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-rw-r--r--mcs/jay/reader.c1627
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diff --git a/mcs/jay/reader.c b/mcs/jay/reader.c
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-/*
- * Copyright (c) 1989 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Robert Paul Corbett.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifndef lint
-static char sccsid[] = "@(#)reader.c 5.7 (Berkeley) 1/20/91";
-#endif /* not lint */
-
-#include "defs.h"
-
-/* The line size must be a positive integer. One hundred was chosen */
-/* because few lines in Yacc input grammars exceed 100 characters. */
-/* Note that if a line exceeds LINESIZE characters, the line buffer */
-/* will be expanded to accomodate it. */
-
-#define LINESIZE 100
-
-char *cache;
-int cinc, cache_size;
-
-int ntags, tagmax;
-char **tag_table;
-
-char saw_eof;
-char *cptr, *line;
-int linesize;
-
-bucket *goal;
-int prec;
-int gensym;
-char last_was_action;
-
-int maxitems;
-bucket **pitem;
-
-int maxrules;
-bucket **plhs;
-
-int name_pool_size;
-char *name_pool;
-
-char *line_format = "\t\t\t\t\t// line %d \"%s\"\n";
-
-
-cachec(c)
-int c;
-{
- assert(cinc >= 0);
- if (cinc >= cache_size)
- {
- cache_size += 256;
- cache = REALLOC(cache, cache_size);
- if (cache == 0) no_space();
- }
- cache[cinc] = c;
- ++cinc;
-}
-
-
-get_line()
-{
- register FILE *f = input_file;
- register int c;
- register int i;
-
- if (saw_eof || (c = getc(f)) == EOF)
- {
- if (line) { FREE(line); line = 0; }
- cptr = 0;
- saw_eof = 1;
- return;
- }
-
- if (line == 0 || linesize != (LINESIZE + 1))
- {
- if (line) FREE(line);
- linesize = LINESIZE + 1;
- line = MALLOC(linesize);
- if (line == 0) no_space();
- }
-
- i = 0;
- ++lineno;
- for (;;)
- {
- line[i] = c;
- if (c == '\n') { cptr = line; return; }
- if (++i >= linesize)
- {
- linesize += LINESIZE;
- line = REALLOC(line, linesize);
- if (line == 0) no_space();
- }
- c = getc(f);
- if (c == EOF)
- {
- line[i] = '\n';
- saw_eof = 1;
- cptr = line;
- return;
- }
- }
-}
-
-
-char *
-dup_line()
-{
- register char *p, *s, *t;
-
- if (line == 0) return (0);
- s = line;
- while (*s != '\n') ++s;
- p = MALLOC(s - line + 1);
- if (p == 0) no_space();
-
- s = line;
- t = p;
- while ((*t++ = *s++) != '\n') continue;
- return (p);
-}
-
-
-skip_comment()
-{
- register char *s;
-
- int st_lineno = lineno;
- char *st_line = dup_line();
- char *st_cptr = st_line + (cptr - line);
-
- s = cptr + 2;
- for (;;)
- {
- if (*s == '*' && s[1] == '/')
- {
- cptr = s + 2;
- FREE(st_line);
- return;
- }
- if (*s == '\n')
- {
- get_line();
- if (line == 0)
- unterminated_comment(st_lineno, st_line, st_cptr);
- s = cptr;
- }
- else
- ++s;
- }
-}
-
-
-int
-nextc()
-{
- register char *s;
-
- if (line == 0)
- {
- get_line();
- if (line == 0)
- return (EOF);
- }
-
- s = cptr;
- for (;;)
- {
- switch (*s)
- {
- case '\n':
- get_line();
- if (line == 0) return (EOF);
- s = cptr;
- break;
-
- case ' ':
- case '\t':
- case '\f':
- case '\r':
- case '\v':
- case ',':
- case ';':
- ++s;
- break;
-
- case '\\':
- cptr = s;
- return ('%');
-
- case '/':
- if (s[1] == '*')
- {
- cptr = s;
- skip_comment();
- s = cptr;
- break;
- }
- else if (s[1] == '/')
- {
- get_line();
- if (line == 0) return (EOF);
- s = cptr;
- break;
- }
- /* fall through */
-
- default:
- cptr = s;
- return (*s);
- }
- }
-}
-
-
-int
-keyword()
-{
- register int c;
- char *t_cptr = cptr;
-
- c = *++cptr;
- if (isalpha(c))
- {
- cinc = 0;
- for (;;)
- {
- if (isalpha(c))
- {
- if (isupper(c)) c = tolower(c);
- cachec(c);
- }
- else if (isdigit(c) || c == '_' || c == '.' || c == '$')
- cachec(c);
- else
- break;
- c = *++cptr;
- }
- cachec(NUL);
-
- if (strcmp(cache, "token") == 0 || strcmp(cache, "term") == 0)
- return (TOKEN);
- if (strcmp(cache, "type") == 0)
- return (TYPE);
- if (strcmp(cache, "left") == 0)
- return (LEFT);
- if (strcmp(cache, "right") == 0)
- return (RIGHT);
- if (strcmp(cache, "nonassoc") == 0 || strcmp(cache, "binary") == 0)
- return (NONASSOC);
- if (strcmp(cache, "start") == 0)
- return (START);
- }
- else
- {
- ++cptr;
- if (c == '{')
- return (TEXT);
- if (c == '%' || c == '\\')
- return (MARK);
- if (c == '<')
- return (LEFT);
- if (c == '>')
- return (RIGHT);
- if (c == '0')
- return (TOKEN);
- if (c == '2')
- return (NONASSOC);
- }
- syntax_error(lineno, line, t_cptr);
- /*NOTREACHED*/
-}
-
-
-copy_text(f)
-FILE *f;
-{
- register int c;
- int quote;
- int need_newline = 0;
- int t_lineno = lineno;
- char *t_line = dup_line();
- char *t_cptr = t_line + (cptr - line - 2);
-
- if (*cptr == '\n')
- {
- get_line();
- if (line == 0)
- unterminated_text(t_lineno, t_line, t_cptr);
- }
- fprintf(f, line_format, lineno, input_file_name);
-
-loop:
- c = *cptr++;
- switch (c)
- {
- case '\n':
- next_line:
- putc('\n', f);
- need_newline = 0;
- get_line();
- if (line) goto loop;
- unterminated_text(t_lineno, t_line, t_cptr);
-
- case '\'':
- case '"':
- {
- int s_lineno = lineno;
- char *s_line = dup_line();
- char *s_cptr = s_line + (cptr - line - 1);
-
- quote = c;
- putc(c, f);
- for (;;)
- {
- c = *cptr++;
- putc(c, f);
- if (c == quote)
- {
- need_newline = 1;
- FREE(s_line);
- goto loop;
- }
- if (c == '\n')
- unterminated_string(s_lineno, s_line, s_cptr);
- if (c == '\\')
- {
- c = *cptr++;
- putc(c, f);
- if (c == '\n')
- {
- get_line();
- if (line == 0)
- unterminated_string(s_lineno, s_line, s_cptr);
- }
- }
- }
- }
-
- case '/':
- putc(c, f);
- need_newline = 1;
- c = *cptr;
- if (c == '/')
- {
- do putc(c, f); while ((c = *++cptr) != '\n');
- goto next_line;
- }
- if (c == '*')
- {
- int c_lineno = lineno;
- char *c_line = dup_line();
- char *c_cptr = c_line + (cptr - line - 1);
-
- putc('*', f);
- ++cptr;
- for (;;)
- {
- c = *cptr++;
- putc(c, f);
- if (c == '*' && *cptr == '/')
- {
- putc('/', f);
- ++cptr;
- FREE(c_line);
- goto loop;
- }
- if (c == '\n')
- {
- get_line();
- if (line == 0)
- unterminated_comment(c_lineno, c_line, c_cptr);
- }
- }
- }
- need_newline = 1;
- goto loop;
-
- case '%':
- case '\\':
- if (*cptr == '}')
- {
- if (need_newline) putc('\n', f);
- ++cptr;
- FREE(t_line);
- return;
- }
- /* fall through */
-
- default:
- putc(c, f);
- need_newline = 1;
- goto loop;
- }
-}
-
-int
-hexval(c)
-int c;
-{
- if (c >= '0' && c <= '9')
- return (c - '0');
- if (c >= 'A' && c <= 'F')
- return (c - 'A' + 10);
- if (c >= 'a' && c <= 'f')
- return (c - 'a' + 10);
- return (-1);
-}
-
-
-bucket *
-get_literal()
-{
- register int c, quote;
- register int i;
- register int n;
- register char *s;
- register bucket *bp;
- int s_lineno = lineno;
- char *s_line = dup_line();
- char *s_cptr = s_line + (cptr - line);
-
- quote = *cptr++;
- cinc = 0;
- for (;;)
- {
- c = *cptr++;
- if (c == quote) break;
- if (c == '\n') unterminated_string(s_lineno, s_line, s_cptr);
- if (c == '\\')
- {
- char *c_cptr = cptr - 1;
-
- c = *cptr++;
- switch (c)
- {
- case '\n':
- get_line();
- if (line == 0) unterminated_string(s_lineno, s_line, s_cptr);
- continue;
-
- case '0': case '1': case '2': case '3':
- case '4': case '5': case '6': case '7':
- n = c - '0';
- c = *cptr;
- if (IS_OCTAL(c))
- {
- n = (n << 3) + (c - '0');
- c = *++cptr;
- if (IS_OCTAL(c))
- {
- n = (n << 3) + (c - '0');
- ++cptr;
- }
- }
- if (n > MAXCHAR) illegal_character(c_cptr);
- c = n;
- break;
-
- case 'x':
- c = *cptr++;
- n = hexval(c);
- if (n < 0 || n >= 16)
- illegal_character(c_cptr);
- for (;;)
- {
- c = *cptr;
- i = hexval(c);
- if (i < 0 || i >= 16) break;
- ++cptr;
- n = (n << 4) + i;
- if (n > MAXCHAR) illegal_character(c_cptr);
- }
- c = n;
- break;
-
- case 'a': c = 7; break;
- case 'b': c = '\b'; break;
- case 'f': c = '\f'; break;
- case 'n': c = '\n'; break;
- case 'r': c = '\r'; break;
- case 't': c = '\t'; break;
- case 'v': c = '\v'; break;
- }
- }
- cachec(c);
- }
- FREE(s_line);
-
- n = cinc;
- s = MALLOC(n);
- if (s == 0) no_space();
-
- for (i = 0; i < n; ++i)
- s[i] = cache[i];
-
- cinc = 0;
- if (n == 1)
- cachec('\'');
- else
- cachec('"');
-
- for (i = 0; i < n; ++i)
- {
- c = ((unsigned char *)s)[i];
- if (c == '\\' || c == cache[0])
- {
- cachec('\\');
- cachec(c);
- }
- else if (isprint(c))
- cachec(c);
- else
- {
- cachec('\\');
- switch (c)
- {
- case 7: cachec('a'); break;
- case '\b': cachec('b'); break;
- case '\f': cachec('f'); break;
- case '\n': cachec('n'); break;
- case '\r': cachec('r'); break;
- case '\t': cachec('t'); break;
- case '\v': cachec('v'); break;
- default:
- cachec(((c >> 6) & 7) + '0');
- cachec(((c >> 3) & 7) + '0');
- cachec((c & 7) + '0');
- break;
- }
- }
- }
-
- if (n == 1)
- cachec('\'');
- else
- cachec('"');
-
- cachec(NUL);
- bp = lookup(cache);
- bp->class = TERM;
- if (n == 1 && bp->value == UNDEFINED)
- bp->value = *(unsigned char *)s;
- FREE(s);
-
- return (bp);
-}
-
-
-int
-is_reserved(name)
-char *name;
-{
- char *s;
-
- if (strcmp(name, ".") == 0 ||
- strcmp(name, "$accept") == 0 ||
- strcmp(name, "$end") == 0)
- return (1);
-
- if (name[0] == '$' && name[1] == '$' && isdigit(name[2]))
- {
- s = name + 3;
- while (isdigit(*s)) ++s;
- if (*s == NUL) return (1);
- }
-
- return (0);
-}
-
-
-bucket *
-get_name()
-{
- register int c;
-
- cinc = 0;
- for (c = *cptr; IS_IDENT(c); c = *++cptr)
- cachec(c);
- cachec(NUL);
-
- if (is_reserved(cache)) used_reserved(cache);
-
- return (lookup(cache));
-}
-
-
-int
-get_number()
-{
- register int c;
- register int n;
-
- n = 0;
- for (c = *cptr; isdigit(c); c = *++cptr)
- n = 10*n + (c - '0');
-
- return (n);
-}
-
-
-char *
-get_tag(int emptyOk)
-{
- register int c;
- register int i;
- register char *s;
- int t_lineno = lineno;
- char *t_line = dup_line();
- char *t_cptr = t_line + (cptr - line);
-
- ++cptr;
- c = nextc();
- if (c == EOF) unexpected_EOF();
- if (emptyOk && c == '>') {
- ++cptr; return 0; // 0 indicates empty tag if emptyOk
- }
- if (!isalpha(c) && c != '_' && c != '$')
- illegal_tag(t_lineno, t_line, t_cptr);
-
- cinc = 0;
- do { cachec(c); c = *++cptr; } while (IS_IDENT(c));
- cachec(NUL);
-
- c = nextc();
- if (c == EOF) unexpected_EOF();
- if (c != '>')
- illegal_tag(t_lineno, t_line, t_cptr);
- ++cptr;
-
- for (i = 0; i < ntags; ++i)
- {
- if (strcmp(cache, tag_table[i]) == 0)
- return (tag_table[i]);
- }
-
- if (ntags >= tagmax)
- {
- tagmax += 16;
- tag_table = (char **)
- (tag_table ? REALLOC(tag_table, tagmax*sizeof(char *))
- : MALLOC(tagmax*sizeof(char *)));
- if (tag_table == 0) no_space();
- }
-
- s = MALLOC(cinc);
- if (s == 0) no_space();
- strcpy(s, cache);
- tag_table[ntags] = s;
- ++ntags;
- FREE(t_line);
- return (s);
-}
-
-
-declare_tokens(assoc)
-int assoc;
-{
- register int c;
- register bucket *bp;
- int value;
- char *tag = 0;
-
- if (assoc != TOKEN) ++prec;
-
- c = nextc();
- if (c == EOF) unexpected_EOF();
- if (c == '<')
- {
- tag = get_tag(0);
- c = nextc();
- if (c == EOF) unexpected_EOF();
- }
-
- for (;;)
- {
- if (isalpha(c) || c == '_' || c == '.' || c == '$')
- bp = get_name();
- else if (c == '\'' || c == '"')
- bp = get_literal();
- else
- return;
-
- if (bp == goal) tokenized_start(bp->name);
- bp->class = TERM;
-
- if (tag)
- {
- if (bp->tag && tag != bp->tag)
- retyped_warning(bp->name);
- bp->tag = tag;
- }
-
- if (assoc != TOKEN)
- {
- if (bp->prec && prec != bp->prec)
- reprec_warning(bp->name);
- bp->assoc = assoc;
- bp->prec = prec;
- }
-
- c = nextc();
- if (c == EOF) unexpected_EOF();
- value = UNDEFINED;
- if (isdigit(c))
- {
- value = get_number();
- if (bp->value != UNDEFINED && value != bp->value)
- revalued_warning(bp->name);
- bp->value = value;
- c = nextc();
- if (c == EOF) unexpected_EOF();
- }
- }
-}
-
-
-declare_types()
-{
- register int c;
- register bucket *bp;
- char *tag;
-
- c = nextc();
- if (c == EOF) unexpected_EOF();
- if (c != '<') syntax_error(lineno, line, cptr);
- tag = get_tag(0);
-
- for (;;)
- {
- c = nextc();
- if (isalpha(c) || c == '_' || c == '.' || c == '$')
- bp = get_name();
- else if (c == '\'' || c == '"')
- bp = get_literal();
- else
- return;
-
- if (bp->tag && tag != bp->tag)
- retyped_warning(bp->name);
- bp->tag = tag;
- }
-}
-
-
-declare_start()
-{
- register int c;
- register bucket *bp;
-
- c = nextc();
- if (c == EOF) unexpected_EOF();
- if (!isalpha(c) && c != '_' && c != '.' && c != '$')
- syntax_error(lineno, line, cptr);
- bp = get_name();
- if (bp->class == TERM)
- terminal_start(bp->name);
- if (goal && goal != bp)
- restarted_warning();
- goal = bp;
-}
-
-
-read_declarations()
-{
- register int c, k;
-
- cache_size = 256;
- cache = MALLOC(cache_size);
- if (cache == 0) no_space();
-
- for (;;)
- {
- c = nextc();
- if (c == EOF) unexpected_EOF();
- if (c != '%') syntax_error(lineno, line, cptr);
- switch (k = keyword())
- {
- case MARK:
- return;
-
- case TEXT:
- copy_text(prolog_file);
- break;
-
- case TOKEN:
- case LEFT:
- case RIGHT:
- case NONASSOC:
- declare_tokens(k);
- break;
-
- case TYPE:
- declare_types();
- break;
-
- case START:
- declare_start();
- break;
- }
- }
-}
-
-
-initialize_grammar()
-{
- nitems = 4;
- maxitems = 300;
- pitem = (bucket **) MALLOC(maxitems*sizeof(bucket *));
- if (pitem == 0) no_space();
- pitem[0] = 0;
- pitem[1] = 0;
- pitem[2] = 0;
- pitem[3] = 0;
-
- nrules = 3;
- maxrules = 100;
- plhs = (bucket **) MALLOC(maxrules*sizeof(bucket *));
- if (plhs == 0) no_space();
- plhs[0] = 0;
- plhs[1] = 0;
- plhs[2] = 0;
- rprec = (short *) MALLOC(maxrules*sizeof(short));
- if (rprec == 0) no_space();
- rprec[0] = 0;
- rprec[1] = 0;
- rprec[2] = 0;
- rassoc = (char *) MALLOC(maxrules*sizeof(char));
- if (rassoc == 0) no_space();
- rassoc[0] = TOKEN;
- rassoc[1] = TOKEN;
- rassoc[2] = TOKEN;
-}
-
-
-expand_items()
-{
- maxitems += 300;
- pitem = (bucket **) REALLOC(pitem, maxitems*sizeof(bucket *));
- if (pitem == 0) no_space();
-}
-
-
-expand_rules()
-{
- maxrules += 100;
- plhs = (bucket **) REALLOC(plhs, maxrules*sizeof(bucket *));
- if (plhs == 0) no_space();
- rprec = (short *) REALLOC(rprec, maxrules*sizeof(short));
- if (rprec == 0) no_space();
- rassoc = (char *) REALLOC(rassoc, maxrules*sizeof(char));
- if (rassoc == 0) no_space();
-}
-
-
-advance_to_start()
-{
- register int c;
- register bucket *bp;
- char *s_cptr;
- int s_lineno;
-
- for (;;)
- {
- c = nextc();
- if (c != '%') break;
- s_cptr = cptr;
- switch (keyword())
- {
- case MARK:
- no_grammar();
-
- case TEXT:
- copy_text(local_file);
- break;
-
- case START:
- declare_start();
- break;
-
- default:
- syntax_error(lineno, line, s_cptr);
- }
- }
-
- c = nextc();
- if (!isalpha(c) && c != '_' && c != '.' && c != '_')
- syntax_error(lineno, line, cptr);
- bp = get_name();
- if (goal == 0)
- {
- if (bp->class == TERM)
- terminal_start(bp->name);
- goal = bp;
- }
-
- s_lineno = lineno;
- c = nextc();
- if (c == EOF) unexpected_EOF();
- if (c != ':') syntax_error(lineno, line, cptr);
- start_rule(bp, s_lineno);
- ++cptr;
-}
-
-
-start_rule(bp, s_lineno)
-register bucket *bp;
-int s_lineno;
-{
- if (bp->class == TERM)
- terminal_lhs(s_lineno);
- bp->class = NONTERM;
- if (nrules >= maxrules)
- expand_rules();
- plhs[nrules] = bp;
- rprec[nrules] = UNDEFINED;
- rassoc[nrules] = TOKEN;
-}
-
-
-end_rule()
-{
- register int i;
-
- if (!last_was_action && plhs[nrules]->tag)
- {
- for (i = nitems - 1; pitem[i]; --i) continue;
- if (pitem[i+1] == 0 || pitem[i+1]->tag != plhs[nrules]->tag)
- default_action_warning(); /** if classes don't match exactly **/
- } /** bug: could be superclass... **/
-
- last_was_action = 0;
- if (nitems >= maxitems) expand_items();
- pitem[nitems] = 0;
- ++nitems;
- ++nrules;
-}
-
-
-insert_empty_rule()
-{
- register bucket *bp, **bpp;
-
- assert(cache);
- sprintf(cache, "$$%d", ++gensym);
- bp = make_bucket(cache);
- last_symbol->next = bp;
- last_symbol = bp;
- bp->tag = plhs[nrules]->tag;
- bp->class = NONTERM;
-
- if ((nitems += 2) > maxitems)
- expand_items();
- bpp = pitem + nitems - 1;
- *bpp-- = bp;
- while (bpp[0] = bpp[-1]) --bpp;
-
- if (++nrules >= maxrules)
- expand_rules();
- plhs[nrules] = plhs[nrules-1];
- plhs[nrules-1] = bp;
- rprec[nrules] = rprec[nrules-1];
- rprec[nrules-1] = 0;
- rassoc[nrules] = rassoc[nrules-1];
- rassoc[nrules-1] = TOKEN;
-}
-
-
-add_symbol()
-{
- register int c;
- register bucket *bp;
- int s_lineno = lineno;
-
- c = *cptr;
- if (c == '\'' || c == '"')
- bp = get_literal();
- else
- bp = get_name();
-
- c = nextc();
- if (c == ':')
- {
- end_rule();
- start_rule(bp, s_lineno);
- ++cptr;
- return;
- }
-
- if (last_was_action)
- insert_empty_rule();
- last_was_action = 0;
-
- if (++nitems > maxitems)
- expand_items();
- pitem[nitems-1] = bp;
-}
-
-
-copy_action()
-{
- register int c;
- register int i, n;
- int depth;
- int quote;
- char *tag;
- register FILE *f = action_file;
- int a_lineno = lineno;
- char *a_line = dup_line();
- char *a_cptr = a_line + (cptr - line);
-
- if (last_was_action)
- insert_empty_rule();
- last_was_action = 1;
-
- fprintf(f, "case %d:\n", nrules - 2);
- fprintf(f, line_format, lineno, input_file_name);
- putc(' ', f); putc(' ', f);
- if (*cptr == '=') ++cptr;
-
- n = 0;
- for (i = nitems - 1; pitem[i]; --i) ++n;
-
- depth = 0;
-loop:
- c = *cptr;
- if (c == '$')
- {
- if (cptr[1] == '<')
- {
- int d_lineno = lineno;
- char *d_line = dup_line();
- char *d_cptr = d_line + (cptr - line);
-
- ++cptr;
- tag = get_tag(1);
- c = *cptr;
- if (c == '$')
- { if (tag && strcmp(tag, "Object"))
- fprintf(f, "((%s)yyVal)", tag);
- else fprintf(f, "yyVal");
- ++cptr;
- FREE(d_line);
- goto loop;
- }
- else if (isdigit(c))
- {
- i = get_number();
- if (i > n) dollar_warning(d_lineno, i);
- if (tag && strcmp(tag, "Object"))
- fprintf(f, "((%s)yyVals[%d+yyTop])", tag, i - n);
- else fprintf(f, "yyVals[%d+yyTop]", i - n);
- FREE(d_line);
- goto loop;
- }
- else if (c == '-' && isdigit(cptr[1]))
- {
- ++cptr;
- i = -get_number() - n;
- if (tag && strcmp(tag, "Object"))
- fprintf(f, "((%s)yyVals[%d+yyTop])", tag, i);
- else fprintf(f, "yyVals[%d+yyTop]", tag, i);
- FREE(d_line);
- goto loop;
- }
- else
- dollar_error(d_lineno, d_line, d_cptr);
- }
- else if (cptr[1] == '$')
- {
- if (ntags && plhs[nrules]->tag == 0)
- untyped_lhs();
- fprintf(f, "yyVal");
- cptr += 2;
- goto loop;
- }
- else if (isdigit(cptr[1]))
- {
- ++cptr;
- i = get_number();
- if (ntags)
- {
- if (i <= 0 || i > n)
- unknown_rhs(i);
- tag = pitem[nitems + i - n - 1]->tag;
- if (tag == 0)
- untyped_rhs(i, pitem[nitems + i - n - 1]->name),
- fprintf(f, "yyVals[%d+yyTop]", i - n);
- else if (strcmp(tag, "Object"))
- fprintf(f, "((%s)yyVals[%d+yyTop])", tag, i - n);
- else
- fprintf(f, "yyVals[%d+yyTop]", i - n);
- }
- else
- {
- if (i > n)
- dollar_warning(lineno, i);
- fprintf(f, "yyVals[%d+yyTop]", i - n);
- }
- goto loop;
- }
- else if (cptr[1] == '-')
- {
- cptr += 2;
- i = get_number();
- if (ntags)
- unknown_rhs(-i);
- fprintf(f, "yyVals[%d+yyTop]", -i - n);
- goto loop;
- }
- }
- if (isalpha(c) || c == '_' || c == '$')
- {
- do
- {
- putc(c, f);
- c = *++cptr;
- } while (isalnum(c) || c == '_' || c == '$');
- goto loop;
- }
- putc(c, f);
- ++cptr;
- switch (c)
- {
- case '\n':
- next_line:
- get_line();
- if (line) goto loop;
- unterminated_action(a_lineno, a_line, a_cptr);
-
- case ';':
- if (depth > 0) goto loop;
- fprintf(f, "\nbreak;\n");
- return;
-
- case '{':
- ++depth;
- goto loop;
-
- case '}':
- if (--depth > 0) goto loop;
- fprintf(f, "\n break;\n");
- return;
-
- case '\'':
- case '"':
- {
- int s_lineno = lineno;
- char *s_line = dup_line();
- char *s_cptr = s_line + (cptr - line - 1);
-
- quote = c;
- for (;;)
- {
- c = *cptr++;
- putc(c, f);
- if (c == quote)
- {
- FREE(s_line);
- goto loop;
- }
- if (c == '\n')
- unterminated_string(s_lineno, s_line, s_cptr);
- if (c == '\\')
- {
- c = *cptr++;
- putc(c, f);
- if (c == '\n')
- {
- get_line();
- if (line == 0)
- unterminated_string(s_lineno, s_line, s_cptr);
- }
- }
- }
- }
-
- case '/':
- c = *cptr;
- if (c == '/')
- {
- putc('*', f);
- while ((c = *++cptr) != '\n')
- {
- if (c == '*' && cptr[1] == '/')
- fprintf(f, "* ");
- else
- putc(c, f);
- }
- fprintf(f, "*/\n");
- goto next_line;
- }
- if (c == '*')
- {
- int c_lineno = lineno;
- char *c_line = dup_line();
- char *c_cptr = c_line + (cptr - line - 1);
-
- putc('*', f);
- ++cptr;
- for (;;)
- {
- c = *cptr++;
- putc(c, f);
- if (c == '*' && *cptr == '/')
- {
- putc('/', f);
- ++cptr;
- FREE(c_line);
- goto loop;
- }
- if (c == '\n')
- {
- get_line();
- if (line == 0)
- unterminated_comment(c_lineno, c_line, c_cptr);
- }
- }
- }
- goto loop;
-
- default:
- goto loop;
- }
-}
-
-
-int
-mark_symbol()
-{
- register int c;
- register bucket *bp;
-
- c = cptr[1];
- if (c == '%' || c == '\\')
- {
- cptr += 2;
- return (1);
- }
-
- if (c == '=')
- cptr += 2;
- else if ((c == 'p' || c == 'P') &&
- ((c = cptr[2]) == 'r' || c == 'R') &&
- ((c = cptr[3]) == 'e' || c == 'E') &&
- ((c = cptr[4]) == 'c' || c == 'C') &&
- ((c = cptr[5], !IS_IDENT(c))))
- cptr += 5;
- else
- syntax_error(lineno, line, cptr);
-
- c = nextc();
- if (isalpha(c) || c == '_' || c == '.' || c == '$')
- bp = get_name();
- else if (c == '\'' || c == '"')
- bp = get_literal();
- else
- {
- syntax_error(lineno, line, cptr);
- /*NOTREACHED*/
- }
-
- if (rprec[nrules] != UNDEFINED && bp->prec != rprec[nrules])
- prec_redeclared();
-
- rprec[nrules] = bp->prec;
- rassoc[nrules] = bp->assoc;
- return (0);
-}
-
-
-read_grammar()
-{
- register int c;
-
- initialize_grammar();
- advance_to_start();
-
- for (;;)
- {
- c = nextc();
- if (c == EOF) break;
- if (isalpha(c) || c == '_' || c == '.' || c == '$' || c == '\'' ||
- c == '"')
- add_symbol();
- else if (c == '{' || c == '=')
- copy_action();
- else if (c == '|')
- {
- end_rule();
- start_rule(plhs[nrules-1], 0);
- ++cptr;
- }
- else if (c == '%')
- {
- if (mark_symbol()) break;
- }
- else
- syntax_error(lineno, line, cptr);
- }
- end_rule();
-}
-
-
-free_tags()
-{
- register int i;
-
- if (tag_table == 0) return;
-
- for (i = 0; i < ntags; ++i)
- {
- assert(tag_table[i]);
- FREE(tag_table[i]);
- }
- FREE(tag_table);
-}
-
-
-pack_names()
-{
- register bucket *bp;
- register char *p, *s, *t;
-
- name_pool_size = 13; /* 13 == sizeof("$end") + sizeof("$accept") */
- for (bp = first_symbol; bp; bp = bp->next)
- name_pool_size += strlen(bp->name) + 1;
- name_pool = MALLOC(name_pool_size);
- if (name_pool == 0) no_space();
-
- strcpy(name_pool, "$accept");
- strcpy(name_pool+8, "$end");
- t = name_pool + 13;
- for (bp = first_symbol; bp; bp = bp->next)
- {
- p = t;
- s = bp->name;
- while (*t++ = *s++) continue;
- FREE(bp->name);
- bp->name = p;
- }
-}
-
-
-check_symbols()
-{
- register bucket *bp;
-
- if (goal->class == UNKNOWN)
- undefined_goal(goal->name);
-
- for (bp = first_symbol; bp; bp = bp->next)
- {
- if (bp->class == UNKNOWN)
- {
- undefined_symbol_warning(bp->name);
- bp->class = TERM;
- }
- }
-}
-
-
-pack_symbols()
-{
- register bucket *bp;
- register bucket **v;
- register int i, j, k, n;
-
- nsyms = 2;
- ntokens = 1;
- for (bp = first_symbol; bp; bp = bp->next)
- {
- ++nsyms;
- if (bp->class == TERM) ++ntokens;
- }
- start_symbol = ntokens;
- nvars = nsyms - ntokens;
-
- symbol_name = (char **) MALLOC(nsyms*sizeof(char *));
- if (symbol_name == 0) no_space();
- symbol_value = (short *) MALLOC(nsyms*sizeof(short));
- if (symbol_value == 0) no_space();
- symbol_prec = (short *) MALLOC(nsyms*sizeof(short));
- if (symbol_prec == 0) no_space();
- symbol_assoc = MALLOC(nsyms);
- if (symbol_assoc == 0) no_space();
-
- v = (bucket **) MALLOC(nsyms*sizeof(bucket *));
- if (v == 0) no_space();
-
- v[0] = 0;
- v[start_symbol] = 0;
-
- i = 1;
- j = start_symbol + 1;
- for (bp = first_symbol; bp; bp = bp->next)
- {
- if (bp->class == TERM)
- v[i++] = bp;
- else
- v[j++] = bp;
- }
- assert(i == ntokens && j == nsyms);
-
- for (i = 1; i < ntokens; ++i)
- v[i]->index = i;
-
- goal->index = start_symbol + 1;
- k = start_symbol + 2;
- while (++i < nsyms)
- if (v[i] != goal)
- {
- v[i]->index = k;
- ++k;
- }
-
- goal->value = 0;
- k = 1;
- for (i = start_symbol + 1; i < nsyms; ++i)
- {
- if (v[i] != goal)
- {
- v[i]->value = k;
- ++k;
- }
- }
-
- k = 0;
- for (i = 1; i < ntokens; ++i)
- {
- n = v[i]->value;
- if (n > 256)
- {
- for (j = k++; j > 0 && symbol_value[j-1] > n; --j)
- symbol_value[j] = symbol_value[j-1];
- symbol_value[j] = n;
- }
- }
-
- if (v[1]->value == UNDEFINED)
- v[1]->value = 256;
-
- j = 0;
- n = 257;
- for (i = 2; i < ntokens; ++i)
- {
- if (v[i]->value == UNDEFINED)
- {
- while (j < k && n == symbol_value[j])
- {
- while (++j < k && n == symbol_value[j]) continue;
- ++n;
- }
- v[i]->value = n;
- ++n;
- }
- }
-
- symbol_name[0] = name_pool + 8;
- symbol_value[0] = 0;
- symbol_prec[0] = 0;
- symbol_assoc[0] = TOKEN;
- for (i = 1; i < ntokens; ++i)
- {
- symbol_name[i] = v[i]->name;
- symbol_value[i] = v[i]->value;
- symbol_prec[i] = v[i]->prec;
- symbol_assoc[i] = v[i]->assoc;
- }
- symbol_name[start_symbol] = name_pool;
- symbol_value[start_symbol] = -1;
- symbol_prec[start_symbol] = 0;
- symbol_assoc[start_symbol] = TOKEN;
- for (++i; i < nsyms; ++i)
- {
- k = v[i]->index;
- symbol_name[k] = v[i]->name;
- symbol_value[k] = v[i]->value;
- symbol_prec[k] = v[i]->prec;
- symbol_assoc[k] = v[i]->assoc;
- }
-
- FREE(v);
-}
-
-
-pack_grammar()
-{
- register int i, j;
- int assoc, prec;
-
- ritem = (short *) MALLOC(nitems*sizeof(short));
- if (ritem == 0) no_space();
- rlhs = (short *) MALLOC(nrules*sizeof(short));
- if (rlhs == 0) no_space();
- rrhs = (short *) MALLOC((nrules+1)*sizeof(short));
- if (rrhs == 0) no_space();
- rprec = (short *) REALLOC(rprec, nrules*sizeof(short));
- if (rprec == 0) no_space();
- rassoc = REALLOC(rassoc, nrules);
- if (rassoc == 0) no_space();
-
- ritem[0] = -1;
- ritem[1] = goal->index;
- ritem[2] = 0;
- ritem[3] = -2;
- rlhs[0] = 0;
- rlhs[1] = 0;
- rlhs[2] = start_symbol;
- rrhs[0] = 0;
- rrhs[1] = 0;
- rrhs[2] = 1;
-
- j = 4;
- for (i = 3; i < nrules; ++i)
- {
- rlhs[i] = plhs[i]->index;
- rrhs[i] = j;
- assoc = TOKEN;
- prec = 0;
- while (pitem[j])
- {
- ritem[j] = pitem[j]->index;
- if (pitem[j]->class == TERM)
- {
- prec = pitem[j]->prec;
- assoc = pitem[j]->assoc;
- }
- ++j;
- }
- ritem[j] = -i;
- ++j;
- if (rprec[i] == UNDEFINED)
- {
- rprec[i] = prec;
- rassoc[i] = assoc;
- }
- }
- rrhs[i] = j;
-
- FREE(plhs);
- FREE(pitem);
-}
-
-
-print_grammar()
-{
- register int i, j, k;
- int spacing;
- register FILE *f = verbose_file;
-
- if (!vflag) return;
-
- k = 1;
- for (i = 2; i < nrules; ++i)
- {
- if (rlhs[i] != rlhs[i-1])
- {
- if (i != 2) fprintf(f, "\n");
- fprintf(f, "%4d %s :", i - 2, symbol_name[rlhs[i]]);
- spacing = strlen(symbol_name[rlhs[i]]) + 1;
- }
- else
- {
- fprintf(f, "%4d ", i - 2);
- j = spacing;
- while (--j >= 0) putc(' ', f);
- putc('|', f);
- }
-
- while (ritem[k] >= 0)
- {
- fprintf(f, " %s", symbol_name[ritem[k]]);
- ++k;
- }
- ++k;
- putc('\n', f);
- }
-}
-
-
-reader()
-{
- create_symbol_table();
- read_declarations();
- read_grammar();
- free_symbol_table();
- free_tags();
- pack_names();
- check_symbols();
- pack_symbols();
- pack_grammar();
- free_symbols();
- print_grammar();
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-20 21:58:17 +0300