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Finish implementation of per-type %destructor/%printer. Discussed

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starting at
<http://lists.gnu.org/archive/html/bison-patches/2006-02/msg00064.html>
and
<http://lists.gnu.org/archive/html/bison-patches/2006-06/msg00091.html>.
* NEWS (2.3+): Add a description of this feature to the default
%destructor/%printer description.
* doc/bison.texinfo (Freeing Discarded Symbols): Likewise.
* src/symlist.c (symbol_list_destructor_set, symbol_list_printer_set):
Invoke semantic_type_destructor_set or semantic_type_printer_set when a
list node contains a semantic type.
* src/symtab.c, src/symtab.h: Extend with a table that associates
semantic types with their %destructor's and %printer's.
(semantic_type_from_uniqstr, semantic_type_get,
semantic_type_destructor_set, semantic_type_printer_set): New functions
composing the public interface of that table.
(symbol_destructor_get, symbol_destructor_location_get,
symbol_printer_get, symbol_printer_location_get):  If there's no
per-symbol %destructor/%printer, look up the per-type before trying
the default.
* tests/actions.at (Per-type %printer and %destructor): New test case.
* tests/input.at (Default %printer and %destructor redeclared):
Extend to check that multiple occurrences of %symbol-default in a
single %destructor/%printer declaration is an error.
(Per-type %printer and %destructor redeclared, Unused values with
per-type %destructor): New test cases.
This commit is contained in:
Joel E. Denny
2006-09-04 22:20:52 +00:00
parent 3be03b13e5
commit b2a0b7ca70
8 changed files with 484 additions and 45 deletions
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47
src/symtab.h
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@@ -106,7 +106,6 @@ struct symbol
bool declared;
};
/** Undefined user number. */
#define USER_NUMBER_UNDEFINED -1
@@ -197,15 +196,51 @@ extern symbol *startsymbol;
extern location startsymbol_location;
/*---------------.
| Symbol table. |
`---------------*/
/*-----------------.
| Semantic types. |
`-----------------*/
/** A semantic type and its associated \c \%destructor and \c \%printer.
Access the fields of this struct only through the interface functions in
this file. \sa symbol::destructor */
typedef struct semantic_type {
/** The key, name of the semantic type. */
uniqstr tag;
/** Create the symbol table. */
/** Any \c %destructor declared for this semantic type. */
const char *destructor;
/** The location of \c semantic_type::destructor. */
location destructor_location;
/** Any \c %printer declared for this semantic type. */
const char *printer;
/** The location of \c semantic_type::printer. */
location printer_location;
} semantic_type;
/** Fetch (or create) the semantic type associated to KEY. */
semantic_type *semantic_type_from_uniqstr (const uniqstr key);
/** Fetch (or create) the semantic type associated to KEY. */
semantic_type *semantic_type_get (const char *key);
/** Set the \c destructor associated with \c type. */
void semantic_type_destructor_set (semantic_type *type, const char *destructor,
location loc);
/** Set the \c printer associated with \c type. */
void semantic_type_printer_set (semantic_type *type, const char *printer,
location loc);
/*----------------------------------.
| Symbol and semantic type tables. |
`----------------------------------*/
/** Create the symbol and semantic type tables. */
void symbols_new (void);
/** Free all the memory allocated for symbols. */
/** Free all the memory allocated for symbols and semantic types. */
void symbols_free (void);
/** Check that all the symbols are defined.