1 /* 2 * Copyright (c) 2016, 2017, 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 24 25 26 package jdk.tools.jaotc.binformat; 27 28 import java.io.ByteArrayOutputStream; 29 import java.io.DataOutputStream; 30 import java.io.IOException; 31 32 public final class HeaderContainer { 33 34 private static final int CURRENT_VERSION = 1; 35 private final ReadOnlyDataContainer container; 36 37 // int _version; 38 // int _class_count; 39 // int _method_count; 40 // int _klasses_got_size; 41 // int _metadata_got_size; 42 // int _oop_got_size; 43 // int _jvm_version_offset; 44 45 public HeaderContainer(String jvmVersion, ReadOnlyDataContainer container) { 46 try { 47 byte[] filler = new byte[4 * 7]; 48 container.appendBytes(filler); 49 50 // Store JVM version string at the end of header section. 51 ByteArrayOutputStream bout = new ByteArrayOutputStream(); 52 DataOutputStream out = new DataOutputStream(bout); 53 out.writeUTF(jvmVersion); 54 out.writeShort(0); // Terminate by 0. 55 byte[] b = bout.toByteArray(); 56 container.appendBytes(b, 0, b.length); 57 } catch (IOException e) { 58 throw new InternalError("Failed to append bytes to header section", e); 59 } 60 61 this.container = container; 62 this.container.putIntAt(0 * 4, CURRENT_VERSION); 63 this.container.putIntAt(6 * 4, 7 * 4); // JVM version string offset 64 } 65 66 public String getContainerName() { 67 return container.getContainerName(); 68 } 69 70 public ReadOnlyDataContainer getContainer() { 71 return container; 72 } 73 74 public void setClassesCount(int count) { 75 this.container.putIntAt(1 * 4, count); 76 } 77 78 public void setMethodsCount(int count) { 79 this.container.putIntAt(2 * 4, count); 80 } 81 82 public void setKlassesGotSize(int size) { 83 this.container.putIntAt(3 * 4, size); 84 } 85 86 public void setMetadataGotSize(int size) { 87 this.container.putIntAt(4 * 4, size); 88 } 89 90 public void setOopGotSize(int size) { 91 this.container.putIntAt(5 * 4, size); 92 } 93 94 }