| //===--- SemaCUDA.cpp - Semantic Analysis for CUDA constructs -------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| /// \file |
| /// \brief This file implements semantic analysis for CUDA constructs. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Sema/Sema.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/Lex/Preprocessor.h" |
| #include "clang/Sema/SemaDiagnostic.h" |
| #include "llvm/ADT/Optional.h" |
| #include "llvm/ADT/SmallVector.h" |
| using namespace clang; |
| |
| ExprResult Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc, |
| MultiExprArg ExecConfig, |
| SourceLocation GGGLoc) { |
| FunctionDecl *ConfigDecl = Context.getcudaConfigureCallDecl(); |
| if (!ConfigDecl) |
| return ExprError(Diag(LLLLoc, diag::err_undeclared_var_use) |
| << "cudaConfigureCall"); |
| QualType ConfigQTy = ConfigDecl->getType(); |
| |
| DeclRefExpr *ConfigDR = new (Context) |
| DeclRefExpr(ConfigDecl, false, ConfigQTy, VK_LValue, LLLLoc); |
| MarkFunctionReferenced(LLLLoc, ConfigDecl); |
| |
| return ActOnCallExpr(S, ConfigDR, LLLLoc, ExecConfig, GGGLoc, nullptr, |
| /*IsExecConfig=*/true); |
| } |
| |
| /// IdentifyCUDATarget - Determine the CUDA compilation target for this function |
| Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { |
| if (D->hasAttr<CUDAInvalidTargetAttr>()) |
| return CFT_InvalidTarget; |
| |
| if (D->hasAttr<CUDAGlobalAttr>()) |
| return CFT_Global; |
| |
| if (D->hasAttr<CUDADeviceAttr>()) { |
| if (D->hasAttr<CUDAHostAttr>()) |
| return CFT_HostDevice; |
| return CFT_Device; |
| } else if (D->hasAttr<CUDAHostAttr>()) { |
| return CFT_Host; |
| } else if (D->isImplicit()) { |
| // Some implicit declarations (like intrinsic functions) are not marked. |
| // Set the most lenient target on them for maximal flexibility. |
| return CFT_HostDevice; |
| } |
| |
| return CFT_Host; |
| } |
| |
| bool Sema::CheckCUDATarget(const FunctionDecl *Caller, |
| const FunctionDecl *Callee) { |
| // The CUDADisableTargetCallChecks short-circuits this check: we assume all |
| // cross-target calls are valid. |
| if (getLangOpts().CUDADisableTargetCallChecks) |
| return false; |
| |
| CUDAFunctionTarget CallerTarget = IdentifyCUDATarget(Caller), |
| CalleeTarget = IdentifyCUDATarget(Callee); |
| |
| // If one of the targets is invalid, the check always fails, no matter what |
| // the other target is. |
| if (CallerTarget == CFT_InvalidTarget || CalleeTarget == CFT_InvalidTarget) |
| return true; |
| |
| // CUDA B.1.1 "The __device__ qualifier declares a function that is [...] |
| // Callable from the device only." |
| if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) |
| return true; |
| |
| // CUDA B.1.2 "The __global__ qualifier declares a function that is [...] |
| // Callable from the host only." |
| // CUDA B.1.3 "The __host__ qualifier declares a function that is [...] |
| // Callable from the host only." |
| if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && |
| (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) |
| return true; |
| |
| // CUDA B.1.3 "The __device__ and __host__ qualifiers can be used together |
| // however, in which case the function is compiled for both the host and the |
| // device. The __CUDA_ARCH__ macro [...] can be used to differentiate code |
| // paths between host and device." |
| if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) { |
| // If the caller is implicit then the check always passes. |
| if (Caller->isImplicit()) return false; |
| |
| bool InDeviceMode = getLangOpts().CUDAIsDevice; |
| if (!InDeviceMode && CalleeTarget != CFT_Host) |
| return true; |
| if (InDeviceMode && CalleeTarget != CFT_Device) { |
| // Allow host device functions to call host functions if explicitly |
| // requested. |
| if (CalleeTarget == CFT_Host && |
| getLangOpts().CUDAAllowHostCallsFromHostDevice) { |
| Diag(Caller->getLocation(), |
| diag::warn_host_calls_from_host_device) |
| << Callee->getNameAsString() << Caller->getNameAsString(); |
| return false; |
| } |
| |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /// When an implicitly-declared special member has to invoke more than one |
| /// base/field special member, conflicts may occur in the targets of these |
| /// members. For example, if one base's member __host__ and another's is |
| /// __device__, it's a conflict. |
| /// This function figures out if the given targets \param Target1 and |
| /// \param Target2 conflict, and if they do not it fills in |
| /// \param ResolvedTarget with a target that resolves for both calls. |
| /// \return true if there's a conflict, false otherwise. |
| static bool |
| resolveCalleeCUDATargetConflict(Sema::CUDAFunctionTarget Target1, |
| Sema::CUDAFunctionTarget Target2, |
| Sema::CUDAFunctionTarget *ResolvedTarget) { |
| if (Target1 == Sema::CFT_Global && Target2 == Sema::CFT_Global) { |
| // TODO: this shouldn't happen, really. Methods cannot be marked __global__. |
| // Clang should detect this earlier and produce an error. Then this |
| // condition can be changed to an assertion. |
| return true; |
| } |
| |
| if (Target1 == Sema::CFT_HostDevice) { |
| *ResolvedTarget = Target2; |
| } else if (Target2 == Sema::CFT_HostDevice) { |
| *ResolvedTarget = Target1; |
| } else if (Target1 != Target2) { |
| return true; |
| } else { |
| *ResolvedTarget = Target1; |
| } |
| |
| return false; |
| } |
| |
| bool Sema::inferCUDATargetForImplicitSpecialMember(CXXRecordDecl *ClassDecl, |
| CXXSpecialMember CSM, |
| CXXMethodDecl *MemberDecl, |
| bool ConstRHS, |
| bool Diagnose) { |
| llvm::Optional<CUDAFunctionTarget> InferredTarget; |
| |
| // We're going to invoke special member lookup; mark that these special |
| // members are called from this one, and not from its caller. |
| ContextRAII MethodContext(*this, MemberDecl); |
| |
| // Look for special members in base classes that should be invoked from here. |
| // Infer the target of this member base on the ones it should call. |
| // Skip direct and indirect virtual bases for abstract classes. |
| llvm::SmallVector<const CXXBaseSpecifier *, 16> Bases; |
| for (const auto &B : ClassDecl->bases()) { |
| if (!B.isVirtual()) { |
| Bases.push_back(&B); |
| } |
| } |
| |
| if (!ClassDecl->isAbstract()) { |
| for (const auto &VB : ClassDecl->vbases()) { |
| Bases.push_back(&VB); |
| } |
| } |
| |
| for (const auto *B : Bases) { |
| const RecordType *BaseType = B->getType()->getAs<RecordType>(); |
| if (!BaseType) { |
| continue; |
| } |
| |
| CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); |
| Sema::SpecialMemberOverloadResult *SMOR = |
| LookupSpecialMember(BaseClassDecl, CSM, |
| /* ConstArg */ ConstRHS, |
| /* VolatileArg */ false, |
| /* RValueThis */ false, |
| /* ConstThis */ false, |
| /* VolatileThis */ false); |
| |
| if (!SMOR || !SMOR->getMethod()) { |
| continue; |
| } |
| |
| CUDAFunctionTarget BaseMethodTarget = IdentifyCUDATarget(SMOR->getMethod()); |
| if (!InferredTarget.hasValue()) { |
| InferredTarget = BaseMethodTarget; |
| } else { |
| bool ResolutionError = resolveCalleeCUDATargetConflict( |
| InferredTarget.getValue(), BaseMethodTarget, |
| InferredTarget.getPointer()); |
| if (ResolutionError) { |
| if (Diagnose) { |
| Diag(ClassDecl->getLocation(), |
| diag::note_implicit_member_target_infer_collision) |
| << (unsigned)CSM << InferredTarget.getValue() << BaseMethodTarget; |
| } |
| MemberDecl->addAttr(CUDAInvalidTargetAttr::CreateImplicit(Context)); |
| return true; |
| } |
| } |
| } |
| |
| // Same as for bases, but now for special members of fields. |
| for (const auto *F : ClassDecl->fields()) { |
| if (F->isInvalidDecl()) { |
| continue; |
| } |
| |
| const RecordType *FieldType = |
| Context.getBaseElementType(F->getType())->getAs<RecordType>(); |
| if (!FieldType) { |
| continue; |
| } |
| |
| CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(FieldType->getDecl()); |
| Sema::SpecialMemberOverloadResult *SMOR = |
| LookupSpecialMember(FieldRecDecl, CSM, |
| /* ConstArg */ ConstRHS && !F->isMutable(), |
| /* VolatileArg */ false, |
| /* RValueThis */ false, |
| /* ConstThis */ false, |
| /* VolatileThis */ false); |
| |
| if (!SMOR || !SMOR->getMethod()) { |
| continue; |
| } |
| |
| CUDAFunctionTarget FieldMethodTarget = |
| IdentifyCUDATarget(SMOR->getMethod()); |
| if (!InferredTarget.hasValue()) { |
| InferredTarget = FieldMethodTarget; |
| } else { |
| bool ResolutionError = resolveCalleeCUDATargetConflict( |
| InferredTarget.getValue(), FieldMethodTarget, |
| InferredTarget.getPointer()); |
| if (ResolutionError) { |
| if (Diagnose) { |
| Diag(ClassDecl->getLocation(), |
| diag::note_implicit_member_target_infer_collision) |
| << (unsigned)CSM << InferredTarget.getValue() |
| << FieldMethodTarget; |
| } |
| MemberDecl->addAttr(CUDAInvalidTargetAttr::CreateImplicit(Context)); |
| return true; |
| } |
| } |
| } |
| |
| if (InferredTarget.hasValue()) { |
| if (InferredTarget.getValue() == CFT_Device) { |
| MemberDecl->addAttr(CUDADeviceAttr::CreateImplicit(Context)); |
| } else if (InferredTarget.getValue() == CFT_Host) { |
| MemberDecl->addAttr(CUDAHostAttr::CreateImplicit(Context)); |
| } else { |
| MemberDecl->addAttr(CUDADeviceAttr::CreateImplicit(Context)); |
| MemberDecl->addAttr(CUDAHostAttr::CreateImplicit(Context)); |
| } |
| } else { |
| // If no target was inferred, mark this member as __host__ __device__; |
| // it's the least restrictive option that can be invoked from any target. |
| MemberDecl->addAttr(CUDADeviceAttr::CreateImplicit(Context)); |
| MemberDecl->addAttr(CUDAHostAttr::CreateImplicit(Context)); |
| } |
| |
| return false; |
| } |
