X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/2935744b3a563ff41d9cc7e6c21ffb4e86767717..ca2a6d1587f421a6c58b9f80cc8d6b983c9a62dc:/src/output.c diff --git a/src/output.c b/src/output.c index 5afab69f..6b29e5c0 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. + 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -24,15 +24,16 @@ #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 */ @@ -40,6 +41,7 @@ #include "symtab.h" #include "tables.h" +# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array)) static struct obstack format_obstack; @@ -104,7 +106,6 @@ 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) @@ -143,6 +144,7 @@ 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); MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number); MUSCLE_INSERT_INT ("user_token_number_max", max_user_token_number); @@ -200,60 +202,48 @@ prepare_symbols (void) } -/*-------------------------------------------------------------. -| 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); @@ -282,28 +272,71 @@ prepare_states (void) } +/*-------------------------------------------------------. +| Compare two symbols by type-name, and then by number. | +`-------------------------------------------------------*/ + +static int +symbol_type_name_cmp (const symbol **lhs, const symbol **rhs) +{ + int res = UNIQSTR_CMP((*lhs)->type_name, (*rhs)->type_name); + if (res) + return res; + return (*lhs)->number - (*rhs)->number; +} + -/*-----------------------------------------------. -| For each symbol type, its tags and type name. | -`-----------------------------------------------*/ +/*----------------------------------------------------------------. +| Return a (malloc'ed) table of the symbols sorted by type-name. | +`----------------------------------------------------------------*/ + +static symbol ** +symbols_by_type_name (void) +{ + typedef int (*qcmp_type) (const void *, const void *); + symbol **res = xmemdup (symbols, nsyms * sizeof *res); + qsort (res, nsyms, sizeof *res, (qcmp_type) &symbol_type_name_cmp); + return res; +} + + +/*------------------------------------------------------------------. +| Define b4_type_names, which is a list of (lists of the numbers of | +| symbols with same type-name). | +`------------------------------------------------------------------*/ static void type_names_output (FILE *out) { int i; - + symbol **syms = symbols_by_type_name (); fputs ("m4_define([b4_type_names],\n[", out); - for (i = 0; i < nsyms; ++i) + for (i = 0; i < nsyms; /* nothing */) { - symbol *sym = symbols[i]; - /* Symbol-name, Symbol-number, optional typename. */ - fprintf (out, "%s[", i ? ",\n" : ""); - escaped_output (out, sym->tag); - fprintf (out, ", %d, [[%s]]]", - sym->number, - sym->type_name ? sym->type_name : ""); + // 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); +} + + +/*-------------------------------------. +| The list of all the symbol numbers. | +`-------------------------------------*/ + +static void +symbol_numbers_output (FILE *out) +{ + int i; + fputs ("m4_define([b4_symbol_numbers],\n[", out); + for (i = 0; i < nsyms; ++i) + fprintf (out, "%s[%d]", i ? ", " : "", i); + fputs ("])\n\n", out); } @@ -320,17 +353,18 @@ 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); + fprintf (out, "b4_%scase(%d, [b4_syncline(%d, ", + rules[r].is_predicate ? "predicate_" : "", + 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. | -`--------------------------------------*/ +/*------------------------------------. +| Output the merge functions to OUT. | +`------------------------------------*/ static void merger_output (FILE *out) @@ -351,88 +385,110 @@ merger_output (FILE *out) fputs ("]])\n\n", out); } -/*--------------------------------------. -| Output the tokens definition to OUT. | -`--------------------------------------*/ + +/*---------------------------------------------. +| Prepare the muscles for symbol definitions. | +`---------------------------------------------*/ static void -token_definitions_output (FILE *out) +prepare_symbol_definitions (void) { int i; - char const *sep = ""; - - fputs ("m4_define([b4_tokens], \n[", out); - for (i = 0; i < ntokens; ++i) + for (i = 0; i < nsyms; ++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"; + 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); + + // 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("has_type"); + MUSCLE_INSERT_INT (key, !!sym->type_name); + + SET_KEY("type"); + MUSCLE_INSERT_STRING (key, sym->type_name ? sym->type_name : ""); + +#define CODE_PROP(PropName) \ + do { \ + code_props const *p = symbol_ ## PropName ## _get (sym); \ + SET_KEY("has_" #PropName); \ + MUSCLE_INSERT_INT (key, !!p->code); \ + \ + if (p->code) \ + { \ + SET_KEY(#PropName "_file"); \ + MUSCLE_INSERT_STRING (key, p->location.start.file); \ + \ + SET_KEY(#PropName "_line"); \ + MUSCLE_INSERT_INT (key, p->location.start.line); \ + \ + SET_KEY(#PropName); \ + MUSCLE_INSERT_STRING_RAW (key, p->code); \ + } \ + } while (0) + + CODE_PROP(destructor); + CODE_PROP(printer); +#undef CODE_PROP +#undef SET_KEY } - fputs ("])\n\n", out); } -/*---------------------------------------------------. -| Output the symbol destructors or printers to OUT. | -`---------------------------------------------------*/ +/*--------------------------------------. +| Output the tokens definition to OUT. | +`--------------------------------------*/ static void -symbol_code_props_output (FILE *out, char const *what, - code_props const *(*get)(symbol const *)) +token_definitions_output (FILE *out) { int i; char const *sep = ""; - fputs ("m4_define([b4_symbol_", out); - fputs (what, out); - fputs ("], \n[", out); - for (i = 0; i < nsyms; ++i) + fputs ("m4_define([b4_tokens], \n[", out); + for (i = 0; i < ntokens; ++i) { symbol *sym = symbols[i]; - char const *code = (*get) (sym)->code; - if (code) + int number = sym->user_token_number; + uniqstr id = symbol_id_get (sym); + + /* At this stage, if there are literal string aliases, they are + part of SYMBOLS, so we should not find their aliased symbols + here. */ + aver (number != USER_NUMBER_HAS_STRING_ALIAS); + + /* Skip error token and tokens without identifier. */ + if (sym != errtoken && id) { - location loc = (*get) (sym)->location; - /* Filename, lineno, - Symbol-name, Symbol-number, - code, optional typename. */ - fprintf (out, "%s[", sep); + fprintf (out, "%s[[[%s]], %d]", + sep, id, number); 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); @@ -485,6 +541,24 @@ prepare_actions (void) muscle_insert_unsigned_int_table ("conflicting_rules", conflict_list, 0, 1, conflict_list_cnt); } + + +/*--------------------------------------------. +| Output the definitions of all the muscles. | +`--------------------------------------------*/ + +static void +muscles_output (FILE *out) +{ + fputs ("m4_init()\n", out); + merger_output (out); + symbol_numbers_output (out); + token_definitions_output (out); + type_names_output (out); + user_actions_output (out); + // Must be last. + muscles_m4_output (out); +} /*---------------------------. | Call the skeleton parser. | @@ -494,9 +568,8 @@ static void output_skeleton (void) { FILE *in; - FILE *out; int filter_fd[2]; - char const *argv[9]; + char const *argv[10]; pid_t pid; /* Compute the names of the package data dir and skeleton files. */ @@ -547,6 +620,19 @@ output_skeleton (void) { 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; if (trace_flag & trace_m4) @@ -556,60 +642,40 @@ output_skeleton (void) argv[i++] = full_m4bison; argv[i++] = full_skeleton; argv[i++] = NULL; + aver (i <= ARRAY_CARDINALITY (argv)); } - /* 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); + /* 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); 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); - - type_names_output (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); + if (trace_flag & trace_muscles) + muscles_output (stderr); + { + FILE *out = fdopen (filter_fd[1], "w"); + if (! out) + error (EXIT_FAILURE, get_errno (), + "fdopen"); + 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"); + in = fdopen (filter_fd[0], "r"); if (! in) error (EXIT_FAILURE, get_errno (), "fdopen"); 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); - reap_subpipe (pid, m4); + wait_subprocess (pid, "m4", false, false, true, true, NULL); timevar_pop (TV_M4); } @@ -626,11 +692,8 @@ prepare (void) 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); @@ -683,6 +746,7 @@ output (void) prepare_rules (); prepare_states (); prepare_actions (); + prepare_symbol_definitions (); prepare ();