Mercurial > hg > graal-compiler
changeset 13595:7acbe6efed0d
added AllocaNode for reserving a block of memory in the stack frame of a method
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Sun, 12 Jan 2014 15:01:24 +0100 |
parents | fcabc0da42b0 |
children | dd0ba029bf34 |
files | graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/AllocaNode.java |
diffstat | 1 files changed, 65 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/AllocaNode.java Sun Jan 12 15:01:24 2014 +0100 @@ -0,0 +1,65 @@ +/* + * Copyright (c) 2012, 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.oracle.graal.hotspot.nodes; + +import java.util.*; + +import com.oracle.graal.api.code.*; +import com.oracle.graal.api.meta.*; +import com.oracle.graal.compiler.gen.*; +import com.oracle.graal.compiler.target.*; +import com.oracle.graal.hotspot.*; +import com.oracle.graal.nodes.*; +import com.oracle.graal.nodes.type.*; + +/** + * Reserves a block of memory in the stack frame of a method. The block is reserved in the frame for + * the entire execution of the associated method. + */ +public final class AllocaNode extends FixedWithNextNode implements LIRGenLowerable { + + /** + * The number of slots in block. + */ + private final int slots; + + /** + * The indexes of the object pointer slots in the block. Each such object pointer slot must be + * initialized before any safepoint in the method otherwise the garbage collector will see + * garbage values when processing these slots. + */ + private final BitSet objects; + + public AllocaNode(int slots, BitSet objects) { + super(StampFactory.forKind(HotSpotGraalRuntime.getHostWordKind())); + this.slots = slots; + this.objects = objects; + } + + @Override + public void generate(LIRGenerator gen) { + StackSlot array = gen.frameMap().allocateStackSlots(slots, objects, null); + Value result = gen.emitAddress(array); + gen.setResult(this, result); + } +}