Mercurial > hg > graal-jvmci-8

annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/RegisterConfig.java @ 22672:1bbd4a7c274b

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Rename jdk.internal.jvmci to jdk.vm.ci
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Thu, 08 Oct 2015 17:28:41 -0700
parents jvmci/jdk.internal.jvmci.code/src/jdk/internal/jvmci/code/RegisterConfig.java@ec96f33a101d
children d63506bb5237
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1 /*
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2 * Copyright (c) 2009, 2015, 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 jdk.vm.ci.code;
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24
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25 import jdk.vm.ci.code.CallingConvention.Type;
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26 import jdk.vm.ci.meta.JavaKind;
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27 import jdk.vm.ci.meta.JavaType;
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28 import jdk.vm.ci.meta.PlatformKind;
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29
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30 /**
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31 * A register configuration binds roles and {@linkplain RegisterAttributes attributes} to physical
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32 * registers.
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33 */
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34 public interface RegisterConfig {
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35
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36 /**
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37 * Gets the register to be used for returning a value of a given kind.
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38 */
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39 Register getReturnRegister(JavaKind kind);
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40
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41 /**
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42 * Gets the maximum allowed size of the frame.
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43 */
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44 default int getMaximumFrameSize() {
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45 return Integer.MAX_VALUE;
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46 }
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47
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48 /**
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49 * Gets the register to which {@link Register#Frame} and {@link Register#CallerFrame} are bound.
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50 */
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51 Register getFrameRegister();
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52
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53 /**
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54 * Gets the calling convention describing how arguments are passed.
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55 *
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56 * @param type the type of calling convention being requested
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57 * @param returnType the return type (can be null for methods returning {@code void})
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58 * @param parameterTypes the types of the arguments of the call
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59 * @param target the target platform
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60 * @param stackOnly ignore registers
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61 */
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62 CallingConvention getCallingConvention(Type type, JavaType returnType, JavaType[] parameterTypes, TargetDescription target, boolean stackOnly);
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63
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64 /**
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65 * Gets the ordered set of registers that are can be used to pass parameters according to a
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66 * given calling convention.
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67 *
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68 * @param type the type of calling convention
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69 * @param kind specifies what kind of registers is being requested
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70 * @return the ordered set of registers that may be used to pass parameters in a call conforming
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71 * to {@code type}
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72 */
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73 Register[] getCallingConventionRegisters(Type type, JavaKind kind);
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74
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75 /**
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76 * Gets the set of all registers that might be used by the register allocator.
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77 *
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78 * To get the set of registers the register allocator is allowed to use see
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79 * {@link RegisterAllocationConfig#getAllocatableRegisters()}
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80 */
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81 @SuppressWarnings("javadoc")
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82 Register[] getAllocatableRegisters();
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83
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84 /**
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85 * Filters a set of registers and returns only those that can be used by the register allocator
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86 * for a value of a particular kind.
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87 */
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88 Register[] filterAllocatableRegisters(PlatformKind kind, Register[] registers);
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89
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90 /**
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91 * Gets the registers whose values must be preserved by a method across any call it makes.
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92 */
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93 Register[] getCallerSaveRegisters();
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94
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95 /**
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96 * Gets the registers whose values must be preserved by the callee.
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97 */
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98 Register[] getCalleeSaveRegisters();
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99
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100 /**
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101 * Gets a map from register {@linkplain Register#number numbers} to register
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102 * {@linkplain RegisterAttributes attributes} for this register configuration.
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103 *
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104 * @return an array where an element at index i holds the attributes of the register whose
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105 * number is i
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106 */
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107 RegisterAttributes[] getAttributesMap();
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108
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109 /**
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110 * Gets the register corresponding to a runtime-defined role.
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111 *
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112 * @param id the identifier of a runtime-defined register role
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113 * @return the register playing the role specified by {@code id}
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114 */
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115 Register getRegisterForRole(int id);
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116
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117 /**
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118 * Determines if all {@link #getAllocatableRegisters() allocatable} registers are
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119 * {@link #getCallerSaveRegisters() caller saved}.
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120 */
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121 boolean areAllAllocatableRegistersCallerSaved();
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122 }