1 // RUN: %clang_cc1 -Wno-int-to-pointer-cast -pedantic -fsyntax-only %s -verify -fblocks
2 
3 typedef void (^CL)(void);
4 
foo()5 CL foo() {
6   short y;
7   short (^add1)(void) = ^{ return y+1; }; // expected-error {{incompatible block pointer types initializing 'short (^)(void)' with an expression of type 'int (^)(void)'}}
8 
9   CL X = ^{
10     if (2)
11       return;
12     return 1;  // expected-error {{return type 'int' must match previous return type 'void' when block literal has unspecified explicit return type}}
13   };
14 
15   int (^Y) (void)  = ^{
16     if (3)
17       return 1;
18     else
19       return; // expected-error {{return type 'void' must match previous return type 'int' when block literal has unspecified explicit return type}}
20   };
21 
22   char *(^Z)(void) = ^{
23     if (3)
24       return "";
25     else
26       return (char*)0;
27   };
28 
29   double (^A)(void) = ^ { // expected-error {{incompatible block pointer types initializing 'double (^)(void)' with an expression of type 'float (^)(void)'}}
30     if (1)
31       return (float)1.0;
32     else
33       if (2)
34         return (double)2.0; // expected-error {{return type 'double' must match previous return type 'float' when block literal has unspecified explicit return type}}
35     return 1; // expected-error {{return type 'int' must match previous return type 'float' when block literal has unspecified explicit return type}}
36   };
37   char *(^B)(void) = ^{
38     if (3)
39       return "";
40     else
41       return 2; // expected-error {{return type 'int' must match previous return type 'char *' when block literal has unspecified explicit return type}}
42   };
43 
44   return ^{ return 1; }; // expected-error {{incompatible block pointer types returning 'int (^)(void)' from a function with result type 'CL' (aka 'void (^)(void)')}}
45 }
46 
47 typedef int (^CL2)(void);
48 
foo2()49 CL2 foo2() {
50   return ^{ return 1; };
51 }
52 
53 typedef unsigned int * uintptr_t;
54 typedef char Boolean;
55 typedef int CFBasicHash;
56 
57 #define INVOKE_CALLBACK2(P, A, B) (P)(A, B)
58 
59 typedef struct {
60     Boolean (^isEqual)(const CFBasicHash *, uintptr_t stack_value_or_key1, uintptr_t stack_value_or_key2, Boolean is_key);
61 } CFBasicHashCallbacks;
62 
foo3()63 int foo3() {
64     CFBasicHashCallbacks cb;
65 
66     Boolean (*value_equal)(uintptr_t, uintptr_t) = 0;
67 
68     cb.isEqual = ^(const CFBasicHash *table, uintptr_t stack_value_or_key1, uintptr_t stack_value_or_key2, Boolean is_key) {
69       return (Boolean)(uintptr_t)INVOKE_CALLBACK2(value_equal, (uintptr_t)stack_value_or_key1, (uintptr_t)stack_value_or_key2);
70     };
71 }
72 
funk(char * s)73 static int funk(char *s) {
74   if (^{} == ((void*)0))
75     return 1;
76   else
77     return 0;
78 }
79 void next();
foo4()80 void foo4() {
81   int (^xx)(const char *s) = ^(char *s) { return 1; }; // expected-error {{incompatible block pointer types initializing 'int (^)(const char *)' with an expression of type 'int (^)(char *)'}}
82   int (*yy)(const char *s) = funk; // expected-warning {{incompatible pointer types initializing 'int (*)(const char *)' with an expression of type 'int (char *)'}}
83 
84   int (^nested)(char *s) = ^(char *str) { void (^nest)(void) = ^(void) { printf("%s\n", str); }; next(); return 1; }; // expected-warning{{implicitly declaring library function 'printf' with type 'int (const char *, ...)'}} \
85   // expected-note{{include the header <stdio.h> or explicitly provide a declaration for 'printf'}}
86 }
87 
88 typedef void (^bptr)(void);
89 
foo5(int j)90 bptr foo5(int j) {
91   __block int i;
92   if (j)
93     return ^{ ^{ i=0; }(); };  // expected-error {{returning block that lives on the local stack}}
94   return ^{ i=0; };  // expected-error {{returning block that lives on the local stack}}
95   return (^{ i=0; });  // expected-error {{returning block that lives on the local stack}}
96   return (void*)(^{ i=0; });  // expected-error {{returning block that lives on the local stack}}
97 }
98 
99 int (*funcptr3[5])(long);
100 int sz8 = sizeof(^int (*[5])(long) {return funcptr3;}); // expected-error {{block cannot return array type}} expected-warning {{incompatible pointer to integer conversion}}
101 int sz9 = sizeof(^int(*())()[3]{ }); // expected-error {{function cannot return array type}}
102 
foo6()103 void foo6() {
104   int (^b)(int) __attribute__((noreturn));
105   b = ^ (int i) __attribute__((noreturn)) { return 1; };  // expected-error {{block declared 'noreturn' should not return}}
106   b(1);
107   int (^c)(void) __attribute__((noreturn)) = ^ __attribute__((noreturn)) { return 100; }; // expected-error {{block declared 'noreturn' should not return}}
108 }
109 
110 
foo7()111 void foo7()
112 {
113  const int (^BB) (void) = ^{ const int i = 1; return i; }; // OK - initializing 'const int (^)(void)' with an expression of type 'int (^)(void)'
114 
115  const int (^CC) (void)  = ^const int{ const int i = 1; return i; };
116 
117 
118   int i;
119   int (^FF) (void)  = ^{ return i; }; // OK
120   int (^EE) (void)  = ^{ return i+1; }; // OK
121 
122   __block int j;
123   int (^JJ) (void)  = ^{ return j; }; // OK
124   int (^KK) (void)  = ^{ return j+1; }; // OK
125 
126   __block const int k;
127   const int cint = 100;
128 
129   int (^MM) (void)  = ^{ return k; };
130   int (^NN) (void)  = ^{ return cint; };
131 }
132 
133 // rdar://11069896
134 void (^blk)(void) = ^{
135     return (void)0; // expected-warning {{void block literal should not return void expression}}
136 };
137 
138 // rdar://13463504
139 enum Test8 { T8_a, T8_b, T8_c };
test8(void)140 void test8(void) {
141   extern void test8_helper(int (^)(int));
142   test8_helper(^(int flag) { if (flag) return T8_a; return T8_b; });
143 }
test8b(void)144 void test8b(void) {
145   extern void test8_helper2(char (^)(int)); // expected-note {{here}}
146   test8_helper2(^(int flag) { if (flag) return T8_a; return T8_b; }); // expected-error {{passing 'enum Test8 (^)(int)' to parameter of type 'char (^)(int)'}}
147 }
148