Refactor access to VM options and move some VM options to oal.util.Constants (#12754)

lucene/CHANGES.txt

@@ -210,6 +210,9 @@ Improvements
 
 * GITHUB#12689: TaskExecutor to cancel all tasks on exception to avoid needless computation. (Luca Cavanna)
 
+* GITHUB#12754: Refactor lookup of Hotspot VM options and do not initialize constants with NULL
+  if SecurityManager prevents access.  (Uwe Schindler)
+
 Optimizations
 ---------------------
 * GITHUB#12183: Make TermStates#build concurrent. (Shubham Chaudhary)

lucene/core/src/java/org/apache/lucene/internal/vectorization/VectorizationProvider.java

@@ -21,8 +21,6 @@ import java.lang.Runtime.Version;
 import java.lang.StackWalker.StackFrame;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
-import java.security.AccessController;
-import java.security.PrivilegedAction;
 import java.util.Locale;
 import java.util.Objects;
 import java.util.Optional;
@@ -31,7 +29,7 @@ import java.util.Set;
 import java.util.function.Predicate;
 import java.util.logging.Logger;
 import java.util.stream.Stream;
-import org.apache.lucene.util.SuppressForbidden;
+import org.apache.lucene.util.Constants;
 import org.apache.lucene.util.VectorUtil;
 
 /**
@@ -129,7 +127,7 @@ public abstract class VectorizationProvider {
               "Vector bitsize and/or integer vectors enforcement; using default vectorization provider outside of testMode");
           return new DefaultVectorizationProvider();
         }
-        if (isClientVM()) {
+        if (Constants.IS_CLIENT_VM) {
           LOG.warning("C2 compiler is disabled; Java vector incubator API can't be enabled");
           return new DefaultVectorizationProvider();
         }
@@ -188,23 +186,6 @@ public abstract class VectorizationProvider {
         && !Objects.equals("I", "i".toUpperCase(Locale.getDefault()));
   }
 
-  @SuppressWarnings("removal")
-  @SuppressForbidden(reason = "security manager")
-  private static boolean isClientVM() {
-    try {
-      final PrivilegedAction<Boolean> action =
-          () -> System.getProperty("java.vm.info", "").contains("emulated-client");
-      return AccessController.doPrivileged(action);
-    } catch (
-        @SuppressWarnings("unused")
-        SecurityException e) {
-      LOG.warning(
-          "SecurityManager denies permission to 'java.vm.info' system property, so state of C2 compiler can't be detected. "
-              + "In case of performance issues allow access to this property.");
-      return false;
-    }
-  }
-
   // add all possible callers here as FQCN:
   private static final Set<String> VALID_CALLERS = Set.of("org.apache.lucene.util.VectorUtil");
 

lucene/core/src/java/org/apache/lucene/util/Constants.java

@@ -16,18 +16,25 @@
  */
 package org.apache.lucene.util;
 
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Objects;
+import java.util.logging.Logger;
+
 /** Some useful constants. */
 public final class Constants {
   private Constants() {} // can't construct
 
+  private static final String UNKNOWN = "Unknown";
+
   /** JVM vendor info. */
-  public static final String JVM_VENDOR = System.getProperty("java.vm.vendor");
+  public static final String JVM_VENDOR = getSysProp("java.vm.vendor", UNKNOWN);
 
   /** JVM vendor name. */
-  public static final String JVM_NAME = System.getProperty("java.vm.name");
+  public static final String JVM_NAME = getSysProp("java.vm.name", UNKNOWN);
 
   /** The value of <code>System.getProperty("os.name")</code>. * */
-  public static final String OS_NAME = System.getProperty("os.name");
+  public static final String OS_NAME = getSysProp("os.name", UNKNOWN);
 
   /** True iff running on Linux. */
   public static final boolean LINUX = OS_NAME.startsWith("Linux");
@@ -45,36 +52,67 @@ public final class Constants {
   public static final boolean FREE_BSD = OS_NAME.startsWith("FreeBSD");
 
   /** The value of <code>System.getProperty("os.arch")</code>. */
-  public static final String OS_ARCH = System.getProperty("os.arch");
+  public static final String OS_ARCH = getSysProp("os.arch", UNKNOWN);
 
   /** The value of <code>System.getProperty("os.version")</code>. */
-  public static final String OS_VERSION = System.getProperty("os.version");
+  public static final String OS_VERSION = getSysProp("os.version", UNKNOWN);
 
   /** The value of <code>System.getProperty("java.vendor")</code>. */
-  public static final String JAVA_VENDOR = System.getProperty("java.vendor");
+  public static final String JAVA_VENDOR = getSysProp("java.vendor", UNKNOWN);
+
+  /** True iff the Java runtime is a client runtime and C2 compiler is not enabled */
+  public static final boolean IS_CLIENT_VM =
+      getSysProp("java.vm.info", "").contains("emulated-client");
 
   /** True iff running on a 64bit JVM */
-  public static final boolean JRE_IS_64BIT;
+  public static final boolean JRE_IS_64BIT = is64Bit();
 
-  static {
+  /** true iff we know fast FMA is supported, to deliver less error */
-    boolean is64Bit = false;
+  public static final boolean HAS_FAST_FMA =
-    String datamodel = null;
+      (IS_CLIENT_VM == false)
+          && Objects.equals(OS_ARCH, "amd64")
+          && HotspotVMOptions.get("UseFMA").map(Boolean::valueOf).orElse(false);
+
+  private static boolean is64Bit() {
+    final String datamodel = getSysProp("sun.arch.data.model");
+    if (datamodel != null) {
+      return datamodel.contains("64");
+    } else {
+      return (OS_ARCH != null && OS_ARCH.contains("64"));
+    }
+  }
+
+  private static String getSysProp(String property) {
     try {
-      datamodel = System.getProperty("sun.arch.data.model");
+      return doPrivileged(() -> System.getProperty(property));
-      if (datamodel != null) {
-        is64Bit = datamodel.contains("64");
-      }
     } catch (
         @SuppressWarnings("unused")
-        SecurityException ex) {
+        SecurityException se) {
+      logSecurityWarning(property);
+      return null;
     }
-    if (datamodel == null) {
+  }
-      if (OS_ARCH != null && OS_ARCH.contains("64")) {
+
-        is64Bit = true;
+  private static String getSysProp(String property, String def) {
-      } else {
+    try {
-        is64Bit = false;
+      return doPrivileged(() -> System.getProperty(property, def));
-      }
+    } catch (
+        @SuppressWarnings("unused")
+        SecurityException se) {
+      logSecurityWarning(property);
+      return def;
     }
-    JRE_IS_64BIT = is64Bit;
+  }
+
+  private static void logSecurityWarning(String property) {
+    var log = Logger.getLogger(Constants.class.getName());
+    log.warning("SecurityManager prevented access to system property: " + property);
+  }
+
+  // Extracted to a method to be able to apply the SuppressForbidden annotation
+  @SuppressWarnings("removal")
+  @SuppressForbidden(reason = "security manager")
+  private static <T> T doPrivileged(PrivilegedAction<T> action) {
+    return AccessController.doPrivileged(action);
   }
 }

lucene/core/src/java/org/apache/lucene/util/HotspotVMOptions.java

@@ -0,0 +1,90 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.lucene.util;
+
+import java.lang.reflect.Method;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.logging.Logger;
+
+/** Accessor to get Hotspot VM Options (if available). */
+final class HotspotVMOptions {
+  private HotspotVMOptions() {} // can't construct
+
+  /** True if the Java VM is based on Hotspot and has the Hotspot MX bean readable by Lucene */
+  public static final boolean IS_HOTSPOT;
+
+  /**
+   * Returns an optional with the value of a Hotspot VM option. If the VM option does not exist or
+   * is not readable, returns an empty optional.
+   */
+  public static Optional<String> get(String name) {
+    return ACCESSOR.apply(Objects.requireNonNull(name, "name"));
+  }
+
+  private static final String MANAGEMENT_FACTORY_CLASS = "java.lang.management.ManagementFactory";
+  private static final String HOTSPOT_BEAN_CLASS = "com.sun.management.HotSpotDiagnosticMXBean";
+  private static final Function<String, Optional<String>> ACCESSOR;
+
+  static {
+    boolean isHotspot = false;
+    Function<String, Optional<String>> accessor = name -> Optional.empty();
+    try {
+      final Class<?> beanClazz = Class.forName(HOTSPOT_BEAN_CLASS);
+      // we use reflection for this, because the management factory is not part
+      // of java.base module:
+      final Object hotSpotBean =
+          Class.forName(MANAGEMENT_FACTORY_CLASS)
+              .getMethod("getPlatformMXBean", Class.class)
+              .invoke(null, beanClazz);
+      if (hotSpotBean != null) {
+        final Method getVMOptionMethod = beanClazz.getMethod("getVMOption", String.class);
+        final Method getValueMethod = getVMOptionMethod.getReturnType().getMethod("getValue");
+        isHotspot = true;
+        accessor =
+            name -> {
+              try {
+                final Object vmOption = getVMOptionMethod.invoke(hotSpotBean, name);
+                return Optional.of(getValueMethod.invoke(vmOption).toString());
+              } catch (@SuppressWarnings("unused")
+                  ReflectiveOperationException
+                  | RuntimeException e) {
+                return Optional.empty();
+              }
+            };
+      }
+    } catch (@SuppressWarnings("unused") ReflectiveOperationException | RuntimeException e) {
+      isHotspot = false;
+      final Logger log = Logger.getLogger(HotspotVMOptions.class.getName());
+      final Module module = HotspotVMOptions.class.getModule();
+      final ModuleLayer layer = module.getLayer();
+      // classpath / unnamed module has no layer, so we need to check:
+      if (layer != null
+          && layer.findModule("jdk.management").map(module::canRead).orElse(false) == false) {
+        log.warning(
+            "Lucene cannot access JVM internals to optimize algorithms or calculate object sizes, unless the 'jdk.management' Java module "
+                + "is readable [please add 'jdk.management' to modular application either by command line or its module descriptor].");
+      } else {
+        log.warning(
+            "Lucene cannot optimize algorithms or calculate object sizes for JVMs that are not based on Hotspot or a compatible implementation.");
+      }
+    }
+    IS_HOTSPOT = isHotspot;
+    ACCESSOR = accessor;
+  }
+}

lucene/core/src/java/org/apache/lucene/util/RamUsageEstimator.java

@@ -18,7 +18,6 @@ package org.apache.lucene.util;
 
 import java.lang.reflect.Array;
 import java.lang.reflect.Field;
-import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.security.AccessControlException;
 import java.security.AccessController;
@@ -30,7 +29,6 @@ import java.util.Collections;
 import java.util.IdentityHashMap;
 import java.util.Locale;
 import java.util.Map;
-import java.util.logging.Logger;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.search.BooleanClause;
 import org.apache.lucene.search.Query;
@@ -112,64 +110,16 @@ public final class RamUsageEstimator {
   /** For testing only */
   static final boolean JVM_IS_HOTSPOT_64BIT;
 
-  static final String MANAGEMENT_FACTORY_CLASS = "java.lang.management.ManagementFactory";
-  static final String HOTSPOT_BEAN_CLASS = "com.sun.management.HotSpotDiagnosticMXBean";
-
   /** Initialize constants and try to collect information about the JVM internals. */
   static {
-    if (Constants.JRE_IS_64BIT) {
+    if (Constants.JRE_IS_64BIT && HotspotVMOptions.IS_HOTSPOT) {
       // Try to get compressed oops and object alignment (the default seems to be 8 on Hotspot);
       // (this only works on 64 bit, on 32 bits the alignment and reference size is fixed):
-      boolean compressedOops = false;
+      JVM_IS_HOTSPOT_64BIT = true;
-      int objectAlignment = 8;
+      COMPRESSED_REFS_ENABLED =
-      boolean isHotspot = false;
+          HotspotVMOptions.get("UseCompressedOops").map(Boolean::valueOf).orElse(false);
-      try {
+      NUM_BYTES_OBJECT_ALIGNMENT =
-        final Class<?> beanClazz = Class.forName(HOTSPOT_BEAN_CLASS);
+          HotspotVMOptions.get("ObjectAlignmentInBytes").map(Integer::valueOf).orElse(8);
-        // we use reflection for this, because the management factory is not part
-        // of Java 8's compact profile:
-        final Object hotSpotBean =
-            Class.forName(MANAGEMENT_FACTORY_CLASS)
-                .getMethod("getPlatformMXBean", Class.class)
-                .invoke(null, beanClazz);
-        if (hotSpotBean != null) {
-          isHotspot = true;
-          final Method getVMOptionMethod = beanClazz.getMethod("getVMOption", String.class);
-          try {
-            final Object vmOption = getVMOptionMethod.invoke(hotSpotBean, "UseCompressedOops");
-            compressedOops =
-                Boolean.parseBoolean(
-                    vmOption.getClass().getMethod("getValue").invoke(vmOption).toString());
-          } catch (@SuppressWarnings("unused") ReflectiveOperationException | RuntimeException e) {
-            isHotspot = false;
-          }
-          try {
-            final Object vmOption = getVMOptionMethod.invoke(hotSpotBean, "ObjectAlignmentInBytes");
-            objectAlignment =
-                Integer.parseInt(
-                    vmOption.getClass().getMethod("getValue").invoke(vmOption).toString());
-          } catch (@SuppressWarnings("unused") ReflectiveOperationException | RuntimeException e) {
-            isHotspot = false;
-          }
-        }
-      } catch (@SuppressWarnings("unused") ReflectiveOperationException | RuntimeException e) {
-        isHotspot = false;
-        final Logger log = Logger.getLogger(RamUsageEstimator.class.getName());
-        final Module module = RamUsageEstimator.class.getModule();
-        final ModuleLayer layer = module.getLayer();
-        // classpath / unnamed module has no layer, so we need to check:
-        if (layer != null
-            && layer.findModule("jdk.management").map(module::canRead).orElse(false) == false) {
-          log.warning(
-              "Lucene cannot correctly calculate object sizes on 64bit JVMs, unless the 'jdk.management' Java module "
-                  + "is readable [please add 'jdk.management' to modular application either by command line or its module descriptor]");
-        } else {
-          log.warning(
-              "Lucene cannot correctly calculate object sizes on 64bit JVMs that are not based on Hotspot or a compatible implementation.");
-        }
-      }
-      JVM_IS_HOTSPOT_64BIT = isHotspot;
-      COMPRESSED_REFS_ENABLED = compressedOops;
-      NUM_BYTES_OBJECT_ALIGNMENT = objectAlignment;
       // reference size is 4, if we have compressed oops:
       NUM_BYTES_OBJECT_REF = COMPRESSED_REFS_ENABLED ? 4 : 8;
       // "best guess" based on reference size:

lucene/core/src/java20/org/apache/lucene/internal/vectorization/PanamaVectorUtilSupport.java

@@ -77,41 +77,9 @@ final class PanamaVectorUtilSupport implements VectorUtilSupport {
         VectorizationProvider.TESTS_FORCE_INTEGER_VECTORS || (isAMD64withoutAVX2 == false);
   }
 
-  private static final String MANAGEMENT_FACTORY_CLASS = "java.lang.management.ManagementFactory";
-  private static final String HOTSPOT_BEAN_CLASS = "com.sun.management.HotSpotDiagnosticMXBean";
-
-  // best effort to see if FMA is fast (this is architecture-independent option)
-  private static boolean hasFastFMA() {
-    // on ARM cpus, FMA works fine but is a slight slowdown: don't use it.
-    if (Constants.OS_ARCH.equals("amd64") == false) {
-      return false;
-    }
-    try {
-      final Class<?> beanClazz = Class.forName(HOTSPOT_BEAN_CLASS);
-      // we use reflection for this, because the management factory is not part
-      // of Java 8's compact profile:
-      final Object hotSpotBean =
-          Class.forName(MANAGEMENT_FACTORY_CLASS)
-              .getMethod("getPlatformMXBean", Class.class)
-              .invoke(null, beanClazz);
-      if (hotSpotBean != null) {
-        final var getVMOptionMethod = beanClazz.getMethod("getVMOption", String.class);
-        final Object vmOption = getVMOptionMethod.invoke(hotSpotBean, "UseFMA");
-        return Boolean.parseBoolean(
-            vmOption.getClass().getMethod("getValue").invoke(vmOption).toString());
-      }
-      return false;
-    } catch (@SuppressWarnings("unused") ReflectiveOperationException | RuntimeException e) {
-      return false;
-    }
-  }
-
-  // true if we know FMA is supported, to deliver less error
-  static final boolean HAS_FAST_FMA = hasFastFMA();
-
   // the way FMA should work! if available use it, otherwise fall back to mul/add
   private static FloatVector fma(FloatVector a, FloatVector b, FloatVector c) {
-    if (HAS_FAST_FMA) {
+    if (Constants.HAS_FAST_FMA) {
       return a.fma(b, c);
     } else {
       return a.mul(b).add(c);

lucene/core/src/java20/org/apache/lucene/internal/vectorization/PanamaVectorizationProvider.java

@@ -21,6 +21,7 @@ import java.security.PrivilegedAction;
 import java.util.Locale;
 import java.util.logging.Logger;
 import jdk.incubator.vector.FloatVector;
+import org.apache.lucene.util.Constants;
 import org.apache.lucene.util.SuppressForbidden;
 
 /** A vectorization provider that leverages the Panama Vector API. */
@@ -62,7 +63,7 @@ final class PanamaVectorizationProvider extends VectorizationProvider {
             Locale.ENGLISH,
             "Java vector incubator API enabled; uses preferredBitSize=%d%s%s",
             PanamaVectorUtilSupport.VECTOR_BITSIZE,
-            PanamaVectorUtilSupport.HAS_FAST_FMA ? "; FMA enabled" : "",
+            Constants.HAS_FAST_FMA ? "; FMA enabled" : "",
             PanamaVectorUtilSupport.HAS_FAST_INTEGER_VECTORS
                 ? ""
                 : "; floating-point vectors only"));