--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/WriteBarrierSnippets.java	Fri Mar 22 12:56:04 2013 +0100
@@ -0,0 +1,208 @@
+/*
+ * 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.replacements;
+
+import static com.oracle.graal.hotspot.replacements.HotSpotSnippetUtils.*;
+import static com.oracle.graal.replacements.SnippetTemplate.*;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.hotspot.nodes.*;
+import com.oracle.graal.nodes.spi.*;
+import com.oracle.graal.replacements.*;
+import com.oracle.graal.replacements.Snippet.ConstantParameter;
+import com.oracle.graal.replacements.Snippet.Parameter;
+import com.oracle.graal.replacements.SnippetTemplate.AbstractTemplates;
+import com.oracle.graal.replacements.SnippetTemplate.Arguments;
+import com.oracle.graal.replacements.SnippetTemplate.Key;
+import com.oracle.graal.word.*;
+
+public class WriteBarrierSnippets implements Snippets {
+
+    @Snippet
+    public static void g1PreWriteBarrier(@Parameter("object") Object obj, @Parameter("expectedObject") Object expobj, @Parameter("location") Object location,
+                    @ConstantParameter("doLoad") boolean doLoad) {
+        Word thread = thread();
+        Object object = FixedValueAnchorNode.getObject(obj);
+        Object expectedObject = FixedValueAnchorNode.getObject(expobj);
+        Pointer field = Word.fromArray(object, location);
+        Pointer previousOop = Word.fromObject(expectedObject);
+        byte markingValue = thread.readByte(HotSpotSnippetUtils.g1SATBQueueMarkingOffset());
+
+        Word bufferAddress = thread.readWord(HotSpotSnippetUtils.g1SATBQueueBufferOffset());
+        Word indexAddress = thread.add(HotSpotSnippetUtils.g1SATBQueueIndexOffset());
+        Word indexValue = indexAddress.readWord(0);
+
+        if (markingValue != (byte) 0) {
+            if (doLoad) {
+                previousOop = field.readWord(0);
+            }
+            if (previousOop.notEqual(Word.zero())) {
+                if (indexValue.notEqual(Word.zero())) {
+                    Word nextIndex = indexValue.subtract(HotSpotSnippetUtils.wordSize());
+                    Word logAddress = bufferAddress.add(nextIndex);
+                    logAddress.writeWord(0, previousOop);
+                    indexAddress.writeWord(0, nextIndex);
+                } else {
+                    WriteBarrierPreStubCall.call(previousOop);
+
+                }
+            }
+        }
+    }
+
+    @Snippet
+    public static void g1PostWriteBarrier(@Parameter("object") Object obj, @Parameter("value") Object value, @Parameter("location") Object location, @ConstantParameter("usePrecise") boolean usePrecise) {
+        Word thread = thread();
+        Object object = FixedValueAnchorNode.getObject(obj);
+        Object wrObject = FixedValueAnchorNode.getObject(value);
+        Pointer oop = Word.fromObject(object);
+        Pointer field;
+        if (usePrecise) {
+            field = Word.fromArray(object, location);
+        } else {
+            field = oop;
+        }
+        Pointer writtenValue = Word.fromObject(wrObject);
+        Word bufferAddress = thread.readWord(HotSpotSnippetUtils.g1CardQueueBufferOffset());
+        Word indexAddress = thread.add(HotSpotSnippetUtils.g1CardQueueIndexOffset());
+        Word indexValue = thread.readWord(HotSpotSnippetUtils.g1CardQueueIndexOffset());
+        Word xorResult = ((Word) field.xor(writtenValue)).unsignedShiftRight(HotSpotSnippetUtils.logOfHRGrainBytes());
+
+        // Card Table
+        Word cardBase = (Word) field.unsignedShiftRight(cardTableShift());
+        long startAddress = cardTableStart();
+        int displacement = 0;
+        if (((int) startAddress) == startAddress) {
+            displacement = (int) startAddress;
+        } else {
+            cardBase = cardBase.add(Word.unsigned(cardTableStart()));
+        }
+        Word cardAddress = cardBase.add(displacement);
+
+        if (xorResult.notEqual(Word.zero())) {
+            if (writtenValue.notEqual(Word.zero())) {
+                byte cardByte = cardAddress.readByte(0);
+                if (cardByte != (byte) 0) {
+                    cardAddress.writeByte(0, (byte) 0); // smash zero into card
+                    if (indexValue.notEqual(Word.zero())) {
+                        Word nextIndex = indexValue.subtract(HotSpotSnippetUtils.wordSize());
+                        Word logAddress = bufferAddress.add(nextIndex);
+                        logAddress.writeWord(0, cardAddress);
+                        indexAddress.writeWord(0, nextIndex);
+                    } else {
+                        WriteBarrierPostStubCall.call(object, cardAddress);
+                    }
+                }
+            }
+        }
+    }
+
+    @Snippet
+    public static void serialFieldWriteBarrier(@Parameter("object") Object object) {
+        Pointer oop = Word.fromObject(object);
+        Word base = (Word) oop.unsignedShiftRight(cardTableShift());
+        long startAddress = cardTableStart();
+        int displacement = 0;
+        if (((int) startAddress) == startAddress) {
+            displacement = (int) startAddress;
+        } else {
+            base = base.add(Word.unsigned(cardTableStart()));
+        }
+        base.writeWord(displacement, Word.zero());
+    }
+
+    @Snippet
+    public static void serialArrayWriteBarrier(@Parameter("object") Object object, @Parameter("location") Object location) {
+        Pointer oop = Word.fromArray(object, location);
+        Word base = (Word) oop.unsignedShiftRight(cardTableShift());
+        long startAddress = cardTableStart();
+        int displacement = 0;
+        if (((int) startAddress) == startAddress) {
+            displacement = (int) startAddress;
+        } else {
+            base = base.add(Word.unsigned(cardTableStart()));
+        }
+        base.writeWord(displacement, Word.zero());
+    }
+
+    public static class Templates extends AbstractTemplates<WriteBarrierSnippets> {
+
+        private final ResolvedJavaMethod serialFieldWriteBarrier;
+        private final ResolvedJavaMethod serialArrayWriteBarrier;
+        private final ResolvedJavaMethod g1PreWriteBarrier;
+        private final ResolvedJavaMethod g1PostWriteBarrier;
+
+        public Templates(CodeCacheProvider runtime, Assumptions assumptions, TargetDescription target) {
+            super(runtime, assumptions, target, WriteBarrierSnippets.class);
+            serialFieldWriteBarrier = snippet("serialFieldWriteBarrier", Object.class);
+            serialArrayWriteBarrier = snippet("serialArrayWriteBarrier", Object.class, Object.class);
+            g1PreWriteBarrier = snippet("g1PreWriteBarrier", Object.class, Object.class, Object.class, boolean.class);
+            g1PostWriteBarrier = snippet("g1PostWriteBarrier", Object.class, Object.class, Object.class, boolean.class);
+        }
+
+        public void lower(ArrayWriteBarrier arrayWriteBarrier, @SuppressWarnings("unused") LoweringTool tool) {
+            ResolvedJavaMethod method = serialArrayWriteBarrier;
+            Key key = new Key(method);
+            Arguments arguments = new Arguments();
+            arguments.add("object", arrayWriteBarrier.object());
+            arguments.add("location", arrayWriteBarrier.location());
+            SnippetTemplate template = cache.get(key, assumptions);
+            template.instantiate(runtime, arrayWriteBarrier, DEFAULT_REPLACER, arguments);
+        }
+
+        public void lower(FieldWriteBarrier fieldWriteBarrier, @SuppressWarnings("unused") LoweringTool tool) {
+            ResolvedJavaMethod method = serialFieldWriteBarrier;
+            Key key = new Key(method);
+            Arguments arguments = new Arguments();
+            arguments.add("object", fieldWriteBarrier.object());
+            SnippetTemplate template = cache.get(key, assumptions);
+            template.instantiate(runtime, fieldWriteBarrier, DEFAULT_REPLACER, arguments);
+        }
+
+        public void lower(WriteBarrierPre writeBarrierPre, @SuppressWarnings("unused") LoweringTool tool) {
+            ResolvedJavaMethod method = g1PreWriteBarrier;
+            Key key = new Key(method);
+            key.add("doLoad", writeBarrierPre.doLoad());
+            Arguments arguments = new Arguments();
+            arguments.add("object", writeBarrierPre.getObject());
+            arguments.add("expectedObject", writeBarrierPre.getExpectedObject());
+            arguments.add("location", writeBarrierPre.getLocation());
+            SnippetTemplate template = cache.get(key, assumptions);
+            template.instantiate(runtime, writeBarrierPre, DEFAULT_REPLACER, arguments);
+        }
+
+        public void lower(WriteBarrierPost writeBarrierPost, @SuppressWarnings("unused") LoweringTool tool) {
+            ResolvedJavaMethod method = g1PostWriteBarrier;
+            Key key = new Key(method);
+            key.add("usePrecise", writeBarrierPost.usePrecise());
+            Arguments arguments = new Arguments();
+            arguments.add("object", writeBarrierPost.getObject());
+            arguments.add("location", writeBarrierPost.getLocation());
+            arguments.add("value", writeBarrierPost.getValue());
+            SnippetTemplate template = cache.get(key, assumptions);
+            template.instantiate(runtime, writeBarrierPost, DEFAULT_REPLACER, arguments);
+        }
+
+    }
+}