sym.c File Reference

#include "flexdef.h"

Include dependency graph for sym.c:

Go to the source code of this file.

Functions
int	hashfunct (char[], int)
struct hash_entry *	findsym (char *sym, struct hash_entry **table, int table_size)
int	addsym (char *sym, char *str_def, int int_def, struct hash_entry **table, int table_size)
void	cclinstal (Char *ccltxt, int cclnum)
int	ccllookup (Char *ccltxt)
int	hashfunct (char *str, int hash_size)
void	ndinstal (char *nd, Char *def)
Char *	ndlookup (char *nd)
void	scinstal (char *str, int xcluflg)
int	sclookup (char *str)

Variables
struct hash_entry *	ndtbl [NAME_TABLE_HASH_SIZE]
struct hash_entry *	sctbl [START_COND_HASH_SIZE]
struct hash_entry *	ccltab [CCL_HASH_SIZE]

Function Documentation

int addsym	(	char *	sym,
		char *	str_def,
		int	int_def,
		struct hash_entry **	table,
		int	table_size
	)

Definition at line 64 of file sym.c.

{
    int hash_val = hashfunct( sym, table_size );
    struct hash_entry *sym_entry = table[hash_val];
    struct hash_entry *new_entry;
    struct hash_entry *successor;

    while ( sym_entry )
        {
        if ( ! strcmp( sym, sym_entry->name ) )
            { /* entry already exists */
            return ( -1 );
            }

        sym_entry = sym_entry->next;
        }

    /* create new entry */
    new_entry = (struct hash_entry *) malloc( sizeof( struct hash_entry ) );

    if ( new_entry == NULL )
        flexfatal( "symbol table memory allocation failed" );

    if ( (successor = table[hash_val]) )
        {
        new_entry->next = successor;
        successor->prev = new_entry;
        }
    else
        new_entry->next = NULL;

    new_entry->prev = NULL;
    new_entry->name = sym;
    new_entry->str_val = str_def;
    new_entry->int_val = int_def;

    table[hash_val] = new_entry;

    return ( 0 );
    }

void cclinstal	(	Char *	ccltxt,
		int	cclnum
	)

Definition at line 114 of file sym.c.

{
    /* we don't bother checking the return status because we are not called
     * unless the symbol is new
     */
    Char *copy_unsigned_string();

    (void) addsym( (char *) copy_unsigned_string( ccltxt ), (char *) 0, cclnum,
                   ccltab, CCL_HASH_SIZE );
    }

int ccllookup

(

Char *

ccltxt

)

Definition at line 134 of file sym.c.

{
    return ( findsym( (char *) ccltxt, ccltab, CCL_HASH_SIZE )->int_val );
    }

struct hash_entry * findsym	(	char *	sym,
		struct hash_entry **	table,
		int	table_size
	)

Definition at line 150 of file sym.c.

{
    struct hash_entry *sym_entry = table[hashfunct( sym, table_size )];
    static struct hash_entry empty_entry =
        {
        (struct hash_entry *) 0, (struct hash_entry *) 0, NULL, NULL, 0,
        } ;

    while ( sym_entry )
        {
        if ( ! strcmp( sym, sym_entry->name ) )
            return ( sym_entry );
        sym_entry = sym_entry->next;
        }

    return ( &empty_entry );
    }

int hashfunct	(	char	[],
		int
	)

int hashfunct	(	char *	str,
		int	hash_size
	)

Definition at line 177 of file sym.c.

{
    int hashval;
    int locstr;

    hashval = 0;
    locstr = 0;

    while ( str[locstr] )
        hashval = ((hashval << 1) + str[locstr++]) % hash_size;

    return ( hashval );
    }

void ndinstal	(	char *	nd,
		Char *	def
	)

Definition at line 200 of file sym.c.

{
    char *copy_string();
    Char *copy_unsigned_string();

    if ( addsym( copy_string( nd ), (char *) copy_unsigned_string( def ), 0,
                 ndtbl, NAME_TABLE_HASH_SIZE ) )
        synerr( "name defined twice" );
    }

Char* ndlookup

(

char *

nd

)

Definition at line 219 of file sym.c.

{
    return ( (Char *) findsym( nd, ndtbl, NAME_TABLE_HASH_SIZE )->str_val );
    }

void scinstal	(	char *	str,
		int	xcluflg
	)

Definition at line 236 of file sym.c.

{
    char *copy_string();

    /* bit of a hack.  We know how the default start-condition is
     * declared, and don't put out a define for it, because it
     * would come out as "#define 0 1"
     */
    /* actually, this is no longer the case.  The default start-condition
     * is now called "INITIAL".  But we keep the following for the sake
     * of future robustness.
     */

    if ( strcmp( str, "0" ) )
        printf( "#define %s %d\n", str, lastsc );

    if ( ++lastsc >= current_max_scs )
        {
        current_max_scs += MAX_SCS_INCREMENT;

        ++num_reallocs;

        scset = reallocate_integer_array( scset, current_max_scs );
        scbol = reallocate_integer_array( scbol, current_max_scs );
        scxclu = reallocate_integer_array( scxclu, current_max_scs );
        sceof = reallocate_integer_array( sceof, current_max_scs );
        scname = reallocate_char_ptr_array( scname, current_max_scs );
        actvsc = reallocate_integer_array( actvsc, current_max_scs );
        }

    scname[lastsc] = copy_string( str );

    if ( addsym( scname[lastsc], (char *) 0, lastsc,
                 sctbl, START_COND_HASH_SIZE ) )
        format_pinpoint_message( "start condition %s declared twice", str );

    scset[lastsc] = mkstate( SYM_EPSILON );
    scbol[lastsc] = mkstate( SYM_EPSILON );
    scxclu[lastsc] = xcluflg;
    sceof[lastsc] = false;
    }

int sclookup

(

char *

str

)

Definition at line 287 of file sym.c.

{
    return ( findsym( str, sctbl, START_COND_HASH_SIZE )->int_val );
    }

Variable Documentation

struct hash_entry* ccltab[CCL_HASH_SIZE]

Definition at line 47 of file sym.c.

struct hash_entry* ndtbl[NAME_TABLE_HASH_SIZE]

Definition at line 45 of file sym.c.

struct hash_entry* sctbl[START_COND_HASH_SIZE]

Definition at line 46 of file sym.c.