671 lines
18 KiB
C
671 lines
18 KiB
C
#include <assert.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include "lburg.h"
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static char rcsid[] = "lburg.c - faked rcsid";
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static char *prefix = "";
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static int Tflag = 0;
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static int ntnumber = 0;
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static Nonterm start = 0;
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static Term terms;
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static Nonterm nts;
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static Rule rules;
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static int nrules;
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static struct block {
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struct block *link;
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} *memlist; /* list of allocated blocks */
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static char *stringf(char *fmt, ...);
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static void print(char *fmt, ...);
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static void ckreach(Nonterm p);
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static void emitclosure(Nonterm nts);
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static void emitcost(Tree t, char *v);
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static void emitdefs(Nonterm nts, int ntnumber);
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static void emitheader(void);
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static void emitkids(Rule rules, int nrules);
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static void emitnts(Rule rules, int nrules);
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static void emitrecalc(char *pre, Term root, Term kid);
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static void emitrecord(char *pre, Rule r, char *c, int cost);
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static void emitrule(Nonterm nts);
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static void emitlabel(Term terms, Nonterm start, int ntnumber);
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static void emitstring(Rule rules);
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static void emitstruct(Nonterm nts, int ntnumber);
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static void emittest(Tree t, char *v, char *suffix);
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int main(int argc, char *argv[]) {
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int c, i;
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Nonterm p;
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for (i = 1; i < argc; i++)
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if (strcmp(argv[i], "-T") == 0)
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Tflag = 1;
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else if (strncmp(argv[i], "-p", 2) == 0 && argv[i][2])
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prefix = &argv[i][2];
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else if (strncmp(argv[i], "-p", 2) == 0 && i + 1 < argc)
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prefix = argv[++i];
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else if (*argv[i] == '-' && argv[i][1]) {
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yyerror("usage: %s [-T | -p prefix]... [ [ input ] output ] \n",
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argv[0]);
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exit(1);
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} else if (infp == NULL) {
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if (strcmp(argv[i], "-") == 0)
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infp = stdin;
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else if ((infp = fopen(argv[i], "r")) == NULL) {
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yyerror("%s: can't read `%s'\n", argv[0], argv[i]);
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exit(1);
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}
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} else if (outfp == NULL) {
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if (strcmp(argv[i], "-") == 0)
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outfp = stdout;
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if ((outfp = fopen(argv[i], "w")) == NULL) {
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yyerror("%s: can't write `%s'\n", argv[0], argv[i]);
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exit(1);
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}
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}
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if (infp == NULL)
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infp = stdin;
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if (outfp == NULL)
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outfp = stdout;
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yyparse();
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if (start)
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ckreach(start);
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for (p = nts; p; p = p->link) {
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if (p->rules == NULL)
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yyerror("undefined nonterminal `%s'\n", p->name);
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if (!p->reached)
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yyerror("can't reach nonterminal `%s'\n", p->name);
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}
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emitheader();
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emitdefs(nts, ntnumber);
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emitstruct(nts, ntnumber);
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emitnts(rules, nrules);
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emitstring(rules);
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emitrule(nts);
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emitclosure(nts);
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if (start)
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emitlabel(terms, start, ntnumber);
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emitkids(rules, nrules);
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if (!feof(infp))
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while ((c = getc(infp)) != EOF)
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putc(c, outfp);
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while (memlist) { /* for purify */
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struct block *q = memlist->link;
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free(memlist);
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memlist = q;
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}
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return errcnt > 0;
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}
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/* alloc - allocate nbytes or issue fatal error */
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void *alloc(int nbytes) {
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struct block *p = calloc(1, sizeof *p + nbytes);
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if (p == NULL) {
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yyerror("out of memory\n");
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exit(1);
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}
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p->link = memlist;
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memlist = p;
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return p + 1;
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}
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/* stringf - format and save a string */
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static char *stringf(char *fmt, ...) {
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va_list ap;
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char buf[512];
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va_start(ap, fmt);
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vsprintf(buf, fmt, ap);
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va_end(ap);
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return strcpy(alloc(strlen(buf) + 1), buf);
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}
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struct entry {
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union {
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char *name;
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struct term t;
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struct nonterm nt;
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} sym;
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struct entry *link;
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} *table[211];
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#define HASHSIZE (sizeof table/sizeof table[0])
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/* hash - return hash number for str */
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static unsigned hash(char *str) {
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unsigned h = 0;
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while (*str)
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h = (h<<1) + *str++;
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return h;
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}
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/* lookup - lookup symbol name */
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static void *lookup(char *name) {
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struct entry *p = table[hash(name)%HASHSIZE];
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for ( ; p; p = p->link)
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if (strcmp(name, p->sym.name) == 0)
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return &p->sym;
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return 0;
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}
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/* install - install symbol name */
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static void *install(char *name) {
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struct entry *p = alloc(sizeof *p);
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int i = hash(name)%HASHSIZE;
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p->sym.name = name;
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p->link = table[i];
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table[i] = p;
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return &p->sym;
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}
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/* nonterm - create a new terminal id, if necessary */
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Nonterm nonterm(char *id) {
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Nonterm p = lookup(id), *q = &nts;
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if (p && p->kind == NONTERM)
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return p;
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if (p && p->kind == TERM)
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yyerror("`%s' is a terminal\n", id);
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p = install(id);
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p->kind = NONTERM;
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p->number = ++ntnumber;
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if (p->number == 1)
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start = p;
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while (*q && (*q)->number < p->number)
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q = &(*q)->link;
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assert(*q == 0 || (*q)->number != p->number);
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p->link = *q;
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*q = p;
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return p;
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}
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/* term - create a new terminal id with external symbol number esn */
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Term term(char *id, int esn) {
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Term p = lookup(id), *q = &terms;
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if (p)
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yyerror("redefinition of terminal `%s'\n", id);
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else
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p = install(id);
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p->kind = TERM;
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p->esn = esn;
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p->arity = -1;
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while (*q && (*q)->esn < p->esn)
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q = &(*q)->link;
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if (*q && (*q)->esn == p->esn)
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yyerror("duplicate external symbol number `%s=%d'\n",
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p->name, p->esn);
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p->link = *q;
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*q = p;
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return p;
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}
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/* tree - create & initialize a tree node with the given fields */
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Tree tree(char *id, Tree left, Tree right) {
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Tree t = alloc(sizeof *t);
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Term p = lookup(id);
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int arity = 0;
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if (left && right)
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arity = 2;
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else if (left)
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arity = 1;
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if (p == NULL && arity > 0) {
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yyerror("undefined terminal `%s'\n", id);
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p = term(id, -1);
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} else if (p == NULL && arity == 0)
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p = (Term)nonterm(id);
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else if (p && p->kind == NONTERM && arity > 0) {
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yyerror("`%s' is a nonterminal\n", id);
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p = term(id, -1);
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}
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if (p->kind == TERM && p->arity == -1)
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p->arity = arity;
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if (p->kind == TERM && arity != p->arity)
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yyerror("inconsistent arity for terminal `%s'\n", id);
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t->op = p;
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t->nterms = p->kind == TERM;
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if ((t->left = left) != NULL)
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t->nterms += left->nterms;
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if ((t->right = right) != NULL)
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t->nterms += right->nterms;
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return t;
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}
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/* rule - create & initialize a rule with the given fields */
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Rule rule(char *id, Tree pattern, char *template, char *code) {
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Rule r = alloc(sizeof *r), *q;
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Term p = pattern->op;
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char *end;
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r->lhs = nonterm(id);
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r->packed = ++r->lhs->lhscount;
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for (q = &r->lhs->rules; *q; q = &(*q)->decode)
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;
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*q = r;
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r->pattern = pattern;
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r->ern = ++nrules;
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r->template = template;
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r->code = code;
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r->cost = strtol(code, &end, 10);
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if (*end) {
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r->cost = -1;
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r->code = stringf("(%s)", code);
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}
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if (p->kind == TERM) {
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for (q = &p->rules; *q; q = &(*q)->next)
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;
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*q = r;
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} else if (pattern->left == NULL && pattern->right == NULL) {
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Nonterm p = pattern->op;
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r->chain = p->chain;
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p->chain = r;
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if (r->cost == -1)
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yyerror("illegal nonconstant cost `%s'\n", code);
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}
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for (q = &rules; *q; q = &(*q)->link)
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;
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r->link = *q;
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*q = r;
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return r;
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}
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/* print - formatted output */
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static void print(char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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for ( ; *fmt; fmt++)
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if (*fmt == '%')
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switch (*++fmt) {
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case 'd': fprintf(outfp, "%d", va_arg(ap, int)); break;
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case 's': fputs(va_arg(ap, char *), outfp); break;
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case 'P': fprintf(outfp, "%s_", prefix); break;
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case 'T': {
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Tree t = va_arg(ap, Tree);
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print("%S", t->op);
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if (t->left && t->right)
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print("(%T,%T)", t->left, t->right);
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else if (t->left)
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print("(%T)", t->left);
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break;
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}
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case 'R': {
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Rule r = va_arg(ap, Rule);
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print("%S: %T", r->lhs, r->pattern);
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break;
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}
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case 'S': fputs(va_arg(ap, Term)->name, outfp); break;
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case '1': case '2': case '3': case '4': case '5': {
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int n = *fmt - '0';
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while (n-- > 0)
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putc('\t', outfp);
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break;
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}
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default: putc(*fmt, outfp); break;
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}
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else
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putc(*fmt, outfp);
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va_end(ap);
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}
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/* reach - mark all nonterminals in tree t as reachable */
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static void reach(Tree t) {
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Nonterm p = t->op;
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if (p->kind == NONTERM)
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if (!p->reached)
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ckreach(p);
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if (t->left)
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reach(t->left);
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if (t->right)
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reach(t->right);
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}
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/* ckreach - mark all nonterminals reachable from p */
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static void ckreach(Nonterm p) {
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Rule r;
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p->reached = 1;
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for (r = p->rules; r; r = r->decode)
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reach(r->pattern);
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}
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/* emitcase - emit one case in function state */
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static void emitcase(Term p, int ntnumber) {
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Rule r;
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print("%1case %d: /* %S */\n", p->esn, p);
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switch (p->arity) {
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case 0: case -1:
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break;
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case 1:
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print("%2%Plabel(LEFT_CHILD(a));\n");
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break;
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case 2:
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print("%2%Plabel(LEFT_CHILD(a));\n");
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print("%2%Plabel(RIGHT_CHILD(a));\n");
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break;
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default: assert(0);
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}
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for (r = p->rules; r; r = r->next) {
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char *indent = "\t\t\0";
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switch (p->arity) {
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case 0: case -1:
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print("%2/* %R */\n", r);
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if (r->cost == -1) {
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print("%2c = %s;\n", r->code);
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emitrecord("\t\t", r, "c", 0);
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} else
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emitrecord("\t\t", r, r->code, 0);
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break;
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case 1:
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if (r->pattern->nterms > 1) {
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print("%2if (%1/* %R */\n", r);
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emittest(r->pattern->left, "LEFT_CHILD(a)", " ");
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print("%2) {\n");
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indent = "\t\t\t";
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} else
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print("%2/* %R */\n", r);
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if (r->pattern->nterms == 2 && r->pattern->left
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&& r->pattern->right == NULL)
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emitrecalc(indent, r->pattern->op, r->pattern->left->op);
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print("%sc = ", indent);
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emitcost(r->pattern->left, "LEFT_CHILD(a)");
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print("%s;\n", r->code);
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emitrecord(indent, r, "c", 0);
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if (indent[2])
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print("%2}\n");
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break;
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case 2:
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if (r->pattern->nterms > 1) {
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print("%2if (%1/* %R */\n", r);
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emittest(r->pattern->left, "LEFT_CHILD(a)",
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r->pattern->right->nterms ? " && " : " ");
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emittest(r->pattern->right, "RIGHT_CHILD(a)", " ");
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print("%2) {\n");
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indent = "\t\t\t";
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} else
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print("%2/* %R */\n", r);
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print("%sc = ", indent);
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emitcost(r->pattern->left, "LEFT_CHILD(a)");
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emitcost(r->pattern->right, "RIGHT_CHILD(a)");
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print("%s;\n", r->code);
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emitrecord(indent, r, "c", 0);
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if (indent[2])
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print("%2}\n");
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break;
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default: assert(0);
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}
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}
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print("%2break;\n");
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}
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/* emitclosure - emit the closure functions */
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static void emitclosure(Nonterm nts) {
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Nonterm p;
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for (p = nts; p; p = p->link)
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if (p->chain)
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print("static void %Pclosure_%S(NODEPTR_TYPE, int);\n", p);
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print("\n");
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for (p = nts; p; p = p->link)
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if (p->chain) {
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Rule r;
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print("static void %Pclosure_%S(NODEPTR_TYPE a, int c) {\n"
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"%1struct %Pstate *p = STATE_LABEL(a);\n", p);
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for (r = p->chain; r; r = r->chain)
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emitrecord("\t", r, "c", r->cost);
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print("}\n\n");
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}
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}
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/* emitcost - emit cost computation for tree t */
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static void emitcost(Tree t, char *v) {
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Nonterm p = t->op;
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if (p->kind == TERM) {
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if (t->left)
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emitcost(t->left, stringf("LEFT_CHILD(%s)", v));
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if (t->right)
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emitcost(t->right, stringf("RIGHT_CHILD(%s)", v));
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} else
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print("((struct %Pstate *)(%s->x.state))->cost[%P%S_NT] + ", v, p);
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}
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/* emitdefs - emit nonterminal defines and data structures */
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static void emitdefs(Nonterm nts, int ntnumber) {
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Nonterm p;
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for (p = nts; p; p = p->link)
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print("#define %P%S_NT %d\n", p, p->number);
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print("\n");
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print("static char *%Pntname[] = {\n%10,\n");
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for (p = nts; p; p = p->link)
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print("%1\"%S\",\n", p);
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print("%10\n};\n\n");
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}
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/* emitheader - emit initial definitions */
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static void emitheader(void) {
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time_t timer = time(NULL);
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print("/*\ngenerated at %sby %s\n*/\n", ctime(&timer), rcsid);
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print("static void %Pkids(NODEPTR_TYPE, int, NODEPTR_TYPE[]);\n");
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print("static void %Plabel(NODEPTR_TYPE);\n");
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print("static int %Prule(void*, int);\n\n");
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}
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/* computekids - compute paths to kids in tree t */
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static char *computekids(Tree t, char *v, char *bp, int *ip) {
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Term p = t->op;
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if (p->kind == NONTERM) {
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sprintf(bp, "\t\tkids[%d] = %s;\n", (*ip)++, v);
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bp += strlen(bp);
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} else if (p->arity > 0) {
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bp = computekids(t->left, stringf("LEFT_CHILD(%s)", v), bp, ip);
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if (p->arity == 2)
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bp = computekids(t->right, stringf("RIGHT_CHILD(%s)", v), bp, ip);
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}
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return bp;
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}
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/* emitkids - emit _kids */
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static void emitkids(Rule rules, int nrules) {
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int i;
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Rule r, *rc = alloc((nrules + 1 + 1)*sizeof *rc);
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char **str = alloc((nrules + 1 + 1)*sizeof *str);
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for (i = 0, r = rules; r; r = r->link) {
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int j = 0;
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char buf[1024], *bp = buf;
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*computekids(r->pattern, "p", bp, &j) = 0;
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for (j = 0; str[j] && strcmp(str[j], buf); j++)
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;
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if (str[j] == NULL)
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str[j] = strcpy(alloc(strlen(buf) + 1), buf);
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r->kids = rc[j];
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rc[j] = r;
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}
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print("static void %Pkids(NODEPTR_TYPE p, int eruleno, NODEPTR_TYPE kids[]) {\n"
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"%1if (!p)\n%2fatal(\"%Pkids\", \"Null tree\\n\", 0);\n"
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"%1if (!kids)\n%2fatal(\"%Pkids\", \"Null kids\\n\", 0);\n"
|
|
"%1switch (eruleno) {\n");
|
|
for (i = 0; (r = rc[i]) != NULL; i++) {
|
|
for ( ; r; r = r->kids)
|
|
print("%1case %d: /* %R */\n", r->ern, r);
|
|
print("%s%2break;\n", str[i]);
|
|
}
|
|
print("%1default:\n%2fatal(\"%Pkids\", \"Bad rule number %%d\\n\", eruleno);\n%1}\n}\n\n");
|
|
}
|
|
|
|
/* emitlabel - emit label function */
|
|
static void emitlabel(Term terms, Nonterm start, int ntnumber) {
|
|
int i;
|
|
Term p;
|
|
|
|
print("static void %Plabel(NODEPTR_TYPE a) {\n%1int c;\n"
|
|
"%1struct %Pstate *p;\n\n"
|
|
"%1if (!a)\n%2fatal(\"%Plabel\", \"Null tree\\n\", 0);\n");
|
|
print("%1STATE_LABEL(a) = p = allocate(sizeof *p, FUNC);\n"
|
|
"%1p->rule._stmt = 0;\n");
|
|
for (i = 1; i <= ntnumber; i++)
|
|
print("%1p->cost[%d] =\n", i);
|
|
print("%20x7fff;\n%1switch (OP_LABEL(a)) {\n");
|
|
for (p = terms; p; p = p->link)
|
|
emitcase(p, ntnumber);
|
|
print("%1default:\n"
|
|
"%2fatal(\"%Plabel\", \"Bad terminal %%d\\n\", OP_LABEL(a));\n%1}\n}\n\n");
|
|
}
|
|
|
|
/* computents - fill in bp with _nts vector for tree t */
|
|
static char *computents(Tree t, char *bp) {
|
|
if (t) {
|
|
Nonterm p = t->op;
|
|
if (p->kind == NONTERM) {
|
|
sprintf(bp, "%s_%s_NT, ", prefix, p->name);
|
|
bp += strlen(bp);
|
|
} else
|
|
bp = computents(t->right, computents(t->left, bp));
|
|
}
|
|
return bp;
|
|
}
|
|
|
|
/* emitnts - emit _nts ragged array */
|
|
static void emitnts(Rule rules, int nrules) {
|
|
Rule r;
|
|
int i, j, *nts = alloc((nrules + 1)*sizeof *nts);
|
|
char **str = alloc((nrules + 1)*sizeof *str);
|
|
|
|
for (i = 0, r = rules; r; r = r->link) {
|
|
char buf[1024];
|
|
*computents(r->pattern, buf) = 0;
|
|
for (j = 0; str[j] && strcmp(str[j], buf); j++)
|
|
;
|
|
if (str[j] == NULL) {
|
|
print("static short %Pnts_%d[] = { %s0 };\n", j, buf);
|
|
str[j] = strcpy(alloc(strlen(buf) + 1), buf);
|
|
}
|
|
nts[i++] = j;
|
|
}
|
|
print("\nstatic short *%Pnts[] = {\n");
|
|
for (i = j = 0, r = rules; r; r = r->link) {
|
|
for ( ; j < r->ern; j++)
|
|
print("%10,%1/* %d */\n", j);
|
|
print("%1%Pnts_%d,%1/* %d */\n", nts[i++], j++);
|
|
}
|
|
print("};\n\n");
|
|
}
|
|
|
|
/* emitrecalc - emit code that tests for recalculation of INDIR?(VREGP) */
|
|
static void emitrecalc(char *pre, Term root, Term kid) {
|
|
if (root->kind == TERM && strncmp(root->name, "INDIR", 5) == 0
|
|
&& kid->kind == TERM && strcmp(kid->name, "VREGP" ) == 0) {
|
|
Nonterm p;
|
|
print("%sif (mayrecalc(a)) {\n", pre);
|
|
print("%s%1struct %Pstate *q = a->syms[RX]->u.t.cse->x.state;\n", pre);
|
|
for (p = nts; p; p = p->link) {
|
|
print("%s%1if (q->cost[%P%S_NT] == 0) {\n", pre, p);
|
|
print("%s%2p->cost[%P%S_NT] = 0;\n", pre, p);
|
|
print("%s%2p->rule.%P%S = q->rule.%P%S;\n", pre, p, p);
|
|
print("%s%1}\n", pre);
|
|
}
|
|
print("%s}\n", pre);
|
|
}
|
|
}
|
|
|
|
/* emitrecord - emit code that tests for a winning match of rule r */
|
|
static void emitrecord(char *pre, Rule r, char *c, int cost) {
|
|
if (Tflag)
|
|
print("%s%Ptrace(a, %d, %s + %d, p->cost[%P%S_NT]);\n",
|
|
pre, r->ern, c, cost, r->lhs);
|
|
print("%sif (", pre);
|
|
print("%s + %d < p->cost[%P%S_NT]) {\n"
|
|
"%s%1p->cost[%P%S_NT] = %s + %d;\n%s%1p->rule.%P%S = %d;\n",
|
|
c, cost, r->lhs, pre, r->lhs, c, cost, pre, r->lhs,
|
|
r->packed);
|
|
if (r->lhs->chain)
|
|
print("%s%1%Pclosure_%S(a, %s + %d);\n", pre, r->lhs, c, cost);
|
|
print("%s}\n", pre);
|
|
}
|
|
|
|
/* emitrule - emit decoding vectors and _rule */
|
|
static void emitrule(Nonterm nts) {
|
|
Nonterm p;
|
|
|
|
for (p = nts; p; p = p->link) {
|
|
Rule r;
|
|
print("static short %Pdecode_%S[] = {\n%10,\n", p);
|
|
for (r = p->rules; r; r = r->decode)
|
|
print("%1%d,\n", r->ern);
|
|
print("};\n\n");
|
|
}
|
|
print("static int %Prule(void *state, int goalnt) {\n"
|
|
"%1if (goalnt < 1 || goalnt > %d)\n%2fatal(\"%Prule\", \"Bad goal nonterminal %%d\\n\", goalnt);\n"
|
|
"%1if (!state)\n%2return 0;\n%1switch (goalnt) {\n", ntnumber);
|
|
for (p = nts; p; p = p->link)
|
|
print("%1case %P%S_NT:"
|
|
"%1return %Pdecode_%S[((struct %Pstate *)state)->rule.%P%S];\n", p, p, p);
|
|
print("%1default:\n%2fatal(\"%Prule\", \"Bad goal nonterminal %%d\\n\", goalnt);\n%2return 0;\n%1}\n}\n\n");
|
|
}
|
|
|
|
/* emitstring - emit arrays of templates, instruction flags, and rules */
|
|
static void emitstring(Rule rules) {
|
|
Rule r;
|
|
|
|
print("static char *%Ptemplates[] = {\n");
|
|
print("/* 0 */%10,\n");
|
|
for (r = rules; r; r = r->link)
|
|
print("/* %d */%1\"%s\",%1/* %R */\n", r->ern, r->template, r);
|
|
print("};\n");
|
|
print("\nstatic char %Pisinstruction[] = {\n");
|
|
print("/* 0 */%10,\n");
|
|
for (r = rules; r; r = r->link) {
|
|
int len = strlen(r->template);
|
|
print("/* %d */%1%d,%1/* %s */\n", r->ern,
|
|
len >= 2 && r->template[len-2] == '\\' && r->template[len-1] == 'n',
|
|
r->template);
|
|
}
|
|
print("};\n");
|
|
print("\nstatic char *%Pstring[] = {\n");
|
|
print("/* 0 */%10,\n");
|
|
for (r = rules; r; r = r->link)
|
|
print("/* %d */%1\"%R\",\n", r->ern, r);
|
|
print("};\n\n");
|
|
}
|
|
|
|
/* emitstruct - emit the definition of the state structure */
|
|
static void emitstruct(Nonterm nts, int ntnumber) {
|
|
print("struct %Pstate {\n%1short cost[%d];\n%1struct {\n", ntnumber + 1);
|
|
for ( ; nts; nts = nts->link) {
|
|
int n = 1, m = nts->lhscount;
|
|
while ((m >>= 1) != 0)
|
|
n++;
|
|
print("%2unsigned int %P%S:%d;\n", nts, n);
|
|
}
|
|
print("%1} rule;\n};\n\n");
|
|
}
|
|
|
|
/* emittest - emit clause for testing a match */
|
|
static void emittest(Tree t, char *v, char *suffix) {
|
|
Term p = t->op;
|
|
|
|
if (p->kind == TERM) {
|
|
print("%3%s->op == %d%s/* %S */\n", v, p->esn,
|
|
t->nterms > 1 ? " && " : suffix, p);
|
|
if (t->left)
|
|
emittest(t->left, stringf("LEFT_CHILD(%s)", v),
|
|
t->right && t->right->nterms ? " && " : suffix);
|
|
if (t->right)
|
|
emittest(t->right, stringf("RIGHT_CHILD(%s)", v), suffix);
|
|
}
|
|
}
|