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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.
*/
#include "config.h"
#include "types.h"
#include "help.h"
#include "high.h"
#include "table.h"
#include "tdf.h"
#include "utility.h"
/*
HASHING FUNCTION
This routine is used to construct the hash tables. It takes a
string s and returns a value in the range 0 <= n < hash_size.
*/
static int hash
PROTO_N ( ( s ) )
PROTO_T ( char *s )
{
int n = 0 ;
for ( ; *s ; s++ ) n += *s ;
return ( n % hash_size ) ;
}
/*
CONSTRUCT TABLES
There are a number of tables of constructs. cons_table is the
table of all built-in constructs (arranged by sort and encoding),
and var_table of all user defined constructs. The tables
cons_hash_tables and var_hash_tables give the corresponding
hash tables (arranged by sort). The table cons_sizes gives
the number of built-in constructs of each sort.
*/
construct **var_table ;
construct **cons_table ;
static int *cons_sizes ;
construct **cons_hash_tables ;
static construct **var_hash_tables ;
/*
SORT INFORMATION TABLES
These tables give information on the various sorts, namely, the
number of them created, their decode letters, the number of bits
in their encoding, the encoding of their "apply_token" construct,
and the number of them removed from the hash tables.
*/
long *sort_count ;
char *sort_letters ;
int *sort_encoding ;
int *sort_extension ;
long *sort_tokens ;
long *sort_conds ;
long *sort_removed ;
decode_func *sort_decode ;
read_func *sort_read ;
/*
CREATE A TABLE FOR A NEW SORT
A table of sz constructs of sort s is created and cleared.
*/
void new_sort
PROTO_N ( ( s, sz ) )
PROTO_T ( sortname s X int sz )
{
int i ;
construct *p = alloc_nof ( construct, sz ) ;
for ( i = 0 ; i < sz ; i++ ) {
( p + i )->sortnum = s ;
( p + i )->encoding = i ;
( p + i )->name = null ;
( p + i )->next = null ;
get_char_info ( p + i ) = null ;
}
cons_table [s] = p ;
cons_sizes [s] = ( int ) sz ;
return ;
}
/*
PUT A NAME INTO A CONSTRUCT
The nth construct of sort s is set to have name nm and argument
string args.
*/
void new_cons
PROTO_N ( ( nm, s, n, args ) )
PROTO_T ( char *nm X sortname s X int n X char *args )
{
construct *p = cons_no ( s, n ) ;
p->name = nm ;
if ( add_to_cons_hash ( p, s ) ) {
fatal_error ( "Construct %s already defined", nm ) ;
}
get_char_info ( p ) = args ;
return ;
}
/*
DUMMY DECODING FUNCTION
This routine is a dummy which is used for uninitialised decode functions.
*/
static node *de_dummy
PROTO_Z ()
{
fatal_error ( "Invalid decode function" ) ;
return ( null ) ;
}
/*
DUMMY READING FUNCTION
This routine is a dummy which is used for uninitialised read functions.
*/
static node *read_dummy
PROTO_N ( ( n ) )
PROTO_T ( long n )
{
fatal_error ( "Invalid read function" ) ;
UNUSED ( n ) ;
return ( null ) ;
}
/*
INITIALIZE CONSTRUCT TABLES
The various construct and sort tables are initialized.
*/
void init_tables
PROTO_Z ()
{
int i ;
/* Allocate tables */
cons_table = alloc_nof ( construct *, SORT_no ) ;
cons_sizes = alloc_nof ( int, SORT_no ) ;
cons_hash_tables = alloc_nof ( construct *, SORT_no * hash_size ) ;
var_table = alloc_nof ( construct *, SORT_no ) ;
var_hash_tables = alloc_nof ( construct *, SORT_no * hash_size ) ;
sort_count = alloc_nof ( long, SORT_no ) ;
sort_letters = alloc_nof ( char, SORT_no + 1 ) ;
sort_encoding = alloc_nof ( int, SORT_no ) ;
sort_extension = alloc_nof ( int, SORT_no ) ;
sort_tokens = alloc_nof ( long, SORT_no ) ;
sort_conds = alloc_nof ( long, SORT_no ) ;
sort_removed = alloc_nof ( long, SORT_no ) ;
sort_decode = alloc_nof ( decode_func, SORT_no ) ;
sort_read = alloc_nof ( read_func, SORT_no ) ;
/* Clear out tables */
for ( i = 0 ; i < SORT_no ; i++ ) {
cons_table [i] = null ;
cons_sizes [i] = 0 ;
var_table [i] = null ;
sort_count [i] = 0 ;
sort_letters [i] = 'F' ;
sort_encoding [i] = 0 ;
sort_extension [i] = 0 ;
sort_tokens [i] = -2 ;
sort_conds [i] = -2 ;
sort_removed [i] = 0 ;
sort_decode [i] = de_dummy ;
sort_read [i] = read_dummy ;
}
sort_letters [ SORT_no ] = 0 ;
/* Initialize construct hash tables */
for ( i = 0 ; i < SORT_no * hash_size ; i++ ) {
cons_hash_tables [i] = null ;
var_hash_tables [i] = null ;
}
return ;
}
/*
SPECIAL CONSTRUCTS
These constructs are predefined.
*/
construct bytestream_cons = { SORT_bytestream, 0, null, null, null } ;
construct false_cons = { SORT_tdfbool, 0, null, null, null } ;
construct optional_cons = { SORT_option, 0, null, null, null } ;
construct string_cons = { SORT_tdfstring, -1, null, null, null } ;
construct token_cons = { SORT_token, 0, null, null, null } ;
construct true_cons = { SORT_tdfbool, 1, null, null, null } ;
construct unknown_cons = { SORT_unknown, 0, "....", null, null } ;
construct exp_shape = { SORT_exp, 0, "~exp_with_shape", null, null } ;
construct shape_of = { SORT_shape, -1, "~shape_of", null, null } ;
/*
OUTPUT OPTIONS
These flags give information on the form of the output.
*/
boolean show_tokdecs = 1 ;
boolean show_tokdefs = 1 ;
boolean show_aldecs = 1 ;
boolean show_aldefs = 1 ;
boolean show_tagdecs = 1 ;
boolean show_tagdefs = 1 ;
/*
FIND THE NAME OF A GIVEN SORT
Given the sort s, this routine returns the name of s.
*/
char *sort_name
PROTO_N ( ( s ) )
PROTO_T ( sortname s )
{
if ( is_high ( s ) ) {
high_sort *h = high_sorts + high_no ( s ) ;
return ( h->name ) ;
} else if ( s == SORT_unknown || s < 0 ) {
return ( "...." ) ;
} else {
construct *p = cons_no ( SORT_sortname, s ) ;
return ( p->name ) ;
}
}
/*
ADD A NAME TO A CONSTRUCT HASH TABLE
The construct p of sort s is added to the built-in construct hash
table. The routine returns a pointer to any existing entry of
the same name, or null otherwise.
*/
construct *add_to_cons_hash
PROTO_N ( ( p, s ) )
PROTO_T ( construct *p X sortname s )
{
construct *q ;
int n = hash ( p->name ) ;
construct *h = cons_hash_tables [ hash_size * s + n ] ;
for ( q = h ; q != null ; q = q->next ) {
if ( streq ( p->name, q->name ) ) return ( q ) ;
}
p->next = h ;
cons_hash_tables [ hash_size * s + n ] = p ;
return ( null ) ;
}
/*
LOOK UP A NAME IN A CONSTRUCT HASH TABLE
A construct with name p and sort s is looked up in the built-in
construct hash table. The routine returns a pointer to the
construct if it is found, or null otherwise.
*/
construct *search_cons_hash
PROTO_N ( ( p, s ) )
PROTO_T ( char *p X sortname s )
{
construct *q ;
int n = hash ( p ) ;
construct *h = cons_hash_tables [ hash_size * s + n ] ;
for ( q = h ; q != null ; q = q->next ) {
if ( streq ( p, q->name ) ) return ( q ) ;
}
return ( null ) ;
}
/*
ADD A NAME TO A VARIABLE HASH TABLE
The construct p of sort s is added to the user-defined construct
hash table. The routine returns a pointer to any existing entry
of the same name, or null otherwise.
*/
construct *add_to_var_hash
PROTO_N ( ( p, s ) )
PROTO_T ( construct *p X sortname s )
{
construct *q ;
int n = hash ( p->name ) ;
construct *h = var_hash_tables [ hash_size * s + n ] ;
for ( q = h ; q != null ; q = q->next ) {
if ( streq ( p->name, q->name ) ) return ( q ) ;
}
p->next = h ;
var_hash_tables [ hash_size * s + n ] = p ;
return ( null ) ;
}
/*
LOOK UP A NAME IN A VARIABLE HASH TABLE
A construct with name p and sort s is looked up in the user-defined
construct hash table. The routine returns a pointer to the construct
if it is found, or null otherwise.
*/
construct *search_var_hash
PROTO_N ( ( p, s ) )
PROTO_T ( char *p X sortname s )
{
construct *q ;
int n = hash ( p ) ;
construct *h = var_hash_tables [ hash_size * s + n ] ;
for ( q = h ; q != null ; q = q->next ) {
if ( streq ( p, q->name ) ) return ( q ) ;
}
return ( null ) ;
}
/*
LIST OF ALL REMOVED CONSTRUCTS
All constructs removed from the user-defined construct hash table
are formed into a list. This is used in node.c to form the
completion of a node.
*/
construct *removals = null ;
/*
REMOVE A NAME FROM A VARIABLE HASH TABLE
The construct with name p and sort s is removed from the
user-defined hash table and added to the removals list. There
is no error if the construct does not exist.
*/
void remove_var_hash
PROTO_N ( ( p, s ) )
PROTO_T ( char *p X sortname s )
{
int n = hash ( p ) ;
construct *h = var_hash_tables [ hash_size * s + n ] ;
if ( h == null ) return ;
if ( streq ( p, h->name ) ) {
/* It is the first element */
var_hash_tables [ hash_size * s + n ] = h->next ;
h->next = removals ;
removals = h ;
( sort_removed [s] )++ ;
return ;
}
while ( h->next ) {
if ( streq ( p, h->next->name ) ) {
/* It is a subsequent element */
construct *q = h->next->next ;
h->next->next = removals ;
removals = h->next ;
h->next = q ;
( sort_removed [s] )++ ;
return ;
}
h = h->next ;
}
/* Not found */
return ;
}
/*
SORT A HASH TABLE
The constructs of sort s in the hash table tab are sorted into
alphabetical order. They are formed into a list where the
constructs with hash value 0 should be. After sorting the hash
table cannot be used.
*/
void sort_table
PROTO_N ( ( tab, s ) )
PROTO_T ( construct **tab X sortname s )
{
int i ;
construct *q = null ;
for ( i = 0 ; i < hash_size ; i++ ) {
construct *p = tab [ hash_size * s + i ] ;
tab [ hash_size * s + i ] = null ;
while ( p ) {
construct *p_next = p->next ;
construct *r_last = null, *r = q ;
p->next = null ;
while ( r && strcmp ( r->name, p->name ) < 0 ) {
r_last = r ;
r = r->next ;
}
if ( r_last == null ) {
p->next = q ;
q = p ;
} else {
r_last->next = p ;
p->next = r ;
}
p = p_next ;
}
}
tab [ hash_size * s ] = q ;
return ;
}
/*
FLAG
This flag may be set to false to prevent sort_all sorting its
tables.
*/
boolean order_names = 1 ;
/*
SORTING ROUTINE
The user-defined alignment tags, tags and tokens are sorted into
alphabetical order.
*/
void sort_all
PROTO_Z ()
{
if ( order_names ) {
sort_table ( var_hash_tables, SORT_al_tag ) ;
sort_table ( var_hash_tables, SORT_tag ) ;
sort_table ( var_hash_tables, SORT_token ) ;
}
return ;
}
/*
APPLY A PROCEDURE TO ALL CONSTRUCTS
The routine f is applied to all user-defined constructs of sort s
by scanning across the hash table.
*/
void apply_to_all
PROTO_N ( ( f, s ) )
PROTO_T ( apply_func f X sortname s )
{
int i ;
for ( i = 0 ; i < hash_size ; i++ ) {
construct *p = var_hash_tables [ hash_size * s + i ] ;
while ( p ) {
construct *q = p->next ;
( *f ) ( p ) ;
p = q ;
}
}
return ;
}