File 6543-Lower-size-limit-for-integers-to-4-Mbit.patch of Package erlang

Overview Repositories Revisions Requests Users Attributes Meta

File 6543-Lower-size-limit-for-integers-to-4-Mbit.patch of Package erlang (Revision b4f72044e1af8cfe32130ab849a401a1)

Currently displaying revision b4f72044e1af8cfe32130ab849a401a1 , Show latest

From b5540a3a82412a06b9243805847b7e4995dd5843 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Mon, 19 Jun 2023 13:16:20 +0200
Subject: [PATCH 3/6] Lower size limit for integers to 4 Mbit

This new 4 Mbit limit should still be sufficiently large for practical
applications.
---
 erts/emulator/beam/erl_bif_info.c      | 5 +++++
 erts/emulator/beam/erl_term.h          | 7 ++++++-
 erts/emulator/test/big_SUITE.erl       | 4 +---
 erts/emulator/test/exception_SUITE.erl | 4 +---
 4 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index d5e598515c..564c3b0f28 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -3245,6 +3245,11 @@ BIF_RETTYPE system_info_1(BIF_ALIST_1)
 #endif
     } else if (ERTS_IS_ATOM_STR("system_logger", BIF_ARG_1)) {
         BIF_RET(erts_get_system_logger());
+    } else if (ERTS_IS_ATOM_STR("max_integer", BIF_ARG_1)) {
+        Eterm *hp = HAlloc(BIF_P, BIG_ARITY_MAX+1);
+        hp[0] = make_pos_bignum_header(BIG_ARITY_MAX);
+        sys_memset(hp + 1, 0xff, BIG_ARITY_MAX*sizeof(Eterm));
+        BIF_RET(make_big(hp));
     }
 
     BIF_ERROR(BIF_P, BADARG);
diff --git a/erts/emulator/beam/erl_term.h b/erts/emulator/beam/erl_term.h
index 490fe1f1d1..bcb9daa4d1 100644
--- a/erts/emulator/beam/erl_term.h
+++ b/erts/emulator/beam/erl_term.h
@@ -411,7 +411,12 @@ _ET_DECLARE_CHECKED(Eterm,bignum_header_neg,Eterm)
 #define _unchecked_bignum_header_arity(x)	_unchecked_header_arity((x))
 _ET_DECLARE_CHECKED(Uint,bignum_header_arity,Eterm)
 #define bignum_header_arity(x)	_ET_APPLY(bignum_header_arity,(x))
-#define BIG_ARITY_MAX		((1 << 19)-1)
+
+#if defined(ARCH_64)
+#  define BIG_ARITY_MAX		((1 << 16)-1)
+#else
+#  define BIG_ARITY_MAX		((1 << 17)-1)
+#endif
 #define make_big(x)	make_boxed((x))
 #define is_big(x)	(is_boxed((x)) && _is_bignum_header(*boxed_val((x))))
 #define is_not_big(x)	(!is_big((x)))
diff --git a/erts/emulator/test/big_SUITE.erl b/erts/emulator/test/big_SUITE.erl
index a48a14357a..794902280a 100644
--- a/erts/emulator/test/big_SUITE.erl
+++ b/erts/emulator/test/big_SUITE.erl
@@ -376,9 +376,7 @@ system_limit(Config) when is_list(Config) ->
     ok.
 
 maxbig() ->
-    %% We assume that the maximum arity is (1 bsl 19) - 1.
-    Ws = erlang:system_info(wordsize),
-    (((1 bsl ((16777184 * (Ws div 4))-1)) - 1) bsl 1) + 1.
+    erlang:system_info(max_integer).
 
 toobig(Config) when is_list(Config) ->
     {'EXIT',{{badmatch,_},_}} = (catch toobig()),
diff --git a/erts/emulator/test/exception_SUITE.erl b/erts/emulator/test/exception_SUITE.erl
index 80fc35d2be..e78c2e337b 100644
--- a/erts/emulator/test/exception_SUITE.erl
+++ b/erts/emulator/test/exception_SUITE.erl
@@ -310,9 +310,7 @@ top_of_stacktrace(Conf) when is_list(Conf) ->
     ok.
 
 maxbig() ->
-    %% We assume that the maximum arity is (1 bsl 19) - 1.
-    Ws = erlang:system_info(wordsize),
-    (((1 bsl ((16777184 * (Ws div 4))-1)) - 1) bsl 1) + 1.
+    erlang:system_info(max_integer).
 
 maxbig_gc() ->
     Maxbig = maxbig(),
-- 
2.35.3

Places

File 6543-Lower-size-limit-for-integers-to-4-Mbit.patch of Package erlang (Revision b4f72044e1af8cfe32130ab849a401a1)

Places