Future/bison
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/bison.git synced 2026-03-09 12:23:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

Parameterize the extraction of semantic values.

Browse Source 
To make future changes easier, no longer rely on ".TYPE" being the
way to get a semantic value.

	* data/c.m4 (b4_symbol_value): New.
	Use it.
	* data/c++.m4, data/yacc.c: Use it.
	* data/glr.c: Use b4_symbol_value.
	(b4_rhs_data): New.
	Use it.
This commit is contained in:
Akim Demaille
2008-10-21 17:20:22 -05:00
parent 91ba8a55b1
commit 1fa5d8bbf9
5 changed files with 45 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
data/c.m4
View File

@@ -205,6 +205,21 @@ m4_define([b4_token_enums_defines],
])
## ----------------- ##
## Semantic Values. ##
## ----------------- ##
# b4_symbol_value(VAL, [TYPE])
# ----------------------------
# Given a semantic value VAL ($$, $1 etc.), extract its value of type
# TYPE if TYPE is given, otherwise just return VAL. The result can be
# used safetly, it is put in parens to avoid nasty precedence issues.
# TYPE is *not* put in braces, provide some if needed.
m4_define([b4_symbol_value],
[($1[]m4_ifval([$2], [.$2]))])
## --------------------------------------------- ##
## Defining C functions in both K&R and ANSI-C. ##
@@ -360,7 +375,7 @@ $2
# -------------------------------------------------
m4_define([b4_symbol_actions],
[m4_pushdef([b4_dollar_dollar],
[m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
[b4_symbol_value([(*yyvaluep)], [$6])])dnl
m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
case $4: /* $3 */
b4_syncline([$2], [$1])