#include "getargs.h"
#include "files.h"
#include "symtab.h"
-#include "options.h"
+#include "symlist.h"
#include "gram.h"
#include "complain.h"
#include "output.h"
#include "muscle_tab.h"
int lineno;
-static symbol_list *grammar = NULL;
+static symbol_list_t *grammar = NULL;
static int start_flag = 0;
+merger_list *merge_functions;
/* Nonzero if %union has been seen. */
int typed = 0;
-
-static symbol_list *
-symbol_list_new (symbol_t *sym)
-{
- symbol_list *res = XMALLOC (symbol_list, 1);
- res->next = NULL;
- res->sym = sym;
- res->line = lineno;
- res->action = NULL;
- res->action_line = 0;
- res->ruleprec = NULL;
- return res;
-}
-
\f
-/*--------------------------------------------------------------.
-| Get the data type (alternative in the union) of the value for |
-| symbol N in rule RULE. |
-`--------------------------------------------------------------*/
-
-char *
-get_type_name (int n, symbol_list *rule)
-{
- int i;
- symbol_list *rp;
-
- if (n < 0)
- {
- complain (_("invalid $ value"));
- return NULL;
- }
-
- rp = rule;
- i = 0;
-
- while (i < n)
- {
- rp = rp->next;
- if (rp == NULL || rp->sym == NULL)
- {
- complain (_("invalid $ value"));
- return NULL;
- }
- ++i;
- }
-
- return rp->sym->type_name;
-}
-
-
/*-----------------------.
| Set the start symbol. |
`-----------------------*/
void
-grammar_start_symbol_set (symbol_t *s)
+grammar_start_symbol_set (symbol_t *s, location_t l)
{
if (start_flag)
- complain (_("multiple %s declarations"), "%start");
+ complain_at (l, _("multiple %s declarations"), "%start");
else
{
start_flag = 1;
startsymbol = s;
+ startsymbol_location = l;
}
}
\f
-/*-------------------------------------------------------------------.
-| Generate a dummy symbol, a nonterminal, whose name cannot conflict |
-| with the user's names. |
+ /*-------------------------------------------------------------------.
+| Return the merger index for a merging function named NAME, whose |
+| arguments have type TYPE. Records the function, if new, in |
+| merger_list. |
`-------------------------------------------------------------------*/
-static symbol_t *
-gensym (void)
+static int
+get_merge_function (const char* name, const char* type)
{
- /* Incremented for each generated symbol */
- static int gensym_count = 0;
- static char buf[256];
+ merger_list *syms;
+ merger_list head;
+ int n;
+
+ if (! glr_parser)
+ return 0;
+
+ if (type == NULL)
+ type = "";
+
+ head.next = merge_functions;
+ for (syms = &head, n = 1; syms->next != NULL; syms = syms->next, n += 1)
+ if (strcmp (name, syms->next->name) == 0)
+ break;
+ if (syms->next == NULL) {
+ syms->next = XMALLOC (merger_list, 1);
+ syms->next->name = strdup (name);
+ syms->next->type = strdup (type);
+ syms->next->next = NULL;
+ merge_functions = head.next;
+ } else if (strcmp (type, syms->next->type) != 0)
+ warn (_("result type clash on merge function %s: `%s' vs. `%s'"),
+ name, type, syms->next->type);
+ return n;
+}
- symbol_t *sym;
+/*--------------------------------------.
+| Free all merge-function definitions. |
+`--------------------------------------*/
- sprintf (buf, "@%d", ++gensym_count);
- sym = getsym (buf);
- sym->class = nterm_sym;
- sym->number = nvars++;
- return sym;
+void
+free_merger_functions (void)
+{
+ merger_list *L0;
+ if (! glr_parser)
+ return;
+ L0 = merge_functions;
+ while (L0 != NULL)
+ {
+ merger_list *L1 = L0->next;
+ free (L0);
+ L0 = L1;
+ }
}
+
\f
/*-------------------------------------------------------------------.
-| Parse the input grammar into a one symbol_list structure. Each |
+| Parse the input grammar into a one symbol_list_t structure. Each |
| rule is represented by a sequence of symbols: the left hand side |
| followed by the contents of the right hand side, followed by a |
| null pointer instead of a symbol to terminate the rule. The next |
`-------------------------------------------------------------------*/
/* The (currently) last symbol of GRAMMAR. */
-symbol_list *grammar_end = NULL;
+symbol_list_t *grammar_end = NULL;
/* Append S to the GRAMMAR. */
void
-grammar_symbol_append (symbol_t *s)
+grammar_symbol_append (symbol_t *symbol, location_t location)
{
- symbol_list *p = symbol_list_new (s);
+ symbol_list_t *p = symbol_list_new (symbol, location);
if (grammar_end)
grammar_end->next = p;
grammar_end = p;
}
-/* The rule currently being defined, and the previous rule. Point to
- the first symbol of each list: their lhs. */
-symbol_list *current_rule = NULL;
-symbol_list *previous_rule = NULL;
+/* The rule currently being defined, and the previous rule.
+ CURRENT_RULE points to the first LHS of the current rule, while
+ PREVIOUS_RULE_END points to the *end* of the previous rule (NULL). */
+symbol_list_t *current_rule = NULL;
+symbol_list_t *previous_rule_end = NULL;
-/* Create a new rule for LHS in to the GRAMMAR. */
+/*----------------------------------------------.
+| Create a new rule for LHS in to the GRAMMAR. |
+`----------------------------------------------*/
void
-grammar_rule_begin (symbol_t *lhs)
+grammar_rule_begin (symbol_t *lhs, location_t location)
{
if (!start_flag)
{
startsymbol = lhs;
+ startsymbol_location = location;
start_flag = 1;
}
++nrules;
++nritems;
- previous_rule = grammar_end;
- grammar_symbol_append (lhs);
+ previous_rule_end = grammar_end;
+ grammar_symbol_append (lhs, location);
current_rule = grammar_end;
/* Mark the rule's lhs as a nonterminal if not already so. */
++nvars;
}
else if (lhs->class == token_sym)
- complain (_("rule given for %s, which is a token"), lhs->tag);
+ complain_at (location, _("rule given for %s, which is a token"), lhs->tag);
}
/* Check that the last rule (CURRENT_RULE) is properly defined. For
const char *lhs_type = lhs->type_name ? lhs->type_name : "";
const char *rhs_type = first_rhs->type_name ? first_rhs->type_name : "";
if (strcmp (lhs_type, rhs_type))
- complain (_("type clash (`%s' `%s') on default action"),
- lhs_type, rhs_type);
+ complain_at (current_rule->location,
+ _("type clash (`%s' `%s') on default action"),
+ lhs_type, rhs_type);
}
/* Warn if there is no default for $$ but we need one. */
else
{
if (lhs->type_name)
- complain (_("empty rule for typed nonterminal, and no action"));
+ complain_at (current_rule->location,
+ _("empty rule for typed nonterminal, and no action"));
}
}
-/* End the currently being grown rule. */
+/*-------------------------------------.
+| End the currently being grown rule. |
+`-------------------------------------*/
void
-grammar_rule_end (void)
+grammar_rule_end (location_t location)
{
/* Put an empty link in the list to mark the end of this rule */
- grammar_symbol_append (NULL);
+ grammar_symbol_append (NULL, grammar_end->location);
+ current_rule->location = location;
grammar_current_rule_check ();
}
-/* The previous action turns out the be a mid-rule action. Attach it
- to the current rule, i.e., create a dummy symbol, attach it this
- mid-rule action, and append this dummy nonterminal to the current
- rule. */
+/*-------------------------------------------------------------------.
+| The previous action turns out the be a mid-rule action. Attach it |
+| to the current rule, i.e., create a dummy symbol, attach it this |
+| mid-rule action, and append this dummy nonterminal to the current |
+| rule. |
+`-------------------------------------------------------------------*/
void
grammar_midrule_action (void)
give the new rule this number by inserting the new rule before
it. */
- /* Make a dummy nonterminal, a gensym. */
- symbol_t *sdummy = gensym ();
- symbol_list *midrule_action = symbol_list_new (sdummy);
+ /* Make a DUMMY nonterminal, whose location is that of the midrule
+ action. Create the MIDRULE. */
+ location_t dummy_location = current_rule->action_location;
+ symbol_t *dummy = dummy_symbol_get (dummy_location);
+ symbol_list_t *midrule = symbol_list_new (dummy, dummy_location);
/* Make a new rule, whose body is empty, before the current one, so
that the action just read can belong to it. */
++nrules;
++nritems;
- /* Attach its lineno to that of the host rule. */
- midrule_action->line = current_rule->line;
- /* Move the action from the host rule to this one. */
- midrule_action->action = current_rule->action;
- midrule_action->action_line = current_rule->action_line;
+ /* Attach its location and actions to that of the DUMMY. */
+ midrule->location = dummy_location;
+ midrule->action = current_rule->action;
+ midrule->action_location = dummy_location;
current_rule->action = NULL;
- if (previous_rule)
- previous_rule->next = midrule_action;
+ if (previous_rule_end)
+ previous_rule_end->next = midrule;
else
- grammar = midrule_action;
+ grammar = midrule;
- /* End of the rule. */
- previous_rule = symbol_list_new (NULL);
- previous_rule->next = current_rule;
+ /* End the dummy's rule. */
+ previous_rule_end = symbol_list_new (NULL, dummy_location);
+ previous_rule_end->next = current_rule;
- midrule_action->next = previous_rule;
+ midrule->next = previous_rule_end;
- /* Insert the dummy generated by that rule into this rule. */
- ++nritems;
- grammar_symbol_append (sdummy);
+ /* Insert the dummy nonterminal replacing the midrule action into
+ the current rule. */
+ grammar_current_rule_symbol_append (dummy, dummy_location);
}
/* Set the precedence symbol of the current rule to PRECSYM. */
void
-grammar_current_rule_prec_set (symbol_t *precsym)
+grammar_current_rule_prec_set (symbol_t *precsym, location_t location)
{
if (current_rule->ruleprec)
- complain (_("two @prec's in a row"));
+ complain_at (location, _("two @prec's in a row"));
current_rule->ruleprec = precsym;
}
+/* Attach dynamic precedence DPREC to the current rule. */
+
+void
+grammar_current_rule_dprec_set (int dprec, location_t location)
+{
+ if (! glr_parser)
+ warn_at (location, _("%%dprec affects only GLR parsers"));
+ if (dprec <= 0)
+ complain_at (location, _("%%dprec must be followed by positive number"));
+ else if (current_rule->dprec != 0)
+ complain_at (location, _("only one %%dprec allowed per rule"));
+ current_rule->dprec = dprec;
+}
+
+/* Attach a merge function NAME with argument type TYPE to current
+ rule. */
+
+void
+grammar_current_rule_merge_set (const char* name, location_t location)
+{
+ if (! glr_parser)
+ warn_at (location, _("%%merge affects only GLR parsers"));
+ if (current_rule->merger != 0)
+ complain_at (location, _("only one %%merge allowed per rule"));
+ current_rule->merger =
+ get_merge_function (name, current_rule->sym->type_name);
+}
+
/* Attach a SYMBOL to the current rule. If needed, move the previous
action as a mid-rule action. */
void
-grammar_current_rule_symbol_append (symbol_t *symbol)
+grammar_current_rule_symbol_append (symbol_t *symbol, location_t location)
{
if (current_rule->action)
grammar_midrule_action ();
++nritems;
- grammar_symbol_append (symbol);
+ grammar_symbol_append (symbol, location);
}
-
/* Attach an ACTION to the current rule. If needed, move the previous
action as a mid-rule action. */
void
-grammar_current_rule_action_append (const char *action, int action_line)
+grammar_current_rule_action_append (const char *action, location_t location)
{
if (current_rule->action)
grammar_midrule_action ();
current_rule->action = action;
- current_rule->action_line = action_line;
+ current_rule->action_location = location;
}
\f
{
unsigned int itemno;
int ruleno;
- symbol_list *p;
+ symbol_list_t *p;
ritem = XCALLOC (item_number_t, nritems);
rules = XCALLOC (rule_t, nrules) - 1;
rules[ruleno].number = ruleno;
rules[ruleno].lhs = p->sym;
rules[ruleno].rhs = ritem + itemno;
- rules[ruleno].line = p->line;
+ rules[ruleno].location = p->location;
rules[ruleno].useful = TRUE;
rules[ruleno].action = p->action;
- rules[ruleno].action_line = p->action_line;
+ rules[ruleno].action_location = p->action_location;
+ rules[ruleno].dprec = p->dprec;
+ rules[ruleno].merger = p->merger;
p = p->next;
while (p && p->sym)
symbols_new ();
/* Construct the axiom symbol. */
- axiom = getsym ("$axiom");
+ axiom = symbol_get ("$axiom", empty_location);
axiom->class = nterm_sym;
axiom->number = nvars++;
/* Construct the error token */
- errtoken = getsym ("error");
+ errtoken = symbol_get ("error", empty_location);
errtoken->class = token_sym;
errtoken->number = ntokens++;
/* Construct a token that represents all undefined literal tokens.
It is always token number 2. */
- undeftoken = getsym ("$undefined.");
+ undeftoken = symbol_get ("$undefined.", empty_location);
undeftoken->class = token_sym;
undeftoken->number = ntokens++;
/* If the user did not define her EOFTOKEN, do it now. */
if (!eoftoken)
{
- eoftoken = getsym ("$");
+ eoftoken = symbol_get ("$", empty_location);
eoftoken->class = token_sym;
eoftoken->number = 0;
/* Value specified by POSIX. */
axiom: %start EOF. */
{
- symbol_list *p = symbol_list_new (axiom);
- p->line = grammar->line;
- p->next = symbol_list_new (startsymbol);
- p->next->next = symbol_list_new (eoftoken);
- p->next->next->next = symbol_list_new (NULL);
+ symbol_list_t *p = symbol_list_new (axiom, empty_location);
+ p->location = grammar->location;
+ p->next = symbol_list_new (startsymbol, empty_location);
+ p->next->next = symbol_list_new (eoftoken, empty_location);
+ p->next->next->next = symbol_list_new (NULL, empty_location);
p->next->next->next->next = grammar;
nrules += 1;
nritems += 3;
/* Convert the grammar into the format described in gram.h. */
packgram ();
- /* The grammar as a symbol_list is no longer needed. */
- LIST_FREE (symbol_list, grammar);
+ /* The grammar as a symbol_list_t is no longer needed. */
+ LIST_FREE (symbol_list_t, grammar);
}
projects / bison.git / blobdiff