--- /dev/null 2017-01-22 10:16:57.869617664 -0800 +++ new/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/VMField.java 2017-02-15 16:56:02.332887597 -0800 @@ -0,0 +1,92 @@ +/* + * Copyright (c) 2016, 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 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package jdk.vm.ci.hotspot; + +/** + * Describes a C++ field exposed via {@link HotSpotVMConfigAccess}. + */ +public final class VMField { + + /** + * Fully qualified name of the represented field (e.g., "Klass::_name"). + */ + public final String name; + + /** + * The represented field's type (e.g., "Symbol*"). This may be {@code null}. + */ + public final String type; + + /** + * If the represented field is non-static, this is its offset within the containing structure. + */ + public final long offset; + + /** + * If the represented field is static, this is its address. Otherwise, this is 0. + */ + public final long address; + + /** + * Value of the field represented as a boxed boolean if its C++ type is bool otherwise as a + * boxed long; only valid for non-oop static fields. This value is only captured once, during + * JVMCI initialization. If {@link #type} cannot be meaningfully (e.g., a struct) or safely + * (e.g., an oop) expressed as a boxed object, this is {@code null}. + */ + public final Object value; + + /** + * Determines if the represented field is static. + */ + public boolean isStatic() { + return address != 0; + } + + /** + * Creates a description of a non-static field. + */ + public VMField(String name, String type, long offset) { + this.name = name; + this.type = type; + this.offset = offset; + this.address = 0; + this.value = null; + } + + /** + * Creates a description of a static field. + */ + public VMField(String name, String type, long address, Long value) { + this.name = name; + this.type = type; + this.offset = 0; + this.address = address; + this.value = value; + } + + @Override + public String toString() { + String val = value == null ? "null" : String.format("0x%x", value); + return String.format("Field[name=%s, type=%s, offset=%d, address=0x%x, value=%s]", name, type, offset, address, val); + } +}