613 lines
21 KiB
C
613 lines
21 KiB
C
/* Specialized bits of code needed to support construction and
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destruction of file-scope objects in C++ code.
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Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998,
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1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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Contributed by Ron Guilmette (rfg@monkeys.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* This file is a bit like libgcc2.c in that it is compiled
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multiple times and yields multiple .o files.
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This file is useful on target machines where the object file format
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supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On
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such systems, this file allows us to avoid running collect (or any
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other such slow and painful kludge). Additionally, if the target
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system supports a .init section, this file allows us to support the
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linking of C++ code with a non-C++ main program.
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Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then
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this file *will* make use of the .init section. If that symbol is
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not defined however, then the .init section will not be used.
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Currently, only ELF and COFF are supported. It is likely however that
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ROSE could also be supported, if someone was willing to do the work to
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make whatever (small?) adaptations are needed. (Some work may be
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needed on the ROSE assembler and linker also.)
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This file must be compiled with gcc. */
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/* It is incorrect to include config.h here, because this file is being
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compiled for the target, and hence definitions concerning only the host
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do not apply. */
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/* We include auto-host.h here to get HAVE_GAS_HIDDEN. This is
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supposedly valid even though this is a "target" file. */
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#include "auto-host.h"
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#include "tconfig.h"
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#include "tsystem.h"
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#include "unwind-dw2-fde.h"
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#ifndef FORCE_CODE_SECTION_ALIGN
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# define FORCE_CODE_SECTION_ALIGN
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#endif
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#ifndef CRT_CALL_STATIC_FUNCTION
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# define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
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static void __attribute__((__used__)) \
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call_ ## FUNC (void) \
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{ \
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asm (SECTION_OP); \
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FUNC (); \
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FORCE_CODE_SECTION_ALIGN \
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asm (TEXT_SECTION_ASM_OP); \
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}
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#endif
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#if defined(OBJECT_FORMAT_ELF) && defined(HAVE_LD_EH_FRAME_HDR) \
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&& !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
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&& defined(__GLIBC__) && __GLIBC__ >= 2
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#include <link.h>
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# if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
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|| (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
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# define USE_PT_GNU_EH_FRAME
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# endif
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#endif
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#if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME)
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# define USE_EH_FRAME_REGISTRY
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#endif
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/* We do not want to add the weak attribute to the declarations of these
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routines in unwind-dw2-fde.h because that will cause the definition of
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these symbols to be weak as well.
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This exposes a core issue, how to handle creating weak references vs
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how to create weak definitions. Either we have to have the definition
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of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or
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have a second declaration if we want a function's references to be weak,
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but not its definition.
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Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until
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one thinks about scaling to larger problems -- ie, the condition under
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which TARGET_WEAK_ATTRIBUTE is active will eventually get far too
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complicated.
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So, we take an approach similar to #pragma weak -- we have a second
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declaration for functions that we want to have weak references.
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Neither way is particularly good. */
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/* References to __register_frame_info and __deregister_frame_info should
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be weak in this file if at all possible. */
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extern void __register_frame_info (void *, struct object *)
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TARGET_ATTRIBUTE_WEAK;
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extern void __register_frame_info_bases (void *, struct object *,
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void *, void *)
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TARGET_ATTRIBUTE_WEAK;
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extern void *__deregister_frame_info (void *)
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TARGET_ATTRIBUTE_WEAK;
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extern void *__deregister_frame_info_bases (void *)
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TARGET_ATTRIBUTE_WEAK;
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/* Likewise for _Jv_RegisterClasses. */
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extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK;
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#ifndef OBJECT_FORMAT_MACHO
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#ifdef OBJECT_FORMAT_ELF
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/* Declare a pointer to void function type. */
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typedef void (*func_ptr) (void);
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#define STATIC static
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#else /* OBJECT_FORMAT_ELF */
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#include "gbl-ctors.h"
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#define STATIC
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#endif /* OBJECT_FORMAT_ELF */
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#ifdef CRT_BEGIN
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/* NOTE: In order to be able to support SVR4 shared libraries, we arrange
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to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
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__DTOR_END__ } per root executable and also one set of these symbols
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per shared library. So in any given whole process image, we may have
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multiple definitions of each of these symbols. In order to prevent
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these definitions from conflicting with one another, and in order to
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ensure that the proper lists are used for the initialization/finalization
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of each individual shared library (respectively), we give these symbols
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only internal (i.e. `static') linkage, and we also make it a point to
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refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__
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symbol in crtbegin.o, where they are defined. */
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/* The -1 is a flag to __do_global_[cd]tors indicating that this table
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does not start with a count of elements. */
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#ifdef CTOR_LIST_BEGIN
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CTOR_LIST_BEGIN;
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#elif defined(CTORS_SECTION_ASM_OP)
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/* Hack: force cc1 to switch to .data section early, so that assembling
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__CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
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static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
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asm (CTORS_SECTION_ASM_OP);
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STATIC func_ptr __CTOR_LIST__[1]
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__attribute__ ((__unused__, aligned(sizeof(func_ptr))))
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= { (func_ptr) (-1) };
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#else
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STATIC func_ptr __CTOR_LIST__[1]
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__attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr))))
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= { (func_ptr) (-1) };
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#endif /* __CTOR_LIST__ alternatives */
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#ifdef DTOR_LIST_BEGIN
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DTOR_LIST_BEGIN;
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#elif defined(DTORS_SECTION_ASM_OP)
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asm (DTORS_SECTION_ASM_OP);
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STATIC func_ptr __DTOR_LIST__[1]
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__attribute__ ((aligned(sizeof(func_ptr))))
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= { (func_ptr) (-1) };
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#else
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STATIC func_ptr __DTOR_LIST__[1]
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__attribute__((section(".dtors"), aligned(sizeof(func_ptr))))
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= { (func_ptr) (-1) };
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#endif /* __DTOR_LIST__ alternatives */
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#ifdef EH_FRAME_SECTION_NAME
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/* Stick a label at the beginning of the frame unwind info so we can register
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and deregister it with the exception handling library code. */
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STATIC char __EH_FRAME_BEGIN__[]
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__attribute__((section(EH_FRAME_SECTION_NAME), aligned(4)))
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= { };
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#endif /* EH_FRAME_SECTION_NAME */
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#ifdef JCR_SECTION_NAME
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/* Stick a label at the beginning of the java class registration info
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so we can register them properly. */
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STATIC void *__JCR_LIST__[]
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__attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*))))
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= { };
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#endif /* JCR_SECTION_NAME */
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#ifdef INIT_SECTION_ASM_OP
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#ifdef OBJECT_FORMAT_ELF
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/* Declare the __dso_handle variable. It should have a unique value
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in every shared-object; in a main program its value is zero. The
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object should in any case be protected. This means the instance
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in one DSO or the main program is not used in another object. The
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dynamic linker takes care of this. */
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/* XXX Ideally the following should be implemented using
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__attribute__ ((__visibility__ ("hidden")))
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but the __attribute__ support is not yet there. */
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#ifdef HAVE_GAS_HIDDEN
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asm (".hidden\t__dso_handle");
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#endif
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#ifdef CRTSTUFFS_O
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void *__dso_handle = &__dso_handle;
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#else
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void *__dso_handle = 0;
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#endif
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/* The __cxa_finalize function may not be available so we use only a
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weak declaration. */
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extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
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/* Run all the global destructors on exit from the program. */
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/* Some systems place the number of pointers in the first word of the
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table. On SVR4 however, that word is -1. In all cases, the table is
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null-terminated. On SVR4, we start from the beginning of the list and
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invoke each per-compilation-unit destructor routine in order
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until we find that null.
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Note that this function MUST be static. There will be one of these
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functions in each root executable and one in each shared library, but
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although they all have the same code, each one is unique in that it
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refers to one particular associated `__DTOR_LIST__' which belongs to the
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same particular root executable or shared library file.
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On some systems, this routine is run more than once from the .fini,
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when exit is called recursively, so we arrange to remember where in
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the list we left off processing, and we resume at that point,
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should we be re-invoked. */
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static void __attribute__((used))
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__do_global_dtors_aux (void)
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{
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static func_ptr *p = __DTOR_LIST__ + 1;
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static _Bool completed;
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func_ptr f;
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if (__builtin_expect (completed, 0))
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return;
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#ifdef CRTSTUFFS_O
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if (__cxa_finalize)
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__cxa_finalize (__dso_handle);
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#endif
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while ((f = *p))
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{
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p++;
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f ();
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}
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#ifdef USE_EH_FRAME_REGISTRY
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#if defined(CRT_GET_RFIB_TEXT) || defined(CRT_GET_RFIB_DATA)
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/* If we used the new __register_frame_info_bases interface,
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make sure that we deregister from the same place. */
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if (__deregister_frame_info_bases)
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__deregister_frame_info_bases (__EH_FRAME_BEGIN__);
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#else
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if (__deregister_frame_info)
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__deregister_frame_info (__EH_FRAME_BEGIN__);
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#endif
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#endif
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completed = 1;
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}
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/* Stick a call to __do_global_dtors_aux into the .fini section. */
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CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux)
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#if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
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/* Stick a call to __register_frame_info into the .init section. For some
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reason calls with no arguments work more reliably in .init, so stick the
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call in another function. */
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static void __attribute__((used))
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frame_dummy (void)
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{
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#ifdef USE_EH_FRAME_REGISTRY
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static struct object object;
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#if defined(CRT_GET_RFIB_TEXT) || defined(CRT_GET_RFIB_DATA)
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void *tbase, *dbase;
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#ifdef CRT_GET_RFIB_TEXT
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CRT_GET_RFIB_TEXT (tbase);
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#else
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tbase = 0;
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#endif
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#ifdef CRT_GET_RFIB_DATA
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CRT_GET_RFIB_DATA (dbase);
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#else
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dbase = 0;
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#endif
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if (__register_frame_info_bases)
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__register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase);
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#else
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if (__register_frame_info)
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__register_frame_info (__EH_FRAME_BEGIN__, &object);
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#endif
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#endif /* EH_FRAME_SECTION_NAME */
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#ifdef JCR_SECTION_NAME
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if (__JCR_LIST__[0] && _Jv_RegisterClasses)
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_Jv_RegisterClasses (__JCR_LIST__);
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#endif /* JCR_SECTION_NAME */
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}
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CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy)
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#endif /* EH_FRAME_SECTION_NAME || JCR_SECTION_NAME */
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#else /* OBJECT_FORMAT_ELF */
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/* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
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and once in crtend.o). It must be declared static to avoid a link
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error. Here, we define __do_global_ctors as an externally callable
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function. It is externally callable so that __main can invoke it when
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INVOKE__main is defined. This has the additional effect of forcing cc1
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to switch to the .text section. */
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static void __do_global_ctors_aux (void);
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void
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__do_global_ctors (void)
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{
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#ifdef INVOKE__main
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/* If __main won't actually call __do_global_ctors then it doesn't matter
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what's inside the function. The inside of __do_global_ctors_aux is
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called automatically in that case. And the Alliant fx2800 linker
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crashes on this reference. So prevent the crash. */
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__do_global_ctors_aux ();
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#endif
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}
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asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
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/* On some svr4 systems, the initial .init section preamble code provided in
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crti.o may do something, such as bump the stack, which we have to
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undo before we reach the function prologue code for __do_global_ctors
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(directly below). For such systems, define the macro INIT_SECTION_PREAMBLE
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to expand into the code needed to undo the actions of the crti.o file. */
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#ifdef INIT_SECTION_PREAMBLE
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INIT_SECTION_PREAMBLE;
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#endif
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/* A routine to invoke all of the global constructors upon entry to the
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program. We put this into the .init section (for systems that have
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such a thing) so that we can properly perform the construction of
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file-scope static-storage C++ objects within shared libraries. */
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static void __attribute__((used))
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__do_global_ctors_aux (void) /* prologue goes in .init section */
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{
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FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */
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asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */
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DO_GLOBAL_CTORS_BODY;
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atexit (__do_global_dtors);
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}
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#endif /* OBJECT_FORMAT_ELF */
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#elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
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/* This case is used by the Irix 6 port, which supports named sections but
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not an SVR4-style .fini section. __do_global_dtors can be non-static
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in this case because we protect it with -hidden_symbol. */
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void
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__do_global_dtors (void)
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{
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func_ptr *p, f;
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for (p = __DTOR_LIST__ + 1; (f = *p); p++)
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f ();
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#ifdef USE_EH_FRAME_REGISTRY
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if (__deregister_frame_info)
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__deregister_frame_info (__EH_FRAME_BEGIN__);
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#endif
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}
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#if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
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/* A helper function for __do_global_ctors, which is in crtend.o. Here
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in crtbegin.o, we can reference a couple of symbols not visible there.
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Plus, since we're before libgcc.a, we have no problems referencing
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functions from there. */
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void
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__do_global_ctors_1(void)
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{
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#ifdef USE_EH_FRAME_REGISTRY
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static struct object object;
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if (__register_frame_info)
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__register_frame_info (__EH_FRAME_BEGIN__, &object);
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#endif
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#ifdef JCR_SECTION_NAME
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if (__JCR_LIST__[0] && _Jv_RegisterClasses)
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_Jv_RegisterClasses (__JCR_LIST__);
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#endif
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}
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#endif /* EH_FRAME_SECTION_NAME || JCR_SECTION_NAME */
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#else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
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#error "What are you doing with crtstuff.c, then?"
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#endif
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#elif defined(CRT_END) /* ! CRT_BEGIN */
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/* Put a word containing zero at the end of each of our two lists of function
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addresses. Note that the words defined here go into the .ctors and .dtors
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sections of the crtend.o file, and since that file is always linked in
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last, these words naturally end up at the very ends of the two lists
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contained in these two sections. */
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#ifdef CTOR_LIST_END
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CTOR_LIST_END;
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#elif defined(CTORS_SECTION_ASM_OP)
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/* Hack: force cc1 to switch to .data section early, so that assembling
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__CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
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static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
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asm (CTORS_SECTION_ASM_OP);
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STATIC func_ptr __CTOR_END__[1]
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__attribute__((aligned(sizeof(func_ptr))))
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= { (func_ptr) 0 };
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#else
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STATIC func_ptr __CTOR_END__[1]
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__attribute__((section(".ctors"), aligned(sizeof(func_ptr))))
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= { (func_ptr) 0 };
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#endif
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#ifdef DTOR_LIST_END
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DTOR_LIST_END;
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#elif defined(DTORS_SECTION_ASM_OP)
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asm (DTORS_SECTION_ASM_OP);
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STATIC func_ptr __DTOR_END__[1]
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__attribute__ ((unused, aligned(sizeof(func_ptr))))
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= { (func_ptr) 0 };
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#else
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STATIC func_ptr __DTOR_END__[1]
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__attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr))))
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= { (func_ptr) 0 };
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#endif
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#ifdef EH_FRAME_SECTION_NAME
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/* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
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this would be the 'length' field in a real FDE. */
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STATIC int __FRAME_END__[]
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__attribute__ ((unused, mode(SI), section(EH_FRAME_SECTION_NAME),
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aligned(4)))
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= { 0 };
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#endif /* EH_FRAME_SECTION_NAME */
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#ifdef JCR_SECTION_NAME
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/* Null terminate the .jcr section array. */
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STATIC void *__JCR_END__[1]
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__attribute__ ((unused, section(JCR_SECTION_NAME),
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aligned(sizeof(void *))))
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= { 0 };
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#endif /* JCR_SECTION_NAME */
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#ifdef INIT_SECTION_ASM_OP
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#ifdef OBJECT_FORMAT_ELF
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static void __attribute__((used))
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__do_global_ctors_aux (void)
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|
{
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func_ptr *p;
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for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
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(*p) ();
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}
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/* Stick a call to __do_global_ctors_aux into the .init section. */
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CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux)
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#else /* OBJECT_FORMAT_ELF */
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/* Stick the real initialization code, followed by a normal sort of
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function epilogue at the very end of the .init section for this
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entire root executable file or for this entire shared library file.
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Note that we use some tricks here to get *just* the body and just
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a function epilogue (but no function prologue) into the .init
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section of the crtend.o file. Specifically, we switch to the .text
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section, start to define a function, and then we switch to the .init
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section just before the body code.
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Earlier on, we put the corresponding function prologue into the .init
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section of the crtbegin.o file (which will be linked in first).
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Note that we want to invoke all constructors for C++ file-scope static-
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|
storage objects AFTER any other possible initialization actions which
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may be performed by the code in the .init section contributions made by
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|
other libraries, etc. That's because those other initializations may
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include setup operations for very primitive things (e.g. initializing
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the state of the floating-point coprocessor, etc.) which should be done
|
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before we start to execute any of the user's code. */
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static void
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__do_global_ctors_aux (void) /* prologue goes in .text section */
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|
{
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asm (INIT_SECTION_ASM_OP);
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DO_GLOBAL_CTORS_BODY;
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atexit (__do_global_dtors);
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} /* epilogue and body go in .init section */
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|
|
|
FORCE_CODE_SECTION_ALIGN
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|
asm (TEXT_SECTION_ASM_OP);
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#endif /* OBJECT_FORMAT_ELF */
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#elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
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|
|
/* This case is used by the Irix 6 port, which supports named sections but
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|
not an SVR4-style .init section. __do_global_ctors can be non-static
|
|
in this case because we protect it with -hidden_symbol. */
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|
extern void __do_global_ctors_1(void);
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|
void
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|
__do_global_ctors (void)
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|
{
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|
func_ptr *p;
|
|
#if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
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|
__do_global_ctors_1();
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|
#endif
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|
for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
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|
(*p) ();
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|
}
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|
|
#else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
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|
#error "What are you doing with crtstuff.c, then?"
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|
#endif
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|
|
#else /* ! CRT_BEGIN && ! CRT_END */
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|
#error "One of CRT_BEGIN or CRT_END must be defined."
|
|
#endif
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|
#else /* OBJECT_FORMAT_MACHO */
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|
|
|
/* For Mach-O format executables, we assume that the system's runtime is
|
|
smart enough to handle constructors and destructors, but doesn't have
|
|
an init section (if it can't even handle constructors/destructors
|
|
you should be using INVOKE__main, not crtstuff). All we need to do
|
|
is install/deinstall the frame information for exceptions. We do this
|
|
by putting a constructor in crtbegin.o and a destructor in crtend.o.
|
|
|
|
crtend.o also puts in the terminating zero in the frame information
|
|
segment. */
|
|
|
|
/* The crtstuff for other object formats use the symbol __EH_FRAME_BEGIN__
|
|
to figure out the start of the exception frame, but here we use
|
|
getsectbynamefromheader to find this value. Either method would work,
|
|
but this method avoids creating any global symbols, which seems
|
|
cleaner. */
|
|
|
|
#include <mach-o/ldsyms.h>
|
|
extern const struct section *
|
|
getsectbynamefromheader (const struct mach_header *,
|
|
const char *, const char *);
|
|
|
|
#ifdef CRT_BEGIN
|
|
|
|
static void __reg_frame_ctor (void) __attribute__ ((constructor));
|
|
|
|
static void
|
|
__reg_frame_ctor (void)
|
|
{
|
|
static struct object object;
|
|
const struct section *eh_frame;
|
|
|
|
eh_frame = getsectbynamefromheader (&_mh_execute_header,
|
|
"__TEXT", "__eh_frame");
|
|
__register_frame_info ((void *) eh_frame->addr, &object);
|
|
}
|
|
|
|
#elif defined(CRT_END)
|
|
|
|
static void __dereg_frame_dtor (void) __attribute__ ((destructor));
|
|
|
|
static void
|
|
__dereg_frame_dtor (void)
|
|
{
|
|
const struct section *eh_frame;
|
|
|
|
eh_frame = getsectbynamefromheader (&_mh_execute_header,
|
|
"__TEXT", "__eh_frame");
|
|
__deregister_frame_info ((void *) eh_frame->addr);
|
|
}
|
|
|
|
/* Terminate the frame section with a final zero. */
|
|
STATIC int __FRAME_END__[]
|
|
__attribute__ ((unused, mode(SI), section(EH_FRAME_SECTION_NAME),
|
|
aligned(4)))
|
|
= { 0 };
|
|
|
|
#else /* ! CRT_BEGIN && ! CRT_END */
|
|
#error "One of CRT_BEGIN or CRT_END must be defined."
|
|
#endif
|
|
|
|
#endif /* OBJECT_FORMAT_MACHO */
|