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warnings: raise warning for useless printers or destructors

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* src/scan-code.h (code_props): Add field 'is_used'.
(CODE_PROPS_NONE_INIT): Adjust.
* src/scan-code.l (code_props_plain_init, code_props_symbol_action_init)
(code_props_rule_action_init): Instead of implementing several
times the initialization of the code_props structures,
use code_props_none_init.
* src/symtab.c (symbol_check_defined): If a symbol does not have a
destructor (resp. printer) but has a type which has a destructor (resp.
printer), then set field 'is_used' to true.
(semantic_type_check_defined): If a type has a destructor (resp. printer)
but all symbols of this type have already a destructor (resp. printer),
then raise a warning.
* tests/input.at (Useless printers or destructors): New.

Signed-off-by: Akim Demaille <akim@lrde.epita.fr>
This commit is contained in:
Victor Santet
2012-06-14 14:20:07 +02:00
committed by Akim Demaille
parent 9641b918ba
commit ea9a35c605
5 changed files with 96 additions and 10 deletions
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45
tests/input.at
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@@ -323,6 +323,51 @@ input.y:5.25-31: warning: type <type4> is used, but is not associated to any sym
AT_CLEANUP
## --------------------------------- ##
## Useless printers or destructors. ##
## --------------------------------- ##
AT_SETUP([Useless printers or destructors])
AT_DATA([[input.y]],
[[%token <type1> token1
%token <type2> token2
%token <type3> token3
%token <type4> token4
%token <type5> token51 token52
%token <type6> token61 token62
%token <type7> token7
%printer {} token1
%destructor {} token2
%printer {} token51
%destructor {} token61
%printer {} token7
%printer {} <type1>
%destructor {} <type2>
%printer {} <type3>
%destructor {} <type4>
%printer {} <type5>
%destructor {} <type6>
%destructor {} <type7>
%%
exp: "a";
]])
AT_BISON_CHECK([input.y], [0], [],
[[input.y:16.13-19: warning: useless %printer for type <type1>
input.y:17.16-22: warning: useless %destructor for type <type2>
]])
AT_CLEANUP
## ---------------------------------------- ##
## Unused values with default %destructor. ##
## ---------------------------------------- ##