Mercurial > hg > graal-compiler
diff graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiRegister.java @ 4199:aaac4894175c
Renamed cri packages from sun to oracle.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 03 Jan 2012 16:29:28 +0100 |
parents | graal/com.oracle.max.cri/src/com/sun/cri/ci/CiRegister.java@bc8527f3071c |
children | 12c63380e7ff |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiRegister.java Tue Jan 03 16:29:28 2012 +0100 @@ -0,0 +1,257 @@ +/* + * 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; + } + +}