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comparison graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/MemoryAccessProvider.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/MemoryAccessProvider.java@2906b3cc3e2f
children
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21555:d12eaef9af72 21556:48c1ebd24120
1 /*
2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.jvmci.meta;
24
25 /**
26 * Provides memory access operations for the target VM.
27 */
28 public interface MemoryAccessProvider {
29
30 /**
31 * Reads a value of this kind using a base address and a displacement. No bounds checking or
32 * type checking is performed. Returns {@code null} if the value is not available at this point.
33 *
34 * @param base the base address from which the value is read.
35 * @param displacement the displacement within the object in bytes
36 * @return the read value encapsulated in a {@link JavaConstant} object, or {@code null} if the
37 * value cannot be read.
38 */
39 JavaConstant readUnsafeConstant(Kind kind, JavaConstant base, long displacement);
40
41 /**
42 * Reads a primitive value using a base address and a displacement.
43 *
44 * @param kind the {@link Kind} of the returned {@link JavaConstant} object
45 * @param base the base address from which the value is read
46 * @param displacement the displacement within the object in bytes
47 * @param bits the number of bits to read from memory
48 * @return the read value encapsulated in a {@link JavaConstant} object of {@link Kind} kind
49 */
50 JavaConstant readPrimitiveConstant(Kind kind, Constant base, long displacement, int bits);
51
52 /**
53 * Reads a Java {@link Object} value using a base address and a displacement.
54 *
55 * @param base the base address from which the value is read
56 * @param displacement the displacement within the object in bytes
57 * @return the read value encapsulated in a {@link Constant} object
58 */
59 JavaConstant readObjectConstant(Constant base, long displacement);
60 }