[C++ PATCH] Fix error handling in build_enumerator (PR c++/37389)
Jakub Jelinek
jakub@redhat.com
Tue Sep 9 20:14:00 GMT 2008
On Tue, Sep 09, 2008 at 08:39:22AM -0700, Mark Mitchell wrote:
> > later in build_enumerator. Should I drop that
> > "if (value == error_mark_node) value = NULL_TREE;" ?
>
> Yes, please. Conceptually, the value should not be NULL once we've seen
> the initializer; it's erroneous, but it exists.
Ok, bootstrapped & regtested on x86_64-linux.
2008-09-09 Jakub Jelinek <jakub@redhat.com>
PR c++/37389
* decl.c (build_enumerator): Handle previous value's DECL_INITIAL
being error_operand_p. Don't clear value if it was error_mark_node.
* g++.dg/parse/enum4.C: New test.
--- gcc/cp/decl.c.jj 2008-09-09 09:31:02.000000000 +0200
+++ gcc/cp/decl.c 2008-09-09 09:34:29.000000000 +0200
@@ -11143,21 +11143,26 @@ build_enumerator (tree name, tree value,
tree prev_value;
bool overflowed;
- /* The next value is the previous value plus one. We can
- safely assume that the previous value is an INTEGER_CST.
+ /* The next value is the previous value plus one.
add_double doesn't know the type of the target expression,
so we must check with int_fits_type_p as well. */
prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
- overflowed = add_double (TREE_INT_CST_LOW (prev_value),
- TREE_INT_CST_HIGH (prev_value),
- 1, 0, &lo, &hi);
- value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
- overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
-
- if (overflowed)
+ if (error_operand_p (prev_value))
+ value = error_mark_node;
+ else
{
- error ("overflow in enumeration values at %qD", name);
- value = error_mark_node;
+ overflowed = add_double (TREE_INT_CST_LOW (prev_value),
+ TREE_INT_CST_HIGH (prev_value),
+ 1, 0, &lo, &hi);
+ value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
+ overflowed
+ |= !int_fits_type_p (value, TREE_TYPE (prev_value));
+
+ if (overflowed)
+ {
+ error ("overflow in enumeration values at %qD", name);
+ value = error_mark_node;
+ }
}
}
else
@@ -11181,8 +11186,6 @@ build_enumerator (tree name, tree value,
/* Silently convert the value so that we can continue. */
value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
value, tf_none);
- if (value == error_mark_node)
- value = NULL_TREE;
}
}
--- gcc/testsuite/g++.dg/parse/enum4.C.jj 2008-09-09 09:37:33.000000000 +0200
+++ gcc/testsuite/g++.dg/parse/enum4.C 2008-09-09 09:37:10.000000000 +0200
@@ -0,0 +1,10 @@
+// PR c++/37389
+// { dg-do compile }
+// { dg-options "-std=gnu++98" }
+
+enum
+{
+ A = 9223372036854775807ULL * 2 + 1,
+ B = B0, // { dg-error "was not declared|overflow" }
+ C = C0 // { dg-error "was not declared" }
+};
Jakub
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