llvm-project
66 строк · 2.8 Кб
1// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
2
3@interface X {}
4+ (X*) alloc;
5- (X*) init;
6- (int) getSize;
7- (void) setSize: (int) size;
8- (X*) getSelf;
9@end
10
11void f(X *noreturn) {
12// An array size which is computed by a message send is OK.
13int a[ [noreturn getSize] ]; // expected-warning {{variable length arrays in C++ are a Clang extension}}
14
15// ... but is interpreted as an attribute where possible.
16int b[ [noreturn] ]; // expected-error {{'noreturn' attribute only applies to functions}}
17
18int c[ [noreturn getSize] + 1 ]; // expected-warning {{variable length arrays in C++ are a Clang extension}}
19
20// An array size which is computed by a lambda is not OK.
21int d[ [noreturn] { return 3; } () ]; // expected-error {{expected ']'}} expected-error {{'noreturn' attribute only applies to functions}}
22
23// A message send which contains a message send is OK.
24[ [ X alloc ] init ];
25[ [ int(), noreturn getSelf ] getSize ]; // expected-warning {{left operand of comma operator has no effect}}
26
27// A message send which contains a lambda is OK.
28[ [noreturn] { return noreturn; } () setSize: 4 ];
29[ [bitand] { return noreturn; } () setSize: 5 ];
30[[[[] { return [ X alloc ]; } () init] getSelf] getSize];
31
32// An attribute is OK.
33[[]];
34[[int(), noreturn]]; // expected-warning {{unknown attribute 'int' ignored}} \
35// expected-error {{'noreturn' attribute cannot be applied to a statement}}
36[[class, test(foo 'x' bar),,,]]; // expected-warning {{unknown attribute 'test' ignored}}\
37// expected-warning {{unknown attribute 'class' ignored}}
38
39[[bitand, noreturn]]; // expected-error {{'noreturn' attribute cannot be applied to a statement}} \
40expected-warning {{unknown attribute 'bitand' ignored}}
41
42// FIXME: Suppress vexing parse warning
43[[gnu::noreturn]]int(e)(); // expected-warning {{function declaration}} expected-note {{replace parentheses with an initializer}}
44int e2(); // expected-warning {{interpreted as a function declaration}} expected-note{{}}
45
46// A function taking a noreturn function.
47int(f)([[gnu::noreturn]] int ()); // expected-note {{here}}
48f(e);
49f(e2); // expected-error {{cannot initialize a parameter of type 'int (*)() __attribute__((noreturn))' with an lvalue of type 'int ()'}}
50
51// Variables initialized by a message send.
52int(g)([[noreturn getSelf] getSize]);
53int(h)([[noreturn]{return noreturn;}() getSize]);
54
55int i = g + h;
56}
57
58template<typename...Ts> void f(Ts ...x) {
59[[test::foo(bar, baz)...]]; // expected-error {{attribute 'foo' cannot be used as an attribute pack}} \
60// expected-warning {{unknown attribute 'foo' ignored}}
61
62[[used(x)...]]; // expected-error {{attribute 'used' cannot be used as an attribute pack}} \
63// expected-warning {{unknown attribute 'used' ignored}}
64
65[[x...] { return [ X alloc ]; }() init];
66}
67