1 /* 2 * Copyright (c) 2009, 2016, 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 jdk.vm.ci.code; 24 25 import static jdk.vm.ci.meta.MetaUtil.identityHashCodeString; 26 27 import jdk.vm.ci.meta.JavaKind; 28 29 /** 30 * Represents the target machine for a compiler, including the CPU architecture, the size of 31 * pointers and references, alignment of stacks, caches, etc. 32 */ 33 public class TargetDescription { 34 35 public final Architecture arch; 36 37 /** 38 * Specifies if this is a multi-processor system. 39 */ 40 public final boolean isMP; 41 42 /** 43 * Specifies if this target supports encoding objects inline in the machine code. 44 */ 45 public final boolean inlineObjects; 46 47 /** 48 * The machine word size on this target. 49 */ 50 public final int wordSize; 51 52 /** 53 * The {@link JavaKind} to be used for representing raw pointers and CPU registers in Java code. 54 */ 55 public final JavaKind wordJavaKind; 56 57 /** 58 * The stack alignment requirement of the platform. For example, from Appendix D of 59 * <a href="http://www.intel.com/Assets/PDF/manual/248966.pdf">Intel 64 and IA-32 Architectures 60 * Optimization Reference Manual</a>: 61 * 62 * <pre> 63 * "It is important to ensure that the stack frame is aligned to a 64 * 16-byte boundary upon function entry to keep local __m128 data, 65 * parameters, and XMM register spill locations aligned throughout 66 * a function invocation." 67 * </pre> 68 */ 69 public final int stackAlignment; 70 71 /** 72 * Maximum constant displacement at which a memory access can no longer be an implicit null 73 * check. 74 */ 75 public final int implicitNullCheckLimit; 76 77 public TargetDescription(Architecture arch, boolean isMP, int stackAlignment, int implicitNullCheckLimit, boolean inlineObjects) { 78 this.arch = arch; 79 this.isMP = isMP; 80 this.wordSize = arch.getWordSize(); 81 this.wordJavaKind = JavaKind.fromWordSize(wordSize); 82 this.stackAlignment = stackAlignment; 83 this.implicitNullCheckLimit = implicitNullCheckLimit; 84 this.inlineObjects = inlineObjects; 85 86 assert arch.getPlatformKind(wordJavaKind).equals(arch.getWordKind()); 87 } 88 89 @Override 90 public final int hashCode() { 91 throw new UnsupportedOperationException(); 92 } 93 94 @Override 95 public final boolean equals(Object obj) { 96 if (this == obj) { 97 return true; 98 } 99 if (obj instanceof TargetDescription) { 100 TargetDescription that = (TargetDescription) obj; 101 // @formatter:off 102 if (this.implicitNullCheckLimit == that.implicitNullCheckLimit && 103 this.inlineObjects == that.inlineObjects && 104 this.isMP == that.isMP && 105 this.stackAlignment == that.stackAlignment && 106 this.wordJavaKind.equals(that.wordJavaKind) && 107 this.wordSize == that.wordSize && 108 this.arch.equals(that.arch)) { 109 return true; 110 } 111 // @formatter:on 112 } 113 return false; 114 } 115 116 @Override 117 public String toString() { 118 return identityHashCodeString(this); 119 } 120 }