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gcc/rust/backend/rust-compile-resolve-path.cc

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gcc/rust/hir/rust-hir-dump.cc

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gcc/testsuite/rust/compile/issue-3552.rs

3 files changed, 38 insertions, 1 deletions

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/****************************************************************************
 *                                                                          *
 *                         GNAT COMPILER COMPONENTS                         *
 *                                                                          *
 *                                U T I L S                                 *
 *                                                                          *
 *                          C Implementation File                           *
 *                                                                          *
 *          Copyright (C) 1992-2015, 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 along with GCC; see the 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.      *
 *                                                                          *
 ****************************************************************************/

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "hash-set.h"
#include "machmode.h"
#include "vec.h"
#include "double-int.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "wide-int.h"
#include "inchash.h"
#include "tree.h"
#include "fold-const.h"
#include "stringpool.h"
#include "stor-layout.h"
#include "attribs.h"
#include "varasm.h"
#include "flags.h"
#include "toplev.h"
#include "diagnostic-core.h"
#include "output.h"
#include "ggc.h"
#include "debug.h"
#include "convert.h"
#include "target.h"
#include "common/common-target.h"
#include "langhooks.h"
#include "hash-map.h"
#include "is-a.h"
#include "plugin-api.h"
#include "hard-reg-set.h"
#include "input.h"
#include "function.h"
#include "ipa-ref.h"
#include "cgraph.h"
#include "diagnostic.h"
#include "timevar.h"
#include "tree-dump.h"
#include "tree-inline.h"
#include "tree-iterator.h"

#include "ada.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"

/* If nonzero, pretend we are allocating at global level.  */
int force_global;

/* The default alignment of "double" floating-point types, i.e. floating
   point types whose size is equal to 64 bits, or 0 if this alignment is
   not specifically capped.  */
int double_float_alignment;

/* The default alignment of "double" or larger scalar types, i.e. scalar
   types whose size is greater or equal to 64 bits, or 0 if this alignment
   is not specifically capped.  */
int double_scalar_alignment;

/* True if floating-point arithmetics may use wider intermediate results.  */
bool fp_arith_may_widen = true;

/* Tree nodes for the various types and decls we create.  */
tree gnat_std_decls[(int) ADT_LAST];

/* Functions to call for each of the possible raise reasons.  */
tree gnat_raise_decls[(int) LAST_REASON_CODE + 1];

/* Likewise, but with extra info for each of the possible raise reasons.  */
tree gnat_raise_decls_ext[(int) LAST_REASON_CODE + 1];

/* Forward declarations for handlers of attributes.  */
static tree handle_const_attribute (tree *, tree, tree, int, bool *);
static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
static tree handle_pure_attribute (tree *, tree, tree, int, bool *);
static tree handle_novops_attribute (tree *, tree, tree, int, bool *);
static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
static tree handle_leaf_attribute (tree *, tree, tree, int, bool *);
static tree handle_always_inline_attribute (tree *, tree, tree, int, bool *);
static tree handle_malloc_attribute (tree *, tree, tree, int, bool *);
static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
static tree handle_vector_size_attribute (tree *, tree, tree, int, bool *);
static tree handle_vector_type_attribute (tree *, tree, tree, int, bool *);

/* Fake handler for attributes we don't properly support, typically because
   they'd require dragging a lot of the common-c front-end circuitry.  */
static tree fake_attribute_handler      (tree *, tree, tree, int, bool *);

/* Table of machine-independent internal attributes for Ada.  We support
   this minimal set of attributes to accommodate the needs of builtins.  */
const struct attribute_spec gnat_internal_attribute_table[] =
{
  /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
       affects_type_identity } */
  { "const",        0, 0,  true,  false, false, handle_const_attribute,
    false },
  { "nothrow",      0, 0,  true,  false, false, handle_nothrow_attribute,
    false },
  { "pure",         0, 0,  true,  false, false, handle_pure_attribute,
    false },
  { "no vops",      0, 0,  true,  false, false, handle_novops_attribute,
    false },
  { "nonnull",      0, -1, false, true,  true,  handle_nonnull_attribute,
    false },
  { "sentinel",     0, 1,  false, true,  true,  handle_sentinel_attribute,
    false },
  { "noreturn",     0, 0,  true,  false, false, handle_noreturn_attribute,
    false },
  { "leaf",         0, 0,  true,  false, false, handle_leaf_attribute,
    false },
  { "always_inline",0, 0,  true,  false, false, handle_always_inline_attribute,
    false },
  { "malloc",       0, 0,  true,  false, false, handle_malloc_attribute,
    false },
  { "type generic", 0, 0,  false, true, true, handle_type_generic_attribute,
    false },

  { "vector_size",  1, 1,  false, true, false,  handle_vector_size_attribute,
    false },
  { "vector_type",  0, 0,  false, true, false,  handle_vector_type_attribute,
    false },
  { "may_alias",    0, 0, false, true, false, NULL, false },

  /* ??? format and format_arg are heavy and not supported, which actually
     prevents support for stdio builtins, which we however declare as part
     of the common builtins.def contents.  */
  { "format",     3, 3,  false, true,  true,  fake_attribute_handler, false },
  { "format_arg", 1, 1,  false, true,  true,  fake_attribute_handler, false },

  { NULL,         0, 0, false, false, false, NULL, false }
};

/* Associates a GNAT tree node to a GCC tree node. It is used in
   `save_gnu_tree', `get_gnu_tree' and `present_gnu_tree'. See documentation
   of `save_gnu_tree' for more info.  */
static GTY((length ("max_gnat_nodes"))) tree *associate_gnat_to_gnu;

#define GET_GNU_TREE(GNAT_ENTITY)	\
  associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id]

#define SET_GNU_TREE(GNAT_ENTITY,VAL)	\
  associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] = (VAL)

#define PRESENT_GNU_TREE(GNAT_ENTITY)	\
  (associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE)

/* Associates a GNAT entity to a GCC tree node used as a dummy, if any.  */
static GTY((length ("max_gnat_nodes"))) tree *dummy_node_table;

#define GET_DUMMY_NODE(GNAT_ENTITY)	\
  dummy_node_table[(GNAT_ENTITY) - First_Node_Id]

#define SET_DUMMY_NODE(GNAT_ENTITY,VAL)	\
  dummy_node_table[(GNAT_ENTITY) - First_Node_Id] = (VAL)

#define PRESENT_DUMMY_NODE(GNAT_ENTITY)	\
  (dummy_node_table[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE)

/* This variable keeps a table for types for each precision so that we only
   allocate each of them once. Signed and unsigned types are kept separate.

   Note that these types are only used when fold-const requests something
   special.  Perhaps we should NOT share these types; we'll see how it
   goes later.  */
static GTY(()) tree signed_and_unsigned_types[2 * MAX_BITS_PER_WORD + 1][2];

/* Likewise for float types, but record these by mode.  */
static GTY(()) tree float_types[NUM_MACHINE_MODES];

/* For each binding contour we allocate a binding_level structure to indicate
   the binding depth.  */

struct GTY((chain_next ("%h.chain"))) gnat_binding_level {
  /* The binding level containing this one (the enclosing binding level). */
  struct gnat_binding_level *chain;
  /* The BLOCK node for this level.  */
  tree block;
  /* If nonzero, the setjmp buffer that needs to be updated for any
     variable-sized definition within this context.  */
  tree jmpbuf_decl;
};

/* The binding level currently in effect.  */
static GTY(()) struct gnat_binding_level *current_binding_level;

/* A chain of gnat_binding_level structures awaiting reuse.  */
static GTY((deletable)) struct gnat_binding_level *free_binding_level;

/* The context to be used for global declarations.  */
static GTY(()) tree global_context;

/* An array of global declarations.  */
static GTY(()) vec<tree, va_gc> *global_decls;

/* An array of builtin function declarations.  */
static GTY(()) vec<tree, va_gc> *builtin_decls;

/* An array of global renaming pointers.  */
static GTY(()) vec<tree, va_gc> *global_renaming_pointers;

/* A chain of unused BLOCK nodes. */
static GTY((deletable)) tree free_block_chain;

/* A hash table of padded types.  It is modelled on the generic type
   hash table in tree.c, which must thus be used as a reference.  */

struct GTY((for_user)) pad_type_hash {
  unsigned long hash;
  tree type;
};

struct pad_type_hasher : ggc_cache_hasher<pad_type_hash *>
{
  static inline hashval_t hash (pad_type_hash *t) { return t->hash; }
  static bool equal (pad_type_hash *a, pad_type_hash *b);
  static void handle_cache_entry (pad_type_hash *&);
};

static GTY ((cache))
  hash_table<pad_type_hasher> *pad_type_hash_table;

static tree merge_sizes (tree, tree, tree, bool, bool);
static tree compute_related_constant (tree, tree);
static tree split_plus (tree, tree *);
static tree float_type_for_precision (int, machine_mode);
static tree convert_to_fat_pointer (tree, tree);
static unsigned int scale_by_factor_of (tree, unsigned int);
static bool potential_alignment_gap (tree, tree, tree);

/* A linked list used as a queue to defer the initialization of the
   DECL_CONTEXT attribute of ..._DECL nodes and of the TYPE_CONTEXT attribute
   of ..._TYPE nodes.  */
struct deferred_decl_context_node
{
  tree decl;		    /* The ..._DECL node to work on.  */
  Entity_Id gnat_scope;     /* The corresponding entity's Scope attribute.  */
  int force_global;	    /* force_global value when pushing DECL. */
  vec<tree, va_heap, vl_ptr> types;	    /* A list of ..._TYPE nodes to propagate the
			       context to.  */
  struct deferred_decl_context_node *next;  /* The next queue item.  */
};

static struct deferred_decl_context_node *deferred_decl_context_queue = NULL;

/* Defer the initialization of DECL's DECL_CONTEXT attribute, scheduling to
   feed it with the elaboration of GNAT_SCOPE.  */
static struct deferred_decl_context_node *
add_deferred_decl_context (tree decl, Entity_Id gnat_scope, int force_global);

/* Defer the initialization of TYPE's TYPE_CONTEXT attribute, scheduling to
   feed it with the DECL_CONTEXT computed as part of N as soon as it is
   computed.  */
static void add_deferred_type_context (struct deferred_decl_context_node *n,
				       tree type);

/* Initialize data structures of the utils.c module.  */

void
init_gnat_utils (void)
{
  /* Initialize the association of GNAT nodes to GCC trees.  */
  associate_gnat_to_gnu = ggc_cleared_vec_alloc<tree> (max_gnat_nodes);

  /* Initialize the association of GNAT nodes to GCC trees as dummies.  */
  dummy_node_table = ggc_cleared_vec_alloc<tree> (max_gnat_nodes);

  /* Initialize the hash table of padded types.  */
  pad_type_hash_table = hash_table<pad_type_hasher>::create_ggc (512);
}

/* Destroy data structures of the utils.c module.  */

void
destroy_gnat_utils (void)
{
  /* Destroy the association of GNAT nodes to GCC trees.  */
  ggc_free (associate_gnat_to_gnu);
  associate_gnat_to_gnu = NULL;

  /* Destroy the association of GNAT nodes to GCC trees as dummies.  */
  ggc_free (dummy_node_table);
  dummy_node_table = NULL;

  /* Destroy the hash table of padded types.  */
  pad_type_hash_table->empty ();
  pad_type_hash_table = NULL;

  /* Invalidate the global renaming pointers.   */
  invalidate_global_renaming_pointers ();
}

/* GNAT_ENTITY is a GNAT tree node for an entity.  Associate GNU_DECL, a GCC
   tree node, with GNAT_ENTITY.  If GNU_DECL is not a ..._DECL node, abort.
   If NO_CHECK is true, the latter check is suppressed.

   If GNU_DECL is zero, reset a previous association.  */

void
save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check)
{
  /* Check that GNAT_ENTITY is not already defined and that it is being set
     to something which is a decl.  If that is not the case, this usually
     means GNAT_ENTITY is defined twice, but occasionally is due to some
     Gigi problem.  */
  gcc_assert (!(gnu_decl
		&& (PRESENT_GNU_TREE (gnat_entity)
		    || (!no_check && !DECL_P (gnu_decl)))));

  SET_GNU_TREE (gnat_entity, gnu_decl);
}

/* GNAT_ENTITY is a GNAT tree node for an entity.  Return the GCC tree node
   that was associated with it.  If there is no such tree node, abort.

   In some cases, such as delayed elaboration or expressions that need to
   be elaborated only once, GNAT_ENTITY is really not an entity.  */

tree
get_gnu_tree (Entity_Id gnat_entity)
{
  gcc_assert (PRESENT_GNU_TREE (gnat_entity));
  return GET_GNU_TREE (gnat_entity);
}

/* Return nonzero if a GCC tree has been associated with GNAT_ENTITY.  */

bool
present_gnu_tree (Entity_Id gnat_entity)
{
  return PRESENT_GNU_TREE (gnat_entity);
}

/* Make a dummy type corresponding to GNAT_TYPE.  */

tree
make_dummy_type (Entity_Id gnat_type)
{
  Entity_Id gnat_equiv = Gigi_Equivalent_Type (Underlying_Type (gnat_type));
  tree gnu_type;

  /* If there was no equivalent type (can only happen when just annotating
     types) or underlying type, go back to the original type.  */
  if (No (gnat_equiv))
    gnat_equiv = gnat_type;

  /* If it there already a dummy type, use that one.  Else make one.  */
  if (PRESENT_DUMMY_NODE (gnat_equiv))
    return GET_DUMMY_NODE (gnat_equiv);

  /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make
     an ENUMERAL_TYPE.  */
  gnu_type = make_node (Is_Record_Type (gnat_equiv)
			? tree_code_for_record_type (gnat_equiv)
			: ENUMERAL_TYPE);
  TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
  TYPE_DUMMY_P (gnu_type) = 1;
  TYPE_STUB_DECL (gnu_type)
    = create_type_stub_decl (TYPE_NAME (gnu_type), gnu_type);
  if (Is_By_Reference_Type (gnat_equiv))
    TYPE_BY_REFERENCE_P (gnu_type) = 1;

  SET_DUMMY_NODE (gnat_equiv, gnu_type);

  return gnu_type;
}

/* Return the dummy type that was made for GNAT_TYPE, if any.  */

tree
get_dummy_type (Entity_Id gnat_type)
{
  return GET_DUMMY_NODE (gnat_type);
}

/* Build dummy fat and thin pointer types whose designated type is specified
   by GNAT_DESIG_TYPE/GNU_DESIG_TYPE and attach them to the latter.  */

void
build_dummy_unc_pointer_types (Entity_Id gnat_desig_type, tree gnu_desig_type)
{
  tree gnu_template_type, gnu_ptr_template, gnu_array_type, gnu_ptr_array;
  tree gnu_fat_type, fields, gnu_object_type;

  gnu_template_type = make_node (RECORD_TYPE);
  TYPE_NAME (gnu_template_type) = create_concat_name (gnat_desig_type, "XUB");
  TYPE_DUMMY_P (gnu_template_type) = 1;
  gnu_ptr_template = build_pointer_type (gnu_template_type);

  gnu_array_type = make_node (ENUMERAL_TYPE);
  TYPE_NAME (gnu_array_type) = create_concat_name (gnat_desig_type, "XUA");
  TYPE_DUMMY_P (gnu_array_type) = 1;
  gnu_ptr_array = build_pointer_type (gnu_array_type);

  gnu_fat_type = make_node (RECORD_TYPE);
  /* Build a stub DECL to trigger the special processing for fat pointer types
     in gnat_pushdecl.  */
  TYPE_NAME (gnu_fat_type)
    = create_type_stub_decl (create_concat_name (gnat_desig_type, "XUP"),
			     gnu_fat_type);
  fields = create_field_decl (get_identifier ("P_ARRAY"), gnu_ptr_array,
			      gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0);
  DECL_CHAIN (fields)
    = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template,
			 gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0);
  finish_fat_pointer_type (gnu_fat_type, fields);
  SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_desig_type);
  /* Suppress debug info until after the type is completed.  */
  TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (gnu_fat_type)) = 1;

  gnu_object_type = make_node (RECORD_TYPE);
  TYPE_NAME (gnu_object_type) = create_concat_name (gnat_desig_type, "XUT");
  TYPE_DUMMY_P (gnu_object_type) = 1;

  TYPE_POINTER_TO (gnu_desig_type) = gnu_fat_type;
  TYPE_OBJECT_RECORD_TYPE (gnu_desig_type) = gnu_object_type;
}

/* Return true if we are in the global binding level.  */

bool
global_bindings_p (void)
{
  return force_global || current_function_decl == NULL_TREE;
}

/* Enter a new binding level.  */

void
gnat_pushlevel (void)
{
  struct gnat_binding_level *newlevel = NULL;

  /* Reuse a struct for this binding level, if there is one.  */
  if (free_binding_level)
    {
      newlevel = free_binding_level;
      free_binding_level = free_binding_level->chain;
    }
  else
    newlevel = ggc_alloc<gnat_binding_level> ();

  /* Use a free BLOCK, if any; otherwise, allocate one.  */
  if (free_block_chain)
    {
      newlevel->block = free_block_chain;
      free_block_chain = BLOCK_CHAIN (free_block_chain);
      BLOCK_CHAIN (newlevel->block) = NULL_TREE;
    }
  else
    newlevel->block = make_node (BLOCK);

  /* Point the BLOCK we just made to its parent.  */
  if (current_binding_level)
    BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block;

  BLOCK_VARS (newlevel->block) = NULL_TREE;
  BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE;
  TREE_USED (newlevel->block) = 1;

  /* Add this level to the front of the chain (stack) of active levels.  */
  newlevel->chain = current_binding_level;
  newlevel->jmpbuf_decl = NULL_TREE;
  current_binding_level = newlevel;
}

/* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL
   and point FNDECL to this BLOCK.  */

void
set_current_block_context (tree fndecl)
{
  BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl;
  DECL_INITIAL (fndecl) = current_binding_level->block;
  set_block_for_group (current_binding_level->block);
}

/* Set the jmpbuf_decl for the current binding level to DECL.  */

void
set_block_jmpbuf_decl (tree decl)
{
  current_binding_level->jmpbuf_decl = decl;
}

/* Get the jmpbuf_decl, if any, for the current binding level.  */

tree
get_block_jmpbuf_decl (void)
{
  return current_binding_level->jmpbuf_decl;
}

/* Exit a binding level.  Set any BLOCK into the current code group.  */

void
gnat_poplevel (void)
{
  struct gnat_binding_level *level = current_binding_level;
  tree block = level->block;

  BLOCK_VARS (block) = nreverse (BLOCK_VARS (block));
  BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block));

  /* If this is a function-level BLOCK don't do anything.  Otherwise, if there
     are no variables free the block and merge its subblocks into those of its
     parent block.  Otherwise, add it to the list of its parent.  */
  if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL)
    ;
  else if (BLOCK_VARS (block) == NULL_TREE)
    {
      BLOCK_SUBBLOCKS (level->chain->block)
	= block_chainon (BLOCK_SUBBLOCKS (block),
			 BLOCK_SUBBLOCKS (level->chain->block));
      BLOCK_CHAIN (block) = free_block_chain;
      free_block_chain = block;
    }
  else
    {
      BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block);
      BLOCK_SUBBLOCKS (level->chain->block) = block;
      TREE_USED (block) = 1;
      set_block_for_group (block);
    }

  /* Free this binding structure.  */
  current_binding_level = level->chain;
  level->chain = free_binding_level;
  free_binding_level = level;
}

/* Exit a binding level and discard the associated BLOCK.  */

void
gnat_zaplevel (void)
{
  struct gnat_binding_level *level = current_binding_level;
  tree block = level->block;

  BLOCK_CHAIN (block) = free_block_chain;
  free_block_chain = block;

  /* Free this binding structure.  */
  current_binding_level = level->chain;
  level->chain = free_binding_level;
  free_binding_level = level;
}

/* Set the context of TYPE and its parallel types (if any) to CONTEXT.  */

static void
gnat_set_type_context (tree type, tree context)
{
  tree decl = TYPE_STUB_DECL (type);

  TYPE_CONTEXT (type) = context;

  while (decl && DECL_PARALLEL_TYPE (decl))
    {
      tree parallel_type = DECL_PARALLEL_TYPE (decl);

      /* Give a context to the parallel types and their stub decl, if any.
	 Some parallel types seems to be present in multiple parallel type
	 chains, so don't mess with their context if they already have one.  */
      if (TYPE_CONTEXT (parallel_type) == NULL_TREE)
	{
	  if (TYPE_STUB_DECL (parallel_type) != NULL_TREE)
	    DECL_CONTEXT (TYPE_STUB_DECL (parallel_type)) = context;
	  TYPE_CONTEXT (parallel_type) = context;
	}

      decl = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (decl));
    }
}

/* Return the innermost scope, starting at GNAT_NODE, we are be interested in
   the debug info, or Empty if there is no such scope.  If not NULL, set
   IS_SUBPROGRAM to whether the returned entity is a subprogram.  */

static Entity_Id
get_debug_scope (Node_Id gnat_node, bool *is_subprogram)
{
  Entity_Id gnat_entity;

  if (is_subprogram)
    *is_subprogram = false;

  if (Nkind (gnat_node) == N_Defining_Identifier)
    gnat_entity = Scope (gnat_node);
  else
    return Empty;

  while (Present (gnat_entity))
    {
      switch (Ekind (gnat_entity))
	{
	case E_Function:
	case E_Procedure:
	  if (Present (Protected_Body_Subprogram (gnat_entity)))
	    gnat_entity = Protected_Body_Subprogram (gnat_entity);

	  /* If the scope is a subprogram, then just rely on
	     current_function_decl, so that we don't have to defer
	     anything.  This is needed because other places rely on the
	     validity of the DECL_CONTEXT attribute of FUNCTION_DECL nodes. */
	  if (is_subprogram)
	    *is_subprogram = true;
	  return gnat_entity;

	case E_Record_Type:
	case E_Record_Subtype:
	  return gnat_entity;

	default:
	  /* By default, we are not interested in this particular scope: go to
	     the outer one.  */
	  break;
	}
      gnat_entity = Scope (gnat_entity);
    }
  return Empty;
}

/* If N is NULL, set TYPE's context to CONTEXT. Defer this to the processing of
   N otherwise.  */

static void
defer_or_set_type_context (tree type,
			   tree context,
			   struct deferred_decl_context_node *n)
{
  if (n)
    add_deferred_type_context (n, type);
  else
    gnat_set_type_context (type, context);
}

/* Return global_context.  Create it if needed, first.  */

static tree
get_global_context (void)
{
  if (!global_context)
    global_context = build_translation_unit_decl (NULL_TREE);
  return global_context;
}

/* Record DECL as belonging to the current lexical scope and use GNAT_NODE
   for location information and flag propagation.  */

void
gnat_pushdecl (tree decl, Node_Id gnat_node)
{
  tree context = NULL_TREE;
  struct deferred_decl_context_node *deferred_decl_context = NULL;

  /* If explicitely asked to make DECL global or if it's an imported nested
     object, short-circuit the regular Scope-based context computation.  */
  if (!((TREE_PUBLIC (decl) && DECL_EXTERNAL (decl)) || force_global == 1))
    {
      /* Rely on the GNAT scope, or fallback to the current_function_decl if
	 the GNAT scope reached the global scope, if it reached a subprogram
	 or the declaration is a subprogram or a variable (for them we skip
	 intermediate context types because the subprogram body elaboration
	 machinery and the inliner both expect a subprogram context).

	 Falling back to current_function_decl is necessary for implicit
	 subprograms created by gigi, such as the elaboration subprograms.  */
      bool context_is_subprogram = false;
      const Entity_Id gnat_scope
        = get_debug_scope (gnat_node, &context_is_subprogram);

      if (Present (gnat_scope)
	  && !context_is_subprogram
	  && TREE_CODE (decl) != FUNCTION_DECL
	  && TREE_CODE (decl) != VAR_DECL)
	/* Always assume the scope has not been elaborated, thus defer the
	   context propagation to the time its elaboration will be
	   available.  */
	deferred_decl_context
	  = add_deferred_decl_context (decl, gnat_scope, force_global);

      /* External declarations (when force_global > 0) may not be in a
	 local context.  */
      else if (current_function_decl != NULL_TREE && force_global == 0)
	context = current_function_decl;
    }

  /* If either we are forced to be in global mode or if both the GNAT scope and
     the current_function_decl did not help determining the context, use the
     global scope.  */
  if (!deferred_decl_context && context == NULL_TREE)
    context = get_global_context ();

  /* Functions imported in another function are not really nested.
     For really nested functions mark them initially as needing
     a static chain for uses of that flag before unnesting;
     lower_nested_functions will then recompute it.  */
  if (TREE_CODE (decl) == FUNCTION_DECL
      && !TREE_PUBLIC (decl)
      && context != NULL_TREE
      && (TREE_CODE (context) == FUNCTION_DECL
	  || decl_function_context (context) != NULL_TREE))
    DECL_STATIC_CHAIN (decl) = 1;

  if (!deferred_decl_context)
    DECL_CONTEXT (decl) = context;

  TREE_NO_WARNING (decl) = (No (gnat_node) || Warnings_Off (gnat_node));

  /* Set the location of DECL and emit a declaration for it.  */
  if (Present (gnat_node) && !renaming_from_generic_instantiation_p (gnat_node))
    Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl));

  add_decl_expr (decl, gnat_node);

  /* Put the declaration on the list.  The list of declarations is in reverse
     order.  The list will be reversed later.  Put global declarations in the
     globals list and local ones in the current block.  But skip TYPE_DECLs
     for UNCONSTRAINED_ARRAY_TYPE in both cases, as they will cause trouble
     with the debugger and aren't needed anyway.  */
  if (!(TREE_CODE (decl) == TYPE_DECL
        && TREE_CODE (TREE_TYPE (decl)) == UNCONSTRAINED_ARRAY_TYPE))
    {
      if (DECL_EXTERNAL (decl))
	{
	  if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
	    vec_safe_push (builtin_decls, decl);
	}
      else if (global_bindings_p ())
	vec_safe_push (global_decls, decl);
      else
	{
	  DECL_CHAIN (decl) = BLOCK_VARS (current_binding_level->block);
	  BLOCK_VARS (current_binding_level->block) = decl;
	}
    }

  /* For the declaration of a type, set its name either if it isn't already
     set or if the previous type name was not derived from a source name.
     We'd rather have the type named with a real name and all the pointer
     types to the same object have the same node, except when the names are
     both derived from source names.  */
  if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl))
    {
      tree t = TREE_TYPE (decl);

      if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)
	  && (TREE_CODE (t) != POINTER_TYPE || DECL_ARTIFICIAL (decl)))
	{
	  /* Array types aren't "tagged" types so we force the type to be
	     associated with its typedef in the DWARF back-end, in order to
	     make sure that the latter is always preserved, by creating an
	     on-side copy for DECL_ORIGINAL_TYPE.  We used to do the same
	     for pointer types, but to have consistent DWARF output we now
	     create a copy for the type itself and use the original type
	     for DECL_ORIGINAL_TYPE like the C front-end.  */
	  if (!DECL_ARTIFICIAL (decl) && TREE_CODE (t) == ARRAY_TYPE)
	    {
	      tree tt = build_distinct_type_copy (t);
	      /* Array types need to have a name so that they can be related
		 to their GNAT encodings.  */
	      TYPE_NAME (tt) = DECL_NAME (decl);
	      defer_or_set_type_context (tt,
					 DECL_CONTEXT (decl),
					 deferred_decl_context);
	      TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (t);
	      DECL_ORIGINAL_TYPE (decl) = tt;
	    }
	}
      else if (!DECL_ARTIFICIAL (decl)
	       && (TREE_CODE (t) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (t)))
	{
	  tree tt;
	  /* ??? Copy and original type are not supposed to be variant but we
	     really need a variant for the placeholder machinery to work.  */
	  if (TYPE_IS_FAT_POINTER_P (t))
	    tt = build_variant_type_copy (t);
	  else
	    {
	      /* TYPE_NEXT_PTR_TO is a chain of main variants.  */
	      tt = build_distinct_type_copy (TYPE_MAIN_VARIANT (t));
	      TYPE_NEXT_PTR_TO (TYPE_MAIN_VARIANT (t)) = tt;
	      tt = build_qualified_type (tt, TYPE_QUALS (t));
	    }
	  TYPE_NAME (tt) = decl;
	  defer_or_set_type_context (tt,
				     DECL_CONTEXT (decl),
				     deferred_decl_context);
	  TREE_USED (tt) = TREE_USED (t);
	  TREE_TYPE (decl) = tt;
	  if (TYPE_NAME (t) != NULL_TREE
	      && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL
	      && DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
	    DECL_ORIGINAL_TYPE (decl) = DECL_ORIGINAL_TYPE (TYPE_NAME (t));
	  else
	    DECL_ORIGINAL_TYPE (decl) = t;
	  t = NULL_TREE;
	}
      else if (TYPE_NAME (t) != NULL_TREE
	       && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL
	       && DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl))
	;
      else
	t = NULL_TREE;

      /* Propagate the name to all the anonymous variants.  This is needed
	 for the type qualifiers machinery to work properly (see
	 check_qualified_type).  Also propagate the context to them.  Note that
	 the context will be propagated to all parallel types too thanks to
	 gnat_set_type_context.  */
      if (t)
	for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
	  if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL))
	    {
	      TYPE_NAME (t) = decl;
	      defer_or_set_type_context (t,
					 DECL_CONTEXT (decl),
					 deferred_decl_context);
	    }
    }
}

/* Create a record type that contains a SIZE bytes long field of TYPE with a
   starting bit position so that it is aligned to ALIGN bits, and leaving at
   least ROOM bytes free before the field.  BASE_ALIGN is the alignment the
   record is guaranteed to get.  GNAT_NODE is used for the position of the
   associated TYPE_DECL.  */

tree
make_aligning_type (tree type, unsigned int align, tree size,
		    unsigned int base_align, int room, Node_Id gnat_node)
{
  /* We will be crafting a record type with one field at a position set to be
     the next multiple of ALIGN past record'address + room bytes.  We use a
     record placeholder to express record'address.  */
  tree record_type = make_node (RECORD_TYPE);
  tree record = build0 (PLACEHOLDER_EXPR, record_type);

  tree record_addr_st
    = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record));

  /* The diagram below summarizes the shape of what we manipulate:

                    <--------- pos ---------->
                {  +------------+-------------+-----------------+
      record  =>{  |############|     ...     | field (type)    |
                {  +------------+-------------+-----------------+
		   |<-- room -->|<- voffset ->|<---- size ----->|
		   o            o
		   |            |
		   record_addr  vblock_addr

     Every length is in sizetype bytes there, except "pos" which has to be
     set as a bit position in the GCC tree for the record.  */
  tree room_st = size_int (room);
  tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st);
  tree voffset_st, pos, field;

  tree name = TYPE_IDENTIFIER (type);

  name = concat_name (name, "ALIGN");
  TYPE_NAME (record_type) = name;

  /* Compute VOFFSET and then POS.  The next byte position multiple of some
     alignment after some address is obtained by "and"ing the alignment minus
     1 with the two's complement of the address.   */
  voffset_st = size_binop (BIT_AND_EXPR,
			   fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st),
			   size_int ((align / BITS_PER_UNIT) - 1));

  /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype.  */
  pos = size_binop (MULT_EXPR,
		    convert (bitsizetype,
			     size_binop (PLUS_EXPR, room_st, voffset_st)),
                    bitsize_unit_node);

  /* Craft the GCC record representation.  We exceptionally do everything
     manually here because 1) our generic circuitry is not quite ready to
     handle the complex position/size expressions we are setting up, 2) we
     have a strong simplifying factor at hand: we know the maximum possible
     value of voffset, and 3) we have to set/reset at least the sizes in
     accordance with this maximum value anyway, as we need them to convey
     what should be "alloc"ated for this type.

     Use -1 as the 'addressable' indication for the field to prevent the
     creation of a bitfield.  We don't need one, it would have damaging
     consequences on the alignment computation, and create_field_decl would
     make one without this special argument, for instance because of the
     complex position expression.  */
  field = create_field_decl (get_identifier ("F"), type, record_type, size,
			     pos, 1, -1);
  TYPE_FIELDS (record_type) = field;

  TYPE_ALIGN (record_type) = base_align;
  TYPE_USER_ALIGN (record_type) = 1;

  TYPE_SIZE (record_type)
    = size_binop (PLUS_EXPR,
                  size_binop (MULT_EXPR, convert (bitsizetype, size),
                              bitsize_unit_node),
		  bitsize_int (align + room * BITS_PER_UNIT));
  TYPE_SIZE_UNIT (record_type)
    = size_binop (PLUS_EXPR, size,
		  size_int (room + align / BITS_PER_UNIT));

  SET_TYPE_MODE (record_type, BLKmode);
  relate_alias_sets (record_type, type, ALIAS_SET_COPY);

  /* Declare it now since it will never be declared otherwise.  This is
     necessary to ensure that its subtrees are properly marked.  */
  create_type_decl (name, record_type, true, false, gnat_node);

  return record_type;
}

/* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used
   as the field type of a packed record if IN_RECORD is true, or as the
   component type of a packed array if IN_RECORD is false.  See if we can
   rewrite it either as a type that has a non-BLKmode, which we can pack
   tighter in the packed record case, or as a smaller type.  If so, return
   the new type.  If not, return the original type.  */

tree
make_packable_type (tree type, bool in_record)
{
  unsigned HOST_WIDE_INT size = tree_to_uhwi (TYPE_SIZE (type));
  unsigned HOST_WIDE_INT new_size;
  tree new_type, old_field, field_list = NULL_TREE;
  unsigned int align;

  /* No point in doing anything if the size is zero.  */
  if (size == 0)
    return type;

  new_type = make_node (TREE_CODE (type));

  /* Copy the name and flags from the old type to that of the new.
     Note that we rely on the pointer equality created here for
     TYPE_NAME to look through conversions in various places.  */
  TYPE_NAME (new_type) = TYPE_NAME (type);
  TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type);
  TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type);
  if (TREE_CODE (type) == RECORD_TYPE)
    TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type);

  /* If we are in a record and have a small size, set the alignment to
     try for an integral mode.  Otherwise set it to try for a smaller
     type with BLKmode.  */
  if (in_record && size <= MAX_FIXED_MODE_SIZE)
    {
      align = ceil_pow2 (size);
      TYPE_ALIGN (new_type) = align;
      new_size = (size + align - 1) & -align;
    }
  else
    {
      unsigned HOST_WIDE_INT align;

      /* Do not try to shrink the size if the RM size is not constant.  */
      if (TYPE_CONTAINS_TEMPLATE_P (type)
	  || !tree_fits_uhwi_p (TYPE_ADA_SIZE (type)))
	return type;

      /* Round the RM size up to a unit boundary to get the minimal size
	 for a BLKmode record.  Give up if it's already the size.  */
      new_size = tree_to_uhwi (TYPE_ADA_SIZE (type));
      new_size = (new_size + BITS_PER_UNIT - 1) & -BITS_PER_UNIT;
      if (new_size == size)
	return type;

      align = new_size & -new_size;
      TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align);
    }

  TYPE_USER_ALIGN (new_type) = 1;

  /* Now copy the fields, keeping the position and size as we don't want
     to change the layout by propagating the packedness downwards.  */
  for (old_field = TYPE_FIELDS (type); old_field;
       old_field = DECL_CHAIN (old_field))
    {
      tree new_field_type = TREE_TYPE (old_field);
      tree new_field, new_size;

      if (RECORD_OR_UNION_TYPE_P (new_field_type)
	  && !TYPE_FAT_POINTER_P (new_field_type)
	  && tree_fits_uhwi_p (TYPE_SIZE (new_field_type)))
	new_field_type = make_packable_type (new_field_type, true);

      /* However, for the last field in a not already packed record type
	 that is of an aggregate type, we need to use the RM size in the
	 packable version of the record type, see finish_record_type.  */
      if (!DECL_CHAIN (old_field)
	  && !TYPE_PACKED (type)
	  && RECORD_OR_UNION_TYPE_P (new_field_type)
	  && !TYPE_FAT_POINTER_P (new_field_type)
	  && !TYPE_CONTAINS_TEMPLATE_P (new_field_type)
	  && TYPE_ADA_SIZE (new_field_type))
	new_size = TYPE_ADA_SIZE (new_field_type);
      else
	new_size = DECL_SIZE (old_field);

      new_field
	= create_field_decl (DECL_NAME (old_field), new_field_type, new_type,
			     new_size, bit_position (old_field),
			     TYPE_PACKED (type),
			     !DECL_NONADDRESSABLE_P (old_field));

      DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
      SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
      if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
	DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);

      DECL_CHAIN (new_field) = field_list;
      field_list = new_field;
    }

  finish_record_type (new_type, nreverse (field_list), 2, false);
  relate_alias_sets (new_type, type, ALIAS_SET_COPY);
  if (TYPE_STUB_DECL (type))
    SET_DECL_PARALLEL_TYPE (TYPE_STUB_DECL (new_type),
			    DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type)));

  /* If this is a padding record, we never want to make the size smaller
     than what was specified.  For QUAL_UNION_TYPE, also copy the size.  */
  if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE)
    {
      TYPE_SIZE (new_type) = TYPE_SIZE (type);
      TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type);
      new_size = size;
    }
  else
    {
      TYPE_SIZE (new_type) = bitsize_int (new_size);
      TYPE_SIZE_UNIT (new_type)
	= size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
    }

  if (!TYPE_CONTAINS_TEMPLATE_P (type))
    SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type));

  compute_record_mode (new_type);

  /* Try harder to get a packable type if necessary, for example
     in case the record itself contains a BLKmode field.  */
  if (in_record && TYPE_MODE (new_type) == BLKmode)
    SET_TYPE_MODE (new_type,
		   mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1));

  /* If neither the mode nor the size has shrunk, return the old type.  */
  if (TYPE_MODE (new_type) == BLKmode && new_size >= size)
    return type;

  return new_type;
}

/* Given a type TYPE, return a new type whose size is appropriate for SIZE.
   If TYPE is the best type, return it.  Otherwise, make a new type.  We
   only support new integral and pointer types.  FOR_BIASED is true if
   we are making a biased type.  */

tree
make_type_from_size (tree type, tree size_tree, bool for_biased)
{
  unsigned HOST_WIDE_INT size;
  bool biased_p;
  tree new_type;

  /* If size indicates an error, just return TYPE to avoid propagating
     the error.  Likewise if it's too large to represent.  */
  if (!size_tree || !tree_fits_uhwi_p (size_tree))
    return type;

  size = tree_to_uhwi (size_tree);

  switch (TREE_CODE (type))
    {
    case INTEGER_TYPE:
    case ENUMERAL_TYPE:
    case BOOLEAN_TYPE:
      biased_p = (TREE_CODE (type) == INTEGER_TYPE
		  && TYPE_BIASED_REPRESENTATION_P (type));

      /* Integer types with precision 0 are forbidden.  */
      if (size == 0)
	size = 1;

      /* Only do something if the type isn't a packed array type and doesn't
	 already have the proper size and the size isn't too large.  */
      if (TYPE_IS_PACKED_ARRAY_TYPE_P (type)
	  || (TYPE_PRECISION (type) == size && biased_p == for_biased)
	  || size > LONG_LONG_TYPE_SIZE)
	break;

      biased_p |= for_biased;
      if (TYPE_UNSIGNED (type) || biased_p)
	new_type = make_unsigned_type (size);
      else
	new_type = make_signed_type (size);
      TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type;
      SET_TYPE_RM_MIN_VALUE (new_type, TYPE_MIN_VALUE (type));
      SET_TYPE_RM_MAX_VALUE (new_type, TYPE_MAX_VALUE (type));
      /* Copy the name to show that it's essentially the same type and
	 not a subrange type.  */
      TYPE_NAME (new_type) = TYPE_NAME (type);
      TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p;
      SET_TYPE_RM_SIZE (new_type, bitsize_int (size));
      return new_type;

    case RECORD_TYPE:
      /* Do something if this is a fat pointer, in which case we
	 may need to return the thin pointer.  */
      if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2)
	{
	  machine_mode p_mode = mode_for_size (size, MODE_INT, 0);
	  if (!targetm.valid_pointer_mode (p_mode))
	    p_mode = ptr_mode;
	  return
	    build_pointer_type_for_mode
	      (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)),
	       p_mode, 0);
	}
      break;

    case POINTER_TYPE:
      /* Only do something if this is a thin pointer, in which case we
	 may need to return the fat pointer.  */
      if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2)
	return
	  build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)));
      break;

    default:
      break;
    }

  return type;
}

/* See if the data pointed to by the hash table slot is marked.  */

void
pad_type_hasher::handle_cache_entry (pad_type_hash *&t)
{
  extern void gt_ggc_mx (pad_type_hash *&);
  if (t == HTAB_EMPTY_ENTRY || t == HTAB_DELETED_ENTRY)
    return;
  else if (ggc_marked_p (t->type))
    gt_ggc_mx (t);
  else
    t = static_cast<pad_type_hash *> (HTAB_DELETED_ENTRY);
}

/* Return true iff the padded types are equivalent.  */

bool
pad_type_hasher::equal (pad_type_hash *t1, pad_type_hash *t2)
{
  tree type1, type2;

  if (t1->hash != t2->hash)
    return 0;

  type1 = t1->type;
  type2 = t2->type;

  /* We consider that the padded types are equivalent if they pad the same
     type and have the same size, alignment and RM size.  Taking the mode
     into account is redundant since it is determined by the others.  */
  return
    TREE_TYPE (TYPE_FIELDS (type1)) == TREE_TYPE (TYPE_FIELDS (type2))
    && TYPE_SIZE (type1) == TYPE_SIZE (type2)
    && TYPE_ALIGN (type1) == TYPE_ALIGN (type2)
    && TYPE_ADA_SIZE (type1) == TYPE_ADA_SIZE (type2);
}

/* Look up the padded TYPE in the hash table and return its canonical version
   if it exists; otherwise, insert it into the hash table.  */

static tree
lookup_and_insert_pad_type (tree type)
{
  hashval_t hashcode;
  struct pad_type_hash in, *h;

  hashcode
    = iterative_hash_object (TYPE_HASH (TREE_TYPE (TYPE_FIELDS (type))), 0);
  hashcode = iterative_hash_expr (TYPE_SIZE (type), hashcode);
  hashcode = iterative_hash_hashval_t (TYPE_ALIGN (type), hashcode);
  hashcode = iterative_hash_expr (TYPE_ADA_SIZE (type), hashcode);

  in.hash = hashcode;
  in.type = type;
  h = pad_type_hash_table->find_with_hash (&in, hashcode);
  if (h)
    return h->type;

  h = ggc_alloc<pad_type_hash> ();
  h->hash = hashcode;
  h->type = type;
  *pad_type_hash_table->find_slot_with_hash (h, hashcode, INSERT) = h;
  return NULL_TREE;
}

/* Ensure that TYPE has SIZE and ALIGN.  Make and return a new padded type
   if needed.  We have already verified that SIZE and ALIGN are large enough.
   GNAT_ENTITY is used to name the resulting record and to issue a warning.
   IS_COMPONENT_TYPE is true if this is being done for the component type of
   an array.  IS_USER_TYPE is true if the original type needs to be completed.
   DEFINITION is true if this type is being defined.  SET_RM_SIZE is true if
   the RM size of the resulting type is to be set to SIZE too.  */

tree
maybe_pad_type (tree type, tree size, unsigned int align,
		Entity_Id gnat_entity, bool is_component_type,
		bool is_user_type, bool definition, bool set_rm_size)
{
  tree orig_size = TYPE_SIZE (type);
  unsigned int orig_align = TYPE_ALIGN (type);
  tree record, field;

  /* If TYPE is a padded type, see if it agrees with any size and alignment
     we were given.  If so, return the original type.  Otherwise, strip
     off the padding, since we will either be returning the inner type
     or repadding it.  If no size or alignment is specified, use that of
     the original padded type.  */
  if (TYPE_IS_PADDING_P (type))
    {
      if ((!size
	   || operand_equal_p (round_up (size, orig_align), orig_size, 0))
	  && (align == 0 || align == orig_align))
	return type;

      if (!size)
	size = orig_size;
      if (align == 0)
	align = orig_align;

      type = TREE_TYPE (TYPE_FIELDS (type));
      orig_size = TYPE_SIZE (type);
      orig_align = TYPE_ALIGN (type);
    }

  /* If the size is either not being changed or is being made smaller (which
     is not done here and is only valid for bitfields anyway), show the size
     isn't changing.  Likewise, clear the alignment if it isn't being
     changed.  Then return if we aren't doing anything.  */
  if (size
      && (operand_equal_p (size, orig_size, 0)
	  || (TREE_CODE (orig_size) == INTEGER_CST
	      && tree_int_cst_lt (size, orig_size))))
    size = NULL_TREE;

  if (align == orig_align)
    align = 0;

  if (align == 0 && !size)
    return type;

  /* If requested, complete the original type and give it a name.  */
  if (is_user_type)
    create_type_decl (get_entity_name (gnat_entity), type,
		      !Comes_From_Source (gnat_entity),
		      !(TYPE_NAME (type)
			&& TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
			&& DECL_IGNORED_P (TYPE_NAME (type))),
		      gnat_entity);

  /* We used to modify the record in place in some cases, but that could
     generate incorrect debugging information.  So make a new record
     type and name.  */
  record = make_node (RECORD_TYPE);
  TYPE_PADDING_P (record) = 1;

  if (Present (gnat_entity))
    TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD");

  TYPE_ALIGN (record) = align ? align : orig_align;
  TYPE_SIZE (record) = size ? size : orig_size;
  TYPE_SIZE_UNIT (record)
    = convert (sizetype,
	       size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record),
			   bitsize_unit_node));

  /* If we are changing the alignment and the input type is a record with
     BLKmode and a small constant size, try to make a form that has an
     integral mode.  This might allow the padding record to also have an
     integral mode, which will be much more efficient.  There is no point
     in doing so if a size is specified unless it is also a small constant
     size and it is incorrect to do so if we cannot guarantee that the mode
     will be naturally aligned since the field must always be addressable.

     ??? This might not always be a win when done for a stand-alone object:
     since the nominal and the effective type of the object will now have
     different modes, a VIEW_CONVERT_EXPR will be required for converting
     between them and it might be hard to overcome afterwards, including
     at the RTL level when the stand-alone object is accessed as a whole.  */
  if (align != 0
      && RECORD_OR_UNION_TYPE_P (type)
      && TYPE_MODE (type) == BLKmode
      && !TYPE_BY_REFERENCE_P (type)
      && TREE_CODE (orig_size) == INTEGER_CST
      && !TREE_OVERFLOW (orig_size)
      && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0
      && (!size
	  || (TREE_CODE (size) == INTEGER_CST
	      && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0)))
    {
      tree packable_type = make_packable_type (type, true);
      if (TYPE_MODE (packable_type) != BLKmode
	  && align >= TYPE_ALIGN (packable_type))
        type = packable_type;
    }

  /* Now create the field with the original size.  */
  field  = create_field_decl (get_identifier ("F"), type, record, orig_size,
			      bitsize_zero_node, 0, 1);
  DECL_INTERNAL_P (field) = 1;

  /* Do not emit debug info until after the auxiliary record is built.  */
  finish_record_type (record, field, 1, false);

  /* Set the RM size if requested.  */
  if (set_rm_size)
    {
      tree canonical_pad_type;

      SET_TYPE_ADA_SIZE (record, size ? size : orig_size);

      /* If the padded type is complete and has constant size, we canonicalize
	 it by means of the hash table.  This is consistent with the language
	 semantics and ensures that gigi and the middle-end have a common view
	 of these padded types.  */
      if (TREE_CONSTANT (TYPE_SIZE (record))
	  && (canonical_pad_type = lookup_and_insert_pad_type (record)))
	{
	  record = canonical_pad_type;
	  goto built;
	}
    }

  /* Unless debugging information isn't being written for the input type,
     write a record that shows what we are a subtype of and also make a
     variable that indicates our size, if still variable.  */
  if (TREE_CODE (orig_size) != INTEGER_CST
      && TYPE_NAME (record)
      && TYPE_NAME (type)
      && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
	   && DECL_IGNORED_P (TYPE_NAME (type))))
    {
      tree marker = make_node (RECORD_TYPE);
      tree name = TYPE_IDENTIFIER (record);
      tree orig_name = TYPE_IDENTIFIER (type);

      TYPE_NAME (marker) = concat_name (name, "XVS");
      finish_record_type (marker,
			  create_field_decl (orig_name,
					     build_reference_type (type),
					     marker, NULL_TREE, NULL_TREE,
					     0, 0),
			  0, true);

      add_parallel_type (record, marker);

      if (definition && size && TREE_CODE (size) != INTEGER_CST)
	TYPE_SIZE_UNIT (marker)
	  = create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype,
			     TYPE_SIZE_UNIT (record), false, false, false,
			     false, NULL, gnat_entity);
    }

  rest_of_record_type_compilation (record);

built:
  /* If the size was widened explicitly, maybe give a warning.  Take the
     original size as the maximum size of the input if there was an
     unconstrained record involved and round it up to the specified alignment,
     if one was specified.  But don't do it if we are just annotating types
     and the type is tagged, since tagged types aren't fully laid out in this
     mode.  */
  if (!size
      || TREE_CODE (size) == COND_EXPR
      || TREE_CODE (size) == MAX_EXPR
      || No (gnat_entity)
      || (type_annotate_only && Is_Tagged_Type (Etype (gnat_entity))))
    return record;

  if (CONTAINS_PLACEHOLDER_P (orig_size))
    orig_size = max_size (orig_size, true);

  if (align)
    orig_size = round_up (orig_size, align);

  if (!operand_equal_p (size, orig_size, 0)
      && !(TREE_CODE (size) == INTEGER_CST
	   && TREE_CODE (orig_size) == INTEGER_CST
	   && (TREE_OVERFLOW (size)
	       || TREE_OVERFLOW (orig_size)
	       || tree_int_cst_lt (size, orig_size))))
    {
      Node_Id gnat_error_node = Empty;

      /* For a packed array, post the message on the original array type.  */
      if (Is_Packed_Array_Impl_Type (gnat_entity))
	gnat_entity = Original_Array_Type (gnat_entity);

      if ((Ekind (gnat_entity) == E_Component
	   || Ekind (gnat_entity) == E_Discriminant)
	  && Present (Component_Clause (gnat_entity)))
	gnat_error_node = Last_Bit (Component_Clause (gnat_entity));
      else if (Present (Size_Clause (gnat_entity)))
	gnat_error_node = Expression (Size_Clause (gnat_entity));

      /* Generate message only for entities that come from source, since
	 if we have an entity created by expansion, the message will be
	 generated for some other corresponding source entity.  */
      if (Comes_From_Source (gnat_entity))
	{
	  if (Present (gnat_error_node))
	    post_error_ne_tree ("{^ }bits of & unused?",
				gnat_error_node, gnat_entity,
				size_diffop (size, orig_size));
	  else if (is_component_type)
	    post_error_ne_tree ("component of& padded{ by ^ bits}?",
				gnat_entity, gnat_entity,
				size_diffop (size, orig_size));
	}
    }

  return record;
}

/* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP.
   If this is a multi-dimensional array type, do this recursively.

   OP may be
   - ALIAS_SET_COPY:     the new set is made a copy of the old one.
   - ALIAS_SET_SUPERSET: the new set is made a superset of the old one.
   - ALIAS_SET_SUBSET:   the new set is made a subset of the old one.  */

void
relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op)
{
  /* Remove any padding from GNU_OLD_TYPE.  It doesn't matter in the case
     of a one-dimensional array, since the padding has the same alias set
     as the field type, but if it's a multi-dimensional array, we need to
     see the inner types.  */
  while (TREE_CODE (gnu_old_type) == RECORD_TYPE
	 && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type)
	     || TYPE_PADDING_P (gnu_old_type)))
    gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type));

  /* Unconstrained array types are deemed incomplete and would thus be given
     alias set 0.  Retrieve the underlying array type.  */


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