Mercurial > hg > graal-compiler
view graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiRegister.java @ 4207:e2578f3e8ab2
Allow an arbitary number of output operands for LIR instructions
author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Tue, 03 Jan 2012 13:47:14 -0800 |
parents | aaac4894175c |
children | 12c63380e7ff |
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/* * Copyright (c) 2009, 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.max.cri.ci; import java.io.*; import java.util.*; /** * Represents a target machine register. */ public final class CiRegister implements Comparable<CiRegister>, Serializable { /** * */ private static final long serialVersionUID = -7213269157816016300L; /** * Invalid register. */ public static final CiRegister None = new CiRegister(-1, -1, 0, "noreg"); /** * Frame pointer of the current method. All spill slots and outgoing stack-based arguments * are addressed relative to this register. */ public static final CiRegister Frame = new CiRegister(-2, -2, 0, "framereg", RegisterFlag.CPU); public static final CiRegister CallerFrame = new CiRegister(-3, -3, 0, "callerframereg", RegisterFlag.CPU); /** * The identifier for this register that is unique across all the registers in a {@link CiArchitecture}. * A valid register has {@code number > 0}. */ public final int number; /** * The mnemonic of this register. */ public final String name; /** * The actual encoding in a target machine instruction for this register, which may or * may not be the same as {@link #number}. */ public final int encoding; /** * The size of the stack slot used to spill the value of this register. */ public final int spillSlotSize; /** * The set of {@link RegisterFlag} values associated with this register. */ private final int flags; /** * An array of {@link CiRegisterValue} objects, for this register, with one entry * per {@link CiKind}, indexed by {@link CiKind#ordinal}. */ private final CiRegisterValue[] values; /** * Attributes that characterize a register in a useful way. * */ public enum RegisterFlag { /** * Denotes an integral (i.e. non floating point) register. */ CPU, /** * Denotes a register whose lowest order byte can be addressed separately. */ Byte, /** * Denotes a floating point register. */ FPU; public final int mask = 1 << (ordinal() + 1); } /** * Creates a {@code CiRegister} instance. * * @param number unique identifier for the register * @param encoding the target machine encoding for the register * @param spillSlotSize the size of the stack slot used to spill the value of the register * @param name the mnemonic name for the register * @param flags the set of {@link RegisterFlag} values for the register */ public CiRegister(int number, int encoding, int spillSlotSize, String name, RegisterFlag... flags) { this.number = number; this.name = name; this.spillSlotSize = spillSlotSize; this.flags = createMask(flags); this.encoding = encoding; values = new CiRegisterValue[CiKind.VALUES.length]; for (CiKind kind : CiKind.VALUES) { values[kind.ordinal()] = new CiRegisterValue(kind, this); } } private static int createMask(RegisterFlag... flags) { int result = 0; for (RegisterFlag f : flags) { result |= f.mask; } return result; } public boolean isSet(RegisterFlag f) { return (flags & f.mask) != 0; } /** * Gets this register as a {@linkplain CiRegisterValue value} with a specified kind. * @param kind the specified kind * @return the {@link CiRegisterValue} */ public CiRegisterValue asValue(CiKind kind) { return values[kind.ordinal()]; } /** * Gets this register as a {@linkplain CiRegisterValue value} with no particular kind. * @return a {@link CiRegisterValue} with {@link CiKind#Illegal} kind. */ public CiRegisterValue asValue() { return asValue(CiKind.Illegal); } /** * Determines if this is a valid register. * @return {@code true} iff this register is valid */ public boolean isValid() { return number >= 0; } /** * Determines if this a floating point register. */ public boolean isFpu() { return isSet(RegisterFlag.FPU); } /** * Determines if this a general purpose register. */ public boolean isCpu() { return isSet(RegisterFlag.CPU); } /** * Determines if this register has the {@link RegisterFlag#Byte} attribute set. * @return {@code true} iff this register has the {@link RegisterFlag#Byte} attribute set. */ public boolean isByte() { return isSet(RegisterFlag.Byte); } /** * Categorizes a set of registers by {@link RegisterFlag}. * * @param registers a list of registers to be categorized * @return a map from each {@link RegisterFlag} constant to the list of registers for which the flag is * {@linkplain #isSet(RegisterFlag) set} */ public static EnumMap<RegisterFlag, CiRegister[]> categorize(CiRegister[] registers) { EnumMap<RegisterFlag, CiRegister[]> result = new EnumMap<>(RegisterFlag.class); for (RegisterFlag flag : RegisterFlag.values()) { ArrayList<CiRegister> list = new ArrayList<>(); for (CiRegister r : registers) { if (r.isSet(flag)) { list.add(r); } } result.put(flag, list.toArray(new CiRegister[list.size()])); } return result; } /** * Gets the maximum register {@linkplain #number number} in a given set of registers. * * @param registers the set of registers to process * @return the maximum register number for any register in {@code registers} */ public static int maxRegisterNumber(CiRegister[] registers) { int max = Integer.MIN_VALUE; for (CiRegister r : registers) { if (r.number > max) { max = r.number; } } return max; } /** * Gets the maximum register {@linkplain #encoding encoding} in a given set of registers. * * @param registers the set of registers to process * @return the maximum register encoding for any register in {@code registers} */ public static int maxRegisterEncoding(CiRegister[] registers) { int max = Integer.MIN_VALUE; for (CiRegister r : registers) { if (r.encoding > max) { max = r.encoding; } } return max; } @Override public String toString() { return name; } @Override public int compareTo(CiRegister o) { if (number < o.number) { return -1; } if (number > o.number) { return 1; } return 0; } }