forked from LeenkxTeam/Kmake
41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
// Copyright 2024 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 --sandbox-testing
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const kJSFunctionType = Sandbox.getInstanceTypeIdFor('JS_FUNCTION_TYPE');
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const kJSFunctionDispatchHandleOffset = Sandbox.getFieldOffset(kJSFunctionType, 'dispatch_handle');
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let memory = new DataView(new Sandbox.MemoryView(0, 0x100000000));
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let params = [];
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for (let i = 1; i <= 10000; i++) {
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params.push(`a${i}`);
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}
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let body = 'return 42;';
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let f1 = new Function(...params, body);
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%PrepareFunctionForOptimization(f1);
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f1();
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%OptimizeFunctionOnNextCall(f1);
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f1();
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let f2 = new Function('a', 'b', 'c', 'return 43;');
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%PrepareFunctionForOptimization(f2);
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f2();
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%OptimizeFunctionOnNextCall(f2);
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f2();
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// Transplant the dispatch handle from one function to another.
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// This should simply result in the execution of different (but valid) code.
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assertEquals(f1(), 42);
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assertEquals(f2(), 43);
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let f1_addr = Sandbox.getAddressOf(f1);
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let f2_addr = Sandbox.getAddressOf(f2);
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let dispatch_handle1 = memory.getUint32(f1_addr + kJSFunctionDispatchHandleOffset, true);
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let dispatch_handle2 = memory.getUint32(f2_addr + kJSFunctionDispatchHandleOffset, true);
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memory.setUint32(f2_addr + kJSFunctionDispatchHandleOffset, dispatch_handle1, true);
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memory.setUint32(f1_addr + kJSFunctionDispatchHandleOffset, dispatch_handle2, true);
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assertEquals(f1(), 43);
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assertEquals(f2(), 42);
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