Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/MemoryAccessProvider.java @ 24113:8cf4cf3f9f2a
missing checks in HotSpotMemoryAccessProviderImpl can cause VM assertions to fail - part 3 (JDK-8177673)
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Sat, 01 Apr 2017 00:28:33 +0200 |
parents | 8abcd8e1285d |
children |
line wrap: on
line source
/* * Copyright (c) 2012, 2015, 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.meta; /** * Provides memory access operations for the target VM. */ public interface MemoryAccessProvider { /** * Reads a primitive value using a base address and a displacement. * * @param kind the {@link JavaKind} of the returned {@link JavaConstant} object * @param base the base address from which the value is read * @param displacement the displacement within the object in bytes * @param bits the number of bits to read from memory * @return the read value encapsulated in a {@link JavaConstant} object of {@link JavaKind} kind * @throws IllegalArgumentException if the read is out of bounds of the object or {@code kind} * is {@link JavaKind#Void} or not {@linkplain JavaKind#isPrimitive() primitive} * kind or {@code bits} is not 8, 16, 32 or 64 */ JavaConstant readPrimitiveConstant(JavaKind kind, Constant base, long displacement, int bits) throws IllegalArgumentException; /** * Reads a Java {@link Object} value using a base address and a displacement. * * @param base the base address from which the value is read * @param displacement the displacement within the object in bytes * @return the read value encapsulated in a {@link Constant} object * @throws IllegalArgumentException if the address computed from {@code base} and * {@code displacement} does not denote a location holding an {@code Object} value */ JavaConstant readObjectConstant(Constant base, long displacement); }