1 /* 2 * Copyright (c) 2009, 2015, 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.internal.jvmci.code; 24 25 import jdk.internal.jvmci.meta.*; 26 import static jdk.internal.jvmci.meta.MetaUtil.*; 27 28 /** 29 * Represents the target machine for a compiler, including the CPU architecture, the size of 30 * pointers and references, alignment of stacks, caches, etc. 31 */ 32 public class TargetDescription { 33 34 public final Architecture arch; 35 36 /** 37 * Specifies if this is a multi-processor system. 38 */ 39 public final boolean isMP; 40 41 /** 42 * Specifies if this target supports encoding objects inline in the machine code. 43 */ 44 public final boolean inlineObjects; 45 46 /** 47 * The machine word size on this target. 48 */ 49 public final int wordSize; 50 51 /** 52 * The kind to be used for representing raw pointers and CPU registers. 53 */ 54 public final JavaKind wordKind; 55 56 /** 57 * The stack alignment requirement of the platform. For example, from Appendix D of <a 58 * href="http://www.intel.com/Assets/PDF/manual/248966.pdf">Intel 64 and IA-32 Architectures 59 * Optimization Reference Manual</a>: 60 * 61 * <pre> 62 * "It is important to ensure that the stack frame is aligned to a 63 * 16-byte boundary upon function entry to keep local __m128 data, 64 * parameters, and XMM register spill locations aligned throughout 65 * a function invocation." 66 * </pre> 67 */ 68 public final int stackAlignment; 69 70 /** 71 * Maximum constant displacement at which a memory access can no longer be an implicit null 72 * check. 73 */ 74 public final int implicitNullCheckLimit; 75 76 public TargetDescription(Architecture arch, boolean isMP, int stackAlignment, int implicitNullCheckLimit, boolean inlineObjects) { 77 this.arch = arch; 78 this.isMP = isMP; 79 this.wordSize = arch.getWordSize(); 80 this.wordKind = JavaKind.fromWordSize(wordSize); 81 this.stackAlignment = stackAlignment; 82 this.implicitNullCheckLimit = implicitNullCheckLimit; 83 this.inlineObjects = inlineObjects; 84 } 85 86 @Override 87 public final int hashCode() { 88 throw new UnsupportedOperationException(); 89 } 90 91 @Override 92 public final boolean equals(Object obj) { 93 if (this == obj) { 94 return true; 95 } 96 if (obj instanceof TargetDescription) { 97 TargetDescription that = (TargetDescription) obj; 98 // @formatter:off 99 if (this.implicitNullCheckLimit == that.implicitNullCheckLimit && 100 this.inlineObjects == that.inlineObjects && 101 this.isMP == that.isMP && 102 this.stackAlignment == that.stackAlignment && 103 this.wordKind.equals(that.wordKind) && 104 this.wordSize == that.wordSize && 105 this.arch.equals(that.arch)) { 106 return true; 107 } 108 // @formatter:on 109 } 110 return false; 111 } 112 113 @Override 114 public String toString() { 115 return identityHashCodeString(this); 116 } 117 118 public int getSizeInBytes(PlatformKind kind) { 119 return kind.getSizeInBytes(); 120 } 121 122 public LIRKind getLIRKind(JavaKind javaKind) { 123 PlatformKind platformKind = arch.getPlatformKind(javaKind); 124 if (javaKind.isObject()) { 125 return LIRKind.reference(platformKind); 126 } else { 127 return LIRKind.value(platformKind); 128 } 129 } 130 }