X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d63282419d27320c40be57d46418a0b44691626c..7891a7c4493684272f5db705bcb115404f52e6c1:/src/parse-gram.y diff --git a/src/parse-gram.y b/src/parse-gram.y index 1b7ab83b..e189e143 100644 --- a/src/parse-gram.y +++ b/src/parse-gram.y @@ -1,6 +1,6 @@ -/* Bison Grammar Parser -*- C -*- +%{/* Bison Grammar Parser -*- C -*- - Copyright (C) 2002, 2003 Free Software Foundation, Inc. + Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -16,20 +16,11 @@ You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + 02110-1301 USA */ - -%debug -%defines -%locations -%pure-parser -%error-verbose -%defines -%name-prefix="gram_" - -%{ +#include #include "system.h" #include "complain.h" @@ -38,34 +29,57 @@ #include "getargs.h" #include "gram.h" #include "muscle_tab.h" -#include "output.h" +#include "quotearg.h" #include "reader.h" #include "symlist.h" +#include "strverscmp.h" #define YYLLOC_DEFAULT(Current, Rhs, N) (Current) = lloc_default (Rhs, N) static YYLTYPE lloc_default (YYLTYPE const *, int); +#define YY_LOCATION_PRINT(File, Loc) \ + location_print (File, Loc) + +static void version_check (location const *loc, char const *version); + /* Request detailed syntax error messages, and pass them to GRAM_ERROR. FIXME: depends on the undocumented availability of YYLLOC. */ #undef yyerror #define yyerror(Msg) \ - gram_error (&yylloc, Msg) + gram_error (&yylloc, Msg) static void gram_error (location const *, char const *); -#define YYPRINT(File, Type, Value) \ - print_token_value (File, Type, &Value) -static void print_token_value (FILE *, int, YYSTYPE const *); - static void add_param (char const *, char *, location); -symbol_class current_class = unknown_sym; -uniqstr current_type = 0; -symbol *current_lhs; -location current_lhs_location; -assoc current_assoc; -int current_prec = 0; +static symbol_class current_class = unknown_sym; +static uniqstr current_type = 0; +static symbol *current_lhs; +static location current_lhs_location; +static int current_prec = 0; + +#ifdef UINT_FAST8_MAX +# define YYTYPE_UINT8 uint_fast8_t +#endif +#ifdef INT_FAST8_MAX +# define YYTYPE_INT8 int_fast8_t +#endif +#ifdef UINT_FAST16_MAX +# define YYTYPE_UINT16 uint_fast16_t +#endif +#ifdef INT_FAST16_MAX +# define YYTYPE_INT16 int_fast16_t +#endif %} +%debug +%verbose +%defines +%locations +%pure-parser +%error-verbose +%defines +%name-prefix="gram_" + %initial-action { /* Bison's grammar can initial empty locations, hence a default @@ -130,10 +144,11 @@ int current_prec = 0; PERCENT_NO_DEFAULT_PREC "%no-default-prec" PERCENT_NO_LINES "%no-lines" PERCENT_NONDETERMINISTIC_PARSER - "%nondeterministic-parser" + "%nondeterministic-parser" PERCENT_OUTPUT "%output" PERCENT_PARSE_PARAM "%parse-param {...}" PERCENT_PURE_PARSER "%pure-parser" + PERCENT_REQUIRE "%require" PERCENT_SKELETON "%skeleton" PERCENT_START "%start" PERCENT_TOKEN_TABLE "%token-table" @@ -160,11 +175,25 @@ int current_prec = 0; "%parse-param {...}" "%printer {...}" "%union {...}" - BRACED_CODE action + PROLOGUE EPILOGUE +%printer { fprintf (stderr, "\"%s\"", $$); } + STRING string_content +%printer { fprintf (stderr, "{\n%s\n}", $$); } + "%destructor {...}" + "%initial-action {...}" + "%lex-param {...}" + "%parse-param {...}" + "%printer {...}" + "%union {...}" PROLOGUE EPILOGUE %type TYPE +%printer { fprintf (stderr, "<%s>", $$); } TYPE %type INT -%type ID ID_COLON symbol string_as_id +%printer { fprintf (stderr, "%d", $$); } INT +%type ID symbol string_as_id +%printer { fprintf (stderr, "%s", $$->tag); } ID symbol string_as_id +%type ID_COLON +%printer { fprintf (stderr, "%s:", $$->tag); } ID_COLON %type precedence_declarator %type symbols.1 %% @@ -187,29 +216,35 @@ declaration: grammar_declaration | PROLOGUE { prologue_augment ($1, @1); } | "%debug" { debug_flag = true; } +| "%define" string_content + { + static char one[] = "1"; + muscle_insert ($2, one); + } | "%define" string_content string_content { muscle_insert ($2, $3); } | "%defines" { defines_flag = true; } | "%error-verbose" { error_verbose = true; } | "%expect" INT { expected_sr_conflicts = $2; } -| "%expect-rr" INT { expected_rr_conflicts = $2; } +| "%expect-rr" INT { expected_rr_conflicts = $2; } | "%file-prefix" "=" string_content { spec_file_prefix = $3; } | "%glr-parser" - { - nondeterministic_parser = true; - glr_parser = true; - } + { + nondeterministic_parser = true; + glr_parser = true; + } | "%initial-action {...}" - { - muscle_code_grow ("initial_action", $1, @1); - } + { + muscle_code_grow ("initial_action", $1, @1); + } | "%lex-param {...}" { add_param ("lex_param", $1, @1); } | "%locations" { locations_flag = true; } | "%name-prefix" "=" string_content { spec_name_prefix = $3; } | "%no-lines" { no_lines_flag = true; } -| "%nondeterministic-parser" { nondeterministic_parser = true; } +| "%nondeterministic-parser" { nondeterministic_parser = true; } | "%output" "=" string_content { spec_outfile = $3; } | "%parse-param {...}" { add_param ("parse_param", $1, @1); } | "%pure-parser" { pure_parser = true; } +| "%require" string_content { version_check (&@2, $2); } | "%skeleton" string_content { skeleton = $2; } | "%token-table" { token_table_flag = true; } | "%verbose" { report_flag = report_states; } @@ -226,9 +261,19 @@ grammar_declaration: } | "%union {...}" { + char const *body = $1; + + if (typed) + { + /* Concatenate the union bodies, turning the first one's + trailing '}' into '\n', and omitting the second one's '{'. */ + char *code = muscle_find ("stype"); + code[strlen (code) - 1] = '\n'; + body++; + } + typed = true; - MUSCLE_INSERT_INT ("stype_line", @1.start.line); - muscle_insert ("stype", $1); + muscle_code_grow ("stype", body, @1); } | "%destructor {...}" symbols.1 { @@ -241,7 +286,7 @@ grammar_declaration: { symbol_list *list; for (list = $2; list; list = list->next) - symbol_printer_set (list->sym, $1, list->location); + symbol_printer_set (list->sym, $1, @1); symbol_list_free ($2); } | "%default-prec" @@ -315,24 +360,24 @@ symbol_def: } | ID { - symbol_class_set ($1, current_class, @1); + symbol_class_set ($1, current_class, @1, true); symbol_type_set ($1, current_type, @1); } | ID INT { - symbol_class_set ($1, current_class, @1); + symbol_class_set ($1, current_class, @1, true); symbol_type_set ($1, current_type, @1); symbol_user_token_number_set ($1, $2, @2); } | ID string_as_id { - symbol_class_set ($1, current_class, @1); + symbol_class_set ($1, current_class, @1, true); symbol_type_set ($1, current_type, @1); symbol_make_alias ($1, $2, @$); } | ID INT string_as_id { - symbol_class_set ($1, current_class, @1); + symbol_class_set ($1, current_class, @1, true); symbol_type_set ($1, current_type, @1); symbol_user_token_number_set ($1, $2, @2); symbol_make_alias ($1, $3, @$); @@ -360,10 +405,6 @@ grammar: rules_or_grammar_declaration: rules | grammar_declaration ";" - { - if (yacc_flag) - complain_at (@$, _("POSIX forbids declarations in the grammar")); - } | error ";" { yyerrok; @@ -375,18 +416,17 @@ rules: ; rhses.1: - rhs { grammar_rule_end (@1); } -| rhses.1 "|" rhs { grammar_rule_end (@3); } + rhs { grammar_current_rule_end (@1); } +| rhses.1 "|" rhs { grammar_current_rule_end (@3); } | rhses.1 ";" ; rhs: /* Nothing. */ - { grammar_rule_begin (current_lhs, current_lhs_location); } + { grammar_current_rule_begin (current_lhs, current_lhs_location); } | rhs symbol { grammar_current_rule_symbol_append ($2, @2); } | rhs action - { grammar_current_rule_action_append ($2, @2); } | rhs "%prec" symbol { grammar_current_rule_prec_set ($3, @3); } | rhs "%dprec" INT @@ -400,27 +440,37 @@ symbol: | string_as_id { $$ = $1; } ; +/* Handle the semantics of an action specially, with a mid-rule + action, so that grammar_current_rule_action_append is invoked + immediately after the braced code is read by the scanner. + + This implementation relies on the LALR(1) parsing algorithm. + If grammar_current_rule_action_append were executed in a normal + action for this rule, then when the input grammar contains two + successive actions, the scanner would have to read both actions + before reducing this rule. That wouldn't work, since the scanner + relies on all preceding input actions being processed by + grammar_current_rule_action_append before it scans the next + action. */ action: + { grammar_current_rule_action_append (last_string, last_braced_code_loc); } BRACED_CODE - { $$ = $1; } ; -/* A string used as an ID: we have to keep the quotes. */ +/* A string used as an ID: quote it. */ string_as_id: STRING { - $$ = symbol_get ($1, @1); - symbol_class_set ($$, token_sym, @1); + $$ = symbol_get (quotearg_style (c_quoting_style, $1), @1); + symbol_class_set ($$, token_sym, @1, false); } ; -/* A string used for its contents. Strip the quotes. */ +/* A string used for its contents. Don't quote it. */ string_content: STRING - { - $$ = $1 + 1; - $$[strlen ($$) - 1] = '\0'; - }; + { $$ = $1; } +; epilogue.opt: @@ -445,7 +495,11 @@ lloc_default (YYLTYPE const *rhs, int n) { int i; YYLTYPE loc; - loc.start = loc.end = rhs[n].end; + + /* SGI MIPSpro 7.4.1m miscompiles "loc.start = loc.end = rhs[n].end;". + The bug is fixed in 7.4.2m, but play it safe for now. */ + loc.start = rhs[n].end; + loc.end = rhs[n].end; /* Ignore empty nonterminals the start of the the right-hand side. Do not bother to ignore them at the end of the right-hand side, @@ -467,22 +521,28 @@ lloc_default (YYLTYPE const *rhs, int n) static void add_param (char const *type, char *decl, location loc) { - static char const alphanum[] = - "0123456789" + static char const alphanum[26 + 26 + 1 + 10] = "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" - "_"; - char const *alpha = alphanum + 10; + "_" + "0123456789"; char const *name_start = NULL; char *p; - for (p = decl; *p; p++) - if ((p == decl || ! strchr (alphanum, p[-1])) && strchr (alpha, p[0])) + /* Stop on last actual character. */ + for (p = decl; p[1]; p++) + if ((p == decl + || ! memchr (alphanum, p[-1], sizeof alphanum)) + && memchr (alphanum, p[0], sizeof alphanum - 10)) name_start = p; - /* Strip the surrounding '{' and '}'. */ - decl++; - p[-1] = '\0'; + /* Strip the surrounding '{' and '}', and any blanks just inside + the braces. */ + while (*--p == ' ' || *p == '\t') + continue; + p[1] = '\0'; + while (*++decl == ' ' || *decl == '\t') + continue; if (! name_start) complain_at (loc, _("missing identifier in parameter declaration")); @@ -492,7 +552,7 @@ add_param (char const *type, char *decl, location loc) size_t name_len; for (name_len = 1; - name_start[name_len] && strchr (alphanum, name_start[name_len]); + memchr (alphanum, name_start[name_len], sizeof alphanum); name_len++) continue; @@ -506,46 +566,14 @@ add_param (char const *type, char *decl, location loc) scanner_last_string_free (); } -/*----------------------------------------------------. -| When debugging the parser, display tokens' values. | -`----------------------------------------------------*/ - static void -print_token_value (FILE *file, int type, YYSTYPE const *value) +version_check (location const *loc, char const *version) { - fputc (' ', file); - switch (type) + if (strverscmp (version, PACKAGE_VERSION) > 0) { - case ID: - fprintf (file, " = %s", value->symbol->tag); - break; - - case INT: - fprintf (file, " = %d", value->integer); - break; - - case STRING: - fprintf (file, " = \"%s\"", value->chars); - break; - - case TYPE: - fprintf (file, " = <%s>", value->uniqstr); - break; - - case BRACED_CODE: - case PERCENT_DESTRUCTOR: - case PERCENT_LEX_PARAM: - case PERCENT_PARSE_PARAM: - case PERCENT_PRINTER: - case PERCENT_UNION: - case PROLOGUE: - case EPILOGUE: - fprintf (file, " = {{ %s }}", value->chars); - break; - - default: - fprintf (file, "unknown token type"); - break; + complain_at (*loc, "require bison %s, but have %s", + version, PACKAGE_VERSION); + exit (63); } } @@ -558,5 +586,5 @@ gram_error (location const *loc, char const *msg) char const * token_name (int type) { - return yytname[type]; + return yytname[YYTRANSLATE (type)]; }