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

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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
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21
src/scan-code.l
View File

@@ -439,26 +439,22 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
if ('[' == *cp)
{
/* Ignore the brackets. */
char *p;
for (p = ++cp; *p != ']'; ++p)
for (cp_end = ++cp; *cp_end != ']'; ++cp_end)
continue;
cp_end = p;
explicit_bracketing = true;
}
else
{
/* Take all characters of the name. */
char* p;
for (p = cp; *p; ++p)
for (char* p = cp; *p; ++p)
if (is_dot_or_dash (*p))
{
ref_tail_fields = p;
break;
}
for (p = cp; *p; ++p)
for (cp_end = cp; *cp_end; ++cp_end)
continue;
cp_end = p;
explicit_bracketing = false;
}
@@ -705,8 +701,15 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
obstack_quote (&obstack_for_string, type_name);
obstack_sgrow (&obstack_for_string, ")[");
if (0 < n)
symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
true;
{
symbol_list *sym = symbol_list_n_get (effective_rule, n);
if (muscle_percent_define_ifdef ("api.value.automove")
&& sym->action_props.is_value_used)
complain (&dollar_loc, Wother,
_("multiple occurrences of $%s with api.value.automove enabled"),
cp);
sym->action_props.is_value_used = true;
}
break;
}
}

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([],