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https://gitlab.nic.cz/labs/bird.git
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Filter: Implement multiple dispatch for methods
- Extend method descriptors with type signature - Daisy chain method descriptors for the same symbol - Dispatch methods for same symbol based on type signature - Split add/delete/filter operations to multiple methods - Replace ad-hoc dispatch of old-style syntax with scope-based dispatch - Also change method->arg_num to count initial arg It still needs some improvements, like better handling of untyped expressions and better error reporting when no dispatch can be done. The multiple dispatch could also be extended to dispatch regular function-like expressions in a uniform way.
This commit is contained in:
Ondrej Zajicek
parent
c696e3cb8e
commit
cc1099a041
@ -687,7 +687,7 @@ cf_lex_symbol(const char *data)
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return ENUM;
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}
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case SYM_METHOD:
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return sym->method->arg_num ? CF_SYM_METHOD_ARGS : CF_SYM_METHOD_BARE;
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return (sym->method->arg_num > 1) ? CF_SYM_METHOD_ARGS : CF_SYM_METHOD_BARE;
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case SYM_VOID:
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return CF_SYM_UNDEFINED;
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default:
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@ -869,12 +869,12 @@ static_attr:
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term_dot_method: term '.' { f_method_call_start($1); } method_name_cont { f_method_call_end(); $$ = $4; };
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method_name_cont:
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CF_SYM_METHOD_BARE {
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$$ = $1->method->new_inst(FM.object, NULL);
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$$ = f_dispatch_method($1, FM.object, NULL);
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}
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| CF_SYM_METHOD_ARGS {
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f_method_call_args();
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} '(' var_list ')' {
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$$ = $1->method->new_inst(FM.object, $4);
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$$ = f_dispatch_method($1, FM.object, $4);
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}
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;
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@ -913,32 +913,15 @@ term:
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| '-' '-' '-' EMPTY '-' '-' '-' { $$ = f_const_empty(T_LCLIST); }
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| PREPEND '(' term ',' term ')' { $$ = f_new_inst(FI_PATH_PREPEND, $3, $5); }
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| ADD '(' term ',' term ')' {
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switch ($3->type) {
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case T_CLIST: $$ = f_new_inst(FI_CLIST_ADD, $3, $5); break;
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case T_ECLIST: $$ = f_new_inst(FI_ECLIST_ADD, $3, $5); break;
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case T_LCLIST: $$ = f_new_inst(FI_LCLIST_ADD, $3, $5); break;
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default: cf_error("Can't add to type %s", f_type_name($3->type));
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}
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$$ = f_dispatch_method_x("add", $3->type, $3, $5);
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cf_warn("add(x,y) function is deprecated, please use x.add(y)");
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}
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| DELETE '(' term ',' term ')' {
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switch ($3->type) {
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case T_PATH: $$ = f_new_inst(FI_PATH_DEL, $3, $5); break;
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case T_CLIST: $$ = f_new_inst(FI_CLIST_DEL, $3, $5); break;
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case T_ECLIST: $$ = f_new_inst(FI_ECLIST_DEL, $3, $5); break;
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case T_LCLIST: $$ = f_new_inst(FI_LCLIST_DEL, $3, $5); break;
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default: cf_error("Can't delete from type %s", f_type_name($3->type));
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}
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$$ = f_dispatch_method_x("delete", $3->type, $3, $5);
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cf_warn("delete(x,y) function is deprecated, please use x.delete(y)");
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}
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| FILTER '(' term ',' term ')' {
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switch ($3->type) {
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case T_PATH: $$ = f_new_inst(FI_PATH_FILTER, $3, $5); break;
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case T_CLIST: $$ = f_new_inst(FI_CLIST_FILTER, $3, $5); break;
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case T_ECLIST: $$ = f_new_inst(FI_ECLIST_FILTER, $3, $5); break;
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case T_LCLIST: $$ = f_new_inst(FI_LCLIST_FILTER, $3, $5); break;
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default: cf_error("Can't filter type %s", f_type_name($3->type));
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}
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$$ = f_dispatch_method_x("filter", $3->type, $3, $5);
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cf_warn("filter(x,y) function is deprecated, please use x.filter(y)");
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}
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@ -67,7 +67,9 @@ enum f_type {
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struct f_method {
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struct symbol *sym;
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struct f_inst *(*new_inst)(struct f_inst *obj, struct f_inst *args);
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const struct f_method *next;
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uint arg_num;
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enum f_type args_type[];
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};
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/* Filter value; size of this affects filter memory consumption */
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@ -53,6 +53,7 @@ m4_define(FID_NEW_ATTRIBUTES, `m4_divert(110)')
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m4_define(FID_NEW_BODY, `m4_divert(103)')
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m4_define(FID_NEW_METHOD, `m4_divert(111)')
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m4_define(FID_METHOD_CALL, `m4_divert(112)')
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m4_define(FID_TYPE_SIGNATURE, `m4_divert(113)')
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m4_define(FID_DUMP_BODY, `m4_divert(104)m4_define([[FID_DUMP_BODY_EXISTS]])')
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m4_define(FID_LINEARIZE_BODY, `m4_divert(105)')
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m4_define(FID_SAME_BODY, `m4_divert(106)')
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@ -125,7 +126,7 @@ FID_IFCONST([[
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constargs = 0;
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]])
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} while (child$1 = child$1->next);
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m4_define([[INST_METHOD_NUM_ARGS]],m4_eval($1-1))m4_dnl
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m4_define([[INST_METHOD_NUM_ARGS]],$1)m4_dnl
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m4_ifelse($1,1,,[[FID_NEW_METHOD()m4_dnl
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struct f_inst *arg$1 = args;
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if (args == NULL) cf_error("Not enough arguments"); /* INST_NAME */
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@ -183,6 +184,8 @@ m4_define(ARG_TYPE, `ARG_TYPE_STATIC($1,$2) ARG_TYPE_DYNAMIC($1,$2)')
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m4_define(ARG_TYPE_STATIC, `m4_dnl
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m4_ifelse($1,1,[[m4_define([[INST_METHOD_OBJECT_TYPE]],$2)]],)m4_dnl
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FID_TYPE_SIGNATURE()m4_dnl
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method->args_type[m4_eval($1-1)] = $2;
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FID_NEW_BODY()m4_dnl
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if (f$1->type && (f$1->type != ($2)) && !f_const_promotion(f$1, ($2)))
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cf_error("Argument $1 of %s must be of type %s, got type %s",
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@ -230,7 +233,7 @@ FID_NEW_ARGS()m4_dnl
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, struct f_inst * f$1
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FID_NEW_BODY()m4_dnl
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whati->f$1 = f$1;
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m4_define([[INST_METHOD_NUM_ARGS]],m4_eval($1-1))m4_dnl
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m4_define([[INST_METHOD_NUM_ARGS]],$1)m4_dnl
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FID_NEW_METHOD()m4_dnl
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struct f_inst *arg$1 = args;
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if (args == NULL) cf_error("Not enough arguments"); /* INST_NAME */
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@ -421,17 +424,11 @@ m4_undivert(112)
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FID_METHOD_SCOPE_INIT()m4_dnl
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[INST_METHOD_OBJECT_TYPE] = {},
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FID_METHOD_REGISTER()m4_dnl
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sym = cf_new_symbol(&f_type_method_scopes[INST_METHOD_OBJECT_TYPE],
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global_root_scope_pool, global_root_scope_linpool,
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INST_METHOD_NAME);
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sym->class = SYM_METHOD;
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sym->method = method = lp_allocz(global_root_scope_linpool, sizeof(struct f_method));
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*method = (struct f_method) {
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.sym = sym,
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.new_inst = f_new_method_]]INST_NAME()[[,
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.arg_num = INST_METHOD_NUM_ARGS,
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};
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method = lp_allocz(global_root_scope_linpool, sizeof(struct f_method) + INST_METHOD_NUM_ARGS * sizeof(enum f_type));
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method->new_inst = f_new_method_]]INST_NAME()[[;
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method->arg_num = INST_METHOD_NUM_ARGS;
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m4_undivert(113)
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f_register_method(INST_METHOD_OBJECT_TYPE, INST_METHOD_NAME, method);
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]])m4_dnl
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@ -634,10 +631,27 @@ struct sym_scope *f_type_method_scope(enum f_type t)
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return (t < ARRAY_SIZE(f_type_method_scopes)) ? &f_type_method_scopes[t] : NULL;
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}
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static void
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f_register_method(enum f_type t, const byte *name, struct f_method *dsc)
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{
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struct sym_scope *scope = &f_type_method_scopes[t];
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struct symbol *sym = cf_find_symbol_scope(scope, name);
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if (!sym)
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{
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sym = cf_new_symbol(scope, global_root_scope_pool, global_root_scope_linpool, name);
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sym->class = SYM_METHOD;
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}
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dsc->sym = sym;
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dsc->next = sym->method;
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sym->method = dsc;
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}
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void f_type_methods_register(void)
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{
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struct symbol *sym;
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struct f_method *method;
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FID_WR_PUT(13)
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for (uint i = 0; i < ARRAY_SIZE(f_type_method_scopes); i++)
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209
filter/f-inst.c
209
filter/f-inst.c
@ -1246,7 +1246,8 @@
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RESULT(T_PATH, ad, [[ as_path_prepend(fpool, v1.val.ad, v2.val.i) ]]);
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}
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INST(FI_CLIST_ADD, 2, 1) { /* (Extended) Community list add */
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/* Community list add */
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INST(FI_CLIST_ADD, 2, 1) {
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ARG(1, T_CLIST);
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ARG_ANY(2);
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METHOD_CONSTRUCTOR("add");
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@ -1264,47 +1265,54 @@
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runtime("Can't add non-pair");
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}
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INST(FI_ECLIST_ADD, 2, 1) {
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INST(FI_ECLIST_ADD_EC, 2, 1) {
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ARG(1, T_ECLIST);
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ARG_ANY(2);
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ARG(2, T_EC);
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METHOD_CONSTRUCTOR("add");
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/* v2.val is either EC or EC-set */
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if ((v2.type == T_SET) && eclist_set_type(v2.val.t))
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runtime("Can't add set");
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else if (v2.type == T_ECLIST)
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RESULT(T_ECLIST, ad, [[ ec_set_union(fpool, v1.val.ad, v2.val.ad) ]]);
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else if (v2.type != T_EC)
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runtime("Can't add non-ec");
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else
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RESULT(T_ECLIST, ad, [[ ec_set_add(fpool, v1.val.ad, v2.val.ec) ]]);
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RESULT(T_ECLIST, ad, [[ ec_set_add(fpool, v1.val.ad, v2.val.ec) ]]);
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}
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INST(FI_LCLIST_ADD, 2, 1) {
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INST(FI_ECLIST_ADD_ECLIST, 2, 1) {
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ARG(1, T_ECLIST);
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ARG(2, T_ECLIST);
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METHOD_CONSTRUCTOR("add");
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RESULT(T_ECLIST, ad, [[ ec_set_union(fpool, v1.val.ad, v2.val.ad) ]]);
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}
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INST(FI_LCLIST_ADD_LC, 2, 1) {
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ARG(1, T_LCLIST);
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ARG_ANY(2);
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ARG(2, T_LC);
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METHOD_CONSTRUCTOR("add");
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/* v2.val is either LC or LC-set */
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if ((v2.type == T_SET) && lclist_set_type(v2.val.t))
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runtime("Can't add set");
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else if (v2.type == T_LCLIST)
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RESULT(T_LCLIST, ad, [[ lc_set_union(fpool, v1.val.ad, v2.val.ad) ]]);
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else if (v2.type != T_LC)
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runtime("Can't add non-lc");
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else
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RESULT(T_LCLIST, ad, [[ lc_set_add(fpool, v1.val.ad, v2.val.lc) ]]);
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RESULT(T_LCLIST, ad, [[ lc_set_add(fpool, v1.val.ad, v2.val.lc) ]]);
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}
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INST(FI_PATH_DEL, 2, 1) { /* Path delete */
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INST(FI_LCLIST_ADD_LCLIST, 2, 1) {
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ARG(1, T_LCLIST);
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ARG(2, T_LCLIST);
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METHOD_CONSTRUCTOR("add");
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RESULT(T_LCLIST, ad, [[ lc_set_union(fpool, v1.val.ad, v2.val.ad) ]]);
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}
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INST(FI_PATH_DELETE_INT, 2, 1) {
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ARG(1, T_PATH);
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ARG_ANY(2);
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ARG(2, T_INT);
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METHOD_CONSTRUCTOR("delete");
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if ((v2.type == T_SET) && path_set_type(v2.val.t) || (v2.type == T_INT))
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RESULT(T_PATH, ad, [[ as_path_filter(fpool, v1.val.ad, &v2, 0) ]]);
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else
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runtime("Can't delete non-integer (set)");
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RESULT(T_PATH, ad, [[ as_path_filter(fpool, v1.val.ad, &v2, 0) ]]);
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}
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INST(FI_CLIST_DEL, 2, 1) { /* (Extended) Community list add or delete */
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INST(FI_PATH_DELETE_SET, 2, 1) {
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ARG(1, T_PATH);
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ARG(2, T_SET);
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METHOD_CONSTRUCTOR("delete");
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if (!path_set_type(v2.val.t))
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runtime("Mismatched set type");
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RESULT(T_PATH, ad, [[ as_path_filter(fpool, v1.val.ad, &v2, 0) ]]);
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}
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/* Community list delete */
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INST(FI_CLIST_DELETE, 2, 1) {
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ARG(1, T_CLIST);
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ARG_ANY(2);
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METHOD_CONSTRUCTOR("delete");
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@ -1322,76 +1330,119 @@
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runtime("Can't delete non-pair");
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}
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INST(FI_ECLIST_DEL, 2, 1) { /* (Extended) Community list add or delete */
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INST(FI_ECLIST_DELETE_EC, 2, 1) {
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ARG(1, T_ECLIST);
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ARG_ANY(2);
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ARG(2, T_EC);
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METHOD_CONSTRUCTOR("delete");
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/* v2.val is either EC or EC-set */
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if ((v2.type == T_SET) && eclist_set_type(v2.val.t) || (v2.type == T_ECLIST))
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RESULT(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
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else if (v2.type != T_EC)
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runtime("Can't delete non-ec");
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else
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RESULT(T_ECLIST, ad, [[ ec_set_del(fpool, v1.val.ad, v2.val.ec) ]]);
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RESULT(T_ECLIST, ad, [[ ec_set_del(fpool, v1.val.ad, v2.val.ec) ]]);
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}
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INST(FI_LCLIST_DEL, 2, 1) { /* (Extended) Community list add or delete */
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INST(FI_ECLIST_DELETE_ECLIST, 2, 1) {
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ARG(1, T_ECLIST);
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ARG(2, T_ECLIST);
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METHOD_CONSTRUCTOR("delete");
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RESULT(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
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}
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INST(FI_ECLIST_DELETE_SET, 2, 1) {
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ARG(1, T_ECLIST);
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ARG(2, T_SET);
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METHOD_CONSTRUCTOR("delete");
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if (!eclist_set_type(v2.val.t))
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runtime("Mismatched set type");
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RESULT(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
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}
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INST(FI_LCLIST_DELETE_LC, 2, 1) {
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ARG(1, T_LCLIST);
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ARG_ANY(2);
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ARG(2, T_LC);
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METHOD_CONSTRUCTOR("delete");
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/* v2.val is either LC or LC-set */
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if ((v2.type == T_SET) && lclist_set_type(v2.val.t) || (v2.type == T_LCLIST))
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RESULT(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
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else if (v2.type != T_LC)
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runtime("Can't delete non-lc");
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else
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RESULT(T_LCLIST, ad, [[ lc_set_del(fpool, v1.val.ad, v2.val.lc) ]]);
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RESULT(T_LCLIST, ad, [[ lc_set_del(fpool, v1.val.ad, v2.val.lc) ]]);
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}
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INST(FI_PATH_FILTER, 2, 1) { /* (Extended) Community list add or delete */
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INST(FI_LCLIST_DELETE_LCLIST, 2, 1) {
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ARG(1, T_LCLIST);
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ARG(2, T_LCLIST);
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METHOD_CONSTRUCTOR("delete");
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RESULT(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
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}
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INST(FI_LCLIST_DELETE_SET, 2, 1) {
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ARG(1, T_LCLIST);
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ARG(2, T_SET);
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METHOD_CONSTRUCTOR("delete");
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if (!lclist_set_type(v2.val.t))
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runtime("Mismatched set type");
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RESULT(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
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}
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INST(FI_PATH_FILTER_SET, 2, 1) {
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ARG(1, T_PATH);
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ARG_ANY(2);
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ARG(2, T_SET);
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METHOD_CONSTRUCTOR("filter");
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if ((v2.type == T_SET) && path_set_type(v2.val.t))
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RESULT(T_PATH, ad, [[ as_path_filter(fpool, v1.val.ad, &v2, 1) ]]);
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else
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runtime("Can't filter integer");
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}
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if (!path_set_type(v2.val.t))
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runtime("Mismatched set type");
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INST(FI_CLIST_FILTER, 2, 1) {
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RESULT(T_PATH, ad, [[ as_path_filter(fpool, v1.val.ad, &v2, 1) ]]);
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}
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INST(FI_CLIST_FILTER_CLIST, 2, 1) {
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ARG(1, T_CLIST);
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ARG_ANY(2);
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ARG(2, T_CLIST);
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METHOD_CONSTRUCTOR("filter");
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/* Community (or cluster) list */
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struct f_val dummy;
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if ((v2.type == T_SET) && clist_set_type(v2.val.t, &dummy) || (v2.type == T_CLIST))
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RESULT(T_CLIST, ad, [[ clist_filter(fpool, v1.val.ad, &v2, 1) ]]);
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else
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runtime("Can't filter pair");
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RESULT(T_CLIST, ad, [[ clist_filter(fpool, v1.val.ad, &v2, 1) ]]);
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}
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INST(FI_ECLIST_FILTER, 2, 1) {
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||||
INST(FI_CLIST_FILTER_SET, 2, 1) {
|
||||
ARG(1, T_CLIST);
|
||||
ARG(2, T_SET);
|
||||
METHOD_CONSTRUCTOR("filter");
|
||||
|
||||
if (!clist_set_type(v2.val.t, &(struct f_val){}))
|
||||
runtime("Mismatched set type");
|
||||
|
||||
RESULT(T_CLIST, ad, [[ clist_filter(fpool, v1.val.ad, &v2, 1) ]]);
|
||||
}
|
||||
|
||||
INST(FI_ECLIST_FILTER_ECLIST, 2, 1) {
|
||||
ARG(1, T_ECLIST);
|
||||
ARG_ANY(2);
|
||||
ARG(2, T_ECLIST);
|
||||
METHOD_CONSTRUCTOR("filter");
|
||||
/* v2.val is either EC or EC-set */
|
||||
if ((v2.type == T_SET) && eclist_set_type(v2.val.t) || (v2.type == T_ECLIST))
|
||||
RESULT(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
|
||||
else
|
||||
runtime("Can't filter ec");
|
||||
RESULT(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
|
||||
}
|
||||
|
||||
INST(FI_LCLIST_FILTER, 2, 1) {
|
||||
ARG(1, T_LCLIST);
|
||||
ARG_ANY(2);
|
||||
INST(FI_ECLIST_FILTER_SET, 2, 1) {
|
||||
ARG(1, T_ECLIST);
|
||||
ARG(2, T_SET);
|
||||
METHOD_CONSTRUCTOR("filter");
|
||||
/* v2.val is either LC or LC-set */
|
||||
if ((v2.type == T_SET) && lclist_set_type(v2.val.t) || (v2.type == T_LCLIST))
|
||||
RESULT(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
|
||||
else
|
||||
runtime("Can't filter lc");
|
||||
|
||||
if (!eclist_set_type(v2.val.t))
|
||||
runtime("Mismatched set type");
|
||||
|
||||
RESULT(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
|
||||
}
|
||||
|
||||
INST(FI_LCLIST_FILTER_LCLIST, 2, 1) {
|
||||
ARG(1, T_LCLIST);
|
||||
ARG(2, T_LCLIST);
|
||||
METHOD_CONSTRUCTOR("filter");
|
||||
RESULT(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
|
||||
}
|
||||
|
||||
INST(FI_LCLIST_FILTER_SET, 2, 1) {
|
||||
ARG(1, T_LCLIST);
|
||||
ARG(2, T_SET);
|
||||
METHOD_CONSTRUCTOR("filter");
|
||||
|
||||
if (!lclist_set_type(v2.val.t))
|
||||
runtime("Mismatched set type");
|
||||
|
||||
RESULT(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
|
||||
}
|
||||
|
||||
INST(FI_ROA_CHECK_IMPLICIT, 0, 1) { /* ROA Check */
|
||||
|
||||
@ -96,6 +96,8 @@ void f_add_lines(const struct f_line_item *what, struct filter_iterator *fit);
|
||||
|
||||
|
||||
struct filter *f_new_where(struct f_inst *);
|
||||
struct f_inst *f_dispatch_method(struct symbol *sym, struct f_inst *obj, struct f_inst *args);
|
||||
struct f_inst *f_dispatch_method_x(const char *name, enum f_type t, struct f_inst *obj, struct f_inst *args);
|
||||
struct f_inst *f_for_cycle(struct symbol *var, struct f_inst *term, struct f_inst *block);
|
||||
struct f_inst *f_print(struct f_inst *vars, int flush, enum filter_return fret);
|
||||
|
||||
|
||||
@ -30,7 +30,8 @@ filter_name(const struct filter *filter)
|
||||
return filter->sym->name;
|
||||
}
|
||||
|
||||
struct filter *f_new_where(struct f_inst *where)
|
||||
struct filter *
|
||||
f_new_where(struct f_inst *where)
|
||||
{
|
||||
struct f_inst *cond = f_new_inst(FI_CONDITION, where,
|
||||
f_new_inst(FI_DIE, F_ACCEPT),
|
||||
@ -41,6 +42,43 @@ struct filter *f_new_where(struct f_inst *where)
|
||||
return f;
|
||||
}
|
||||
|
||||
static inline int
|
||||
f_match_signature(const struct f_method *dsc, struct f_inst *args)
|
||||
{
|
||||
uint i;
|
||||
|
||||
for (i = 1; args && (i < dsc->arg_num); args = args->next, i++)
|
||||
if (dsc->args_type[i] && (args->type != dsc->args_type[i]))
|
||||
return 0;
|
||||
|
||||
return !args && !(i < dsc->arg_num);
|
||||
}
|
||||
|
||||
struct f_inst *
|
||||
f_dispatch_method(struct symbol *sym, struct f_inst *obj, struct f_inst *args)
|
||||
{
|
||||
/* Note! We should revert args */
|
||||
|
||||
for (const struct f_method *dsc = sym->method; dsc; dsc = dsc->next)
|
||||
if (f_match_signature(dsc, args))
|
||||
return dsc->new_inst(obj, args);
|
||||
|
||||
cf_error("Cannot dispatch method '%s'", sym->name);
|
||||
}
|
||||
|
||||
struct f_inst *
|
||||
f_dispatch_method_x(const char *name, enum f_type t, struct f_inst *obj, struct f_inst *args)
|
||||
{
|
||||
struct sym_scope *scope = f_type_method_scope(t);
|
||||
struct symbol *sym = cf_find_symbol_scope(scope, name);
|
||||
|
||||
if (!sym)
|
||||
cf_error("Cannot dispatch method '%s'", name);
|
||||
|
||||
return f_dispatch_method(sym, obj, args);
|
||||
}
|
||||
|
||||
|
||||
struct f_inst *
|
||||
f_for_cycle(struct symbol *var, struct f_inst *term, struct f_inst *block)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user