Mercurial > hg > truffle
diff graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterSaveLayout.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> |
---|---|
date | Wed, 27 May 2015 00:36:16 +0200 |
parents | graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterSaveLayout.java@d60dd21329f2 |
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/RegisterSaveLayout.java Wed May 27 00:36:16 2015 +0200 @@ -0,0 +1,127 @@ +/* + * 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 com.oracle.jvmci.code; + +import java.util.*; + +/** + * 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} + */ + 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(); + } +}