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c: improve the definition of public types

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* data/c.m4 (b4_token_enum): Improve comments.
(b4_value_type_define, b4_location_type_define): New, extracted
from...
(b4_declare_yylstype): here.
Separate the typedefs from the union/struct definitions.
This commit is contained in:
Akim Demaille
2012-12-23 17:54:59 +01:00
parent ae8880deec
commit 4d9bdbe384
2 changed files with 33 additions and 17 deletions
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48
data/c.m4
View File

@@ -270,11 +270,9 @@ m4_define([b4_token_enum],
# --------------
# Output the definition of the tokens (if there are) as enums.
m4_define([b4_token_enums],
[b4_any_token_visible_if([[/* Tokens. */
[b4_any_token_visible_if([[/* Token type. */
#ifndef ]b4_api_PREFIX[TOKENTYPE
# define ]b4_api_PREFIX[TOKENTYPE
/* Put the tokens into the symbol table, so that GDB and other debuggers
know about them. */
enum ]b4_api_prefix[tokentype
{
]m4_join([,
@@ -503,44 +501,62 @@ b4_locations_if([, yylocationp])[]b4_user_args[);
## Declarations. ##
## -------------- ##
# b4_declare_yylstype
# -------------------
# Declarations that might either go into the header (if --defines) or
# in the parser body. Declare YYSTYPE/YYLTYPE, and yylval/yylloc.
m4_define([b4_declare_yylstype],
[[#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
# b4_value_type_define
# --------------------
m4_define([b4_value_type_define],
[[/* Value type. */
#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
]m4_ifdef([b4_stype],
[[typedef union ]b4_union_name[
[[typedef union ]b4_union_name[ ]b4_api_PREFIX[STYPE;
union ]b4_union_name[
{
]b4_user_stype[
} ]b4_api_PREFIX[STYPE;
};
# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]],
[m4_if(b4_tag_seen_flag, 0,
[[typedef int ]b4_api_PREFIX[STYPE;
# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]])])[
# define ]b4_api_PREFIX[STYPE_IS_DECLARED 1
#endif]b4_locations_if([[
#endif
]])
# b4_location_type_define
# -----------------------
m4_define([b4_location_type_define],
[[/* Location type. */
#if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
typedef struct ]b4_api_PREFIX[LTYPE
typedef struct ]b4_api_PREFIX[LTYPE ]b4_api_PREFIX[LTYPE;
struct ]b4_api_PREFIX[LTYPE
{
int first_line;
int first_column;
int last_line;
int last_column;
} ]b4_api_PREFIX[LTYPE;
};
# define ]b4_api_PREFIX[LTYPE_IS_DECLARED 1
# define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
#endif]])
#endif
]])
# b4_declare_yylstype
# -------------------
# Declarations that might either go into the header (if --defines) or
# in the parser body. Declare YYSTYPE/YYLTYPE, and yylval/yylloc.
m4_define([b4_declare_yylstype],
[b4_value_type_define[]b4_locations_if([
b4_location_type_define])
b4_pure_if([], [[extern ]b4_api_PREFIX[STYPE ]b4_prefix[lval;
]b4_locations_if([[extern ]b4_api_PREFIX[LTYPE ]b4_prefix[lloc;]])])[]dnl
])
# b4_YYDEBUG_define
# ------------------
m4_define([b4_YYDEBUG_define],
[[/* Enabling traces. */
[[/* Debug traces. */
]m4_if(b4_api_prefix, [yy],
[[#ifndef YYDEBUG
# define YYDEBUG ]b4_parse_trace_if([1], [0])[

2
doc/bison.texi
View File

@@ -6092,7 +6092,7 @@ parsers. To comply with this tradition, when @code{api.prefix} is used,
@code{YYDEBUG} (not renamed) is used as a default value:
@example
/* Enabling traces. */
/* Debug traces. */
#ifndef CDEBUG
# if defined YYDEBUG
# if YYDEBUG