X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/4c3cc7da5d1f1ff197e00de9c0cc7b76edee852d..d27c5e6534e7ee2fc402ae0d0b59d6316a9da2ad:/src/output.c diff --git a/src/output.c b/src/output.c index 5950b4f7..c227be22 100644 --- a/src/output.c +++ b/src/output.c @@ -1,7 +1,7 @@ /* 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. + Copyright (C) 1984, 1986, 1989, 1992, 2000-2012 Free Software + Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -21,18 +21,20 @@ #include #include "system.h" +#include #include -#include +#include #include #include -#include +#include #include +#include #include "complain.h" #include "files.h" #include "getargs.h" #include "gram.h" -#include "muscle_tab.h" +#include "muscle-tab.h" #include "output.h" #include "reader.h" #include "scan-code.h" /* max_left_semantic_context */ @@ -40,7 +42,6 @@ #include "symtab.h" #include "tables.h" - static struct obstack format_obstack; @@ -52,51 +53,51 @@ static struct obstack format_obstack; `-------------------------------------------------------------------*/ -#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); \ +#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); \ } GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_unsigned_int_table, unsigned int) @@ -104,33 +105,42 @@ 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) -/*--------------------------------------------------------------------. -| Print to OUT a representation of STRING escaped both for C and M4. | -`--------------------------------------------------------------------*/ +/*----------------------------------------------------------------. +| Print to OUT a representation of CP quoted and escaped for M4. | +`----------------------------------------------------------------*/ static void -escaped_output (FILE *out, char const *string) +quoted_output (FILE *out, char const *cp) { - char const *p; fprintf (out, "[["); - for (p = quotearg_style (c_quoting_style, string); *p; p++) - switch (*p) + for (; *cp; cp++) + switch (*cp) { case '$': fputs ("$][", out); break; case '@': fputs ("@@", out); break; case '[': fputs ("@{", out); break; case ']': fputs ("@}", out); break; - default: fputc (*p, out); break; + default: fputc (*cp, out); break; } fprintf (out, "]]"); } +/*----------------------------------------------------------------. +| Print to OUT a representation of STRING quoted and escaped both | +| for C and M4. | +`----------------------------------------------------------------*/ + +static void +string_output (FILE *out, char const *string) +{ + quoted_output (out, quotearg_style (c_quoting_style, string)); +} + /*------------------------------------------------------------------. | Prepare the muscles related to the symbols: translate, tname, and | @@ -140,7 +150,6 @@ escaped_output (FILE *out, char const *string) static void prepare_symbols (void) { - MUSCLE_INSERT_BOOL ("token_table", token_table_flag); MUSCLE_INSERT_INT ("tokens_number", ntokens); MUSCLE_INSERT_INT ("nterms_number", nvars); MUSCLE_INSERT_INT ("symbols_number", nsyms); @@ -148,9 +157,9 @@ prepare_symbols (void) 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); + token_translations, + token_translations[0], + 1, max_user_token_number + 1); /* tname -- token names. */ { @@ -162,23 +171,23 @@ prepare_symbols (void) 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; - - if (j + width > 75) - { - obstack_sgrow (&format_obstack, "\n "); - j = 1; - } - - if (i) - obstack_1grow (&format_obstack, ' '); - MUSCLE_OBSTACK_SGROW (&format_obstack, cp); + 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; + + if (j + width > 75) + { + obstack_sgrow (&format_obstack, "\n "); + j = 1; + } + + if (i) + obstack_1grow (&format_obstack, ' '); + obstack_escape (&format_obstack, cp); free (cp); - obstack_1grow (&format_obstack, ','); - j += width; + obstack_1grow (&format_obstack, ','); + j += width; } free (qo); obstack_sgrow (&format_obstack, " ]b4_null["); @@ -195,71 +204,60 @@ prepare_symbols (void) for (i = 0; i < ntokens; ++i) values[i] = symbols[i]->user_token_number; muscle_insert_int_table ("toknum", values, - values[0], 1, ntokens); + values[0], 1, ntokens); free (values); } } -/*-------------------------------------------------------------. -| Prepare the muscles related to the rules: rhs, prhs, r1, r2, | -| rline, dprec, merger. | -`-------------------------------------------------------------*/ +/*----------------------------------------------------------------. +| Prepare the muscles related to the rules: r1, r2, rline, dprec, | +| merger, immediate. | +`----------------------------------------------------------------*/ static void prepare_rules (void) { - 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); + int *immediate = xnmalloc (nrules, sizeof *immediate); + rule_number r; for (r = 0; r < nrules; ++r) { - 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; + r2[r] = rule_rhs_length(&rules[r]); /* 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; + /* Immediate reduction flags (GLR). */ + immediate[r] = rules[r].is_predicate; } - 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_table ("immediate", immediate, 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); + free (immediate); } /*--------------------------------------------. @@ -274,7 +272,7 @@ prepare_states (void) for (i = 0; i < nstates; ++i) values[i] = states[i]->accessing_symbol; muscle_insert_symbol_number_table ("stos", values, - 0, 1, nstates); + 0, 1, nstates); free (values); MUSCLE_INSERT_INT ("last", high); @@ -287,7 +285,7 @@ prepare_states (void) | Compare two symbols by type-name, and then by number. | `-------------------------------------------------------*/ -int +static int symbol_type_name_cmp (const symbol **lhs, const symbol **rhs) { int res = UNIQSTR_CMP((*lhs)->type_name, (*rhs)->type_name); @@ -302,7 +300,7 @@ symbol_type_name_cmp (const symbol **lhs, const symbol **rhs) `----------------------------------------------------------------*/ static symbol ** -symbols_by_type_name () +symbols_by_type_name (void) { typedef int (*qcmp_type) (const void *, const void *); symbol **res = xmemdup (symbols, nsyms * sizeof *res); @@ -320,28 +318,17 @@ static void type_names_output (FILE *out) { int i; - const char *isep = ""; symbol **syms = symbols_by_type_name (); fputs ("m4_define([b4_type_names],\n[", out); - for (i = 0; i < nsyms; ) - if (syms[i]->type_name) - { - int j; - const char *jsep = ""; - fprintf (out, "%s[", isep); - isep = ",\n"; - for (j = i; j < nsyms; ++j) - { - if (syms[i]->type_name != syms[j]->type_name) - break; - fprintf (out, "%s%d", jsep, syms[j]->number); - jsep = ", "; - } - fputs ("]", out); - i = j; - } - else - ++i; + for (i = 0; i < nsyms; /* nothing */) + { + // The index of the first symbol of the current type-name. + int i0 = i; + fputs (i ? ",\n[" : "[", out); + for (; i < nsyms && syms[i]->type_name == syms[i0]->type_name; ++i) + fprintf (out, "%s%d", i != i0 ? ", " : "", syms[i]->number); + fputs ("]", out); + } fputs ("])\n\n", out); free (syms); } @@ -375,10 +362,11 @@ user_actions_output (FILE *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); + fprintf (out, "b4_%scase(%d, [b4_syncline(%d, ", + rules[r].is_predicate ? "predicate_" : "", + r + 1, rules[r].action_location.start.line); + string_output (out, rules[r].action_location.start.file); + fprintf (out, ")\n[ %s]])\n\n", rules[r].action); } fputs ("])\n\n", out); } @@ -397,139 +385,100 @@ merger_output (FILE *out) for (n = 1, p = merge_functions; p != NULL; n += 1, p = p->next) { if (p->type[0] == '\0') - fprintf (out, " case %d: *yy0 = %s (*yy0, *yy1); break;\n", - n, p->name); + 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); + fprintf (out, " case %d: yy0->%s = %s (*yy0, *yy1); break;\n", + n, p->type, p->name); } fputs ("]])\n\n", out); } -/*---------------------------------------. -| Output the symbol definitions to OUT. | -`---------------------------------------*/ +/*---------------------------------------------. +| Prepare the muscles for symbol definitions. | +`---------------------------------------------*/ static void -symbol_definitions_output (FILE *out) +prepare_symbol_definitions (void) { int i; for (i = 0; i < nsyms; ++i) { symbol *sym = symbols[i]; const char *key; + const char *value; + +#define SET_KEY(Entry) \ + obstack_fgrow2 (&format_obstack, "symbol(%d, %s)", \ + i, Entry); \ + obstack_1grow (&format_obstack, 0); \ + key = obstack_finish (&format_obstack); -#define SET_KEY(Entry) \ - obstack_fgrow2 (&format_obstack, "symbol(%d, %s)", i, Entry); \ - obstack_1grow (&format_obstack, 0); \ +#define SET_KEY2(Entry, Suffix) \ + obstack_fgrow3 (&format_obstack, "symbol(%d, %s_%s)", \ + i, Entry, Suffix); \ + obstack_1grow (&format_obstack, 0); \ key = obstack_finish (&format_obstack); + // Whether the symbol has an identifier. + value = symbol_id_get (sym); + SET_KEY("has_id"); + MUSCLE_INSERT_INT (key, !!value); + + // Its identifier. + SET_KEY("id"); + MUSCLE_INSERT_STRING (key, value ? value : ""); + + // Its tag. Typically for documentation purpose. SET_KEY("tag"); MUSCLE_INSERT_STRING (key, sym->tag); SET_KEY("user_number"); MUSCLE_INSERT_INT (key, sym->user_token_number); + SET_KEY("is_token"); + MUSCLE_INSERT_INT (key, + i < ntokens && sym != errtoken && sym != undeftoken); + SET_KEY("number"); MUSCLE_INSERT_INT (key, sym->number); - SET_KEY("type_name"); + SET_KEY("has_type"); + MUSCLE_INSERT_INT (key, !!sym->type_name); + + SET_KEY("type"); MUSCLE_INSERT_STRING (key, sym->type_name ? sym->type_name : ""); + { + int j; + for (j = 0; j < CODE_PROPS_SIZE; ++j) + { + /* "printer", not "%printer". */ + char const *pname = code_props_type_string (j) + 1; + code_props const *p = symbol_code_props_get (sym, j); + SET_KEY2("has", pname); + MUSCLE_INSERT_INT (key, !!p->code); + + if (p->code) + { + SET_KEY2(pname, "file"); + MUSCLE_INSERT_STRING (key, p->location.start.file); + + SET_KEY2(pname, "line"); + MUSCLE_INSERT_INT (key, p->location.start.line); + + SET_KEY(pname); + MUSCLE_INSERT_STRING_RAW (key, p->code); + } + } + } +#undef SET_KEY2 #undef SET_KEY } } -/*--------------------------------------. -| Output the tokens definition to OUT. | -`--------------------------------------*/ - -static void -token_definitions_output (FILE *out) -{ - int i; - char const *sep = ""; - - fputs ("m4_define([b4_tokens], \n[", out); - for (i = 0; i < ntokens; ++i) - { - 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"; - } - fputs ("])\n\n", out); -} - - -/*---------------------------------------------------. -| Output the symbol destructors or printers to OUT. | -`---------------------------------------------------*/ - -static void -symbol_code_props_output (FILE *out, char const *what, - code_props const *(*get)(symbol const *)) -{ - int i; - char const *sep = ""; - - fputs ("m4_define([b4_symbol_", out); - fputs (what, out); - fputs ("], \n[", out); - for (i = 0; i < nsyms; ++i) - { - 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 void prepare_actions (void) { @@ -537,30 +486,30 @@ prepare_actions (void) lookahead token type. */ muscle_insert_rule_number_table ("defact", yydefact, - yydefact[0], 1, nstates); + 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); + yydefgoto[0], 1, nsyms - ntokens); /* Output PACT. */ muscle_insert_base_table ("pact", base, - base[0], 1, nstates); + base[0], 1, nstates); MUSCLE_INSERT_INT ("pact_ninf", base_ninf); /* Output PGOTO. */ muscle_insert_base_table ("pgoto", base, - base[nstates], nstates + 1, nvectors); + base[nstates], nstates + 1, nvectors); muscle_insert_base_table ("table", table, - table[0], 1, high + 1); + table[0], 1, high + 1); MUSCLE_INSERT_INT ("table_ninf", table_ninf); muscle_insert_base_table ("check", check, - check[0], 1, high + 1); + check[0], 1, high + 1); /* GLR parsing slightly modifies YYTABLE and YYCHECK (and thus YYPACT) so that in states with unresolved conflicts, the default @@ -572,9 +521,9 @@ prepare_actions (void) 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); + conflict_table[0], 1, high + 1); muscle_insert_unsigned_int_table ("conflicting_rules", conflict_list, - 0, 1, conflict_list_cnt); + 0, 1, conflict_list_cnt); } @@ -587,11 +536,7 @@ muscles_output (FILE *out) { fputs ("m4_init()\n", out); merger_output (out); - symbol_code_props_output (out, "destructors", &symbol_destructor_get); - symbol_code_props_output (out, "printers", &symbol_printer_get); - symbol_definitions_output (out); symbol_numbers_output (out); - token_definitions_output (out); type_names_output (out); user_actions_output (out); // Must be last. @@ -605,48 +550,28 @@ muscles_output (FILE *out) static void output_skeleton (void) { - FILE *in; 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 - strcpy (full_skeleton + pkgdatadirlen + 1, skeleton); + char const *m4 = (m4 = getenv ("M4")) ? m4 : M4; + char const *datadir = pkgdatadir (); + char *m4sugar = xconcatenated_filename (datadir, "m4sugar/m4sugar.m4", NULL); + char *m4bison = xconcatenated_filename (datadir, "bison.m4", NULL); + char *skel = (IS_PATH_WITH_DIR (skeleton) + ? xstrdup (skeleton) + : xconcatenated_filename (datadir, skeleton, NULL)); /* 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")); + xfclose (xfopen (m4sugar, "r")); /* Create an m4 subprocess connected to us via two pipes. */ if (trace_flag & trace_tools) fprintf (stderr, "running: %s %s - %s %s\n", - m4, full_m4sugar, full_m4bison, full_skeleton); + m4, m4sugar, m4bison, skel); /* 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 @@ -656,88 +581,80 @@ output_skeleton (void) for details. */ { + char const *argv[10]; int i = 0; argv[i++] = m4; + + /* When POSIXLY_CORRECT is set, GNU M4 1.6 and later disable GNU + extensions, which Bison's skeletons depend on. With older M4, + it has no effect. M4 1.4.12 added a -g/--gnu command-line + option to make it explicit that a program wants GNU M4 + extensions even when POSIXLY_CORRECT is set. + + See the thread starting at + + for details. */ + if (*M4_GNU_OPTION) + argv[i++] = M4_GNU_OPTION; + argv[i++] = "-I"; - argv[i++] = pkgdatadir; + argv[i++] = datadir; if (trace_flag & trace_m4) argv[i++] = "-dV"; - argv[i++] = full_m4sugar; + argv[i++] = m4sugar; argv[i++] = "-"; - argv[i++] = full_m4bison; - argv[i++] = full_skeleton; + argv[i++] = m4bison; + argv[i++] = skel; argv[i++] = NULL; + aver (i <= ARRAY_CARDINALITY (argv)); + + /* The ugly cast is because gnulib gets the const-ness wrong. */ + pid = create_pipe_bidi ("m4", m4, (char **)(void*)argv, false, true, + true, filter_fd); } - /* 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 - - for details. */ - unsetenv ("POSIXLY_CORRECT"); - init_subpipe (); - pid = create_subpipe (argv, filter_fd); - free (full_m4sugar); - free (full_m4bison); - free (full_skeleton); + free (m4sugar); + free (m4bison); + free (skel); if (trace_flag & trace_muscles) muscles_output (stderr); { - FILE *out = fdopen (filter_fd[0], "w"); - if (! out) - error (EXIT_FAILURE, get_errno (), - "fdopen"); + FILE *out = xfdopen (filter_fd[1], "w"); muscles_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); + { + FILE *in = xfdopen (filter_fd[0], "r"); + scan_skel (in); + /* scan_skel should have read all of M4's output. Otherwise, when we + close the pipe, we risk letting M4 report a broken-pipe to the + Bison user. */ + aver (feof (in)); + xfclose (in); + } + wait_subprocess (pid, "m4", false, false, true, true, NULL); timevar_pop (TV_M4); } static void prepare (void) { - /* 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; + /* BISON_USE_PUSH_FOR_PULL is for the test suite and should not be + documented for the user. */ + char const *cp = getenv ("BISON_USE_PUSH_FOR_PULL"); + bool use_push_for_pull_flag = cp && *cp && strtol (cp, 0, 10); /* 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 ("token_table_flag", token_table_flag); MUSCLE_INSERT_BOOL ("use_push_for_pull_flag", use_push_for_pull_flag); MUSCLE_INSERT_BOOL ("yacc_flag", yacc_flag); @@ -769,7 +686,7 @@ prepare (void) /* 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 ()); + MUSCLE_INSERT_STRING_RAW ("pkgdatadir", pkgdatadir ()); } } @@ -787,6 +704,7 @@ output (void) prepare_rules (); prepare_states (); prepare_actions (); + prepare_symbol_definitions (); prepare (); @@ -797,8 +715,8 @@ output (void) } char const * -compute_pkgdatadir (void) +pkgdatadir (void) { - char const *pkgdatadir = getenv ("BISON_PKGDATADIR"); - return pkgdatadir ? pkgdatadir : PKGDATADIR; + char const *cp = getenv ("BISON_PKGDATADIR"); + return cp ? cp : PKGDATADIR; }