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Don't miss %merge result type warnings just because the LHS types are

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declared after the %merge.
* src/reader.c (get_merge_function): Don't set the merger type yet.
(record_merge_function_type): New function for setting the merger type
and checking for clashes.
(grammar_current_rule_merge_set): Set the location of the %merge for
the current rule.
(packgram): Invoke record_merge_function_type for each rule now that
all symbol type declarations have been parsed.
* src/reader.h (merger_list.type_declaration_location): New member
storing the location of the first %merge from which the type for this
merging function was derived.
* src/symlist.h (symbol_list.merger_declaration_location): New member
storing the location of a rule's %merge, if any.
* tests/glr-regression.at (Missed %merge type warnings when LHS type is
declared later): New test to catch the error fixed by the above patch.
This commit is contained in:
Joel E. Denny
2006-06-26 04:45:24 +00:00
parent ad6b1efa2f
commit 8ee5b53874
5 changed files with 127 additions and 15 deletions
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55
tests/glr-regression.at
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@@ -1661,3 +1661,58 @@ AT_CHECK([[./glr-regr17]], 0, [],
])
AT_CLEANUP
## -------------------------------------------------------------##
## Missed %merge type warnings when LHS type is declared later. ##
## -------------------------------------------------------------##
AT_SETUP([Missed %merge type warnings when LHS type is declared later])
AT_DATA_GRAMMAR([glr-regr18.y],
[[%glr-parser
%{
static void yyerror (char const *);
static int yylex ();
%}
%union {
int type1;
int type2;
}
%%
sym1: sym2 %merge<merge> { $$ = $1; } ;
sym2: %merge<merge> { $$ = 0; } ;
%type <type1> sym1;
%type <type2> sym2;
%%
static void
yyerror (char const *msg)
{
fprintf (stderr, "%s\n", msg);
}
static int
yylex ()
{
return 0;
}
int
main (void)
{
return yyparse ();
}
]])
AT_CHECK([[bison -o glr-regr18.c glr-regr18.y]], 0, [],
[glr-regr18.y:26.13-19: warning: result type clash on merge function `merge': <type2> != <type1>
glr-regr18.y:25.18-24: warning: first declaration
])
AT_CLEANUP