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709 |
jeremybenn |
/* Copyright (C) 2005, 2006, 2010 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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. */
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/* Since Darwin's ld will not allow zero-sized objects, and gcc wants them,
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we emit one byte (in darwin.c) when such an object is encountered.
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This messes up section anchoring because the emitted byte is not counted
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outside the port. To cope with this, we set aside sections for zero-sized
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objects and disallow those sections from participating in section anchors
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("zobj_" sections, below).
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Items that might be coalesced by the linker are prevented from participating,
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(and those in mergeable sections are disallowed in varasm.c). */
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/* The .text section is generated in varasm.c */
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DEF_SECTION (text_coal_section, SECTION_CODE|SECTION_NO_ANCHOR,
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".section __TEXT,__textcoal_nt,coalesced,pure_instructions", 0)
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DEF_SECTION (text_hot_section, SECTION_CODE,
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".section __TEXT,__text_hot,regular,pure_instructions", 0)
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DEF_SECTION (text_cold_section, SECTION_CODE,
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".section __TEXT,__text_cold,regular,pure_instructions", 0)
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DEF_SECTION (text_startup_section, SECTION_CODE,
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".section __TEXT,__text_startup,regular,pure_instructions", 0)
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DEF_SECTION (text_exit_section, SECTION_CODE,
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".section __TEXT,__text_exit,regular,pure_instructions", 0)
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DEF_SECTION (text_hot_coal_section, SECTION_CODE,
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".section __TEXT,__text_hot_coal,coalesced,pure_instructions", 0)
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DEF_SECTION (text_cold_coal_section, SECTION_CODE,
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".section __TEXT,__text_cold_coal,coalesced,pure_instructions", 0)
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DEF_SECTION (text_startup_coal_section, SECTION_CODE,
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".section __TEXT,__text_stt_coal,coalesced,pure_instructions", 0)
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DEF_SECTION (text_exit_coal_section, SECTION_CODE,
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".section __TEXT,__text_exit_coal,coalesced,pure_instructions", 0)
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/* const */
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DEF_SECTION (const_section, 0, ".const", 0)
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DEF_SECTION (const_coal_section, SECTION_NO_ANCHOR,
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".section __TEXT,__const_coal,coalesced", 0)
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/* Place to put zero-sized to avoid issues with section anchors. */
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DEF_SECTION (zobj_const_section, SECTION_NO_ANCHOR,
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".section\t__DATA,__zobj_const", 0)
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/* Write-able data. '.data' handled in varasm.c */
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DEF_SECTION (static_data_section, SECTION_WRITE, ".static_data", 0)
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DEF_SECTION (data_coal_section, SECTION_WRITE|SECTION_NO_ANCHOR,
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".section __DATA,__datacoal_nt,coalesced", 0)
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/* Place to put zero-sized to avoid issues with section anchors. */
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DEF_SECTION (zobj_data_section, SECTION_WRITE|SECTION_NO_ANCHOR,
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".section\t__DATA,__zobj_data", 0)
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/* BSS - .lcomm / .zerofill __DATA,__bss sections cannot be switched to
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explicitly (will create an assembler error). */
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DEF_SECTION (zobj_bss_section, SECTION_WRITE|SECTION_BSS|SECTION_NO_ANCHOR,
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".section\t__DATA,__zobj_bss", 0)
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/* const data */
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DEF_SECTION (const_data_section, 0, ".const_data", 0)
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DEF_SECTION (const_data_coal_section, SECTION_NO_ANCHOR,
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".section __DATA,__const_coal,coalesced", 0)
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/* Place to put zero-sized to avoid issues with section anchors. */
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DEF_SECTION (zobj_const_data_section, SECTION_NO_ANCHOR,
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".section\t__DATA,__zobj_cnst_data", 0)
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/* Strings and other literals. */
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DEF_SECTION (cstring_section, SECTION_MERGE | SECTION_STRINGS, ".cstring", 0)
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DEF_SECTION (literal4_section, SECTION_MERGE, ".literal4", 0)
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DEF_SECTION (literal8_section, SECTION_MERGE, ".literal8", 0)
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DEF_SECTION (literal16_section, SECTION_MERGE, ".literal16", 0)
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/* Unlike constant NSStrings, constant CFStrings do not live in the
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__OBJC segment since they may also occur in pure C or C++ programs. */
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DEF_SECTION (cfstring_constant_object_section, 0,
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".section __DATA, __cfstring", 0)
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/* Module init, term, constructors & destructors. */
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DEF_SECTION (mod_init_section, 0, ".mod_init_func", 0)
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DEF_SECTION (mod_term_section, 0, ".mod_term_func", 0)
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DEF_SECTION (constructor_section, 0, ".constructor", 0)
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DEF_SECTION (destructor_section, 0, ".destructor", 0)
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/* Objective-C ABI=0 (Original version) sections. */
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DEF_SECTION (objc_class_section, 0, ".objc_class", 1)
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DEF_SECTION (objc_meta_class_section, 0, ".objc_meta_class", 1)
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DEF_SECTION (objc_category_section, 0, ".objc_category", 1)
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DEF_SECTION (objc_class_vars_section, 0, ".objc_class_vars", 1)
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DEF_SECTION (objc_instance_vars_section, 0, ".objc_instance_vars", 1)
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DEF_SECTION (objc_cls_meth_section, 0, ".objc_cls_meth", 1)
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DEF_SECTION (objc_inst_meth_section, 0, ".objc_inst_meth", 1)
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DEF_SECTION (objc_cat_cls_meth_section, 0, ".objc_cat_cls_meth", 1)
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DEF_SECTION (objc_cat_inst_meth_section, 0, ".objc_cat_inst_meth", 1)
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DEF_SECTION (objc_selector_refs_section, SECTION_MERGE, ".objc_message_refs", 1)
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DEF_SECTION (objc_selector_fixup_section, 0,
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".section __OBJC, __sel_fixup, regular, no_dead_strip", 1)
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DEF_SECTION (objc_symbols_section, 0, ".objc_symbols", 1)
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DEF_SECTION (objc_module_info_section, 0, ".objc_module_info", 1)
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DEF_SECTION (objc_protocol_section, 0, ".objc_protocol", 1)
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DEF_SECTION (objc_string_object_section, 0, ".objc_string_object", 1)
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DEF_SECTION (objc_constant_string_object_section, 0,
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".section __OBJC, __cstring_object, regular, no_dead_strip", 0)
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/* Fix-and-Continue image marker. */
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DEF_SECTION (objc_image_info_section, 0,
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".section __OBJC, __image_info, regular, no_dead_strip", 1)
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DEF_SECTION (objc_class_names_section, 0, ".objc_class_names", 1)
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DEF_SECTION (objc_meth_var_names_section, 0, ".objc_meth_var_names", 1)
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DEF_SECTION (objc_meth_var_types_section, 0, ".objc_meth_var_types", 1)
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DEF_SECTION (objc_cls_refs_section, SECTION_MERGE, ".objc_cls_refs", 1)
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/* Stubs and symbol indirection sections. */
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/* lazy symbol pointers. */
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DEF_SECTION (machopic_lazy_symbol_ptr_section, SECTION_NO_ANCHOR,
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".lazy_symbol_pointer", 0)
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DEF_SECTION (machopic_lazy_symbol_ptr2_section, SECTION_NO_ANCHOR,
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".section __DATA, __la_sym_ptr2,lazy_symbol_pointers", 0)
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DEF_SECTION (machopic_lazy_symbol_ptr3_section, SECTION_NO_ANCHOR,
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".section __DATA, __la_sym_ptr3,lazy_symbol_pointers", 0)
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/* non-lazy symbol pointers. */
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DEF_SECTION (machopic_nl_symbol_ptr_section, SECTION_NO_ANCHOR,
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MACHOPIC_NL_SYMBOL_PTR_SECTION, 0)
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/* Symbol stubs. */
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DEF_SECTION (machopic_symbol_stub_section, SECTION_NO_ANCHOR,
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".symbol_stub", 0)
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DEF_SECTION (machopic_symbol_stub1_section, SECTION_NO_ANCHOR,
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".section __TEXT,__symbol_stub1,symbol_stubs,"
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"pure_instructions,16", 0)
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/* PIC symbol stubs. */
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DEF_SECTION (machopic_picsymbol_stub_section, SECTION_NO_ANCHOR,
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".picsymbol_stub", 0)
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DEF_SECTION (machopic_picsymbol_stub1_section, SECTION_NO_ANCHOR,
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".section __TEXT,__picsymbolstub1,symbol_stubs,"
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"pure_instructions,32", 0)
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DEF_SECTION (machopic_picsymbol_stub2_section, SECTION_NO_ANCHOR,
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".section __TEXT,__picsymbolstub2,symbol_stubs,pure_instructions,25", 0)
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DEF_SECTION (machopic_picsymbol_stub3_section, SECTION_NO_ANCHOR,
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".section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5", 0)
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/* Exception-related. */
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DEF_SECTION (darwin_exception_section, SECTION_NO_ANCHOR,
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".section __DATA,__gcc_except_tab", 0)
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DEF_SECTION (darwin_eh_frame_section, SECTION_NO_ANCHOR,
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".section " EH_FRAME_SECTION_NAME ",__eh_frame"
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EH_FRAME_SECTION_ATTR, 0)
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/* Sections for ObjC ABI=1 (ObjC 'V1' extensions) */
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DEF_SECTION (objc1_class_ext_section, 0,
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".section __OBJC, __class_ext, regular, no_dead_strip", 1)
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DEF_SECTION (objc1_prop_list_section, 0,
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".section __OBJC, __property, regular, no_dead_strip", 1)
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DEF_SECTION (objc1_protocol_ext_section, 0,
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".section __OBJC, __protocol_ext, regular, no_dead_strip", 1)
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/* Sections for ObjC ABI=2 (m64). */
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DEF_SECTION (objc2_message_refs_section, 0,
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".section __DATA, __objc_msgrefs, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_classdefs_section, 0, ".section __DATA, __objc_data", 1)
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DEF_SECTION (objc2_metadata_section, 0, ".section __DATA, __objc_const", 1)
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DEF_SECTION (objc2_classrefs_section, 0,
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".section __DATA, __objc_classrefs, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_classlist_section, 0,
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".section __DATA, __objc_classlist, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_categorylist_section, 0,
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".section __DATA, __objc_catlist, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_selector_refs_section, 0,
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".section __DATA, __objc_selrefs, literal_pointers, no_dead_strip", 1)
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DEF_SECTION (objc2_nonlazy_class_section, 0,
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".section __DATA, __objc_nlclslist, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_nonlazy_category_section, 0,
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".section __DATA, __objc_nlcatlist, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_protocollist_section, 0,
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".section __DATA, __objc_protolist, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_protocolrefs_section, 0,
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".section __DATA, __objc_protorefs, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_super_classrefs_section, 0,
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".section __DATA, __objc_superrefs, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_image_info_section, 0,
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".section __DATA, __objc_imageinfo, regular, no_dead_strip", 1)
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DEF_SECTION (objc2_constant_string_object_section, 0,
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".section __DATA, __objc_stringobj, regular, no_dead_strip", 1)
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