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Implement comma expressions

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Doesn't quite work (attempt to suppress warning for return a = 3, 5;
failed).
This commit is contained in:
Bill Currie 2019-06-09 16:56:20 +09:00
parent 689d1ad3ec
commit 7fce68649a
3 changed files with 76 additions and 4 deletions
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20
tools/qfcc/source/qc-parse.y
View file

@ -180,7 +180,7 @@ int yylex (void);
%type <symbol> methoddef
%type <expr> opt_initializer var_initializer local_def
%type <expr> opt_init opt_expr fexpr expr element_list element
%type <expr> opt_init opt_expr cexpr fexpr expr element_list element
%type <expr> optional_state_expr texpr vector_expr
%type <expr> statement statements compound_statement
%type <expr> else label break_label continue_label
@ -1175,7 +1175,7 @@ statement
break_label = $2;
continue_label = $3;
}
| fexpr ';'
| cexpr ';'
{
$$ = $1;
}
@ -1227,7 +1227,7 @@ switch_block
;
opt_init
: fexpr
: cexpr
| type init_var_decl_list { $$ = $2; }
| /* empty */
{
@ -1260,7 +1260,7 @@ init_var_decl
;
opt_expr
: fexpr
: cexpr
| /* empty */
{
$$ = 0;
@ -1346,6 +1346,18 @@ texpr
: fexpr { $$ = convert_bool ($1, 1); }
;
cexpr
: arg_list
{
if ($1->next) {
expr_t *res = $1;
$1 = build_block_expr ($1->next);
$1->e.block.result = res;
}
$$ = $1;
}
;
opt_arg_list
: /* emtpy */ { $$ = 0; }
| arg_list { $$ = $1; }

10
tools/qfcc/test/Makefile.am
View file

@ -31,6 +31,7 @@ fail_bins=
test_progs_dat=\
chewed-alias.dat \
chewed-return.dat \
comma-expr.dat \
deadbool.dat \
fordecl.dat \
func-expr.dat \
@ -89,6 +90,15 @@ chewed-return.run: Makefile build-run
include ./$(DEPDIR)/chewed-return.Qo # am--include-marker
r_depfiles_remade += ./$(DEPDIR)/chewed-return.Qo
comma_expr_dat_SOURCES=comma-expr.r
comma_expr_obj=$(comma_expr_dat_SOURCES:.r=.qfo)
comma-expr.dat$(EXEEXT): $(comma_expr_obj) $(QFCC_DEP)
$(QFCC) $(QCFLAGS) -o $@ $(comma_expr_obj)
comma-expr.run: Makefile build-run
$(srcdir)/build-run $@
include ./$(DEPDIR)/comma-expr.Qo # am--include-marker
r_depfiles_remade += ./$(DEPDIR)/comma-expr.Qo
deadbool_dat_SOURCES=deadbool.r
deadbool_obj=$(deadbool_dat_SOURCES:.r=.qfo)
deadbool.dat$(EXEEXT): $(deadbool_obj) $(QFCC_DEP)

50
tools/qfcc/test/comma-expr.r Normal file
View file

@ -0,0 +1,50 @@
void printf (string fmt, ...) = #0;
int a = 0;
int b = 0;
int
return_comma()
{
return a = 3, 5;
}
int
test_for_comma ()
{
int fail = 1;
int count = 5;
int i = -1;
float j = -1;
for (i = 3, j = 5; count-- > 0; ) {
i += 2;
j += 3;
}
if (i == 13 && j == 20) {
fail = 0;
}
return fail;
}
int
test_comma ()
{
int fail = 1;
if (return_comma() == 5) {
if (a == 3) {
fail = 0;
}
}
return fail;
}
int
main ()
{
int fail = 0;
fail |= test_comma ();
fail |= test_for_comma ();
return fail;
}