Mercurial > hg > graal-jvmci-8
diff graal/Compiler/src/com/sun/c1x/alloc/OperandPool.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/Compiler/src/com/sun/c1x/alloc/OperandPool.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,268 @@ +/* + * Copyright (c) 2010, 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.sun.c1x.alloc; + +import java.util.*; + +import com.sun.c1x.*; +import com.sun.c1x.ir.*; +import com.sun.cri.ci.*; + +/** + * An ordered, 0-based indexable pool of instruction operands for a method being compiled. + * The physical {@linkplain CiRegister registers} of the platform occupy the front of the + * pool (starting at index 0) followed by {@linkplain CiVariable variable} operands. + * The index of an operand in the pool is its {@linkplain #operandNumber(CiValue) operand number}. + * + * In the original HotSpot C1 source code, this pool corresponds to the + * "flat register file" mentioned in c1_LinearScan.cpp. + * + * @author Doug Simon + */ +public final class OperandPool { + + public static final int INITIAL_VARIABLE_CAPACITY = 20; + + /** + * The physical registers occupying the head of the operand pool. This is the complete + * {@linkplain CiArchitecture#registers register set} of the target architecture, not + * just the allocatable registers. + */ + private final CiRegister[] registers; + + /** + * The variable operands allocated from this pool. The {@linkplain #operandNumber(CiValue) number} + * of the first variable operand in this pool is one greater than the number of the last + * register operand in the pool. + */ + private final ArrayList<CiVariable> variables; + + /** + * Map from a {@linkplain CiVariable#index variable index} to the instruction whose result is stored in the denoted variable. + * This map is only populated and used if {@link C1XOptions#DetailedAsserts} is {@code true}. + */ + private final ArrayList<Value> variableDefs; + + /** + * The {@linkplain #operandNumber(CiValue) number} of the first variable operand + * {@linkplain #newVariable(CiKind) allocated} from this pool. + */ + private final int firstVariableNumber; + + /** + * Records which variable operands have the {@link VariableFlag#MustBeByteRegister} flag set. + */ + private CiBitMap mustBeByteRegister; + + /** + * Records which variable operands have the {@link VariableFlag#MustStartInMemory} flag set. + */ + private CiBitMap mustStartInMemory; + + /** + * Records which variable operands have the {@link VariableFlag#MustStayInMemory} flag set. + */ + private CiBitMap mustStayInMemory; + + /** + * Flags that can be set for {@linkplain CiValue#isVariable() variable} operands. + */ + public enum VariableFlag { + /** + * Denotes a variable that needs to be assigned a memory location + * at the beginning, but may then be loaded in a register. + */ + MustStartInMemory, + + /** + * Denotes a variable that needs to be assigned a memory location + * at the beginning and never subsequently loaded in a register. + */ + MustStayInMemory, + + /** + * Denotes a variable that must be assigned to a byte-sized register. + */ + MustBeByteRegister; + + public static final VariableFlag[] VALUES = values(); + } + + private static CiBitMap set(CiBitMap map, CiVariable variable) { + if (map == null) { + int length = CiBitMap.roundUpLength(variable.index + 1); + map = new CiBitMap(length); + } else if (map.size() <= variable.index) { + int length = CiBitMap.roundUpLength(variable.index + 1); + map.grow(length); + } + map.set(variable.index); + return map; + } + + private static boolean get(CiBitMap map, CiVariable variable) { + if (map == null || map.size() <= variable.index) { + return false; + } + return map.get(variable.index); + } + + /** + * Creates a new operand pool. + * + * @param target description of the target architecture for a compilation + */ + public OperandPool(CiTarget target) { + CiRegister[] registers = target.arch.registers; + this.firstVariableNumber = registers.length; + this.registers = registers; + variables = new ArrayList<CiVariable>(INITIAL_VARIABLE_CAPACITY); + variableDefs = C1XOptions.DetailedAsserts ? new ArrayList<Value>(INITIAL_VARIABLE_CAPACITY) : null; + } + + /** + * Creates a new {@linkplain CiVariable variable} operand. + * + * @param kind the kind of the variable + * @return a new variable + */ + public CiVariable newVariable(CiKind kind) { + return newVariable(kind, kind == CiKind.Boolean || kind == CiKind.Byte ? VariableFlag.MustBeByteRegister : null); + } + + /** + * Creates a new {@linkplain CiVariable variable} operand. + * + * @param kind the kind of the variable + * @param flag a flag that is set for the new variable operand (ignored if {@code null}) + * @return a new variable operand + */ + public CiVariable newVariable(CiKind kind, VariableFlag flag) { + assert kind != CiKind.Void; + int varIndex = variables.size(); + CiVariable var = CiVariable.get(kind, varIndex); + if (flag == VariableFlag.MustBeByteRegister) { + mustBeByteRegister = set(mustBeByteRegister, var); + } else if (flag == VariableFlag.MustStartInMemory) { + mustStartInMemory = set(mustStartInMemory, var); + } else if (flag == VariableFlag.MustStayInMemory) { + mustStayInMemory = set(mustStayInMemory, var); + } else { + assert flag == null; + } + variables.add(var); + return var; + } + + /** + * Gets the unique number for an operand contained in this pool. + * + * + * @param operand an operand + * @return the unique number for {@code operand} in the range {@code [0 .. size())} + */ + public int operandNumber(CiValue operand) { + if (operand.isRegister()) { + int number = operand.asRegister().number; + assert number < firstVariableNumber; + return number; + } + assert operand.isVariable(); + return firstVariableNumber + ((CiVariable) operand).index; + } + + /** + * Gets the operand in this pool denoted by a given operand number. + * + * @param operandNumber a value that must be in the range {@code [0 .. size())} + * @return the operand in this pool denoted by {@code operandNumber} + */ + public CiValue operandFor(int operandNumber) { + if (operandNumber < firstVariableNumber) { + assert operandNumber >= 0; + return registers[operandNumber].asValue(); + } + int index = operandNumber - firstVariableNumber; + CiVariable variable = variables.get(index); + assert variable.index == index; + return variable; + } + + /** + * Records that the result of {@code instruction} is stored in {@code result}. + * + * @param result the variable storing the result of {@code instruction} + * @param instruction an instruction that produces a result (i.e. pushes a value to the stack) + */ + public void recordResult(CiVariable result, Value instruction) { + while (variableDefs.size() <= result.index) { + variableDefs.add(null); + } + variableDefs.set(result.index, instruction); + } + + /** + * Gets the instruction whose result is recorded in a given variable. + * + * @param result the variable storing the result of an instruction + * @return the instruction that stores its result in {@code result} + */ + public Value instructionForResult(CiVariable result) { + if (variableDefs.size() > result.index) { + return variableDefs.get(result.index); + } + return null; + } + + public boolean mustStartInMemory(CiVariable operand) { + return get(mustStartInMemory, operand) || get(mustStayInMemory, operand); + } + + public boolean mustStayInMemory(CiVariable operand) { + return get(mustStayInMemory, operand); + } + + public boolean mustBeByteRegister(CiValue operand) { + return get(mustBeByteRegister, (CiVariable) operand); + } + + public void setMustBeByteRegister(CiVariable operand) { + mustBeByteRegister = set(mustBeByteRegister, operand); + } + + /** + * Gets the number of operands in this pool. This value will increase by 1 for + * each new variable operand {@linkplain #newVariable(CiKind) allocated} from this pool. + */ + public int size() { + return firstVariableNumber + variables.size(); + } + + /** + * Gets the highest operand number for a register operand in this pool. This value will + * never change for the lifetime of this pool. + */ + public int maxRegisterNumber() { + return firstVariableNumber - 1; + } +}