} symbol_list;
int lineno;
-char **tags;
short *user_toknums;
static symbol_list *grammar;
static int start_flag;
/* Incremented for each %left, %right or %nonassoc seen */
static int lastprec;
-static bucket *errtoken;
-static bucket *undeftoken;
-
+static bucket *errtoken = NULL;
+static bucket *undeftoken = NULL;
+static bucket *eoftoken = NULL;
+static bucket *axiom = NULL;
static symbol_list *
symbol_list_new (bucket *sym)
ungetc (c, fin);
n = read_signed_integer (fin);
-
- obstack_fgrow1 (oout, "yylsp[%d]", n - stack_offset);
- locations_flag = 1;
+ if (n > stack_offset)
+ complain (_("invalid value: %s%d"), "@", n);
+ else
+ {
+ /* Offset is always 0 if parser has already popped the stack
+ pointer. */
+ obstack_fgrow1 (oout, "yylsp[%d]",
+ n - (semantic_parser ? 0 : stack_offset));
+ locations_flag = 1;
+ }
}
else
{
ungetc (c, fin);
n = read_signed_integer (fin);
- if (!type_name && n > 0)
- type_name = get_type_name (n, rule);
-
- obstack_fgrow1 (oout, "yyvsp[%d]", n - stack_offset);
-
- if (type_name)
- obstack_fgrow1 (oout, ".%s", type_name);
- if (!type_name && typed)
- complain (_("$%d of `%s' has no declared type"),
- n, rule->sym->tag);
+ if (n > stack_offset)
+ complain (_("invalid value: %s%d"), "$", n);
+ else
+ {
+ if (!type_name && n > 0)
+ type_name = get_type_name (n, rule);
+
+ /* Offset is always 0 if parser has already popped the stack
+ pointer. */
+ obstack_fgrow1 (oout, "yyvsp[%d]",
+ n - (semantic_parser ? 0 : stack_offset));
+
+ if (type_name)
+ obstack_fgrow1 (oout, ".%s", type_name);
+ if (!type_name && typed)
+ complain (_("$%d of `%s' has no declared type"),
+ n, rule->sym->tag);
+ }
}
else
{
{
obstack_fgrow2 (&attrs_obstack, muscle_find ("linef"),
lineno, quotearg_style (c_quoting_style,
- muscle_find("filename")));
+ muscle_find ("filename")));
}
after_percent = 0;
else if (symbol && token == tok_number)
{
symbol->user_token_number = numval;
+ /* User defined EOF token? */
+ if (numval == 0)
+ eoftoken = symbol;
}
else
{
nsyms--;
}
+
static void
parse_muscle_decl (void)
{
int ch = ungetc (skip_white_space (), finput);
- char* muscle_key;
- char* muscle_value;
+ char *muscle_key;
+ char *muscle_value;
/* Read key. */
if (!isalpha (ch) && ch != '_')
| values in the current rule so far, which says where to find `$0' |
| with respect to the top of the stack. |
| |
-| This routine is used both for actions and guards. Only the |
-| actions_obstack is used, but this is fine, since we use only |
+| This routine is used both for actions and guards. Only |
+| ACTION_OBSTACK is used, but this is fine, since we use only |
| pointers to relevant portions inside this obstack. |
`-------------------------------------------------------------------*/
int c;
int count;
- /* offset is always 0 if parser has already popped the stack pointer */
- if (semantic_parser)
- stack_offset = 0;
-
count = 1;
while (count > 0)
{
t = lex ();
}
-
/* grammar has been read. Do some checking */
- if (nsyms > MAXSHORT)
- fatal (_("too many symbols (tokens plus nonterminals); maximum %d"),
- MAXSHORT);
if (nrules == 0)
fatal (_("no rules in the input grammar"));
bp->value = nvars++;
}
+ /* Insert the initial rule, which line is that of the first rule
+ (not that of the start symbol):
+
+ axiom: %start EOF. */
+ p = symbol_list_new (axiom);
+ p->line = grammar->line;
+ p->next = symbol_list_new (startval);
+ p->next->next = symbol_list_new (eoftoken);
+ p->next->next->next = symbol_list_new (NULL);
+ p->next->next->next->next = grammar;
+ nrules += 1;
+ nitems += 3;
+ grammar = p;
+ startval = axiom;
+
+ if (nsyms > MAXSHORT)
+ fatal (_("too many symbols (tokens plus nonterminals); maximum %d"),
+ MAXSHORT);
+
ntokens = nsyms - nvars;
}
{
obstack_fgrow2 (&el_obstack, muscle_find ("linef"),
lineno, quotearg_style (c_quoting_style,
- muscle_find("filename")));
+ muscle_find ("filename")));
}
while ((c = getc (finput)) != EOF)
/* A token which translation has already been set? */
if (token_translations[bp->user_token_number] != 2)
complain (_("tokens %s and %s both assigned number %d"),
- tags[token_translations[bp->user_token_number]],
+ symbols[token_translations[bp->user_token_number]]->tag,
bp->tag, bp->user_token_number);
token_translations[bp->user_token_number] = bp->value;
}
}
-/*------------------------------------------------------------------.
-| Assign symbol numbers, and write definition of token names into |
-| FDEFINES. Set up vectors TAGS and SPREC of names and precedences |
-| of symbols. |
-`------------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| Assign symbol numbers, and write definition of token names into |
+| FDEFINES. Set up vectors SYMBOL_TABLE, TAGS of symbols. |
+`----------------------------------------------------------------*/
static void
packsymbols (void)
bucket *bp = NULL;
int tokno = 1;
int last_user_token_number;
- static char DOLLAR[] = "$";
- tags = XCALLOC (char *, nsyms + 1);
user_toknums = XCALLOC (short, nsyms + 1);
-
- sprec = XCALLOC (short, nsyms);
- sassoc = XCALLOC (short, nsyms);
-
- /* The EOF token. */
- tags[0] = DOLLAR;
- user_toknums[0] = 0;
+ symbols = XCALLOC (bucket *, nsyms);
max_user_token_number = 256;
last_user_token_number = 256;
}
else if (bp->alias)
{
- /* this symbol and its alias are a single token defn.
- allocate a tokno, and assign to both check agreement of
- ->prec and ->assoc fields and make both the same */
- if (bp->value == 0)
- bp->value = bp->alias->value = tokno++;
+ /* This symbol and its alias are a single token defn.
+ Allocate a tokno, and assign to both check agreement of
+ prec and assoc fields and make both the same */
+ if (bp->value == -1)
+ {
+ if (bp == eoftoken || bp->alias == eoftoken)
+ bp->value = bp->alias->value = 0;
+ else
+ {
+ bp->value = bp->alias->value = tokno++;
+ }
+ }
if (bp->prec != bp->alias->prec)
{
bp->assoc = bp->alias->assoc;
}
+ /* Do not do processing below for SALIASs. */
if (bp->user_token_number == SALIAS)
- continue; /* do not do processing below for SALIASs */
+ continue;
}
- else /* bp->class == token_sym */
+ else /* bp->class == token_sym */
{
- bp->value = tokno++;
+ if (bp == eoftoken)
+ bp->value = 0;
+ else
+ bp->value = tokno++;
}
if (bp->class == token_sym)
max_user_token_number = bp->user_token_number;
}
- tags[bp->value] = bp->tag;
+ symbols[bp->value] = bp;
user_toknums[bp->value] = bp->user_token_number;
- sprec[bp->value] = bp->prec;
- sassoc[bp->value] = bp->assoc;
}
token_translations_init ();
{
struct obstack tokendefs;
bucket *bp;
- char *cp, *symbol;
- char c;
obstack_init (&tokendefs);
for (bp = firstsymbol; bp; bp = bp->next)
{
- symbol = bp->tag; /* get symbol */
+ char *symbol = bp->tag; /* get symbol */
if (bp->value >= ntokens)
continue;
}
/* Don't #define nonliteral tokens whose names contain periods. */
- cp = symbol;
- while ((c = *cp++) && c != '.');
- if (c != '\0')
+ if (strchr (symbol, '.'))
continue;
obstack_fgrow2 (&tokendefs, "# define %s\t%d\n",
}
ritem[itemno] = 0;
+ nritems = itemno;
+ assert (nritems == nitems);
if (trace_flag)
ritem_print (stderr);
start_flag = 0;
startval = NULL; /* start symbol not specified yet. */
- nsyms = 1;
+ nsyms = 0;
nvars = 0;
nrules = 0;
nitems = 0;
/* Initialize the symbol table. */
tabinit ();
+ /* Construct the axiom symbol. */
+ axiom = getsym ("$axiom");
+ axiom->class = nterm_sym;
+ axiom->value = nvars++;
+
/* Construct the error token */
errtoken = getsym ("error");
errtoken->class = token_sym;
TABLE_OBSTACK and FDEFINES file. Also notice any %token, %left,
etc. found there. */
read_declarations ();
+
+ /* If the user did not define her EOFTOKEN, do it now. */
+ if (!eoftoken)
+ {
+ eoftoken = getsym ("$");
+ eoftoken->class = token_sym;
+ /* Value specified by POSIX. */
+ eoftoken->user_token_number = 0;
+ }
+
/* Read in the grammar, build grammar in list form. Write out
guards and actions. */
readgram ();
projects / bison.git / blobdiff