40 lines
1.4 KiB
JavaScript
40 lines
1.4 KiB
JavaScript
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// 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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// Flags: --allow-natives-syntax --noturbo-inlining --noturbo-verify-allocation
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// Ensure that very large stack frames can be used successfully.
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// The flag --noturbo-verify-allocation is to make this run a little faster; it
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// shouldn't affect the behavior.
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const frame_size = 4096 * 4; // 4 pages
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const num_locals = frame_size / 8; // Assume 8-byte floating point values
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function f() { return 0.1; }
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// Function g, on positive inputs, will call itself recursively. On negative
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// inputs, it does a computation that requires a large number of locals.
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// The flag --noturbo-inlining is important to keep the compiler from realizing
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// that all of this work is for nothing.
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let g_text = "if (input === 0) return; if (input > 0) return g(input - 1);";
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g_text += " var inc = f(); var a0 = 0;";
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for (let i = 1; i < num_locals; ++i) {
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g_text += " var a" + i + " = a" + (i - 1) + " + inc;";
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}
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g_text += " return f(a0";
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for (let i = 1; i < num_locals; ++i) {
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g_text += ", a" + i;
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}
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g_text += ");";
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const g = new Function("input", g_text);
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%PrepareFunctionForOptimization(g);
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g(1);
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g(-1);
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%OptimizeFunctionOnNextCall(g);
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// Use recursion to get past whatever stack space is already committed.
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// 20 * 16kB = 320kB, comfortably below the default 1MB stack reservation limit.
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g(20);
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