From 4c7e7cb362a1589b1a326f3f69bc918430e82bfd Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Wed, 6 May 2015 12:27:35 +0100
Subject: [PATCH] Some pcre distributions are brain damaged.

---
 CMakeLists.txt       | 30 ++++++++++++++++++++++++++++++
 config.h.in          |  1 +
 src/libutil/regexp.c |  8 ++++----
 3 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d5a7677e0..5136213d9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -792,6 +792,36 @@ CHECK_SYMBOL_EXISTS(sched_yield "sched.h" HAVE_SCHED_YIELD)
 CHECK_SYMBOL_EXISTS(__get_cpuid "cpuid.h" HAVE_GET_CPUID)
 CHECK_SYMBOL_EXISTS(PCRE_CONFIG_JIT "pcre.h" HAVE_PCRE_JIT)
 
+# Some PCRE implementations are lacking of pcre_jit_exec fast path
+SET(_PCRE_FAST_TEST "
+#include \"pcre.h\"
+int main (void) 
+{
+	int rc;
+	int ovector[30];
+	pcre *re;
+	pcre_extra *extra;
+	pcre_jit_stack *jit_stack;
+	
+	re = pcre_compile(\"abc\", 0, NULL, NULL, NULL);
+	extra = pcre_study(re, PCRE_STUDY_JIT_COMPILE, NULL);
+	jit_stack = pcre_jit_stack_alloc(32*1024, 512*1024);
+	pcre_assign_jit_stack(extra, NULL, jit_stack);
+	rc = pcre_jit_exec(re, extra, \"abc\", 3, 0, 0, ovector, 30, jit_stack);
+	
+	return rc;
+}
+")
+
+SET(CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES} -lpcre")
+CHECK_C_SOURCE_COMPILES("${_PCRE_FAST_TEST}" _PCRE_JIT_FAST)
+IF(_PCRE_JIT_FAST)
+	SET(HAVE_PCRE_JIT_FAST 1)
+	MESSAGE(STATUS "pcre_jit_exec is supported")
+ELSE(_PCRE_JIT_FAST)
+	MESSAGE(STATUS "pcre_jit_exec is -NOT- supported")
+ENDIF(_PCRE_JIT_FAST)
+
 FILE(WRITE ${CMAKE_BINARY_DIR}/pthread_setpshared.c "
 #include <pthread.h>
 #include <stdlib.h>
diff --git a/config.h.in b/config.h.in
index 5e262235a..211b4bba9 100644
--- a/config.h.in
+++ b/config.h.in
@@ -225,6 +225,7 @@
 #cmakedefine HAVE_EXPLICIT_BZERO 1
 #cmakedefine HAVE_WEAK_SYMBOLS   1
 #cmakedefine HAVE_PCRE_JIT       1
+#cmakedefine HAVE_PCRE_JIT_FAST  1
 #cmakedefine HAVE_GET_CPUID      1
 #cmakedefine HAVE_CPUID_H        1
 
diff --git a/src/libutil/regexp.c b/src/libutil/regexp.c
index c3b542fd9..6f7d07f6f 100644
--- a/src/libutil/regexp.c
+++ b/src/libutil/regexp.c
@@ -327,7 +327,7 @@ rspamd_regexp_search (rspamd_regexp_t *re, const gchar *text, gsize len,
 {
 	pcre *r;
 	pcre_extra *ext;
-#if defined(HAVE_PCRE_JIT) && (PCRE_MAJOR == 8 && PCRE_MINOR >= 32)
+#if defined(HAVE_PCRE_JIT) && defined(HAVE_PCRE_JIT_FAST)
 	pcre_jit_stack *st = NULL;
 #endif
 	const gchar *mt;
@@ -362,7 +362,7 @@ rspamd_regexp_search (rspamd_regexp_t *re, const gchar *text, gsize len,
 	if ((re->flags & RSPAMD_REGEXP_FLAG_RAW) || raw) {
 		r = re->raw_re;
 		ext = re->raw_extra;
-#if defined(HAVE_PCRE_JIT) && (PCRE_MAJOR == 8 && PCRE_MINOR >= 32)
+#if defined(HAVE_PCRE_JIT) && defined(HAVE_PCRE_JIT_FAST)
 		st = re->raw_jstack;
 #endif
 	}
@@ -370,7 +370,7 @@ rspamd_regexp_search (rspamd_regexp_t *re, const gchar *text, gsize len,
 		match_flags |= PCRE_NO_UTF8_CHECK;
 		r = re->re;
 		ext = re->extra;
-#if defined(HAVE_PCRE_JIT) && (PCRE_MAJOR == 8 && PCRE_MINOR >= 32)
+#if defined(HAVE_PCRE_JIT) && defined(HAVE_PCRE_JIT_FAST)
 		st = re->jstack;
 #endif
 	}
@@ -379,7 +379,7 @@ rspamd_regexp_search (rspamd_regexp_t *re, const gchar *text, gsize len,
 
 	if (!(re->flags & RSPAMD_REGEXP_FLAG_NOOPT)) {
 #ifdef HAVE_PCRE_JIT
-# if (PCRE_MAJOR == 8 && PCRE_MINOR >= 32)
+# ifdef HAVE_PCRE_JIT_FAST
 		/* XXX: flags seems to be broken with jit fast path */
 		g_assert (remain > 0);
 		g_assert (mt != NULL);
-- 
2.39.5