Finish implementing %define lr.type.

Its value can be "LALR", "IELR", or "canonical LR".
* lib/timevar.def (TV_IELR_PHASE1): New var.
(TV_IELR_PHASE2): New var.
(TV_IELR_PHASE3): New var.
(TV_IELR_PHASE4): New var.
* src/local.mk (src_bison_SOURCES): Add AnnotationList.c,
AnnotationList.h, InadequacyList.c, InadequacyList.h, Sbitset.c,
Sbitset.h, ielr.c, and ielr.h.
* src/getargs.h, src/getargs.c (enum trace, trace_args,
trace_types): Add trace_ielr.
* src/lalr.h, src/lalr.c (ngotos): Export it.
(F): Rename to...
(goto_follows): ... this, update all uses, and export it.
(set_goto_map): Export it.
(map_goto): Export it.
(compute_lookahead_tokens): Don't free goto_follows yet.  Now
handled in ielr.
(initialize_LA): Export it.  Move lookback allocation to...
(lalr): ... here because, for canonical LR, initialize_LA must
be invoked but lookback and much of the rest of LALR isn't
needed.
* main.c (main): Instead of lalr, invoke ielr, which invokes
lalr.
* src/reader.c (reader): Default lr.type to "LALR".
Default lr.default_rules to "accepting" if lr.type is "canonical
LR".  Leave the default as "all" otherwise.
Check for a valid lr.type value.
* src/state.h, src/state.c (struct state_list): Add state_list
member.
(state_new): Initialize state_list member to NULL.
(state_new_isocore): New function, exported.
* tests/existing.at (AT_TEST_EXISTING_GRAMMAR): New macro that
exercises all values of lr.type.
(GNU AWK Grammar): Rename test group to...
(GNU AWK 3.1.0 Grammar): ... this, and extend to use
AT_TEST_EXISTING_GRAMMAR.
(GNU Cim Grammar): Extend to use AT_TEST_EXISTING_GRAMMAR.
(GNU pic Grammar): Rename test group to...
(GNU pic (Groff 1.18.1) Grammar): ... this, and extend to use
AT_TEST_EXISTING_GRAMMAR.
* tests/reduce.at (AT_TEST_LR_TYPE): New macro that exercises
all values of lr.type.
(Single State Split): New test groups using AT_TEST_LR_TYPE.
(Lane Split): Likewise.
(Complex Lane Split): Likewise.
(Split During Added Lookahead Propagation): Likewise.

src/lalr.h

@@ -1,7 +1,7 @@
 /* Compute lookahead criteria for bison,
 
-   Copyright (C) 1984, 1986, 1989, 2000, 2002, 2004, 2006, 2007 Free Software
-   Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 2000, 2002, 2004, 2006, 2007, 2009
+   Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -37,13 +37,29 @@
    which rules need lookahead in each state, and which lookahead
    tokens they accept.
 
-   Builds:
-   - #goto_map
-   - #from_state
-   - #to_state
+   Also builds:
+     - #goto_map
+     - #from_state
+     - #to_state
+     - #goto_follows
 */
 void lalr (void);
 
+/**
+ * Set #nLA and allocate all reduction lookahead sets.  Normally invoked by
+ * #lalr.
+ */
+void initialize_LA (void);
+
+/**
+ * Build only:
+ *   - #goto_map
+ *   - #from_state
+ *   - #to_state
+ * Normally invoked by #lalr.
+ */
+void set_goto_map (void);
+
 /**
  * Update state numbers recorded in #goto_map, #from_state, and #to_state such
  * that:
@@ -62,7 +78,6 @@ void lalr_update_state_numbers (state_number old_to_new[],
    Can be performed once the action tables are computed.  */
 void lalr_free (void);
 
-
 typedef size_t goto_number;
 # define GOTO_NUMBER_MAXIMUM ((goto_number) -1)
 
@@ -73,11 +88,20 @@ typedef size_t goto_number;
    TO_STATE of the first of them.  */
 extern goto_number *goto_map;
 
-/** State number which a transition leads from. */
+/** The size of #from_state and #to_state.  */
+extern goto_number ngotos;
+
+/** State number which a transition leads from.  */
 extern state_number *from_state;
 
 /** State number it leads to.  */
 extern state_number *to_state;
 
+/** Map a state/symbol pair into its numeric representation.  */
+goto_number map_goto (state_number s0, symbol_number sym);
+
+/* goto_follows[i] is the set of tokens following goto i.  */
+extern bitsetv goto_follows;
+
 
 #endif /* !LALR_H_ */