X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d33cb3ae09c2bed6df2ef950f5aa14ceba428d8b..95f22ad2a777be59535616142910f8914dac6f26:/src/state.h diff --git a/src/state.h b/src/state.h index 830d4578..36395d16 100644 --- a/src/state.h +++ b/src/state.h @@ -1,5 +1,7 @@ -/* Type definitions for nondeterministic finite state machine for bison, - Copyright 1984, 1989, 2000, 2001 Free Software Foundation, Inc. +/* Type definitions for nondeterministic finite state machine for Bison. + + Copyright (C) 1984, 1989, 2000, 2001, 2002, 2003, 2004 Free + Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -44,14 +46,14 @@ 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. - The two types of actions are shifts/gotos (push the lookahead token + The two types of actions are shifts/gotos (push the look-ahead token and read another/goto to the state designated by a nterm) and reductions (combine the last n things on the stack via a rule, replace them with the symbol that the rule derives, and leave the - lookahead token alone). When the states are generated, these + look-ahead token alone). When the states are generated, these actions are represented in two other lists. - Each transition_t structure describes the possible transitions out + Each transition structure describes the possible transitions out of one state, the state whose number is in the number field. Each contains a vector of numbers of the states that transitions can go to. The accessing_symbol fields of those states' cores say what @@ -82,31 +84,38 @@ #ifndef STATE_H_ # define STATE_H_ -# include "bitset.h" +# include + +# include "gram.h" +# include "symtab.h" /*-------------------. | Numbering states. | `-------------------*/ -typedef short state_number_t; -# define STATE_NUMBER_MAX ((state_number_t) SHRT_MAX) +typedef int state_number; +# define STATE_NUMBER_MAXIMUM INT_MAX -/* Be ready to map a state_number_t to an int. */ -# define state_number_as_int(Tok) ((int) (Tok)) +/* Be ready to map a state_number to an int. */ +static inline int +state_number_as_int (state_number s) +{ + return s; +} -typedef struct state_s state_t; +typedef struct state state; /*--------------. | Transitions. | `--------------*/ -typedef struct transtion_s +typedef struct { - short num; - state_t *states[1]; -} transitions_t; + int num; + state *states[1]; +} transitions; /* What is the symbol labelling the transition to @@ -151,51 +160,50 @@ typedef struct transtion_s if (!TRANSITION_IS_DISABLED (Transitions, Iter)) -/* Return the state such these TRANSITIONS contain a shift/goto to it on - SYMBOL. Aborts if none found. */ -struct state_s; -struct state_s *transitions_to (transitions_t *state, symbol_number_t 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 sym); /*-------. | Errs. | `-------*/ -typedef struct errs_s +typedef struct { - short num; - symbol_t *symbols[1]; -} errs_t; + int num; + symbol *symbols[1]; +} errs; -errs_t *errs_new (int num, symbol_t **tokens); +errs *errs_new (int num, symbol **tokens); /*-------------. | Reductions. | `-------------*/ -typedef struct reductions_s +typedef struct { - short num; - bitset *lookaheads; - rule_t *rules[1]; -} reductions_t; + int num; + bitset *look_ahead_tokens; + rule *rules[1]; +} reductions; /*---------. -| States. | +| states. | `---------*/ -struct state_s +struct state { - state_number_t number; - symbol_number_t accessing_symbol; - transitions_t *transitions; - reductions_t *reductions; - errs_t *errs; + state_number number; + symbol_number accessing_symbol; + transitions *transitions; + reductions *reductions; + errs *errs; - /* Nonzero if no lookahead is needed to decide what to do in state S. */ + /* Nonzero if no look-ahead is needed to decide what to do in state S. */ char consistent; /* If some conflicts were solved thanks to precedence/associativity, @@ -204,31 +212,31 @@ struct state_s /* Its items. Must be last, since ITEMS can be arbitrarily large. */ - unsigned short nitems; - item_number_t items[1]; + size_t nitems; + item_number items[1]; }; -extern state_number_t nstates; -extern state_t *final_state; +extern state_number nstates; +extern state *final_state; /* Create a new state with ACCESSING_SYMBOL for those items. */ -state_t *state_new (symbol_number_t accessing_symbol, - size_t core_size, item_number_t *core); +state *state_new (symbol_number accessing_symbol, + size_t core_size, item_number *core); /* Set the transitions of STATE. */ -void state_transitions_set (state_t *state, int num, state_t **transitions); +void state_transitions_set (state *s, int num, state **trans); /* Set the reductions of STATE. */ -void state_reductions_set (state_t *state, int num, rule_t **reductions); +void state_reductions_set (state *s, int num, rule **reds); -int state_reduction_find (state_t *state, rule_t *rule); +int state_reduction_find (state *s, rule *r); /* Set the errs of STATE. */ -void state_errs_set (state_t *state, int num, symbol_t **errs); +void state_errs_set (state *s, int num, symbol **errors); -/* Print on OUT all the lookaheads such that this STATE wants to - reduce this RULE. */ -void state_rule_lookaheads_print (state_t *state, rule_t *rule, FILE *out); +/* Print on OUT all the look-ahead tokens such that this STATE wants to + reduce R. */ +void state_rule_look_ahead_tokens_print (state *s, rule *r, FILE *out); /* Create/destroy the states hash table. */ void state_hash_new (void); @@ -236,13 +244,13 @@ void state_hash_free (void); /* Find the state associated to the CORE, and return it. If it does not exist yet, return NULL. */ -state_t *state_hash_lookup (size_t core_size, item_number_t *core); +state *state_hash_lookup (size_t core_size, item_number *core); /* Insert STATE in the state hash table. */ -void state_hash_insert (state_t *state); +void state_hash_insert (state *s); /* All the states, indexed by the state number. */ -extern state_t **states; +extern state **states; /* Free all the states. */ void states_free (void);