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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:
1.1.1.3 ! root 44: Currently, only ELF and COFF are supported. It is likely however that
! 45: ROSE could also be supported, if someone was willing to do the work to
! 46: make whatever (small?) adaptations are needed. (Some work may be
! 47: needed on the ROSE assembler and linker also.)
1.1 root 48:
49: This file must be compiled with gcc. */
50:
51: /* It is incorrect to include config.h here, because this file is being
52: compiled for the target, and hence definitions concerning only the host
53: do not apply. */
54:
55: #include "tm.h"
56:
57: #ifndef CTORS_SECTION_ASM_OP
1.1.1.2 root 58: #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"a\",@progbits"
1.1 root 59: #endif
60: #ifndef DTORS_SECTION_ASM_OP
1.1.1.2 root 61: #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"a\",@progbits"
1.1 root 62: #endif
63:
64: #include "gbl-ctors.h"
65:
1.1.1.2 root 66: #ifndef ON_EXIT
1.1 root 67: #define ON_EXIT(a, b)
68: #endif
69:
70: #ifdef CRT_BEGIN
71:
72: #ifdef INIT_SECTION_ASM_OP
73:
1.1.1.2 root 74: /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
1.1.1.3 ! root 75: and once in crtend.o). It must be declared static to avoid a link
1.1.1.2 root 76: error. Here, we define __do_global_ctors as an externally callable
77: function. It is externally callable so that __main can invoke it when
78: INVOKE__main is defined. This has the additional effect of forcing cc1
79: to switch to the .text section. */
80: static void __do_global_ctors_aux ();
1.1.1.3 ! root 81: void __do_global_ctors ()
! 82: {
! 83: #ifdef INVOKE__main /* If __main won't actually call __do_global_ctors
! 84: then it doesn't matter what's inside the function.
! 85: The inside of __do_global_ctors_aux is called
! 86: automatically in that case.
! 87: And the Alliant fx2800 linker crashes
! 88: on this reference. So prevent the crash. */
! 89: __do_global_ctors_aux ();
! 90: #endif
! 91: }
1.1 root 92:
93: asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
94:
1.1.1.2 root 95: /* On some svr4 systems, the .init section preamble code provided in
96: crti.o may do some evil things which we have to undo before we reach
97: the function prologue code for __do_global_ctors (directly below).
98: For such systems, define the macro INIT_SECTION_PREAMBLE to
99: expand into the code needed to undo the actions of the crti.o file. */
100:
101: #ifdef INIT_SECTION_PREAMBLE
102: INIT_SECTION_PREAMBLE;
103: #endif
104:
1.1 root 105: /* A routine to invoke all of the global constructors upon entry to the
106: program. We put this into the .init section (for systems that have
107: such a thing) so that we can properly perform the construction of
108: file-scope static-storage C++ objects within shared libraries. */
109:
110: static void
1.1.1.2 root 111: __do_global_ctors_aux () /* prologue goes in .init section */
1.1 root 112: {
113: asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */
114: DO_GLOBAL_CTORS_BODY;
1.1.1.2 root 115: ON_EXIT (__do_global_dtors, 0);
1.1 root 116: }
117:
118: #endif /* defined(INIT_SECTION_ASM_OP) */
119:
120: /* Force cc1 to switch to .data section. */
121: static func_ptr force_to_data[0] = { };
122:
123: /* The -1 is a flag to __do_global_[cd]tors
124: indicating that this table does not start with a count of elements. */
1.1.1.2 root 125: #ifdef CTOR_LIST_BEGIN
126: CTOR_LIST_BEGIN;
127: #else
1.1 root 128: asm (CTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
129: func_ptr __CTOR_LIST__[1] = { (func_ptr) (-1) };
1.1.1.2 root 130: #endif
1.1 root 131:
1.1.1.2 root 132: #ifdef DTOR_LIST_BEGIN
133: DTOR_LIST_BEGIN;
134: #else
1.1 root 135: asm (DTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
136: func_ptr __DTOR_LIST__[1] = { (func_ptr) (-1) };
1.1.1.2 root 137: #endif
1.1 root 138:
139: #endif /* defined(CRT_BEGIN) */
140:
141: #ifdef CRT_END
142:
143: #ifdef INIT_SECTION_ASM_OP
144:
145: /* A routine to invoke all of the global constructors upon entry to the
146: program. We put this into the .init section (for systems that have
147: such a thing) so that we can properly perform the construction of
148: file-scope static-storage C++ objects within shared libraries.
149:
150: This must be virtually identical to the one above so that we can
151: insure that the function prologue from the one above works correctly
152: with the epilogue from this one. (They will both go into the .init
153: section as the first and last things (respectively) that the linker
154: will put in that section.)
155: */
156:
157: static void
1.1.1.2 root 158: __do_global_ctors_aux () /* prologue goes in .text section */
1.1 root 159: {
160: asm (INIT_SECTION_ASM_OP);
161: DO_GLOBAL_CTORS_BODY;
1.1.1.2 root 162: ON_EXIT (__do_global_dtors, 0);
1.1 root 163: } /* epilogue and body go in .init section */
164:
165: #endif /* defined(INIT_SECTION_ASM_OP) */
166:
167: /* Force cc1 to switch to .data section. */
168: static func_ptr force_to_data[0] = { };
169:
1.1.1.2 root 170: #ifdef CTOR_LIST_END
171: CTOR_LIST_END;
172: #else
1.1 root 173: asm (CTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
174: func_ptr __CTOR_END__[1] = { (func_ptr) 0 };
1.1.1.2 root 175: #endif
1.1 root 176:
1.1.1.2 root 177: #ifdef DTOR_LIST_END
178: DTOR_LIST_END;
179: #else
1.1 root 180: asm (DTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
181: func_ptr __DTOR_END__[1] = { (func_ptr) 0 };
1.1.1.2 root 182: #endif
1.1 root 183:
184: #endif /* defined(CRT_END) */
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