+2002-07-31 Akim Demaille <akim@epita.fr>
+
+ Separate parser tables computation and output.
+
+ * src/output.c (nvectors, base_t, base, base_ninf, conflict_table)
+ (conflict_list, conflict_list_cnt, table, check, table_ninf)
+ (yydefgoto, yydefact, high): Move to...
+ * src/tables.h, src/tables.c: here.
+ * src/output.c (vector_number_t, VECTOR_NUMBER_MAX)
+ (VECTOR_NUMBER_MIN, state_number_to_vector_number)
+ (symbol_number_to_vector_number, nvectors, BASE_MAX, BASE_MIN)
+ (froms, tos, conflict_tos, tally, width, action_t, ACTION_MAX)
+ (ACTION_MIN, actrow, order, nentries, pos, conflrow)
+ (conflict_list_free, table_size, lowzero, table_grow, conflict_row)
+ (action_row, save_row, token_actions, save_column, default_goto)
+ (goto_actions, sort_actions, matching_state, pack_vector)
+ (table_ninf_remap, pack_table, prepare_actions): Move to...
+ * src/tables.c: here.
+ * src/tables.h, src/tables.c(tables_generate, tables_free): New.
+ * src/output.c (token_actions, output_base, output_conflicts)
+ (output_check): Merge into...
+ (prepare_actions): this.
+ (actions_output): Rename as...
+ (user_actions_output): this.
+ * src/main.c (main): Call tables_generate and tables_free.
+
2002-07-31 Akim Demaille <akim@epita.fr>
Steal GCC's --time-report support.
src/reader.c
src/reduce.c
src/scan-gram.c
+src/symlist.c
+src/symtab.c
+src/tables.c
+lib/argmatch.c
lib/error.c
lib/getopt.c
lib/obstack.c
symlist.c symlist.h \
symtab.c symtab.h \
system.h \
+ tables.h tables.c \
vcg.c vcg.h \
vcg_defaults.h
#include "files.h"
#include "complain.h"
#include "derives.h"
+#include "tables.h"
#include "output.h"
#include "reader.h"
#include "lalr.h"
timevar_pop (TV_GRAPH);
}
+ /* Compute the parser tables. */
+ timevar_push (TV_ACTIONS);
+ tables_generate ();
+ timevar_pop (TV_ACTIONS);
+
/* Output the tables and the parser to ftable. In file output. */
timevar_push (TV_PARSER);
output ();
timevar_pop (TV_PARSER);
timevar_push (TV_FREE);
+ tables_free ();
states_free ();
reduce_free ();
conflicts_free ();
negative short int. Used to flag ?? */
#include "system.h"
-#include "bitsetv.h"
#include "quotearg.h"
#include "error.h"
#include "getargs.h"
#include "files.h"
#include "gram.h"
-#include "LR0.h"
#include "complain.h"
#include "output.h"
-#include "lalr.h"
#include "reader.h"
#include "symtab.h"
-#include "conflicts.h"
+#include "tables.h"
#include "muscle_tab.h"
/* From src/scan-skel.l. */
void m4_invoke PARAMS ((const char *definitions));
-/* Several tables will be indexed both by state and nonterminal
- numbers. We call `vector' such a thing (= either a state or a
- symbol number.
-
- Of course vector_number_t ought to be wide enough to contain
- state_number_t and symbol_number_t. */
-typedef short vector_number_t;
-#define VECTOR_NUMBER_MAX ((vector_number_t) SHRT_MAX)
-#define VECTOR_NUMBER_MIN ((vector_number_t) SHRT_MIN)
-#define state_number_to_vector_number(State) \
- ((vector_number_t) State)
-#define symbol_number_to_vector_number(Symbol) \
- ((vector_number_t) (state_number_as_int (nstates) + Symbol - ntokens))
-
-static int nvectors;
-
-
-/* FROMS and TOS are indexed by vector_number_t.
-
- If VECTOR is a nonterminal, (FROMS[VECTOR], TOS[VECTOR]) form an
- array of state numbers of the non defaulted GOTO on VECTOR.
-
- If VECTOR is a state, TOS[VECTOR] is the array of actions to do on
- the (array of) symbols FROMS[VECTOR].
-
- In both cases, TALLY[VECTOR] is the size of the arrays
- FROMS[VECTOR], TOS[VECTOR]; and WIDTH[VECTOR] =
- (FROMS[VECTOR][SIZE] - FROMS[VECTOR][0] + 1) where SIZE =
- TALLY[VECTOR].
-
- FROMS therefore contains symbol_number_t and action_number_t,
- TOS state_number_t and action_number_t,
- TALLY sizes,
- WIDTH differences of FROMS.
-
- Let base_t be the type of FROMS, TOS, and WIDTH. */
-typedef int base_t;
-#define BASE_MAX ((base_t) INT_MAX)
-#define BASE_MIN ((base_t) INT_MIN)
-
-static base_t **froms = NULL;
-static base_t **tos = NULL;
-static unsigned int **conflict_tos = NULL;
-static short *tally = NULL;
-static base_t *width = NULL;
-
-
-/* For a given state, N = ACTROW[SYMBOL]:
-
- If N = 0, stands for `run the default action'.
- If N = MIN, stands for `raise a parse error'.
- If N > 0, stands for `shift SYMBOL and go to n'.
- If N < 0, stands for `reduce -N'. */
-typedef short action_t;
-#define ACTION_MAX ((action_t) SHRT_MAX)
-#define ACTION_MIN ((action_t) SHRT_MIN)
-
-static action_t *actrow = NULL;
-
-/* FROMS and TOS are reordered to be compressed. ORDER[VECTOR] is the
- new vector number of VECTOR. We skip `empty' vectors (i.e.,
- TALLY[VECTOR] = 0), and call these `entries'. */
-static vector_number_t *order = NULL;
-static int nentries;
-
-static base_t *base = NULL;
-/* A distinguished value of BASE, negative infinite. During the
- computation equals to BASE_MIN, later mapped to BASE_NINF to
- keep parser tables small. */
-base_t base_ninf = 0;
-static base_t *pos = NULL;
-
-static unsigned int *conflrow = NULL;
-static unsigned int *conflict_table = NULL;
-static unsigned int *conflict_list = NULL;
-static int conflict_list_cnt;
-static int conflict_list_free;
-
-/* TABLE_SIZE is the allocated size of both TABLE and CHECK. We start
- with more or less the original hard-coded value (which was
- SHRT_MAX). */
-static size_t table_size = 32768;
-static base_t *table = NULL;
-static base_t *check = NULL;
-/* The value used in TABLE to denote explicit parse errors
- (%nonassoc), a negative infinite. First defaults to ACTION_MIN,
- but in order to keep small tables, renumbered as TABLE_ERROR, which
- is the smallest (non error) value minus 1. */
-base_t table_ninf = 0;
-static int lowzero;
-static int high;
-
static struct obstack format_obstack;
int error_verbose = 0;
-/*----------------------------------------------------------------.
-| If TABLE (and CHECK) appear to be small to be addressed at |
-| DESIRED, grow them. Note that TABLE[DESIRED] is to be used, so |
-| the desired size is at least DESIRED + 1. |
-`----------------------------------------------------------------*/
-
-static void
-table_grow (size_t desired)
-{
- size_t old_size = table_size;
-
- while (table_size <= desired)
- table_size *= 2;
-
- if (trace_flag & trace_resource)
- fprintf (stderr, "growing table and check from: %d to %d\n",
- old_size, table_size);
-
- table = XREALLOC (table, base_t, table_size);
- check = XREALLOC (check, base_t, table_size);
- if (glr_parser)
- conflict_table = XREALLOC (conflict_table, unsigned int, table_size);
-
- for (/* Nothing. */; old_size < table_size; ++old_size)
- {
- table[old_size] = 0;
- check[old_size] = -1;
- }
-}
-
/*-------------------------------------------------------------------.
| Create a function NAME which associates to the muscle NAME the |
}
-/*-------------------------------------------------------------------.
-| For GLR parsers, for each conflicted token in STATE, as indicated |
-| by non-zero entries in CONFLROW, create a list of possible |
-| reductions that are alternatives to the shift or reduction |
-| currently recorded for that token in STATE. Store the alternative |
-| reductions followed by a 0 in CONFLICT_LIST, updating |
-| CONFLICT_LIST_CNT, and storing an index to the start of the list |
-| back into CONFLROW. |
-`-------------------------------------------------------------------*/
-
-static void
-conflict_row (state_t *state)
-{
- int i, j;
-
- if (! glr_parser)
- return;
-
- for (j = 0; j < ntokens; j += 1)
- if (conflrow[j])
- {
- conflrow[j] = conflict_list_cnt;
-
- /* Find all reductions for token J, and record all that do not
- match ACTROW[J]. */
- for (i = 0; i < state->nlookaheads; i += 1)
- if (bitset_test (state->lookaheads[i], j)
- && (actrow[j]
- != rule_number_as_item_number (state->lookaheads_rule[i]->number)))
- {
- assert (conflict_list_free > 0);
- conflict_list[conflict_list_cnt]
- = state->lookaheads_rule[i]->number + 1;
- conflict_list_cnt += 1;
- conflict_list_free -= 1;
- }
-
- /* Leave a 0 at the end. */
- assert (conflict_list_free > 0);
- conflict_list_cnt += 1;
- conflict_list_free -= 1;
- }
-}
-
-
-/*------------------------------------------------------------------.
-| Decide what to do for each type of token if seen as the lookahead |
-| token in specified state. The value returned is used as the |
-| default action (yydefact) for the state. In addition, ACTROW is |
-| filled with what to do for each kind of token, index by symbol |
-| number, with zero meaning do the default action. The value |
-| ACTION_MIN, a very negative number, means this situation is an |
-| error. The parser recognizes this value specially. |
-| |
-| This is where conflicts are resolved. The loop over lookahead |
-| rules considered lower-numbered rules last, and the last rule |
-| considered that likes a token gets to handle it. |
-| |
-| For GLR parsers, also sets CONFLROW[SYM] to an index into |
-| CONFLICT_LIST iff there is an unresolved conflict (s/r or r/r) |
-| with symbol SYM. The default reduction is not used for a symbol |
-| that has any such conflicts. |
-`------------------------------------------------------------------*/
-
-static rule_t *
-action_row (state_t *state)
-{
- int i;
- rule_t *default_rule = NULL;
- reductions_t *redp = state->reductions;
- transitions_t *transitions = state->transitions;
- errs_t *errp = state->errs;
- /* Set to nonzero to inhibit having any default reduction. */
- int nodefault = 0;
- int conflicted = 0;
-
- for (i = 0; i < ntokens; i++)
- actrow[i] = conflrow[i] = 0;
-
- if (redp->num >= 1)
- {
- int j;
- bitset_iterator biter;
- /* loop over all the rules available here which require
- lookahead */
- for (i = state->nlookaheads - 1; i >= 0; --i)
- /* and find each token which the rule finds acceptable
- to come next */
- BITSET_FOR_EACH (biter, state->lookaheads[i], j, 0)
- {
- /* and record this rule as the rule to use if that
- token follows. */
- if (actrow[j] != 0)
- conflicted = conflrow[j] = 1;
- actrow[j] = rule_number_as_item_number (state->lookaheads_rule[i]->number);
- }
- }
-
- /* Now see which tokens are allowed for shifts in this state. For
- them, record the shift as the thing to do. So shift is preferred
- to reduce. */
- FOR_EACH_SHIFT (transitions, i)
- {
- symbol_number_t symbol = TRANSITION_SYMBOL (transitions, i);
- state_t *shift_state = transitions->states[i];
-
- if (actrow[symbol] != 0)
- conflicted = conflrow[symbol] = 1;
- actrow[symbol] = state_number_as_int (shift_state->number);
-
- /* Do not use any default reduction if there is a shift for
- error */
- if (symbol == errtoken->number)
- nodefault = 1;
- }
-
- /* See which tokens are an explicit error in this state (due to
- %nonassoc). For them, record ACTION_MIN as the action. */
- for (i = 0; i < errp->num; i++)
- {
- symbol_t *symbol = errp->symbols[i];
- actrow[symbol->number] = ACTION_MIN;
- }
-
- /* Now find the most common reduction and make it the default action
- for this state. */
-
- if (redp->num >= 1 && !nodefault)
- {
- if (state->consistent)
- default_rule = redp->rules[0];
- else
- {
- int max = 0;
- for (i = 0; i < state->nlookaheads; i++)
- {
- int count = 0;
- rule_t *rule = state->lookaheads_rule[i];
- symbol_number_t j;
-
- for (j = 0; j < ntokens; j++)
- if (actrow[j] == rule_number_as_item_number (rule->number))
- count++;
-
- if (count > max)
- {
- max = count;
- default_rule = rule;
- }
- }
-
- /* GLR parsers need space for conflict lists, so we can't
- default conflicted entries. For non-conflicted entries
- or as long as we are not building a GLR parser,
- actions that match the default are replaced with zero,
- which means "use the default". */
-
- if (max > 0)
- {
- int j;
- for (j = 0; j < ntokens; j++)
- if (actrow[j] == rule_number_as_item_number (default_rule->number)
- && ! (glr_parser && conflrow[j]))
- actrow[j] = 0;
- }
- }
- }
-
- /* Find the rules which are reduced. */
- if (!glr_parser)
- {
- for (i = 0; i < ntokens; i++)
- if (actrow[i] < 0 && actrow[i] != ACTION_MIN)
- rules[item_number_as_rule_number (actrow[i])].useful = TRUE;
- if (default_rule)
- default_rule->useful = TRUE;
- }
-
- /* If have no default rule, the default is an error.
- So replace any action which says "error" with "use default". */
-
- if (!default_rule)
- for (i = 0; i < ntokens; i++)
- if (actrow[i] == ACTION_MIN)
- actrow[i] = 0;
-
- if (conflicted)
- conflict_row (state);
-
- return default_rule;
-}
-
-/*--------------------------------------------.
-| Set FROMS, TOS, TALLY and WIDTH for STATE. |
-`--------------------------------------------*/
+/*----------------------------------.
+| Output the user actions to OOUT. |
+`----------------------------------*/
static void
-save_row (state_number_t state)
-{
- symbol_number_t i;
- int count;
- base_t *sp = NULL;
- base_t *sp1 = NULL;
- base_t *sp2 = NULL;
- unsigned int *sp3 = NULL;
-
- /* Number of non default actions in STATE. */
- count = 0;
- for (i = 0; i < ntokens; i++)
- if (actrow[i] != 0)
- count++;
-
- if (count == 0)
- return;
-
- /* Allocate non defaulted actions. */
- froms[state] = sp1 = sp = XCALLOC (base_t, count);
- tos[state] = sp2 = XCALLOC (base_t, count);
- if (glr_parser)
- conflict_tos[state] = sp3 = XCALLOC (unsigned int, count);
- else
- conflict_tos[state] = NULL;
-
- /* Store non defaulted actions. */
- for (i = 0; i < ntokens; i++)
- if (actrow[i] != 0)
- {
- *sp1++ = i;
- *sp2++ = actrow[i];
- if (glr_parser)
- *sp3++ = conflrow[i];
- }
-
- tally[state] = count;
- width[state] = sp1[-1] - sp[0] + 1;
-}
-
-
-/*------------------------------------------------------------------.
-| Figure out the actions for the specified state, indexed by |
-| lookahead token type. |
-| |
-| The YYDEFACT table is output now. The detailed info is saved for |
-| putting into YYTABLE later. |
-`------------------------------------------------------------------*/
-
-static void
-token_actions (void)
-{
- state_number_t i;
- rule_number_t r;
- int nconflict = conflicts_total_count ();
-
- rule_number_t *yydefact = XCALLOC (rule_number_t, nstates);
-
- actrow = XCALLOC (action_t, ntokens);
- conflrow = XCALLOC (unsigned int, ntokens);
-
- /* Now that the parser was computed, we can find which rules are
- really reduced, and which are not because of SR or RR conflicts.
- */
- if (!glr_parser)
- for (r = 0; r < nrules; ++r)
- rules[r].useful = FALSE;
-
- if (glr_parser)
- {
- conflict_list = XCALLOC (unsigned int, 1 + 2 * nconflict);
- conflict_list_free = 2 * nconflict;
- conflict_list_cnt = 1;
- }
- else
- conflict_list_free = conflict_list_cnt = 0;
-
- for (i = 0; i < nstates; ++i)
- {
- rule_t *default_rule = action_row (states[i]);
- yydefact[i] = default_rule ? default_rule->number + 1 : 0;
- save_row (i);
- }
-
- muscle_insert_rule_number_table ("defact", yydefact,
- yydefact[0], 1, nstates);
-
- if (!glr_parser)
- for (r = 0; r < nrules ; ++r)
- if (!rules[r].useful)
- {
- LOCATION_PRINT (stderr, rules[r].location);
- fprintf (stderr, ": %s: %s: ",
- _("warning"), _("rule never reduced because of conflicts"));
- rule_print (&rules[r], stderr);
- }
-
- XFREE (actrow);
- XFREE (conflrow);
- XFREE (yydefact);
-}
-
-
-/*-----------------------------.
-| Output the actions to OOUT. |
-`-----------------------------*/
-
-void
-actions_output (FILE *out)
+user_actions_output (FILE *out)
{
rule_number_t r;
| Output the tokens definition to OOUT. |
`---------------------------------------*/
-void
+static void
token_definitions_output (FILE *out)
{
int i;
}
-/*------------------------------------------------------------------.
-| Compute FROMS[VECTOR], TOS[VECTOR], TALLY[VECTOR], WIDTH[VECTOR], |
-| i.e., the information related to non defaulted GOTO on the nterm |
-| SYMBOL. |
-| |
-| DEFAULT_STATE is the principal destination on SYMBOL, i.e., the |
-| default GOTO destination on SYMBOL. |
-`------------------------------------------------------------------*/
-
static void
-save_column (symbol_number_t symbol, state_number_t default_state)
-{
- int i;
- base_t *sp;
- base_t *sp1;
- base_t *sp2;
- int count;
- vector_number_t symno = symbol_number_to_vector_number (symbol);
-
- goto_number_t begin = goto_map[symbol];
- goto_number_t end = goto_map[symbol + 1];
-
- /* Number of non default GOTO. */
- count = 0;
- for (i = begin; i < end; i++)
- if (to_state[i] != default_state)
- count++;
-
- if (count == 0)
- return;
-
- /* Allocate room for non defaulted gotos. */
- froms[symno] = sp1 = sp = XCALLOC (base_t, count);
- tos[symno] = sp2 = XCALLOC (base_t, count);
-
- /* Store the state numbers of the non defaulted gotos. */
- for (i = begin; i < end; i++)
- if (to_state[i] != default_state)
- {
- *sp1++ = from_state[i];
- *sp2++ = to_state[i];
- }
-
- tally[symno] = count;
- width[symno] = sp1[-1] - sp[0] + 1;
-}
-
-
-/*----------------------------------------------------------------.
-| Return `the' most common destination GOTO on SYMBOL (a nterm). |
-`----------------------------------------------------------------*/
-
-static state_number_t
-default_goto (symbol_number_t symbol, short state_count[])
-{
- state_number_t s;
- int i;
- goto_number_t m = goto_map[symbol];
- goto_number_t n = goto_map[symbol + 1];
- state_number_t default_state = (state_number_t) -1;
- int max = 0;
-
- if (m == n)
- return (state_number_t) -1;
-
- for (s = 0; s < nstates; s++)
- state_count[s] = 0;
-
- for (i = m; i < n; i++)
- state_count[to_state[i]]++;
-
- for (s = 0; s < nstates; s++)
- if (state_count[s] > max)
- {
- max = state_count[s];
- default_state = s;
- }
-
- return default_state;
-}
-
-
-/*-------------------------------------------------------------------.
-| Figure out what to do after reducing with each rule, depending on |
-| the saved state from before the beginning of parsing the data that |
-| matched this rule. |
-| |
-| The YYDEFGOTO table is output now. The detailed info is saved for |
-| putting into YYTABLE later. |
-`-------------------------------------------------------------------*/
-
-static void
-goto_actions (void)
+prepare_actions (void)
{
- symbol_number_t i;
- state_number_t *yydefgoto = XMALLOC (state_number_t, nvars);
+ /* Figure out the actions for the specified state, indexed by
+ lookahead token type. */
- /* For a given nterm I, STATE_COUNT[S] is the number of times there
- is a GOTO to S on I. */
- short *state_count = XCALLOC (short, nstates);
- for (i = ntokens; i < nsyms; ++i)
- {
- state_number_t default_state = default_goto (i, state_count);
- save_column (i, default_state);
- yydefgoto[i - ntokens] = default_state;
- }
+ muscle_insert_rule_number_table ("defact", yydefact,
+ yydefact[0], 1, nstates);
+ /* Figure out what to do after reducing with each rule, depending on
+ the saved state from before the beginning of parsing the data
+ that matched this rule. */
muscle_insert_state_number_table ("defgoto", yydefgoto,
yydefgoto[0], 1, nsyms - ntokens);
- XFREE (state_count);
- XFREE (yydefgoto);
-}
-
-
-/*------------------------------------------------------------------.
-| Compute ORDER, a reordering of vectors, in order to decide how to |
-| pack the actions and gotos information into yytable. |
-`------------------------------------------------------------------*/
-
-static void
-sort_actions (void)
-{
- int i;
-
- nentries = 0;
-
- for (i = 0; i < nvectors; i++)
- if (tally[i] > 0)
- {
- int k;
- int t = tally[i];
- int w = width[i];
- int j = nentries - 1;
-
- while (j >= 0 && (width[order[j]] < w))
- j--;
-
- while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t))
- j--;
-
- for (k = nentries - 1; k > j; k--)
- order[k + 1] = order[k];
-
- order[j + 1] = i;
- nentries++;
- }
-}
-
-
-/* If VECTOR is a state which actions (reflected by FROMS, TOS, TALLY
- and WIDTH of VECTOR) are common to a previous state, return this
- state number.
-
- In any other case, return -1. */
-
-static state_number_t
-matching_state (vector_number_t vector)
-{
- vector_number_t i = order[vector];
- int t;
- int w;
- int prev;
-
- /* If VECTOR is a nterm, return -1. */
- if (i >= (int) nstates)
- return -1;
-
- t = tally[i];
- w = width[i];
-
- for (prev = vector - 1; prev >= 0; prev--)
- {
- vector_number_t j = order[prev];
- int k;
- int match = 1;
-
- /* Given how ORDER was computed, if the WIDTH or TALLY is
- different, there cannot be a matching state. */
- if (width[j] != w || tally[j] != t)
- return -1;
-
- for (k = 0; match && k < t; k++)
- if (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k])
- match = 0;
-
- if (match)
- return j;
- }
-
- return -1;
-}
-
-
-static base_t
-pack_vector (vector_number_t vector)
-{
- vector_number_t i = order[vector];
- int j;
- int t = tally[i];
- int loc = 0;
- base_t *from = froms[i];
- base_t *to = tos[i];
- unsigned int *conflict_to = conflict_tos[i];
-
- assert (t);
-
- for (j = lowzero - from[0]; j < (int) table_size; j++)
- {
- int k;
- int ok = 1;
-
- for (k = 0; ok && k < t; k++)
- {
- loc = j + state_number_as_int (from[k]);
- if (loc > (int) table_size)
- table_grow (loc);
-
- if (table[loc] != 0)
- ok = 0;
- }
-
- for (k = 0; ok && k < vector; k++)
- if (pos[k] == j)
- ok = 0;
-
- if (ok)
- {
- for (k = 0; k < t; k++)
- {
- loc = j + from[k];
- table[loc] = to[k];
- if (glr_parser && conflict_to != NULL)
- conflict_table[loc] = conflict_to[k];
- check[loc] = from[k];
- }
-
- while (table[lowzero] != 0)
- lowzero++;
-
- if (loc > high)
- high = loc;
-
- if (j < BASE_MIN || BASE_MAX < j)
- fatal ("base_t too small to hold %d\n", j);
- return j;
- }
- }
-#define pack_vector_succeeded 0
- assert (pack_vector_succeeded);
- return 0;
-}
-
-
-/*-------------------------------------------------------------.
-| Remap the negative infinite in TAB from NINF to the greatest |
-| possible smallest value. Return it. |
-| |
-| In most case this allows us to use shorts instead of ints in |
-| parsers. |
-`-------------------------------------------------------------*/
-
-static base_t
-table_ninf_remap (base_t tab[], size_t size, base_t ninf)
-{
- base_t res = 0;
- size_t i;
-
- for (i = 0; i < size; i++)
- if (tab[i] < res && tab[i] != ninf)
- res = base[i];
- --res;
- for (i = 0; i < size; i++)
- if (tab[i] == ninf)
- tab[i] = res;
-
- return res;
-}
-
-static void
-pack_table (void)
-{
- int i;
-
- base = XCALLOC (base_t, nvectors);
- pos = XCALLOC (base_t, nentries);
- table = XCALLOC (base_t, table_size);
- if (glr_parser)
- conflict_table = XCALLOC (unsigned int, table_size);
- check = XCALLOC (base_t, table_size);
-
- lowzero = 0;
- high = 0;
-
- for (i = 0; i < nvectors; i++)
- base[i] = BASE_MIN;
-
- for (i = 0; i < (int) table_size; i++)
- check[i] = -1;
-
- for (i = 0; i < nentries; i++)
- {
- state_number_t state = matching_state (i);
- base_t place;
-
- if (state < 0)
- /* A new set of state actions, or a nonterminal. */
- place = pack_vector (i);
- else
- /* Action of I were already coded for STATE. */
- place = base[state];
-
- pos[i] = place;
- base[order[i]] = place;
- }
-
- /* Use the greatest possible negative infinites. */
- base_ninf = table_ninf_remap (base, nvectors, BASE_MIN);
- table_ninf = table_ninf_remap (table, high + 1, ACTION_MIN);
-
- for (i = 0; i < nvectors; i++)
- {
- XFREE (froms[i]);
- XFREE (tos[i]);
- XFREE (conflict_tos[i]);
- }
-
- free (froms);
- free (tos);
- free (conflict_tos);
- free (pos);
-}
-
-
-/* the following functions output yytable, yycheck, yyconflp, yyconfl,
- and the vectors whose elements index the portion starts. */
-
-static void
-output_base (void)
-{
/* Output PACT. */
muscle_insert_base_table ("pact", base,
base[0], 1, nstates);
/* Output PGOTO. */
muscle_insert_base_table ("pgoto", base,
base[nstates], nstates + 1, nvectors);
- XFREE (base);
-}
-
-static void
-output_table (void)
-{
muscle_insert_base_table ("table", table,
table[0], 1, high + 1);
MUSCLE_INSERT_INT ("table_ninf", table_ninf);
- XFREE (table);
-}
-
-
-static void
-output_conflicts (void)
-{
- /* GLR parsing slightly modifies yytable and yycheck
- (and thus yypact) so that in states with unresolved conflicts,
- the default reduction is not used in the conflicted entries, so
- that there is a place to put a conflict pointer. This means that
- yyconflp and yyconfl are nonsense for a non-GLR parser, so we
- avoid accidents by not writing them out in that case. */
- if (! glr_parser)
- return;
-
- muscle_insert_unsigned_int_table ("conflict_list_heads", conflict_table,
- conflict_table[0], 1, high+1);
- muscle_insert_unsigned_int_table ("conflicting_rules", conflict_list,
- conflict_list[0], 1, conflict_list_cnt);
- XFREE (conflict_table);
- XFREE (conflict_list);
-}
-
-
-static void
-output_check (void)
-{
muscle_insert_base_table ("check", check,
check[0], 1, high + 1);
- XFREE (check);
-}
-
-/*-----------------------------------------------------------------.
-| Compute and output yydefact, yydefgoto, yypact, yypgoto, yytable |
-| and yycheck. |
-`-----------------------------------------------------------------*/
-
-static void
-prepare_actions (void)
-{
- /* That's a poor way to make sure the sizes are properly corelated,
- in particular the signedness is not taking into account, but it's
- not useless. */
- assert (sizeof (nvectors) >= sizeof (nstates));
- assert (sizeof (nvectors) >= sizeof (nvars));
-
- nvectors = state_number_as_int (nstates) + nvars;
-
- froms = XCALLOC (base_t *, nvectors);
- tos = XCALLOC (base_t *, nvectors);
- conflict_tos = XCALLOC (unsigned int *, nvectors);
- tally = XCALLOC (short, nvectors);
- width = XCALLOC (base_t, nvectors);
-
- token_actions ();
- bitsetv_free (LA);
- free (LArule);
-
- goto_actions ();
- XFREE (goto_map + ntokens);
- XFREE (from_state);
- XFREE (to_state);
-
- order = XCALLOC (vector_number_t, nvectors);
- sort_actions ();
- pack_table ();
- free (order);
-
- free (tally);
- free (width);
-
- output_base ();
- output_table ();
- output_conflicts ();
-
- output_check ();
+ if (glr_parser)
+ {
+ /* GLR parsing slightly modifies yytable and yycheck
+ (and thus yypact) so that in states with unresolved conflicts,
+ the default reduction is not used in the conflicted entries, so
+ that there is a place to put a conflict pointer. This means that
+ yyconflp and yyconfl are nonsense for a non-GLR parser, so we
+ avoid accidents by not writing them out in that case. */
+ muscle_insert_unsigned_int_table ("conflict_list_heads", conflict_table,
+ conflict_table[0], 1, high+1);
+ muscle_insert_unsigned_int_table ("conflicting_rules", conflict_list,
+ conflict_list[0], 1, conflict_list_cnt);
+ }
}
\f
fputs ("m4_changecom()\n", out);
fputs ("m4_init()\n", out);
- actions_output (out);
+ user_actions_output (out);
merger_output (out);
token_definitions_output (out);
symbol_destructors_output (out);
prepare_tokens ();
prepare_rules ();
prepare_states ();
- timevar_push (TV_ACTIONS);
prepare_actions ();
- timevar_pop (TV_ACTIONS);
prepare ();
/* Output the parsing tables and the parser code to FTABLE. */
void output PARAMS ((void));
-void actions_output PARAMS ((FILE *out));
-void token_definitions_output PARAMS ((FILE *out));
-
#endif /* !OUTPUT_H_ */
sprintf (full_skeleton, "%s%s", bison_pkgdatadir, skeleton);
else
sprintf (full_skeleton, "%s/%s", bison_pkgdatadir, skeleton);
- if (trace_flag)
+ if (trace_flag & trace_tools)
fprintf (stderr,
"running: %s -I %s m4sugar/m4sugar.m4 %s %s\n",
m4, bison_pkgdatadir, definitions, full_skeleton);
--- /dev/null
+/* Output the generated parsing program for bison,
+ Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002
+ 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 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.
+
+ Bison 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. */
+
+
+/* The parser tables consist of these tables.
+
+ YYTRANSLATE = vector mapping yylex's token numbers into bison's
+ token numbers.
+
+ YYTNAME = vector of string-names indexed by bison token number.
+
+ YYTOKNUM = vector of yylex token numbers corresponding to entries
+ in YYTNAME.
+
+ YYRLINE = vector of line-numbers of all rules. For yydebug
+ printouts.
+
+ YYRHS = vector of items of all rules. This is exactly what RITEMS
+ contains. For yydebug and for semantic parser.
+
+ YYPRHS[R] = index in YYRHS of first item for rule R.
+
+ YYR1[R] = symbol number of symbol that rule R derives.
+
+ YYR2[R] = number of symbols composing right hand side of rule R.
+
+ YYSTOS[S] = the symbol number of the symbol that leads to state S.
+
+ YYDEFACT[S] = default rule to reduce with in state s, when YYTABLE
+ doesn't specify something else to do. Zero means the default is an
+ error.
+
+ YYDEFGOTO[I] = default state to go to after a reduction of a rule
+ that generates variable NTOKENS + I, except when YYTABLE specifies
+ something else to do.
+
+ YYPACT[S] = index in YYTABLE of the portion describing state S.
+ The lookahead token's type is used to index that portion to find
+ out what to do.
+
+ If the value in YYTABLE is positive, we shift the token and go to
+ that state.
+
+ If the value is negative, it is minus a rule number to reduce by.
+
+ If the value is zero, the default action from YYDEFACT[S] is used.
+
+ YYPGOTO[I] = the index in YYTABLE of the portion describing what to
+ do after reducing a rule that derives variable I + NTOKENS. This
+ portion is indexed by the parser state number, S, as of before the
+ text for this nonterminal was read. The value from YYTABLE is the
+ state to go to if the corresponding value in YYCHECK is S.
+
+ YYTABLE = a vector filled with portions for different uses, found
+ via YYPACT and YYPGOTO.
+
+ YYCHECK = a vector indexed in parallel with YYTABLE. It indicates,
+ in a roundabout way, the bounds of the portion you are trying to
+ examine.
+
+ Suppose that the portion of YYTABLE starts at index P and the index
+ to be examined within the portion is I. Then if YYCHECK[P+I] != I,
+ I is outside the bounds of what is actually allocated, and the
+ default (from YYDEFACT or YYDEFGOTO) should be used. Otherwise,
+ YYTABLE[P+I] should be used.
+
+ YYFINAL = the state number of the termination state. YYFLAG = most
+ negative short int. Used to flag ?? */
+
+#include "system.h"
+#include "bitsetv.h"
+#include "quotearg.h"
+#include "getargs.h"
+#include "files.h"
+#include "gram.h"
+#include "complain.h"
+#include "lalr.h"
+#include "reader.h"
+#include "symtab.h"
+#include "conflicts.h"
+#include "tables.h"
+
+/* Several tables will be indexed both by state and nonterminal
+ numbers. We call `vector' such a thing (= either a state or a
+ symbol number.
+
+ Of course vector_number_t ought to be wide enough to contain
+ state_number_t and symbol_number_t. */
+typedef short vector_number_t;
+#define VECTOR_NUMBER_MAX ((vector_number_t) SHRT_MAX)
+#define VECTOR_NUMBER_MIN ((vector_number_t) SHRT_MIN)
+#define state_number_to_vector_number(State) \
+ ((vector_number_t) State)
+#define symbol_number_to_vector_number(Symbol) \
+ ((vector_number_t) (state_number_as_int (nstates) + Symbol - ntokens))
+
+int nvectors;
+
+
+/* FROMS and TOS are indexed by vector_number_t.
+
+ If VECTOR is a nonterminal, (FROMS[VECTOR], TOS[VECTOR]) form an
+ array of state numbers of the non defaulted GOTO on VECTOR.
+
+ If VECTOR is a state, TOS[VECTOR] is the array of actions to do on
+ the (array of) symbols FROMS[VECTOR].
+
+ In both cases, TALLY[VECTOR] is the size of the arrays
+ FROMS[VECTOR], TOS[VECTOR]; and WIDTH[VECTOR] =
+ (FROMS[VECTOR][SIZE] - FROMS[VECTOR][0] + 1) where SIZE =
+ TALLY[VECTOR].
+
+ FROMS therefore contains symbol_number_t and action_number_t,
+ TOS state_number_t and action_number_t,
+ TALLY sizes,
+ WIDTH differences of FROMS.
+
+ Let base_t be the type of FROMS, TOS, and WIDTH. */
+#define BASE_MAX ((base_t) INT_MAX)
+#define BASE_MIN ((base_t) INT_MIN)
+
+static base_t **froms = NULL;
+static base_t **tos = NULL;
+static unsigned int **conflict_tos = NULL;
+static short *tally = NULL;
+static base_t *width = NULL;
+
+
+/* For a given state, N = ACTROW[SYMBOL]:
+
+ If N = 0, stands for `run the default action'.
+ If N = MIN, stands for `raise a parse error'.
+ If N > 0, stands for `shift SYMBOL and go to n'.
+ If N < 0, stands for `reduce -N'. */
+typedef short action_t;
+#define ACTION_MAX ((action_t) SHRT_MAX)
+#define ACTION_MIN ((action_t) SHRT_MIN)
+
+static action_t *actrow = NULL;
+
+/* FROMS and TOS are reordered to be compressed. ORDER[VECTOR] is the
+ new vector number of VECTOR. We skip `empty' vectors (i.e.,
+ TALLY[VECTOR] = 0), and call these `entries'. */
+static vector_number_t *order = NULL;
+static int nentries;
+
+base_t *base = NULL;
+/* A distinguished value of BASE, negative infinite. During the
+ computation equals to BASE_MIN, later mapped to BASE_NINF to
+ keep parser tables small. */
+base_t base_ninf = 0;
+static base_t *pos = NULL;
+
+static unsigned int *conflrow = NULL;
+unsigned int *conflict_table = NULL;
+unsigned int *conflict_list = NULL;
+int conflict_list_cnt;
+static int conflict_list_free;
+
+/* TABLE_SIZE is the allocated size of both TABLE and CHECK. We start
+ with more or less the original hard-coded value (which was
+ SHRT_MAX). */
+static size_t table_size = 32768;
+base_t *table = NULL;
+base_t *check = NULL;
+/* The value used in TABLE to denote explicit parse errors
+ (%nonassoc), a negative infinite. First defaults to ACTION_MIN,
+ but in order to keep small tables, renumbered as TABLE_ERROR, which
+ is the smallest (non error) value minus 1. */
+base_t table_ninf = 0;
+static int lowzero;
+int high;
+
+state_number_t *yydefgoto;
+rule_number_t *yydefact;
+
+/*----------------------------------------------------------------.
+| If TABLE (and CHECK) appear to be small to be addressed at |
+| DESIRED, grow them. Note that TABLE[DESIRED] is to be used, so |
+| the desired size is at least DESIRED + 1. |
+`----------------------------------------------------------------*/
+
+static void
+table_grow (size_t desired)
+{
+ size_t old_size = table_size;
+
+ while (table_size <= desired)
+ table_size *= 2;
+
+ if (trace_flag & trace_resource)
+ fprintf (stderr, "growing table and check from: %d to %d\n",
+ old_size, table_size);
+
+ table = XREALLOC (table, base_t, table_size);
+ check = XREALLOC (check, base_t, table_size);
+ if (glr_parser)
+ conflict_table = XREALLOC (conflict_table, unsigned int, table_size);
+
+ for (/* Nothing. */; old_size < table_size; ++old_size)
+ {
+ table[old_size] = 0;
+ check[old_size] = -1;
+ }
+}
+
+
+
+
+/*-------------------------------------------------------------------.
+| For GLR parsers, for each conflicted token in STATE, as indicated |
+| by non-zero entries in CONFLROW, create a list of possible |
+| reductions that are alternatives to the shift or reduction |
+| currently recorded for that token in STATE. Store the alternative |
+| reductions followed by a 0 in CONFLICT_LIST, updating |
+| CONFLICT_LIST_CNT, and storing an index to the start of the list |
+| back into CONFLROW. |
+`-------------------------------------------------------------------*/
+
+static void
+conflict_row (state_t *state)
+{
+ int i, j;
+
+ if (! glr_parser)
+ return;
+
+ for (j = 0; j < ntokens; j += 1)
+ if (conflrow[j])
+ {
+ conflrow[j] = conflict_list_cnt;
+
+ /* Find all reductions for token J, and record all that do not
+ match ACTROW[J]. */
+ for (i = 0; i < state->nlookaheads; i += 1)
+ if (bitset_test (state->lookaheads[i], j)
+ && (actrow[j]
+ != rule_number_as_item_number (state->lookaheads_rule[i]->number)))
+ {
+ assert (conflict_list_free > 0);
+ conflict_list[conflict_list_cnt]
+ = state->lookaheads_rule[i]->number + 1;
+ conflict_list_cnt += 1;
+ conflict_list_free -= 1;
+ }
+
+ /* Leave a 0 at the end. */
+ assert (conflict_list_free > 0);
+ conflict_list_cnt += 1;
+ conflict_list_free -= 1;
+ }
+}
+
+
+/*------------------------------------------------------------------.
+| Decide what to do for each type of token if seen as the lookahead |
+| token in specified state. The value returned is used as the |
+| default action (yydefact) for the state. In addition, ACTROW is |
+| filled with what to do for each kind of token, index by symbol |
+| number, with zero meaning do the default action. The value |
+| ACTION_MIN, a very negative number, means this situation is an |
+| error. The parser recognizes this value specially. |
+| |
+| This is where conflicts are resolved. The loop over lookahead |
+| rules considered lower-numbered rules last, and the last rule |
+| considered that likes a token gets to handle it. |
+| |
+| For GLR parsers, also sets CONFLROW[SYM] to an index into |
+| CONFLICT_LIST iff there is an unresolved conflict (s/r or r/r) |
+| with symbol SYM. The default reduction is not used for a symbol |
+| that has any such conflicts. |
+`------------------------------------------------------------------*/
+
+static rule_t *
+action_row (state_t *state)
+{
+ int i;
+ rule_t *default_rule = NULL;
+ reductions_t *redp = state->reductions;
+ transitions_t *transitions = state->transitions;
+ errs_t *errp = state->errs;
+ /* Set to nonzero to inhibit having any default reduction. */
+ int nodefault = 0;
+ int conflicted = 0;
+
+ for (i = 0; i < ntokens; i++)
+ actrow[i] = conflrow[i] = 0;
+
+ if (redp->num >= 1)
+ {
+ int j;
+ bitset_iterator biter;
+ /* loop over all the rules available here which require
+ lookahead */
+ for (i = state->nlookaheads - 1; i >= 0; --i)
+ /* and find each token which the rule finds acceptable
+ to come next */
+ BITSET_FOR_EACH (biter, state->lookaheads[i], j, 0)
+ {
+ /* and record this rule as the rule to use if that
+ token follows. */
+ if (actrow[j] != 0)
+ conflicted = conflrow[j] = 1;
+ actrow[j] = rule_number_as_item_number (state->lookaheads_rule[i]->number);
+ }
+ }
+
+ /* Now see which tokens are allowed for shifts in this state. For
+ them, record the shift as the thing to do. So shift is preferred
+ to reduce. */
+ FOR_EACH_SHIFT (transitions, i)
+ {
+ symbol_number_t symbol = TRANSITION_SYMBOL (transitions, i);
+ state_t *shift_state = transitions->states[i];
+
+ if (actrow[symbol] != 0)
+ conflicted = conflrow[symbol] = 1;
+ actrow[symbol] = state_number_as_int (shift_state->number);
+
+ /* Do not use any default reduction if there is a shift for
+ error */
+ if (symbol == errtoken->number)
+ nodefault = 1;
+ }
+
+ /* See which tokens are an explicit error in this state (due to
+ %nonassoc). For them, record ACTION_MIN as the action. */
+ for (i = 0; i < errp->num; i++)
+ {
+ symbol_t *symbol = errp->symbols[i];
+ actrow[symbol->number] = ACTION_MIN;
+ }
+
+ /* Now find the most common reduction and make it the default action
+ for this state. */
+
+ if (redp->num >= 1 && !nodefault)
+ {
+ if (state->consistent)
+ default_rule = redp->rules[0];
+ else
+ {
+ int max = 0;
+ for (i = 0; i < state->nlookaheads; i++)
+ {
+ int count = 0;
+ rule_t *rule = state->lookaheads_rule[i];
+ symbol_number_t j;
+
+ for (j = 0; j < ntokens; j++)
+ if (actrow[j] == rule_number_as_item_number (rule->number))
+ count++;
+
+ if (count > max)
+ {
+ max = count;
+ default_rule = rule;
+ }
+ }
+
+ /* GLR parsers need space for conflict lists, so we can't
+ default conflicted entries. For non-conflicted entries
+ or as long as we are not building a GLR parser,
+ actions that match the default are replaced with zero,
+ which means "use the default". */
+
+ if (max > 0)
+ {
+ int j;
+ for (j = 0; j < ntokens; j++)
+ if (actrow[j] == rule_number_as_item_number (default_rule->number)
+ && ! (glr_parser && conflrow[j]))
+ actrow[j] = 0;
+ }
+ }
+ }
+
+ /* Find the rules which are reduced. */
+ if (!glr_parser)
+ {
+ for (i = 0; i < ntokens; i++)
+ if (actrow[i] < 0 && actrow[i] != ACTION_MIN)
+ rules[item_number_as_rule_number (actrow[i])].useful = TRUE;
+ if (default_rule)
+ default_rule->useful = TRUE;
+ }
+
+ /* If have no default rule, the default is an error.
+ So replace any action which says "error" with "use default". */
+
+ if (!default_rule)
+ for (i = 0; i < ntokens; i++)
+ if (actrow[i] == ACTION_MIN)
+ actrow[i] = 0;
+
+ if (conflicted)
+ conflict_row (state);
+
+ return default_rule;
+}
+
+
+/*--------------------------------------------.
+| Set FROMS, TOS, TALLY and WIDTH for STATE. |
+`--------------------------------------------*/
+
+static void
+save_row (state_number_t state)
+{
+ symbol_number_t i;
+ int count;
+ base_t *sp = NULL;
+ base_t *sp1 = NULL;
+ base_t *sp2 = NULL;
+ unsigned int *sp3 = NULL;
+
+ /* Number of non default actions in STATE. */
+ count = 0;
+ for (i = 0; i < ntokens; i++)
+ if (actrow[i] != 0)
+ count++;
+
+ if (count == 0)
+ return;
+
+ /* Allocate non defaulted actions. */
+ froms[state] = sp1 = sp = XCALLOC (base_t, count);
+ tos[state] = sp2 = XCALLOC (base_t, count);
+ if (glr_parser)
+ conflict_tos[state] = sp3 = XCALLOC (unsigned int, count);
+ else
+ conflict_tos[state] = NULL;
+
+ /* Store non defaulted actions. */
+ for (i = 0; i < ntokens; i++)
+ if (actrow[i] != 0)
+ {
+ *sp1++ = i;
+ *sp2++ = actrow[i];
+ if (glr_parser)
+ *sp3++ = conflrow[i];
+ }
+
+ tally[state] = count;
+ width[state] = sp1[-1] - sp[0] + 1;
+}
+
+
+/*------------------------------------------------------------------.
+| Figure out the actions for the specified state, indexed by |
+| lookahead token type. |
+| |
+| The YYDEFACT table is output now. The detailed info is saved for |
+| putting into YYTABLE later. |
+`------------------------------------------------------------------*/
+
+static void
+token_actions (void)
+{
+ state_number_t i;
+ rule_number_t r;
+ int nconflict = conflicts_total_count ();
+
+ yydefact = XCALLOC (rule_number_t, nstates);
+
+ actrow = XCALLOC (action_t, ntokens);
+ conflrow = XCALLOC (unsigned int, ntokens);
+
+ /* Now that the parser was computed, we can find which rules are
+ really reduced, and which are not because of SR or RR conflicts.
+ */
+ if (!glr_parser)
+ for (r = 0; r < nrules; ++r)
+ rules[r].useful = FALSE;
+
+ if (glr_parser)
+ {
+ conflict_list = XCALLOC (unsigned int, 1 + 2 * nconflict);
+ conflict_list_free = 2 * nconflict;
+ conflict_list_cnt = 1;
+ }
+ else
+ conflict_list_free = conflict_list_cnt = 0;
+
+ for (i = 0; i < nstates; ++i)
+ {
+ rule_t *default_rule = action_row (states[i]);
+ yydefact[i] = default_rule ? default_rule->number + 1 : 0;
+ save_row (i);
+ }
+
+ if (!glr_parser)
+ for (r = 0; r < nrules ; ++r)
+ if (!rules[r].useful)
+ {
+ LOCATION_PRINT (stderr, rules[r].location);
+ fprintf (stderr, ": %s: %s: ",
+ _("warning"), _("rule never reduced because of conflicts"));
+ rule_print (&rules[r], stderr);
+ }
+
+ free (actrow);
+ free (conflrow);
+}
+
+
+/*------------------------------------------------------------------.
+| Compute FROMS[VECTOR], TOS[VECTOR], TALLY[VECTOR], WIDTH[VECTOR], |
+| i.e., the information related to non defaulted GOTO on the nterm |
+| SYMBOL. |
+| |
+| DEFAULT_STATE is the principal destination on SYMBOL, i.e., the |
+| default GOTO destination on SYMBOL. |
+`------------------------------------------------------------------*/
+
+static void
+save_column (symbol_number_t symbol, state_number_t default_state)
+{
+ int i;
+ base_t *sp;
+ base_t *sp1;
+ base_t *sp2;
+ int count;
+ vector_number_t symno = symbol_number_to_vector_number (symbol);
+
+ goto_number_t begin = goto_map[symbol];
+ goto_number_t end = goto_map[symbol + 1];
+
+ /* Number of non default GOTO. */
+ count = 0;
+ for (i = begin; i < end; i++)
+ if (to_state[i] != default_state)
+ count++;
+
+ if (count == 0)
+ return;
+
+ /* Allocate room for non defaulted gotos. */
+ froms[symno] = sp1 = sp = XCALLOC (base_t, count);
+ tos[symno] = sp2 = XCALLOC (base_t, count);
+
+ /* Store the state numbers of the non defaulted gotos. */
+ for (i = begin; i < end; i++)
+ if (to_state[i] != default_state)
+ {
+ *sp1++ = from_state[i];
+ *sp2++ = to_state[i];
+ }
+
+ tally[symno] = count;
+ width[symno] = sp1[-1] - sp[0] + 1;
+}
+
+
+/*----------------------------------------------------------------.
+| Return `the' most common destination GOTO on SYMBOL (a nterm). |
+`----------------------------------------------------------------*/
+
+static state_number_t
+default_goto (symbol_number_t symbol, short state_count[])
+{
+ state_number_t s;
+ int i;
+ goto_number_t m = goto_map[symbol];
+ goto_number_t n = goto_map[symbol + 1];
+ state_number_t default_state = (state_number_t) -1;
+ int max = 0;
+
+ if (m == n)
+ return (state_number_t) -1;
+
+ for (s = 0; s < nstates; s++)
+ state_count[s] = 0;
+
+ for (i = m; i < n; i++)
+ state_count[to_state[i]]++;
+
+ for (s = 0; s < nstates; s++)
+ if (state_count[s] > max)
+ {
+ max = state_count[s];
+ default_state = s;
+ }
+
+ return default_state;
+}
+
+
+/*-------------------------------------------------------------------.
+| Figure out what to do after reducing with each rule, depending on |
+| the saved state from before the beginning of parsing the data that |
+| matched this rule. |
+| |
+| The YYDEFGOTO table is output now. The detailed info is saved for |
+| putting into YYTABLE later. |
+`-------------------------------------------------------------------*/
+
+static void
+goto_actions (void)
+{
+ symbol_number_t i;
+ short *state_count = XCALLOC (short, nstates);
+ yydefgoto = XMALLOC (state_number_t, nvars);
+
+ /* For a given nterm I, STATE_COUNT[S] is the number of times there
+ is a GOTO to S on I. */
+ for (i = ntokens; i < nsyms; ++i)
+ {
+ state_number_t default_state = default_goto (i, state_count);
+ save_column (i, default_state);
+ yydefgoto[i - ntokens] = default_state;
+ }
+ free (state_count);
+}
+
+
+/*------------------------------------------------------------------.
+| Compute ORDER, a reordering of vectors, in order to decide how to |
+| pack the actions and gotos information into yytable. |
+`------------------------------------------------------------------*/
+
+static void
+sort_actions (void)
+{
+ int i;
+
+ nentries = 0;
+
+ for (i = 0; i < nvectors; i++)
+ if (tally[i] > 0)
+ {
+ int k;
+ int t = tally[i];
+ int w = width[i];
+ int j = nentries - 1;
+
+ while (j >= 0 && (width[order[j]] < w))
+ j--;
+
+ while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t))
+ j--;
+
+ for (k = nentries - 1; k > j; k--)
+ order[k + 1] = order[k];
+
+ order[j + 1] = i;
+ nentries++;
+ }
+}
+
+
+/* If VECTOR is a state which actions (reflected by FROMS, TOS, TALLY
+ and WIDTH of VECTOR) are common to a previous state, return this
+ state number.
+
+ In any other case, return -1. */
+
+static state_number_t
+matching_state (vector_number_t vector)
+{
+ vector_number_t i = order[vector];
+ int t;
+ int w;
+ int prev;
+
+ /* If VECTOR is a nterm, return -1. */
+ if (i >= (int) nstates)
+ return -1;
+
+ t = tally[i];
+ w = width[i];
+
+ for (prev = vector - 1; prev >= 0; prev--)
+ {
+ vector_number_t j = order[prev];
+ int k;
+ int match = 1;
+
+ /* Given how ORDER was computed, if the WIDTH or TALLY is
+ different, there cannot be a matching state. */
+ if (width[j] != w || tally[j] != t)
+ return -1;
+
+ for (k = 0; match && k < t; k++)
+ if (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k])
+ match = 0;
+
+ if (match)
+ return j;
+ }
+
+ return -1;
+}
+
+
+static base_t
+pack_vector (vector_number_t vector)
+{
+ vector_number_t i = order[vector];
+ int j;
+ int t = tally[i];
+ int loc = 0;
+ base_t *from = froms[i];
+ base_t *to = tos[i];
+ unsigned int *conflict_to = conflict_tos[i];
+
+ assert (t);
+
+ for (j = lowzero - from[0]; j < (int) table_size; j++)
+ {
+ int k;
+ int ok = 1;
+
+ for (k = 0; ok && k < t; k++)
+ {
+ loc = j + state_number_as_int (from[k]);
+ if (loc > (int) table_size)
+ table_grow (loc);
+
+ if (table[loc] != 0)
+ ok = 0;
+ }
+
+ for (k = 0; ok && k < vector; k++)
+ if (pos[k] == j)
+ ok = 0;
+
+ if (ok)
+ {
+ for (k = 0; k < t; k++)
+ {
+ loc = j + from[k];
+ table[loc] = to[k];
+ if (glr_parser && conflict_to != NULL)
+ conflict_table[loc] = conflict_to[k];
+ check[loc] = from[k];
+ }
+
+ while (table[lowzero] != 0)
+ lowzero++;
+
+ if (loc > high)
+ high = loc;
+
+ if (j < BASE_MIN || BASE_MAX < j)
+ fatal ("base_t too small to hold %d\n", j);
+ return j;
+ }
+ }
+#define pack_vector_succeeded 0
+ assert (pack_vector_succeeded);
+ return 0;
+}
+
+
+/*-------------------------------------------------------------.
+| Remap the negative infinite in TAB from NINF to the greatest |
+| possible smallest value. Return it. |
+| |
+| In most case this allows us to use shorts instead of ints in |
+| parsers. |
+`-------------------------------------------------------------*/
+
+static base_t
+table_ninf_remap (base_t tab[], size_t size, base_t ninf)
+{
+ base_t res = 0;
+ size_t i;
+
+ for (i = 0; i < size; i++)
+ if (tab[i] < res && tab[i] != ninf)
+ res = base[i];
+
+ --res;
+
+ for (i = 0; i < size; i++)
+ if (tab[i] == ninf)
+ tab[i] = res;
+
+ return res;
+}
+
+static void
+pack_table (void)
+{
+ int i;
+
+ base = XCALLOC (base_t, nvectors);
+ pos = XCALLOC (base_t, nentries);
+ table = XCALLOC (base_t, table_size);
+ if (glr_parser)
+ conflict_table = XCALLOC (unsigned int, table_size);
+ check = XCALLOC (base_t, table_size);
+
+ lowzero = 0;
+ high = 0;
+
+ for (i = 0; i < nvectors; i++)
+ base[i] = BASE_MIN;
+
+ for (i = 0; i < (int) table_size; i++)
+ check[i] = -1;
+
+ for (i = 0; i < nentries; i++)
+ {
+ state_number_t state = matching_state (i);
+ base_t place;
+
+ if (state < 0)
+ /* A new set of state actions, or a nonterminal. */
+ place = pack_vector (i);
+ else
+ /* Action of I were already coded for STATE. */
+ place = base[state];
+
+ pos[i] = place;
+ base[order[i]] = place;
+ }
+
+ /* Use the greatest possible negative infinites. */
+ base_ninf = table_ninf_remap (base, nvectors, BASE_MIN);
+ table_ninf = table_ninf_remap (table, high + 1, ACTION_MIN);
+
+ for (i = 0; i < nvectors; i++)
+ {
+ XFREE (froms[i]);
+ XFREE (tos[i]);
+ XFREE (conflict_tos[i]);
+ }
+
+ free (froms);
+ free (tos);
+ free (conflict_tos);
+ free (pos);
+}
+
+\f
+
+/*-----------------------------------------------------------------.
+| Compute and output yydefact, yydefgoto, yypact, yypgoto, yytable |
+| and yycheck. |
+`-----------------------------------------------------------------*/
+
+void
+tables_generate (void)
+{
+ /* That's a poor way to make sure the sizes are properly corelated,
+ in particular the signedness is not taking into account, but it's
+ not useless. */
+ assert (sizeof (nvectors) >= sizeof (nstates));
+ assert (sizeof (nvectors) >= sizeof (nvars));
+
+ nvectors = state_number_as_int (nstates) + nvars;
+
+ froms = XCALLOC (base_t *, nvectors);
+ tos = XCALLOC (base_t *, nvectors);
+ conflict_tos = XCALLOC (unsigned int *, nvectors);
+ tally = XCALLOC (short, nvectors);
+ width = XCALLOC (base_t, nvectors);
+
+ token_actions ();
+ bitsetv_free (LA);
+ free (LArule);
+
+ goto_actions ();
+ XFREE (goto_map + ntokens);
+ XFREE (from_state);
+ XFREE (to_state);
+
+ order = XCALLOC (vector_number_t, nvectors);
+ sort_actions ();
+ pack_table ();
+ free (order);
+
+ free (tally);
+ free (width);
+}
+
+
+/*-------------------------.
+| Free the parser tables. |
+`-------------------------*/
+
+void
+tables_free (void)
+{
+ free (base);
+ free (conflict_table);
+ free (conflict_list);
+ free (table);
+ free (check);
+ free (yydefgoto);
+ free (yydefact);
+}
--- /dev/null
+/* Prepare the LALR and GLR parser tables.
+ Copyright (C) 2002 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 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.
+
+ Bison 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. */
+
+#ifndef TABLES_H_
+# define TABLES_H_
+
+# include "state.h"
+
+extern int nvectors;
+
+typedef int base_t;
+extern base_t *base;
+/* A distinguished value of BASE, negative infinite. During the
+ computation equals to BASE_MIN, later mapped to BASE_NINF to
+ keep parser tables small. */
+extern base_t base_ninf;
+
+extern unsigned int *conflict_table;
+extern unsigned int *conflict_list;
+extern int conflict_list_cnt;
+
+extern base_t *table;
+extern base_t *check;
+/* The value used in TABLE to denote explicit parse errors
+ (%nonassoc), a negative infinite. */
+extern base_t table_ninf;
+
+extern state_number_t *yydefgoto;
+extern rule_number_t *yydefact;
+extern int high;
+
+void tables_generate PARAMS ((void));
+void tables_free PARAMS ((void));
+
+#endif /* !TABLES_H_ */
projects / bison.git / commitdiff
