-/* Type definitions for nondeterministic finite state machine for Bison.
+/* Type definitions for the finite state machine for Bison.
- Copyright (C) 1984, 1989, 2000, 2001, 2002 Free Software
+ Copyright (C) 1984, 1989, 2000-2004, 2007, 2009-2013 Free Software
Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bison is distributed in the hope that it will be useful,
+ This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with Bison; see the file COPYING. If not, write to
- the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* These type definitions are used to represent a nondeterministic
ACCESSING_SYMBOL of the core.
Each core contains a vector of NITEMS items which are the indices
- in the RITEMS vector of the items that are selected in this state.
+ in the RITEM vector of the items that are selected in this state.
The two types of actions are shifts/gotos (push the lookahead token
and read another/goto to the state designated by a nterm) and
deletes transitions by having them point to zero.
Each reductions structure describes the possible reductions at the
- state whose number is in the number field. The data is a list of
- nreds rules, represented by their rule numbers. first_reduction
- points to the list of these structures.
+ state whose number is in the number field. rules is an array of
+ num rules. lookahead_tokens is an array of bitsets, one per rule.
Conflict resolution can decide that certain tokens in certain
states should explicitly be errors (for implementing %nonassoc).
| Numbering states. |
`-------------------*/
-typedef short state_number;
-# define STATE_NUMBER_MAXIMUM SHRT_MAX
+typedef int state_number;
+# define STATE_NUMBER_MAXIMUM INT_MAX
/* Be ready to map a state_number to an int. */
static inline int
typedef struct
{
- short num;
+ int num;
state *states[1];
} transitions;
TRANSITIONS->states[Num]? Can be a token (amongst which the error
token), or non terminals in case of gotos. */
-#define TRANSITION_SYMBOL(Transitions, Num) \
+# define TRANSITION_SYMBOL(Transitions, Num) \
(Transitions->states[Num]->accessing_symbol)
/* Is the TRANSITIONS->states[Num] a shift? (as opposed to gotos). */
-#define TRANSITION_IS_SHIFT(Transitions, Num) \
+# define TRANSITION_IS_SHIFT(Transitions, Num) \
(ISTOKEN (TRANSITION_SYMBOL (Transitions, Num)))
/* Is the TRANSITIONS->states[Num] a goto?. */
-#define TRANSITION_IS_GOTO(Transitions, Num) \
+# define TRANSITION_IS_GOTO(Transitions, Num) \
(!TRANSITION_IS_SHIFT (Transitions, Num))
/* Is the TRANSITIONS->states[Num] labelled by the error token? */
-#define TRANSITION_IS_ERROR(Transitions, Num) \
+# define TRANSITION_IS_ERROR(Transitions, Num) \
(TRANSITION_SYMBOL (Transitions, Num) == errtoken->number)
/* When resolving a SR conflicts, if the reduction wins, the shift is
disabled. */
-#define TRANSITION_DISABLE(Transitions, Num) \
+# define TRANSITION_DISABLE(Transitions, Num) \
(Transitions->states[Num] = NULL)
-#define TRANSITION_IS_DISABLED(Transitions, Num) \
+# define TRANSITION_IS_DISABLED(Transitions, Num) \
(Transitions->states[Num] == NULL)
/* Iterate over each transition over a token (shifts). */
-#define FOR_EACH_SHIFT(Transitions, Iter) \
- for (Iter = 0; \
- Iter < Transitions->num \
- && (TRANSITION_IS_DISABLED (Transitions, Iter) \
- || TRANSITION_IS_SHIFT (Transitions, Iter)); \
- ++Iter) \
+# define FOR_EACH_SHIFT(Transitions, Iter) \
+ for (Iter = 0; \
+ Iter < Transitions->num \
+ && (TRANSITION_IS_DISABLED (Transitions, Iter) \
+ || TRANSITION_IS_SHIFT (Transitions, Iter)); \
+ ++Iter) \
if (!TRANSITION_IS_DISABLED (Transitions, Iter))
-/* Return the state such SHIFTS contain a shift/goto to it on S.
+/* Return the state such SHIFTS contain a shift/goto to it on SYM.
Abort if none found. */
-struct state *transitions_to (transitions *shifts, symbol_number s);
+struct state *transitions_to (transitions *shifts, symbol_number sym);
/*-------.
typedef struct
{
- short num;
+ int num;
symbol *symbols[1];
} errs;
typedef struct
{
- short num;
- bitset *lookaheads;
+ int num;
+ bitset *lookahead_tokens;
+ /* Sorted ascendingly on rule number. */
rule *rules[1];
} reductions;
| states. |
`---------*/
+struct state_list;
+
struct state
{
state_number number;
reductions *reductions;
errs *errs;
- /* Nonzero if no lookahead is needed to decide what to do in state S. */
+ /* When an includer (such as ielr.c) needs to store states in a list, the
+ includer can define struct state_list as the list node structure and can
+ store in this member a reference to the node containing each state. */
+ struct state_list *state_list;
+
+ /* If non-zero, then no lookahead sets on reduce actions are needed to
+ decide what to do in state S. */
char consistent;
/* If some conflicts were solved thanks to precedence/associativity,
a human readable description of the resolution. */
const char *solved_conflicts;
+ const char *solved_conflicts_xml;
- /* Its items. Must be last, since ITEMS can be arbitrarily large.
- */
- unsigned short nitems;
+ /* Its items. Must be last, since ITEMS can be arbitrarily large. Sorted
+ ascendingly on item index in RITEM, which is sorted on rule number. */
+ size_t nitems;
item_number items[1];
};
/* Create a new state with ACCESSING_SYMBOL for those items. */
state *state_new (symbol_number accessing_symbol,
- size_t core_size, item_number *core);
+ size_t core_size, item_number *core);
+state *state_new_isocore (state const *s);
/* Set the transitions of STATE. */
void state_transitions_set (state *s, int num, state **trans);
/* Set the errs of STATE. */
void state_errs_set (state *s, int num, symbol **errors);
-/* Print on OUT all the lookaheads such that this STATE wants to
+/* Print on OUT all the lookahead tokens such that this STATE wants to
reduce R. */
-void state_rule_lookaheads_print (state *s, rule *r, FILE *out);
+void state_rule_lookahead_tokens_print (state *s, rule *r, FILE *out);
+void state_rule_lookahead_tokens_print_xml (state *s, rule *r,
+ FILE *out, int level);
/* Create/destroy the states hash table. */
void state_hash_new (void);
/* Insert STATE in the state hash table. */
void state_hash_insert (state *s);
+/* Remove unreachable states, renumber remaining states, update NSTATES, and
+ write to OLD_TO_NEW a mapping of old state numbers to new state numbers such
+ that the old value of NSTATES is written as the new state number for removed
+ states. The size of OLD_TO_NEW must be the old value of NSTATES. */
+void state_remove_unreachable_states (state_number old_to_new[]);
+
/* All the states, indexed by the state number. */
extern state **states;
/* Free all the states. */
void states_free (void);
+
#endif /* !STATE_H_ */
projects / bison.git / blobdiff