* src/gram.h (item_number_t): New, the type of item numbers in

[bison.git] / src / state.h

diff --git a/src/state.h b/src/state.h
index 37598cb0ff7642573057307a18b85549f9b74e4b..b4fa6b08972974ab7ba1ffd452ee81d0f9b73472 100644 (file)
--- a/src/state.h
+++ b/src/state.h
@@ -1,5 +1,5 @@
 /* Type definitions for nondeterministic finite state machine for bison,
 /* Type definitions for nondeterministic finite state machine for bison,

-   Copyright 1984, 1989, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1989, 2000, 2001 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -41,10 +41,10 @@
    the last thing accepted to reach that state.  It is the
    accessing_symbol of the core.
 
    the last thing accepted to reach that state.  It is the
    accessing_symbol of the core.
 

-   Each core contains a vector of nitems items which are the indices
+   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 ritems vector of the items that are selected in this state.
 

-   The link field is used for chaining buckets that hash states by
+   The link field is used for chaining symbols that hash states by

    their itemsets.  This is for recognizing equivalent states and
    combining them when the states are generated.
 
    their itemsets.  This is for recognizing equivalent states and
    combining them when the states are generated.
 


@@ -89,45 +89,30 @@
 # define STATE_H_
 
 
 # define STATE_H_
 
 

-/*-------.
-| Core.  |
-`-------*/
-
-typedef struct core
-{
-  struct core *next;
-  struct core *link;
-  short number;
-  short accessing_symbol;
-  short nitems;
-  short items[1];
-} core;
-
-#define CORE_ALLOC(Nitems)                                             \
-  (core *) xcalloc ((unsigned) (sizeof (core)                          \
-                                + (Nitems - 1) * sizeof (short)), 1)
-

 /*---------.
 | Shifts.  |
 `---------*/
 
 typedef struct shifts
 {
 /*---------.
 | Shifts.  |
 `---------*/
 
 typedef struct shifts
 {

-  struct shifts *next;
-  short number;

   short nshifts;
   short shifts[1];
 } shifts;
 
   short nshifts;
   short shifts[1];
 } shifts;
 

+shifts *shifts_new PARAMS ((int n));
+

 
 

-#define SHIFTS_ALLOC(Nshifts)                                          \
-  (shifts *) xcalloc ((unsigned) (sizeof (shifts)                      \
-                                  + (Nshifts - 1) * sizeof (short)), 1)
+/* What is the symbol which is shifted by SHIFTS->shifts[Shift]?  Can
+   be a token (amongst which the error token), or non terminals in
+   case of gotos.  */
+
+#define SHIFT_SYMBOL(Shifts, Shift) \
+  (states[Shifts->shifts[Shift]]->accessing_symbol)

 
 /* Is the SHIFTS->shifts[Shift] a real shift? (as opposed to gotos.) */
 
 #define SHIFT_IS_SHIFT(Shifts, Shift) \
 
 /* Is the SHIFTS->shifts[Shift] a real shift? (as opposed to gotos.) */
 
 #define SHIFT_IS_SHIFT(Shifts, Shift) \

-  (ISTOKEN (state_table[Shifts->shifts[Shift]].accessing_symbol))
+  (ISTOKEN (SHIFT_SYMBOL (Shifts, Shift)))

 
 /* Is the SHIFTS->shifts[Shift] a goto?. */
 
 
 /* Is the SHIFTS->shifts[Shift] a goto?. */
 


@@ -137,7 +122,16 @@ typedef struct shifts
 /* Is the SHIFTS->shifts[Shift] then handling of the error token?. */
 
 #define SHIFT_IS_ERROR(Shifts, Shift) \
 /* Is the SHIFTS->shifts[Shift] then handling of the error token?. */
 
 #define SHIFT_IS_ERROR(Shifts, Shift) \

-  (state_table[Shifts->shifts[Shift]].accessing_symbol == error_token_number)
+  (SHIFT_SYMBOL (Shifts, Shift) == error_token_number)
+
+/* When resolving a SR conflicts, if the reduction wins, the shift is
+   disabled.  */
+
+#define SHIFT_DISABLE(Shifts, Shift) \
+  (Shifts->shifts[Shift] = 0)
+
+#define SHIFT_IS_DISABLED(Shifts, Shift) \
+  (Shifts->shifts[Shift] == 0)

 
 
 /*-------.
 
 
 /*-------.


@@ -150,9 +144,8 @@ typedef struct errs
   short errs[1];
 } errs;
 
   short errs[1];
 } errs;
 

-#define ERRS_ALLOC(Nerrs)                                              \
-  (errs *) xcalloc ((unsigned) (sizeof (errs)                          \
-                                  + (Nerrs - 1) * sizeof (short)), 1)
+errs *errs_new PARAMS ((int n));
+errs *errs_dup PARAMS ((errs *src));

 
 
 /*-------------.
 
 
 /*-------------.


@@ -161,14 +154,43 @@ typedef struct errs
 
 typedef struct reductions
 {
 
 typedef struct reductions
 {

-  struct reductions *next;
-  short number;

   short nreds;
   short rules[1];
 } reductions;
 
   short nreds;
   short rules[1];
 } reductions;
 

-#define REDUCTIONS_ALLOC(Nreductions)                                  \
-  (reductions *) xcalloc ((unsigned) (sizeof (reductions)              \
-                                  + (Nreductions - 1) * sizeof (short)), 1)
+reductions *reductions_new PARAMS ((int n));
+
+
+/*----------.
+| State_t.  |
+`----------*/
+
+typedef struct state_s
+{
+  struct state_s *next;
+  struct state_s *link;
+
+  short number;
+  short accessing_symbol;
+  shifts     *shifts;
+  reductions *reductions;
+  errs       *errs;
+
+  /* Nonzero if no lookahead is needed to decide what to do in state S.  */
+  char consistent;
+
+  /* Used in LALR, not LR(0). */
+  /* Pseudo pointer into LA. */
+  short lookaheadsp;
+  int nlookaheads;
+
+  /* Its items. */
+  short nitems;
+  item_number_t items[1];
+} state_t;
+
+#define STATE_ALLOC(Nitems)                                            \
+  (state_t *) xcalloc ((unsigned) (sizeof (state_t)                    \
+                                  + (Nitems - 1) * sizeof (item_number_t)), 1)

 
 #endif /* !STATE_H_ */
 
 #endif /* !STATE_H_ */