Mercurial > hg > truffle
diff graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterAttributes.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 00:36:16 +0200 |
parents | graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterAttributes.java@1cde96b96673 |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterAttributes.java Wed May 27 00:36:16 2015 +0200 @@ -0,0 +1,99 @@ +/* + * 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 com.oracle.jvmci.code; + +import java.util.*; + +/** + * 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) { + CalleeSaveLayout csl = registerConfig.getCalleeSaveLayout(); + RegisterAttributes attr = new RegisterAttributes(Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg), + csl == null ? false : Arrays.asList(csl.registers).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; + } +}