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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/CallingConvention.java @ 9296:1342574c4f7d

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Move targets can only be AllocatableValues.
author Roland Schatz <roland.schatz@oracle.com>
date Thu, 25 Apr 2013 16:14:42 +0200
parents 5e3d1a68664e
children c455c86138ba
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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.api.code;
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24
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25 import static com.oracle.graal.api.code.ValueUtil.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28
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29 /**
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30 * A calling convention describes the locations in which the arguments for a call are placed, the
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31 * location in which the return value is placed if the call is not void and any
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32 * {@linkplain #getTemporaries() extra} locations used (and killed) by the call.
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33 */
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34 public class CallingConvention {
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35
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36 /**
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37 * Constants denoting the type of a call for which a calling convention is requested.
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38 */
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39 public enum Type {
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40 /**
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41 * A request for the outgoing argument locations at a call site to Java code.
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42 */
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43 JavaCall(true),
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44
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45 /**
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46 * A request for the incoming argument locations.
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47 */
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48 JavaCallee(false),
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49
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50 /**
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51 * A request for the outgoing argument locations at a call site to the runtime (which may be
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52 * Java or native code).
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53 */
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54 RuntimeCall(true),
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55
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56 /**
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57 * A request for the outgoing argument locations at a call site to external native code that
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58 * complies with the platform ABI.
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59 */
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60 NativeCall(true);
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61
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62 /**
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63 * Determines if this is a request for the outgoing argument locations at a call site.
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64 */
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65 public final boolean out;
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66
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67 public static final Type[] VALUES = values();
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68
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69 private Type(boolean out) {
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70 this.out = out;
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71 }
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72 }
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73
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74 /**
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75 * The amount of stack space (in bytes) required for the stack-based arguments of the call.
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76 */
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77 private final int stackSize;
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78
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79 private final AllocatableValue returnLocation;
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80
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81 /**
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82 * The ordered locations in which the arguments are placed.
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83 */
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84 private final AllocatableValue[] argumentLocations;
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85
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86 /**
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87 * The locations used (and killed) by the call in addition to the arguments.
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88 */
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89 private final AllocatableValue[] temporaryLocations;
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90
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91 /**
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92 * Creates a description of the registers and stack locations used by a call.
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93 *
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94 * @param stackSize amount of stack space (in bytes) required for the stack-based arguments of
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95 * the call
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96 * @param returnLocation the location for the return value or {@link Value#ILLEGAL} if a void
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97 * call
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98 * @param argumentLocations the ordered locations in which the arguments are placed
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99 */
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100 public CallingConvention(int stackSize, AllocatableValue returnLocation, AllocatableValue... argumentLocations) {
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101 this(AllocatableValue.NONE, stackSize, returnLocation, argumentLocations);
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102 }
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103
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104 /**
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105 * Creates a description of the registers and stack locations used by a call.
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106 *
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107 * @param temporaryLocations the locations used (and killed) by the call in addition to
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108 * {@code arguments}
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109 * @param stackSize amount of stack space (in bytes) required for the stack-based arguments of
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110 * the call
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111 * @param returnLocation the location for the return value or {@link Value#ILLEGAL} if a void
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112 * call
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113 * @param argumentLocations the ordered locations in which the arguments are placed
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114 */
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115 public CallingConvention(AllocatableValue[] temporaryLocations, int stackSize, AllocatableValue returnLocation, AllocatableValue... argumentLocations) {
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116 assert argumentLocations != null;
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117 assert temporaryLocations != null;
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118 assert returnLocation != null;
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119 this.argumentLocations = argumentLocations;
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120 this.stackSize = stackSize;
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121 this.returnLocation = returnLocation;
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122 this.temporaryLocations = temporaryLocations;
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123 assert verify();
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124 }
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125
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126 /**
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127 * Gets the location for the return value or {@link Value#ILLEGAL} if a void call.
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128 */
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129 public AllocatableValue getReturn() {
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130 return returnLocation;
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131 }
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132
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133 /**
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134 * Gets the location for the {@code index}'th argument.
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135 */
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136 public AllocatableValue getArgument(int index) {
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137 return argumentLocations[index];
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138 }
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139
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140 /**
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141 * Gets the amount of stack space (in bytes) required for the stack-based arguments of the call.
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142 */
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143 public int getStackSize() {
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144 return stackSize;
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145 }
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146
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147 /**
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148 * Gets the number of locations required for the arguments.
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149 */
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150 public int getArgumentCount() {
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151 return argumentLocations.length;
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152 }
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153
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154 /**
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155 * Gets the locations used (and killed) by the call apart from the
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156 * {@linkplain #getArgument(int) arguments}.
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157 */
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158 public AllocatableValue[] getTemporaries() {
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159 if (temporaryLocations.length == 0) {
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160 return temporaryLocations;
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161 }
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162 return temporaryLocations.clone();
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163 }
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164
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165 @Override
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166 public String toString() {
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167 StringBuilder sb = new StringBuilder();
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168 sb.append("CallingConvention[");
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169 String sep = "";
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170 for (Value op : argumentLocations) {
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171 sb.append(sep).append(op);
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172 sep = ", ";
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173 }
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174 if (returnLocation != Value.ILLEGAL) {
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175 sb.append(" -> ").append(returnLocation);
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176 }
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177 if (temporaryLocations.length != 0) {
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178 sb.append("; temps=");
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179 sep = "";
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180 for (Value op : temporaryLocations) {
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181 sb.append(sep).append(op);
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182 sep = ", ";
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183 }
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184 }
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185 sb.append("]");
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186 return sb.toString();
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187 }
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188
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189 private boolean verify() {
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190 for (int i = 0; i < argumentLocations.length; i++) {
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191 Value location = argumentLocations[i];
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192 assert isStackSlot(location) || isRegister(location);
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193 }
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194 return true;
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195 }
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196 }