Mercurial > hg > truffle
diff graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/Register.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/Register.java@edb88f5425e6 |
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/Register.java Wed May 27 00:36:16 2015 +0200 @@ -0,0 +1,241 @@ +/* + * Copyright (c) 2009, 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 com.oracle.jvmci.meta.*; + +/** + * Represents a target machine register. + */ +public final class Register implements Comparable<Register> { + + public static final RegisterCategory SPECIAL = new RegisterCategory("SPECIAL"); + + /** + * Invalid register. + */ + public static final Register None = new Register(-1, -1, "noreg", SPECIAL); + + /** + * Frame pointer of the current method. All spill slots and outgoing stack-based arguments are + * addressed relative to this register. + */ + public static final Register Frame = new Register(-2, -2, "framereg", SPECIAL); + + public static final Register CallerFrame = new Register(-3, -3, "callerframereg", SPECIAL); + + /** + * The identifier for this register that is unique across all the registers in a + * {@link Architecture}. 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 assembler calls this method to get the register's encoding. + */ + public int encoding() { + return encoding; + } + + /** + * A platform specific register category that describes which values can be stored in a + * register. + */ + private final RegisterCategory registerCategory; + + /** + * A platform specific register type that describes which values can be stored in a register. + */ + public static class RegisterCategory { + + private final String name; + + private final int referenceMapOffset; + private final int referenceMapShift; + + public RegisterCategory(String name) { + this(name, 0, 0); + } + + public RegisterCategory(String name, int referenceMapOffset) { + this(name, referenceMapOffset, 0); + } + + public RegisterCategory(String name, int referenceMapOffset, int referenceMapShift) { + this.name = name; + this.referenceMapOffset = referenceMapOffset; + this.referenceMapShift = referenceMapShift; + } + + @Override + public String toString() { + return name; + } + + @Override + public int hashCode() { + return 23 + name.hashCode(); + } + + @Override + public boolean equals(Object obj) { + if (obj instanceof RegisterCategory) { + RegisterCategory that = (RegisterCategory) obj; + return this.referenceMapOffset == that.referenceMapOffset && this.referenceMapShift == that.referenceMapShift && this.name.equals(that.name); + } + return false; + } + } + + /** + * Creates a {@link Register} instance. + * + * @param number unique identifier for the register + * @param encoding the target machine encoding for the register + * @param name the mnemonic name for the register + * @param registerCategory the register category + */ + public Register(int number, int encoding, String name, RegisterCategory registerCategory) { + this.number = number; + this.name = name; + this.registerCategory = registerCategory; + this.encoding = encoding; + } + + public RegisterCategory getRegisterCategory() { + return registerCategory; + } + + /** + * Get the start index of this register in the {@link ReferenceMap}. + */ + public int getReferenceMapIndex() { + return (encoding << registerCategory.referenceMapShift) + registerCategory.referenceMapOffset; + } + + /** + * Gets this register as a {@linkplain RegisterValue value} with a specified kind. + * + * @param kind the specified kind + * @return the {@link RegisterValue} + */ + public RegisterValue asValue(LIRKind kind) { + return new RegisterValue(kind, this); + } + + /** + * Gets this register as a {@linkplain RegisterValue value} with no particular kind. + * + * @return a {@link RegisterValue} with {@link Kind#Illegal} kind. + */ + public RegisterValue asValue() { + return asValue(LIRKind.Illegal); + } + + /** + * Determines if this is a valid register. + * + * @return {@code true} iff this register is valid + */ + public boolean isValid() { + return number >= 0; + } + + /** + * 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(Register[] registers) { + int max = Integer.MIN_VALUE; + for (Register 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(Register[] registers) { + int max = Integer.MIN_VALUE; + for (Register r : registers) { + if (r.encoding > max) { + max = r.encoding; + } + } + return max; + } + + @Override + public String toString() { + return name; + } + + @Override + public int compareTo(Register o) { + if (number < o.number) { + return -1; + } + if (number > o.number) { + return 1; + } + return 0; + } + + @Override + public int hashCode() { + return 17 + name.hashCode(); + } + + @Override + public boolean equals(Object obj) { + if (obj instanceof Register) { + Register other = (Register) obj; + if (number == other.number) { + assert name.equals(other.name); + assert encoding == other.encoding; + assert registerCategory.equals(other.registerCategory); + return true; + } + } + return false; + } +}