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overflow-warn-1.c, [...]: New tests.

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* gcc.dg/overflow-warn-1.c, gcc.dg/overflow-warn-2.c,
	gcc.dg/overflow-warn-3.c, gcc.dg/overflow-warn-4.c: New tests.

From-SVN: r95068
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Joseph Myers 2005-02-15 18:52:15 +00:00 committed by Joseph Myers
parent 9a6cf91138
commit 88fb930d2f
5 changed files with 514 additions and 0 deletions
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5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2005-02-15 Joseph S. Myers <joseph@codesourcery.com>
* gcc.dg/overflow-warn-1.c, gcc.dg/overflow-warn-2.c,
gcc.dg/overflow-warn-3.c, gcc.dg/overflow-warn-4.c: New tests.
2005-02-15 Andreas Schwab <schwab@suse.de>
* ada/acats/tests/cxb/cxb30131.c: Include <stdlib.h> to properly

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gcc/testsuite/gcc.dg/overflow-warn-1.c Normal file
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/* Test for diagnostics for constant overflow. */
/* Origin: Joseph Myers <joseph@codesourcery.com> */
/* { dg-do compile } */
/* { dg-options "-std=c99" } */
#include <limits.h>
enum e {
E0 = INT_MAX,
/* Unsigned overflow wraps around. */
E1 = UINT_MAX + 1,
/* Overflow in an unevaluated part of an expression is OK (example
in the standard). */
E2 = 2 || 1 / 0,
E3 = 1 / 0, /* { dg-warning "warning: division by zero" } */
/* { dg-error "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
whole expression violates the constraints. */
E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */
/* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */
/* Again, overflow in evaluated subexpression. */
E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */
/* A cast does not constitute overflow in conversion. */
E7 = (char) INT_MAX
};
struct s {
int a;
int : 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
};
void
f (void)
{
/* This expression is not required to be a constant expression, so
it should just involve undefined behavior at runtime. */
int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
}
/* But this expression does need to be constant. */
static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
/* The first two of these involve overflow, so are not null pointer
constants. The third has the overflow in an unevaluated
subexpression, so is a null pointer constant. */
void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { target *-*-* } 48 } */
void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 50 } */
void *r = (1 ? 0 : INT_MAX+1);
void
g (int i)
{
switch (i)
{
case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
;
case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */
;
}
}
int
h (void)
{
return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
}
int
h1 (void)
{
return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */
}
void fuc (unsigned char);
void fsc (signed char);
void
h2 (void)
{
fsc (SCHAR_MAX + 1);
fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fsc (UCHAR_MAX);
fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fuc (-1);
fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
fuc (SCHAR_MIN);
fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
}
void fui (unsigned int);
void fsi (signed int);
int si;
unsigned ui;
void
h2i (int x)
{
/* For some reason, we only give certain warnings for implicit
conversions among values of the same precision with -Wconversion,
while we don't give others at all. */
fsi ((unsigned)INT_MAX + 1);
si = (unsigned)INT_MAX + 1;
si = x ? (unsigned)INT_MAX + 1 : 1;
fsi ((unsigned)INT_MAX + 2);
si = (unsigned)INT_MAX + 2;
si = x ? (unsigned)INT_MAX + 2 : 1;
fsi (UINT_MAX);
si = UINT_MAX;
fui (-1);
ui = -1;
ui = x ? -1 : 1U;
fui (INT_MIN);
ui = INT_MIN;
ui = x ? INT_MIN : 1U;
}

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/* Test for diagnostics for constant overflow. Test with -Wconversion. */
/* Origin: Joseph Myers <joseph@codesourcery.com> */
/* { dg-do compile } */
/* { dg-options "-std=c99 -Wconversion" } */
#include <limits.h>
enum e {
E0 = INT_MAX,
/* Unsigned overflow wraps around. */
E1 = UINT_MAX + 1,
/* Overflow in an unevaluated part of an expression is OK (example
in the standard). */
E2 = 2 || 1 / 0,
E3 = 1 / 0, /* { dg-warning "warning: division by zero" } */
/* { dg-error "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
whole expression violates the constraints. */
E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */
/* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */
/* Again, overflow in evaluated subexpression. */
E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */
/* A cast does not constitute overflow in conversion. */
E7 = (char) INT_MAX
};
struct s {
int a;
int : 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
};
void
f (void)
{
/* This expression is not required to be a constant expression, so
it should just involve undefined behavior at runtime. */
int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
}
/* But this expression does need to be constant. */
static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
/* The first two of these involve overflow, so are not null pointer
constants. The third has the overflow in an unevaluated
subexpression, so is a null pointer constant. */
void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { target *-*-* } 48 } */
void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 50 } */
void *r = (1 ? 0 : INT_MAX+1);
void
g (int i)
{
switch (i)
{
case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
;
case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */
;
}
}
int
h (void)
{
return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
}
int
h1 (void)
{
return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */
}
void fuc (unsigned char);
void fsc (signed char);
void
h2 (void)
{
fsc (SCHAR_MAX + 1);
/* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 84 } */
fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
/* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 86 } */
fsc (UCHAR_MAX);
/* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 88 } */
fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
/* { dg-warning "warning: passing argument 1 of 'fsc' with different width due to prototype" "-Wconversion" { target *-*-* } 90 } */
fuc (-1); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
/* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 92 } */
fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
/* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 94 } */
fuc (SCHAR_MIN); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
/* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 96 } */
fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
/* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 98 } */
fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
/* { dg-warning "warning: passing argument 1 of 'fuc' with different width due to prototype" "-Wconversion" { target *-*-* } 100 } */
}
void fui (unsigned int);
void fsi (signed int);
int si;
unsigned ui;
void
h2i (int x)
{
/* For some reason, we only give certain warnings for implicit
conversions among values of the same precision with -Wconversion,
while we don't give others at all. */
fsi ((unsigned)INT_MAX + 1); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */
si = (unsigned)INT_MAX + 1;
si = x ? (unsigned)INT_MAX + 1 : 1;
fsi ((unsigned)INT_MAX + 2); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */
si = (unsigned)INT_MAX + 2;
si = x ? (unsigned)INT_MAX + 2 : 1;
fsi (UINT_MAX); /* { dg-warning "warning: passing argument 1 of 'fsi' as signed due to prototype" } */
si = UINT_MAX;
fui (-1); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
/* { dg-warning "warning: passing argument 1 of 'fui' as unsigned due to prototype" "-Wconversion" { target *-*-* } 124 } */
ui = -1; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
ui = x ? -1 : 1U; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
fui (INT_MIN); /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
/* { dg-warning "warning: passing argument 1 of 'fui' as unsigned due to prototype" "-Wconversion" { target *-*-* } 128 } */
ui = INT_MIN; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
ui = x ? INT_MIN : 1U; /* { dg-warning "warning: negative integer implicitly converted to unsigned type" } */
}

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/* Test for diagnostics for constant overflow. Test with -pedantic. */
/* Origin: Joseph Myers <joseph@codesourcery.com> */
/* { dg-do compile } */
/* { dg-options "-std=c99 -pedantic" } */
#include <limits.h>
enum e {
E0 = INT_MAX,
/* Unsigned overflow wraps around. */
E1 = UINT_MAX + 1,
/* Overflow in an unevaluated part of an expression is OK (example
in the standard). */
E2 = 2 || 1 / 0,
E3 = 1 / 0, /* { dg-warning "warning: division by zero" } */
/* { dg-error "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
whole expression violates the constraints. */
E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */
/* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: overflow in constant expression" "constant" { target *-*-* } 21 } */
/* Again, overflow in evaluated subexpression. */
E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: overflow in constant expression" "constant" { target *-*-* } 24 } */
/* A cast does not constitute overflow in conversion. */
E7 = (char) INT_MAX
};
struct s {
int a;
int : 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: overflow in constant expression" "constant" { target *-*-* } 33 } */
};
void
f (void)
{
/* This expression is not required to be a constant expression, so
it should just involve undefined behavior at runtime. */
int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-bogus "warning: overflow in constant expression" "constant" { xfail *-*-* } 42 } */
}
/* But this expression does need to be constant. */
static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: overflow in constant expression" "constant" { target *-*-* } 47 } */
/* The first two of these involve overflow, so are not null pointer
constants. The third has the overflow in an unevaluated
subexpression, so is a null pointer constant. */
void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: overflow in constant expression" "constant" { target *-*-* } 53 } */
/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { target *-*-* } 53 } */
void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
/* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 56 } */
void *r = (1 ? 0 : INT_MAX+1);
void
g (int i)
{
switch (i)
{
case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
;
case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-warning "warning: overflow in constant expression" "constant" { target *-*-* } 67 } */
;
}
}
int
h (void)
{
return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
}
int
h1 (void)
{
return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */
}
void fuc (unsigned char);
void fsc (signed char);
void
h2 (void)
{
fsc (SCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fsc (UCHAR_MAX); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fuc (-1);
fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
fuc (SCHAR_MIN);
fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
}
void fui (unsigned int);
void fsi (signed int);
int si;
unsigned ui;
void
h2i (int x)
{
/* For some reason, we only give certain warnings for implicit
conversions among values of the same precision with -Wconversion,
while we don't give others at all. */
fsi ((unsigned)INT_MAX + 1);
si = (unsigned)INT_MAX + 1;
si = x ? (unsigned)INT_MAX + 1 : 1;
fsi ((unsigned)INT_MAX + 2);
si = (unsigned)INT_MAX + 2;
si = x ? (unsigned)INT_MAX + 2 : 1;
fsi (UINT_MAX);
si = UINT_MAX;
fui (-1);
ui = -1;
ui = x ? -1 : 1U;
fui (INT_MIN);
ui = INT_MIN;
ui = x ? INT_MIN : 1U;
}

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/* Test for diagnostics for constant overflow. Test with -pedantic-errors. */
/* Origin: Joseph Myers <joseph@codesourcery.com> */
/* { dg-do compile } */
/* { dg-options "-std=c99 -pedantic-errors" } */
#include <limits.h>
enum e {
E0 = INT_MAX,
/* Unsigned overflow wraps around. */
E1 = UINT_MAX + 1,
/* Overflow in an unevaluated part of an expression is OK (example
in the standard). */
E2 = 2 || 1 / 0,
E3 = 1 / 0, /* { dg-warning "warning: division by zero" } */
/* { dg-error "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
whole expression violates the constraints. */
E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */
/* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 21 } */
/* Again, overflow in evaluated subexpression. */
E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 24 } */
/* A cast does not constitute overflow in conversion. */
E7 = (char) INT_MAX
};
struct s {
int a;
int : 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 33 } */
};
void
f (void)
{
/* This expression is not required to be a constant expression, so
it should just involve undefined behavior at runtime. */
int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-bogus "error: overflow in constant expression" "constant" { xfail *-*-* } 42 } */
}
/* But this expression does need to be constant. */
static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 47 } */
/* The first two of these involve overflow, so are not null pointer
constants. The third has the overflow in an unevaluated
subexpression, so is a null pointer constant. */
void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 53 } */
/* { dg-error "error: initialization makes pointer from integer without a cast" "null" { target *-*-* } 53 } */
void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
/* { dg-error "error: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 56 } */
void *r = (1 ? 0 : INT_MAX+1);
void
g (int i)
{
switch (i)
{
case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
;
case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */
/* { dg-error "error: overflow in constant expression" "constant" { target *-*-* } 67 } */
;
}
}
int
h (void)
{
return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
}
int
h1 (void)
{
return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */
}
void fuc (unsigned char);
void fsc (signed char);
void
h2 (void)
{
fsc (SCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fsc (UCHAR_MAX); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
fuc (-1);
fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
fuc (SCHAR_MIN);
fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
}
void fui (unsigned int);
void fsi (signed int);
int si;
unsigned ui;
void
h2i (int x)
{
/* For some reason, we only give certain warnings for implicit
conversions among values of the same precision with -Wconversion,
while we don't give others at all. */
fsi ((unsigned)INT_MAX + 1);
si = (unsigned)INT_MAX + 1;
si = x ? (unsigned)INT_MAX + 1 : 1;
fsi ((unsigned)INT_MAX + 2);
si = (unsigned)INT_MAX + 2;
si = x ? (unsigned)INT_MAX + 2 : 1;
fsi (UINT_MAX);
si = UINT_MAX;
fui (-1);
ui = -1;
ui = x ? -1 : 1U;
fui (INT_MIN);
ui = INT_MIN;
ui = x ? INT_MIN : 1U;
}