[OBJC] Add attribute to mark Objective C class as non-lazy
A non-lazy class will be initialized eagerly when the Objective-C runtime is loaded. This is required for certain system classes which have instances allocated in non-standard ways, such as the classes for blocks and constant strings. Adding this attribute is essentially equivalent to providing a trivial +load method but avoids the (fairly small) load-time overheads associated with defining and calling such a method. Differential Revision: https://reviews.llvm.org/D56555 llvm-svn: 353116
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@ -1758,6 +1758,13 @@ def ObjCRootClass : InheritableAttr {
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let Documentation = [Undocumented];
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}
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def ObjCNonLazyClass : Attr {
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let Spellings = [Clang<"objc_nonlazy_class">];
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let Subjects = SubjectList<[ObjCInterface], ErrorDiag>;
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let LangOpts = [ObjC];
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let Documentation = [ObjCNonLazyClassDocs];
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}
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def ObjCSubclassingRestricted : InheritableAttr {
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let Spellings = [Clang<"objc_subclassing_restricted">];
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let Subjects = SubjectList<[ObjCInterface], ErrorDiag>;
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@ -3699,6 +3699,19 @@ ensure that this class cannot be subclassed.
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}];
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}
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def ObjCNonLazyClassDocs : Documentation {
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let Category = DocCatType;
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let Content = [{
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This attribute can be added to an Objective-C ``@interface`` declaration to
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add the class to the list of non-lazily initialized classes. A non-lazy class
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will be initialized eagerly when the Objective-C runtime is loaded. This is
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required for certain system classes which have instances allocated in
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non-standard ways, such as the classes for blocks and constant strings. Adding
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this attribute is essentially equivalent to providing a trivial `+load` method
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but avoids the (fairly small) load-time overheads associated with defining and
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calling such a method.
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}];
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}
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def SelectAnyDocs : Documentation {
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let Category = DocCatType;
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@ -6261,9 +6261,10 @@ CGObjCNonFragileABIMac::BuildClassObject(const ObjCInterfaceDecl *CI,
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return GV;
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}
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bool
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CGObjCNonFragileABIMac::ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
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return OD->getClassMethod(GetNullarySelector("load")) != nullptr;
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bool CGObjCNonFragileABIMac::ImplementationIsNonLazy(
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const ObjCImplDecl *OD) const {
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return OD->getClassMethod(GetNullarySelector("load")) != nullptr ||
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OD->getClassInterface()->hasAttr<ObjCNonLazyClassAttr>();
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}
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void CGObjCNonFragileABIMac::GetClassSizeInfo(const ObjCImplementationDecl *OID,
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@ -6832,6 +6832,9 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
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case ParsedAttr::AT_ObjCRootClass:
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handleSimpleAttribute<ObjCRootClassAttr>(S, D, AL);
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break;
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case ParsedAttr::AT_ObjCNonLazyClass:
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handleSimpleAttribute<ObjCNonLazyClassAttr>(S, D, AL);
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break;
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case ParsedAttr::AT_ObjCSubclassingRestricted:
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handleSimpleAttribute<ObjCSubclassingRestrictedAttr>(S, D, AL);
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break;
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@ -1,6 +1,6 @@
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// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -Wno-objc-root-class -emit-llvm -o - %s | \
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// RUN: FileCheck %s
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// CHECK: @"OBJC_LABEL_NONLAZY_CLASS_$" = private global [1 x {{.*}}] {{.*}}@"OBJC_CLASS_$_A"{{.*}}, section "__DATA,__objc_nlclslist,regular,no_dead_strip", align 8
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// CHECK: @"OBJC_LABEL_NONLAZY_CLASS_$" = private global [2 x {{.*}}]{{.*}}@"OBJC_CLASS_$_A"{{.*}},{{.*}}@"OBJC_CLASS_$_D"{{.*}} section "__DATA,__objc_nlclslist,regular,no_dead_strip", align 8
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// CHECK: @"OBJC_LABEL_NONLAZY_CATEGORY_$" = private global [1 x {{.*}}] {{.*}}@"\01l_OBJC_$_CATEGORY_A_$_Cat"{{.*}}, section "__DATA,__objc_nlcatlist,regular,no_dead_strip", align 8
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@interface A @end
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@ -30,3 +30,8 @@
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@interface C : A @end
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@implementation C
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@end
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__attribute__((objc_nonlazy_class))
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@interface D @end
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@implementation D @end
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@ -100,6 +100,7 @@
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// CHECK-NEXT: ObjCExplicitProtocolImpl (SubjectMatchRule_objc_protocol)
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// CHECK-NEXT: ObjCExternallyRetained (SubjectMatchRule_variable_not_is_parameter, SubjectMatchRule_function, SubjectMatchRule_block, SubjectMatchRule_objc_method)
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// CHECK-NEXT: ObjCMethodFamily (SubjectMatchRule_objc_method)
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// CHECK-NEXT: ObjCNonLazyClass (SubjectMatchRule_objc_interface)
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// CHECK-NEXT: ObjCPreciseLifetime (SubjectMatchRule_variable)
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// CHECK-NEXT: ObjCRequiresPropertyDefs (SubjectMatchRule_objc_interface)
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// CHECK-NEXT: ObjCRequiresSuper (SubjectMatchRule_objc_method)
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@ -0,0 +1,34 @@
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// RUN: %clang_cc1 -verify -Wno-objc-root-class -fsyntax-only %s
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__attribute__((objc_nonlazy_class))
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@interface A
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@end
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@implementation A
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@end
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__attribute__((objc_nonlazy_class)) int X; // expected-error {{'objc_nonlazy_class' attribute only applies to Objective-C interfaces}}
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__attribute__((objc_nonlazy_class()))
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@interface B
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@end
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@implementation B
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@end
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__attribute__((objc_nonlazy_class("foo"))) // expected-error{{'objc_nonlazy_class' attribute takes no arguments}}
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@interface C
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@end
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@implementation C
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@end
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__attribute__((objc_nonlazy_class)) // expected-error {{'objc_nonlazy_class' attribute only applies to Objective-C interfaces}}
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@protocol B
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@end
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__attribute__((objc_nonlazy_class)) // expected-error {{'objc_nonlazy_class' attribute only applies to Objective-C interfaces}}
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void foo();
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@interface E
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@end
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__attribute__((objc_nonlazy_class))
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@implementation E // expected-error {{prefix attribute must be followed by an interface or protocol}}
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@end
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