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bc: stop using p->exits when parsing if()

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function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2180    2138     -42

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-12-16 21:29:08 +01:00
parent 7415633128
commit 6b5b46f817
1 changed files with 5 additions and 13 deletions
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18
miscutils/bc.c
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@ -4110,7 +4110,6 @@ static BC_STATUS zbc_parse_if(BcParse *p)
{
BcStatus s;
BcInstPtr ip;
BcInstPtr *ipp;
size_t *label;
dbg_lex_enter("%s:%d entered", __func__, __LINE__);
@ -4132,8 +4131,6 @@ static BC_STATUS zbc_parse_if(BcParse *p)
ip.idx = p->func->labels.len;
ip.func = ip.len = 0;
bc_parse_pushIndex(p, ip.idx);
//TODO: can get rid of p->exits stack?
bc_vec_push(&p->exits, &ip);
bc_vec_push(&p->func->labels, &ip.idx);
s = zbc_parse_stmt_fail_if_bare_NLINE(p, false, "if");
@ -4147,32 +4144,27 @@ static BC_STATUS zbc_parse_if(BcParse *p)
if (s) RETURN_STATUS(s);
ip2.idx = p->func->labels.len;
ip2.func = ip.len = 0;
ip2.func = ip2.len = 0;
dbg_lex("%s:%d after if() body: BC_INST_JUMP to %d", __func__, __LINE__, ip.idx);
bc_parse_push(p, BC_INST_JUMP);
bc_parse_pushIndex(p, ip2.idx);
ipp = bc_vec_top(&p->exits);
label = bc_vec_item(&p->func->labels, ipp->idx);
label = bc_vec_item(&p->func->labels, ip.idx);
dbg_lex("%s:%d rewriting label: %d -> %d", __func__, __LINE__, *label, p->func->code.len);
*label = p->func->code.len;
bc_vec_pop(&p->exits);
bc_vec_push(&p->exits, &ip2);
bc_vec_push(&p->func->labels, &ip2.idx);
ip.idx = ip2.idx;
s = zbc_parse_stmt(p);
s = zbc_parse_stmt_fail_if_bare_NLINE(p, false, "else");
if (s) RETURN_STATUS(s);
}
ipp = bc_vec_top(&p->exits);
label = bc_vec_item(&p->func->labels, ipp->idx);
label = bc_vec_item(&p->func->labels, ip.idx);
dbg_lex("%s:%d rewriting label: %d -> %d", __func__, __LINE__, *label, p->func->code.len);
*label = p->func->code.len;
bc_vec_pop(&p->exits);
dbg_lex_done("%s:%d done", __func__, __LINE__);
RETURN_STATUS(s);
}