X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d782395d52519fabb2cac3bd479246cc6de7efa8..041308d0c03783c51ef362f888c957cd2a0e129a:/src/parse-gram.y diff --git a/src/parse-gram.y b/src/parse-gram.y index e50ec271..33b802ed 100644 --- a/src/parse-gram.y +++ b/src/parse-gram.y @@ -1,7 +1,6 @@ %{/* Bison Grammar Parser -*- C -*- - Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, - Inc. + Copyright (C) 2002-2012 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -21,14 +20,13 @@ #include #include "system.h" -#include - #include "complain.h" #include "conflicts.h" #include "files.h" #include "getargs.h" #include "gram.h" -#include "muscle_tab.h" +#include "muscle-tab.h" +#include "named-ref.h" #include "quotearg.h" #include "reader.h" #include "symlist.h" @@ -63,10 +61,30 @@ static void add_param (char const *type, char *decl, location loc); static symbol_class current_class = unknown_sym; static uniqstr current_type = NULL; -static symbol *current_lhs; +static symbol *current_lhs_symbol; static location current_lhs_location; +static named_ref *current_lhs_named_ref; static int current_prec = 0; +/** Set the new current left-hand side symbol, possibly common + * to several right-hand side parts of rule. + */ +static +void +current_lhs(symbol *sym, location loc, named_ref *ref) +{ + current_lhs_symbol = sym; + current_lhs_location = loc; + /* In order to simplify memory management, named references for lhs + are always assigned by deep copy into the current symbol_list + node. This is because a single named-ref in the grammar may + result in several uses when the user factors lhs between several + rules using "|". Therefore free the parser's original copy. */ + free (current_lhs_named_ref); + current_lhs_named_ref = ref; +} + + #define YYTYPE_INT16 int_fast16_t #define YYTYPE_INT8 int_fast8_t #define YYTYPE_UINT16 uint_fast16_t @@ -79,6 +97,7 @@ static int current_prec = 0; %locations %pure-parser %error-verbose +%define parse.lac full %name-prefix="gram_" %expect 0 @@ -100,6 +119,7 @@ static int current_prec = 0; assoc assoc; uniqstr uniqstr; unsigned char character; + named_ref *named_ref; }; /* Define the tokens together with their human representation. */ @@ -159,6 +179,7 @@ static int current_prec = 0; ; %token BRACED_CODE "{...}" +%token BRACKETED_ID "[identifier]" %token CHAR "char" %token EPILOGUE "epilogue" %token EQUAL "=" @@ -184,20 +205,23 @@ static int current_prec = 0; %printer { fprintf (stderr, "{\n%s\n}", $$); } braceless content.opt "{...}" "%{...%}" EPILOGUE -%type TYPE ID ID_COLON variable -%printer { fprintf (stderr, "<%s>", $$); } TYPE -%printer { fputs ($$, stderr); } ID variable +%type BRACKETED_ID ID ID_COLON TYPE variable +%printer { fputs ($$, stderr); } +%printer { fprintf (stderr, "[%s]", $$); } BRACKETED_ID %printer { fprintf (stderr, "%s:", $$); } ID_COLON +%printer { fprintf (stderr, "<%s>", $$); } TYPE %type INT -%printer { fprintf (stderr, "%d", $$); } INT +%printer { fprintf (stderr, "%d", $$); } -%type id id_colon symbol string_as_id -%printer { fprintf (stderr, "%s", $$->tag); } id symbol string_as_id +%type id id_colon string_as_id symbol symbol.prec +%printer { fprintf (stderr, "%s", $$->tag); } %printer { fprintf (stderr, "%s:", $$->tag); } id_colon %type precedence_declarator -%type symbols.1 generic_symlist generic_symlist_item +%type symbols.1 symbols.prec generic_symlist generic_symlist_item +%type named_ref.opt + %% input: @@ -229,7 +253,8 @@ prologue_declaration: | "%debug" { debug_flag = true; } | "%define" variable content.opt { - muscle_percent_define_insert ($2, @2, $3); + muscle_percent_define_insert ($2, @2, $3, + MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE); } | "%defines" { defines_flag = true; } | "%defines" STRING @@ -256,7 +281,7 @@ prologue_declaration: muscle_code_grow ("initial_action", action.code, @2); code_scanner_last_string_free (); } -| "%language" STRING { language_argmatch ($2, 1, &@1); } +| "%language" STRING { language_argmatch ($2, grammar_prio, @1); } | "%lex-param" "{...}" { add_param ("lex_param", $2, @2); } | "%locations" { locations_flag = true; } | "%name-prefix" STRING { spec_name_prefix = $2; } @@ -266,12 +291,26 @@ prologue_declaration: | "%output" STRING { spec_outfile = $2; } | "%output" "=" STRING { spec_outfile = $3; } /* deprecated */ | "%parse-param" "{...}" { add_param ("parse_param", $2, @2); } -| "%pure-parser" { pure_parser = true; } +| "%pure-parser" + { + /* %pure-parser is deprecated in favor of `%define api.pure', so use + `%define api.pure' in a backward-compatible manner here. First, don't + complain if %pure-parser is specified multiple times. */ + if (!muscle_find_const ("percent_define(api.pure)")) + muscle_percent_define_insert ("api.pure", @1, "", + MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE); + /* In all cases, use api.pure now so that the backend doesn't complain if + the skeleton ignores api.pure, but do warn now if there's a previous + conflicting definition from an actual %define. */ + if (!muscle_percent_define_flag_if ("api.pure")) + muscle_percent_define_insert ("api.pure", @1, "", + MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE); + } | "%require" STRING { version_check (&@2, $2); } | "%skeleton" STRING { char const *skeleton_user = $2; - if (strchr (skeleton_user, '/')) + if (mbschr (skeleton_user, '/')) { size_t dir_length = strlen (current_file); char *skeleton_build; @@ -290,10 +329,10 @@ prologue_declaration: skeleton_user = uniqstr_new (skeleton_build); free (skeleton_build); } - skeleton_arg (skeleton_user, 1, &@1); + skeleton_arg (skeleton_user, grammar_prio, @1); } | "%token-table" { token_table_flag = true; } -| "%verbose" { report_flag = report_states; } +| "%verbose" { report_flag |= report_states; } | "%yacc" { yacc_flag = true; } | /*FIXME: Err? What is this horror doing here? */ ";" ; @@ -387,7 +426,7 @@ symbol_declaration: ; precedence_declaration: - precedence_declarator type.opt symbols.1 + precedence_declarator type.opt symbols.prec { symbol_list *list; ++current_prec; @@ -412,6 +451,19 @@ type.opt: | TYPE { current_type = $1; tag_seen = true; } ; +/* Just like symbols.1 but accept INT for the sake of POSIX. */ +symbols.prec: + symbol.prec + { $$ = symbol_list_sym_new ($1, @1); } +| symbols.prec symbol.prec + { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); } +; + +symbol.prec: + symbol { $$ = $1; } + | symbol INT { $$ = $1; symbol_user_token_number_set ($1, $2, @2); } + ; + /* One or more symbols to be %typed. */ symbols.1: symbol @@ -493,7 +545,11 @@ rules_or_grammar_declaration: ; rules: - id_colon { current_lhs = $1; current_lhs_location = @1; } rhses.1 + id_colon named_ref.opt { current_lhs ($1, @1, $2); } rhses.1 + { + /* Free the current lhs. */ + current_lhs (0, @1, 0); + } ; rhses.1: @@ -504,11 +560,12 @@ rhses.1: rhs: /* Nothing. */ - { grammar_current_rule_begin (current_lhs, current_lhs_location); } -| rhs symbol - { grammar_current_rule_symbol_append ($2, @2); } -| rhs "{...}" - { grammar_current_rule_action_append ($2, @2); } + { grammar_current_rule_begin (current_lhs_symbol, current_lhs_location, + current_lhs_named_ref); } +| rhs symbol named_ref.opt + { grammar_current_rule_symbol_append ($2, @2, $3); } +| rhs "{...}" named_ref.opt + { grammar_current_rule_action_append ($2, @2, $3); } | rhs "%prec" symbol { grammar_current_rule_prec_set ($3, @3); } | rhs "%dprec" INT @@ -517,22 +574,28 @@ rhs: { grammar_current_rule_merge_set ($3, @3); } ; +named_ref.opt: + /* Nothing. */ { $$ = 0; } +| + BRACKETED_ID { $$ = named_ref_new($1, @1); } +; + /*----------------------------* | variable and content.opt. | *---------------------------*/ +/* The STRING form of variable is deprecated and is not M4-friendly. + For example, M4 fails for `%define "[" "value"'. */ variable: ID - | STRING { $$ = uniqstr_new ($1); } /* deprecated and not M4-friendly */ - ; +| STRING { $$ = uniqstr_new ($1); } +; /* Some content or empty by default. */ content.opt: - /* Nothing. */ - { - $$ = ""; - } + /* Nothing. */ { $$ = ""; } +| ID { $$ = $1; } | STRING ; @@ -623,7 +686,7 @@ lloc_default (YYLTYPE const *rhs, int n) loc.start = rhs[n].end; loc.end = rhs[n].end; - /* Ignore empty nonterminals the start of the the right-hand side. + /* Ignore empty nonterminals the start of the right-hand side. Do not bother to ignore them at the end of the right-hand side, since empty nonterminals have the same end as their predecessors. */ for (i = 1; i <= n; i++) @@ -695,8 +758,8 @@ version_check (location const *loc, char const *version) if (strverscmp (version, PACKAGE_VERSION) > 0) { complain_at (*loc, "require bison %s, but have %s", - version, PACKAGE_VERSION); - exit (63); + version, PACKAGE_VERSION); + exit (EX_MISMATCH); } }