JohnTortugo

Compiled method (c2)     504   48             TestObjectClone::test (37 bytes)
 total in heap  [0x00007f4ba915d110,0x00007f4ba915d568] = 1112
 relocation     [0x00007f4ba915d280,0x00007f4ba915d2a8] = 40
 main code      [0x00007f4ba915d2c0,0x00007f4ba915d3d0] = 272
 stub code      [0x00007f4ba915d3d0,0x00007f4ba915d3e8] = 24
 oops           [0x00007f4ba915d3e8,0x00007f4ba915d3f8] = 16
 metadata       [0x00007f4ba915d3f8,0x00007f4ba915d410] = 24
 scopes data    [0x00007f4ba915d410,0x00007f4ba915d4b0] = 160
 scopes pcs     [0x00007f4ba915d4b0,0x00007f4ba915d560] = 176
 dependencies   [0x00007f4ba915d560,0x00007f4ba915d568] = 8

JohnTortugo

HotSpot Escape Analysis and Scalar Replacement Status

Introduction

Escape Analysis (EA) is a compiler analysis to answer the following questions for a given object O, method M, and thread T.

• Escapes(O, M): Does object O outlive the execution of method M? This may happen for instance if a reference to O is assigned to a global variable.
• Escapes(O, T): Does object O escape the current execution thread? This may happen for instance if a reference to O is copied to another thread.

Answers to these questions enable a compiler to perform a few highly effective optimizations, for instance, Stack Allocation (SA), Lock Elision (LE), and Scalar Replacement of Aggregates (SRA). Note that,

JohnTortugo

/*
 * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or