From 4851890ede31313655e19180f4959ed348fee580 Mon Sep 17 00:00:00 2001
From: Zoltan Herczeg <zherczeg.u-szeged@partner.samsung.com>
Date: Thu, 14 Jul 2022 05:25:39 +0200
Subject: [PATCH] Fixed an issue in the backtracking optimization of character
 repeats in JIT (#135)

Conflict:adjust changelog
Reference:https://github.com/PCRE2Project/pcre2/commit/4851890ede31313655e19180f4959ed348fee580
---
 src/pcre2_jit_compile.c | 20 ++++++++++----------
 src/pcre2_jit_test.c    |  1 +
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/src/pcre2_jit_compile.c b/src/pcre2_jit_compile.c
index 8f6c090..75ba610 100644
--- a/src/pcre2_jit_compile.c
+++ b/src/pcre2_jit_compile.c
@@ -11357,19 +11357,19 @@ if (exact > 1)
     }
   }
 else if (exact == 1)
-  {
   compile_char1_matchingpath(common, type, cc, &backtrack->topbacktracks, TRUE);
 
-  if (early_fail_type == type_fail_range)
-    {
-    OP1(SLJIT_MOV, TMP1, 0, SLJIT_MEM1(SLJIT_SP), early_fail_ptr);
-    OP1(SLJIT_MOV, TMP2, 0, SLJIT_MEM1(SLJIT_SP), early_fail_ptr + (int)sizeof(sljit_sw));
-    OP2(SLJIT_SUB, TMP1, 0, TMP1, 0, TMP2, 0);
-    OP2(SLJIT_SUB, TMP2, 0, STR_PTR, 0, TMP2, 0);
-    add_jump(compiler, &backtrack->topbacktracks, CMP(SLJIT_LESS_EQUAL, TMP2, 0, TMP1, 0));
+if (early_fail_type == type_fail_range)
+  {
+  /* Range end first, followed by range start. */
+  OP1(SLJIT_MOV, TMP1, 0, SLJIT_MEM1(SLJIT_SP), early_fail_ptr);
+  OP1(SLJIT_MOV, TMP2, 0, SLJIT_MEM1(SLJIT_SP), early_fail_ptr + (int)sizeof(sljit_sw));
+  OP2(SLJIT_SUB, TMP1, 0, TMP1, 0, TMP2, 0);
+  OP2(SLJIT_SUB, TMP2, 0, STR_PTR, 0, TMP2, 0);
+  add_jump(compiler, &backtrack->topbacktracks, CMP(SLJIT_LESS_EQUAL, TMP2, 0, TMP1, 0));
 
-    OP1(SLJIT_MOV, SLJIT_MEM1(SLJIT_SP), early_fail_ptr + (int)sizeof(sljit_sw), STR_PTR, 0);
-    }
+  OP1(SLJIT_MOV, SLJIT_MEM1(SLJIT_SP), early_fail_ptr, STR_PTR, 0);
+  OP1(SLJIT_MOV, SLJIT_MEM1(SLJIT_SP), early_fail_ptr + (int)sizeof(sljit_sw), STR_PTR, 0);
   }
 
 switch(opcode)
diff --git a/src/pcre2_jit_test.c b/src/pcre2_jit_test.c
index f7b9f6d..e1f0bbc 100644
--- a/src/pcre2_jit_test.c
+++ b/src/pcre2_jit_test.c
@@ -354,6 +354,7 @@ static struct regression_test_case regression_test_cases[] = {
 	{ MU, A, 0, 0, "_[ab]+_*a", "_aa" },
 	{ MU, A, 0, 0, "#(A+)#\\d+", "#A#A#0" },
 	{ MU, A, 0, 0, "(?P<size>\\d+)m|M", "4M" },
+	{ M, PCRE2_NEWLINE_CRLF, 0, 0, "\\n?.+#", "\n,\n,#" },
 
 	/* Bracket repeats with limit. */
 	{ MU, A, 0, 0, "(?:(ab){2}){5}M", "abababababababababababM" },
-- 
2.27.0

