304f1d59ca
This switches everything to use the memory attribute proposed in https://discourse.llvm.org/t/rfc-unify-memory-effect-attributes/65579. The old argmemonly, inaccessiblememonly and inaccessiblemem_or_argmemonly attributes are dropped. The readnone, readonly and writeonly attributes are restricted to parameters only. The old attributes are auto-upgraded both in bitcode and IR. The bitcode upgrade is a policy requirement that has to be retained indefinitely. The IR upgrade is mainly there so it's not necessary to update all tests using memory attributes in this patch, which is already large enough. We could drop that part after migrating tests, or retain it longer term, to make it easier to import IR from older LLVM versions. High-level Function/CallBase APIs like doesNotAccessMemory() or setDoesNotAccessMemory() are mapped transparently to the memory attribute. Code that directly manipulates attributes (e.g. via AttributeList) on the other hand needs to switch to working with the memory attribute instead. Differential Revision: https://reviews.llvm.org/D135780
85 lines
4.2 KiB
Objective-C
85 lines
4.2 KiB
Objective-C
// RUN: %clang_cc1 -no-opaque-pointers -triple x86_64-apple-darwin10 -Wno-objc-root-class -emit-llvm -o - %s | FileCheck %s
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// -- classref for the message send in main()
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//
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// The class is declared with objc_class_stub, so LSB of the class pointer
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// must be set to 1.
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//
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// CHECK-LABEL: @"OBJC_CLASSLIST_REFERENCES_$_" = internal global i8* getelementptr (i8, i8* bitcast (%struct._class_t* @"OBJC_CLASS_$_Base" to i8*), i32 1), align 8
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// -- classref for the super message send in anotherClassMethod()
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//
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// Metaclasses do not use the "stub" mechanism and are referenced statically.
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//
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// CHECK-LABEL: @"OBJC_CLASSLIST_SUP_REFS_$_" = private global %struct._class_t* @"OBJC_METACLASS_$_Derived", section "__DATA,__objc_superrefs,regular,no_dead_strip", align 8
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// -- classref for the super message send in anotherInstanceMethod()
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//
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// The class is declared with objc_class_stub, so LSB of the class pointer
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// must be set to 1.
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//
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// CHECK-LABEL: @"OBJC_CLASSLIST_SUP_REFS_$_.1" = private global i8* getelementptr (i8, i8* bitcast (%struct._class_t* @"OBJC_CLASS_$_Derived" to i8*), i32 1), section "__DATA,__objc_superrefs,regular,no_dead_strip", align 8
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// -- category list for class stubs goes in __objc_catlist2.
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//
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// CHECK-LABEL: @"OBJC_LABEL_STUB_CATEGORY_$" = private global [1 x i8*] [i8* bitcast (%struct._category_t* @"_OBJC_$_CATEGORY_Derived_$_MyCategory" to i8*)], section "__DATA,__objc_catlist2,regular,no_dead_strip", align 8
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__attribute__((objc_class_stub))
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__attribute__((objc_subclassing_restricted))
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@interface Base
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+ (void) classMethod;
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- (void) instanceMethod;
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@end
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__attribute__((objc_class_stub))
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__attribute__((objc_subclassing_restricted))
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@interface Derived : Base
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@end
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int main(void) {
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[Base classMethod];
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}
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// CHECK-LABEL: define{{.*}} i32 @main()
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[CLASS:%.*]] = call %struct._class_t* @objc_loadClassref(i8** @"OBJC_CLASSLIST_REFERENCES_$_")
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// CHECK-NEXT: [[RECEIVER:%.*]] = bitcast %struct._class_t* [[CLASS]] to i8*
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// CHECK-NEXT: [[SELECTOR:%.*]] = load i8*, i8** @OBJC_SELECTOR_REFERENCES_
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// CHECK-NEXT: call void bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to void (i8*, i8*)*)(i8* noundef [[RECEIVER]], i8* noundef [[SELECTOR]])
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// CHECK-NEXT: ret i32 0
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// CHECK-LABEL: declare extern_weak %struct._class_t* @objc_loadClassref(i8**)
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// CHECK-SAME: [[ATTRLIST:#.*]]
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@implementation Derived (MyCategory)
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+ (void) anotherClassMethod {
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[super classMethod];
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}
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// CHECK-LABEL: define internal void @"\01+[Derived(MyCategory) anotherClassMethod]"(i8* noundef %self, i8* noundef %_cmd) #0 {
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// CHECK-NEXT: entry:
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// CHECK: [[SUPER:%.*]] = alloca %struct._objc_super, align 8
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// CHECK: [[METACLASS_REF:%.*]] = load %struct._class_t*, %struct._class_t** @"OBJC_CLASSLIST_SUP_REFS_$_", align 8
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// CHECK: [[CAST_METACLASS_REF:%.*]] = bitcast %struct._class_t* [[METACLASS_REF]] to i8*
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// CHECK: [[DEST:%.*]] = getelementptr inbounds %struct._objc_super, %struct._objc_super* [[SUPER]], i32 0, i32 1
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// CHECK: store i8* [[CAST_METACLASS_REF]], i8** [[DEST]], align 8
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// CHECK: call void bitcast (i8* (%struct._objc_super*, i8*, ...)* @objc_msgSendSuper2 to void (%struct._objc_super*, i8*)*)(%struct._objc_super* noundef [[SUPER]], i8* noundef {{%.*}})
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// CHECK: ret void
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- (void) anotherInstanceMethod {
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[super instanceMethod];
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}
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// CHECK-LABEL: define internal void @"\01-[Derived(MyCategory) anotherInstanceMethod]"(%0* noundef %self, i8* noundef %_cmd) #0 {
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// CHECK-NEXT: entry:
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// CHECK: [[SUPER:%.*]] = alloca %struct._objc_super, align 8
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// CHECK: [[CLASS_REF:%.*]] = call %struct._class_t* @objc_loadClassref(i8** @"OBJC_CLASSLIST_SUP_REFS_$_.1")
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// CHECK: [[CAST_CLASS_REF:%.*]] = bitcast %struct._class_t* [[CLASS_REF]] to i8*
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// CHECK: [[DEST:%.*]] = getelementptr inbounds %struct._objc_super, %struct._objc_super* [[SUPER]], i32 0, i32 1
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// CHECK: store i8* [[CAST_CLASS_REF]], i8** [[DEST]], align 8
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// CHECK: call void bitcast (i8* (%struct._objc_super*, i8*, ...)* @objc_msgSendSuper2 to void (%struct._objc_super*, i8*)*)(%struct._objc_super* noundef [[SUPER]], i8* noundef {{%.*}})
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// CHECK: ret void
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@end
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// -- calls to objc_loadClassRef() are readnone
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// CHECK: attributes [[ATTRLIST]] = { nounwind nonlazybind memory(none) }
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