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Correctly support all unary expression with sizeof

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Unary expression can start with a parenthesis. Thus, the current test
to detect which sizeof form is being parsed is inaccurate. This patch
makes tcc able to handle things like sizeof (x)[1] where x is declared
as char x[5]; wich is a valid unary expression
This commit is contained in:
Thomas Preud'homme 2010-04-11 01:53:40 +02:00
parent 6655e06ec8
commit 8de9b7a631
1 changed files with 19 additions and 6 deletions
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25
tccgen.c
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@ -284,6 +284,13 @@ static void vsetc(CType *type, int r, CValue *vc)
vtop->c = *vc;
}
/* push constant of type "type" with useless value */
void vpush(CType *type)
{
CValue cval;
vsetc(type, VT_CONST, &cval);
}
/* push integer constant */
ST_FUNC void vpushi(int v)
{
@ -3244,11 +3251,14 @@ static void vpush_tokc(int t)
ST_FUNC void unary(void)
{
int n, t, align, size, r;
int n, t, align, size, r, sizeof_caller;
CType type;
Sym *s;
AttributeDef ad;
static int in_sizeof = 0;
sizeof_caller = in_sizeof;
in_sizeof = 0;
/* XXX: GCC 2.95.3 does not generate a table although it should be
better here */
tok_next:
@ -3345,6 +3355,10 @@ ST_FUNC void unary(void)
memset(&ad, 0, sizeof(AttributeDef));
decl_initializer_alloc(&type, &ad, r, 1, 0, 0);
} else {
if (sizeof_caller) {
vpush(&type);
return;
}
unary();
gen_cast(&type);
}
@ -3414,11 +3428,8 @@ ST_FUNC void unary(void)
case TOK_ALIGNOF2:
t = tok;
next();
if (tok == '(') {
parse_expr_type(&type);
} else {
unary_type(&type);
}
in_sizeof++;
unary_type(&type); // Perform a in_sizeof = 0;
size = type_size(&type, &align);
if (t == TOK_SIZEOF) {
if (size < 0)
@ -4040,9 +4051,11 @@ static void expr_type(CType *type)
static void unary_type(CType *type)
{
int a;
void *vtop_saved;
a = nocode_wanted;
nocode_wanted = 1;
vtop_saved = vtop;
unary();
*type = vtop->type;
vpop();