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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

#ifndef TYPES_INCLUDED

#define TYPES_INCLUDED

/*

    ELEMENTARY TYPES

    The types boolean, byte and pointer are defined.

*/

typedef char boolean ;

typedef unsigned char byte ;

#if FS_PTR_VOID

typedef void *pointer ;

#else

typedef char *pointer ;

#endif

/*

    FORWARD STRUCTURE DECLARATION

    The structure representing a TDF construct is defined recursively.

*/

struct x_construct ;

/*

    TYPE REPRESENTING A SORT NAME

    Each TDF construct has an associated sort.  This is represented

    by a value of type sortname.  It can take any of the values of

    the form sort_* in tags.h.

*/

typedef int sortname ;

/*

    TYPE REPRESENTING A TREE NODE

    TDF is represented as a tree structure.  Each node has a corresponding

    construct given by the cons field.  The son and bro fields give the

    tree its structure.  For shape checking there is also a shape field

    which is itself a node.

*/

typedef struct x_node {

    struct x_construct *cons ;

    struct x_node *son ;

    struct x_node *bro ;

    struct x_node *shape ;

} node ;

/*

    TYPE REPRESENTING AN ALIGNMENT TAG

    The only information required about an alignment tag is its

    definition (if any).

*/

typedef struct x_al_tag_info {

    node *def ;

} al_tag_info ;

/*

    TYPE REPRESENTING A TAG

    A tag may be a variable or identity (indicated by the var field).

    It may also be declared and defined.  The vis field is used to

    try to catch variables declared with visible access.

*/

typedef struct x_tag_info {

    boolean var ;

    boolean vis ;

    node *dec ;

    node *def ;

} tag_info ;

/*

    TYPE REPRESENTING A TOKEN

    A token may be declared or defined.  Its result sort is represented

    by the res field, and its argument sorts by the args field.  The

    formal parameters for a defined token are given as an array of

    constructs by the pars field.

*/

typedef struct x_tok_info {

    boolean dec ;

    sortname res ;

    char *args ;

    node *sig ;

    node *def ;

    int depth ;

    struct x_construct **pars ;

} tok_info ;

/*

    TYPE REPRESENTING A TDF CONSTRUCT

    A TDF construct (including user defined tokens and tags as well

    as the base constructs) is represented by the type construct.

    This consists of its sort, sortnum, its encoding, its internal

    and external names, plus space for extra information depending

    on its sort.  The next field enables us to form constructs into

    lists.

*/

typedef struct x_construct {

    sortname sortnum ;

    long encoding ;

    char *name ;

    node *ename ;

    struct x_construct *alias ;

    struct x_construct *next ;

    union {

	char *char_u ;

	al_tag_info al_tag_u ;

	tag_info tag_u ;

	tok_info tok_u ;

    } u ;

} construct ;

/*

    MACROS FOR ACCESSING INFO FIELDS OF A CONSTRUCT

    The following macros access the various field of the extra

    information union of a construct.  These macros should always

    be used - the fields should not be addressed directly.

*/

#define get_char_info( X )	( ( X )->u.char_u )

#define get_al_tag_info( X )	( &( ( X )->u.al_tag_u ) )

#define get_tag_info( X )	( &( ( X )->u.tag_u ) )

#define get_tok_info( X )	( &( ( X )->u.tok_u ) )

/*

    TYPE REPRESENTING A DIRECTORY

    In order to search for included files, the directory structure

    enables us to form lists of directory names.

*/

typedef struct x_directory {

    char *dirname ;

    struct x_directory *next ;

} directory ;

#endif