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compile.c: remove more unreachable chunk

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* compile.c (remove_unreachable_chunk): remove beyond labels to be
  removed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61617 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2018-01-05 14:23:22 +00:00
parent 26df9588d6
commit 665839ddda
1 changed files with 30 additions and 8 deletions
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38
compile.c
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@ -2330,25 +2330,48 @@ replace_destination(INSN *dobj, INSN *nobj)
if (!dl->refcnt) ELEM_REMOVE(&dl->link);
}
static LABEL*
find_destination(INSN *i)
{
int pos, len = insn_len(i->insn_id);
for (pos = 0; pos < len; ++pos) {
if (insn_op_types(i->insn_id)[pos] == TS_OFFSET) {
return (LABEL *)OPERAND_AT(i, pos);
}
}
return 0;
}
static int
remove_unreachable_chunk(rb_iseq_t *iseq, LINK_ELEMENT *i)
{
LINK_ELEMENT *first = i, *end;
int *unref_counts = 0, nlabels = ISEQ_COMPILE_DATA(iseq)->label_no;
if (!i) return 0;
while (i) {
unref_counts = ALLOCA_N(int, nlabels);
MEMZERO(unref_counts, int, nlabels);
end = i;
do {
LABEL *lab;
if (IS_INSN(i)) {
if (IS_INSN_ID(i, jump) || IS_INSN_ID(i, leave)) {
if (IS_INSN_ID(i, leave)) {
end = i;
break;
}
else if ((lab = find_destination((INSN *)i)) != 0) {
if (lab->unremovable) break;
unref_counts[lab->label_no]++;
}
}
else if (IS_LABEL(i)) {
if (((LABEL *)i)->unremovable) return 0;
if (((LABEL *)i)->refcnt > 0) {
lab = (LABEL *)i;
if (lab->unremovable) return 0;
if (lab->refcnt > unref_counts[lab->label_no]) {
if (i == first) return 0;
i = i->prev;
break;
}
continue;
}
else if (IS_TRACE(i)) {
/* do nothing */
@ -2357,9 +2380,8 @@ remove_unreachable_chunk(rb_iseq_t *iseq, LINK_ELEMENT *i)
LABEL *dest = ((ADJUST *)i)->label;
if (dest && dest->unremovable) return 0;
}
i = i->next;
}
end = i;
end = i;
} while ((i = i->next) != 0);
i = first;
do {
if (IS_INSN(i)) {