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Detect usage of incomplete types inside struct/union

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Make sure the only exception is for a flexible array member
as the last element of a structure
This commit is contained in:
Amine Najahi 2013-10-06 14:43:16 +02:00
parent d0c2f00df2
commit 3b07a15fd1
1 changed files with 12 additions and 1 deletions
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13
tccgen.c
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@ -2740,7 +2740,7 @@ static void parse_attribute(AttributeDef *ad)
/* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
static void struct_decl(CType *type, int u, int tdef)
{
int a, v, size, align, maxalign, c, offset;
int a, v, size, align, maxalign, c, offset, flexible;
int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
Sym *s, *ss, *ass, **ps;
AttributeDef ad;
@ -2814,9 +2814,13 @@ static void struct_decl(CType *type, int u, int tdef)
prevbt = VT_INT;
bit_pos = 0;
offset = 0;
flexible = 0;
while (tok != '}') {
parse_btype(&btype, &ad);
while (1) {
if (flexible)
tcc_error("flexible array member '%s' not at the end of struct",
get_tok_str(v, NULL));
bit_size = -1;
v = 0;
type1 = btype;
@ -2824,6 +2828,13 @@ static void struct_decl(CType *type, int u, int tdef)
type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
expect("identifier");
if (type_size(&type1, &align) < 0) {
if ((a == TOK_STRUCT) && (type1.t & VT_ARRAY) && c)
flexible = 1;
else
tcc_error("field '%s' has incomplete type",
get_tok_str(v, NULL));
}
if ((type1.t & VT_BTYPE) == VT_FUNC ||
(type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
tcc_error("invalid type for '%s'",