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annotate graal/com.oracle.graal.asm/src/com/oracle/graal/asm/AbstractAssembler.java @ 7353:b5280041f59e

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Experiment with soft alignment for branch targets.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 13 Jan 2013 19:32:16 +0100
parents cc32ce37eddc
children 4c6e577d0c01
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.asm;
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25 import com.oracle.graal.api.code.*;
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26 import com.oracle.graal.api.code.Architecture.*;
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27
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28 /**
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29 * The platform-independent base class for the assembler.
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30 */
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31 public abstract class AbstractAssembler {
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32 public final TargetDescription target;
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33 public final Buffer codeBuffer;
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34
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35 public AbstractAssembler(TargetDescription target) {
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36 this.target = target;
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37
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38 if (target.arch.getByteOrder() == ByteOrder.BigEndian) {
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39 this.codeBuffer = new Buffer.BigEndian();
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40 } else {
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41 this.codeBuffer = new Buffer.LittleEndian();
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42 }
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43 }
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44
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45 public final void bind(Label l) {
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46 assert !l.isBound() : "can bind label only once";
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47 l.bind(codeBuffer.position());
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48 l.patchInstructions(this);
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49 }
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50
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51 public abstract void align(int modulus);
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52
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53 public abstract void softAlign(int modulus);
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54
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55 public abstract void jmp(Label l);
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56
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57 protected abstract void patchJumpTarget(int branch, int jumpTarget);
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59 /**
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60 * Emits instruction(s) that access an address specified by a given displacement from the stack pointer
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61 * in the direction that the stack grows (which is down on most architectures).
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62 *
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63 * @param disp the displacement from the stack pointer at which the stack should be accessed
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64 */
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65 public abstract void bangStack(int disp);
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66
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67 protected final void emitByte(int x) {
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68 codeBuffer.emitByte(x);
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69 }
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71 protected final void emitShort(int x) {
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72 codeBuffer.emitShort(x);
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73 }
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75 protected final void emitInt(int x) {
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76 codeBuffer.emitInt(x);
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77 }
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79 protected final void emitLong(long x) {
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80 codeBuffer.emitLong(x);
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81 }
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82 }