/* Output the generated parsing program for bison,
- Copyright 1984, 1986, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002
+ Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
02111-1307, USA. */
-/* The parser tables consist of these tables.
- Starred ones needed only for the semantic parser.
- Double starred are output only if switches are set.
-
- 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 ??
- YYNTBASE = ntokens.
-*/
-
#include "system.h"
-#include "obstack.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 "conflicts.h"
+#include "symtab.h"
+#include "tables.h"
#include "muscle_tab.h"
-extern void berror PARAMS((const char *));
-
-static int nvectors;
-static int nentries;
-static short **froms = NULL;
-static short **tos = NULL;
-static short *tally = NULL;
-static short *width = NULL;
-static short *actrow = NULL;
-static short *state_count = NULL;
-static short *order = NULL;
-static short *base = NULL;
-static short *pos = NULL;
-static short *table = NULL;
-static short *check = NULL;
-static int lowzero;
-static int high;
-
-struct obstack muscle_obstack;
-struct obstack output_obstack;
-
-int error_verbose = 0;
-
-/* FIXME. */
-
-static inline void
-output_table_data (struct obstack *oout,
- short *table_data,
- short first,
- short begin,
- short end)
-{
- int i;
- int j = 1;
+/* From src/scan-skel.l. */
+void scan_skel (FILE *);
- obstack_fgrow1 (oout, "%6d", first);
- for (i = begin; i < end; ++i)
- {
- obstack_1grow (oout, ',');
- if (j >= 10)
- {
- obstack_sgrow (oout, "\n ");
- j = 1;
- }
- else
- ++j;
- obstack_fgrow1 (oout, "%6d", table_data[i]);
- }
- obstack_1grow (oout, 0);
-}
+static struct obstack format_obstack;
-static void
-output_token_translations (void)
-{
- output_table_data (&output_obstack, token_translations,
- 0, 1, max_user_token_number + 1);
- muscle_insert ("translate", obstack_finish (&output_obstack));
- XFREE (token_translations);
-}
-
-
-static void
-output_gram (void)
-{
- {
- int i;
- short *values = XCALLOC (short, nrules + 1);
- for (i = 0; i < nrules + 1; ++i)
- values[i] = rule_table[i].rhs;
- output_table_data (&output_obstack, values,
- 0, 1, nrules + 1);
- XFREE (values);
- }
-
- muscle_insert ("prhs", obstack_finish (&output_obstack));
-
- {
- size_t yyrhs_size = 1;
- short *yyrhs, *sp;
- int i;
+int error_verbose = 0;
- for (sp = ritem + 1; *sp; sp++)
- ++yyrhs_size;
- yyrhs = XMALLOC (short, yyrhs_size);
- for (sp = ritem + 1, i = 1; *sp; ++sp, ++i)
- yyrhs[i] = *sp > 0 ? *sp : 0;
- output_table_data (&output_obstack, yyrhs,
- ritem[0], 1, yyrhs_size);
- muscle_insert ("rhs", obstack_finish (&output_obstack));
+/*-------------------------------------------------------------------.
+| Create a function NAME which associates to the muscle NAME the |
+| result of formatting the FIRST and then TABLE_DATA[BEGIN..END[ (of |
+| TYPE), and to the muscle NAME_max, the max value of the |
+| TABLE_DATA. |
+`-------------------------------------------------------------------*/
- XFREE (yyrhs);
- }
-#if 0
- if (!semantic_parser && !no_parser_flag)
- obstack_sgrow (&table_obstack, "\n#endif\n");
-#endif
+#define GENERATE_MUSCLE_INSERT_TABLE(Name, Type) \
+ \
+static void \
+Name (const char *name, \
+ Type *table_data, \
+ Type first, \
+ int begin, \
+ int end) \
+{ \
+ Type min = first; \
+ Type max = first; \
+ int i; \
+ int j = 1; \
+ \
+ obstack_fgrow1 (&format_obstack, "%6d", first); \
+ for (i = begin; i < end; ++i) \
+ { \
+ obstack_1grow (&format_obstack, ','); \
+ if (j >= 10) \
+ { \
+ obstack_sgrow (&format_obstack, "\n "); \
+ j = 1; \
+ } \
+ else \
+ ++j; \
+ obstack_fgrow1 (&format_obstack, "%6d", table_data[i]); \
+ if (table_data[i] < min) \
+ min = table_data[i]; \
+ if (max < table_data[i]) \
+ max = table_data[i]; \
+ } \
+ obstack_1grow (&format_obstack, 0); \
+ muscle_insert (name, obstack_finish (&format_obstack)); \
+ \
+ /* Build `NAME_min' and `NAME_max' in the obstack. */ \
+ obstack_fgrow1 (&format_obstack, "%s_min", name); \
+ obstack_1grow (&format_obstack, 0); \
+ MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), \
+ (long int) min); \
+ obstack_fgrow1 (&format_obstack, "%s_max", name); \
+ obstack_1grow (&format_obstack, 0); \
+ MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), \
+ (long int) max); \
}
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_unsigned_int_table, unsigned int)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_int_table, int)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_short_table, short)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_base_table, base_t)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_rule_number_table, rule_number_t)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_symbol_number_table, symbol_number_t)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_item_number_table, item_number_t)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number_t)
-static void
-output_stos (void)
-{
- int i;
- short *values = (short *) alloca (sizeof (short) * nstates);
- for (i = 0; i < nstates; ++i)
- values[i] = state_table[i].accessing_symbol;
- output_table_data (&output_obstack, values,
- 0, 1, nstates);
- muscle_insert ("stos", obstack_finish (&output_obstack));
-}
+/*------------------------------------------------------------------.
+| Prepare the muscles related to the symbols: translate, tname, and |
+| toknum. |
+`------------------------------------------------------------------*/
static void
-output_rule_data (void)
+prepare_symbols (void)
{
- int i;
- int j;
- short *short_tab = NULL;
+ 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);
- {
- short *values = XCALLOC (short, nrules + 1);
- for (i = 0; i < nrules + 1; ++i)
- values[i] = rule_table[i].line;
- output_table_data (&output_obstack, values,
- 0, 1, nrules + 1);
- muscle_insert ("rline", obstack_finish (&output_obstack));
- XFREE (values);
- }
+ 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;
+ for (i = 0; i < nsyms; i++)
+ {
+ /* Be sure not to use twice the same QUOTEARG slot:
+ SYMBOL_TAG_GET uses slot 0. */
+ const char *cp =
+ quotearg_n_style (1, c_quoting_style,
+ symbols[i]->tag);
+ /* Width of the next token, including the two quotes, the comma
+ and the space. */
+ int strsize = strlen (cp) + 2;
+
+ if (j + strsize > 75)
+ {
+ obstack_sgrow (&format_obstack, "\n ");
+ j = 2;
+ }
+
+ for (; *cp; cp++)
+ switch (*cp)
+ {
+ case '[': obstack_sgrow (&format_obstack, "@<:@"); break;
+ case ']': obstack_sgrow (&format_obstack, "@:>@"); break;
+ default: obstack_1grow (&format_obstack, *cp); break;
+ }
- j = 0;
- for (i = 0; i < nsyms; i++)
- /* this used to be i<=nsyms, but that output a final "" symbol
- almost by accident */
- {
- /* Width of the next token, including the two quotes, the coma
- and the space. */
- int strsize = 4;
- char *p;
-
- for (p = tags[i]; p && *p; p++)
- if (*p == '"' || *p == '\\' || *p == '\n' || *p == '\t'
- || *p == '\b')
- strsize += 2;
- else if (*p < 040 || *p >= 0177)
- strsize += 4;
- else
- strsize++;
-
- if (j + strsize > 75)
- {
- obstack_sgrow (&output_obstack, "\n ");
- j = 2;
- }
-
- obstack_1grow (&output_obstack, '\"');
- for (p = tags[i]; p && *p; p++)
- {
- if (*p == '"' || *p == '\\')
- obstack_fgrow1 (&output_obstack, "\\%c", *p);
- else if (*p == '\n')
- obstack_sgrow (&output_obstack, "\\n");
- else if (*p == '\t')
- obstack_sgrow (&output_obstack, "\\t");
- else if (*p == '\b')
- obstack_sgrow (&output_obstack, "\\b");
- else if (*p < 040 || *p >= 0177)
- obstack_fgrow1 (&output_obstack, "\\%03o", *p);
- else
- obstack_1grow (&output_obstack, *p);
- }
-
- obstack_sgrow (&output_obstack, "\", ");
- j += strsize;
- }
- /* add a NULL entry to list of tokens */
- obstack_sgrow (&output_obstack, "NULL");
+ obstack_sgrow (&format_obstack, ", ");
+ j += strsize;
+ }
+ /* Add a NULL entry to list of tokens (well, 0, as NULL might not be
+ defined). */
+ obstack_sgrow (&format_obstack, "0");
- /* Finish table and store. */
- obstack_1grow (&output_obstack, 0);
- muscle_insert ("tname", obstack_finish (&output_obstack));
+ /* Finish table and store. */
+ obstack_1grow (&format_obstack, 0);
+ muscle_insert ("tname", obstack_finish (&format_obstack));
+ }
/* Output YYTOKNUM. */
- output_table_data (&output_obstack, user_toknums,
- 0, 1, ntokens + 1);
- muscle_insert ("toknum", obstack_finish (&output_obstack));
-
- /* Output YYR1. */
{
- short *values = XCALLOC (short, nrules + 1);
- for (i = 0; i < nrules + 1; ++i)
- values[i] = rule_table[i].lhs;
- output_table_data (&output_obstack, values,
- 0, 1, nrules + 1);
- muscle_insert ("r1", obstack_finish (&output_obstack));
- XFREE (values);
+ int i;
+ int *values = XCALLOC (int, ntokens);
+ for (i = 0; i < ntokens; ++i)
+ values[i] = symbols[i]->user_token_number;
+ muscle_insert_int_table ("toknum", values,
+ values[0], 1, ntokens);
+ free (values);
}
-
- /* Output YYR2. */
- short_tab = XMALLOC (short, nrules + 1);
- for (i = 1; i < nrules; i++)
- short_tab[i] = rule_table[i + 1].rhs - rule_table[i].rhs - 1;
- short_tab[nrules] = nitems - rule_table[nrules].rhs - 1;
- output_table_data (&output_obstack, short_tab,
- 0, 1, nrules + 1);
- muscle_insert ("r2", obstack_finish (&output_obstack));
- XFREE (short_tab);
-
- XFREE (rule_table + 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 |
-| MINSHORT, 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. |
-`------------------------------------------------------------------*/
-
-static int
-action_row (int state)
-{
- int i;
- int j;
- int k;
- int m = 0;
- int n = 0;
- int default_rule;
- int nreds;
- int rule;
- int shift_state;
- int symbol;
- reductions *redp;
- shifts *shiftp;
- errs *errp;
- int nodefault = 0; /* set nonzero to inhibit having any default reduction */
-
- for (i = 0; i < ntokens; i++)
- actrow[i] = 0;
-
- default_rule = 0;
- nreds = 0;
- redp = state_table[state].reduction_table;
-
- if (redp)
- {
- nreds = redp->nreds;
-
- if (nreds >= 1)
- {
- /* loop over all the rules available here which require
- lookahead */
- m = state_table[state].lookaheads;
- n = state_table[state + 1].lookaheads;
-
- for (i = n - 1; i >= m; i--)
- /* and find each token which the rule finds acceptable
- to come next */
- for (j = 0; j < ntokens; j++)
- /* and record this rule as the rule to use if that
- token follows. */
- if (BITISSET (LA (i), j))
- actrow[j] = -LAruleno[i];
- }
- }
-
- /* 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. */
- shiftp = state_table[state].shift_table;
- for (i = 0; i < shiftp->nshifts; i++)
- {
- shift_state = shiftp->shifts[i];
- if (!shift_state)
- continue;
-
- symbol = state_table[shift_state].accessing_symbol;
-
- if (ISVAR (symbol))
- break;
-
- actrow[symbol] = shift_state;
-
- /* Do not use any default reduction if there is a shift for
- error */
- if (symbol == error_token_number)
- nodefault = 1;
- }
-
- /* See which tokens are an explicit error in this state (due to
- %nonassoc). For them, record MINSHORT as the action. */
- errp = err_table[state];
-
- if (errp)
- {
- k = errp->nerrs;
-
- for (i = 0; i < k; i++)
- {
- symbol = errp->errs[i];
- actrow[symbol] = MINSHORT;
- }
- }
-
- /* Now find the most common reduction and make it the default action
- for this state. */
-
- if (nreds >= 1 && !nodefault)
- {
- if (state_table[state].consistent)
- default_rule = redp->rules[0];
- else
- {
- int max = 0;
- for (i = m; i < n; i++)
- {
- int count = 0;
- rule = -LAruleno[i];
-
- for (j = 0; j < ntokens; j++)
- {
- if (actrow[j] == rule)
- count++;
- }
-
- if (count > max)
- {
- max = count;
- default_rule = rule;
- }
- }
-
- /* actions which match the default are replaced with zero,
- which means "use the default" */
-
- if (max > 0)
- {
- for (j = 0; j < ntokens; j++)
- {
- if (actrow[j] == default_rule)
- actrow[j] = 0;
- }
-
- default_rule = -default_rule;
- }
- }
- }
-
- /* If have no default rule, the default is an error.
- So replace any action which says "error" with "use default". */
-
- if (default_rule == 0)
- for (j = 0; j < ntokens; j++)
- {
- if (actrow[j] == MINSHORT)
- actrow[j] = 0;
- }
-
- return default_rule;
-}
+/*-------------------------------------------------------------.
+| Prepare the muscles related to the rules: rhs, prhs, r1, r2, |
+| rline, dprec, merger |
+`-------------------------------------------------------------*/
static void
-save_row (int state)
+prepare_rules (void)
{
- int i;
- int count;
- short *sp;
- short *sp1;
- short *sp2;
-
- count = 0;
- for (i = 0; i < ntokens; i++)
- {
- if (actrow[i] != 0)
- count++;
- }
-
- if (count == 0)
- return;
-
- froms[state] = sp1 = sp = XCALLOC (short, count);
- tos[state] = sp2 = XCALLOC (short, count);
-
- for (i = 0; i < ntokens; i++)
+ rule_number_t r;
+ unsigned int i = 0;
+ item_number_t *rhs = XMALLOC (item_number_t, nritems);
+ unsigned int *prhs = XMALLOC (unsigned int, nrules);
+ unsigned int *rline = XMALLOC (unsigned int, nrules);
+ symbol_number_t *r1 = XMALLOC (symbol_number_t, nrules);
+ unsigned int *r2 = XMALLOC (unsigned int, nrules);
+ short *dprec = XMALLOC (short, nrules);
+ short *merger = XMALLOC (short, nrules);
+
+ for (r = 0; r < nrules; ++r)
{
- if (actrow[i] != 0)
- {
- *sp1++ = i;
- *sp2++ = actrow[i];
- }
+ item_number_t *rhsp = NULL;
+ /* Index of rule R in RHS. */
+ prhs[r] = i;
+ /* RHS of the rule R. */
+ for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
+ rhs[i++] = *rhsp;
+ /* LHS of the rule R. */
+ r1[r] = rules[r].lhs->number;
+ /* Length of rule R's RHS. */
+ r2[r] = i - prhs[r];
+ /* Separator in RHS. */
+ rhs[i++] = -1;
+ /* Line where rule was defined. */
+ rline[r] = rules[r].location.first_line;
+ /* Dynamic precedence (GLR) */
+ dprec[r] = rules[r].dprec;
+ /* Merger-function index (GLR) */
+ merger[r] = rules[r].merger;
}
-
- tally[state] = count;
- width[state] = sp1[-1] - sp[0] + 1;
+ assert (i == nritems);
+
+ muscle_insert_item_number_table ("rhs", rhs, ritem[0], 1, nritems);
+ muscle_insert_unsigned_int_table ("prhs", prhs, 0, 0, nrules);
+ muscle_insert_unsigned_int_table ("rline", rline, 0, 0, nrules);
+ muscle_insert_symbol_number_table ("r1", r1, 0, 0, nrules);
+ muscle_insert_unsigned_int_table ("r2", r2, 0, 0, nrules);
+ 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);
+ free (r1);
+ free (r2);
+ free (dprec);
+ free (merger);
}
-
-/*------------------------------------------------------------------.
-| 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. |
-`------------------------------------------------------------------*/
+/*--------------------------------------------.
+| Prepare the muscles related to the states. |
+`--------------------------------------------*/
static void
-token_actions (void)
+prepare_states (void)
{
- int i;
- short *yydefact = XCALLOC (short, nstates);
-
- actrow = XCALLOC (short, ntokens);
+ state_number_t i;
+ symbol_number_t *values =
+ (symbol_number_t *) alloca (sizeof (symbol_number_t) * nstates);
for (i = 0; i < nstates; ++i)
- {
- yydefact[i] = action_row (i);
- save_row (i);
- }
+ values[i] = states[i]->accessing_symbol;
+ muscle_insert_symbol_number_table ("stos", values,
+ 0, 1, nstates);
- output_table_data (&output_obstack, yydefact,
- yydefact[0], 1, nstates);
- muscle_insert ("defact", obstack_finish (&output_obstack));
-
- XFREE (actrow);
- XFREE (yydefact);
+ MUSCLE_INSERT_INT ("last", high);
+ MUSCLE_INSERT_INT ("final_state_number", final_state->number);
+ MUSCLE_INSERT_INT ("states_number", nstates);
}
-static void
-save_column (int symbol, int default_state)
-{
- int i;
- short *sp;
- short *sp1;
- short *sp2;
- int count;
- int symno;
-
- short begin = goto_map[symbol];
- short end = goto_map[symbol + 1];
-
- count = 0;
- for (i = begin; i < end; i++)
- {
- if (to_state[i] != default_state)
- count++;
- }
- if (count == 0)
- return;
+/*---------------------------------.
+| Output the user actions to OUT. |
+`---------------------------------*/
- symno = symbol - ntokens + nstates;
-
- froms[symno] = sp1 = sp = XCALLOC (short, count);
- tos[symno] = sp2 = XCALLOC (short, count);
-
- 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;
-}
-
-static int
-default_goto (int symbol)
+static void
+user_actions_output (FILE *out)
{
- int i;
- int m;
- int n;
- int default_state;
- int max;
-
- m = goto_map[symbol];
- n = goto_map[symbol + 1];
-
- if (m == n)
- return -1;
+ rule_number_t r;
- for (i = 0; i < nstates; i++)
- state_count[i] = 0;
-
- for (i = m; i < n; i++)
- state_count[to_state[i]]++;
-
- max = 0;
- default_state = -1;
-
- for (i = 0; i < nstates; i++)
- {
- if (state_count[i] > max)
- {
- max = state_count[i];
- default_state = i;
- }
- }
-
- return default_state;
+ fputs ("m4_define([b4_actions], \n[[", out);
+ for (r = 0; r < nrules; ++r)
+ if (rules[r].action)
+ {
+ fprintf (out, " case %d:\n", r + 1);
+
+ fprintf (out, "]b4_syncline([[%d]], [[%s]])[\n",
+ rules[r].action_location.first_line,
+ quotearg_style (escape_quoting_style,
+ rules[r].action_location.file));
+ fprintf (out, " %s\n break;\n\n",
+ rules[r].action);
+ }
+ fputs ("]])\n\n", out);
}
-
-/*-------------------------------------------------------------------.
-| 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. |
-`-------------------------------------------------------------------*/
+/*--------------------------------------.
+| Output the merge functions to OUT. |
+`--------------------------------------*/
static void
-goto_actions (void)
+merger_output (FILE *out)
{
- int i;
- short *yydefgoto = XMALLOC (short, nsyms - ntokens);
+ int n;
+ merger_list* p;
- state_count = XCALLOC (short, nstates);
- for (i = ntokens; i < nsyms; ++i)
+ fputs ("m4_define([b4_mergers], \n[[", out);
+ for (n = 1, p = merge_functions; p != NULL; n += 1, p = p->next)
{
- int default_state = default_goto (i);
- save_column (i, default_state);
- yydefgoto[i - ntokens] = default_state;
+ if (p->type[0] == '\0')
+ fprintf (out, " case %d: yyval = %s (*yy0, *yy1); break;\n",
+ n, p->name);
+ else
+ fprintf (out, " case %d: yyval.%s = %s (*yy0, *yy1); break;\n",
+ n, p->type, p->name);
}
-
- output_table_data (&output_obstack, yydefgoto,
- yydefgoto[0], 1, nsyms - ntokens);
- muscle_insert ("defgoto", obstack_finish (&output_obstack));
-
- XFREE (state_count);
- XFREE (yydefgoto);
+ fputs ("]])\n\n", out);
}
-
-/* The next few functions decide how to pack the actions and gotos
- information into yytable. */
+/*--------------------------------------.
+| Output the tokens definition to OUT. |
+`--------------------------------------*/
static void
-sort_actions (void)
+token_definitions_output (FILE *out)
{
int i;
- int j;
- int k;
- int t;
- int w;
-
- order = XCALLOC (short, nvectors);
- nentries = 0;
+ int first = 1;
- for (i = 0; i < nvectors; i++)
+ fputs ("m4_define([b4_tokens], \n[", out);
+ for (i = 0; i < ntokens; ++i)
{
- if (tally[i] > 0)
- {
- t = tally[i];
- w = width[i];
- j = nentries - 1;
-
- while (j >= 0 && (width[order[j]] < w))
- j--;
-
- while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t))
- j--;
+ symbol_t *symbol = symbols[i];
+ int number = symbol->user_token_number;
- for (k = nentries - 1; k > j; k--)
- order[k + 1] = order[k];
+ /* At this stage, if there are literal aliases, they are part of
+ SYMBOLS, so we should not find symbols which are the aliases
+ here. */
+ assert (number != USER_NUMBER_ALIAS);
- order[j + 1] = i;
- nentries++;
- }
- }
-}
+ /* Skip error token. */
+ if (symbol == errtoken)
+ continue;
+ /* If this string has an alias, then it is necessarily the alias
+ which is to be output. */
+ if (symbol->alias)
+ symbol = symbol->alias;
-static int
-matching_state (int vector)
-{
- int i;
- int j;
- int k;
- int t;
- int w;
- int match;
- int prev;
+ /* Don't output literal chars or strings (when defined only as a
+ string). Note that must be done after the alias resolution:
+ think about `%token 'f' "f"'. */
+ if (symbol->tag[0] == '\'' || symbol->tag[0] == '\"')
+ continue;
- i = order[vector];
- if (i >= nstates)
- return -1;
+ /* Don't #define nonliteral tokens whose names contain periods
+ or '$' (as does the default value of the EOF token). */
+ if (strchr (symbol->tag, '.') || strchr (symbol->tag, '$'))
+ continue;
- t = tally[i];
- w = width[i];
+ fprintf (out, "%s[[[%s]], [%d]]",
+ first ? "" : ",\n", symbol->tag, number);
- for (prev = vector - 1; prev >= 0; prev--)
- {
- j = order[prev];
- if (width[j] != w || tally[j] != t)
- return -1;
-
- match = 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;
+ first = 0;
}
-
- return -1;
+ fputs ("])\n\n", out);
}
-static int
-pack_vector (int vector)
-{
- int i;
- int j;
- int k;
- int t;
- int loc = 0;
- int ok;
- short *from;
- short *to;
-
- i = order[vector];
- t = tally[i];
-
- assert (t);
-
- from = froms[i];
- to = tos[i];
-
- for (j = lowzero - from[0]; j < MAXTABLE; j++)
- {
- ok = 1;
-
- for (k = 0; ok && k < t; k++)
- {
- loc = j + from[k];
- if (loc > MAXTABLE)
- fatal (_("maximum table size (%d) exceeded"), MAXTABLE);
-
- 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];
- check[loc] = from[k];
- }
-
- while (table[lowzero] != 0)
- lowzero++;
-
- if (loc > high)
- high = loc;
-
- return j;
- }
- }
-
- berror ("pack_vector");
- return 0; /* JF keep lint happy */
-}
-
+/*---------------------------------------.
+| Output the symbol destructors to OUT. |
+`---------------------------------------*/
static void
-pack_table (void)
+symbol_destructors_output (FILE *out)
{
int i;
- int place;
- int state;
-
- base = XCALLOC (short, nvectors);
- pos = XCALLOC (short, nentries);
- table = XCALLOC (short, MAXTABLE);
- check = XCALLOC (short, MAXTABLE);
-
- lowzero = 0;
- high = 0;
-
- for (i = 0; i < nvectors; i++)
- base[i] = MINSHORT;
+ int first = 1;
- for (i = 0; i < MAXTABLE; i++)
- check[i] = -1;
-
- for (i = 0; i < nentries; i++)
- {
- state = matching_state (i);
-
- if (state < 0)
- place = pack_vector (i);
- else
- place = base[state];
-
- pos[i] = place;
- base[order[i]] = place;
- }
-
- for (i = 0; i < nvectors; i++)
- {
- if (froms[i])
- XFREE (froms[i]);
- if (tos[i])
- XFREE (tos[i]);
- }
-
- XFREE (froms);
- XFREE (tos);
- XFREE (pos);
+ fputs ("m4_define([b4_symbol_destructors], \n[", out);
+ for (i = 0; i < nsyms; ++i)
+ if (symbols[i]->destructor)
+ {
+ symbol_t *symbol = symbols[i];
+
+ /* Filename, lineno,
+ Symbol-name, Symbol-number,
+ destructor, typename. */
+ fprintf (out, "%s[[[%s]], [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]",
+ first ? "" : ",\n",
+ symbol->destructor_location.file,
+ symbol->destructor_location.first_line,
+ symbol->tag,
+ symbol->number,
+ symbol->destructor,
+ symbol->type_name);
+
+ first = 0;
+ }
+ fputs ("])\n\n", out);
}
-/* the following functions output yytable, yycheck
- and the vectors whose elements index the portion starts */
-
-static void
-output_base (void)
-{
- /* Output pact. */
- output_table_data (&output_obstack, base,
- base[0], 1, nstates);
- muscle_insert ("pact", obstack_finish (&output_obstack));
-
- /* Output pgoto. */
- output_table_data (&output_obstack, base,
- base[nstates], nstates + 1, nvectors);
- muscle_insert ("pgoto", obstack_finish (&output_obstack));
-
- XFREE (base);
-}
+/*------------------------------------.
+| Output the symbol printers to OUT. |
+`------------------------------------*/
static void
-output_table (void)
+symbol_printers_output (FILE *out)
{
- output_table_data (&output_obstack, table,
- table[0], 1, high + 1);
- muscle_insert ("table", obstack_finish (&output_obstack));
- XFREE (table);
-}
-
+ int i;
+ int first = 1;
-static void
-output_check (void)
-{
- output_table_data (&output_obstack, check,
- check[0], 1, high + 1);
- muscle_insert ("check", obstack_finish (&output_obstack));
- XFREE (check);
+ fputs ("m4_define([b4_symbol_printers], \n[", out);
+ for (i = 0; i < nsyms; ++i)
+ if (symbols[i]->destructor)
+ {
+ symbol_t *symbol = symbols[i];
+
+ /* Filename, lineno,
+ Symbol-name, Symbol-number,
+ printer, typename. */
+ fprintf (out, "%s[[[%s]], [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]",
+ first ? "" : ",\n",
+ symbol->printer_location.file,
+ symbol->printer_location.first_line,
+ symbol->tag,
+ symbol->number,
+ symbol->printer,
+ symbol->type_name);
+
+ first = 0;
+ }
+ fputs ("])\n\n", out);
}
-/* compute and output yydefact, yydefgoto, yypact, yypgoto, yytable
- and yycheck. */
static void
-output_actions (void)
+prepare_actions (void)
{
- nvectors = nstates + nvars;
-
- froms = XCALLOC (short *, nvectors);
- tos = XCALLOC (short *, nvectors);
- tally = XCALLOC (short, nvectors);
- width = XCALLOC (short, nvectors);
-
- token_actions ();
- LIST_FREE (shifts, first_shift);
- LIST_FREE (reductions, first_reduction);
- XFREE (LA);
- XFREE (LAruleno);
-
- goto_actions ();
- XFREE (goto_map + ntokens);
- XFREE (from_state);
- XFREE (to_state);
-
- sort_actions ();
- pack_table ();
-
- output_base ();
- output_table ();
-
- output_check ();
- XFREE (state_table);
+ /* Figure out the actions for the specified state, indexed by
+ lookahead token type. */
+
+ 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);
+
+
+ /* Output PACT. */
+ muscle_insert_base_table ("pact", base,
+ base[0], 1, nstates);
+ MUSCLE_INSERT_INT ("pact_ninf", base_ninf);
+
+ /* Output PGOTO. */
+ muscle_insert_base_table ("pgoto", base,
+ base[nstates], nstates + 1, nvectors);
+
+ muscle_insert_base_table ("table", table,
+ table[0], 1, high + 1);
+ MUSCLE_INSERT_INT ("table_ninf", table_ninf);
+
+ muscle_insert_base_table ("check", check,
+ check[0], 1, high + 1);
+
+ /* 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 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
-/*------------------------------------------------------------.
-| Copy the parser code from SKEL_FILENAME into OOUT obstack. |
-| and do the muscle substitution. |
-`------------------------------------------------------------*/
+/*---------------------------.
+| Call the skeleton parser. |
+`---------------------------*/
static void
-output_parser (const char *skel_filename, struct obstack *oout)
+output_skeleton (void)
{
- int c;
- FILE *fskel;
- size_t line;
-
- fskel = xfopen (skel_filename, "r");
-
- /* New output code. */
- line = 1;
- c = getc (fskel);
- while (c != EOF)
- {
- if (c != '%')
- {
- if (c == '\n')
- ++line;
- obstack_1grow (oout, c);
- c = getc (fskel);
- }
- else if ((c = getc (fskel)) == '%')
- {
- /* Read the muscle. */
- const char *muscle_key = 0;
- const char *muscle_value = 0;
-
- while (isalnum (c = getc (fskel)) || c == '-')
- obstack_1grow (&muscle_obstack, c);
- obstack_1grow (&muscle_obstack, 0);
-
- /* Output the right value, or see if it's something special. */
- muscle_key = obstack_finish (&muscle_obstack);
- muscle_value = muscle_find (muscle_key);
- if (muscle_value)
- obstack_sgrow (oout, muscle_value);
- else if (!strcmp (muscle_key, "line"))
- obstack_fgrow1 (oout, "%d", line + 1);
- else if (!strcmp (muscle_key, "input-line"))
- obstack_fgrow1 (oout, "%d", lineno);
- else
- {
- obstack_sgrow (oout, "%%");
- obstack_sgrow (oout, muscle_key);
- }
- }
- else
- obstack_1grow (oout, '%');
- }
-
- /* End. */
- xfclose (fskel);
+ 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)
+ error (EXIT_FAILURE, errno, "%s", full_path);
+ xfclose (in);
+ 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);
+
+ user_actions_output (out);
+ merger_output (out);
+ token_definitions_output (out);
+ symbol_destructors_output (out);
+ symbol_printers_output (out);
+
+ muscles_m4_output (out);
+
+ fputs ("m4_wrap([m4_divert_pop(0)])\n", out);
+ fputs ("m4_divert_push(0)dnl\n", out);
+ xfclose (out);
+
+ /* 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);
+ xfclose (in);
+ reap_subpipe (pid, m4);
+ timevar_pop (TV_M4);
}
-/*----------------------------------------.
-| Prepare the master parser to be output |
-`----------------------------------------*/
-
static void
-output_master_parser (void)
+prepare (void)
{
+ /* Flags. */
+ MUSCLE_INSERT_INT ("debug", debug_flag);
+ MUSCLE_INSERT_INT ("defines_flag", defines_flag);
+ MUSCLE_INSERT_INT ("error_verbose", error_verbose);
+ MUSCLE_INSERT_INT ("locations_flag", locations_flag);
+ MUSCLE_INSERT_INT ("pure", pure_parser);
+ MUSCLE_INSERT_INT ("synclines_flag", !no_lines_flag);
+
+ /* FIXME: This is wrong: the muscles should decide whether they hold
+ a copy or not, but the situation is too obscure currently. */
+ MUSCLE_INSERT_STRING ("prefix", spec_name_prefix ? spec_name_prefix : "yy");
+ MUSCLE_INSERT_STRING ("output_infix", output_infix ? output_infix : "");
+ MUSCLE_INSERT_STRING ("output_prefix", short_base_name);
+ MUSCLE_INSERT_STRING ("output_parser_name", parser_file_name);
+ MUSCLE_INSERT_STRING ("output_header_name", spec_defines_file);
+
+ /* User Code. */
+ obstack_1grow (&pre_prologue_obstack, 0);
+ obstack_1grow (&post_prologue_obstack, 0);
+ muscle_insert ("pre_prologue", obstack_finish (&pre_prologue_obstack));
+ muscle_insert ("post_prologue", obstack_finish (&post_prologue_obstack));
+
+ /* Find the right skeleton file. */
if (!skeleton)
{
- if (semantic_parser)
- skeleton = skeleton_find ("BISON_HAIRY", BISON_HAIRY);
+ if (glr_parser)
+ skeleton = "glr.c";
else
- skeleton = skeleton_find ("BISON_SIMPLE", BISON_SIMPLE);
+ skeleton = "yacc.c";
}
- muscle_insert ("skeleton", skeleton);
- output_parser (skeleton, &table_obstack);
-}
-
-
-/* FIXME. */
-
-#define MUSCLE_INSERT_INT(Key, Value) \
-{ \
- obstack_fgrow1 (&muscle_obstack, "%d", Value); \
- obstack_1grow (&muscle_obstack, 0); \
- muscle_insert (Key, obstack_finish (&muscle_obstack)); \
-}
-#define MUSCLE_INSERT_STRING(Key, Value) \
-{ \
- obstack_sgrow (&muscle_obstack, Value); \
- obstack_1grow (&muscle_obstack, 0); \
- muscle_insert (Key, obstack_finish (&muscle_obstack)); \
+ /* Parse the skeleton file and output the needed parsers. */
+ MUSCLE_INSERT_STRING ("skeleton", skeleton);
}
-#define MUSCLE_INSERT_PREFIX(Key, Value) \
-{ \
- obstack_fgrow2 (&muscle_obstack, "%s%s", spec_name_prefix, Value); \
- obstack_1grow (&muscle_obstack, 0); \
- muscle_insert (Key, obstack_finish (&muscle_obstack)); \
-}
-
-static void
-prepare (void)
-{
- MUSCLE_INSERT_INT ("last", high);
- MUSCLE_INSERT_INT ("flag", MINSHORT);
- MUSCLE_INSERT_INT ("pure", pure_parser);
- MUSCLE_INSERT_INT ("nsym", nsyms);
- MUSCLE_INSERT_INT ("debug", debug_flag);
- MUSCLE_INSERT_INT ("final", final_state);
- MUSCLE_INSERT_INT ("maxtok", max_user_token_number);
- MUSCLE_INSERT_INT ("ntbase", ntokens);
- MUSCLE_INSERT_INT ("error-verbose", error_verbose);
-
- MUSCLE_INSERT_INT ("nnts", nvars);
- MUSCLE_INSERT_INT ("nrules", nrules);
- MUSCLE_INSERT_INT ("nstates", nstates);
- MUSCLE_INSERT_INT ("ntokens", ntokens);
-
- MUSCLE_INSERT_INT ("locations-flag", locations_flag);
-
- /* We need to save the actions in the muscle %%action. */
- muscle_insert ("action", obstack_finish (&action_obstack));
-
- if (spec_name_prefix)
- MUSCLE_INSERT_STRING ("prefix", spec_name_prefix);
-}
/*----------------------------------------------------------.
| Output the parsing tables and the parser code to ftable. |
void
output (void)
{
- obstack_init (&output_obstack);
-
- LIST_FREE (core, first_state);
-
- output_token_translations ();
- output_gram ();
+ obstack_init (&format_obstack);
- XFREE (ritem);
- if (semantic_parser)
- output_stos ();
- output_rule_data ();
- XFREE (user_toknums);
- output_actions ();
+ prepare_symbols ();
+ prepare_rules ();
+ prepare_states ();
+ prepare_actions ();
-#if 0
- if (!no_parser_flag) */
-#endif
prepare ();
- /* Copy definitions in directive. */
- muscle_insert ("prologue", obstack_finish (&attrs_obstack));
- output_master_parser ();
+ /* Process the selected skeleton file. */
+ output_skeleton ();
- obstack_free (&muscle_obstack, 0);
- obstack_free (&output_obstack, 0);
- obstack_free (&action_obstack, 0);
+ obstack_free (&format_obstack, NULL);
+ obstack_free (&pre_prologue_obstack, NULL);
+ obstack_free (&post_prologue_obstack, NULL);
}
projects / bison.git / blobdiff