| //===--- SemaStmtAttr.cpp - Statement Attribute Handling ------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements stmt-related attribute processing. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/EvaluatedExprVisitor.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "clang/Sema/DelayedDiagnostic.h" |
| #include "clang/Sema/ParsedAttr.h" |
| #include "clang/Sema/ScopeInfo.h" |
| #include <optional> |
| |
| using namespace clang; |
| using namespace sema; |
| |
| static Attr *handleFallThroughAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| FallThroughAttr Attr(S.Context, A); |
| if (isa<SwitchCase>(St)) { |
| S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_wrong_target) |
| << A << St->getBeginLoc(); |
| SourceLocation L = S.getLocForEndOfToken(Range.getEnd()); |
| S.Diag(L, diag::note_fallthrough_insert_semi_fixit) |
| << FixItHint::CreateInsertion(L, ";"); |
| return nullptr; |
| } |
| auto *FnScope = S.getCurFunction(); |
| if (FnScope->SwitchStack.empty()) { |
| S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_outside_switch); |
| return nullptr; |
| } |
| |
| // If this is spelled as the standard C++17 attribute, but not in C++17, warn |
| // about using it as an extension. |
| if (!S.getLangOpts().CPlusPlus17 && A.isCXX11Attribute() && |
| !A.getScopeName()) |
| S.Diag(A.getLoc(), diag::ext_cxx17_attr) << A; |
| |
| FnScope->setHasFallthroughStmt(); |
| return ::new (S.Context) FallThroughAttr(S.Context, A); |
| } |
| |
| static Attr *handleSuppressAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| if (A.getAttributeSpellingListIndex() == SuppressAttr::CXX11_gsl_suppress && |
| A.getNumArgs() < 1) { |
| // Suppression attribute with GSL spelling requires at least 1 argument. |
| S.Diag(A.getLoc(), diag::err_attribute_too_few_arguments) << A << 1; |
| return nullptr; |
| } |
| |
| std::vector<StringRef> DiagnosticIdentifiers; |
| for (unsigned I = 0, E = A.getNumArgs(); I != E; ++I) { |
| StringRef RuleName; |
| |
| if (!S.checkStringLiteralArgumentAttr(A, I, RuleName, nullptr)) |
| return nullptr; |
| |
| DiagnosticIdentifiers.push_back(RuleName); |
| } |
| |
| return ::new (S.Context) SuppressAttr( |
| S.Context, A, DiagnosticIdentifiers.data(), DiagnosticIdentifiers.size()); |
| } |
| |
| static Attr *handleLoopHintAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange) { |
| IdentifierLoc *PragmaNameLoc = A.getArgAsIdent(0); |
| IdentifierLoc *OptionLoc = A.getArgAsIdent(1); |
| IdentifierLoc *StateLoc = A.getArgAsIdent(2); |
| Expr *ValueExpr = A.getArgAsExpr(3); |
| |
| StringRef PragmaName = |
| llvm::StringSwitch<StringRef>(PragmaNameLoc->Ident->getName()) |
| .Cases("unroll", "nounroll", "unroll_and_jam", "nounroll_and_jam", |
| PragmaNameLoc->Ident->getName()) |
| .Default("clang loop"); |
| |
| // This could be handled automatically by adding a Subjects definition in |
| // Attr.td, but that would make the diagnostic behavior worse in this case |
| // because the user spells this attribute as a pragma. |
| if (!isa<DoStmt, ForStmt, CXXForRangeStmt, WhileStmt>(St)) { |
| std::string Pragma = "#pragma " + std::string(PragmaName); |
| S.Diag(St->getBeginLoc(), diag::err_pragma_loop_precedes_nonloop) << Pragma; |
| return nullptr; |
| } |
| |
| LoopHintAttr::OptionType Option; |
| LoopHintAttr::LoopHintState State; |
| |
| auto SetHints = [&Option, &State](LoopHintAttr::OptionType O, |
| LoopHintAttr::LoopHintState S) { |
| Option = O; |
| State = S; |
| }; |
| |
| if (PragmaName == "nounroll") { |
| SetHints(LoopHintAttr::Unroll, LoopHintAttr::Disable); |
| } else if (PragmaName == "unroll") { |
| // #pragma unroll N |
| if (ValueExpr) { |
| if (!ValueExpr->isValueDependent()) { |
| auto Value = ValueExpr->EvaluateKnownConstInt(S.getASTContext()); |
| if (Value.isZero() || Value.isOne()) |
| SetHints(LoopHintAttr::Unroll, LoopHintAttr::Disable); |
| else |
| SetHints(LoopHintAttr::UnrollCount, LoopHintAttr::Numeric); |
| } else |
| SetHints(LoopHintAttr::UnrollCount, LoopHintAttr::Numeric); |
| } else |
| SetHints(LoopHintAttr::Unroll, LoopHintAttr::Enable); |
| } else if (PragmaName == "nounroll_and_jam") { |
| SetHints(LoopHintAttr::UnrollAndJam, LoopHintAttr::Disable); |
| } else if (PragmaName == "unroll_and_jam") { |
| // #pragma unroll_and_jam N |
| if (ValueExpr) |
| SetHints(LoopHintAttr::UnrollAndJamCount, LoopHintAttr::Numeric); |
| else |
| SetHints(LoopHintAttr::UnrollAndJam, LoopHintAttr::Enable); |
| } else { |
| // #pragma clang loop ... |
| assert(OptionLoc && OptionLoc->Ident && |
| "Attribute must have valid option info."); |
| Option = llvm::StringSwitch<LoopHintAttr::OptionType>( |
| OptionLoc->Ident->getName()) |
| .Case("vectorize", LoopHintAttr::Vectorize) |
| .Case("vectorize_width", LoopHintAttr::VectorizeWidth) |
| .Case("interleave", LoopHintAttr::Interleave) |
| .Case("vectorize_predicate", LoopHintAttr::VectorizePredicate) |
| .Case("interleave_count", LoopHintAttr::InterleaveCount) |
| .Case("unroll", LoopHintAttr::Unroll) |
| .Case("unroll_count", LoopHintAttr::UnrollCount) |
| .Case("pipeline", LoopHintAttr::PipelineDisabled) |
| .Case("pipeline_initiation_interval", |
| LoopHintAttr::PipelineInitiationInterval) |
| .Case("distribute", LoopHintAttr::Distribute) |
| .Default(LoopHintAttr::Vectorize); |
| if (Option == LoopHintAttr::VectorizeWidth) { |
| assert((ValueExpr || (StateLoc && StateLoc->Ident)) && |
| "Attribute must have a valid value expression or argument."); |
| if (ValueExpr && S.CheckLoopHintExpr(ValueExpr, St->getBeginLoc(), |
| /*AllowZero=*/false)) |
| return nullptr; |
| if (StateLoc && StateLoc->Ident && StateLoc->Ident->isStr("scalable")) |
| State = LoopHintAttr::ScalableWidth; |
| else |
| State = LoopHintAttr::FixedWidth; |
| } else if (Option == LoopHintAttr::InterleaveCount || |
| Option == LoopHintAttr::UnrollCount || |
| Option == LoopHintAttr::PipelineInitiationInterval) { |
| assert(ValueExpr && "Attribute must have a valid value expression."); |
| if (S.CheckLoopHintExpr(ValueExpr, St->getBeginLoc(), |
| /*AllowZero=*/false)) |
| return nullptr; |
| State = LoopHintAttr::Numeric; |
| } else if (Option == LoopHintAttr::Vectorize || |
| Option == LoopHintAttr::Interleave || |
| Option == LoopHintAttr::VectorizePredicate || |
| Option == LoopHintAttr::Unroll || |
| Option == LoopHintAttr::Distribute || |
| Option == LoopHintAttr::PipelineDisabled) { |
| assert(StateLoc && StateLoc->Ident && "Loop hint must have an argument"); |
| if (StateLoc->Ident->isStr("disable")) |
| State = LoopHintAttr::Disable; |
| else if (StateLoc->Ident->isStr("assume_safety")) |
| State = LoopHintAttr::AssumeSafety; |
| else if (StateLoc->Ident->isStr("full")) |
| State = LoopHintAttr::Full; |
| else if (StateLoc->Ident->isStr("enable")) |
| State = LoopHintAttr::Enable; |
| else |
| llvm_unreachable("bad loop hint argument"); |
| } else |
| llvm_unreachable("bad loop hint"); |
| } |
| |
| return LoopHintAttr::CreateImplicit(S.Context, Option, State, ValueExpr, A); |
| } |
| |
| namespace { |
| class CallExprFinder : public ConstEvaluatedExprVisitor<CallExprFinder> { |
| bool FoundAsmStmt = false; |
| std::vector<const CallExpr *> CallExprs; |
| |
| public: |
| typedef ConstEvaluatedExprVisitor<CallExprFinder> Inherited; |
| |
| CallExprFinder(Sema &S, const Stmt *St) : Inherited(S.Context) { Visit(St); } |
| |
| bool foundCallExpr() { return !CallExprs.empty(); } |
| const std::vector<const CallExpr *> &getCallExprs() { return CallExprs; } |
| |
| bool foundAsmStmt() { return FoundAsmStmt; } |
| |
| void VisitCallExpr(const CallExpr *E) { CallExprs.push_back(E); } |
| |
| void VisitAsmStmt(const AsmStmt *S) { FoundAsmStmt = true; } |
| |
| void Visit(const Stmt *St) { |
| if (!St) |
| return; |
| ConstEvaluatedExprVisitor<CallExprFinder>::Visit(St); |
| } |
| }; |
| } // namespace |
| |
| static Attr *handleNoMergeAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| CallExprFinder CEF(S, St); |
| |
| if (!CEF.foundCallExpr() && !CEF.foundAsmStmt()) { |
| S.Diag(St->getBeginLoc(), diag::warn_attribute_ignored_no_calls_in_stmt) |
| << A; |
| return nullptr; |
| } |
| |
| return ::new (S.Context) NoMergeAttr(S.Context, A); |
| } |
| |
| static Attr *handleNoConvergentAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| CallExprFinder CEF(S, St); |
| |
| if (!CEF.foundCallExpr() && !CEF.foundAsmStmt()) { |
| S.Diag(St->getBeginLoc(), diag::warn_attribute_ignored_no_calls_in_stmt) |
| << A; |
| return nullptr; |
| } |
| |
| return ::new (S.Context) NoConvergentAttr(S.Context, A); |
| } |
| |
| template <typename OtherAttr, int DiagIdx> |
| static bool CheckStmtInlineAttr(Sema &SemaRef, const Stmt *OrigSt, |
| const Stmt *CurSt, |
| const AttributeCommonInfo &A) { |
| CallExprFinder OrigCEF(SemaRef, OrigSt); |
| CallExprFinder CEF(SemaRef, CurSt); |
| |
| // If the call expressions lists are equal in size, we can skip |
| // previously emitted diagnostics. However, if the statement has a pack |
| // expansion, we have no way of telling which CallExpr is the instantiated |
| // version of the other. In this case, we will end up re-diagnosing in the |
| // instantiation. |
| // ie: [[clang::always_inline]] non_dependent(), (other_call<Pack>()...) |
| // will diagnose nondependent again. |
| bool CanSuppressDiag = |
| OrigSt && CEF.getCallExprs().size() == OrigCEF.getCallExprs().size(); |
| |
| if (!CEF.foundCallExpr()) { |
| return SemaRef.Diag(CurSt->getBeginLoc(), |
| diag::warn_attribute_ignored_no_calls_in_stmt) |
| << A; |
| } |
| |
| for (const auto &Tup : |
| llvm::zip_longest(OrigCEF.getCallExprs(), CEF.getCallExprs())) { |
| // If the original call expression already had a callee, we already |
| // diagnosed this, so skip it here. We can't skip if there isn't a 1:1 |
| // relationship between the two lists of call expressions. |
| if (!CanSuppressDiag || !(*std::get<0>(Tup))->getCalleeDecl()) { |
| const Decl *Callee = (*std::get<1>(Tup))->getCalleeDecl(); |
| if (Callee && |
| (Callee->hasAttr<OtherAttr>() || Callee->hasAttr<FlattenAttr>())) { |
| SemaRef.Diag(CurSt->getBeginLoc(), |
| diag::warn_function_stmt_attribute_precedence) |
| << A << (Callee->hasAttr<OtherAttr>() ? DiagIdx : 1); |
| SemaRef.Diag(Callee->getBeginLoc(), diag::note_conflicting_attribute); |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| bool Sema::CheckNoInlineAttr(const Stmt *OrigSt, const Stmt *CurSt, |
| const AttributeCommonInfo &A) { |
| return CheckStmtInlineAttr<AlwaysInlineAttr, 0>(*this, OrigSt, CurSt, A); |
| } |
| |
| bool Sema::CheckAlwaysInlineAttr(const Stmt *OrigSt, const Stmt *CurSt, |
| const AttributeCommonInfo &A) { |
| return CheckStmtInlineAttr<NoInlineAttr, 2>(*this, OrigSt, CurSt, A); |
| } |
| |
| static Attr *handleNoInlineAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| NoInlineAttr NIA(S.Context, A); |
| if (!NIA.isStmtNoInline()) { |
| S.Diag(St->getBeginLoc(), diag::warn_function_attribute_ignored_in_stmt) |
| << "[[clang::noinline]]"; |
| return nullptr; |
| } |
| |
| if (S.CheckNoInlineAttr(/*OrigSt=*/nullptr, St, A)) |
| return nullptr; |
| |
| return ::new (S.Context) NoInlineAttr(S.Context, A); |
| } |
| |
| static Attr *handleAlwaysInlineAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| AlwaysInlineAttr AIA(S.Context, A); |
| if (!AIA.isClangAlwaysInline()) { |
| S.Diag(St->getBeginLoc(), diag::warn_function_attribute_ignored_in_stmt) |
| << "[[clang::always_inline]]"; |
| return nullptr; |
| } |
| |
| if (S.CheckAlwaysInlineAttr(/*OrigSt=*/nullptr, St, A)) |
| return nullptr; |
| |
| return ::new (S.Context) AlwaysInlineAttr(S.Context, A); |
| } |
| |
| static Attr *handleCXXAssumeAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| ExprResult Res = S.ActOnCXXAssumeAttr(St, A, Range); |
| if (!Res.isUsable()) |
| return nullptr; |
| |
| return ::new (S.Context) CXXAssumeAttr(S.Context, A, Res.get()); |
| } |
| |
| static Attr *handleMustTailAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| // Validation is in Sema::ActOnAttributedStmt(). |
| return ::new (S.Context) MustTailAttr(S.Context, A); |
| } |
| |
| static Attr *handleLikely(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| |
| if (!S.getLangOpts().CPlusPlus20 && A.isCXX11Attribute() && !A.getScopeName()) |
| S.Diag(A.getLoc(), diag::ext_cxx20_attr) << A << Range; |
| |
| return ::new (S.Context) LikelyAttr(S.Context, A); |
| } |
| |
| static Attr *handleUnlikely(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| |
| if (!S.getLangOpts().CPlusPlus20 && A.isCXX11Attribute() && !A.getScopeName()) |
| S.Diag(A.getLoc(), diag::ext_cxx20_attr) << A << Range; |
| |
| return ::new (S.Context) UnlikelyAttr(S.Context, A); |
| } |
| |
| CodeAlignAttr *Sema::BuildCodeAlignAttr(const AttributeCommonInfo &CI, |
| Expr *E) { |
| if (!E->isValueDependent()) { |
| llvm::APSInt ArgVal; |
| ExprResult Res = VerifyIntegerConstantExpression(E, &ArgVal); |
| if (Res.isInvalid()) |
| return nullptr; |
| E = Res.get(); |
| |
| // This attribute requires an integer argument which is a constant power of |
| // two between 1 and 4096 inclusive. |
| if (ArgVal < CodeAlignAttr::MinimumAlignment || |
| ArgVal > CodeAlignAttr::MaximumAlignment || !ArgVal.isPowerOf2()) { |
| if (std::optional<int64_t> Value = ArgVal.trySExtValue()) |
| Diag(CI.getLoc(), diag::err_attribute_power_of_two_in_range) |
| << CI << CodeAlignAttr::MinimumAlignment |
| << CodeAlignAttr::MaximumAlignment << Value.value(); |
| else |
| Diag(CI.getLoc(), diag::err_attribute_power_of_two_in_range) |
| << CI << CodeAlignAttr::MinimumAlignment |
| << CodeAlignAttr::MaximumAlignment << E; |
| return nullptr; |
| } |
| } |
| return new (Context) CodeAlignAttr(Context, CI, E); |
| } |
| |
| static Attr *handleCodeAlignAttr(Sema &S, Stmt *St, const ParsedAttr &A) { |
| |
| Expr *E = A.getArgAsExpr(0); |
| return S.BuildCodeAlignAttr(A, E); |
| } |
| |
| // Diagnose non-identical duplicates as a 'conflicting' loop attributes |
| // and suppress duplicate errors in cases where the two match. |
| template <typename LoopAttrT> |
| static void CheckForDuplicateLoopAttrs(Sema &S, ArrayRef<const Attr *> Attrs) { |
| auto FindFunc = [](const Attr *A) { return isa<const LoopAttrT>(A); }; |
| const auto *FirstItr = std::find_if(Attrs.begin(), Attrs.end(), FindFunc); |
| |
| if (FirstItr == Attrs.end()) // no attributes found |
| return; |
| |
| const auto *LastFoundItr = FirstItr; |
| std::optional<llvm::APSInt> FirstValue; |
| |
| const auto *CAFA = |
| dyn_cast<ConstantExpr>(cast<LoopAttrT>(*FirstItr)->getAlignment()); |
| // Return early if first alignment expression is dependent (since we don't |
| // know what the effective size will be), and skip the loop entirely. |
| if (!CAFA) |
| return; |
| |
| while (Attrs.end() != (LastFoundItr = std::find_if(LastFoundItr + 1, |
| Attrs.end(), FindFunc))) { |
| const auto *CASA = |
| dyn_cast<ConstantExpr>(cast<LoopAttrT>(*LastFoundItr)->getAlignment()); |
| // If the value is dependent, we can not test anything. |
| if (!CASA) |
| return; |
| // Test the attribute values. |
| llvm::APSInt SecondValue = CASA->getResultAsAPSInt(); |
| if (!FirstValue) |
| FirstValue = CAFA->getResultAsAPSInt(); |
| |
| if (FirstValue != SecondValue) { |
| S.Diag((*LastFoundItr)->getLocation(), diag::err_loop_attr_conflict) |
| << *FirstItr; |
| S.Diag((*FirstItr)->getLocation(), diag::note_previous_attribute); |
| } |
| } |
| return; |
| } |
| |
| static Attr *handleMSConstexprAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| if (!S.getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2022_3)) { |
| S.Diag(A.getLoc(), diag::warn_unknown_attribute_ignored) |
| << A << A.getRange(); |
| return nullptr; |
| } |
| return ::new (S.Context) MSConstexprAttr(S.Context, A); |
| } |
| |
| #define WANT_STMT_MERGE_LOGIC |
| #include "clang/Sema/AttrParsedAttrImpl.inc" |
| #undef WANT_STMT_MERGE_LOGIC |
| |
| static void |
| CheckForIncompatibleAttributes(Sema &S, |
| const SmallVectorImpl<const Attr *> &Attrs) { |
| // The vast majority of attributed statements will only have one attribute |
| // on them, so skip all of the checking in the common case. |
| if (Attrs.size() < 2) |
| return; |
| |
| // First, check for the easy cases that are table-generated for us. |
| if (!DiagnoseMutualExclusions(S, Attrs)) |
| return; |
| |
| enum CategoryType { |
| // For the following categories, they come in two variants: a state form and |
| // a numeric form. The state form may be one of default, enable, and |
| // disable. The numeric form provides an integer hint (for example, unroll |
| // count) to the transformer. |
| Vectorize, |
| Interleave, |
| UnrollAndJam, |
| Pipeline, |
| // For unroll, default indicates full unrolling rather than enabling the |
| // transformation. |
| Unroll, |
| // The loop distribution transformation only has a state form that is |
| // exposed by #pragma clang loop distribute (enable | disable). |
| Distribute, |
| // The vector predication only has a state form that is exposed by |
| // #pragma clang loop vectorize_predicate (enable | disable). |
| VectorizePredicate, |
| // This serves as a indicator to how many category are listed in this enum. |
| NumberOfCategories |
| }; |
| // The following array accumulates the hints encountered while iterating |
| // through the attributes to check for compatibility. |
| struct { |
| const LoopHintAttr *StateAttr; |
| const LoopHintAttr *NumericAttr; |
| } HintAttrs[CategoryType::NumberOfCategories] = {}; |
| |
| for (const auto *I : Attrs) { |
| const LoopHintAttr *LH = dyn_cast<LoopHintAttr>(I); |
| |
| // Skip non loop hint attributes |
| if (!LH) |
| continue; |
| |
| CategoryType Category = CategoryType::NumberOfCategories; |
| LoopHintAttr::OptionType Option = LH->getOption(); |
| switch (Option) { |
| case LoopHintAttr::Vectorize: |
| case LoopHintAttr::VectorizeWidth: |
| Category = Vectorize; |
| break; |
| case LoopHintAttr::Interleave: |
| case LoopHintAttr::InterleaveCount: |
| Category = Interleave; |
| break; |
| case LoopHintAttr::Unroll: |
| case LoopHintAttr::UnrollCount: |
| Category = Unroll; |
| break; |
| case LoopHintAttr::UnrollAndJam: |
| case LoopHintAttr::UnrollAndJamCount: |
| Category = UnrollAndJam; |
| break; |
| case LoopHintAttr::Distribute: |
| // Perform the check for duplicated 'distribute' hints. |
| Category = Distribute; |
| break; |
| case LoopHintAttr::PipelineDisabled: |
| case LoopHintAttr::PipelineInitiationInterval: |
| Category = Pipeline; |
| break; |
| case LoopHintAttr::VectorizePredicate: |
| Category = VectorizePredicate; |
| break; |
| }; |
| |
| assert(Category != NumberOfCategories && "Unhandled loop hint option"); |
| auto &CategoryState = HintAttrs[Category]; |
| const LoopHintAttr *PrevAttr; |
| if (Option == LoopHintAttr::Vectorize || |
| Option == LoopHintAttr::Interleave || Option == LoopHintAttr::Unroll || |
| Option == LoopHintAttr::UnrollAndJam || |
| Option == LoopHintAttr::VectorizePredicate || |
| Option == LoopHintAttr::PipelineDisabled || |
| Option == LoopHintAttr::Distribute) { |
| // Enable|Disable|AssumeSafety hint. For example, vectorize(enable). |
| PrevAttr = CategoryState.StateAttr; |
| CategoryState.StateAttr = LH; |
| } else { |
| // Numeric hint. For example, vectorize_width(8). |
| PrevAttr = CategoryState.NumericAttr; |
| CategoryState.NumericAttr = LH; |
| } |
| |
| PrintingPolicy Policy(S.Context.getLangOpts()); |
| SourceLocation OptionLoc = LH->getRange().getBegin(); |
| if (PrevAttr) |
| // Cannot specify same type of attribute twice. |
| S.Diag(OptionLoc, diag::err_pragma_loop_compatibility) |
| << /*Duplicate=*/true << PrevAttr->getDiagnosticName(Policy) |
| << LH->getDiagnosticName(Policy); |
| |
| if (CategoryState.StateAttr && CategoryState.NumericAttr && |
| (Category == Unroll || Category == UnrollAndJam || |
| CategoryState.StateAttr->getState() == LoopHintAttr::Disable)) { |
| // Disable hints are not compatible with numeric hints of the same |
| // category. As a special case, numeric unroll hints are also not |
| // compatible with enable or full form of the unroll pragma because these |
| // directives indicate full unrolling. |
| S.Diag(OptionLoc, diag::err_pragma_loop_compatibility) |
| << /*Duplicate=*/false |
| << CategoryState.StateAttr->getDiagnosticName(Policy) |
| << CategoryState.NumericAttr->getDiagnosticName(Policy); |
| } |
| } |
| } |
| |
| static Attr *handleOpenCLUnrollHint(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| // Although the feature was introduced only in OpenCL C v2.0 s6.11.5, it's |
| // useful for OpenCL 1.x too and doesn't require HW support. |
| // opencl_unroll_hint can have 0 arguments (compiler |
| // determines unrolling factor) or 1 argument (the unroll factor provided |
| // by the user). |
| unsigned UnrollFactor = 0; |
| if (A.getNumArgs() == 1) { |
| Expr *E = A.getArgAsExpr(0); |
| std::optional<llvm::APSInt> ArgVal; |
| |
| if (!(ArgVal = E->getIntegerConstantExpr(S.Context))) { |
| S.Diag(A.getLoc(), diag::err_attribute_argument_type) |
| << A << AANT_ArgumentIntegerConstant << E->getSourceRange(); |
| return nullptr; |
| } |
| |
| int Val = ArgVal->getSExtValue(); |
| if (Val <= 0) { |
| S.Diag(A.getRange().getBegin(), |
| diag::err_attribute_requires_positive_integer) |
| << A << /* positive */ 0; |
| return nullptr; |
| } |
| UnrollFactor = static_cast<unsigned>(Val); |
| } |
| |
| return ::new (S.Context) OpenCLUnrollHintAttr(S.Context, A, UnrollFactor); |
| } |
| |
| static Attr *handleHLSLLoopHintAttr(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| |
| if (A.getSemanticSpelling() == HLSLLoopHintAttr::Spelling::Microsoft_loop && |
| !A.checkAtMostNumArgs(S, 0)) |
| return nullptr; |
| |
| unsigned UnrollFactor = 0; |
| if (A.getNumArgs() == 1) { |
| Expr *E = A.getArgAsExpr(0); |
| |
| if (S.CheckLoopHintExpr(E, St->getBeginLoc(), |
| /*AllowZero=*/false)) |
| return nullptr; |
| |
| std::optional<llvm::APSInt> ArgVal = E->getIntegerConstantExpr(S.Context); |
| // CheckLoopHintExpr handles non int const cases |
| assert(ArgVal != std::nullopt && "ArgVal should be an integer constant."); |
| int Val = ArgVal->getSExtValue(); |
| // CheckLoopHintExpr handles negative and zero cases |
| assert(Val > 0 && "Val should be a positive integer greater than zero."); |
| UnrollFactor = static_cast<unsigned>(Val); |
| } |
| return ::new (S.Context) HLSLLoopHintAttr(S.Context, A, UnrollFactor); |
| } |
| |
| static Attr *handleHLSLControlFlowHint(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| |
| return ::new (S.Context) HLSLControlFlowHintAttr(S.Context, A); |
| } |
| |
| static Attr *ProcessStmtAttribute(Sema &S, Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| if (A.isInvalid() || A.getKind() == ParsedAttr::IgnoredAttribute) |
| return nullptr; |
| |
| // Unknown attributes are automatically warned on. Target-specific attributes |
| // which do not apply to the current target architecture are treated as |
| // though they were unknown attributes. |
| const TargetInfo *Aux = S.Context.getAuxTargetInfo(); |
| if (A.getKind() == ParsedAttr::UnknownAttribute || |
| !(A.existsInTarget(S.Context.getTargetInfo()) || |
| (S.Context.getLangOpts().SYCLIsDevice && Aux && |
| A.existsInTarget(*Aux)))) { |
| S.Diag(A.getLoc(), A.isRegularKeywordAttribute() |
| ? (unsigned)diag::err_keyword_not_supported_on_target |
| : A.isDeclspecAttribute() |
| ? (unsigned)diag::warn_unhandled_ms_attribute_ignored |
| : (unsigned)diag::warn_unknown_attribute_ignored) |
| << A << A.getRange(); |
| return nullptr; |
| } |
| |
| if (S.checkCommonAttributeFeatures(St, A)) |
| return nullptr; |
| |
| switch (A.getKind()) { |
| case ParsedAttr::AT_AlwaysInline: |
| return handleAlwaysInlineAttr(S, St, A, Range); |
| case ParsedAttr::AT_CXXAssume: |
| return handleCXXAssumeAttr(S, St, A, Range); |
| case ParsedAttr::AT_FallThrough: |
| return handleFallThroughAttr(S, St, A, Range); |
| case ParsedAttr::AT_LoopHint: |
| return handleLoopHintAttr(S, St, A, Range); |
| case ParsedAttr::AT_HLSLLoopHint: |
| return handleHLSLLoopHintAttr(S, St, A, Range); |
| case ParsedAttr::AT_HLSLControlFlowHint: |
| return handleHLSLControlFlowHint(S, St, A, Range); |
| case ParsedAttr::AT_OpenCLUnrollHint: |
| return handleOpenCLUnrollHint(S, St, A, Range); |
| case ParsedAttr::AT_Suppress: |
| return handleSuppressAttr(S, St, A, Range); |
| case ParsedAttr::AT_NoMerge: |
| return handleNoMergeAttr(S, St, A, Range); |
| case ParsedAttr::AT_NoInline: |
| return handleNoInlineAttr(S, St, A, Range); |
| case ParsedAttr::AT_MustTail: |
| return handleMustTailAttr(S, St, A, Range); |
| case ParsedAttr::AT_Likely: |
| return handleLikely(S, St, A, Range); |
| case ParsedAttr::AT_Unlikely: |
| return handleUnlikely(S, St, A, Range); |
| case ParsedAttr::AT_CodeAlign: |
| return handleCodeAlignAttr(S, St, A); |
| case ParsedAttr::AT_MSConstexpr: |
| return handleMSConstexprAttr(S, St, A, Range); |
| case ParsedAttr::AT_NoConvergent: |
| return handleNoConvergentAttr(S, St, A, Range); |
| case ParsedAttr::AT_Annotate: |
| return S.CreateAnnotationAttr(A); |
| default: |
| if (Attr *AT = nullptr; A.getInfo().handleStmtAttribute(S, St, A, AT) != |
| ParsedAttrInfo::NotHandled) { |
| return AT; |
| } |
| // N.B., ClangAttrEmitter.cpp emits a diagnostic helper that ensures a |
| // declaration attribute is not written on a statement, but this code is |
| // needed for attributes in Attr.td that do not list any subjects. |
| S.Diag(A.getRange().getBegin(), diag::err_decl_attribute_invalid_on_stmt) |
| << A << A.isRegularKeywordAttribute() << St->getBeginLoc(); |
| return nullptr; |
| } |
| } |
| |
| void Sema::ProcessStmtAttributes(Stmt *S, const ParsedAttributes &InAttrs, |
| SmallVectorImpl<const Attr *> &OutAttrs) { |
| for (const ParsedAttr &AL : InAttrs) { |
| if (const Attr *A = ProcessStmtAttribute(*this, S, AL, InAttrs.Range)) |
| OutAttrs.push_back(A); |
| } |
| |
| CheckForIncompatibleAttributes(*this, OutAttrs); |
| CheckForDuplicateLoopAttrs<CodeAlignAttr>(*this, OutAttrs); |
| } |
| |
| bool Sema::CheckRebuiltStmtAttributes(ArrayRef<const Attr *> Attrs) { |
| CheckForDuplicateLoopAttrs<CodeAlignAttr>(*this, Attrs); |
| return false; |
| } |
| |
| ExprResult Sema::ActOnCXXAssumeAttr(Stmt *St, const ParsedAttr &A, |
| SourceRange Range) { |
| if (A.getNumArgs() != 1 || !A.getArgAsExpr(0)) { |
| Diag(A.getLoc(), diag::err_attribute_wrong_number_arguments) |
| << A.getAttrName() << 1 << Range; |
| return ExprError(); |
| } |
| |
| auto *Assumption = A.getArgAsExpr(0); |
| |
| if (DiagnoseUnexpandedParameterPack(Assumption)) { |
| return ExprError(); |
| } |
| |
| if (Assumption->getDependence() == ExprDependence::None) { |
| ExprResult Res = BuildCXXAssumeExpr(Assumption, A.getAttrName(), Range); |
| if (Res.isInvalid()) |
| return ExprError(); |
| Assumption = Res.get(); |
| } |
| |
| if (!getLangOpts().CPlusPlus23 && |
| A.getSyntax() == AttributeCommonInfo::AS_CXX11) |
| Diag(A.getLoc(), diag::ext_cxx23_attr) << A << Range; |
| |
| return Assumption; |
| } |
| |
| ExprResult Sema::BuildCXXAssumeExpr(Expr *Assumption, |
| const IdentifierInfo *AttrName, |
| SourceRange Range) { |
| ExprResult Res = CorrectDelayedTyposInExpr(Assumption); |
| if (Res.isInvalid()) |
| return ExprError(); |
| |
| Res = CheckPlaceholderExpr(Res.get()); |
| if (Res.isInvalid()) |
| return ExprError(); |
| |
| Res = PerformContextuallyConvertToBool(Res.get()); |
| if (Res.isInvalid()) |
| return ExprError(); |
| |
| Assumption = Res.get(); |
| if (Assumption->HasSideEffects(Context)) |
| Diag(Assumption->getBeginLoc(), diag::warn_assume_side_effects) |
| << AttrName << Range; |
| |
| return Assumption; |
| } |
