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annotate graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/target/Backend.java @ 5507:dc71b06d09f8

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Moving classes from cri.ri to api.meta.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 07 Jun 2012 18:24:06 +0200
parents 56860d3f9f39
children 426c605c9d3c
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1 /*
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2 * Copyright (c) 2009, 2012, 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.compiler.target;
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24
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25 import java.lang.reflect.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.compiler.*;
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29 import com.oracle.graal.compiler.gen.*;
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30 import com.oracle.graal.graph.*;
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31 import com.oracle.graal.lir.*;
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32 import com.oracle.graal.lir.asm.*;
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33 import com.oracle.max.cri.ci.*;
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34 import com.oracle.max.cri.ri.*;
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35 import com.oracle.max.cri.xir.*;
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36
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37 /**
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38 * The {@code Backend} class represents a compiler backend for Graal.
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39 */
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40 public abstract class Backend {
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41
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42 /**
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43 * The name of the system property whose value (if non-null) specifies the fully qualified
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44 * name of the class to be instantiated by {@link #create(RiRuntime, CiTarget)}.
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45 */
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46 public static final String BACKEND_CLASS_PROPERTY = "graal.compiler.backend.class";
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47
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48 public final RiRuntime runtime;
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49 public final CiTarget target;
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50
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51 protected Backend(RiRuntime runtime, CiTarget target) {
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52 this.runtime = runtime;
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53 this.target = target;
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54 }
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55
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56 /**
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57 * Creates the architecture and runtime specific back-end object.
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58 * The class of the object instantiated must be in the {@link #BACKEND_CLASS_PROPERTY} system property.
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59 */
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60 public static Backend create(RiRuntime runtime, CiTarget target) {
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61 String className = System.getProperty(BACKEND_CLASS_PROPERTY);
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62 assert className != null : "System property must be defined: " + BACKEND_CLASS_PROPERTY;
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63 try {
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64 Class<?> c = Class.forName(className);
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65 Constructor<?> cons = c.getDeclaredConstructor(RiRuntime.class, CiTarget.class);
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66 return (Backend) cons.newInstance(runtime, target);
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67 } catch (Exception e) {
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68 throw new Error("Could not instantiate " + className, e);
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69 }
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70 }
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71
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72 public FrameMap newFrameMap(CiRegisterConfig registerConfig) {
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73 return new FrameMap(runtime, target, registerConfig);
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74 }
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75
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76 public abstract LIRGenerator newLIRGenerator(Graph graph, FrameMap frameMap, RiResolvedMethod method, LIR lir, RiXirGenerator xir, CiAssumptions assumptions);
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77
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78 public abstract TargetMethodAssembler newAssembler(FrameMap frameMap, LIR lir);
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79
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80 public abstract CiXirAssembler newXirAssembler();
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81
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82 /**
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83 * Emits code to do stack overflow checking.
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84 *
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85 * @param afterFrameInit specifies if the stack pointer has already been adjusted to allocate the current frame
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86 */
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87 protected static void emitStackOverflowCheck(TargetMethodAssembler tasm, boolean afterFrameInit) {
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88 if (GraalOptions.StackShadowPages > 0) {
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89 int frameSize = tasm.frameMap.frameSize();
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90 if (frameSize > 0) {
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91 int lastFramePage = frameSize / tasm.target.pageSize;
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92 // emit multiple stack bangs for methods with frames larger than a page
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93 for (int i = 0; i <= lastFramePage; i++) {
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94 int disp = (i + GraalOptions.StackShadowPages) * tasm.target.pageSize;
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95 if (afterFrameInit) {
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96 disp -= frameSize;
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97 }
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98 tasm.blockComment("[stack overflow check]");
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99 tasm.asm.bangStack(disp);
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100 }
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101 }
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102 }
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103 }
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104
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105 /**
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106 * Emits the code for a given method. This includes any architecture/runtime specific
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107 * prefix/suffix. A prefix typically contains the code for setting up the frame,
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108 * spilling callee-save registers, stack overflow checking, handling multiple entry
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109 * points etc. A suffix may contain out-of-line stubs and method end guard instructions.
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110 *
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111 * @param the method associated with {@code lir}
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112 * @param lir the LIR of {@code method}
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113 */
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114 public abstract void emitCode(TargetMethodAssembler tasm, RiResolvedMethod method, LIR lir);
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115 }