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(constant_expression_warning, overflow_warning, 

convert_and_check): Distinguish between TREE_OVERFLOW, which is just
for warnings, and TREE_CONSTANT_OVERFLOW, which is for required
pedantic diagnostics.

From-SVN: r4827
This commit is contained in:
Paul Eggert 1993-07-02 01:26:01 +00:00
parent 261450e857
commit 7193bce22f
1 changed files with 12 additions and 28 deletions
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40
gcc/c-common.c
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@ -349,15 +349,8 @@ constant_expression_warning (value)
tree value;
{
if (TREE_CODE (value) == INTEGER_CST && TREE_CONSTANT_OVERFLOW (value))
{
/* ??? This is a warning, not a pedwarn, in 2.4,
because it happens in contexts that are not
"constant expressions" in ANSI C.
Fix the problem differently in 2.5. */
warning ("overflow in constant expression");
/* Suppress duplicate warnings. */
TREE_CONSTANT_OVERFLOW (value) = 0;
}
if (pedantic)
pedwarn ("overflow in constant expression");
}
/* Print a warning if an expression had overflow in folding.
@ -371,14 +364,10 @@ void
overflow_warning (value)
tree value;
{
if (TREE_CODE (value) == INTEGER_CST && TREE_CONSTANT_OVERFLOW (value))
if (TREE_CODE (value) == INTEGER_CST && TREE_OVERFLOW (value))
{
/* ??? This is a warning, not a pedwarn, in 2.4,
because it happens in contexts that are not
"constant expressions" in ANSI C.
Fix the problem differently in 2.5. */
TREE_OVERFLOW (value) = 0;
warning ("integer overflow in expression");
TREE_CONSTANT_OVERFLOW (value) = 0;
}
}
@ -415,20 +404,15 @@ convert_and_check (type, expr)
tree t = convert (type, expr);
if (TREE_CODE (t) == INTEGER_CST)
{
if (TREE_UNSIGNED (TREE_TYPE (expr))
&& !TREE_UNSIGNED (type)
&& TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
&& TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr)))
/* No warning for converting 0x80000000 to int. */
TREE_CONSTANT_OVERFLOW (t) = 0;
else if (TREE_CONSTANT_OVERFLOW (t))
if (TREE_OVERFLOW (t))
{
/* ??? This is a warning, not a pedwarn, in 2.4,
because it happens in contexts that are not
"constant expressions" in ANSI C.
Fix the problem differently in 2.5. */
warning ("overflow in implicit constant conversion");
TREE_CONSTANT_OVERFLOW (t) = 0;
TREE_OVERFLOW (t) = 0;
/* No warning for converting 0x80000000 to int. */
if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
&& TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
&& TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
warning ("overflow in implicit constant conversion");
}
else
unsigned_conversion_warning (t, expr);