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[thirdparty/gcc.git] / gcc / config / darwin-sections.def

/* Copyright (C) 2005-2021 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* Since Darwin's ld will not allow zero-sized objects, and gcc wants them,
   we emit one byte (in darwin.c) when such an object is encountered.

   This messes up section anchoring because the emitted byte is not counted
   outside the port.  To cope with this, we set aside sections for zero-sized
   objects and disallow those sections from  participating in section anchors
   ("zobj_" sections, below).
   
   Items that might be coalesced by the linker are prevented from participating,
   (and those in mergeable sections are disallowed in varasm.c).  */

/* The .text section is generated in varasm.c  */
DEF_SECTION (text_coal_section, SECTION_CODE|SECTION_NO_ANCHOR,
	     ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0)

/* We define a picbase thunks section separately, so that we can override the
   def to be '.text' for versions of ld64 that handle coalescing.  */
DEF_SECTION (picbase_thunk_section, SECTION_CODE|SECTION_NO_ANCHOR,
	     ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0)

DEF_SECTION (text_hot_section, SECTION_CODE,
	     ".section __TEXT,__text_hot,regular,pure_instructions", 0)
DEF_SECTION (text_cold_section, SECTION_CODE,
	     ".section __TEXT,__text_cold,regular,pure_instructions", 0)
DEF_SECTION (text_startup_section, SECTION_CODE,
	     ".section __TEXT,__text_startup,regular,pure_instructions", 0)
DEF_SECTION (text_exit_section, SECTION_CODE,
	     ".section __TEXT,__text_exit,regular,pure_instructions", 0)

DEF_SECTION (text_hot_coal_section, SECTION_CODE,
	     ".section __TEXT,__text_hot_coal,coalesced,pure_instructions", 0)
DEF_SECTION (text_cold_coal_section, SECTION_CODE,
	     ".section __TEXT,__text_cold_coal,coalesced,pure_instructions", 0)
DEF_SECTION (text_startup_coal_section, SECTION_CODE,
	     ".section __TEXT,__text_stt_coal,coalesced,pure_instructions", 0)
DEF_SECTION (text_exit_coal_section, SECTION_CODE,
	     ".section __TEXT,__text_exit_coal,coalesced,pure_instructions", 0)

/* const */
DEF_SECTION (const_section, 0, ".const", 0)
DEF_SECTION (const_coal_section, SECTION_NO_ANCHOR,
	     ".section __TEXT,__const_coal,coalesced", 0)
/* Place to put zero-sized to avoid issues with section anchors.  */
DEF_SECTION (zobj_const_section, SECTION_NO_ANCHOR, 
	     ".section\t__DATA,__zobj_const", 0)

/* Write-able data.  '.data'  handled in varasm.c  */
DEF_SECTION (static_data_section, SECTION_WRITE, ".static_data", 0)
DEF_SECTION (data_coal_section, SECTION_WRITE|SECTION_NO_ANCHOR,
	     ".section __DATA,__datacoal_nt,coalesced", 0)
/* Place to put zero-sized to avoid issues with section anchors.  */
DEF_SECTION (zobj_data_section, SECTION_WRITE|SECTION_NO_ANCHOR, 
	     ".section\t__DATA,__zobj_data", 0)

/* BSS - .lcomm / .zerofill __DATA,__bss sections cannot be switched to
   explicitly (will create an assembler error).  */
DEF_SECTION (zobj_bss_section, SECTION_WRITE|SECTION_BSS|SECTION_NO_ANCHOR, 
	     ".section\t__DATA,__zobj_bss", 0)

/* const data */
DEF_SECTION (const_data_section, 0, ".const_data", 0)
DEF_SECTION (const_data_coal_section, SECTION_NO_ANCHOR,
	     ".section __DATA,__const_coal,coalesced", 0)
/* Place to put zero-sized to avoid issues with section anchors.  */
DEF_SECTION (zobj_const_data_section, SECTION_NO_ANCHOR, 
	     ".section\t__DATA,__zobj_cnst_data", 0)

/* Strings and other literals.  */
DEF_SECTION (cstring_section, SECTION_MERGE | SECTION_STRINGS, ".cstring", 0)
DEF_SECTION (literal4_section, SECTION_MERGE, ".literal4", 0)
DEF_SECTION (literal8_section, SECTION_MERGE, ".literal8", 0)
DEF_SECTION (literal16_section, SECTION_MERGE, ".literal16", 0)
/* Unlike constant NSStrings, constant CFStrings do not live  in the
   __OBJC segment since they may also occur in pure C  or C++ programs.  */
DEF_SECTION (cfstring_constant_object_section, 0, 
	     ".section __DATA, __cfstring", 0)

/* Module init, term, constructors & destructors.  */
DEF_SECTION (mod_init_section, 0, ".mod_init_func", 0)
DEF_SECTION (mod_term_section, 0, ".mod_term_func", 0)
DEF_SECTION (constructor_section, 0, ".constructor", 0)
DEF_SECTION (destructor_section, 0, ".destructor", 0)

/* Objective-C ABI=0 (Original version) sections.  */
DEF_SECTION (objc_class_section, 0, ".objc_class", 1)
DEF_SECTION (objc_meta_class_section, 0, ".objc_meta_class", 1)
DEF_SECTION (objc_category_section, 0, ".objc_category", 1)
DEF_SECTION (objc_class_vars_section, 0, ".objc_class_vars", 1)
DEF_SECTION (objc_instance_vars_section, 0, ".objc_instance_vars", 1)
DEF_SECTION (objc_cls_meth_section, 0, ".objc_cls_meth", 1)
DEF_SECTION (objc_inst_meth_section, 0, ".objc_inst_meth", 1)
DEF_SECTION (objc_cat_cls_meth_section, 0, ".objc_cat_cls_meth", 1)
DEF_SECTION (objc_cat_inst_meth_section, 0, ".objc_cat_inst_meth", 1)
DEF_SECTION (objc_selector_refs_section, SECTION_MERGE, ".objc_message_refs", 1)
DEF_SECTION (objc_selector_fixup_section, 0,
	    ".section __OBJC, __sel_fixup, regular, no_dead_strip", 1)
DEF_SECTION (objc_symbols_section, 0, ".objc_symbols", 1)
DEF_SECTION (objc_module_info_section, 0, ".objc_module_info", 1)
DEF_SECTION (objc_protocol_section, 0, ".objc_protocol", 1)
DEF_SECTION (objc_string_object_section, 0, ".objc_string_object", 1)
DEF_SECTION (objc_constant_string_object_section, 0,
	     ".section __OBJC, __cstring_object, regular, no_dead_strip", 0)

/* Fix-and-Continue image marker.  */
DEF_SECTION (objc_image_info_section, 0,
	     ".section __OBJC, __image_info, regular, no_dead_strip", 1)
DEF_SECTION (objc_class_names_section, 0, ".objc_class_names", 1)
DEF_SECTION (objc_meth_var_names_section, 0, ".objc_meth_var_names", 1)
DEF_SECTION (objc_meth_var_types_section, 0, ".objc_meth_var_types", 1)
DEF_SECTION (objc_cls_refs_section, SECTION_MERGE, ".objc_cls_refs", 1)

/* Stubs and symbol indirection sections.  */
/* lazy symbol pointers.  */
DEF_SECTION (machopic_lazy_symbol_ptr_section, SECTION_NO_ANCHOR, 
	     ".lazy_symbol_pointer", 0)
DEF_SECTION (machopic_lazy_symbol_ptr2_section,	SECTION_NO_ANCHOR,
	     ".section __DATA, __la_sym_ptr2,lazy_symbol_pointers", 0)
DEF_SECTION (machopic_lazy_symbol_ptr3_section, SECTION_NO_ANCHOR,
	     ".section __DATA, __la_sym_ptr3,lazy_symbol_pointers", 0)
/* non-lazy symbol pointers.  */
DEF_SECTION (machopic_nl_symbol_ptr_section, SECTION_NO_ANCHOR,
	     MACHOPIC_NL_SYMBOL_PTR_SECTION, 0)
/* Symbol stubs.  */
DEF_SECTION (machopic_symbol_stub_section, SECTION_NO_ANCHOR, 
	     ".symbol_stub", 0)
DEF_SECTION (machopic_symbol_stub1_section, SECTION_NO_ANCHOR,
	     ".section __TEXT,__symbol_stub1,symbol_stubs,"
	     "pure_instructions,16", 0)
/* PIC symbol stubs.  */
DEF_SECTION (machopic_picsymbol_stub_section, SECTION_NO_ANCHOR, 
	     ".picsymbol_stub", 0)
DEF_SECTION (machopic_picsymbol_stub1_section, SECTION_NO_ANCHOR,
	     ".section __TEXT,__picsymbolstub1,symbol_stubs,"
	     "pure_instructions,32", 0)
DEF_SECTION (machopic_picsymbol_stub2_section, SECTION_NO_ANCHOR,
	     ".section __TEXT,__picsymbolstub2,symbol_stubs,pure_instructions,25", 0)
DEF_SECTION (machopic_picsymbol_stub3_section, SECTION_NO_ANCHOR,
	     ".section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5", 0)

/* Exception-related.  */
DEF_SECTION (darwin_exception_section, SECTION_NO_ANCHOR,
	     ".section __DATA,__gcc_except_tab", 0)
DEF_SECTION (darwin_eh_frame_section, SECTION_NO_ANCHOR,
	     ".section " EH_FRAME_SECTION_NAME ",__eh_frame"
	     EH_FRAME_SECTION_ATTR, 0)

/* Sections for ObjC ABI=1 (ObjC 'V1' extensions) */
DEF_SECTION (objc1_class_ext_section, 0,
	    ".section __OBJC, __class_ext, regular, no_dead_strip", 1)
DEF_SECTION (objc1_prop_list_section, 0,
	    ".section __OBJC, __property, regular, no_dead_strip", 1)
DEF_SECTION (objc1_protocol_ext_section, 0,
	    ".section __OBJC, __protocol_ext, regular, no_dead_strip", 1)

/* Sections for ObjC ABI=2 (m64).  */
DEF_SECTION (objc2_message_refs_section, 0,
	     ".section __DATA, __objc_msgrefs, regular, no_dead_strip", 1)
DEF_SECTION (objc2_classdefs_section, 0, ".section __DATA, __objc_data", 1)
DEF_SECTION (objc2_metadata_section, 0, ".section __DATA, __objc_const", 1)

DEF_SECTION (objc2_classrefs_section, 0, 
             ".section __DATA, __objc_classrefs, regular, no_dead_strip", 1)
DEF_SECTION (objc2_classlist_section, 0,
	     ".section __DATA, __objc_classlist, regular, no_dead_strip", 1)
DEF_SECTION (objc2_categorylist_section, 0,
	     ".section __DATA, __objc_catlist, regular, no_dead_strip", 1)
DEF_SECTION (objc2_selector_refs_section, 0,
	     ".section __DATA, __objc_selrefs, literal_pointers, no_dead_strip", 1)
DEF_SECTION (objc2_nonlazy_class_section, 0,
	     ".section __DATA, __objc_nlclslist, regular, no_dead_strip", 1)
DEF_SECTION (objc2_nonlazy_category_section, 0,
	     ".section __DATA, __objc_nlcatlist, regular, no_dead_strip", 1)
DEF_SECTION (objc2_protocollist_section, 0,
	     ".section __DATA, __objc_protolist, regular, no_dead_strip", 1)
DEF_SECTION (objc2_protocolrefs_section, 0,
	     ".section __DATA, __objc_protorefs, regular, no_dead_strip", 1)
DEF_SECTION (objc2_super_classrefs_section, 0,
	     ".section __DATA, __objc_superrefs, regular, no_dead_strip", 1)
DEF_SECTION (objc2_image_info_section, 0,
	     ".section __DATA, __objc_imageinfo, regular, no_dead_strip", 1)
DEF_SECTION (objc2_constant_string_object_section, 0,
	     ".section __DATA, __objc_stringobj, regular, no_dead_strip", 1)

/* Additions for compatibility with later runtime conventions especially for
   sections containing strings.  */
DEF_SECTION (objc2_data_section, 0, ".section __DATA, __data", 1)

DEF_SECTION (objc2_ivar_section, 0, ".section __DATA, __objc_ivar", 1)

DEF_SECTION (objc2_class_names_section, 0,
	     ".section __TEXT, __objc_classname, cstring_literals", 1)

DEF_SECTION (objc2_method_names_section, 0,
	     ".section __TEXT, __objc_methname, cstring_literals", 1)

DEF_SECTION (objc2_method_types_section, 0,
	     ".section __TEXT, __objc_methtype, cstring_literals", 1)