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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigAccess.java @ 23686:50465926fbeb jvmci-0.12

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make all HotSpotVMConfigAccess subclasses and their members package-private remove toString methods from HotSpotVMConfigAccess subclasses remove HotSpotVMConfigVerifier
author Doug Simon <doug.simon@oracle.com>
date Wed, 15 Jun 2016 15:29:38 +0200
parents b5557b757040
children 9e1235406b59
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1 /*
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2 * Copyright (c) 2016, 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.hotspot;
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24
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25 import jdk.vm.ci.common.JVMCIError;
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26
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27 /**
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28 * Access to VM configuration data.
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29 */
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30 public class HotSpotVMConfigAccess {
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31
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32 /**
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33 * Gets the address of a C++ symbol.
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34 *
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35 * @param name name of C++ symbol
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36 * @param notPresent if non-null and the symbol is not present then this value is returned
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37 * @return the address of the symbol
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38 * @throws JVMCIError if the symbol is not present and {@code notPresent == null}
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39 */
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40 public long getAddress(String name, Long notPresent) {
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41 Long entry = store.vmAddresses.get(name);
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42 if (entry == null) {
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43 if (notPresent != null) {
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44 return notPresent;
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45 }
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46 throw new JVMCIError("expected VM symbol not found: " + name);
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47 }
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48 return entry;
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49 }
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50
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51 /**
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52 * Gets the address of a C++ symbol.
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53 *
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54 * @param name name of C++ symbol
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55 * @return the address of the symbol
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56 * @throws JVMCIError if the symbol is not present
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57 */
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58 public long getAddress(String name) {
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59 return getAddress(name, null);
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60 }
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61
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62 /**
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63 * Gets the size of a C++ type.
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64 *
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65 * @param name name of the type
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66 * @return the size in bytes of the requested field
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67 * @throws JVMCIError if the field is not present and {@code notPresent} is null
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68 */
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69 public int getTypeSize(String name) {
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70 Long entry = store.vmTypeSizes.get(name);
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71 if (entry == null) {
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72 throw new JVMCIError("expected VM type not found: " + name);
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73 }
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74 return (int) (long) entry;
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75 }
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76
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77 /**
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78 * Gets the value of a C++ constant.
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79 *
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80 * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
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81 * @param type the boxed type to which the constant value will be converted
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82 * @param notPresent if non-null and the constant is not present then this value is returned
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83 * @return the constant value converted to {@code type}
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84 * @throws JVMCIError if the constant is not present and {@code notPresent == null}
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85 */
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86 public <T> T getConstant(String name, Class<T> type, T notPresent) {
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87 Long c = store.vmConstants.get(name);
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88 if (c == null) {
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89 if (notPresent != null) {
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90 return notPresent;
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91 }
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92 throw new JVMCIError("expected VM constant not found: " + name);
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93 }
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94 return type.cast(convertValue(name, type, c, null));
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95 }
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96
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97 /**
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98 * Gets the value of a C++ constant.
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99 *
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100 * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
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101 * @param type the boxed type to which the constant value will be converted
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102 * @return the constant value converted to {@code type}
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103 * @throws JVMCIError if the constant is not present
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104 */
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105 public <T> T getConstant(String name, Class<T> type) {
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106 return getConstant(name, type, null);
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107 }
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108
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109 /**
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110 * Gets the offset of a non-static C++ field.
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111 *
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112 * @param name fully qualified name of the field
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113 * @param type the boxed type to which the offset value will be converted (must be
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114 * {@link Integer} or {@link Long})
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115 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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116 * @param notPresent if non-null and the field is not present then this value is returned
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117 * @return the offset in bytes of the requested field
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118 * @throws JVMCIError if the field is static or not present and {@code notPresent} is null
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119 */
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120 public <T> T getFieldOffset(String name, Class<T> type, String cppType, T notPresent) {
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121 assert type == Integer.class || type == Long.class;
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122 VMField entry = getField(name, cppType, notPresent == null);
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123 if (entry == null) {
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124 return notPresent;
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125 }
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126 if (entry.address != 0) {
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127 throw new JVMCIError("cannot get offset of static field " + name);
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128 }
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129 return entry == null ? notPresent : type.cast(convertValue(name, type, entry.offset, cppType));
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130 }
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131
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132 /**
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133 * Gets the offset of a non-static C++ field.
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134 *
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135 * @param name fully qualified name of the field
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136 * @param type the boxed type to which the offset value will be converted (must be
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137 * {@link Integer} or {@link Long})
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138 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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139 * @return the offset in bytes of the requested field
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140 * @throws JVMCIError if the field is static or not present
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141 */
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142 public <T> T getFieldOffset(String name, Class<T> type, String cppType) {
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143 return getFieldOffset(name, type, cppType, null);
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144 }
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145
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146 /**
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147 * Gets the offset of a non-static C++ field.
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148 *
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149 * @param name fully qualified name of the field
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150 * @param type the boxed type to which the offset value will be converted (must be
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151 * {@link Integer} or {@link Long})
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152 * @return the offset in bytes of the requested field
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153 * @throws JVMCIError if the field is static or not present
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154 */
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155 public <T> T getFieldOffset(String name, Class<T> type) {
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156 return getFieldOffset(name, type, null, null);
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157 }
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158
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159 /**
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160 * Gets the address of a static C++ field.
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161 *
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162 * @param name fully qualified name of the field
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163 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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164 * @param notPresent if non-null and the field is not present then this value is returned
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165 * @return the address of the requested field
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166 * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
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167 */
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168 public long getFieldAddress(String name, String cppType, Long notPresent) {
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169 VMField entry = getField(name, cppType, notPresent == null);
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170 if (entry == null) {
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171 return notPresent;
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172 }
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173 if (entry.address == 0) {
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174 throw new JVMCIError(name + " is not a static field");
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175 }
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176 return entry == null ? notPresent : entry.address;
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177 }
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178
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179 /**
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180 * Gets the address of a static C++ field.
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181 *
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182 * @param name fully qualified name of the field
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183 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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184 * @return the address of the requested field
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185 * @throws JVMCIError if the field is not static or not present
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186 */
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187 public long getFieldAddress(String name, String cppType) {
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188 return getFieldAddress(name, cppType, null);
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189 }
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190
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191 /**
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192 * Gets the value of a static C++ field.
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193 *
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194 * @param name fully qualified name of the field
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195 * @param type the boxed type to which the constant value will be converted
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196 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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197 * @param notPresent if non-null and the field is not present then this value is returned
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198 * @return the value of the requested field
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199 * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
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200 */
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201 public <T> T getFieldValue(String name, Class<T> type, String cppType, T notPresent) {
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202 VMField entry = getField(name, cppType, notPresent == null);
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203 if (entry == null) {
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204 return notPresent;
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205 }
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206 if (entry.value == null) {
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207 throw new JVMCIError(name + " is not a static field");
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208 }
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209 return type.cast(convertValue(name, type, entry.value, cppType));
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210 }
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211
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212 /**
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213 * Gets the value of a static C++ field.
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214 *
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215 * @param name fully qualified name of the field
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216 * @param type the boxed type to which the constant value will be converted
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217 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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218 * @return the value of the requested field
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219 * @throws JVMCIError if the field is not static or not present
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220 */
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221 public <T> T getFieldValue(String name, Class<T> type, String cppType) {
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222 return getFieldValue(name, type, cppType, null);
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223 }
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224
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225 /**
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226 * Gets the value of a static C++ field.
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227 *
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228 * @param name fully qualified name of the field
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229 * @param type the boxed type to which the constant value will be converted
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230 * @return the value of the requested field
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231 * @throws JVMCIError if the field is not static or not present
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232 */
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233 public <T> T getFieldValue(String name, Class<T> type) {
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234 return getFieldValue(name, type, null, null);
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235 }
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236
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237 /**
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238 * Gets a C++ field.
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239 *
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240 * @param name fully qualified name of the field
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241 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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242 * @param required specifies if the field must be present
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243 * @return the field
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244 * @throws JVMCIError if the field is not present and {@code required == true}
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245 */
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246 private VMField getField(String name, String cppType, boolean required) {
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247 VMField entry = store.vmFields.get(name);
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248 if (entry == null) {
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249 if (!required) {
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250 return null;
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251 }
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252 throw new JVMCIError("expected VM field not found: " + name);
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253 }
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254
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255 // Make sure the native type is still the type we expect.
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256 if (cppType != null && !cppType.equals(entry.type)) {
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257 throw new JVMCIError("expected type " + cppType + " but VM field " + name + " is of type " + entry.type);
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258 }
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259 return entry;
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260 }
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261
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262 /**
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263 * Gets a VM flag value.
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264 *
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265 * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
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266 * @param type the boxed type to which the flag's value will be converted
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267 * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
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268 * present
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269 * @throws JVMCIError if the flag is not present
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270 */
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271 public <T> T getFlag(String name, Class<T> type) {
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272 return getFlag(name, type, null);
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273 }
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274
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275 /**
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276 * Gets a VM flag value.
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277 *
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278 * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
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279 * @param type the boxed type to which the flag's value will be converted
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280 * @param notPresent if non-null and the flag is not present then this value is returned
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281 * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
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282 * present
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283 * @throws JVMCIError if the flag is not present and {@code notPresent == null}
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284 */
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285 public <T> T getFlag(String name, Class<T> type, T notPresent) {
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286 VMFlag entry = store.vmFlags.get(name);
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287 if (entry == null) {
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288 if (notPresent != null) {
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289 return notPresent;
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290 }
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291 throw new JVMCIError("expected VM flag not found: " + name);
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292 }
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293 return type.cast(convertValue(name, type, entry.value, entry.type));
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294 }
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295
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296 private static <T> Object convertValue(String name, Class<T> toType, Object value, String cppType) throws JVMCIError {
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297 if (toType == Boolean.class) {
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298 if (value instanceof String) {
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299 return Boolean.valueOf((String) value);
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300 } else if (value instanceof Boolean) {
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301 return value;
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302 } else if (value instanceof Long) {
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303 return ((long) value) != 0;
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304 }
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305 } else if (toType == Byte.class) {
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306 if (value instanceof Long) {
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307 return (byte) (long) value;
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308 }
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309 } else if (toType == Integer.class) {
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310 if (value instanceof Integer) {
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311 return value;
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312 } else if (value instanceof Long) {
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313 return (int) (long) value;
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314 }
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315 } else if (toType == Long.class) {
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316 return (long) value;
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317 }
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318
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319 throw new JVMCIError("cannot convert " + name + " of type " + value.getClass().getSimpleName() + (cppType == null ? "" : " [" + cppType + "]") + " to " + toType.getSimpleName());
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320 }
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321
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322 private final HotSpotVMConfigStore store;
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323
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324 public HotSpotVMConfigAccess(HotSpotVMConfigStore store) {
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325 this.store = store;
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326 }
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327 }