/* Test for diagnostics for constant overflow. */
|
/* Test for diagnostics for constant overflow. */
|
/* Origin: Joseph Myers */
|
/* Origin: Joseph Myers */
|
/* { dg-do compile } */
|
/* { dg-do compile } */
|
/* { dg-options "" } */
|
/* { dg-options "" } */
|
|
|
#include
|
#include
|
|
|
enum e {
|
enum e {
|
E0 = INT_MAX,
|
E0 = INT_MAX,
|
/* Unsigned overflow wraps around. */
|
/* Unsigned overflow wraps around. */
|
E1 = UINT_MAX + 1,
|
E1 = UINT_MAX + 1,
|
/* Overflow in an unevaluated part of an expression is OK (example
|
/* Overflow in an unevaluated part of an expression is OK (example
|
in the standard). */
|
in the standard). */
|
E2 = 2 || 1 / 0, /* { dg-bogus "warning: division by zero" "" { xfail *-*-* } 14 } */
|
E2 = 2 || 1 / 0, /* { dg-bogus "warning: division by zero" "" { xfail *-*-* } 14 } */
|
E3 = 1 / 0, /* { dg-warning "division by zero" } */
|
E3 = 1 / 0, /* { dg-warning "division by zero" } */
|
/* { dg-error "enumerator value for 'E3' is not an integer constant" "enum error" { target *-*-* } 15 } */
|
/* { dg-error "enumerator value for 'E3' is not an integer constant" "enum error" { target *-*-* } 15 } */
|
/* But as in DR#031, the 1/0 in an evaluated subexpression means the
|
/* But as in DR#031, the 1/0 in an evaluated subexpression means the
|
whole expression violates the constraints. */
|
whole expression violates the constraints. */
|
E4 = 0 * (1 / 0), /* { dg-warning "division by zero" } */
|
E4 = 0 * (1 / 0), /* { dg-warning "division by zero" } */
|
/* { dg-error "enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
|
/* { dg-error "enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
|
E5 = INT_MAX + 1, /* { dg-warning "integer overflow in expression" } */
|
E5 = INT_MAX + 1, /* { dg-warning "integer overflow in expression" } */
|
/* Again, overflow in evaluated subexpression. */
|
/* Again, overflow in evaluated subexpression. */
|
E6 = 0 * (INT_MAX + 1), /* { dg-warning "integer overflow in expression" } */
|
E6 = 0 * (INT_MAX + 1), /* { dg-warning "integer overflow in expression" } */
|
/* A cast does not constitute overflow in conversion. */
|
/* A cast does not constitute overflow in conversion. */
|
E7 = (char) INT_MAX
|
E7 = (char) INT_MAX
|
};
|
};
|
|
|
struct s {
|
struct s {
|
int a;
|
int a;
|
int : 0 * (1 / 0); /* { dg-warning "division by zero" } */
|
int : 0 * (1 / 0); /* { dg-warning "division by zero" } */
|
int : 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
|
int : 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
|
};
|
};
|
|
|
void
|
void
|
f (void)
|
f (void)
|
{
|
{
|
/* This expression is not required to be a constant expression, so
|
/* This expression is not required to be a constant expression, so
|
it should just involve undefined behavior at runtime. */
|
it should just involve undefined behavior at runtime. */
|
int c = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
|
int c = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
|
}
|
}
|
|
|
/* This expression is neither required to be constant. */
|
/* This expression is neither required to be constant. */
|
static int sc = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
|
static int sc = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
|
|
|
|
|
// Test for overflow in null pointer constant.
|
// Test for overflow in null pointer constant.
|
void *n = 0;
|
void *n = 0;
|
/* The first two of these involve overflow, so are not null pointer
|
/* The first two of these involve overflow, so are not null pointer
|
constants. The third has the overflow in an unevaluated
|
constants. The third has the overflow in an unevaluated
|
subexpression, so is a null pointer constant. */
|
subexpression, so is a null pointer constant. */
|
void *p = 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
|
void *p = 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
|
/* { dg-error "invalid conversion from 'int' to 'void" "null" { target *-*-* } 51 } */
|
/* { dg-error "invalid conversion from 'int' to 'void" "null" { target *-*-* } 51 } */
|
void *q = 0 * (1 / 0); /* { dg-warning "division by zero" } */
|
void *q = 0 * (1 / 0); /* { dg-warning "division by zero" } */
|
/* { dg-error "invalid conversion from 'int' to 'void*'" "null" { xfail *-*-* } 53 } */
|
/* { dg-error "invalid conversion from 'int' to 'void*'" "null" { xfail *-*-* } 53 } */
|
void *r = (1 ? 0 : INT_MAX+1); /* { dg-bogus "integer overflow in expression" "" { xfail *-*-* } 55 } */
|
void *r = (1 ? 0 : INT_MAX+1); /* { dg-bogus "integer overflow in expression" "" { xfail *-*-* } 55 } */
|
|
|
void
|
void
|
g (int i)
|
g (int i)
|
{
|
{
|
switch (i)
|
switch (i)
|
{
|
{
|
case 0 * (1/0): /* { dg-warning "division by zero" } */
|
case 0 * (1/0): /* { dg-warning "division by zero" } */
|
;
|
;
|
case 1 + 0 * (INT_MAX + 1): /* { dg-warning "integer overflow in expression" } */
|
case 1 + 0 * (INT_MAX + 1): /* { dg-warning "integer overflow in expression" } */
|
;
|
;
|
}
|
}
|
}
|
}
|
|
|
int
|
int
|
h (void)
|
h (void)
|
{
|
{
|
return INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
|
return INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
|
}
|
}
|
|
|
int
|
int
|
h1 (void)
|
h1 (void)
|
{
|
{
|
return INT_MAX + 1 - INT_MAX; /* { dg-warning "integer overflow in expression" } */
|
return INT_MAX + 1 - INT_MAX; /* { dg-warning "integer overflow in expression" } */
|
}
|
}
|
|
|
void fuc (unsigned char);
|
void fuc (unsigned char);
|
void fsc (signed char);
|
void fsc (signed char);
|
|
|
void
|
void
|
h2 (void)
|
h2 (void)
|
{
|
{
|
fsc (SCHAR_MAX + 1);
|
fsc (SCHAR_MAX + 1);
|
fsc (SCHAR_MIN - 1); /* { dg-warning "overflow in implicit constant conversion" } */
|
fsc (SCHAR_MIN - 1); /* { dg-warning "overflow in implicit constant conversion" } */
|
fsc (UCHAR_MAX);
|
fsc (UCHAR_MAX);
|
fsc (UCHAR_MAX + 1); /* { dg-warning "overflow in implicit constant conversion" } */
|
fsc (UCHAR_MAX + 1); /* { dg-warning "overflow in implicit constant conversion" } */
|
fuc (-1);
|
fuc (-1);
|
fuc (UCHAR_MAX + 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
|
fuc (UCHAR_MAX + 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
|
fuc (SCHAR_MIN);
|
fuc (SCHAR_MIN);
|
fuc (SCHAR_MIN - 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
|
fuc (SCHAR_MIN - 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
|
fuc (-UCHAR_MAX); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
|
fuc (-UCHAR_MAX); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
|
}
|
}
|
|
|
void fui (unsigned int);
|
void fui (unsigned int);
|
void fsi (signed int);
|
void fsi (signed int);
|
|
|
int si;
|
int si;
|
unsigned ui;
|
unsigned ui;
|
|
|
void
|
void
|
h2i (int x)
|
h2i (int x)
|
{
|
{
|
/* For some reason, we only give certain warnings for implicit
|
/* For some reason, we only give certain warnings for implicit
|
conversions among values of the same precision with -Wconversion,
|
conversions among values of the same precision with -Wconversion,
|
while we don't give others at all. */
|
while we don't give others at all. */
|
fsi ((unsigned)INT_MAX + 1);
|
fsi ((unsigned)INT_MAX + 1);
|
si = (unsigned)INT_MAX + 1;
|
si = (unsigned)INT_MAX + 1;
|
si = x ? (unsigned)INT_MAX + 1 : 1;
|
si = x ? (unsigned)INT_MAX + 1 : 1;
|
fsi ((unsigned)INT_MAX + 2);
|
fsi ((unsigned)INT_MAX + 2);
|
si = (unsigned)INT_MAX + 2;
|
si = (unsigned)INT_MAX + 2;
|
si = x ? (unsigned)INT_MAX + 2 : 1;
|
si = x ? (unsigned)INT_MAX + 2 : 1;
|
fsi (UINT_MAX);
|
fsi (UINT_MAX);
|
si = UINT_MAX;
|
si = UINT_MAX;
|
fui (-1);
|
fui (-1);
|
ui = -1;
|
ui = -1;
|
ui = x ? -1 : 1U;
|
ui = x ? -1 : 1U;
|
fui (INT_MIN);
|
fui (INT_MIN);
|
ui = INT_MIN;
|
ui = INT_MIN;
|
ui = x ? INT_MIN : 1U;
|
ui = x ? INT_MIN : 1U;
|
}
|
}
|
|
|
