File 0847-Move-the-check-for-stack-direction-to-utils.c.patch of Package erlang

From 322d954a38fe86137045d074009f5329d04ff0a8 Mon Sep 17 00:00:00 2001
From: Sergei Golovan <sgolovan@gmail.com>
Date: Wed, 2 Oct 2019 11:06:51 +0300
Subject: [PATCH 4/4] Move the check for stack direction to utils.c

---
 erts/emulator/beam/erl_bif_re.c | 12 +-----------
 erts/emulator/beam/global.h     |  1 +
 erts/emulator/beam/utils.c      |  8 ++++++++
 3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/erts/emulator/beam/erl_bif_re.c b/erts/emulator/beam/erl_bif_re.c
index d22ba1ce11..c66f688f1c 100644
--- a/erts/emulator/beam/erl_bif_re.c
+++ b/erts/emulator/beam/erl_bif_re.c
@@ -90,16 +90,6 @@ stack_guard_upwards(void)
     return erts_check_above_limit(&c, limit - ERTS_PCRE_STACK_MARGIN);
 }
 
-static ERTS_NOINLINE
-int stack_grows_downwards(char *prev_c)
-{
-    char c;
-    if (erts_check_below_limit(&c, prev_c))
-        return 1;
-    else
-        return 0;
-}
-
 void erts_init_bif_re(void)
 {
     char c;
@@ -107,7 +97,7 @@ void erts_init_bif_re(void)
     erts_pcre_free = &erts_erts_pcre_free;
     erts_pcre_stack_malloc = &erts_erts_pcre_stack_malloc;
     erts_pcre_stack_free = &erts_erts_pcre_stack_free;
-    if (stack_grows_downwards(&c))
+    if (erts_check_if_stack_grows_downwards(&c))
         erts_pcre_stack_guard = stack_guard_downwards;
     else
         erts_pcre_stack_guard = stack_guard_upwards;
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index 40c65461bc..5594c372db 100644
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -1253,6 +1253,7 @@ void *erts_calc_stacklimit(char *prev_c, UWord stacksize) ERTS_NOINLINE;
 int erts_check_below_limit(char *ptr, char *limit) ERTS_NOINLINE;
 int erts_check_above_limit(char *ptr, char *limit) ERTS_NOINLINE;
 void *erts_ptr_id(void *ptr) ERTS_NOINLINE;
+int erts_check_if_stack_grows_downwards(char *ptr) ERTS_NOINLINE;
 
 Eterm store_external_or_ref_in_proc_(Process *, Eterm);
 Eterm store_external_or_ref_(Uint **, ErlOffHeap*, Eterm);
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index 0bbae65e28..9fb37f77fc 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -4789,3 +4789,11 @@ erts_ptr_id(void *ptr)
     return ptr;
 }
 
+int erts_check_if_stack_grows_downwards(char *ptr)
+{
+    char c;
+    if (erts_check_below_limit(&c, ptr))
+        return 1;
+    else
+        return 0;
+}
-- 
2.16.4