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clang-p2996/clang/test/Sema/integer-overflow.c
Bill Wendling b76219b590 [clang][Sema] Use correct array size for diagnostic 
The diagnostic was confusing and reporting that an array contains far
more elements than it is defined to have, due to casting.

For example, this code:

  double foo[4096];
  ((char*)foo)[sizeof(foo)];

warns that the "index 32768 is past the end of the array (which contains
32768 elements)."

Reviewed By: serge-sans-paille, aaron.ballman

Differential Revision: https://reviews.llvm.org/D135920
2022-10-20 11:56:49 -07:00

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// RUN: %clang_cc1 %s -verify -fsyntax-only -triple x86_64-pc-linux-gnu
typedef unsigned long long uint64_t;
typedef unsigned int uint32_t;
// Check integer sizes.
int array64[sizeof(uint64_t) == 8 ? 1 : -1];
int array32[sizeof(uint32_t) == 4 ? 1 : -1];
int arrayint[sizeof(int) < sizeof(uint64_t) ? 1 : -1];
uint64_t f0(uint64_t);
uint64_t f1(uint64_t, uint32_t);
uint64_t f2(uint64_t, ...);
static const uint64_t overflow = 1 * 4608 * 1024 * 1024; // expected-warning {{overflow in expression; result is 536870912 with type 'int'}}
uint64_t check_integer_overflows(int i) {
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
uint64_t overflow = 4608 * 1024 * 1024,
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
overflow2 = (uint64_t)(4608 * 1024 * 1024),
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
overflow3 = (uint64_t)(4608 * 1024 * 1024 * i),
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
overflow4 = (1ULL * ((4608) * ((1024) * (1024))) + 2ULL),
// expected-warning@+1 2{{overflow in expression; result is 536870912 with type 'int'}}
multi_overflow = (uint64_t)((uint64_t)(4608 * 1024 * 1024) * (uint64_t)(4608 * 1024 * 1024));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
overflow += overflow2 = overflow3 = (uint64_t)(4608 * 1024 * 1024);
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
overflow += overflow2 = overflow3 = 4608 * 1024 * 1024;
uint64_t not_overflow = 4608 * 1024 * 1024ULL;
uint64_t not_overflow2 = (1ULL * ((uint64_t)(4608) * (1024 * 1024)) + 2ULL);
// expected-warning@+1 2{{overflow in expression; result is 536870912 with type 'int'}}
overflow = 4608 * 1024 * 1024 ? 4608 * 1024 * 1024 : 0;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
overflow = 0 ? 0 : 4608 * 1024 * 1024;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
if (4608 * 1024 * 1024)
return 0;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
if ((uint64_t)(4608 * 1024 * 1024))
return 1;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
if ((uint64_t)(4608 * 1024 * 1024))
return 2;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
if ((uint64_t)(4608 * 1024 * 1024 * i))
return 3;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
if ((1ULL * ((4608) * ((1024) * (1024))) + 2ULL))
return 4;
// expected-warning@+1 2{{overflow in expression; result is 536870912 with type 'int'}}
if ((uint64_t)((uint64_t)(4608 * 1024 * 1024) * (uint64_t)(4608 * 1024 * 1024)))
return 5;
switch (i) {
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
case 4608 * 1024 * 1024:
return 6;
// expected-warning@+1 {{overflow in expression; result is 537919488 with type 'int'}}
case (uint64_t)(4609 * 1024 * 1024):
return 7;
// expected-error@+1 {{expression is not an integer constant expression}}
case ((uint64_t)(4608 * 1024 * 1024 * i)):
return 8;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
case ((1ULL * ((4608) * ((1024) * (1024))) + 2ULL)):
return 9;
// expected-warning@+2 2{{overflow in expression; result is 536870912 with type 'int'}}
// expected-warning@+1 {{overflow converting case value to switch condition type (288230376151711744 to 0)}}
case ((uint64_t)((uint64_t)(4608 * 1024 * 1024) * (uint64_t)(4608 * 1024 * 1024))):
return 10;
}
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
while (4608 * 1024 * 1024);
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
while ((uint64_t)(4608 * 1024 * 1024));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
while ((uint64_t)(4608 * 1024 * 1024));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
while ((uint64_t)(4608 * 1024 * 1024 * i));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
while ((1ULL * ((4608) * ((1024) * (1024))) + 2ULL));
// expected-warning@+1 2{{overflow in expression; result is 536870912 with type 'int'}}
while ((uint64_t)((uint64_t)(4608 * 1024 * 1024) * (uint64_t)(4608 * 1024 * 1024)));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
do { } while (4608 * 1024 * 1024);
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
do { } while ((uint64_t)(4608 * 1024 * 1024));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
do { } while ((uint64_t)(4608 * 1024 * 1024));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
do { } while ((uint64_t)(4608 * 1024 * 1024 * i));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
do { } while ((1ULL * ((4608) * ((1024) * (1024))) + 2ULL));
// expected-warning@+1 2{{overflow in expression; result is 536870912 with type 'int'}}
do { } while ((uint64_t)((uint64_t)(4608 * 1024 * 1024) * (uint64_t)(4608 * 1024 * 1024)));
// expected-warning@+3 {{overflow in expression; result is 536870912 with type 'int'}}
// expected-warning@+3 {{overflow in expression; result is 536870912 with type 'int'}}
// expected-warning@+3 {{overflow in expression; result is 536870912 with type 'int'}}
for (uint64_t i = 4608 * 1024 * 1024;
(uint64_t)(4608 * 1024 * 1024);
i += (uint64_t)(4608 * 1024 * 1024 * i));
// expected-warning@+3 {{overflow in expression; result is 536870912 with type 'int'}}
// expected-warning@+3 2{{overflow in expression; result is 536870912 with type 'int'}}
// expected-warning@+3 2{{overflow in expression; result is 536870912 with type 'int'}}
for (uint64_t i = (1ULL * ((4608) * ((1024) * (1024))) + 2ULL);
((uint64_t)((uint64_t)(4608 * 1024 * 1024) * (uint64_t)(4608 * 1024 * 1024)));
i = ((4608 * 1024 * 1024) + ((uint64_t)(4608 * 1024 * 1024))));
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
_Complex long long x = 4608 * 1024 * 1024;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
(__real__ x) = 4608 * 1024 * 1024;
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
(__imag__ x) = 4608 * 1024 * 1024;
// expected-warning@+4 {{overflow in expression; result is 536870912 with type 'int'}}
// expected-warning@+3 {{array index 536870912 is past the end of the array (that has type 'uint64_t[10]' (aka 'unsigned long long[10]'))}}
// expected-note@+1 {{array 'a' declared here}}
uint64_t a[10];
a[4608 * 1024 * 1024] = 1i;
// expected-warning@+2 {{overflow in expression; result is 536870912 with type 'int'}}
uint64_t *b;
uint64_t b2 = b[4608 * 1024 * 1024] + 1;
// expected-warning@+1 2{{overflow in expression; result is 536870912 with type 'int'}}
(void)((i ? (4608 * 1024 * 1024) : (4608 * 1024 * 1024)) + 1);
// expected-warning@+1 2{{overflow in expression; result is 536870912 with type 'int'}}
return ((4608 * 1024 * 1024) + ((uint64_t)(4608 * 1024 * 1024)));
}
void check_integer_overflows_in_function_calls(void) {
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
(void)f0(4608 * 1024 * 1024);
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
uint64_t x = f0(4608 * 1024 * 1024);
// expected-warning@+2 {{overflow in expression; result is 536870912 with type 'int'}}
uint64_t (*f0_ptr)(uint64_t) = &f0;
(void)(*f0_ptr)(4608 * 1024 * 1024);
// expected-warning@+1 {{overflow in expression; result is 536870912 with type 'int'}}
(void)f2(0, f0(4608 * 1024 * 1024));
}
void check_integer_overflows_in_array_size(void) {
int arr[4608 * 1024 * 1024]; // expected-warning {{overflow in expression; result is 536870912 with type 'int'}}
}
struct s {
unsigned x;
unsigned y;
} s = {
.y = 5,
.x = 4 * 1024 * 1024 * 1024 // expected-warning {{overflow in expression; result is 0 with type 'int'}}
};
struct s2 {
unsigned a0;
struct s3 {
unsigned a2;
struct s4 {
unsigned a4;
} a3;
} a1;
} s2 = {
.a0 = 4 * 1024 * 1024 * 1024, // expected-warning {{overflow in expression; result is 0 with type 'int'}}
{
.a2 = 4 * 1024 * 1024 * 1024, // expected-warning {{overflow in expression; result is 0 with type 'int'}}
{
.a4 = 4 * 1024 * 1024 * 1024 // expected-warning {{overflow in expression; result is 0 with type 'int'}}
}
}
};
void PR49619(void) {
int n;
n = ({
while (1)
;
0;
});
}
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