Mercurial > hg > graal-compiler
view graal/GraalCompiler/src/com/sun/c1x/alloc/OperandPool.java @ 2643:3b807c0c5eeb
Removed leaf type and leaf method assumptions.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:16:13 +0200 |
parents | 16b9a8b5ad39 |
children |
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/* * 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; } }