diff graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/UnsafeLoadSnippets.java @ 10801:4bfbd4be6e7a

Replace custom graph building with snippet for unsafe load lowering
author Christos Kotselidis <christos.kotselidis@oracle.com>
date Wed, 17 Jul 2013 20:23:36 +0200
parents
children 2c9332a969d6
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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/replacements/UnsafeLoadSnippets.java	Wed Jul 17 20:23:36 2013 +0200
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2013, 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.HotSpotReplacementsUtil.*;
+import static com.oracle.graal.replacements.SnippetTemplate.*;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.nodes.extended.*;
+import com.oracle.graal.nodes.spi.*;
+import com.oracle.graal.replacements.*;
+import com.oracle.graal.replacements.SnippetTemplate.AbstractTemplates;
+import com.oracle.graal.replacements.SnippetTemplate.Arguments;
+import com.oracle.graal.replacements.SnippetTemplate.SnippetInfo;
+import com.oracle.graal.word.*;
+
+public class UnsafeLoadSnippets implements Snippets {
+
+    @Snippet
+    public static Object lowerUnsafeLoad(Object object, long offset, int disp) {
+        long displacement = disp + offset;
+        if (object instanceof java.lang.ref.Reference && referentOffset() == displacement) {
+            return Word.fromObject(object).readObject((int) displacement, 1, true);
+        } else {
+            return Word.fromObject(object).readObject((int) displacement, 0, true);
+        }
+    }
+
+    public static class Templates extends AbstractTemplates {
+
+        private final SnippetInfo unsafeLoad = snippet(UnsafeLoadSnippets.class, "lowerUnsafeLoad");
+
+        public Templates(CodeCacheProvider runtime, Replacements replacements, TargetDescription target) {
+            super(runtime, replacements, target);
+        }
+
+        public void lower(UnsafeLoadNode load, @SuppressWarnings("unused") LoweringTool tool) {
+            Arguments args = new Arguments(unsafeLoad);
+            args.add("object", load.object());
+            args.add("offset", load.offset());
+            args.add("disp", load.displacement());
+            template(args).instantiate(runtime, load, DEFAULT_REPLACER, args);
+        }
+    }
+}