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annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/MemoryAccessProvider.java @ 21562:47bebae7454f

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Merge.
author Doug Simon <doug.simon@oracle.com>
date Thu, 28 May 2015 21:58:33 +0200
parents 48c1ebd24120
children
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0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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1 /*
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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7 * published by the Free Software Foundation.
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8 *
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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12 * version 2 for more details (a copy is included in the LICENSE file that
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.jvmci.meta;
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24
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25 /**
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26 * Provides memory access operations for the target VM.
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27 */
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28 public interface MemoryAccessProvider {
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29
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30 /**
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31 * Reads a value of this kind using a base address and a displacement. No bounds checking or
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32 * type checking is performed. Returns {@code null} if the value is not available at this point.
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33 *
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34 * @param base the base address from which the value is read.
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35 * @param displacement the displacement within the object in bytes
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36 * @return the read value encapsulated in a {@link JavaConstant} object, or {@code null} if the
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37 * value cannot be read.
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38 */
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39 JavaConstant readUnsafeConstant(Kind kind, JavaConstant base, long displacement);
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41 /**
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42 * Reads a primitive value using a base address and a displacement.
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43 *
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44 * @param kind the {@link Kind} of the returned {@link JavaConstant} object
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45 * @param base the base address from which the value is read
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46 * @param displacement the displacement within the object in bytes
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47 * @param bits the number of bits to read from memory
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48 * @return the read value encapsulated in a {@link JavaConstant} object of {@link Kind} kind
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49 */
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50 JavaConstant readPrimitiveConstant(Kind kind, Constant base, long displacement, int bits);
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51
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52 /**
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53 * Reads a Java {@link Object} value using a base address and a displacement.
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54 *
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55 * @param base the base address from which the value is read
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56 * @param displacement the displacement within the object in bytes
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57 * @return the read value encapsulated in a {@link Constant} object
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58 */
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59 JavaConstant readObjectConstant(Constant base, long displacement);
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60 }