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Guard match from GC when scanning string

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We need to guard match from GC because otherwise it could end up being
reclaimed or moved in compaction.
This commit is contained in:
Peter Zhu 2023-11-27 14:45:47 -05:00
parent 1acea50100
commit 94015e0dce
2 changed files with 21 additions and 11 deletions
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28
string.c
View File

@ -9973,11 +9973,11 @@ rb_str_strip(VALUE str)
static VALUE
scan_once(VALUE str, VALUE pat, long *start, int set_backref_str)
{
VALUE result, match;
struct re_registers *regs;
int i;
VALUE result = Qnil;
long end, pos = rb_pat_search(pat, str, *start, set_backref_str);
if (pos >= 0) {
VALUE match;
struct re_registers *regs;
if (BUILTIN_TYPE(pat) == T_STRING) {
regs = NULL;
end = pos + RSTRING_LEN(pat);
@ -9988,6 +9988,7 @@ scan_once(VALUE str, VALUE pat, long *start, int set_backref_str)
pos = BEG(0);
end = END(0);
}
if (pos == end) {
rb_encoding *enc = STR_ENC_GET(str);
/*
@ -10002,22 +10003,27 @@ scan_once(VALUE str, VALUE pat, long *start, int set_backref_str)
else {
*start = end;
}
if (!regs || regs->num_regs == 1) {
result = rb_str_subseq(str, pos, end - pos);
return result;
}
result = rb_ary_new2(regs->num_regs);
for (i=1; i < regs->num_regs; i++) {
VALUE s = Qnil;
if (BEG(i) >= 0) {
s = rb_str_subseq(str, BEG(i), END(i)-BEG(i));
else {
result = rb_ary_new2(regs->num_regs);
for (int i = 1; i < regs->num_regs; i++) {
VALUE s = Qnil;
if (BEG(i) >= 0) {
s = rb_str_subseq(str, BEG(i), END(i)-BEG(i));
}
rb_ary_push(result, s);
}
rb_ary_push(result, s);
}
return result;
RB_GC_GUARD(match);
}
return Qnil;
return result;
}

4
test/ruby/test_string.rb
View File

@ -1622,6 +1622,10 @@ CODE
assert_equal(%w[1 2 3], S("a1 a2 a3").scan(/a\K./))
end
def test_scan_gc_compact_stress
EnvUtil.under_gc_compact_stress { assert_equal([["1a"], ["2b"], ["3c"]], S("1a2b3c").scan(/(\d.)/)) }
end
def test_scan_segv
bug19159 = '[Bug #19159]'
assert_nothing_raised(Exception, bug19159) do