| /* |
| * 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); |
| } |
