &getDiags() const { return Diags; }
900	const llvm::DataLayout &getDataLayout() const {
901	return TheModule.getDataLayout();
902	}
903	const TargetInfo &getTarget() const { return Target; }
904	const llvm::Triple &getTriple() const { return Target.getTriple(); }
905	bool supportsCOMDAT() const;
906	void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO);
907
908	const ABIInfo &getABIInfo();
909
910	/// Lazily build and return the LLVMABI library's TargetInfo for the current
911	/// target. Used by the experimental ABI lowering path
912	/// (-fexperimental-abi-lowering).
913	const llvm::abi::TargetInfo &getLLVMABITargetInfo(llvm::abi::TypeBuilder &TB);
914
915	/// True when -fexperimental-abi-lowering is in effect AND the active target
916	/// has an LLVMABI implementation we can route to.
917	bool shouldUseLLVMABILowering() const;
918
919	/// Drive the experimental LLVMABI-based lowering path: map argument and
920	/// return types into the LLVMABI library, ask its target lowering to fill
921	/// in classification, and write the results back into FI.
922	void computeABIInfoUsingLib(CGFunctionInfo &FI);
923
924	CGCXXABI &getCXXABI() const { return *ABI; }
925	llvm::LLVMContext &getLLVMContext() { return VMContext; }
926
927	bool shouldUseTBAA() const { return TBAA != nullptr; }
928
929	const TargetCodeGenInfo &getTargetCodeGenInfo();
930
931	CodeGenTypes &getTypes() { return *Types; }
932
933	CodeGenVTables &getVTables() { return VTables; }
934
935	ItaniumVTableContext &getItaniumVTableContext() {
936	return VTables.getItaniumVTableContext();
937	}
938
939	const ItaniumVTableContext &getItaniumVTableContext() const {
940	return VTables.getItaniumVTableContext();
941	}
942
943	MicrosoftVTableContext &getMicrosoftVTableContext() {
944	return VTables.getMicrosoftVTableContext();
945	}
946
947	CtorList &getGlobalCtors() { return GlobalCtors; }
948	CtorList &getGlobalDtors() { return GlobalDtors; }
949
950	/// getTBAATypeInfo - Get metadata used to describe accesses to objects of
951	/// the given type.
952	llvm::MDNode *getTBAATypeInfo(QualType QTy);
953
954	/// getTBAAAccessInfo - Get TBAA information that describes an access to
955	/// an object of the given type.
956	TBAAAccessInfo getTBAAAccessInfo(QualType AccessType);
957
958	/// getTBAAVTablePtrAccessInfo - Get the TBAA information that describes an
959	/// access to a virtual table pointer.
960	TBAAAccessInfo getTBAAVTablePtrAccessInfo(llvm::Type *VTablePtrType);
961
962	llvm::MDNode *getTBAAStructInfo(QualType QTy);
963
964	/// getTBAABaseTypeInfo - Get metadata that describes the given base access
965	/// type. Return null if the type is not suitable for use in TBAA access tags.
966	llvm::MDNode *getTBAABaseTypeInfo(QualType QTy);
967
968	/// getTBAAAccessTagInfo - Get TBAA tag for a given memory access.
969	llvm::MDNode *getTBAAAccessTagInfo(TBAAAccessInfo Info);
970
971	/// mergeTBAAInfoForCast - Get merged TBAA information for the purposes of
972	/// type casts.
973	TBAAAccessInfo mergeTBAAInfoForCast(TBAAAccessInfo SourceInfo,
974	TBAAAccessInfo TargetInfo);
975
976	/// mergeTBAAInfoForConditionalOperator - Get merged TBAA information for the
977	/// purposes of conditional operator.
978	TBAAAccessInfo mergeTBAAInfoForConditionalOperator(TBAAAccessInfo InfoA,
979	TBAAAccessInfo InfoB);
980
981	/// mergeTBAAInfoForMemoryTransfer - Get merged TBAA information for the
982	/// purposes of memory transfer calls.
983	TBAAAccessInfo mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo,
984	TBAAAccessInfo SrcInfo);
985
986	/// getTBAAInfoForSubobject - Get TBAA information for an access with a given
987	/// base lvalue.
988	TBAAAccessInfo getTBAAInfoForSubobject(LValue Base, QualType AccessType) {
989	if (Base.getTBAAInfo().isMayAlias())
990	return TBAAAccessInfo::getMayAliasInfo();
991	return getTBAAAccessInfo(AccessType);
992	}
993
994	bool isPaddedAtomicType(QualType type);
995	bool isPaddedAtomicType(const AtomicType *type);
996
997	/// DecorateInstructionWithTBAA - Decorate the instruction with a TBAA tag.
998	void DecorateInstructionWithTBAA(llvm::Instruction *Inst,
999	TBAAAccessInfo TBAAInfo);
1000
1001	/// Adds !invariant.barrier !tag to instruction
1002	void DecorateInstructionWithInvariantGroup(llvm::Instruction *I,
1003	const CXXRecordDecl *RD);
1004
1005	/// Emit the given number of characters as a value of type size_t.
1006	llvm::ConstantInt *getSize(CharUnits numChars);
1007
1008	/// Set the visibility for the given LLVM GlobalValue.
1009	void setGlobalVisibility(llvm::GlobalValue GV, const* NamedDecl D) const*;
1010
1011	void setDSOLocal(llvm::GlobalValue GV) const*;
1012
1013	bool shouldMapVisibilityToDLLExport(const NamedDecl D) const* {
1014	return getLangOpts().hasDefaultVisibilityExportMapping() && D &&
1015	(D->getLinkageAndVisibility().getVisibility() ==
1016	DefaultVisibility) &&
1017	(getLangOpts().isAllDefaultVisibilityExportMapping() \|\|
1018	(getLangOpts().isExplicitDefaultVisibilityExportMapping() &&
1019	D->getLinkageAndVisibility().isVisibilityExplicit()));
1020	}
1021	void setDLLImportDLLExport(llvm::GlobalValue GV, GlobalDecl D) const*;
1022	void setDLLImportDLLExport(llvm::GlobalValue GV, const* NamedDecl D) const*;
1023	/// Set visibility, dllimport/dllexport and dso_local.
1024	/// This must be called after dllimport/dllexport is set.
1025	void setGVProperties(llvm::GlobalValue GV, GlobalDecl GD) const*;
1026	void setGVProperties(llvm::GlobalValue GV, const* NamedDecl D) const*;
1027
1028	void setGVPropertiesAux(llvm::GlobalValue GV, const* NamedDecl D) const*;
1029
1030	/// Set the TLS mode for the given LLVM GlobalValue for the thread-local
1031	/// variable declaration D.
1032	void setTLSMode(llvm::GlobalValue GV, const* VarDecl &D) const;
1033
1034	/// Get LLVM TLS mode from CodeGenOptions.
1035	llvm::GlobalVariable::ThreadLocalMode GetDefaultLLVMTLSModel() const;
1036
1037	static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V) {
1038	switch (V) {
1039	case DefaultVisibility: return llvm::GlobalValue::DefaultVisibility;
1040	case HiddenVisibility: return llvm::GlobalValue::HiddenVisibility;
1041	case ProtectedVisibility: return llvm::GlobalValue::ProtectedVisibility;
1042	}
1043	llvm_unreachable("unknown visibility!");
1044	}
1045
1046	llvm::Constant *GetAddrOfGlobal(GlobalDecl GD,
1047	ForDefinition_t IsForDefinition
1048	= NotForDefinition);
1049
1050	/// Will return a global variable of the given type. If a variable with a
1051	/// different type already exists then a new variable with the right type
1052	/// will be created and all uses of the old variable will be replaced with a
1053	/// bitcast to the new variable.
1054	llvm::GlobalVariable *
1055	CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty,
1056	llvm::GlobalValue::LinkageTypes Linkage,
1057	llvm::Align Alignment);
1058
1059	llvm::Function *CreateGlobalInitOrCleanUpFunction(
1060	llvm::FunctionType ty, const* Twine &name, const CGFunctionInfo &FI,
1061	SourceLocation Loc = SourceLocation (), bool TLS = false,
1062	llvm::GlobalVariable::LinkageTypes Linkage =
1063	llvm::GlobalVariable::InternalLinkage);
1064
1065	/// Return the AST address space of the underlying global variable for D, as
1066	/// determined by its declaration. Normally this is the same as the address
1067	/// space of D's type, but in CUDA, address spaces are associated with
1068	/// declarations, not types. If D is nullptr, return the default address
1069	/// space for global variable.
1070	///
1071	/// For languages without explicit address spaces, if D has default address
1072	/// space, target-specific global or constant address space may be returned.
1073	LangAS GetGlobalVarAddressSpace(const VarDecl *D);
1074
1075	/// Return the AST address space of constant literal, which is used to emit
1076	/// the constant literal as global variable in LLVM IR.
1077	/// Note: This is not necessarily the address space of the constant literal
1078	/// in AST. For address space agnostic language, e.g. C++, constant literal
1079	/// in AST is always in default address space.
1080	LangAS GetGlobalConstantAddressSpace() const;
1081
1082	/// Return the llvm::Constant for the address of the given global variable.
1083	/// If Ty is non-null and if the global doesn't exist, then it will be created
1084	/// with the specified type instead of whatever the normal requested type
1085	/// would be. If IsForDefinition is true, it is guaranteed that an actual
1086	/// global with type Ty will be returned, not conversion of a variable with
1087	/// the same mangled name but some other type.
1088	llvm::Constant GetAddrOfGlobalVar(const* VarDecl *D,
1089	llvm::Type Ty = nullptr*,
1090	ForDefinition_t IsForDefinition
1091	= NotForDefinition);
1092
1093	/// Return the address of the given function. If Ty is non-null, then this
1094	/// function will use the specified type if it has to create it.
1095	llvm::Constant GetAddrOfFunction(GlobalDecl GD, llvm::Type Ty = nullptr,
1096	bool ForVTable = false,
1097	bool DontDefer = false,
1098	ForDefinition_t IsForDefinition
1099	= NotForDefinition);
1100
1101	// Return the function body address of the given function.
1102	llvm::Constant GetFunctionStart(const* ValueDecl *Decl);
1103
1104	/// Return a function pointer for a reference to the given function.
1105	/// This correctly handles weak references, but does not apply a
1106	/// pointer signature.
1107	llvm::Constant *getRawFunctionPointer(GlobalDecl GD,
1108	llvm::Type Ty = nullptr*);
1109
1110	/// Return the ABI-correct function pointer value for a reference
1111	/// to the given function. This will apply a pointer signature if
1112	/// necessary, caching the result for the given function.
1113	llvm::Constant getFunctionPointer(GlobalDecl GD, llvm::Type Ty = nullptr);
1114
1115	/// Return the ABI-correct function pointer value for a reference
1116	/// to the given function. This will apply a pointer signature if
1117	/// necessary.
1118	llvm::Constant getFunctionPointer(llvm::Constant Pointer,
1119	QualType FunctionType);
1120
1121	llvm::Constant getMemberFunctionPointer(const* FunctionDecl *FD,
1122	llvm::Type Ty = nullptr*);
1123
1124	llvm::Constant getMemberFunctionPointer(llvm::Constant Pointer,
1125	QualType FT);
1126
1127	CGPointerAuthInfo getFunctionPointerAuthInfo(QualType T);
1128
1129	CGPointerAuthInfo getMemberFunctionPointerAuthInfo(QualType FT);
1130
1131	CGPointerAuthInfo getPointerAuthInfoForPointeeType(QualType type);
1132
1133	CGPointerAuthInfo getPointerAuthInfoForType(QualType type);
1134
1135	bool shouldSignPointer(const PointerAuthSchema &Schema);
1136	llvm::Constant getConstantSignedPointer(llvm::Constant Pointer,
1137	const PointerAuthSchema &Schema,
1138	llvm::Constant *StorageAddress,
1139	GlobalDecl SchemaDecl,
1140	QualType SchemaType);
1141
1142	llvm::Constant *
1143	getConstantSignedPointer(llvm::Constant Pointer, unsigned* Key,
1144	llvm::Constant *StorageAddress,
1145	llvm::ConstantInt *OtherDiscriminator);
1146
1147	llvm::ConstantInt *
1148	getPointerAuthOtherDiscriminator(const PointerAuthSchema &Schema,
1149	GlobalDecl SchemaDecl, QualType SchemaType);
1150
1151	uint16_t getPointerAuthDeclDiscriminator(GlobalDecl GD);
1152	std::optional<CGPointerAuthInfo>
1153	getVTablePointerAuthInfo(CodeGenFunction *Context,
1154	const CXXRecordDecl *Record,
1155	llvm::Value *StorageAddress);
1156
1157	std::optional<PointerAuthQualifier>
1158	getVTablePointerAuthentication(const CXXRecordDecl *thisClass);
1159
1160	CGPointerAuthInfo EmitPointerAuthInfo(const RecordDecl *RD);
1161
1162	// Return whether RTTI information should be emitted for this target.
1163	bool shouldEmitRTTI(bool ForEH = false) {
1164	return (ForEH \|\| getLangOpts().RTTI) &&
1165	(!getLangOpts().isTargetDevice() \|\| !getTriple().isGPU());
1166	}
1167
1168	/// Get the address of the RTTI descriptor for the given type.
1169	llvm::Constant GetAddrOfRTTIDescriptor(QualType Ty, bool* ForEH = false);
1170
1171	/// Get the address of a GUID.
1172	ConstantAddress GetAddrOfMSGuidDecl(const MSGuidDecl *GD);
1173
1174	/// Get the address of a UnnamedGlobalConstant
1175	ConstantAddress
1176	GetAddrOfUnnamedGlobalConstantDecl(const UnnamedGlobalConstantDecl *GCD);
1177
1178	/// Get the address of a template parameter object.
1179	ConstantAddress
1180	GetAddrOfTemplateParamObject(const TemplateParamObjectDecl *TPO);
1181
1182	/// Get the address of the thunk for the given global decl.
1183	llvm::Constant GetAddrOfThunk(StringRef Name, llvm::Type FnTy,
1184	GlobalDecl GD);
1185
1186	/// Get a reference to the target of VD.
1187	ConstantAddress GetWeakRefReference(const ValueDecl *VD);
1188
1189	/// Returns the assumed alignment of an opaque pointer to the given class.
1190	CharUnits getClassPointerAlignment(const CXXRecordDecl *CD);
1191
1192	/// Returns the minimum object size for an object of the given class type
1193	/// (or a class derived from it).
1194	CharUnits getMinimumClassObjectSize(const CXXRecordDecl *CD);
1195
1196	/// Returns the minimum object size for an object of the given type.
1197	CharUnits getMinimumObjectSize(QualType Ty) {
1198	if (CXXRecordDecl *RD = Ty ->getAsCXXRecordDecl())
1199	return getMinimumClassObjectSize(CD: RD);
1200	return getContext().getTypeSizeInChars(T: Ty);
1201	}
1202
1203	/// Returns the assumed alignment of a virtual base of a class.
1204	CharUnits getVBaseAlignment(CharUnits DerivedAlign,
1205	const CXXRecordDecl *Derived,
1206	const CXXRecordDecl *VBase);
1207
1208	/// Given a class pointer with an actual known alignment, and the
1209	/// expected alignment of an object at a dynamic offset w.r.t that
1210	/// pointer, return the alignment to assume at the offset.
1211	CharUnits getDynamicOffsetAlignment(CharUnits ActualAlign,
1212	const CXXRecordDecl *Class,
1213	CharUnits ExpectedTargetAlign);
1214
1215	CharUnits
1216	computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass,
1217	CastExpr::path_const_iterator Start,
1218	CastExpr::path_const_iterator End);
1219
1220	/// Returns the offset from a derived class to a class. Returns null if the
1221	/// offset is 0.
1222	llvm::Constant *
1223	GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
1224	CastExpr::path_const_iterator PathBegin,
1225	CastExpr::path_const_iterator PathEnd);
1226
1227	llvm::FoldingSet<BlockByrefHelpers> ByrefHelpersCache;
1228
1229	/// Fetches the global unique block count.
1230	int getUniqueBlockCount() { return ++Block.GlobalUniqueCount; }
1231
1232	/// Fetches the type of a generic block descriptor.
1233	llvm::Type *getBlockDescriptorType();
1234
1235	/// The type of a generic block literal.
1236	llvm::Type *getGenericBlockLiteralType();
1237
1238	/// Gets the address of a block which requires no captures.
1239	llvm::Constant GetAddrOfGlobalBlock(const* BlockExpr *BE, StringRef Name);
1240
1241	/// Returns the address of a block which requires no caputres, or null if
1242	/// we've yet to emit the block for BE.
1243	llvm::Constant getAddrOfGlobalBlockIfEmitted(const* BlockExpr *BE) {
1244	return EmittedGlobalBlocks.lookup(Val: BE);
1245	}
1246
1247	/// Notes that BE's global block is available via Addr. Asserts that BE
1248	/// isn't already emitted.
1249	void setAddrOfGlobalBlock(const BlockExpr BE, llvm::Constant Addr);
1250
1251	/// Return a pointer to a constant CFString object for the given string.
1252	ConstantAddress GetAddrOfConstantCFString(const StringLiteral *Literal);
1253
1254	/// Return a constant array for the given string.
1255	llvm::Constant GetConstantArrayFromStringLiteral(const* StringLiteral *E);
1256
1257	/// Return a pointer to a constant array for the given string literal.
1258	ConstantAddress
1259	GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
1260	StringRef Name = ".str");
1261
1262	/// Return a pointer to a constant array for the given ObjCEncodeExpr node.
1263	ConstantAddress
1264	GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
1265
1266	/// Returns a pointer to a character array containing the literal and a
1267	/// terminating '\0' character. The result has pointer to array type.
1268	///
1269	/// \param GlobalName If provided, the name to use for the global (if one is
1270	/// created).
1271	ConstantAddress GetAddrOfConstantCString(const std::string &Str,
1272	StringRef GlobalName = ".str");
1273
1274	/// Returns a pointer to a constant global variable for the given file-scope
1275	/// compound literal expression.
1276	ConstantAddress GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr*E);
1277
1278	/// If it's been emitted already, returns the GlobalVariable corresponding to
1279	/// a compound literal. Otherwise, returns null.
1280	llvm::GlobalVariable *
1281	getAddrOfConstantCompoundLiteralIfEmitted(const CompoundLiteralExpr *E);
1282
1283	/// Notes that CLE's GlobalVariable is GV. Asserts that CLE isn't already
1284	/// emitted.
1285	void setAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *CLE,
1286	llvm::GlobalVariable *GV);
1287
1288	/// Returns a pointer to a global variable representing a temporary
1289	/// with static or thread storage duration.
1290	ConstantAddress GetAddrOfGlobalTemporary(const MaterializeTemporaryExpr *E,
1291	const Expr *Inner);
1292
1293	/// Retrieve the record type that describes the state of an
1294	/// Objective-C fast enumeration loop (for..in).
1295	QualType getObjCFastEnumerationStateType();
1296
1297	// Produce code for this constructor/destructor. This method doesn't try
1298	// to apply any ABI rules about which other constructors/destructors
1299	// are needed or if they are alias to each other.
1300	llvm::Function *codegenCXXStructor(GlobalDecl GD);
1301
1302	/// Emit a trap stub body for functions in ASTContext::CUDADeviceInvalidFuncs.
1303	bool tryEmitCUDADeviceInvalidFunctionBody(GlobalDecl GD, llvm::Function *Fn);
1304
1305	/// Return the address of the constructor/destructor of the given type.
1306	llvm::Constant *
1307	getAddrOfCXXStructor(GlobalDecl GD, const CGFunctionInfo FnInfo = nullptr*,
1308	llvm::FunctionType FnType = nullptr*,
1309	bool DontDefer = false,
1310	ForDefinition_t IsForDefinition = NotForDefinition) {
1311	return cast<llvm::Constant>(Val: getAddrAndTypeOfCXXStructor(GD, FnInfo, FnType,
1312	DontDefer,
1313	IsForDefinition)
1314	.getCallee());
1315	}
1316
1317	llvm::FunctionCallee getAddrAndTypeOfCXXStructor(
1318	GlobalDecl GD, const CGFunctionInfo FnInfo = nullptr*,
1319	llvm::FunctionType FnType = nullptr, bool* DontDefer = false,
1320	ForDefinition_t IsForDefinition = NotForDefinition);
1321
1322	/// Given a builtin id for a function like "__builtin_fabsf", return a
1323	/// Function for "fabsf".*
1324	llvm::Constant getBuiltinLibFunction(const* FunctionDecl *FD,
1325	unsigned BuiltinID);
1326
1327	llvm::Function getIntrinsic(unsigned* IID, ArrayRef<llvm::Type *> Tys = {});
1328
1329	void AddCXXGlobalInit(llvm::Function *F) { CXXGlobalInits.push_back(x: F); }
1330
1331	/// Emit code for a single top level declaration.
1332	void EmitTopLevelDecl(Decl *D);
1333
1334	/// Stored a deferred empty coverage mapping for an unused
1335	/// and thus uninstrumented top level declaration.
1336	void AddDeferredUnusedCoverageMapping(Decl *D);
1337
1338	/// Remove the deferred empty coverage mapping as this
1339	/// declaration is actually instrumented.
1340	void ClearUnusedCoverageMapping(const Decl *D);
1341
1342	/// Emit all the deferred coverage mappings
1343	/// for the uninstrumented functions.
1344	void EmitDeferredUnusedCoverageMappings();
1345
1346	/// Emit an alias for "main" if it has no arguments (needed for wasm).
1347	void EmitMainVoidAlias();
1348
1349	/// Tell the consumer that this variable has been instantiated.
1350	void HandleCXXStaticMemberVarInstantiation(VarDecl *VD);
1351
1352	/// If the declaration has internal linkage but is inside an
1353	/// extern "C" linkage specification, prepare to emit an alias for it
1354	/// to the expected name.
1355	template<typename SomeDecl>
1356	void MaybeHandleStaticInExternC(const SomeDecl D, llvm::GlobalValue GV);
1357
1358	/// Add a global to a list to be added to the llvm.used metadata.
1359	void addUsedGlobal(llvm::GlobalValue *GV);
1360
1361	/// Add a global to a list to be added to the llvm.compiler.used metadata.
1362	void addCompilerUsedGlobal(llvm::GlobalValue *GV);
1363
1364	/// Add a global to a list to be added to the llvm.compiler.used metadata.
1365	void addUsedOrCompilerUsedGlobal(llvm::GlobalValue *GV);
1366
1367	/// Add a destructor and object to add to the C++ global destructor function.
1368	void AddCXXDtorEntry(llvm::FunctionCallee DtorFn, llvm::Constant *Object) {
1369	CXXGlobalDtorsOrStermFinalizers.emplace_back(Args: DtorFn.getFunctionType(),
1370	Args: DtorFn.getCallee(), Args&: Object);
1371	}
1372
1373	/// Add an sterm finalizer to the C++ global cleanup function.
1374	void AddCXXStermFinalizerEntry(llvm::FunctionCallee DtorFn) {
1375	CXXGlobalDtorsOrStermFinalizers.emplace_back(Args: DtorFn.getFunctionType(),
1376	Args: DtorFn.getCallee(), Args: nullptr);
1377	}
1378
1379	/// Add an sterm finalizer to its own llvm.global_dtors entry.
1380	void AddCXXStermFinalizerToGlobalDtor(llvm::Function *StermFinalizer,
1381	int Priority) {
1382	AddGlobalDtor(Dtor: StermFinalizer, Priority);
1383	}
1384
1385	void AddCXXPrioritizedStermFinalizerEntry(llvm::Function *StermFinalizer,
1386	int Priority) {
1387	OrderGlobalInitsOrStermFinalizers Key(Priority,
1388	PrioritizedCXXStermFinalizers.size());
1389	PrioritizedCXXStermFinalizers.push_back(
1390	Elt: std::make_pair(x&: Key, y&: StermFinalizer));
1391	}
1392
1393	/// Create or return a runtime function declaration with the specified type
1394	/// and name. If \p AssumeConvergent is true, the call will have the
1395	/// convergent attribute added.
1396	///
1397	/// For new code, please use the overload that takes a QualType; it sets
1398	/// function attributes more accurately.
1399	llvm::FunctionCallee
1400	CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name,
1401	llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
1402	bool Local = false, bool AssumeConvergent = false);
1403
1404	/// Create or return a runtime function declaration with the specified type
1405	/// and name. If \p AssumeConvergent is true, the call will have the
1406	/// convergent attribute added.
1407	llvm::FunctionCallee
1408	CreateRuntimeFunction(QualType ReturnTy, ArrayRef<QualType> ArgTys,
1409	StringRef Name,
1410	llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
1411	bool Local = false, bool AssumeConvergent = false);
1412
1413	/// Create a new runtime global variable with the specified type and name.
1414	llvm::Constant CreateRuntimeVariable(llvm::Type Ty,
1415	StringRef Name);
1416
1417	///@name Custom Blocks Runtime Interfaces
1418	///@{
1419
1420	llvm::Constant *getNSConcreteGlobalBlock();
1421	llvm::Constant *getNSConcreteStackBlock();
1422	llvm::FunctionCallee getBlockObjectAssign();
1423	llvm::FunctionCallee getBlockObjectDispose();
1424
1425	///@}
1426
1427	llvm::Function *getLLVMLifetimeStartFn();
1428	llvm::Function *getLLVMLifetimeEndFn();
1429	llvm::Function *getLLVMFakeUseFn();
1430
1431	// Make sure that this type is translated.
1432	void UpdateCompletedType(const TagDecl *TD);
1433
1434	llvm::Constant getMemberPointerConstant(const* UnaryOperator *e);
1435
1436	/// Emit type info if type of an expression is a variably modified
1437	/// type. Also emit proper debug info for cast types.
1438	void EmitExplicitCastExprType(const ExplicitCastExpr *E,
1439	CodeGenFunction CGF = nullptr*);
1440
1441	/// Return the result of value-initializing the given type, i.e. a null
1442	/// expression of the given type. This is usually, but not always, an LLVM
1443	/// null constant.
1444	llvm::Constant *EmitNullConstant(QualType T);
1445
1446	/// Return a null constant appropriate for zero-initializing a base class with
1447	/// the given type. This is usually, but not always, an LLVM null constant.
1448	llvm::Constant EmitNullConstantForBase(const* CXXRecordDecl *Record);
1449
1450	/// Emit a general error that something can't be done.
1451	void Error(SourceLocation loc, StringRef error);
1452
1453	/// Print out an error that codegen doesn't support the specified stmt yet.
1454	void ErrorUnsupported(const Stmt S, const* char *Type);
1455
1456	/// Print out an error that codegen doesn't support the specified stmt yet.
1457	void ErrorUnsupported(const Stmt *S, llvm::StringRef Type);
1458
1459	/// Print out an error that codegen doesn't support the specified decl yet.
1460	void ErrorUnsupported(const Decl D, const* char *Type);
1461
1462	/// Run some code with "sufficient" stack space. (Currently, at least 256K is
1463	/// guaranteed). Produces a warning if we're low on stack space and allocates
1464	/// more in that case. Use this in code that may recurse deeply to avoid stack
1465	/// overflow.
1466	void runWithSufficientStackSpace(SourceLocation Loc,
1467	llvm::function_ref<void()> Fn);
1468
1469	/// Set the attributes on the LLVM function for the given decl and function
1470	/// info. This applies attributes necessary for handling the ABI as well as
1471	/// user specified attributes like section.
1472	void SetInternalFunctionAttributes(GlobalDecl GD, llvm::Function *F,
1473	const CGFunctionInfo &FI);
1474
1475	/// Set the LLVM function attributes (sext, zext, etc).
1476	void SetLLVMFunctionAttributes(GlobalDecl GD, const CGFunctionInfo &Info,
1477	llvm::Function F, bool* IsThunk);
1478
1479	/// Set the LLVM function attributes which only apply to a function
1480	/// definition.
1481	void SetLLVMFunctionAttributesForDefinition(const Decl D, llvm::Function F);
1482
1483	/// Set the LLVM function attributes that represent floating point
1484	/// environment.
1485	void setLLVMFunctionFEnvAttributes(const FunctionDecl D, llvm::Function F);
1486
1487	/// Return true iff the given type uses 'sret' when used as a return type.
1488	bool ReturnTypeUsesSRet(const CGFunctionInfo &FI);
1489
1490	/// Return true iff the given type has `inreg` set.
1491	bool ReturnTypeHasInReg(const CGFunctionInfo &FI);
1492
1493	/// Return true iff the given type uses an argument slot when 'sret' is used
1494	/// as a return type.
1495	bool ReturnSlotInterferesWithArgs(const CGFunctionInfo &FI);
1496
1497	/// Return true iff the given type uses 'fpret' when used as a return type.
1498	bool ReturnTypeUsesFPRet(QualType ResultType);
1499
1500	/// Return true iff the given type uses 'fp2ret' when used as a return type.
1501	bool ReturnTypeUsesFP2Ret(QualType ResultType);
1502
1503	/// Get the LLVM attributes and calling convention to use for a particular
1504	/// function type.
1505	///
1506	/// \param Name - The function name.
1507	/// \param Info - The function type information.
1508	/// \param CalleeInfo - The callee information these attributes are being
1509	/// constructed for. If valid, the attributes applied to this decl may
1510	/// contribute to the function attributes and calling convention.
1511	/// \param Attrs [out] - On return, the attribute list to use.
1512	/// \param CallingConv [out] - On return, the LLVM calling convention to use.
1513	void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info,
1514	CGCalleeInfo CalleeInfo,
1515	llvm::AttributeList &Attrs, unsigned &CallingConv,
1516	bool AttrOnCallSite, bool IsThunk);
1517
1518	/// Adjust Memory attribute to ensure that the BE gets the right attribute
1519	// in order to generate the library call or the intrinsic for the function
1520	// name 'Name'.
1521	void AdjustMemoryAttribute(StringRef Name, CGCalleeInfo CalleeInfo,
1522	llvm::AttributeList &Attrs);
1523
1524	/// Like the overload taking a `Function &`, but intended specifically
1525	/// for frontends that want to build on Clang's target-configuration logic.
1526	void addDefaultFunctionDefinitionAttributes(llvm::AttrBuilder &attrs);
1527
1528	StringRef getMangledName(GlobalDecl GD);
1529	StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
1530	const GlobalDecl getMangledNameDecl(StringRef);
1531
1532	void EmitTentativeDefinition(const VarDecl *D);
1533
1534	void EmitExternalDeclaration(const DeclaratorDecl *D);
1535
1536	void EmitVTable(CXXRecordDecl *Class);
1537
1538	void RefreshTypeCacheForClass(const CXXRecordDecl *Class);
1539
1540	/// Appends Opts to the "llvm.linker.options" metadata value.
1541	void AppendLinkerOptions(StringRef Opts);
1542
1543	/// Appends a detect mismatch command to the linker options.
1544	void AddDetectMismatch(StringRef Name, StringRef Value);
1545
1546	/// Appends a dependent lib to the appropriate metadata value.
1547	void AddDependentLib(StringRef Lib);
1548
1549	llvm::GlobalVariable::LinkageTypes getFunctionLinkage(GlobalDecl GD);
1550
1551	void setFunctionLinkage(GlobalDecl GD, llvm::Function *F) {
1552	F->setLinkage(getFunctionLinkage(GD));
1553	}
1554
1555	/// Return the appropriate linkage for the vtable, VTT, and type information
1556	/// of the given class.
1557	llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);
1558
1559	/// Return the store size, in character units, of the given LLVM type.
1560	CharUnits GetTargetTypeStoreSize(llvm::Type Ty) const*;
1561
1562	/// Returns LLVM linkage for a declarator.
1563	llvm::GlobalValue::LinkageTypes
1564	getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage);
1565
1566	/// Returns LLVM linkage for a declarator.
1567	llvm::GlobalValue::LinkageTypes
1568	getLLVMLinkageVarDefinition(const VarDecl *VD);
1569
1570	/// Emit all the global annotations.
1571	void EmitGlobalAnnotations();
1572
1573	/// Emit an annotation string.
1574	llvm::Constant *EmitAnnotationString(StringRef Str);
1575
1576	/// Emit the annotation's translation unit.
1577	llvm::Constant *EmitAnnotationUnit(SourceLocation Loc);
1578
1579	/// Emit the annotation line number.
1580	llvm::Constant *EmitAnnotationLineNo(SourceLocation L);
1581
1582	/// Emit additional args of the annotation.
1583	llvm::Constant EmitAnnotationArgs(const* AnnotateAttr *Attr);
1584
1585	/// Generate the llvm::ConstantStruct which contains the annotation
1586	/// information for a given GlobalValue. The annotation struct is
1587	/// {i8 , i8 , i8 , i32}. The first field is a constant expression, the*
1588	/// GlobalValue being annotated. The second field is the constant string
1589	/// created from the AnnotateAttr's annotation. The third field is a constant
1590	/// string containing the name of the translation unit. The fourth field is
1591	/// the line number in the file of the annotated value declaration.
1592	llvm::Constant EmitAnnotateAttr(llvm::GlobalValue GV,
1593	const AnnotateAttr *AA,
1594	SourceLocation L);
1595
1596	/// Add global annotations that are set on D, for the global GV. Those
1597	/// annotations are emitted during finalization of the LLVM code.
1598	void AddGlobalAnnotations(const ValueDecl D, llvm::GlobalValue GV);
1599
1600	bool isInNoSanitizeList(SanitizerMask Kind, llvm::Function *Fn,
1601	SourceLocation Loc) const;
1602
1603	bool isInNoSanitizeList(SanitizerMask Kind, llvm::GlobalVariable *GV,
1604	SourceLocation Loc, QualType Ty,
1605	StringRef Category = StringRef()) const;
1606
1607	/// Imbue XRay attributes to a function, applying the always/never attribute
1608	/// lists in the process. Returns true if we did imbue attributes this way,
1609	/// false otherwise.
1610	bool imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
1611	StringRef Category = StringRef()) const;
1612
1613	/// \returns true if \p Fn at \p Loc should be excluded from profile
1614	/// instrumentation by the SCL passed by \p -fprofile-list.
1615	ProfileList::ExclusionType
1616	isFunctionBlockedByProfileList(llvm::Function Fn, SourceLocation Loc) const*;
1617
1618	/// \returns true if \p Fn at \p Loc should be excluded from profile
1619	/// instrumentation.
1620	ProfileList::ExclusionType
1621	isFunctionBlockedFromProfileInstr(llvm::Function *Fn,
1622	SourceLocation Loc) const;
1623
1624	SanitizerMetadata *getSanitizerMetadata() {
1625	return SanitizerMD.get();
1626	}
1627
1628	void addDeferredVTable(const CXXRecordDecl *RD) {
1629	DeferredVTables.push_back(x: RD);
1630	}
1631
1632	/// Emit code for a single global function or var decl. Forward declarations
1633	/// are emitted lazily.
1634	void EmitGlobal(GlobalDecl D);
1635
1636	/// Record that new[] was called for the class, transform vector deleting
1637	/// destructor definition in a form of alias to the actual definition.
1638	void requireVectorDestructorDefinition(const CXXRecordDecl *RD);
1639
1640	/// Check that class need vector deleting destructor body.
1641	bool classNeedsVectorDestructor(const CXXRecordDecl *RD);
1642
1643	bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
1644	void EmitDefinitionAsAlias(GlobalDecl Alias, GlobalDecl Target);
1645
1646	llvm::GlobalValue *GetGlobalValue(StringRef Ref);
1647
1648	/// Set attributes which are common to any form of a global definition (alias,
1649	/// Objective-C method, function, global variable).
1650	///
1651	/// NOTE: This should only be called for definitions.
1652	void SetCommonAttributes(GlobalDecl GD, llvm::GlobalValue *GV);
1653
1654	void addReplacement(StringRef Name, llvm::Constant *C);
1655
1656	void addGlobalValReplacement(llvm::GlobalValue GV, llvm::Constant C);
1657
1658	/// Emit a code for threadprivate directive.
1659	/// \param D Threadprivate declaration.
1660	void EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D);
1661
1662	/// Emit a code for declare reduction construct.
1663	void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
1664	CodeGenFunction CGF = nullptr*);
1665
1666	/// Emit a code for declare mapper construct.
1667	void EmitOMPDeclareMapper(const OMPDeclareMapperDecl *D,
1668	CodeGenFunction CGF = nullptr*);
1669
1670	// Emit code for the OpenACC Declare declaration.
1671	void EmitOpenACCDeclare(const OpenACCDeclareDecl *D,
1672	CodeGenFunction CGF = nullptr*);
1673	// Emit code for the OpenACC Routine declaration.
1674	void EmitOpenACCRoutine(const OpenACCRoutineDecl *D,
1675	CodeGenFunction CGF = nullptr*);
1676
1677	/// Emit a code for requires directive.
1678	/// \param D Requires declaration
1679	void EmitOMPRequiresDecl(const OMPRequiresDecl *D);
1680
1681	/// Emit a code for the allocate directive.
1682	/// \param D The allocate declaration
1683	void EmitOMPAllocateDecl(const OMPAllocateDecl *D);
1684
1685	/// Return the alignment specified in an allocate directive, if present.
1686	std::optional<CharUnits> getOMPAllocateAlignment(const VarDecl *VD);
1687
1688	/// Returns whether the given record has hidden LTO visibility and therefore
1689	/// may participate in (single-module) CFI and whole-program vtable
1690	/// optimization.
1691	bool HasHiddenLTOVisibility(const CXXRecordDecl *RD);
1692
1693	/// Returns whether the given record has public LTO visibility (regardless of
1694	/// -lto-whole-program-visibility) and therefore may not participate in
1695	/// (single-module) CFI and whole-program vtable optimization.
1696	bool AlwaysHasLTOVisibilityPublic(const CXXRecordDecl *RD);
1697
1698	/// Returns the vcall visibility of the given type. This is the scope in which
1699	/// a virtual function call could be made which ends up being dispatched to a
1700	/// member function of this class. This scope can be wider than the visibility
1701	/// of the class itself when the class has a more-visible dynamic base class.
1702	/// The client should pass in an empty Visited set, which is used to prevent
1703	/// redundant recursive processing.
1704	llvm::GlobalObject::VCallVisibility
1705	GetVCallVisibilityLevel(const CXXRecordDecl *RD,
1706	llvm::DenseSet<const CXXRecordDecl *> &Visited);
1707
1708	/// Emit type metadata for the given vtable using the given layout.
1709	void EmitVTableTypeMetadata(const CXXRecordDecl *RD,
1710	llvm::GlobalVariable *VTable,
1711	const VTableLayout &VTLayout);
1712
1713	llvm::Type getVTableComponentType() const*;
1714
1715	/// Generate a cross-DSO type identifier for MD.
1716	llvm::ConstantInt CreateCrossDsoCfiTypeId(llvm::Metadata MD);
1717
1718	/// Generate a KCFI type identifier for T.
1719	llvm::ConstantInt *CreateKCFITypeId(QualType T, StringRef Salt);
1720
1721	/// Create a metadata identifier for the given function type.
1722	llvm::Metadata *CreateMetadataIdentifierForFnType(QualType T);
1723
1724	/// Create a metadata identifier for the given type. This may either be an
1725	/// MDString (for external identifiers) or a distinct unnamed MDNode (for
1726	/// internal identifiers).
1727	llvm::Metadata *CreateMetadataIdentifierForType(QualType T);
1728
1729	/// Create a metadata identifier that is intended to be used to check virtual
1730	/// calls via a member function pointer.
1731	llvm::Metadata *CreateMetadataIdentifierForVirtualMemPtrType(QualType T);
1732
1733	/// Create a metadata identifier for the generalization of the given type.
1734	/// This may either be an MDString (for external identifiers) or a distinct
1735	/// unnamed MDNode (for internal identifiers).
1736	llvm::Metadata *CreateMetadataIdentifierGeneralized(QualType T);
1737
1738	/// Create and attach type metadata to the given function.
1739	void createFunctionTypeMetadataForIcall(const FunctionDecl *FD,
1740	llvm::Function *F);
1741
1742	/// Create and attach type metadata if the function is a potential indirect
1743	/// call target to support call graph section.
1744	void createIndirectFunctionTypeMD(const FunctionDecl FD, llvm::Function F);
1745
1746	/// Create and attach type metadata to the given call.
1747	void createCalleeTypeMetadataForIcall(const QualType &QT, llvm::CallBase *CB);
1748
1749	/// Set type metadata to the given function.
1750	void setKCFIType(const FunctionDecl FD, llvm::Function F);
1751
1752	/// Emit KCFI type identifier constants and remove unused identifiers.
1753	void finalizeKCFITypes();
1754
1755	/// Whether this function's return type has no side effects, and thus may
1756	/// be trivially discarded if it is unused.
1757	bool MayDropFunctionReturn(const ASTContext &Context,
1758	QualType ReturnType) const;
1759
1760	/// Returns whether this module needs the "all-vtables" type identifier.
1761	bool NeedAllVtablesTypeId() const;
1762
1763	/// Create and attach type metadata for the given vtable.
1764	void AddVTableTypeMetadata(llvm::GlobalVariable *VTable, CharUnits Offset,
1765	const CXXRecordDecl *RD);
1766
1767	/// Return a vector of most-base classes for RD. This is used to implement
1768	/// control flow integrity checks for member function pointers.
1769	///
1770	/// A most-base class of a class C is defined as a recursive base class of C,
1771	/// including C itself, that does not have any bases.
1772	SmallVector<const CXXRecordDecl *, `0`>
1773	getMostBaseClasses(const CXXRecordDecl *RD);
1774
1775	/// Get the declaration of std::terminate for the platform.
1776	llvm::FunctionCallee getTerminateFn();
1777
1778	llvm::SanitizerStatReport &getSanStats();
1779
1780	llvm::Value *
1781	createOpenCLIntToSamplerConversion(const Expr *E, CodeGenFunction &CGF);
1782
1783	/// OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument
1784	/// information in the program executable. The argument information stored
1785	/// includes the argument name, its type, the address and access qualifiers
1786	/// used. This helper can be used to generate metadata for source code kernel
1787	/// function as well as generated implicitly kernels. If a kernel is generated
1788	/// implicitly null value has to be passed to the last two parameters,
1789	/// otherwise all parameters must have valid non-null values.
1790	/// \param FN is a pointer to IR function being generated.
1791	/// \param FD is a pointer to function declaration if any.
1792	/// \param CGF is a pointer to CodeGenFunction that generates this function.
1793	void GenKernelArgMetadata(llvm::Function *FN,
1794	const FunctionDecl FD = nullptr*,
1795	CodeGenFunction CGF = nullptr*);
1796
1797	/// Get target specific null pointer.
1798	/// \param T is the LLVM type of the null pointer.
1799	/// \param QT is the clang QualType of the null pointer.
1800	llvm::Constant getNullPointer(llvm::PointerType T, QualType QT);
1801
1802	CharUnits getNaturalTypeAlignment(QualType T,
1803	LValueBaseInfo BaseInfo = nullptr*,
1804	TBAAAccessInfo TBAAInfo = nullptr*,
1805	bool forPointeeType = false);
1806	CharUnits getNaturalPointeeTypeAlignment(QualType T,
1807	LValueBaseInfo BaseInfo = nullptr*,
1808	TBAAAccessInfo TBAAInfo = nullptr*);
1809	bool stopAutoInit();
1810
1811	/// Print the postfix for externalized static variable or kernels for single
1812	/// source offloading languages CUDA and HIP. The unique postfix is created
1813	/// using either the CUID argument, or the file's UniqueID and active macros.
1814	/// The fallback method without a CUID requires that the offloading toolchain
1815	/// does not define separate macros via the -cc1 options.
1816	void printPostfixForExternalizedDecl(llvm::raw_ostream &OS,
1817	const Decl D) const*;
1818
1819	/// Move some lazily-emitted states to the NewBuilder. This is especially
1820	/// essential for the incremental parsing environment like Clang Interpreter,
1821	/// because we'll lose all important information after each repl.
1822	void moveLazyEmissionStates(CodeGenModule *NewBuilder);
1823
1824	/// Emit the IR encoding to attach the CUDA launch bounds attribute to \p F.
1825	/// If \p MaxThreadsVal is not nullptr, the max threads value is stored in it,
1826	/// if a valid one was found.
1827	void handleCUDALaunchBoundsAttr(llvm::Function *F,
1828	const CUDALaunchBoundsAttr *A,
1829	int32_t MaxThreadsVal = nullptr*,
1830	int32_t MinBlocksVal = nullptr*,
1831	int32_t MaxClusterRankVal = nullptr*);
1832
1833	/// Emit the IR encoding to attach the AMD GPU flat-work-group-size attribute
1834	/// to \p F. Alternatively, the work group size can be taken from a \p
1835	/// ReqdWGS. If \p MinThreadsVal is not nullptr, the min threads value is
1836	/// stored in it, if a valid one was found. If \p MaxThreadsVal is not
1837	/// nullptr, the max threads value is stored in it, if a valid one was found.
1838	void handleAMDGPUFlatWorkGroupSizeAttr(
1839	llvm::Function F, const* AMDGPUFlatWorkGroupSizeAttr *A,
1840	const ReqdWorkGroupSizeAttr ReqdWGS = nullptr*,
1841	int32_t MinThreadsVal = nullptr, int32_t MaxThreadsVal = nullptr);
1842
1843	/// Emit the IR encoding to attach the AMD GPU waves-per-eu attribute to \p F.
1844	void handleAMDGPUWavesPerEUAttr(llvm::Function *F,
1845	const AMDGPUWavesPerEUAttr *A);
1846
1847	llvm::Constant *
1848	GetOrCreateLLVMGlobal(StringRef MangledName, llvm::Type *Ty, LangAS AddrSpace,
1849	const VarDecl *D,
1850	ForDefinition_t IsForDefinition = NotForDefinition);
1851
1852	// FIXME: Hardcoding priority here is gross.
1853	void AddGlobalCtor(llvm::Function Ctor, int* Priority = `65535`,
1854	unsigned LexOrder = ~`0U`,
1855	llvm::Constant AssociatedData = nullptr*);
1856	void AddGlobalDtor(llvm::Function Dtor, int* Priority = `65535`,
1857	bool IsDtorAttrFunc = false);
1858
1859	// Return whether structured convergence intrinsics should be generated for
1860	// this target.
1861	bool shouldEmitConvergenceTokens() const {
1862	// TODO: this should probably become unconditional once the controlled
1863	// convergence becomes the norm.
1864	return getTriple().isSPIRVLogical() \|\| getTriple().isDXIL();
1865	}
1866
1867	void addUndefinedGlobalForTailCall(
1868	std::pair<const FunctionDecl *, SourceLocation> Global) {
1869	MustTailCallUndefinedGlobals.insert(X: Global);
1870	}
1871
1872	bool shouldZeroInitPadding() const {
1873	// In C23 (N3096) $6.7.10:
1874	// """
1875	// If any object is initialized with an empty iniitializer, then it is
1876	// subject to default initialization:
1877	// - if it is an aggregate, every member is initialized (recursively)
1878	// according to these rules, and any padding is initialized to zero bits;
1879	// - if it is a union, the first named member is initialized (recursively)
1880	// according to these rules, and any padding is initialized to zero bits.
1881	//
1882	// If the aggregate or union contains elements or members that are
1883	// aggregates or unions, these rules apply recursively to the subaggregates
1884	// or contained unions.
1885	//
1886	// If there are fewer initializers in a brace-enclosed list than there are
1887	// elements or members of an aggregate, or fewer characters in a string
1888	// literal used to initialize an array of known size than there are elements
1889	// in the array, the remainder of the aggregate is subject to default
1890	// initialization.
1891	// """
1892	//
1893	// From my understanding, the standard is ambiguous in the following two
1894	// areas:
1895	// 1. For a union type with empty initializer, if the first named member is
1896	// not the largest member, then the bytes comes after the first named member
1897	// but before padding are left unspecified. An example is:
1898	// union U { int a; long long b;};
1899	// union U u = {}; // The first 4 bytes are 0, but 4-8 bytes are left
1900	// unspecified.
1901	//
1902	// 2. It only mentions padding for empty initializer, but doesn't mention
1903	// padding for a non empty initialization list. And if the aggregation or
1904	// union contains elements or members that are aggregates or unions, and
1905	// some are non empty initializers, while others are empty initiailizers,
1906	// the padding initialization is unclear. An example is:
1907	// struct S1 { int a; long long b; };
1908	// struct S2 { char c; struct S1 s1; };
1909	// // The values for paddings between s2.c and s2.s1.a, between s2.s1.a
1910	// and s2.s1.b are unclear.
1911	// struct S2 s2 = { 'c' };
1912	//
1913	// Here we choose to zero initiailize left bytes of a union type. Because
1914	// projects like the Linux kernel are relying on this behavior. If we don't
1915	// explicitly zero initialize them, the undef values can be optimized to
1916	// return gabage data. We also choose to zero initialize paddings for
1917	// aggregates and unions, no matter they are initialized by empty
1918	// initializers or non empty initializers. This can provide a consistent
1919	// behavior. So projects like the Linux kernel can rely on it.
1920	return !getLangOpts().CPlusPlus;
1921	}
1922
1923	// Helper to get the alignment for a variable.
1924	unsigned getVtableGlobalVarAlignment(const VarDecl D = nullptr*) {
1925	LangAS AS = GetGlobalVarAddressSpace(D);
1926	unsigned PAlign = Context.getLangOpts().RelativeCXXABIVTables
1927	? `32`
1928	: getTarget().getPointerAlign(AddrSpace: AS);
1929	return PAlign;
1930	}
1931
1932	/// Helper function to construct a TrapReasonBuilder
1933	TrapReasonBuilder BuildTrapReason(unsigned DiagID, TrapReason &TR) {
1934	return TrapReasonBuilder (&getDiags(), DiagID, TR);
1935	}
1936
1937	llvm::Constant performAddrSpaceCast(llvm::Constant Src,
1938	llvm::Type *DestTy) {
1939	// Since target may map different address spaces in AST to the same address
1940	// space, an address space conversion may end up as a bitcast.
1941	return llvm::ConstantExpr::getPointerCast(C: Src, Ty: DestTy);
1942	}
1943
1944	std::optional<llvm::Attribute::AttrKind>
1945	StackProtectorAttribute(const Decl D) const*;
1946
1947	std::string getPFPFieldName(const FieldDecl *FD);
1948	llvm::GlobalValue getPFPDeactivationSymbol(const* FieldDecl *FD);
1949
1950	private:
1951	/// Translate an llvm::abi::ArgInfo (computed by the LLVMABI library) into
1952	/// the clang ABIArgInfo consumed by the rest of CodeGen. Used by the
1953	/// experimental ABI lowering path.
1954	ABIArgInfo convertABIArgInfo(const llvm::abi::ArgInfo &AbiInfo,
1955	QualType Type);
1956
1957	/// Process #pragma comment(copyright, ...).
1958	void ProcessPragmaCommentCopyright(StringRef Comment, bool isFromASTFile);
1959
1960	bool shouldDropDLLAttribute(const Decl D, const* llvm::GlobalValue GV) const*;
1961
1962	llvm::Constant *GetOrCreateLLVMFunction(
1963	StringRef MangledName, llvm::Type Ty, GlobalDecl D, bool* ForVTable,
1964	bool DontDefer = false, bool IsThunk = false,
1965	llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
1966	ForDefinition_t IsForDefinition = NotForDefinition);
1967
1968	// Adds a declaration to the list of multi version functions if not present.
1969	void AddDeferredMultiVersionResolverToEmit(GlobalDecl GD);
1970
1971	// References to multiversion functions are resolved through an implicitly
1972	// defined resolver function. This function is responsible for creating
1973	// the resolver symbol for the provided declaration. The value returned
1974	// will be for an ifunc (llvm::GlobalIFunc) if the current target supports
1975	// that feature and for a regular function (llvm::GlobalValue) otherwise.
1976	llvm::Constant *GetOrCreateMultiVersionResolver(GlobalDecl GD);
1977
1978	// Set attributes to a resolver function generated by Clang.
1979	// GD is either the cpu_dispatch declaration or an arbitrarily chosen
1980	// function declaration that triggered the implicit generation of this
1981	// resolver function.
1982	//
1983	/// NOTE: This should only be called for definitions.
1984	void setMultiVersionResolverAttributes(llvm::Function *Resolver,
1985	GlobalDecl GD);
1986
1987	// In scenarios where a function is not known to be a multiversion function
1988	// until a later declaration, it is sometimes necessary to change the
1989	// previously created mangled name to align with requirements of whatever
1990	// multiversion function kind the function is now known to be. This function
1991	// is responsible for performing such mangled name updates.
1992	void UpdateMultiVersionNames(GlobalDecl GD, const FunctionDecl *FD,
1993	StringRef &CurName);
1994
1995	bool GetCPUAndFeaturesAttributes(GlobalDecl GD,
1996	llvm::AttrBuilder &AttrBuilder,
1997	bool SetTargetFeatures = true);
1998	void setNonAliasAttributes(GlobalDecl GD, llvm::GlobalObject *GO);
1999
2000	/// Set function attributes for a function declaration.
2001	void SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
2002	bool IsIncompleteFunction, bool IsThunk);
2003
2004	void EmitGlobalDefinition(GlobalDecl D, llvm::GlobalValue GV = nullptr*);
2005
2006	void EmitGlobalFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
2007	void EmitMultiVersionFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
2008
2009	void EmitGlobalVarDefinition(const VarDecl D, bool* IsTentative = false);
2010	void EmitAliasDefinition(GlobalDecl GD);
2011	void emitIFuncDefinition(GlobalDecl GD);
2012	void emitCPUDispatchDefinition(GlobalDecl GD);
2013	void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
2014	void EmitObjCIvarInitializations(ObjCImplementationDecl *D);
2015
2016	// C++ related functions.
2017
2018	void EmitDeclContext(const DeclContext *DC);
2019	void EmitLinkageSpec(const LinkageSpecDecl *D);
2020	void EmitTopLevelStmt(const TopLevelStmtDecl *D);
2021
2022	/// Emit the function that initializes C++ thread_local variables.
2023	void EmitCXXThreadLocalInitFunc();
2024
2025	/// Emit the function that initializes global variables for a C++ Module.
2026	void EmitCXXModuleInitFunc(clang::Module *Primary);
2027
2028	/// Emit the function that initializes C++ globals.
2029	void EmitCXXGlobalInitFunc();
2030
2031	/// Emit the function that performs cleanup associated with C++ globals.
2032	void EmitCXXGlobalCleanUpFunc();
2033
2034	/// Emit the function that initializes the specified global (if PerformInit is
2035	/// true) and registers its destructor.
2036	void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
2037	llvm::GlobalVariable *Addr,
2038	bool PerformInit);
2039
2040	void EmitPointerToInitFunc(const VarDecl VD, llvm::GlobalVariable Addr,
2041	llvm::Function InitFunc, InitSegAttr ISA);
2042
2043	/// EmitCtorList - Generates a global array of functions and priorities using
2044	/// the given list and name. This array will have appending linkage and is
2045	/// suitable for use as a LLVM constructor or destructor array. Clears Fns.
2046	void EmitCtorList(CtorList &Fns, const char *GlobalName);
2047
2048	/// Emit any needed decls for which code generation was deferred.
2049	void EmitDeferred();
2050
2051	/// Try to emit external vtables as available_externally if they have emitted
2052	/// all inlined virtual functions. It runs after EmitDeferred() and therefore
2053	/// is not allowed to create new references to things that need to be emitted
2054	/// lazily.
2055	void EmitVTablesOpportunistically();
2056
2057	/// Call replaceAllUsesWith on all pairs in Replacements.
2058	void applyReplacements();
2059
2060	/// Call replaceAllUsesWith on all pairs in GlobalValReplacements.
2061	void applyGlobalValReplacements();
2062
2063	void checkAliases();
2064
2065	std::map<int, llvm::TinyPtrVector<llvm::Function *>> DtorsUsingAtExit;
2066
2067	/// Register functions annotated with __attribute__((destructor)) using
2068	/// __cxa_atexit, if it is available, or atexit otherwise.
2069	void registerGlobalDtorsWithAtExit();
2070
2071	// When using sinit and sterm functions, unregister
2072	// __attribute__((destructor)) annotated functions which were previously
2073	// registered by the atexit subroutine using unatexit.
2074	void unregisterGlobalDtorsWithUnAtExit();
2075
2076	/// Emit deferred multiversion function resolvers and associated variants.
2077	void emitMultiVersionFunctions();
2078
2079	/// Emit any vtables which we deferred and still have a use for.
2080	void EmitDeferredVTables();
2081
2082	/// Emit a dummy function that reference a CoreFoundation symbol when
2083	/// @available is used on Darwin.
2084	void emitAtAvailableLinkGuard();
2085
2086	/// Emit the llvm.used and llvm.compiler.used metadata.
2087	void emitLLVMUsed();
2088
2089	/// For C++20 Itanium ABI, emit the initializers for the module.
2090	void EmitModuleInitializers(clang::Module *Primary);
2091
2092	/// Emit the link options introduced by imported modules.
2093	void EmitModuleLinkOptions();
2094
2095	/// Helper function for EmitStaticExternCAliases() to redirect ifuncs that
2096	/// have a resolver name that matches 'Elem' to instead resolve to the name of
2097	/// 'CppFunc'. This redirection is necessary in cases where 'Elem' has a name
2098	/// that will be emitted as an alias of the name bound to 'CppFunc'; ifuncs
2099	/// may not reference aliases. Redirection is only performed if 'Elem' is only
2100	/// used by ifuncs in which case, 'Elem' is destroyed. 'true' is returned if
2101	/// redirection is successful, and 'false' is returned otherwise.
2102	bool CheckAndReplaceExternCIFuncs(llvm::GlobalValue *Elem,
2103	llvm::GlobalValue *CppFunc);
2104
2105	/// Emit aliases for internal-linkage declarations inside "C" language
2106	/// linkage specifications, giving them the "expected" name where possible.
2107	void EmitStaticExternCAliases();
2108
2109	void EmitDeclMetadata();
2110
2111	/// Emit the Clang version as llvm.ident metadata.
2112	void EmitVersionIdentMetadata();
2113
2114	/// Emit the Clang commandline as llvm.commandline metadata.
2115	void EmitCommandLineMetadata();
2116
2117	/// Emit the module flag metadata used to pass options controlling the
2118	/// the backend to LLVM.
2119	void EmitBackendOptionsMetadata(const CodeGenOptions &CodeGenOpts);
2120
2121	/// Emits OpenCL specific Metadata e.g. OpenCL version.
2122	void EmitOpenCLMetadata();
2123
2124	/// Emit the llvm.gcov metadata used to tell LLVM where to emit the .gcno and
2125	/// .gcda files in a way that persists in .bc files.
2126	void EmitCoverageFile();
2127
2128	/// Given a sycl_kernel_entry_point attributed function, emit the
2129	/// corresponding SYCL kernel caller offload entry point function.
2130	void EmitSYCLKernelCaller(const FunctionDecl *KernelEntryPointFn,
2131	ASTContext &Ctx);
2132
2133	/// Attach the "sycl-module-id" function attribute to \p Fn, to record the
2134	/// module ID for the translation unit. This attribute is applied to SYCL
2135	/// kernel entry point functions and functions declared with the
2136	/// sycl_external attribute to enable them to be identified as entry points
2137	/// by clang-sycl-linker during device-code splitting.
2138	void addSYCLModuleIdAttr(llvm::Function *Fn);
2139
2140	/// Determine whether the definition must be emitted; if this returns \c
2141	/// false, the definition can be emitted lazily if it's used.
2142	bool MustBeEmitted(const ValueDecl *D);
2143
2144	/// Determine whether the definition can be emitted eagerly, or should be
2145	/// delayed until the end of the translation unit. This is relevant for
2146	/// definitions whose linkage can change, e.g. implicit function instantions
2147	/// which may later be explicitly instantiated.
2148	bool MayBeEmittedEagerly(const ValueDecl *D);
2149
2150	/// Check whether we can use a "simpler", more core exceptions personality
2151	/// function.
2152	void SimplifyPersonality();
2153
2154	/// Helper function for getDefaultFunctionAttributes. Builds a set of function
2155	/// attributes which can be simply added to a function.
2156	void getTrivialDefaultFunctionAttributes(StringRef Name, bool HasOptnone,
2157	bool AttrOnCallSite,
2158	llvm::AttrBuilder &FuncAttrs);
2159
2160	/// Helper function for ConstructAttributeList and
2161	/// addDefaultFunctionDefinitionAttributes. Builds a set of function
2162	/// attributes to add to a function with the given properties.
2163	void getDefaultFunctionAttributes(StringRef Name, bool HasOptnone,
2164	bool AttrOnCallSite,
2165	llvm::AttrBuilder &FuncAttrs);
2166
2167	llvm::Metadata *CreateMetadataIdentifierImpl(QualType T, MetadataTypeMap &Map,
2168	StringRef Suffix);
2169
2170	/// Emit deactivation symbols for any PFP fields whose offset is taken with
2171	/// offsetof.
2172	void emitPFPFieldsWithEvaluatedOffset();
2173	};
2174
2175	} // end namespace CodeGen
2176	} // end namespace clang
2177
2178	#endif // LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
2179

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