1// RUN: %clang_cc1 %s -verify
2// RUN: %clang_cc1 %s -DCODEGEN -emit-llvm -o - | FileCheck %s
3
4#define O_CREAT 0x100
5typedef int mode_t;
6typedef unsigned long size_t;
7
8int open(const char *pathname, int flags) __attribute__((enable_if(!(flags & O_CREAT), "must specify mode when using O_CREAT"))) __attribute__((overloadable));  // expected-note{{candidate disabled: must specify mode when using O_CREAT}}
9int open(const char *pathname, int flags, mode_t mode) __attribute__((overloadable));  // expected-note{{candidate function not viable: requires 3 arguments, but 2 were provided}}
10
11void test1() {
12#ifndef CODEGEN
13  open("path", O_CREAT);  // expected-error{{no matching function for call to 'open'}}
14#endif
15  open("path", O_CREAT, 0660);
16  open("path", 0);
17  open("path", 0, 0);
18}
19
20size_t __strnlen_chk(const char *s, size_t requested_amount, size_t s_len);
21
22size_t strnlen(const char *s, size_t maxlen)  // expected-note{{candidate function}}
23  __attribute__((overloadable))
24  __asm__("strnlen_real1");
25
26__attribute__((always_inline))
27inline size_t strnlen(const char *s, size_t maxlen)  // expected-note{{candidate function}}
28  __attribute__((overloadable))
29  __attribute__((enable_if(__builtin_object_size(s, 0) != -1,
30                           "chosen when target buffer size is known")))
31{
32  return __strnlen_chk(s, maxlen, __builtin_object_size(s, 0));
33}
34
35size_t strnlen(const char *s, size_t maxlen)  // expected-note{{candidate disabled: chosen when 'maxlen' is known to be less than or equal to the buffer size}}
36  __attribute__((overloadable))
37  __attribute__((enable_if(__builtin_object_size(s, 0) != -1,
38                           "chosen when target buffer size is known")))
39  __attribute__((enable_if(maxlen <= __builtin_object_size(s, 0),
40                           "chosen when 'maxlen' is known to be less than or equal to the buffer size")))
41  __asm__("strnlen_real2");
42
43size_t strnlen(const char *s, size_t maxlen)  // expected-note{{candidate function has been explicitly made unavailable}}
44  __attribute__((overloadable))
45  __attribute__((enable_if(__builtin_object_size(s, 0) != -1,
46                           "chosen when target buffer size is known")))
47  __attribute__((enable_if(maxlen > __builtin_object_size(s, 0),
48                           "chosen when 'maxlen' is larger than the buffer size")))
49  __attribute__((unavailable("'maxlen' is larger than the buffer size")));
50
51void test2(const char *s, int i) {
52// CHECK: define void @test2
53  const char c[123];
54  strnlen(s, i);
55// CHECK: call {{.*}}strnlen_real1
56  strnlen(s, 999);
57// CHECK: call {{.*}}strnlen_real1
58  strnlen(c, 1);
59// CHECK: call {{.*}}strnlen_real2
60  strnlen(c, i);
61// CHECK: call {{.*}}strnlen_chk
62#ifndef CODEGEN
63  strnlen(c, 999);  // expected-error{{call to unavailable function 'strnlen': 'maxlen' is larger than the buffer size}}
64#endif
65}
66
67int isdigit(int c) __attribute__((overloadable));  // expected-note{{candidate function}}
68int isdigit(int c) __attribute__((overloadable))  // expected-note{{candidate function has been explicitly made unavailable}}
69  __attribute__((enable_if(c <= -1 || c > 255, "'c' must have the value of an unsigned char or EOF")))
70  __attribute__((unavailable("'c' must have the value of an unsigned char or EOF")));
71
72void test3(int c) {
73  isdigit(c);
74  isdigit(10);
75#ifndef CODEGEN
76  isdigit(-10);  // expected-error{{call to unavailable function 'isdigit': 'c' must have the value of an unsigned char or EOF}}
77#endif
78}
79
80#ifndef CODEGEN
81__attribute__((enable_if(n == 0, "chosen when 'n' is zero"))) void f1(int n); // expected-error{{use of undeclared identifier 'n'}}
82
83int n __attribute__((enable_if(1, "always chosen"))); // expected-warning{{'enable_if' attribute only applies to functions}}
84
85void f(int n) __attribute__((enable_if("chosen when 'n' is zero", n == 0)));  // expected-error{{'enable_if' attribute requires a string}}
86
87void f(int n) __attribute__((enable_if()));  // expected-error{{'enable_if' attribute requires exactly 2 arguments}}
88
89void f(int n) __attribute__((enable_if(unresolvedid, "chosen when 'unresolvedid' is non-zero")));  // expected-error{{use of undeclared identifier 'unresolvedid'}}
90
91int global;
92void f(int n) __attribute__((enable_if(global == 0, "chosen when 'global' is zero")));  // expected-error{{'enable_if' attribute expression never produces a constant expression}}  // expected-note{{subexpression not valid in a constant expression}}
93
94const int cst = 7;
95void return_cst(void) __attribute__((overloadable)) __attribute__((enable_if(cst == 7, "chosen when 'cst' is 7")));
96void test_return_cst() { return_cst(); }
97#endif
98