X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/640748eecf67130c80b5fd5f5cca19630eddf2b3..a932883e412c052a3b3542be333c3057ed1c0868:/src/output.c diff --git a/src/output.c b/src/output.c index 1ec4d6b0..da0d7852 100644 --- a/src/output.c +++ b/src/output.c @@ -1,4 +1,4 @@ -/* Output the generated parsing program for bison, +/* Output the generated parsing program for Bison. Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002 Free Software Foundation, Inc. @@ -20,218 +20,29 @@ 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 the original hard-coded value: SHRT_MAX - (yes, not USHRT_MAX). */ -static size_t table_size = SHRT_MAX; -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) - 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 | @@ -296,19 +107,49 @@ GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_item_number_table, item_number_t) GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number_t) -/*-----------------------------------------------------------------. -| Prepare the muscles related to the tokens: translate, tname, and | -| toknum. | -`-----------------------------------------------------------------*/ +/*----------------------------------------------------------------------. +| Print to OUT a representation of FILENAME escaped both for C and M4. | +`----------------------------------------------------------------------*/ static void -prepare_tokens (void) +escaped_file_name_output (FILE *out, char const *filename) { + char const *p; + fprintf (out, "[["); + + for (p = quotearg_style (c_quoting_style, filename); *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; + } + + fprintf (out, "]]"); +} + + +/*------------------------------------------------------------------. +| Prepare the muscles related to the symbols: translate, tname, and | +| toknum. | +`------------------------------------------------------------------*/ + +static 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; @@ -319,7 +160,7 @@ prepare_tokens (void) const char *cp = quotearg_n_style (1, c_quoting_style, symbols[i]->tag); - /* Width of the next token, including the two quotes, the coma + /* Width of the next token, including the two quotes, the comma and the space. */ int strsize = strlen (cp) + 2; @@ -329,7 +170,7 @@ prepare_tokens (void) j = 2; } - obstack_sgrow (&format_obstack, cp); + MUSCLE_OBSTACK_SGROW (&format_obstack, cp); obstack_sgrow (&format_obstack, ", "); j += strsize; } @@ -357,7 +198,7 @@ prepare_tokens (void) /*-------------------------------------------------------------. | Prepare the muscles related to the rules: rhs, prhs, r1, r2, | -| rline, dprec, merger | +| rline, dprec, merger. | `-------------------------------------------------------------*/ static void @@ -389,12 +230,13 @@ prepare_rules (void) rhs[i++] = -1; /* Line where rule was defined. */ rline[r] = rules[r].location.first_line; - /* Dynamic precedence (GLR) */ + /* Dynamic precedence (GLR). */ dprec[r] = rules[r].dprec; - /* Merger-function index (GLR) */ + /* Merger-function index (GLR). */ merger[r] = rules[r].merger; } - assert (i == nritems); + if (i != nritems) + abort (); muscle_insert_item_number_table ("rhs", rhs, ritem[0], 1, nritems); muscle_insert_unsigned_int_table ("prhs", prhs, 0, 0, nrules); @@ -404,6 +246,8 @@ prepare_rules (void) 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); @@ -427,287 +271,20 @@ prepare_states (void) 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; - } - } - } - - /* 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; - int nconflict = conflicts_total_count (); - - rule_number_t *yydefact = XCALLOC (rule_number_t, nstates); - - actrow = XCALLOC (action_t, ntokens); - conflrow = XCALLOC (unsigned int, ntokens); - - 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); - 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; @@ -717,11 +294,10 @@ actions_output (FILE *out) { fprintf (out, " case %d:\n", r + 1); - if (!no_lines_flag) - fprintf (out, muscle_find ("linef"), - rules[r].action_location.first_line, - quotearg_style (c_quoting_style, - muscle_find ("filename"))); + fprintf (out, "]b4_syncline([[%d]], ", + rules[r].action_location.first_line); + escaped_file_name_output (out, rules[r].action_location.file); + fprintf (out, ")[\n"); fprintf (out, " %s\n break;\n\n", rules[r].action); } @@ -751,11 +327,11 @@ merger_output (FILE *out) 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; @@ -770,7 +346,8 @@ token_definitions_output (FILE *out) /* 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); + if (number == USER_NUMBER_ALIAS) + abort (); /* Skip error token. */ if (symbol == errtoken) @@ -801,9 +378,9 @@ token_definitions_output (FILE *out) } -/*----------------------------------------. -| Output the symbol destructors to OOUT. | -`----------------------------------------*/ +/*---------------------------------------. +| Output the symbol destructors to OUT. | +`---------------------------------------*/ static void symbol_destructors_output (FILE *out) @@ -820,9 +397,11 @@ symbol_destructors_output (FILE *out) /* Filename, lineno, Symbol-name, Symbol-number, destructor, typename. */ - fprintf (out, "%s[[[%s]], [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]", - first ? "" : ",\n", - infile, symbol->destructor_location.first_line, + fprintf (out, "%s[", + first ? "" : ",\n"); + escaped_file_name_output (out, symbol->destructor_location.file); + fprintf (out, ", [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]", + symbol->destructor_location.first_line, symbol->tag, symbol->number, symbol->destructor, @@ -834,9 +413,9 @@ symbol_destructors_output (FILE *out) } -/*-------------------------------------. -| Output the symbol printers to OOUT. | -`-------------------------------------*/ +/*------------------------------------. +| Output the symbol printers to OUT. | +`------------------------------------*/ static void symbol_printers_output (FILE *out) @@ -852,10 +431,12 @@ symbol_printers_output (FILE *out) /* Filename, lineno, Symbol-name, Symbol-number, - destructor, typename. */ - fprintf (out, "%s[[[%s]], [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]", - first ? "" : ",\n", - infile, symbol->printer_location.first_line, + printer, typename. */ + fprintf (out, "%s[", + first ? "" : ",\n"); + escaped_file_name_output (out, symbol->printer_location.file); + fprintf (out, ", [[%d]], [[%s]], [[%d]], [[%s]], [[%s]]]", + symbol->printer_location.first_line, symbol->tag, symbol->number, symbol->printer, @@ -867,347 +448,22 @@ symbol_printers_output (FILE *out) } -/*------------------------------------------------------------------. -| 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); @@ -1216,94 +472,27 @@ output_base (void) /* 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); } @@ -1314,30 +503,60 @@ prepare_actions (void) 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); + xfclose (xfopen (full_path, "r")); + 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); @@ -1349,46 +568,30 @@ output_skeleton (void) fputs ("m4_divert_push(0)dnl\n", out); xfclose (out); - m4_invoke (tempfile); - - /* If `debugging', keep this file alive. */ - if (!trace_flag) - 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); + xfclose (in); + reap_subpipe (pid, m4); + timevar_pop (TV_M4); } static void prepare (void) { /* Flags. */ - MUSCLE_INSERT_INT ("locations_flag", locations_flag); + 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 ("debug", debug_flag); + 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. */ + /* File names. */ 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); - - /* 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); @@ -1406,7 +609,7 @@ prepare (void) } /* Parse the skeleton file and output the needed parsers. */ - muscle_insert ("skeleton", skeleton); + MUSCLE_INSERT_C_STRING ("skeleton", skeleton); } @@ -1419,7 +622,7 @@ output (void) { obstack_init (&format_obstack); - prepare_tokens (); + prepare_symbols (); prepare_rules (); prepare_states (); prepare_actions ();