* src/state.h, src/state.c (errs_new, errs_dup): New.

[bison.git] / src / state.h

diff --git a/src/state.h b/src/state.h
index f42425556490fcec2abe7f20a580e8a07a01fa65..14017afedec657d3f4b67b1c6bfc713c226d39c4 100644 (file)
--- a/src/state.h
+++ b/src/state.h
@@ -1,5 +1,5 @@
 /* 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.
 
@@ -88,46 +88,112 @@
 #ifndef STATE_H_
 # define STATE_H_
 
-typedef struct core
-{
-  struct core *next;
-  struct core *link;
-  short number;
-  short accessing_symbol;
-  short nitems;
-  short items[1];
-}
-core;
-
 
+/*---------.
+| Shifts.  |
+`---------*/
 
 typedef struct shifts
 {
-  struct shifts *next;
-  short number;
   short nshifts;
   short shifts[1];
-}
-shifts;
+} shifts;
+
+shifts *shifts_new PARAMS ((int n));
+
+
+/* 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) \
+  (state_table[Shifts->shifts[Shift]]->accessing_symbol)
+
+/* Is the SHIFTS->shifts[Shift] a real shift? (as opposed to gotos.) */
+
+#define SHIFT_IS_SHIFT(Shifts, Shift) \
+  (ISTOKEN (SHIFT_SYMBOL (Shifts, Shift)))
+
+/* Is the SHIFTS->shifts[Shift] a goto?. */
+
+#define SHIFT_IS_GOTO(Shifts, Shift) \
+  (!SHIFT_IS_SHIFT (Shifts, Shift))
+
+/* Is the SHIFTS->shifts[Shift] then handling of the error token?. */
+
+#define SHIFT_IS_ERROR(Shifts, Shift) \
+  (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)
 
 
+/*-------.
+| Errs.  |
+`-------*/
+
 typedef struct errs
 {
   short nerrs;
   short errs[1];
-}
-errs;
+} errs;
+
+errs *errs_new PARAMS ((int n));
+errs *errs_dup PARAMS ((errs *src));
 
 
+/*-------------.
+| Reductions.  |
+`-------------*/
 
 typedef struct reductions
 {
-  struct reductions *next;
-  short number;
   short nreds;
   short rules[1];
-}
-reductions;
+} reductions;
+
+#define REDUCTIONS_ALLOC(Nreductions)                                  \
+  (reductions *) xcalloc ((unsigned) (sizeof (reductions)              \
+                                  + (Nreductions - 1) * sizeof (short)), 1)
+
+
+
+/*----------.
+| 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;
+  short items[1];
+} state_t;
+
+#define STATE_ALLOC(Nitems)                                            \
+  (state_t *) xcalloc ((unsigned) (sizeof (state_t)                    \
+                                  + (Nitems - 1) * sizeof (short)), 1)
 
 #endif /* !STATE_H_ */