--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.asm/src/com/oracle/jvmci/asm/Assembler.java	Wed Jun 03 18:06:44 2015 +0200
@@ -0,0 +1,259 @@
+/*
+ * Copyright (c) 2009, 2011, 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.jvmci.asm;
+
+import java.nio.*;
+import java.util.*;
+
+import com.oracle.jvmci.code.*;
+
+/**
+ * The platform-independent base class for the assembler.
+ */
+public abstract class Assembler {
+
+    public final TargetDescription target;
+    private List<LabelHint> jumpDisplacementHints;
+
+    /**
+     * Backing code buffer.
+     */
+    private final Buffer codeBuffer;
+
+    public Assembler(TargetDescription target) {
+        this.target = target;
+        if (target.arch.getByteOrder() == ByteOrder.BIG_ENDIAN) {
+            this.codeBuffer = new Buffer.BigEndian();
+        } else {
+            this.codeBuffer = new Buffer.LittleEndian();
+        }
+    }
+
+    /**
+     * Returns the current position of the underlying code buffer.
+     *
+     * @return current position in code buffer
+     */
+    public int position() {
+        return codeBuffer.position();
+    }
+
+    public final void emitByte(int x) {
+        codeBuffer.emitByte(x);
+    }
+
+    public final void emitShort(int x) {
+        codeBuffer.emitShort(x);
+    }
+
+    public final void emitInt(int x) {
+        codeBuffer.emitInt(x);
+    }
+
+    public final void emitLong(long x) {
+        codeBuffer.emitLong(x);
+    }
+
+    public final void emitByte(int b, int pos) {
+        codeBuffer.emitByte(b, pos);
+    }
+
+    public final void emitShort(int b, int pos) {
+        codeBuffer.emitShort(b, pos);
+    }
+
+    public final void emitInt(int b, int pos) {
+        codeBuffer.emitInt(b, pos);
+    }
+
+    public final void emitLong(long b, int pos) {
+        codeBuffer.emitLong(b, pos);
+    }
+
+    public final int getByte(int pos) {
+        return codeBuffer.getByte(pos);
+    }
+
+    public final int getShort(int pos) {
+        return codeBuffer.getShort(pos);
+    }
+
+    public final int getInt(int pos) {
+        return codeBuffer.getInt(pos);
+    }
+
+    private static final String NEWLINE = System.getProperty("line.separator");
+
+    /**
+     * Some GPU architectures have a text based encoding.
+     */
+    public final void emitString(String x) {
+        emitString0("\t");  // XXX REMOVE ME pretty-printing
+        emitString0(x);
+        emitString0(NEWLINE);
+    }
+
+    // XXX for pretty-printing
+    public final void emitString0(String x) {
+        codeBuffer.emitBytes(x.getBytes(), 0, x.length());
+    }
+
+    public void emitString(String s, int pos) {
+        codeBuffer.emitBytes(s.getBytes(), pos);
+    }
+
+    /**
+     * Closes this assembler. No extra data can be written to this assembler after this call.
+     *
+     * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not
+     *            including) {@code position()} is returned
+     * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true}
+     */
+    public byte[] close(boolean trimmedCopy) {
+        return codeBuffer.close(trimmedCopy);
+    }
+
+    public void bind(Label l) {
+        assert !l.isBound() : "can bind label only once";
+        l.bind(position());
+        l.patchInstructions(this);
+    }
+
+    public abstract void align(int modulus);
+
+    public abstract void jmp(Label l);
+
+    protected abstract void patchJumpTarget(int branch, int jumpTarget);
+
+    private Map<Label, String> nameMap;
+
+    /**
+     * Creates a name for a label.
+     *
+     * @param l the label for which a name is being created
+     * @param id a label identifier that is unique with the scope of this assembler
+     * @return a label name in the form of "L123"
+     */
+    protected String createLabelName(Label l, int id) {
+        return "L" + id;
+    }
+
+    /**
+     * Gets a name for a label, creating it if it does not yet exist. By default, the returned name
+     * is only unique with the scope of this assembler.
+     */
+    public String nameOf(Label l) {
+        if (nameMap == null) {
+            nameMap = new HashMap<>();
+        }
+        String name = nameMap.get(l);
+        if (name == null) {
+            name = createLabelName(l, nameMap.size());
+            nameMap.put(l, name);
+        }
+        return name;
+    }
+
+    /**
+     * This is used by the CompilationResultBuilder to convert a {@link StackSlot} to an
+     * {@link AbstractAddress}.
+     */
+    public abstract AbstractAddress makeAddress(Register base, int displacement);
+
+    /**
+     * Returns a target specific placeholder address that can be used for code patching.
+     */
+    public abstract AbstractAddress getPlaceholder();
+
+    /**
+     * Emits a NOP instruction to advance the current PC.
+     */
+    public abstract void ensureUniquePC();
+
+    public void reset() {
+        codeBuffer.reset();
+        captureLabelPositions();
+    }
+
+    private void captureLabelPositions() {
+        if (jumpDisplacementHints == null) {
+            return;
+        }
+        for (LabelHint request : this.jumpDisplacementHints) {
+            request.capture();
+        }
+    }
+
+    public LabelHint requestLabelHint(Label label) {
+        if (jumpDisplacementHints == null) {
+            jumpDisplacementHints = new ArrayList<>();
+        }
+        LabelHint hint = new LabelHint(label, position());
+        this.jumpDisplacementHints.add(hint);
+        return hint;
+    }
+
+    public InstructionCounter getInstructionCounter() {
+        throw new UnsupportedOperationException("Instruction counter is not implemented for " + this);
+    }
+
+    public static class LabelHint {
+        private Label label;
+        private int forPosition;
+        private int capturedTarget = -1;
+
+        protected LabelHint(Label label, int lastPosition) {
+            super();
+            this.label = label;
+            this.forPosition = lastPosition;
+        }
+
+        protected void capture() {
+            this.capturedTarget = label.position();
+        }
+
+        public int getTarget() {
+            assert isValid();
+            return capturedTarget;
+        }
+
+        public int getPosition() {
+            assert isValid();
+            return forPosition;
+        }
+
+        public boolean isValid() {
+            return capturedTarget >= 0;
+        }
+    }
+
+    /**
+     * Instruction counter class which gives the user of the assembler to count different kinds of
+     * instructions in the generated assembler code.
+     */
+    public interface InstructionCounter {
+        String[] getSupportedInstructionTypes();
+
+        int[] countInstructions(String[] instructionTypes, int beginPc, int endPc);
+    }
+}