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 "error.h"
+#include "subpipe.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;
+void scan_skel (FILE *);
+
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 |
GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number_t)
-/*-----------------------------------------------------------------.
-| Prepare the muscles related to the tokens: translate, tname, and |
-| toknum. |
-`-----------------------------------------------------------------*/
+/*------------------------------------------------------------------.
+| Prepare the muscles related to the symbols: translate, tname, and |
+| toknum. |
+`------------------------------------------------------------------*/
static void
-prepare_tokens (void)
+prepare_symbols (void)
{
+ MUSCLE_INSERT_INT ("tokens_number", ntokens);
+ MUSCLE_INSERT_INT ("nterms_number", nvars);
+ MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);
+ MUSCLE_INSERT_INT ("user_token_number_max", max_user_token_number);
+
muscle_insert_symbol_number_table ("translate",
token_translations,
token_translations[0],
1, max_user_token_number + 1);
+ /* tname -- token names. */
{
int i;
int j = 0;
muscle_insert_short_table ("dprec", dprec, 0, 0, nrules);
muscle_insert_short_table ("merger", merger, 0, 0, nrules);
+ MUSCLE_INSERT_INT ("rules_number", nrules);
+
free (rhs);
free (prhs);
free (rline);
values[i] = states[i]->accessing_symbol;
muscle_insert_symbol_number_table ("stos", values,
0, 1, nstates);
-}
-
-
-/*-------------------------------------------------------------------.
-| 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;
+ MUSCLE_INSERT_INT ("last", high);
+ MUSCLE_INSERT_INT ("final_state_number", final_state->number);
+ MUSCLE_INSERT_INT ("states_number", nstates);
}
-/*--------------------------------------------.
-| 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. |
-`------------------------------------------------------------------*/
+/*---------------------------------.
+| Output the user actions to OUT. |
+`---------------------------------*/
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;
fputs ("]])\n\n", out);
}
-/*---------------------------------------.
-| Output the tokens definition to OOUT. |
-`---------------------------------------*/
+/*--------------------------------------.
+| Output the tokens definition to OUT. |
+`--------------------------------------*/
-void
+static void
token_definitions_output (FILE *out)
{
int i;
}
-/*----------------------------------------.
-| Output the symbol destructors to OOUT. |
-`----------------------------------------*/
+/*---------------------------------------.
+| Output the symbol destructors to OUT. |
+`---------------------------------------*/
static void
symbol_destructors_output (FILE *out)
}
-/*-------------------------------------.
-| Output the symbol printers to OOUT. |
-`-------------------------------------*/
+/*------------------------------------.
+| Output the symbol printers to OUT. |
+`------------------------------------*/
static void
symbol_printers_output (FILE *out)
/* Filename, lineno,
Symbol-name, Symbol-number,
- destructor, typename. */
+ printer, typename. */
fprintf (out, "%s[[[%s]], [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]",
first ? "" : ",\n",
infile, symbol->printer_location.first_line,
}
-/*------------------------------------------------------------------.
-| 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. |
-`-----------------------------------------------------------------*/
+ /* 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.
-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 ();
+ This means that YYCONFLP and YYCONFL are nonsense for a non-GLR
+ parser, so we could avoid accidents by not writing them out in
+ that case. Nevertheless, it seems even better to be able to use
+ the GLR skeletons even without the non-deterministic tables. */
+ 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
static void
output_skeleton (void)
{
- /* Store the definition of all the muscles. */
- const char *tempdir = getenv ("TMPDIR");
- char *tempfile = NULL;
- FILE *out = NULL;
- int fd;
-
- if (tempdir == NULL)
- tempdir = DEFAULT_TMPDIR;
- tempfile = xmalloc (strlen (tempdir) + 11);
- sprintf (tempfile, "%s/bsnXXXXXX", tempdir);
- fd = mkstemp (tempfile);
- if (fd == -1)
- error (EXIT_FAILURE, errno, "%s", tempfile);
-
- out = fdopen (fd, "w");
- if (out == NULL)
- error (EXIT_FAILURE, errno, "%s", tempfile);
-
- /* There are no comments, especially not `#': we do want M4 expansion
- after `#': think of CPP macros! */
- fputs ("m4_changecom()\n", out);
+ FILE *in;
+ FILE *out;
+ int filter_fd[2];
+ char const *argv[7];
+ pid_t pid;
+
+ /* Compute the names of the package data dir and skeleton file.
+ Test whether m4sugar.m4 is readable, to check for proper
+ installation. A faulty installation can cause deadlock, so a
+ cheap sanity check is worthwhile. */
+ char const m4sugar[] = "m4sugar/m4sugar.m4";
+ char *full_path;
+ char const *p;
+ char const *m4 = (p = getenv ("M4")) ? p : M4;
+ char const *pkgdatadir = (p = getenv ("BISON_PKGDATADIR")) ? p : PKGDATADIR;
+ size_t skeleton_size = strlen (skeleton) + 1;
+ size_t pkgdatadirlen = strlen (pkgdatadir);
+ while (pkgdatadirlen && pkgdatadir[pkgdatadirlen - 1] == '/')
+ pkgdatadirlen--;
+ full_path = xmalloc (pkgdatadirlen + 1
+ + (skeleton_size < sizeof m4sugar
+ ? sizeof m4sugar : skeleton_size));
+ strcpy (full_path, pkgdatadir);
+ full_path[pkgdatadirlen] = '/';
+ strcpy (full_path + pkgdatadirlen + 1, m4sugar);
+ in = fopen (full_path, "r");
+ if (! in || fclose (in) != 0)
+ error (EXIT_FAILURE, errno, "%s", full_path);
+ strcpy (full_path + pkgdatadirlen + 1, skeleton);
+
+ /* Create an m4 subprocess connected to us via two pipes. */
+
+ if (trace_flag & trace_tools)
+ fprintf (stderr, "running: %s -I %s %s - %s\n",
+ m4, pkgdatadir, m4sugar, full_path);
+
+ argv[0] = m4;
+ argv[1] = "-I";
+ argv[2] = pkgdatadir;
+ argv[3] = m4sugar;
+ argv[4] = "-";
+ argv[5] = full_path;
+ argv[6] = NULL;
+
+ init_subpipe ();
+ pid = create_subpipe (argv, filter_fd);
+ free (full_path);
+
+ out = fdopen (filter_fd[0], "w");
+ if (! out)
+ error (EXIT_FAILURE, errno, "fdopen");
+
+ /* Output the definitions of all the muscles. */
fputs ("m4_init()\n", out);
- actions_output (out);
+ user_actions_output (out);
merger_output (out);
token_definitions_output (out);
symbol_destructors_output (out);
fputs ("m4_wrap([m4_divert_pop(0)])\n", out);
fputs ("m4_divert_push(0)dnl\n", out);
+ if (ferror (out))
+ error (EXIT_FAILURE, 0, "pipe output error");
xfclose (out);
- m4_invoke (tempfile);
-
- /* If `debugging', keep this file alive. */
- if (!(trace_flag & trace_tools))
- unlink (tempfile);
-
- free (tempfile);
+ /* Read and process m4's output. */
+ timevar_push (TV_M4);
+ in = fdopen (filter_fd[1], "r");
+ if (! in)
+ error (EXIT_FAILURE, errno, "fdopen");
+ scan_skel (in);
+ if (ferror (in))
+ error (EXIT_FAILURE, 0, "pipe input error");
+ xfclose (in);
+ reap_subpipe (pid, m4);
+ timevar_pop (TV_M4);
}
static void
MUSCLE_INSERT_STRING ("output_parser_name", parser_file_name);
MUSCLE_INSERT_STRING ("output_header_name", spec_defines_file);
- /* Symbols. */
- MUSCLE_INSERT_INT ("tokens_number", ntokens);
- MUSCLE_INSERT_INT ("nterms_number", nvars);
- MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);
- MUSCLE_INSERT_INT ("user_token_number_max", max_user_token_number);
-
- /* Rules. */
- MUSCLE_INSERT_INT ("rules_number", nrules);
-
- /* States. */
- MUSCLE_INSERT_INT ("last", high);
- MUSCLE_INSERT_INT ("final_state_number", final_state->number);
- MUSCLE_INSERT_INT ("states_number", nstates);
-
/* User Code. */
obstack_1grow (&pre_prologue_obstack, 0);
obstack_1grow (&post_prologue_obstack, 0);
}
/* Parse the skeleton file and output the needed parsers. */
- muscle_insert ("skeleton", skeleton);
+ MUSCLE_INSERT_STRING ("skeleton", skeleton);
}
{
obstack_init (&format_obstack);
- prepare_tokens ();
+ prepare_symbols ();
prepare_rules ();
prepare_states ();
prepare_actions ();
projects / bison.git / blobdiff