This revision was automatically updated to reflect the committed changes.
Closed by commit rL352084: Add a priority field to availability attributes to
prioritize explicit (authored by arphaman, committed by ).
Herald added a subscriber: llvm-commits.
Changed prior to commit:
https://reviews.llvm.org/D56892?vs=182608&id=183353#toc
Repository:
rL LLVM
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D56892/new/
https://reviews.llvm.org/D56892
Files:
cfe/trunk/include/clang/Basic/Attr.td
cfe/trunk/include/clang/Basic/AttrDocs.td
cfe/trunk/include/clang/Sema/ParsedAttr.h
cfe/trunk/include/clang/Sema/Sema.h
cfe/trunk/lib/Sema/SemaAttr.cpp
cfe/trunk/lib/Sema/SemaDecl.cpp
cfe/trunk/lib/Sema/SemaDeclAttr.cpp
cfe/trunk/test/SemaObjC/attr-availability-priority.m
Index: cfe/trunk/include/clang/Sema/Sema.h
===================================================================
--- cfe/trunk/include/clang/Sema/Sema.h
+++ cfe/trunk/include/clang/Sema/Sema.h
@@ -2459,18 +2459,38 @@
AMK_ProtocolImplementation,
};
+ /// Describes the kind of priority given to an availability attribute.
+ ///
+ /// The sum of priorities deteremines the final priority of the attribute.
+ /// The final priority determines how the attribute will be merged.
+ /// An attribute with a lower priority will always remove higher priority
+ /// attributes for the specified platform when it is being applied. An
+ /// attribute with a higher priority will not be applied if the declaration
+ /// already has an availability attribute with a lower priority for the
+ /// specified platform. The final prirority values are not expected to match
+ /// the values in this enumeration, but instead should be treated as a plain
+ /// integer value. This enumeration just names the priority weights that are
+ /// used to calculate that final vaue.
+ enum AvailabilityPriority : int {
+ /// The availability attribute was specified explicitly next to the
+ /// declaration.
+ AP_Explicit = 0,
+
+ /// The availability attribute was applied using '#pragma clang attribute'.
+ AP_PragmaClangAttribute = 1,
+
+ /// The availability attribute for a specific platform was inferred from
+ /// an availability attribute for another platform.
+ AP_InferredFromOtherPlatform = 2
+ };
+
/// Attribute merging methods. Return true if a new attribute was added.
- AvailabilityAttr *mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
- IdentifierInfo *Platform,
- bool Implicit,
- VersionTuple Introduced,
- VersionTuple Deprecated,
- VersionTuple Obsoleted,
- bool IsUnavailable,
- StringRef Message,
- bool IsStrict, StringRef Replacement,
- AvailabilityMergeKind AMK,
- unsigned AttrSpellingListIndex);
+ AvailabilityAttr *mergeAvailabilityAttr(
+ NamedDecl *D, SourceRange Range, IdentifierInfo *Platform, bool Implicit,
+ VersionTuple Introduced, VersionTuple Deprecated, VersionTuple Obsoleted,
+ bool IsUnavailable, StringRef Message, bool IsStrict,
+ StringRef Replacement, AvailabilityMergeKind AMK, int Priority,
+ unsigned AttrSpellingListIndex);
TypeVisibilityAttr *mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
TypeVisibilityAttr::VisibilityType Vis,
unsigned AttrSpellingListIndex);
Index: cfe/trunk/include/clang/Sema/ParsedAttr.h
===================================================================
--- cfe/trunk/include/clang/Sema/ParsedAttr.h
+++ cfe/trunk/include/clang/Sema/ParsedAttr.h
@@ -207,6 +207,9 @@
/// A cached value.
mutable unsigned ProcessingCache : 8;
+ /// True if the attribute is specified using '#pragma clang attribute'.
+ mutable unsigned IsPragmaClangAttribute : 1;
+
/// The location of the 'unavailable' keyword in an
/// availability attribute.
SourceLocation UnavailableLoc;
@@ -238,7 +241,8 @@
ScopeLoc(scopeLoc), EllipsisLoc(ellipsisLoc), NumArgs(numArgs),
SyntaxUsed(syntaxUsed), Invalid(false), UsedAsTypeAttr(false),
IsAvailability(false), IsTypeTagForDatatype(false), IsProperty(false),
- HasParsedType(false), HasProcessingCache(false) {
+ HasParsedType(false), HasProcessingCache(false),
+ IsPragmaClangAttribute(false) {
if (numArgs) memcpy(getArgsBuffer(), args, numArgs * sizeof(ArgsUnion));
AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
}
@@ -255,8 +259,8 @@
ScopeLoc(scopeLoc), NumArgs(1), SyntaxUsed(syntaxUsed), Invalid(false),
UsedAsTypeAttr(false), IsAvailability(true),
IsTypeTagForDatatype(false), IsProperty(false), HasParsedType(false),
- HasProcessingCache(false), UnavailableLoc(unavailable),
- MessageExpr(messageExpr) {
+ HasProcessingCache(false), IsPragmaClangAttribute(false),
+ UnavailableLoc(unavailable), MessageExpr(messageExpr) {
ArgsUnion PVal(Parm);
memcpy(getArgsBuffer(), &PVal, sizeof(ArgsUnion));
new (getAvailabilityData()) detail::AvailabilityData(
@@ -273,7 +277,7 @@
ScopeLoc(scopeLoc), NumArgs(3), SyntaxUsed(syntaxUsed), Invalid(false),
UsedAsTypeAttr(false), IsAvailability(false),
IsTypeTagForDatatype(false), IsProperty(false), HasParsedType(false),
- HasProcessingCache(false) {
+ HasProcessingCache(false), IsPragmaClangAttribute(false) {
ArgsUnion *Args = getArgsBuffer();
Args[0] = Parm1;
Args[1] = Parm2;
@@ -290,7 +294,7 @@
ScopeLoc(scopeLoc), NumArgs(1), SyntaxUsed(syntaxUsed), Invalid(false),
UsedAsTypeAttr(false), IsAvailability(false),
IsTypeTagForDatatype(true), IsProperty(false), HasParsedType(false),
- HasProcessingCache(false) {
+ HasProcessingCache(false), IsPragmaClangAttribute(false) {
ArgsUnion PVal(ArgKind);
memcpy(getArgsBuffer(), &PVal, sizeof(ArgsUnion));
detail::TypeTagForDatatypeData &ExtraData = getTypeTagForDatatypeDataSlot();
@@ -308,7 +312,7 @@
ScopeLoc(scopeLoc), NumArgs(0), SyntaxUsed(syntaxUsed), Invalid(false),
UsedAsTypeAttr(false), IsAvailability(false),
IsTypeTagForDatatype(false), IsProperty(false), HasParsedType(true),
- HasProcessingCache(false) {
+ HasProcessingCache(false), IsPragmaClangAttribute(false) {
new (&getTypeBuffer()) ParsedType(typeArg);
AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
}
@@ -322,7 +326,7 @@
ScopeLoc(scopeLoc), NumArgs(0), SyntaxUsed(syntaxUsed), Invalid(false),
UsedAsTypeAttr(false), IsAvailability(false),
IsTypeTagForDatatype(false), IsProperty(true), HasParsedType(false),
- HasProcessingCache(false) {
+ HasProcessingCache(false), IsPragmaClangAttribute(false) {
new (&getPropertyDataBuffer()) detail::PropertyData(getterId, setterId);
AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
}
@@ -436,6 +440,11 @@
bool isUsedAsTypeAttr() const { return UsedAsTypeAttr; }
void setUsedAsTypeAttr() { UsedAsTypeAttr = true; }
+ /// True if the attribute is specified using '#pragma clang attribute'.
+ bool isPragmaClangAttribute() const { return IsPragmaClangAttribute; }
+
+ void setIsPragmaClangAttribute() { IsPragmaClangAttribute = true; }
+
bool isPackExpansion() const { return EllipsisLoc.isValid(); }
SourceLocation getEllipsisLoc() const { return EllipsisLoc; }
Index: cfe/trunk/include/clang/Basic/Attr.td
===================================================================
--- cfe/trunk/include/clang/Basic/Attr.td
+++ cfe/trunk/include/clang/Basic/Attr.td
@@ -717,7 +717,8 @@
let Args = [IdentifierArgument<"platform">, VersionArgument<"introduced">,
VersionArgument<"deprecated">, VersionArgument<"obsoleted">,
BoolArgument<"unavailable">, StringArgument<"message">,
- BoolArgument<"strict">, StringArgument<"replacement">];
+ BoolArgument<"strict">, StringArgument<"replacement">,
+ IntArgument<"priority">];
let AdditionalMembers =
[{static llvm::StringRef getPrettyPlatformName(llvm::StringRef Platform) {
return llvm::StringSwitch<llvm::StringRef>(Platform)
Index: cfe/trunk/include/clang/Basic/AttrDocs.td
===================================================================
--- cfe/trunk/include/clang/Basic/AttrDocs.td
+++ cfe/trunk/include/clang/Basic/AttrDocs.td
@@ -1152,11 +1152,14 @@
the deprecated declaration with the new declaration specified.
Multiple availability attributes can be placed on a declaration, which may
-correspond to different platforms. Only the availability attribute with the
-platform corresponding to the target platform will be used; any others will be
-ignored. If no availability attribute specifies availability for the current
-target platform, the availability attributes are ignored. Supported platforms
-are:
+correspond to different platforms. For most platforms, the availability
+attribute with the platform corresponding to the target platform will be used;
+any others will be ignored. However, the availability for ``watchOS`` and
+``tvOS`` can be implicitly inferred from an ``iOS`` availability attribute.
+Any explicit availability attributes for those platforms are still prefered over
+the implicitly inferred availability attributes. If no availability attribute
+specifies availability for the current target platform, the availability
+attributes are ignored. Supported platforms are:
``ios``
Apple's iOS operating system. The minimum deployment target is specified by
@@ -1229,6 +1232,63 @@
- (id)otherMethod API_AVAILABLE(macos(10.11), ios(11.0));
@end
+Availability attributes can also be applied using a ``#pragma clang attribute``.
+Any explicit availability attribute whose platform corresponds to the target
+platform is applied to a declaration regardless of the availability attributes
+specified in the pragma. For example, in the code below,
+``hasExplicitAvailabilityAttribute`` will use the ``macOS`` availability
+attribute that is specified with the declaration, whereas
+``getsThePragmaAvailabilityAttribute`` will use the ``macOS`` availability
+attribute that is applied by the pragma.
+
+.. code-block:: c
+
+ #pragma clang attribute push (__attribute__((availability(macOS, introduced=10.12))), apply_to=function)
+ void getsThePragmaAvailabilityAttribute(void);
+ void hasExplicitAvailabilityAttribute(void) __attribute__((availability(macos,introduced=10.4)));
+ #pragma clang attribute pop
+
+For platforms like ``watchOS`` and ``tvOS``, whose availability attributes can
+be implicitly inferred from an ``iOS`` availability attribute, the logic is
+slightly more complex. The explicit and the pragma-applied availability
+attributes whose platform corresponds to the target platform are applied as
+described in the previous paragraph. However, the implicitly inferred attributes
+are applied to a declaration only when there is no explicit or pragma-applied
+availability attribute whose platform corresponds to the target platform. For
+example, the function below will receive the ``tvOS`` availability from the
+pragma rather than using the inferred ``iOS`` availability from the declaration:
+
+.. code-block:: c
+
+ #pragma clang attribute push (__attribute__((availability(tvOS, introduced=12.0))), apply_to=function)
+ void getsThePragmaTVOSAvailabilityAttribute(void) __attribute__((availability(iOS,introduced=11.0)));
+ #pragma clang attribute pop
+
+The compiler is also able to apply implicly inferred attributes from a pragma
+as well. For example, when targeting ``tvOS``, the function below will receive
+a ``tvOS`` availability attribute that is implicitly inferred from the ``iOS``
+availability attribute applied by the pragma:
+
+.. code-block:: c
+
+ #pragma clang attribute push (__attribute__((availability(iOS, introduced=12.0))), apply_to=function)
+ void infersTVOSAvailabilityFromPragma(void);
+ #pragma clang attribute pop
+
+The implicit attributes that are inferred from explicitly specified attributes
+whose platform corresponds to the target platform are applied to the declaration
+even if there is an availability attribute that can be inferred from a pragma.
+For example, the function below will receive the ``tvOS, introduced=11.0``
+availability that is inferred from the attribute on the declaration rather than
+inferring availability from the pragma:
+
+.. code-block:: c
+
+ #pragma clang attribute push (__attribute__((availability(iOS, unavailable))), apply_to=function)
+ void infersTVOSAvailabilityFromAttributeNextToDeclaration(void)
+ __attribute__((availability(iOS,introduced=11.0)));
+ #pragma clang attribute pop
+
Also see the documentation for `@available
<http://clang.llvm.org/docs/LanguageExtensions.html#objective-c-available>`_
}];
Index: cfe/trunk/test/SemaObjC/attr-availability-priority.m
===================================================================
--- cfe/trunk/test/SemaObjC/attr-availability-priority.m
+++ cfe/trunk/test/SemaObjC/attr-availability-priority.m
@@ -0,0 +1,53 @@
+// RUN: %clang_cc1 -triple arm64-apple-tvos12.0 -fsyntax-only -verify %s
+
+void explicit() __attribute__((availability(tvos, introduced=11.0, deprecated=12.0))); // expected-note {{marked deprecated here}}
+void inferred() __attribute__((availability(ios, introduced=11.0, deprecated=12.0))); // expected-note {{marked deprecated here}}
+void explicitOverInferred()
+__attribute__((availability(ios, introduced=11.0, deprecated=12.0)))
+__attribute__((availability(tvos, introduced=11.0)));
+void explicitOverInferred2()
+__attribute__((availability(tvos, introduced=11.0)))
+__attribute__((availability(ios, introduced=11.0, deprecated=12.0)));
+
+void simpleUsage() {
+ explicit(); // expected-warning{{'explicit' is deprecated: first deprecated in tvOS 12.0}}
+ inferred(); // expected-warning{{'inferred' is deprecated: first deprecated in tvOS 12.0}}
+ // ok, not deprecated for tvOS.
+ explicitOverInferred();
+ explicitOverInferred2();
+}
+
+#pragma clang attribute push (__attribute__((availability(tvos, introduced=11.0, deprecated=12.0))), apply_to=function)
+
+void explicitFromPragma(); // expected-note {{marked deprecated here}}
+void explicitWinsOverExplicitFromPragma() __attribute__((availability(tvos, introduced=11.0)));
+void implicitLosesOverExplicitFromPragma() __attribute__((availability(ios, introduced=11.0))); // expected-note {{marked deprecated here}}
+
+#pragma clang attribute pop
+
+#pragma clang attribute push (__attribute__((availability(ios, introduced=11.0, deprecated=12.0))), apply_to=function)
+
+void implicitFromPragma(); // expected-note {{marked deprecated here}}
+void explicitWinsOverImplicitFromPragma() __attribute__((availability(tvos, introduced=11.0)));
+void implicitWinsOverImplicitFromPragma() __attribute__((availability(ios, introduced=11.0)));
+
+#pragma clang attribute pop
+
+#pragma clang attribute push (__attribute__((availability(tvos, introduced=11.0, deprecated=12.0))), apply_to=function)
+#pragma clang attribute push (__attribute__((availability(ios, introduced=11.0, deprecated=11.3))), apply_to=function)
+
+void pragmaExplicitWinsOverPragmaImplicit(); // expected-note {{marked deprecated here}}
+
+#pragma clang attribute pop
+#pragma clang attribute pop
+
+void pragmaUsage() {
+ explicitFromPragma(); // expected-warning {{'explicitFromPragma' is deprecated: first deprecated in tvOS 12.0}}
+ explicitWinsOverExplicitFromPragma(); // ok
+ implicitLosesOverExplicitFromPragma(); // expected-warning {{'implicitLosesOverExplicitFromPragma' is deprecated: first deprecated in tvOS 12.0}}
+
+ implicitFromPragma(); // expected-warning {{'implicitFromPragma' is deprecated: first deprecated in tvOS 12.0}}
+ explicitWinsOverImplicitFromPragma(); // ok
+ implicitWinsOverImplicitFromPragma(); // ok
+ pragmaExplicitWinsOverPragmaImplicit(); // expected-warning {{'pragmaExplicitWinsOverPragmaImplicit' is deprecated: first deprecated in tvOS 12.0}}
+}
Index: cfe/trunk/lib/Sema/SemaDecl.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaDecl.cpp
+++ cfe/trunk/lib/Sema/SemaDecl.cpp
@@ -2430,13 +2430,11 @@
InheritableAttr *NewAttr = nullptr;
unsigned AttrSpellingListIndex = Attr->getSpellingListIndex();
if (const auto *AA = dyn_cast<AvailabilityAttr>(Attr))
- NewAttr = S.mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(),
- AA->isImplicit(), AA->getIntroduced(),
- AA->getDeprecated(),
- AA->getObsoleted(), AA->getUnavailable(),
- AA->getMessage(), AA->getStrict(),
- AA->getReplacement(), AMK,
- AttrSpellingListIndex);
+ NewAttr = S.mergeAvailabilityAttr(
+ D, AA->getRange(), AA->getPlatform(), AA->isImplicit(),
+ AA->getIntroduced(), AA->getDeprecated(), AA->getObsoleted(),
+ AA->getUnavailable(), AA->getMessage(), AA->getStrict(),
+ AA->getReplacement(), AMK, AA->getPriority(), AttrSpellingListIndex);
else if (const auto *VA = dyn_cast<VisibilityAttr>(Attr))
NewAttr = S.mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
AttrSpellingListIndex);
Index: cfe/trunk/lib/Sema/SemaDeclAttr.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaDeclAttr.cpp
+++ cfe/trunk/lib/Sema/SemaDeclAttr.cpp
@@ -2283,18 +2283,11 @@
return false;
}
-AvailabilityAttr *Sema::mergeAvailabilityAttr(NamedDecl *D, SourceRange Range,
- IdentifierInfo *Platform,
- bool Implicit,
- VersionTuple Introduced,
- VersionTuple Deprecated,
- VersionTuple Obsoleted,
- bool IsUnavailable,
- StringRef Message,
- bool IsStrict,
- StringRef Replacement,
- AvailabilityMergeKind AMK,
- unsigned AttrSpellingListIndex) {
+AvailabilityAttr *Sema::mergeAvailabilityAttr(
+ NamedDecl *D, SourceRange Range, IdentifierInfo *Platform, bool Implicit,
+ VersionTuple Introduced, VersionTuple Deprecated, VersionTuple Obsoleted,
+ bool IsUnavailable, StringRef Message, bool IsStrict, StringRef Replacement,
+ AvailabilityMergeKind AMK, int Priority, unsigned AttrSpellingListIndex) {
VersionTuple MergedIntroduced = Introduced;
VersionTuple MergedDeprecated = Deprecated;
VersionTuple MergedObsoleted = Obsoleted;
@@ -2328,16 +2321,15 @@
}
// If there is an existing availability attribute for this platform that
- // is explicit and the new one is implicit use the explicit one and
- // discard the new implicit attribute.
- if (!OldAA->isImplicit() && Implicit) {
+ // has a lower priority use the existing one and discard the new
+ // attribute.
+ if (OldAA->getPriority() < Priority)
return nullptr;
- }
- // If there is an existing attribute for this platform that is implicit
- // and the new attribute is explicit then erase the old one and
- // continue processing the attributes.
- if (!Implicit && OldAA->isImplicit()) {
+ // If there is an existing attribute for this platform that has a higher
+ // priority than the new attribute then erase the old one and continue
+ // processing the attributes.
+ if (OldAA->getPriority() > Priority) {
Attrs.erase(Attrs.begin() + i);
--e;
continue;
@@ -2436,11 +2428,10 @@
if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
MergedDeprecated, MergedObsoleted) &&
!OverrideOrImpl) {
- auto *Avail = ::new (Context) AvailabilityAttr(Range, Context, Platform,
- Introduced, Deprecated,
- Obsoleted, IsUnavailable, Message,
- IsStrict, Replacement,
- AttrSpellingListIndex);
+ auto *Avail = ::new (Context)
+ AvailabilityAttr(Range, Context, Platform, Introduced, Deprecated,
+ Obsoleted, IsUnavailable, Message, IsStrict,
+ Replacement, Priority, AttrSpellingListIndex);
Avail->setImplicit(Implicit);
return Avail;
}
@@ -2483,15 +2474,13 @@
}
}
- AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND, AL.getRange(), II,
- false/*Implicit*/,
- Introduced.Version,
- Deprecated.Version,
- Obsoleted.Version,
- IsUnavailable, Str,
- IsStrict, Replacement,
- Sema::AMK_None,
- Index);
+ int PriorityModifier = AL.isPragmaClangAttribute()
+ ? Sema::AP_PragmaClangAttribute
+ : Sema::AP_Explicit;
+ AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
+ ND, AL.getRange(), II, false /*Implicit*/, Introduced.Version,
+ Deprecated.Version, Obsoleted.Version, IsUnavailable, Str, IsStrict,
+ Replacement, Sema::AMK_None, PriorityModifier, Index);
if (NewAttr)
D->addAttr(NewAttr);
@@ -2527,18 +2516,11 @@
auto NewDeprecated = adjustWatchOSVersion(Deprecated.Version);
auto NewObsoleted = adjustWatchOSVersion(Obsoleted.Version);
- AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
- AL.getRange(),
- NewII,
- true/*Implicit*/,
- NewIntroduced,
- NewDeprecated,
- NewObsoleted,
- IsUnavailable, Str,
- IsStrict,
- Replacement,
- Sema::AMK_None,
- Index);
+ AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
+ ND, AL.getRange(), NewII, true /*Implicit*/, NewIntroduced,
+ NewDeprecated, NewObsoleted, IsUnavailable, Str, IsStrict,
+ Replacement, Sema::AMK_None,
+ PriorityModifier + Sema::AP_InferredFromOtherPlatform, Index);
if (NewAttr)
D->addAttr(NewAttr);
}
@@ -2552,20 +2534,13 @@
NewII = &S.Context.Idents.get("tvos_app_extension");
if (NewII) {
- AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(ND,
- AL.getRange(),
- NewII,
- true/*Implicit*/,
- Introduced.Version,
- Deprecated.Version,
- Obsoleted.Version,
- IsUnavailable, Str,
- IsStrict,
- Replacement,
- Sema::AMK_None,
- Index);
- if (NewAttr)
- D->addAttr(NewAttr);
+ AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
+ ND, AL.getRange(), NewII, true /*Implicit*/, Introduced.Version,
+ Deprecated.Version, Obsoleted.Version, IsUnavailable, Str, IsStrict,
+ Replacement, Sema::AMK_None,
+ PriorityModifier + Sema::AP_InferredFromOtherPlatform, Index);
+ if (NewAttr)
+ D->addAttr(NewAttr);
}
}
}
Index: cfe/trunk/lib/Sema/SemaAttr.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaAttr.cpp
+++ cfe/trunk/lib/Sema/SemaAttr.cpp
@@ -522,6 +522,7 @@
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>
@@ -679,6 +680,8 @@
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;
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