src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigAccess.java
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src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigAccess.java

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   1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.vm.ci.hotspot;
  24 



  25 import jdk.vm.ci.common.JVMCIError;
  26 
  27 /**
  28  * Access to VM configuration data.
  29  */
  30 public class HotSpotVMConfigAccess {
  31 
  32     /**
  33      * Gets the available configuration data.
  34      */
  35     public HotSpotVMConfigStore getStore() {
  36         return store;
  37     }
  38 
  39     /**
  40      * Gets the address of a C++ symbol.
  41      *
  42      * @param name name of C++ symbol
  43      * @param notPresent if non-null and the symbol is not present then this value is returned
  44      * @return the address of the symbol
  45      * @throws JVMCIError if the symbol is not present and {@code notPresent == null}
  46      */
  47     public long getAddress(String name, Long notPresent) {
  48         Long entry = store.vmAddresses.get(name);
  49         if (entry == null) {
  50             if (notPresent != null) {
  51                 return notPresent;
  52             }
  53             store.printConfig();
  54             throw new JVMCIError("expected VM symbol not found in " + store + ": " + name);
  55         }
  56         return entry;
  57     }
  58 
  59     /**
  60      * Gets the address of a C++ symbol.
  61      *
  62      * @param name name of C++ symbol
  63      * @return the address of the symbol
  64      * @throws JVMCIError if the symbol is not present
  65      */
  66     public long getAddress(String name) {
  67         return getAddress(name, null);
  68     }
  69 
  70     /**
  71      * Gets the value of a C++ constant.
  72      *
  73      * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
  74      * @param type the boxed type to which the constant value will be converted
  75      * @param notPresent if non-null and the constant is not present then this value is returned
  76      * @return the constant value converted to {@code type}
  77      * @throws JVMCIError if the constant is not present and {@code notPresent == null}
  78      */
  79     public <T> T getConstant(String name, Class<T> type, T notPresent) {
  80         Long c = store.vmConstants.get(name);
  81         if (c == null) {
  82             if (notPresent != null) {
  83                 return notPresent;
  84             }
  85             store.printConfig();
  86             throw new JVMCIError("expected VM constant not found in " + store + ": " + name);
  87         }
  88         return type.cast(convertValue(name, type, c, null));
  89     }
  90 
  91     /**
  92      * Gets the value of a C++ constant.
  93      *
  94      * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
  95      * @param type the boxed type to which the constant value will be converted
  96      * @return the constant value converted to {@code type}
  97      * @throws JVMCIError if the constant is not present
  98      */
  99     public <T> T getConstant(String name, Class<T> type) {
 100         return getConstant(name, type, null);
 101     }
 102 
 103     /**
 104      * Gets the offset of a non-static C++ field.
 105      *
 106      * @param name fully qualified name of the field
 107      * @param type the boxed type to which the offset value will be converted (must be
 108      *            {@link Integer} or {@link Long})
 109      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 110      * @param notPresent if non-null and the field is not present then this value is returned
 111      * @return the offset in bytes of the requested field
 112      * @throws JVMCIError if the field is static or not present and {@code notPresent} is null
 113      */
 114     public <T> T getFieldOffset(String name, Class<T> type, String cppType, T notPresent) {
 115         assert type == Integer.class || type == Long.class;
 116         VMField entry = getField(name, cppType, notPresent == null);
 117         if (entry == null) {
 118             return notPresent;
 119         }
 120         if (entry.address != 0) {
 121             throw new JVMCIError("cannot get offset of static field " + name);
 122         }
 123         return type.cast(convertValue(name, type, entry.offset, cppType));











 124     }
 125 
 126     /**
 127      * Gets the offset of a non-static C++ field.
 128      *
 129      * @param name fully qualified name of the field
 130      * @param type the boxed type to which the offset value will be converted (must be
 131      *            {@link Integer} or {@link Long})
 132      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 133      * @return the offset in bytes of the requested field
 134      * @throws JVMCIError if the field is static or not present
 135      */
 136     public <T> T getFieldOffset(String name, Class<T> type, String cppType) {
 137         return getFieldOffset(name, type, cppType, null);
 138     }
 139 
 140     /**
 141      * Gets the offset of a non-static C++ field.
 142      *
 143      * @param name fully qualified name of the field
 144      * @param type the boxed type to which the offset value will be converted (must be
 145      *            {@link Integer} or {@link Long})
 146      * @return the offset in bytes of the requested field
 147      * @throws JVMCIError if the field is static or not present
 148      */
 149     public <T> T getFieldOffset(String name, Class<T> type) {
 150         return getFieldOffset(name, type, null, null);















 151     }
 152 
 153     /**
 154      * Gets the address of a static C++ field.
 155      *
 156      * @param name fully qualified name of the field
 157      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 158      * @param notPresent if non-null and the field is not present then this value is returned
 159      * @return the address of the requested field
 160      * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
 161      */
 162     public long getFieldAddress(String name, String cppType, Long notPresent) {
 163         VMField entry = getField(name, cppType, notPresent == null);
 164         if (entry == null) {
 165             return notPresent;
 166         }
 167         if (entry.address == 0) {
 168             throw new JVMCIError(name + " is not a static field");
 169         }
 170         return entry.address;









 171     }
 172 
 173     /**
 174      * Gets the address of a static C++ field.
 175      *
 176      * @param name fully qualified name of the field
 177      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 178      * @return the address of the requested field
 179      * @throws JVMCIError if the field is not static or not present
 180      */
 181     public long getFieldAddress(String name, String cppType) {
 182         return getFieldAddress(name, cppType, null);














 183     }
 184 
 185     /**
 186      * Gets the value of a static C++ field.
 187      *
 188      * @param name fully qualified name of the field
 189      * @param type the boxed type to which the constant value will be converted
 190      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 191      * @param notPresent if non-null and the field is not present then this value is returned
 192      * @return the value of the requested field
 193      * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
 194      */
 195     public <T> T getFieldValue(String name, Class<T> type, String cppType, T notPresent) {
 196         VMField entry = getField(name, cppType, notPresent == null);
 197         if (entry == null) {
 198             return notPresent;
 199         }
 200         if (entry.value == null) {
 201             throw new JVMCIError(name + " is not a static field");
 202         }
 203         return type.cast(convertValue(name, type, entry.value, cppType));
 204     }
 205 
 206     /**
 207      * Gets the value of a static C++ field.
 208      *
 209      * @param name fully qualified name of the field
 210      * @param type the boxed type to which the constant value will be converted
 211      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 212      * @return the value of the requested field
 213      * @throws JVMCIError if the field is not static or not present
 214      */
 215     public <T> T getFieldValue(String name, Class<T> type, String cppType) {
 216         return getFieldValue(name, type, cppType, null);















 217     }
 218 
 219     /**
 220      * Gets the value of a static C++ field.
 221      *
 222      * @param name fully qualified name of the field
 223      * @param type the boxed type to which the constant value will be converted
 224      * @return the value of the requested field
 225      * @throws JVMCIError if the field is not static or not present
 226      */
 227     public <T> T getFieldValue(String name, Class<T> type) {
 228         return getFieldValue(name, type, null, null);














 229     }
 230 
 231     /**
 232      * Gets a C++ field.
 233      *
 234      * @param name fully qualified name of the field
 235      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 236      * @param required specifies if the field must be present
 237      * @return the field
 238      * @throws JVMCIError if the field is not present and {@code required == true}
 239      */
 240     private VMField getField(String name, String cppType, boolean required) {
 241         VMField entry = store.vmFields.get(name);
 242         if (entry == null) {
 243             if (!required) {
 244                 return null;
 245             }
 246             store.printConfig();
 247             throw new JVMCIError("expected VM field not found in " + store + ": " + name);
 248         }
 249 
 250         // Make sure the native type is still the type we expect.
 251         if (cppType != null && !cppType.equals(entry.type)) {
 252             throw new JVMCIError("expected type " + cppType + " but VM field " + name + " is of type " + entry.type);
 253         }
 254         return entry;
 255     }
 256 
 257     /**
 258      * Gets a VM flag value.
 259      *
 260      * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
 261      * @param type the boxed type to which the flag's value will be converted
 262      * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
 263      *         present
 264      * @throws JVMCIError if the flag is not present
 265      */
 266     public <T> T getFlag(String name, Class<T> type) {
 267         return getFlag(name, type, null);


 271      * Gets a VM flag value.
 272      *
 273      * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
 274      * @param type the boxed type to which the flag's value will be converted
 275      * @param notPresent if non-null and the flag is not present then this value is returned
 276      * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
 277      *         present
 278      * @throws JVMCIError if the flag is not present and {@code notPresent == null}
 279      */
 280     public <T> T getFlag(String name, Class<T> type, T notPresent) {
 281         VMFlag entry = store.vmFlags.get(name);
 282         Object value;
 283         String cppType;
 284         if (entry == null) {
 285             // Fall back to VM call
 286             value = store.compilerToVm.getFlagValue(name);
 287             if (value == store.compilerToVm) {
 288                 if (notPresent != null) {
 289                     return notPresent;
 290                 }
 291                 store.printConfig();
 292                 throw new JVMCIError("expected VM flag not found in " + store + ": " + name);
 293             } else {
 294                 cppType = null;
 295             }
 296         } else {
 297             value = entry.value;
 298             cppType = entry.type;
 299         }
 300         return type.cast(convertValue(name, type, value, cppType));
 301     }
 302 





 303     private static <T> Object convertValue(String name, Class<T> toType, Object value, String cppType) throws JVMCIError {
 304         if (toType == Boolean.class) {
 305             if (value instanceof String) {
 306                 return Boolean.valueOf((String) value);
 307             } else if (value instanceof Boolean) {
 308                 return value;
 309             } else if (value instanceof Long) {
 310                 return ((long) value) != 0;
 311             }
 312         } else if (toType == Byte.class) {
 313             if (value instanceof Long) {
 314                 return (byte) (long) value;
 315             }
 316         } else if (toType == Integer.class) {
 317             if (value instanceof Integer) {
 318                 return value;
 319             } else if (value instanceof Long) {
 320                 return (int) (long) value;
 321             }
 322         } else if (toType == String.class) {
   1 /*
   2  * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.vm.ci.hotspot;
  24 
  25 import java.util.Set;
  26 import java.util.stream.Collectors;
  27 
  28 import jdk.vm.ci.common.JVMCIError;
  29 
  30 /**
  31  * Access to VM configuration data.
  32  */
  33 public class HotSpotVMConfigAccess {
  34 
  35     /**
  36      * Gets the available configuration data.
  37      */
  38     public HotSpotVMConfigStore getStore() {
  39         return store;
  40     }
  41 
  42     /**
  43      * Gets the address of a C++ symbol.
  44      *
  45      * @param name name of C++ symbol
  46      * @param notPresent if non-null and the symbol is not present then this value is returned
  47      * @return the address of the symbol
  48      * @throws JVMCIError if the symbol is not present and {@code notPresent == null}
  49      */
  50     public long getAddress(String name, Long notPresent) {
  51         Long entry = store.vmAddresses.get(name);
  52         if (entry == null) {
  53             if (notPresent != null) {
  54                 return notPresent;
  55             }
  56             throw missingEntry("address", name, store.vmFlags.keySet());
  57 
  58         }
  59         return entry;
  60     }
  61 
  62     /**
  63      * Gets the address of a C++ symbol.
  64      *
  65      * @param name name of C++ symbol
  66      * @return the address of the symbol
  67      * @throws JVMCIError if the symbol is not present
  68      */
  69     public long getAddress(String name) {
  70         return getAddress(name, null);
  71     }
  72 
  73     /**
  74      * Gets the value of a C++ constant.
  75      *
  76      * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
  77      * @param type the boxed type to which the constant value will be converted
  78      * @param notPresent if non-null and the constant is not present then this value is returned
  79      * @return the constant value converted to {@code type}
  80      * @throws JVMCIError if the constant is not present and {@code notPresent == null}
  81      */
  82     public <T> T getConstant(String name, Class<T> type, T notPresent) {
  83         Long c = store.vmConstants.get(name);
  84         if (c == null) {
  85             if (notPresent != null) {
  86                 return notPresent;
  87             }
  88             throw missingEntry("constant", name, store.vmConstants.keySet());

  89         }
  90         return type.cast(convertValue(name, type, c, null));
  91     }
  92 
  93     /**
  94      * Gets the value of a C++ constant.
  95      *
  96      * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"})
  97      * @param type the boxed type to which the constant value will be converted
  98      * @return the constant value converted to {@code type}
  99      * @throws JVMCIError if the constant is not present
 100      */
 101     public <T> T getConstant(String name, Class<T> type) {
 102         return getConstant(name, type, null);
 103     }
 104 
 105     /**
 106      * Gets the offset of a non-static C++ field.
 107      *
 108      * @param name fully qualified name of the field
 109      * @param type the boxed type to which the offset value will be converted (must be
 110      *            {@link Integer} or {@link Long})
 111      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 112      * @param notPresent if non-null and the field is not present then this value is returned
 113      * @return the offset in bytes of the requested field
 114      * @throws JVMCIError if the field is static or not present and {@code notPresent} is null
 115      */
 116     public <T> T getFieldOffset(String name, Class<T> type, String cppType, T notPresent) {
 117         return getFieldOffset0(name, type, notPresent, cppType, null);



 118     }
 119 
 120     /**
 121      * Gets the offset of a non-static C++ field.
 122      *
 123      * @param name fully qualified name of the field
 124      * @param type the boxed type to which the offset value will be converted (must be
 125      *            {@link Integer} or {@link Long})
 126      * @param notPresent if non-null and the field is not present then this value is returned
 127      * @param outCppType if non-null, the C++ type of the field (e.g., {@code "HeapWord*"}) is
 128      *            returned in element 0 of this array
 129      * @return the offset in bytes of the requested field
 130      * @throws JVMCIError if the field is static or not present and {@code notPresent} is null
 131      */
 132     public <T> T getFieldOffset(String name, Class<T> type, T notPresent, String[] outCppType) {
 133         return getFieldOffset0(name, type, notPresent, null, outCppType);
 134     }
 135 
 136     /**
 137      * Gets the offset of a non-static C++ field.
 138      *
 139      * @param name fully qualified name of the field
 140      * @param type the boxed type to which the offset value will be converted (must be
 141      *            {@link Integer} or {@link Long})
 142      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 143      * @return the offset in bytes of the requested field
 144      * @throws JVMCIError if the field is static or not present
 145      */
 146     public <T> T getFieldOffset(String name, Class<T> type, String cppType) {
 147         return getFieldOffset0(name, type, null, cppType, null);
 148     }
 149 
 150     /**
 151      * Gets the offset of a non-static C++ field.
 152      *
 153      * @param name fully qualified name of the field
 154      * @param type the boxed type to which the offset value will be converted (must be
 155      *            {@link Integer} or {@link Long})
 156      * @return the offset in bytes of the requested field
 157      * @throws JVMCIError if the field is static or not present
 158      */
 159     public <T> T getFieldOffset(String name, Class<T> type) {
 160         return getFieldOffset0(name, type, null, null, null);
 161     }
 162 
 163     private <T> T getFieldOffset0(String name, Class<T> type, T notPresent, String inCppType, String[] outCppType) {
 164         assert type == Integer.class || type == Long.class;
 165         VMField entry = getField(name, inCppType, notPresent == null);
 166         if (entry == null) {
 167             return notPresent;
 168         }
 169         if (entry.address != 0) {
 170             throw new JVMCIError("cannot get offset of static field " + name);
 171         }
 172         if (outCppType != null) {
 173             outCppType[0] = entry.type;
 174         }
 175         return type.cast(convertValue(name, type, entry.offset, inCppType));
 176     }
 177 
 178     /**
 179      * Gets the address of a static C++ field.
 180      *
 181      * @param name fully qualified name of the field
 182      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 183      * @param notPresent if non-null and the field is not present then this value is returned
 184      * @return the address of the requested field
 185      * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
 186      */
 187     public long getFieldAddress(String name, String cppType, Long notPresent) {
 188         return getFieldAddress0(name, notPresent, cppType, null);


 189     }
 190 
 191     /**
 192      * Gets the address of a static C++ field.
 193      *
 194      * @param name fully qualified name of the field
 195      * @param notPresent if non-null and the field is not present then this value is returned
 196      * @param outCppType if non-null, the C++ type of the field (e.g., {@code "HeapWord*"}) is
 197      *            returned in element 0 of this array
 198      * @return the address of the requested field
 199      * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
 200      */
 201     public long getFieldAddress(String name, Long notPresent, String[] outCppType) {
 202         return getFieldAddress0(name, notPresent, null, outCppType);
 203     }
 204 
 205     /**
 206      * Gets the address of a static C++ field.
 207      *
 208      * @param name fully qualified name of the field
 209      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 210      * @return the address of the requested field
 211      * @throws JVMCIError if the field is not static or not present
 212      */
 213     public long getFieldAddress(String name, String cppType) {
 214         return getFieldAddress0(name, null, cppType, null);
 215     }
 216 
 217     private long getFieldAddress0(String name, Long notPresent, String inCppType, String[] outCppType) {
 218         VMField entry = getField(name, inCppType, notPresent == null);
 219         if (entry == null) {
 220             return notPresent;
 221         }
 222         if (entry.address == 0) {
 223             throw new JVMCIError(name + " is not a static field");
 224         }
 225         if (outCppType != null) {
 226             outCppType[0] = entry.type;
 227         }
 228         return entry.address;
 229     }
 230 
 231     /**
 232      * Gets the value of a static C++ field.
 233      *
 234      * @param name fully qualified name of the field
 235      * @param type the boxed type to which the constant value will be converted
 236      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 237      * @param notPresent if non-null and the field is not present then this value is returned
 238      * @return the value of the requested field
 239      * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
 240      */
 241     public <T> T getFieldValue(String name, Class<T> type, String cppType, T notPresent) {
 242         return getFieldValue0(name, type, notPresent, cppType, null);







 243     }
 244 
 245     /**
 246      * Gets the value of a static C++ field.
 247      *
 248      * @param name fully qualified name of the field
 249      * @param type the boxed type to which the constant value will be converted
 250      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 251      * @return the value of the requested field
 252      * @throws JVMCIError if the field is not static or not present
 253      */
 254     public <T> T getFieldValue(String name, Class<T> type, String cppType) {
 255         return getFieldValue0(name, type, null, cppType, null);
 256     }
 257 
 258     /**
 259      * Gets the value of a static C++ field.
 260      *
 261      * @param name fully qualified name of the field
 262      * @param type the boxed type to which the constant value will be converted
 263      * @param notPresent if non-null and the field is not present then this value is returned
 264      * @param outCppType if non-null, the C++ type of the field (e.g., {@code "HeapWord*"}) is
 265      *            returned in element 0 of this array
 266      * @return the value of the requested field
 267      * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null
 268      */
 269     public <T> T getFieldValue(String name, Class<T> type, T notPresent, String[] outCppType) {
 270         return getFieldValue0(name, type, notPresent, null, outCppType);
 271     }
 272 
 273     /**
 274      * Gets the value of a static C++ field.
 275      *
 276      * @param name fully qualified name of the field
 277      * @param type the boxed type to which the constant value will be converted
 278      * @return the value of the requested field
 279      * @throws JVMCIError if the field is not static or not present
 280      */
 281     public <T> T getFieldValue(String name, Class<T> type) {
 282         return getFieldValue0(name, type, null, null, null);
 283     }
 284 
 285     private <T> T getFieldValue0(String name, Class<T> type, T notPresent, String inCppType, String[] outCppType) {
 286         VMField entry = getField(name, inCppType, notPresent == null);
 287         if (entry == null) {
 288             return notPresent;
 289         }
 290         if (entry.value == null) {
 291             throw new JVMCIError(name + " is not a static field ");
 292         }
 293         if (outCppType != null) {
 294             outCppType[0] = entry.type;
 295         }
 296         return type.cast(convertValue(name, type, entry.value, inCppType));
 297     }
 298 
 299     /**
 300      * Gets a C++ field.
 301      *
 302      * @param name fully qualified name of the field
 303      * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"})
 304      * @param required specifies if the field must be present
 305      * @return the field
 306      * @throws JVMCIError if the field is not present and {@code required == true}
 307      */
 308     private VMField getField(String name, String cppType, boolean required) {
 309         VMField entry = store.vmFields.get(name);
 310         if (entry == null) {
 311             if (!required) {
 312                 return null;
 313             }
 314             throw missingEntry("field", name, store.vmFields.keySet());

 315         }
 316 
 317         // Make sure the native type is still the type we expect.
 318         if (cppType != null && !cppType.equals(entry.type)) {
 319             throw new JVMCIError("expected type " + cppType + " but VM field " + name + " is of type " + entry.type);
 320         }
 321         return entry;
 322     }
 323 
 324     /**
 325      * Gets a VM flag value.
 326      *
 327      * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
 328      * @param type the boxed type to which the flag's value will be converted
 329      * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
 330      *         present
 331      * @throws JVMCIError if the flag is not present
 332      */
 333     public <T> T getFlag(String name, Class<T> type) {
 334         return getFlag(name, type, null);


 338      * Gets a VM flag value.
 339      *
 340      * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"})
 341      * @param type the boxed type to which the flag's value will be converted
 342      * @param notPresent if non-null and the flag is not present then this value is returned
 343      * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not
 344      *         present
 345      * @throws JVMCIError if the flag is not present and {@code notPresent == null}
 346      */
 347     public <T> T getFlag(String name, Class<T> type, T notPresent) {
 348         VMFlag entry = store.vmFlags.get(name);
 349         Object value;
 350         String cppType;
 351         if (entry == null) {
 352             // Fall back to VM call
 353             value = store.compilerToVm.getFlagValue(name);
 354             if (value == store.compilerToVm) {
 355                 if (notPresent != null) {
 356                     return notPresent;
 357                 }
 358                 throw missingEntry("flag", name, store.vmFlags.keySet());

 359             } else {
 360                 cppType = null;
 361             }
 362         } else {
 363             value = entry.value;
 364             cppType = entry.type;
 365         }
 366         return type.cast(convertValue(name, type, value, cppType));
 367     }
 368 
 369     private JVMCIError missingEntry(String category, String name, Set<String> keys) {
 370         throw new JVMCIError("expected VM %s not found in %s: %s%nAvailable values:%n    %s", category, store, name,
 371                         keys.stream().sorted().collect(Collectors.joining(System.lineSeparator() + "    ")));
 372     }
 373 
 374     private static <T> Object convertValue(String name, Class<T> toType, Object value, String cppType) throws JVMCIError {
 375         if (toType == Boolean.class) {
 376             if (value instanceof String) {
 377                 return Boolean.valueOf((String) value);
 378             } else if (value instanceof Boolean) {
 379                 return value;
 380             } else if (value instanceof Long) {
 381                 return ((long) value) != 0;
 382             }
 383         } else if (toType == Byte.class) {
 384             if (value instanceof Long) {
 385                 return (byte) (long) value;
 386             }
 387         } else if (toType == Integer.class) {
 388             if (value instanceof Integer) {
 389                 return value;
 390             } else if (value instanceof Long) {
 391                 return (int) (long) value;
 392             }
 393         } else if (toType == String.class) {
src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigAccess.java
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