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reader.c
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reader.c
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#include "defs.h"
#include "mstring.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
/* the maximum nember of arguments (inherited attributes) to a non-terminal */
/* this is a hard limit, but seems more than adequate */
#define MAXARGS 20
file_info *input_file = 0;
static char *cache;
static int cinc, cache_size;
int havetags=0;
static union_tag *tag_table = 0;
char saw_eof, unionized, location_defined;
char *cptr, *line;
int linesize;
static struct ifdef_state {
struct ifdef_state *next;
file_info *file;
int lineno;
int state; /* 0 = in true part
* 1 = in false part looking for else/end
* 2 = in false part looking for end */
int nested;
} *ifdef = 0;
#define MAX_DEFD_VARS 1000
char *defd_vars[MAX_DEFD_VARS] = {NULL};
static bucket *goal;
static int prec;
static int gensym;
static char last_was_action, trialaction;
static int maxitems;
static bucket **pitem;
static int maxrules;
static bucket **plhs;
static int name_pool_size;
static char *name_pool;
char line_format[] = "#line %d \"%s\"\n";
static int cachec(int c)
{
assert(cinc >= 0);
if (cinc >= cache_size) {
if (!(cache = REALLOC(cache, cache_size += 256))) no_space(); }
return cache[cinc++] = c;
}
/*
* Open a file for input and make future input come from it
*
*/
void read_from_file(char *name)
{
file_info *n;
FILE *fp;
if (!name) {
fp = stdin;
} else if (!(fp = fopen(name, "r"))) {
if (!input_file)
open_error(name); /* fatal -- does not return */
error(input_file->lineno, 0, 0, "Cannot open include file %s", name);
return; }
n = NEW(file_info);
n->next = input_file;
n->file = fp;
n->name = name ? strdup(name) : 0;
n->lineno = 0;
input_file = n;
}
/*
* Get line
* Return: 1 - reg. line finished with '\n'.
* 0 - EOF.
*/
char *get_line() {
extern int Eflag;
int c;
int i;
NextLine:;
i = 0;
if (saw_eof || (c = getc(input_file->file)) == EOF) {
/* end of current file */
if (input_file->next) {
void *t = input_file;
while (ifdef && ifdef->file == input_file) {
void *t1 = ifdef;
error(ifdef->lineno, 0, 0, "No %%endif for %%if");
ifdef = ifdef->next;
FREE(t1); }
fclose(input_file->file);
FREE(input_file->name);
input_file = input_file->next;
FREE(t);
goto NextLine;
}
if (line) FREE(line);
saw_eof = 1;
return line = cptr = 0;
}
if (line == 0 || linesize != (LINESIZE + 1)) {
if (line) FREE(line);
linesize = LINESIZE + 1;
if (!(line = MALLOC(linesize))) no_space();
}
++input_file->lineno;
while ((line[i] = c) != '\n') {
if (++i + 1 >= linesize)
if (!(line = REALLOC(line, linesize += LINESIZE)))
no_space();
if ((c = getc(input_file->file)) == EOF) {
c = '\n';
saw_eof = 1;
}
}
line[i+1] = 0;
/* VM: process %ifdef/%ifndef line */
if (!strncmp(&line[0], "%ifdef ", 7) || !strncmp(&line[0], "%ifndef ", 8)) {
char *var_name = line + 7;
char **ps;
while (isspace(*var_name)) var_name++;
for(i=0; var_name[i]!='\n' && var_name[i]!=' '; i++);
var_name[i] = 0;
if (ifdef && ifdef->state) {
ifdef->nested++;
} else {
struct ifdef_state *n = NEW(struct ifdef_state);
n->next = ifdef;
n->file = input_file;
n->lineno = input_file->lineno;
n->state = line[3] != 'n';
n->nested = 0;
ifdef = n;
/* Find the preprocessor variable */
for(ps=&defd_vars[0]; *ps; ps++) {
if(strcmp(*ps,var_name)==0) {
n->state ^= 1;
break;
}
}
}
goto NextLine;
}
/* VM: process %endif line */
if(strncmp(&line[0], "%endif", 6)==0) {
if(!ifdef || ifdef->file != input_file) {
error(input_file->lineno, 0, 0, "There is no corresponding %%ifdef for %%endif");
} else {
if (ifdef->nested)
ifdef->nested--;
else {
void *t = ifdef;
ifdef = ifdef->next;
FREE(t);
}
}
goto NextLine;
}
/* VM: skip ordinary lines if ordered by %endif */
if (ifdef && ifdef->state) {
goto NextLine;
}
/* VM: Process %include line */
if(strncmp(&line[0], "%include ", 9)==0) {
char *name = line+9;
while (isspace(*name)) name++;
for(i=0; name[i]!='\n' && name[i]!=' '; i++);
name[i] = 0;
read_from_file(name);
goto NextLine;
}
/* VM: process %define line */
if(strncmp(&line[0], "%define ", 8)==0) {
char var_name[80];
int ii=0;
char **ps;
for(i=8; line[i]!='\n' && line[i]!=' '; i++, ii++) {
var_name[ii] = line[i];
}
var_name[ii] = 0;
/* Find the preprocessor variable */
for(ps=&defd_vars[0]; *ps; ps++) {
if(strcmp(*ps,var_name)==0) {
error(input_file->lineno, 0, 0, "Preprocessor variable %s already defined", var_name);
}
}
*ps = MALLOC(strlen(var_name)+1);
strcpy(*ps, var_name);
*++ps = NULL;
goto NextLine;
}
if(Eflag) {
printf("YPP: %s", line);
}
return cptr = line;
}
char *dup_line()
{
register char *p, *s, *t;
if (line == 0) return (0);
s = line;
while (*s != '\n') ++s;
if (!(p = MALLOC(s - line + 1))) no_space();
s = line;
t = p;
while ((*t++ = *s++) != '\n');
return (p);
}
char *skip_comment()
{
register char *s;
int st_lineno = input_file->lineno;
char *st_line = dup_line();
char *st_cptr = st_line + (cptr - line);
s = cptr + 2;
while (s[0] != '*' || s[1] != '/') {
if (*s == '\n') {
if ((s = get_line()) == 0)
unterminated_comment(st_lineno, st_line, st_cptr); }
else
++s; }
FREE(st_line);
return cptr = s + 2;
}
int nextc()
{
register char *s;
if (line == 0 && get_line() == 0)
return (EOF);
s = cptr;
for (;;) {
switch (*s) {
case '\n':
if ((s = get_line()) == 0) return EOF;
break;
case ' ':
case '\t':
case '\f':
case '\r':
case '\v':
case ',':
case ';':
++s;
break;
case '\\':
cptr = s;
return ('%');
case '/':
if (s[1] == '*') {
cptr = s;
s = skip_comment();
break; }
else if (s[1] == '/') {
if ((s = get_line()) == 0) return EOF;
break; }
/* fall through */
default:
cptr = s;
return (*s); } }
}
static struct keyword { char name[12]; int token; } keywords[] = {
{ "binary", NONASSOC },
{ "destructor", DESTRUCTOR },
{ "ident", IDENT },
{ "left", LEFT },
{ "location", LOCATION },
{ "nonassoc", NONASSOC },
{ "position", LOCATION },
{ "right", RIGHT },
{ "start", START },
{ "term", TOKEN },
{ "token", TOKEN },
{ "type", TYPE },
{ "union", UNION },
};
int keyword()
{
register int c;
char *t_cptr = cptr;
struct keyword *key;
c = *++cptr;
if (isalpha(c)) {
cinc = 0;
while (isalnum(c) || c == '_' || c == '.' || c == '$') {
cachec(tolower(c));
c = *++cptr;
}
cachec(NUL);
if ((key = bsearch(cache, keywords, sizeof(keywords)/sizeof(*key),
sizeof(*key),
(int (*)(const void *, const void *))strcmp)))
return key->token;
} else {
++cptr;
if (c == '{') return (TEXT);
if (c == '%' || c == '\\') return (MARK);
if (c == '<') return (LEFT);
if (c == '>') return (RIGHT);
if (c == '0') return (TOKEN);
if (c == '2') return (NONASSOC);
if (c == '@') return (LOCATION);
if (c == '$') return (UNION);
}
syntax_error(input_file->lineno, line, t_cptr);
/*NOTREACHED*/
return 0;
}
void copy_ident()
{
register int c;
register FILE *f = output_file;
if ((c = nextc()) == EOF) unexpected_EOF();
if (c != '"') syntax_error(input_file->lineno, line, cptr);
if (!rflag) ++outline;
fprintf(f, "#ident \"");
for (;;) {
c = *++cptr;
if (c == '\n') {
fprintf(f, "\"\n");
return; }
putc(c, f);
if (c == '"') {
putc('\n', f);
++cptr;
return; } }
}
#define OUTC(c) do { /* output a character on f1 and f2, if non-null */ \
int _c = (c); \
putc(_c, f1); \
if (f2) putc(_c, f2); \
} while(0)
void copy_string(int quote, FILE *f1, FILE *f2)
{
register int c;
int s_lineno = input_file->lineno;
char *s_line = dup_line();
char *s_cptr = s_line + (cptr - line - 1);
for (;;) {
OUTC(c = *cptr++);
if (c == quote) {
FREE(s_line);
return; }
if (c == '\n')
unterminated_string(s_lineno, s_line, s_cptr);
if (c == '\\') {
OUTC(c = *cptr++);
if (c == '\n') {
if (get_line() == 0)
unterminated_string(s_lineno, s_line, s_cptr); } } }
}
void copy_comment(FILE *f1, FILE *f2)
{
register int c;
if ((c = *cptr) == '/') {
OUTC('*');
while ((c = *++cptr) != '\n') {
OUTC(c);
if (c == '*' && cptr[1] == '/')
OUTC(' '); }
OUTC('*'); OUTC('/'); }
else if (c == '*') {
int c_lineno = input_file->lineno;
char *c_line = dup_line();
char *c_cptr = c_line + (cptr - line - 1);
OUTC(c);
while ((c = *++cptr) != '*' || cptr[1] != '/') {
OUTC(c);
if (c == '\n') {
if (get_line() == 0)
unterminated_comment(c_lineno, c_line, c_cptr); } }
OUTC(c);
OUTC('/');
FREE(c_line);
cptr += 2; }
}
#undef OUTC
void copy_text()
{
register int c;
register FILE *f = text_file;
int need_newline = 0;
int t_lineno = input_file->lineno;
char *t_line = dup_line();
char *t_cptr = t_line + (cptr - line - 2);
if (*cptr == '\n') {
if (get_line() == 0)
unterminated_text(t_lineno, t_line, t_cptr); }
if (!lflag) fprintf(f, line_format, input_file->lineno, input_file->name);
loop:
switch (c = *cptr++) {
case '\n':
putc('\n', f);
need_newline = 0;
if (get_line()) goto loop;
unterminated_text(t_lineno, t_line, t_cptr);
case '\'':
case '"':
putc(c, f);
copy_string(c, f, 0);
need_newline = 1;
goto loop;
case '/':
putc(c, f);
copy_comment(f, 0);
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_structdecl(const char *kind, const char *name)
{
FILE *dc_file;
register int c;
int depth;
int u_lineno = input_file->lineno;
char *u_line = dup_line();
char *u_cptr = u_line + (cptr - line - 6);
if (dflag && !include_defines) {
fprintf(text_file, "#include \"%s\"\n\n", defines_file_name);
include_defines = 1; }
/* VM: Print to either code file or defines file but not to both */
dc_file = dflag ? union_file : text_file;
fprintf(dc_file, "\n");
if (!lflag)
fprintf(dc_file, line_format, input_file->lineno, input_file->name);
fprintf(dc_file, "typedef %s", kind);
depth = 0;
loop:
c = *cptr++;
putc(c, dc_file);
switch (c) {
case '\n':
get_line();
if (line == 0) unterminated_union(u_lineno, u_line, u_cptr);
goto loop;
case '{':
++depth;
goto loop;
case '}':
if (--depth == 0) {
fprintf(dc_file, " %s;\n", name);
FREE(u_line);
break; }
goto loop;
case '\'':
case '"':
copy_string(c, dc_file, 0);
goto loop;
case '/':
copy_comment(dc_file, 0);
goto loop;
default:
goto loop;
}
fprintf(dc_file, "#define %s %s\n", name, name);
}
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()
{
register int c, quote;
register int i;
register int n;
register char *s;
register bucket *bp;
int s_lineno = input_file->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 > UCHAR_MAX) 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 > UCHAR_MAX) 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(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);
}
static union_tag *cache_tag(char *tag, int len)
{
union_tag **p, *rv;
for (p = &tag_table; *p; p = &(*p)->next) {
if (strncmp(tag, (*p)->name, len) == 0 && (*p)->name[len] == 0)
return *p; }
if (!(*p = rv = NEW(union_tag))) no_space();
if (!(rv->name = MALLOC(len + 1))) no_space();
rv->next = 0;
strncpy(rv->name, tag, len);
rv->name[len] = 0;
rv->dtor = 0;
return rv;
}
union_tag *get_tag(int braces)
{
register int c = *cptr;
int t_lineno = input_file->lineno;
char *t_line = dup_line();
char *t_cptr = t_line + (cptr - line);
if (braces) {
if (c != '<')
illegal_tag(t_lineno, t_line, t_cptr);
++cptr;
c = nextc();
if (c == EOF) unexpected_EOF(); }
if (!isalpha(c) && c != '_' && c != '$')
illegal_tag(t_lineno, t_line, t_cptr);
cinc = 0;
do { cachec(c); c = *++cptr; } while (IS_IDENT(c));
if (braces) {
c = nextc();
if (c == EOF) unexpected_EOF();
if (c != '>')
illegal_tag(t_lineno, t_line, t_cptr);
++cptr; }
FREE(t_line);
havetags = 1;
return cache_tag(cache, cinc);
}
void declare_tokens(int assoc)
{
register int c;
register bucket *bp;
int value;
union_tag *tag = 0;
if (assoc != TOKEN) ++prec;
c = nextc();
if (c == EOF) unexpected_EOF();
if (c == '<') {
tag = get_tag(1);
c = nextc();
if (c == EOF) unexpected_EOF(); }
for (;;) {
if (isalpha(c) || c == '_' || c == '.' || c == '$')
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(); } }
}
static void declare_argtypes(bucket *bp)
{
char *tags[MAXARGS];
int args = 0, c;
if (bp->args >= 0) retyped_warning(bp->name);
cptr++; /* skip open paren */
for (;;) {
c = nextc();
if (c == EOF) unexpected_EOF();
if (c != '<') syntax_error(input_file->lineno, line, cptr);
tags[args++] = get_tag(1)->name;
c = nextc();
if (c == ')') break;
if (c == EOF) unexpected_EOF(); }
cptr++; /* skip close paren */
bp->args = args;
if (!(bp->argnames = NEW2(args, char *))) no_space();
if (!(bp->argtags = NEW2(args, char *))) no_space();
while (--args >= 0) {
bp->argtags[args] = tags[args];
bp->argnames[args] = 0; }
}
void declare_types()
{
register int c;
register bucket *bp=0;
union_tag *tag=0;
c = nextc();
if (c == '<') {
tag = get_tag(1);
c = nextc(); }
if (c == EOF) unexpected_EOF();
for (;;) {
c = nextc();
if (isalpha(c) || c == '_' || c == '.' || c == '$') {
bp = get_name();
if (nextc() == '(')
declare_argtypes(bp);
else
bp->args = 0; }
else if (c == '\'' || c == '"') {
bp = get_literal();
bp->args = 0; }
else
return;
if (tag) {
if (bp->tag && tag != bp->tag)
retyped_warning(bp->name);
bp->tag = tag; } }
}
void declare_start()
{
register int c;
register bucket *bp;
c = nextc();
if (c == EOF) unexpected_EOF();
if (!isalpha(c) && c != '_' && c != '.' && c != '$')
syntax_error(input_file->lineno, line, cptr);
bp = get_name();
if (bp->class == TERM)
terminal_start(bp->name);
if (goal && goal != bp)
restarted_warning();
goal = bp;
}
void 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(input_file->lineno, line, cptr);
switch (k = keyword()) {
case MARK:
return;
case IDENT:
copy_ident();
break;
case TEXT:
copy_text();
break;
case UNION:
if (unionized) over_unionized(cptr - 6);
unionized = 1;
copy_structdecl("union", "YYSTYPE");
break;
case TOKEN:
case LEFT:
case RIGHT:
case NONASSOC:
declare_tokens(k);
break;
case TYPE:
declare_types();
break;
case DESTRUCTOR:
declare_destructor();
break;
case LOCATION:
if (location_defined) repeat_location_defined(cptr - 9);
location_defined = 1;
copy_structdecl("struct", "YYPOSN");
break;
case START:
declare_start();
break; } }
}
void initialize_grammar()
{
nitems = 4;
maxitems = 300;
pitem = NEW2(maxitems, bucket *);
if (pitem == 0) no_space();
pitem[0] = 0;
pitem[1] = 0;
pitem[2] = 0;
pitem[3] = 0;
nrules = 3;
maxrules = 100;
plhs = NEW2(maxrules, bucket *);
if (plhs == 0) no_space();
plhs[0] = 0;
plhs[1] = 0;
plhs[2] = 0;
rprec = NEW2(maxrules, Yshort);
if (rprec == 0) no_space();
rprec[0] = 0;
rprec[1] = 0;
rprec[2] = 0;
rassoc = NEW2(maxrules, char);
if (rassoc == 0) no_space();
rassoc[0] = TOKEN;
rassoc[1] = TOKEN;
rassoc[2] = TOKEN;
}
void expand_items()
{
maxitems += 300;
pitem = RENEW(pitem, maxitems, bucket *);
if (pitem == 0) no_space();
}
void expand_rules()
{
maxrules += 100;
plhs = RENEW(plhs, maxrules, bucket *);
if (plhs == 0) no_space();
rprec = RENEW(rprec, maxrules, Yshort);
if (rprec == 0) no_space();
rassoc = RENEW(rassoc, maxrules, char);
if (rassoc == 0) no_space();
}
/* set in copy_args and incremented by the various routines that will rescan
** the argument list as appropriate */
static int rescan_lineno;
static char *copy_args(int *alen)
{
struct mstring *s = msnew();
int depth = 0, len = 1, c;
char quote = 0;
int a_lineno = input_file->lineno;
char *a_line = dup_line();
char *a_cptr = a_line + (cptr - line - 1);
int skipspace = 1;
rescan_lineno = input_file->lineno;
while ((c = *cptr++) != ')' || depth || quote) {
if (c == ',' && !quote && !depth) {
len++;
mstrim(s, " ");
mputc(s, 0);
skipspace = 1;
continue; }
if (!quote && c == '/' && (*cptr == '/' || *cptr == '*')) {
if (*cptr == '/') {
c = '\n';
} else {
cptr--;
skip_comment();
c = ' '; } }
if (!quote && isspace(c)) {
if (!skipspace) {
mputc(s, ' ');
skipspace = 1; }
} else {
mputc(s, c);
skipspace = 0; }
if (c == '\n') {
get_line();
if (!line) {
if (quote)
unterminated_string(a_lineno, a_line, a_cptr);
else
unterminated_arglist(a_lineno, a_line, a_cptr); } }
else if (quote) {
if (c == quote) quote = 0;
else if (c == '\\') {
if (*cptr != '\n') mputc(s, *cptr++); } }
else {
if (c == '(') depth++;
else if (c == ')') depth--;
else if (c == '\"' || c == '\'') quote = c; } }
if (alen) *alen = len;
FREE(a_line);
mstrim(s, " ");
return msdone(s);
}