| /* |
| * 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; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * 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, RegisterArray registers) { |
| RegisterAttributes[] map = new RegisterAttributes[registers.size()]; |
| List<Register> callerSaveRegisters = registerConfig.getCallerSaveRegisters().asList(); |
| List<Register> calleeSaveRegisters = registerConfig.getCalleeSaveRegisters() == null ? Collections.emptyList() : registerConfig.getCalleeSaveRegisters().asList(); |
| List<Register> allocatableRegisters = registerConfig.getAllocatableRegisters().asList(); |
| for (Register reg : registers) { |
| if (reg != null) { |
| RegisterAttributes attr = new RegisterAttributes(callerSaveRegisters.contains(reg), calleeSaveRegisters.contains(reg), allocatableRegisters.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 {@code true} if a register is available for use by a register allocator otherwise |
| * {@code false} |
| */ |
| public boolean isAllocatable() { |
| return allocatable; |
| } |
| |
| /** |
| * @return {@code true} if a register whose value preservation (if required) across a call is |
| * the responsibility of the callee otherwise {@code false} |
| */ |
| public boolean isCalleeSave() { |
| return calleeSave; |
| } |
| |
| /** |
| * @return {@code true} if a register whose value preservation (if required) across a call is |
| * the responsibility of the caller otherwise {@code false} |
| */ |
| public boolean isCallerSave() { |
| return callerSave; |
| } |
| } |