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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 06 May 2011 10:25:37 +0200 |
parents | 16b9a8b5ad39 |
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/* * Copyright (c) 2009, 2010, 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.lir; import com.sun.cri.ci.*; /** * An instruction operand. If the register allocator can modify this operand (e.g. to replace a * variable with a register), then it will have a corresponding entry in the {@link LIRInstruction#allocatorOperands} * list of an instruction. * * @author Doug Simon */ public class LIROperand { /** * The value of the operand. */ CiValue value; LIROperand(CiValue value) { this.value = value; } /** * Gets the value of this operand. This may still be a {@linkplain CiVariable} * if the register allocator has not yet assigned a register or stack address to the operand. * * @param inst the instruction containing this operand */ public CiValue value(LIRInstruction inst) { return value; } @Override public String toString() { return value.toString(); } static class LIRVariableOperand extends LIROperand { /** * Index into an instruction's {@linkplain LIRInstruction#allocatorOperands allocator operands}. */ final int index; LIRVariableOperand(int index) { super(null); this.index = index; } @Override public CiValue value(LIRInstruction inst) { if (value == null) { CiValue value = inst.allocatorOperands.get(index); if (value.isVariable()) { return value; } this.value = value; } return value; } @Override public String toString() { if (value == null) { return "operands[" + index + "]"; } return value.toString(); } } /** * An address operand with at least one {@linkplain CiVariable variable} constituent. */ static class LIRAddressOperand extends LIROperand { int base; int index; LIRAddressOperand(int base, int index, CiAddress address) { super(address); assert base != -1 || index != -1 : "address should have at least one variable part"; this.base = base; this.index = index; } @Override public CiValue value(LIRInstruction inst) { if (base != -1 || index != -1) { CiAddress address = (CiAddress) value; CiValue baseOperand = base == -1 ? address.base : inst.allocatorOperands.get(base); CiValue indexOperand = index == -1 ? address.index : inst.allocatorOperands.get(index); if (address.index.isLegal()) { assert indexOperand.isVariableOrRegister(); if (baseOperand.isVariable() || indexOperand.isVariable()) { return address; } } else { if (baseOperand.isVariable()) { return address; } } value = new CiAddress(address.kind, baseOperand, indexOperand, address.scale, address.displacement); base = -1; index = -1; } return value; } @Override public String toString() { return value.toString(); } } }