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

 *                                                                          *

 *                         GNAT COMPILER COMPONENTS                         *

 *                                                                          *

 *                                 G I G I                                  *

 *                                                                          *

 *                              C Header File                               *

 *                                                                          *

 *          Copyright (C) 1992-2012, 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.      *

 *                                                                          *

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

/* Declare all functions and types used by gigi.  */

/* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada

   entity, this routine returns the equivalent GCC tree for that entity

   (an ..._DECL node) and associates the ..._DECL node with the input GNAT

   defining identifier.

   If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its

   initial value (in GCC tree form). This is optional for variables.

   For renamed entities, GNU_EXPR gives the object being renamed.

   DEFINITION is nonzero if this call is intended for a definition.  This is

   used for separate compilation where it necessary to know whether an

   external declaration or a definition should be created if the GCC equivalent

   was not created previously.  The value of 1 is normally used for a nonzero

   DEFINITION, but a value of 2 is used in special circumstances, defined in

   the code.  */

extern tree gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr,

                                int definition);

/* Similar, but if the returned value is a COMPONENT_REF, return the

   FIELD_DECL.  */

extern tree gnat_to_gnu_field_decl (Entity_Id gnat_entity);

/* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type.  Return

   the GCC type corresponding to that entity.  */

extern tree gnat_to_gnu_type (Entity_Id gnat_entity);

/* Wrap up compilation of T, a TYPE_DECL, possibly deferring it.  */

extern void rest_of_type_decl_compilation (tree t);

/* Start a new statement group chained to the previous group.  */

extern void start_stmt_group (void);

/* Add GNU_STMT to the current statement group.  If it is an expression with

   no effects, it is ignored.  */

extern void add_stmt (tree gnu_stmt);

/* Similar, but the statement is always added, regardless of side-effects.  */

extern void add_stmt_force (tree gnu_stmt);

/* Like add_stmt, but set the location of GNU_STMT to that of GNAT_NODE.  */

extern void add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node);

/* Similar, but the statement is always added, regardless of side-effects.  */

extern void add_stmt_with_node_force (tree gnu_stmt, Node_Id gnat_node);

/* Return code corresponding to the current code group.  It is normally

   a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if

   BLOCK or cleanups were set.  */

extern tree end_stmt_group (void);

/* Set the BLOCK node corresponding to the current code group to GNU_BLOCK.  */

extern void set_block_for_group (tree);

/* Add a declaration statement for GNU_DECL to the current BLOCK_STMT node.

   Get SLOC from GNAT_ENTITY.  */

extern void add_decl_expr (tree gnu_decl, Entity_Id gnat_entity);

/* Mark nodes rooted at T with TREE_VISITED and types as having their

   sized gimplified.  We use this to indicate all variable sizes and

   positions in global types may not be shared by any subprogram.  */

extern void mark_visited (tree t);

/* This macro calls the above function but short-circuits the common

   case of a constant to save time and also checks for NULL.  */

#define MARK_VISITED(EXP)               \

do {                                    \

  if((EXP) && !CONSTANT_CLASS_P (EXP))  \

    mark_visited (EXP);                 \

} while (0)

/* Finalize the processing of From_With_Type incomplete types.  */

extern void finalize_from_with_types (void);

/* Return the equivalent type to be used for GNAT_ENTITY, if it's a

   kind of type (such E_Task_Type) that has a different type which Gigi

   uses for its representation.  If the type does not have a special type

   for its representation, return GNAT_ENTITY.  If a type is supposed to

   exist, but does not, abort unless annotating types, in which case

   return Empty.   If GNAT_ENTITY is Empty, return Empty.  */

extern Entity_Id Gigi_Equivalent_Type (Entity_Id gnat_entity);

/* Given GNAT_ENTITY, elaborate all expressions that are required to

   be elaborated at the point of its definition, but do nothing else.  */

extern void elaborate_entity (Entity_Id gnat_entity);

/* Mark GNAT_ENTITY as going out of scope at this point.  Recursively mark

   any entities on its entity chain similarly.  */

extern void mark_out_of_scope (Entity_Id gnat_entity);

/* Get the unpadded version of a GNAT type.  */

extern tree get_unpadded_type (Entity_Id gnat_entity);

/* Return the DECL associated with the public subprogram GNAT_ENTITY but whose

   type has been changed to that of the parameterless procedure, except if an

   alias is already present, in which case it is returned instead.  */

extern tree get_minimal_subprog_decl (Entity_Id gnat_entity);

/* 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.  */

extern tree make_aligning_type (tree type, unsigned int align, tree size,

                                unsigned int base_align, int room);

/* Ensure that TYPE has SIZE and ALIGN.  Make and return a new padded type

   if needed.  We have already verified that SIZE and TYPE 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 we must complete the original type.

   DEFINITION is true if this type is being defined.  SAME_RM_SIZE is true

   if the RM size of the resulting type is to be set to SIZE too; otherwise,

   it's set to the RM size of the original type.  */

extern 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 same_rm_size);

/* Given a GNU tree and a GNAT list of choices, generate an expression to test

   the value passed against the list of choices.  */

extern tree choices_to_gnu (tree operand, Node_Id choices);

/* Given GNAT_ENTITY, an object (constant, variable, parameter, exception)

   and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the

   size and alignment used by Gigi.  Prefer SIZE over TYPE_SIZE if non-null.

   BY_REF is true if the object is used by reference and BY_DOUBLE_REF is

   true if the object is used by double reference.  */

extern void annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size,

                             bool by_ref, bool by_double_ref);

/* Return the variant part of RECORD_TYPE, if any.  Otherwise return NULL.  */

extern tree get_variant_part (tree record_type);

/* Given a type T, a FIELD_DECL F, and a replacement value R, return a new

   type with all size expressions that contain F updated by replacing F

   with R.  If F is NULL_TREE, always make a new RECORD_TYPE, even if

   nothing has changed.  */

extern tree substitute_in_type (tree t, tree f, tree r);

/* Return the RM size of GNU_TYPE.  This is the actual number of bits

   needed to represent the object.  */

extern tree rm_size (tree gnu_type);

/* Return the name to be used for GNAT_ENTITY.  If a type, create a

   fully-qualified name, possibly with type information encoding.

   Otherwise, return the name.  */

extern tree get_entity_name (Entity_Id gnat_entity);

/* Return an identifier representing the external name to be used for

   GNAT_ENTITY.  If SUFFIX is specified, the name is followed by "___"

   and the specified suffix.  */

extern tree create_concat_name (Entity_Id gnat_entity, const char *suffix);

/* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a

   string, return a new IDENTIFIER_NODE that is the concatenation of

   the name followed by "___" and the specified suffix.  */

extern tree concat_name (tree gnu_name, const char *suffix);

/* Highest number in the front-end node table.  */

extern int max_gnat_nodes;

/* Current node being treated, in case abort called.  */

extern Node_Id error_gnat_node;

/* True when gigi is being called on an analyzed but unexpanded

   tree, and the only purpose of the call is to properly annotate

   types with representation information.  */

extern bool type_annotate_only;

/* Current file name without path.  */

extern const char *ref_filename;

/* This structure must be kept synchronized with Call_Back_End.  */

struct File_Info_Type

{

  File_Name_Type File_Name;

  Nat Num_Source_Lines;

};

#ifdef __cplusplus

extern "C" {

#endif

/* This is the main program of the back-end.  It sets up all the table

   structures and then generates code.  */

extern void gigi (Node_Id gnat_root, int max_gnat_node,

                  int number_name ATTRIBUTE_UNUSED,

                  struct Node *nodes_ptr, Node_Id *next_node_ptr,

                  Node_Id *prev_node_ptr, struct Elist_Header *elists_ptr,

                  struct Elmt_Item *elmts_ptr,

                  struct String_Entry *strings_ptr,

                  Char_Code *strings_chars_ptr,

                  struct List_Header *list_headers_ptr,

                  Nat number_file,

                  struct File_Info_Type *file_info_ptr,

                  Entity_Id standard_boolean,

                  Entity_Id standard_integer,

                  Entity_Id standard_character,

                  Entity_Id standard_long_long_float,

                  Entity_Id standard_exception_type,

                  Int gigi_operating_mode);

#ifdef __cplusplus

}

#endif

/* GNAT_NODE is the root of some GNAT tree.  Return the root of the

   GCC tree corresponding to that GNAT tree.  Normally, no code is generated;

   we just return an equivalent tree which is used elsewhere to generate

   code.  */

extern tree gnat_to_gnu (Node_Id gnat_node);

/* GNU_STMT is a statement.  We generate code for that statement.  */

extern void gnat_expand_stmt (tree gnu_stmt);

/* Generate GIMPLE in place for the expression at *EXPR_P.  */

extern int gnat_gimplify_expr (tree *expr_p, gimple_seq *pre_p,

                               gimple_seq *post_p ATTRIBUTE_UNUSED);

/* Do the processing for the declaration of a GNAT_ENTITY, a type.  If

   a separate Freeze node exists, delay the bulk of the processing.  Otherwise

   make a GCC type for GNAT_ENTITY and set up the correspondence.  */

extern void process_type (Entity_Id gnat_entity);

/* Convert SLOC into LOCUS.  Return true if SLOC corresponds to a source code

   location and false if it doesn't.  In the former case, set the Gigi global

   variable REF_FILENAME to the simple debug file name as given by sinput.  */

extern bool Sloc_to_locus (Source_Ptr Sloc, location_t *locus);

/* Post an error message.  MSG is the error message, properly annotated.

   NODE is the node at which to post the error and the node to use for the

   '&' substitution.  */

extern void post_error (const char *msg, Node_Id node);

/* Similar to post_error, but NODE is the node at which to post the error and

   ENT is the node to use for the '&' substitution.  */

extern void post_error_ne (const char *msg, Node_Id node, Entity_Id ent);

/* Similar to post_error_ne, but NUM is the number to use for the '^'.  */

extern void post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent,

                               int num);

/* Similar to post_error_ne, but T is a GCC tree representing the number to

   write.  If T represents a constant, the text inside curly brackets in

   MSG will be output (presumably including a '^').  Otherwise it will not

   be output and the text inside square brackets will be output instead.  */

extern void post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent,

                                tree t);

/* Similar to post_error_ne_tree, but NUM is a second integer to write.  */

extern void post_error_ne_tree_2 (const char *msg, Node_Id node, Entity_Id ent,

                                  tree t, int num);

/* Return a label to branch to for the exception type in KIND or NULL_TREE

   if none.  */

extern tree get_exception_label (char kind);

/* Return the decl for the current elaboration procedure.  */

extern tree get_elaboration_procedure (void);

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

extern 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.  */

extern 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.  */

extern int double_scalar_alignment;

/* Data structures used to represent attributes.  */

enum attr_type

{

  ATTR_MACHINE_ATTRIBUTE,

  ATTR_LINK_ALIAS,

  ATTR_LINK_SECTION,

  ATTR_LINK_CONSTRUCTOR,

  ATTR_LINK_DESTRUCTOR,

  ATTR_THREAD_LOCAL_STORAGE,

  ATTR_WEAK_EXTERNAL

};

struct attrib

{

  struct attrib *next;

  enum attr_type type;

  tree name;

  tree args;

  Node_Id error_point;

};

/* Table of machine-independent internal attributes.  */

extern const struct attribute_spec gnat_internal_attribute_table[];

/* Define the entries in the standard data array.  */

enum standard_datatypes

{

  /* The longest floating-point type.  */

  ADT_longest_float_type,

  /* The type of an exception.  */

  ADT_except_type,

  /* Type declaration node  <==> typedef void *T */

  ADT_ptr_void_type,

  /* Function type declaration -- void T() */

  ADT_void_ftype,

  /* Type declaration node  <==> typedef void *T() */

  ADT_ptr_void_ftype,

  /* Type declaration node  <==> typedef virtual void *T() */

  ADT_fdesc_type,

  /* Null pointer for above type.  */

  ADT_null_fdesc,

  /* Value 1 in signed bitsizetype.  */

  ADT_sbitsize_one_node,

  /* Value BITS_PER_UNIT in signed bitsizetype.  */

  ADT_sbitsize_unit_node,

  /* Function declaration nodes for run-time functions for allocating memory.

     Ada allocators cause calls to these functions to be generated.  Malloc32

     is used only on 64bit systems needing to allocate 32bit memory.  */

  ADT_malloc_decl,

  ADT_malloc32_decl,

  /* Likewise for freeing memory.  */

  ADT_free_decl,

  /* Function decl node for 64-bit multiplication with overflow checking.  */

  ADT_mulv64_decl,

  /* Identifier for the name of the _Parent field in tagged record types.  */

  ADT_parent_name_id,

  /* Identifier for the name of the Exception_Data type.  */

  ADT_exception_data_name_id,

  /* Types and decls used by our temporary exception mechanism.  See

     init_gigi_decls for details.  */

  ADT_jmpbuf_type,

  ADT_jmpbuf_ptr_type,

  ADT_get_jmpbuf_decl,

  ADT_set_jmpbuf_decl,

  ADT_get_excptr_decl,

  ADT_setjmp_decl,

  ADT_longjmp_decl,

  ADT_update_setjmp_buf_decl,

  ADT_raise_nodefer_decl,

  ADT_reraise_zcx_decl,

  ADT_begin_handler_decl,

  ADT_end_handler_decl,

  ADT_others_decl,

  ADT_all_others_decl,

  ADT_LAST};

/* Define kind of exception information associated with raise statements.  */

enum exception_info_kind

{

  /* Simple exception information: file:line.  */

  exception_simple,

  /* Range exception information: file:line + index, first, last.  */

  exception_range,

  /* Column exception information: file:line:column.  */

  exception_column

};

extern GTY(()) tree gnat_std_decls[(int) ADT_LAST];

extern GTY(()) tree gnat_raise_decls[(int) LAST_REASON_CODE + 1];

extern GTY(()) tree gnat_raise_decls_ext[(int) LAST_REASON_CODE + 1];

#define longest_float_type_node gnat_std_decls[(int) ADT_longest_float_type]

#define except_type_node gnat_std_decls[(int) ADT_except_type]

#define ptr_void_type_node gnat_std_decls[(int) ADT_ptr_void_type]

#define void_ftype gnat_std_decls[(int) ADT_void_ftype]

#define ptr_void_ftype gnat_std_decls[(int) ADT_ptr_void_ftype]

#define fdesc_type_node gnat_std_decls[(int) ADT_fdesc_type]

#define null_fdesc_node gnat_std_decls[(int) ADT_null_fdesc]

#define sbitsize_one_node gnat_std_decls[(int) ADT_sbitsize_one_node]

#define sbitsize_unit_node gnat_std_decls[(int) ADT_sbitsize_unit_node]

#define malloc_decl gnat_std_decls[(int) ADT_malloc_decl]

#define malloc32_decl gnat_std_decls[(int) ADT_malloc32_decl]

#define free_decl gnat_std_decls[(int) ADT_free_decl]

#define mulv64_decl gnat_std_decls[(int) ADT_mulv64_decl]

#define parent_name_id gnat_std_decls[(int) ADT_parent_name_id]

#define exception_data_name_id gnat_std_decls[(int) ADT_exception_data_name_id]

#define jmpbuf_type gnat_std_decls[(int) ADT_jmpbuf_type]

#define jmpbuf_ptr_type gnat_std_decls[(int) ADT_jmpbuf_ptr_type]

#define get_jmpbuf_decl gnat_std_decls[(int) ADT_get_jmpbuf_decl]

#define set_jmpbuf_decl gnat_std_decls[(int) ADT_set_jmpbuf_decl]

#define get_excptr_decl gnat_std_decls[(int) ADT_get_excptr_decl]

#define setjmp_decl gnat_std_decls[(int) ADT_setjmp_decl]

#define longjmp_decl gnat_std_decls[(int) ADT_longjmp_decl]

#define update_setjmp_buf_decl gnat_std_decls[(int) ADT_update_setjmp_buf_decl]

#define raise_nodefer_decl gnat_std_decls[(int) ADT_raise_nodefer_decl]

#define reraise_zcx_decl gnat_std_decls[(int) ADT_reraise_zcx_decl]

#define begin_handler_decl gnat_std_decls[(int) ADT_begin_handler_decl]

#define others_decl gnat_std_decls[(int) ADT_others_decl]

#define all_others_decl gnat_std_decls[(int) ADT_all_others_decl]

#define end_handler_decl gnat_std_decls[(int) ADT_end_handler_decl]

/* Routines expected by the gcc back-end. They must have exactly the same

   prototype and names as below.  */

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

extern bool global_bindings_p (void);

/* Enter and exit a new binding level.  */

extern void gnat_pushlevel (void);

extern void gnat_poplevel (void);

extern void gnat_zaplevel (void);

/* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL

   and point FNDECL to this BLOCK.  */

extern void set_current_block_context (tree fndecl);

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

extern void set_block_jmpbuf_decl (tree decl);

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

extern tree get_block_jmpbuf_decl (void);

/* Record DECL as belonging to the current lexical scope and use GNAT_NODE

   for location information and flag propagation.  */

extern void gnat_pushdecl (tree decl, Node_Id gnat_node);

extern void gnat_init_gcc_eh (void);

extern void gnat_install_builtins (void);

/* Return an integer type with the number of bits of precision given by

   PRECISION.  UNSIGNEDP is nonzero if the type is unsigned; otherwise

   it is a signed type.  */

extern tree gnat_type_for_size (unsigned precision, int unsignedp);

/* Return a data type that has machine mode MODE.  UNSIGNEDP selects

   an unsigned type; otherwise a signed type is returned.  */

extern tree gnat_type_for_mode (enum machine_mode mode, int unsignedp);

/* Emit debug info for all global variable declarations.  */

extern void gnat_write_global_declarations (void);

/* Return the unsigned version of a TYPE_NODE, a scalar type.  */

extern tree gnat_unsigned_type (tree type_node);

/* Return the signed version of a TYPE_NODE, a scalar type.  */

extern tree gnat_signed_type (tree type_node);

/* Return 1 if the types T1 and T2 are compatible, i.e. if they can be

   transparently converted to each other.  */

extern int gnat_types_compatible_p (tree t1, tree t2);

/* Return true if EXPR is a useless type conversion.  */

extern bool gnat_useless_type_conversion (tree expr);

/* Return true if T, a FUNCTION_TYPE, has the specified list of flags.  */

extern bool fntype_same_flags_p (const_tree, tree, bool, bool, bool);

/* Create an expression whose value is that of EXPR,

   converted to type TYPE.  The TREE_TYPE of the value

   is always TYPE.  This function implements all reasonable

   conversions; callers should filter out those that are

   not permitted by the language being compiled.  */

extern tree convert (tree type, tree expr);

/* Create an expression whose value is that of EXPR converted to the common

   index type, which is sizetype.  */

extern tree convert_to_index_type (tree expr);

/* Routines created solely for the tree translator's sake. Their prototypes

   can be changed as desired.  */

/* Initialize the association of GNAT nodes to GCC trees.  */

extern void init_gnat_to_gnu (void);

/* GNAT_ENTITY is a GNAT tree node for a defining identifier.

   GNU_DECL is the GCC tree which is to be associated with

   GNAT_ENTITY. Such gnu tree node is always an ..._DECL node.

   If NO_CHECK is nonzero, the latter check is suppressed.

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

extern void save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl,

                           bool no_check);

/* GNAT_ENTITY is a GNAT tree node for a defining identifier.

   Return the ..._DECL node that was associated with it.  If there is no tree

   node associated with GNAT_ENTITY, abort.  */

extern tree get_gnu_tree (Entity_Id gnat_entity);

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

extern bool present_gnu_tree (Entity_Id gnat_entity);

/* Initialize the association of GNAT nodes to GCC trees as dummies.  */

extern void init_dummy_type (void);

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

extern tree make_dummy_type (Entity_Id gnat_type);

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

extern tree get_dummy_type (Entity_Id 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.  */

extern void build_dummy_unc_pointer_types (Entity_Id gnat_desig_type,

                                           tree gnu_desig_type);

/* Record TYPE as a builtin type for Ada.  NAME is the name of the type.

   ARTIFICIAL_P is true if it's a type that was generated by the compiler.  */

extern void record_builtin_type (const char *name, tree type,

                                 bool artificial_p);

/* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST,

   finish constructing the record type as a fat pointer type.  */

extern void finish_fat_pointer_type (tree record_type, tree field_list);

/* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST,

   finish constructing the record or union type.  If REP_LEVEL is zero, this

   record has no representation clause and so will be entirely laid out here.

   If REP_LEVEL is one, this record has a representation clause and has been

   laid out already; only set the sizes and alignment.  If REP_LEVEL is two,

   this record is derived from a parent record and thus inherits its layout;

   only make a pass on the fields to finalize them.  DEBUG_INFO_P is true if

   we need to write debug information about this type.  */

extern void finish_record_type (tree record_type, tree field_list,

                                int rep_level, bool debug_info_p);

/* Wrap up compilation of RECORD_TYPE, i.e. output all the debug information

   associated with it.  It need not be invoked directly in most cases since

   finish_record_type takes care of doing so, but this can be necessary if

   a parallel type is to be attached to the record type.  */

extern void rest_of_record_type_compilation (tree record_type);

/* Append PARALLEL_TYPE on the chain of parallel types for decl.  */

extern void add_parallel_type (tree decl, tree parallel_type);

/* Return a FUNCTION_TYPE node.  RETURN_TYPE is the type returned by the

   subprogram.  If it is VOID_TYPE, then we are dealing with a procedure,

   otherwise we are dealing with a function.  PARAM_DECL_LIST is a list of

   PARM_DECL nodes that are the subprogram parameters.  CICO_LIST is the

   copy-in/copy-out list to be stored into the TYPE_CICO_LIST field.

   RETURN_UNCONSTRAINED_P is true if the function returns an unconstrained

   object.  RETURN_BY_DIRECT_REF_P is true if the function returns by direct

   reference.  RETURN_BY_INVISI_REF_P is true if the function returns by

   invisible reference.  */

extern tree create_subprog_type (tree return_type, tree param_decl_list,

                                 tree cico_list, bool return_unconstrained_p,

                                 bool return_by_direct_ref_p,

                                 bool return_by_invisi_ref_p);

/* Return a copy of TYPE, but safe to modify in any way.  */

extern tree copy_type (tree type);

/* Return a subtype of sizetype with range MIN to MAX and whose

   TYPE_INDEX_TYPE is INDEX.  GNAT_NODE is used for the position

   of the associated TYPE_DECL.  */

extern tree create_index_type (tree min, tree max, tree index,

                               Node_Id gnat_node);

/* Return a subtype of TYPE with range MIN to MAX.  If TYPE is NULL,

   sizetype is used.  */

extern tree create_range_type (tree type, tree min, tree max);

/* Return a TYPE_DECL node suitable for the TYPE_STUB_DECL field of a type.

   TYPE_NAME gives the name of the type and TYPE is a ..._TYPE node giving

   its data type.  */

extern tree create_type_stub_decl (tree type_name, tree type);

/* Return a TYPE_DECL node.  TYPE_NAME gives the name of the type and TYPE

   is a ..._TYPE node giving its data type.  ARTIFICIAL_P is true if this

   is a declaration that was generated by the compiler.  DEBUG_INFO_P is

   true if we need to write debug information about this type.  GNAT_NODE

   is used for the position of the decl.  */

extern tree create_type_decl (tree type_name, tree type,

                              struct attrib *attr_list,

                              bool artificial_p, bool debug_info_p,

                              Node_Id gnat_node);

/* Return a VAR_DECL or CONST_DECL node.

   VAR_NAME gives the name of the variable.  ASM_NAME is its assembler name

   (if provided).  TYPE is its data type (a GCC ..._TYPE node).  VAR_INIT is

   the GCC tree for an optional initial expression; NULL_TREE if none.

   CONST_FLAG is true if this variable is constant, in which case we might

   return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false.

   PUBLIC_FLAG is true if this definition is to be made visible outside of

   the current compilation unit. This flag should be set when processing the

   variable definitions in a package specification.

   EXTERN_FLAG is nonzero when processing an external variable declaration (as

   opposed to a definition: no storage is to be allocated for the variable).

   STATIC_FLAG is only relevant when not at top level.  In that case

   it indicates whether to always allocate storage to the variable.

   GNAT_NODE is used for the position of the decl.  */

extern tree

create_var_decl_1 (tree var_name, tree asm_name, tree type, tree var_init,

                   bool const_flag, bool public_flag, bool extern_flag,

                   bool static_flag, bool const_decl_allowed_p,

                   struct attrib *attr_list, Node_Id gnat_node);

/* Wrapper around create_var_decl_1 for cases where we don't care whether

   a VAR or a CONST decl node is created.  */

#define create_var_decl(var_name, asm_name, type, var_init,     \

                        const_flag, public_flag, extern_flag,   \

                        static_flag, attr_list, gnat_node)      \

  create_var_decl_1 (var_name, asm_name, type, var_init,        \

                     const_flag, public_flag, extern_flag,      \

                     static_flag, true, attr_list, gnat_node)

/* Wrapper around create_var_decl_1 for cases where a VAR_DECL node is

   required.  The primary intent is for DECL_CONST_CORRESPONDING_VARs, which

   must be VAR_DECLs and on which we want TREE_READONLY set to have them

   possibly assigned to a readonly data section.  */

#define create_true_var_decl(var_name, asm_name, type, var_init,        \

                             const_flag, public_flag, extern_flag,      \

                             static_flag, attr_list, gnat_node)         \

  create_var_decl_1 (var_name, asm_name, type, var_init,                \

                     const_flag, public_flag, extern_flag,              \

                     static_flag, false, attr_list, gnat_node)

/* Record DECL as a global renaming pointer.  */

extern void record_global_renaming_pointer (tree decl);

/* Invalidate the global renaming pointers.  */

extern void invalidate_global_renaming_pointers (void);

/* Return a FIELD_DECL node.  FIELD_NAME is the field's name, FIELD_TYPE is

   its type and RECORD_TYPE is the type of the enclosing record.  If SIZE is

   nonzero, it is the specified size of the field.  If POS is nonzero, it is

   the bit position.  PACKED is 1 if the enclosing record is packed, -1 if it

   has Component_Alignment of Storage_Unit.  If ADDRESSABLE is nonzero, it

   means we are allowed to take the address of the field; if it is negative,

   we should not make a bitfield, which is used by make_aligning_type.  */

extern tree create_field_decl (tree field_name, tree field_type,

                               tree record_type, tree size, tree pos,

                               int packed, int addressable);

/* Return a PARM_DECL node.  PARAM_NAME is the name of the parameter and

   PARAM_TYPE is its type.  READONLY is true if the parameter is readonly

   (either an In parameter or an address of a pass-by-ref parameter).  */

extern tree create_param_decl (tree param_name, tree param_type,

                               bool readonly);

/* Return a LABEL_DECL with LABEL_NAME.  GNAT_NODE is used for the position

   of the decl.  */

extern tree create_label_decl (tree, Node_Id);

/* Return a FUNCTION_DECL node.  SUBPROG_NAME is the name of the subprogram,

   ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE

   node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of

   PARM_DECL nodes chained through the DECL_CHAIN field).

   INLINE_FLAG, PUBLIC_FLAG, EXTERN_FLAG, ARTIFICIAL_FLAG and ATTR_LIST are

   used to set the appropriate fields in the FUNCTION_DECL.  GNAT_NODE is

   used for the position of the decl.  */

extern tree create_subprog_decl (tree subprog_name, tree asm_name,

                                 tree subprog_type, tree param_decl_list,

                                 bool inline_flag, bool public_flag,

                                 bool extern_flag, bool artificial_flag,

                                 struct attrib *attr_list, Node_Id gnat_node);

/* Set up the framework for generating code for SUBPROG_DECL, a subprogram

   body. This routine needs to be invoked before processing the declarations

   appearing in the subprogram.  */

extern void begin_subprog_body (tree subprog_decl);

/* Finish translating the current subprogram and set its BODY.  */

extern void end_subprog_body (tree body);

/* Wrap up compilation of SUBPROG_DECL, a subprogram body.  */

extern void rest_of_subprog_body_compilation (tree subprog_decl);

/* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE.

   EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs.

   Return a constructor for the template.  */

extern tree build_template (tree template_type, tree array_type, tree expr);

/* Build a 64bit VMS descriptor from a Mechanism_Type, which must specify

   a descriptor type, and the GCC type of an object.  Each FIELD_DECL

   in the type contains in its DECL_INITIAL the expression to use when

   a constructor is made for the type.  GNAT_ENTITY is a gnat node used

   to print out an error message if the mechanism cannot be applied to

   an object of that type and also for the name.  */

extern tree build_vms_descriptor (tree type, Mechanism_Type mech,

                                  Entity_Id gnat_entity);

/* Build a 32bit VMS descriptor from a Mechanism_Type. See above.  */

extern tree build_vms_descriptor32 (tree type, Mechanism_Type mech,

                                  Entity_Id gnat_entity);

/* Build a type to be used to represent an aliased object whose nominal type

   is an unconstrained array.  This consists of a RECORD_TYPE containing a

   field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an ARRAY_TYPE.

   If ARRAY_TYPE is that of an unconstrained array, this is used to represent

   an arbitrary unconstrained object.  Use NAME as the name of the record.

   DEBUG_INFO_P is true if we need to write debug information for the type.  */

extern tree build_unc_object_type (tree template_type, tree object_type,

                                   tree name, bool debug_info_p);

/* Same as build_unc_object_type, but taking a thin or fat pointer type

   instead of the template type.  */

extern tree build_unc_object_type_from_ptr (tree thin_fat_ptr_type,

                                            tree object_type, tree name,

                                            bool debug_info_p);

/* Shift the component offsets within an unconstrained object TYPE to make it

   suitable for use as a designated type for thin pointers.  */

extern void shift_unc_components_for_thin_pointers (tree type);

/* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE.  In

   the normal case this is just two adjustments, but we have more to do

   if NEW is an UNCONSTRAINED_ARRAY_TYPE.  */

extern void update_pointer_to (tree old_type, tree new_type);

/* EXP is an expression for the size of an object.  If this size contains

   discriminant references, replace them with the maximum (if MAX_P) or

   minimum (if !MAX_P) possible value of the discriminant.  */

extern tree max_size (tree exp, bool max_p);

/* Remove all conversions that are done in EXP.  This includes converting

   from a padded type or to a left-justified modular type.  If TRUE_ADDRESS

   is true, always return the address of the containing object even if

   the address is not bit-aligned.  */

extern tree remove_conversions (tree exp, bool true_address);

/* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that

   refers to the underlying array.  If its type has TYPE_CONTAINS_TEMPLATE_P,

   likewise return an expression pointing to the underlying array.  */

extern tree maybe_unconstrained_array (tree exp);

/* If EXP's type is a VECTOR_TYPE, return EXP converted to the associated

   TYPE_REPRESENTATIVE_ARRAY.  */

extern tree maybe_vector_array (tree exp);

/* Return an expression that does an unchecked conversion of EXPR to TYPE.

   If NOTRUNC_P is true, truncation operations should be suppressed.  */

extern tree unchecked_convert (tree type, tree expr, bool notrunc_p);

/* Return the appropriate GCC tree code for the specified GNAT_TYPE,

   the latter being a record type as predicated by Is_Record_Type.  */

extern enum tree_code tree_code_for_record_type (Entity_Id gnat_type);

/* Return true if GNAT_TYPE is a "double" floating-point type, i.e. whose

   size is equal to 64 bits, or an array of such a type.  Set ALIGN_CLAUSE

   according to the presence of an alignment clause on the type or, if it

   is an array, on the component type.  */

extern bool is_double_float_or_array (Entity_Id gnat_type,

                                      bool *align_clause);

/* Return true if GNAT_TYPE is a "double" or larger scalar type, i.e. whose

   size is greater or equal to 64 bits, or an array of such a type.  Set