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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigAccess.java @ 24127:6d70d9c43369

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added ResolvedJavaType.isPlatformType (JDK-8177845)
author Doug Simon <doug.simon@oracle.com>
date Sat, 15 Apr 2017 23:54:19 +0200
parents 11f0412408cd
children
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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 available configuration data.
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34 */
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35 public HotSpotVMConfigStore getStore() {
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36 return store;
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37 }
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38
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39 /**
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40 * Gets the address of a C++ symbol.
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41 *
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42 * @param name name of C++ symbol
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43 * @param notPresent if non-null and the symbol is not present then this value is returned
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44 * @return the address of the symbol
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45 * @throws JVMCIError if the symbol is not present and {@code notPresent == null}
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46 */
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47 public long getAddress(String name, Long notPresent) {
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48 Long entry = store.vmAddresses.get(name);
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49 if (entry == null) {
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50 if (notPresent != null) {
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51 return notPresent;
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52 }
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53 throw new JVMCIError("expected VM symbol not found: " + name);
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54 }
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55 return entry;
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56 }
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57
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58 /**
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59 * Gets the address of a C++ symbol.
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60 *
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61 * @param name name of C++ symbol
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62 * @return the address of the symbol
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63 * @throws JVMCIError if the symbol is not present
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64 */
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65 public long getAddress(String name) {
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66 return getAddress(name, null);
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67 }
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68
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69 /**
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70 * Gets the value of a C++ constant.
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71 *
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72 * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
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73 * @param type the boxed type to which the constant value will be converted
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74 * @param notPresent if non-null and the constant is not present then this value is returned
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75 * @return the constant value converted to {@code type}
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76 * @throws JVMCIError if the constant is not present and {@code notPresent == null}
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77 */
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78 public <T> T getConstant(String name, Class<T> type, T notPresent) {
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79 Long c = store.vmConstants.get(name);
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80 if (c == null) {
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81 if (notPresent != null) {
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82 return notPresent;
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83 }
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84 throw new JVMCIError("expected VM constant not found: " + name);
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85 }
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86 return type.cast(convertValue(name, type, c, null));
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87 }
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88
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89 /**
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90 * Gets the value of a C++ constant.
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91 *
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92 * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
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93 * @param type the boxed type to which the constant value will be converted
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94 * @return the constant value converted to {@code type}
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95 * @throws JVMCIError if the constant is not present
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96 */
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97 public <T> T getConstant(String name, Class<T> type) {
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98 return getConstant(name, type, null);
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99 }
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100
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101 /**
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102 * Gets the offset of a non-static C++ field.
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103 *
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104 * @param name fully qualified name of the field
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105 * @param type the boxed type to which the offset value will be converted (must be
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106 * {@link Integer} or {@link Long})
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107 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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108 * @param notPresent if non-null and the field is not present then this value is returned
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109 * @return the offset in bytes of the requested field
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110 * @throws JVMCIError if the field is static or not present and {@code notPresent} is null
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111 */
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112 public <T> T getFieldOffset(String name, Class<T> type, String cppType, T notPresent) {
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113 assert type == Integer.class || type == Long.class;
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114 VMField entry = getField(name, cppType, notPresent == null);
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115 if (entry == null) {
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116 return notPresent;
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117 }
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118 if (entry.address != 0) {
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119 throw new JVMCIError("cannot get offset of static field " + name);
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120 }
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121 return type.cast(convertValue(name, type, entry.offset, cppType));
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122 }
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123
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124 /**
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125 * Gets the offset of a non-static C++ field.
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126 *
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127 * @param name fully qualified name of the field
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128 * @param type the boxed type to which the offset value will be converted (must be
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129 * {@link Integer} or {@link Long})
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130 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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131 * @return the offset in bytes of the requested field
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132 * @throws JVMCIError if the field is static or not present
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133 */
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134 public <T> T getFieldOffset(String name, Class<T> type, String cppType) {
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135 return getFieldOffset(name, type, cppType, null);
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136 }
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137
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138 /**
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139 * Gets the offset of a non-static C++ field.
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140 *
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141 * @param name fully qualified name of the field
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142 * @param type the boxed type to which the offset value will be converted (must be
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143 * {@link Integer} or {@link Long})
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144 * @return the offset in bytes of the requested field
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145 * @throws JVMCIError if the field is static or not present
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146 */
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147 public <T> T getFieldOffset(String name, Class<T> type) {
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148 return getFieldOffset(name, type, null, null);
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149 }
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150
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151 /**
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152 * Gets the address of a static C++ field.
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153 *
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154 * @param name fully qualified name of the field
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155 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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156 * @param notPresent if non-null and the field is not present then this value is returned
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157 * @return the address of the requested field
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158 * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
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159 */
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160 public long getFieldAddress(String name, String cppType, Long notPresent) {
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161 VMField entry = getField(name, cppType, notPresent == null);
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162 if (entry == null) {
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163 return notPresent;
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164 }
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165 if (entry.address == 0) {
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166 throw new JVMCIError(name + " is not a static field");
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167 }
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168 return entry.address;
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169 }
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170
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171 /**
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172 * Gets the address of a static C++ field.
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173 *
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174 * @param name fully qualified name of the field
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175 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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176 * @return the address of the requested field
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177 * @throws JVMCIError if the field is not static or not present
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178 */
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179 public long getFieldAddress(String name, String cppType) {
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180 return getFieldAddress(name, cppType, null);
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181 }
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182
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183 /**
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184 * Gets the value of a static C++ field.
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185 *
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186 * @param name fully qualified name of the field
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187 * @param type the boxed type to which the constant value will be converted
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188 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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189 * @param notPresent if non-null and the field is not present then this value is returned
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190 * @return the value of the requested field
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191 * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
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192 */
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193 public <T> T getFieldValue(String name, Class<T> type, String cppType, T notPresent) {
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194 VMField entry = getField(name, cppType, notPresent == null);
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195 if (entry == null) {
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196 return notPresent;
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197 }
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198 if (entry.value == null) {
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199 throw new JVMCIError(name + " is not a static field");
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200 }
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201 return type.cast(convertValue(name, type, entry.value, cppType));
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202 }
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203
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204 /**
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205 * Gets the value of a static C++ field.
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206 *
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207 * @param name fully qualified name of the field
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208 * @param type the boxed type to which the constant value will be converted
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209 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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210 * @return the value of the requested field
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211 * @throws JVMCIError if the field is not static or not present
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212 */
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213 public <T> T getFieldValue(String name, Class<T> type, String cppType) {
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214 return getFieldValue(name, type, cppType, null);
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215 }
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216
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217 /**
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218 * Gets the value of a static C++ field.
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219 *
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220 * @param name fully qualified name of the field
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221 * @param type the boxed type to which the constant value will be converted
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222 * @return the value of the requested field
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223 * @throws JVMCIError if the field is not static or not present
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224 */
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225 public <T> T getFieldValue(String name, Class<T> type) {
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226 return getFieldValue(name, type, null, null);
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227 }
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228
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229 /**
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230 * Gets a C++ field.
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231 *
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232 * @param name fully qualified name of the field
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233 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
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234 * @param required specifies if the field must be present
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235 * @return the field
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236 * @throws JVMCIError if the field is not present and {@code required == true}
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237 */
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238 private VMField getField(String name, String cppType, boolean required) {
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239 VMField entry = store.vmFields.get(name);
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240 if (entry == null) {
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241 if (!required) {
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242 return null;
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243 }
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244 throw new JVMCIError("expected VM field not found: " + name);
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245 }
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246
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247 // Make sure the native type is still the type we expect.
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248 if (cppType != null && !cppType.equals(entry.type)) {
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249 throw new JVMCIError("expected type " + cppType + " but VM field " + name + " is of type " + entry.type);
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250 }
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251 return entry;
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252 }
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253
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254 /**
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255 * Gets a VM flag value.
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256 *
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257 * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
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258 * @param type the boxed type to which the flag's value will be converted
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259 * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
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260 * present
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261 * @throws JVMCIError if the flag is not present
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262 */
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263 public <T> T getFlag(String name, Class<T> type) {
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264 return getFlag(name, type, null);
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265 }
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266
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267 /**
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268 * Gets a VM flag value.
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269 *
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270 * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
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271 * @param type the boxed type to which the flag's value will be converted
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272 * @param notPresent if non-null and the flag is not present then this value is returned
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273 * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
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274 * present
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275 * @throws JVMCIError if the flag is not present and {@code notPresent == null}
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276 */
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277 public <T> T getFlag(String name, Class<T> type, T notPresent) {
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278 VMFlag entry = store.vmFlags.get(name);
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279 Object value;
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280 String cppType;
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281 if (entry == null) {
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282 // Fall back to VM call
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283 value = store.compilerToVm.getFlagValue(name);
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284 if (value == store.compilerToVm) {
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285 if (notPresent != null) {
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286 return notPresent;
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287 }
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288 throw new JVMCIError("expected VM flag not found: " + name);
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289 } else {
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290 cppType = null;
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291 }
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292 } else {
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293 value = entry.value;
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294 cppType = entry.type;
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295 }
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296 return type.cast(convertValue(name, type, value, cppType));
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297 }
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298
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299 private static <T> Object convertValue(String name, Class<T> toType, Object value, String cppType) throws JVMCIError {
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300 if (toType == Boolean.class) {
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301 if (value instanceof String) {
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302 return Boolean.valueOf((String) value);
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303 } else if (value instanceof Boolean) {
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304 return value;
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305 } else if (value instanceof Long) {
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306 return ((long) value) != 0;
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307 }
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308 } else if (toType == Byte.class) {
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309 if (value instanceof Long) {
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310 return (byte) (long) value;
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311 }
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312 } else if (toType == Integer.class) {
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313 if (value instanceof Integer) {
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314 return value;
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315 } else if (value instanceof Long) {
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316 return (int) (long) value;
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317 }
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318 } else if (toType == String.class) {
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319 if (value == null || value instanceof String) {
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320 return value;
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321 }
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322 } else if (toType == Long.class) {
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323 return value;
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324 }
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325
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326 throw new JVMCIError("cannot convert " + name + " of type " + value.getClass().getSimpleName() + (cppType == null ? "" : " [" + cppType + "]") + " to " + toType.getSimpleName());
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327 }
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328
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329 private final HotSpotVMConfigStore store;
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330
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331 public HotSpotVMConfigAccess(HotSpotVMConfigStore store) {
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332 this.store = store;
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333 }
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334 }