--- a/graal/com.oracle.graal.api.directives/src/com/oracle/graal/api/directives/GraalDirectives.java	Thu Nov 19 14:56:27 2015 +0100
+++ b/graal/com.oracle.graal.api.directives/src/com/oracle/graal/api/directives/GraalDirectives.java	Wed Nov 18 15:53:20 2015 +0100
@@ -179,6 +179,12 @@
     }
 
     /**
+     * Spills all caller saved registers.
+     */
+    public static void spillRegisters() {
+    }
+
+    /**
      * Do nothing, but also make sure the compiler doesn't do any optimizations across this call.
      *
      * For example, the compiler will constant fold the expression 5 * 3, but the expression 5 *

--- a/graal/com.oracle.graal.lir/src/com/oracle/graal/lir/StandardOp.java	Thu Nov 19 14:56:27 2015 +0100
+++ b/graal/com.oracle.graal.lir/src/com/oracle/graal/lir/StandardOp.java	Wed Nov 18 15:53:20 2015 +0100
@@ -380,6 +380,25 @@
         }
     }
 
+    @Opcode("SPILLREGISTERS")
+    public static final class SpillRegistersOp extends LIRInstruction {
+        public static final LIRInstructionClass<SpillRegistersOp> TYPE = LIRInstructionClass.create(SpillRegistersOp.class);
+
+        public SpillRegistersOp() {
+            super(TYPE);
+        }
+
+        @Override
+        public boolean destroysCallerSavedRegisters() {
+            return true;
+        }
+
+        @Override
+        public void emitCode(CompilationResultBuilder crb) {
+            // do nothing, just keep value alive until at least here
+        }
+    }
+
     public static final class StackMove extends LIRInstruction implements ValueMoveOp {
         public static final LIRInstructionClass<StackMove> TYPE = LIRInstructionClass.create(StackMove.class);
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/debug/SpillRegistersNode.java	Wed Nov 18 15:53:20 2015 +0100
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2015, 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 com.oracle.graal.nodes.debug;
+
+import com.oracle.graal.compiler.common.type.StampFactory;
+import com.oracle.graal.graph.NodeClass;
+import com.oracle.graal.lir.StandardOp;
+import com.oracle.graal.nodeinfo.NodeInfo;
+import com.oracle.graal.nodes.FixedWithNextNode;
+import com.oracle.graal.nodes.spi.LIRLowerable;
+import com.oracle.graal.nodes.spi.NodeLIRBuilderTool;
+
+@NodeInfo
+public final class SpillRegistersNode extends FixedWithNextNode implements LIRLowerable {
+
+    public static final NodeClass<SpillRegistersNode> TYPE = NodeClass.create(SpillRegistersNode.class);
+
+    protected Object unique;
+
+    public SpillRegistersNode() {
+        super(TYPE, StampFactory.forVoid());
+        // prevent control-flow optimization
+        this.unique = new Object();
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool gen) {
+        gen.getLIRGeneratorTool().append(new StandardOp.SpillRegistersOp());
+    }
+}

--- a/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/StandardGraphBuilderPlugins.java	Thu Nov 19 14:56:27 2015 +0100
+++ b/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/StandardGraphBuilderPlugins.java	Wed Nov 18 15:53:20 2015 +0100
@@ -69,6 +69,7 @@
 import com.oracle.graal.nodes.debug.BlackholeNode;
 import com.oracle.graal.nodes.debug.ControlFlowAnchorNode;
 import com.oracle.graal.nodes.debug.OpaqueNode;
+import com.oracle.graal.nodes.debug.SpillRegistersNode;
 import com.oracle.graal.nodes.extended.BoxNode;
 import com.oracle.graal.nodes.extended.BranchProbabilityNode;
 import com.oracle.graal.nodes.extended.GetClassNode;
@@ -681,6 +682,14 @@
             }
         }
 
+        InvocationPlugin spillPlugin = new InvocationPlugin() {
+            public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver) {
+                b.add(new SpillRegistersNode());
+                return true;
+            }
+        };
+        r.register0("spillRegisters", spillPlugin);
+
         r.register1("guardingNonNull", Object.class, new InvocationPlugin() {
             public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode value) {
                 ObjectStamp objectStamp = (ObjectStamp) value.stamp();