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[qfcc] Rewrite expr_nil to use memset if necessary 

This fixes the problem with returning nil through @param (and probably
structs in general).
This commit is contained in:
Bill Currie 2020-03-27 20:31:11 +09:00
parent 9c556c07bb
commit fdf6fac077
1 changed files with 24 additions and 6 deletions
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30
tools/qfcc/source/statements.c
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@ -1406,16 +1406,34 @@ static sblock_t *
expr_nil (sblock_t *sblock, expr_t *e, operand_t **op)
{
type_t *nil = e->e.nil;
expr_t *ptr;
expr_t *size_expr;
size_t nil_size;
operand_t *zero;
operand_t *size;
statement_t *s;
if (!is_struct (nil) && !is_array (nil)) {
*op = value_operand (new_nil_val (nil), e);
return sblock;
}
ptr = expr_file_line (address_expr (new_temp_def_expr (nil), 0, 0), e);
expr_file_line (ptr, e);
sblock = statement_subexpr (sblock, ptr, op);
e = expr_file_line (new_memset_expr (ptr, new_integer_expr (0), nil), e);
sblock = statement_slist (sblock, e);
if (!*op) {
*op = temp_operand (nil, e);
}
nil_size = type_size (nil);
if (nil_size < 0x10000) {
size_expr = new_short_expr (nil_size);
} else {
size_expr = new_integer_expr (nil_size);
}
sblock = statement_subexpr (sblock, new_integer_expr(0), &zero);
sblock = statement_subexpr (sblock, size_expr, &size);
s = new_statement (st_move, "<MEMSET>", e);
s->opa = zero;
s->opb = size;
s->opc = *op;
sblock_add_statement (sblock, s);
return sblock;
}