From patchwork Sat Aug 20 20:05:25 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "H.J. Lu" X-Patchwork-Id: 110786 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from sourceware.org (server1.sourceware.org [209.132.180.131]) by ozlabs.org (Postfix) with SMTP id 7C966B6F7B for ; Sun, 21 Aug 2011 06:05:47 +1000 (EST) Received: (qmail 1846 invoked by alias); 20 Aug 2011 20:05:43 -0000 Received: (qmail 1837 invoked by uid 22791); 20 Aug 2011 20:05:41 -0000 X-SWARE-Spam-Status: No, hits=-2.4 required=5.0 tests=AWL, BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, RCVD_IN_DNSWL_LOW X-Spam-Check-By: sourceware.org Received: from mail-qw0-f47.google.com (HELO mail-qw0-f47.google.com) (209.85.216.47) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sat, 20 Aug 2011 20:05:26 +0000 Received: by qwh5 with SMTP id 5so2663858qwh.20 for ; Sat, 20 Aug 2011 13:05:25 -0700 (PDT) MIME-Version: 1.0 Received: by 10.229.114.82 with SMTP id d18mr377916qcq.110.1313870725886; Sat, 20 Aug 2011 13:05:25 -0700 (PDT) Received: by 10.229.29.7 with HTTP; Sat, 20 Aug 2011 13:05:25 -0700 (PDT) In-Reply-To: <20110819145522.GF2687@tyan-ft48-01.lab.bos.redhat.com> References: <20110722123042.GB2687@tyan-ft48-01.lab.bos.redhat.com> <20110819081733.GB2687@tyan-ft48-01.lab.bos.redhat.com> <20110819145522.GF2687@tyan-ft48-01.lab.bos.redhat.com> Date: Sat, 20 Aug 2011 13:05:25 -0700 Message-ID: Subject: Re: PING: PATCH: PR target/46770: Use .init_array/.fini_array sections From: "H.J. Lu" To: Jakub Jelinek Cc: GCC Patches X-IsSubscribed: yes Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Delivered-To: mailing list gcc-patches@gcc.gnu.org On Fri, Aug 19, 2011 at 7:55 AM, Jakub Jelinek wrote: > On Fri, Aug 19, 2011 at 07:47:40AM -0700, H.J. Lu wrote: >> 2011-08-19  H.J. Lu   >> >>       PR target/46770 >>       * config.gcc (tm_file): Add initfini-array.h if >>       .init_arary/.fini_array supported. > > s/arary/array/ > > Ok if nobody objects within 24 hours, but please watch for any fallouts. > >        Jakub > This is the patch I checked in. I moved default_elf_init_array_asm_out_constructor and default_elf_fini_array_asm_out_destructor from config/initfini-array.h to output.h so that we won't get warnings if .init_arrary/.fini_array sections aren't enabled. Thanks. diff --git a/gcc/config.gcc b/gcc/config.gcc index b92ce3d..7f29213 100644 --- a/gcc/config.gcc +++ b/gcc/config.gcc @@ -3058,6 +3058,11 @@ if test x$with_schedule = x; then esac fi +# Support --enable-initfini-array. +if test x$enable_initfini_array = xyes; then + tm_file="${tm_file} initfini-array.h" +fi + # Validate and mark as valid any --with options supported # by this target. In order to use a particular --with option # you must list it in supported_defaults; validating the value diff --git a/gcc/config/initfini-array.h b/gcc/config/initfini-array.h new file mode 100644 index 0000000..8aaadf6 --- /dev/null +++ b/gcc/config/initfini-array.h @@ -0,0 +1,37 @@ +/* Definitions for ELF systems with .init_array/.fini_array section + support. + Copyright (C) 2011 + Free Software Foundation, Inc. + + This file is part of GCC. + + GCC is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3, or (at your + option) any later version. + + GCC is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public + License for more details. + + You should have received a copy of the GNU General Public License + along with GCC; see the file COPYING3. If not see + . */ + +#define USE_INITFINI_ARRAY + +#undef INIT_SECTION_ASM_OP +#undef FINI_SECTION_ASM_OP + +#undef INIT_ARRAY_SECTION_ASM_OP +#define INIT_ARRAY_SECTION_ASM_OP + +#undef FINI_ARRAY_SECTION_ASM_OP +#define FINI_ARRAY_SECTION_ASM_OP + +/* Use .init_array/.fini_array section for constructors and destructors. */ +#undef TARGET_ASM_CONSTRUCTOR +#define TARGET_ASM_CONSTRUCTOR default_elf_init_array_asm_out_constructor +#undef TARGET_ASM_DESTRUCTOR +#define TARGET_ASM_DESTRUCTOR default_elf_fini_array_asm_out_destructor diff --git a/gcc/crtstuff.c b/gcc/crtstuff.c index b65f490..010d472 100644 --- a/gcc/crtstuff.c +++ b/gcc/crtstuff.c @@ -1,7 +1,8 @@ /* Specialized bits of code needed to support construction and destruction of file-scope objects in C++ code. Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 - 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc. + 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 + Free Software Foundation, Inc. Contributed by Ron Guilmette (rfg@monkeys.com). This file is part of GCC. @@ -189,6 +190,9 @@ typedef void (*func_ptr) (void); refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ symbol in crtbegin.o, where they are defined. */ +/* No need for .ctors/.dtors section if linker can place them in + .init_array/.fini_array section. */ +#ifndef USE_INITFINI_ARRAY /* The -1 is a flag to __do_global_[cd]tors indicating that this table does not start with a count of elements. */ #ifdef CTOR_LIST_BEGIN @@ -219,6 +223,7 @@ STATIC func_ptr __DTOR_LIST__[1] __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) = { (func_ptr) (-1) }; #endif /* __DTOR_LIST__ alternatives */ +#endif /* USE_INITFINI_ARRAY */ #ifdef USE_EH_FRAME_REGISTRY /* Stick a label at the beginning of the frame unwind info so we can register @@ -489,6 +494,9 @@ __do_global_ctors_1(void) #elif defined(CRT_END) /* ! CRT_BEGIN */ +/* No need for .ctors/.dtors section if linker can place them in + .init_array/.fini_array section. */ +#ifndef USE_INITFINI_ARRAY /* Put a word containing zero at the end of each of our two lists of function addresses. Note that the words defined here go into the .ctors and .dtors sections of the crtend.o file, and since that file is always linked in @@ -534,6 +542,7 @@ STATIC func_ptr __DTOR_END__[1] __attribute__((used, section(".dtors"), aligned(sizeof(func_ptr)))) = { (func_ptr) 0 }; #endif +#endif /* USE_INITFINI_ARRAY */ #ifdef EH_FRAME_SECTION_NAME /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; diff --git a/gcc/output.h b/gcc/output.h index c668d35..6b7c4b8 100644 --- a/gcc/output.h +++ b/gcc/output.h @@ -654,6 +654,8 @@ extern void file_end_indicate_split_stack (void); extern void default_elf_asm_output_external (FILE *file, tree, const char *); +extern void default_elf_init_array_asm_out_constructor (rtx, int); +extern void default_elf_fini_array_asm_out_destructor (rtx, int); extern int maybe_assemble_visibility (tree); extern int default_address_cost (rtx, bool); diff --git a/gcc/varasm.c b/gcc/varasm.c index ca56813..218baf3 100644 --- a/gcc/varasm.c +++ b/gcc/varasm.c @@ -7352,4 +7352,62 @@ make_debug_expr_from_rtl (const_rtx exp) return dval; } +static GTY(()) section *elf_init_array_section; +static GTY(()) section *elf_fini_array_section; + +static section * +get_elf_initfini_array_priority_section (int priority, + bool constructor_p) +{ + section *sec; + if (priority != DEFAULT_INIT_PRIORITY) + { + char buf[18]; + sprintf (buf, "%s.%.5u", + constructor_p ? ".init_array" : ".fini_array", + priority); + sec = get_section (buf, SECTION_WRITE, NULL_TREE); + } + else + { + if (constructor_p) + { + if (elf_init_array_section == NULL) + elf_init_array_section + = get_unnamed_section (0, output_section_asm_op, + "\t.section\t.init_array"); + sec = elf_init_array_section; + } + else + { + if (elf_fini_array_section == NULL) + elf_fini_array_section + = get_unnamed_section (0, output_section_asm_op, + "\t.section\t.fini_array"); + sec = elf_fini_array_section; + } + } + return sec; +} + +/* Use .init_array section for constructors. */ + +void +default_elf_init_array_asm_out_constructor (rtx symbol, int priority) +{ + section *sec = get_elf_initfini_array_priority_section (priority, + true); + assemble_addr_to_section (symbol, sec); +} + +/* Use .fini_array section for destructors. */ + +void +default_elf_fini_array_asm_out_destructor (rtx symbol, int priority) +{ + section *sec = get_elf_initfini_array_priority_section (priority, + false); + assemble_addr_to_section (symbol, sec); +} + #include "gt-varasm.h"