X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/527187137ac6314b86246bca71cb996203b4fa10..70b7c357476ed3525ddb5d2739e70690cfebb207:/src/symtab.h diff --git a/src/symtab.h b/src/symtab.h index 65155227..1a50bb95 100644 --- a/src/symtab.h +++ b/src/symtab.h @@ -1,6 +1,6 @@ /* Definitions for symtab.c and callers, part of Bison. - Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2012 Free Software + Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2013 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -46,11 +46,42 @@ typedef enum /** Internal token numbers. */ typedef int symbol_number; -#define SYMBOL_NUMBER_MAXIMUM INT_MAX +# define SYMBOL_NUMBER_MAXIMUM INT_MAX typedef struct symbol symbol; +/* Declaration status of a symbol. + + First, it is "undeclared". Then, if "undeclared" and used in a + %printer/%destructor, it is "used". If not "declared" but used in + a rule, it is "needed". Finally, if declared (via a rule for + nonterminals, or %token), it is "declared". + + When status are checked at the end, "declared" symbols are fine, + "used" symbols trigger warnings, otherwise it's an error. */ + +typedef enum + { + /** Used in the input file for an unknown reason (error). */ + undeclared, + /** Used by %destructor/%printer but not defined (warning). */ + used, + /** Used in the gramar (rules) but not defined (error). */ + needed, + /** Defined with %type or %token (good). */ + declared, + } status; + +typedef enum code_props_type code_props_type; +enum code_props_type + { + destructor = 0, + printer = 1, + }; + +enum { CODE_PROPS_SIZE = 2 }; + /* When extending this structure, be sure to complete symbol_check_alias_consistency. */ struct symbol @@ -60,24 +91,25 @@ struct symbol /** The location of its first occurrence. */ location location; - /** Its \c \%type. */ + /** Its \c \%type. + + Beware that this is the type_name as was entered by the user, + including silly things such as "]" if she entered "%token <]> t". + Therefore, when outputting type_name to M4, be sure to escape it + into "@}". See quoted_output for instance. */ uniqstr type_name; + /** Its \c \%type's location. */ location type_location; - /** Any \c \%destructor declared specifically for this symbol. - - Access this field only through symbol's interface functions. For - example, if symbol::destructor = NULL, a default \c \%destructor - or a per-type \c \%destructor might be appropriate, and - \c symbol_destructor_get will compute the correct one. */ - code_props destructor; - - /** Any \c \%printer declared specifically for this symbol. + /** Any \c \%destructor (resp. \%printer) declared specificially for this + symbol. - Access this field only through symbol's interface functions. - \sa symbol::destructor */ - code_props printer; + Access this field only through symbol's interface functions. For + example, if symbol::destructor = NULL (resp. symbol::printer + = NULL), a default \c \%destructor (resp. \%printer) or a per-type + \c symbol_destructor_printer_get will compute the correct one. */ + code_props props[CODE_PROPS_SIZE]; symbol_number number; location prec_location; @@ -90,20 +122,20 @@ struct symbol symbol-string pair for an alias. */ symbol *alias; symbol_class class; - bool declared; + status status; }; /** Undefined user number. */ -#define USER_NUMBER_UNDEFINED -1 +# define USER_NUMBER_UNDEFINED -1 /* `symbol->user_token_number == USER_NUMBER_HAS_STRING_ALIAS' means this symbol has a literal string alias. For instance, `%token foo "foo"' has `"foo"' numbered regularly, and `foo' numbered as USER_NUMBER_HAS_STRING_ALIAS. */ -#define USER_NUMBER_HAS_STRING_ALIAS -9991 +# define USER_NUMBER_HAS_STRING_ALIAS -9991 /* Undefined internal token number. */ -#define NUMBER_UNDEFINED (-1) +# define NUMBER_UNDEFINED (-1) /** Fetch (or create) the symbol associated to KEY. */ symbol *symbol_from_uniqstr (const uniqstr key, location loc); @@ -122,12 +154,15 @@ symbol *dummy_symbol_get (location loc); `--------------------*/ /** Print a symbol (for debugging). */ -void symbol_print (symbol *s, FILE *f); +void symbol_print (symbol const *s, FILE *f); /** Is this a dummy nonterminal? */ bool symbol_is_dummy (const symbol *sym); -/** Return the name of the symbol that can be used as an identifier. +/** The name of the code_props type: "\%destructor" or "\%printer". */ +char const *code_props_type_string (code_props_type kind); + +/** The name of the symbol that can be used as an identifier. ** Consider the alias if needed. ** Return 0 if there is none (e.g., the symbol is only defined as ** a string). */ @@ -144,24 +179,19 @@ void symbol_make_alias (symbol *sym, symbol *str, location loc); Do nothing if passed 0 as \c type_name. */ void symbol_type_set (symbol *sym, uniqstr type_name, location loc); -/** Set the \c destructor associated with \c sym. */ -void symbol_destructor_set (symbol *sym, code_props const *destructor); - -/** Get the computed \c \%destructor for \c sym, which was initialized with - \c code_props_none_init if there's no \c \%destructor. */ -code_props const *symbol_destructor_get (symbol const *sym); +/** Set the \c \%destructor or \c \%printer associated with \c sym. */ +void symbol_code_props_set (symbol *sym, code_props_type kind, + code_props const *destructor); -/** Set the \c printer associated with \c sym. */ -void symbol_printer_set (symbol *sym, code_props const *printer); +/** Get the computed \c \%destructor or \c %printer for \c sym, which was + initialized with \c code_props_none_init if there's no \c \%destructor or + \c %printer. */ +code_props *symbol_code_props_get (symbol *sym, code_props_type kind); -/** Get the computed \c \%printer for \c sym, which was initialized with - \c code_props_none_init if there's no \c \%printer. */ -code_props const *symbol_printer_get (symbol const *sym); +/** Set the \c precedence associated with \c sym. -/* Set the \c precedence associated with \c sym. - - Ensure that \a symbol is a terminal. - Do nothing if invoked with \c undef_assoc as \c assoc. */ + Ensure that \a symbol is a terminal. + Do nothing if invoked with \c undef_assoc as \c assoc. */ void symbol_precedence_set (symbol *sym, int prec, assoc a, location loc); /** Set the \c class associated with \c sym. */ @@ -206,25 +236,30 @@ typedef struct { /** The key, name of the semantic type. */ uniqstr tag; - /** Any \c %destructor declared for this semantic type. */ - code_props destructor; - /** Any \c %printer declared for this semantic type. */ - code_props printer; + /** The location of its first occurence. */ + location location; + + /** Its status : "undeclared", "used" or "declared". + It cannot be "needed". */ + status status; + + /** Any \c %destructor and %printer declared for this + semantic type. */ + code_props props[CODE_PROPS_SIZE]; + } semantic_type; /** Fetch (or create) the semantic type associated to KEY. */ -semantic_type *semantic_type_from_uniqstr (const uniqstr key); +semantic_type *semantic_type_from_uniqstr (const uniqstr key, + const location *loc); /** Fetch (or create) the semantic type associated to KEY. */ -semantic_type *semantic_type_get (const char *key); +semantic_type *semantic_type_get (const char *key, const location *loc); -/** Set the \c destructor associated with \c type. */ -void semantic_type_destructor_set (semantic_type *type, - code_props const *destructor); - -/** Set the \c printer associated with \c type. */ -void semantic_type_printer_set (semantic_type *type, - code_props const *printer); +/** Set the \c destructor or \c printer associated with \c type. */ +void semantic_type_code_props_set (semantic_type *type, + code_props_type kind, + code_props const *code); /*----------------------------------. | Symbol and semantic type tables. | @@ -247,19 +282,4 @@ void symbols_check_defined (void); #token_translations. */ void symbols_pack (void); - -/*---------------------------------------. -| Default %destructor's and %printer's. | -`---------------------------------------*/ - -/** Set the default \c \%destructor for tagged values. */ -void default_tagged_destructor_set (code_props const *destructor); -/** Set the default \c \%destructor for tagless values. */ -void default_tagless_destructor_set (code_props const *destructor); - -/** Set the default \c \%printer for tagged values. */ -void default_tagged_printer_set (code_props const *printer); -/** Set the default \c \%printer for tagless values. */ -void default_tagless_printer_set (code_props const *printer); - #endif /* !SYMTAB_H_ */