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llvm-project/clang/lib/Sema/SemaAttr.cpp
Steffen Larsen ead1690d31 Allow parameter pack expansions and initializer lists in annotate attribute 
These changes make the Clang parser recognize expression parameter pack
expansion and initializer lists in attribute arguments. Because
expression parameter pack expansion requires additional handling while
creating and instantiating templates, the support for them must be
explicitly supported through the AcceptsExprPack flag.

Handling expression pack expansions may require a delay to when the
arguments of an attribute are correctly populated. To this end,
attributes that are set to accept these - through setting the
AcceptsExprPack flag - will automatically have an additional variadic
expression argument member named DelayedArgs. This member is not
exposed the same way other arguments are but is set through the new
CreateWithDelayedArgs creator function generated for applicable
attributes.

To illustrate how to implement support for expression pack expansion
support, clang::annotate is made to support pack expansions. This is
done by making handleAnnotationAttr delay setting the actual attribute
arguments until after template instantiation if it was unable to
populate the arguments due to dependencies in the parsed expressions.
2022-02-08 13:38:07 -05:00

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//===--- SemaAttr.cpp - Semantic Analysis for Attributes ------------------===//
//
// 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 semantic analysis for non-trivial attributes and
// pragmas.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Expr.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/SemaInternal.h"
using namespace clang;
//===----------------------------------------------------------------------===//
// Pragma 'pack' and 'options align'
//===----------------------------------------------------------------------===//
Sema::PragmaStackSentinelRAII::PragmaStackSentinelRAII(Sema &S,
StringRef SlotLabel,
bool ShouldAct)
: S(S), SlotLabel(SlotLabel), ShouldAct(ShouldAct) {
if (ShouldAct) {
S.VtorDispStack.SentinelAction(PSK_Push, SlotLabel);
S.DataSegStack.SentinelAction(PSK_Push, SlotLabel);
S.BSSSegStack.SentinelAction(PSK_Push, SlotLabel);
S.ConstSegStack.SentinelAction(PSK_Push, SlotLabel);
S.CodeSegStack.SentinelAction(PSK_Push, SlotLabel);
}
}
Sema::PragmaStackSentinelRAII::~PragmaStackSentinelRAII() {
if (ShouldAct) {
S.VtorDispStack.SentinelAction(PSK_Pop, SlotLabel);
S.DataSegStack.SentinelAction(PSK_Pop, SlotLabel);
S.BSSSegStack.SentinelAction(PSK_Pop, SlotLabel);
S.ConstSegStack.SentinelAction(PSK_Pop, SlotLabel);
S.CodeSegStack.SentinelAction(PSK_Pop, SlotLabel);
}
}
void Sema::AddAlignmentAttributesForRecord(RecordDecl *RD) {
AlignPackInfo InfoVal = AlignPackStack.CurrentValue;
AlignPackInfo::Mode M = InfoVal.getAlignMode();
bool IsPackSet = InfoVal.IsPackSet();
bool IsXLPragma = getLangOpts().XLPragmaPack;
// If we are not under mac68k/natural alignment mode and also there is no pack
// value, we don't need any attributes.
if (!IsPackSet && M != AlignPackInfo::Mac68k && M != AlignPackInfo::Natural)
return;
if (M == AlignPackInfo::Mac68k && (IsXLPragma || InfoVal.IsAlignAttr())) {
RD->addAttr(AlignMac68kAttr::CreateImplicit(Context));
} else if (IsPackSet) {
// Check to see if we need a max field alignment attribute.
RD->addAttr(MaxFieldAlignmentAttr::CreateImplicit(
Context, InfoVal.getPackNumber() * 8));
}
if (IsXLPragma && M == AlignPackInfo::Natural)
RD->addAttr(AlignNaturalAttr::CreateImplicit(Context));
if (AlignPackIncludeStack.empty())
return;
// The #pragma align/pack affected a record in an included file, so Clang
// should warn when that pragma was written in a file that included the
// included file.
for (auto &AlignPackedInclude : llvm::reverse(AlignPackIncludeStack)) {
if (AlignPackedInclude.CurrentPragmaLocation !=
AlignPackStack.CurrentPragmaLocation)
break;
if (AlignPackedInclude.HasNonDefaultValue)
AlignPackedInclude.ShouldWarnOnInclude = true;
}
}
void Sema::AddMsStructLayoutForRecord(RecordDecl *RD) {
if (MSStructPragmaOn)
RD->addAttr(MSStructAttr::CreateImplicit(Context));
// FIXME: We should merge AddAlignmentAttributesForRecord with
// AddMsStructLayoutForRecord into AddPragmaAttributesForRecord, which takes
// all active pragmas and applies them as attributes to class definitions.
if (VtorDispStack.CurrentValue != getLangOpts().getVtorDispMode())
RD->addAttr(MSVtorDispAttr::CreateImplicit(
Context, unsigned(VtorDispStack.CurrentValue)));
}
template <typename Attribute>
static void addGslOwnerPointerAttributeIfNotExisting(ASTContext &Context,
CXXRecordDecl *Record) {
if (Record->hasAttr<OwnerAttr>() || Record->hasAttr<PointerAttr>())
return;
for (Decl *Redecl : Record->redecls())
Redecl->addAttr(Attribute::CreateImplicit(Context, /*DerefType=*/nullptr));
}
void Sema::inferGslPointerAttribute(NamedDecl *ND,
CXXRecordDecl *UnderlyingRecord) {
if (!UnderlyingRecord)
return;
const auto *Parent = dyn_cast<CXXRecordDecl>(ND->getDeclContext());
if (!Parent)
return;
static llvm::StringSet<> Containers{
"array",
"basic_string",
"deque",
"forward_list",
"vector",
"list",
"map",
"multiset",
"multimap",
"priority_queue",
"queue",
"set",
"stack",
"unordered_set",
"unordered_map",
"unordered_multiset",
"unordered_multimap",
};
static llvm::StringSet<> Iterators{"iterator", "const_iterator",
"reverse_iterator",
"const_reverse_iterator"};
if (Parent->isInStdNamespace() && Iterators.count(ND->getName()) &&
Containers.count(Parent->getName()))
addGslOwnerPointerAttributeIfNotExisting<PointerAttr>(Context,
UnderlyingRecord);
}
void Sema::inferGslPointerAttribute(TypedefNameDecl *TD) {
QualType Canonical = TD->getUnderlyingType().getCanonicalType();
CXXRecordDecl *RD = Canonical->getAsCXXRecordDecl();
if (!RD) {
if (auto *TST =
dyn_cast<TemplateSpecializationType>(Canonical.getTypePtr())) {
RD = dyn_cast_or_null<CXXRecordDecl>(
TST->getTemplateName().getAsTemplateDecl()->getTemplatedDecl());
}
}
inferGslPointerAttribute(TD, RD);
}
void Sema::inferGslOwnerPointerAttribute(CXXRecordDecl *Record) {
static llvm::StringSet<> StdOwners{
"any",
"array",
"basic_regex",
"basic_string",
"deque",
"forward_list",
"vector",
"list",
"map",
"multiset",
"multimap",
"optional",
"priority_queue",
"queue",
"set",
"stack",
"unique_ptr",
"unordered_set",
"unordered_map",
"unordered_multiset",
"unordered_multimap",
"variant",
};
static llvm::StringSet<> StdPointers{
"basic_string_view",
"reference_wrapper",
"regex_iterator",
};
if (!Record->getIdentifier())
return;
// Handle classes that directly appear in std namespace.
if (Record->isInStdNamespace()) {
if (Record->hasAttr<OwnerAttr>() || Record->hasAttr<PointerAttr>())
return;
if (StdOwners.count(Record->getName()))
addGslOwnerPointerAttributeIfNotExisting<OwnerAttr>(Context, Record);
else if (StdPointers.count(Record->getName()))
addGslOwnerPointerAttributeIfNotExisting<PointerAttr>(Context, Record);
return;
}
// Handle nested classes that could be a gsl::Pointer.
inferGslPointerAttribute(Record, Record);
}
void Sema::ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
SourceLocation PragmaLoc) {
PragmaMsStackAction Action = Sema::PSK_Reset;
AlignPackInfo::Mode ModeVal = AlignPackInfo::Native;
switch (Kind) {
// For most of the platforms we support, native and natural are the same.
// With XL, native is the same as power, natural means something else.
//
// FIXME: This is not true on Darwin/PPC.
case POAK_Native:
case POAK_Power:
Action = Sema::PSK_Push_Set;
break;
case POAK_Natural:
Action = Sema::PSK_Push_Set;
ModeVal = AlignPackInfo::Natural;
break;
// Note that '#pragma options align=packed' is not equivalent to attribute
// packed, it has a different precedence relative to attribute aligned.
case POAK_Packed:
Action = Sema::PSK_Push_Set;
ModeVal = AlignPackInfo::Packed;
break;
case POAK_Mac68k:
// Check if the target supports this.
if (!this->Context.getTargetInfo().hasAlignMac68kSupport()) {
Diag(PragmaLoc, diag::err_pragma_options_align_mac68k_target_unsupported);
return;
}
Action = Sema::PSK_Push_Set;
ModeVal = AlignPackInfo::Mac68k;
break;
case POAK_Reset:
// Reset just pops the top of the stack, or resets the current alignment to
// default.
Action = Sema::PSK_Pop;
if (AlignPackStack.Stack.empty()) {
if (AlignPackStack.CurrentValue.getAlignMode() != AlignPackInfo::Native ||
AlignPackStack.CurrentValue.IsPackAttr()) {
Action = Sema::PSK_Reset;
} else {
Diag(PragmaLoc, diag::warn_pragma_options_align_reset_failed)
<< "stack empty";
return;
}
}
break;
}
AlignPackInfo Info(ModeVal, getLangOpts().XLPragmaPack);
AlignPackStack.Act(PragmaLoc, Action, StringRef(), Info);
}
void Sema::ActOnPragmaClangSection(SourceLocation PragmaLoc,
PragmaClangSectionAction Action,
PragmaClangSectionKind SecKind,
StringRef SecName) {
PragmaClangSection *CSec;
int SectionFlags = ASTContext::PSF_Read;
switch (SecKind) {
case PragmaClangSectionKind::PCSK_BSS:
CSec = &PragmaClangBSSSection;
SectionFlags |= ASTContext::PSF_Write | ASTContext::PSF_ZeroInit;
break;
case PragmaClangSectionKind::PCSK_Data:
CSec = &PragmaClangDataSection;
SectionFlags |= ASTContext::PSF_Write;
break;
case PragmaClangSectionKind::PCSK_Rodata:
CSec = &PragmaClangRodataSection;
break;
case PragmaClangSectionKind::PCSK_Relro:
CSec = &PragmaClangRelroSection;
break;
case PragmaClangSectionKind::PCSK_Text:
CSec = &PragmaClangTextSection;
SectionFlags |= ASTContext::PSF_Execute;
break;
default:
llvm_unreachable("invalid clang section kind");
}
if (Action == PragmaClangSectionAction::PCSA_Clear) {
CSec->Valid = false;
return;
}
if (llvm::Error E = isValidSectionSpecifier(SecName)) {
Diag(PragmaLoc, diag::err_pragma_section_invalid_for_target)
<< toString(std::move(E));
CSec->Valid = false;
return;
}
if (UnifySection(SecName, SectionFlags, PragmaLoc))
return;
CSec->Valid = true;
CSec->SectionName = std::string(SecName);
CSec->PragmaLocation = PragmaLoc;
}
void Sema::ActOnPragmaPack(SourceLocation PragmaLoc, PragmaMsStackAction Action,
StringRef SlotLabel, Expr *alignment) {
bool IsXLPragma = getLangOpts().XLPragmaPack;
// XL pragma pack does not support identifier syntax.
if (IsXLPragma && !SlotLabel.empty()) {
Diag(PragmaLoc, diag::err_pragma_pack_identifer_not_supported);
return;
}
const AlignPackInfo CurVal = AlignPackStack.CurrentValue;
Expr *Alignment = static_cast<Expr *>(alignment);
// If specified then alignment must be a "small" power of two.
unsigned AlignmentVal = 0;
AlignPackInfo::Mode ModeVal = CurVal.getAlignMode();
if (Alignment) {
Optional<llvm::APSInt> Val;
Val = Alignment->getIntegerConstantExpr(Context);
// pack(0) is like pack(), which just works out since that is what
// we use 0 for in PackAttr.
if (Alignment->isTypeDependent() || !Val ||
!(*Val == 0 || Val->isPowerOf2()) || Val->getZExtValue() > 16) {
Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment);
return; // Ignore
}
if (IsXLPragma && *Val == 0) {
// pack(0) does not work out with XL.
Diag(PragmaLoc, diag::err_pragma_pack_invalid_alignment);
return; // Ignore
}
AlignmentVal = (unsigned)Val->getZExtValue();
}
if (Action == Sema::PSK_Show) {
// Show the current alignment, making sure to show the right value
// for the default.
// FIXME: This should come from the target.
AlignmentVal = CurVal.IsPackSet() ? CurVal.getPackNumber() : 8;
if (ModeVal == AlignPackInfo::Mac68k &&
(IsXLPragma || CurVal.IsAlignAttr()))
Diag(PragmaLoc, diag::warn_pragma_pack_show) << "mac68k";
else
Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal;
}
// MSDN, C/C++ Preprocessor Reference > Pragma Directives > pack:
// "#pragma pack(pop, identifier, n) is undefined"
if (Action & Sema::PSK_Pop) {
if (Alignment && !SlotLabel.empty())
Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifier_and_alignment);
if (AlignPackStack.Stack.empty()) {
assert(CurVal.getAlignMode() == AlignPackInfo::Native &&
"Empty pack stack can only be at Native alignment mode.");
Diag(PragmaLoc, diag::warn_pragma_pop_failed) << "pack" << "stack empty";
}
}
AlignPackInfo Info(ModeVal, AlignmentVal, IsXLPragma);
AlignPackStack.Act(PragmaLoc, Action, SlotLabel, Info);
}
void Sema::DiagnoseNonDefaultPragmaAlignPack(PragmaAlignPackDiagnoseKind Kind,
SourceLocation IncludeLoc) {
if (Kind == PragmaAlignPackDiagnoseKind::NonDefaultStateAtInclude) {
SourceLocation PrevLocation = AlignPackStack.CurrentPragmaLocation;
// Warn about non-default alignment at #includes (without redundant
// warnings for the same directive in nested includes).
// The warning is delayed until the end of the file to avoid warnings
// for files that don't have any records that are affected by the modified
// alignment.
bool HasNonDefaultValue =
AlignPackStack.hasValue() &&
(AlignPackIncludeStack.empty() ||
AlignPackIncludeStack.back().CurrentPragmaLocation != PrevLocation);
AlignPackIncludeStack.push_back(
{AlignPackStack.CurrentValue,
AlignPackStack.hasValue() ? PrevLocation : SourceLocation(),
HasNonDefaultValue, /*ShouldWarnOnInclude*/ false});
return;
}
assert(Kind == PragmaAlignPackDiagnoseKind::ChangedStateAtExit &&
"invalid kind");
AlignPackIncludeState PrevAlignPackState =
AlignPackIncludeStack.pop_back_val();
// FIXME: AlignPackStack may contain both #pragma align and #pragma pack
// information, diagnostics below might not be accurate if we have mixed
// pragmas.
if (PrevAlignPackState.ShouldWarnOnInclude) {
// Emit the delayed non-default alignment at #include warning.
Diag(IncludeLoc, diag::warn_pragma_pack_non_default_at_include);
Diag(PrevAlignPackState.CurrentPragmaLocation, diag::note_pragma_pack_here);
}
// Warn about modified alignment after #includes.
if (PrevAlignPackState.CurrentValue != AlignPackStack.CurrentValue) {
Diag(IncludeLoc, diag::warn_pragma_pack_modified_after_include);
Diag(AlignPackStack.CurrentPragmaLocation, diag::note_pragma_pack_here);
}
}
void Sema::DiagnoseUnterminatedPragmaAlignPack() {
if (AlignPackStack.Stack.empty())
return;
bool IsInnermost = true;
// FIXME: AlignPackStack may contain both #pragma align and #pragma pack
// information, diagnostics below might not be accurate if we have mixed
// pragmas.
for (const auto &StackSlot : llvm::reverse(AlignPackStack.Stack)) {
Diag(StackSlot.PragmaPushLocation, diag::warn_pragma_pack_no_pop_eof);
// The user might have already reset the alignment, so suggest replacing
// the reset with a pop.
if (IsInnermost &&
AlignPackStack.CurrentValue == AlignPackStack.DefaultValue) {
auto DB = Diag(AlignPackStack.CurrentPragmaLocation,
diag::note_pragma_pack_pop_instead_reset);
SourceLocation FixItLoc =
Lexer::findLocationAfterToken(AlignPackStack.CurrentPragmaLocation,
tok::l_paren, SourceMgr, LangOpts,
/*SkipTrailing=*/false);
if (FixItLoc.isValid())
DB << FixItHint::CreateInsertion(FixItLoc, "pop");
}
IsInnermost = false;
}
}
void Sema::ActOnPragmaMSStruct(PragmaMSStructKind Kind) {
MSStructPragmaOn = (Kind == PMSST_ON);
}
void Sema::ActOnPragmaMSComment(SourceLocation CommentLoc,
PragmaMSCommentKind Kind, StringRef Arg) {
auto *PCD = PragmaCommentDecl::Create(
Context, Context.getTranslationUnitDecl(), CommentLoc, Kind, Arg);
Context.getTranslationUnitDecl()->addDecl(PCD);
Consumer.HandleTopLevelDecl(DeclGroupRef(PCD));
}
void Sema::ActOnPragmaDetectMismatch(SourceLocation Loc, StringRef Name,
StringRef Value) {
auto *PDMD = PragmaDetectMismatchDecl::Create(
Context, Context.getTranslationUnitDecl(), Loc, Name, Value);
Context.getTranslationUnitDecl()->addDecl(PDMD);
Consumer.HandleTopLevelDecl(DeclGroupRef(PDMD));
}
void Sema::ActOnPragmaFloatControl(SourceLocation Loc,
PragmaMsStackAction Action,
PragmaFloatControlKind Value) {
FPOptionsOverride NewFPFeatures = CurFPFeatureOverrides();
if ((Action == PSK_Push_Set || Action == PSK_Push || Action == PSK_Pop) &&
!CurContext->getRedeclContext()->isFileContext()) {
// Push and pop can only occur at file or namespace scope, or within a
// language linkage declaration.
Diag(Loc, diag::err_pragma_fc_pp_scope);
return;
}
switch (Value) {
default:
llvm_unreachable("invalid pragma float_control kind");
case PFC_Precise:
NewFPFeatures.setFPPreciseEnabled(true);
FpPragmaStack.Act(Loc, Action, StringRef(), NewFPFeatures);
break;
case PFC_NoPrecise:
if (CurFPFeatures.getFPExceptionMode() == LangOptions::FPE_Strict)
Diag(Loc, diag::err_pragma_fc_noprecise_requires_noexcept);
else if (CurFPFeatures.getAllowFEnvAccess())
Diag(Loc, diag::err_pragma_fc_noprecise_requires_nofenv);
else
NewFPFeatures.setFPPreciseEnabled(false);
FpPragmaStack.Act(Loc, Action, StringRef(), NewFPFeatures);
break;
case PFC_Except:
if (!isPreciseFPEnabled())
Diag(Loc, diag::err_pragma_fc_except_requires_precise);
else
NewFPFeatures.setFPExceptionModeOverride(LangOptions::FPE_Strict);
FpPragmaStack.Act(Loc, Action, StringRef(), NewFPFeatures);
break;
case PFC_NoExcept:
NewFPFeatures.setFPExceptionModeOverride(LangOptions::FPE_Ignore);
FpPragmaStack.Act(Loc, Action, StringRef(), NewFPFeatures);
break;
case PFC_Push:
FpPragmaStack.Act(Loc, Sema::PSK_Push_Set, StringRef(), NewFPFeatures);
break;
case PFC_Pop:
if (FpPragmaStack.Stack.empty()) {
Diag(Loc, diag::warn_pragma_pop_failed) << "float_control"
<< "stack empty";
return;
}
FpPragmaStack.Act(Loc, Action, StringRef(), NewFPFeatures);
NewFPFeatures = FpPragmaStack.CurrentValue;
break;
}
CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
}
void Sema::ActOnPragmaMSPointersToMembers(
LangOptions::PragmaMSPointersToMembersKind RepresentationMethod,
SourceLocation PragmaLoc) {
MSPointerToMemberRepresentationMethod = RepresentationMethod;
ImplicitMSInheritanceAttrLoc = PragmaLoc;
}
void Sema::ActOnPragmaMSVtorDisp(PragmaMsStackAction Action,
SourceLocation PragmaLoc,
MSVtorDispMode Mode) {
if (Action & PSK_Pop && VtorDispStack.Stack.empty())
Diag(PragmaLoc, diag::warn_pragma_pop_failed) << "vtordisp"
<< "stack empty";
VtorDispStack.Act(PragmaLoc, Action, StringRef(), Mode);
}
template <>
void Sema::PragmaStack<Sema::AlignPackInfo>::Act(SourceLocation PragmaLocation,
PragmaMsStackAction Action,
llvm::StringRef StackSlotLabel,
AlignPackInfo Value) {
if (Action == PSK_Reset) {
CurrentValue = DefaultValue;
CurrentPragmaLocation = PragmaLocation;
return;
}
if (Action & PSK_Push)
Stack.emplace_back(Slot(StackSlotLabel, CurrentValue, CurrentPragmaLocation,
PragmaLocation));
else if (Action & PSK_Pop) {
if (!StackSlotLabel.empty()) {
// If we've got a label, try to find it and jump there.
auto I = llvm::find_if(llvm::reverse(Stack), [&](const Slot &x) {
return x.StackSlotLabel == StackSlotLabel;
});
// We found the label, so pop from there.
if (I != Stack.rend()) {
CurrentValue = I->Value;
CurrentPragmaLocation = I->PragmaLocation;
Stack.erase(std::prev(I.base()), Stack.end());
}
} else if (Value.IsXLStack() && Value.IsAlignAttr() &&
CurrentValue.IsPackAttr()) {
// XL '#pragma align(reset)' would pop the stack until
// a current in effect pragma align is popped.
auto I = llvm::find_if(llvm::reverse(Stack), [&](const Slot &x) {
return x.Value.IsAlignAttr();
});
// If we found pragma align so pop from there.
if (I != Stack.rend()) {
Stack.erase(std::prev(I.base()), Stack.end());
if (Stack.empty()) {
CurrentValue = DefaultValue;
CurrentPragmaLocation = PragmaLocation;
} else {
CurrentValue = Stack.back().Value;
CurrentPragmaLocation = Stack.back().PragmaLocation;
Stack.pop_back();
}
}
} else if (!Stack.empty()) {
// xl '#pragma align' sets the baseline, and `#pragma pack` cannot pop
// over the baseline.
if (Value.IsXLStack() && Value.IsPackAttr() && CurrentValue.IsAlignAttr())
return;
// We don't have a label, just pop the last entry.
CurrentValue = Stack.back().Value;
CurrentPragmaLocation = Stack.back().PragmaLocation;
Stack.pop_back();
}
}
if (Action & PSK_Set) {
CurrentValue = Value;
CurrentPragmaLocation = PragmaLocation;
}
}
bool Sema::UnifySection(StringRef SectionName, int SectionFlags,
NamedDecl *Decl) {
SourceLocation PragmaLocation;
if (auto A = Decl->getAttr<SectionAttr>())
if (A->isImplicit())
PragmaLocation = A->getLocation();
auto SectionIt = Context.SectionInfos.find(SectionName);
if (SectionIt == Context.SectionInfos.end()) {
Context.SectionInfos[SectionName] =
ASTContext::SectionInfo(Decl, PragmaLocation, SectionFlags);
return false;
}
// A pre-declared section takes precedence w/o diagnostic.
const auto &Section = SectionIt->second;
if (Section.SectionFlags == SectionFlags ||
((SectionFlags & ASTContext::PSF_Implicit) &&
!(Section.SectionFlags & ASTContext::PSF_Implicit)))
return false;
Diag(Decl->getLocation(), diag::err_section_conflict) << Decl << Section;
if (Section.Decl)
Diag(Section.Decl->getLocation(), diag::note_declared_at)
<< Section.Decl->getName();
if (PragmaLocation.isValid())
Diag(PragmaLocation, diag::note_pragma_entered_here);
if (Section.PragmaSectionLocation.isValid())
Diag(Section.PragmaSectionLocation, diag::note_pragma_entered_here);
return true;
}
bool Sema::UnifySection(StringRef SectionName,
int SectionFlags,
SourceLocation PragmaSectionLocation) {
auto SectionIt = Context.SectionInfos.find(SectionName);
if (SectionIt != Context.SectionInfos.end()) {
const auto &Section = SectionIt->second;
if (Section.SectionFlags == SectionFlags)
return false;
if (!(Section.SectionFlags & ASTContext::PSF_Implicit)) {
Diag(PragmaSectionLocation, diag::err_section_conflict)
<< "this" << Section;
if (Section.Decl)
Diag(Section.Decl->getLocation(), diag::note_declared_at)
<< Section.Decl->getName();
if (Section.PragmaSectionLocation.isValid())
Diag(Section.PragmaSectionLocation, diag::note_pragma_entered_here);
return true;
}
}
Context.SectionInfos[SectionName] =
ASTContext::SectionInfo(nullptr, PragmaSectionLocation, SectionFlags);
return false;
}
/// Called on well formed \#pragma bss_seg().
void Sema::ActOnPragmaMSSeg(SourceLocation PragmaLocation,
PragmaMsStackAction Action,
llvm::StringRef StackSlotLabel,
StringLiteral *SegmentName,
llvm::StringRef PragmaName) {
PragmaStack<StringLiteral *> *Stack =
llvm::StringSwitch<PragmaStack<StringLiteral *> *>(PragmaName)
.Case("data_seg", &DataSegStack)
.Case("bss_seg", &BSSSegStack)
.Case("const_seg", &ConstSegStack)
.Case("code_seg", &CodeSegStack);
if (Action & PSK_Pop && Stack->Stack.empty())
Diag(PragmaLocation, diag::warn_pragma_pop_failed) << PragmaName
<< "stack empty";
if (SegmentName) {
if (!checkSectionName(SegmentName->getBeginLoc(), SegmentName->getString()))
return;
if (SegmentName->getString() == ".drectve" &&
Context.getTargetInfo().getCXXABI().isMicrosoft())
Diag(PragmaLocation, diag::warn_attribute_section_drectve) << PragmaName;
}
Stack->Act(PragmaLocation, Action, StackSlotLabel, SegmentName);
}
/// Called on well formed \#pragma bss_seg().
void Sema::ActOnPragmaMSSection(SourceLocation PragmaLocation,
int SectionFlags, StringLiteral *SegmentName) {
UnifySection(SegmentName->getString(), SectionFlags, PragmaLocation);
}
void Sema::ActOnPragmaMSInitSeg(SourceLocation PragmaLocation,
StringLiteral *SegmentName) {
// There's no stack to maintain, so we just have a current section. When we
// see the default section, reset our current section back to null so we stop
// tacking on unnecessary attributes.
CurInitSeg = SegmentName->getString() == ".CRT$XCU" ? nullptr : SegmentName;
CurInitSegLoc = PragmaLocation;
}
void Sema::ActOnPragmaUnused(const Token &IdTok, Scope *curScope,
SourceLocation PragmaLoc) {
IdentifierInfo *Name = IdTok.getIdentifierInfo();
LookupResult Lookup(*this, Name, IdTok.getLocation(), LookupOrdinaryName);
LookupParsedName(Lookup, curScope, nullptr, true);
if (Lookup.empty()) {
Diag(PragmaLoc, diag::warn_pragma_unused_undeclared_var)
<< Name << SourceRange(IdTok.getLocation());
return;
}
VarDecl *VD = Lookup.getAsSingle<VarDecl>();
if (!VD) {
Diag(PragmaLoc, diag::warn_pragma_unused_expected_var_arg)
<< Name << SourceRange(IdTok.getLocation());
return;
}
// Warn if this was used before being marked unused.
if (VD->isUsed())
Diag(PragmaLoc, diag::warn_used_but_marked_unused) << Name;
VD->addAttr(UnusedAttr::CreateImplicit(Context, IdTok.getLocation(),
AttributeCommonInfo::AS_Pragma,
UnusedAttr::GNU_unused));
}
void Sema::AddCFAuditedAttribute(Decl *D) {
IdentifierInfo *Ident;
SourceLocation Loc;
std::tie(Ident, Loc) = PP.getPragmaARCCFCodeAuditedInfo();
if (!Loc.isValid()) return;
// Don't add a redundant or conflicting attribute.
if (D->hasAttr<CFAuditedTransferAttr>() ||
D->hasAttr<CFUnknownTransferAttr>())
return;
AttributeCommonInfo Info(Ident, SourceRange(Loc),
AttributeCommonInfo::AS_Pragma);
D->addAttr(CFAuditedTransferAttr::CreateImplicit(Context, Info));
}
namespace {
Optional<attr::SubjectMatchRule>
getParentAttrMatcherRule(attr::SubjectMatchRule Rule) {
using namespace attr;
switch (Rule) {
default:
return None;
#define ATTR_MATCH_RULE(Value, Spelling, IsAbstract)
#define ATTR_MATCH_SUB_RULE(Value, Spelling, IsAbstract, Parent, IsNegated) \
case Value: \
return Parent;
#include "clang/Basic/AttrSubMatchRulesList.inc"
}
}
bool isNegatedAttrMatcherSubRule(attr::SubjectMatchRule Rule) {
using namespace attr;
switch (Rule) {
default:
return false;
#define ATTR_MATCH_RULE(Value, Spelling, IsAbstract)
#define ATTR_MATCH_SUB_RULE(Value, Spelling, IsAbstract, Parent, IsNegated) \
case Value: \
return IsNegated;
#include "clang/Basic/AttrSubMatchRulesList.inc"
}
}
CharSourceRange replacementRangeForListElement(const Sema &S,
SourceRange Range) {
// Make sure that the ',' is removed as well.
SourceLocation AfterCommaLoc = Lexer::findLocationAfterToken(
Range.getEnd(), tok::comma, S.getSourceManager(), S.getLangOpts(),
/*SkipTrailingWhitespaceAndNewLine=*/false);
if (AfterCommaLoc.isValid())
return CharSourceRange::getCharRange(Range.getBegin(), AfterCommaLoc);
else
return CharSourceRange::getTokenRange(Range);
}
std::string
attrMatcherRuleListToString(ArrayRef<attr::SubjectMatchRule> Rules) {
std::string Result;
llvm::raw_string_ostream OS(Result);
for (const auto &I : llvm::enumerate(Rules)) {
if (I.index())
OS << (I.index() == Rules.size() - 1 ? ", and " : ", ");
OS << "'" << attr::getSubjectMatchRuleSpelling(I.value()) << "'";
}
return Result;
}
} // end anonymous namespace
void Sema::ActOnPragmaAttributeAttribute(
ParsedAttr &Attribute, SourceLocation PragmaLoc,
attr::ParsedSubjectMatchRuleSet Rules) {
Attribute.setIsPragmaClangAttribute();
SmallVector<attr::SubjectMatchRule, 4> SubjectMatchRules;
// Gather the subject match rules that are supported by the attribute.
SmallVector<std::pair<attr::SubjectMatchRule, bool>, 4>
StrictSubjectMatchRuleSet;
Attribute.getMatchRules(LangOpts, StrictSubjectMatchRuleSet);
// Figure out which subject matching rules are valid.
if (StrictSubjectMatchRuleSet.empty()) {
// Check for contradicting match rules. Contradicting match rules are
// either:
// - a top-level rule and one of its sub-rules. E.g. variable and
// variable(is_parameter).
// - a sub-rule and a sibling that's negated. E.g.
// variable(is_thread_local) and variable(unless(is_parameter))
llvm::SmallDenseMap<int, std::pair<int, SourceRange>, 2>
RulesToFirstSpecifiedNegatedSubRule;
for (const auto &Rule : Rules) {
attr::SubjectMatchRule MatchRule = attr::SubjectMatchRule(Rule.first);
Optional<attr::SubjectMatchRule> ParentRule =
getParentAttrMatcherRule(MatchRule);
if (!ParentRule)
continue;
auto It = Rules.find(*ParentRule);
if (It != Rules.end()) {
// A sub-rule contradicts a parent rule.
Diag(Rule.second.getBegin(),
diag::err_pragma_attribute_matcher_subrule_contradicts_rule)
<< attr::getSubjectMatchRuleSpelling(MatchRule)
<< attr::getSubjectMatchRuleSpelling(*ParentRule) << It->second
<< FixItHint::CreateRemoval(
replacementRangeForListElement(*this, Rule.second));
// Keep going without removing this rule as it won't change the set of
// declarations that receive the attribute.
continue;
}
if (isNegatedAttrMatcherSubRule(MatchRule))
RulesToFirstSpecifiedNegatedSubRule.insert(
std::make_pair(*ParentRule, Rule));
}
bool IgnoreNegatedSubRules = false;
for (const auto &Rule : Rules) {
attr::SubjectMatchRule MatchRule = attr::SubjectMatchRule(Rule.first);
Optional<attr::SubjectMatchRule> ParentRule =
getParentAttrMatcherRule(MatchRule);
if (!ParentRule)
continue;
auto It = RulesToFirstSpecifiedNegatedSubRule.find(*ParentRule);
if (It != RulesToFirstSpecifiedNegatedSubRule.end() &&
It->second != Rule) {
// Negated sub-rule contradicts another sub-rule.
Diag(
It->second.second.getBegin(),
diag::
err_pragma_attribute_matcher_negated_subrule_contradicts_subrule)
<< attr::getSubjectMatchRuleSpelling(
attr::SubjectMatchRule(It->second.first))
<< attr::getSubjectMatchRuleSpelling(MatchRule) << Rule.second
<< FixItHint::CreateRemoval(
replacementRangeForListElement(*this, It->second.second));
// Keep going but ignore all of the negated sub-rules.
IgnoreNegatedSubRules = true;
RulesToFirstSpecifiedNegatedSubRule.erase(It);
}
}
if (!IgnoreNegatedSubRules) {
for (const auto &Rule : Rules)
SubjectMatchRules.push_back(attr::SubjectMatchRule(Rule.first));
} else {
for (const auto &Rule : Rules) {
if (!isNegatedAttrMatcherSubRule(attr::SubjectMatchRule(Rule.first)))
SubjectMatchRules.push_back(attr::SubjectMatchRule(Rule.first));
}
}
Rules.clear();
} else {
// Each rule in Rules must be a strict subset of the attribute's
// SubjectMatch rules. I.e. we're allowed to use
// `apply_to=variables(is_global)` on an attrubute with SubjectList<[Var]>,
// but should not allow `apply_to=variables` on an attribute which has
// `SubjectList<[GlobalVar]>`.
for (const auto &StrictRule : StrictSubjectMatchRuleSet) {
// First, check for exact match.
if (Rules.erase(StrictRule.first)) {
// Add the rule to the set of attribute receivers only if it's supported
// in the current language mode.
if (StrictRule.second)
SubjectMatchRules.push_back(StrictRule.first);
}
}
// Check remaining rules for subset matches.
auto RulesToCheck = Rules;
for (const auto &Rule : RulesToCheck) {
attr::SubjectMatchRule MatchRule = attr::SubjectMatchRule(Rule.first);
if (auto ParentRule = getParentAttrMatcherRule(MatchRule)) {
if (llvm::any_of(StrictSubjectMatchRuleSet,
[ParentRule](const auto &StrictRule) {
return StrictRule.first == *ParentRule &&
StrictRule.second; // IsEnabled
})) {
SubjectMatchRules.push_back(MatchRule);
Rules.erase(MatchRule);
}
}
}
}
if (!Rules.empty()) {
auto Diagnostic =
Diag(PragmaLoc, diag::err_pragma_attribute_invalid_matchers)
<< Attribute;
SmallVector<attr::SubjectMatchRule, 2> ExtraRules;
for (const auto &Rule : Rules) {
ExtraRules.push_back(attr::SubjectMatchRule(Rule.first));
Diagnostic << FixItHint::CreateRemoval(
replacementRangeForListElement(*this, Rule.second));
}
Diagnostic << attrMatcherRuleListToString(ExtraRules);
}
if (PragmaAttributeStack.empty()) {
Diag(PragmaLoc, diag::err_pragma_attr_attr_no_push);
return;
}
PragmaAttributeStack.back().Entries.push_back(
{PragmaLoc, &Attribute, std::move(SubjectMatchRules), /*IsUsed=*/false});
}
void Sema::ActOnPragmaAttributeEmptyPush(SourceLocation PragmaLoc,
const IdentifierInfo *Namespace) {
PragmaAttributeStack.emplace_back();
PragmaAttributeStack.back().Loc = PragmaLoc;
PragmaAttributeStack.back().Namespace = Namespace;
}
void Sema::ActOnPragmaAttributePop(SourceLocation PragmaLoc,
const IdentifierInfo *Namespace) {
if (PragmaAttributeStack.empty()) {
Diag(PragmaLoc, diag::err_pragma_attribute_stack_mismatch) << 1;
return;
}
// Dig back through the stack trying to find the most recently pushed group
// that in Namespace. Note that this works fine if no namespace is present,
// think of push/pops without namespaces as having an implicit "nullptr"
// namespace.
for (size_t Index = PragmaAttributeStack.size(); Index;) {
--Index;
if (PragmaAttributeStack[Index].Namespace == Namespace) {
for (const PragmaAttributeEntry &Entry :
PragmaAttributeStack[Index].Entries) {
if (!Entry.IsUsed) {
assert(Entry.Attribute && "Expected an attribute");
Diag(Entry.Attribute->getLoc(), diag::warn_pragma_attribute_unused)
<< *Entry.Attribute;
Diag(PragmaLoc, diag::note_pragma_attribute_region_ends_here);
}
}
PragmaAttributeStack.erase(PragmaAttributeStack.begin() + Index);
return;
}
}
if (Namespace)
Diag(PragmaLoc, diag::err_pragma_attribute_stack_mismatch)
<< 0 << Namespace->getName();
else
Diag(PragmaLoc, diag::err_pragma_attribute_stack_mismatch) << 1;
}
void Sema::AddPragmaAttributes(Scope *S, Decl *D) {
if (PragmaAttributeStack.empty())
return;
for (auto &Group : PragmaAttributeStack) {
for (auto &Entry : Group.Entries) {
ParsedAttr *Attribute = Entry.Attribute;
assert(Attribute && "Expected an attribute");
assert(Attribute->isPragmaClangAttribute() &&
"expected #pragma clang attribute");
// Ensure that the attribute can be applied to the given declaration.
bool Applies = false;
for (const auto &Rule : Entry.MatchRules) {
if (Attribute->appliesToDecl(D, Rule)) {
Applies = true;
break;
}
}
if (!Applies)
continue;
Entry.IsUsed = true;
PragmaAttributeCurrentTargetDecl = D;
ParsedAttributesView Attrs;
Attrs.addAtEnd(Attribute);
ProcessDeclAttributeList(S, D, Attrs);
PragmaAttributeCurrentTargetDecl = nullptr;
}
}
}
void Sema::PrintPragmaAttributeInstantiationPoint() {
assert(PragmaAttributeCurrentTargetDecl && "Expected an active declaration");
Diags.Report(PragmaAttributeCurrentTargetDecl->getBeginLoc(),
diag::note_pragma_attribute_applied_decl_here);
}
void Sema::DiagnoseUnterminatedPragmaAttribute() {
if (PragmaAttributeStack.empty())
return;
Diag(PragmaAttributeStack.back().Loc, diag::err_pragma_attribute_no_pop_eof);
}
void Sema::ActOnPragmaOptimize(bool On, SourceLocation PragmaLoc) {
if(On)
OptimizeOffPragmaLocation = SourceLocation();
else
OptimizeOffPragmaLocation = PragmaLoc;
}
void Sema::AddRangeBasedOptnone(FunctionDecl *FD) {
// In the future, check other pragmas if they're implemented (e.g. pragma
// optimize 0 will probably map to this functionality too).
if(OptimizeOffPragmaLocation.isValid())
AddOptnoneAttributeIfNoConflicts(FD, OptimizeOffPragmaLocation);
}
void Sema::AddOptnoneAttributeIfNoConflicts(FunctionDecl *FD,
SourceLocation Loc) {
// Don't add a conflicting attribute. No diagnostic is needed.
if (FD->hasAttr<MinSizeAttr>() || FD->hasAttr<AlwaysInlineAttr>())
return;
// Add attributes only if required. Optnone requires noinline as well, but if
// either is already present then don't bother adding them.
if (!FD->hasAttr<OptimizeNoneAttr>())
FD->addAttr(OptimizeNoneAttr::CreateImplicit(Context, Loc));
if (!FD->hasAttr<NoInlineAttr>())
FD->addAttr(NoInlineAttr::CreateImplicit(Context, Loc));
}
typedef std::vector<std::pair<unsigned, SourceLocation> > VisStack;
enum : unsigned { NoVisibility = ~0U };
void Sema::AddPushedVisibilityAttribute(Decl *D) {
if (!VisContext)
return;
NamedDecl *ND = dyn_cast<NamedDecl>(D);
if (ND && ND->getExplicitVisibility(NamedDecl::VisibilityForValue))
return;
VisStack *Stack = static_cast<VisStack*>(VisContext);
unsigned rawType = Stack->back().first;
if (rawType == NoVisibility) return;
VisibilityAttr::VisibilityType type
= (VisibilityAttr::VisibilityType) rawType;
SourceLocation loc = Stack->back().second;
D->addAttr(VisibilityAttr::CreateImplicit(Context, type, loc));
}
/// FreeVisContext - Deallocate and null out VisContext.
void Sema::FreeVisContext() {
delete static_cast<VisStack*>(VisContext);
VisContext = nullptr;
}
static void PushPragmaVisibility(Sema &S, unsigned type, SourceLocation loc) {
// Put visibility on stack.
if (!S.VisContext)
S.VisContext = new VisStack;
VisStack *Stack = static_cast<VisStack*>(S.VisContext);
Stack->push_back(std::make_pair(type, loc));
}
void Sema::ActOnPragmaVisibility(const IdentifierInfo* VisType,
SourceLocation PragmaLoc) {
if (VisType) {
// Compute visibility to use.
VisibilityAttr::VisibilityType T;
if (!VisibilityAttr::ConvertStrToVisibilityType(VisType->getName(), T)) {
Diag(PragmaLoc, diag::warn_attribute_unknown_visibility) << VisType;
return;
}
PushPragmaVisibility(*this, T, PragmaLoc);
} else {
PopPragmaVisibility(false, PragmaLoc);
}
}
void Sema::ActOnPragmaFPContract(SourceLocation Loc,
LangOptions::FPModeKind FPC) {
FPOptionsOverride NewFPFeatures = CurFPFeatureOverrides();
switch (FPC) {
case LangOptions::FPM_On:
NewFPFeatures.setAllowFPContractWithinStatement();
break;
case LangOptions::FPM_Fast:
NewFPFeatures.setAllowFPContractAcrossStatement();
break;
case LangOptions::FPM_Off:
NewFPFeatures.setDisallowFPContract();
break;
case LangOptions::FPM_FastHonorPragmas:
llvm_unreachable("Should not happen");
}
FpPragmaStack.Act(Loc, Sema::PSK_Set, StringRef(), NewFPFeatures);
CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
}
void Sema::ActOnPragmaFPReassociate(SourceLocation Loc, bool IsEnabled) {
FPOptionsOverride NewFPFeatures = CurFPFeatureOverrides();
NewFPFeatures.setAllowFPReassociateOverride(IsEnabled);
FpPragmaStack.Act(Loc, PSK_Set, StringRef(), NewFPFeatures);
CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
}
void Sema::setRoundingMode(SourceLocation Loc, llvm::RoundingMode FPR) {
// C2x: 7.6.2p3 If the FE_DYNAMIC mode is specified and FENV_ACCESS is "off",
// the translator may assume that the default rounding mode is in effect.
if (FPR == llvm::RoundingMode::Dynamic &&
!CurFPFeatures.getAllowFEnvAccess() &&
CurFPFeatures.getFPExceptionMode() == LangOptions::FPE_Ignore)
FPR = llvm::RoundingMode::NearestTiesToEven;
FPOptionsOverride NewFPFeatures = CurFPFeatureOverrides();
NewFPFeatures.setRoundingModeOverride(FPR);
FpPragmaStack.Act(Loc, PSK_Set, StringRef(), NewFPFeatures);
CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
}
void Sema::setExceptionMode(SourceLocation Loc,
LangOptions::FPExceptionModeKind FPE) {
FPOptionsOverride NewFPFeatures = CurFPFeatureOverrides();
NewFPFeatures.setFPExceptionModeOverride(FPE);
FpPragmaStack.Act(Loc, PSK_Set, StringRef(), NewFPFeatures);
CurFPFeatures = NewFPFeatures.applyOverrides(getLangOpts());
}
void Sema::ActOnPragmaFEnvAccess(SourceLocation Loc, bool IsEnabled) {
FPOptionsOverride NewFPFeatures = CurFPFeatureOverrides();
auto LO = getLangOpts();
if (IsEnabled) {
// Verify Microsoft restriction:
// You can't enable fenv_access unless precise semantics are enabled.
// Precise semantics can be enabled either by the float_control
// pragma, or by using the /fp:precise or /fp:strict compiler options
if (!isPreciseFPEnabled())
Diag(Loc, diag::err_pragma_fenv_requires_precise);
NewFPFeatures.setAllowFEnvAccessOverride(true);
// Enabling FENV access sets the RoundingMode to Dynamic.
// and ExceptionBehavior to Strict
NewFPFeatures.setRoundingModeOverride(llvm::RoundingMode::Dynamic);
NewFPFeatures.setFPExceptionModeOverride(LangOptions::FPE_Strict);
} else {
NewFPFeatures.setAllowFEnvAccessOverride(false);
}
FpPragmaStack.Act(Loc, PSK_Set, StringRef(), NewFPFeatures);
CurFPFeatures = NewFPFeatures.applyOverrides(LO);
}
void Sema::ActOnPragmaFPExceptions(SourceLocation Loc,
LangOptions::FPExceptionModeKind FPE) {
setExceptionMode(Loc, FPE);
}
void Sema::PushNamespaceVisibilityAttr(const VisibilityAttr *Attr,
SourceLocation Loc) {
// Visibility calculations will consider the namespace's visibility.
// Here we just want to note that we're in a visibility context
// which overrides any enclosing #pragma context, but doesn't itself
// contribute visibility.
PushPragmaVisibility(*this, NoVisibility, Loc);
}
void Sema::PopPragmaVisibility(bool IsNamespaceEnd, SourceLocation EndLoc) {
if (!VisContext) {
Diag(EndLoc, diag::err_pragma_pop_visibility_mismatch);
return;
}
// Pop visibility from stack
VisStack *Stack = static_cast<VisStack*>(VisContext);
const std::pair<unsigned, SourceLocation> *Back = &Stack->back();
bool StartsWithPragma = Back->first != NoVisibility;
if (StartsWithPragma && IsNamespaceEnd) {
Diag(Back->second, diag::err_pragma_push_visibility_mismatch);
Diag(EndLoc, diag::note_surrounding_namespace_ends_here);
// For better error recovery, eat all pushes inside the namespace.
do {
Stack->pop_back();
Back = &Stack->back();
StartsWithPragma = Back->first != NoVisibility;
} while (StartsWithPragma);
} else if (!StartsWithPragma && !IsNamespaceEnd) {
Diag(EndLoc, diag::err_pragma_pop_visibility_mismatch);
Diag(Back->second, diag::note_surrounding_namespace_starts_here);
return;
}
Stack->pop_back();
// To simplify the implementation, never keep around an empty stack.
if (Stack->empty())
FreeVisContext();
}
template <typename Ty>
static bool checkCommonAttributeFeatures(Sema &S, const Ty *Node,
const ParsedAttr &A,
bool SkipArgCountCheck) {
// Several attributes carry different semantics than the parsing requires, so
// those are opted out of the common argument checks.
//
// We also bail on unknown and ignored attributes because those are handled
// as part of the target-specific handling logic.
if (A.getKind() == ParsedAttr::UnknownAttribute)
return false;
// Check whether the attribute requires specific language extensions to be
// enabled.
if (!A.diagnoseLangOpts(S))
return true;
// Check whether the attribute appertains to the given subject.
if (!A.diagnoseAppertainsTo(S, Node))
return true;
// Check whether the attribute is mutually exclusive with other attributes
// that have already been applied to the declaration.
if (!A.diagnoseMutualExclusion(S, Node))
return true;
// Check whether the attribute exists in the target architecture.
if (S.CheckAttrTarget(A))
return true;
if (A.hasCustomParsing())
return false;
if (!SkipArgCountCheck) {
if (A.getMinArgs() == A.getMaxArgs()) {
// If there are no optional arguments, then checking for the argument
// count is trivial.
if (!A.checkExactlyNumArgs(S, A.getMinArgs()))
return true;
} else {
// There are optional arguments, so checking is slightly more involved.
if (A.getMinArgs() && !A.checkAtLeastNumArgs(S, A.getMinArgs()))
return true;
else if (!A.hasVariadicArg() && A.getMaxArgs() &&
!A.checkAtMostNumArgs(S, A.getMaxArgs()))
return true;
}
}
return false;
}
bool Sema::checkCommonAttributeFeatures(const Decl *D, const ParsedAttr &A,
bool SkipArgCountCheck) {
return ::checkCommonAttributeFeatures(*this, D, A, SkipArgCountCheck);
}
bool Sema::checkCommonAttributeFeatures(const Stmt *S, const ParsedAttr &A,
bool SkipArgCountCheck) {
return ::checkCommonAttributeFeatures(*this, S, A, SkipArgCountCheck);
}
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