gcc/config/ia64/vms.h

/* Definitions of target machine GNU compiler. IA64-VMS version.
   Copyright (C) 2003-2021 Free Software Foundation, Inc.
   Contributed by Douglas B Rupp (rupp@gnat.com).

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#define OBJECT_FORMAT_ELF

#define SUBTARGET_OS_CPP_BUILTINS()		\
    do {					\
	builtin_define ("__IA64");		\
	builtin_define ("__IEEE_FLOAT");	\
    } while (0)

/* Need .debug_line info generated from gcc and gas.  */
#undef TARGET_DEFAULT
#define TARGET_DEFAULT (MASK_DWARF2_ASM | MASK_GNU_AS)

#undef MAX_OFILE_ALIGNMENT
#define MAX_OFILE_ALIGNMENT 524288  /* 8 x 2^16 by DEC Ada Test CD40VRA */

/* Widest floating-point type efficiently supported by hardware and OS.  */
#undef WIDEST_HARDWARE_FP_SIZE
#define WIDEST_HARDWARE_FP_SIZE 64

/* The structure return address arrives as an "argument" on VMS.  */
#undef PCC_STATIC_STRUCT_RETURN

/* Turn on VMS specific Dwarf2 features.  */
#define VMS_DEBUGGING_INFO 1

#define ASM_OUTPUT_DWARF_VMS_DELTA(FILE,SIZE,LABEL1,LABEL2) \
do {                                          \
  fprintf (FILE, "\tdata4.ua\t@slotcount(");  \
  assemble_name (FILE, LABEL1);               \
  fprintf (FILE, "-");                        \
  assemble_name (FILE, LABEL2);               \
  fprintf (FILE, ")");                        \
} while (0)

#undef STARTFILE_SPEC
#define STARTFILE_SPEC "%{!shared:crt0.o%s crtbegin.o%s} \
 %{!static:%{shared:crtinitS.o%s crtbeginS.o%s}}"

#undef ENDFILE_SPEC
#define ENDFILE_SPEC "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"

#define LINK_GCC_C_SEQUENCE_SPEC "%G"

#undef LINK_SPEC
#define LINK_SPEC "%{g0} %{g*:-g} %{map} %{save-temps} %{shared} %{v}"

#undef LIB_SPEC
#define LIB_SPEC ""

#undef ASM_SPEC
#define ASM_SPEC \
"%{mno-gnu-as:-N so -N vms_upcase -W DVLoc_off} %{mconstant-gp:-M const_gp} \
 %{mauto-pic:-M no_plabel} %{source-listing:-ahdl=%b.lis}"

#undef ASM_OUTPUT_EXTERNAL_LIBCALL
#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)			\
do {								\
  (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0));	\
  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, XSTR (FUN, 0), "function");	\
} while (0)

/* Set the function to change the names of the division and modulus
   functions.   */
#undef TARGET_INIT_LIBFUNCS
#define TARGET_INIT_LIBFUNCS ia64_vms_init_libfuncs

#define CTOR_LIST_BEGIN asm (".global\tLIB$INITIALIZE#\n");                  \
STATIC func_ptr __CTOR_LIST__[1]                                             \
  __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr)))) \
  = { (func_ptr) (-1) };

#undef INIT_SECTION_ASM_OP
#define INIT_SECTION_ASM_OP ".section\tLIB$INITIALIZE#,\"a\",@progbits"

#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
  asm (SECTION_OP "\n\tdata4 @fptr(" #FUNC"#)\n");      \
  FORCE_CODE_SECTION_ALIGN                            \
  asm (TEXT_SECTION_ASM_OP);

#undef FINI_SECTION_ASM_OP

/* Maybe same as HPUX?  Needs to be checked.  */
#define JMP_BUF_SIZE  (8 * 76)

#undef SUBTARGET_OPTIMIZATION_OPTIONS
#define SUBTARGET_OPTIMIZATION_OPTIONS			\
  { OPT_LEVELS_ALL, OPT_fmerge_constants, NULL, 0 }

/* Define this to be nonzero if static stack checking is supported.  */
#define STACK_CHECK_STATIC_BUILTIN 1

/* Minimum amount of stack required to recover from an anticipated stack
   overflow detection.  The default value conveys an estimate of the amount
   of stack required to propagate an exception.  */
#define STACK_CHECK_PROTECT (24 * 1024)

#undef ASM_OUTPUT_ALIGNED_DECL_COMMON
#define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
  ia64_vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)

#undef TARGET_VALID_POINTER_MODE
#define TARGET_VALID_POINTER_MODE ia64_vms_valid_pointer_mode

/* Define this macro if it is advisable to hold scalars in registers
   in a wider mode than that declared by the program.  In such cases,
   the value is constrained to be within the bounds of the declared
   type, but kept valid in the wider mode.  The signedness of the
   extension may differ from that of the type.

   For ia64, we always store objects in a full register.  32-bit integers
   are always sign-extended, but smaller objects retain their signedness.  */

#undef PROMOTE_MODE
#define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)			\
  if (GET_MODE_CLASS (MODE) == MODE_INT				\
      && GET_MODE_SIZE (MODE) < UNITS_PER_WORD)			\
    {								\
      if ((MODE) == SImode)					\
	(UNSIGNEDP) = 0;					\
      (MODE) = DImode;						\
    }

#undef TARGET_PROMOTE_FUNCTION_MODE
#define TARGET_PROMOTE_FUNCTION_MODE default_promote_function_mode_always_promote

/* Code is always in P0/P1 (lower 32 bit addresses) on VMS.  */
#undef CASE_VECTOR_MODE
#define CASE_VECTOR_MODE SImode

/* IA64 VMS doesn't fully support COMDAT sections.  */

#define SUPPORTS_ONE_ONLY 0

/* Default values for _CRTL_VER and _VMS_VER.  */
#define VMS_DEFAULT_CRTL_VER 80300000
#define VMS_DEFAULT_VMS_VER 80300000