--- /dev/null 2017-01-22 10:16:57.869617664 -0800 +++ new/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.code/src/jdk/vm/ci/code/TargetDescription.java 2017-02-15 16:55:32.755586761 -0800 @@ -0,0 +1,120 @@ +/* + * 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 + * Intel 64 and IA-32 Architectures + * Optimization Reference Manual: + * + *
+     *     "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."
+     * 
+ */ + 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); + } +}