![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to crtstuff.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [GCC 2.x] / gcc|
Return to crtstuff.c CVS log | Up to [GCC 2.x] / gcc |
1.1 root 1: /* Specialized bits of code needed to support construction and
2: destruction of file-scope objects in C++ code.
3:
4: Written by Ron Guilmette ([email protected]) with help from Richard Stallman.
5:
6: Copyright (C) 1991 Free Software Foundation, Inc.
7:
8: This file is part of GNU CC.
9:
10: GNU CC is free software; you can redistribute it and/or modify
11: it under the terms of the GNU General Public License as published by
12: the Free Software Foundation; either version 2, or (at your option)
13: any later version.
14:
15: GNU CC is distributed in the hope that it will be useful,
16: but WITHOUT ANY WARRANTY; without even the implied warranty of
17: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: GNU General Public License for more details.
19:
20: You should have received a copy of the GNU General Public License
21: along with GNU CC; see the file COPYING. If not, write to
22: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23:
24: /* As a special exception, if you link this library with files
25: compiled with GCC to produce an executable, this does not cause
26: the resulting executable to be covered by the GNU General Public License.
27: This exception does not however invalidate any other reasons why
28: the executable file might be covered by the GNU General Public License. */
29:
30: /* This file is a bit like libgcc1.c/libgcc2.c in that it is compiled
31: multiple times and yields multiple .o files.
32:
33: This file is useful on target machines where the object file format
34: supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On
35: such systems, this file allows us to avoid running collect (or any
36: other such slow and painful kludge). Additionally, if the target
37: system supports a .init section, this file allows us to support the
38: linking of C++ code with a non-C++ main program.
39:
40: Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then
41: this file *will* make use of the .init section. If that symbol is
42: not defined however, then the .init section will not be used.
43:
44: Currently, only ELF is actually supported.
45: The other formats probably need just alternative macro definitions.
46:
47: This file must be compiled with gcc. */
48:
49: /* It is incorrect to include config.h here, because this file is being
50: compiled for the target, and hence definitions concerning only the host
51: do not apply. */
52:
53: #include "tm.h"
54:
55: #ifndef CTORS_SECTION_ASM_OP
1.1.1.2 ! root 56: #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"a\",@progbits"
1.1 root 57: #endif
58: #ifndef DTORS_SECTION_ASM_OP
1.1.1.2 ! root 59: #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"a\",@progbits"
1.1 root 60: #endif
61:
62: #include "gbl-ctors.h"
63:
1.1.1.2 ! root 64: #ifndef ON_EXIT
1.1 root 65: #define ON_EXIT(a, b)
66: #endif
67:
68: #ifdef CRT_BEGIN
69:
70: #ifdef INIT_SECTION_ASM_OP
71:
1.1.1.2 ! root 72: /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
! 73: and once in crtend.o). It must be declared static to aviod a link
! 74: error. Here, we define __do_global_ctors as an externally callable
! 75: function. It is externally callable so that __main can invoke it when
! 76: INVOKE__main is defined. This has the additional effect of forcing cc1
! 77: to switch to the .text section. */
! 78: static void __do_global_ctors_aux ();
! 79: void __do_global_ctors () { __do_global_ctors_aux (); }
1.1 root 80:
81: asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
82:
1.1.1.2 ! root 83: /* On some svr4 systems, the .init section preamble code provided in
! 84: crti.o may do some evil things which we have to undo before we reach
! 85: the function prologue code for __do_global_ctors (directly below).
! 86: For such systems, define the macro INIT_SECTION_PREAMBLE to
! 87: expand into the code needed to undo the actions of the crti.o file. */
! 88:
! 89: #ifdef INIT_SECTION_PREAMBLE
! 90: INIT_SECTION_PREAMBLE;
! 91: #endif
! 92:
1.1 root 93: /* A routine to invoke all of the global constructors upon entry to the
94: program. We put this into the .init section (for systems that have
95: such a thing) so that we can properly perform the construction of
96: file-scope static-storage C++ objects within shared libraries. */
97:
98: static void
1.1.1.2 ! root 99: __do_global_ctors_aux () /* prologue goes in .init section */
1.1 root 100: {
101: asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */
102: DO_GLOBAL_CTORS_BODY;
1.1.1.2 ! root 103: ON_EXIT (__do_global_dtors, 0);
1.1 root 104: }
105:
106: #endif /* defined(INIT_SECTION_ASM_OP) */
107:
108: /* Force cc1 to switch to .data section. */
109: static func_ptr force_to_data[0] = { };
110:
111: /* The -1 is a flag to __do_global_[cd]tors
112: indicating that this table does not start with a count of elements. */
1.1.1.2 ! root 113: #ifdef CTOR_LIST_BEGIN
! 114: CTOR_LIST_BEGIN;
! 115: #else
1.1 root 116: asm (CTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
117: func_ptr __CTOR_LIST__[1] = { (func_ptr) (-1) };
1.1.1.2 ! root 118: #endif
1.1 root 119:
1.1.1.2 ! root 120: #ifdef DTOR_LIST_BEGIN
! 121: DTOR_LIST_BEGIN;
! 122: #else
1.1 root 123: asm (DTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
124: func_ptr __DTOR_LIST__[1] = { (func_ptr) (-1) };
1.1.1.2 ! root 125: #endif
1.1 root 126:
127: #endif /* defined(CRT_BEGIN) */
128:
129: #ifdef CRT_END
130:
131: #ifdef INIT_SECTION_ASM_OP
132:
133: /* A routine to invoke all of the global constructors upon entry to the
134: program. We put this into the .init section (for systems that have
135: such a thing) so that we can properly perform the construction of
136: file-scope static-storage C++ objects within shared libraries.
137:
138: This must be virtually identical to the one above so that we can
139: insure that the function prologue from the one above works correctly
140: with the epilogue from this one. (They will both go into the .init
141: section as the first and last things (respectively) that the linker
142: will put in that section.)
143: */
144:
145: static void
1.1.1.2 ! root 146: __do_global_ctors_aux () /* prologue goes in .text section */
1.1 root 147: {
148: asm (INIT_SECTION_ASM_OP);
149: DO_GLOBAL_CTORS_BODY;
1.1.1.2 ! root 150: ON_EXIT (__do_global_dtors, 0);
1.1 root 151: } /* epilogue and body go in .init section */
152:
153: #endif /* defined(INIT_SECTION_ASM_OP) */
154:
155: /* Force cc1 to switch to .data section. */
156: static func_ptr force_to_data[0] = { };
157:
1.1.1.2 ! root 158: #ifdef CTOR_LIST_END
! 159: CTOR_LIST_END;
! 160: #else
1.1 root 161: asm (CTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
162: func_ptr __CTOR_END__[1] = { (func_ptr) 0 };
1.1.1.2 ! root 163: #endif
1.1 root 164:
1.1.1.2 ! root 165: #ifdef DTOR_LIST_END
! 166: DTOR_LIST_END;
! 167: #else
1.1 root 168: asm (DTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
169: func_ptr __DTOR_END__[1] = { (func_ptr) 0 };
1.1.1.2 ! root 170: #endif
1.1 root 171:
172: #endif /* defined(CRT_END) */
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.