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|
/* Target definitions for Darwin (Mac OS X) systems.
Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002
Free Software Foundation, Inc.
Contributed by Apple Computer Inc.
This file is part of GNU CC.
GNU CC 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 2, or (at your option)
any later version.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* The definitions in this file are common to all processor types
running Darwin, which is the kernel for Mac OS X. Darwin is
basically a BSD user layer laid over a Mach kernel, then evolved
for many years (at NeXT) in parallel with other Unix systems. So
while the runtime is a somewhat idiosyncratic Mach-based thing,
other definitions look like they would for a BSD variant. */
/* Although NeXT ran on many different architectures, as of Jan 2001
the only supported Darwin targets are PowerPC and x86. */
/* Technically, STANDARD_EXEC_PREFIX should be /usr/libexec/, but in
practice this makes it hard to install new compilers elsewhere, so
leave it undefined and expect system builders to set configure args
correctly. */
/* One of Darwin's NeXT legacies is the Mach-O format, which is partly
like a.out and partly like COFF, with additional features like
multi-architecture binary support. */
#define OBJECT_FORMAT_MACHO
/* Suppress g++ attempt to link in the math library automatically.
(Some Darwin versions have a libm, but they seem to cause problems
for C++ executables.) */
#define MATH_LIBRARY ""
/* We have atexit. */
#define HAVE_ATEXIT
/* Define an empty body for the function do_global_dtors() in libgcc2.c. */
#define DO_GLOBAL_DTORS_BODY
/* The string value for __SIZE_TYPE__. */
#ifndef SIZE_TYPE
#define SIZE_TYPE "long unsigned int"
#endif
/* Type used for ptrdiff_t, as a string used in a declaration. */
#undef PTRDIFF_TYPE
#define PTRDIFF_TYPE "int"
/* wchar_t is int. */
#undef WCHAR_TYPE
#define WCHAR_TYPE "int"
#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 32
/* Default to using the NeXT-style runtime, since that's what is
pre-installed on Darwin systems. */
#define NEXT_OBJC_RUNTIME
/* Don't default to pcc-struct-return, because gcc is the only compiler, and
we want to retain compatibility with older gcc versions. */
#undef DEFAULT_PCC_STRUCT_RETURN
#define DEFAULT_PCC_STRUCT_RETURN 0
/* Machine dependent cpp options. */
#undef CPP_SPEC
#define CPP_SPEC "%{static:-D__STATIC__}%{!static:-D__DYNAMIC__}"
/* Machine dependent libraries. */
#undef LIB_SPEC
#define LIB_SPEC "%{!static:-lSystem}"
/* We specify crt0.o as -lcrt0.o so that ld will search the library path. */
#undef STARTFILE_SPEC
#define STARTFILE_SPEC \
"%{pg:%{static:-lgcrt0.o}%{!static:-lgcrt1.o -lcrtbegin.o}} \
%{!pg:%{static:-lcrt0.o}%{!static:-lcrt1.o -lcrtbegin.o}}"
#undef ENDFILE_SPEC
#define ENDFILE_SPEC \
"-lcrtend.o"
#undef DOLLARS_IN_IDENTIFIERS
#define DOLLARS_IN_IDENTIFIERS 2
/* We use Dbx symbol format. */
#define DBX_DEBUGGING_INFO 1
/* When generating stabs debugging, use N_BINCL entries. */
#define DBX_USE_BINCL
/* There is no limit to the length of stabs strings. */
#define DBX_CONTIN_LENGTH 0
/* gdb needs a null N_SO at the end of each file for scattered loading. */
#undef DBX_OUTPUT_MAIN_SOURCE_FILE_END
#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
do { text_section (); \
fprintf (FILE, \
"\t.stabs \"%s\",%d,0,0,Letext\nLetext:\n", "" , N_SO); \
} while (0)
/* Our profiling scheme doesn't LP labels and counter words. */
#define NO_PROFILE_COUNTERS
#undef INIT_SECTION_ASM_OP
#define INIT_SECTION_ASM_OP
#undef INVOKE__main
#define TARGET_ASM_CONSTRUCTOR machopic_asm_out_constructor
#define TARGET_ASM_DESTRUCTOR machopic_asm_out_destructor
/* Always prefix with an underscore. */
#define USER_LABEL_PREFIX "_"
/* Don't output a .file directive. That is only used by the assembler for
error reporting. */
#undef ASM_FILE_START
#define ASM_FILE_START(FILE)
#undef ASM_FILE_END
#define ASM_FILE_END(FILE) \
do { \
machopic_finish (asm_out_file); \
if (strcmp (lang_hooks.name, "GNU C++") == 0) \
{ \
constructor_section (); \
destructor_section (); \
ASM_OUTPUT_ALIGN (FILE, 1); \
} \
} while (0)
#define ASM_OUTPUT_SKIP(FILE,SIZE) \
fprintf (FILE, "\t.space %d\n", SIZE)
/* Give ObjC methods pretty symbol names. */
#undef OBJC_GEN_METHOD_LABEL
#define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
do { if (CAT_NAME) \
sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+', \
(CLASS_NAME), (CAT_NAME), (SEL_NAME)); \
else \
sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+', \
(CLASS_NAME), (SEL_NAME)); \
} while (0)
/* 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_name calls are telling the machopic subsystem
that the name *is* defined in this module, so it doesn't need to
make them indirect. */
#undef ASM_DECLARE_OBJECT_NAME
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
do { \
const char *xname = NAME; \
if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \
xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \
if ((TREE_STATIC (DECL) \
&& (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
|| DECL_INITIAL (DECL)) \
machopic_define_name (xname); \
if ((TREE_STATIC (DECL) \
&& (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
|| DECL_INITIAL (DECL)) \
(* targetm.encode_section_info) (DECL, false); \
ASM_OUTPUT_LABEL (FILE, xname); \
} while (0)
#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
do { \
const char *xname = NAME; \
if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF) \
xname = IDENTIFIER_POINTER (DECL_NAME (DECL)); \
if ((TREE_STATIC (DECL) \
&& (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
|| DECL_INITIAL (DECL)) \
machopic_define_name (xname); \
if ((TREE_STATIC (DECL) \
&& (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
|| DECL_INITIAL (DECL)) \
(* targetm.encode_section_info) (DECL, false); \
ASM_OUTPUT_LABEL (FILE, xname); \
/* Avoid generating stubs for functions we've just defined by \
outputting any required stub name label now. */ \
machopic_output_possible_stub_label (FILE, xname); \
} while (0)
/* Wrap new method names in quotes so the assembler doesn't gag.
Make Objective-C internal symbols local. */
#undef ASM_OUTPUT_LABELREF
#define ASM_OUTPUT_LABELREF(FILE,NAME) \
do { \
const char *xname = darwin_strip_name_encoding (NAME); \
if (xname[0] == '&' || xname[0] == '*') \
{ \
int len = strlen (xname); \
if (len > 6 && !strcmp ("$stub", xname + len - 5)) \
machopic_validate_stub_or_non_lazy_ptr (xname, 1); \
else if (len > 7 && !strcmp ("$stub\"", xname + len - 6)) \
machopic_validate_stub_or_non_lazy_ptr (xname, 1); \
else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
machopic_validate_stub_or_non_lazy_ptr (xname, 0); \
fputs (&xname[1], FILE); \
} \
else if (xname[0] == '+' || xname[0] == '-') \
fprintf (FILE, "\"%s\"", xname); \
else if (!strncmp (xname, "_OBJC_", 6)) \
fprintf (FILE, "L%s", xname); \
else if (!strncmp (xname, ".objc_class_name_", 17)) \
fprintf (FILE, "%s", xname); \
else \
fprintf (FILE, "_%s", xname); \
} while (0)
/* Output before executable code. */
#undef TEXT_SECTION_ASM_OP
#define TEXT_SECTION_ASM_OP ".text"
/* Output before writable data. */
#undef DATA_SECTION_ASM_OP
#define DATA_SECTION_ASM_OP ".data"
#undef ALIGN_ASM_OP
#define ALIGN_ASM_OP ".align"
#undef ASM_OUTPUT_ALIGN
#define ASM_OUTPUT_ALIGN(FILE,LOG) \
if ((LOG) != 0) \
fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
/* Ensure correct alignment of bss data. */
#undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
do { \
fputs (".lcomm ", (FILE)); \
assemble_name ((FILE), (NAME)); \
fprintf ((FILE), ",%u,%u\n", (SIZE), \
floor_log2 ((ALIGN) / BITS_PER_UNIT)); \
if ((DECL) && ((TREE_STATIC (DECL) \
&& (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
|| DECL_INITIAL (DECL))) \
(* targetm.encode_section_info) (DECL, false); \
if ((DECL) && ((TREE_STATIC (DECL) \
&& (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL))) \
|| DECL_INITIAL (DECL))) \
machopic_define_name (NAME); \
} while (0)
/* The maximum alignment which the object file format can support.
For Mach-O, this is 2^15. */
#undef MAX_OFILE_ALIGNMENT
#define MAX_OFILE_ALIGNMENT 0x8000
/* Create new Mach-O sections. */
#undef SECTION_FUNCTION
#define SECTION_FUNCTION(FUNCTION, SECTION, DIRECTIVE, OBJC) \
extern void FUNCTION PARAMS ((void)); \
void \
FUNCTION () \
{ \
if (in_section != SECTION) \
{ \
if (OBJC) \
objc_section_init (); \
data_section (); \
if (asm_out_file) \
fprintf (asm_out_file, "%s\n", DIRECTIVE); \
in_section = SECTION; \
} \
} \
/* Darwin uses many types of special sections. */
#undef EXTRA_SECTIONS
#define EXTRA_SECTIONS \
in_const, in_const_data, in_cstring, in_literal4, in_literal8, \
in_constructor, in_destructor, in_mod_init, in_mod_term, \
in_objc_class, in_objc_meta_class, in_objc_category, \
in_objc_class_vars, in_objc_instance_vars, \
in_objc_cls_meth, in_objc_inst_meth, \
in_objc_cat_cls_meth, in_objc_cat_inst_meth, \
in_objc_selector_refs, \
in_objc_selector_fixup, \
in_objc_symbols, in_objc_module_info, \
in_objc_protocol, in_objc_string_object, \
in_objc_constant_string_object, \
in_objc_class_names, in_objc_meth_var_names, \
in_objc_meth_var_types, in_objc_cls_refs, \
in_machopic_nl_symbol_ptr, \
in_machopic_lazy_symbol_ptr, \
in_machopic_symbol_stub, \
in_machopic_picsymbol_stub, \
in_darwin_exception, in_darwin_eh_frame, \
num_sections
#undef EXTRA_SECTION_FUNCTIONS
#define EXTRA_SECTION_FUNCTIONS \
static void objc_section_init PARAMS ((void)); \
SECTION_FUNCTION (const_section, \
in_const, \
".const", 0) \
SECTION_FUNCTION (const_data_section, \
in_const_data, \
".const_data", 0) \
SECTION_FUNCTION (cstring_section, \
in_cstring, \
".cstring", 0) \
SECTION_FUNCTION (literal4_section, \
in_literal4, \
".literal4", 0) \
SECTION_FUNCTION (literal8_section, \
in_literal8, \
".literal8", 0) \
SECTION_FUNCTION (constructor_section, \
in_constructor, \
".constructor", 0) \
SECTION_FUNCTION (mod_init_section, \
in_mod_init, \
".mod_init_func", 0) \
SECTION_FUNCTION (mod_term_section, \
in_mod_term, \
".mod_term_func", 0) \
SECTION_FUNCTION (destructor_section, \
in_destructor, \
".destructor", 0) \
SECTION_FUNCTION (objc_class_section, \
in_objc_class, \
".objc_class", 1) \
SECTION_FUNCTION (objc_meta_class_section, \
in_objc_meta_class, \
".objc_meta_class", 1) \
SECTION_FUNCTION (objc_category_section, \
in_objc_category, \
".objc_category", 1) \
SECTION_FUNCTION (objc_class_vars_section, \
in_objc_class_vars, \
".objc_class_vars", 1) \
SECTION_FUNCTION (objc_instance_vars_section, \
in_objc_instance_vars, \
".objc_instance_vars", 1) \
SECTION_FUNCTION (objc_cls_meth_section, \
in_objc_cls_meth, \
".objc_cls_meth", 1) \
SECTION_FUNCTION (objc_inst_meth_section, \
in_objc_inst_meth, \
".objc_inst_meth", 1) \
SECTION_FUNCTION (objc_cat_cls_meth_section, \
in_objc_cat_cls_meth, \
".objc_cat_cls_meth", 1) \
SECTION_FUNCTION (objc_cat_inst_meth_section, \
in_objc_cat_inst_meth, \
".objc_cat_inst_meth", 1) \
SECTION_FUNCTION (objc_selector_refs_section, \
in_objc_selector_refs, \
".objc_message_refs", 1) \
SECTION_FUNCTION (objc_selector_fixup_section, \
in_objc_selector_fixup, \
".section __OBJC, __sel_fixup", 1) \
SECTION_FUNCTION (objc_symbols_section, \
in_objc_symbols, \
".objc_symbols", 1) \
SECTION_FUNCTION (objc_module_info_section, \
in_objc_module_info, \
".objc_module_info", 1) \
SECTION_FUNCTION (objc_protocol_section, \
in_objc_protocol, \
".objc_protocol", 1) \
SECTION_FUNCTION (objc_string_object_section, \
in_objc_string_object, \
".objc_string_object", 1) \
SECTION_FUNCTION (objc_constant_string_object_section, \
in_objc_constant_string_object, \
".section __OBJC, __cstring_object", 1) \
SECTION_FUNCTION (objc_class_names_section, \
in_objc_class_names, \
".objc_class_names", 1) \
SECTION_FUNCTION (objc_meth_var_names_section, \
in_objc_meth_var_names, \
".objc_meth_var_names", 1) \
SECTION_FUNCTION (objc_meth_var_types_section, \
in_objc_meth_var_types, \
".objc_meth_var_types", 1) \
SECTION_FUNCTION (objc_cls_refs_section, \
in_objc_cls_refs, \
".objc_cls_refs", 1) \
\
SECTION_FUNCTION (machopic_lazy_symbol_ptr_section, \
in_machopic_lazy_symbol_ptr, \
".lazy_symbol_pointer", 0) \
SECTION_FUNCTION (machopic_nl_symbol_ptr_section, \
in_machopic_nl_symbol_ptr, \
".non_lazy_symbol_pointer", 0) \
SECTION_FUNCTION (machopic_symbol_stub_section, \
in_machopic_symbol_stub, \
".symbol_stub", 0) \
SECTION_FUNCTION (machopic_picsymbol_stub_section, \
in_machopic_picsymbol_stub, \
".picsymbol_stub", 0) \
SECTION_FUNCTION (darwin_exception_section, \
in_darwin_exception, \
".section __DATA,__gcc_except_tab", 0) \
SECTION_FUNCTION (darwin_eh_frame_section, \
in_darwin_eh_frame, \
".section __TEXT,__eh_frame", 0) \
\
static void \
objc_section_init () \
{ \
static int been_here = 0; \
\
if (been_here == 0) \
{ \
been_here = 1; \
/* 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 (); \
} \
}
#define READONLY_DATA_SECTION const_section
#undef TARGET_ASM_SELECT_SECTION
#define TARGET_ASM_SELECT_SECTION machopic_select_section
#undef TARGET_ASM_SELECT_RTX_SECTION
#define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
#define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME) \
do { \
if (FILE) { \
if (flag_pic) \
fprintf (FILE, "\t.lazy_reference "); \
else \
fprintf (FILE, "\t.reference "); \
assemble_name (FILE, NAME); \
fprintf (FILE, "\n"); \
} \
} while (0)
#define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME) \
do { \
if (FILE) { \
fprintf (FILE, "\t"); \
assemble_name (FILE, NAME); \
fprintf (FILE, "=0\n"); \
(*targetm.asm_out.globalize_label) (FILE, NAME); \
} \
} while (0)
/* Globalizing directive for a label. */
#define GLOBAL_ASM_OP ".globl "
#define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
#undef ASM_GENERATE_INTERNAL_LABEL
#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
/* This is how to output an internal numbered label where PREFIX is
the class of label and NUM is the number within the class. */
#undef ASM_OUTPUT_INTERNAL_LABEL
#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
fprintf (FILE, "%s%d:\n", PREFIX, NUM)
/* Since we have a separate readonly data section, define this so that
jump tables end up in text rather than data. */
#ifndef JUMP_TABLES_IN_TEXT_SECTION
#define JUMP_TABLES_IN_TEXT_SECTION 1
#endif
/* Symbolic names for various things we might know about a symbol. */
enum machopic_addr_class {
MACHOPIC_UNDEFINED,
MACHOPIC_DEFINED_DATA,
MACHOPIC_UNDEFINED_DATA,
MACHOPIC_DEFINED_FUNCTION,
MACHOPIC_UNDEFINED_FUNCTION
};
/* Macros defining the various PIC cases. */
#define MACHOPIC_INDIRECT (flag_pic)
#define MACHOPIC_JUST_INDIRECT (flag_pic == 1)
#define MACHOPIC_PURE (flag_pic == 2)
#undef TARGET_ENCODE_SECTION_INFO
#define TARGET_ENCODE_SECTION_INFO darwin_encode_section_info
#undef TARGET_STRIP_NAME_ENCODING
#define TARGET_STRIP_NAME_ENCODING darwin_strip_name_encoding
#define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH) \
do { \
const char *const stub_ = (STUB); \
char *buffer_ = (BUF); \
strcpy (buffer_, stub_); \
if (stub_[0] == '"') \
{ \
strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\""); \
} \
else \
{ \
strcpy (buffer_ + (STUB_LENGTH), "_binder"); \
} \
} while (0)
#define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
do { \
const char *const symbol_ = (SYMBOL); \
char *buffer_ = (BUF); \
if (name_needs_quotes (symbol_) && symbol_[0] != '"') \
{ \
sprintf (buffer_, "\"%s\"", symbol_); \
} \
else \
{ \
strcpy (buffer_, symbol_); \
} \
} while (0)
/* Given a symbol name string, create the lazy pointer version
of the symbol name. */
#define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH) \
do { \
const char *symbol_ = darwin_strip_name_encoding (SYMBOL); \
char *buffer_ = (BUF); \
if (symbol_[0] == '"') \
{ \
strcpy (buffer_, "\"L"); \
strcpy (buffer_ + 2, symbol_ + 1); \
strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\""); \
} \
else if (name_needs_quotes (symbol_)) \
{ \
strcpy (buffer_, "\"L"); \
strcpy (buffer_ + 2, symbol_); \
strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\""); \
} \
else \
{ \
strcpy (buffer_, "L"); \
strcpy (buffer_ + 1, symbol_); \
strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr"); \
} \
} while (0)
#define TARGET_ASM_EXCEPTION_SECTION darwin_exception_section
#define TARGET_ASM_EH_FRAME_SECTION darwin_eh_frame_section
#undef ASM_PREFERRED_EH_DATA_FORMAT
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
(((CODE) == 2 && (GLOBAL) == 1) \
? (DW_EH_PE_pcrel | DW_EH_PE_indirect) : \
((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
#define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2) \
darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
#define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
#define DARWIN_REGISTER_TARGET_PRAGMAS(PFILE) \
do { \
cpp_register_pragma (PFILE, 0, "mark", darwin_pragma_ignore); \
cpp_register_pragma (PFILE, 0, "options", darwin_pragma_options); \
cpp_register_pragma (PFILE, 0, "segment", darwin_pragma_ignore); \
cpp_register_pragma (PFILE, 0, "unused", darwin_pragma_unused); \
} while (0)
#undef ASM_APP_ON
#define ASM_APP_ON ""
#undef ASM_APP_OFF
#define ASM_APP_OFF ""
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