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Filter: Add separate instruction for uninitialized variable declaration

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The previous approach (use VOID constant for variable initialization)
failed due to dynamic type check failure.

Thanks to Alexander Zubkov <green@qrator.net> for the bugreport.
This commit is contained in:
Ondrej Zajicek 2023-08-25 23:14:36 +02:00
parent 116285f2b0
commit cce48c6cdd
3 changed files with 22 additions and 10 deletions
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16
filter/config.Y
View File

@ -324,7 +324,7 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
%nonassoc ELSE
%type <xp> cmds_int cmd_prep
%type <x> term term_bs cmd cmd_var cmds cmds_scoped constant constructor print_list var var_init var_list function_call symbol_value bgp_path_expr bgp_path bgp_path_tail
%type <x> term term_bs cmd cmd_var cmds cmds_scoped constant constructor print_list var var_list function_call symbol_value bgp_path_expr bgp_path bgp_path_tail
%type <fda> dynamic_attr
%type <fsa> static_attr
%type <f> filter where_filter
@ -895,16 +895,16 @@ print_list: /* EMPTY */ { $$ = NULL; }
}
;
var_init:
/* empty */ { $$ = f_new_inst(FI_CONSTANT, (struct f_val) { }); }
| '=' term { $$ = $2; }
;
var:
type symbol var_init ';' {
type symbol '=' term ';' {
struct symbol *sym = cf_define_symbol($2, SYM_VARIABLE | $1, offset, f_new_var(sym_->scope));
$$ = f_new_inst(FI_VAR_INIT, $3, sym);
$$ = f_new_inst(FI_VAR_INIT, $4, sym);
}
| type symbol ';' {
struct symbol *sym = cf_define_symbol($2, SYM_VARIABLE | $1, offset, f_new_var(sym_->scope));
$$ = f_new_inst(FI_VAR_INIT0, sym);
}
;
for_var:
type symbol { $$ = cf_define_symbol($2, SYM_VARIABLE | $1, offset, f_new_var(sym_->scope)); }

12
filter/f-inst.c
View File

@ -506,6 +506,7 @@
RESULT(T_BOOL, i, ipa_is_ip4(v1.val.ip));
}
/* Add initialized variable */
INST(FI_VAR_INIT, 1, 0) {
NEVER_CONSTANT;
ARG_ANY(1);
@ -518,6 +519,17 @@
fstk->vcnt = pos + 1;
}
/* Add uninitialized variable */
INST(FI_VAR_INIT0, 0, 0) {
NEVER_CONSTANT;
SYMBOL;
/* New variable is always the last on stack */
uint pos = curline.vbase + sym->offset;
fstk->vstk[pos] = (struct f_val) { };
fstk->vcnt = pos + 1;
}
/* Set to indirect value prepared in v1 */
INST(FI_VAR_SET, 1, 0) {
NEVER_CONSTANT;

4
filter/test.conf
View File

@ -630,8 +630,8 @@ bt_test_suite(t_prefix_set, "Testing prefix sets");
*/
function t_prefix6()
prefix px;
{
prefix px;
px = 1020::/18;
bt_assert(format(px) = "1020::/18");
bt_assert(1020:3040:5060:: ~ 1020:3040:5000::/40);
@ -976,8 +976,8 @@ bt_test_suite(t_clist, "Testing lists of communities");
*/
function t_ec()
ec cc;
{
ec cc;
cc = (rt, 12345, 200000);
bt_assert(format(cc) = "(rt, 12345, 200000)");