134 lines · c
1// RUN: %clang_cc1 -triple x86_64-linux-gnu -DALIGN_BUILTIN=__builtin_align_down -DRETURNS_BOOL=0 %s -fsyntax-only -verify -Wpedantic2// RUN: %clang_cc1 -triple x86_64-linux-gnu -DALIGN_BUILTIN=__builtin_align_up -DRETURNS_BOOL=0 %s -fsyntax-only -verify -Wpedantic3// RUN: %clang_cc1 -triple x86_64-linux-gnu -DALIGN_BUILTIN=__builtin_is_aligned -DRETURNS_BOOL=1 %s -fsyntax-only -verify -Wpedantic4 5struct Aggregate {6 int i;7 int j;8};9enum Enum { EnumValue1,10 EnumValue2 };11typedef __SIZE_TYPE__ size_t;12 13void test_parameter_types(char *ptr, size_t size) {14 struct Aggregate agg;15 enum Enum e = EnumValue2;16 _Bool b = 0;17 18 // The first parameter can be any pointer or integer type:19 (void)ALIGN_BUILTIN(ptr, 4);20 (void)ALIGN_BUILTIN(size, 2);21 (void)ALIGN_BUILTIN(12345, 2);22 (void)ALIGN_BUILTIN(agg, 2); // expected-error {{operand of type 'struct Aggregate' where arithmetic or pointer type is required}}23 (void)ALIGN_BUILTIN(e, 2); // expected-error {{operand of type 'enum Enum' where arithmetic or pointer type is required}}24 (void)ALIGN_BUILTIN(b, 2); // expected-error {{operand of type '_Bool' where arithmetic or pointer type is required}}25 (void)ALIGN_BUILTIN((int)e, 2); // but with a cast it is fine26 (void)ALIGN_BUILTIN((int)b, 2); // but with a cast it is fine27 28 // The second parameter must be an integer type (but not enum or _Bool):29 (void)ALIGN_BUILTIN(ptr, size);30 (void)ALIGN_BUILTIN(ptr, ptr); // expected-error {{used type 'char *' where integer is required}}31 (void)ALIGN_BUILTIN(ptr, agg); // expected-error {{used type 'struct Aggregate' where integer is required}}32 (void)ALIGN_BUILTIN(ptr, b); // expected-error {{used type '_Bool' where integer is required}}33 (void)ALIGN_BUILTIN(ptr, e); // expected-error {{used type 'enum Enum' where integer is required}}34 (void)ALIGN_BUILTIN(ptr, (int)e); // but with a cast enums are fine35 (void)ALIGN_BUILTIN(ptr, (int)b); // but with a cast booleans are fine36 37 (void)ALIGN_BUILTIN(ptr, size);38 (void)ALIGN_BUILTIN(size, size);39}40 41void test_result_unused(int i, int align) {42 // -Wunused-result does not trigger for macros so we can't use ALIGN_BUILTIN()43 // but need to explicitly call each function.44 __builtin_align_up(i, align); // expected-warning{{ignoring return value of function declared with const attribute}}45 __builtin_align_down(i, align); // expected-warning{{ignoring return value of function declared with const attribute}}46 __builtin_is_aligned(i, align); // expected-warning{{ignoring return value of function declared with const attribute}}47 ALIGN_BUILTIN(i, align); // no warning here48}49 50#define check_same_type(type1, type2) __builtin_types_compatible_p(type1, type2) && __builtin_types_compatible_p(type1 *, type2 *)51 52void test_return_type(void *ptr, int i, long l) {53 char array[32];54 __extension__ typedef typeof(ALIGN_BUILTIN(ptr, 4)) result_type_ptr;55 __extension__ typedef typeof(ALIGN_BUILTIN(i, 4)) result_type_int;56 __extension__ typedef typeof(ALIGN_BUILTIN(l, 4)) result_type_long;57 __extension__ typedef typeof(ALIGN_BUILTIN(array, 4)) result_type_char_array;58#if RETURNS_BOOL59 _Static_assert(check_same_type(_Bool, result_type_ptr), "Should return bool");60 _Static_assert(check_same_type(_Bool, result_type_int), "Should return bool");61 _Static_assert(check_same_type(_Bool, result_type_long), "Should return bool");62 _Static_assert(check_same_type(_Bool, result_type_char_array), "Should return bool");63#else64 _Static_assert(check_same_type(void *, result_type_ptr), "Should return void*");65 _Static_assert(check_same_type(int, result_type_int), "Should return int");66 _Static_assert(check_same_type(long, result_type_long), "Should return long");67 // Check that we can use the alignment builtins on array types (result should decay)68 _Static_assert(check_same_type(char *, result_type_char_array),69 "Using the builtins on an array should yield the decayed type");70#endif71}72 73void test_invalid_alignment_values(char *ptr, long *longptr, size_t align) {74 int x = 1;75 (void)ALIGN_BUILTIN(ptr, 2);76 (void)ALIGN_BUILTIN(longptr, 1024);77 (void)ALIGN_BUILTIN(x, 32);78 79 (void)ALIGN_BUILTIN(ptr, 0); // expected-error {{requested alignment must be 1 or greater}}80 (void)ALIGN_BUILTIN(ptr, 1);81#if RETURNS_BOOL82 // expected-warning@-2 {{checking whether a value is aligned to 1 byte is always true}}83#else84 // expected-warning@-4 {{aligning a value to 1 byte is a no-op}}85#endif86 (void)ALIGN_BUILTIN(ptr, 3); // expected-error {{requested alignment is not a power of 2}}87 (void)ALIGN_BUILTIN(x, 7); // expected-error {{requested alignment is not a power of 2}}88 89 // check the maximum range for smaller types:90 __UINT8_TYPE__ c = ' ';91 92 (void)ALIGN_BUILTIN(c, 128); // this is fine93 (void)ALIGN_BUILTIN(c, 256); // expected-error {{requested alignment must be 128 or smaller}}94 (void)ALIGN_BUILTIN(x, 1ULL << 31); // this is also fine95 (void)ALIGN_BUILTIN(x, 1LL << 31); // this is also fine96 __INT32_TYPE__ i32 = 3;97 __UINT32_TYPE__ u32 = 3;98 // Maximum is the same for int32 and uint3299 (void)ALIGN_BUILTIN(i32, 1ULL << 32); // expected-error {{requested alignment must be 2147483648 or smaller}}100 (void)ALIGN_BUILTIN(u32, 1ULL << 32); // expected-error {{requested alignment must be 2147483648 or smaller}}101 (void)ALIGN_BUILTIN(ptr, ((__int128)1) << 65); // expected-error {{requested alignment must be 9223372036854775808 or smaller}}102 (void)ALIGN_BUILTIN(longptr, ((__int128)1) << 65); // expected-error {{requested alignment must be 9223372036854775808 or smaller}}103 104 const int bad_align = 8 + 1;105 (void)ALIGN_BUILTIN(ptr, bad_align); // expected-error {{requested alignment is not a power of 2}}106}107 108// Check that it can be used in constant expressions:109void constant_expression(int x) {110 _Static_assert(__builtin_is_aligned(1024, 512), "");111 _Static_assert(!__builtin_is_aligned(256, 512ULL), "");112 _Static_assert(__builtin_align_up(33, 32) == 64, "");113 _Static_assert(__builtin_align_down(33, 32) == 32, "");114 115 // But not if one of the arguments isn't constant:116 _Static_assert(ALIGN_BUILTIN(33, x) != 100, ""); // expected-error {{static assertion expression is not an integral constant expression}}117 _Static_assert(ALIGN_BUILTIN(x, 4) != 100, ""); // expected-error {{static assertion expression is not an integral constant expression}}118}119 120// Check that it is a constant expression that can be assigned to globals:121int global1 = __builtin_align_down(33, 8);122int global2 = __builtin_align_up(33, 8);123_Bool global3 = __builtin_is_aligned(33, 8);124 125extern void test_ptr(char *c);126char *test_array_and_fnptr(void) {127 char buf[1024];128 // The builtins should also work on arrays (decaying the return type)129 (void)(ALIGN_BUILTIN(buf, 16));130 // But not on functions and function pointers:131 (void)(ALIGN_BUILTIN(test_array_and_fnptr, 16)); // expected-error{{operand of type 'char *(void)' where arithmetic or pointer type is required}}132 (void)(ALIGN_BUILTIN(&test_array_and_fnptr, 16)); // expected-error{{operand of type 'char *(*)(void)' where arithmetic or pointer type is required}}133}134