1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
// Copyright 2023 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --experimental-wasm-stringref --allow-natives-syntax
d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
let builder = new WasmModuleBuilder();
let sig_w_w = makeSig([kWasmStringRef], [kWasmStringRef]);
let toLowerCase = builder.addImport("m", "toLowerCase", sig_w_w);
builder.addFunction('call_tolower', sig_w_w).exportFunc().addBody([
kExprLocalGet, 0,
kExprCallFunction, toLowerCase,
]);
let module = builder.toModule();
let recognizable = Function.prototype.call.bind(String.prototype.toLowerCase);
let recognizable_imports = { m: { toLowerCase: recognizable } };
let instance1 = new WebAssembly.Instance(module, recognizable_imports);
let call_tolower = instance1.exports.call_tolower;
assertEquals("abc", call_tolower("ABC"));
%WasmTierUpFunction(call_tolower);
assertEquals("abc", call_tolower("ABC"));
// Null should be handled correctly (by throwing the same TypeError that
// JavaScript would throw).
assertThrows(
() => call_tolower(null), TypeError,
/String.prototype.toLowerCase called on null or undefined/);
// Creating a second instance with identical imports should not cause
// recompilation.
console.log("Second instance.");
let instance2 = new WebAssembly.Instance(module, recognizable_imports);
assertEquals("def", instance2.exports.call_tolower("DEF"));
// Creating a third instance with different imports must not reuse the
// existing optimized code.
console.log("Third instance.");
let other_imports = { m: { toLowerCase: () => "foo" } };
let instance3 = new WebAssembly.Instance(module, other_imports);
assertEquals("foo", instance3.exports.call_tolower("GHI"));
assertEquals("def", instance2.exports.call_tolower("DEF"));
assertEquals("abc", instance1.exports.call_tolower("ABC"));
|
