/* * Copyright (c) 2009, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.vm.ci.code; import static jdk.vm.ci.meta.MetaUtil.identityHashCodeString; import jdk.vm.ci.meta.JavaKind; /** * Represents the target machine for a compiler, including the CPU architecture, the size of * pointers and references, alignment of stacks, caches, etc. */ public class TargetDescription { public final Architecture arch; /** * Specifies if this is a multi-processor system. */ public final boolean isMP; /** * Specifies if this target supports encoding objects inline in the machine code. */ public final boolean inlineObjects; /** * The machine word size on this target. */ public final int wordSize; /** * The {@link JavaKind} to be used for representing raw pointers and CPU registers in Java code. */ public final JavaKind wordJavaKind; /** * The stack alignment requirement of the platform. For example, from Appendix D of * <a href="http://www.intel.com/Assets/PDF/manual/248966.pdf">Intel 64 and IA-32 Architectures * Optimization Reference Manual</a>: * * <pre> * "It is important to ensure that the stack frame is aligned to a * 16-byte boundary upon function entry to keep local __m128 data, * parameters, and XMM register spill locations aligned throughout * a function invocation." * </pre> */ public final int stackAlignment; /** * Maximum constant displacement at which a memory access can no longer be an implicit null * check. */ public final int implicitNullCheckLimit; public TargetDescription(Architecture arch, boolean isMP, int stackAlignment, int implicitNullCheckLimit, boolean inlineObjects) { this.arch = arch; this.isMP = isMP; this.wordSize = arch.getWordSize(); this.wordJavaKind = JavaKind.fromWordSize(wordSize); this.stackAlignment = stackAlignment; this.implicitNullCheckLimit = implicitNullCheckLimit; this.inlineObjects = inlineObjects; assert arch.getPlatformKind(wordJavaKind).equals(arch.getWordKind()); } @Override public final int hashCode() { throw new UnsupportedOperationException(); } @Override public final boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof TargetDescription) { TargetDescription that = (TargetDescription) obj; // @formatter:off if (this.implicitNullCheckLimit == that.implicitNullCheckLimit && this.inlineObjects == that.inlineObjects && this.isMP == that.isMP && this.stackAlignment == that.stackAlignment && this.wordJavaKind.equals(that.wordJavaKind) && this.wordSize == that.wordSize && this.arch.equals(that.arch)) { return true; } // @formatter:on } return false; } @Override public String toString() { return identityHashCodeString(this); } }