block-literal.c revision 04831aa3271edc5f00a651bf7152c2902981d7c3 
1// RUN: clang -fsyntax-only %s -verify -fblocks
2
3void I( void (^)(void));
4void (^noop)(void);
5
6void nothing();
7int printf(const char*, ...);
8
9typedef void (^T) (void);
10
11void takeclosure(T);
12int takeintint(int (^C)(int)) { return C(4); }
13
14T somefunction() {
15	if (^{ })
16	  nothing();
17
18	noop = ^{};
19
20	noop = ^{printf("\nClosure\n"); };
21
22	I(^{ });
23
24	return ^{printf("\nClosure\n"); };  // expected-error {{returning block that lives on the local stack}}
25}
26void test2() {
27	int x = 4;
28
29	takeclosure(^{ printf("%d\n", x); });
30
31  while (1) {
32	  takeclosure(^{
33      break;  // expected-error {{'break' statement not in loop or switch statement}}
34	    continue; // expected-error {{'continue' statement not in loop statement}}
35	    while(1) break;  // ok
36      goto foo; // expected-error {{goto not allowed}}
37    });
38    break;
39	}
40
41foo:
42	takeclosure(^{ x = 4; });  // expected-error {{variable is not assignable (missing __block type specifier)}}
43  __block y = 7; // expected-warning {{type specifier missing, defaults to 'int'}}
44  takeclosure(^{ y = 8; });
45}
46
47
48void (^test3())(void) {
49  return ^{};   // expected-error {{returning block that lives on the local stack}}
50}
51
52void test4() {
53  void (^noop)(void) = ^{};
54  void (*noop2)() = 0;
55}
56
57void myfunc(int (^block)(int)) {}
58
59void myfunc3(const int *x);
60
61void test5() {
62    int a;
63
64    myfunc(^(int abcd) {
65        myfunc3(&a);
66        return 1;
67    });
68}
69
70void *X;
71
72void test_arguments() {
73  int y;
74  int (^c)(char);
75  (1 ? c : 0)('x');
76  (1 ? 0 : c)('x');
77
78  (1 ? c : c)('x');
79}
80
81static int global_x = 10;
82void (^global_block)(void) = ^{ printf("global x is %d\n", global_x); };
83
84#if 0
85// Old syntax. FIXME: convert/test.
86void test_byref() {
87  int i;
88
89  X = ^{| g |};  // error {{use of undeclared identifier 'g'}}
90
91  X = ^{| i,i,i | };
92
93  X = ^{|i| i = 0; };
94
95}
96
97// TODO: global closures someday.
98void *A = ^{};
99void *B = ^(int){ A = 0; };
100
101
102// Closures can not take return types at this point.
103void test_retvals() {
104  // Explicit return value.
105  ^int{};   // error {{closure with explicit return type requires argument list}}
106  X = ^void(){};
107
108  // Optional specification of return type.
109  X = ^char{ return 'x'; };  // error {{closure with explicit return type requires argument list}}
110
111  X = ^/*missing declspec*/ *() { return (void*)0; };
112  X = ^void*() { return (void*)0; };
113
114  //X = ^char(short c){ if (c) return c; else return (int)4; };
115
116}
117
118#endif
119