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09a8440b45
PR-URL: https://github.com/nodejs/node/pull/51362 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
// Copyright 2023 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --mock-arraybuffer-allocator --allow-natives-syntax
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function Asm(stdlib, foreign, buffer) {
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"use asm";
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var i32 = new stdlib.Int32Array(buffer);
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function get(index) {
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index = index|0;
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return i32[index >> 2] | 0;
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}
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return { get: get };
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}
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var heap;
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var allocation_succeeded = false;
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try {
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heap = new ArrayBuffer(0x8200_0000);
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allocation_succeeded = true;
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} catch (e) {
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// On 32-bit platforms, the allocation will fail. Just skip the rest.
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assertTrue(e instanceof RangeError);
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}
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(function CheckValidModule() {
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var small_heap = new ArrayBuffer(64*1024);
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Asm(globalThis, null, small_heap);
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// With a small heap, the asm.js module is valid.
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assertTrue(%IsAsmWasmCode(Asm));
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})();
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if (allocation_succeeded) {
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console.log("allocation successful, running actual test");
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var fast = Asm(this, null, heap);
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// If we checked %IsAsmWasmCode(Asm) here, it would return false, because
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// our fix for >2GiB addresses current consists of throwing such modules
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// off the Asm fast path. But that's an implementation detail, so we don't
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// want to assertFalse(...) that here either.
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// This is an OOB access that should return 0 without trying to read from
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// the actual ArrayBuffer (which is inaccessible due to this test using
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// the mock allocator).
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// To make this test meaningful without the mock allocator, write a
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// recognizable value into the buffer, e.g.:
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// let u8 = new Uint8Array(heap);
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// u8[0x8000_0000] = 42;
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// The call below should then still return 0, not 42.
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assertEquals(0, fast.get(-0x8000_0000));
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}
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