/* Copyright 2021 Mozilla Foundation
*
* Licensed under the Apache License , Version 2 . 0 ( the " License " ) ;
* you may not use this file except in compliance with the License .
* You may obtain a copy of the License at
*
* http : //www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing , software
* distributed under the License is distributed on an " AS IS " BASIS ,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND , either express or implied .
* See the License for the specific language governing permissions and
* limitations under the License .
*/
// ./test/core/br_on_null.wast
// ./test/core/br_on_null.wast:1
let $0 = instantiate(`(module
(type \$t (func (result i32)))
(func \$nn (param \$r (ref \$t)) (result i32)
(block \$l
(return (call_ref \$t (br_on_null \$l (local.get \$r))))
)
(i32.const -1 )
)
(func \$n (param \$r (ref null \$t)) (result i32)
(block \$l
(return (call_ref \$t (br_on_null \$l (local.get \$r))))
)
(i32.const -1 )
)
(elem func \$f)
(func \$f (result i32) (i32.const 7 ))
(func (export "nullable-null" ) (result i32) (call \$n (ref.null \$t)))
(func (export "nonnullable-f" ) (result i32) (call \$nn (ref.func \$f)))
(func (export "nullable-f" ) (result i32) (call \$n (ref.func \$f)))
(func (export "unreachable" ) (result i32)
(block \$l
(return (call_ref \$t (br_on_null \$l (unreachable))))
)
(i32.const -1 )
)
)`);
// ./test/core/br_on_null.wast:32
assert_trap(() => invoke($0 , `unreachable`, []), `unreachable`);
// ./test/core/br_on_null.wast:34
assert_return(() => invoke($0 , `nullable-null `, []), [value("i32" , -1 )]);
// ./test/core/br_on_null.wast:35
assert_return(() => invoke($0 , `nonnullable-f`, []), [value("i32" , 7 )]);
// ./test/core/br_on_null.wast:36
assert_return(() => invoke($0 , `nullable-f`, []), [value("i32" , 7 )]);
// ./test/core/br_on_null.wast:38
let $1 = instantiate(`(module
(type \$t (func))
(func (param \$r (ref null \$t)) (drop (br_on_null 0 (local.get \$r))))
(func (param \$r (ref null func)) (drop (br_on_null 0 (local.get \$r))))
(func (param \$r (ref null extern)) (drop (br_on_null 0 (local.get \$r))))
)`);
// ./test/core/br_on_null.wast:46
let $2 = instantiate(`(module
(type \$t (func (param i32) (result i32)))
(elem func \$f)
(func \$f (param i32) (result i32) (i32.mul (local.get 0 ) (local.get 0 )))
(func \$a (param \$n i32) (param \$r (ref null \$t)) (result i32)
(block \$l (result i32)
(return (call_ref \$t (br_on_null \$l (local.get \$n) (local.get \$r))))
)
)
(func (export "args-null" ) (param \$n i32) (result i32)
(call \$a (local.get \$n) (ref.null \$t))
)
(func (export "args-f" ) (param \$n i32) (result i32)
(call \$a (local.get \$n) (ref.func \$f))
)
)`);
// ./test/core/br_on_null.wast:65
assert_return(() => invoke($2 , `args-null `, [3 ]), [value("i32" , 3 )]);
// ./test/core/br_on_null.wast:66
assert_return(() => invoke($2 , `args-f`, [3 ]), [value("i32" , 9 )]);
// ./test/core/br_on_null.wast:81
assert_invalid(
() => instantiate(`(module
(type \$t (func))
(func \$f (param (ref null \$t)) (result funcref) (local.get 0 ))
(func (param funcref) (result funcref)
(ref.null \$t)
(local.get 0 )
(br_on_null 0 ) ;; only leaves two funcref's on the stack
(drop)
(call \$f)
)
)`),
`type mismatch`,
);
Messung V0.5 in Prozent C=84 H=100 G=92
¤ Dauer der Verarbeitung: 0.24 Sekunden
(vorverarbeitet am 2026-08-26)
¤
*© Formatika GbR, Deutschland