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68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
// Copyright 2018 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: --allow-natives-syntax
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load('test/mjsunit/wasm/wasm-constants.js');
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load('test/mjsunit/wasm/wasm-module-builder.js');
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// The number of locals must be greater than the constant defined here:
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// https://cs.chromium.org/chromium/src/v8/src/compiler/x64/code-generator-x64.cc?l=3146
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const kNumLocals = 128;
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function varuint32(val) {
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let bytes = [];
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for (let i = 0; i < 4; ++i) {
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bytes.push(0x80 | ((val >> (7 * i)) & 0x7f));
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}
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bytes.push((val >> (7 * 4)) & 0x7f);
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return bytes;
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}
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// Generate a function that calls the "get" import `kNumLocals` times, and
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// stores each result in a local, then calls the "call" import `kNumLocals`
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// times with the stored local values.
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//
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// The intention is to create a function that has a large stack frame.
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let body = [];
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for (let i = 0; i < kNumLocals; ++i) {
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body.push(kExprCallFunction, 0, kExprSetLocal, ...varuint32(i));
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}
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for (let i = 0; i < kNumLocals; ++i) {
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body.push(kExprGetLocal, ...varuint32(i), kExprCallFunction, 1);
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}
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let builder = new WasmModuleBuilder();
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builder.addImport('mod', 'get', kSig_i_v);
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builder.addImport('mod', 'call', kSig_v_i);
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builder.
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addFunction('main', kSig_v_v).
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addLocals({i32_count: kNumLocals}).
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addBody(body).
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exportAs('main');
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let m1_bytes = builder.toBuffer();
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let m1 = new WebAssembly.Module(m1_bytes);
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// Serialize the module and postMessage it to another thread.
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let serialized_m1 = %SerializeWasmModule(m1);
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let worker_onmessage = function(msg) {
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let {serialized_m1, m1_bytes} = msg;
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let m1_clone = %DeserializeWasmModule(serialized_m1, m1_bytes);
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let imports = {mod: {get: () => 3, call: () => {}}};
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let i2 = new WebAssembly.Instance(m1_clone, imports);
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i2.exports.main();
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postMessage('done');
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}
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let workerScript = "onmessage = " + worker_onmessage.toString();
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let worker = new Worker(workerScript, {type: 'string'});
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worker.postMessage({serialized_m1, m1_bytes});
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// Wait for worker to finish.
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print(worker.getMessage());
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