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llvm-project/clang/test/SemaObjC/attr-swift-error.m

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Sema: add support for `__attribute__((__swift_error__))` Introduce a new attribute that is used to indicate the error handling convention used by a function. This is used to translate the error semantics from the decorated interface to a compatible Swift interface. The supported error convention is one of: - none: no error handling - nonnull_error: a non-null error parameter indicates an error signifier - null_result: a return value of NULL is an error signifier - zero_result: a return value of 0 is an error signifier - nonzero_result: a non-zero return value is an error signifier Since this is the first of the attributes needed to support the semantic annotation for Swift, this change also includes the necessary supporting infrastructure for a new category of attributes (Swift). This is based on the work of the original changes in https://github.com/llvm/llvm-project-staging/commit/8afaf3aad2af43cfedca7a24cd817848c4e95c0c Differential Revision: https://reviews.llvm.org/D87331 Reviewed By: John McCall, Aaron Ballman, Dmitri Gribenko
2020-09-09 05:19:43 +08:00
// RUN: %clang_cc1 -verify -fsyntax-only -fobjc-arc -fblocks %s
@class NSError;
#if __SIZEOF_POINTER__ == 4
typedef unsigned char BOOL;
#else
typedef _Bool BOOL;
#endif
typedef struct __attribute__((__objc_bridge__(NSError))) __CFError *CFErrorRef;
extern int f0(void) __attribute__((__swift_error__));
// expected-error@-1 {{'__swift_error__' attribute takes one argument}}
extern int f1(void) __attribute__((__swift_error__(invalid)));
// expected-warning@-1 {{'__swift_error__' attribute argument not supported: 'invalid'}}
extern int f2(void) __attribute__((__swift_error__(none,zero_result)));
// expected-error@-1 {{use of undeclared identifier 'zero_result'}}
@interface Erroneous
- (BOOL)m0:(NSError **)error __attribute__((__swift_error__(none)));
- (BOOL)m1:(NSError **)error __attribute__((__swift_error__(nonnull_error)));
- (BOOL)m2:(NSError **)error __attribute__((__swift_error__(null_result)));
// expected-error@-1 {{'__swift_error__' attribute with 'null_result' convention can only be applied to a method returning a pointer}}
- (BOOL)m3:(NSError **)error __attribute__((__swift_error__(nonzero_result)));
- (BOOL)m4:(NSError **)error __attribute__((__swift_error__(zero_result)));
- (Undeclared)n0:(NSError **)error __attribute__((__swift_error__(none)));
// expected-error@-1 {{expected a type}}
- (Undeclared)n1:(NSError **)error __attribute__((__swift_error__(nonnull_error)));
// expected-error@-1 {{expected a type}}
- (Undeclared)n2:(NSError **)error __attribute__((__swift_error__(null_result)));
// expected-error@-1 {{expected a type}}
- (Undeclared)n3:(NSError **)error __attribute__((__swift_error__(nonzero_result)));
// expected-error@-1 {{expected a type}}
// FIXME: the follow-on warning should really be suppressed, but apparently
// having an ill-formed return type doesn't mark anything as invalid.
// expected-error@-4 {{can only be applied}}
- (Undeclared)n4:(NSError **)error __attribute__((__swift_error__(zero_result)));
// expected-error@-1 {{expected a type}}
// FIXME: the follow-on warning should really be suppressed, but apparently
// having an ill-formed return type doesn't mark anything as invalid.
// expected-error@-4 {{can only be applied}}
- (instancetype)o0 __attribute__((__swift_error__(none)));
- (instancetype)o1 __attribute__((__swift_error__(nonnull_error)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a method with an error parameter}}
- (instancetype)o2 __attribute__((__swift_error__(null_result)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a method with an error parameter}}
- (instancetype)o3 __attribute__((__swift_error__(nonzero_result)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a method with an error parameter}}
- (instancetype)o4 __attribute__((__swift_error__(zero_result)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a method with an error parameter}}
@end
extern BOOL m0(CFErrorRef *) __attribute__((__swift_error__(none)));
extern BOOL m1(CFErrorRef *) __attribute__((__swift_error__(nonnull_error)));
extern BOOL m2(CFErrorRef *) __attribute__((__swift_error__(null_result)));
// expected-error@-1 {{'__swift_error__' attribute with 'null_result' convention can only be applied to a function returning a pointer}}
extern BOOL m3(CFErrorRef *) __attribute__((__swift_error__(nonzero_result)));
extern BOOL m4(CFErrorRef *) __attribute__((__swift_error__(zero_result)));
extern Undeclared n0(CFErrorRef *) __attribute__((__swift_error__(none)));
// expected-error@-1 {{unknown type name 'Undeclared'}}
extern Undeclared n1(CFErrorRef *) __attribute__((__swift_error__(nonnull_error)));
// expected-error@-1 {{unknown type name 'Undeclared'}}
extern Undeclared n2(CFErrorRef *) __attribute__((__swift_error__(null_result)));
// expected-error@-1 {{unknown type name 'Undeclared'}}
extern Undeclared n3(CFErrorRef *) __attribute__((__swift_error__(nonzero_result)));
// expected-error@-1 {{unknown type name 'Undeclared'}}
extern Undeclared n4(CFErrorRef *) __attribute__((__swift_error__(zero_result)));
// expected-error@-1 {{unknown type name 'Undeclared'}}
extern void *o0(CFErrorRef *) __attribute__((__swift_error__(none)));
extern void *o1(CFErrorRef *) __attribute__((__swift_error__(nonnull_error)));
extern void *o2(CFErrorRef *) __attribute__((__swift_error__(null_result)));
extern void *o3(CFErrorRef *) __attribute__((__swift_error__(nonzero_result)));
// expected-error@-1 {{'__swift_error__' attribute with 'nonzero_result' convention can only be applied to a function returning an integral type}}
extern void *o4(CFErrorRef *) __attribute__((__swift_error__(zero_result)));
// expected-error@-1 {{'__swift_error__' attribute with 'zero_result' convention can only be applied to a function returning an integral type}}
extern void *p0(void) __attribute__((__swift_error__(none)));
extern void *p1(void) __attribute__((__swift_error__(nonnull_error)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a function with an error parameter}}
extern void *p2(void) __attribute__((__swift_error__(null_result)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a function with an error parameter}}
extern void *p3(void) __attribute__((__swift_error__(nonzero_result)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a function with an error parameter}}
extern void *p4(void) __attribute__((__swift_error__(zero_result)));
// expected-error@-1 {{'__swift_error__' attribute can only be applied to a function with an error parameter}}
extern BOOL b __attribute__((__swift_error__(none)));
// expected-error@-1 {{attribute only applies to functions and Objective-C methods}}