author | bobv |
Thu, 09 Feb 2017 15:43:54 -0500 | |
changeset 46260 | 5de61384fba6 |
parent 42650 | 1f304d0c888b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.tools.jaotc.binformat; |
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import jdk.tools.jaotc.binformat.Symbol.Binding; |
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import jdk.tools.jaotc.binformat.Symbol.Kind; |
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import jdk.tools.jaotc.binformat.Container; |
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import java.io.ByteArrayOutputStream; |
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import java.nio.ByteBuffer; |
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import java.nio.ByteOrder; |
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import java.util.Arrays; |
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/** |
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* Base class that represents content of all sections with byte-level granularity. The ByteContainer |
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* class is backed by a ByteArrayOutputStream. This class supports writing all desired byte content |
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* to the container using the method {@code appendBytes} and accessing the byte array using the |
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* method {@code getByteArray}. |
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* |
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* The method {@code putIntAt} updates the content of {@code contentBytes}. Changes are not |
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* reflected in {@code contentStream}. |
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*/ |
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public class ByteContainer implements Container { |
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/** |
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* {@code ByteBuffer} representation of {@code BinaryContainer}. |
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*/ |
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private ByteBuffer contentBytes; |
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/** |
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* {@code ByteArrayoutputStream} to which all appends are done. |
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*/ |
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private ByteArrayOutputStream contentStream; |
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/** |
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* Boolean to indicate if contentBytes was modified. |
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*/ |
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private boolean bufferModified; |
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/** |
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* Boolean to indicate if this section contains any relocations. |
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*/ |
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private boolean hasRelocations; |
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/** |
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* Name of this container, used as section name. |
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*/ |
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private String containerName; |
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private final SymbolTable symbolTable; |
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/** |
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* Contains a unique id. |
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*/ |
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private int sectionId = -1; |
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/** |
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* Construct a {@code ByteContainer} object. |
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*/ |
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public ByteContainer(String containerName, SymbolTable symbolTable) { |
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this.containerName = containerName; |
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this.symbolTable = symbolTable; |
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this.contentBytes = null; |
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this.bufferModified = false; |
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this.hasRelocations = false; |
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this.contentStream = new ByteArrayOutputStream(); |
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} |
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/** |
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* Update byte buffer to reflect the current contents of byte stream. |
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* |
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* @throws InternalError throws {@code InternalError} if buffer byte array was modified |
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*/ |
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private void updateByteBuffer() { |
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if (!bufferModified) { |
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contentBytes = ByteBuffer.wrap(contentStream.toByteArray()); |
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// Default byte order of ByteBuffer is BIG_ENDIAN. |
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// Set it appropriately |
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this.contentBytes.order(ByteOrder.nativeOrder()); |
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} else { |
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throw new InternalError("Backing byte buffer no longer in sync with byte stream"); |
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} |
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} |
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/** |
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* Get the byte array of {@code ByteContainer}. |
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* |
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* @return byte array |
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* @throws InternalError throws {@code InternalError} if buffer byte array was modified |
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*/ |
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public byte[] getByteArray() { |
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if (!bufferModified) { |
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updateByteBuffer(); |
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} |
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return contentBytes.array(); |
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} |
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/** |
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* Append to byte stream. It is an error to append to stream if the byte buffer version is |
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* changed. |
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* |
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* @param newBytes new content |
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* @param off offset start offset in {@code newBytes} |
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* @param len length of data to write |
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* @throws InternalError throws {@code InternalError} if buffer byte array was modified |
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*/ |
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public ByteContainer appendBytes(byte[] newBytes, int off, int len) { |
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if (bufferModified) { |
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throw new InternalError("Backing byte buffer no longer in sync with byte stream"); |
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} |
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contentStream.write(newBytes, off, len); |
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return this; |
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} |
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public ByteContainer appendBytes(byte[] newBytes) { |
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appendBytes(newBytes, 0, newBytes.length); |
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return this; |
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} |
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public ByteContainer appendInt(int i) { |
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if (bufferModified) { |
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throw new InternalError("Backing byte buffer no longer in sync with byte stream"); |
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} |
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ByteBuffer b = ByteBuffer.allocate(Integer.BYTES); |
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b.order(ByteOrder.nativeOrder()); |
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b.putInt(i); |
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byte[] result = b.array(); |
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contentStream.write(result, 0, result.length); |
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return this; |
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} |
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public ByteContainer appendInts(int[] newInts) { |
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if (bufferModified) { |
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throw new InternalError("Backing byte buffer no longer in sync with byte stream"); |
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} |
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ByteBuffer b = ByteBuffer.allocate(Integer.BYTES * newInts.length).order(ByteOrder.nativeOrder()); |
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Arrays.stream(newInts).forEach(i -> b.putInt(i)); |
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byte[] result = b.array(); |
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contentStream.write(result, 0, result.length); |
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return this; |
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} |
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public void appendLong(long l) { |
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if (bufferModified) { |
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throw new InternalError("Backing byte buffer no longer in sync with byte stream"); |
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} |
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ByteBuffer b = ByteBuffer.allocate(8); |
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b.order(ByteOrder.nativeOrder()); |
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b.putLong(l); |
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byte[] result = b.array(); |
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contentStream.write(result, 0, result.length); |
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} |
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/** |
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* Return the current size of byte stream backing the BinaryContainer. |
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* |
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* @return size of buffer stream |
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*/ |
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public int getByteStreamSize() { |
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return contentStream.size(); |
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} |
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/** |
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* Return the name of this container. |
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* |
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* @return string containing name |
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*/ |
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public String getContainerName() { |
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return containerName; |
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} |
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/** |
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* Modify the byte buffer version of the byte output stream. Note that after calling this method |
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* all further updates to BinaryContainer will be out of sync with byte buffer content. |
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* |
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* @param index index of byte to be changed |
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* @param value new value |
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*/ |
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public void putIntAt(int index, int value) { |
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if (!bufferModified) { |
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updateByteBuffer(); |
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} |
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contentBytes.putInt(index, value); |
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bufferModified = true; |
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} |
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public void putLongAt(int index, long value) { |
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if (!bufferModified) { |
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updateByteBuffer(); |
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} |
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contentBytes.putLong(index, value); |
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bufferModified = true; |
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} |
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public void setSectionId(int id) { |
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if (sectionId != -1) { |
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throw new InternalError("Assigning new sectionId (old: " + sectionId + ", new: " + id + ")"); |
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} |
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sectionId = id; |
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} |
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public int getSectionId() { |
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if (sectionId == -1) { |
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throw new InternalError("Using sectionId before assigned"); |
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} |
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return sectionId; |
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} |
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public Symbol createSymbol(int offset, Kind kind, Binding binding, int size, String name) { |
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Symbol symbol = new Symbol(offset, kind, binding, this, size, name); |
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symbolTable.addSymbol(symbol); |
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return symbol; |
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} |
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public GotSymbol createGotSymbol(String name) { |
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GotSymbol symbol = new GotSymbol(Kind.OBJECT, Binding.LOCAL, this, name); |
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symbolTable.addSymbol(symbol); |
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return symbol; |
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} |
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public GotSymbol createGotSymbol(int offset, String name) { |
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GotSymbol symbol = new GotSymbol(offset, Kind.OBJECT, Binding.LOCAL, this, name); |
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symbolTable.addSymbol(symbol); |
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return symbol; |
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} |
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public void clear() { |
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this.contentBytes = null; |
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this.contentStream = null; |
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} |
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public void setHasRelocations() { |
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this.hasRelocations = true; |
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} |
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public boolean hasRelocations() { |
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return this.hasRelocations; |
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} |
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} |