| /* |
| * Copyright (c) 2013, 2014, 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.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| /** |
| * A map from registers to frame slots. This can be used to describe where callee saved registers |
| * are saved in a callee's frame. |
| */ |
| public final class RegisterSaveLayout { |
| |
| /** |
| * Keys. |
| */ |
| private final Register[] registers; |
| |
| /** |
| * Slot indexes relative to stack pointer. |
| */ |
| private final int[] slots; |
| |
| /** |
| * Creates a map from registers to frame slots. |
| * |
| * @param registers the keys in the map |
| * @param slots frame slot index for each register in {@code registers} |
| */ |
| @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `registers` and `slots`") |
| public RegisterSaveLayout(Register[] registers, int[] slots) { |
| assert registers.length == slots.length; |
| this.registers = registers; |
| this.slots = slots; |
| assert registersToSlots(false).size() == registers.length : "non-unique registers"; |
| assert new HashSet<>(registersToSlots(false).values()).size() == slots.length : "non-unqiue slots"; |
| } |
| |
| /** |
| * Gets the frame slot index for a given register. |
| * |
| * @param register register to get the frame slot index for |
| * @return frame slot index |
| */ |
| public int registerToSlot(Register register) { |
| for (int i = 0; i < registers.length; i++) { |
| if (register.equals(registers[i])) { |
| return slots[i]; |
| } |
| } |
| throw new IllegalArgumentException(register + " not saved by this layout: " + this); |
| } |
| |
| /** |
| * Gets this layout information as a {@link Map} from registers to slots. |
| */ |
| public Map<Register, Integer> registersToSlots(boolean sorted) { |
| Map<Register, Integer> result; |
| if (sorted) { |
| result = new TreeMap<>(); |
| } else { |
| result = new HashMap<>(); |
| } |
| for (int i = 0; i < registers.length; i++) { |
| result.put(registers[i], slots[i]); |
| } |
| return result; |
| } |
| |
| /** |
| * Gets this layout information as a {@link Map} from slots to registers. |
| */ |
| public Map<Integer, Register> slotsToRegisters(boolean sorted) { |
| Map<Integer, Register> result; |
| if (sorted) { |
| result = new TreeMap<>(); |
| } else { |
| result = new HashMap<>(); |
| } |
| for (int i = 0; i < registers.length; i++) { |
| result.put(slots[i], registers[i]); |
| } |
| return result; |
| } |
| |
| @Override |
| public int hashCode() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof RegisterSaveLayout) { |
| RegisterSaveLayout that = (RegisterSaveLayout) obj; |
| if (Arrays.equals(registers, that.registers) && Arrays.equals(slots, that.slots)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public String toString() { |
| return registersToSlots(true).toString(); |
| } |
| } |