X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fconfig%2Fdarwin.c;h=0673915200f30c2b7fedefaec0233ced6542c319;hb=d53bb22673261b227d5045c435bd2acd4c87c236;hp=0d3ff8f0154c572896d4cb77900dd0eba3cb58e4;hpb=9e96724e9b88bedcb56279959c4ee38f74e3c060;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/config/darwin.c b/gcc/config/darwin.c index 0d3ff8f0154..0673915200f 100644 --- a/gcc/config/darwin.c +++ b/gcc/config/darwin.c @@ -1,5 +1,6 @@ /* Functions for generic Darwin as target machine for GNU C compiler. - Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004 + Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004, + 2005, 2006, 2007 Free Software Foundation, Inc. Contributed by Apple Computer Inc. @@ -17,8 +18,8 @@ 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 COPYING. If not, write to -the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ +the Free Software Foundation, 51 Franklin Street, Fifth Floor, +Boston, MA 02110-1301, USA. */ #include "config.h" #include "system.h" @@ -40,13 +41,110 @@ Boston, MA 02111-1307, USA. */ #include "function.h" #include "ggc.h" #include "langhooks.h" +#include "target.h" #include "tm_p.h" -#include "errors.h" +#include "toplev.h" #include "hashtab.h" +#include "df.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. */ + +/* Section names. */ +section * darwin_sections[NUM_DARWIN_SECTIONS]; + +/* True if we're setting __attribute__ ((ms_struct)). */ +int darwin_ms_struct = false; + +/* A get_unnamed_section callback used to switch to an ObjC section. + DIRECTIVE is as for output_section_asm_op. */ -/* Nonzero if the user passes the -mone-byte-bool switch, which forces - sizeof(bool) to be 1. */ -const char *darwin_one_byte_bool = 0; +static void +output_objc_section_asm_op (const void *directive) +{ + static bool been_here = false; + + if (! been_here) + { + 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 + }; + size_t i; + + been_here = true; + for (i = 0; i < ARRAY_SIZE (tomark); i++) + switch_to_section (darwin_sections[tomark[i]]); + } + output_section_asm_op (directive); +} + +/* 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) @@ -58,17 +156,30 @@ name_needs_quotes (const char *name) return 0; } -/* - * flag_pic = 1 ... generate only indirections - * flag_pic = 2 ... generate indirections and pure code - */ - +/* Return true if SYM_REF can be used without an indirection. */ static int machopic_symbol_defined_p (rtx sym_ref) { - return ((SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED) - /* Local symbols must always be defined. */ - || SYMBOL_REF_LOCAL_P (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 @@ -83,19 +194,63 @@ machopic_classify_symbol (rtx sym_ref) flags = SYMBOL_REF_FLAGS (sym_ref); function_p = SYMBOL_REF_FUNCTION_P (sym_ref); if (machopic_symbol_defined_p (sym_ref)) - return (function_p + return (function_p ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA); else - return (function_p + 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; @@ -106,8 +261,8 @@ void machopic_define_symbol (rtx mem) { rtx sym_ref; - if (GET_CODE (mem) != MEM) - abort (); + + gcc_assert (GET_CODE (mem) == MEM); sym_ref = XEXP (mem, 0); SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED; } @@ -118,8 +273,7 @@ const char * machopic_function_base_name (void) { /* if dynamic-no-pic is on, we should not get here */ - if (MACHO_DYNAMIC_NO_PIC_P) - abort (); + gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); if (function_base == NULL) function_base = @@ -138,11 +292,22 @@ machopic_function_base_sym (void) rtx sym_ref; sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ()); - SYMBOL_REF_FLAGS (sym_ref) + SYMBOL_REF_FLAGS (sym_ref) |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED); return sym_ref; } +/* Return either ORIG or (const:P (minus:P ORIG PIC_BASE)), depending + on whether pic_base is NULL or not. */ +static inline rtx +gen_pic_offset (rtx orig, rtx pic_base) +{ + if (!pic_base) + return orig; + else + return gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, orig, pic_base)); +} + static GTY(()) const char * function_base_func_name; static GTY(()) int current_pic_label_num; @@ -152,8 +317,7 @@ machopic_output_function_base_name (FILE *file) const char *current_name; /* If dynamic-no-pic is on, we should not get here. */ - if (MACHO_DYNAMIC_NO_PIC_P) - abort (); + gcc_assert (!MACHO_DYNAMIC_NO_PIC_P); current_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); if (function_base_func_name != current_name) @@ -173,9 +337,8 @@ typedef struct machopic_indirection GTY (()) { /* The SYMBOL_REF for the entity referenced. */ rtx symbol; - /* The IDENTIFIER_NODE giving the name of the stub or non-lazy - pointer. */ - tree ptr_name; + /* 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; @@ -186,7 +349,7 @@ typedef struct machopic_indirection GTY (()) /* 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 +static GTY ((param_is (struct machopic_indirection))) htab_t machopic_indirections; /* Return a hash value for a SLOT in the indirections hash table. */ @@ -195,7 +358,7 @@ static hashval_t machopic_indirection_hash (const void *slot) { const machopic_indirection *p = (const machopic_indirection *) slot; - return IDENTIFIER_HASH_VALUE (p->ptr_name); + return htab_hash_string (p->ptr_name); } /* Returns true if the KEY is the same as that associated with @@ -204,7 +367,7 @@ machopic_indirection_hash (const void *slot) static int machopic_indirection_eq (const void *slot, const void *key) { - return ((const machopic_indirection *) slot)->ptr_name == (tree) key; + return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0; } /* Return the name of the non-lazy pointer (if STUB_P is false) or @@ -215,73 +378,82 @@ machopic_indirection_name (rtx sym_ref, bool stub_p) { char *buffer; const char *name = XSTR (sym_ref, 0); - int namelen = strlen (name); - tree ptr_name; + size_t namelen = strlen (name); machopic_indirection *p; - - /* Construct the name of the non-lazy pointer or stub. */ - if (stub_p) + void ** slot; + bool saw_star = false; + bool needs_quotes; + const char *suffix; + const char *prefix = user_label_prefix; + const char *quote = ""; + tree id; + + id = maybe_get_identifier (name); + if (id) { - int needs_quotes = name_needs_quotes (name); - buffer = alloca (strlen ("&L") - + namelen - + strlen (STUB_SUFFIX) - + 2 /* possible quotes */ - + 1 /* '\0' */); - - if (needs_quotes) + tree id_orig = id; + + while (IDENTIFIER_TRANSPARENT_ALIAS (id)) + id = TREE_CHAIN (id); + if (id != id_orig) { - if (name[0] == '*') - sprintf (buffer, "&\"L%s" STUB_SUFFIX "\"", name + 1); - else - sprintf (buffer, "&\"L%s%s" STUB_SUFFIX "\"", user_label_prefix, - name); + name = IDENTIFIER_POINTER (id); + namelen = strlen (name); } - else if (name[0] == '*') - sprintf (buffer, "&L%s" STUB_SUFFIX, name + 1); - else - sprintf (buffer, "&L%s%s" STUB_SUFFIX, user_label_prefix, name); } - else + + if (name[0] == '*') { - buffer = alloca (strlen ("&L") - + strlen (user_label_prefix) - + namelen - + strlen (NON_LAZY_POINTER_SUFFIX) - + 1 /* '\0' */); - if (name[0] == '*') - sprintf (buffer, "&L%s" NON_LAZY_POINTER_SUFFIX, name + 1); - else - sprintf (buffer, "&L%s%s" NON_LAZY_POINTER_SUFFIX, - user_label_prefix, name); + saw_star = true; + prefix = ""; + ++name; + --namelen; } - /* See if we already have it. */ - ptr_name = maybe_get_identifier (buffer); - /* If not, create a mapping from the non-lazy pointer to the - SYMBOL_REF. */ - if (!ptr_name) + needs_quotes = name_needs_quotes (name); + if (needs_quotes) + { + quote = "\""; + } + + if (stub_p) + suffix = STUB_SUFFIX; + else + suffix = NON_LAZY_POINTER_SUFFIX; + + buffer = alloca (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 { - void **slot; - ptr_name = get_identifier (buffer); p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection)); p->symbol = sym_ref; - p->ptr_name = ptr_name; + p->ptr_name = xstrdup (buffer); p->stub_p = stub_p; - p->used = 0; - 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, ptr_name, - IDENTIFIER_HASH_VALUE (ptr_name), - INSERT); - *((machopic_indirection **) slot) = p; + p->used = false; + *slot = p; } - - return IDENTIFIER_POINTER (ptr_name); + + return p->ptr_name; } /* Return the name of the stub for the mcount function. */ @@ -289,7 +461,8 @@ machopic_indirection_name (rtx sym_ref, bool stub_p) const char* machopic_mcount_stub_name (void) { - return "&L*mcount$stub"; + 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 @@ -300,18 +473,27 @@ machopic_mcount_stub_name (void) void machopic_validate_stub_or_non_lazy_ptr (const char *name) { - tree ident = get_identifier (name); - machopic_indirection *p; - - p = ((machopic_indirection *) - (htab_find_with_hash (machopic_indirections, ident, - IDENTIFIER_HASH_VALUE (ident)))); - if (p) + + p = ((machopic_indirection *) + (htab_find_with_hash (machopic_indirections, name, + htab_hash_string (name)))); + if (p && ! p->used) { - p->used = 1; - mark_referenced (ident); - mark_referenced (get_identifier (XSTR (p->symbol, 0))); + 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); } } @@ -333,11 +515,13 @@ machopic_indirect_data_reference (rtx orig, rtx reg) if (defined && MACHO_DYNAMIC_NO_PIC_P) { #if defined (TARGET_TOC) - emit_insn (gen_macho_high (reg, orig)); - emit_insn (gen_macho_low (reg, reg, orig)); + /* 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)); #else /* some other cpu -- writeme! */ - abort (); + gcc_unreachable (); #endif return reg; } @@ -345,15 +529,15 @@ machopic_indirect_data_reference (rtx orig, rtx reg) { #if defined (TARGET_TOC) || defined (HAVE_lo_sum) rtx pic_base = machopic_function_base_sym (); - rtx offset = gen_rtx_CONST (Pmode, - gen_rtx_MINUS (Pmode, orig, pic_base)); + rtx offset = gen_pic_offset (orig, pic_base); #endif #if defined (TARGET_TOC) /* i.e., PowerPC */ - rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode)); + rtx hi_sum_reg = (!can_create_pseudo_p () + ? reg + : gen_reg_rtx (Pmode)); - if (reg == NULL) - abort (); + gcc_assert (reg); emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, gen_rtx_PLUS (Pmode, pic_offset_table_rtx, @@ -364,7 +548,7 @@ machopic_indirect_data_reference (rtx orig, rtx reg) orig = reg; #else #if defined (HAVE_lo_sum) - if (reg == 0) abort (); + gcc_assert (reg); emit_insn (gen_rtx_SET (VOIDmode, reg, gen_rtx_HIGH (Pmode, offset))); @@ -378,14 +562,14 @@ machopic_indirect_data_reference (rtx orig, rtx reg) return orig; } - ptr_ref = (gen_rtx_SYMBOL_REF - (Pmode, + ptr_ref = (gen_rtx_SYMBOL_REF + (Pmode, machopic_indirection_name (orig, /*stub_p=*/false))); - SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig); + SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig); - ptr_ref = gen_rtx_MEM (Pmode, ptr_ref); - MEM_READONLY_P (ptr_ref) = 1; + ptr_ref = gen_const_mem (Pmode, ptr_ref); + machopic_define_symbol (ptr_ref); return ptr_ref; } @@ -456,20 +640,20 @@ machopic_indirect_call_target (rtx target) if (GET_CODE (target) != MEM) return target; - if (MACHOPIC_INDIRECT + 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, + const char *stub_name = machopic_indirection_name (sym_ref, /*stub_p=*/true); enum machine_mode mode = GET_MODE (sym_ref); - tree decl = SYMBOL_REF_DECL (sym_ref); - + XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name); - SYMBOL_REF_DECL (XEXP (target, 0)) = decl; + SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref); MEM_READONLY_P (target) = 1; + MEM_NOTRAP_P (target) = 1; } return target; @@ -503,9 +687,9 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) return reg; } - /* if dynamic-no-pic then use 0 as the pic base */ + /* if dynamic-no-pic we don't have a pic base */ if (MACHO_DYNAMIC_NO_PIC_P) - pic_base = CONST0_RTX (Pmode); + pic_base = NULL; else pic_base = machopic_function_base_sym (); @@ -513,10 +697,8 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) { if (reg == 0) { - if (reload_in_progress) - abort (); - else - reg = gen_reg_rtx (Pmode); + gcc_assert (!reload_in_progress); + reg = gen_reg_rtx (Pmode); } #ifdef HAVE_lo_sum @@ -525,18 +707,20 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) || GET_CODE (XEXP (orig, 0)) == LABEL_REF)) { #if defined (TARGET_TOC) /* ppc */ - rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode); + 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_rtx_MEM (GET_MODE (orig), - gen_rtx_LO_SUM (Pmode, temp_reg, asym)); - MEM_READONLY_P (mem) = 1; + mem = gen_const_mem (GET_MODE (orig), + gen_rtx_LO_SUM (Pmode, temp_reg, asym)); emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); #else - /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */ - abort (); + /* Some other CPU -- WriteMe! but right now there are no other + platforms that can use dynamic-no-pic */ + gcc_unreachable (); #endif pic_ref = reg; } @@ -544,41 +728,38 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF || GET_CODE (XEXP (orig, 0)) == LABEL_REF) { - rtx offset = gen_rtx_CONST (Pmode, - gen_rtx_MINUS (Pmode, - XEXP (orig, 0), - pic_base)); + rtx offset = gen_pic_offset (XEXP (orig, 0), pic_base); #if defined (TARGET_TOC) /* i.e., PowerPC */ /* Generating a new reg may expose opportunities for common subexpression elimination. */ - rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode); + 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_rtx_MEM (GET_MODE (orig), - gen_rtx_LO_SUM (Pmode, - hi_sum_reg, offset)); - MEM_READONLY_P (mem) = 1; + mem = gen_const_mem (GET_MODE (orig), + gen_rtx_LO_SUM (Pmode, + hi_sum_reg, offset)); insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem)); - REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref, - REG_NOTES (insn)); + set_unique_reg_note (insn, REG_EQUAL, pic_ref); pic_ref = reg; #else emit_insn (gen_rtx_USE (VOIDmode, - gen_rtx_REG (Pmode, + gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM))); emit_insn (gen_rtx_SET (VOIDmode, reg, gen_rtx_HIGH (Pmode, - gen_rtx_CONST (Pmode, + gen_rtx_CONST (Pmode, offset)))); emit_insn (gen_rtx_SET (VOIDmode, reg, gen_rtx_LO_SUM (Pmode, reg, @@ -598,22 +779,20 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) } #if 0 emit_insn (gen_rtx_USE (VOIDmode, - gen_rtx_REG (Pmode, + gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM))); #endif - pic_ref = gen_rtx_PLUS (Pmode, - pic, - gen_rtx_CONST (Pmode, - gen_rtx_MINUS (Pmode, - XEXP (orig, 0), - pic_base))); + if (reload_in_progress) + df_set_regs_ever_live (REGNO (pic), true); + pic_ref = gen_rtx_PLUS (Pmode, pic, + gen_pic_offset (XEXP (orig, 0), + pic_base)); } #if !defined (TARGET_TOC) emit_move_insn (reg, pic_ref); - pic_ref = gen_rtx_MEM (GET_MODE (orig), reg); - MEM_READONLY_P (pic_ref) = 1; + pic_ref = gen_const_mem (GET_MODE (orig), reg); #endif } else @@ -623,18 +802,14 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) if (GET_CODE (orig) == SYMBOL_REF || GET_CODE (orig) == LABEL_REF) { - rtx offset = gen_rtx_CONST (Pmode, - gen_rtx_MINUS (Pmode, - orig, pic_base)); + rtx offset = gen_pic_offset (orig, pic_base); #if defined (TARGET_TOC) /* i.e., PowerPC */ rtx hi_sum_reg; if (reg == 0) { - if (reload_in_progress) - abort (); - else - reg = gen_reg_rtx (Pmode); + gcc_assert (!reload_in_progress); + reg = gen_reg_rtx (Pmode); } hi_sum_reg = reg; @@ -644,7 +819,7 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) ? gen_rtx_HIGH (Pmode, offset) : gen_rtx_PLUS (Pmode, pic_offset_table_rtx, - gen_rtx_HIGH (Pmode, + gen_rtx_HIGH (Pmode, offset)))); emit_insn (gen_rtx_SET (VOIDmode, reg, gen_rtx_LO_SUM (Pmode, @@ -662,7 +837,8 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) else #endif /* HAVE_lo_sum */ { - if (GET_CODE (orig) == REG) + if (REG_P (orig) + || GET_CODE (orig) == SUBREG) { return orig; } @@ -678,11 +854,11 @@ machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg) emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx)); #endif + if (reload_in_progress) + df_set_regs_ever_live (REGNO (pic), true); pic_ref = gen_rtx_PLUS (Pmode, pic, - gen_rtx_CONST (Pmode, - gen_rtx_MINUS (Pmode, - orig, pic_base))); + gen_pic_offset (orig, pic_base)); } } } @@ -767,18 +943,30 @@ machopic_output_indirection (void **slot, void *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 = IDENTIFIER_POINTER (p->ptr_name); - + 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 = alloca (strlen (sym_name) + 2); if (sym_name[0] == '*' || sym_name[0] == '&') @@ -794,11 +982,13 @@ machopic_output_indirection (void **slot, void *data) else sprintf (stub, "%s%s", user_label_prefix, ptr_name); - machopic_output_stub (asm_out_file, sym, stub); + machopic_output_stub (asm_out_file, sym, stub); } - else if (machopic_symbol_defined_p (symbol)) + else if (! indirect_data (symbol) + && (machopic_symbol_defined_p (symbol) + || SYMBOL_REF_LOCAL_P (symbol))) { - data_section (); + switch_to_section (data_section); assemble_align (GET_MODE_ALIGNMENT (Pmode)); assemble_label (ptr_name); assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name), @@ -807,18 +997,31 @@ machopic_output_indirection (void **slot, void *data) } else { - machopic_nl_symbol_ptr_section (); + rtx init = const0_rtx; + + switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]); 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"); - - assemble_integer (const0_rtx, GET_MODE_SIZE (Pmode), + + /* 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; } @@ -826,7 +1029,7 @@ void machopic_finish (FILE *asm_out_file) { if (machopic_indirections) - htab_traverse_noresize (machopic_indirections, + htab_traverse_noresize (machopic_indirections, machopic_output_indirection, asm_out_file); } @@ -878,26 +1081,16 @@ darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED) SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE; if (!DECL_EXTERNAL (decl) - && (!TREE_PUBLIC (decl) || (!DECL_ONE_ONLY (decl) && !DECL_WEAK (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; -} -void -darwin_make_decl_one_only (tree decl) -{ - static const char *text_section = "__TEXT,__textcoal_nt,coalesced,no_toc"; - static const char *data_section = "__DATA,__datacoal_nt,coalesced,no_toc"; - - const char *sec = TREE_CODE (decl) == FUNCTION_DECL - ? text_section - : data_section; - TREE_PUBLIC (decl) = 1; - DECL_ONE_ONLY (decl) = 1; - DECL_SECTION_NAME (decl) = build_string (strlen (sec), sec); + if (! TREE_PUBLIC (decl)) + SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC; } void @@ -908,144 +1101,265 @@ darwin_mark_decl_preserved (const char *name) fputc ('\n', asm_out_file); } -void -machopic_select_section (tree exp, int reloc, - unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) +static section * +darwin_text_section (int reloc, int weak) { - void (*base_function)(void); - - if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT)) - base_function = readonly_data_section; - else if (TREE_READONLY (exp) || TREE_CONSTANT (exp)) - base_function = const_data_section; + if (reloc) + return (weak + ? darwin_sections[text_unlikely_coal_section] + : unlikely_text_section ()); else - base_function = data_section; + return (weak + ? darwin_sections[text_coal_section] + : text_section); +} + +static section * +darwin_rodata_section (int weak) +{ + return (weak + ? darwin_sections[const_coal_section] + : darwin_sections[const_section]); +} - if (TREE_CODE (exp) == STRING_CST +static section * +darwin_mergeable_string_section (tree exp, + unsigned HOST_WIDE_INT align) +{ + if (flag_merge_constants + && TREE_CODE (exp) == STRING_CST + && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE + && align <= 256 && ((size_t) TREE_STRING_LENGTH (exp) == strlen (TREE_STRING_POINTER (exp)) + 1)) - cstring_section (); - else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST) - && flag_merge_constants) + return darwin_sections[cstring_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) +{ + enum machine_mode mode = DECL_MODE (exp); + unsigned int modesize = GET_MODE_BITSIZE (mode); + + if (flag_merge_constants + && mode != VOIDmode + && mode != BLKmode + && modesize <= align + && align >= 8 + && align <= 256 + && (align & (align -1)) == 0) { - tree size = TYPE_SIZE (TREE_TYPE (exp)); - - if (TREE_CODE (size) == INTEGER_CST && - TREE_INT_CST_LOW (size) == 4 && - TREE_INT_CST_HIGH (size) == 0) - literal4_section (); - else if (TREE_CODE (size) == INTEGER_CST && - TREE_INT_CST_LOW (size) == 8 && - TREE_INT_CST_HIGH (size) == 0) - literal8_section (); + 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 - base_function (); + return readonly_data_section; } - else if (TREE_CODE (exp) == CONSTRUCTOR - && TREE_TYPE (exp) - && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE - && TYPE_NAME (TREE_TYPE (exp))) + + return readonly_data_section; +} + +int +machopic_reloc_rw_mask (void) +{ + return MACHOPIC_INDIRECT ? 3 : 0; +} + +section * +machopic_select_section (tree decl, + int reloc, + unsigned HOST_WIDE_INT align) +{ + bool weak = (DECL_P (decl) + && DECL_WEAK (decl) + && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl)) + || ! lookup_attribute ("weak_import", + DECL_ATTRIBUTES (decl)))); + section *base_section; + + switch (categorize_decl_for_section (decl, reloc)) { - tree name = TYPE_NAME (TREE_TYPE (exp)); + case SECCAT_TEXT: + base_section = darwin_text_section (reloc, weak); + break; + + case SECCAT_RODATA: + case SECCAT_SRODATA: + base_section = darwin_rodata_section (weak); + 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); + 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: + case SECCAT_BSS: + case SECCAT_SBSS: + case SECCAT_TBSS: + if (TREE_READONLY (decl) || TREE_CONSTANT (decl)) + base_section = weak ? darwin_sections[const_data_coal_section] + : darwin_sections[const_data_section]; + else + base_section = weak ? darwin_sections[data_coal_section] : data_section; + break; + + default: + gcc_unreachable (); + } + + /* Darwin weird special cases. */ + 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), "NSConstantString")) - objc_constant_string_object_section (); - else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString")) - objc_string_object_section (); + name = DECL_NAME (name); + + if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString")) + { + if (flag_next_runtime) + return darwin_sections[objc_constant_string_object_section]; + else + return darwin_sections[objc_string_object_section]; + } else - base_function (); + return base_section; } - else if (TREE_CODE (exp) == VAR_DECL && - DECL_NAME (exp) && - TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE && - IDENTIFIER_POINTER (DECL_NAME (exp)) && - !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6)) + else if (TREE_CODE (decl) == VAR_DECL + && DECL_NAME (decl) + && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE + && IDENTIFIER_POINTER (DECL_NAME (decl)) + && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6)) { - const char *name = IDENTIFIER_POINTER (DECL_NAME (exp)); + const char *name = IDENTIFIER_POINTER (DECL_NAME (decl)); if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20)) - objc_cls_meth_section (); + return darwin_sections[objc_cls_meth_section]; else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23)) - objc_inst_meth_section (); + return darwin_sections[objc_inst_meth_section]; else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20)) - objc_cat_cls_meth_section (); + return darwin_sections[objc_cat_cls_meth_section]; else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23)) - objc_cat_inst_meth_section (); + return darwin_sections[objc_cat_inst_meth_section]; else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22)) - objc_class_vars_section (); + return darwin_sections[objc_class_vars_section]; else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25)) - objc_instance_vars_section (); + return darwin_sections[objc_instance_vars_section]; else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22)) - objc_cat_cls_meth_section (); + return darwin_sections[objc_cat_cls_meth_section]; else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17)) - objc_class_names_section (); + return darwin_sections[objc_class_names_section]; else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20)) - objc_meth_var_names_section (); + return darwin_sections[objc_meth_var_names_section]; else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20)) - objc_meth_var_types_section (); + return darwin_sections[objc_meth_var_types_section]; else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22)) - objc_cls_refs_section (); + return darwin_sections[objc_cls_refs_section]; else if (!strncmp (name, "_OBJC_CLASS_", 12)) - objc_class_section (); + return darwin_sections[objc_class_section]; else if (!strncmp (name, "_OBJC_METACLASS_", 16)) - objc_meta_class_section (); + return darwin_sections[objc_meta_class_section]; else if (!strncmp (name, "_OBJC_CATEGORY_", 15)) - objc_category_section (); + return darwin_sections[objc_category_section]; else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25)) - objc_selector_refs_section (); + return darwin_sections[objc_selector_refs_section]; else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20)) - objc_selector_fixup_section (); + return darwin_sections[objc_selector_fixup_section]; else if (!strncmp (name, "_OBJC_SYMBOLS", 13)) - objc_symbols_section (); + return darwin_sections[objc_symbols_section]; else if (!strncmp (name, "_OBJC_MODULES", 13)) - objc_module_info_section (); + return darwin_sections[objc_module_info_section]; else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16)) - objc_image_info_section (); + return darwin_sections[objc_image_info_section]; else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) - objc_cat_inst_meth_section (); + return darwin_sections[objc_cat_inst_meth_section]; else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) - objc_cat_cls_meth_section (); + return darwin_sections[objc_cat_cls_meth_section]; else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20)) - objc_cat_cls_meth_section (); + return darwin_sections[objc_cat_cls_meth_section]; else if (!strncmp (name, "_OBJC_PROTOCOL_", 15)) - objc_protocol_section (); + return darwin_sections[objc_protocol_section]; else - base_function (); + return base_section; } - else - base_function (); + + return base_section; } /* This can be called with address expressions as "rtx". They must go in "const". */ -void +section * machopic_select_rtx_section (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED) { - if (GET_MODE_SIZE (mode) == 8) - literal8_section (); + 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)) - literal4_section (); + 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)) - const_data_section (); + return darwin_sections[const_data_section]; else - const_section (); + return darwin_sections[const_section]; } void machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED) { if (MACHOPIC_INDIRECT) - mod_init_section (); + switch_to_section (darwin_sections[mod_init_section]); else - constructor_section (); + switch_to_section (darwin_sections[constructor_section]); assemble_align (POINTER_SIZE); assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); @@ -1057,9 +1371,9 @@ void machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED) { if (MACHOPIC_INDIRECT) - mod_term_section (); + switch_to_section (darwin_sections[mod_term_section]); else - destructor_section (); + switch_to_section (darwin_sections[destructor_section]); assemble_align (POINTER_SIZE); assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); @@ -1075,90 +1389,117 @@ darwin_globalize_label (FILE *stream, const char *name) } void -darwin_asm_named_section (const char *name, unsigned int flags ATTRIBUTE_UNUSED) +darwin_asm_named_section (const char *name, + unsigned int flags ATTRIBUTE_UNUSED, + tree decl ATTRIBUTE_UNUSED) { - fprintf (asm_out_file, ".section %s\n", name); + fprintf (asm_out_file, "\t.section %s\n", name); } -unsigned int -darwin_section_type_flags (tree decl, const char *name, int reloc) +void +darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED) { - unsigned int flags = default_section_type_flags (decl, name, reloc); - - /* Weak or linkonce variables live in a writable section. */ - if (decl != 0 && TREE_CODE (decl) != FUNCTION_DECL - && (DECL_WEAK (decl) || DECL_ONE_ONLY (decl))) - flags |= SECTION_WRITE; - - return flags; -} - -void -darwin_unique_section (tree decl, 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) { - /* Darwin does not use unique sections. However, the target's - unique_section hook is called for linkonce symbols. We need - to set an appropriate section for such symbols. */ - if (DECL_ONE_ONLY (decl) && !DECL_SECTION_NAME (decl)) - darwin_make_decl_one_only (decl); + /* APPLE KEXT stuff -- only applies with pure static C++ code. */ + if (! TARGET_KEXTABI) + { + warning (0, "%<%s%> 2.95 vtable-compatibility attribute applies " + "only when compiling a kext", IDENTIFIER_POINTER (name)); + + *no_add_attrs = true; + } + else if (TREE_CODE (*node) != RECORD_TYPE) + { + warning (0, "%<%s%> 2.95 vtable-compatibility attribute applies " + "only to C++ classes", IDENTIFIER_POINTER (name)); + + *no_add_attrs = true; + } + + return NULL_TREE; } -#define HAVE_DEAD_STRIP 0 +/* 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, "%qs attribute ignored", + IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else + declare_weak (*node); + + return NULL_TREE; +} static void no_dead_strip (FILE *file, const char *lab) { - if (HAVE_DEAD_STRIP) - fprintf (file, ".no_dead_strip %s\n", lab); + fprintf (file, ".no_dead_strip %s\n", lab); } -/* Emit a label for an FDE, making it global and/or weak if appropriate. +/* 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 +void darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty) { - tree id = DECL_ASSEMBLER_NAME (decl) - ? DECL_ASSEMBLER_NAME (decl) - : DECL_NAME (decl); - - const char *prefix = "_"; - const int prefix_len = 1; - - const char *base = IDENTIFIER_POINTER (id); - unsigned int base_len = IDENTIFIER_LENGTH (id); + const char *base; + char *lab; + bool need_quotes; - const char *suffix = ".eh"; + if (DECL_ASSEMBLER_NAME_SET_P (decl)) + base = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); + else + base = IDENTIFIER_POINTER (DECL_NAME (decl)); - int need_quotes = name_needs_quotes (base); - int quotes_len = need_quotes ? 2 : 0; - char *lab; + base = targetm.strip_name_encoding (base); + need_quotes = name_needs_quotes (base); if (! for_eh) - suffix = ".eh1"; - - lab = xmalloc (prefix_len + base_len + strlen (suffix) + quotes_len + 1); - lab[0] = '\0'; + return; - if (need_quotes) - strcat(lab, "\""); - strcat(lab, prefix); - strcat(lab, base); - strcat(lab, suffix); - if (need_quotes) - strcat(lab, "\""); + lab = concat (need_quotes ? "\"" : "", user_label_prefix, base, ".eh", + need_quotes ? "\"" : "", NULL); if (TREE_PUBLIC (decl)) - fprintf (file, "%s %s\n", + fprintf (file, "\t%s %s\n", (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN ? ".globl" : ".private_extern"), lab); - if (DECL_ONE_ONLY (decl) && TREE_PUBLIC (decl)) - fprintf (file, ".weak_definition %s\n", lab); + if (DECL_WEAK (decl)) + fprintf (file, "\t.weak_definition %s\n", lab); if (empty) { @@ -1176,15 +1517,25 @@ darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty) free (lab); } -/* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */ +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; - if (GET_CODE (addr) != SYMBOL_REF) - abort (); + gcc_assert (GET_CODE (addr) == SYMBOL_REF); nlp_name = machopic_indirection_name (addr, /*stub_p=*/false); fputs ("\t.long\t", file); @@ -1198,7 +1549,7 @@ darwin_non_lazy_pcrel (FILE *file, rtx addr) extern". There is no MACH-O equivalent of ELF's VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */ -void +void darwin_assemble_visibility (tree decl, int vis) { if (vis == VISIBILITY_DEFAULT) @@ -1211,8 +1562,8 @@ darwin_assemble_visibility (tree decl, int vis) fputs ("\n", asm_out_file); } else - warning ("internal and protected visibility attributes not supported" - "in this configuration; ignored"); + warning (OPT_Wattributes, "internal and protected visibility attributes " + "not supported in this configuration; ignored"); } /* Output a difference of two labels that will be an assembly time @@ -1225,21 +1576,80 @@ darwin_assemble_visibility (tree decl, int vis) static int darwin_dwarf_label_counter; void -darwin_asm_output_dwarf_delta (FILE *file, int size ATTRIBUTE_UNUSED, +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$%d,", darwin_dwarf_label_counter); else - fprintf (file, "\t%s\t", ".long"); - assemble_name (file, lab1); + fprintf (file, "\t%s\t", directive); + assemble_name_raw (file, lab1); fprintf (file, "-"); - assemble_name (file, lab2); + assemble_name_raw (file, lab2); if (islocaldiff) - fprintf (file, "\n\t.long L$set$%d", darwin_dwarf_label_counter++); + fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++); +} + +/* Output labels for the start of the DWARF sections if necessary. */ +void +darwin_file_start (void) +{ + if (write_symbols == DWARF2_DEBUG) + { + static const char * const debugnames[] = + { + DEBUG_FRAME_SECTION, + DEBUG_INFO_SECTION, + DEBUG_ABBREV_SECTION, + DEBUG_ARANGES_SECTION, + DEBUG_MACINFO_SECTION, + DEBUG_LINE_SECTION, + DEBUG_LOC_SECTION, + DEBUG_PUBNAMES_SECTION, + DEBUG_PUBTYPES_SECTION, + DEBUG_STR_SECTION, + DEBUG_RANGES_SECTION + }; + size_t i; + + for (i = 0; i < ARRAY_SIZE (debugnames); i++) + { + int namelen; + + switch_to_section (get_section (debugnames[i], SECTION_DEBUG, NULL)); + + gcc_assert (strncmp (debugnames[i], "__DWARF,", 8) == 0); + gcc_assert (strchr (debugnames[i] + 8, ',')); + + namelen = strchr (debugnames[i] + 8, ',') - (debugnames[i] + 8); + fprintf (asm_out_file, "Lsection%.*s:\n", namelen, debugnames[i] + 8); + } + } +} + +/* 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); } void @@ -1248,11 +1658,79 @@ darwin_file_end (void) machopic_finish (asm_out_file); if (strcmp (lang_hooks.name, "GNU C++") == 0) { - constructor_section (); - destructor_section (); + switch_to_section (darwin_sections[constructor_section]); + switch_to_section (darwin_sections[destructor_section]); ASM_OUTPUT_ALIGN (asm_out_file, 1); } 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 (tree decl) +{ + return default_binds_local_p_1 (decl, + TARGET_KEXTABI && DARWIN_VTABLE_P (decl)); +} + +#if 0 +/* See TARGET_ASM_OUTPUT_ANCHOR for why we can't do this yet. */ +/* 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)); +} +#endif + +/* 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) +{ + 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; + } + if (flag_var_tracking + && strverscmp (darwin_macosx_version_min, "10.5") >= 0) + flag_var_tracking_uninit = 1; +} + #include "gt-darwin.h"