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If the user does not define YYSTYPE as a macro, Bison now declares it

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using typedef instead of defining it as a macro.  POSIX requires this.
	For consistency, YYLTYPE is also declared instead of defined.

	%union directives can now have a tag before the `{', e.g., the
	directive `%union foo {...}' now generates the C code
	`typedef union foo { ... } YYSTYPE;'; this is for Yacc compatibility.
	The default union tag is `YYSTYPE', for compatibility with Solaris 9
	Yacc.  For consistency, YYLTYPE's struct tag is now `YYLTYPE'
	instead of `yyltype'.

	`yystype' and `yyltype' are now obsolescent macros instead of being
	typedefs or tags; they are no longer documented and will be
	withdrawn in a future release.
This commit is contained in:
Paul Eggert
2002-12-24 07:43:43 +00:00
parent 050c471b8e
commit 6273355b36
1 changed files with 23 additions and 11 deletions
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34
doc/bison.texinfo
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@@ -3102,13 +3102,13 @@ When @code{YYLTYPE} is not defined, Bison uses a default structure type with
four members:
@example
struct
typedef struct YYLTYPE
@{
int first_line;
int first_column;
int last_line;
int last_column;
@}
@} YYLTYPE;
@end example
@node Actions and Locations
@@ -3417,7 +3417,23 @@ This says that the two alternative types are @code{double} and @code{symrec
in the @code{%token} and @code{%type} declarations to pick one of the types
for a terminal or nonterminal symbol (@pxref{Type Decl, ,Nonterminal Symbols}).
Note that, unlike making a @code{union} declaration in C, you do not write
As an extension to @acronym{POSIX}, a tag is allowed after the
@code{union}. For example:
@example
@group
%union value @{
double val;
symrec *tptr;
@}
@end group
@end example
specifies the union tag @code{value}, so the corresponding C type is
@code{union value}. If you do not specify a tag, it defaults to
@code{YYSTYPE}.
Note that, unlike making a @code{union} declaration in C, you need not write
a semicolon after the closing brace.
@node Type Decl
@@ -6452,15 +6468,11 @@ macro is deprecated, and is supported only for Yacc like parsers.
@xref{Pure Calling,, Calling Conventions for Pure Parsers}.
@end deffn
@deffn {Macro} YYLTYPE
Macro for the data type of @code{yylloc}; a structure with four
@deffn {Type} YYLTYPE
Data type of @code{yylloc}; by default, a structure with four
members. @xref{Location Type, , Data Types of Locations}.
@end deffn
@deffn {Type} yyltype
Default value for YYLTYPE.
@end deffn
@deffn {Macro} YYMAXDEPTH
Macro for specifying the maximum size of the parser stack. @xref{Stack
Overflow}.
@@ -6485,8 +6497,8 @@ grow its internal stacks. Do @emph{not} define @code{YYSTACK_USE_ALLOCA}
to anything else.
@end deffn
@deffn {Macro} YYSTYPE
Macro for the data type of semantic values; @code{int} by default.
@deffn {Type} YYSTYPE
Data type of semantic values; @code{int} by default.
@xref{Value Type, ,Data Types of Semantic Values}.
@end deffn