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Fix #81424: PCRE2 10.35 JIT performance regression

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We backport the respective upstream fix[1] to our bundled pcre2lib plus
the follow-up fix[2] for a functional regression.

[1] <dc5f966635>
[2] <e7af7efaa1>

Closes GH-7573.
This commit is contained in:
Christoph M. Becker 2021-10-12 12:04:16 +02:00
parent fcabe693ba
commit 788a701e22
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GPG key ID: D66C9593118BCCB6
3 changed files with 28 additions and 4 deletions
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11
ext/pcre/pcre2lib/pcre2_jit_compile.c
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@ -1249,10 +1249,13 @@ SLJIT_ASSERT(*cc == OP_ONCE || *cc == OP_BRA || *cc == OP_CBRA);
SLJIT_ASSERT(*cc != OP_CBRA || common->optimized_cbracket[GET2(cc, 1 + LINK_SIZE)] != 0);
SLJIT_ASSERT(start < EARLY_FAIL_ENHANCE_MAX);
next_alt = cc + GET(cc, 1);
if (*next_alt == OP_ALT)
fast_forward_allowed = FALSE;
do
{
count = start;
next_alt = cc + GET(cc, 1);
cc += 1 + LINK_SIZE + ((*cc == OP_CBRA) ? IMM2_SIZE : 0);
while (TRUE)
@ -1521,7 +1524,7 @@ do
{
count++;
if (fast_forward_allowed && *next_alt == OP_KET)
if (fast_forward_allowed)
{
common->fast_forward_bc_ptr = accelerated_start;
common->private_data_ptrs[(accelerated_start + 1) - common->start] = ((*private_data_start) << 3) | type_skip;
@ -1569,8 +1572,8 @@ do
else if (result < count)
result = count;
fast_forward_allowed = FALSE;
cc = next_alt;
next_alt = cc + GET(cc, 1);
}
while (*cc == OP_ALT);
@ -11152,7 +11155,7 @@ early_fail_type = (early_fail_ptr & 0x7);
early_fail_ptr >>= 3;
/* During recursion, these optimizations are disabled. */
if (common->early_fail_start_ptr == 0)
if (common->early_fail_start_ptr == 0 && common->fast_forward_bc_ptr == NULL)
{
early_fail_ptr = 0;
early_fail_type = type_skip;