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0
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1 /* Specialized bits of code needed to support construction and
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2 destruction of file-scope objects in C++ code.
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3 Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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4 2002, 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
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5 Contributed by Ron Guilmette (rfg@monkeys.com).
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License as published by the Free
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11 Software Foundation; either version 3, or (at your option) any later
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12 version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 Under Section 7 of GPL version 3, you are granted additional
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20 permissions described in the GCC Runtime Library Exception, version
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21 3.1, as published by the Free Software Foundation.
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22
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23 You should have received a copy of the GNU General Public License and
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24 a copy of the GCC Runtime Library Exception along with this program;
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25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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26 <http://www.gnu.org/licenses/>. */
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27
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28 /* This file is a bit like libgcc2.c in that it is compiled
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29 multiple times and yields multiple .o files.
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30
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31 This file is useful on target machines where the object file format
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32 supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On
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33 such systems, this file allows us to avoid running collect (or any
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34 other such slow and painful kludge). Additionally, if the target
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35 system supports a .init section, this file allows us to support the
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36 linking of C++ code with a non-C++ main program.
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37
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38 Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then
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39 this file *will* make use of the .init section. If that symbol is
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40 not defined however, then the .init section will not be used.
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41
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42 Currently, only ELF and COFF are supported. It is likely however that
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43 ROSE could also be supported, if someone was willing to do the work to
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44 make whatever (small?) adaptations are needed. (Some work may be
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45 needed on the ROSE assembler and linker also.)
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46
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47 This file must be compiled with gcc. */
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48
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49 /* Target machine header files require this define. */
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50 #define IN_LIBGCC2
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51
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52 /* FIXME: Including auto-host is incorrect, but until we have
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53 identified the set of defines that need to go into auto-target.h,
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54 this will have to do. */
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55 #include "auto-host.h"
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56 #undef gid_t
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57 #undef pid_t
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58 #undef rlim_t
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59 #undef ssize_t
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60 #undef uid_t
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61 #undef vfork
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62 #include "tconfig.h"
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63 #include "tsystem.h"
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64 #include "coretypes.h"
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65 #include "tm.h"
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66 #include "unwind-dw2-fde.h"
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67
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68 #ifndef FORCE_CODE_SECTION_ALIGN
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69 # define FORCE_CODE_SECTION_ALIGN
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70 #endif
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71
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72 #ifndef CRT_CALL_STATIC_FUNCTION
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73 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
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74 static void __attribute__((__used__)) \
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75 call_ ## FUNC (void) \
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76 { \
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77 asm (SECTION_OP); \
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78 FUNC (); \
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79 FORCE_CODE_SECTION_ALIGN \
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80 asm (TEXT_SECTION_ASM_OP); \
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81 }
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82 #endif
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83
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84 #if defined(OBJECT_FORMAT_ELF) \
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85 && !defined(OBJECT_FORMAT_FLAT) \
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86 && defined(HAVE_LD_EH_FRAME_HDR) \
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87 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
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88 && defined(__GLIBC__) && __GLIBC__ >= 2
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89 #include <link.h>
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90 /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h.
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91 But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */
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92 # if !defined(__UCLIBC__) \
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93 && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
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94 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
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95 # define USE_PT_GNU_EH_FRAME
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96 # endif
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97 #endif
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98 #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME)
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99 # define USE_EH_FRAME_REGISTRY
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100 #endif
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101 #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY
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102 # define EH_FRAME_SECTION_CONST const
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103 #else
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104 # define EH_FRAME_SECTION_CONST
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105 #endif
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106
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107 #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \
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108 && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP)
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109 # define HIDDEN_DTOR_LIST_END
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110 #endif
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111
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112 /* We do not want to add the weak attribute to the declarations of these
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113 routines in unwind-dw2-fde.h because that will cause the definition of
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114 these symbols to be weak as well.
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115
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116 This exposes a core issue, how to handle creating weak references vs
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117 how to create weak definitions. Either we have to have the definition
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118 of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or
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119 have a second declaration if we want a function's references to be weak,
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120 but not its definition.
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121
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122 Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until
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123 one thinks about scaling to larger problems -- i.e., the condition under
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124 which TARGET_WEAK_ATTRIBUTE is active will eventually get far too
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125 complicated.
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126
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127 So, we take an approach similar to #pragma weak -- we have a second
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128 declaration for functions that we want to have weak references.
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129
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130 Neither way is particularly good. */
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131
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132 /* References to __register_frame_info and __deregister_frame_info should
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133 be weak in this file if at all possible. */
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134 extern void __register_frame_info (const void *, struct object *)
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135 TARGET_ATTRIBUTE_WEAK;
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136 extern void __register_frame_info_bases (const void *, struct object *,
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137 void *, void *)
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138 TARGET_ATTRIBUTE_WEAK;
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139 extern void *__deregister_frame_info (const void *)
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140 TARGET_ATTRIBUTE_WEAK;
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141 extern void *__deregister_frame_info_bases (const void *)
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142 TARGET_ATTRIBUTE_WEAK;
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143 extern void __do_global_ctors_1 (void);
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144
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145 /* Likewise for _Jv_RegisterClasses. */
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146 extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK;
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147
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148 #ifdef OBJECT_FORMAT_ELF
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149
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150 /* Declare a pointer to void function type. */
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151 typedef void (*func_ptr) (void);
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152 #define STATIC static
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153
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154 #else /* OBJECT_FORMAT_ELF */
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155
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156 #include "gbl-ctors.h"
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157
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158 #define STATIC
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159
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160 #endif /* OBJECT_FORMAT_ELF */
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161
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162 #ifdef CRT_BEGIN
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163
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164 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange
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165 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
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166 __DTOR_END__ } per root executable and also one set of these symbols
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167 per shared library. So in any given whole process image, we may have
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168 multiple definitions of each of these symbols. In order to prevent
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169 these definitions from conflicting with one another, and in order to
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170 ensure that the proper lists are used for the initialization/finalization
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171 of each individual shared library (respectively), we give these symbols
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172 only internal (i.e. `static') linkage, and we also make it a point to
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173 refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__
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174 symbol in crtbegin.o, where they are defined. */
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175
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176 /* The -1 is a flag to __do_global_[cd]tors indicating that this table
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177 does not start with a count of elements. */
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178 #ifdef CTOR_LIST_BEGIN
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179 CTOR_LIST_BEGIN;
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180 #elif defined(CTORS_SECTION_ASM_OP)
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181 /* Hack: force cc1 to switch to .data section early, so that assembling
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182 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
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183 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
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184 asm (CTORS_SECTION_ASM_OP);
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185 STATIC func_ptr __CTOR_LIST__[1]
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186 __attribute__ ((__unused__, aligned(sizeof(func_ptr))))
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187 = { (func_ptr) (-1) };
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188 #else
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189 STATIC func_ptr __CTOR_LIST__[1]
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190 __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr))))
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191 = { (func_ptr) (-1) };
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192 #endif /* __CTOR_LIST__ alternatives */
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193
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194 #ifdef DTOR_LIST_BEGIN
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195 DTOR_LIST_BEGIN;
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196 #elif defined(DTORS_SECTION_ASM_OP)
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197 asm (DTORS_SECTION_ASM_OP);
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198 STATIC func_ptr __DTOR_LIST__[1]
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199 __attribute__ ((aligned(sizeof(func_ptr))))
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200 = { (func_ptr) (-1) };
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201 #else
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202 STATIC func_ptr __DTOR_LIST__[1]
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203 __attribute__((section(".dtors"), aligned(sizeof(func_ptr))))
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204 = { (func_ptr) (-1) };
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205 #endif /* __DTOR_LIST__ alternatives */
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206
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207 #ifdef USE_EH_FRAME_REGISTRY
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208 /* Stick a label at the beginning of the frame unwind info so we can register
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209 and deregister it with the exception handling library code. */
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210 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
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211 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4)))
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212 = { };
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213 #endif /* USE_EH_FRAME_REGISTRY */
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214
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215 #ifdef JCR_SECTION_NAME
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216 /* Stick a label at the beginning of the java class registration info
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217 so we can register them properly. */
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218 STATIC void *__JCR_LIST__[]
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219 __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*))))
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220 = { };
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221 #endif /* JCR_SECTION_NAME */
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222
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223 #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP)
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224
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225 #ifdef OBJECT_FORMAT_ELF
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226
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227 /* Declare the __dso_handle variable. It should have a unique value
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228 in every shared-object; in a main program its value is zero. The
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229 object should in any case be protected. This means the instance
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230 in one DSO or the main program is not used in another object. The
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231 dynamic linker takes care of this. */
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232
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233 #ifdef TARGET_LIBGCC_SDATA_SECTION
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234 extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION)));
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235 #endif
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236 #ifdef HAVE_GAS_HIDDEN
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237 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
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238 #endif
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239 #ifdef CRTSTUFFS_O
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240 void *__dso_handle = &__dso_handle;
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241 #else
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242 void *__dso_handle = 0;
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243 #endif
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244
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245 /* The __cxa_finalize function may not be available so we use only a
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246 weak declaration. */
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247 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
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248
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249 /* Run all the global destructors on exit from the program. */
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250
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251 /* Some systems place the number of pointers in the first word of the
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252 table. On SVR4 however, that word is -1. In all cases, the table is
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253 null-terminated. On SVR4, we start from the beginning of the list and
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254 invoke each per-compilation-unit destructor routine in order
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255 until we find that null.
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256
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257 Note that this function MUST be static. There will be one of these
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258 functions in each root executable and one in each shared library, but
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259 although they all have the same code, each one is unique in that it
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260 refers to one particular associated `__DTOR_LIST__' which belongs to the
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261 same particular root executable or shared library file.
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262
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263 On some systems, this routine is run more than once from the .fini,
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264 when exit is called recursively, so we arrange to remember where in
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265 the list we left off processing, and we resume at that point,
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266 should we be re-invoked. */
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267
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268 static void __attribute__((used))
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269 __do_global_dtors_aux (void)
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270 {
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271 static _Bool completed;
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272
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273 if (__builtin_expect (completed, 0))
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274 return;
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275
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276 #ifdef CRTSTUFFS_O
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277 if (__cxa_finalize)
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278 __cxa_finalize (__dso_handle);
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279 #endif
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280
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281 #ifdef FINI_ARRAY_SECTION_ASM_OP
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282 /* If we are using .fini_array then destructors will be run via that
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283 mechanism. */
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284 #elif defined(HIDDEN_DTOR_LIST_END)
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285 {
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286 /* Safer version that makes sure only .dtors function pointers are
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287 called even if the static variable is maliciously changed. */
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288 extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden")));
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289 static size_t dtor_idx;
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290 const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1;
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291 func_ptr f;
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292
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293 while (dtor_idx < max_idx)
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294 {
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295 f = __DTOR_LIST__[++dtor_idx];
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296 f ();
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297 }
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298 }
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299 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
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300 {
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301 static func_ptr *p = __DTOR_LIST__ + 1;
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302 func_ptr f;
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303
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304 while ((f = *p))
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305 {
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306 p++;
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307 f ();
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308 }
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309 }
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310 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
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311
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312 #ifdef USE_EH_FRAME_REGISTRY
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313 #ifdef CRT_GET_RFIB_DATA
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314 /* If we used the new __register_frame_info_bases interface,
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315 make sure that we deregister from the same place. */
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316 if (__deregister_frame_info_bases)
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317 __deregister_frame_info_bases (__EH_FRAME_BEGIN__);
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318 #else
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319 if (__deregister_frame_info)
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320 __deregister_frame_info (__EH_FRAME_BEGIN__);
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321 #endif
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322 #endif
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323
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324 completed = 1;
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325 }
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326
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327 /* Stick a call to __do_global_dtors_aux into the .fini section. */
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328 #ifdef FINI_SECTION_ASM_OP
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329 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux)
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330 #else /* !defined(FINI_SECTION_ASM_OP) */
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331 static func_ptr __do_global_dtors_aux_fini_array_entry[]
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332 __attribute__ ((__unused__, section(".fini_array")))
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333 = { __do_global_dtors_aux };
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334 #endif /* !defined(FINI_SECTION_ASM_OP) */
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335
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336 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
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337 /* Stick a call to __register_frame_info into the .init section. For some
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338 reason calls with no arguments work more reliably in .init, so stick the
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339 call in another function. */
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340
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341 static void __attribute__((used))
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342 frame_dummy (void)
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343 {
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344 #ifdef USE_EH_FRAME_REGISTRY
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345 static struct object object;
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346 #ifdef CRT_GET_RFIB_DATA
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347 void *tbase, *dbase;
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348 tbase = 0;
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349 CRT_GET_RFIB_DATA (dbase);
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350 if (__register_frame_info_bases)
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351 __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase);
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352 #else
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353 if (__register_frame_info)
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354 __register_frame_info (__EH_FRAME_BEGIN__, &object);
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355 #endif /* CRT_GET_RFIB_DATA */
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356 #endif /* USE_EH_FRAME_REGISTRY */
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357 #ifdef JCR_SECTION_NAME
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358 if (__JCR_LIST__[0])
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359 {
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360 void (*register_classes) (void *) = _Jv_RegisterClasses;
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361 __asm ("" : "+r" (register_classes));
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362 if (register_classes)
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363 register_classes (__JCR_LIST__);
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364 }
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365 #endif /* JCR_SECTION_NAME */
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366 }
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367
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368 #ifdef INIT_SECTION_ASM_OP
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369 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy)
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370 #else /* defined(INIT_SECTION_ASM_OP) */
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371 static func_ptr __frame_dummy_init_array_entry[]
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372 __attribute__ ((__unused__, section(".init_array")))
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373 = { frame_dummy };
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374 #endif /* !defined(INIT_SECTION_ASM_OP) */
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375 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */
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376
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377 #else /* OBJECT_FORMAT_ELF */
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378
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379 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
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380 and once in crtend.o). It must be declared static to avoid a link
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381 error. Here, we define __do_global_ctors as an externally callable
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382 function. It is externally callable so that __main can invoke it when
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383 INVOKE__main is defined. This has the additional effect of forcing cc1
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384 to switch to the .text section. */
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385
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386 static void __do_global_ctors_aux (void);
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387 void
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388 __do_global_ctors (void)
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389 {
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390 #ifdef INVOKE__main
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391 /* If __main won't actually call __do_global_ctors then it doesn't matter
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392 what's inside the function. The inside of __do_global_ctors_aux is
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393 called automatically in that case. And the Alliant fx2800 linker
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394 crashes on this reference. So prevent the crash. */
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395 __do_global_ctors_aux ();
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396 #endif
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397 }
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398
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399 asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */
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400
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401 /* A routine to invoke all of the global constructors upon entry to the
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402 program. We put this into the .init section (for systems that have
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403 such a thing) so that we can properly perform the construction of
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404 file-scope static-storage C++ objects within shared libraries. */
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405
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406 static void __attribute__((used))
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407 __do_global_ctors_aux (void) /* prologue goes in .init section */
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408 {
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409 FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */
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410 asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */
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411 DO_GLOBAL_CTORS_BODY;
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412 atexit (__do_global_dtors);
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413 }
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414
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415 #endif /* OBJECT_FORMAT_ELF */
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416
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417 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
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418
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419 extern void __do_global_dtors (void);
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420
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421 /* This case is used by the Irix 6 port, which supports named sections but
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422 not an SVR4-style .fini section. __do_global_dtors can be non-static
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423 in this case because we protect it with -hidden_symbol. */
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424
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425 void
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426 __do_global_dtors (void)
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427 {
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428 func_ptr *p, f;
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429 for (p = __DTOR_LIST__ + 1; (f = *p); p++)
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430 f ();
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431
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432 #ifdef USE_EH_FRAME_REGISTRY
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433 if (__deregister_frame_info)
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434 __deregister_frame_info (__EH_FRAME_BEGIN__);
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435 #endif
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436 }
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437
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438 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
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439 /* A helper function for __do_global_ctors, which is in crtend.o. Here
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440 in crtbegin.o, we can reference a couple of symbols not visible there.
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441 Plus, since we're before libgcc.a, we have no problems referencing
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442 functions from there. */
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443 void
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444 __do_global_ctors_1(void)
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445 {
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446 #ifdef USE_EH_FRAME_REGISTRY
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447 static struct object object;
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|
|
448 if (__register_frame_info)
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449 __register_frame_info (__EH_FRAME_BEGIN__, &object);
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|
|
450 #endif
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|
|
451 #ifdef JCR_SECTION_NAME
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|
|
452 if (__JCR_LIST__[0])
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|
453 {
|
|
|
454 void (*register_classes) (void *) = _Jv_RegisterClasses;
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|
|
455 __asm ("" : "+r" (register_classes));
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|
|
456 if (register_classes)
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|
|
457 register_classes (__JCR_LIST__);
|
|
|
458 }
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|
|
459 #endif
|
|
|
460 }
|
|
|
461 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */
|
|
|
462
|
|
|
463 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
|
|
|
464 #error "What are you doing with crtstuff.c, then?"
|
|
|
465 #endif
|
|
|
466
|
|
|
467 #elif defined(CRT_END) /* ! CRT_BEGIN */
|
|
|
468
|
|
|
469 /* Put a word containing zero at the end of each of our two lists of function
|
|
|
470 addresses. Note that the words defined here go into the .ctors and .dtors
|
|
|
471 sections of the crtend.o file, and since that file is always linked in
|
|
|
472 last, these words naturally end up at the very ends of the two lists
|
|
|
473 contained in these two sections. */
|
|
|
474
|
|
|
475 #ifdef CTOR_LIST_END
|
|
|
476 CTOR_LIST_END;
|
|
|
477 #elif defined(CTORS_SECTION_ASM_OP)
|
|
|
478 /* Hack: force cc1 to switch to .data section early, so that assembling
|
|
|
479 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
|
|
|
480 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
|
|
|
481 asm (CTORS_SECTION_ASM_OP);
|
|
|
482 STATIC func_ptr __CTOR_END__[1]
|
|
|
483 __attribute__((aligned(sizeof(func_ptr))))
|
|
|
484 = { (func_ptr) 0 };
|
|
|
485 #else
|
|
|
486 STATIC func_ptr __CTOR_END__[1]
|
|
|
487 __attribute__((section(".ctors"), aligned(sizeof(func_ptr))))
|
|
|
488 = { (func_ptr) 0 };
|
|
|
489 #endif
|
|
|
490
|
|
|
491 #ifdef DTOR_LIST_END
|
|
|
492 DTOR_LIST_END;
|
|
|
493 #elif defined(HIDDEN_DTOR_LIST_END)
|
|
|
494 #ifdef DTORS_SECTION_ASM_OP
|
|
|
495 asm (DTORS_SECTION_ASM_OP);
|
|
|
496 #endif
|
|
|
497 func_ptr __DTOR_END__[1]
|
|
|
498 __attribute__ ((unused,
|
|
|
499 #ifndef DTORS_SECTION_ASM_OP
|
|
|
500 section(".dtors"),
|
|
|
501 #endif
|
|
|
502 aligned(sizeof(func_ptr)), visibility ("hidden")))
|
|
|
503 = { (func_ptr) 0 };
|
|
|
504 #elif defined(DTORS_SECTION_ASM_OP)
|
|
|
505 asm (DTORS_SECTION_ASM_OP);
|
|
|
506 STATIC func_ptr __DTOR_END__[1]
|
|
|
507 __attribute__ ((unused, aligned(sizeof(func_ptr))))
|
|
|
508 = { (func_ptr) 0 };
|
|
|
509 #else
|
|
|
510 STATIC func_ptr __DTOR_END__[1]
|
|
|
511 __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr))))
|
|
|
512 = { (func_ptr) 0 };
|
|
|
513 #endif
|
|
|
514
|
|
|
515 #ifdef EH_FRAME_SECTION_NAME
|
|
|
516 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
|
|
|
517 this would be the 'length' field in a real FDE. */
|
|
|
518 # if __INT_MAX__ == 2147483647
|
|
|
519 typedef int int32;
|
|
|
520 # elif __LONG_MAX__ == 2147483647
|
|
|
521 typedef long int32;
|
|
|
522 # elif __SHRT_MAX__ == 2147483647
|
|
|
523 typedef short int32;
|
|
|
524 # else
|
|
|
525 # error "Missing a 4 byte integer"
|
|
|
526 # endif
|
|
|
527 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[]
|
|
|
528 __attribute__ ((unused, section(EH_FRAME_SECTION_NAME),
|
|
|
529 aligned(sizeof(int32))))
|
|
|
530 = { 0 };
|
|
|
531 #endif /* EH_FRAME_SECTION_NAME */
|
|
|
532
|
|
|
533 #ifdef JCR_SECTION_NAME
|
|
|
534 /* Null terminate the .jcr section array. */
|
|
|
535 STATIC void *__JCR_END__[1]
|
|
|
536 __attribute__ ((unused, section(JCR_SECTION_NAME),
|
|
|
537 aligned(sizeof(void *))))
|
|
|
538 = { 0 };
|
|
|
539 #endif /* JCR_SECTION_NAME */
|
|
|
540
|
|
|
541 #ifdef INIT_ARRAY_SECTION_ASM_OP
|
|
|
542
|
|
|
543 /* If we are using .init_array, there is nothing to do. */
|
|
|
544
|
|
|
545 #elif defined(INIT_SECTION_ASM_OP)
|
|
|
546
|
|
|
547 #ifdef OBJECT_FORMAT_ELF
|
|
|
548 static void __attribute__((used))
|
|
|
549 __do_global_ctors_aux (void)
|
|
|
550 {
|
|
|
551 func_ptr *p;
|
|
|
552 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
|
|
|
553 (*p) ();
|
|
|
554 }
|
|
|
555
|
|
|
556 /* Stick a call to __do_global_ctors_aux into the .init section. */
|
|
|
557 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux)
|
|
|
558 #else /* OBJECT_FORMAT_ELF */
|
|
|
559
|
|
|
560 /* Stick the real initialization code, followed by a normal sort of
|
|
|
561 function epilogue at the very end of the .init section for this
|
|
|
562 entire root executable file or for this entire shared library file.
|
|
|
563
|
|
|
564 Note that we use some tricks here to get *just* the body and just
|
|
|
565 a function epilogue (but no function prologue) into the .init
|
|
|
566 section of the crtend.o file. Specifically, we switch to the .text
|
|
|
567 section, start to define a function, and then we switch to the .init
|
|
|
568 section just before the body code.
|
|
|
569
|
|
|
570 Earlier on, we put the corresponding function prologue into the .init
|
|
|
571 section of the crtbegin.o file (which will be linked in first).
|
|
|
572
|
|
|
573 Note that we want to invoke all constructors for C++ file-scope static-
|
|
|
574 storage objects AFTER any other possible initialization actions which
|
|
|
575 may be performed by the code in the .init section contributions made by
|
|
|
576 other libraries, etc. That's because those other initializations may
|
|
|
577 include setup operations for very primitive things (e.g. initializing
|
|
|
578 the state of the floating-point coprocessor, etc.) which should be done
|
|
|
579 before we start to execute any of the user's code. */
|
|
|
580
|
|
|
581 static void
|
|
|
582 __do_global_ctors_aux (void) /* prologue goes in .text section */
|
|
|
583 {
|
|
|
584 asm (INIT_SECTION_ASM_OP);
|
|
|
585 DO_GLOBAL_CTORS_BODY;
|
|
|
586 atexit (__do_global_dtors);
|
|
|
587 } /* epilogue and body go in .init section */
|
|
|
588
|
|
|
589 FORCE_CODE_SECTION_ALIGN
|
|
|
590 asm (TEXT_SECTION_ASM_OP);
|
|
|
591
|
|
|
592 #endif /* OBJECT_FORMAT_ELF */
|
|
|
593
|
|
|
594 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
|
|
|
595
|
|
|
596 extern void __do_global_ctors (void);
|
|
|
597
|
|
|
598 /* This case is used by the Irix 6 port, which supports named sections but
|
|
|
599 not an SVR4-style .init section. __do_global_ctors can be non-static
|
|
|
600 in this case because we protect it with -hidden_symbol. */
|
|
|
601 void
|
|
|
602 __do_global_ctors (void)
|
|
|
603 {
|
|
|
604 func_ptr *p;
|
|
|
605 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
|
|
|
606 __do_global_ctors_1();
|
|
|
607 #endif
|
|
|
608 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
|
|
|
609 (*p) ();
|
|
|
610 }
|
|
|
611
|
|
|
612 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
|
|
|
613 #error "What are you doing with crtstuff.c, then?"
|
|
|
614 #endif
|
|
|
615
|
|
|
616 #else /* ! CRT_BEGIN && ! CRT_END */
|
|
|
617 #error "One of CRT_BEGIN or CRT_END must be defined."
|
|
|
618 #endif
|
