gcc/config/darwin-sections.def

   1 /* Copyright (C) 2005-2014 Free Software Foundation, Inc.
   2
   3 This file is part of GCC.
   4
   5 GCC is free software; you can redistribute it and/or modify it under
   6 the terms of the GNU General Public License as published by the Free
   7 Software Foundation; either version 3, or (at your option) any later
   8 version.
   9
  10 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  11 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13 for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GCC; see the file COPYING3.  If not see
  17 <http://www.gnu.org/licenses/>.  */
  18
  19 /* Since Darwin's ld will not allow zero-sized objects, and gcc wants them,
  20    we emit one byte (in darwin.c) when such an object is encountered.
  21
  22    This messes up section anchoring because the emitted byte is not counted
  23    outside the port.  To cope with this, we set aside sections for zero-sized
  24    objects and disallow those sections from  participating in section anchors
  25    ("zobj_" sections, below).
  26
  27    Items that might be coalesced by the linker are prevented from participating,
  28    (and those in mergeable sections are disallowed in varasm.c).  */
  29
  30 /* The .text section is generated in varasm.c  */
  31 DEF_SECTION (text_coal_section, SECTION_CODE|SECTION_NO_ANCHOR,
  32              ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0)
  33
  34 DEF_SECTION (text_hot_section, SECTION_CODE,
  35              ".section __TEXT,__text_hot,regular,pure_instructions", 0)
  36 DEF_SECTION (text_cold_section, SECTION_CODE,
  37              ".section __TEXT,__text_cold,regular,pure_instructions", 0)
  38 DEF_SECTION (text_startup_section, SECTION_CODE,
  39              ".section __TEXT,__text_startup,regular,pure_instructions", 0)
  40 DEF_SECTION (text_exit_section, SECTION_CODE,
  41              ".section __TEXT,__text_exit,regular,pure_instructions", 0)
  42
  43 DEF_SECTION (text_hot_coal_section, SECTION_CODE,
  44              ".section __TEXT,__text_hot_coal,coalesced,pure_instructions", 0)
  45 DEF_SECTION (text_cold_coal_section, SECTION_CODE,
  46              ".section __TEXT,__text_cold_coal,coalesced,pure_instructions", 0)
  47 DEF_SECTION (text_startup_coal_section, SECTION_CODE,
  48              ".section __TEXT,__text_stt_coal,coalesced,pure_instructions", 0)
  49 DEF_SECTION (text_exit_coal_section, SECTION_CODE,
  50              ".section __TEXT,__text_exit_coal,coalesced,pure_instructions", 0)
  51
  52 /* const */
  53 DEF_SECTION (const_section, 0, ".const", 0)
  54 DEF_SECTION (const_coal_section, SECTION_NO_ANCHOR,
  55              ".section __TEXT,__const_coal,coalesced", 0)
  56 /* Place to put zero-sized to avoid issues with section anchors.  */
  57 DEF_SECTION (zobj_const_section, SECTION_NO_ANCHOR,
  58              ".section\t__DATA,__zobj_const", 0)
  59
  60 /* Write-able data.  '.data'  handled in varasm.c  */
  61 DEF_SECTION (static_data_section, SECTION_WRITE, ".static_data", 0)
  62 DEF_SECTION (data_coal_section, SECTION_WRITE|SECTION_NO_ANCHOR,
  63              ".section __DATA,__datacoal_nt,coalesced", 0)
  64 /* Place to put zero-sized to avoid issues with section anchors.  */
  65 DEF_SECTION (zobj_data_section, SECTION_WRITE|SECTION_NO_ANCHOR,
  66              ".section\t__DATA,__zobj_data", 0)
  67
  68 /* BSS - .lcomm / .zerofill __DATA,__bss sections cannot be switched to
  69    explicitly (will create an assembler error).  */
  70 DEF_SECTION (zobj_bss_section, SECTION_WRITE|SECTION_BSS|SECTION_NO_ANCHOR,
  71              ".section\t__DATA,__zobj_bss", 0)
  72
  73 /* const data */
  74 DEF_SECTION (const_data_section, 0, ".const_data", 0)
  75 DEF_SECTION (const_data_coal_section, SECTION_NO_ANCHOR,
  76              ".section __DATA,__const_coal,coalesced", 0)
  77 /* Place to put zero-sized to avoid issues with section anchors.  */
  78 DEF_SECTION (zobj_const_data_section, SECTION_NO_ANCHOR,
  79              ".section\t__DATA,__zobj_cnst_data", 0)
  80
  81 /* Strings and other literals.  */
  82 DEF_SECTION (cstring_section, SECTION_MERGE | SECTION_STRINGS, ".cstring", 0)
  83 DEF_SECTION (literal4_section, SECTION_MERGE, ".literal4", 0)
  84 DEF_SECTION (literal8_section, SECTION_MERGE, ".literal8", 0)
  85 DEF_SECTION (literal16_section, SECTION_MERGE, ".literal16", 0)
  86 /* Unlike constant NSStrings, constant CFStrings do not live  in the
  87    __OBJC segment since they may also occur in pure C  or C++ programs.  */
  88 DEF_SECTION (cfstring_constant_object_section, 0,
  89              ".section __DATA, __cfstring", 0)
  90
  91 /* Module init, term, constructors & destructors.  */
  92 DEF_SECTION (mod_init_section, 0, ".mod_init_func", 0)
  93 DEF_SECTION (mod_term_section, 0, ".mod_term_func", 0)
  94 DEF_SECTION (constructor_section, 0, ".constructor", 0)
  95 DEF_SECTION (destructor_section, 0, ".destructor", 0)
  96
  97 /* Objective-C ABI=0 (Original version) sections.  */
  98 DEF_SECTION (objc_class_section, 0, ".objc_class", 1)
  99 DEF_SECTION (objc_meta_class_section, 0, ".objc_meta_class", 1)
 100 DEF_SECTION (objc_category_section, 0, ".objc_category", 1)
 101 DEF_SECTION (objc_class_vars_section, 0, ".objc_class_vars", 1)
 102 DEF_SECTION (objc_instance_vars_section, 0, ".objc_instance_vars", 1)
 103 DEF_SECTION (objc_cls_meth_section, 0, ".objc_cls_meth", 1)
 104 DEF_SECTION (objc_inst_meth_section, 0, ".objc_inst_meth", 1)
 105 DEF_SECTION (objc_cat_cls_meth_section, 0, ".objc_cat_cls_meth", 1)
 106 DEF_SECTION (objc_cat_inst_meth_section, 0, ".objc_cat_inst_meth", 1)
 107 DEF_SECTION (objc_selector_refs_section, SECTION_MERGE, ".objc_message_refs", 1)
 108 DEF_SECTION (objc_selector_fixup_section, 0,
 109             ".section __OBJC, __sel_fixup, regular, no_dead_strip", 1)
 110 DEF_SECTION (objc_symbols_section, 0, ".objc_symbols", 1)
 111 DEF_SECTION (objc_module_info_section, 0, ".objc_module_info", 1)
 112 DEF_SECTION (objc_protocol_section, 0, ".objc_protocol", 1)
 113 DEF_SECTION (objc_string_object_section, 0, ".objc_string_object", 1)
 114 DEF_SECTION (objc_constant_string_object_section, 0,
 115              ".section __OBJC, __cstring_object, regular, no_dead_strip", 0)
 116
 117 /* Fix-and-Continue image marker.  */
 118 DEF_SECTION (objc_image_info_section, 0,
 119              ".section __OBJC, __image_info, regular, no_dead_strip", 1)
 120 DEF_SECTION (objc_class_names_section, 0, ".objc_class_names", 1)
 121 DEF_SECTION (objc_meth_var_names_section, 0, ".objc_meth_var_names", 1)
 122 DEF_SECTION (objc_meth_var_types_section, 0, ".objc_meth_var_types", 1)
 123 DEF_SECTION (objc_cls_refs_section, SECTION_MERGE, ".objc_cls_refs", 1)
 124
 125 /* Stubs and symbol indirection sections.  */
 126 /* lazy symbol pointers.  */
 127 DEF_SECTION (machopic_lazy_symbol_ptr_section, SECTION_NO_ANCHOR,
 128              ".lazy_symbol_pointer", 0)
 129 DEF_SECTION (machopic_lazy_symbol_ptr2_section, SECTION_NO_ANCHOR,
 130              ".section __DATA, __la_sym_ptr2,lazy_symbol_pointers", 0)
 131 DEF_SECTION (machopic_lazy_symbol_ptr3_section, SECTION_NO_ANCHOR,
 132              ".section __DATA, __la_sym_ptr3,lazy_symbol_pointers", 0)
 133 /* non-lazy symbol pointers.  */
 134 DEF_SECTION (machopic_nl_symbol_ptr_section, SECTION_NO_ANCHOR,
 135              MACHOPIC_NL_SYMBOL_PTR_SECTION, 0)
 136 /* Symbol stubs.  */
 137 DEF_SECTION (machopic_symbol_stub_section, SECTION_NO_ANCHOR,
 138              ".symbol_stub", 0)
 139 DEF_SECTION (machopic_symbol_stub1_section, SECTION_NO_ANCHOR,
 140              ".section __TEXT,__symbol_stub1,symbol_stubs,"
 141              "pure_instructions,16", 0)
 142 /* PIC symbol stubs.  */
 143 DEF_SECTION (machopic_picsymbol_stub_section, SECTION_NO_ANCHOR,
 144              ".picsymbol_stub", 0)
 145 DEF_SECTION (machopic_picsymbol_stub1_section, SECTION_NO_ANCHOR,
 146              ".section __TEXT,__picsymbolstub1,symbol_stubs,"
 147              "pure_instructions,32", 0)
 148 DEF_SECTION (machopic_picsymbol_stub2_section, SECTION_NO_ANCHOR,
 149              ".section __TEXT,__picsymbolstub2,symbol_stubs,pure_instructions,25", 0)
 150 DEF_SECTION (machopic_picsymbol_stub3_section, SECTION_NO_ANCHOR,
 151              ".section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5", 0)
 152
 153 /* Exception-related.  */
 154 DEF_SECTION (darwin_exception_section, SECTION_NO_ANCHOR,
 155              ".section __DATA,__gcc_except_tab", 0)
 156 DEF_SECTION (darwin_eh_frame_section, SECTION_NO_ANCHOR,
 157              ".section " EH_FRAME_SECTION_NAME ",__eh_frame"
 158              EH_FRAME_SECTION_ATTR, 0)
 159
 160 /* Sections for ObjC ABI=1 (ObjC 'V1' extensions) */
 161 DEF_SECTION (objc1_class_ext_section, 0,
 162             ".section __OBJC, __class_ext, regular, no_dead_strip", 1)
 163 DEF_SECTION (objc1_prop_list_section, 0,
 164             ".section __OBJC, __property, regular, no_dead_strip", 1)
 165 DEF_SECTION (objc1_protocol_ext_section, 0,
 166             ".section __OBJC, __protocol_ext, regular, no_dead_strip", 1)
 167
 168 /* Sections for ObjC ABI=2 (m64).  */
 169 DEF_SECTION (objc2_message_refs_section, 0,
 170              ".section __DATA, __objc_msgrefs, regular, no_dead_strip", 1)
 171 DEF_SECTION (objc2_classdefs_section, 0, ".section __DATA, __objc_data", 1)
 172 DEF_SECTION (objc2_metadata_section, 0, ".section __DATA, __objc_const", 1)
 173
 174 DEF_SECTION (objc2_classrefs_section, 0,
 175              ".section __DATA, __objc_classrefs, regular, no_dead_strip", 1)
 176 DEF_SECTION (objc2_classlist_section, 0,
 177              ".section __DATA, __objc_classlist, regular, no_dead_strip", 1)
 178 DEF_SECTION (objc2_categorylist_section, 0,
 179              ".section __DATA, __objc_catlist, regular, no_dead_strip", 1)
 180 DEF_SECTION (objc2_selector_refs_section, 0,
 181              ".section __DATA, __objc_selrefs, literal_pointers, no_dead_strip", 1)
 182 DEF_SECTION (objc2_nonlazy_class_section, 0,
 183              ".section __DATA, __objc_nlclslist, regular, no_dead_strip", 1)
 184 DEF_SECTION (objc2_nonlazy_category_section, 0,
 185              ".section __DATA, __objc_nlcatlist, regular, no_dead_strip", 1)
 186 DEF_SECTION (objc2_protocollist_section, 0,
 187              ".section __DATA, __objc_protolist, regular, no_dead_strip", 1)
 188 DEF_SECTION (objc2_protocolrefs_section, 0,
 189              ".section __DATA, __objc_protorefs, regular, no_dead_strip", 1)
 190 DEF_SECTION (objc2_super_classrefs_section, 0,
 191              ".section __DATA, __objc_superrefs, regular, no_dead_strip", 1)
 192 DEF_SECTION (objc2_image_info_section, 0,
 193              ".section __DATA, __objc_imageinfo, regular, no_dead_strip", 1)
 194 DEF_SECTION (objc2_constant_string_object_section, 0,
 195              ".section __DATA, __objc_stringobj, regular, no_dead_strip", 1)