-/* Output the generated parsing program for bison,
- Copyright 1984, 1986, 1989, 1992, 2000 Free Software Foundation, Inc.
+/* Output the generated parsing program for Bison.
+
+ Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
+ 2005, 2006, 2007, 2008 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.
+ This program 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 3 of the License, 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.
+ This program 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.
- 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.
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
- 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.
+#include <config.h>
+#include "system.h"
- YYFINAL = the state number of the termination state.
- YYFLAG = most negative short int. Used to flag ??
- YYNTBASE = ntokens.
-*/
+#include <configmake.h>
+#include <error.h>
+#include <get-errno.h>
+#include <quotearg.h>
+#include <subpipe.h>
+#include <timevar.h>
-#include "system.h"
-#include "obstack.h"
-#include "quotearg.h"
-#include "getargs.h"
-#include "xalloc.h"
+#include "complain.h"
#include "files.h"
+#include "getargs.h"
#include "gram.h"
-#include "LR0.h"
-#include "complain.h"
+#include "muscle_tab.h"
#include "output.h"
-#include "lalr.h"
#include "reader.h"
-#include "conflicts.h"
-
-extern void berror PARAMS((const char *));
-
-
-
-static int nvectors;
-static int nentries;
-static short **froms;
-static short **tos;
-static short *tally;
-static short *width;
-static short *actrow;
-static short *state_count;
-static short *order;
-static short *base;
-static short *pos;
-static short *table;
-static short *check;
-static int lowzero;
-static int high;
-
-
-
-static inline void
-output_short_or_char_table (struct obstack *oout,
- const char *comment,
- const char *type,
- const char *table_name,
- short *short_table,
- short first_value,
- short begin, short end)
-{
- int i, j;
+#include "scan-code.h" /* max_left_semantic_context */
+#include "scan-skel.h"
+#include "symtab.h"
+#include "tables.h"
- if (comment)
- obstack_fgrow1 (oout, "/* %s. */\n", comment);
- obstack_fgrow3 (oout, "static const %s %s[] =\n{\n %6d",
- type, table_name, first_value);
+static struct obstack format_obstack;
- j = 1;
- for (i = begin; i < end; i++)
- {
- obstack_1grow (oout, ',');
- if (j >= 10)
- {
- obstack_grow_literal_string (oout, "\n ");
- j = 1;
- }
- else
- {
- j++;
- }
+/*-------------------------------------------------------------------.
+| 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. |
+`-------------------------------------------------------------------*/
- obstack_fgrow1 (oout, "%6d", short_table[i]);
- }
- obstack_grow_literal_string (oout, "\n};\n");
+#define GENERATE_MUSCLE_INSERT_TABLE(Name, Type) \
+ \
+static void \
+Name (char const *name, \
+ Type *table_data, \
+ Type first, \
+ int begin, \
+ int end) \
+{ \
+ Type min = first; \
+ Type max = first; \
+ long int lmin; \
+ long int lmax; \
+ 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)); \
+ \
+ lmin = min; \
+ lmax = max; \
+ /* 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), lmin); \
+ obstack_fgrow1 (&format_obstack, "%s_max", name); \
+ obstack_1grow (&format_obstack, 0); \
+ MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmax); \
}
-
-static inline void
-output_short_table (struct obstack *oout,
- const char *comment,
- const char *table_name,
- short *short_table,
- short first_value,
- short begin, short end)
-{
- output_short_or_char_table (oout, comment, "short", table_name, short_table,
- first_value, begin, end);
-}
+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_base_table, base_number)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_rule_number_table, rule_number)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_symbol_number_table, symbol_number)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_item_number_table, item_number)
+GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number)
-/*--------------------------------------------------------------.
-| output_headers -- Output constant strings to the beginning of |
-| certain files. |
-`--------------------------------------------------------------*/
-
-/* Don't put the `%s' insides quotes, since it quotearg puts them. */
-
-#define GUARDSTR \
-"\n\
-#include %s\n\
-extern int yyerror;\n\
-extern int yycost;\n\
-extern char * yymsg;\n\
-extern YYSTYPE yyval;\n\
-\n\
-yyguard(n, yyvsp, yylsp)\n\
-register int n;\n\
-register YYSTYPE *yyvsp;\n\
-register YYLTYPE *yylsp;\n\
-{\n\
- yyerror = 0;\n\
- yycost = 0;\n\
- yymsg = 0;\n\
- switch (n)\n\
- {"
-
-#define ACTSTR \
-"\n\
-#include %s\n\
-extern YYSTYPE yyval;\n\
-extern int yychar;\n\
-\n\
-yyaction(n, yyvsp, yylsp)\n\
-register int n;\n\
-register YYSTYPE *yyvsp;\n\
-register YYLTYPE *yylsp;\n\
-{\n\
- switch (n)\n\
- {"
-
-#define ACTSTR_SIMPLE "\n switch (yyn) {\n"
+/*--------------------------------------------------------------------.
+| Print to OUT a representation of STRING escaped both for C and M4. |
+`--------------------------------------------------------------------*/
-void
-output_headers (void)
-{
- char *attrsfile_quoted = quotearg_style (c_quoting_style, attrsfile);
-
- if (semantic_parser)
- fprintf (fguard, GUARDSTR, attrsfile_quoted);
-
- if (no_parser_flag)
- return;
-
- if (semantic_parser)
- obstack_fgrow1 (&action_obstack, ACTSTR, attrsfile_quoted);
- else
- obstack_grow_literal_string (&action_obstack, ACTSTR_SIMPLE);
-
-/* if (semantic_parser) JF moved this below
- fprintf(ftable, "#include \"%s\"\n", attrsfile);
- fprintf(ftable, "#include <stdio.h>\n\n");
-*/
-
- /* Rename certain symbols if -p was specified. */
- if (spec_name_prefix)
- {
- obstack_fgrow1 (&table_obstack,
- "#define yyparse %sparse\n", spec_name_prefix);
- obstack_fgrow1 (&table_obstack,
- "#define yylex %slex\n", spec_name_prefix);
- obstack_fgrow1 (&table_obstack,
- "#define yyerror %serror\n", spec_name_prefix);
- obstack_fgrow1 (&table_obstack,
- "#define yylval %slval\n", spec_name_prefix);
- obstack_fgrow1 (&table_obstack,
- "#define yychar %schar\n", spec_name_prefix);
- obstack_fgrow1 (&table_obstack,
- "#define yydebug %sdebug\n", spec_name_prefix);
- obstack_fgrow1 (&table_obstack,
- "#define yynerrs %snerrs\n", spec_name_prefix);
- }
-}
-
-
-/*-------------------------------------------------------.
-| Output constant strings to the ends of certain files. |
-`-------------------------------------------------------*/
-
-void
-output_trailers (void)
+static void
+escaped_output (FILE *out, char const *string)
{
- if (semantic_parser)
- fprintf (fguard, "\n }\n}\n");
+ char const *p;
+ fprintf (out, "[[");
- obstack_1grow (&action_obstack, '\n');
-
- if (no_parser_flag)
- return;
-
- if (semantic_parser)
- obstack_grow_literal_string (&action_obstack, " }\n");
+ for (p = quotearg_style (c_quoting_style, string); *p; p++)
+ switch (*p)
+ {
+ case '$': fputs ("$][", out); break;
+ case '@': fputs ("@@", out); break;
+ case '[': fputs ("@{", out); break;
+ case ']': fputs ("@}", out); break;
+ default: fputc (*p, out); break;
+ }
- obstack_grow_literal_string (&action_obstack, "}\n");
+ fprintf (out, "]]");
}
+/*------------------------------------------------------------------.
+| Prepare the muscles related to the symbols: translate, tname, and |
+| toknum. |
+`------------------------------------------------------------------*/
static void
-output_token_translations (void)
-{
- obstack_grow_literal_string (&table_obstack, "\
-\n\
-/* YYRANSLATE(YYLEX) -- Bison token number corresponding to YYLEX. */\n");
-
- if (translations)
- {
- obstack_fgrow2 (&table_obstack,
- "#define YYTRANSLATE(x) ((unsigned)(x) <= %d ? yytranslate[x] : %d)\
-\n\
-\n",
- max_user_token_number, nsyms);
-
- output_short_or_char_table (&table_obstack,
- "YYRANSLATE[YYLEX] -- Bison token number corresponding to YYLEX",
- ntokens < 127 ? "char" : "short",
- "yytranslate", token_translations,
- 0, 1, max_user_token_number + 1);
- }
- else
- {
- obstack_grow_literal_string (&table_obstack,
- "\n#define YYTRANSLATE(x) (x)\n");
- }
-}
-
-
-static void
-output_gram (void)
+prepare_symbols (void)
{
- /* With the ordinary parser,
- yyprhs and yyrhs are needed only for yydebug. */
- /* With the no_parser option, all tables are generated */
- if (!semantic_parser && !no_parser_flag)
- obstack_grow_literal_string (&table_obstack, "\n#if YYDEBUG != 0\n");
-
- output_short_table (&table_obstack, NULL, "yyprhs", rrhs,
- 0, 1, nrules + 1);
-
+ MUSCLE_INSERT_BOOL ("token_table", token_table_flag);
+ 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. */
{
- size_t yyrhs_size = 1;
- short *yyrhs, *sp;
int i;
+ /* We assume that the table will be output starting at column 2. */
+ int j = 2;
+ struct quoting_options *qo = clone_quoting_options (0);
+ set_quoting_style (qo, c_quoting_style);
+ set_quoting_flags (qo, QA_SPLIT_TRIGRAPHS);
+ for (i = 0; i < nsyms; i++)
+ {
+ char *cp = quotearg_alloc (symbols[i]->tag, -1, qo);
+ /* Width of the next token, including the two quotes, the
+ comma and the space. */
+ int width = strlen (cp) + 2;
- for (sp = ritem + 1; *sp; sp++)
- ++yyrhs_size;
- yyrhs = XMALLOC (short, yyrhs_size);
+ if (j + width > 75)
+ {
+ obstack_sgrow (&format_obstack, "\n ");
+ j = 1;
+ }
- for (sp = ritem + 1, i = 1; *sp; ++sp, ++i)
- yyrhs[i] = *sp > 0 ? *sp : 0;
+ if (i)
+ obstack_1grow (&format_obstack, ' ');
+ MUSCLE_OBSTACK_SGROW (&format_obstack, cp);
+ free (cp);
+ obstack_1grow (&format_obstack, ',');
+ j += width;
+ }
+ free (qo);
+ obstack_sgrow (&format_obstack, " ]b4_null[");
- output_short_table (&table_obstack, NULL, "yyrhs", yyrhs,
- ritem[0], 1, yyrhs_size);
- XFREE (yyrhs);
+ /* Finish table and store. */
+ obstack_1grow (&format_obstack, 0);
+ muscle_insert ("tname", obstack_finish (&format_obstack));
}
- if (!semantic_parser && !no_parser_flag)
- obstack_grow_literal_string (&table_obstack, "\n#endif\n");
-}
-
-
-static void
-output_stos (void)
-{
- output_short_table (&table_obstack, NULL, "yystos", accessing_symbol,
- 0, 1, nstates);
-}
-
-
-static void
-output_rule_data (void)
-{
- int i;
- int j;
- short *short_tab = NULL;
-
- obstack_grow_literal_string (&table_obstack, "\n\
-#if YYDEBUG != 0\n");
-
- output_short_table (&table_obstack,
- "YYRLINE[YYN] -- source line where rule number YYN was defined",
- "yyrline", rline,
- 0, 1, nrules + 1);
-
- obstack_grow_literal_string (&table_obstack, "#endif\n\n");
-
- if (token_table_flag || no_parser_flag)
- {
- obstack_fgrow1 (&table_obstack, "#define YYNTOKENS %d\n", ntokens);
- obstack_fgrow1 (&table_obstack, "#define YYNNTS %d\n", nvars);
- obstack_fgrow1 (&table_obstack, "#define YYNRULES %d\n", nrules);
- obstack_fgrow1 (&table_obstack, "#define YYNSTATES %d\n", nstates);
- obstack_fgrow1 (&table_obstack, "#define YYMAXUTOK %d\n\n",
- max_user_token_number);
- }
-
- /* Output the table of symbol names. */
- if (!token_table_flag && !no_parser_flag)
- obstack_grow_literal_string (&table_obstack,
- "\n#if YYDEBUG != 0 || defined YYERROR_VERBOSE\n\n");
- obstack_grow_literal_string (&table_obstack, "\
-/* YYTNAME[TOKEN_NUM] -- String name of the token TOKEN_NUM. */\n");
- obstack_grow_literal_string (&table_obstack,
- "static const char *const yytname[] =\n{\n ");
-
- 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_grow_literal_string (&table_obstack, "\n ");
- j = 2;
- }
-
- obstack_1grow (&table_obstack, '\"');
- for (p = tags[i]; p && *p; p++)
- {
- if (*p == '"' || *p == '\\')
- {
- obstack_fgrow1 (&table_obstack, "\\%c", *p);
- }
- else if (*p == '\n')
- {
- obstack_grow_literal_string (&table_obstack, "\\n");
- }
- else if (*p == '\t')
- {
- obstack_grow_literal_string (&table_obstack, "\\t");
- }
- else if (*p == '\b')
- {
- obstack_grow_literal_string (&table_obstack, "\\b");
- }
- else if (*p < 040 || *p >= 0177)
- {
- obstack_fgrow1 (&table_obstack, "\\%03o", *p);
- }
- else
- {
- obstack_1grow (&table_obstack, *p);
- }
- }
-
- obstack_grow_literal_string (&table_obstack, "\", ");
- j += strsize;
- }
- /* add a NULL entry to list of tokens */
- obstack_grow_literal_string (&table_obstack, "NULL\n};\n");
-
- if (!token_table_flag && !no_parser_flag)
- obstack_grow_literal_string (&table_obstack, "#endif\n\n");
-
/* Output YYTOKNUM. */
- if (token_table_flag)
- {
- output_short_table (&table_obstack,
- "YYTOKNUM[YYLEX] -- Index in YYTNAME corresponding to YYLEX",
- "yytoknum", user_toknums,
- 0, 1, ntokens + 1);
- }
-
- /* Output YYR1. */
- output_short_table (&table_obstack,
- "YYR1[YYN] -- Symbol number of symbol that rule YYN derives",
- "yyr1", rlhs,
- 0, 1, nrules + 1);
- XFREE (rlhs + 1);
-
- obstack_1grow (&table_obstack, '\n');
-
- /* Output YYR2. */
- short_tab = XMALLOC (short, nrules + 1);
- for (i = 1; i < nrules; i++)
- short_tab[i] = rrhs[i + 1] - rrhs[i] - 1;
- short_tab[nrules] = nitems - rrhs[nrules] - 1;
- output_short_table (&table_obstack,
- "YYR2[YYN] -- Number of symbols composing right hand side of rule YYN",
- "yyr2", short_tab,
- 0, 1, nrules + 1);
- obstack_1grow (&table_obstack, '\n');
-
- XFREE (short_tab);
-
- XFREE (rrhs + 1);
-}
-
-
-static void
-output_defines (void)
-{
- obstack_fgrow1 (&table_obstack, "\n\n#define\tYYFINAL\t\t%d\n", final_state);
- obstack_fgrow1 (&table_obstack, "#define\tYYFLAG\t\t%d\n", MINSHORT);
- obstack_fgrow1 (&table_obstack, "#define\tYYNTBASE\t%d\n", ntokens);
+ {
+ int i;
+ int *values = xnmalloc (ntokens, sizeof *values);
+ 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);
+ }
}
-/*------------------------------------------------------------------.
-| 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 count;
- int default_rule;
- int nreds;
- int max;
- int rule;
- int shift_state;
- int symbol;
- unsigned mask;
- unsigned *wordp;
- 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 = reduction_table[state];
-
- if (redp)
- {
- nreds = redp->nreds;
-
- if (nreds >= 1)
- {
- /* loop over all the rules available here which require
- lookahead */
- m = lookaheads[state];
- n = lookaheads[state + 1];
-
- for (i = n - 1; i >= m; i--)
- {
- rule = -LAruleno[i];
- wordp = LA + i * tokensetsize;
- mask = 1;
-
- /* 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 (mask & *wordp)
- actrow[j] = rule;
-
- mask <<= 1;
- if (mask == 0)
- {
- mask = 1;
- wordp++;
- }
- }
- }
- }
- }
-
- shiftp = shift_table[state];
-
- /* 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. */
-
- if (shiftp)
- {
- k = shiftp->nshifts;
-
- for (i = 0; i < k; i++)
- {
- shift_state = shiftp->shifts[i];
- if (!shift_state)
- continue;
-
- symbol = accessing_symbol[shift_state];
-
- 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;
- }
- }
-
- errp = err_table[state];
-
- /* See which tokens are an explicit error in this state (due to
- %nonassoc). For them, record MINSHORT as the action. */
-
- 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 (consistent[state])
- default_rule = redp->rules[0];
- else
- {
- max = 0;
- for (i = m; i < n; i++)
- {
- 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 r;
+ unsigned int i = 0;
+ item_number *rhs = xnmalloc (nritems, sizeof *rhs);
+ unsigned int *prhs = xnmalloc (nrules, sizeof *prhs);
+ unsigned int *rline = xnmalloc (nrules, sizeof *rline);
+ symbol_number *r1 = xnmalloc (nrules, sizeof *r1);
+ unsigned int *r2 = xnmalloc (nrules, sizeof *r2);
+ int *dprec = xnmalloc (nrules, sizeof *dprec);
+ int *merger = xnmalloc (nrules, sizeof *merger);
+
+ for (r = 0; r < nrules; ++r)
{
- if (actrow[i] != 0)
- {
- *sp1++ = i;
- *sp2++ = actrow[i];
- }
+ item_number *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.start.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;
+ aver (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_int_table ("dprec", dprec, 0, 0, nrules);
+ muscle_insert_int_table ("merger", merger, 0, 0, nrules);
+
+ MUSCLE_INSERT_INT ("rules_number", nrules);
+ MUSCLE_INSERT_INT ("max_left_semantic_context", max_left_semantic_context);
+
+ 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 i;
+ symbol_number *values = xnmalloc (nstates, sizeof *values);
for (i = 0; i < nstates; ++i)
- {
- yydefact[i] = action_row (i);
- save_row (i);
- }
- XFREE (actrow);
-
- output_short_table (&table_obstack,
- "YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE\n\
- doesn't specify something else to do. Zero means the default is an\n\
- error",
- "yydefact", yydefact,
- yydefact[0], 1, nstates);
- obstack_1grow (&table_obstack, '\n');
- XFREE (yydefact);
+ values[i] = states[i]->accessing_symbol;
+ muscle_insert_symbol_number_table ("stos", values,
+ 0, 1, nstates);
+ free (values);
+
+ MUSCLE_INSERT_INT ("last", high);
+ MUSCLE_INSERT_INT ("final_state_number", final_state->number);
+ MUSCLE_INSERT_INT ("states_number", nstates);
}
-static void
-free_shifts (void)
-{
- shifts *sp, *sptmp; /* JF derefrenced freed ptr */
-
- XFREE (shift_table);
-
- for (sp = first_shift; sp; sp = sptmp)
- {
- sptmp = sp->next;
- XFREE (sp);
- }
-}
+/*---------------------------------.
+| Output the user actions to OUT. |
+`---------------------------------*/
static void
-free_reductions (void)
+user_actions_output (FILE *out)
{
- reductions *rp, *rptmp; /* JF fixed freed ptr */
+ rule_number r;
- XFREE (reduction_table);
-
- for (rp = first_reduction; rp; rp = rptmp)
- {
- rptmp = rp->next;
- XFREE (rp);
- }
+ fputs ("m4_define([b4_actions], \n[", out);
+ for (r = 0; r < nrules; ++r)
+ if (rules[r].action)
+ {
+ fprintf (out, "b4_case(%d, [b4_syncline(%d, ", r + 1,
+ rules[r].action_location.start.line);
+ escaped_output (out, rules[r].action_location.start.file);
+ fprintf (out, ")\n[ %s]])\n\n", rules[r].action);
+ }
+ fputs ("])\n\n", out);
}
-
+/*--------------------------------------.
+| Output the merge functions to OUT. |
+`--------------------------------------*/
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;
-
- 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)
+merger_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;
-
- for (i = 0; i < nstates; i++)
- state_count[i] = 0;
-
- for (i = m; i < n; i++)
- state_count[to_state[i]]++;
+ merger_list* p;
- max = 0;
- default_state = -1;
-
- for (i = 0; i < nstates; i++)
+ fputs ("m4_define([b4_mergers], \n[[", out);
+ for (n = 1, p = merge_functions; p != NULL; n += 1, p = p->next)
{
- if (state_count[i] > max)
- {
- max = state_count[i];
- default_state = i;
- }
+ if (p->type[0] == '\0')
+ fprintf (out, " case %d: *yy0 = %s (*yy0, *yy1); break;\n",
+ n, p->name);
+ else
+ fprintf (out, " case %d: yy0->%s = %s (*yy0, *yy1); break;\n",
+ n, p->type, p->name);
}
-
- return default_state;
+ 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 tokens definition to OUT. |
+`--------------------------------------*/
static void
-goto_actions (void)
+token_definitions_output (FILE *out)
{
int i;
+ char const *sep = "";
- short *yydefgoto = XMALLOC (short, nsyms - ntokens);
- state_count = XCALLOC (short, nstates);
-
- for (i = ntokens; i < nsyms; ++i)
+ fputs ("m4_define([b4_tokens], \n[", out);
+ for (i = 0; i < ntokens; ++i)
{
- int default_state = default_goto (i);
- save_column (i, default_state);
- yydefgoto[i - ntokens] = default_state;
+ symbol *sym = symbols[i];
+ int number = sym->user_token_number;
+
+ /* At this stage, if there are literal aliases, they are part of
+ SYMBOLS, so we should not find symbols which are the aliases
+ here. */
+ aver (number != USER_NUMBER_ALIAS);
+
+ /* Skip error token. */
+ if (sym == errtoken)
+ continue;
+
+ /* If this string has an alias, then it is necessarily the alias
+ which is to be output. */
+ if (sym->alias)
+ sym = sym->alias;
+
+ /* 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 (sym->tag[0] == '\'' || sym->tag[0] == '\"')
+ continue;
+
+ /* Don't #define nonliteral tokens whose names contain periods
+ or '$' (as does the default value of the EOF token). */
+ if (strchr (sym->tag, '.') || strchr (sym->tag, '$'))
+ continue;
+
+ fprintf (out, "%s[[[%s]], %d]",
+ sep, sym->tag, number);
+ sep = ",\n";
}
-
- output_short_table (&table_obstack, NULL, "yydefgoto", yydefgoto,
- yydefgoto[0], 1, nsyms - ntokens);
-
- 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 symbol destructors or printers to OUT. |
+`---------------------------------------------------*/
static void
-sort_actions (void)
+symbol_code_props_output (FILE *out, char const *what,
+ code_props const *(*get)(symbol const *))
{
int i;
- int j;
- int k;
- int t;
- int w;
-
- order = XCALLOC (short, nvectors);
- nentries = 0;
+ char const *sep = "";
- for (i = 0; i < nvectors; i++)
+ fputs ("m4_define([b4_symbol_", out);
+ fputs (what, out);
+ fputs ("], \n[", out);
+ for (i = 0; i < nsyms; ++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--;
-
- for (k = nentries - 1; k > j; k--)
- order[k + 1] = order[k];
-
- order[j + 1] = i;
- nentries++;
- }
+ symbol *sym = symbols[i];
+ char const *code = (*get) (sym)->code;
+ if (code)
+ {
+ location loc = (*get) (sym)->location;
+ /* Filename, lineno,
+ Symbol-name, Symbol-number,
+ code, optional typename. */
+ fprintf (out, "%s[", sep);
+ sep = ",\n";
+ escaped_output (out, loc.start.file);
+ fprintf (out, ", %d, ", loc.start.line);
+ escaped_output (out, sym->tag);
+ fprintf (out, ", %d, [[%s]]", sym->number, code);
+ if (sym->type_name)
+ fprintf (out, ", [[%s]]", sym->type_name);
+ fputc (']', out);
+ }
}
+ fputs ("])\n\n", out);
}
-static int
-matching_state (int vector)
-{
- int i;
- int j;
- int k;
- int t;
- int w;
- int match;
- int prev;
-
- i = order[vector];
- if (i >= nstates)
- return -1;
-
- t = tally[i];
- w = width[i];
-
- 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;
- }
-
- return -1;
-}
-
-
-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 */
-}
-
-
-static void
-pack_table (void)
-{
- 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;
-
- 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);
-}
-
-/* the following functions output yytable, yycheck
- and the vectors whose elements index the portion starts */
-
-static void
-output_base (void)
-{
- output_short_table (&table_obstack, NULL, "yypact", base,
- base[0], 1, nstates);
-
- obstack_1grow (&table_obstack, '\n');
-
- output_short_table (&table_obstack, NULL, "yypgoto", base,
- base[nstates], nstates + 1, nvectors);
-
- XFREE (base);
-}
-
-
-static void
-output_table (void)
-{
- obstack_fgrow1 (&table_obstack, "\n\n#define\tYYLAST\t\t%d\n\n\n", high);
- output_short_table (&table_obstack, NULL, "yytable", table,
- table[0], 1, high + 1);
- XFREE (table);
-}
-
-
-static void
-output_check (void)
-{
- output_short_table (&table_obstack, NULL, "yycheck", check,
- check[0], 1, high + 1);
- XFREE (check);
-}
-
-/* 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 ();
- free_shifts ();
- free_reductions ();
- XFREE (lookaheads);
- XFREE (LA);
- XFREE (LAruleno);
- XFREE (accessing_symbol);
-
- goto_actions ();
- XFREE (goto_map + ntokens);
- XFREE (from_state);
- XFREE (to_state);
-
- sort_actions ();
- pack_table ();
- obstack_1grow (&table_obstack, '\n');
- output_base ();
- output_table ();
- obstack_1grow (&table_obstack, '\n');
- output_check ();
+ /* 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,
+ 0, 1, conflict_list_cnt);
}
-/*------------------------------------------.
-| Copy the parser code into TABLE_OBSTACK. |
-`------------------------------------------*/
+\f
+/*---------------------------.
+| Call the skeleton parser. |
+`---------------------------*/
static void
-output_parser (void)
+output_skeleton (void)
{
- int c;
- static int number_of_dollar_signs = 0;
- FILE *fskel;
-
- if (pure_parser)
- obstack_grow_literal_string (&table_obstack, "#define YYPURE 1\n\n");
-
- /* Loop over lines in the standard parser file. */
- if (semantic_parser)
- fskel = xfopen (skeleton_find ("BISON_HAIRY", BISON_HAIRY), "r");
+ FILE *in;
+ FILE *out;
+ int filter_fd[2];
+ char const *argv[9];
+ pid_t pid;
+
+ /* Compute the names of the package data dir and skeleton files. */
+ char const m4sugar[] = "m4sugar/m4sugar.m4";
+ char const m4bison[] = "bison.m4";
+ char *full_m4sugar;
+ char *full_m4bison;
+ char *full_skeleton;
+ char const *p;
+ char const *m4 = (p = getenv ("M4")) ? p : M4;
+ char const *pkgdatadir = compute_pkgdatadir ();
+ size_t skeleton_size = strlen (skeleton) + 1;
+ size_t pkgdatadirlen = strlen (pkgdatadir);
+ while (pkgdatadirlen && pkgdatadir[pkgdatadirlen - 1] == '/')
+ pkgdatadirlen--;
+ full_skeleton = xmalloc (pkgdatadirlen + 1
+ + (skeleton_size < sizeof m4sugar
+ ? sizeof m4sugar : skeleton_size));
+ strncpy (full_skeleton, pkgdatadir, pkgdatadirlen);
+ full_skeleton[pkgdatadirlen] = '/';
+ strcpy (full_skeleton + pkgdatadirlen + 1, m4sugar);
+ full_m4sugar = xstrdup (full_skeleton);
+ strcpy (full_skeleton + pkgdatadirlen + 1, m4bison);
+ full_m4bison = xstrdup (full_skeleton);
+ if (strchr (skeleton, '/'))
+ strcpy (full_skeleton, skeleton);
else
- fskel = xfopen (skeleton_find ("BISON_SIMPLE", BISON_SIMPLE), "r");
+ strcpy (full_skeleton + pkgdatadirlen + 1, skeleton);
- while (1)
- {
- int write_line = 1;
+ /* Test whether m4sugar.m4 is readable, to check for proper
+ installation. A faulty installation can cause deadlock, so a
+ cheap sanity check is worthwhile. */
+ xfclose (xfopen (full_m4sugar, "r"));
- c = getc (fskel);
+ /* Create an m4 subprocess connected to us via two pipes. */
- /* See if the line starts with `#line.
- If so, set write_line to 0. */
- if (no_lines_flag)
- if (c == '#')
- {
- c = getc (fskel);
- if (c == 'l')
- {
- c = getc (fskel);
- if (c == 'i')
- {
- c = getc (fskel);
- if (c == 'n')
- {
- c = getc (fskel);
- if (c == 'e')
- write_line = 0;
- else
- obstack_grow_literal_string (&table_obstack, "#lin");
- }
- else
- obstack_grow_literal_string (&table_obstack, "#li");
- }
- else
- obstack_grow_literal_string (&table_obstack, "#l");
- }
- else
- obstack_grow_literal_string (&table_obstack, "#");
- }
-
- /* now write out the line... */
- for (; c != '\n' && c != EOF; c = getc (fskel))
- if (write_line)
- {
- /* `$' in the parser file indicates where to put the
- actions. Copy them in at this point. */
- if (c == '$')
- {
- size_t size = obstack_object_size (&action_obstack);
-
- number_of_dollar_signs++;
- assert (number_of_dollar_signs == 1);
- obstack_grow (&table_obstack,
- obstack_finish (&action_obstack),
- size);
-
- /* Skip the end of the line containing `$'. */
- write_line = 0;
- }
- else
- obstack_1grow (&table_obstack, c);
- }
- if (c == EOF)
- break;
- obstack_1grow (&table_obstack, c);
- }
- assert (number_of_dollar_signs == 1);
- xfclose (fskel);
-}
-
-static void
-output_program (void)
-{
- int c;
+ if (trace_flag & trace_tools)
+ fprintf (stderr, "running: %s %s - %s %s\n",
+ m4, full_m4sugar, full_m4bison, full_skeleton);
- if (!no_lines_flag)
- obstack_fgrow2 (&table_obstack, "#line %d %s\n",
- lineno, quotearg_style (c_quoting_style, infile));
+ /* Some future version of GNU M4 (most likely 1.6) may treat the -dV in a
+ position-dependent manner. Keep it as the first argument so that all
+ files are traced.
- while ((c = getc (finput)) != EOF)
- obstack_1grow (&table_obstack, c);
+ See the thread starting at
+ <http://lists.gnu.org/archive/html/bug-bison/2008-07/msg00000.html>
+ for details. */
+ {
+ int i = 0;
+ argv[i++] = m4;
+ argv[i++] = "-I";
+ argv[i++] = pkgdatadir;
+ if (trace_flag & trace_m4)
+ argv[i++] = "-dV";
+ argv[i++] = full_m4sugar;
+ argv[i++] = "-";
+ argv[i++] = full_m4bison;
+ argv[i++] = full_skeleton;
+ argv[i++] = NULL;
+ }
+ /* When POSIXLY_CORRECT is set, some future versions of GNU M4 (most likely
+ 2.0) may drop some of the GNU extensions that Bison's skeletons depend
+ upon. So that the next release of Bison is forward compatible with those
+ future versions of GNU M4, we unset POSIXLY_CORRECT here.
+
+ FIXME: A user might set POSIXLY_CORRECT to affect processes run from
+ macros like m4_syscmd in a custom skeleton. For now, Bison makes no
+ promises about the behavior of custom skeletons, so this scenario is not a
+ concern. However, we eventually want to eliminate this shortcoming. The
+ next release of GNU M4 (1.4.12 or 1.6) will accept the -g command-line
+ option as a no-op, and later releases will accept it to indicate that
+ POSIXLY_CORRECT should be ignored. Once the GNU M4 versions that accept
+ -g are pervasive, Bison should use -g instead of unsetting
+ POSIXLY_CORRECT.
+
+ See the thread starting at
+ <http://lists.gnu.org/archive/html/bug-bison/2008-07/msg00000.html>
+ for details. */
+ unsetenv ("POSIXLY_CORRECT");
+ init_subpipe ();
+ pid = create_subpipe (argv, filter_fd);
+ free (full_m4sugar);
+ free (full_m4bison);
+ free (full_skeleton);
+
+ out = fdopen (filter_fd[0], "w");
+ if (! out)
+ error (EXIT_FAILURE, get_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_code_props_output (out, "destructors", &symbol_destructor_get);
+ symbol_code_props_output (out, "printers", &symbol_printer_get);
+
+ muscles_m4_output (out);
+ xfclose (out);
+
+ /* Read and process m4's output. */
+ timevar_push (TV_M4);
+ end_of_output_subpipe (pid, filter_fd);
+ in = fdopen (filter_fd[1], "r");
+ if (! in)
+ error (EXIT_FAILURE, get_errno (),
+ "fdopen");
+ scan_skel (in);
+ xfclose (in);
+ reap_subpipe (pid, m4);
+ timevar_pop (TV_M4);
}
-
static void
-free_itemsets (void)
+prepare (void)
{
- core *cp, *cptmp;
-
- XFREE (state_table);
+ /* BISON_USE_PUSH_FOR_PULL is for the test suite and should not be documented
+ for the user. */
+ char const *use_push_for_pull_env = getenv ("BISON_USE_PUSH_FOR_PULL");
+ bool use_push_for_pull_flag = false;
+ if (use_push_for_pull_env != NULL
+ && use_push_for_pull_env[0] != '\0'
+ && 0 != strcmp (use_push_for_pull_env, "0"))
+ use_push_for_pull_flag = true;
+
+ /* Flags. */
+ MUSCLE_INSERT_BOOL ("debug_flag", debug_flag);
+ MUSCLE_INSERT_BOOL ("defines_flag", defines_flag);
+ MUSCLE_INSERT_BOOL ("error_verbose_flag", error_verbose);
+ MUSCLE_INSERT_BOOL ("glr_flag", glr_parser);
+ MUSCLE_INSERT_BOOL ("locations_flag", locations_flag);
+ MUSCLE_INSERT_BOOL ("nondeterministic_flag", nondeterministic_parser);
+ MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);
+ MUSCLE_INSERT_BOOL ("tag_seen_flag", tag_seen);
+ MUSCLE_INSERT_BOOL ("use_push_for_pull_flag", use_push_for_pull_flag);
+ MUSCLE_INSERT_BOOL ("yacc_flag", yacc_flag);
+
+ /* File names. */
+ if (spec_name_prefix)
+ MUSCLE_INSERT_STRING ("prefix", spec_name_prefix);
+
+ MUSCLE_INSERT_STRING ("file_name_all_but_ext", all_but_ext);
+
+#define DEFINE(Name) MUSCLE_INSERT_STRING (#Name, Name ? Name : "")
+ DEFINE (dir_prefix);
+ DEFINE (parser_file_name);
+ DEFINE (spec_defines_file);
+ DEFINE (spec_file_prefix);
+ DEFINE (spec_graph_file);
+ DEFINE (spec_name_prefix);
+ DEFINE (spec_outfile);
+ DEFINE (spec_verbose_file);
+#undef DEFINE
+
+ /* Find the right skeleton file, and add muscles about the skeletons. */
+ if (skeleton)
+ MUSCLE_INSERT_C_STRING ("skeleton", skeleton);
+ else
+ skeleton = language->skeleton;
- for (cp = first_state; cp; cp = cptmp)
- {
- cptmp = cp->next;
- XFREE (cp);
- }
+ /* About the skeletons. */
+ {
+ /* b4_pkgdatadir is used inside m4_include in the skeletons, so digraphs
+ would never be expanded. Hopefully no one has M4-special characters in
+ his Bison installation path. */
+ MUSCLE_INSERT_STRING_RAW ("pkgdatadir", compute_pkgdatadir ());
+ }
}
void
output (void)
{
- /* output_token_defines(ftable); / * JF put out token defines FIRST */
+ obstack_init (&format_obstack);
- /* If using a simple parser the definition of YYSTYPE are put into
- TABLE_OBSTACK. */
- if (!semantic_parser)
- {
- size_t size = obstack_object_size (&attrs_obstack);
- obstack_grow (&table_obstack, obstack_finish (&attrs_obstack), size);
- }
- reader_output_yylsp (&table_obstack);
- if (debug_flag)
- obstack_grow_literal_string (&table_obstack, "\
-#ifndef YYDEBUG\n\
-# define YYDEBUG 1\n\
-#endif\n\
-\n");
-
- if (semantic_parser)
- obstack_fgrow1 (&table_obstack, "#include %s\n",
- quotearg_style (c_quoting_style, attrsfile));
-
- if (!no_parser_flag)
- obstack_grow_literal_string (&table_obstack, "#include <stdio.h>\n\n");
-
- /* Make "const" do nothing if not in ANSI C. */
- obstack_grow_literal_string (&table_obstack, "\
-#ifndef __cplusplus\n\
-# ifndef __STDC__\n\
-# define const\n\
-# endif\n\
-#endif\n\
-\n");
-
- free_itemsets ();
- output_defines ();
- output_token_translations ();
-/* if (semantic_parser) */
- /* This is now unconditional because debugging printouts can use it. */
- output_gram ();
- XFREE (ritem);
- if (semantic_parser)
- output_stos ();
- output_rule_data ();
- output_actions ();
- if (!no_parser_flag)
- output_parser ();
- output_program ();
+ prepare_symbols ();
+ prepare_rules ();
+ prepare_states ();
+ prepare_actions ();
+
+ prepare ();
+
+ /* Process the selected skeleton file. */
+ output_skeleton ();
+
+ obstack_free (&format_obstack, NULL);
+}
+
+char const *
+compute_pkgdatadir (void)
+{
+ char const *pkgdatadir = getenv ("BISON_PKGDATADIR");
+ return pkgdatadir ? pkgdatadir : PKGDATADIR;
}
projects / bison.git / blobdiff