1//===--- SemaCUDA.cpp - Semantic Analysis for CUDA constructs -------------===//
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/// \file
9/// This file implements semantic analysis for CUDA constructs.
10///
11//===----------------------------------------------------------------------===//
12
13#include "clang/Sema/SemaCUDA.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/Decl.h"
16#include "clang/AST/ExprCXX.h"
17#include "clang/Basic/Cuda.h"
18#include "clang/Basic/TargetInfo.h"
19#include "clang/Lex/Preprocessor.h"
20#include "clang/Sema/Lookup.h"
21#include "clang/Sema/ScopeInfo.h"
22#include "clang/Sema/Sema.h"
23#include "clang/Sema/SemaDiagnostic.h"
24#include "clang/Sema/SemaInternal.h"
25#include "clang/Sema/Template.h"
26#include "llvm/ADT/STLForwardCompat.h"
27#include "llvm/ADT/SmallVector.h"
28#include <optional>
29using namespace clang;
30
31SemaCUDA::SemaCUDA(Sema &S) : SemaBase(S) {}
32
33template <typename AttrT> static bool hasExplicitAttr(const VarDecl *D) {
34 if (!D)
35 return false;
36 if (auto *A = D->getAttr<AttrT>())
37 return !A->isImplicit();
38 return false;
39}
40
41void SemaCUDA::PushForceHostDevice() {
42 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
43 ForceHostDeviceDepth++;
44}
45
46bool SemaCUDA::PopForceHostDevice() {
47 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
48 if (ForceHostDeviceDepth == 0)
49 return false;
50 ForceHostDeviceDepth--;
51 return true;
52}
53
54ExprResult SemaCUDA::ActOnExecConfigExpr(Scope *S, SourceLocation LLLLoc,
55 MultiExprArg ExecConfig,
56 SourceLocation GGGLoc) {
57 FunctionDecl *ConfigDecl = getASTContext().getcudaConfigureCallDecl();
58 if (!ConfigDecl)
59 return ExprError(Diag(Loc: LLLLoc, DiagID: diag::err_undeclared_var_use)
60 << getConfigureFuncName());
61 QualType ConfigQTy = ConfigDecl->getType();
62
63 DeclRefExpr *ConfigDR = new (getASTContext()) DeclRefExpr(
64 getASTContext(), ConfigDecl, false, ConfigQTy, VK_LValue, LLLLoc);
65 SemaRef.MarkFunctionReferenced(Loc: LLLLoc, Func: ConfigDecl);
66
67 return SemaRef.BuildCallExpr(S, Fn: ConfigDR, LParenLoc: LLLLoc, ArgExprs: ExecConfig, RParenLoc: GGGLoc, ExecConfig: nullptr,
68 /*IsExecConfig=*/true);
69}
70
71CUDAFunctionTarget SemaCUDA::IdentifyTarget(const ParsedAttributesView &Attrs) {
72 bool HasHostAttr = false;
73 bool HasDeviceAttr = false;
74 bool HasGlobalAttr = false;
75 bool HasInvalidTargetAttr = false;
76 for (const ParsedAttr &AL : Attrs) {
77 switch (AL.getKind()) {
78 case ParsedAttr::AT_CUDAGlobal:
79 HasGlobalAttr = true;
80 break;
81 case ParsedAttr::AT_CUDAHost:
82 HasHostAttr = true;
83 break;
84 case ParsedAttr::AT_CUDADevice:
85 HasDeviceAttr = true;
86 break;
87 case ParsedAttr::AT_CUDAInvalidTarget:
88 HasInvalidTargetAttr = true;
89 break;
90 default:
91 break;
92 }
93 }
94
95 if (HasInvalidTargetAttr)
96 return CUDAFunctionTarget::InvalidTarget;
97
98 if (HasGlobalAttr)
99 return CUDAFunctionTarget::Global;
100
101 if (HasHostAttr && HasDeviceAttr)
102 return CUDAFunctionTarget::HostDevice;
103
104 if (HasDeviceAttr)
105 return CUDAFunctionTarget::Device;
106
107 return CUDAFunctionTarget::Host;
108}
109
110template <typename A>
111static bool hasAttr(const Decl *D, bool IgnoreImplicitAttr) {
112 return D->hasAttrs() && llvm::any_of(D->getAttrs(), [&](Attr *Attribute) {
113 return isa<A>(Attribute) &&
114 !(IgnoreImplicitAttr && Attribute->isImplicit());
115 });
116}
117
118SemaCUDA::CUDATargetContextRAII::CUDATargetContextRAII(
119 SemaCUDA &S_, SemaCUDA::CUDATargetContextKind K, Decl *D)
120 : S(S_) {
121 SavedCtx = S.CurCUDATargetCtx;
122 assert(K == SemaCUDA::CTCK_InitGlobalVar);
123 auto *VD = dyn_cast_or_null<VarDecl>(Val: D);
124 if (VD && VD->hasGlobalStorage() && !VD->isStaticLocal()) {
125 auto Target = CUDAFunctionTarget::Host;
126 if ((hasAttr<CUDADeviceAttr>(D: VD, /*IgnoreImplicit=*/IgnoreImplicitAttr: true) &&
127 !hasAttr<CUDAHostAttr>(D: VD, /*IgnoreImplicit=*/IgnoreImplicitAttr: true)) ||
128 hasAttr<CUDASharedAttr>(D: VD, /*IgnoreImplicit=*/IgnoreImplicitAttr: true) ||
129 hasAttr<CUDAConstantAttr>(D: VD, /*IgnoreImplicit=*/IgnoreImplicitAttr: true))
130 Target = CUDAFunctionTarget::Device;
131 S.CurCUDATargetCtx = {.Target: Target, .Kind: K, .D: VD};
132 }
133}
134
135/// IdentifyTarget - Determine the CUDA compilation target for this function
136CUDAFunctionTarget SemaCUDA::IdentifyTarget(const FunctionDecl *D,
137 bool IgnoreImplicitHDAttr) {
138 // Code that lives outside a function gets the target from CurCUDATargetCtx.
139 if (D == nullptr)
140 return CurCUDATargetCtx.Target;
141
142 if (D->hasAttr<CUDAInvalidTargetAttr>())
143 return CUDAFunctionTarget::InvalidTarget;
144
145 if (D->hasAttr<CUDAGlobalAttr>())
146 return CUDAFunctionTarget::Global;
147
148 if (hasAttr<CUDADeviceAttr>(D, IgnoreImplicitAttr: IgnoreImplicitHDAttr)) {
149 if (hasAttr<CUDAHostAttr>(D, IgnoreImplicitAttr: IgnoreImplicitHDAttr))
150 return CUDAFunctionTarget::HostDevice;
151 return CUDAFunctionTarget::Device;
152 } else if (hasAttr<CUDAHostAttr>(D, IgnoreImplicitAttr: IgnoreImplicitHDAttr)) {
153 return CUDAFunctionTarget::Host;
154 } else if ((D->isImplicit() || !D->isUserProvided()) &&
155 !IgnoreImplicitHDAttr) {
156 // Some implicit declarations (like intrinsic functions) are not marked.
157 // Set the most lenient target on them for maximal flexibility.
158 return CUDAFunctionTarget::HostDevice;
159 }
160
161 return CUDAFunctionTarget::Host;
162}
163
164/// IdentifyTarget - Determine the CUDA compilation target for this variable.
165SemaCUDA::CUDAVariableTarget SemaCUDA::IdentifyTarget(const VarDecl *Var) {
166 if (Var->hasAttr<HIPManagedAttr>())
167 return CVT_Unified;
168 // Only constexpr and const variabless with implicit constant attribute
169 // are emitted on both sides. Such variables are promoted to device side
170 // only if they have static constant intializers on device side.
171 if ((Var->isConstexpr() || Var->getType().isConstQualified()) &&
172 Var->hasAttr<CUDAConstantAttr>() &&
173 !hasExplicitAttr<CUDAConstantAttr>(D: Var))
174 return CVT_Both;
175 if (Var->hasAttr<CUDADeviceAttr>() || Var->hasAttr<CUDAConstantAttr>() ||
176 Var->hasAttr<CUDASharedAttr>() ||
177 Var->getType()->isCUDADeviceBuiltinSurfaceType() ||
178 Var->getType()->isCUDADeviceBuiltinTextureType())
179 return CVT_Device;
180 // Function-scope static variable without explicit device or constant
181 // attribute are emitted
182 // - on both sides in host device functions
183 // - on device side in device or global functions
184 if (auto *FD = dyn_cast<FunctionDecl>(Val: Var->getDeclContext())) {
185 switch (IdentifyTarget(D: FD)) {
186 case CUDAFunctionTarget::HostDevice:
187 return CVT_Both;
188 case CUDAFunctionTarget::Device:
189 case CUDAFunctionTarget::Global:
190 return CVT_Device;
191 default:
192 return CVT_Host;
193 }
194 }
195 return CVT_Host;
196}
197
198// * CUDA Call preference table
199//
200// F - from,
201// T - to
202// Ph - preference in host mode
203// Pd - preference in device mode
204// H - handled in (x)
205// Preferences: N:native, SS:same side, HD:host-device, WS:wrong side, --:never.
206//
207// | F | T | Ph | Pd | H |
208// |----+----+-----+-----+-----+
209// | d | d | N | N | (c) |
210// | d | g | -- | -- | (a) |
211// | d | h | -- | -- | (e) |
212// | d | hd | HD | HD | (b) |
213// | g | d | N | N | (c) |
214// | g | g | -- | -- | (a) |
215// | g | h | -- | -- | (e) |
216// | g | hd | HD | HD | (b) |
217// | h | d | -- | -- | (e) |
218// | h | g | N | N | (c) |
219// | h | h | N | N | (c) |
220// | h | hd | HD | HD | (b) |
221// | hd | d | WS | SS | (d) |
222// | hd | g | SS | -- |(d/a)|
223// | hd | h | SS | WS | (d) |
224// | hd | hd | HD | HD | (b) |
225
226SemaCUDA::CUDAFunctionPreference
227SemaCUDA::IdentifyPreference(const FunctionDecl *Caller,
228 const FunctionDecl *Callee) {
229 assert(Callee && "Callee must be valid.");
230
231 // Treat ctor/dtor as host device function in device var initializer to allow
232 // trivial ctor/dtor without device attr to be used. Non-trivial ctor/dtor
233 // will be diagnosed by checkAllowedInitializer.
234 if (Caller == nullptr && CurCUDATargetCtx.Kind == CTCK_InitGlobalVar &&
235 CurCUDATargetCtx.Target == CUDAFunctionTarget::Device &&
236 (isa<CXXConstructorDecl>(Val: Callee) || isa<CXXDestructorDecl>(Val: Callee)))
237 return CFP_HostDevice;
238
239 CUDAFunctionTarget CallerTarget = IdentifyTarget(D: Caller);
240 CUDAFunctionTarget CalleeTarget = IdentifyTarget(D: Callee);
241
242 // If one of the targets is invalid, the check always fails, no matter what
243 // the other target is.
244 if (CallerTarget == CUDAFunctionTarget::InvalidTarget ||
245 CalleeTarget == CUDAFunctionTarget::InvalidTarget)
246 return CFP_Never;
247
248 // (a) Can't call global from some contexts until we support CUDA's
249 // dynamic parallelism.
250 if (CalleeTarget == CUDAFunctionTarget::Global &&
251 (CallerTarget == CUDAFunctionTarget::Global ||
252 CallerTarget == CUDAFunctionTarget::Device))
253 return CFP_Never;
254
255 // (b) Calling HostDevice is OK for everyone.
256 if (CalleeTarget == CUDAFunctionTarget::HostDevice)
257 return CFP_HostDevice;
258
259 // (c) Best case scenarios
260 if (CalleeTarget == CallerTarget ||
261 (CallerTarget == CUDAFunctionTarget::Host &&
262 CalleeTarget == CUDAFunctionTarget::Global) ||
263 (CallerTarget == CUDAFunctionTarget::Global &&
264 CalleeTarget == CUDAFunctionTarget::Device))
265 return CFP_Native;
266
267 // HipStdPar mode is special, in that assessing whether a device side call to
268 // a host target is deferred to a subsequent pass, and cannot unambiguously be
269 // adjudicated in the AST, hence we optimistically allow them to pass here.
270 if (getLangOpts().HIPStdPar &&
271 (CallerTarget == CUDAFunctionTarget::Global ||
272 CallerTarget == CUDAFunctionTarget::Device ||
273 CallerTarget == CUDAFunctionTarget::HostDevice) &&
274 CalleeTarget == CUDAFunctionTarget::Host)
275 return CFP_HostDevice;
276
277 // (d) HostDevice behavior depends on compilation mode.
278 if (CallerTarget == CUDAFunctionTarget::HostDevice) {
279 // It's OK to call a compilation-mode matching function from an HD one.
280 if ((getLangOpts().CUDAIsDevice &&
281 CalleeTarget == CUDAFunctionTarget::Device) ||
282 (!getLangOpts().CUDAIsDevice &&
283 (CalleeTarget == CUDAFunctionTarget::Host ||
284 CalleeTarget == CUDAFunctionTarget::Global)))
285 return CFP_SameSide;
286
287 // Calls from HD to non-mode-matching functions (i.e., to host functions
288 // when compiling in device mode or to device functions when compiling in
289 // host mode) are allowed at the sema level, but eventually rejected if
290 // they're ever codegened. TODO: Reject said calls earlier.
291 return CFP_WrongSide;
292 }
293
294 // (e) Calling across device/host boundary is not something you should do.
295 if ((CallerTarget == CUDAFunctionTarget::Host &&
296 CalleeTarget == CUDAFunctionTarget::Device) ||
297 (CallerTarget == CUDAFunctionTarget::Device &&
298 CalleeTarget == CUDAFunctionTarget::Host) ||
299 (CallerTarget == CUDAFunctionTarget::Global &&
300 CalleeTarget == CUDAFunctionTarget::Host))
301 return CFP_Never;
302
303 llvm_unreachable("All cases should've been handled by now.");
304}
305
306template <typename AttrT> static bool hasImplicitAttr(const FunctionDecl *D) {
307 if (!D)
308 return false;
309 if (auto *A = D->getAttr<AttrT>())
310 return A->isImplicit();
311 return D->isImplicit();
312}
313
314bool SemaCUDA::isImplicitHostDeviceFunction(const FunctionDecl *D) {
315 bool IsImplicitDevAttr = hasImplicitAttr<CUDADeviceAttr>(D);
316 bool IsImplicitHostAttr = hasImplicitAttr<CUDAHostAttr>(D);
317 return IsImplicitDevAttr && IsImplicitHostAttr;
318}
319
320void SemaCUDA::EraseUnwantedMatches(
321 const FunctionDecl *Caller,
322 SmallVectorImpl<std::pair<DeclAccessPair, FunctionDecl *>> &Matches) {
323 if (Matches.size() <= 1)
324 return;
325
326 using Pair = std::pair<DeclAccessPair, FunctionDecl*>;
327
328 // Gets the CUDA function preference for a call from Caller to Match.
329 auto GetCFP = [&](const Pair &Match) {
330 return IdentifyPreference(Caller, Callee: Match.second);
331 };
332
333 // Find the best call preference among the functions in Matches.
334 CUDAFunctionPreference BestCFP = GetCFP(*std::max_element(
335 first: Matches.begin(), last: Matches.end(),
336 comp: [&](const Pair &M1, const Pair &M2) { return GetCFP(M1) < GetCFP(M2); }));
337
338 // Erase all functions with lower priority.
339 llvm::erase_if(C&: Matches,
340 P: [&](const Pair &Match) { return GetCFP(Match) < BestCFP; });
341}
342
343/// When an implicitly-declared special member has to invoke more than one
344/// base/field special member, conflicts may occur in the targets of these
345/// members. For example, if one base's member __host__ and another's is
346/// __device__, it's a conflict.
347/// This function figures out if the given targets \param Target1 and
348/// \param Target2 conflict, and if they do not it fills in
349/// \param ResolvedTarget with a target that resolves for both calls.
350/// \return true if there's a conflict, false otherwise.
351static bool
352resolveCalleeCUDATargetConflict(CUDAFunctionTarget Target1,
353 CUDAFunctionTarget Target2,
354 CUDAFunctionTarget *ResolvedTarget) {
355 // Only free functions and static member functions may be global.
356 assert(Target1 != CUDAFunctionTarget::Global);
357 assert(Target2 != CUDAFunctionTarget::Global);
358
359 if (Target1 == CUDAFunctionTarget::HostDevice) {
360 *ResolvedTarget = Target2;
361 } else if (Target2 == CUDAFunctionTarget::HostDevice) {
362 *ResolvedTarget = Target1;
363 } else if (Target1 != Target2) {
364 return true;
365 } else {
366 *ResolvedTarget = Target1;
367 }
368
369 return false;
370}
371
372bool SemaCUDA::inferTargetForImplicitSpecialMember(CXXRecordDecl *ClassDecl,
373 CXXSpecialMemberKind CSM,
374 CXXMethodDecl *MemberDecl,
375 bool ConstRHS,
376 bool Diagnose) {
377 // If the defaulted special member is defined lexically outside of its
378 // owning class, or the special member already has explicit device or host
379 // attributes, do not infer.
380 bool InClass = MemberDecl->getLexicalParent() == MemberDecl->getParent();
381 bool HasH = MemberDecl->hasAttr<CUDAHostAttr>();
382 bool HasD = MemberDecl->hasAttr<CUDADeviceAttr>();
383 bool HasExplicitAttr =
384 (HasD && !MemberDecl->getAttr<CUDADeviceAttr>()->isImplicit()) ||
385 (HasH && !MemberDecl->getAttr<CUDAHostAttr>()->isImplicit());
386 if (!InClass || HasExplicitAttr)
387 return false;
388
389 std::optional<CUDAFunctionTarget> InferredTarget;
390
391 // We're going to invoke special member lookup; mark that these special
392 // members are called from this one, and not from its caller.
393 Sema::ContextRAII MethodContext(SemaRef, MemberDecl);
394
395 // Look for special members in base classes that should be invoked from here.
396 // Infer the target of this member base on the ones it should call.
397 // Skip direct and indirect virtual bases for abstract classes.
398 llvm::SmallVector<const CXXBaseSpecifier *, 16> Bases;
399 for (const auto &B : ClassDecl->bases()) {
400 if (!B.isVirtual()) {
401 Bases.push_back(Elt: &B);
402 }
403 }
404
405 if (!ClassDecl->isAbstract()) {
406 llvm::append_range(C&: Bases, R: llvm::make_pointer_range(Range: ClassDecl->vbases()));
407 }
408
409 for (const auto *B : Bases) {
410 const RecordType *BaseType = B->getType()->getAs<RecordType>();
411 if (!BaseType) {
412 continue;
413 }
414
415 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(Val: BaseType->getDecl());
416 Sema::SpecialMemberOverloadResult SMOR =
417 SemaRef.LookupSpecialMember(D: BaseClassDecl, SM: CSM,
418 /* ConstArg */ ConstRHS,
419 /* VolatileArg */ false,
420 /* RValueThis */ false,
421 /* ConstThis */ false,
422 /* VolatileThis */ false);
423
424 if (!SMOR.getMethod())
425 continue;
426
427 CUDAFunctionTarget BaseMethodTarget = IdentifyTarget(D: SMOR.getMethod());
428 if (!InferredTarget) {
429 InferredTarget = BaseMethodTarget;
430 } else {
431 bool ResolutionError = resolveCalleeCUDATargetConflict(
432 Target1: *InferredTarget, Target2: BaseMethodTarget, ResolvedTarget: &*InferredTarget);
433 if (ResolutionError) {
434 if (Diagnose) {
435 Diag(Loc: ClassDecl->getLocation(),
436 DiagID: diag::note_implicit_member_target_infer_collision)
437 << (unsigned)CSM << llvm::to_underlying(E: *InferredTarget)
438 << llvm::to_underlying(E: BaseMethodTarget);
439 }
440 MemberDecl->addAttr(
441 A: CUDAInvalidTargetAttr::CreateImplicit(Ctx&: getASTContext()));
442 return true;
443 }
444 }
445 }
446
447 // Same as for bases, but now for special members of fields.
448 for (const auto *F : ClassDecl->fields()) {
449 if (F->isInvalidDecl()) {
450 continue;
451 }
452
453 const RecordType *FieldType =
454 getASTContext().getBaseElementType(QT: F->getType())->getAs<RecordType>();
455 if (!FieldType) {
456 continue;
457 }
458
459 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(Val: FieldType->getDecl());
460 Sema::SpecialMemberOverloadResult SMOR =
461 SemaRef.LookupSpecialMember(D: FieldRecDecl, SM: CSM,
462 /* ConstArg */ ConstRHS && !F->isMutable(),
463 /* VolatileArg */ false,
464 /* RValueThis */ false,
465 /* ConstThis */ false,
466 /* VolatileThis */ false);
467
468 if (!SMOR.getMethod())
469 continue;
470
471 CUDAFunctionTarget FieldMethodTarget = IdentifyTarget(D: SMOR.getMethod());
472 if (!InferredTarget) {
473 InferredTarget = FieldMethodTarget;
474 } else {
475 bool ResolutionError = resolveCalleeCUDATargetConflict(
476 Target1: *InferredTarget, Target2: FieldMethodTarget, ResolvedTarget: &*InferredTarget);
477 if (ResolutionError) {
478 if (Diagnose) {
479 Diag(Loc: ClassDecl->getLocation(),
480 DiagID: diag::note_implicit_member_target_infer_collision)
481 << (unsigned)CSM << llvm::to_underlying(E: *InferredTarget)
482 << llvm::to_underlying(E: FieldMethodTarget);
483 }
484 MemberDecl->addAttr(
485 A: CUDAInvalidTargetAttr::CreateImplicit(Ctx&: getASTContext()));
486 return true;
487 }
488 }
489 }
490
491
492 // If no target was inferred, mark this member as __host__ __device__;
493 // it's the least restrictive option that can be invoked from any target.
494 bool NeedsH = true, NeedsD = true;
495 if (InferredTarget) {
496 if (*InferredTarget == CUDAFunctionTarget::Device)
497 NeedsH = false;
498 else if (*InferredTarget == CUDAFunctionTarget::Host)
499 NeedsD = false;
500 }
501
502 // We either setting attributes first time, or the inferred ones must match
503 // previously set ones.
504 if (NeedsD && !HasD)
505 MemberDecl->addAttr(A: CUDADeviceAttr::CreateImplicit(Ctx&: getASTContext()));
506 if (NeedsH && !HasH)
507 MemberDecl->addAttr(A: CUDAHostAttr::CreateImplicit(Ctx&: getASTContext()));
508
509 return false;
510}
511
512bool SemaCUDA::isEmptyConstructor(SourceLocation Loc, CXXConstructorDecl *CD) {
513 if (!CD->isDefined() && CD->isTemplateInstantiation())
514 SemaRef.InstantiateFunctionDefinition(PointOfInstantiation: Loc, Function: CD->getFirstDecl());
515
516 // (E.2.3.1, CUDA 7.5) A constructor for a class type is considered
517 // empty at a point in the translation unit, if it is either a
518 // trivial constructor
519 if (CD->isTrivial())
520 return true;
521
522 // ... or it satisfies all of the following conditions:
523 // The constructor function has been defined.
524 // The constructor function has no parameters,
525 // and the function body is an empty compound statement.
526 if (!(CD->hasTrivialBody() && CD->getNumParams() == 0))
527 return false;
528
529 // Its class has no virtual functions and no virtual base classes.
530 if (CD->getParent()->isDynamicClass())
531 return false;
532
533 // Union ctor does not call ctors of its data members.
534 if (CD->getParent()->isUnion())
535 return true;
536
537 // The only form of initializer allowed is an empty constructor.
538 // This will recursively check all base classes and member initializers
539 if (!llvm::all_of(Range: CD->inits(), P: [&](const CXXCtorInitializer *CI) {
540 if (const CXXConstructExpr *CE =
541 dyn_cast<CXXConstructExpr>(Val: CI->getInit()))
542 return isEmptyConstructor(Loc, CD: CE->getConstructor());
543 return false;
544 }))
545 return false;
546
547 return true;
548}
549
550bool SemaCUDA::isEmptyDestructor(SourceLocation Loc, CXXDestructorDecl *DD) {
551 // No destructor -> no problem.
552 if (!DD)
553 return true;
554
555 if (!DD->isDefined() && DD->isTemplateInstantiation())
556 SemaRef.InstantiateFunctionDefinition(PointOfInstantiation: Loc, Function: DD->getFirstDecl());
557
558 // (E.2.3.1, CUDA 7.5) A destructor for a class type is considered
559 // empty at a point in the translation unit, if it is either a
560 // trivial constructor
561 if (DD->isTrivial())
562 return true;
563
564 // ... or it satisfies all of the following conditions:
565 // The destructor function has been defined.
566 // and the function body is an empty compound statement.
567 if (!DD->hasTrivialBody())
568 return false;
569
570 const CXXRecordDecl *ClassDecl = DD->getParent();
571
572 // Its class has no virtual functions and no virtual base classes.
573 if (ClassDecl->isDynamicClass())
574 return false;
575
576 // Union does not have base class and union dtor does not call dtors of its
577 // data members.
578 if (DD->getParent()->isUnion())
579 return true;
580
581 // Only empty destructors are allowed. This will recursively check
582 // destructors for all base classes...
583 if (!llvm::all_of(Range: ClassDecl->bases(), P: [&](const CXXBaseSpecifier &BS) {
584 if (CXXRecordDecl *RD = BS.getType()->getAsCXXRecordDecl())
585 return isEmptyDestructor(Loc, DD: RD->getDestructor());
586 return true;
587 }))
588 return false;
589
590 // ... and member fields.
591 if (!llvm::all_of(Range: ClassDecl->fields(), P: [&](const FieldDecl *Field) {
592 if (CXXRecordDecl *RD = Field->getType()
593 ->getBaseElementTypeUnsafe()
594 ->getAsCXXRecordDecl())
595 return isEmptyDestructor(Loc, DD: RD->getDestructor());
596 return true;
597 }))
598 return false;
599
600 return true;
601}
602
603namespace {
604enum CUDAInitializerCheckKind {
605 CICK_DeviceOrConstant, // Check initializer for device/constant variable
606 CICK_Shared, // Check initializer for shared variable
607};
608
609bool IsDependentVar(VarDecl *VD) {
610 if (VD->getType()->isDependentType())
611 return true;
612 if (const auto *Init = VD->getInit())
613 return Init->isValueDependent();
614 return false;
615}
616
617// Check whether a variable has an allowed initializer for a CUDA device side
618// variable with global storage. \p VD may be a host variable to be checked for
619// potential promotion to device side variable.
620//
621// CUDA/HIP allows only empty constructors as initializers for global
622// variables (see E.2.3.1, CUDA 7.5). The same restriction also applies to all
623// __shared__ variables whether they are local or not (they all are implicitly
624// static in CUDA). One exception is that CUDA allows constant initializers
625// for __constant__ and __device__ variables.
626bool HasAllowedCUDADeviceStaticInitializer(SemaCUDA &S, VarDecl *VD,
627 CUDAInitializerCheckKind CheckKind) {
628 assert(!VD->isInvalidDecl() && VD->hasGlobalStorage());
629 assert(!IsDependentVar(VD) && "do not check dependent var");
630 const Expr *Init = VD->getInit();
631 auto IsEmptyInit = [&](const Expr *Init) {
632 if (!Init)
633 return true;
634 if (const auto *CE = dyn_cast<CXXConstructExpr>(Val: Init)) {
635 return S.isEmptyConstructor(Loc: VD->getLocation(), CD: CE->getConstructor());
636 }
637 return false;
638 };
639 auto IsConstantInit = [&](const Expr *Init) {
640 assert(Init);
641 ASTContext::CUDAConstantEvalContextRAII EvalCtx(S.getASTContext(),
642 /*NoWronSidedVars=*/true);
643 return Init->isConstantInitializer(Ctx&: S.getASTContext(),
644 ForRef: VD->getType()->isReferenceType());
645 };
646 auto HasEmptyDtor = [&](VarDecl *VD) {
647 if (const auto *RD = VD->getType()->getAsCXXRecordDecl())
648 return S.isEmptyDestructor(Loc: VD->getLocation(), DD: RD->getDestructor());
649 return true;
650 };
651 if (CheckKind == CICK_Shared)
652 return IsEmptyInit(Init) && HasEmptyDtor(VD);
653 return S.getLangOpts().GPUAllowDeviceInit ||
654 ((IsEmptyInit(Init) || IsConstantInit(Init)) && HasEmptyDtor(VD));
655}
656} // namespace
657
658void SemaCUDA::checkAllowedInitializer(VarDecl *VD) {
659 // Return early if VD is inside a non-instantiated template function since
660 // the implicit constructor is not defined yet.
661 if (const FunctionDecl *FD =
662 dyn_cast_or_null<FunctionDecl>(Val: VD->getDeclContext()))
663 if (FD->isDependentContext())
664 return;
665
666 // Do not check dependent variables since the ctor/dtor/initializer are not
667 // determined. Do it after instantiation.
668 if (VD->isInvalidDecl() || !VD->hasInit() || !VD->hasGlobalStorage() ||
669 IsDependentVar(VD))
670 return;
671 const Expr *Init = VD->getInit();
672 bool IsSharedVar = VD->hasAttr<CUDASharedAttr>();
673 bool IsDeviceOrConstantVar =
674 !IsSharedVar &&
675 (VD->hasAttr<CUDADeviceAttr>() || VD->hasAttr<CUDAConstantAttr>());
676 if (IsDeviceOrConstantVar || IsSharedVar) {
677 if (HasAllowedCUDADeviceStaticInitializer(
678 S&: *this, VD, CheckKind: IsSharedVar ? CICK_Shared : CICK_DeviceOrConstant))
679 return;
680 Diag(Loc: VD->getLocation(),
681 DiagID: IsSharedVar ? diag::err_shared_var_init : diag::err_dynamic_var_init)
682 << Init->getSourceRange();
683 VD->setInvalidDecl();
684 } else {
685 // This is a host-side global variable. Check that the initializer is
686 // callable from the host side.
687 const FunctionDecl *InitFn = nullptr;
688 if (const CXXConstructExpr *CE = dyn_cast<CXXConstructExpr>(Val: Init)) {
689 InitFn = CE->getConstructor();
690 } else if (const CallExpr *CE = dyn_cast<CallExpr>(Val: Init)) {
691 InitFn = CE->getDirectCallee();
692 }
693 if (InitFn) {
694 CUDAFunctionTarget InitFnTarget = IdentifyTarget(D: InitFn);
695 if (InitFnTarget != CUDAFunctionTarget::Host &&
696 InitFnTarget != CUDAFunctionTarget::HostDevice) {
697 Diag(Loc: VD->getLocation(), DiagID: diag::err_ref_bad_target_global_initializer)
698 << llvm::to_underlying(E: InitFnTarget) << InitFn;
699 Diag(Loc: InitFn->getLocation(), DiagID: diag::note_previous_decl) << InitFn;
700 VD->setInvalidDecl();
701 }
702 }
703 }
704}
705
706void SemaCUDA::RecordImplicitHostDeviceFuncUsedByDevice(
707 const FunctionDecl *Callee) {
708 FunctionDecl *Caller = SemaRef.getCurFunctionDecl(/*AllowLambda=*/true);
709 if (!Caller)
710 return;
711
712 if (!isImplicitHostDeviceFunction(D: Callee))
713 return;
714
715 CUDAFunctionTarget CallerTarget = IdentifyTarget(D: Caller);
716
717 // Record whether an implicit host device function is used on device side.
718 if (CallerTarget != CUDAFunctionTarget::Device &&
719 CallerTarget != CUDAFunctionTarget::Global &&
720 (CallerTarget != CUDAFunctionTarget::HostDevice ||
721 (isImplicitHostDeviceFunction(D: Caller) &&
722 !getASTContext().CUDAImplicitHostDeviceFunUsedByDevice.count(V: Caller))))
723 return;
724
725 getASTContext().CUDAImplicitHostDeviceFunUsedByDevice.insert(V: Callee);
726}
727
728// With -fcuda-host-device-constexpr, an unattributed constexpr function is
729// treated as implicitly __host__ __device__, unless:
730// * it is a variadic function (device-side variadic functions are not
731// allowed), or
732// * a __device__ function with this signature was already declared, in which
733// case in which case we output an error, unless the __device__ decl is in a
734// system header, in which case we leave the constexpr function unattributed.
735//
736// In addition, all function decls are treated as __host__ __device__ when
737// ForceHostDeviceDepth > 0 (corresponding to code within a
738// #pragma clang force_cuda_host_device_begin/end
739// pair).
740void SemaCUDA::maybeAddHostDeviceAttrs(FunctionDecl *NewD,
741 const LookupResult &Previous) {
742 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
743
744 if (ForceHostDeviceDepth > 0) {
745 if (!NewD->hasAttr<CUDAHostAttr>())
746 NewD->addAttr(A: CUDAHostAttr::CreateImplicit(Ctx&: getASTContext()));
747 if (!NewD->hasAttr<CUDADeviceAttr>())
748 NewD->addAttr(A: CUDADeviceAttr::CreateImplicit(Ctx&: getASTContext()));
749 return;
750 }
751
752 // If a template function has no host/device/global attributes,
753 // make it implicitly host device function.
754 if (getLangOpts().OffloadImplicitHostDeviceTemplates &&
755 !NewD->hasAttr<CUDAHostAttr>() && !NewD->hasAttr<CUDADeviceAttr>() &&
756 !NewD->hasAttr<CUDAGlobalAttr>() &&
757 (NewD->getDescribedFunctionTemplate() ||
758 NewD->isFunctionTemplateSpecialization())) {
759 NewD->addAttr(A: CUDAHostAttr::CreateImplicit(Ctx&: getASTContext()));
760 NewD->addAttr(A: CUDADeviceAttr::CreateImplicit(Ctx&: getASTContext()));
761 return;
762 }
763
764 if (!getLangOpts().CUDAHostDeviceConstexpr || !NewD->isConstexpr() ||
765 NewD->isVariadic() || NewD->hasAttr<CUDAHostAttr>() ||
766 NewD->hasAttr<CUDADeviceAttr>() || NewD->hasAttr<CUDAGlobalAttr>())
767 return;
768
769 // Is D a __device__ function with the same signature as NewD, ignoring CUDA
770 // attributes?
771 auto IsMatchingDeviceFn = [&](NamedDecl *D) {
772 if (UsingShadowDecl *Using = dyn_cast<UsingShadowDecl>(Val: D))
773 D = Using->getTargetDecl();
774 FunctionDecl *OldD = D->getAsFunction();
775 return OldD && OldD->hasAttr<CUDADeviceAttr>() &&
776 !OldD->hasAttr<CUDAHostAttr>() &&
777 !SemaRef.IsOverload(New: NewD, Old: OldD,
778 /* UseMemberUsingDeclRules = */ false,
779 /* ConsiderCudaAttrs = */ false);
780 };
781 auto It = llvm::find_if(Range: Previous, P: IsMatchingDeviceFn);
782 if (It != Previous.end()) {
783 // We found a __device__ function with the same name and signature as NewD
784 // (ignoring CUDA attrs). This is an error unless that function is defined
785 // in a system header, in which case we simply return without making NewD
786 // host+device.
787 NamedDecl *Match = *It;
788 if (!SemaRef.getSourceManager().isInSystemHeader(Loc: Match->getLocation())) {
789 Diag(Loc: NewD->getLocation(),
790 DiagID: diag::err_cuda_unattributed_constexpr_cannot_overload_device)
791 << NewD;
792 Diag(Loc: Match->getLocation(),
793 DiagID: diag::note_cuda_conflicting_device_function_declared_here);
794 }
795 return;
796 }
797
798 NewD->addAttr(A: CUDAHostAttr::CreateImplicit(Ctx&: getASTContext()));
799 NewD->addAttr(A: CUDADeviceAttr::CreateImplicit(Ctx&: getASTContext()));
800}
801
802// TODO: `__constant__` memory may be a limited resource for certain targets.
803// A safeguard may be needed at the end of compilation pipeline if
804// `__constant__` memory usage goes beyond limit.
805void SemaCUDA::MaybeAddConstantAttr(VarDecl *VD) {
806 // Do not promote dependent variables since the cotr/dtor/initializer are
807 // not determined. Do it after instantiation.
808 if (getLangOpts().CUDAIsDevice && !VD->hasAttr<CUDAConstantAttr>() &&
809 !VD->hasAttr<CUDASharedAttr>() &&
810 (VD->isFileVarDecl() || VD->isStaticDataMember()) &&
811 !IsDependentVar(VD) &&
812 ((VD->isConstexpr() || VD->getType().isConstQualified()) &&
813 HasAllowedCUDADeviceStaticInitializer(S&: *this, VD,
814 CheckKind: CICK_DeviceOrConstant))) {
815 VD->addAttr(A: CUDAConstantAttr::CreateImplicit(Ctx&: getASTContext()));
816 }
817}
818
819SemaBase::SemaDiagnosticBuilder SemaCUDA::DiagIfDeviceCode(SourceLocation Loc,
820 unsigned DiagID) {
821 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
822 FunctionDecl *CurFunContext =
823 SemaRef.getCurFunctionDecl(/*AllowLambda=*/true);
824 SemaDiagnosticBuilder::Kind DiagKind = [&] {
825 if (!CurFunContext)
826 return SemaDiagnosticBuilder::K_Nop;
827 switch (CurrentTarget()) {
828 case CUDAFunctionTarget::Global:
829 case CUDAFunctionTarget::Device:
830 return SemaDiagnosticBuilder::K_Immediate;
831 case CUDAFunctionTarget::HostDevice:
832 // An HD function counts as host code if we're compiling for host, and
833 // device code if we're compiling for device. Defer any errors in device
834 // mode until the function is known-emitted.
835 if (!getLangOpts().CUDAIsDevice)
836 return SemaDiagnosticBuilder::K_Nop;
837 if (SemaRef.IsLastErrorImmediate &&
838 getDiagnostics().getDiagnosticIDs()->isBuiltinNote(DiagID))
839 return SemaDiagnosticBuilder::K_Immediate;
840 return (SemaRef.getEmissionStatus(Decl: CurFunContext) ==
841 Sema::FunctionEmissionStatus::Emitted)
842 ? SemaDiagnosticBuilder::K_ImmediateWithCallStack
843 : SemaDiagnosticBuilder::K_Deferred;
844 default:
845 return SemaDiagnosticBuilder::K_Nop;
846 }
847 }();
848 return SemaDiagnosticBuilder(DiagKind, Loc, DiagID, CurFunContext, SemaRef);
849}
850
851Sema::SemaDiagnosticBuilder SemaCUDA::DiagIfHostCode(SourceLocation Loc,
852 unsigned DiagID) {
853 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
854 FunctionDecl *CurFunContext =
855 SemaRef.getCurFunctionDecl(/*AllowLambda=*/true);
856 SemaDiagnosticBuilder::Kind DiagKind = [&] {
857 if (!CurFunContext)
858 return SemaDiagnosticBuilder::K_Nop;
859 switch (CurrentTarget()) {
860 case CUDAFunctionTarget::Host:
861 return SemaDiagnosticBuilder::K_Immediate;
862 case CUDAFunctionTarget::HostDevice:
863 // An HD function counts as host code if we're compiling for host, and
864 // device code if we're compiling for device. Defer any errors in device
865 // mode until the function is known-emitted.
866 if (getLangOpts().CUDAIsDevice)
867 return SemaDiagnosticBuilder::K_Nop;
868 if (SemaRef.IsLastErrorImmediate &&
869 getDiagnostics().getDiagnosticIDs()->isBuiltinNote(DiagID))
870 return SemaDiagnosticBuilder::K_Immediate;
871 return (SemaRef.getEmissionStatus(Decl: CurFunContext) ==
872 Sema::FunctionEmissionStatus::Emitted)
873 ? SemaDiagnosticBuilder::K_ImmediateWithCallStack
874 : SemaDiagnosticBuilder::K_Deferred;
875 default:
876 return SemaDiagnosticBuilder::K_Nop;
877 }
878 }();
879 return SemaDiagnosticBuilder(DiagKind, Loc, DiagID, CurFunContext, SemaRef);
880}
881
882bool SemaCUDA::CheckCall(SourceLocation Loc, FunctionDecl *Callee) {
883 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
884 assert(Callee && "Callee may not be null.");
885
886 const auto &ExprEvalCtx = SemaRef.currentEvaluationContext();
887 if (ExprEvalCtx.isUnevaluated() || ExprEvalCtx.isConstantEvaluated())
888 return true;
889
890 // FIXME: Is bailing out early correct here? Should we instead assume that
891 // the caller is a global initializer?
892 FunctionDecl *Caller = SemaRef.getCurFunctionDecl(/*AllowLambda=*/true);
893 if (!Caller)
894 return true;
895
896 // If the caller is known-emitted, mark the callee as known-emitted.
897 // Otherwise, mark the call in our call graph so we can traverse it later.
898 bool CallerKnownEmitted = SemaRef.getEmissionStatus(Decl: Caller) ==
899 Sema::FunctionEmissionStatus::Emitted;
900 SemaDiagnosticBuilder::Kind DiagKind = [this, Caller, Callee,
901 CallerKnownEmitted] {
902 switch (IdentifyPreference(Caller, Callee)) {
903 case CFP_Never:
904 case CFP_WrongSide:
905 assert(Caller && "Never/wrongSide calls require a non-null caller");
906 // If we know the caller will be emitted, we know this wrong-side call
907 // will be emitted, so it's an immediate error. Otherwise, defer the
908 // error until we know the caller is emitted.
909 return CallerKnownEmitted
910 ? SemaDiagnosticBuilder::K_ImmediateWithCallStack
911 : SemaDiagnosticBuilder::K_Deferred;
912 default:
913 return SemaDiagnosticBuilder::K_Nop;
914 }
915 }();
916
917 if (DiagKind == SemaDiagnosticBuilder::K_Nop) {
918 // For -fgpu-rdc, keep track of external kernels used by host functions.
919 if (getLangOpts().CUDAIsDevice && getLangOpts().GPURelocatableDeviceCode &&
920 Callee->hasAttr<CUDAGlobalAttr>() && !Callee->isDefined() &&
921 (!Caller || (!Caller->getDescribedFunctionTemplate() &&
922 getASTContext().GetGVALinkageForFunction(FD: Caller) ==
923 GVA_StrongExternal)))
924 getASTContext().CUDAExternalDeviceDeclODRUsedByHost.insert(V: Callee);
925 return true;
926 }
927
928 // Avoid emitting this error twice for the same location. Using a hashtable
929 // like this is unfortunate, but because we must continue parsing as normal
930 // after encountering a deferred error, it's otherwise very tricky for us to
931 // ensure that we only emit this deferred error once.
932 if (!LocsWithCUDACallDiags.insert(V: {.FD: Caller, .Loc: Loc}).second)
933 return true;
934
935 SemaDiagnosticBuilder(DiagKind, Loc, diag::err_ref_bad_target, Caller,
936 SemaRef)
937 << llvm::to_underlying(E: IdentifyTarget(D: Callee)) << /*function*/ 0 << Callee
938 << llvm::to_underlying(E: IdentifyTarget(D: Caller));
939 if (!Callee->getBuiltinID())
940 SemaDiagnosticBuilder(DiagKind, Callee->getLocation(),
941 diag::note_previous_decl, Caller, SemaRef)
942 << Callee;
943 return DiagKind != SemaDiagnosticBuilder::K_Immediate &&
944 DiagKind != SemaDiagnosticBuilder::K_ImmediateWithCallStack;
945}
946
947// Check the wrong-sided reference capture of lambda for CUDA/HIP.
948// A lambda function may capture a stack variable by reference when it is
949// defined and uses the capture by reference when the lambda is called. When
950// the capture and use happen on different sides, the capture is invalid and
951// should be diagnosed.
952void SemaCUDA::CheckLambdaCapture(CXXMethodDecl *Callee,
953 const sema::Capture &Capture) {
954 // In host compilation we only need to check lambda functions emitted on host
955 // side. In such lambda functions, a reference capture is invalid only
956 // if the lambda structure is populated by a device function or kernel then
957 // is passed to and called by a host function. However that is impossible,
958 // since a device function or kernel can only call a device function, also a
959 // kernel cannot pass a lambda back to a host function since we cannot
960 // define a kernel argument type which can hold the lambda before the lambda
961 // itself is defined.
962 if (!getLangOpts().CUDAIsDevice)
963 return;
964
965 // File-scope lambda can only do init captures for global variables, which
966 // results in passing by value for these global variables.
967 FunctionDecl *Caller = SemaRef.getCurFunctionDecl(/*AllowLambda=*/true);
968 if (!Caller)
969 return;
970
971 // In device compilation, we only need to check lambda functions which are
972 // emitted on device side. For such lambdas, a reference capture is invalid
973 // only if the lambda structure is populated by a host function then passed
974 // to and called in a device function or kernel.
975 bool CalleeIsDevice = Callee->hasAttr<CUDADeviceAttr>();
976 bool CallerIsHost =
977 !Caller->hasAttr<CUDAGlobalAttr>() && !Caller->hasAttr<CUDADeviceAttr>();
978 bool ShouldCheck = CalleeIsDevice && CallerIsHost;
979 if (!ShouldCheck || !Capture.isReferenceCapture())
980 return;
981 auto DiagKind = SemaDiagnosticBuilder::K_Deferred;
982 if (Capture.isVariableCapture() && !getLangOpts().HIPStdPar) {
983 SemaDiagnosticBuilder(DiagKind, Capture.getLocation(),
984 diag::err_capture_bad_target, Callee, SemaRef)
985 << Capture.getVariable();
986 } else if (Capture.isThisCapture()) {
987 // Capture of this pointer is allowed since this pointer may be pointing to
988 // managed memory which is accessible on both device and host sides. It only
989 // results in invalid memory access if this pointer points to memory not
990 // accessible on device side.
991 SemaDiagnosticBuilder(DiagKind, Capture.getLocation(),
992 diag::warn_maybe_capture_bad_target_this_ptr, Callee,
993 SemaRef);
994 }
995}
996
997void SemaCUDA::SetLambdaAttrs(CXXMethodDecl *Method) {
998 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
999 if (Method->hasAttr<CUDAHostAttr>() || Method->hasAttr<CUDADeviceAttr>())
1000 return;
1001 Method->addAttr(A: CUDADeviceAttr::CreateImplicit(Ctx&: getASTContext()));
1002 Method->addAttr(A: CUDAHostAttr::CreateImplicit(Ctx&: getASTContext()));
1003}
1004
1005void SemaCUDA::checkTargetOverload(FunctionDecl *NewFD,
1006 const LookupResult &Previous) {
1007 assert(getLangOpts().CUDA && "Should only be called during CUDA compilation");
1008 CUDAFunctionTarget NewTarget = IdentifyTarget(D: NewFD);
1009 for (NamedDecl *OldND : Previous) {
1010 FunctionDecl *OldFD = OldND->getAsFunction();
1011 if (!OldFD)
1012 continue;
1013
1014 CUDAFunctionTarget OldTarget = IdentifyTarget(D: OldFD);
1015 // Don't allow HD and global functions to overload other functions with the
1016 // same signature. We allow overloading based on CUDA attributes so that
1017 // functions can have different implementations on the host and device, but
1018 // HD/global functions "exist" in some sense on both the host and device, so
1019 // should have the same implementation on both sides.
1020 if (NewTarget != OldTarget &&
1021 !SemaRef.IsOverload(New: NewFD, Old: OldFD, /* UseMemberUsingDeclRules = */ false,
1022 /* ConsiderCudaAttrs = */ false)) {
1023 if ((NewTarget == CUDAFunctionTarget::HostDevice &&
1024 !(getLangOpts().OffloadImplicitHostDeviceTemplates &&
1025 isImplicitHostDeviceFunction(D: NewFD) &&
1026 OldTarget == CUDAFunctionTarget::Device)) ||
1027 (OldTarget == CUDAFunctionTarget::HostDevice &&
1028 !(getLangOpts().OffloadImplicitHostDeviceTemplates &&
1029 isImplicitHostDeviceFunction(D: OldFD) &&
1030 NewTarget == CUDAFunctionTarget::Device)) ||
1031 (NewTarget == CUDAFunctionTarget::Global) ||
1032 (OldTarget == CUDAFunctionTarget::Global)) {
1033 Diag(Loc: NewFD->getLocation(), DiagID: diag::err_cuda_ovl_target)
1034 << llvm::to_underlying(E: NewTarget) << NewFD->getDeclName()
1035 << llvm::to_underlying(E: OldTarget) << OldFD;
1036 Diag(Loc: OldFD->getLocation(), DiagID: diag::note_previous_declaration);
1037 NewFD->setInvalidDecl();
1038 break;
1039 }
1040 if ((NewTarget == CUDAFunctionTarget::Host &&
1041 OldTarget == CUDAFunctionTarget::Device) ||
1042 (NewTarget == CUDAFunctionTarget::Device &&
1043 OldTarget == CUDAFunctionTarget::Host)) {
1044 Diag(Loc: NewFD->getLocation(), DiagID: diag::warn_offload_incompatible_redeclare)
1045 << llvm::to_underlying(E: NewTarget) << llvm::to_underlying(E: OldTarget);
1046 Diag(Loc: OldFD->getLocation(), DiagID: diag::note_previous_declaration);
1047 }
1048 }
1049 }
1050}
1051
1052template <typename AttrTy>
1053static void copyAttrIfPresent(Sema &S, FunctionDecl *FD,
1054 const FunctionDecl &TemplateFD) {
1055 if (AttrTy *Attribute = TemplateFD.getAttr<AttrTy>()) {
1056 AttrTy *Clone = Attribute->clone(S.Context);
1057 Clone->setInherited(true);
1058 FD->addAttr(A: Clone);
1059 }
1060}
1061
1062void SemaCUDA::inheritTargetAttrs(FunctionDecl *FD,
1063 const FunctionTemplateDecl &TD) {
1064 const FunctionDecl &TemplateFD = *TD.getTemplatedDecl();
1065 copyAttrIfPresent<CUDAGlobalAttr>(S&: SemaRef, FD, TemplateFD);
1066 copyAttrIfPresent<CUDAHostAttr>(S&: SemaRef, FD, TemplateFD);
1067 copyAttrIfPresent<CUDADeviceAttr>(S&: SemaRef, FD, TemplateFD);
1068}
1069
1070std::string SemaCUDA::getConfigureFuncName() const {
1071 if (getLangOpts().HIP)
1072 return getLangOpts().HIPUseNewLaunchAPI ? "__hipPushCallConfiguration"
1073 : "hipConfigureCall";
1074
1075 // New CUDA kernel launch sequence.
1076 if (CudaFeatureEnabled(getASTContext().getTargetInfo().getSDKVersion(),
1077 CudaFeature::CUDA_USES_NEW_LAUNCH))
1078 return "__cudaPushCallConfiguration";
1079
1080 // Legacy CUDA kernel configuration call
1081 return "cudaConfigureCall";
1082}
1083