Mercurial > hg > graal-jvmci-8
diff graal/Compiler/src/com/sun/c1x/lir/LIROperand.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/lir/LIROperand.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,134 @@ +/* + * 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(); + } + } +}