6904a8120b
.. mostly mentions in mjsunit `Flags:` lines and in comments. Bug: v8:10386 Change-Id: If79dfdc448d0a3f19883ef1f816e77e750cb4061 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865964 Commit-Queue: Jakob Linke <jgruber@chromium.org> Reviewed-by: Michael Achenbach <machenbach@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/main@{#82852}
43 lines
1.9 KiB
JavaScript
43 lines
1.9 KiB
JavaScript
// Copyright 2019 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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d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
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// We generate the module bytes once to make this test more efficient,
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// especially on simulator builds. The bytes contain a sentinel which is later
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// patched to different constants. This makes the modules distinct and forces
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// the engine to create different code for them.
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// This is the sentinel placed in the bytes. It's a 5 byte LEB-encoded integer.
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const sentinel = wasmSignedLeb(0x12345678);
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assertEquals(5, sentinel.length);
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const builder = new WasmModuleBuilder();
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builder.addFunction('f', kSig_i_i).addBody([kExprI32Const, ...sentinel]);
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const module_bytes = builder.toBuffer();
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// Checks whether {module_bytes[i .. i+sentinel.length]} matches {sentinel}.
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const has_sentinel = (i, k = 0) => module_bytes[i + k] == sentinel[k] &&
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(k == sentinel.length - 1 || has_sentinel(i, k + 1));
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// Now find the sentinel.
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const find_sentinel = i =>
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module_bytes.slice(i).findIndex((e, i) => has_sentinel(i));
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const sentinel_position = find_sentinel(0);
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assertTrue(has_sentinel(sentinel_position), 'found sentinel');
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assertEquals(-1, find_sentinel(sentinel_position + 1), 'exactly one sentinel');
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// Generating {num_modules} modules should not run out of memory, since the code
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// space needed per module is quite low.
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const num_modules = 10000;
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// Keep all generated modules alive.
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const modules = [];
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// Reset sentinel section to nops so that shorter LEBs will just be followed by
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// nops. This resion will be patched in the loop with values of increasing size.
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module_bytes.set(Array(sentinel.length).fill(_ => kExprNop), sentinel_position);
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for (let i = 0; i < num_modules; ++i) {
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if (i % 50 == 0) print(i);
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module_bytes.set(wasmSignedLeb(i), sentinel_position);
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modules.push(new WebAssembly.Module(module_bytes));
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}
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