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reader.c
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/* $OpenBSD: reader.c,v 1.23 2012/04/15 12:44:38 chl Exp $ */
/* $NetBSD: reader.c,v 1.5 1996/03/19 03:21:43 jtc Exp $ */
/*
* 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. 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.
*/
#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 accommodate it. */
#define LINESIZE 100
char *cache;
int cinc, cache_size;
int ntags, tagmax;
char **tag_table;
char saw_eof, unionized;
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;
void cachec(int);
void get_line(void);
char * dup_line(void);
void skip_comment(void);
int nextc(void);
int keyword(void);
void copy_ident(void);
void copy_text(void);
void copy_union(void);
int hexval(int);
bucket * get_literal(void);
int is_reserved(char *);
bucket * get_name(void);
int get_number(void);
char * get_tag(void);
void declare_tokens(int);
void declare_types(void);
void declare_start(void);
void handle_expect(void);
void read_declarations(void);
void initialize_grammar(void);
void expand_items(void);
void expand_rules(void);
void advance_to_start(void);
void start_rule(bucket *, int);
void end_rule(void);
void insert_empty_rule(void);
void add_symbol(void);
void copy_action(void);
int mark_symbol(void);
void read_grammar(void);
void free_tags(void);
void pack_names(void);
void check_symbols(void);
void pack_symbols(void);
void pack_grammar(void);
void print_grammar(void);
char line_format[] = "#line %d \"%s\"\n";
void
cachec(int c)
{
assert(cinc >= 0);
if (cinc >= cache_size)
{
cache_size += 256;
cache = REALLOC(cache, cache_size);
if (cache == NULL) no_space();
}
cache[cinc] = c;
++cinc;
}
void
get_line(void)
{
FILE *f = input_file;
int c;
int i;
if (saw_eof || (c = getc(f)) == EOF)
{
if (line) { FREE(line); line = 0; }
cptr = 0;
saw_eof = 1;
return;
}
if (line == NULL || linesize != (LINESIZE + 1))
{
if (line) FREE(line);
linesize = LINESIZE + 1;
line = MALLOC(linesize);
if (line == NULL) 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(void)
{
char *p, *s, *t;
if (line == NULL) return (0);
s = line;
while (*s != '\n') ++s;
p = MALLOC(s - line + 1);
if (p == NULL) no_space();
s = line;
t = p;
while ((*t++ = *s++) != '\n') continue;
return (p);
}
void
skip_comment(void)
{
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 == NULL)
unterminated_comment(st_lineno, st_line, st_cptr);
s = cptr;
}
else
++s;
}
}
int
nextc(void)
{
char *s;
if (line == NULL)
{
get_line();
if (line == NULL)
return (EOF);
}
s = cptr;
for (;;)
{
switch (*s)
{
case '\n':
get_line();
if (line == NULL) 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 == NULL) return (EOF);
s = cptr;
break;
}
/* fall through */
default:
cptr = s;
return (*s);
}
}
}
int
keyword(void)
{
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);
if (strcmp(cache, "union") == 0)
return (UNION);
if (strcmp(cache, "ident") == 0)
return (IDENT);
if (strcmp(cache, "expect") == 0)
return (EXPECT);
}
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*/
return (0);
}
void
copy_ident(void)
{
int c;
FILE *f = output_file;
c = nextc();
if (c == EOF) unexpected_EOF();
if (c != '"') syntax_error(lineno, line, cptr);
++outline;
fprintf(f, "#ident \"");
for (;;)
{
c = *++cptr;
if (c == '\n')
{
fprintf(f, "\"\n");
return;
}
putc(c, f);
if (c == '"')
{
putc('\n', f);
++cptr;
return;
}
}
}
void
copy_text(void)
{
int c;
int quote;
FILE *f = text_file;
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 == NULL)
unterminated_text(t_lineno, t_line, t_cptr);
}
if (!lflag) 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 == NULL)
unterminated_string(s_lineno, s_line, s_cptr);
}
}
}
}
case '/':
putc(c, f);
need_newline = 1;
c = *cptr;
if (c == '/')
{
putc('*', f);
while ((c = *++cptr) != '\n')
{
if (c == '*' && cptr[1] == '/')
fprintf(f, "* ");
else
putc(c, f);
}
fprintf(f, "*/");
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 == NULL)
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;
}
}
void
copy_union(void)
{
int c;
int quote;
int depth;
int u_lineno = lineno;
char *u_line = dup_line();
char *u_cptr = u_line + (cptr - line - 6);
if (unionized) over_unionized(cptr - 6);
unionized = 1;
if (!lflag)
fprintf(text_file, line_format, lineno, input_file_name);
fprintf(text_file, "#ifndef YYSTYPE_DEFINED\n");
fprintf(text_file, "#define YYSTYPE_DEFINED\n");
fprintf(text_file, "typedef union");
if (dflag) fprintf(union_file, "#ifndef YYSTYPE_DEFINED\n");
if (dflag) fprintf(union_file, "#define YYSTYPE_DEFINED\n");
if (dflag) fprintf(union_file, "typedef union");
depth = 0;
loop:
c = *cptr++;
putc(c, text_file);
if (dflag) putc(c, union_file);
switch (c)
{
case '\n':
next_line:
get_line();
if (line == NULL) unterminated_union(u_lineno, u_line, u_cptr);
goto loop;
case '{':
++depth;
goto loop;
case '}':
if (--depth == 0)
{
fprintf(text_file, " YYSTYPE;\n");
fprintf(text_file, "#endif /* YYSTYPE_DEFINED */\n");
FREE(u_line);
return;
}
goto loop;
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, text_file);
if (dflag) putc(c, union_file);
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, text_file);
if (dflag) putc(c, union_file);
if (c == '\n')
{
get_line();
if (line == NULL)
unterminated_string(s_lineno, s_line, s_cptr);
}
}
}
}
case '/':
c = *cptr;
if (c == '/')
{
putc('*', text_file);
if (dflag) putc('*', union_file);
while ((c = *++cptr) != '\n')
{
if (c == '*' && cptr[1] == '/')
{
fprintf(text_file, "* ");
if (dflag) fprintf(union_file, "* ");
}
else
{
putc(c, text_file);
if (dflag) putc(c, union_file);
}
}
fprintf(text_file, "*/\n");
if (dflag) fprintf(union_file, "*/\n");
goto next_line;
}
if (c == '*')
{
int c_lineno = lineno;
char *c_line = dup_line();
char *c_cptr = c_line + (cptr - line - 1);
putc('*', text_file);
if (dflag) putc('*', union_file);
++cptr;
for (;;)
{
c = *cptr++;
putc(c, text_file);
if (dflag) putc(c, union_file);
if (c == '*' && *cptr == '/')
{
putc('/', text_file);
if (dflag) putc('/', union_file);
++cptr;
FREE(c_line);
goto loop;
}
if (c == '\n')
{
get_line();
if (line == NULL)
unterminated_comment(c_lineno, c_line, c_cptr);
}
}
}
goto loop;
default:
goto loop;
}
}
int
hexval(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(void)
{
int c, quote;
int i;
int n;
char *s;
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 == NULL) 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 == NULL) no_space();
memcpy(s, cache, n);
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(char *name)
{
char *s;
if (strcmp(name, ".") == 0 ||
strcmp(name, "$accept") == 0 ||
strcmp(name, "$end") == 0)
return (1);
if (name[0] == '$' && name[1] == '$' && isdigit(name[2]))
{
s = name + 3;
while (isdigit(*s)) ++s;
if (*s == NUL) return (1);
}
return (0);
}
bucket *
get_name(void)
{
int c;
cinc = 0;
for (c = *cptr; IS_IDENT(c); c = *++cptr)
cachec(c);
cachec(NUL);
if (is_reserved(cache)) used_reserved(cache);
return (lookup(cache));
}
int
get_number(void)
{
int c;
int n;
n = 0;
for (c = *cptr; isdigit(c); c = *++cptr)
n = 10*n + (c - '0');
return (n);
}
char *
get_tag(void)
{
int c;
int i;
char *s;
int t_lineno = lineno;
char *t_line = dup_line();
char *t_cptr = t_line + (cptr - line);
++cptr;
c = nextc();
if (c == EOF) unexpected_EOF();
if (!isalpha(c) && c != '_' && c != '$')
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);
FREE(t_line);
++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 == NULL) no_space();
}
s = MALLOC(cinc);
if (s == NULL) no_space();
strlcpy(s, cache, cinc);
tag_table[ntags] = s;
++ntags;
return (s);
}
void
declare_tokens(int assoc)
{
int c;
bucket *bp;
int value;
char *tag = 0;
if (assoc != TOKEN) ++prec;
c = nextc();
if (c == EOF) unexpected_EOF();
if (c == '<')
{
tag = get_tag();
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();
}
}
}
/*
* %expect requires special handling
* as it really isn't part of the yacc
* grammar only a flag for yacc proper.
*/
void
declare_expect(int assoc)
{
int c;
if (assoc != EXPECT) ++prec;
/*
* Stay away from nextc - doesn't
* detect EOL and will read to EOF.
*/
c = *++cptr;
if (c == EOF) unexpected_EOF();
for (;;)
{
if (isdigit(c))
{
SRexpect = get_number();
break;
}
/*
* Looking for number before EOL.
* Spaces, tabs, and numbers are ok,
* words, punc., etc. are syntax errors.