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The attributes `sized_by`, `counted_by_or_null` and `sized_by_or_null` have been added as variants on `counted_by`, each with slightly different semantics. `sized_by` takes a byte size parameter instead of an element count, allowing pointees with unknown size. The `counted_by_or_null` and `sized_by_or_null` variants are equivalent to their base variants, except the pointer can be null regardless of count/size value. If the pointer is null the size is effectively 0. rdar://125400354
46 lines
2.0 KiB
C
46 lines
2.0 KiB
C
// RUN: %clang_cc1 -fexperimental-late-parse-attributes %s -ast-dump | FileCheck %s
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#define __counted_by_or_null(f) __attribute__((counted_by_or_null(f)))
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struct size_known {
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int field;
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};
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//==============================================================================
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// __counted_by_or_null on struct member pointer in decl attribute position
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//==============================================================================
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struct on_member_pointer_complete_ty {
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struct size_known *buf __counted_by_or_null(count);
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int count;
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};
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// CHECK-LABEL: struct on_member_pointer_complete_ty definition
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// CHECK-NEXT: |-FieldDecl {{.*}} buf 'struct size_known * __counted_by_or_null(count)':'struct size_known *'
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// CHECK-NEXT: `-FieldDecl {{.*}} referenced count 'int'
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struct on_pointer_anon_count {
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struct size_known *buf __counted_by_or_null(count);
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struct {
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int count;
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};
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};
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// CHECK-LABEL: struct on_pointer_anon_count definition
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// CHECK-NEXT: |-FieldDecl {{.*}} buf 'struct size_known * __counted_by_or_null(count)':'struct size_known *'
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// CHECK-NEXT: |-RecordDecl {{.*}} struct definition
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// CHECK-NEXT: | `-FieldDecl {{.*}} count 'int'
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// CHECK-NEXT: |-FieldDecl {{.*}} implicit 'struct on_pointer_anon_count::(anonymous at {{.*}})'
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// CHECK-NEXT: `-IndirectFieldDecl {{.*}} implicit referenced count 'int'
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// CHECK-NEXT: |-Field {{.*}} '' 'struct on_pointer_anon_count::(anonymous at {{.*}})'
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// CHECK-NEXT: `-Field {{.*}} 'count' 'int'
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//==============================================================================
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// __counted_by_or_null on struct member pointer in type attribute position
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//==============================================================================
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// TODO: Correctly parse counted_by_or_null as a type attribute. Currently it is parsed
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// as a declaration attribute and is **not** late parsed resulting in the `count`
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// field being unavailable.
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//
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// See `clang/test/Sema/attr-counted-by-late-parsed-struct-ptrs.c` for test
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// cases.
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