X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d78f0ac9d8c8830542faf9d00d0b6ef652dda45e..fcd32abd3a4b68ef525d7766dbed1c98465e23b9:/src/parse-gram.y diff --git a/src/parse-gram.y b/src/parse-gram.y index 8e3b7320..4d48d7ad 100644 --- a/src/parse-gram.y +++ b/src/parse-gram.y @@ -1,6 +1,6 @@ %{/* Bison Grammar Parser -*- C -*- - Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software + Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -26,7 +26,8 @@ #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" @@ -49,34 +50,29 @@ static void version_check (location const *loc, char const *version); static void gram_error (location const *, char const *); static char const *char_name (char); - -/** Add a lex-param or a parse-param. - * - * \param type \a lex_param or \a parse_param - * \param decl the formal argument - * \param loc the location in the source. - */ -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 location current_lhs_location; -static int current_prec = 0; - -#define YYTYPE_INT16 int_fast16_t -#define YYTYPE_INT8 int_fast8_t -#define YYTYPE_UINT16 uint_fast16_t -#define YYTYPE_UINT8 uint_fast8_t %} +%code +{ + static int current_prec = 0; + static location current_lhs_location; + static named_ref *current_lhs_named_ref; + static symbol *current_lhs; + static symbol_class current_class = unknown_sym; + static uniqstr current_type = NULL; + + #define YYTYPE_INT16 int_fast16_t + #define YYTYPE_INT8 int_fast8_t + #define YYTYPE_UINT16 uint_fast16_t + #define YYTYPE_UINT8 uint_fast8_t +} + %debug %verbose %defines %locations %pure-parser -%error-verbose +%define parse.error "verbose" %name-prefix="gram_" %expect 0 @@ -90,12 +86,13 @@ static int current_prec = 0; %union { + assoc assoc; + char *code; + char const *chars; + int integer; + named_ref *named_ref; symbol *symbol; symbol_list *list; - int integer; - char const *chars; - char *code; - assoc assoc; uniqstr uniqstr; unsigned char character; }; @@ -128,28 +125,24 @@ static int current_prec = 0; %token PERCENT_CODE "%code" - PERCENT_DEBUG "%debug" PERCENT_DEFAULT_PREC "%default-prec" PERCENT_DEFINE "%define" PERCENT_DEFINES "%defines" PERCENT_ERROR_VERBOSE "%error-verbose" PERCENT_EXPECT "%expect" - PERCENT_EXPECT_RR "%expect-rr" + PERCENT_EXPECT_RR "%expect-rr" + PERCENT_FLAG "%" PERCENT_FILE_PREFIX "%file-prefix" PERCENT_GLR_PARSER "%glr-parser" PERCENT_INITIAL_ACTION "%initial-action" PERCENT_LANGUAGE "%language" - PERCENT_LEX_PARAM "%lex-param" - PERCENT_LOCATIONS "%locations" PERCENT_NAME_PREFIX "%name-prefix" 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_REQUIRE "%require" PERCENT_SKELETON "%skeleton" PERCENT_START "%start" PERCENT_TOKEN_TABLE "%token-table" @@ -158,6 +151,7 @@ static int current_prec = 0; ; %token BRACED_CODE "{...}" +%token BRACKETED_ID "[identifier]" %token CHAR "char" %token EPILOGUE "epilogue" %token EQUAL "=" @@ -167,9 +161,9 @@ static int current_prec = 0; %token PIPE "|" %token PROLOGUE "%{...%}" %token SEMICOLON ";" -%token TYPE "type" -%token TYPE_TAG_ANY "<*>" -%token TYPE_TAG_NONE "<>" +%token TAG "" +%token TAG_ANY "<*>" +%token TAG_NONE "<>" %type CHAR %printer { fputs (char_name ($$), stderr); } CHAR @@ -183,20 +177,74 @@ static int current_prec = 0; %printer { fprintf (stderr, "{\n%s\n}", $$); } 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 PERCENT_FLAG TAG variable +%printer { fputs ($$, stderr); } +%printer { fprintf (stderr, "[%s]", $$); } BRACKETED_ID %printer { fprintf (stderr, "%s:", $$); } ID_COLON +%printer { fprintf (stderr, "%%%s", $$); } PERCENT_FLAG +%printer { fprintf (stderr, "<%s>", $$); } TAG %type INT -%printer { fprintf (stderr, "%d", $$); } INT +%printer { fprintf (stderr, "%d", $$); } -%type id id_colon symbol symbol.prec string_as_id -%printer { fprintf (stderr, "%s", $$->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 symbols.prec generic_symlist generic_symlist_item +%type named_ref.opt + +/*---------. +| %param. | +`---------*/ +%code requires +{ +# ifndef PARAM_TYPE +# define PARAM_TYPE + typedef enum + { + param_none = 0, + param_lex = 1 << 0, + param_parse = 1 << 1, + param_both = param_lex | param_parse + } param_type; +# endif +}; +%code +{ + /** Add a lex-param and/or a parse-param. + * + * \param type where to push this formal argument. + * \param decl the formal argument. Destroyed. + * \param loc the location in the source. + */ + static void add_param (param_type type, char *decl, location loc); + static param_type current_param = param_none; +}; +%union +{ + param_type param; +} +%token PERCENT_PARAM "%param"; +%printer +{ + switch ($$) + { +#define CASE(In, Out) \ + case param_ ## In: fputs ("%" #Out, stderr); break + CASE(lex, lex-param); + CASE(parse, parse-param); + CASE(both, param); +#undef CASE + case param_none: aver (false); break; + } +} ; + + + /*==========\ + | Grammar. | + \==========*/ %% input: @@ -225,10 +273,14 @@ prologue_declaration: plain_code.code, @1); code_scanner_last_string_free (); } -| "%debug" { debug_flag = true; } +| "%" + { + muscle_percent_define_ensure ($1, @1, 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 @@ -236,7 +288,11 @@ prologue_declaration: defines_flag = true; spec_defines_file = xstrdup ($2); } -| "%error-verbose" { error_verbose = true; } +| "%error-verbose" + { + muscle_percent_define_insert ("parse.error", @1, "verbose", + MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE); + } | "%expect" INT { expected_sr_conflicts = $2; } | "%expect-rr" INT { expected_rr_conflicts = $2; } | "%file-prefix" STRING { spec_file_prefix = $2; } @@ -256,28 +312,13 @@ prologue_declaration: code_scanner_last_string_free (); } | "%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; } | "%name-prefix" "=" STRING { spec_name_prefix = $3; } /* deprecated */ | "%no-lines" { no_lines_flag = true; } | "%nondeterministic-parser" { nondeterministic_parser = true; } | "%output" STRING { spec_outfile = $2; } | "%output" "=" STRING { spec_outfile = $3; } /* deprecated */ -| "%parse-param" "{...}" { add_param ("parse_param", $2, @2); } -| "%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, ""); - /* 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, ""); - } +| "%param" { current_param = $1; } params { current_param = param_none; } | "%require" STRING { version_check (&@2, $2); } | "%skeleton" STRING { @@ -309,6 +350,16 @@ prologue_declaration: | /*FIXME: Err? What is this horror doing here? */ ";" ; +params: + params "{...}" { add_param (current_param, $2, @2); } +| "{...}" { add_param (current_param, $1, @1); } +; + + +/*----------------------. +| grammar_declaration. | +`----------------------*/ + grammar_declaration: precedence_declaration | symbol_declaration @@ -387,7 +438,7 @@ symbol_declaration: current_class = unknown_sym; current_type = NULL; } -| "%type" TYPE symbols.1 +| "%type" TAG symbols.1 { symbol_list *list; tag_seen = true; @@ -398,7 +449,7 @@ symbol_declaration: ; precedence_declaration: - precedence_declarator type.opt symbols.prec + precedence_declarator tag.opt symbols.prec { symbol_list *list; ++current_prec; @@ -419,9 +470,9 @@ precedence_declarator: | "%precedence" { $$ = precedence_assoc; } ; -type.opt: +tag.opt: /* Nothing. */ { current_type = NULL; } -| TYPE { current_type = $1; tag_seen = true; } +| TAG { current_type = $1; tag_seen = true; } ; /* Just like symbols.1 but accept INT for the sake of POSIX. */ @@ -451,15 +502,15 @@ generic_symlist: ; generic_symlist_item: - symbol { $$ = symbol_list_sym_new ($1, @1); } -| TYPE { $$ = symbol_list_type_new ($1, @1); } -| "<*>" { $$ = symbol_list_default_tagged_new (@1); } -| "<>" { $$ = symbol_list_default_tagless_new (@1); } + symbol { $$ = symbol_list_sym_new ($1, @1); } +| TAG { $$ = symbol_list_type_new ($1, @1); } +| "<*>" { $$ = symbol_list_default_tagged_new (@1); } +| "<>" { $$ = symbol_list_default_tagless_new (@1); } ; /* One token definition. */ symbol_def: - TYPE + TAG { current_type = $1; tag_seen = true; @@ -518,7 +569,8 @@ rules_or_grammar_declaration: ; rules: - id_colon { current_lhs = $1; current_lhs_location = @1; } rhses.1 + id_colon named_ref.opt { current_lhs = $1; current_lhs_location = @1; + current_lhs_named_ref = $2; } rhses.1 ; rhses.1: @@ -529,35 +581,42 @@ 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, 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 { grammar_current_rule_dprec_set ($3, @3); } -| rhs "%merge" TYPE +| rhs "%merge" TAG { 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 ; @@ -662,34 +721,33 @@ lloc_default (YYLTYPE const *rhs, int n) } -/* Add a lex-param or a parse-param (depending on TYPE) with - declaration DECL and location LOC. */ - static void -add_param (char const *type, char *decl, location loc) +add_param (param_type type, char *decl, location loc) { static char const alphanum[26 + 26 + 1 + 10] = "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "_" "0123456789"; + char const *name_start = NULL; - char *p; - - /* 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 '}', and any blanks just inside - the braces. */ - while (*--p == ' ' || *p == '\t') - continue; - p[1] = '\0'; - while (*++decl == ' ' || *decl == '\t') - continue; + { + char *p; + /* 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 '}', 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")); @@ -706,7 +764,10 @@ add_param (char const *type, char *decl, location loc) name = xmalloc (name_len + 1); memcpy (name, name_start, name_len); name[name_len] = '\0'; - muscle_pair_list_grow (type, decl, name); + if (type & param_lex) + muscle_pair_list_grow ("lex_param", decl, name); + if (type & param_parse) + muscle_pair_list_grow ("parse_param", decl, name); free (name); }