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* NEWS: Instead of %union, you can define and use your own union type

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YYSTYPE if your grammar contains at least one <type> tag.
Your YYSTYPE need not be a macro; it can be a typedef.
* doc/bison.texinfo (Value Type, Multiple Types, Location Type):
(Union Decl, Decl Summary): Document this.
* data/glr.c (YYSTYPE): Implement this.
* data/glr.cc (YYSTYPE): Likewise.
* data/lalr1.cc (YYSTYPE): Likewise.
* data/yacc.c (YYSTYPE): Likewise.
* src/output.c (prepare): Output tag_seen_flag.
* src/parse-gram.y (declaration, grammar_declaration):
Use 'union_seen' rather than 'typed' to determine whether
%union has been seen, since grammars can now be typed without
%union.
(symbol_declaration, type.opt, symbol_def):
Keep track of whether a tag has been seen.
* src/reader.c (union_seen, tag_seen): New vars.
(typed): remove.
* src/reader.h (union_seen, tag_seen, typed): Likewise.
* src/scan-code.l (untyped_var_seen): New variable.
(handle_action_dollar): Adjust to above changes.
(handle_action_dollar, handle_action_at):
Improve overflow checking for outlandish numbers.
* tests/input.at (AT_CHECK_UNUSED_VALUES): Redo test to
avoid new diagnostics generated by above changes.
* tests/regression.at (YYSTYPE typedef): Add test to check
for type tags without %union.
This commit is contained in:
Paul Eggert
2006-07-09 20:36:33 +00:00
parent b37acfe18c
commit ddc8ede1ab
14 changed files with 229 additions and 84 deletions
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38
tests/input.at
View File

@@ -107,12 +107,12 @@ c: INT | INT { $]1[ } INT { } INT { };
d: INT | INT { } INT { $]1[ } INT { };
e: INT | INT { } INT { } INT { $]1[ };
f: INT | INT { } INT { } INT { $]$[ = $]1[ + $]3[ + $]5[; };
g: INT | INT { $]$[ } INT { $]$[ } INT { };
h: INT | INT { $]$[ } INT { $]$[ = $]2[ } INT { };
g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
i: INT | INT INT { } { $]$[ = $]1[ + $]2[; };
j: INT | INT INT { $<integer>$ = 1; } { $]$[ = $]1[ + $]2[; };
k: INT | INT INT { $]$[; } { $]$[ = $]3[; } { };
l: INT | INT { $]$[ = $]1[; } INT { $]$[ = $]2[ + $]3[; } INT { $]$[ = $]4[ + $]5[; };]]m4_ifval($1, [
k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
l: INT | INT { $<integer>$ = $<integer>1; } INT { $<integer>$ = $<integer>2 + $<integer>3; } INT { $<integer>$ = $<integer>4 + $<integer>5; };]]m4_ifval($1, [
_AT_UNUSED_VALUES_DECLARATIONS])
)
@@ -131,22 +131,22 @@ input.y:14.10-35: warning: unused value: $]5[
input.y:15.10-36: warning: unset value: $]$[
input.y:15.10-36: warning: unused value: $]3[
input.y:15.10-36: warning: unused value: $]5[
input.y:17.10-38: warning: unset value: $]$[
input.y:17.10-38: warning: unused value: $]1[
input.y:17.10-38: warning: unused value: $]2[
input.y:17.10-38: warning: unused value: $]3[
input.y:17.10-38: warning: unused value: $]4[
input.y:17.10-38: warning: unused value: $]5[
input.y:18.10-43: warning: unset value: $]$[
input.y:18.10-43: warning: unused value: $]1[
input.y:18.10-43: warning: unused value: $]3[
input.y:18.10-43: warning: unused value: $]4[
input.y:18.10-43: warning: unused value: $]5[
input.y:17.10-58: warning: unset value: $]$[
input.y:17.10-58: warning: unused value: $]1[
input.y:17.10-58: warning: unused value: $]2[
input.y:17.10-58: warning: unused value: $]3[
input.y:17.10-58: warning: unused value: $]4[
input.y:17.10-58: warning: unused value: $]5[
input.y:18.10-72: warning: unset value: $]$[
input.y:18.10-72: warning: unused value: $]1[
input.y:18.10-72: warning: unused value: $]3[
input.y:18.10-72: warning: unused value: $]4[
input.y:18.10-72: warning: unused value: $]5[
input.y:20.10-55: warning: unused value: $]3[
input.y:21.10-41: warning: unset value: $]$[
input.y:21.10-41: warning: unused value: $]1[
input.y:21.10-41: warning: unused value: $]2[
input.y:21.10-41: warning: unused value: $]4[
input.y:21.10-68: warning: unset value: $]$[
input.y:21.10-68: warning: unused value: $]1[
input.y:21.10-68: warning: unused value: $]2[
input.y:21.10-68: warning: unused value: $]4[
]])])

27
tests/regression.at
View File

@@ -49,6 +49,33 @@ AT_CLEANUP
## ----------------- ##
## YYSTYPE typedef. ##
## ----------------- ##
AT_SETUP([YYSTYPE typedef])
AT_DATA_GRAMMAR([input.y],
[[%{
void yyerror (char const *);
int yylex (void);
typedef union { char const *val; } YYSTYPE;
%}
%type <val> program
%%
program: { $$ = ""; };
]])
AT_CHECK([bison -o input.c input.y])
AT_COMPILE([input.o], [-c input.c])
AT_CLEANUP
## ------------------------------------- ##
## Early token definitions with --yacc. ##
## ------------------------------------- ##