sysv4.h

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

/* Define this to set the endianness to use in libgcc2.c, which can
   not depend on target_flags.  */
#if !defined(__LITTLE_ENDIAN__) && !defined(__sun__)
#define LIBGCC2_WORDS_BIG_ENDIAN 1
#else
#define LIBGCC2_WORDS_BIG_ENDIAN 0
#endif

/* Define cutoff for using external functions to save floating point.
   Currently on V.4, always use inline stores.  */
#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)

/* Put jump tables in read-only memory, rather than in .text.  */
#define JUMP_TABLES_IN_TEXT_SECTION 0

/* Prefix and suffix to use to saving floating point.  */
#define	SAVE_FP_PREFIX "_savefpr_"
#define SAVE_FP_SUFFIX "_l"

/* Prefix and suffix to use to restoring floating point.  */
#define	RESTORE_FP_PREFIX "_restfpr_"
#define RESTORE_FP_SUFFIX "_l"

/* Type used for ptrdiff_t, as a string used in a declaration.  */
#define PTRDIFF_TYPE "int"

/* Type used for wchar_t, as a string used in a declaration.  */
/* Override svr4.h definition.  */
#undef	WCHAR_TYPE
#define WCHAR_TYPE "long int"

/* Width of wchar_t in bits.  */
/* Override svr4.h definition.  */
#undef	WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 32

/* Make int foo : 8 not cause structures to be aligned to an int boundary.  */
/* Override elfos.h definition.  */
#undef	PCC_BITFIELD_TYPE_MATTERS
#define	PCC_BITFIELD_TYPE_MATTERS (TARGET_BITFIELD_TYPE)

#undef	BITFIELD_NBYTES_LIMITED
#define	BITFIELD_NBYTES_LIMITED (TARGET_NO_BITFIELD_WORD)

/* Define this macro to be the value 1 if instructions will fail to
   work if given data not on the nominal alignment.  If instructions
   will merely go slower in that case, define this macro as 0.  */
#undef	STRICT_ALIGNMENT
#define	STRICT_ALIGNMENT (TARGET_STRICT_ALIGN)

/* Define this macro if you wish to preserve a certain alignment for
   the stack pointer, greater than what the hardware enforces.  The
   definition is a C expression for the desired alignment (measured
   in bits).  This macro must evaluate to a value equal to or larger
   than STACK_BOUNDARY.
   For the SYSV ABI and variants the alignment of the stack pointer
   is usually controlled manually in rs6000.c. However, to maintain
   alignment across alloca () in all circumstances,
   PREFERRED_STACK_BOUNDARY needs to be set as well.
   This has the additional advantage of allowing a bigger maximum
   alignment of user objects on the stack.  */

#undef PREFERRED_STACK_BOUNDARY
#define PREFERRED_STACK_BOUNDARY 128

/* Real stack boundary as mandated by the appropriate ABI.  */
#define ABI_STACK_BOUNDARY \
  ((TARGET_EABI && !TARGET_ALTIVEC && !TARGET_ALTIVEC_ABI) ? 64 : 128)

/* An expression for the alignment of a structure field FIELD if the
   alignment computed in the usual way is COMPUTED.  */
#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED)				      \
	((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
	 ? 128 : COMPUTED)

/* Define this macro as an expression for the alignment of a type
   (given by TYPE as a tree node) if the alignment computed in the
   usual way is COMPUTED and the alignment explicitly specified was
   SPECIFIED.  */
#define ROUND_TYPE_ALIGN(TYPE, COMPUTED, SPECIFIED)			\
	((TARGET_ALTIVEC  && TREE_CODE (TYPE) == VECTOR_TYPE)		\
	 ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)			\
	 : MAX (COMPUTED, SPECIFIED))

#undef  BIGGEST_FIELD_ALIGNMENT

/* Use ELF style section commands.  */

#define	TEXT_SECTION_ASM_OP	"\t.section\t\".text\""

#define	DATA_SECTION_ASM_OP	"\t.section\t\".data\""

#define	BSS_SECTION_ASM_OP	"\t.section\t\".bss\""

/* APPLE LOCAL begin hot/cold partitioning  */
#define HOT_TEXT_SECTION_NAME ".text"
#define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
/* APPLE LOCAL end hot/cold partitioning  */

/* Override elfos.h definition.  */
#undef	INIT_SECTION_ASM_OP
#define	INIT_SECTION_ASM_OP "\t.section\t\".init\",\"ax\""

/* Override elfos.h definition.  */
#undef	FINI_SECTION_ASM_OP
#define	FINI_SECTION_ASM_OP "\t.section\t\".fini\",\"ax\""

#define	TOC_SECTION_ASM_OP "\t.section\t\".got\",\"aw\""

/* Put PC relative got entries in .got2.  */
#define	MINIMAL_TOC_SECTION_ASM_OP \
  (TARGET_RELOCATABLE || (flag_pic && DEFAULT_ABI != ABI_AIX)		\
   ? "\t.section\t\".got2\",\"aw\"" : "\t.section\t\".got1\",\"aw\"")

#define	SDATA_SECTION_ASM_OP "\t.section\t\".sdata\",\"aw\""
#define	SDATA2_SECTION_ASM_OP "\t.section\t\".sdata2\",\"a\""
#define	SBSS_SECTION_ASM_OP "\t.section\t\".sbss\",\"aw\",@nobits"

/* Besides the usual ELF sections, we need a toc section.  */
/* Override elfos.h definition.  */
#undef	EXTRA_SECTIONS
#define	EXTRA_SECTIONS in_toc, in_sdata, in_sdata2, in_sbss, in_init, in_fini

/* Override elfos.h definition.  */
#undef	EXTRA_SECTION_FUNCTIONS
#define	EXTRA_SECTION_FUNCTIONS						\
  TOC_SECTION_FUNCTION							\
  SDATA_SECTION_FUNCTION						\
  SDATA2_SECTION_FUNCTION						\
  SBSS_SECTION_FUNCTION							\
  INIT_SECTION_FUNCTION							\
  FINI_SECTION_FUNCTION

#define	TOC_SECTION_FUNCTION						\
void									\
toc_section (void)							\
{									\
  if (in_section != in_toc)						\
    {									\
      in_section = in_toc;						\
      if (DEFAULT_ABI == ABI_AIX					\
	  && TARGET_MINIMAL_TOC						\
	  && !TARGET_RELOCATABLE)					\
	{								\
	  if (! toc_initialized)					\
	    {								\
	      toc_initialized = 1;					\
	      fprintf (asm_out_file, "%s\n", TOC_SECTION_ASM_OP);	\
	      (*targetm.asm_out.internal_label) (asm_out_file, "LCTOC", 0); \
	      fprintf (asm_out_file, "\t.tc ");				\
	      ASM_OUTPUT_INTERNAL_LABEL_PREFIX (asm_out_file, "LCTOC1[TC],"); \
	      ASM_OUTPUT_INTERNAL_LABEL_PREFIX (asm_out_file, "LCTOC1"); \
	      fprintf (asm_out_file, "\n");				\
									\
	      fprintf (asm_out_file, "%s\n", MINIMAL_TOC_SECTION_ASM_OP); \
	      ASM_OUTPUT_INTERNAL_LABEL_PREFIX (asm_out_file, "LCTOC1"); \
	      fprintf (asm_out_file, " = .+32768\n");			\
	    }								\
	  else								\
	    fprintf (asm_out_file, "%s\n", MINIMAL_TOC_SECTION_ASM_OP);	\
	}								\
      else if (DEFAULT_ABI == ABI_AIX && !TARGET_RELOCATABLE)		\
	fprintf (asm_out_file, "%s\n", TOC_SECTION_ASM_OP);		\
      else								\
	{								\
	  fprintf (asm_out_file, "%s\n", MINIMAL_TOC_SECTION_ASM_OP);	\
	  if (! toc_initialized)					\
	    {								\
	      ASM_OUTPUT_INTERNAL_LABEL_PREFIX (asm_out_file, "LCTOC1"); \
	      fprintf (asm_out_file, " = .+32768\n");			\
	      toc_initialized = 1;					\
	    }								\
	}								\
    }									\
}									\
									\
extern int in_toc_section (void);					\
int in_toc_section (void)						\
{									\
  return in_section == in_toc;						\
}

#define	SDATA_SECTION_FUNCTION						\
void									\
sdata_section (void)							\
{									\
  if (in_section != in_sdata)						\
    {									\
      in_section = in_sdata;						\
      fprintf (asm_out_file, "%s\n", SDATA_SECTION_ASM_OP);		\
    }									\
}

#define	SDATA2_SECTION_FUNCTION						\
void									\
sdata2_section (void)							\
{									\
  if (in_section != in_sdata2)						\
    {									\
      in_section = in_sdata2;						\
      fprintf (asm_out_file, "%s\n", SDATA2_SECTION_ASM_OP);		\
    }									\
}

#define	SBSS_SECTION_FUNCTION						\
void									\
sbss_section (void)							\
{									\
  if (in_section != in_sbss)						\
    {									\
      in_section = in_sbss;						\
      fprintf (asm_out_file, "%s\n", SBSS_SECTION_ASM_OP);		\
    }									\
}

#define	INIT_SECTION_FUNCTION						\
void									\
init_section (void)							\
{									\
  if (in_section != in_init)						\
    {									\
      in_section = in_init;						\
      fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP);		\
    }									\
}

#define	FINI_SECTION_FUNCTION						\
void									\
fini_section (void)							\
{									\
  if (in_section != in_fini)						\
    {									\
      in_section = in_fini;						\
      fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP);		\
    }									\
}

/* Override default elf definitions.  */
#undef	TARGET_ASM_SELECT_RTX_SECTION
#define	TARGET_ASM_SELECT_RTX_SECTION rs6000_elf_select_rtx_section
#undef	TARGET_ASM_SELECT_SECTION
#define	TARGET_ASM_SELECT_SECTION  rs6000_elf_select_section
#define TARGET_ASM_UNIQUE_SECTION  rs6000_elf_unique_section

/* Return nonzero if this entry is to be written into the constant pool
   in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF or a CONST
   containing one of them.  If -mfp-in-toc (the default), we also do
   this for floating-point constants.  We actually can only do this
   if the FP formats of the target and host machines are the same, but
   we can't check that since not every file that uses
   GO_IF_LEGITIMATE_ADDRESS_P includes real.h.

   Unlike AIX, we don't key off of -mminimal-toc, but instead do not
   allow floating point constants in the TOC if -mrelocatable.  */

#undef	ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
#define	ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)			\
  (TARGET_TOC								\
   && (GET_CODE (X) == SYMBOL_REF					\
       || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS	\
	   && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)		\
       || GET_CODE (X) == LABEL_REF					\
       || (GET_CODE (X) == CONST_INT 					\
	   && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))	\
       || (!TARGET_NO_FP_IN_TOC						\
	   && !TARGET_RELOCATABLE					\
	   && GET_CODE (X) == CONST_DOUBLE				\
	   && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT		\
	   && BITS_PER_WORD == HOST_BITS_PER_INT)))

/* These macros generate the special .type and .size directives which
   are used to set the corresponding fields of the linker symbol table
   entries in an ELF object file under SVR4.  These macros also output
   the starting labels for the relevant functions/objects.  */

/* Write the extra assembler code needed to declare a function properly.
   Some svr4 assemblers need to also have something extra said about the
   function's return value.  We allow for that here.  */

extern int rs6000_pic_labelno;

/* Override elfos.h definition.  */
#undef	ASM_DECLARE_FUNCTION_NAME
#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
  rs6000_elf_declare_function_name ((FILE), (NAME), (DECL))

/* The USER_LABEL_PREFIX stuff is affected by the -fleading-underscore
   flag.  The LOCAL_LABEL_PREFIX variable is used by dbxelf.h.  */

#define	LOCAL_LABEL_PREFIX "."
#define	USER_LABEL_PREFIX ""

/* svr4.h overrides (*targetm.asm_out.internal_label).  */

#define	ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)	\
  asm_fprintf (FILE, "%L%s", PREFIX)

/* Globalizing directive for a label.  */
#define GLOBAL_ASM_OP "\t.globl "

/* This says how to output assembler code to declare an
   uninitialized internal linkage data object.  Under SVR4,
   the linker seems to want the alignment of data objects
   to depend on their types.  We do exactly that here.  */

#define	LOCAL_ASM_OP	"\t.local\t"

#define	LCOMM_ASM_OP	"\t.lcomm\t"

/* Override elfos.h definition.  */
#undef	ASM_OUTPUT_ALIGNED_LOCAL
#define	ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)		\
do {									\
  if (rs6000_sdata != SDATA_NONE && (SIZE) > 0				\
      && (SIZE) <= g_switch_value)					\
    {									\
      sbss_section ();							\
      ASM_OUTPUT_ALIGN (FILE, exact_log2 (ALIGN / BITS_PER_UNIT));	\
      ASM_OUTPUT_LABEL (FILE, NAME);					\
      ASM_OUTPUT_SKIP (FILE, SIZE);					\
      if (!flag_inhibit_size_directive && (SIZE) > 0)			\
	ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);			\
    }									\
  else									\
    {									\
      fprintf (FILE, "%s", LCOMM_ASM_OP);				\
      assemble_name ((FILE), (NAME));					\
      fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",		\
	       (SIZE), (ALIGN) / BITS_PER_UNIT);			\
    }									\
  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");			\
} while (0)

/* Describe how to emit uninitialized external linkage items.  */
#define	ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)		\
do {									\
  ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN);			\
} while (0)

#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
/* To support -falign-* switches we need to use .p2align so
   that alignment directives in code sections will be padded
   with no-op instructions, rather than zeroes.  */
#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)			\