From 1bc5aee63eb72b341f506ad058502cd0361f0d10 Mon Sep 17 00:00:00 2001 From: Ben Cheng Date: Tue, 25 Mar 2014 22:37:19 -0700 Subject: Initial checkin of GCC 4.9.0 from trunk (r208799). Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba --- gcc-4.9/gcc/config/darwin.c | 3663 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 3663 insertions(+) create mode 100644 gcc-4.9/gcc/config/darwin.c (limited to 'gcc-4.9/gcc/config/darwin.c') diff --git a/gcc-4.9/gcc/config/darwin.c b/gcc-4.9/gcc/config/darwin.c new file mode 100644 index 000000000..adf370d4d --- /dev/null +++ b/gcc-4.9/gcc/config/darwin.c @@ -0,0 +1,3663 @@ +/* Functions for generic Darwin as target machine for GNU C compiler. + Copyright (C) 1989-2014 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 +. */ + +#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 "stringpool.h" +#include "varasm.h" +#include "stor-layout.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 "pointer-set.h" +#include "hash-table.h" +#include "vec.h" +#include "basic-block.h" +#include "tree-ssa-alias.h" +#include "internal-fn.h" +#include "gimple-fold.h" +#include "tree-eh.h" +#include "gimple-expr.h" +#include "is-a.h" +#include "gimple.h" +#include "gimplify.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 *ctors = NULL; +static GTY(()) vec *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; +static GTY(()) int emitted_pic_label_num; + +static void +update_pic_label_number_if_needed (void) +{ + const char *current_name; + + /* 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"; + } +} + +void +machopic_output_function_base_name (FILE *file) +{ + /* If dynamic-no-pic is on, we should not get here. */ + gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); + + update_pic_label_number_if_needed (); + fprintf (file, "L%d$pb", current_pic_label_num); +} + +char curr_picbasename[32]; + +const char * +machopic_get_function_picbase (void) +{ + /* If dynamic-no-pic is on, we should not get here. */ + gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); + + update_pic_label_number_if_needed (); + snprintf (curr_picbasename, 32, "L%d$pb", current_pic_label_num); + return (const char *) curr_picbasename; +} + +bool +machopic_should_output_picbase_label (void) +{ + update_pic_label_number_if_needed (); + + if (current_pic_label_num == emitted_pic_label_num) + return false; + + emitted_pic_label_num = current_pic_label_num; + return true; +} + +/* The suffix attached to non-lazy pointer symbols. */ +#define NON_LAZY_POINTER_SUFFIX "$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; +} + +static int classes_seen; +static int objc_metadata_seen; + +/* Return the section required for Objective C ABI 2 metadata. */ +static section * +darwin_objc2_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base) +{ + const char *p; + tree ident = TREE_VALUE (meta); + gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE); + p = IDENTIFIER_POINTER (ident); + + gcc_checking_assert (flag_next_runtime == 1 && flag_objc_abi == 2); + + objc_metadata_seen = 1; + + if (base == data_section) + base = darwin_sections[objc2_metadata_section]; + + /* Most of the OBJC2 META-data end up in the base section, so check it + first. */ + if (!strncmp (p, "V2_BASE", 7)) + return base; + else if (!strncmp (p, "V2_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)) + { + classes_seen = 1; + return darwin_sections[objc2_classlist_section]; + } + else if (!strncmp (p, "V2_SRFS", 7)) + return darwin_sections[objc2_selector_refs_section]; + else if (!strncmp (p, "V2_NLCA", 7)) + return darwin_sections[objc2_nonlazy_category_section]; + else if (!strncmp (p, "V2_CALA", 7)) + return darwin_sections[objc2_categorylist_section]; + + else if (!strncmp (p, "V2_PLST", 7)) + return darwin_sections[objc2_protocollist_section]; + else if (!strncmp (p, "V2_PRFS", 7)) + return darwin_sections[objc2_protocolrefs_section]; + + else if (!strncmp (p, "V2_INFO", 7)) + return darwin_sections[objc2_image_info_section]; + + else if (!strncmp (p, "V2_EHTY", 7)) + return 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); + + gcc_checking_assert (flag_next_runtime == 1 && flag_objc_abi < 2); + + objc_metadata_seen = 1; + + /* String sections first, cos there are lots of strings. */ + if (!strncmp (p, "V1_STRG", 7)) + return darwin_sections[cstring_section]; + else if (!strncmp (p, "V1_CLSN", 7)) + return darwin_sections[objc_class_names_section]; + else if (!strncmp (p, "V1_METN", 7)) + return darwin_sections[objc_meth_var_names_section]; + else if (!strncmp (p, "V1_METT", 7)) + return darwin_sections[objc_meth_var_types_section]; + + else if (!strncmp (p, "V1_CLAS", 7)) + { + classes_seen = 1; + return darwin_sections[objc_class_section]; + } + else if (!strncmp (p, "V1_META", 7)) + return darwin_sections[objc_meta_class_section]; + else if (!strncmp (p, "V1_CATG", 7)) + return darwin_sections[objc_category_section]; + else if (!strncmp (p, "V1_PROT", 7)) + return darwin_sections[objc_protocol_section]; + + else if (!strncmp (p, "V1_CLCV", 7)) + return darwin_sections[objc_class_vars_section]; + else if (!strncmp (p, "V1_CLIV", 7)) + return darwin_sections[objc_instance_vars_section]; + + else if (!strncmp (p, "V1_CLCM", 7)) + return darwin_sections[objc_cls_meth_section]; + else if (!strncmp (p, "V1_CLIM", 7)) + return darwin_sections[objc_inst_meth_section]; + else if (!strncmp (p, "V1_CACM", 7)) + return darwin_sections[objc_cat_cls_meth_section]; + else if (!strncmp (p, "V1_CAIM", 7)) + return darwin_sections[objc_cat_inst_meth_section]; + else if (!strncmp (p, "V1_PNSM", 7)) + return darwin_sections[objc_cat_inst_meth_section]; + else if (!strncmp (p, "V1_PCLM", 7)) + return darwin_sections[objc_cat_cls_meth_section]; + + else if (!strncmp (p, "V1_CLPR", 7)) + return darwin_sections[objc_cat_cls_meth_section]; + else if (!strncmp (p, "V1_CAPR", 7)) + return darwin_sections[objc_category_section]; /* ??? CHECK me. */ + + else if (!strncmp (p, "V1_PRFS", 7)) + return darwin_sections[objc_cat_cls_meth_section]; + else if (!strncmp (p, "V1_CLRF", 7)) + return darwin_sections[objc_cls_refs_section]; + else if (!strncmp (p, "V1_SRFS", 7)) + return darwin_sections[objc_selector_refs_section]; + + else if (!strncmp (p, "V1_MODU", 7)) + return darwin_sections[objc_module_info_section]; + else if (!strncmp (p, "V1_SYMT", 7)) + return darwin_sections[objc_symbols_section]; + else if (!strncmp (p, "V1_INFO", 7)) + return darwin_sections[objc_image_info_section]; + + else if (!strncmp (p, "V1_PLST", 7)) + return darwin_sections[objc1_prop_list_section]; + else if (!strncmp (p, "V1_PEXT", 7)) + return darwin_sections[objc1_protocol_ext_section]; + else if (!strncmp (p, "V1_CEXT", 7)) + return darwin_sections[objc1_class_ext_section]; + + else if (!strncmp (p, "V2_CSTR", 7)) + return darwin_sections[objc_constant_string_object_section]; + + return base; +} + +section * +machopic_select_section (tree decl, + int reloc, + unsigned HOST_WIDE_INT align) +{ + bool zsize, one, weak, 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_to_uhwi (DECL_SIZE_UNIT (decl)) == 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); + + 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_to_uhwi (DECL_SIZE_UNIT (decl)) != 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: +
, +
+ . + + 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 *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_to_uhwi (DECL_SIZE_UNIT (decl)); + +#ifdef DEBUG_DARWIN_MEM_ALLOCATORS +fprintf (file, "# dadon: %s %s (%llu, %u) local %d weak %d" + " stat %d com %d pub %d t-const %d t-ro %d init %lx\n", + xname, (TREE_CODE (decl) == VAR_DECL?"var":"const"), + (unsigned long long)size, DECL_ALIGN (decl), local_def, + DECL_WEAK (decl), TREE_STATIC (decl), DECL_COMMON (decl), + TREE_PUBLIC (decl), TREE_CONSTANT (decl), TREE_READONLY (decl), + (unsigned long)DECL_INITIAL (decl)); +#endif + + /* Darwin needs help to support local zero-sized objects. + They must be made at least one byte, and the section containing must be + marked as unsuitable for section-anchors (see storage allocators below). + + For non-zero objects this output is handled by varasm.c. + */ + if (!size) + { + unsigned int l2align = 0; + + /* The align must be honored, even for zero-sized. */ + if (DECL_ALIGN (decl)) + { + l2align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT); + fprintf (file, "\t.align\t%u\n", l2align); + } + + ASM_OUTPUT_LABEL (file, xname); + size = 1; + fprintf (file, "\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size); + + /* Check that we've correctly picked up the zero-sized item and placed it + properly. */ + gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors) + || (in_section + && (in_section->common.flags & SECTION_NO_ANCHOR))); + } + else + ASM_OUTPUT_LABEL (file, xname); +} + +/* The implementation of ASM_DECLARE_CONSTANT_NAME. */ +void +darwin_asm_declare_constant_name (FILE *file, const char *name, + const_tree exp ATTRIBUTE_UNUSED, + HOST_WIDE_INT size) +{ + assemble_label (file, name); + /* As for other items, we need at least one byte. */ + if (!size) + { + fputs ("\t.space\t1\n", file); + /* Check that we've correctly picked up the zero-sized item and placed it + properly. */ + gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors) + || (in_section + && (in_section->common.flags & SECTION_NO_ANCHOR))); + } +} + +/* Darwin storage allocators. + + Zerofill sections are desirable for large blank data since, otherwise, these + data bloat objects (PR33210). + + However, section anchors don't work in .zerofill sections (one cannot switch + to a zerofill section). Ergo, for Darwin targets using section anchors we need + to put (at least some) data into 'normal' switchable sections. + + Here we set a relatively arbitrary value for the size of an object to trigger + zerofill when section anchors are enabled (anything bigger than a page for + current Darwin implementations). FIXME: there ought to be some objective way + to make this choice. + + When section anchor are off this is ignored anyway. */ + +#define BYTES_ZFILL 4096 + +/* Emit a chunk of data for items coalesced by the linker. */ +static void +darwin_emit_weak_or_comdat (FILE *fp, tree decl, const char *name, + unsigned HOST_WIDE_INT size, + 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_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 (); + + /* If we are expecting to output NeXT ObjC meta-data, (and we actually see + some) then we output the fix-and-continue marker (Image Info). + This applies to Objective C, Objective C++ and LTO with either language + as part of the input. */ + if (flag_next_runtime && objc_metadata_seen) + { + unsigned int flags = 0; + if (flag_objc_abi >= 2) + { + flags = 16; + output_section_asm_op + (darwin_sections[objc2_image_info_section]->unnamed.data); + } + else + output_section_asm_op + (darwin_sections[objc_image_info_section]->unnamed.data); + + ASM_OUTPUT_ALIGN (asm_out_file, 2); + fputs ("L_OBJC_ImageInfo:\n", asm_out_file); + + flags |= (flag_replace_objc_classes && classes_seen) ? 1 : 0; + flags |= flag_objc_gc ? 2 : 0; + + fprintf (asm_out_file, "\t.long\t0\n\t.long\t%u\n", flags); + } + + machopic_finish (asm_out_file); + if (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"); + } +} + +bool +darwin_libc_has_function (enum function_class fn_class) +{ + if (fn_class == function_sincos) + return false; + if (fn_class == function_c99_math_complex + || fn_class == function_c99_misc) + return (TARGET_64BIT + || strverscmp (darwin_macosx_version_min, "10.3") >= 0); + + return true; +} + +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 *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); + + /* We always put unlikely executed stuff in the cold section. */ + if (freq == NODE_FREQUENCY_UNLIKELY_EXECUTED) + return (weak) ? darwin_sections[text_cold_coal_section] + : darwin_sections[text_cold_section]; + + /* If we have LTO *and* feedback information, then let LTO handle + the function ordering, it makes a better job (for normal, hot, + startup and exit - hence the bailout for cold above). */ + if (in_lto_p && flag_profile_values) + goto default_function_sections; + + /* Non-cold startup code should go to startup subsection. */ + if (startup) + return (weak) ? darwin_sections[text_startup_coal_section] + : darwin_sections[text_startup_section]; + + /* Similarly for exit. */ + if (exit) + return (weak) ? darwin_sections[text_exit_coal_section] + : darwin_sections[text_exit_section]; + + /* Place hot code. */ + if (freq == NODE_FREQUENCY_HOT) + return (weak) ? darwin_sections[text_hot_coal_section] + : darwin_sections[text_hot_section]; + + /* Otherwise, default to the 'normal' non-reordered sections. */ +default_function_sections: + return (weak) ? darwin_sections[text_coal_section] + : text_section; +} + +/* 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" -- cgit v1.2.3