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llvm-project/clang/test/Sema/compare.c

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// RUN: %clang_cc1 -triple x86_64-apple-darwin -fsyntax-only -pedantic -verify -Wsign-compare -Wtautological-constant-in-range-compare %s -Wno-unreachable-code
// RUN: %clang_cc1 -triple x86_64-apple-darwin -fsyntax-only -pedantic -verify -Wsign-compare -Wtype-limits %s -Wno-unreachable-code
int test(char *C) { // nothing here should warn.
return C != ((void*)0);
return C != (void*)0;
return C != 0;
return C != 1; // expected-warning {{comparison between pointer and integer ('char *' and 'int')}}
}
int ints(long a, unsigned long b) {
enum EnumA {A};
enum EnumB {B};
enum EnumC {C = 0x10000};
return
// (a,b)
(a == (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
(a == (unsigned int) b) +
(a == (unsigned short) b) +
(a == (unsigned char) b) +
((long) a == b) + // expected-warning {{comparison of integers of different signs}}
((int) a == b) + // expected-warning {{comparison of integers of different signs}}
((short) a == b) + // expected-warning {{comparison of integers of different signs}}
((signed char) a == b) + // expected-warning {{comparison of integers of different signs}}
((long) a == (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
((int) a == (unsigned int) b) + // expected-warning {{comparison of integers of different signs}}
((short) a == (unsigned short) b) +
((signed char) a == (unsigned char) b) +
(a < (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
(a < (unsigned int) b) +
(a < (unsigned short) b) +
(a < (unsigned char) b) +
((long) a < b) + // expected-warning {{comparison of integers of different signs}}
((int) a < b) + // expected-warning {{comparison of integers of different signs}}
((short) a < b) + // expected-warning {{comparison of integers of different signs}}
((signed char) a < b) + // expected-warning {{comparison of integers of different signs}}
((long) a < (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
((int) a < (unsigned int) b) + // expected-warning {{comparison of integers of different signs}}
((short) a < (unsigned short) b) +
((signed char) a < (unsigned char) b) +
// (A,b)
(A == (unsigned long) b) +
(A == (unsigned int) b) +
(A == (unsigned short) b) +
(A == (unsigned char) b) +
((long) A == b) +
((int) A == b) +
((short) A == b) +
((signed char) A == b) +
((long) A == (unsigned long) b) +
((int) A == (unsigned int) b) +
((short) A == (unsigned short) b) +
((signed char) A == (unsigned char) b) +
(A < (unsigned long) b) +
(A < (unsigned int) b) +
(A < (unsigned short) b) +
(A < (unsigned char) b) +
((long) A < b) +
((int) A < b) +
((short) A < b) +
((signed char) A < b) +
((long) A < (unsigned long) b) +
((int) A < (unsigned int) b) +
((short) A < (unsigned short) b) +
((signed char) A < (unsigned char) b) +
// (a,B)
(a == (unsigned long) B) +
(a == (unsigned int) B) +
(a == (unsigned short) B) +
(a == (unsigned char) B) +
((long) a == B) +
((int) a == B) +
((short) a == B) +
((signed char) a == B) +
((long) a == (unsigned long) B) +
((int) a == (unsigned int) B) +
((short) a == (unsigned short) B) +
((signed char) a == (unsigned char) B) +
(a < (unsigned long) B) + // expected-warning {{comparison of unsigned expression < 0 is always false}}
(a < (unsigned int) B) +
(a < (unsigned short) B) +
(a < (unsigned char) B) +
((long) a < B) +
((int) a < B) +
((short) a < B) +
((signed char) a < B) +
((long) a < (unsigned long) B) + // expected-warning {{comparison of unsigned expression < 0 is always false}}
((int) a < (unsigned int) B) + // expected-warning {{comparison of unsigned expression < 0 is always false}}
((short) a < (unsigned short) B) +
((signed char) a < (unsigned char) B) +
// (C,b)
(C == (unsigned long) b) +
(C == (unsigned int) b) +
(C == (unsigned short) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned short' is always false}}
(C == (unsigned char) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned char' is always false}}
((long) C == b) +
((int) C == b) +
((short) C == b) +
((signed char) C == b) +
((long) C == (unsigned long) b) +
((int) C == (unsigned int) b) +
((short) C == (unsigned short) b) +
((signed char) C == (unsigned char) b) +
(C < (unsigned long) b) +
(C < (unsigned int) b) +
(C < (unsigned short) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned short' is always false}}
(C < (unsigned char) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned char' is always false}}
((long) C < b) +
((int) C < b) +
((short) C < b) +
((signed char) C < b) +
((long) C < (unsigned long) b) +
((int) C < (unsigned int) b) +
((short) C < (unsigned short) b) +
((signed char) C < (unsigned char) b) +
// (a,C)
(a == (unsigned long) C) +
(a == (unsigned int) C) +
(a == (unsigned short) C) +
(a == (unsigned char) C) +
((long) a == C) +
((int) a == C) +
((short) a == C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'short' is always false}}
((signed char) a == C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'signed char' is always false}}
((long) a == (unsigned long) C) +
((int) a == (unsigned int) C) +
((short) a == (unsigned short) C) +
((signed char) a == (unsigned char) C) +
(a < (unsigned long) C) + // expected-warning {{comparison of integers of different signs}}
(a < (unsigned int) C) +
(a < (unsigned short) C) +
(a < (unsigned char) C) +
((long) a < C) +
((int) a < C) +
((short) a < C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'short' is always true}}
((signed char) a < C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'signed char' is always true}}
((long) a < (unsigned long) C) + // expected-warning {{comparison of integers of different signs}}
((int) a < (unsigned int) C) + // expected-warning {{comparison of integers of different signs}}
((short) a < (unsigned short) C) +
((signed char) a < (unsigned char) C) +
// (0x80000,b)
(0x80000 == (unsigned long) b) +
(0x80000 == (unsigned int) b) +
(0x80000 == (unsigned short) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned short' is always false}}
(0x80000 == (unsigned char) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned char' is always false}}
((long) 0x80000 == b) +
((int) 0x80000 == b) +
((short) 0x80000 == b) +
((signed char) 0x80000 == b) +
((long) 0x80000 == (unsigned long) b) +
((int) 0x80000 == (unsigned int) b) +
((short) 0x80000 == (unsigned short) b) +
((signed char) 0x80000 == (unsigned char) b) +
(0x80000 < (unsigned long) b) +
(0x80000 < (unsigned int) b) +
(0x80000 < (unsigned short) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned short' is always false}}
(0x80000 < (unsigned char) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned char' is always false}}
((long) 0x80000 < b) +
((int) 0x80000 < b) +
((short) 0x80000 < b) +
((signed char) 0x80000 < b) +
((long) 0x80000 < (unsigned long) b) +
((int) 0x80000 < (unsigned int) b) +
((short) 0x80000 < (unsigned short) b) +
((signed char) 0x80000 < (unsigned char) b) +
// (a,0x80000)
(a == (unsigned long) 0x80000) +
(a == (unsigned int) 0x80000) +
(a == (unsigned short) 0x80000) +
(a == (unsigned char) 0x80000) +
((long) a == 0x80000) +
((int) a == 0x80000) +
((short) a == 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'short' is always false}}
((signed char) a == 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'signed char' is always false}}
((long) a == (unsigned long) 0x80000) +
((int) a == (unsigned int) 0x80000) +
((short) a == (unsigned short) 0x80000) +
((signed char) a == (unsigned char) 0x80000) +
(a < (unsigned long) 0x80000) + // expected-warning {{comparison of integers of different signs}}
(a < (unsigned int) 0x80000) +
(a < (unsigned short) 0x80000) +
(a < (unsigned char) 0x80000) +
((long) a < 0x80000) +
((int) a < 0x80000) +
((short) a < 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'short' is always true}}
((signed char) a < 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'signed char' is always true}}
((long) a < (unsigned long) 0x80000) + // expected-warning {{comparison of integers of different signs}}
((int) a < (unsigned int) 0x80000) + // expected-warning {{comparison of integers of different signs}}
((short) a < (unsigned short) 0x80000) +
((signed char) a < (unsigned char) 0x80000) +
// We should be able to avoid warning about this.
(b != (a < 4 ? 1 : 2)) +
10
;
}
int equal(char *a, const char *b) {
return a == b;
}
int arrays(char (*a)[5], char(*b)[10], char(*c)[5]) {
int d = (a == c);
return a == b; // expected-warning {{comparison of distinct pointer types}}
}
int pointers(int *a) {
return a > 0; // expected-warning {{ordered comparison between pointer and zero ('int *' and 'int') is an extension}}
return a > 42; // expected-warning {{ordered comparison between pointer and integer ('int *' and 'int')}}
return a > (void *)0; // expected-warning {{comparison of distinct pointer types}}
}
int function_pointers(int (*a)(int), int (*b)(int), void (*c)(int)) {
return a > b; // expected-warning {{ordered comparison of function pointers}}
return function_pointers > function_pointers; // expected-warning {{self-comparison always evaluates to false}} expected-warning{{ordered comparison of function pointers}}
return a > c; // expected-warning {{comparison of distinct pointer types}}
return a == (void *) 0;
return a == (void *) 1; // expected-warning {{equality comparison between function pointer and void pointer}}
}
int void_pointers(void* foo) {
return foo == (void*) 0;
return foo == (void*) 1;
}
int test1(int i) {
enum en { zero };
return i > zero;
}
// PR5937
int test2(int i32) {
struct foo {
unsigned int u8 : 8;
unsigned long long u31 : 31;
unsigned long long u32 : 32;
unsigned long long u63 : 63;
unsigned long long u64 : 64;
} *x;
if (x->u8 == i32) { // comparison in int32, exact
return 0;
} else if (x->u31 == i32) { // comparison in int32, exact
return 1;
} else if (x->u32 == i32) { // expected-warning {{comparison of integers of different signs}}
return 2;
} else if (x->u63 == i32) { // comparison in uint64, exact because ==
return 3;
} else if (x->u64 == i32) { // expected-warning {{comparison of integers of different signs}}
return 4;
} else {
return 5;
}
}
// PR5887
void test3() {
unsigned short x, y;
unsigned int z;
if ((x > y ? x : y) > z)
(void) 0;
}
// PR5961
extern char *ptr4;
void test4() {
long value;
if (value < (unsigned long) &ptr4) // expected-warning {{comparison of integers of different signs}}
return;
}
// PR4807
int test5(unsigned int x) {
return (x < 0) // expected-warning {{comparison of unsigned expression < 0 is always false}}
&& (0 > x) // expected-warning {{comparison of 0 > unsigned expression is always false}}
&& (x >= 0) // expected-warning {{comparison of unsigned expression >= 0 is always true}}
&& (0 <= x); // expected-warning {{comparison of 0 <= unsigned expression is always true}}
}
struct bitfield {
int a : 3;
unsigned b : 3;
long c : 40;
unsigned long d : 40;
};
void test5a(struct bitfield a) {
if (a.a < 0) {}
if (a.b < 0) {} // expected-warning {{comparison of unsigned expression < 0 is always false}}
if (a.c < 0) {}
if (a.d < 0) {} // expected-warning {{comparison of unsigned expression < 0 is always false}}
}
int test6(unsigned i, unsigned power) {
unsigned x = (i < (1 << power) ? i : 0);
return x != 3 ? 1 << power : i;
}
// <rdar://problem/8414119> enum >= (enum)0 comparison should not generate any warnings
enum rdar8414119_Vals { X, Y, Z };
#define ZERO 0
#define CHECK(x) (x >= X)
void rdar8414119_foo(enum rdar8414119_Vals v) {
if (CHECK(v)) // no-warning
return;
if (v >= X) // no-warning
return;
}
int rdar8414119_bar(unsigned x) {
return x >= ZERO; // no-warning
}
#undef ZERO
#undef CHECK
int rdar8511238() {
enum A { A_foo, A_bar };
enum A a;
if (a == 0)
return 0;
if (a != 0)
return 0;
if (a < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}}
return 0;
if (a <= 0)
return 0;
if (a > 0)
return 0;
if (a >= 0) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}}
return 0;
if (0 == a)
return 0;
if (0 != a)
return 0;
if (0 < a)
return 0;
if (0 <= a) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}}
return 0;
if (0 > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}}
return 0;
if (0 >= a)
return 0;
if (a == 0U)
return 0;
if (a != 0U)
return 0;
if (a < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}}
return 0;
if (a <= 0U)
return 0;
if (a > 0U)
return 0;
if (a >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}}
return 0;
if (0U == a)
return 0;
if (0U != a)
return 0;
if (0U < a)
return 0;
if (0U <= a) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}}
return 0;
if (0U > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}}
return 0;
if (0U >= a)
return 0;
return 20;
}
// PR10336
int test9(int sv, unsigned uv, long slv) {
return sv == (uv ^= slv); // expected-warning {{comparison of integers of different signs: 'int' and 'unsigned int'}}
}
void test10(void) {
int si;
unsigned int ui;
long sl;
_Bool b;
b = (si == (ui = sl)); // expected-warning {{comparison of integers of different signs: 'int' and 'unsigned int'}}
b = (si == (ui = sl&15));
}
// PR11572
struct test11S { unsigned x : 30; };
int test11(unsigned y, struct test11S *p) {
return y > (p->x >> 24); // no-warning
}
typedef char one_char[1];
typedef char two_chars[2];
void test12(unsigned a) {
if (0 && -1 > a) { }
}
// PR36008
enum PR36008EnumTest {
kPR36008Value = 0,
};
void pr36008(enum PR36008EnumTest lhs) {
__typeof__(lhs) x = lhs;
__typeof__(kPR36008Value) y = (kPR36008Value);
if (x == y) x = y; // no warning
if (y == x) y = x; // no warning
}
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