| /* |
| * Copyright (c) 2012, 2015, 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 org.graalvm.compiler.replacements.nodes; |
| |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_1; |
| import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; |
| |
| import org.graalvm.compiler.core.common.LIRKind; |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodeinfo.Verbosity; |
| import org.graalvm.compiler.nodes.FixedWithNextNode; |
| import org.graalvm.compiler.nodes.spi.LIRLowerable; |
| import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; |
| |
| import jdk.vm.ci.code.Register; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.Value; |
| |
| /** |
| * Access the value of a specific register. |
| */ |
| @NodeInfo(nameTemplate = "ReadRegister %{p#register}", cycles = CYCLES_1, size = SIZE_1) |
| public final class ReadRegisterNode extends FixedWithNextNode implements LIRLowerable { |
| |
| public static final NodeClass<ReadRegisterNode> TYPE = NodeClass.create(ReadRegisterNode.class); |
| /** |
| * The fixed register to access. |
| */ |
| protected final Register register; |
| |
| /** |
| * When true, subsequent uses of this node use the fixed register; when false, the value is |
| * moved into a new virtual register so that the fixed register is not seen by uses. |
| */ |
| protected final boolean directUse; |
| |
| /** |
| * When true, this node is also an implicit definition of the value for the register allocator, |
| * i.e., the register is an implicit incoming value; when false, the register must be defined in |
| * the same method or must be an register excluded from register allocation. |
| */ |
| protected final boolean incoming; |
| |
| public ReadRegisterNode(Register register, JavaKind kind, boolean directUse, boolean incoming) { |
| super(TYPE, StampFactory.forKind(kind)); |
| assert register != null; |
| this.register = register; |
| this.directUse = directUse; |
| this.incoming = incoming; |
| } |
| |
| public ReadRegisterNode(Register register, boolean directUse, boolean incoming) { |
| super(TYPE, StampFactory.forNodeIntrinsic()); |
| assert register != null; |
| this.register = register; |
| this.directUse = directUse; |
| this.incoming = incoming; |
| } |
| |
| @Override |
| public void generate(NodeLIRBuilderTool generator) { |
| LIRKind kind = generator.getLIRGeneratorTool().getLIRKind(stamp()); |
| Value result = register.asValue(kind); |
| if (incoming) { |
| generator.getLIRGeneratorTool().emitIncomingValues(new Value[]{result}); |
| } |
| if (!directUse) { |
| result = generator.getLIRGeneratorTool().emitMove(result); |
| } |
| generator.setResult(this, result); |
| } |
| |
| @Override |
| public String toString(Verbosity verbosity) { |
| if (verbosity == Verbosity.Name) { |
| return super.toString(Verbosity.Name) + "%" + register; |
| } else { |
| return super.toString(verbosity); |
| } |
| } |
| } |