3881 lines
118 KiB
C
3881 lines
118 KiB
C
/* Functions for generic Darwin as target machine for GNU C compiler.
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Copyright (C) 1989-2021 Free Software Foundation, Inc.
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Contributed by Apple Computer 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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "backend.h"
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#include "target.h"
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#include "rtl.h"
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#include "tree.h"
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#include "gimple.h"
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#include "cfghooks.h"
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#include "df.h"
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#include "memmodel.h"
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#include "tm_p.h"
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#include "stringpool.h"
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#include "attribs.h"
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#include "insn-config.h"
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#include "emit-rtl.h"
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#include "cgraph.h"
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#include "lto-streamer.h"
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#include "output.h"
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#include "varasm.h"
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#include "stor-layout.h"
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#include "explow.h"
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#include "expr.h"
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#include "langhooks.h"
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#include "toplev.h"
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#include "lto-section-names.h"
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#include "intl.h"
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#include "optabs.h"
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/* Fix and Continue.
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NOTES:
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1) this facility requires suitable support from a modified version
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of GDB, which is not provided on any system after MacOS 10.7/Darwin11.
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2) There is no support for this in any X86 version of the FSF compiler.
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Fix and continue was used on some earlier MacOS systems for rapid turn
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around debugging. When code is compiled with the -mfix-and-continue
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flag, two changes are made to the generated code that allow the system
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to do things that it would normally not be able to do easily. These
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changes allow gdb to load in recompilation of a translation unit that
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has been changed into a running program and replace existing functions
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and methods of that translation unit with versions of those functions
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and methods from the newly compiled translation unit. The new functions
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access the existing static symbols from the old translation unit, if the
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symbol existed in the unit to be replaced, and from the new translation
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unit, otherwise.
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The changes are to insert 5 nops at the beginning of all functions
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and to use indirection to get at static symbols. The 5 nops
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are required by consumers of the generated code. Currently, gdb
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uses this to patch in a jump to the overriding function, this
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allows all uses of the old name to forward to the replacement,
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including existing function pointers and virtual methods. See
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rs6000_emit_prologue for the code that handles the nop insertions.
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The added indirection allows gdb to redirect accesses to static
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symbols from the newly loaded translation unit to the existing
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symbol, if any. @code{static} symbols are special and are handled by
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setting the second word in the .non_lazy_symbol_pointer data
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structure to symbol. See indirect_data for the code that handles
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the extra indirection, and machopic_output_indirection and its use
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of MACHO_SYMBOL_FLAG_STATIC for the code that handles @code{static}
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symbol indirection. */
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typedef struct GTY(()) cdtor_record {
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rtx symbol;
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int priority; /* [con/de]structor priority */
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int position; /* original position */
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} cdtor_record;
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static GTY(()) vec<cdtor_record, va_gc> *ctors = NULL;
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static GTY(()) vec<cdtor_record, va_gc> *dtors = NULL;
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/* A flag to determine whether we are running c++ or obj-c++. This has to be
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settable from non-c-family contexts too (i.e. we can't use the c_dialect_
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functions). */
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int darwin_running_cxx;
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/* Some code-gen now depends on OS major version numbers (at least). */
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int generating_for_darwin_version ;
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/* For older linkers we need to emit special sections (marked 'coalesced') for
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for weak or single-definition items. */
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static bool ld_uses_coal_sects = false;
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/* Very old (ld_classic) linkers need a symbol to mark the start of
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each FDE. */
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static bool ld_needs_eh_markers = false;
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/* Emit a section-start symbol for mod init and term sections. */
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static bool ld_init_term_start_labels = false;
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/* Section names. */
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section * darwin_sections[NUM_DARWIN_SECTIONS];
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/* While we transition to using in-tests instead of ifdef'd code. */
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#if !HAVE_lo_sum
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#define gen_macho_high(m,a,b) (a)
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#define gen_macho_low(m,a,b,c) (a)
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#endif
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/* True if we're setting __attribute__ ((ms_struct)). */
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int darwin_ms_struct = false;
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/* Earlier versions of Darwin as do not recognize an alignment field in
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.comm directives, this should be set for versions that allow it. */
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int emit_aligned_common = false;
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/* A get_unnamed_section callback used to switch to an ObjC section.
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DIRECTIVE is as for output_section_asm_op. */
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static void
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output_objc_section_asm_op (const void *directive)
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{
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static bool been_here = false;
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/* The NeXT ObjC Runtime requires these sections to be present and in
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order in the object. The code below implements this by emitting
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a section header for each ObjC section the first time that an ObjC
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section is requested. */
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if (darwin_symbol_stubs && ! been_here)
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{
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section *saved_in_section = in_section;
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static const enum darwin_section_enum tomark[] =
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{
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/* written, cold -> hot */
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objc_cat_cls_meth_section,
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objc_cat_inst_meth_section,
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objc_string_object_section,
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objc_constant_string_object_section,
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objc_selector_refs_section,
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objc_selector_fixup_section,
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objc_cls_refs_section,
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objc_class_section,
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objc_meta_class_section,
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/* shared, hot -> cold */
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objc_cls_meth_section,
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objc_inst_meth_section,
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objc_protocol_section,
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objc_class_names_section,
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objc_meth_var_types_section,
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objc_meth_var_names_section,
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objc_category_section,
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objc_class_vars_section,
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objc_instance_vars_section,
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objc_module_info_section,
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objc_symbols_section,
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};
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/* ABI=1 */
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static const enum darwin_section_enum tomarkv1[] =
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{
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objc1_protocol_ext_section,
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objc1_class_ext_section,
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objc1_prop_list_section
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} ;
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/* ABI=2 */
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static const enum darwin_section_enum tomarkv2[] =
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{
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objc2_method_names_section,
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objc2_message_refs_section,
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objc2_selector_refs_section,
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objc2_ivar_section,
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objc2_classdefs_section,
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objc2_metadata_section,
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objc2_classrefs_section,
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objc2_class_names_section,
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objc2_classlist_section,
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objc2_categorylist_section,
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objc2_nonlazy_class_section,
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objc2_nonlazy_category_section,
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objc2_protocollist_section,
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objc2_protocolrefs_section,
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objc2_super_classrefs_section,
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objc2_constant_string_object_section,
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objc2_image_info_section,
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} ;
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size_t i;
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been_here = true;
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if (flag_objc_abi < 2)
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{
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for (i = 0; i < ARRAY_SIZE (tomark); i++)
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switch_to_section (darwin_sections[tomark[i]]);
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if (flag_objc_abi == 1)
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for (i = 0; i < ARRAY_SIZE (tomarkv1); i++)
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switch_to_section (darwin_sections[tomarkv1[i]]);
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}
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else
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for (i = 0; i < ARRAY_SIZE (tomarkv2); i++)
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switch_to_section (darwin_sections[tomarkv2[i]]);
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/* Make sure we don't get varasm.c out of sync with us. */
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switch_to_section (saved_in_section);
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}
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output_section_asm_op (directive);
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}
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/* Private flag applied to disable section-anchors in a particular section. */
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#define SECTION_NO_ANCHOR SECTION_MACH_DEP
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/* Implement TARGET_ASM_INIT_SECTIONS. */
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void
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darwin_init_sections (void)
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{
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#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
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darwin_sections[NAME] = \
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get_unnamed_section (FLAGS, (OBJC \
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? output_objc_section_asm_op \
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: output_section_asm_op), \
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"\t" DIRECTIVE);
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#include "config/darwin-sections.def"
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#undef DEF_SECTION
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readonly_data_section = darwin_sections[const_section];
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exception_section = darwin_sections[darwin_exception_section];
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eh_frame_section = darwin_sections[darwin_eh_frame_section];
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/* If our linker is new enough to coalesce weak symbols, then we
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can just put picbase_thunks into the text section. */
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if (! ld_uses_coal_sects )
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darwin_sections[picbase_thunk_section] = text_section;
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}
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int
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name_needs_quotes (const char *name)
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{
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int c;
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while ((c = *name++) != '\0')
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if (! ISIDNUM (c)
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&& c != '.' && c != '$' && c != '_' )
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return 1;
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return 0;
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}
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/* Return true if SYM_REF can be used without an indirection. */
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int
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machopic_symbol_defined_p (rtx sym_ref)
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{
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if (MACHO_SYMBOL_DEFINED_P (sym_ref))
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return true;
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/* If a symbol references local and is not an extern to this
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file, then the symbol might be able to declared as defined. */
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if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
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{
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/* If the symbol references a variable and the variable is a
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common symbol, then this symbol is not defined. */
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if (MACHO_SYMBOL_VARIABLE_P (sym_ref))
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{
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tree decl = SYMBOL_REF_DECL (sym_ref);
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if (!decl)
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return true;
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if (DECL_COMMON (decl))
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return false;
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}
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return true;
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}
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return false;
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}
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/* This module assumes that (const (symbol_ref "foo")) is a legal pic
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reference, which will not be changed. */
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enum machopic_addr_class
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machopic_classify_symbol (rtx sym_ref)
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{
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bool function_p;
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function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
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if (machopic_symbol_defined_p (sym_ref))
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return (function_p
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? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
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else
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return (function_p
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? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
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}
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#ifndef TARGET_FIX_AND_CONTINUE
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#define TARGET_FIX_AND_CONTINUE 0
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#endif
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/* Indicate when fix-and-continue style code generation is being used
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and when a reference to data should be indirected so that it can be
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rebound in a new translation unit to reference the original instance
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of that data. Symbol names that are for code generation local to
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the translation unit are bound to the new translation unit;
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currently this means symbols that begin with L or _OBJC_;
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otherwise, we indicate that an indirect reference should be made to
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permit the runtime to rebind new instances of the translation unit
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to the original instance of the data. */
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static int
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indirect_data (rtx sym_ref)
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{
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int lprefix;
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const char *name;
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/* If we aren't generating fix-and-continue code, don't do anything
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special. */
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if (TARGET_FIX_AND_CONTINUE == 0)
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return 0;
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/* Otherwise, all symbol except symbols that begin with L or _OBJC_
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are indirected. Symbols that begin with L and _OBJC_ are always
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bound to the current translation unit as they are used for
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generated local data of the translation unit. */
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name = XSTR (sym_ref, 0);
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lprefix = (((name[0] == '*' || name[0] == '&')
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&& (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
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|| (strncmp (name, "_OBJC_", 6) == 0));
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return ! lprefix;
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}
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static int
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machopic_data_defined_p (rtx sym_ref)
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{
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if (indirect_data (sym_ref))
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return 0;
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switch (machopic_classify_symbol (sym_ref))
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{
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case MACHOPIC_DEFINED_DATA:
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case MACHOPIC_DEFINED_FUNCTION:
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return 1;
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default:
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return 0;
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}
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}
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void
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machopic_define_symbol (rtx mem)
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{
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rtx sym_ref;
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gcc_assert (GET_CODE (mem) == MEM);
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sym_ref = XEXP (mem, 0);
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SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
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}
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/* Return either ORIG or:
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(const:P (unspec:P [ORIG] UNSPEC_MACHOPIC_OFFSET))
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depending on MACHO_DYNAMIC_NO_PIC_P. */
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rtx
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machopic_gen_offset (rtx orig)
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{
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if (MACHO_DYNAMIC_NO_PIC_P)
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return orig;
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else
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{
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/* Play games to avoid marking the function as needing pic if we
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are being called as part of the cost-estimation process. */
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if (current_ir_type () != IR_GIMPLE || currently_expanding_to_rtl)
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crtl->uses_pic_offset_table = 1;
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orig = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, orig),
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UNSPEC_MACHOPIC_OFFSET);
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return gen_rtx_CONST (Pmode, orig);
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}
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}
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static GTY(()) const char * function_base_func_name = NULL;
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static GTY(()) unsigned current_pic_label_num = 0;
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static GTY(()) unsigned emitted_pic_label_num = 0;
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/* We need to keep one picbase label per function, but (when we emit code
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to reload the picbase for setjump receiver) we might need to check for
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a second use. So, only update the picbase label counter when we see a
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new function. When there's no function decl, we assume that the call is
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from the x86 stub generation code. */
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static void
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update_pic_label_number_if_needed (void)
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{
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if (current_function_decl)
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{
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const char *current_name =
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IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
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if (function_base_func_name != current_name)
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{
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++current_pic_label_num;
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function_base_func_name = current_name;
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}
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}
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else
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{
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++current_pic_label_num;
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function_base_func_name = "L_machopic_stub_dummy";
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}
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}
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void
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machopic_output_function_base_name (FILE *file)
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{
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/* We should only get here for -fPIC. */
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gcc_checking_assert (MACHOPIC_PURE);
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update_pic_label_number_if_needed ();
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fprintf (file, "L%u$pb", current_pic_label_num);
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}
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char curr_picbasename[32];
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const char *
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machopic_get_function_picbase (void)
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{
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/* We should only get here for -fPIC. */
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gcc_checking_assert (MACHOPIC_PURE);
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update_pic_label_number_if_needed ();
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snprintf (curr_picbasename, 32, "L%u$pb", current_pic_label_num);
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return (const char *) curr_picbasename;
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}
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bool
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machopic_should_output_picbase_label (void)
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{
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update_pic_label_number_if_needed ();
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if (current_pic_label_num == emitted_pic_label_num)
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return false;
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emitted_pic_label_num = current_pic_label_num;
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return true;
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}
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/* The suffix attached to non-lazy pointer symbols. */
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#define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
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/* The suffix attached to stub symbols. */
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#define STUB_SUFFIX "$stub"
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typedef struct GTY ((for_user)) machopic_indirection
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{
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/* The SYMBOL_REF for the entity referenced. */
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rtx symbol;
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/* The name of the stub or non-lazy pointer. */
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const char * ptr_name;
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/* True iff this entry is for a stub (as opposed to a non-lazy
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pointer). */
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bool stub_p;
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/* True iff this stub or pointer has been referenced. */
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bool used;
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/* True iff a non-lazy symbol pointer should be emitted into the .data
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section, rather than the non-lazy symbol pointers section. The cases
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for which this occurred seem to have been unintentional, and later
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toolchains emit all of the indirections to the 'usual' section. We
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are keeping this in case it is necessary to preserve compatibility with
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older toolchains. */
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bool nlsp_in_data_section;
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} machopic_indirection;
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struct indirection_hasher : ggc_ptr_hash<machopic_indirection>
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{
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typedef const char *compare_type;
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static hashval_t hash (machopic_indirection *);
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static bool equal (machopic_indirection *, const char *);
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};
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/* A table mapping stub names and non-lazy pointer names to
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SYMBOL_REFs for the stubbed-to and pointed-to entities. */
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static GTY (()) hash_table<indirection_hasher> *machopic_indirections;
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/* Return a hash value for a SLOT in the indirections hash table. */
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hashval_t
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indirection_hasher::hash (machopic_indirection *p)
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{
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return htab_hash_string (p->ptr_name);
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}
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/* Returns true if the KEY is the same as that associated with
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SLOT. */
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bool
|
|
indirection_hasher::equal (machopic_indirection *s, const char *k)
|
|
{
|
|
return strcmp (s->ptr_name, k) == 0;
|
|
}
|
|
|
|
/* Return the name of the non-lazy pointer (if STUB_P is false) or
|
|
stub (if STUB_B is true) corresponding to the given name.
|
|
|
|
PR71767 - If we have a situation like:
|
|
|
|
global_weak_symbol:
|
|
....
|
|
Lnon_weak_local:
|
|
....
|
|
|
|
ld64 will be unable to split this into two atoms (because the "L" makes
|
|
the second symbol 'invisible'). This means that legitimate direct accesses
|
|
to the second symbol will appear to be direct accesses to an atom of type
|
|
weak, global which are not allowed.
|
|
|
|
To avoid this, we make any data-section indirections have a leading 'l'
|
|
(lower-case L) which has a special meaning: linker can see this and use
|
|
it to determine atoms, but it is not placed into the final symbol table.
|
|
|
|
Symbols in the non-lazy symbol pointers section (or stubs) do not have this
|
|
problem because ld64 already knows the size of each entry.
|
|
*/
|
|
|
|
const char *
|
|
machopic_indirection_name (rtx sym_ref, bool stub_p)
|
|
{
|
|
const char *name = XSTR (sym_ref, 0);
|
|
tree id = maybe_get_identifier (name);
|
|
if (id)
|
|
{
|
|
tree id_orig = id;
|
|
|
|
while (IDENTIFIER_TRANSPARENT_ALIAS (id))
|
|
id = TREE_CHAIN (id);
|
|
if (id != id_orig)
|
|
name = IDENTIFIER_POINTER (id);
|
|
}
|
|
|
|
const char *prefix = user_label_prefix;
|
|
/* If we are emitting the label 'verbatim' then omit the U_L_P and count
|
|
the name without the leading '*'. */
|
|
if (name[0] == '*')
|
|
{
|
|
prefix = "";
|
|
++name;
|
|
}
|
|
|
|
/* Here we are undoing a number of causes that placed some indirections
|
|
(apparently erroneously) into the .data section. Specifically, some
|
|
symbols that are ABI mandated indirections and some hidden symbols
|
|
were being placed there - which cause difficulties with later
|
|
versions of ld64. Iff (after these checks) some symbol still gets an
|
|
indirection in the data section, we want to adjust the indirection
|
|
name to be linker visible to deal with PR71767 (notes above). */
|
|
bool nlsp_in_data_section =
|
|
! MACHO_SYMBOL_MUST_INDIRECT_P (sym_ref)
|
|
&& ! MACHO_SYMBOL_HIDDEN_VIS_P (sym_ref)
|
|
&& (machopic_symbol_defined_p (sym_ref) || SYMBOL_REF_LOCAL_P (sym_ref))
|
|
&& ! indirect_data (sym_ref);
|
|
|
|
const char *suffix = stub_p ? STUB_SUFFIX : NON_LAZY_POINTER_SUFFIX;
|
|
/* If the indirection is in the data section, let the linker see it. */
|
|
char L_or_l = (!stub_p && nlsp_in_data_section) ? 'l' : 'L';
|
|
/* We have mangled symbols with spaces and punctuation which typically
|
|
need surrounding in quotes for the assembler to consume them. */
|
|
const char *quote = name_needs_quotes (name) ? "\"" : "";
|
|
char *buffer = XALLOCAVEC (char, 2 /* strlen ("&L") or ("&l") */
|
|
+ strlen (prefix)
|
|
+ strlen (name)
|
|
+ strlen (suffix)
|
|
+ 2 * strlen (quote)
|
|
+ 1 /* '\0' */);
|
|
|
|
/* Construct the name of the non-lazy pointer or stub. */
|
|
sprintf (buffer, "&%s%c%s%s%s%s", quote, L_or_l, prefix, name,
|
|
suffix, quote);
|
|
|
|
if (!machopic_indirections)
|
|
machopic_indirections = hash_table<indirection_hasher>::create_ggc (37);
|
|
|
|
machopic_indirection **slot
|
|
= machopic_indirections->find_slot_with_hash (buffer,
|
|
htab_hash_string (buffer),
|
|
INSERT);
|
|
machopic_indirection *p;
|
|
if (*slot)
|
|
p = *slot;
|
|
else
|
|
{
|
|
p = ggc_alloc<machopic_indirection> ();
|
|
p->symbol = sym_ref;
|
|
p->ptr_name = xstrdup (buffer);
|
|
p->stub_p = stub_p;
|
|
p->used = false;
|
|
p->nlsp_in_data_section = nlsp_in_data_section;
|
|
*slot = p;
|
|
}
|
|
|
|
return p->ptr_name;
|
|
}
|
|
|
|
/* If NAME is the name of a stub or a non-lazy pointer , mark the stub
|
|
or non-lazy pointer as used -- and mark the object to which the
|
|
pointer/stub refers as used as well, since the pointer/stub will
|
|
emit a reference to it. */
|
|
|
|
void
|
|
machopic_validate_stub_or_non_lazy_ptr (const char *name)
|
|
{
|
|
machopic_indirection *p
|
|
= machopic_indirections->find_with_hash (name, htab_hash_string (name));
|
|
if (p && ! p->used)
|
|
{
|
|
const char *real_name;
|
|
tree id;
|
|
|
|
p->used = true;
|
|
|
|
/* Do what output_addr_const will do when we actually call it. */
|
|
if (SYMBOL_REF_DECL (p->symbol))
|
|
mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
|
|
|
|
real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
|
|
|
|
id = maybe_get_identifier (real_name);
|
|
if (id)
|
|
mark_referenced (id);
|
|
}
|
|
}
|
|
|
|
/* Transform ORIG, which may be any data source, to the corresponding
|
|
source using indirections. */
|
|
|
|
rtx
|
|
machopic_indirect_data_reference (rtx orig, rtx reg)
|
|
{
|
|
rtx ptr_ref = orig;
|
|
|
|
if (! MACHOPIC_INDIRECT)
|
|
return orig;
|
|
|
|
if (GET_CODE (orig) == SYMBOL_REF)
|
|
{
|
|
int defined = machopic_data_defined_p (orig);
|
|
|
|
if (defined && MACHO_DYNAMIC_NO_PIC_P)
|
|
{
|
|
if (DARWIN_PPC)
|
|
{
|
|
/* Create a new register for CSE opportunities. */
|
|
rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode));
|
|
emit_insn (gen_macho_high (Pmode, hi_reg, orig));
|
|
emit_insn (gen_macho_low (Pmode, reg, hi_reg, orig));
|
|
return reg;
|
|
}
|
|
else if (DARWIN_X86)
|
|
return orig;
|
|
else
|
|
/* some other cpu -- writeme! */
|
|
gcc_unreachable ();
|
|
}
|
|
else if (defined && ! MACHO_SYMBOL_MUST_INDIRECT_P (orig))
|
|
{
|
|
rtx offset = NULL;
|
|
if (DARWIN_PPC || HAVE_lo_sum)
|
|
offset = machopic_gen_offset (orig);
|
|
|
|
if (DARWIN_PPC)
|
|
{
|
|
rtx hi_sum_reg = (!can_create_pseudo_p ()
|
|
? reg
|
|
: gen_reg_rtx (Pmode));
|
|
|
|
gcc_assert (reg);
|
|
|
|
emit_insn (gen_rtx_SET (hi_sum_reg,
|
|
gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
|
|
gen_rtx_HIGH (Pmode, offset))));
|
|
emit_insn (gen_rtx_SET (reg,
|
|
gen_rtx_LO_SUM (Pmode, hi_sum_reg,
|
|
copy_rtx (offset))));
|
|
|
|
orig = reg;
|
|
}
|
|
else if (HAVE_lo_sum)
|
|
{
|
|
gcc_assert (reg);
|
|
|
|
emit_insn (gen_rtx_SET (reg, gen_rtx_HIGH (Pmode, offset)));
|
|
emit_insn (gen_rtx_SET (reg, gen_rtx_LO_SUM (Pmode, reg,
|
|
copy_rtx (offset))));
|
|
emit_use (pic_offset_table_rtx);
|
|
|
|
orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
|
|
}
|
|
return orig;
|
|
}
|
|
|
|
ptr_ref = (gen_rtx_SYMBOL_REF
|
|
(Pmode,
|
|
machopic_indirection_name (orig, /*stub_p=*/false)));
|
|
|
|
SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);
|
|
SYMBOL_REF_FLAGS (ptr_ref) |= MACHO_SYMBOL_FLAG_INDIRECTION;
|
|
|
|
ptr_ref = gen_const_mem (Pmode, ptr_ref);
|
|
machopic_define_symbol (ptr_ref);
|
|
|
|
if (DARWIN_X86
|
|
&& reg
|
|
&& MACHO_DYNAMIC_NO_PIC_P)
|
|
{
|
|
emit_insn (gen_rtx_SET (reg, ptr_ref));
|
|
ptr_ref = reg;
|
|
}
|
|
|
|
return ptr_ref;
|
|
}
|
|
else if (GET_CODE (orig) == CONST)
|
|
{
|
|
/* If "(const (plus ...", walk the PLUS and return that result.
|
|
PLUS processing (below) will restore the "(const ..." if
|
|
appropriate. */
|
|
if (GET_CODE (XEXP (orig, 0)) == PLUS)
|
|
return machopic_indirect_data_reference (XEXP (orig, 0), reg);
|
|
else
|
|
return orig;
|
|
}
|
|
else if (GET_CODE (orig) == MEM)
|
|
{
|
|
XEXP (ptr_ref, 0) =
|
|
machopic_indirect_data_reference (XEXP (orig, 0), reg);
|
|
return ptr_ref;
|
|
}
|
|
else if (GET_CODE (orig) == PLUS)
|
|
{
|
|
rtx base, result;
|
|
|
|
/* Legitimize both operands of the PLUS. */
|
|
base = machopic_indirect_data_reference (XEXP (orig, 0), reg);
|
|
orig = machopic_indirect_data_reference (XEXP (orig, 1),
|
|
(base == reg ? 0 : reg));
|
|
if (MACHOPIC_INDIRECT && (GET_CODE (orig) == CONST_INT))
|
|
result = plus_constant (Pmode, base, INTVAL (orig));
|
|
else
|
|
result = gen_rtx_PLUS (Pmode, base, orig);
|
|
|
|
if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
|
|
{
|
|
if (reg)
|
|
{
|
|
emit_move_insn (reg, result);
|
|
result = reg;
|
|
}
|
|
else
|
|
{
|
|
result = force_reg (GET_MODE (result), result);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
return ptr_ref;
|
|
}
|
|
|
|
/* Transform TARGET (a MEM), which is a function call target, to the
|
|
corresponding symbol_stub if necessary. Return a new MEM. */
|
|
|
|
rtx
|
|
machopic_indirect_call_target (rtx target)
|
|
{
|
|
if (! darwin_symbol_stubs)
|
|
return target;
|
|
|
|
if (GET_CODE (target) != MEM)
|
|
return target;
|
|
|
|
if (MACHOPIC_INDIRECT
|
|
&& GET_CODE (XEXP (target, 0)) == SYMBOL_REF
|
|
&& ! MACHO_SYMBOL_DEFINED_P (XEXP (target, 0)))
|
|
{
|
|
rtx sym_ref = XEXP (target, 0);
|
|
const char *stub_name = machopic_indirection_name (sym_ref,
|
|
/*stub_p=*/true);
|
|
machine_mode mode = GET_MODE (sym_ref);
|
|
|
|
XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
|
|
SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
|
|
SYMBOL_REF_FLAGS (XEXP (target, 0)) |= MACHO_SYMBOL_FLAG_INDIRECTION;
|
|
MEM_READONLY_P (target) = 1;
|
|
MEM_NOTRAP_P (target) = 1;
|
|
}
|
|
|
|
return target;
|
|
}
|
|
|
|
rtx
|
|
machopic_legitimize_pic_address (rtx orig, machine_mode mode, rtx reg)
|
|
{
|
|
rtx pic_ref = orig;
|
|
|
|
if (! MACHOPIC_INDIRECT)
|
|
return orig;
|
|
|
|
/* First handle a simple SYMBOL_REF or LABEL_REF */
|
|
if (GET_CODE (orig) == LABEL_REF
|
|
|| GET_CODE (orig) == SYMBOL_REF)
|
|
{
|
|
/* addr(foo) = &func+(foo-func) */
|
|
orig = machopic_indirect_data_reference (orig, reg);
|
|
|
|
if (GET_CODE (orig) == PLUS
|
|
&& GET_CODE (XEXP (orig, 0)) == REG)
|
|
{
|
|
if (reg == 0)
|
|
return force_reg (mode, orig);
|
|
|
|
emit_move_insn (reg, orig);
|
|
return reg;
|
|
}
|
|
|
|
if (GET_CODE (orig) == MEM)
|
|
{
|
|
if (reg == 0)
|
|
{
|
|
gcc_assert (!lra_in_progress);
|
|
reg = gen_reg_rtx (Pmode);
|
|
}
|
|
|
|
#if HAVE_lo_sum
|
|
if (MACHO_DYNAMIC_NO_PIC_P
|
|
&& (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
|
|
|| GET_CODE (XEXP (orig, 0)) == LABEL_REF))
|
|
{
|
|
#if defined (TARGET_TOC) /* ppc */
|
|
rtx temp_reg = (!can_create_pseudo_p ()
|
|
? reg :
|
|
gen_reg_rtx (Pmode));
|
|
rtx asym = XEXP (orig, 0);
|
|
rtx mem;
|
|
|
|
emit_insn (gen_macho_high (Pmode, temp_reg, asym));
|
|
mem = gen_const_mem (GET_MODE (orig),
|
|
gen_rtx_LO_SUM (Pmode, temp_reg,
|
|
copy_rtx (asym)));
|
|
emit_insn (gen_rtx_SET (reg, mem));
|
|
#else
|
|
/* Some other CPU -- WriteMe! but right now there are no other
|
|
platforms that can use dynamic-no-pic */
|
|
gcc_unreachable ();
|
|
#endif
|
|
pic_ref = reg;
|
|
}
|
|
else
|
|
if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
|
|
|| GET_CODE (XEXP (orig, 0)) == LABEL_REF)
|
|
{
|
|
rtx offset = machopic_gen_offset (XEXP (orig, 0));
|
|
#if defined (TARGET_TOC) /* i.e., PowerPC */
|
|
/* Generating a new reg may expose opportunities for
|
|
common subexpression elimination. */
|
|
rtx hi_sum_reg = (!can_create_pseudo_p ()
|
|
? reg
|
|
: gen_reg_rtx (Pmode));
|
|
rtx mem;
|
|
rtx sum;
|
|
|
|
sum = gen_rtx_HIGH (Pmode, offset);
|
|
if (! MACHO_DYNAMIC_NO_PIC_P)
|
|
sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
|
|
|
|
emit_insn (gen_rtx_SET (hi_sum_reg, sum));
|
|
|
|
mem = gen_const_mem (GET_MODE (orig),
|
|
gen_rtx_LO_SUM (Pmode,
|
|
hi_sum_reg,
|
|
copy_rtx (offset)));
|
|
rtx_insn *insn = emit_insn (gen_rtx_SET (reg, mem));
|
|
set_unique_reg_note (insn, REG_EQUAL, pic_ref);
|
|
|
|
pic_ref = reg;
|
|
#else
|
|
emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM));
|
|
|
|
emit_insn (gen_rtx_SET (reg,
|
|
gen_rtx_HIGH (Pmode,
|
|
gen_rtx_CONST (Pmode,
|
|
offset))));
|
|
emit_insn (gen_rtx_SET (reg,
|
|
gen_rtx_LO_SUM (Pmode, reg,
|
|
gen_rtx_CONST (Pmode,
|
|
copy_rtx (offset)))));
|
|
pic_ref = gen_rtx_PLUS (Pmode,
|
|
pic_offset_table_rtx, reg);
|
|
#endif
|
|
}
|
|
else
|
|
#endif /* HAVE_lo_sum */
|
|
{
|
|
rtx pic = pic_offset_table_rtx;
|
|
if (GET_CODE (pic) != REG)
|
|
{
|
|
emit_move_insn (reg, pic);
|
|
pic = reg;
|
|
}
|
|
|
|
if (lra_in_progress && HARD_REGISTER_P (pic))
|
|
df_set_regs_ever_live (REGNO (pic), true);
|
|
pic_ref = gen_rtx_PLUS (Pmode, pic,
|
|
machopic_gen_offset (XEXP (orig, 0)));
|
|
}
|
|
|
|
#if !defined (TARGET_TOC)
|
|
emit_move_insn (reg, pic_ref);
|
|
pic_ref = gen_const_mem (GET_MODE (orig), reg);
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
|
|
#if HAVE_lo_sum
|
|
if (GET_CODE (orig) == SYMBOL_REF
|
|
|| GET_CODE (orig) == LABEL_REF)
|
|
{
|
|
rtx offset = machopic_gen_offset (orig);
|
|
#if defined (TARGET_TOC) /* i.e., PowerPC */
|
|
rtx hi_sum_reg;
|
|
|
|
if (reg == 0)
|
|
{
|
|
gcc_assert (!lra_in_progress);
|
|
reg = gen_reg_rtx (Pmode);
|
|
}
|
|
|
|
hi_sum_reg = reg;
|
|
|
|
emit_insn (gen_rtx_SET (hi_sum_reg,
|
|
(MACHO_DYNAMIC_NO_PIC_P)
|
|
? gen_rtx_HIGH (Pmode, offset)
|
|
: gen_rtx_PLUS (Pmode,
|
|
pic_offset_table_rtx,
|
|
gen_rtx_HIGH (Pmode,
|
|
offset))));
|
|
emit_insn (gen_rtx_SET (reg,
|
|
gen_rtx_LO_SUM (Pmode,
|
|
hi_sum_reg,
|
|
copy_rtx (offset))));
|
|
pic_ref = reg;
|
|
#else
|
|
emit_insn (gen_rtx_SET (reg, gen_rtx_HIGH (Pmode, offset)));
|
|
emit_insn (gen_rtx_SET (reg,
|
|
gen_rtx_LO_SUM (Pmode, reg,
|
|
copy_rtx (offset))));
|
|
pic_ref = gen_rtx_PLUS (Pmode,
|
|
pic_offset_table_rtx, reg);
|
|
#endif
|
|
}
|
|
else
|
|
#endif /* HAVE_lo_sum */
|
|
{
|
|
if (REG_P (orig)
|
|
|| GET_CODE (orig) == SUBREG)
|
|
{
|
|
return orig;
|
|
}
|
|
else
|
|
{
|
|
rtx pic = pic_offset_table_rtx;
|
|
if (GET_CODE (pic) != REG)
|
|
{
|
|
emit_move_insn (reg, pic);
|
|
pic = reg;
|
|
}
|
|
|
|
if (lra_in_progress && HARD_REGISTER_P (pic))
|
|
df_set_regs_ever_live (REGNO (pic), true);
|
|
pic_ref = gen_rtx_PLUS (Pmode,
|
|
pic,
|
|
machopic_gen_offset (orig));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (GET_CODE (pic_ref) != REG)
|
|
{
|
|
if (reg != 0)
|
|
{
|
|
emit_move_insn (reg, pic_ref);
|
|
return reg;
|
|
}
|
|
else
|
|
{
|
|
return force_reg (mode, pic_ref);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return pic_ref;
|
|
}
|
|
}
|
|
else if (GET_CODE (orig) == PLUS
|
|
&& (GET_CODE (XEXP (orig, 0)) == MEM
|
|
|| GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
|
|
|| GET_CODE (XEXP (orig, 0)) == LABEL_REF)
|
|
&& XEXP (orig, 0) != pic_offset_table_rtx
|
|
&& GET_CODE (XEXP (orig, 1)) != REG)
|
|
|
|
{
|
|
rtx base;
|
|
int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
|
|
|
|
base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
|
|
orig = machopic_legitimize_pic_address (XEXP (orig, 1),
|
|
Pmode, (base == reg ? 0 : reg));
|
|
if (GET_CODE (orig) == CONST_INT)
|
|
{
|
|
pic_ref = plus_constant (Pmode, base, INTVAL (orig));
|
|
is_complex = 1;
|
|
}
|
|
else
|
|
pic_ref = gen_rtx_PLUS (Pmode, base, orig);
|
|
|
|
if (reg && is_complex)
|
|
{
|
|
emit_move_insn (reg, pic_ref);
|
|
pic_ref = reg;
|
|
}
|
|
/* Likewise, should we set special REG_NOTEs here? */
|
|
}
|
|
else if (GET_CODE (orig) == CONST)
|
|
{
|
|
return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
|
|
}
|
|
else if (GET_CODE (orig) == MEM
|
|
&& GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
|
|
{
|
|
rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
|
|
addr = replace_equiv_address (orig, addr);
|
|
emit_move_insn (reg, addr);
|
|
pic_ref = reg;
|
|
}
|
|
|
|
return pic_ref;
|
|
}
|
|
|
|
/* Callbacks to output the stub or non-lazy pointers.
|
|
Each works on the item in *SLOT,if it has been used.
|
|
DATA is the FILE* for assembly output.
|
|
Called from htab_traverses, invoked from machopic_finish(). */
|
|
|
|
int
|
|
machopic_output_data_section_indirection (machopic_indirection **slot,
|
|
FILE *asm_out_file)
|
|
{
|
|
machopic_indirection *p = *slot;
|
|
|
|
if (!p->used || !p->nlsp_in_data_section)
|
|
return 1;
|
|
|
|
rtx symbol = p->symbol;
|
|
/* The original symbol name. */
|
|
const char *sym_name = XSTR (symbol, 0);
|
|
/* The name of the indirection symbol. */
|
|
const char *ptr_name = p->ptr_name;
|
|
|
|
switch_to_section (data_section);
|
|
assemble_align (GET_MODE_ALIGNMENT (Pmode));
|
|
assemble_label (asm_out_file, ptr_name);
|
|
assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
|
|
GET_MODE_SIZE (Pmode),
|
|
GET_MODE_ALIGNMENT (Pmode), 1);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
machopic_output_stub_indirection (machopic_indirection **slot,
|
|
FILE *asm_out_file)
|
|
{
|
|
machopic_indirection *p = *slot;
|
|
|
|
if (!p->used || !p->stub_p)
|
|
return 1;
|
|
|
|
rtx symbol = p->symbol;
|
|
/* The original symbol name. */
|
|
const char *sym_name = XSTR (symbol, 0);
|
|
/* The name of the stub symbol. */
|
|
const char *ptr_name = p->ptr_name;
|
|
|
|
tree id = maybe_get_identifier (sym_name);
|
|
if (id)
|
|
{
|
|
tree id_orig = id;
|
|
|
|
while (IDENTIFIER_TRANSPARENT_ALIAS (id))
|
|
id = TREE_CHAIN (id);
|
|
if (id != id_orig)
|
|
sym_name = IDENTIFIER_POINTER (id);
|
|
}
|
|
|
|
char *sym = XALLOCAVEC (char, strlen (sym_name) + 2);
|
|
if (sym_name[0] == '*' || sym_name[0] == '&')
|
|
strcpy (sym, sym_name + 1);
|
|
else if (sym_name[0] == '-' || sym_name[0] == '+')
|
|
strcpy (sym, sym_name);
|
|
else
|
|
sprintf (sym, "%s%s", user_label_prefix, sym_name);
|
|
|
|
char *stub = XALLOCAVEC (char, strlen (ptr_name) + 2);
|
|
if (ptr_name[0] == '*' || ptr_name[0] == '&')
|
|
strcpy (stub, ptr_name + 1);
|
|
else
|
|
sprintf (stub, "%s%s", user_label_prefix, ptr_name);
|
|
|
|
machopic_output_stub (asm_out_file, sym, stub);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
machopic_output_indirection (machopic_indirection **slot, FILE *asm_out_file)
|
|
{
|
|
machopic_indirection *p = *slot;
|
|
|
|
if (!p->used || p->stub_p || p->nlsp_in_data_section)
|
|
return 1;
|
|
|
|
rtx symbol = p->symbol;
|
|
/* The original symbol name. */
|
|
const char *sym_name = XSTR (symbol, 0);
|
|
/* The nonlazy-stub symbol name. */
|
|
const char *ptr_name = p->ptr_name;
|
|
|
|
switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
|
|
|
|
/* Mach-O symbols are passed around in code through indirect references and
|
|
the original symbol_ref hasn't passed through the generic handling and
|
|
reference-catching in output_operand, so we need to manually mark weak
|
|
references as such. */
|
|
|
|
if (SYMBOL_REF_WEAK (symbol))
|
|
{
|
|
tree decl = SYMBOL_REF_DECL (symbol);
|
|
gcc_checking_assert (DECL_P (decl));
|
|
|
|
if (decl != NULL_TREE
|
|
&& DECL_EXTERNAL (decl) && TREE_PUBLIC (decl)
|
|
/* Handle only actual external-only definitions, not
|
|
e.g. extern inline code or variables for which
|
|
storage has been allocated. */
|
|
&& !TREE_STATIC (decl))
|
|
{
|
|
fputs ("\t.weak_reference ", asm_out_file);
|
|
assemble_name (asm_out_file, sym_name);
|
|
fputc ('\n', asm_out_file);
|
|
}
|
|
}
|
|
|
|
assemble_name (asm_out_file, ptr_name);
|
|
fprintf (asm_out_file, ":\n");
|
|
|
|
fprintf (asm_out_file, "\t.indirect_symbol ");
|
|
assemble_name (asm_out_file, sym_name);
|
|
fprintf (asm_out_file, "\n");
|
|
|
|
/* Variables that are marked with MACHO_SYMBOL_FLAG_STATIC need to
|
|
have their symbol name instead of 0 in the second entry of
|
|
the non-lazy symbol pointer data structure when they are
|
|
defined. This allows the runtime to rebind newer instances
|
|
of the translation unit with the original instance of the
|
|
symbol. */
|
|
|
|
rtx init = const0_rtx;
|
|
if (MACHO_SYMBOL_STATIC_P (symbol) && machopic_symbol_defined_p (symbol))
|
|
init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
|
|
|
|
assemble_integer (init, GET_MODE_SIZE (Pmode),
|
|
GET_MODE_ALIGNMENT (Pmode), 1);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
machopic_finish (FILE *asm_out_file)
|
|
{
|
|
if (!machopic_indirections)
|
|
return;
|
|
|
|
/* First output an symbol indirections that have been placed into .data
|
|
(we don't expect these now). */
|
|
machopic_indirections->traverse_noresize
|
|
<FILE *, machopic_output_data_section_indirection> (asm_out_file);
|
|
|
|
machopic_indirections->traverse_noresize
|
|
<FILE *, machopic_output_stub_indirection> (asm_out_file);
|
|
|
|
machopic_indirections->traverse_noresize
|
|
<FILE *, machopic_output_indirection> (asm_out_file);
|
|
}
|
|
|
|
int
|
|
machopic_operand_p (rtx op)
|
|
{
|
|
if (MACHOPIC_JUST_INDIRECT)
|
|
return (GET_CODE (op) == SYMBOL_REF
|
|
&& machopic_symbol_defined_p (op));
|
|
else
|
|
return (GET_CODE (op) == CONST
|
|
&& GET_CODE (XEXP (op, 0)) == UNSPEC
|
|
&& XINT (XEXP (op, 0), 1) == UNSPEC_MACHOPIC_OFFSET);
|
|
}
|
|
|
|
/* This function:
|
|
computes and caches a series of flags that characterise the symbol's
|
|
properties that affect Mach-O code gen (including accidental cases
|
|
from older toolchains).
|
|
|
|
TODO:
|
|
Here we also need to do enough analysis to determine if a symbol's
|
|
name needs to be made linker-visible. This is more tricky - since
|
|
it depends on whether we've previously seen a global weak definition
|
|
in the same section.
|
|
*/
|
|
|
|
void
|
|
darwin_encode_section_info (tree decl, rtx rtl, int first)
|
|
{
|
|
/* Careful not to prod global register variables. */
|
|
if (!MEM_P (rtl))
|
|
return;
|
|
|
|
/* Do the standard encoding things first; this sets:
|
|
SYMBOL_FLAG_FUNCTION,
|
|
SYMBOL_FLAG_LOCAL, (binds_local_p)
|
|
TLS_MODEL, SYMBOL_FLAG_SMALL
|
|
SYMBOL_FLAG_EXTERNAL. */
|
|
default_encode_section_info (decl, rtl, first);
|
|
|
|
if (! VAR_OR_FUNCTION_DECL_P (decl))
|
|
return;
|
|
|
|
rtx sym_ref = XEXP (rtl, 0);
|
|
if (VAR_P (decl))
|
|
SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
|
|
|
|
/* Only really common if there's no initialiser. */
|
|
bool really_common_p = (DECL_COMMON (decl)
|
|
&& (DECL_INITIAL (decl) == NULL
|
|
|| (!in_lto_p
|
|
&& DECL_INITIAL (decl) == error_mark_node)));
|
|
|
|
/* For Darwin, if we have specified visibility and it's not the default
|
|
that's counted 'hidden'. */
|
|
if (DECL_VISIBILITY_SPECIFIED (decl)
|
|
&& DECL_VISIBILITY (decl) != VISIBILITY_DEFAULT)
|
|
SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_HIDDEN_VIS;
|
|
|
|
if (!DECL_EXTERNAL (decl)
|
|
&& (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
|
|
&& ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
|
|
&& ((TREE_STATIC (decl)
|
|
&& (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
|
|
|| (!DECL_COMMON (decl) && DECL_INITIAL (decl)
|
|
&& DECL_INITIAL (decl) != error_mark_node)))
|
|
SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
|
|
|
|
if (! TREE_PUBLIC (decl))
|
|
SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_STATIC;
|
|
|
|
/* Short cut check for Darwin 'must indirect' rules. */
|
|
if (really_common_p
|
|
|| (DECL_WEAK (decl) && ! MACHO_SYMBOL_HIDDEN_VIS_P (sym_ref))
|
|
|| lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
|
|
SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_MUST_INDIRECT;
|
|
|
|
#if DARWIN_PPC
|
|
/* Objective C V2 (m64) IVAR offset refs from Apple GCC-4.x have an
|
|
indirection for m64 code on PPC. Historically, these indirections
|
|
also appear in the .data section. */
|
|
tree o2meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
|
|
o2meta = o2meta ? TREE_VALUE (o2meta) : NULL_TREE;
|
|
|
|
if (o2meta && strncmp (IDENTIFIER_POINTER (o2meta), "V2_IVRF",7) == 0)
|
|
SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_MUST_INDIRECT;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
darwin_mark_decl_preserved (const char *name)
|
|
{
|
|
/* Actually we shouldn't mark any local symbol this way, but for now
|
|
this only happens with ObjC meta-data. */
|
|
if (darwin_label_is_anonymous_local_objc_name (name))
|
|
return;
|
|
|
|
fprintf (asm_out_file, "\t.no_dead_strip ");
|
|
assemble_name (asm_out_file, name);
|
|
fputc ('\n', asm_out_file);
|
|
}
|
|
|
|
static section *
|
|
darwin_rodata_section (int use_coal, bool zsize, int reloc)
|
|
{
|
|
return (use_coal
|
|
? darwin_sections[const_coal_section]
|
|
: (zsize ? darwin_sections[zobj_const_section]
|
|
: reloc ? darwin_sections[const_data_section]
|
|
: darwin_sections[const_section]));
|
|
}
|
|
|
|
static section *
|
|
darwin_mergeable_string_section (tree exp,
|
|
unsigned HOST_WIDE_INT align)
|
|
{
|
|
/* Darwin's ld expects to see non-writable string literals in the .cstring
|
|
section. Later versions of ld check and complain when CFStrings are
|
|
enabled. Therefore we shall force the strings into .cstring since we
|
|
don't support writable ones anyway. */
|
|
if ((darwin_constant_cfstrings || flag_merge_constants)
|
|
&& TREE_CODE (exp) == STRING_CST
|
|
&& TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
|
|
&& align <= 256
|
|
&& (int_size_in_bytes (TREE_TYPE (exp))
|
|
== TREE_STRING_LENGTH (exp))
|
|
&& ((size_t) TREE_STRING_LENGTH (exp)
|
|
== strlen (TREE_STRING_POINTER (exp)) + 1))
|
|
return darwin_sections[cstring_section];
|
|
|
|
if (DARWIN_SECTION_ANCHORS && flag_section_anchors
|
|
&& TREE_CODE (exp) == STRING_CST
|
|
&& TREE_STRING_LENGTH (exp) == 0)
|
|
return darwin_sections[zobj_const_section];
|
|
|
|
return readonly_data_section;
|
|
}
|
|
|
|
#ifndef HAVE_GAS_LITERAL16
|
|
#define HAVE_GAS_LITERAL16 0
|
|
#endif
|
|
|
|
static section *
|
|
darwin_mergeable_constant_section (tree exp,
|
|
unsigned HOST_WIDE_INT align,
|
|
bool zsize)
|
|
{
|
|
if (zsize)
|
|
return darwin_sections[zobj_const_section];
|
|
|
|
machine_mode mode = DECL_MODE (exp);
|
|
if (!flag_merge_constants
|
|
|| mode == VOIDmode
|
|
|| mode == BLKmode
|
|
|| align < 8
|
|
|| align > 256
|
|
|| (align & (align -1)) != 0)
|
|
return readonly_data_section;
|
|
|
|
/* This will ICE if the mode is not a constant size, but that is reasonable,
|
|
since one cannot put a variable-sized thing into a constant section, we
|
|
shouldn't be trying. */
|
|
const unsigned int modesize = GET_MODE_BITSIZE (mode).to_constant ();
|
|
|
|
if (modesize > align)
|
|
return readonly_data_section;
|
|
|
|
tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
|
|
|
|
if (TREE_CODE (size) != INTEGER_CST)
|
|
return readonly_data_section;
|
|
|
|
unsigned isize = TREE_INT_CST_LOW (size);
|
|
if (isize == 4)
|
|
return darwin_sections[literal4_section];
|
|
else if (isize == 8)
|
|
return darwin_sections[literal8_section];
|
|
else if (HAVE_GAS_LITERAL16
|
|
&& TARGET_64BIT
|
|
&& isize == 16)
|
|
return darwin_sections[literal16_section];
|
|
|
|
return readonly_data_section;
|
|
}
|
|
|
|
section *
|
|
darwin_tm_clone_table_section (void)
|
|
{
|
|
return get_named_section (NULL,
|
|
"__DATA,__tm_clone_table,regular,no_dead_strip",
|
|
3);
|
|
}
|
|
|
|
int
|
|
machopic_reloc_rw_mask (void)
|
|
{
|
|
return MACHOPIC_INDIRECT ? 3 : 0;
|
|
}
|
|
|
|
/* We have to deal with ObjC/C++ metadata section placement in the common
|
|
code, since it will also be called from LTO.
|
|
|
|
Return metadata attributes, if present (searching for ABI=2 first)
|
|
Return NULL_TREE if no such attributes are found. */
|
|
|
|
static tree
|
|
is_objc_metadata (tree decl)
|
|
{
|
|
if (DECL_P (decl)
|
|
&& (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
|
|
&& DECL_ATTRIBUTES (decl))
|
|
{
|
|
tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
|
|
if (meta)
|
|
return meta;
|
|
meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
|
|
if (meta)
|
|
return meta;
|
|
}
|
|
return NULL_TREE;
|
|
}
|
|
|
|
static int classes_seen;
|
|
static int objc_metadata_seen;
|
|
|
|
/* Return the section required for Objective C ABI 2 metadata. */
|
|
static section *
|
|
darwin_objc2_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
|
|
{
|
|
const char *p;
|
|
tree ident = TREE_VALUE (meta);
|
|
gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
|
|
p = IDENTIFIER_POINTER (ident);
|
|
|
|
gcc_checking_assert (flag_next_runtime >= 1 && flag_objc_abi == 2);
|
|
|
|
objc_metadata_seen = 1;
|
|
|
|
if (base == data_section)
|
|
base = darwin_sections[objc2_metadata_section];
|
|
|
|
/* Most of the OBJC2 META-data end up in the base section, so check it
|
|
first. */
|
|
if (!strncmp (p, "V2_BASE", 7))
|
|
return base;
|
|
else if (!strncmp (p, "V2_CNAM", 7))
|
|
return darwin_sections[objc2_class_names_section];
|
|
else if (!strncmp (p, "V2_MNAM", 7))
|
|
return darwin_sections[objc2_method_names_section];
|
|
else if (!strncmp (p, "V2_MTYP", 7))
|
|
return darwin_sections[objc2_method_types_section];
|
|
else if (!strncmp (p, "V2_STRG", 7))
|
|
return darwin_sections[cstring_section];
|
|
|
|
else if (!strncmp (p, "G2_META", 7) || !strncmp (p, "G2_CLAS", 7))
|
|
return darwin_sections[objc2_classdefs_section];
|
|
else if (!strncmp (p, "V2_PCOL", 7))
|
|
return ld_uses_coal_sects ? darwin_sections[data_coal_section]
|
|
: darwin_sections[objc2_data_section];
|
|
else if (!strncmp (p, "V2_MREF", 7))
|
|
return darwin_sections[objc2_message_refs_section];
|
|
else if (!strncmp (p, "V2_CLRF", 7))
|
|
return darwin_sections[objc2_classrefs_section];
|
|
else if (!strncmp (p, "V2_SURF", 7))
|
|
return darwin_sections[objc2_super_classrefs_section];
|
|
else if (!strncmp (p, "V2_NLCL", 7))
|
|
return darwin_sections[objc2_nonlazy_class_section];
|
|
else if (!strncmp (p, "V2_CLAB", 7))
|
|
{
|
|
classes_seen = 1;
|
|
return darwin_sections[objc2_classlist_section];
|
|
}
|
|
else if (!strncmp (p, "V2_SRFS", 7))
|
|
return darwin_sections[objc2_selector_refs_section];
|
|
else if (!strncmp (p, "V2_NLCA", 7))
|
|
return darwin_sections[objc2_nonlazy_category_section];
|
|
else if (!strncmp (p, "V2_CALA", 7))
|
|
return darwin_sections[objc2_categorylist_section];
|
|
|
|
else if (!strncmp (p, "V2_PLST", 7))
|
|
return darwin_sections[objc2_protocollist_section];
|
|
else if (!strncmp (p, "V2_PRFS", 7))
|
|
return darwin_sections[objc2_protocolrefs_section];
|
|
|
|
else if (!strncmp (p, "V2_INFO", 7))
|
|
return darwin_sections[objc2_image_info_section];
|
|
|
|
else if (!strncmp (p, "V2_EHTY", 7))
|
|
return ld_uses_coal_sects ? darwin_sections[data_coal_section]
|
|
: data_section;
|
|
|
|
else if (!strncmp (p, "V2_CSTR", 7))
|
|
return darwin_sections[objc2_constant_string_object_section];
|
|
|
|
else if (!strncmp (p, "V2_IVRF", 7))
|
|
return darwin_sections[objc2_ivar_section];
|
|
|
|
/* Not recognized, default. */
|
|
return base;
|
|
}
|
|
|
|
/* Return the section required for Objective C ABI 0/1 metadata. */
|
|
static section *
|
|
darwin_objc1_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
|
|
{
|
|
const char *p;
|
|
tree ident = TREE_VALUE (meta);
|
|
gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
|
|
p = IDENTIFIER_POINTER (ident);
|
|
|
|
gcc_checking_assert (flag_next_runtime >= 1 && flag_objc_abi < 2);
|
|
|
|
objc_metadata_seen = 1;
|
|
|
|
/* String sections first, cos there are lots of strings. */
|
|
if (!strncmp (p, "V1_STRG", 7))
|
|
return darwin_sections[cstring_section];
|
|
else if (!strncmp (p, "V1_CLSN", 7))
|
|
return darwin_sections[objc_class_names_section];
|
|
else if (!strncmp (p, "V1_METN", 7))
|
|
return darwin_sections[objc_meth_var_names_section];
|
|
else if (!strncmp (p, "V1_METT", 7))
|
|
return darwin_sections[objc_meth_var_types_section];
|
|
|
|
else if (!strncmp (p, "V1_CLAS", 7))
|
|
{
|
|
classes_seen = 1;
|
|
return darwin_sections[objc_class_section];
|
|
}
|
|
else if (!strncmp (p, "V1_META", 7))
|
|
return darwin_sections[objc_meta_class_section];
|
|
else if (!strncmp (p, "V1_CATG", 7))
|
|
return darwin_sections[objc_category_section];
|
|
else if (!strncmp (p, "V1_PROT", 7))
|
|
return darwin_sections[objc_protocol_section];
|
|
|
|
else if (!strncmp (p, "V1_CLCV", 7))
|
|
return darwin_sections[objc_class_vars_section];
|
|
else if (!strncmp (p, "V1_CLIV", 7))
|
|
return darwin_sections[objc_instance_vars_section];
|
|
|
|
else if (!strncmp (p, "V1_CLCM", 7))
|
|
return darwin_sections[objc_cls_meth_section];
|
|
else if (!strncmp (p, "V1_CLIM", 7))
|
|
return darwin_sections[objc_inst_meth_section];
|
|
else if (!strncmp (p, "V1_CACM", 7))
|
|
return darwin_sections[objc_cat_cls_meth_section];
|
|
else if (!strncmp (p, "V1_CAIM", 7))
|
|
return darwin_sections[objc_cat_inst_meth_section];
|
|
else if (!strncmp (p, "V1_PNSM", 7))
|
|
return darwin_sections[objc_cat_inst_meth_section];
|
|
else if (!strncmp (p, "V1_PCLM", 7))
|
|
return darwin_sections[objc_cat_cls_meth_section];
|
|
|
|
else if (!strncmp (p, "V1_CLPR", 7))
|
|
return darwin_sections[objc_cat_cls_meth_section];
|
|
else if (!strncmp (p, "V1_CAPR", 7))
|
|
return darwin_sections[objc_category_section]; /* ??? CHECK me. */
|
|
|
|
else if (!strncmp (p, "V1_PRFS", 7))
|
|
return darwin_sections[objc_cat_cls_meth_section];
|
|
else if (!strncmp (p, "V1_CLRF", 7))
|
|
return darwin_sections[objc_cls_refs_section];
|
|
else if (!strncmp (p, "V1_SRFS", 7))
|
|
return darwin_sections[objc_selector_refs_section];
|
|
|
|
else if (!strncmp (p, "V1_MODU", 7))
|
|
return darwin_sections[objc_module_info_section];
|
|
else if (!strncmp (p, "V1_SYMT", 7))
|
|
return darwin_sections[objc_symbols_section];
|
|
else if (!strncmp (p, "V1_INFO", 7))
|
|
return darwin_sections[objc_image_info_section];
|
|
|
|
else if (!strncmp (p, "V1_PLST", 7))
|
|
return darwin_sections[objc1_prop_list_section];
|
|
else if (!strncmp (p, "V1_PEXT", 7))
|
|
return darwin_sections[objc1_protocol_ext_section];
|
|
else if (!strncmp (p, "V1_CEXT", 7))
|
|
return darwin_sections[objc1_class_ext_section];
|
|
|
|
else if (!strncmp (p, "V2_CSTR", 7))
|
|
return darwin_sections[objc_constant_string_object_section];
|
|
|
|
return base;
|
|
}
|
|
|
|
section *
|
|
machopic_select_section (tree decl,
|
|
int reloc,
|
|
unsigned HOST_WIDE_INT align)
|
|
{
|
|
bool zsize, one, weak, use_coal, ro;
|
|
section *base_section = NULL;
|
|
|
|
weak = (DECL_P (decl)
|
|
&& DECL_WEAK (decl)
|
|
&& !lookup_attribute ("weak_import", DECL_ATTRIBUTES (decl)));
|
|
|
|
/* Darwin pads zero-sized objects with at least one byte, so that the ld64
|
|
atom model is preserved (objects must have distinct regions starting with
|
|
a unique linker-visible symbol).
|
|
In order to support section anchors, we need to move objects with zero
|
|
size into sections which are marked as "no section anchors"; the padded
|
|
objects, obviously, have real sizes that differ from their DECL sizes. */
|
|
zsize = DARWIN_SECTION_ANCHORS && flag_section_anchors;
|
|
|
|
/* In the streaming of LTO symbol data, we might have a situation where the
|
|
var is incomplete or layout not finished (DECL_SIZE_UNIT is NULL_TREE).
|
|
We cannot tell if it is zero-sized then, but we can get the section
|
|
category correct so that nm reports the right kind of section
|
|
(e.g. BSS c.f. data). */
|
|
zsize = (zsize
|
|
&& DECL_P (decl)
|
|
&& (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
|
|
&& DECL_SIZE_UNIT (decl)
|
|
&& tree_to_uhwi (DECL_SIZE_UNIT (decl)) == 0);
|
|
|
|
one = DECL_P (decl)
|
|
&& TREE_CODE (decl) == VAR_DECL
|
|
&& DECL_COMDAT_GROUP (decl);
|
|
|
|
use_coal = (weak || one) && ld_uses_coal_sects;
|
|
|
|
ro = TREE_READONLY (decl) || TREE_CONSTANT (decl) ;
|
|
|
|
switch (categorize_decl_for_section (decl, reloc))
|
|
{
|
|
case SECCAT_TEXT:
|
|
gcc_unreachable ();
|
|
break;
|
|
|
|
case SECCAT_RODATA:
|
|
case SECCAT_SRODATA:
|
|
base_section = darwin_rodata_section (use_coal, zsize, reloc);
|
|
break;
|
|
|
|
case SECCAT_RODATA_MERGE_STR:
|
|
base_section = darwin_mergeable_string_section (decl, align);
|
|
break;
|
|
|
|
case SECCAT_RODATA_MERGE_STR_INIT:
|
|
base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align);
|
|
break;
|
|
|
|
case SECCAT_RODATA_MERGE_CONST:
|
|
base_section = darwin_mergeable_constant_section (decl, align, zsize);
|
|
break;
|
|
|
|
case SECCAT_DATA:
|
|
case SECCAT_DATA_REL:
|
|
case SECCAT_DATA_REL_LOCAL:
|
|
case SECCAT_DATA_REL_RO:
|
|
case SECCAT_DATA_REL_RO_LOCAL:
|
|
case SECCAT_SDATA:
|
|
case SECCAT_TDATA:
|
|
if (use_coal)
|
|
{
|
|
if (ro)
|
|
base_section = darwin_sections[const_data_coal_section];
|
|
else
|
|
base_section = darwin_sections[data_coal_section];
|
|
}
|
|
else if (zsize)
|
|
{
|
|
/* If we're doing section anchors, then punt zero-sized objects into
|
|
their own sections so that they don't interfere with offset
|
|
computation for the remaining vars. */
|
|
if (ro)
|
|
base_section = darwin_sections[zobj_const_data_section];
|
|
else
|
|
base_section = darwin_sections[zobj_data_section];
|
|
}
|
|
else if (ro)
|
|
base_section = darwin_sections[const_data_section];
|
|
else
|
|
base_section = data_section;
|
|
break;
|
|
case SECCAT_BSS:
|
|
case SECCAT_SBSS:
|
|
case SECCAT_TBSS:
|
|
if (use_coal)
|
|
base_section = darwin_sections[data_coal_section];
|
|
else
|
|
{
|
|
if (!TREE_PUBLIC (decl))
|
|
base_section = lcomm_section;
|
|
else if (bss_noswitch_section)
|
|
base_section = bss_noswitch_section;
|
|
else
|
|
base_section = data_section;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
gcc_unreachable ();
|
|
}
|
|
|
|
/* Darwin weird special cases.
|
|
a) OBJC Meta-data. */
|
|
if (DECL_P (decl)
|
|
&& (TREE_CODE (decl) == VAR_DECL
|
|
|| TREE_CODE (decl) == CONST_DECL)
|
|
&& DECL_ATTRIBUTES (decl))
|
|
{
|
|
tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
|
|
if (meta)
|
|
return darwin_objc2_section (decl, meta, base_section);
|
|
meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
|
|
if (meta)
|
|
return darwin_objc1_section (decl, meta, base_section);
|
|
meta = lookup_attribute ("OBJC1METG", DECL_ATTRIBUTES (decl));
|
|
if (meta)
|
|
return base_section; /* GNU runtime is happy with it all in one pot. */
|
|
}
|
|
|
|
/* b) Constant string objects. */
|
|
if (TREE_CODE (decl) == CONSTRUCTOR
|
|
&& TREE_TYPE (decl)
|
|
&& TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
|
|
&& TYPE_NAME (TREE_TYPE (decl)))
|
|
{
|
|
tree name = TYPE_NAME (TREE_TYPE (decl));
|
|
if (TREE_CODE (name) == TYPE_DECL)
|
|
name = DECL_NAME (name);
|
|
|
|
if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
|
|
{
|
|
if (flag_next_runtime)
|
|
{
|
|
if (flag_objc_abi == 2)
|
|
return darwin_sections[objc2_constant_string_object_section];
|
|
else
|
|
return darwin_sections[objc_constant_string_object_section];
|
|
}
|
|
else
|
|
return darwin_sections[objc_string_object_section];
|
|
}
|
|
else if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_CFString"))
|
|
return darwin_sections[cfstring_constant_object_section];
|
|
else
|
|
return base_section;
|
|
}
|
|
else if (flag_next_runtime
|
|
&& VAR_P (decl)
|
|
&& DECL_NAME (decl)
|
|
&& TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
|
|
&& IDENTIFIER_POINTER (DECL_NAME (decl))
|
|
&& !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
|
|
/* c) legacy meta-data selection was deprecated at 4.6, removed now. */
|
|
gcc_unreachable ();
|
|
|
|
return base_section;
|
|
}
|
|
|
|
/* This can be called with address expressions as "rtx".
|
|
They must go in "const". */
|
|
|
|
section *
|
|
machopic_select_rtx_section (machine_mode mode, rtx x,
|
|
unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
|
|
{
|
|
if (known_eq (GET_MODE_SIZE (mode), 8)
|
|
&& (GET_CODE (x) == CONST_INT
|
|
|| GET_CODE (x) == CONST_WIDE_INT
|
|
|| GET_CODE (x) == CONST_DOUBLE))
|
|
return darwin_sections[literal8_section];
|
|
else if (known_eq (GET_MODE_SIZE (mode), 4)
|
|
&& (GET_CODE (x) == CONST_INT
|
|
|| GET_CODE (x) == CONST_WIDE_INT
|
|
|| GET_CODE (x) == CONST_DOUBLE))
|
|
return darwin_sections[literal4_section];
|
|
else if (HAVE_GAS_LITERAL16
|
|
&& TARGET_64BIT
|
|
&& known_eq (GET_MODE_SIZE (mode), 16)
|
|
&& (GET_CODE (x) == CONST_INT
|
|
|| GET_CODE (x) == CONST_WIDE_INT
|
|
|| GET_CODE (x) == CONST_DOUBLE
|
|
|| GET_CODE (x) == CONST_VECTOR))
|
|
return darwin_sections[literal16_section];
|
|
else if (MACHOPIC_INDIRECT
|
|
&& (GET_CODE (x) == SYMBOL_REF
|
|
|| GET_CODE (x) == CONST
|
|
|| GET_CODE (x) == LABEL_REF))
|
|
return darwin_sections[const_data_section];
|
|
else
|
|
return darwin_sections[const_section];
|
|
}
|
|
|
|
void
|
|
machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
|
|
{
|
|
cdtor_record new_elt = {symbol, priority, vec_safe_length (ctors)};
|
|
|
|
vec_safe_push (ctors, new_elt);
|
|
|
|
if (! MACHOPIC_INDIRECT)
|
|
fprintf (asm_out_file, ".reference .constructors_used\n");
|
|
}
|
|
|
|
void
|
|
machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
|
|
{
|
|
cdtor_record new_elt = {symbol, priority, vec_safe_length (dtors)};
|
|
|
|
vec_safe_push (dtors, new_elt);
|
|
|
|
if (! MACHOPIC_INDIRECT)
|
|
fprintf (asm_out_file, ".reference .destructors_used\n");
|
|
}
|
|
|
|
static int
|
|
sort_cdtor_records (const void * a, const void * b)
|
|
{
|
|
const cdtor_record *cda = (const cdtor_record *)a;
|
|
const cdtor_record *cdb = (const cdtor_record *)b;
|
|
if (cda->priority > cdb->priority)
|
|
return 1;
|
|
if (cda->priority < cdb->priority)
|
|
return -1;
|
|
if (cda->position > cdb->position)
|
|
return 1;
|
|
if (cda->position < cdb->position)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
finalize_ctors ()
|
|
{
|
|
unsigned int i;
|
|
cdtor_record *elt;
|
|
|
|
if (MACHOPIC_INDIRECT)
|
|
switch_to_section (darwin_sections[mod_init_section]);
|
|
else
|
|
switch_to_section (darwin_sections[constructor_section]);
|
|
|
|
/* Where needed, provide a linker-visible section-start symbol so that we
|
|
have stable output between debug and non-debug. */
|
|
if (ld_init_term_start_labels)
|
|
fputs (MACHOPIC_INDIRECT ? "_Mod.init:\n" : "_CTOR.sect:\n", asm_out_file);
|
|
|
|
if (vec_safe_length (ctors) > 1)
|
|
ctors->qsort (sort_cdtor_records);
|
|
FOR_EACH_VEC_SAFE_ELT (ctors, i, elt)
|
|
{
|
|
assemble_align (POINTER_SIZE);
|
|
assemble_integer (elt->symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
|
|
}
|
|
}
|
|
|
|
static void
|
|
finalize_dtors ()
|
|
{
|
|
unsigned int i;
|
|
cdtor_record *elt;
|
|
|
|
if (MACHOPIC_INDIRECT)
|
|
switch_to_section (darwin_sections[mod_term_section]);
|
|
else
|
|
switch_to_section (darwin_sections[destructor_section]);
|
|
|
|
/* Where needed, provide a linker-visible section-start symbol so that we
|
|
have stable output between debug and non-debug. */
|
|
if (ld_init_term_start_labels)
|
|
fputs (MACHOPIC_INDIRECT ? "_Mod.term:\n" : "_DTOR.sect:\n", asm_out_file);
|
|
|
|
if (vec_safe_length (dtors) > 1)
|
|
dtors->qsort (sort_cdtor_records);
|
|
FOR_EACH_VEC_SAFE_ELT (dtors, i, elt)
|
|
{
|
|
assemble_align (POINTER_SIZE);
|
|
assemble_integer (elt->symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
|
|
}
|
|
}
|
|
|
|
void
|
|
darwin_globalize_label (FILE *stream, const char *name)
|
|
{
|
|
if (!!strncmp (name, "_OBJC_", 6))
|
|
default_globalize_label (stream, name);
|
|
/* We have some Objective C cases that need to be global, but only on newer
|
|
OS versions. */
|
|
if (flag_objc_abi < 2 || flag_next_runtime < 100700)
|
|
return;
|
|
if (!strncmp (name+6, "LabelPro", 8))
|
|
default_globalize_label (stream, name);
|
|
if (!strncmp (name+6, "Protocol_", 9))
|
|
default_globalize_label (stream, name);
|
|
}
|
|
|
|
/* This routine returns non-zero if 'name' starts with the special objective-c
|
|
anonymous file-scope static name. It accommodates c++'s mangling of such
|
|
symbols (in this case the symbols will have form _ZL{d}*_OBJC_* d=digit). */
|
|
|
|
int
|
|
darwin_label_is_anonymous_local_objc_name (const char *name)
|
|
{
|
|
const unsigned char *p = (const unsigned char *) name;
|
|
if (*p != '_')
|
|
return 0;
|
|
if (p[1] == 'Z' && p[2] == 'L')
|
|
{
|
|
p += 3;
|
|
while (*p >= '0' && *p <= '9')
|
|
p++;
|
|
}
|
|
if (strncmp ((const char *)p, "_OBJC_", 6) != 0)
|
|
return false;
|
|
|
|
/* We need some of the objective c meta-data symbols to be visible to the
|
|
linker (when the target OS version is newer). FIXME: this is horrible,
|
|
we need a better mechanism. */
|
|
|
|
if (flag_objc_abi < 2 || flag_next_runtime < 100700)
|
|
return true;
|
|
|
|
p += 6;
|
|
if (!strncmp ((const char *)p, "ClassRef", 8))
|
|
return false;
|
|
else if (!strncmp ((const char *)p, "SelRef", 6))
|
|
return false;
|
|
else if (!strncmp ((const char *)p, "Category", 8))
|
|
{
|
|
if (p[8] == '_' || p[8] == 'I' || p[8] == 'P' || p[8] == 'C' )
|
|
return false;
|
|
return true;
|
|
}
|
|
else if (!strncmp ((const char *)p, "ClassMethods", 12))
|
|
return false;
|
|
else if (!strncmp ((const char *)p, "Instance", 8))
|
|
{
|
|
if (p[8] == 'I' || p[8] == 'M')
|
|
return false;
|
|
return true;
|
|
}
|
|
else if (!strncmp ((const char *)p, "CLASS_RO", 8))
|
|
return false;
|
|
else if (!strncmp ((const char *)p, "METACLASS_RO", 12))
|
|
return false;
|
|
else if (!strncmp ((const char *)p, "Protocol", 8))
|
|
{
|
|
if (p[8] == '_' || p[8] == 'I' || p[8] == 'P'
|
|
|| p[8] == 'M' || p[8] == 'C' || p[8] == 'O')
|
|
return false;
|
|
return true;
|
|
}
|
|
else if (!strncmp ((const char *)p, "LabelPro", 8))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/* LTO support for Mach-O.
|
|
|
|
This version uses three mach-o sections to encapsulate the (unlimited
|
|
number of) lto sections.
|
|
|
|
__GNU_LTO, __lto_sections contains the concatented GNU LTO section data.
|
|
__GNU_LTO, __section_names contains the GNU LTO section names.
|
|
__GNU_LTO, __section_index contains an array of values that index these.
|
|
|
|
Indexed thus:
|
|
<section offset from the start of __GNU_LTO, __lto_sections>,
|
|
<section length>
|
|
<name offset from the start of __GNU_LTO, __section_names,
|
|
<name length>.
|
|
|
|
At present, for both m32 and m64 mach-o files each of these fields is
|
|
represented by a uint32_t. This is because, AFAICT, a mach-o object
|
|
cannot exceed 4Gb because the section_64 offset field (see below) is 32bits.
|
|
|
|
uint32_t offset;
|
|
"offset An integer specifying the offset to this section in the file." */
|
|
|
|
/* Count lto section numbers. */
|
|
static unsigned int lto_section_num = 0;
|
|
|
|
/* A vector of information about LTO sections, at present, we only have
|
|
the name. TODO: see if we can get the data length somehow. */
|
|
typedef struct GTY (()) darwin_lto_section_e {
|
|
const char *sectname;
|
|
} darwin_lto_section_e ;
|
|
|
|
static GTY (()) vec<darwin_lto_section_e, va_gc> *lto_section_names;
|
|
|
|
/* Section wrapper scheme (used here to wrap the unlimited number of LTO
|
|
sections into three Mach-O ones).
|
|
NOTE: These names MUST be kept in sync with those in
|
|
libiberty/simple-object-mach-o. */
|
|
#define LTO_SECTS_SECTION "__wrapper_sects"
|
|
#define LTO_NAMES_SECTION "__wrapper_names"
|
|
#define LTO_INDEX_SECTION "__wrapper_index"
|
|
|
|
/* File to temporarily store LTO data. This is appended to asm_out_file
|
|
in darwin_end_file. */
|
|
static FILE *lto_asm_out_file, *saved_asm_out_file;
|
|
static char *lto_asm_out_name;
|
|
static enum debug_info_levels saved_debug_info_level;
|
|
|
|
/* Prepare asm_out_file for LTO output. For darwin, this means hiding
|
|
asm_out_file and switching to an alternative output file. */
|
|
void
|
|
darwin_asm_lto_start (void)
|
|
{
|
|
gcc_assert (! saved_asm_out_file);
|
|
saved_asm_out_file = asm_out_file;
|
|
saved_debug_info_level = debug_info_level;
|
|
debug_info_level = DINFO_LEVEL_NONE;
|
|
if (! lto_asm_out_name)
|
|
lto_asm_out_name = make_temp_file (".lto.s");
|
|
lto_asm_out_file = fopen (lto_asm_out_name, "a");
|
|
if (lto_asm_out_file == NULL)
|
|
fatal_error (input_location,
|
|
"failed to open temporary file %s for LTO output",
|
|
lto_asm_out_name);
|
|
asm_out_file = lto_asm_out_file;
|
|
}
|
|
|
|
/* Restore asm_out_file. */
|
|
void
|
|
darwin_asm_lto_end (void)
|
|
{
|
|
gcc_assert (saved_asm_out_file);
|
|
fclose (lto_asm_out_file);
|
|
asm_out_file = saved_asm_out_file;
|
|
saved_asm_out_file = NULL;
|
|
debug_info_level = saved_debug_info_level;
|
|
}
|
|
|
|
static void
|
|
darwin_asm_dwarf_section (const char *name, unsigned int flags,
|
|
tree decl, bool is_for_lto);
|
|
|
|
/* Called for the TARGET_ASM_NAMED_SECTION hook. */
|
|
|
|
void
|
|
darwin_asm_named_section (const char *name,
|
|
unsigned int flags,
|
|
tree decl ATTRIBUTE_UNUSED)
|
|
{
|
|
/* LTO sections go in a special section that encapsulates the (unlimited)
|
|
number of GNU LTO sections within a single mach-o one. */
|
|
if (strncmp (name, LTO_SECTION_NAME_PREFIX,
|
|
strlen (LTO_SECTION_NAME_PREFIX)) == 0)
|
|
{
|
|
darwin_lto_section_e e;
|
|
/* We expect certain flags to be set... */
|
|
gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
|
|
== (SECTION_DEBUG | SECTION_NAMED));
|
|
|
|
/* Switch to our combined section. */
|
|
fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
|
|
LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
|
|
/* Output a label for the start of this sub-section. */
|
|
fprintf (asm_out_file, "L_GNU_LTO%d:\t;# %s\n",
|
|
lto_section_num, name);
|
|
/* We have to jump through hoops to get the values of the intra-section
|
|
offsets... */
|
|
fprintf (asm_out_file, "\t.set L$gnu$lto$offs%d,L_GNU_LTO%d-L_GNU_LTO0\n",
|
|
lto_section_num, lto_section_num);
|
|
fprintf (asm_out_file,
|
|
"\t.set L$gnu$lto$size%d,L_GNU_LTO%d-L_GNU_LTO%d\n",
|
|
lto_section_num, lto_section_num+1, lto_section_num);
|
|
lto_section_num++;
|
|
e.sectname = xstrdup (name);
|
|
/* Keep the names, we'll need to make a table later.
|
|
TODO: check that we do not revisit sections, that would break
|
|
the assumption of how this is done. */
|
|
if (lto_section_names == NULL)
|
|
vec_alloc (lto_section_names, 16);
|
|
vec_safe_push (lto_section_names, e);
|
|
}
|
|
else if (strncmp (name, "__DWARF,", 8) == 0)
|
|
darwin_asm_dwarf_section (name, flags, decl, false);
|
|
else if (strncmp (name, "__GNU_DWARF_LTO,", 16) == 0)
|
|
darwin_asm_dwarf_section (name, flags, decl, true);
|
|
else
|
|
fprintf (asm_out_file, "\t.section %s\n", name);
|
|
}
|
|
|
|
void
|
|
darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
|
|
{
|
|
/* Darwin does not use unique sections. */
|
|
}
|
|
|
|
/* Handle __attribute__ ((apple_kext_compatibility)).
|
|
This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
|
|
vtable for classes with this attribute (and their descendants) by not
|
|
outputting the new 3.0 nondeleting destructor. This means that such
|
|
objects CANNOT be allocated on the stack or as globals UNLESS they have
|
|
a completely empty `operator delete'.
|
|
Luckily, this fits in with the Darwin kext model.
|
|
|
|
This attribute also disables gcc3's potential overlaying of derived
|
|
class data members on the padding at the end of the base class. */
|
|
|
|
tree
|
|
darwin_handle_kext_attribute (tree *node, tree name,
|
|
tree args ATTRIBUTE_UNUSED,
|
|
int flags ATTRIBUTE_UNUSED,
|
|
bool *no_add_attrs)
|
|
{
|
|
/* APPLE KEXT stuff -- only applies with pure static C++ code. */
|
|
if (! TARGET_KEXTABI)
|
|
{
|
|
warning (0, "%qE 2.95 vtable-compatibility attribute applies "
|
|
"only when compiling a kext", name);
|
|
|
|
*no_add_attrs = true;
|
|
}
|
|
else if (TREE_CODE (*node) != RECORD_TYPE)
|
|
{
|
|
warning (0, "%qE 2.95 vtable-compatibility attribute applies "
|
|
"only to C++ classes", name);
|
|
|
|
*no_add_attrs = true;
|
|
}
|
|
|
|
return NULL_TREE;
|
|
}
|
|
|
|
/* Handle a "weak_import" attribute; arguments as in
|
|
struct attribute_spec.handler. */
|
|
|
|
tree
|
|
darwin_handle_weak_import_attribute (tree *node, tree name,
|
|
tree ARG_UNUSED (args),
|
|
int ARG_UNUSED (flags),
|
|
bool * no_add_attrs)
|
|
{
|
|
if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
|
|
{
|
|
warning (OPT_Wattributes, "%qE attribute ignored",
|
|
name);
|
|
*no_add_attrs = true;
|
|
}
|
|
else
|
|
declare_weak (*node);
|
|
|
|
return NULL_TREE;
|
|
}
|
|
|
|
/* Emit a label for an FDE, making it global and/or weak if appropriate.
|
|
The third parameter is nonzero if this is for exception handling.
|
|
The fourth parameter is nonzero if this is just a placeholder for an
|
|
FDE that we are omitting. */
|
|
|
|
void
|
|
darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
|
|
{
|
|
char *lab ;
|
|
char buf[32];
|
|
static int invok_count = 0;
|
|
static tree last_fun_decl = NULL_TREE;
|
|
|
|
/* Modern linkers can produce distinct FDEs without compiler support. */
|
|
if (! for_eh || ! ld_needs_eh_markers)
|
|
return;
|
|
|
|
/* FIXME: This only works when the eh for all sections of a function are
|
|
emitted at the same time. If that changes, we would need to use a lookup
|
|
table of some form to determine what to do. Also, we should emit the
|
|
unadorned label for the partition containing the public label for a
|
|
function. This is of limited use, probably, since we do not currently
|
|
enable partitioning. */
|
|
strcpy (buf, ".eh");
|
|
if (decl && TREE_CODE (decl) == FUNCTION_DECL)
|
|
{
|
|
if (decl == last_fun_decl)
|
|
{
|
|
invok_count++;
|
|
snprintf (buf, 31, "$$part$$%d.eh", invok_count);
|
|
}
|
|
else
|
|
{
|
|
last_fun_decl = decl;
|
|
invok_count = 0;
|
|
}
|
|
}
|
|
|
|
lab = concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), buf, NULL);
|
|
|
|
if (TREE_PUBLIC (decl))
|
|
{
|
|
targetm.asm_out.globalize_label (file, lab);
|
|
if (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN)
|
|
{
|
|
fputs ("\t.private_extern ", file);
|
|
assemble_name (file, lab);
|
|
fputc ('\n', file);
|
|
}
|
|
}
|
|
|
|
if (DECL_WEAK (decl))
|
|
{
|
|
fputs ("\t.weak_definition ", file);
|
|
assemble_name (file, lab);
|
|
fputc ('\n', file);
|
|
}
|
|
|
|
assemble_name (file, lab);
|
|
if (empty)
|
|
{
|
|
fputs (" = 0\n", file);
|
|
|
|
/* Mark the absolute .eh and .eh1 style labels as needed to
|
|
ensure that we don't dead code strip them and keep such
|
|
labels from another instantiation point until we can fix this
|
|
properly with group comdat support. */
|
|
darwin_mark_decl_preserved (lab);
|
|
}
|
|
else
|
|
fputs (":\n", file);
|
|
|
|
free (lab);
|
|
}
|
|
|
|
static GTY(()) unsigned long except_table_label_num;
|
|
|
|
void
|
|
darwin_emit_except_table_label (FILE *file)
|
|
{
|
|
char section_start_label[30];
|
|
|
|
ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
|
|
except_table_label_num++);
|
|
ASM_OUTPUT_LABEL (file, section_start_label);
|
|
}
|
|
|
|
rtx
|
|
darwin_make_eh_symbol_indirect (rtx orig, bool ARG_UNUSED (pubvis))
|
|
{
|
|
if (DARWIN_PPC == 0 && TARGET_64BIT)
|
|
return orig;
|
|
|
|
return gen_rtx_SYMBOL_REF (Pmode,
|
|
machopic_indirection_name (orig,
|
|
/*stub_p=*/false));
|
|
}
|
|
|
|
/* The unwinders in earlier Darwin versions are based on an old version
|
|
of libgcc_s and need current frame address stateto be reset after a
|
|
DW_CFA_restore_state recovers the register values. */
|
|
|
|
bool
|
|
darwin_should_restore_cfa_state (void)
|
|
{
|
|
return generating_for_darwin_version <= 10;
|
|
}
|
|
|
|
/* Return, and mark as used, the name of the stub for the mcount function.
|
|
Currently, this is only called by X86 code in the expansion of the
|
|
FUNCTION_PROFILER macro, when stubs are enabled. */
|
|
|
|
const char*
|
|
machopic_mcount_stub_name (void)
|
|
{
|
|
rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
|
|
const char *name = machopic_indirection_name (symbol, /*stub_p=*/true);
|
|
machopic_validate_stub_or_non_lazy_ptr (name);
|
|
return name;
|
|
}
|
|
|
|
/* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
|
|
|
|
void
|
|
darwin_non_lazy_pcrel (FILE *file, rtx addr)
|
|
{
|
|
const char *nlp_name;
|
|
|
|
gcc_assert (GET_CODE (addr) == SYMBOL_REF);
|
|
|
|
nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
|
|
fputs ("\t.long\t", file);
|
|
ASM_OUTPUT_LABELREF (file, nlp_name);
|
|
fputs ("-.", file);
|
|
}
|
|
|
|
/* If this is uncommented, details of each allocation will be printed
|
|
in the asm right before the actual code. WARNING - this will cause some
|
|
test-suite fails (since the printout will contain items that some tests
|
|
are not expecting) -- so don't leave it on by default (it bloats the
|
|
asm too). */
|
|
/*#define DEBUG_DARWIN_MEM_ALLOCATORS*/
|
|
|
|
/* The first two of these routines are ostensibly just intended to put
|
|
names into the asm. However, they are both hijacked in order to ensure
|
|
that zero-sized items do not make their way into the output. Consequently,
|
|
we also need to make these participate in provisions for dealing with
|
|
such items in section anchors. */
|
|
|
|
/* The implementation of ASM_DECLARE_OBJECT_NAME. */
|
|
/* The RTTI data (e.g., __ti4name) is common and public (and static),
|
|
but it does need to be referenced via indirect PIC data pointers.
|
|
The machopic_define_symbol calls are telling the machopic subsystem
|
|
that the name *is* defined in this module, so it doesn't need to
|
|
make them indirect. */
|
|
void
|
|
darwin_asm_declare_object_name (FILE *file,
|
|
const char *nam, tree decl)
|
|
{
|
|
const char *xname = nam;
|
|
unsigned HOST_WIDE_INT size;
|
|
bool local_def, weak;
|
|
|
|
weak = (DECL_P (decl)
|
|
&& DECL_WEAK (decl)
|
|
&& !lookup_attribute ("weak_import",
|
|
DECL_ATTRIBUTES (decl)));
|
|
|
|
local_def = DECL_INITIAL (decl) || (TREE_STATIC (decl)
|
|
&& (!DECL_COMMON (decl)
|
|
|| !TREE_PUBLIC (decl)));
|
|
|
|
if (GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
|
|
xname = IDENTIFIER_POINTER (DECL_NAME (decl));
|
|
|
|
if (local_def)
|
|
{
|
|
(* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
|
|
if (!weak)
|
|
machopic_define_symbol (DECL_RTL (decl));
|
|
}
|
|
|
|
size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
|
|
|
|
#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
|
|
fprintf (file, "# dadon: %s %s (%llu, %u) local %d weak %d"
|
|
" stat %d com %d pub %d t-const %d t-ro %d init %lx\n",
|
|
xname, (TREE_CODE (decl) == VAR_DECL?"var":"const"),
|
|
(unsigned long long)size, DECL_ALIGN (decl), local_def,
|
|
DECL_WEAK (decl), TREE_STATIC (decl), DECL_COMMON (decl),
|
|
TREE_PUBLIC (decl), TREE_CONSTANT (decl), TREE_READONLY (decl),
|
|
(unsigned long)DECL_INITIAL (decl));
|
|
#endif
|
|
|
|
/* Darwin needs help to support local zero-sized objects.
|
|
They must be made at least one byte, and the section containing must be
|
|
marked as unsuitable for section-anchors (see storage allocators below).
|
|
|
|
For non-zero objects this output is handled by varasm.c.
|
|
*/
|
|
if (!size)
|
|
{
|
|
unsigned int l2align = 0;
|
|
|
|
/* The align must be honored, even for zero-sized. */
|
|
if (DECL_ALIGN (decl))
|
|
{
|
|
l2align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
|
|
fprintf (file, "\t.align\t%u\n", l2align);
|
|
}
|
|
|
|
ASM_OUTPUT_LABEL (file, xname);
|
|
size = 1;
|
|
fprintf (file, "\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
|
|
|
|
/* Check that we've correctly picked up the zero-sized item and placed it
|
|
properly. */
|
|
gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
|
|
|| (in_section
|
|
&& (in_section->common.flags & SECTION_NO_ANCHOR)));
|
|
}
|
|
else
|
|
ASM_OUTPUT_LABEL (file, xname);
|
|
}
|
|
|
|
/* The implementation of ASM_DECLARE_CONSTANT_NAME. */
|
|
void
|
|
darwin_asm_declare_constant_name (FILE *file, const char *name,
|
|
const_tree exp ATTRIBUTE_UNUSED,
|
|
HOST_WIDE_INT size)
|
|
{
|
|
assemble_label (file, name);
|
|
/* As for other items, we need at least one byte. */
|
|
if (!size)
|
|
{
|
|
fputs ("\t.space\t1\n", file);
|
|
/* Check that we've correctly picked up the zero-sized item and placed it
|
|
properly. */
|
|
gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
|
|
|| (in_section
|
|
&& (in_section->common.flags & SECTION_NO_ANCHOR)));
|
|
}
|
|
}
|
|
|
|
/* Darwin storage allocators.
|
|
|
|
Zerofill sections are desirable for large blank data since, otherwise, these
|
|
data bloat objects (PR33210).
|
|
|
|
However, section anchors don't work in .zerofill sections (one cannot switch
|
|
to a zerofill section). Ergo, for Darwin targets using section anchors we need
|
|
to put (at least some) data into 'normal' switchable sections.
|
|
|
|
Here we set a relatively arbitrary value for the size of an object to trigger
|
|
zerofill when section anchors are enabled (anything bigger than a page for
|
|
current Darwin implementations). FIXME: there ought to be some objective way
|
|
to make this choice.
|
|
|
|
When section anchor are off this is ignored anyway. */
|
|
|
|
#define BYTES_ZFILL 4096
|
|
|
|
/* Emit a chunk of data for items coalesced by the linker. */
|
|
static void
|
|
darwin_emit_weak_or_comdat (FILE *fp, tree decl, const char *name,
|
|
unsigned HOST_WIDE_INT size,
|
|
bool use_coal,
|
|
unsigned int align)
|
|
{
|
|
/* Since the sections used here are coalesced, they will not be eligible
|
|
for section anchors, and therefore we don't need to break that out.
|
|
CHECKME: for modern linker on PowerPC. */
|
|
if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
|
|
switch_to_section (use_coal ? darwin_sections[const_data_coal_section]
|
|
: darwin_sections[const_data_section]);
|
|
else
|
|
switch_to_section (use_coal ? darwin_sections[data_coal_section]
|
|
: data_section);
|
|
|
|
/* To be consistent, we'll allow darwin_asm_declare_object_name to assemble
|
|
the align info for zero-sized items... but do it here otherwise. */
|
|
if (size && align)
|
|
fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));
|
|
|
|
if (TREE_PUBLIC (decl))
|
|
darwin_globalize_label (fp, name);
|
|
|
|
/* ... and we let it deal with outputting one byte of zero for them too. */
|
|
darwin_asm_declare_object_name (fp, name, decl);
|
|
if (size)
|
|
assemble_zeros (size);
|
|
}
|
|
|
|
/* Emit a chunk of data for ObjC meta-data that got placed in BSS erroneously. */
|
|
static void
|
|
darwin_emit_objc_zeroed (FILE *fp, tree decl, const char *name,
|
|
unsigned HOST_WIDE_INT size,
|
|
unsigned int align, tree meta)
|
|
{
|
|
section *ocs = data_section;
|
|
|
|
if (TREE_PURPOSE (meta) == get_identifier("OBJC2META"))
|
|
ocs = darwin_objc2_section (decl, meta, ocs);
|
|
else
|
|
ocs = darwin_objc1_section (decl, meta, ocs);
|
|
|
|
switch_to_section (ocs);
|
|
|
|
/* We shall declare that zero-sized meta-data are not valid (yet). */
|
|
gcc_assert (size);
|
|
fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));
|
|
|
|
/* ... and we let it deal with outputting one byte of zero for them too. */
|
|
darwin_asm_declare_object_name (fp, name, decl);
|
|
assemble_zeros (size);
|
|
}
|
|
|
|
/* This routine emits 'local' storage:
|
|
|
|
When Section Anchors are off this routine emits .zerofill commands in
|
|
sections named for their alignment.
|
|
|
|
When Section Anchors are on, smaller (non-zero-sized) items are placed in
|
|
the .static_data section so that the section anchoring system can see them.
|
|
Larger items are still placed in .zerofill sections, addressing PR33210.
|
|
The routine has no checking - it is all assumed to be done by the caller.
|
|
*/
|
|
static void
|
|
darwin_emit_local_bss (FILE *fp, tree decl, const char *name,
|
|
unsigned HOST_WIDE_INT size,
|
|
unsigned int l2align)
|
|
{
|
|
if (DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL)
|
|
{
|
|
/* Put smaller objects in _static_data, where the section anchors system
|
|
can get them.
|
|
However, if they are zero-sized punt them to yet a different section
|
|
(that is not allowed to participate in anchoring). */
|
|
if (!size)
|
|
{
|
|
fputs ("\t.section\t__DATA,__zobj_bss\n", fp);
|
|
in_section = darwin_sections[zobj_bss_section];
|
|
size = 1;
|
|
}
|
|
else
|
|
{
|
|
fputs ("\t.static_data\n", fp);
|
|
in_section = darwin_sections[static_data_section];
|
|
}
|
|
|
|
if (l2align)
|
|
fprintf (fp, "\t.align\t%u\n", l2align);
|
|
|
|
assemble_name (fp, name);
|
|
fprintf (fp, ":\n\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
|
|
}
|
|
else
|
|
{
|
|
/* When we are on a non-section anchor target (or not using section
|
|
anchors, we can get zero-sized items here. However, all we need to
|
|
do is to bump them to one byte and the section alignment will take
|
|
care of the rest. */
|
|
char secnam[64];
|
|
snprintf (secnam, 64, "__DATA,__bss");
|
|
unsigned int flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
|
|
in_section = get_section (secnam, flags, NULL);
|
|
fprintf (fp, "\t.zerofill %s,", secnam);
|
|
assemble_name (fp, name);
|
|
if (!size)
|
|
size = 1;
|
|
|
|
if (l2align)
|
|
fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",
|
|
size, (unsigned) l2align);
|
|
else
|
|
fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED",0\n", size);
|
|
}
|
|
|
|
(*targetm.encode_section_info) (decl, DECL_RTL (decl), false);
|
|
/* This is defined as a file-scope var, so we know to notify machopic. */
|
|
machopic_define_symbol (DECL_RTL (decl));
|
|
}
|
|
|
|
/* Emit a chunk of common. */
|
|
static void
|
|
darwin_emit_common (FILE *fp, const char *name,
|
|
unsigned HOST_WIDE_INT size, unsigned int align)
|
|
{
|
|
unsigned HOST_WIDE_INT rounded;
|
|
unsigned int l2align;
|
|
|
|
/* Earlier systems complain if the alignment exceeds the page size.
|
|
The magic number is 4096 * 8 - hard-coded for legacy systems. */
|
|
if (!emit_aligned_common && (align > 32768UL))
|
|
align = 4096UL; /* In units. */
|
|
else
|
|
align /= BITS_PER_UNIT;
|
|
|
|
/* Make sure we have a meaningful align. */
|
|
if (!align)
|
|
align = 1;
|
|
|
|
/* For earlier toolchains, we need to emit the var as a rounded size to
|
|
tell ld the alignment. */
|
|
if (size < align)
|
|
rounded = align;
|
|
else
|
|
rounded = (size + (align-1)) & ~(align-1);
|
|
|
|
l2align = floor_log2 (align);
|
|
|
|
in_section = comm_section;
|
|
/* We mustn't allow multiple public symbols to share an address when using
|
|
the normal OSX toolchain. */
|
|
if (!size)
|
|
{
|
|
/* Put at least one byte. */
|
|
size = 1;
|
|
/* This section can no longer participate in section anchoring. */
|
|
comm_section->common.flags |= SECTION_NO_ANCHOR;
|
|
}
|
|
|
|
fputs ("\t.comm\t", fp);
|
|
assemble_name (fp, name);
|
|
fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED,
|
|
emit_aligned_common?size:rounded);
|
|
if (l2align && emit_aligned_common)
|
|
fprintf (fp, ",%u", l2align);
|
|
fputs ("\n", fp);
|
|
}
|
|
|
|
/* Output a var which is all zero - into aligned BSS sections, common, lcomm
|
|
or coalescable data sections (for weak or comdat) as appropriate. */
|
|
|
|
void
|
|
darwin_output_aligned_bss (FILE *fp, tree decl, const char *name,
|
|
unsigned HOST_WIDE_INT size, unsigned int align)
|
|
{
|
|
unsigned int l2align;
|
|
bool one, pub, weak;
|
|
tree meta;
|
|
|
|
pub = TREE_PUBLIC (decl);
|
|
one = DECL_ONE_ONLY (decl);
|
|
weak = (DECL_P (decl)
|
|
&& DECL_WEAK (decl)
|
|
&& !lookup_attribute ("weak_import",
|
|
DECL_ATTRIBUTES (decl)));
|
|
|
|
#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
|
|
fprintf (fp, "# albss: %s (%lld,%d) ro %d cst %d stat %d com %d"
|
|
" pub %d weak %d one %d init %lx\n",
|
|
name, (long long)size, (int)align, TREE_READONLY (decl),
|
|
TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
|
|
pub, weak, one, (unsigned long)DECL_INITIAL (decl));
|
|
#endif
|
|
|
|
/* ObjC metadata can get put in BSS because varasm.c decides it's BSS
|
|
before the target has a chance to comment. */
|
|
if ((meta = is_objc_metadata (decl)))
|
|
{
|
|
darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
|
|
return;
|
|
}
|
|
|
|
/* Check that any initializer is valid. */
|
|
gcc_assert ((DECL_INITIAL (decl) == NULL)
|
|
|| (DECL_INITIAL (decl) == error_mark_node)
|
|
|| initializer_zerop (DECL_INITIAL (decl)));
|
|
|
|
gcc_assert (DECL_SECTION_NAME (decl) == NULL);
|
|
gcc_assert (!DECL_COMMON (decl));
|
|
|
|
/* Pick up the correct alignment. */
|
|
if (!size || !align)
|
|
align = DECL_ALIGN (decl);
|
|
|
|
l2align = floor_log2 (align / BITS_PER_UNIT);
|
|
gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
|
|
|
|
last_assemble_variable_decl = decl;
|
|
|
|
/* We would rather not have to check this here - but it seems that we might
|
|
be passed a decl that should be in coalesced space. */
|
|
if (one || weak)
|
|
{
|
|
/* Weak or COMDAT objects are put in mergeable sections. */
|
|
darwin_emit_weak_or_comdat (fp, decl, name, size,
|
|
ld_uses_coal_sects, DECL_ALIGN (decl));
|
|
return;
|
|
}
|
|
|
|
/* If this is not public, then emit according to local rules. */
|
|
if (!pub)
|
|
{
|
|
darwin_emit_local_bss (fp, decl, name, size, l2align);
|
|
return;
|
|
}
|
|
|
|
/* So we have a public symbol. */
|
|
if (DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL)
|
|
{
|
|
/* Put smaller objects in data, where the section anchors system can get
|
|
them. However, if they are zero-sized punt them to yet a different
|
|
section (that is not allowed to participate in anchoring). */
|
|
if (!size)
|
|
{
|
|
fputs ("\t.section\t__DATA,__zobj_data\n", fp);
|
|
in_section = darwin_sections[zobj_data_section];
|
|
size = 1;
|
|
}
|
|
else
|
|
{
|
|
fputs ("\t.data\n", fp);
|
|
in_section = data_section;
|
|
}
|
|
|
|
if (l2align)
|
|
fprintf (fp, "\t.align\t%u\n", l2align);
|
|
|
|
assemble_name (fp, name);
|
|
fprintf (fp, ":\n\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
|
|
}
|
|
else
|
|
{
|
|
/* Section anchors not in use. */
|
|
unsigned int flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
|
|
char secnam[64];
|
|
snprintf (secnam, 64, "__DATA,__common");
|
|
in_section = get_section (secnam, flags, NULL);
|
|
fprintf (fp, "\t.zerofill %s,", secnam);
|
|
assemble_name (fp, name);
|
|
if (!size)
|
|
size = 1;
|
|
|
|
if (l2align)
|
|
fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", size, l2align);
|
|
else
|
|
fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED",0\n", size);
|
|
}
|
|
(* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
|
|
}
|
|
|
|
/* Output a chunk of common, with alignment specified (where the target
|
|
supports this). */
|
|
void
|
|
darwin_asm_output_aligned_decl_common (FILE *fp, tree decl, const char *name,
|
|
unsigned HOST_WIDE_INT size,
|
|
unsigned int align)
|
|
{
|
|
unsigned int l2align;
|
|
bool one, weak;
|
|
tree meta;
|
|
|
|
/* No corresponding var. */
|
|
if (decl==NULL)
|
|
{
|
|
#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
|
|
fprintf (fp, "# adcom: %s (%d,%d) decl=0x0\n", name, (int)size, (int)align);
|
|
#endif
|
|
/* Common variables are limited to a maximum alignment of 2^15. */
|
|
if (align > 32768)
|
|
error_at (UNKNOWN_LOCATION, "common variables must have an alignment"
|
|
" of 32678 or less");
|
|
darwin_emit_common (fp, name, size, align);
|
|
return;
|
|
}
|
|
|
|
one = DECL_ONE_ONLY (decl);
|
|
weak = (DECL_P (decl)
|
|
&& DECL_WEAK (decl)
|
|
&& !lookup_attribute ("weak_import",
|
|
DECL_ATTRIBUTES (decl)));
|
|
|
|
#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
|
|
fprintf (fp, "# adcom: %s (%lld,%d) ro %d cst %d stat %d com %d pub %d"
|
|
" weak %d one %d init %lx\n",
|
|
name, (long long)size, (int)align, TREE_READONLY (decl),
|
|
TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
|
|
TREE_PUBLIC (decl), weak, one, (unsigned long)DECL_INITIAL (decl));
|
|
#endif
|
|
|
|
/* ObjC metadata can get put in BSS because varasm.c decides it's BSS
|
|
before the target has a chance to comment. */
|
|
if ((meta = is_objc_metadata (decl)))
|
|
{
|
|
darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
|
|
return;
|
|
}
|
|
|
|
/* We shouldn't be messing with this if the decl has a section name. */
|
|
gcc_checking_assert (DECL_SECTION_NAME (decl) == NULL);
|
|
|
|
/* We would rather not have to check this here - but it seems that we might
|
|
be passed a decl that should be in coalesced space. */
|
|
if (one || weak)
|
|
{
|
|
/* Weak or COMDAT objects are put in mergable sections. */
|
|
darwin_emit_weak_or_comdat (fp, decl, name, size,
|
|
ld_uses_coal_sects, DECL_ALIGN (decl));
|
|
return;
|
|
}
|
|
|
|
/* We should only get here for DECL_COMMON, with a zero init (and, in
|
|
principle, only for public symbols too - although we deal with local
|
|
ones below). */
|
|
|
|
/* Check the initializer is OK. */
|
|
gcc_assert (DECL_COMMON (decl)
|
|
&& ((DECL_INITIAL (decl) == NULL)
|
|
|| (DECL_INITIAL (decl) == error_mark_node)
|
|
|| initializer_zerop (DECL_INITIAL (decl))));
|
|
|
|
last_assemble_variable_decl = decl;
|
|
|
|
if (!size || !align)
|
|
align = DECL_ALIGN (decl);
|
|
|
|
l2align = floor_log2 (align / BITS_PER_UNIT);
|
|
/* Check we aren't asking for more aligment than the platform allows. */
|
|
gcc_checking_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
|
|
|
|
if (TREE_PUBLIC (decl) != 0)
|
|
{
|
|
/* Common variables are limited to a maximum alignment of 2^15. */
|
|
if (l2align > 15)
|
|
error_at (DECL_SOURCE_LOCATION (decl), "common variables must have"
|
|
" an alignment of 32678 or less");
|
|
darwin_emit_common (fp, name, size, align);
|
|
}
|
|
else
|
|
darwin_emit_local_bss (fp, decl, name, size, l2align);
|
|
}
|
|
|
|
/* Output a chunk of BSS with alignment specfied. */
|
|
void
|
|
darwin_asm_output_aligned_decl_local (FILE *fp, tree decl, const char *name,
|
|
unsigned HOST_WIDE_INT size,
|
|
unsigned int align)
|
|
{
|
|
unsigned long l2align;
|
|
bool one, weak;
|
|
tree meta;
|
|
|
|
one = DECL_ONE_ONLY (decl);
|
|
weak = (DECL_P (decl)
|
|
&& DECL_WEAK (decl)
|
|
&& !lookup_attribute ("weak_import",
|
|
DECL_ATTRIBUTES (decl)));
|
|
|
|
#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
|
|
fprintf (fp, "# adloc: %s (%lld,%d) ro %d cst %d stat %d one %d pub %d"
|
|
" weak %d init %lx\n",
|
|
name, (long long)size, (int)align, TREE_READONLY (decl),
|
|
TREE_CONSTANT (decl), TREE_STATIC (decl), one, TREE_PUBLIC (decl),
|
|
weak , (unsigned long)DECL_INITIAL (decl));
|
|
#endif
|
|
|
|
/* ObjC metadata can get put in BSS because varasm.c decides it's BSS
|
|
before the target has a chance to comment. */
|
|
if ((meta = is_objc_metadata (decl)))
|
|
{
|
|
darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
|
|
return;
|
|
}
|
|
|
|
/* We shouldn't be messing with this if the decl has a section name. */
|
|
gcc_assert (DECL_SECTION_NAME (decl) == NULL);
|
|
|
|
/* We would rather not have to check this here - but it seems that we might
|
|
be passed a decl that should be in coalesced space. */
|
|
if (one || weak)
|
|
{
|
|
/* Weak or COMDAT objects are put in mergable sections. */
|
|
darwin_emit_weak_or_comdat (fp, decl, name, size,
|
|
ld_uses_coal_sects, DECL_ALIGN (decl));
|
|
return;
|
|
}
|
|
|
|
/* .. and it should be suitable for placement in local mem. */
|
|
gcc_assert(!TREE_PUBLIC (decl) && !DECL_COMMON (decl));
|
|
/* .. and any initializer must be all-zero. */
|
|
gcc_assert ((DECL_INITIAL (decl) == NULL)
|
|
|| (DECL_INITIAL (decl) == error_mark_node)
|
|
|| initializer_zerop (DECL_INITIAL (decl)));
|
|
|
|
last_assemble_variable_decl = decl;
|
|
|
|
if (!size || !align)
|
|
align = DECL_ALIGN (decl);
|
|
|
|
l2align = floor_log2 (align / BITS_PER_UNIT);
|
|
gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
|
|
|
|
darwin_emit_local_bss (fp, decl, name, size, l2align);
|
|
}
|
|
|
|
/* Emit an assembler directive to set visibility for a symbol. The
|
|
only supported visibilities are VISIBILITY_DEFAULT and
|
|
VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
|
|
extern". There is no MACH-O equivalent of ELF's
|
|
VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
|
|
|
|
void
|
|
darwin_assemble_visibility (tree decl, int vis)
|
|
{
|
|
if (vis == VISIBILITY_DEFAULT)
|
|
;
|
|
else if (vis == VISIBILITY_HIDDEN || vis == VISIBILITY_INTERNAL)
|
|
{
|
|
fputs ("\t.private_extern ", asm_out_file);
|
|
assemble_name (asm_out_file,
|
|
(IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
|
|
fputs ("\n", asm_out_file);
|
|
}
|
|
else
|
|
warning (OPT_Wattributes, "protected visibility attribute "
|
|
"not supported in this configuration; ignored");
|
|
}
|
|
|
|
/* vec used by darwin_asm_dwarf_section.
|
|
Maybe a hash tab would be better here - but the intention is that this is
|
|
a very short list (fewer than 16 items) and each entry should (ideally,
|
|
eventually) only be presented once.
|
|
|
|
A structure to hold a dwarf debug section used entry. */
|
|
|
|
typedef struct GTY(()) dwarf_sect_used_entry {
|
|
const char *name;
|
|
unsigned count;
|
|
}
|
|
dwarf_sect_used_entry;
|
|
|
|
|
|
/* A list of used __DWARF sections. */
|
|
static GTY (()) vec<dwarf_sect_used_entry, va_gc> *dwarf_sect_names_table;
|
|
|
|
/* This is called when we are asked to assemble a named section and the
|
|
name begins with __DWARF,. We keep a list of the section names (without
|
|
the __DWARF, prefix) and use this to emit our required start label on the
|
|
first switch to each section. */
|
|
|
|
static void
|
|
darwin_asm_dwarf_section (const char *name, unsigned int flags,
|
|
tree ARG_UNUSED (decl), bool is_for_lto)
|
|
{
|
|
unsigned i;
|
|
int namelen, extra = 0;
|
|
const char *sect, *lto_add = "";
|
|
char sname[64];
|
|
dwarf_sect_used_entry *ref;
|
|
bool found = false;
|
|
|
|
gcc_checking_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
|
|
== (SECTION_DEBUG | SECTION_NAMED));
|
|
|
|
/* We know that the name starts with __DWARF, or __GNU_DAWRF_LTO */
|
|
sect = strchr (name, ',') + 1;
|
|
namelen = strchr (sect, ',') - sect;
|
|
gcc_checking_assert (namelen);
|
|
|
|
/* The section switch is output as written... */
|
|
fprintf (asm_out_file, "\t.section %s\n", name);
|
|
|
|
/* ... but the string we keep to make section start labels needs
|
|
adjustment for lto cases. */
|
|
if (is_for_lto)
|
|
{
|
|
lto_add = "_lto";
|
|
extra = 4;
|
|
}
|
|
|
|
snprintf (sname, 64, "%.*s%.*s", namelen, sect, extra, lto_add);
|
|
namelen += extra;
|
|
|
|
if (dwarf_sect_names_table == NULL)
|
|
vec_alloc (dwarf_sect_names_table, 16);
|
|
else
|
|
for (i = 0;
|
|
dwarf_sect_names_table->iterate (i, &ref);
|
|
i++)
|
|
{
|
|
if (!ref)
|
|
break;
|
|
if (!strcmp (ref->name, sname))
|
|
{
|
|
found = true;
|
|
ref->count++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found)
|
|
{
|
|
dwarf_sect_used_entry e;
|
|
fprintf (asm_out_file, "Lsection%.*s:\n", namelen, sname);
|
|
e.count = 1;
|
|
e.name = xstrdup (sname);
|
|
vec_safe_push (dwarf_sect_names_table, e);
|
|
}
|
|
}
|
|
|
|
/* Output a difference of two labels that will be an assembly time
|
|
constant if the two labels are local. (.long lab1-lab2 will be
|
|
very different if lab1 is at the boundary between two sections; it
|
|
will be relocated according to the second section, not the first,
|
|
so one ends up with a difference between labels in different
|
|
sections, which is bad in the dwarf2 eh context for instance.) */
|
|
|
|
static int darwin_dwarf_label_counter;
|
|
|
|
void
|
|
darwin_asm_output_dwarf_delta (FILE *file, int size,
|
|
const char *lab1, const char *lab2,
|
|
HOST_WIDE_INT offset)
|
|
{
|
|
int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
|
|
&& lab2[0] == '*' && lab2[1] == 'L');
|
|
const char *directive = (size == 8 ? ".quad" : ".long");
|
|
|
|
if (islocaldiff)
|
|
fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
|
|
else
|
|
fprintf (file, "\t%s\t", directive);
|
|
|
|
assemble_name_raw (file, lab1);
|
|
fprintf (file, "-");
|
|
assemble_name_raw (file, lab2);
|
|
if (offset != 0)
|
|
fprintf (file, "+" HOST_WIDE_INT_PRINT_DEC, offset);
|
|
if (islocaldiff)
|
|
fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
|
|
}
|
|
|
|
/* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
|
|
offsets are not represented using relocs in .o files; either the
|
|
section never leaves the .o file, or the linker or other tool is
|
|
responsible for parsing the DWARF and updating the offsets. */
|
|
|
|
void
|
|
darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
|
|
HOST_WIDE_INT offset, section *base)
|
|
{
|
|
char sname[64];
|
|
int namelen, extra = 0;
|
|
bool is_for_lto;
|
|
const char *lto_add = "";
|
|
|
|
gcc_checking_assert (base->common.flags & SECTION_NAMED);
|
|
is_for_lto = strncmp (base->named.name, "__GNU_DWARF_LTO,", 16) == 0;
|
|
gcc_checking_assert (is_for_lto
|
|
|| strncmp (base->named.name, "__DWARF,", 8) == 0);
|
|
const char *name = strchr (base->named.name, ',') + 1;
|
|
gcc_checking_assert (name);
|
|
|
|
namelen = strchr (name, ',') - (name);
|
|
if (is_for_lto)
|
|
{
|
|
lto_add = "_lto";
|
|
extra = 4;
|
|
}
|
|
snprintf (sname, 64, "*Lsection%.*s%.*s", namelen, name, extra, lto_add);
|
|
darwin_asm_output_dwarf_delta (file, size, lab, sname, offset);
|
|
}
|
|
|
|
/* Called from the within the TARGET_ASM_FILE_START for each target. */
|
|
|
|
void
|
|
darwin_file_start (void)
|
|
{
|
|
/* Nothing to do. */
|
|
}
|
|
|
|
/* Called for the TARGET_ASM_FILE_END hook.
|
|
Emit the mach-o pic indirection data, the lto data and, finally a flag
|
|
to tell the linker that it can break the file object into sections and
|
|
move those around for efficiency. */
|
|
|
|
void
|
|
darwin_file_end (void)
|
|
{
|
|
if (!vec_safe_is_empty (ctors))
|
|
finalize_ctors ();
|
|
if (!vec_safe_is_empty (dtors))
|
|
finalize_dtors ();
|
|
|
|
/* If we are expecting to output NeXT ObjC meta-data, (and we actually see
|
|
some) then we output the fix-and-continue marker (Image Info).
|
|
This applies to Objective C, Objective C++ and LTO with either language
|
|
as part of the input. */
|
|
if (flag_next_runtime && objc_metadata_seen)
|
|
{
|
|
unsigned int flags = 0;
|
|
if (flag_objc_abi >= 2)
|
|
{
|
|
flags = 16;
|
|
switch_to_section (darwin_sections[objc2_image_info_section]);
|
|
}
|
|
else
|
|
switch_to_section (darwin_sections[objc_image_info_section]);
|
|
|
|
ASM_OUTPUT_ALIGN (asm_out_file, 2);
|
|
fputs ("L_OBJC_ImageInfo:\n", asm_out_file);
|
|
|
|
flags |= (flag_replace_objc_classes && classes_seen) ? 1 : 0;
|
|
flags |= flag_objc_gc ? 2 : 0;
|
|
|
|
fprintf (asm_out_file, "\t.long\t0\n\t.long\t%u\n", flags);
|
|
}
|
|
|
|
machopic_finish (asm_out_file);
|
|
if (flag_apple_kext)
|
|
{
|
|
/* These sections are only used for kernel code. */
|
|
switch_to_section (darwin_sections[constructor_section]);
|
|
switch_to_section (darwin_sections[destructor_section]);
|
|
ASM_OUTPUT_ALIGN (asm_out_file, 1);
|
|
}
|
|
|
|
/* If there was LTO assembler output, append it to asm_out_file. */
|
|
if (lto_asm_out_name)
|
|
{
|
|
int n;
|
|
char *buf, *lto_asm_txt;
|
|
|
|
/* Shouldn't be here if we failed to switch back. */
|
|
gcc_assert (! saved_asm_out_file);
|
|
|
|
lto_asm_out_file = fopen (lto_asm_out_name, "r");
|
|
if (lto_asm_out_file == NULL)
|
|
fatal_error (input_location,
|
|
"failed to open temporary file %s with LTO output",
|
|
lto_asm_out_name);
|
|
fseek (lto_asm_out_file, 0, SEEK_END);
|
|
n = ftell (lto_asm_out_file);
|
|
if (n > 0)
|
|
{
|
|
fseek (lto_asm_out_file, 0, SEEK_SET);
|
|
lto_asm_txt = buf = (char *) xmalloc (n + 1);
|
|
while (fgets (lto_asm_txt, n, lto_asm_out_file))
|
|
fputs (lto_asm_txt, asm_out_file);
|
|
/* Put a termination label. */
|
|
fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
|
|
LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
|
|
fprintf (asm_out_file, "L_GNU_LTO%d:\t;# end of lto\n",
|
|
lto_section_num);
|
|
/* Make sure our termination label stays in this section. */
|
|
fputs ("\t.space\t1\n", asm_out_file);
|
|
}
|
|
|
|
/* Remove the temporary file. */
|
|
fclose (lto_asm_out_file);
|
|
unlink_if_ordinary (lto_asm_out_name);
|
|
free (lto_asm_out_name);
|
|
}
|
|
|
|
/* Output the names and indices. */
|
|
if (lto_section_names && lto_section_names->length ())
|
|
{
|
|
int count;
|
|
darwin_lto_section_e *ref;
|
|
/* For now, we'll make the offsets 4 bytes and unaligned - we'll fix
|
|
the latter up ourselves. */
|
|
const char *op = integer_asm_op (4,0);
|
|
|
|
/* Emit the names. */
|
|
fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
|
|
LTO_SEGMENT_NAME, LTO_NAMES_SECTION);
|
|
FOR_EACH_VEC_ELT (*lto_section_names, count, ref)
|
|
{
|
|
fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\n", count);
|
|
/* We have to jump through hoops to get the values of the intra-section
|
|
offsets... */
|
|
fprintf (asm_out_file,
|
|
"\t.set L$gnu$lto$noff%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME0\n",
|
|
count, count);
|
|
fprintf (asm_out_file,
|
|
"\t.set L$gnu$lto$nsiz%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME%d\n",
|
|
count, count+1, count);
|
|
fprintf (asm_out_file, "\t.asciz\t\"%s\"\n", ref->sectname);
|
|
}
|
|
fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\t;# end\n", lto_section_num);
|
|
/* make sure our termination label stays in this section. */
|
|
fputs ("\t.space\t1\n", asm_out_file);
|
|
|
|
/* Emit the Index. */
|
|
fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
|
|
LTO_SEGMENT_NAME, LTO_INDEX_SECTION);
|
|
fputs ("\t.align\t2\n", asm_out_file);
|
|
fputs ("# Section offset, Section length, Name offset, Name length\n",
|
|
asm_out_file);
|
|
FOR_EACH_VEC_ELT (*lto_section_names, count, ref)
|
|
{
|
|
fprintf (asm_out_file, "%s L$gnu$lto$offs%d\t;# %s\n",
|
|
op, count, ref->sectname);
|
|
fprintf (asm_out_file, "%s L$gnu$lto$size%d\n", op, count);
|
|
fprintf (asm_out_file, "%s L$gnu$lto$noff%d\n", op, count);
|
|
fprintf (asm_out_file, "%s L$gnu$lto$nsiz%d\n", op, count);
|
|
}
|
|
}
|
|
|
|
/* If we have section anchors, then we must prevent the linker from
|
|
re-arranging data. */
|
|
if (!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
|
|
fprintf (asm_out_file, "\t.subsections_via_symbols\n");
|
|
|
|
/* We rely on this being NULL at the start of compilation; reset it here
|
|
so that JIT can reuse a context. */
|
|
if (dwarf_sect_names_table != NULL)
|
|
{
|
|
dwarf_sect_names_table->truncate (0);
|
|
dwarf_sect_names_table = NULL;
|
|
}
|
|
}
|
|
|
|
/* TODO: Add a language hook for identifying if a decl is a vtable. */
|
|
#define DARWIN_VTABLE_P(DECL) 0
|
|
|
|
/* Cross-module name binding. Darwin does not support overriding
|
|
functions at dynamic-link time, except for vtables in kexts. */
|
|
|
|
bool
|
|
darwin_binds_local_p (const_tree decl)
|
|
{
|
|
/* We use the "shlib" input to indicate that a symbol should be
|
|
considered overridable; only relevant for vtables in kernel modules
|
|
on earlier system versions, and with a TODO to complete. */
|
|
bool force_overridable = TARGET_KEXTABI && DARWIN_VTABLE_P (decl);
|
|
return default_binds_local_p_3 (decl, force_overridable /* shlib */,
|
|
false /* weak dominate */,
|
|
false /* extern_protected_data */,
|
|
false /* common_local_p */);
|
|
}
|
|
|
|
/* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
|
|
anchor relative to ".", the current section position. We cannot use
|
|
the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
|
|
void
|
|
darwin_asm_output_anchor (rtx symbol)
|
|
{
|
|
fprintf (asm_out_file, "\t.set\t");
|
|
assemble_name (asm_out_file, XSTR (symbol, 0));
|
|
fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
|
|
SYMBOL_REF_BLOCK_OFFSET (symbol));
|
|
}
|
|
|
|
/* Disable section anchoring on any section containing a zero-sized
|
|
object. */
|
|
bool
|
|
darwin_use_anchors_for_symbol_p (const_rtx symbol)
|
|
{
|
|
if (DARWIN_SECTION_ANCHORS && flag_section_anchors)
|
|
{
|
|
section *sect;
|
|
/* If the section contains a zero-sized object it's ineligible. */
|
|
sect = SYMBOL_REF_BLOCK (symbol)->sect;
|
|
/* This should have the effect of disabling anchors for vars that follow
|
|
any zero-sized one, in a given section. */
|
|
if (sect->common.flags & SECTION_NO_ANCHOR)
|
|
return false;
|
|
|
|
/* Also check the normal reasons for suppressing. */
|
|
return default_use_anchors_for_symbol_p (symbol);
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
|
|
/* Set the darwin specific attributes on TYPE. */
|
|
void
|
|
darwin_set_default_type_attributes (tree type)
|
|
{
|
|
if (darwin_ms_struct
|
|
&& TREE_CODE (type) == RECORD_TYPE)
|
|
TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
|
|
NULL_TREE,
|
|
TYPE_ATTRIBUTES (type));
|
|
}
|
|
|
|
/* True, iff we're generating code for loadable kernel extensions. */
|
|
|
|
bool
|
|
darwin_kextabi_p (void) {
|
|
return flag_apple_kext;
|
|
}
|
|
|
|
void
|
|
darwin_override_options (void)
|
|
{
|
|
/* Keep track of which (major) version we're generating code for. */
|
|
if (darwin_macosx_version_min)
|
|
{
|
|
if (strverscmp (darwin_macosx_version_min, "10.7") >= 0)
|
|
generating_for_darwin_version = 11;
|
|
else if (strverscmp (darwin_macosx_version_min, "10.6") >= 0)
|
|
generating_for_darwin_version = 10;
|
|
else if (strverscmp (darwin_macosx_version_min, "10.5") >= 0)
|
|
generating_for_darwin_version = 9;
|
|
else if (strverscmp (darwin_macosx_version_min, "10.4") >= 0)
|
|
generating_for_darwin_version = 8;
|
|
|
|
/* Earlier versions are not specifically accounted, until required. */
|
|
}
|
|
|
|
/* Some codegen needs to account for the capabilities of the target
|
|
linker. */
|
|
if (darwin_target_linker)
|
|
{
|
|
/* Older Darwin ld could not coalesce weak entities without them being
|
|
placed in special sections. */
|
|
if (strverscmp (darwin_target_linker, MIN_LD64_NO_COAL_SECTS) < 0)
|
|
ld_uses_coal_sects = true;
|
|
|
|
/* Some newer assemblers emit section start temp symbols for mod init
|
|
and term sections if there is no suitable symbol present already.
|
|
The temp symbols are linker visible and therefore appear in the
|
|
symbol tables. Since the temp symbol number can vary when debug is
|
|
enabled, that causes compare-debug fails. The solution is to provide
|
|
a stable linker-visible symbol. */
|
|
if (strverscmp (darwin_target_linker,
|
|
MIN_LD64_INIT_TERM_START_LABELS) >= 0)
|
|
ld_init_term_start_labels = true;
|
|
}
|
|
|
|
/* In principle, this should be c-family only. However, we really need to
|
|
set sensible defaults for LTO as well, since the section selection stuff
|
|
should check for correctness re. the ABI. TODO: check and provide the
|
|
flags (runtime & ABI) from the lto wrapper). */
|
|
|
|
/* At present, make a hard update to the runtime version based on the target
|
|
OS version. */
|
|
if (flag_next_runtime)
|
|
{
|
|
if (generating_for_darwin_version > 10)
|
|
flag_next_runtime = 100705;
|
|
else if (generating_for_darwin_version > 9)
|
|
flag_next_runtime = 100608;
|
|
else if (generating_for_darwin_version > 8)
|
|
flag_next_runtime = 100508;
|
|
else
|
|
flag_next_runtime = 100000;
|
|
}
|
|
|
|
/* Unless set, force ABI=2 for NeXT and m64, 0 otherwise. */
|
|
if (!global_options_set.x_flag_objc_abi)
|
|
global_options.x_flag_objc_abi
|
|
= (!flag_next_runtime)
|
|
? 0
|
|
: (TARGET_64BIT ? 2
|
|
: (generating_for_darwin_version >= 9) ? 1
|
|
: 0);
|
|
|
|
if (global_options_set.x_flag_objc_abi && flag_next_runtime)
|
|
{
|
|
if (TARGET_64BIT && global_options.x_flag_objc_abi != 2)
|
|
/* The Objective-C family ABI 2 is the only valid version NeXT/m64. */
|
|
error_at (UNKNOWN_LOCATION,
|
|
"%<-fobjc-abi-version%> 2 must be used for 64 bit targets"
|
|
" with %<-fnext-runtime%>");
|
|
else if (!TARGET_64BIT && global_options.x_flag_objc_abi >= 2)
|
|
/* ABI versions 0 and 1 are the only valid versions NeXT/m32. */
|
|
error_at (UNKNOWN_LOCATION,
|
|
"%<-fobjc-abi-version%> %d is not supported for 32 bit"
|
|
" targets with %<-fnext-runtime%>",
|
|
global_options.x_flag_objc_abi);
|
|
}
|
|
|
|
/* Don't emit DWARF3/4 unless specifically selected. This is a
|
|
workaround for tool bugs. */
|
|
if (!global_options_set.x_dwarf_strict)
|
|
dwarf_strict = 1;
|
|
if (!global_options_set.x_dwarf_version)
|
|
dwarf_version = 2;
|
|
|
|
if (global_options_set.x_dwarf_split_debug_info)
|
|
{
|
|
inform (input_location,
|
|
"%<-gsplit-dwarf%> is not supported on this platform, ignored");
|
|
dwarf_split_debug_info = 0;
|
|
global_options_set.x_dwarf_split_debug_info = 0;
|
|
}
|
|
|
|
/* Do not allow unwind tables to be generated by default for m32.
|
|
fnon-call-exceptions will override this, regardless of what we do. */
|
|
if (generating_for_darwin_version < 10
|
|
&& !global_options_set.x_flag_asynchronous_unwind_tables
|
|
&& !TARGET_64BIT)
|
|
global_options.x_flag_asynchronous_unwind_tables = 0;
|
|
|
|
/* Disable -freorder-blocks-and-partition when unwind tables are being
|
|
emitted for Darwin < 9 (OSX 10.5).
|
|
The strategy is, "Unless the User has specifically set/unset an unwind
|
|
flag we will switch off -freorder-blocks-and-partition when unwind tables
|
|
will be generated". If the User specifically sets flags... we assume
|
|
(s)he knows why... */
|
|
if (generating_for_darwin_version < 9
|
|
&& global_options_set.x_flag_reorder_blocks_and_partition
|
|
&& ((global_options.x_flag_exceptions /* User, c++, java */
|
|
&& !global_options_set.x_flag_exceptions) /* User specified... */
|
|
|| (global_options.x_flag_unwind_tables
|
|
&& !global_options_set.x_flag_unwind_tables)
|
|
|| (global_options.x_flag_non_call_exceptions
|
|
&& !global_options_set.x_flag_non_call_exceptions)
|
|
|| (global_options.x_flag_asynchronous_unwind_tables
|
|
&& !global_options_set.x_flag_asynchronous_unwind_tables)))
|
|
{
|
|
inform (input_location,
|
|
"%<-freorder-blocks-and-partition%> does not work with "
|
|
"exceptions on this architecture");
|
|
flag_reorder_blocks_and_partition = 0;
|
|
flag_reorder_blocks = 1;
|
|
}
|
|
|
|
/* FIXME: flag_objc_sjlj_exceptions is no longer needed since there is only
|
|
one valid choice of exception scheme for each runtime. */
|
|
if (!global_options_set.x_flag_objc_sjlj_exceptions)
|
|
global_options.x_flag_objc_sjlj_exceptions =
|
|
flag_next_runtime && !TARGET_64BIT;
|
|
|
|
/* FIXME: and this could be eliminated then too. */
|
|
if (!global_options_set.x_flag_exceptions
|
|
&& flag_objc_exceptions
|
|
&& TARGET_64BIT)
|
|
flag_exceptions = 1;
|
|
|
|
if (flag_mkernel || flag_apple_kext)
|
|
{
|
|
/* -mkernel implies -fapple-kext for C++ */
|
|
if (lang_GNU_CXX ())
|
|
flag_apple_kext = 1;
|
|
|
|
flag_no_common = 1;
|
|
|
|
/* No EH in kexts. */
|
|
flag_exceptions = 0;
|
|
/* No -fnon-call-exceptions data in kexts. */
|
|
flag_non_call_exceptions = 0;
|
|
/* so no tables either.. */
|
|
flag_unwind_tables = 0;
|
|
flag_asynchronous_unwind_tables = 0;
|
|
}
|
|
|
|
if (flag_var_tracking_uninit == 0
|
|
&& generating_for_darwin_version >= 9
|
|
&& (flag_gtoggle ? (debug_info_level == DINFO_LEVEL_NONE)
|
|
: (debug_info_level >= DINFO_LEVEL_NORMAL))
|
|
&& write_symbols == DWARF2_DEBUG)
|
|
flag_var_tracking_uninit = flag_var_tracking;
|
|
|
|
/* Final check on PCI options; for Darwin these are not dependent on the PIE
|
|
ones, although PIE does require PIC to support it. */
|
|
if (MACHO_DYNAMIC_NO_PIC_P)
|
|
{
|
|
if (flag_pic)
|
|
warning_at (UNKNOWN_LOCATION, 0,
|
|
"%<-mdynamic-no-pic%> overrides %<-fpic%>, %<-fPIC%>,"
|
|
" %<-fpie%> or %<-fPIE%>");
|
|
flag_pic = 0;
|
|
}
|
|
else if (flag_pic == 1
|
|
|| (flag_pic == 0 && !(flag_mkernel || flag_apple_kext)))
|
|
{
|
|
/* Darwin's -fpic is -fPIC.
|
|
We only support "static" code in the kernel and kernel exts. */
|
|
flag_pic = 2;
|
|
}
|
|
|
|
/* Linkers >= ld64-62.1 (at least) are capable of making the necessary PIC
|
|
indirections and we no longer need to emit pic symbol stubs.
|
|
However, if we are generating code for earlier ones (or for use in the
|
|
kernel) the stubs might still be required, and this will be set true.
|
|
If the user sets it on or off - then that takes precedence.
|
|
|
|
Linkers that don't need stubs, don't need the EH symbol markers either.
|
|
*/
|
|
|
|
if (!global_options_set.x_darwin_symbol_stubs)
|
|
{
|
|
if (darwin_target_linker)
|
|
{
|
|
if (strverscmp (darwin_target_linker, MIN_LD64_OMIT_STUBS) < 0)
|
|
{
|
|
darwin_symbol_stubs = true;
|
|
ld_needs_eh_markers = true;
|
|
}
|
|
}
|
|
else if (generating_for_darwin_version < 9)
|
|
{
|
|
/* If we don't know the linker version and we're targeting an old
|
|
system, we know no better than to assume the use of an earlier
|
|
linker. */
|
|
darwin_symbol_stubs = true;
|
|
ld_needs_eh_markers = true;
|
|
}
|
|
}
|
|
else if (DARWIN_X86 && darwin_symbol_stubs && TARGET_64BIT)
|
|
{
|
|
inform (input_location,
|
|
"%<-mpic-symbol-stubs%> is not required for 64-bit code "
|
|
"(ignored)");
|
|
darwin_symbol_stubs = false;
|
|
}
|
|
|
|
if (generating_for_darwin_version >= 9)
|
|
/* Later systems can support aligned common. */
|
|
emit_aligned_common = true;
|
|
|
|
/* The c_dialect...() macros are not available to us here. */
|
|
darwin_running_cxx = (strstr (lang_hooks.name, "C++") != 0);
|
|
}
|
|
|
|
#if DARWIN_PPC
|
|
/* Add $LDBL128 suffix to long double builtins for ppc darwin. */
|
|
|
|
static void
|
|
darwin_patch_builtin (enum built_in_function fncode)
|
|
{
|
|
tree fn = builtin_decl_explicit (fncode);
|
|
tree sym;
|
|
char *newname;
|
|
|
|
if (!fn)
|
|
return;
|
|
|
|
sym = DECL_ASSEMBLER_NAME (fn);
|
|
newname = ACONCAT (("_", IDENTIFIER_POINTER (sym), "$LDBL128", NULL));
|
|
|
|
set_user_assembler_name (fn, newname);
|
|
|
|
fn = builtin_decl_implicit (fncode);
|
|
if (fn)
|
|
set_user_assembler_name (fn, newname);
|
|
}
|
|
|
|
void
|
|
darwin_patch_builtins (void)
|
|
{
|
|
if (LONG_DOUBLE_TYPE_SIZE != 128)
|
|
return;
|
|
|
|
#define PATCH_BUILTIN(fncode) darwin_patch_builtin (fncode);
|
|
#define PATCH_BUILTIN_NO64(fncode) \
|
|
if (!TARGET_64BIT) \
|
|
darwin_patch_builtin (fncode);
|
|
#define PATCH_BUILTIN_VARIADIC(fncode) \
|
|
if (!TARGET_64BIT \
|
|
&& (strverscmp (darwin_macosx_version_min, "10.3.9") >= 0)) \
|
|
darwin_patch_builtin (fncode);
|
|
#include "darwin-ppc-ldouble-patch.def"
|
|
#undef PATCH_BUILTIN
|
|
#undef PATCH_BUILTIN_NO64
|
|
#undef PATCH_BUILTIN_VARIADIC
|
|
}
|
|
#endif
|
|
|
|
/* CFStrings implementation. */
|
|
static GTY(()) tree cfstring_class_reference = NULL_TREE;
|
|
static GTY(()) tree cfstring_type_node = NULL_TREE;
|
|
static GTY(()) tree ccfstring_type_node = NULL_TREE;
|
|
static GTY(()) tree pccfstring_type_node = NULL_TREE;
|
|
static GTY(()) tree pcint_type_node = NULL_TREE;
|
|
static GTY(()) tree pcchar_type_node = NULL_TREE;
|
|
|
|
static enum built_in_function darwin_builtin_cfstring;
|
|
|
|
/* Store all constructed constant CFStrings in a hash table so that
|
|
they get uniqued properly. */
|
|
|
|
typedef struct GTY ((for_user)) cfstring_descriptor {
|
|
/* The string literal. */
|
|
tree literal;
|
|
/* The resulting constant CFString. */
|
|
tree constructor;
|
|
} cfstring_descriptor;
|
|
|
|
struct cfstring_hasher : ggc_ptr_hash<cfstring_descriptor>
|
|
{
|
|
static hashval_t hash (cfstring_descriptor *);
|
|
static bool equal (cfstring_descriptor *, cfstring_descriptor *);
|
|
};
|
|
|
|
static GTY (()) hash_table<cfstring_hasher> *cfstring_htab;
|
|
|
|
static tree
|
|
add_builtin_field_decl (tree type, const char *name, tree **chain)
|
|
{
|
|
tree field = build_decl (BUILTINS_LOCATION, FIELD_DECL,
|
|
get_identifier (name), type);
|
|
|
|
if (*chain != NULL)
|
|
**chain = field;
|
|
*chain = &DECL_CHAIN (field);
|
|
|
|
return field;
|
|
}
|
|
|
|
tree
|
|
darwin_init_cfstring_builtins (unsigned builtin_cfstring)
|
|
{
|
|
tree cfsfun, fields, pccfstring_ftype_pcchar;
|
|
tree *chain = NULL;
|
|
|
|
darwin_builtin_cfstring =
|
|
(enum built_in_function) builtin_cfstring;
|
|
|
|
/* struct __builtin_CFString {
|
|
const int *isa; (will point at
|
|
int flags; __CFConstantStringClassReference)
|
|
const char *str;
|
|
long length;
|
|
}; */
|
|
|
|
pcint_type_node = build_pointer_type
|
|
(build_qualified_type (integer_type_node, TYPE_QUAL_CONST));
|
|
|
|
pcchar_type_node = build_pointer_type
|
|
(build_qualified_type (char_type_node, TYPE_QUAL_CONST));
|
|
|
|
cfstring_type_node = (*lang_hooks.types.make_type) (RECORD_TYPE);
|
|
|
|
/* Have to build backwards for finish struct. */
|
|
fields = add_builtin_field_decl (long_integer_type_node, "length", &chain);
|
|
add_builtin_field_decl (pcchar_type_node, "str", &chain);
|
|
add_builtin_field_decl (integer_type_node, "flags", &chain);
|
|
add_builtin_field_decl (pcint_type_node, "isa", &chain);
|
|
finish_builtin_struct (cfstring_type_node, "__builtin_CFString",
|
|
fields, NULL_TREE);
|
|
|
|
/* const struct __builtin_CFstring *
|
|
__builtin___CFStringMakeConstantString (const char *); */
|
|
|
|
ccfstring_type_node = build_qualified_type
|
|
(cfstring_type_node, TYPE_QUAL_CONST);
|
|
pccfstring_type_node = build_pointer_type (ccfstring_type_node);
|
|
pccfstring_ftype_pcchar = build_function_type_list
|
|
(pccfstring_type_node, pcchar_type_node, NULL_TREE);
|
|
|
|
cfsfun = build_decl (BUILTINS_LOCATION, FUNCTION_DECL,
|
|
get_identifier ("__builtin___CFStringMakeConstantString"),
|
|
pccfstring_ftype_pcchar);
|
|
|
|
TREE_PUBLIC (cfsfun) = 1;
|
|
DECL_EXTERNAL (cfsfun) = 1;
|
|
DECL_ARTIFICIAL (cfsfun) = 1;
|
|
/* Make a lang-specific section - dup_lang_specific_decl makes a new node
|
|
in place of the existing, which may be NULL. */
|
|
DECL_LANG_SPECIFIC (cfsfun) = NULL;
|
|
(*lang_hooks.dup_lang_specific_decl) (cfsfun);
|
|
set_decl_built_in_function (cfsfun, BUILT_IN_MD, darwin_builtin_cfstring);
|
|
lang_hooks.builtin_function (cfsfun);
|
|
|
|
/* extern int __CFConstantStringClassReference[]; */
|
|
cfstring_class_reference = build_decl (BUILTINS_LOCATION, VAR_DECL,
|
|
get_identifier ("__CFConstantStringClassReference"),
|
|
build_array_type (integer_type_node, NULL_TREE));
|
|
|
|
TREE_PUBLIC (cfstring_class_reference) = 1;
|
|
DECL_ARTIFICIAL (cfstring_class_reference) = 1;
|
|
(*lang_hooks.decls.pushdecl) (cfstring_class_reference);
|
|
DECL_EXTERNAL (cfstring_class_reference) = 1;
|
|
rest_of_decl_compilation (cfstring_class_reference, 0, 0);
|
|
|
|
/* Initialize the hash table used to hold the constant CFString objects. */
|
|
cfstring_htab = hash_table<cfstring_hasher>::create_ggc (31);
|
|
|
|
return cfstring_type_node;
|
|
}
|
|
|
|
tree
|
|
darwin_fold_builtin (tree fndecl, int n_args, tree *argp,
|
|
bool ARG_UNUSED (ignore))
|
|
{
|
|
unsigned int fcode = DECL_MD_FUNCTION_CODE (fndecl);
|
|
|
|
if (fcode == darwin_builtin_cfstring)
|
|
{
|
|
if (!darwin_constant_cfstrings)
|
|
{
|
|
error ("built-in function %qD requires the"
|
|
" %<-mconstant-cfstrings%> flag", fndecl);
|
|
return error_mark_node;
|
|
}
|
|
|
|
if (n_args != 1)
|
|
{
|
|
error ("built-in function %qD takes one argument only", fndecl);
|
|
return error_mark_node;
|
|
}
|
|
|
|
return darwin_build_constant_cfstring (*argp);
|
|
}
|
|
|
|
return NULL_TREE;
|
|
}
|
|
|
|
void
|
|
darwin_rename_builtins (void)
|
|
{
|
|
}
|
|
|
|
bool
|
|
darwin_libc_has_function (enum function_class fn_class,
|
|
tree type ATTRIBUTE_UNUSED)
|
|
{
|
|
if (fn_class == function_sincos)
|
|
return (strverscmp (darwin_macosx_version_min, "10.9") >= 0);
|
|
|
|
if (fn_class == function_c99_math_complex
|
|
|| fn_class == function_c99_misc)
|
|
return (TARGET_64BIT
|
|
|| strverscmp (darwin_macosx_version_min, "10.3") >= 0);
|
|
|
|
return true;
|
|
}
|
|
|
|
hashval_t
|
|
cfstring_hasher::hash (cfstring_descriptor *ptr)
|
|
{
|
|
tree str = ptr->literal;
|
|
const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str);
|
|
int i, len = TREE_STRING_LENGTH (str);
|
|
hashval_t h = len;
|
|
|
|
for (i = 0; i < len; i++)
|
|
h = ((h * 613) + p[i]);
|
|
|
|
return h;
|
|
}
|
|
|
|
bool
|
|
cfstring_hasher::equal (cfstring_descriptor *ptr1, cfstring_descriptor *ptr2)
|
|
{
|
|
tree str1 = ptr1->literal;
|
|
tree str2 = ptr2->literal;
|
|
int len1 = TREE_STRING_LENGTH (str1);
|
|
|
|
return (len1 == TREE_STRING_LENGTH (str2)
|
|
&& !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2),
|
|
len1));
|
|
}
|
|
|
|
tree
|
|
darwin_build_constant_cfstring (tree str)
|
|
{
|
|
struct cfstring_descriptor *desc, key;
|
|
tree addr;
|
|
|
|
if (!str)
|
|
{
|
|
error ("CFString literal is missing");
|
|
return error_mark_node;
|
|
}
|
|
|
|
STRIP_NOPS (str);
|
|
|
|
if (TREE_CODE (str) == ADDR_EXPR)
|
|
str = TREE_OPERAND (str, 0);
|
|
|
|
if (TREE_CODE (str) != STRING_CST)
|
|
{
|
|
error ("CFString literal expression is not a string constant");
|
|
return error_mark_node;
|
|
}
|
|
|
|
/* Perhaps we already constructed a constant CFString just like this one? */
|
|
key.literal = str;
|
|
cfstring_descriptor **loc = cfstring_htab->find_slot (&key, INSERT);
|
|
desc = *loc;
|
|
|
|
if (!desc)
|
|
{
|
|
tree var, constructor, field;
|
|
vec<constructor_elt, va_gc> *v = NULL;
|
|
int length = TREE_STRING_LENGTH (str) - 1;
|
|
|
|
if (darwin_warn_nonportable_cfstrings)
|
|
{
|
|
const char *s = TREE_STRING_POINTER (str);
|
|
int l = 0;
|
|
|
|
for (l = 0; l < length; l++)
|
|
if (!s[l] || !isascii (s[l]))
|
|
{
|
|
warning (darwin_warn_nonportable_cfstrings,
|
|
s[l] ? G_("non-ASCII character in CFString literal")
|
|
: G_("embedded NUL in CFString literal"));
|
|
break;
|
|
}
|
|
}
|
|
|
|
*loc = desc = ggc_cleared_alloc<cfstring_descriptor> ();
|
|
desc->literal = str;
|
|
|
|
/* isa *. */
|
|
field = TYPE_FIELDS (ccfstring_type_node);
|
|
CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
|
|
build1 (ADDR_EXPR, TREE_TYPE (field),
|
|
cfstring_class_reference));
|
|
/* flags */
|
|
field = DECL_CHAIN (field);
|
|
CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
|
|
build_int_cst (TREE_TYPE (field), 0x000007c8));
|
|
/* string *. */
|
|
field = DECL_CHAIN (field);
|
|
CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
|
|
build1 (ADDR_EXPR, TREE_TYPE (field), str));
|
|
/* length */
|
|
field = DECL_CHAIN (field);
|
|
CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
|
|
build_int_cst (TREE_TYPE (field), length));
|
|
|
|
constructor = build_constructor (ccfstring_type_node, v);
|
|
TREE_READONLY (constructor) = 1;
|
|
TREE_CONSTANT (constructor) = 1;
|
|
TREE_STATIC (constructor) = 1;
|
|
|
|
/* Fromage: The C++ flavor of 'build_unary_op' expects constructor nodes
|
|
to have the TREE_HAS_CONSTRUCTOR (...) bit set. However, this file is
|
|
being built without any knowledge of C++ tree accessors; hence, we shall
|
|
use the generic accessor that TREE_HAS_CONSTRUCTOR actually maps to! */
|
|
if (darwin_running_cxx)
|
|
TREE_LANG_FLAG_4 (constructor) = 1; /* TREE_HAS_CONSTRUCTOR */
|
|
|
|
/* Create an anonymous global variable for this CFString. */
|
|
var = build_decl (input_location, CONST_DECL,
|
|
NULL, TREE_TYPE (constructor));
|
|
DECL_ARTIFICIAL (var) = 1;
|
|
TREE_STATIC (var) = 1;
|
|
DECL_INITIAL (var) = constructor;
|
|
/* FIXME: This should use a translation_unit_decl to indicate file scope. */
|
|
DECL_CONTEXT (var) = NULL_TREE;
|
|
desc->constructor = var;
|
|
}
|
|
|
|
addr = build1 (ADDR_EXPR, pccfstring_type_node, desc->constructor);
|
|
TREE_CONSTANT (addr) = 1;
|
|
|
|
return addr;
|
|
}
|
|
|
|
bool
|
|
darwin_cfstring_p (tree str)
|
|
{
|
|
struct cfstring_descriptor key;
|
|
|
|
if (!str)
|
|
return false;
|
|
|
|
STRIP_NOPS (str);
|
|
|
|
if (TREE_CODE (str) == ADDR_EXPR)
|
|
str = TREE_OPERAND (str, 0);
|
|
|
|
if (TREE_CODE (str) != STRING_CST)
|
|
return false;
|
|
|
|
key.literal = str;
|
|
cfstring_descriptor **loc = cfstring_htab->find_slot (&key, NO_INSERT);
|
|
|
|
if (loc)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
darwin_enter_string_into_cfstring_table (tree str)
|
|
{
|
|
struct cfstring_descriptor key;
|
|
|
|
key.literal = str;
|
|
cfstring_descriptor **loc = cfstring_htab->find_slot (&key, INSERT);
|
|
|
|
if (!*loc)
|
|
{
|
|
*loc = ggc_cleared_alloc<cfstring_descriptor> ();
|
|
((struct cfstring_descriptor *)*loc)->literal = str;
|
|
}
|
|
}
|
|
|
|
/* Choose named function section based on its frequency. */
|
|
|
|
section *
|
|
darwin_function_section (tree decl, enum node_frequency freq,
|
|
bool startup, bool exit)
|
|
{
|
|
/* Decide if we need to put this in a coalescable section. */
|
|
bool weak = (decl
|
|
&& DECL_WEAK (decl)
|
|
&& (!DECL_ATTRIBUTES (decl)
|
|
|| !lookup_attribute ("weak_import",
|
|
DECL_ATTRIBUTES (decl))));
|
|
|
|
bool use_coal = weak && ld_uses_coal_sects;
|
|
/* If there is a specified section name, we should not be trying to
|
|
override. */
|
|
if (decl && DECL_SECTION_NAME (decl) != NULL)
|
|
return get_named_section (decl, NULL, 0);
|
|
|
|
/* We always put unlikely executed stuff in the cold section. */
|
|
if (freq == NODE_FREQUENCY_UNLIKELY_EXECUTED)
|
|
return (use_coal) ? darwin_sections[text_cold_coal_section]
|
|
: darwin_sections[text_cold_section];
|
|
|
|
/* If we have LTO *and* feedback information, then let LTO handle
|
|
the function ordering, it makes a better job (for normal, hot,
|
|
startup and exit - hence the bailout for cold above). */
|
|
if (in_lto_p && flag_profile_values)
|
|
goto default_function_sections;
|
|
|
|
/* Non-cold startup code should go to startup subsection. */
|
|
if (startup)
|
|
return (use_coal) ? darwin_sections[text_startup_coal_section]
|
|
: darwin_sections[text_startup_section];
|
|
|
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/* Similarly for exit. */
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if (exit)
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return (use_coal) ? darwin_sections[text_exit_coal_section]
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: darwin_sections[text_exit_section];
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|
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/* Place hot code. */
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if (freq == NODE_FREQUENCY_HOT)
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return (use_coal) ? darwin_sections[text_hot_coal_section]
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: darwin_sections[text_hot_section];
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|
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/* Otherwise, default to the 'normal' non-reordered sections. */
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default_function_sections:
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return (use_coal) ? darwin_sections[text_coal_section]
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|
: text_section;
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|
}
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#include "gt-darwin.h"
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