diff options
Diffstat (limited to 'gcc-4.8.1/gcc/config/darwin.c')
| -rw-r--r-- | gcc-4.8.1/gcc/config/darwin.c | 3583 |
1 files changed, 0 insertions, 3583 deletions
diff --git a/gcc-4.8.1/gcc/config/darwin.c b/gcc-4.8.1/gcc/config/darwin.c deleted file mode 100644 index a049a5d07..000000000 --- a/gcc-4.8.1/gcc/config/darwin.c +++ /dev/null @@ -1,3583 +0,0 @@ -/* Functions for generic Darwin as target machine for GNU C compiler. - Copyright (C) 1989-2013 Free Software Foundation, Inc. - Contributed by Apple Computer Inc. - -This file is part of GCC. - -GCC is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 3, or (at your option) -any later version. - -GCC is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GCC; see the file COPYING3. If not see -<http://www.gnu.org/licenses/>. */ - -#include "config.h" -#include "system.h" -#include "coretypes.h" -#include "tm.h" -#include "rtl.h" -#include "regs.h" -#include "hard-reg-set.h" -#include "insn-config.h" -#include "conditions.h" -#include "insn-flags.h" -#include "output.h" -#include "insn-attr.h" -#include "flags.h" -#include "tree.h" -#include "expr.h" -#include "reload.h" -#include "function.h" -#include "ggc.h" -#include "langhooks.h" -#include "target.h" -#include "tm_p.h" -#include "diagnostic-core.h" -#include "toplev.h" -#include "hashtab.h" -#include "df.h" -#include "debug.h" -#include "obstack.h" -#include "lto-streamer.h" - -/* Darwin supports a feature called fix-and-continue, which is used - for rapid turn around debugging. When code is compiled with the - -mfix-and-continue flag, two changes are made to the generated code - that allow the system to do things that it would normally not be - able to do easily. These changes allow gdb to load in - recompilation of a translation unit that has been changed into a - running program and replace existing functions and methods of that - translation unit with versions of those functions and methods - from the newly compiled translation unit. The new functions access - the existing static symbols from the old translation unit, if the - symbol existed in the unit to be replaced, and from the new - translation unit, otherwise. - - The changes are to insert 5 nops at the beginning of all functions - and to use indirection to get at static symbols. The 5 nops - are required by consumers of the generated code. Currently, gdb - uses this to patch in a jump to the overriding function, this - allows all uses of the old name to forward to the replacement, - including existing function pointers and virtual methods. See - rs6000_emit_prologue for the code that handles the nop insertions. - - The added indirection allows gdb to redirect accesses to static - symbols from the newly loaded translation unit to the existing - symbol, if any. @code{static} symbols are special and are handled by - setting the second word in the .non_lazy_symbol_pointer data - structure to symbol. See indirect_data for the code that handles - the extra indirection, and machopic_output_indirection and its use - of MACHO_SYMBOL_STATIC for the code that handles @code{static} - symbol indirection. */ - -/* For darwin >= 9 (OSX 10.5) the linker is capable of making the necessary - branch islands and we no longer need to emit darwin stubs. - However, if we are generating code for earlier systems (or for use in the - kernel) the stubs might still be required, and this will be set true. */ -int darwin_emit_branch_islands = false; - -typedef struct GTY(()) cdtor_record { - rtx symbol; - int priority; /* [con/de]structor priority */ - int position; /* original position */ -} cdtor_record; - -static GTY(()) vec<cdtor_record, va_gc> *ctors = NULL; -static GTY(()) vec<cdtor_record, va_gc> *dtors = NULL; - -/* A flag to determine whether we are running c++ or obj-c++. This has to be - settable from non-c-family contexts too (i.e. we can't use the c_dialect_ - functions). */ -int darwin_running_cxx; - -/* Some code-gen now depends on OS major version numbers (at least). */ -int generating_for_darwin_version ; - -/* Section names. */ -section * darwin_sections[NUM_DARWIN_SECTIONS]; - -/* While we transition to using in-tests instead of ifdef'd code. */ -#ifndef HAVE_lo_sum -#define HAVE_lo_sum 0 -#define gen_macho_high(a,b) (a) -#define gen_macho_low(a,b,c) (a) -#endif - -/* True if we're setting __attribute__ ((ms_struct)). */ -int darwin_ms_struct = false; - -/* Earlier versions of Darwin as do not recognize an alignment field in - .comm directives, this should be set for versions that allow it. */ -int emit_aligned_common = false; - -/* A get_unnamed_section callback used to switch to an ObjC section. - DIRECTIVE is as for output_section_asm_op. */ - -static void -output_objc_section_asm_op (const void *directive) -{ - static bool been_here = false; - - /* The NeXT ObjC Runtime requires these sections to be present and in - order in the object. The code below implements this by emitting - a section header for each ObjC section the first time that an ObjC - section is requested. */ - if (! been_here) - { - section *saved_in_section = in_section; - static const enum darwin_section_enum tomark[] = - { - /* written, cold -> hot */ - objc_cat_cls_meth_section, - objc_cat_inst_meth_section, - objc_string_object_section, - objc_constant_string_object_section, - objc_selector_refs_section, - objc_selector_fixup_section, - objc_cls_refs_section, - objc_class_section, - objc_meta_class_section, - /* shared, hot -> cold */ - objc_cls_meth_section, - objc_inst_meth_section, - objc_protocol_section, - objc_class_names_section, - objc_meth_var_types_section, - objc_meth_var_names_section, - objc_category_section, - objc_class_vars_section, - objc_instance_vars_section, - objc_module_info_section, - objc_symbols_section, - }; - /* ABI=1 */ - static const enum darwin_section_enum tomarkv1[] = - { - objc1_protocol_ext_section, - objc1_class_ext_section, - objc1_prop_list_section - } ; - /* ABI=2 */ - static const enum darwin_section_enum tomarkv2[] = - { - objc2_message_refs_section, - objc2_classdefs_section, - objc2_metadata_section, - objc2_classrefs_section, - objc2_classlist_section, - objc2_categorylist_section, - objc2_selector_refs_section, - objc2_nonlazy_class_section, - objc2_nonlazy_category_section, - objc2_protocollist_section, - objc2_protocolrefs_section, - objc2_super_classrefs_section, - objc2_image_info_section, - objc2_constant_string_object_section - } ; - size_t i; - - been_here = true; - if (flag_objc_abi < 2) - { - for (i = 0; i < ARRAY_SIZE (tomark); i++) - switch_to_section (darwin_sections[tomark[i]]); - if (flag_objc_abi == 1) - for (i = 0; i < ARRAY_SIZE (tomarkv1); i++) - switch_to_section (darwin_sections[tomarkv1[i]]); - } - else - for (i = 0; i < ARRAY_SIZE (tomarkv2); i++) - switch_to_section (darwin_sections[tomarkv2[i]]); - /* Make sure we don't get varasm.c out of sync with us. */ - switch_to_section (saved_in_section); - } - output_section_asm_op (directive); -} - - -/* Private flag applied to disable section-anchors in a particular section. */ -#define SECTION_NO_ANCHOR SECTION_MACH_DEP - - -/* Implement TARGET_ASM_INIT_SECTIONS. */ - -void -darwin_init_sections (void) -{ -#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \ - darwin_sections[NAME] = \ - get_unnamed_section (FLAGS, (OBJC \ - ? output_objc_section_asm_op \ - : output_section_asm_op), \ - "\t" DIRECTIVE); -#include "config/darwin-sections.def" -#undef DEF_SECTION - - readonly_data_section = darwin_sections[const_section]; - exception_section = darwin_sections[darwin_exception_section]; - eh_frame_section = darwin_sections[darwin_eh_frame_section]; -} - -int -name_needs_quotes (const char *name) -{ - int c; - while ((c = *name++) != '\0') - if (! ISIDNUM (c) - && c != '.' && c != '$' && c != '_' ) - return 1; - return 0; -} - -/* Return true if SYM_REF can be used without an indirection. */ -int -machopic_symbol_defined_p (rtx sym_ref) -{ - if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED) - return true; - - /* If a symbol references local and is not an extern to this - file, then the symbol might be able to declared as defined. */ - if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref)) - { - /* If the symbol references a variable and the variable is a - common symbol, then this symbol is not defined. */ - if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE) - { - tree decl = SYMBOL_REF_DECL (sym_ref); - if (!decl) - return true; - if (DECL_COMMON (decl)) - return false; - } - return true; - } - return false; -} - -/* This module assumes that (const (symbol_ref "foo")) is a legal pic - reference, which will not be changed. */ - -enum machopic_addr_class -machopic_classify_symbol (rtx sym_ref) -{ - bool function_p; - - function_p = SYMBOL_REF_FUNCTION_P (sym_ref); - if (machopic_symbol_defined_p (sym_ref)) - return (function_p - ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA); - else - return (function_p - ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA); -} - -#ifndef TARGET_FIX_AND_CONTINUE -#define TARGET_FIX_AND_CONTINUE 0 -#endif - -/* Indicate when fix-and-continue style code generation is being used - and when a reference to data should be indirected so that it can be - rebound in a new translation unit to reference the original instance - of that data. Symbol names that are for code generation local to - the translation unit are bound to the new translation unit; - currently this means symbols that begin with L or _OBJC_; - otherwise, we indicate that an indirect reference should be made to - permit the runtime to rebind new instances of the translation unit - to the original instance of the data. */ - -static int -indirect_data (rtx sym_ref) -{ - int lprefix; - const char *name; - - /* If we aren't generating fix-and-continue code, don't do anything - special. */ - if (TARGET_FIX_AND_CONTINUE == 0) - return 0; - - /* Otherwise, all symbol except symbols that begin with L or _OBJC_ - are indirected. Symbols that begin with L and _OBJC_ are always - bound to the current translation unit as they are used for - generated local data of the translation unit. */ - - name = XSTR (sym_ref, 0); - - lprefix = (((name[0] == '*' || name[0] == '&') - && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L'))) - || (strncmp (name, "_OBJC_", 6) == 0)); - - return ! lprefix; -} - -static int -machopic_data_defined_p (rtx sym_ref) -{ - if (indirect_data (sym_ref)) - return 0; - - switch (machopic_classify_symbol (sym_ref)) - { - case MACHOPIC_DEFINED_DATA: - case MACHOPIC_DEFINED_FUNCTION: - return 1; - default: - return 0; - } -} - -void -machopic_define_symbol (rtx mem) -{ - rtx sym_ref; - - gcc_assert (GET_CODE (mem) == MEM); - sym_ref = XEXP (mem, 0); - SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; -} - -/* Return either ORIG or: - - (const:P (unspec:P [ORIG] UNSPEC_MACHOPIC_OFFSET)) - - depending on MACHO_DYNAMIC_NO_PIC_P. */ -rtx -machopic_gen_offset (rtx orig) -{ - if (MACHO_DYNAMIC_NO_PIC_P) - return orig; - else - { - /* Play games to avoid marking the function as needing pic if we - are being called as part of the cost-estimation process. */ - if (current_ir_type () != IR_GIMPLE || currently_expanding_to_rtl) - crtl->uses_pic_offset_table = 1; - orig = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, orig), - UNSPEC_MACHOPIC_OFFSET); - return gen_rtx_CONST (Pmode, orig); - } -} - -static GTY(()) const char * function_base_func_name; -static GTY(()) int current_pic_label_num; - -void -machopic_output_function_base_name (FILE *file) -{ - const char *current_name; - - /* If dynamic-no-pic is on, we should not get here. */ - gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); - /* When we are generating _get_pc thunks within stubs, there is no current - function. */ - if (current_function_decl) - { - current_name = - IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); - if (function_base_func_name != current_name) - { - ++current_pic_label_num; - function_base_func_name = current_name; - } - } - else - { - ++current_pic_label_num; - function_base_func_name = "L_machopic_stub_dummy"; - } - fprintf (file, "L%011d$pb", current_pic_label_num); -} - -/* The suffix attached to non-lazy pointer symbols. */ -#define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr" -/* The suffix attached to stub symbols. */ -#define STUB_SUFFIX "$stub" - -typedef struct GTY (()) machopic_indirection -{ - /* The SYMBOL_REF for the entity referenced. */ - rtx symbol; - /* The name of the stub or non-lazy pointer. */ - const char * ptr_name; - /* True iff this entry is for a stub (as opposed to a non-lazy - pointer). */ - bool stub_p; - /* True iff this stub or pointer pointer has been referenced. */ - bool used; -} machopic_indirection; - -/* A table mapping stub names and non-lazy pointer names to - SYMBOL_REFs for the stubbed-to and pointed-to entities. */ - -static GTY ((param_is (struct machopic_indirection))) htab_t - machopic_indirections; - -/* Return a hash value for a SLOT in the indirections hash table. */ - -static hashval_t -machopic_indirection_hash (const void *slot) -{ - const machopic_indirection *p = (const machopic_indirection *) slot; - return htab_hash_string (p->ptr_name); -} - -/* Returns true if the KEY is the same as that associated with - SLOT. */ - -static int -machopic_indirection_eq (const void *slot, const void *key) -{ - return strcmp (((const machopic_indirection *) slot)->ptr_name, - (const char *) key) == 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. */ - -const char * -machopic_indirection_name (rtx sym_ref, bool stub_p) -{ - char *buffer; - const char *name = XSTR (sym_ref, 0); - size_t namelen = strlen (name); - machopic_indirection *p; - void ** slot; - bool needs_quotes; - const char *suffix; - const char *prefix = user_label_prefix; - const char *quote = ""; - tree id; - - 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); - namelen = strlen (name); - } - } - - if (name[0] == '*') - { - prefix = ""; - ++name; - --namelen; - } - - needs_quotes = name_needs_quotes (name); - if (needs_quotes) - { - quote = "\""; - } - - if (stub_p) - suffix = STUB_SUFFIX; - else - suffix = NON_LAZY_POINTER_SUFFIX; - - buffer = XALLOCAVEC (char, strlen ("&L") - + strlen (prefix) - + namelen - + strlen (suffix) - + 2 * strlen (quote) - + 1 /* '\0' */); - - /* Construct the name of the non-lazy pointer or stub. */ - sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote); - - if (!machopic_indirections) - machopic_indirections = htab_create_ggc (37, - machopic_indirection_hash, - machopic_indirection_eq, - /*htab_del=*/NULL); - - slot = htab_find_slot_with_hash (machopic_indirections, buffer, - htab_hash_string (buffer), INSERT); - if (*slot) - { - p = (machopic_indirection *) *slot; - } - else - { - p = ggc_alloc_machopic_indirection (); - p->symbol = sym_ref; - p->ptr_name = xstrdup (buffer); - p->stub_p = stub_p; - p->used = false; - *slot = p; - } - - return p->ptr_name; -} - -/* Return the name of the stub for the mcount function. */ - -const char* -machopic_mcount_stub_name (void) -{ - rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount"); - return machopic_indirection_name (symbol, /*stub_p=*/true); -} - -/* 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; - - p = ((machopic_indirection *) - (htab_find_with_hash (machopic_indirections, 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 (hi_reg, orig)); - emit_insn (gen_macho_low (reg, hi_reg, orig)); - return reg; - } - else if (DARWIN_X86) - return orig; - else - /* some other cpu -- writeme! */ - gcc_unreachable (); - } - else if (defined) - { - 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 (Pmode, hi_sum_reg, - gen_rtx_PLUS (Pmode, pic_offset_table_rtx, - gen_rtx_HIGH (Pmode, offset)))); - emit_insn (gen_rtx_SET (Pmode, 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 (VOIDmode, reg, - gen_rtx_HIGH (Pmode, offset))); - emit_insn (gen_rtx_SET (VOIDmode, 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); - - 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 (Pmode, 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; - /* When the target is i386, this code prevents crashes due to the - compiler's ignorance on how to move the PIC base register to - other registers. (The reload phase sometimes introduces such - insns.) */ - if (GET_CODE (XEXP (orig, 0)) == REG - && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM - /* Prevent the same register from being erroneously used - as both the base and index registers. */ - && (DARWIN_X86 && (GET_CODE (XEXP (orig, 1)) == CONST)) - && reg) - { - emit_move_insn (reg, XEXP (orig, 0)); - XEXP (ptr_ref, 0) = reg; - return ptr_ref; - } - - /* 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_emit_branch_islands) - return target; - - if (GET_CODE (target) != MEM) - return target; - - if (MACHOPIC_INDIRECT - && GET_CODE (XEXP (target, 0)) == SYMBOL_REF - && !(SYMBOL_REF_FLAGS (XEXP (target, 0)) - & MACHO_SYMBOL_FLAG_DEFINED)) - { - rtx sym_ref = XEXP (target, 0); - const char *stub_name = machopic_indirection_name (sym_ref, - /*stub_p=*/true); - enum 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); - MEM_READONLY_P (target) = 1; - MEM_NOTRAP_P (target) = 1; - } - - return target; -} - -rtx -machopic_legitimize_pic_address (rtx orig, enum 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 (!reload_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 (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 (VOIDmode, 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 insn; - 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 (Pmode, hi_sum_reg, sum)); - - mem = gen_const_mem (GET_MODE (orig), - gen_rtx_LO_SUM (Pmode, - hi_sum_reg, - copy_rtx (offset))); - insn = emit_insn (gen_rtx_SET (VOIDmode, 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 (VOIDmode, reg, - gen_rtx_HIGH (Pmode, - gen_rtx_CONST (Pmode, - offset)))); - emit_insn (gen_rtx_SET (VOIDmode, 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 0 - emit_use (gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM)); -#endif - - if (reload_in_progress) - 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 (!reload_in_progress); - reg = gen_reg_rtx (Pmode); - } - - hi_sum_reg = reg; - - emit_insn (gen_rtx_SET (Pmode, 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 (VOIDmode, reg, - gen_rtx_LO_SUM (Pmode, - hi_sum_reg, - copy_rtx (offset)))); - pic_ref = reg; -#else - emit_insn (gen_rtx_SET (VOIDmode, reg, - gen_rtx_HIGH (Pmode, offset))); - emit_insn (gen_rtx_SET (VOIDmode, 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 0 - emit_use (pic_offset_table_rtx); -#endif - if (reload_in_progress) - 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) == SYMBOL_REF) - return orig; - - 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; -} - -/* Output the stub or non-lazy pointer in *SLOT, if it has been used. - DATA is the FILE* for assembly output. Called from - htab_traverse. */ - -static int -machopic_output_indirection (void **slot, void *data) -{ - machopic_indirection *p = *((machopic_indirection **) slot); - FILE *asm_out_file = (FILE *) data; - rtx symbol; - const char *sym_name; - const char *ptr_name; - - if (!p->used) - return 1; - - symbol = p->symbol; - sym_name = XSTR (symbol, 0); - ptr_name = p->ptr_name; - - if (p->stub_p) - { - char *sym; - char *stub; - tree id; - - 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); - } - - 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); - - 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); - } - else if (! indirect_data (symbol) - && (machopic_symbol_defined_p (symbol) - || SYMBOL_REF_LOCAL_P (symbol))) - { - 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); - } - else - { - rtx init = const0_rtx; - - 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_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_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. */ - - if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC) - && 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; -} - -void -machopic_finish (FILE *asm_out_file) -{ - if (machopic_indirections) - htab_traverse_noresize (machopic_indirections, - 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 records whether a given name corresponds to a defined - or undefined function or variable, for machopic_classify_ident to - use later. */ - -void -darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED) -{ - rtx sym_ref; - - /* Do the standard encoding things first. */ - default_encode_section_info (decl, rtl, first); - - if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL) - return; - - sym_ref = XEXP (rtl, 0); - if (TREE_CODE (decl) == VAR_DECL) - SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE; - - 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_STATIC; -} - -void -darwin_mark_decl_preserved (const char *name) -{ - 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 weak, bool zsize) -{ - return (weak - ? darwin_sections[const_coal_section] - : (zsize ? darwin_sections[zobj_const_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) -{ - enum machine_mode mode = DECL_MODE (exp); - unsigned int modesize = GET_MODE_BITSIZE (mode); - - if (DARWIN_SECTION_ANCHORS - && flag_section_anchors - && zsize) - return darwin_sections[zobj_const_section]; - - if (flag_merge_constants - && mode != VOIDmode - && mode != BLKmode - && modesize <= align - && align >= 8 - && align <= 256 - && (align & (align -1)) == 0) - { - tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp)); - - if (TREE_CODE (size) == INTEGER_CST - && TREE_INT_CST_LOW (size) == 4 - && TREE_INT_CST_HIGH (size) == 0) - return darwin_sections[literal4_section]; - else if (TREE_CODE (size) == INTEGER_CST - && TREE_INT_CST_LOW (size) == 8 - && TREE_INT_CST_HIGH (size) == 0) - return darwin_sections[literal8_section]; - else if (HAVE_GAS_LITERAL16 - && TARGET_64BIT - && TREE_CODE (size) == INTEGER_CST - && TREE_INT_CST_LOW (size) == 16 - && TREE_INT_CST_HIGH (size) == 0) - return darwin_sections[literal16_section]; - else - return readonly_data_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; -} - -/* 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); - - /* If we are in LTO, then we don't know the state of flag_next_runtime - or flag_objc_abi when the code was generated. We set these from the - meta-data - which is needed to deal with const string constructors. */ - - flag_next_runtime = 1; - flag_objc_abi = 2; - - 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_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_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)) - 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 darwin_sections[data_coal_section]; - - else if (!strncmp (p, "V2_CSTR", 7)) - return darwin_sections[objc2_constant_string_object_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); - - /* If we are in LTO, then we don't know the state of flag_next_runtime - or flag_objc_abi when the code was generated. We set these from the - meta-data - which is needed to deal with const string constructors. */ - flag_next_runtime = 1; - if (!global_options_set.x_flag_objc_abi) - flag_objc_abi = 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)) - 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, ro; - section *base_section = NULL; - - weak = (DECL_P (decl) - && DECL_WEAK (decl) - && !lookup_attribute ("weak_import", DECL_ATTRIBUTES (decl))); - - zsize = (DECL_P (decl) - && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL) - && tree_low_cst (DECL_SIZE_UNIT (decl), 1) == 0); - - one = DECL_P (decl) - && TREE_CODE (decl) == VAR_DECL - && DECL_ONE_ONLY (decl); - - 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 (weak, zsize); - 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 (weak || one) - { - if (ro) - base_section = darwin_sections[const_data_coal_section]; - else - base_section = darwin_sections[data_coal_section]; - } - else if (DARWIN_SECTION_ANCHORS - && flag_section_anchors - && 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. This does not need to be done - for stuff in mergeable sections, since these are ineligible for - anchors. */ - 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 (weak || one) - 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); - - /* FIXME: This is unsatisfactory for LTO, since it relies on other - metadata determining the source FE. */ - 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; - } - /* c) legacy meta-data selection. */ - else if (TREE_CODE (decl) == VAR_DECL - && DECL_NAME (decl) - && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE - && IDENTIFIER_POINTER (DECL_NAME (decl)) - && flag_next_runtime - && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6)) - { - const char *name = IDENTIFIER_POINTER (DECL_NAME (decl)); - static bool warned_objc_46 = false; - /* We shall assert that zero-sized objects are an error in ObjC - meta-data. */ - gcc_assert (tree_low_cst (DECL_SIZE_UNIT (decl), 1) != 0); - - /* ??? This mechanism for determining the metadata section is - broken when LTO is in use, since the frontend that generated - the data is not identified. We will keep the capability for - the short term - in case any non-Objective-C programs are using - it to place data in specified sections. */ - if (!warned_objc_46) - { - location_t loc = DECL_SOURCE_LOCATION (decl); - warning_at (loc, 0, "the use of _OBJC_-prefixed variable names" - " to select meta-data sections is deprecated at 4.6" - " and will be removed in 4.7"); - warned_objc_46 = true; - } - - if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20)) - return darwin_sections[objc_cls_meth_section]; - else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23)) - return darwin_sections[objc_inst_meth_section]; - else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 29)) - return darwin_sections[objc_cat_cls_meth_section]; - else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 32)) - return darwin_sections[objc_cat_inst_meth_section]; - else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22)) - return darwin_sections[objc_class_vars_section]; - else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25)) - return darwin_sections[objc_instance_vars_section]; - else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22)) - return darwin_sections[objc_cat_cls_meth_section]; - else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17)) - return darwin_sections[objc_class_names_section]; - else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20)) - return darwin_sections[objc_meth_var_names_section]; - else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20)) - return darwin_sections[objc_meth_var_types_section]; - else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22)) - return darwin_sections[objc_cls_refs_section]; - else if (!strncmp (name, "_OBJC_CLASS_", 12)) - return darwin_sections[objc_class_section]; - else if (!strncmp (name, "_OBJC_METACLASS_", 16)) - return darwin_sections[objc_meta_class_section]; - else if (!strncmp (name, "_OBJC_CATEGORY_", 15)) - return darwin_sections[objc_category_section]; - else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25)) - return darwin_sections[objc_selector_refs_section]; - else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20)) - return darwin_sections[objc_selector_fixup_section]; - else if (!strncmp (name, "_OBJC_SYMBOLS", 13)) - return darwin_sections[objc_symbols_section]; - else if (!strncmp (name, "_OBJC_MODULES", 13)) - return darwin_sections[objc_module_info_section]; - else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16)) - return darwin_sections[objc_image_info_section]; - else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) - return darwin_sections[objc_cat_inst_meth_section]; - else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) - return darwin_sections[objc_cat_cls_meth_section]; - else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20)) - return darwin_sections[objc_cat_cls_meth_section]; - else if (!strncmp (name, "_OBJC_PROTOCOL_", 15)) - return darwin_sections[objc_protocol_section]; - else - return base_section; - } - - return base_section; -} - -/* This can be called with address expressions as "rtx". - They must go in "const". */ - -section * -machopic_select_rtx_section (enum machine_mode mode, rtx x, - unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) -{ - if (GET_MODE_SIZE (mode) == 8 - && (GET_CODE (x) == CONST_INT - || GET_CODE (x) == CONST_DOUBLE)) - return darwin_sections[literal8_section]; - else if (GET_MODE_SIZE (mode) == 4 - && (GET_CODE (x) == CONST_INT - || GET_CODE (x) == CONST_DOUBLE)) - return darwin_sections[literal4_section]; - else if (HAVE_GAS_LITERAL16 - && TARGET_64BIT - && GET_MODE_SIZE (mode) == 16 - && (GET_CODE (x) == CONST_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]); - - 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]); - - 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); -} - -/* 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++; - } - return (!strncmp ((const char *)p, "_OBJC_", 6)); -} - -/* 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; - -/* Segment for LTO data. */ -#define LTO_SEGMENT_NAME "__GNU_LTO" - -/* 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; - -/* 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; - 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 ("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; -} - -static void -darwin_asm_dwarf_section (const char *name, unsigned int flags, tree decl); - -/* 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); - 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; - - /* We use the linker to emit the .eh labels for Darwin 9 and above. */ - if (! for_eh || generating_for_darwin_version >= 9) - return; - - /* FIXME: This only works when the eh for all sections of a function is - 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); -} -/* 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_low_cst (DECL_SIZE_UNIT (decl), 1); - -#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, - unsigned int align) -{ - /* Since the sections used here are coalesed, they will not be eligible - for section anchors, and therefore we don't need to break that out. */ - if (TREE_READONLY (decl) || TREE_CONSTANT (decl)) - switch_to_section (darwin_sections[const_data_coal_section]); - else - switch_to_section (darwin_sections[data_coal_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) -{ - /* FIXME: We have a fudge to make this work with Java even when the target does - not use sections anchors -- Java seems to need at least one small item in a - non-zerofill segment. */ - if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL) - || (size && size <= 2)) - { - /* 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, 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]; - unsigned int flags ; - snprintf (secnam, 64, "__DATA,__%sbss%u", ((size)?"":"zo_"), - (unsigned) l2align); - /* We can't anchor (yet, if ever) in zerofill sections, because we can't - switch to them and emit a label. */ - 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"\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); - gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT); - - 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, - 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 (small item fudge for Java, see above). */ - if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL) - || (size && size <= 2)) - { - /* 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 - { - char secnam[64]; - unsigned int flags ; - /* When we are on a non-section anchor target, 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. */ - snprintf (secnam, 64, "__DATA,__%spu_bss%u", ((size)?"":"zo_"), l2align); - - /* We can't anchor in zerofill sections, because we can't switch - to them and emit a label. */ - 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, l2align); - else - fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED"\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 - 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_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, - 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_assert (l2align <= L2_MAX_OFILE_ALIGNMENT); - - if (TREE_PUBLIC (decl) != 0) - 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, - 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)) -{ - unsigned i; - int namelen; - const char * sname; - dwarf_sect_used_entry *ref; - bool found = false; - gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED)) - == (SECTION_DEBUG | SECTION_NAMED)); - /* We know that the name starts with __DWARF, */ - sname = name + 8; - namelen = strchr (sname, ',') - sname; - gcc_assert (namelen); - 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; - } - } - - fprintf (asm_out_file, "\t.section %s\n", name); - 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) -{ - 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 (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, - section *base) -{ - char sname[64]; - int namelen; - - gcc_assert (base->common.flags & SECTION_NAMED); - gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0); - gcc_assert (strchr (base->named.name + 8, ',')); - - namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8); - sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8); - darwin_asm_output_dwarf_delta (file, size, lab, sname); -} - -/* 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 (); - machopic_finish (asm_out_file); - if (strcmp (lang_hooks.name, "GNU C++") == 0) - { - 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 ("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"); -} - -/* 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) -{ - return default_binds_local_p_1 (decl, - TARGET_KEXTABI && DARWIN_VTABLE_P (decl)); -} - -/* 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, "10.6") >= 0) - generating_for_darwin_version = 10; - else if (strverscmp (darwin_macosx_version_min, "10.5") >= 0) - generating_for_darwin_version = 9; - - /* Earlier versions are not specifically accounted, until required. */ - } - - /* 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). */ - - /* 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); - - /* Objective-C family ABI 2 is only valid for next/m64 at present. */ - if (global_options_set.x_flag_objc_abi && flag_next_runtime) - { - if (TARGET_64BIT && global_options.x_flag_objc_abi < 2) - error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 must be" - " used for %<-m64%> targets with" - " %<-fnext-runtime%>"); - if (!TARGET_64BIT && global_options.x_flag_objc_abi >= 2) - error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 is not" - " supported on %<-m32%> targets with" - " %<-fnext-runtime%>"); - } - - /* 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; - - /* 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 (strcmp (lang_hooks.name, "GNU C++") == 0) - 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; - /* We still need to emit branch islands for kernel context. */ - darwin_emit_branch_islands = true; - } - - 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; - - 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) - { - /* Darwin's -fpic is -fPIC. */ - flag_pic = 2; - } - - /* It is assumed that branch island stubs are needed for earlier systems. */ - if (generating_for_darwin_version < 9) - darwin_emit_branch_islands = true; - else - emit_aligned_common = true; /* Later systems can support aligned common. */ - - /* 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 (()) cfstring_descriptor { - /* The string literal. */ - tree literal; - /* The resulting constant CFString. */ - tree constructor; -} cfstring_descriptor; - -static GTY ((param_is (struct cfstring_descriptor))) htab_t cfstring_htab; - -static hashval_t cfstring_hash (const void *); -static int cfstring_eq (const void *, const void *); - -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); - DECL_BUILT_IN_CLASS (cfsfun) = BUILT_IN_MD; - DECL_FUNCTION_CODE (cfsfun) = 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 = htab_create_ggc (31, cfstring_hash, cfstring_eq, NULL); - - return cfstring_type_node; -} - -tree -darwin_fold_builtin (tree fndecl, int n_args, tree *argp, - bool ARG_UNUSED (ignore)) -{ - unsigned int fcode = DECL_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) -{ - /* The system ___divdc3 routine in libSystem on darwin10 is not - accurate to 1ulp, ours is, so we avoid ever using the system name - for this routine and instead install a non-conflicting name that - is accurate. - - When -ffast-math or -funsafe-math-optimizations is given, we can - use the faster version. */ - if (!flag_unsafe_math_optimizations) - { - enum built_in_function dcode - = (enum built_in_function)(BUILT_IN_COMPLEX_DIV_MIN - + DCmode - MIN_MODE_COMPLEX_FLOAT); - tree fn = builtin_decl_explicit (dcode); - /* Fortran and c call TARGET_INIT_BUILTINS and - TARGET_INIT_LIBFUNCS at different times, so we have to put a - call into each to ensure that at least one of them is called - after build_common_builtin_nodes. A better fix is to add a - new hook to run after build_common_builtin_nodes runs. */ - if (fn) - set_user_assembler_name (fn, "___ieee_divdc3"); - fn = builtin_decl_implicit (dcode); - if (fn) - set_user_assembler_name (fn, "___ieee_divdc3"); - } -} - -static hashval_t -cfstring_hash (const void *ptr) -{ - tree str = ((const struct cfstring_descriptor *)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; -} - -static int -cfstring_eq (const void *ptr1, const void *ptr2) -{ - tree str1 = ((const struct cfstring_descriptor *)ptr1)->literal; - tree str2 = ((const struct cfstring_descriptor *)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; - void **loc; - 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; - loc = htab_find_slot (cfstring_htab, &key, INSERT); - desc = (struct cfstring_descriptor *) *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 in CFString literal", - s[l] ? "non-ASCII character" : "embedded NUL"); - break; - } - } - - *loc = desc = ggc_alloc_cleared_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; - void **loc; - - 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; - loc = htab_find_slot (cfstring_htab, &key, NO_INSERT); - - if (loc) - return true; - - return false; -} - -void -darwin_enter_string_into_cfstring_table (tree str) -{ - struct cfstring_descriptor key; - void **loc; - - key.literal = str; - loc = htab_find_slot (cfstring_htab, &key, INSERT); - - if (!*loc) - { - *loc = ggc_alloc_cleared_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)))); - - /* If there is a specified section name, we should not be trying to - override. */ - if (decl && DECL_SECTION_NAME (decl) != NULL_TREE) - return get_named_section (decl, NULL, 0); - - /* Default when there is no function re-ordering. */ - if (!flag_reorder_functions) - return (weak) - ? darwin_sections[text_coal_section] - : text_section; - - /* Startup code should go to startup subsection unless it is - unlikely executed (this happens especially with function splitting - where we can split away unnecessary parts of static constructors). */ - if (startup && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED) - return (weak) - ? darwin_sections[text_startup_coal_section] - : darwin_sections[text_startup_section]; - - /* Similarly for exit. */ - if (exit && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED) - return (weak) - ? darwin_sections[text_exit_coal_section] - : darwin_sections[text_exit_section]; - - /* Group cold functions together, similarly for hot code. */ - switch (freq) - { - case NODE_FREQUENCY_UNLIKELY_EXECUTED: - return (weak) - ? darwin_sections[text_cold_coal_section] - : darwin_sections[text_cold_section]; - break; - case NODE_FREQUENCY_HOT: - return (weak) - ? darwin_sections[text_hot_coal_section] - : darwin_sections[text_hot_section]; - break; - default: - return (weak) - ? darwin_sections[text_coal_section] - : text_section; - break; - } -} - -/* When a function is partitioned between sections, we need to insert a label - at the start of each new chunk - so that it may become a valid 'atom' for - eh and debug purposes. Without this the linker will emit warnings if one - tries to add line location information (since the switched fragment will - be anonymous). */ - -void -darwin_function_switched_text_sections (FILE *fp, tree decl, bool new_is_cold) -{ - char buf[128]; - snprintf (buf, 128, "%s%s",new_is_cold?"__cold_sect_of_":"__hot_sect_of_", - IDENTIFIER_POINTER (DECL_NAME (decl))); - /* Make sure we pick up all the relevant quotes etc. */ - assemble_name_raw (fp, (const char *) buf); - fputs (":\n", fp); -} - -#include "gt-darwin.h" |