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

c++: issue a warning with a value is moved several times

Browse Source 
Suggested by Frank Heckenbach.
http://lists.gnu.org/archive/html/bug-bison/2018-09/msg00022.html

* src/scan-code.l (parse_ref): Check multiple occurrences of rhs
values.
* tests/c++.at (Multiple occurrences of $n and api.value.automove): New.
This commit is contained in:
Akim Demaille
2018-09-20 22:09:25 +02:00
parent 3eb9042a30
commit a874011e37
2 changed files with 48 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
tests/c++.at
View File

@@ -190,6 +190,41 @@ AT_PARSER_CHECK([./list], 0, [],
AT_BISON_OPTION_POPDEFS
AT_CLEANUP
## --------------------------------------------------- ##
## Multiple occurrences of $n and api.value.automove. ##
## --------------------------------------------------- ##
AT_SETUP([Multiple occurrences of $n and api.value.automove])
AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
AT_DATA_GRAMMAR([input.yy],
[[%skeleton "lalr1.cc"
%define api.value.automove
%token <int> NUMBER "number"
%nterm <int> exp
%%
exp:
"number" { $$ = $1; $$; }
| "twice" exp { $$ = $2 + $2; }
| "thrice" exp[val] { $$ = $2 + $val + $2; }
]])
AT_BISON_CHECK([[-fcaret input.yy]], [0], [],
[[input.yy:16.33-34: warning: multiple occurrences of $2 with api.value.automove enabled [-Wother]
| "twice" exp { $$ = $2 + $2; }
^^
input.yy:17.33-36: warning: multiple occurrences of $val with api.value.automove enabled [-Wother]
| "thrice" exp[val] { $$ = $2 + $val + $2; }
^^^^
input.yy:17.40-41: warning: multiple occurrences of $2 with api.value.automove enabled [-Wother]
| "thrice" exp[val] { $$ = $2 + $val + $2; }
^^
]])
AT_BISON_OPTION_POPDEFS
AT_CLEANUP
## ---------- ##
## Variants. ##
@@ -336,7 +371,7 @@ list:
item:
TEXT { $$ = $][1; }
| NUMBER { if ($][1 == 3) YYERROR; else $$ = to_string ($][1); }
| NUMBER { int v = $][1; if (v == 3) YYERROR; else $$ = to_string (v); }
;
%%
]AT_TOKEN_CTOR_IF([],