145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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#ifndef lint
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static char rcsid[] = "$Header$";
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#endif
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/*
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* Symbol table management.
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*/
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#include <out.h>
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#include "const.h"
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#include "memory.h"
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#include "debug.h"
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/*
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* Symbol table types. Each hash table entry contains the offset of a symbol
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* struct. `Sy_name' contains the offset the name in the piece of global
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* names. `Sy_next' contains the offset of the next symbol of which the
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* corresponding name has the same hash value.
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*/
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struct symbol {
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ind_t sy_name;
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ind_t sy_next;
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};
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#define NHASH 307 /* Size of hash table. Must be odd. */
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static ind_t hashtable[NHASH];
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/*
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* Initialize the symbol table. All indices should be noticeably invalid.
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*/
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init_symboltable()
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{
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register ind_t *rap;
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for (rap = hashtable; rap < &hashtable[NHASH]; rap++)
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*rap = BADOFF;
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}
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/*
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* Search for `string' in the symboltable. The hash value of `string' is in
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* `hashval'. The linked list belonging to the entry of hashval
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* in the hash table is followed. If the names match, a pointer to the outname
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* in this element of the list is returned. When a match cannot be found,
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* NIL is returned.
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*/
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struct outname *
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searchname(string, hashval)
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char *string;
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int hashval;
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{
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register char *rcp;
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register char *namestring;
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register ind_t symindex;
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register struct outname *name;
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register struct symbol *sym;
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symindex = hashtable[hashval];
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debug("looking for %s %d %ld:", string, hashval, hashtable[hashval], 0);
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while (symindex != BADOFF) {
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sym = (struct symbol *)address(ALLOSYMB, symindex);
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name = (struct outname *)address(ALLOGLOB, sym->sy_name);
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namestring = address(ALLOGCHR, (ind_t)name->on_foff);
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rcp = string;
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debug("comp %s;", namestring, 0, 0, 0);
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while (*rcp == *namestring++)
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if (*rcp++ == '\0') {
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debug("found %x, %x, %lx\n",
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name->on_type, name->on_desc, name->on_valu, 0);
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return name;
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}
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symindex = sym->sy_next;
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}
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/* Not found. */
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debug("not found\n", 0, 0, 0, 0);
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return (struct outname *)0;
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}
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/*
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* Enter a new name in the symbol table. We must copy everything to a
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* new entry. `Name' is a private copy, i.e. the pointer to it will not be
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* destroyed by allocation. However, the string of which name->on_foff is the
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* offset can be destroyed, so we save it first.
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*/
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entername(name, hashval)
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struct outname *name;
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int hashval;
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{
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ind_t savindex;
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ind_t symindex;
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ind_t namindex;
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register struct symbol *sym;
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struct outname *newname;
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extern ind_t savechar();
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extern ind_t hard_alloc();
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debug("entername %s %d %x %x", modulptr((ind_t)name->on_foff), hashval, name->on_type, name->on_desc);
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savindex = savechar(ALLOGCHR, (ind_t)name->on_foff);
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symindex = hard_alloc(ALLOSYMB, (long)sizeof(struct symbol));
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debug("; %ld\n", symindex, 0, 0, 0);
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namindex = hard_alloc(ALLOGLOB, (long)sizeof(struct outname));
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if (savindex == BADOFF || symindex == BADOFF || namindex == BADOFF)
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fatal("symbol table overflow");
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sym = (struct symbol *)address(ALLOSYMB, symindex);
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sym->sy_name = namindex;
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newname = (struct outname *)address(ALLOGLOB, namindex);
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*newname = *name;
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newname->on_foff = savindex;
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sym->sy_next = hashtable[hashval];
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hashtable[hashval] = symindex;
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}
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/*
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* Return the index of `name' in the symbol table in the order in which
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* it was entered. We need a REAL index, not a byte offset.
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*/
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unsigned
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indexof(name)
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struct outname *name;
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{
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return name - (struct outname *)address(ALLOGLOB, (ind_t)0);
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}
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/*
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* Assign an integer to the string in p.
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* 0 <= hash(p) < NHASH, so it can - and will - be used
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* as index in a hash table.
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*/
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int
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hash(p)
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register char *p;
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{
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register unsigned short h = 0;
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register int c;
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while (c = *p++) {
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h <<= 2;
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h += c;
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}
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return h % NHASH;
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}
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