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/****************************************************************************

 *                                                                          *

 *                         GNAT COMPILER COMPONENTS                         *

 *                                                                          *

 *                                 M I S C                                  *

 *                                                                          *

 *                           C Implementation File                          *

 *                                                                          *

 *          Copyright (C) 1992-2009, Free Software Foundation, Inc.         *

 *                                                                          *

 * GNAT is free software;  you can  redistribute it  and/or modify it under *

 * terms of the  GNU General Public License as published  by the Free Soft- *

 * ware  Foundation;  either version 3,  or (at your option) any later ver- *

 * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *

 * OUT 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  distributed  with GNAT;  see file  COPYING3.  If not see *

 * <http://www.gnu.org/licenses/>.                                          *

 *                                                                          *

 * GNAT was originally developed  by the GNAT team at  New York University. *

 * Extensive contributions were provided by Ada Core Technologies Inc.      *

 *                                                                          *

 ****************************************************************************/

/* This file contains parts of the compiler that are required for interfacing

   with GCC but otherwise do nothing and parts of Gigi that need to know

   about RTL.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "tree.h"

#include "diagnostic.h"

#include "target.h"

#include "expr.h"

#include "libfuncs.h"

#include "ggc.h"

#include "flags.h"

#include "debug.h"

#include "cgraph.h"

#include "optabs.h"

#include "toplev.h"

#include "except.h"

#include "langhooks.h"

#include "langhooks-def.h"

#include "opts.h"

#include "options.h"

#include "tree-inline.h"

#include "ada.h"

#include "adadecode.h"

#include "types.h"

#include "atree.h"

#include "elists.h"

#include "namet.h"

#include "nlists.h"

#include "stringt.h"

#include "uintp.h"

#include "fe.h"

#include "sinfo.h"

#include "einfo.h"

#include "ada-tree.h"

#include "gigi.h"

static bool gnat_init                   (void);

static unsigned int gnat_init_options   (unsigned int, const char **);

static int gnat_handle_option           (size_t, const char *, int);

static bool gnat_post_options           (const char **);

static alias_set_type gnat_get_alias_set (tree);

static void gnat_print_decl             (FILE *, tree, int);

static void gnat_print_type             (FILE *, tree, int);

static const char *gnat_printable_name  (tree, int);

static const char *gnat_dwarf_name      (tree, int);

static tree gnat_return_tree            (tree);

static int gnat_eh_type_covers          (tree, tree);

static void gnat_parse_file             (int);

static void internal_error_function     (const char *, va_list *);

static tree gnat_type_max_size          (const_tree);

static void gnat_get_subrange_bounds    (const_tree, tree *, tree *);

static tree gnat_eh_personality         (void);

/* Definitions for our language-specific hooks.  */

#undef  LANG_HOOKS_NAME

#define LANG_HOOKS_NAME                 "GNU Ada"

#undef  LANG_HOOKS_IDENTIFIER_SIZE

#define LANG_HOOKS_IDENTIFIER_SIZE      sizeof (struct tree_identifier)

#undef  LANG_HOOKS_INIT

#define LANG_HOOKS_INIT                 gnat_init

#undef  LANG_HOOKS_INIT_OPTIONS

#define LANG_HOOKS_INIT_OPTIONS         gnat_init_options

#undef  LANG_HOOKS_HANDLE_OPTION

#define LANG_HOOKS_HANDLE_OPTION        gnat_handle_option

#undef  LANG_HOOKS_POST_OPTIONS

#define LANG_HOOKS_POST_OPTIONS         gnat_post_options

#undef  LANG_HOOKS_PARSE_FILE

#define LANG_HOOKS_PARSE_FILE           gnat_parse_file

#undef  LANG_HOOKS_HASH_TYPES

#define LANG_HOOKS_HASH_TYPES           false

#undef  LANG_HOOKS_GETDECLS

#define LANG_HOOKS_GETDECLS             lhd_return_null_tree_v

#undef  LANG_HOOKS_PUSHDECL

#define LANG_HOOKS_PUSHDECL             gnat_return_tree

#undef  LANG_HOOKS_WRITE_GLOBALS

#define LANG_HOOKS_WRITE_GLOBALS        gnat_write_global_declarations

#undef  LANG_HOOKS_GET_ALIAS_SET

#define LANG_HOOKS_GET_ALIAS_SET        gnat_get_alias_set

#undef  LANG_HOOKS_PRINT_DECL

#define LANG_HOOKS_PRINT_DECL           gnat_print_decl

#undef  LANG_HOOKS_PRINT_TYPE

#define LANG_HOOKS_PRINT_TYPE           gnat_print_type

#undef  LANG_HOOKS_TYPE_MAX_SIZE

#define LANG_HOOKS_TYPE_MAX_SIZE        gnat_type_max_size

#undef  LANG_HOOKS_DECL_PRINTABLE_NAME

#define LANG_HOOKS_DECL_PRINTABLE_NAME  gnat_printable_name

#undef  LANG_HOOKS_DWARF_NAME

#define LANG_HOOKS_DWARF_NAME           gnat_dwarf_name

#undef  LANG_HOOKS_GIMPLIFY_EXPR

#define LANG_HOOKS_GIMPLIFY_EXPR        gnat_gimplify_expr

#undef  LANG_HOOKS_TYPE_FOR_MODE

#define LANG_HOOKS_TYPE_FOR_MODE        gnat_type_for_mode

#undef  LANG_HOOKS_TYPE_FOR_SIZE

#define LANG_HOOKS_TYPE_FOR_SIZE        gnat_type_for_size

#undef  LANG_HOOKS_TYPES_COMPATIBLE_P

#define LANG_HOOKS_TYPES_COMPATIBLE_P   gnat_types_compatible_p

#undef  LANG_HOOKS_GET_SUBRANGE_BOUNDS

#define LANG_HOOKS_GET_SUBRANGE_BOUNDS  gnat_get_subrange_bounds

#undef  LANG_HOOKS_ATTRIBUTE_TABLE

#define LANG_HOOKS_ATTRIBUTE_TABLE      gnat_internal_attribute_table

#undef  LANG_HOOKS_BUILTIN_FUNCTION

#define LANG_HOOKS_BUILTIN_FUNCTION     gnat_builtin_function

#undef  LANG_HOOKS_EH_PERSONALITY

#define LANG_HOOKS_EH_PERSONALITY       gnat_eh_personality

struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

/* How much we want of our DWARF extensions.  Some of our dwarf+ extensions

   are incompatible with regular GDB versions, so we must make sure to only

   produce them on explicit request.  This is eventually reflected into the

   use_gnu_debug_info_extensions common flag for later processing.  */

static int gnat_dwarf_extensions = 0;

/* Command-line argc and argv.  These variables are global

   since they are imported in back_end.adb.  */

unsigned int save_argc;

const char **save_argv;

/* GNAT argc and argv.  */

extern int gnat_argc;

extern char **gnat_argv;

/* Declare functions we use as part of startup.  */

extern void __gnat_initialize           (void *);

extern void __gnat_install_SEH_handler  (void *);

extern void adainit                     (void);

extern void _ada_gnat1drv               (void);

/* The parser for the language.  For us, we process the GNAT tree.  */

static void

gnat_parse_file (int set_yydebug ATTRIBUTE_UNUSED)

{

  int seh[2];

  /* Call the target specific initializations.  */

  __gnat_initialize (NULL);

  /* ??? Call the SEH initialization routine.  This is to workaround

  a bootstrap path problem.  The call below should be removed at some

  point and the SEH pointer passed to __gnat_initialize() above.  */

  __gnat_install_SEH_handler((void *)seh);

  /* Call the front-end elaboration procedures.  */

  adainit ();

  /* Call the front end.  */

  _ada_gnat1drv ();

}

/* Decode all the language specific options that cannot be decoded by GCC.

   The option decoding phase of GCC calls this routine on the flags that

   it cannot decode.  Return the number of consecutive arguments from ARGV

   that have been successfully decoded or 0 on failure.  */

static int

gnat_handle_option (size_t scode, const char *arg, int value)

{

  const struct cl_option *option = &cl_options[scode];

  enum opt_code code = (enum opt_code) scode;

  char *q;

  if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))

    {

      error ("missing argument to \"-%s\"", option->opt_text);

      return 1;

    }

  switch (code)

    {

    case OPT_I:

      q = XNEWVEC (char, sizeof("-I") + strlen (arg));

      strcpy (q, "-I");

      strcat (q, arg);

      gnat_argv[gnat_argc] = q;

      gnat_argc++;

      break;

    case OPT_Wall:

      warn_unused = value;

      /* We save the value of warn_uninitialized, since if they put

         -Wuninitialized on the command line, we need to generate a

         warning about not using it without also specifying -O.  */

      if (warn_uninitialized != 1)

        warn_uninitialized = (value ? 2 : 0);

      break;

      /* These are used in the GCC Makefile.  */

    case OPT_Wmissing_prototypes:

    case OPT_Wstrict_prototypes:

    case OPT_Wwrite_strings:

    case OPT_Wlong_long:

    case OPT_Wvariadic_macros:

    case OPT_Wold_style_definition:

    case OPT_Wmissing_format_attribute:

    case OPT_Woverlength_strings:

      break;

      /* This is handled by the front-end.  */

    case OPT_nostdinc:

      break;

    case OPT_nostdlib:

      gnat_argv[gnat_argc] = xstrdup ("-nostdlib");

      gnat_argc++;

      break;

    case OPT_feliminate_unused_debug_types:

      /* We arrange for post_option to be able to only set the corresponding

         flag to 1 when explicitly requested by the user.  We expect the

         default flag value to be either 0 or positive, and expose a positive

         -f as a negative value to post_option.  */

      flag_eliminate_unused_debug_types = -value;

      break;

    case OPT_fRTS_:

      gnat_argv[gnat_argc] = xstrdup ("-fRTS");

      gnat_argc++;

      break;

    case OPT_gant:

      warning (0, "%<-gnat%> misspelled as %<-gant%>");

      /* ... fall through ... */

    case OPT_gnat:

      /* Recopy the switches without the 'gnat' prefix.  */

      gnat_argv[gnat_argc] = XNEWVEC (char, strlen (arg) + 2);

      gnat_argv[gnat_argc][0] = '-';

      strcpy (gnat_argv[gnat_argc] + 1, arg);

      gnat_argc++;

      break;

    case OPT_gnatO:

      gnat_argv[gnat_argc] = xstrdup ("-O");

      gnat_argc++;

      gnat_argv[gnat_argc] = xstrdup (arg);

      gnat_argc++;

      break;

    case OPT_gdwarfplus:

      gnat_dwarf_extensions = 1;

      break;

    default:

      gcc_unreachable ();

    }

  return 1;

}

/* Initialize for option processing.  */

static unsigned int

gnat_init_options (unsigned int argc, const char **argv)

{

  /* Initialize gnat_argv with save_argv size.  */

  gnat_argv = (char **) xmalloc ((argc + 1) * sizeof (argv[0]));

  gnat_argv[0] = xstrdup (argv[0]);     /* name of the command */

  gnat_argc = 1;

  save_argc = argc;

  save_argv = argv;

  /* Uninitialized really means uninitialized in Ada.  */

  flag_zero_initialized_in_bss = 0;

  return CL_Ada;

}

/* Post-switch processing.  */

bool

gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED)

{

  /* Excess precision other than "fast" requires front-end

     support.  */

  if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD

      && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)

    sorry ("-fexcess-precision=standard for Ada");

  flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;

  /* ??? The warning machinery is outsmarted by Ada.  */

  warn_unused_parameter = 0;

  /* No psABI change warnings for Ada.  */

  warn_psabi = 0;

  /* Force eliminate_unused_debug_types to 0 unless an explicit positive

     -f has been passed.  This forces the default to 0 for Ada, which might

     differ from the common default.  */

  if (flag_eliminate_unused_debug_types < 0)

    flag_eliminate_unused_debug_types = 1;

  else

    flag_eliminate_unused_debug_types = 0;

  /* Reflect the explicit request of DWARF extensions into the common

     flag for use by later passes.  */

  if (write_symbols == DWARF2_DEBUG)

    use_gnu_debug_info_extensions = gnat_dwarf_extensions > 0;

  return false;

}

/* Here is the function to handle the compiler error processing in GCC.  */

static void

internal_error_function (const char *msgid, va_list *ap)

{

  text_info tinfo;

  char *buffer, *p, *loc;

  String_Template temp, temp_loc;

  Fat_Pointer fp, fp_loc;

  expanded_location s;

  /* Reset the pretty-printer.  */

  pp_clear_output_area (global_dc->printer);

  /* Format the message into the pretty-printer.  */

  tinfo.format_spec = msgid;

  tinfo.args_ptr = ap;

  tinfo.err_no = errno;

  pp_format_verbatim (global_dc->printer, &tinfo);

  /* Extract a (writable) pointer to the formatted text.  */

  buffer = xstrdup (pp_formatted_text (global_dc->printer));

  /* Go up to the first newline.  */

  for (p = buffer; *p; p++)

    if (*p == '\n')

      {

        *p = '\0';

        break;

      }

  temp.Low_Bound = 1;

  temp.High_Bound = p - buffer;

  fp.Bounds = &temp;

  fp.Array = buffer;

  s = expand_location (input_location);

  if (flag_show_column && s.column != 0)

    asprintf (&loc, "%s:%d:%d", s.file, s.line, s.column);

  else

    asprintf (&loc, "%s:%d", s.file, s.line);

  temp_loc.Low_Bound = 1;

  temp_loc.High_Bound = strlen (loc);

  fp_loc.Bounds = &temp_loc;

  fp_loc.Array = loc;

  Current_Error_Node = error_gnat_node;

  Compiler_Abort (fp, -1, fp_loc);

}

/* Perform all the initialization steps that are language-specific.  */

static bool

gnat_init (void)

{

  /* Performs whatever initialization steps needed by the language-dependent

     lexical analyzer.  */

  gnat_init_decl_processing ();

  /* Add the input filename as the last argument.  */

  if (main_input_filename)

    {

      gnat_argv[gnat_argc] = xstrdup (main_input_filename);

      gnat_argc++;

      gnat_argv[gnat_argc] = NULL;

    }

  global_dc->internal_error = &internal_error_function;

  /* Show that REFERENCE_TYPEs are internal and should be Pmode.  */

  internal_reference_types ();

  return true;

}

/* If we are using the GCC mechanism to process exception handling, we

   have to register the personality routine for Ada and to initialize

   various language dependent hooks.  */

void

gnat_init_gcc_eh (void)

{

#ifdef DWARF2_UNWIND_INFO

  /* lang_dependent_init already called dwarf2out_frame_init if true.  */

  int dwarf2out_frame_initialized = dwarf2out_do_frame ();

#endif

  /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,

     though. This could for instance lead to the emission of tables with

     references to symbols (such as the Ada eh personality routine) within

     libraries we won't link against.  */

  if (No_Exception_Handlers_Set ())

    return;

  /* Tell GCC we are handling cleanup actions through exception propagation.

     This opens possibilities that we don't take advantage of yet, but is

     nonetheless necessary to ensure that fixup code gets assigned to the

     right exception regions.  */

  using_eh_for_cleanups ();

  lang_eh_type_covers = gnat_eh_type_covers;

  /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers

     the generation of the necessary exception runtime tables. The second one

     is useful for two reasons: 1/ we map some asynchronous signals like SEGV

     to exceptions, so we need to ensure that the insns which can lead to such

     signals are correctly attached to the exception region they pertain to,

     2/ Some calls to pure subprograms are handled as libcall blocks and then

     marked as "cannot trap" if the flag is not set (see emit_libcall_block).

     We should not let this be since it is possible for such calls to actually

     raise in Ada.  */

  flag_exceptions = 1;

  flag_non_call_exceptions = 1;

  init_eh ();

#ifdef DWARF2_UNWIND_INFO

  if (!dwarf2out_frame_initialized && dwarf2out_do_frame ())

    dwarf2out_frame_init ();

#endif

}

/* Print language-specific items in declaration NODE.  */

static void

gnat_print_decl (FILE *file, tree node, int indent)

{

  switch (TREE_CODE (node))

    {

    case CONST_DECL:

      print_node (file, "corresponding var",

                  DECL_CONST_CORRESPONDING_VAR (node), indent + 4);

      break;

    case FIELD_DECL:

      print_node (file, "original field", DECL_ORIGINAL_FIELD (node),

                  indent + 4);

      break;

    case VAR_DECL:

      print_node (file, "renamed object", DECL_RENAMED_OBJECT (node),

                  indent + 4);

      break;

    default:

      break;

    }

}

/* Print language-specific items in type NODE.  */

static void

gnat_print_type (FILE *file, tree node, int indent)

{

  switch (TREE_CODE (node))

    {

    case FUNCTION_TYPE:

      print_node (file, "ci/co list", TYPE_CI_CO_LIST (node), indent + 4);

      break;

    case INTEGER_TYPE:

      if (TYPE_MODULAR_P (node))

        print_node_brief (file, "modulus", TYPE_MODULUS (node), indent + 4);

      else if (TYPE_HAS_ACTUAL_BOUNDS_P (node))

        print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node),

                    indent + 4);

      else if (TYPE_VAX_FLOATING_POINT_P (node))

        ;

      else

        print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4);

      /* ... fall through ... */

    case ENUMERAL_TYPE:

    case BOOLEAN_TYPE:

      print_node_brief (file, "RM size", TYPE_RM_SIZE (node), indent + 4);

      /* ... fall through ... */

    case REAL_TYPE:

      print_node_brief (file, "RM min", TYPE_RM_MIN_VALUE (node), indent + 4);

      print_node_brief (file, "RM max", TYPE_RM_MAX_VALUE (node), indent + 4);

      break;

    case ARRAY_TYPE:

      print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4);

      break;

    case VECTOR_TYPE:

      print_node (file,"representative array",

                  TYPE_REPRESENTATIVE_ARRAY (node), indent + 4);

      break;

    case RECORD_TYPE:

      if (TYPE_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node))

        print_node (file, "unconstrained array",

                    TYPE_UNCONSTRAINED_ARRAY (node), indent + 4);

      else

        print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);

      break;

    case UNION_TYPE:

    case QUAL_UNION_TYPE:

      print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);

      break;

    default:

      break;

    }

}

/* Return the name to be printed for DECL.  */

static const char *

gnat_printable_name (tree decl, int verbosity)

{

  const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl));

  char *ada_name = (char *) ggc_alloc (strlen (coded_name) * 2 + 60);

  __gnat_decode (coded_name, ada_name, 0);

  if (verbosity == 2 && !DECL_IS_BUILTIN (decl))

    {

      Set_Identifier_Casing (ada_name, DECL_SOURCE_FILE (decl));

      return ggc_strdup (Name_Buffer);

    }

  return ada_name;

}

/* Return the name to be used in DWARF debug info for DECL.  */

static const char *

gnat_dwarf_name (tree decl, int verbosity ATTRIBUTE_UNUSED)

{

  gcc_assert (DECL_P (decl));

  return (const char *) IDENTIFIER_POINTER (DECL_NAME (decl));

}

/* Do nothing (return the tree node passed).  */

static tree

gnat_return_tree (tree t)

{

  return t;

}

/* Return true if type A catches type B. Callback for flow analysis from

   the exception handling part of the back-end.  */

static int

gnat_eh_type_covers (tree a, tree b)

{

  /* a catches b if they represent the same exception id or if a

     is an "others".

     ??? integer_zero_node for "others" is hardwired in too many places

     currently.  */

  return (a == b || a == integer_zero_node);

}

/* Get the alias set corresponding to a type or expression.  */

static alias_set_type

gnat_get_alias_set (tree type)

{

  /* If this is a padding type, use the type of the first field.  */

  if (TYPE_IS_PADDING_P (type))

    return get_alias_set (TREE_TYPE (TYPE_FIELDS (type)));

  /* If the type is an unconstrained array, use the type of the

     self-referential array we make.  */

  else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)

    return

      get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))));

  /* If the type can alias any other types, return the alias set 0.  */

  else if (TYPE_P (type)

           && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type)))

    return 0;

  return -1;

}

/* GNU_TYPE is a type.  Return its maximum size in bytes, if known,

   as a constant when possible.  */

static tree

gnat_type_max_size (const_tree gnu_type)

{

  /* First see what we can get from TYPE_SIZE_UNIT, which might not

     be constant even for simple expressions if it has already been

     elaborated and possibly replaced by a VAR_DECL.  */

  tree max_unitsize = max_size (TYPE_SIZE_UNIT (gnu_type), true);

  /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,

     which should stay untouched.  */

  if (!host_integerp (max_unitsize, 1)

      && (TREE_CODE (gnu_type) == RECORD_TYPE

          || TREE_CODE (gnu_type) == UNION_TYPE

          || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)

      && TYPE_ADA_SIZE (gnu_type))

    {

      tree max_adasize = max_size (TYPE_ADA_SIZE (gnu_type), true);

      /* If we have succeeded in finding a constant, round it up to the

         type's alignment and return the result in units.  */

      if (host_integerp (max_adasize, 1))

        max_unitsize

          = size_binop (CEIL_DIV_EXPR,

                        round_up (max_adasize, TYPE_ALIGN (gnu_type)),

                        bitsize_unit_node);

    }

  return max_unitsize;

}

/* GNU_TYPE is a subtype of an integral type.  Set LOWVAL to the low bound

   and HIGHVAL to the high bound, respectively.  */

static void

gnat_get_subrange_bounds (const_tree gnu_type, tree *lowval, tree *highval)

{

  *lowval = TYPE_MIN_VALUE (gnu_type);

  *highval = TYPE_MAX_VALUE (gnu_type);

}

/* GNU_TYPE is a type. Determine if it should be passed by reference by

   default.  */

bool

default_pass_by_ref (tree gnu_type)

{

  /* We pass aggregates by reference if they are sufficiently large.  The

     choice of constant here is somewhat arbitrary.  We also pass by

     reference if the target machine would either pass or return by

     reference.  Strictly speaking, we need only check the return if this

     is an In Out parameter, but it's probably best to err on the side of

     passing more things by reference.  */

  if (pass_by_reference (NULL, TYPE_MODE (gnu_type), gnu_type, 1))

    return true;

  if (targetm.calls.return_in_memory (gnu_type, NULL_TREE))

    return true;

  if (AGGREGATE_TYPE_P (gnu_type)

      && (!host_integerp (TYPE_SIZE (gnu_type), 1)

          || 0 < compare_tree_int (TYPE_SIZE (gnu_type),

                                   8 * TYPE_ALIGN (gnu_type))))

    return true;

  return false;

}

/* GNU_TYPE is the type of a subprogram parameter.  Determine from the type if

   it should be passed by reference. */

bool

must_pass_by_ref (tree gnu_type)

{

  /* We pass only unconstrained objects, those required by the language

     to be passed by reference, and objects of variable size.  The latter

     is more efficient, avoids problems with variable size temporaries,

     and does not produce compatibility problems with C, since C does

     not have such objects.  */

  return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE

          || (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type))

          || (TYPE_SIZE (gnu_type)

              && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST));

}

/* This function is called by the front end to enumerate all the supported

   modes for the machine.  We pass a function which is called back with

   the following integer parameters:

   FLOAT_P      nonzero if this represents a floating-point mode

   COMPLEX_P    nonzero is this represents a complex mode

   COUNT        count of number of items, nonzero for vector mode

   PRECISION    number of bits in data representation

   MANTISSA     number of bits in mantissa, if FP and known, else zero.