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--traditional now "fixes" (ie, breaks) operator precedence to match qcc

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except for the relationship between "=" and "&&" and "||": not sure I want
to go that far towards bug compatability.
This commit is contained in:
Bill Currie 2003-09-22 22:15:31 +00:00
parent ad61e0684c
commit ba26628b80
1 changed files with 48 additions and 12 deletions
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60
tools/qfcc/source/expr.c
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@ -1508,6 +1508,52 @@ is_logic (int op)
return 0;
}
static expr_t *
check_precedence (int op, expr_t *e1, expr_t *e2)
{
if (e1->type == ex_uexpr && e1->e.expr.op == '!' && !e1->paren) {
if (options.traditional) {
if (op != AND && op != OR && op != '=') {
notice (e1, "precedence of `!' and `%s' inverted for "
"traditional code", get_op_string (op));
e1->e.expr.e1->paren = 1;
return unary_expr ('!', binary_expr (op, e1->e.expr.e1, e2));
}
} else if (op == '&' || op == '|') {
warning (e1, "ambiguous logic. Suggest explicit parentheses with "
"expressions involving ! and %s", get_op_string (op));
}
}
if (options.traditional) {
if (e2->type == ex_expr && !e2->paren) {
if (((op == '&' || op == '|')
&& (e2->e.expr.op == '*' || e2->e.expr.op == '/'
|| e2->e.expr.op == '+' || e2->e.expr.op == '-'
|| is_compare (e2->e.expr.op)))
|| (op == '='
&& (e2->e.expr.op == OR || e2->e.expr.op == AND))) {
notice (e1, "precedence of `%s' and `%s' inverted for "
"traditional code", get_op_string (op),
get_op_string (e2->e.expr.op));
e1 = binary_expr (op, e1, e2->e.expr.e1);
e1->paren = 1;
return binary_expr (e2->e.expr.op, e1, e2->e.expr.e2);
}
if (((op == EQ || op == NE) && is_compare (e2->e.expr.op))
|| (op == OR && e2->e.expr.op == AND)
|| (op == '|' && e2->e.expr.op == '&')) {
notice (e1, "precedence of `%s' raised to `%s' for "
"traditional code", get_op_string (op),
get_op_string (e2->e.expr.op));
e1 = binary_expr (op, e1, e2->e.expr.e1);
e1->paren = 1;
return binary_expr (e2->e.expr.op, e1, e2->e.expr.e2);
}
}
}
return 0;
}
expr_t *
binary_expr (int op, expr_t *e1, expr_t *e2)
{
@ -1626,18 +1672,8 @@ binary_expr (int op, expr_t *e1, expr_t *e2)
if (e1->type >= ex_string && e2->type >= ex_string)
return binary_const (op, e1, e2);
if ((op == '&' || op == '|' || is_compare (op))
&& e1->type == ex_uexpr && e1->e.expr.op == '!' && !e1->paren) {
if (options.traditional) {
notice (e1, "precedence of `!' and `%s' inverted for traditional "
"code", get_op_string (op));
e1->e.expr.e1->paren = 1;
return unary_expr ('!', binary_expr (op, e1->e.expr.e1, e2));
} else if (!is_compare (op)) {
warning (e1, "ambiguous logic. Suggest explicit parentheses with "
"expressions involving ! and %s", get_op_string (op));
}
}
if ((e = check_precedence (op, e1, e2)))
return e;
if (t1 != t2) {
switch (t1->type) {