Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/RegisterAttributes.java @ 23398:3e8ce13f4e12
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author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 17 May 2016 21:10:34 +0200 |
parents | 1bbd4a7c274b |
children | 9e1235406b59 |
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/* * Copyright (c) 2010, 2011, 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 java.util.Arrays; /** * A collection of register attributes. The specific attribute values for a register may be local to * a compilation context. For example, a {@link RegisterConfig} in use during a compilation will * determine which registers are callee saved. */ public class RegisterAttributes { private final boolean callerSave; private final boolean calleeSave; private final boolean allocatable; public RegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) { this.callerSave = isCallerSave; this.calleeSave = isCalleeSave; this.allocatable = isAllocatable; } public static final RegisterAttributes NONE = new RegisterAttributes(false, false, false); /** * Creates a map from register {@linkplain Register#number numbers} to register * {@linkplain RegisterAttributes attributes} for a given register configuration and set of * registers. * * @param registerConfig a register configuration * @param registers a set of registers * @return an array whose length is the max register number in {@code registers} plus 1. An * element at index i holds the attributes of the register whose number is i. */ public static RegisterAttributes[] createMap(RegisterConfig registerConfig, Register[] registers) { RegisterAttributes[] map = new RegisterAttributes[registers.length]; for (Register reg : registers) { if (reg != null) { Register[] csr = registerConfig.getCalleeSaveRegisters(); RegisterAttributes attr = new RegisterAttributes(Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg), csr == null ? false : Arrays.asList(csr).contains(reg), Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg)); if (map.length <= reg.number) { map = Arrays.copyOf(map, reg.number + 1); } map[reg.number] = attr; } } for (int i = 0; i < map.length; i++) { if (map[i] == null) { map[i] = NONE; } } return map; } /** * @return Denotes a register that is available for use by a register allocator. */ public boolean isAllocatable() { return allocatable; } /** * @return Denotes a register whose value preservation (if required) across a call is the * responsibility of the callee. */ public boolean isCalleeSave() { return calleeSave; } /** * @return Denotes a register whose value preservation (if required) across a call is the * responsibility of the caller. */ public boolean isCallerSave() { return callerSave; } }