builtins.c revision 1cb2d742eb6635aeab6132ee5f0b5781d39487d7 
1// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wno-string-plus-int -triple=i686-apple-darwin9
2// This test needs to set the target because it uses __builtin_ia32_vec_ext_v4si
3
4int test1(float a, int b) {
5  return __builtin_isless(a, b);
6}
7int test2(int a, int b) {
8  return __builtin_islessequal(a, b);  // expected-error {{floating point type}}
9}
10
11int test3(double a, float b) {
12  return __builtin_isless(a, b);
13}
14int test4(int* a, double b) {
15  return __builtin_islessequal(a, b);  // expected-error {{floating point type}}
16}
17
18int test5(float a, long double b) {
19  return __builtin_isless(a, b, b);  // expected-error {{too many arguments}}
20}
21int test6(float a, long double b) {
22  return __builtin_islessequal(a);  // expected-error {{too few arguments}}
23}
24
25
26#define CFSTR __builtin___CFStringMakeConstantString
27void test7() {
28  const void *X;
29  X = CFSTR("\242"); // expected-warning {{input conversion stopped}}
30  X = CFSTR("\0"); // no-warning
31  X = CFSTR(242); // expected-error {{CFString literal is not a string constant}} expected-warning {{incompatible integer to pointer conversion}}
32  X = CFSTR("foo", "bar"); // expected-error {{too many arguments to function call}}
33}
34
35
36// atomics.
37
38void test9(short v) {
39  unsigned i, old;
40
41  old = __sync_fetch_and_add();  // expected-error {{too few arguments to function call}}
42  old = __sync_fetch_and_add(&old);  // expected-error {{too few arguments to function call}}
43  old = __sync_fetch_and_add((unsigned*)0, 42i); // expected-warning {{imaginary constants are an extension}}
44
45  // PR7600: Pointers are implicitly casted to integers and back.
46  void *old_ptr = __sync_val_compare_and_swap((void**)0, 0, 0);
47
48  // Ensure the return type is correct even when implicit casts are stripped
49  // away. This triggers an assertion while checking the comparison otherwise.
50  if (__sync_fetch_and_add(&old, 1) == 1) {
51  }
52}
53
54
55// rdar://7236819
56void test10(void) __attribute__((noreturn));
57
58void test10(void) {
59  __asm__("int3");
60  __builtin_unreachable();
61
62  // No warning about falling off the end of a noreturn function.
63}
64
65void test11(int X) {
66  switch (X) {
67  case __builtin_eh_return_data_regno(0):  // constant foldable.
68    break;
69  }
70
71  __builtin_eh_return_data_regno(X);  // expected-error {{argument to '__builtin_eh_return_data_regno' must be a constant integer}}
72}
73
74// PR5062
75void test12(void) __attribute__((__noreturn__));
76void test12(void) {
77  __builtin_trap();  // no warning because trap is noreturn.
78}
79
80void test_unknown_builtin(int a, int b) {
81  __builtin_isles(a, b); // expected-error{{use of unknown builtin}} \
82                         // expected-note{{did you mean '__builtin_isless'?}}
83}
84
85int test13() {
86  __builtin_eh_return(0, 0); // no warning, eh_return never returns.
87}
88
89// <rdar://problem/8228293>
90void test14() {
91  int old;
92  old = __sync_fetch_and_min((volatile int *)&old, 1);
93}
94
95// <rdar://problem/8336581>
96void test15(const char *s) {
97  __builtin_printf("string is %s\n", s);
98}
99
100// PR7885
101int test16() {
102  return __builtin_constant_p() + // expected-error{{too few arguments}}
103         __builtin_constant_p(1, 2); // expected-error {{too many arguments}}
104}
105
106const int test17_n = 0;
107const char test17_c[] = {1, 2, 3, 0};
108const char test17_d[] = {1, 2, 3, 4};
109typedef int __attribute__((vector_size(16))) IntVector;
110struct Aggregate { int n; char c; };
111enum Enum { EnumValue1, EnumValue2 };
112
113typedef __typeof(sizeof(int)) size_t;
114size_t strlen(const char *);
115
116void test17() {
117#define ASSERT(...) { int arr[(__VA_ARGS__) ? 1 : -1]; }
118#define T(...) ASSERT(__builtin_constant_p(__VA_ARGS__))
119#define F(...) ASSERT(!__builtin_constant_p(__VA_ARGS__))
120
121  // __builtin_constant_p returns 1 if the argument folds to:
122  //  - an arithmetic constant with value which is known at compile time
123  T(test17_n);
124  T(&test17_c[3] - test17_c);
125  T(3i + 5); // expected-warning {{imaginary constant}}
126  T(4.2 * 7.6);
127  T(EnumValue1);
128  T((enum Enum)(int)EnumValue2);
129
130  //  - the address of the first character of a string literal, losslessly cast
131  //    to any type
132  T("string literal");
133  T((double*)"string literal");
134  T("string literal" + 0);
135  T((long)"string literal");
136
137  // ... and otherwise returns 0.
138  F("string literal" + 1);
139  F(&test17_n);
140  F(test17_c);
141  F(&test17_c);
142  F(&test17_d);
143  F((struct Aggregate){0, 1});
144  F((IntVector){0, 1, 2, 3});
145
146  // Ensure that a technique used in glibc is handled correctly.
147#define OPT(...) (__builtin_constant_p(__VA_ARGS__) && strlen(__VA_ARGS__) < 4)
148  // FIXME: These are incorrectly treated as ICEs because strlen is treated as
149  // a builtin.
150  ASSERT(OPT("abc"));
151  ASSERT(!OPT("abcd"));
152  // In these cases, the strlen is non-constant, but the __builtin_constant_p
153  // is 0: the array size is not an ICE but is foldable.
154  ASSERT(!OPT(test17_c));        // expected-warning {{folded}}
155  ASSERT(!OPT(&test17_c[0]));    // expected-warning {{folded}}
156  ASSERT(!OPT((char*)test17_c)); // expected-warning {{folded}}
157  ASSERT(!OPT(test17_d));        // expected-warning {{folded}}
158  ASSERT(!OPT(&test17_d[0]));    // expected-warning {{folded}}
159  ASSERT(!OPT((char*)test17_d)); // expected-warning {{folded}}
160
161#undef OPT
162#undef T
163#undef F
164}
165