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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/Frame.java @ 9330:e162d9e32830

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Added a clazz parameter to Frame.getArguments in order to allow unsafe access to the arguments object (i.e., avoiding the null check and the type cast).
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Fri, 26 Apr 2013 17:15:10 +0200
parents 07f8d136a05e
children 0fccad3ce40d
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1 /*
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2 * Copyright (c) 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.truffle.api.frame;
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25 import com.oracle.truffle.api.*;
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27 /**
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28 * Represents a frame containing values of local variables of the guest language. Instances of this
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29 * type must not be stored in a field or cast to {@link java.lang.Object}.
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30 */
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31 public interface Frame {
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32
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33 /**
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34 * @return the object describing the layout of this frame
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35 */
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36 FrameDescriptor getFrameDescriptor();
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37
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38 /**
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39 * Retrieves the arguments object from this frame. The runtime assumes that the arguments object
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40 * is never null. Additionally, the runtime may assume that the given parameter indicating the
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41 * class of the arguments object is correct. The runtime is not required to actually check the
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42 * type of the arguments object. The parameter must be a value that can be reduced to a compile
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43 * time constant.
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44 *
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45 * @param clazz the known type of the arguments object as a compile time constant
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46 * @return the arguments used when calling this method
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47 */
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48 <T extends Arguments> T getArguments(Class<T> clazz);
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49
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50 /**
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51 * Read access to a local variable of type {@link Object}.
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52 *
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53 * @param slot the slot of the local variable
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54 * @return the current value of the local variable
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55 */
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56 Object getObject(FrameSlot slot) throws FrameSlotTypeException;
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57
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58 /**
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59 * Write access to a local variable of type {@link Object}.
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60 *
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61 * @param slot the slot of the local variable
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62 * @param value the new value of the local variable
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63 */
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64 void setObject(FrameSlot slot, Object value) throws FrameSlotTypeException;
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65
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66 /**
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67 * Read access to a local variable of type boolean.
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68 *
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69 * @param slot the slot of the local variable
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70 * @return the current value of the local variable
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71 */
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72 boolean getBoolean(FrameSlot slot) throws FrameSlotTypeException;
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74 /**
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75 * Write access to a local variable of type boolean.
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76 *
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77 * @param slot the slot of the local variable
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78 * @param value the new value of the local variable
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79 */
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80 void setBoolean(FrameSlot slot, boolean value) throws FrameSlotTypeException;
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82 /**
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83 * Read access to a local variable of type int.
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84 *
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85 * @param slot the slot of the local variable
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86 * @return the current value of the local variable
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87 */
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88 int getInt(FrameSlot slot) throws FrameSlotTypeException;
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89
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90 /**
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91 * Write access to a local variable of type int.
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92 *
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93 * @param slot the slot of the local variable
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94 * @param value the new value of the local variable
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95 */
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96 void setInt(FrameSlot slot, int value) throws FrameSlotTypeException;
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97
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98 /**
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99 * Read access to a local variable of type long.
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100 *
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101 * @param slot the slot of the local variable
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102 * @return the current value of the local variable
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103 */
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104 long getLong(FrameSlot slot) throws FrameSlotTypeException;
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105
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106 /**
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107 * Write access to a local variable of type long.
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108 *
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109 * @param slot the slot of the local variable
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110 * @param value the new value of the local variable
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111 */
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112 void setLong(FrameSlot slot, long value) throws FrameSlotTypeException;
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113
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114 /**
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115 * Read access to a local variable of type float.
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116 *
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117 * @param slot the slot of the local variable
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118 * @return the current value of the local variable
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119 */
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120 float getFloat(FrameSlot slot) throws FrameSlotTypeException;
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121
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122 /**
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123 * Write access to a local variable of type float.
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124 *
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125 * @param slot the slot of the local variable
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126 * @param value the new value of the local variable
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127 */
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128 void setFloat(FrameSlot slot, float value) throws FrameSlotTypeException;
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129
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130 /**
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131 * Read access to a local variable of type double.
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132 *
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133 * @param slot the slot of the local variable
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134 * @return the current value of the local variable
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135 */
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136 double getDouble(FrameSlot slot) throws FrameSlotTypeException;
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137
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138 /**
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139 * Write access to a local variable of type double.
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140 *
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141 * @param slot the slot of the local variable
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142 * @param value the new value of the local variable
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143 */
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144 void setDouble(FrameSlot slot, double value) throws FrameSlotTypeException;
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145
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146 /**
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147 * Read access to a local variable of any type.
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148 *
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149 * @param slot the slot of the local variable
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150 * @return the current value of the local variable or defaultValue if unset
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151 */
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152 Object getValue(FrameSlot slot);
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153
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154 /**
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155 * Converts this virtual frame into a packed frame that has no longer direct access to the local
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156 * variables. This packing is an important hint to the Truffle optimizer and therefore passing
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157 * around a {@link PackedFrame} should be preferred over passing around a {@link VirtualFrame}
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158 * when the probability that an unpacking will occur is low.
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159 *
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160 * @return the packed frame
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161 */
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162 PackedFrame pack();
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163
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164 /**
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165 * Materializes this frame, which allows it to be stored in a field or cast to
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166 * {@link java.lang.Object}. The frame however looses the ability to be packed or to access the
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167 * caller frame.
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168 *
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169 * @return the new materialized frame
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170 */
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171 MaterializedFrame materialize();
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172 }