JDK 17 java.base.jmod - Base Module
JDK 17 java.base.jmod is the JMOD file for JDK 17 Base module.
JDK 17 Base module compiled class files are stored in \fyicenter\jdk-17.0.5\jmods\java.base.jmod.
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JDK 17 Base module source code files are stored in \fyicenter\jdk-17.0.5\lib\src.zip\java.base.
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⏎ java/lang/runtime/ObjectMethods.java
/*
* Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.lang.runtime;
import java.lang.invoke.ConstantCallSite;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.TypeDescriptor;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Objects;
/**
* Bootstrap methods for state-driven implementations of core methods,
* including {@link Object#equals(Object)}, {@link Object#hashCode()}, and
* {@link Object#toString()}. These methods may be used, for example, by
* Java compiler implementations to implement the bodies of {@link Object}
* methods for record classes.
*
* @since 16
*/
public class ObjectMethods {
private ObjectMethods() { }
private static final MethodType DESCRIPTOR_MT = MethodType.methodType(MethodType.class);
private static final MethodType NAMES_MT = MethodType.methodType(List.class);
private static final MethodHandle FALSE = MethodHandles.constant(boolean.class, false);
private static final MethodHandle TRUE = MethodHandles.constant(boolean.class, true);
private static final MethodHandle ZERO = MethodHandles.constant(int.class, 0);
private static final MethodHandle CLASS_IS_INSTANCE;
private static final MethodHandle OBJECT_EQUALS;
private static final MethodHandle OBJECTS_EQUALS;
private static final MethodHandle OBJECTS_HASHCODE;
private static final MethodHandle OBJECTS_TOSTRING;
private static final MethodHandle OBJECT_EQ;
private static final MethodHandle OBJECT_HASHCODE;
private static final MethodHandle OBJECT_TO_STRING;
private static final MethodHandle STRING_FORMAT;
private static final MethodHandle HASH_COMBINER;
private static final HashMap<Class<?>, MethodHandle> primitiveEquals = new HashMap<>();
private static final HashMap<Class<?>, MethodHandle> primitiveHashers = new HashMap<>();
private static final HashMap<Class<?>, MethodHandle> primitiveToString = new HashMap<>();
static {
try {
Class<ObjectMethods> OBJECT_METHODS_CLASS = ObjectMethods.class;
MethodHandles.Lookup publicLookup = MethodHandles.publicLookup();
MethodHandles.Lookup lookup = MethodHandles.lookup();
@SuppressWarnings("removal")
ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
@Override public ClassLoader run() { return ClassLoader.getPlatformClassLoader(); }
});
CLASS_IS_INSTANCE = publicLookup.findVirtual(Class.class, "isInstance",
MethodType.methodType(boolean.class, Object.class));
OBJECT_EQUALS = publicLookup.findVirtual(Object.class, "equals",
MethodType.methodType(boolean.class, Object.class));
OBJECT_HASHCODE = publicLookup.findVirtual(Object.class, "hashCode",
MethodType.fromMethodDescriptorString("()I", loader));
OBJECT_TO_STRING = publicLookup.findVirtual(Object.class, "toString",
MethodType.methodType(String.class));
STRING_FORMAT = publicLookup.findStatic(String.class, "format",
MethodType.methodType(String.class, String.class, Object[].class));
OBJECTS_EQUALS = publicLookup.findStatic(Objects.class, "equals",
MethodType.methodType(boolean.class, Object.class, Object.class));
OBJECTS_HASHCODE = publicLookup.findStatic(Objects.class, "hashCode",
MethodType.methodType(int.class, Object.class));
OBJECTS_TOSTRING = publicLookup.findStatic(Objects.class, "toString",
MethodType.methodType(String.class, Object.class));
OBJECT_EQ = lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.methodType(boolean.class, Object.class, Object.class));
HASH_COMBINER = lookup.findStatic(OBJECT_METHODS_CLASS, "hashCombiner",
MethodType.fromMethodDescriptorString("(II)I", loader));
primitiveEquals.put(byte.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(BB)Z", loader)));
primitiveEquals.put(short.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(SS)Z", loader)));
primitiveEquals.put(char.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(CC)Z", loader)));
primitiveEquals.put(int.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(II)Z", loader)));
primitiveEquals.put(long.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(JJ)Z", loader)));
primitiveEquals.put(float.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(FF)Z", loader)));
primitiveEquals.put(double.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(DD)Z", loader)));
primitiveEquals.put(boolean.class, lookup.findStatic(OBJECT_METHODS_CLASS, "eq",
MethodType.fromMethodDescriptorString("(ZZ)Z", loader)));
primitiveHashers.put(byte.class, lookup.findStatic(Byte.class, "hashCode",
MethodType.fromMethodDescriptorString("(B)I", loader)));
primitiveHashers.put(short.class, lookup.findStatic(Short.class, "hashCode",
MethodType.fromMethodDescriptorString("(S)I", loader)));
primitiveHashers.put(char.class, lookup.findStatic(Character.class, "hashCode",
MethodType.fromMethodDescriptorString("(C)I", loader)));
primitiveHashers.put(int.class, lookup.findStatic(Integer.class, "hashCode",
MethodType.fromMethodDescriptorString("(I)I", loader)));
primitiveHashers.put(long.class, lookup.findStatic(Long.class, "hashCode",
MethodType.fromMethodDescriptorString("(J)I", loader)));
primitiveHashers.put(float.class, lookup.findStatic(Float.class, "hashCode",
MethodType.fromMethodDescriptorString("(F)I", loader)));
primitiveHashers.put(double.class, lookup.findStatic(Double.class, "hashCode",
MethodType.fromMethodDescriptorString("(D)I", loader)));
primitiveHashers.put(boolean.class, lookup.findStatic(Boolean.class, "hashCode",
MethodType.fromMethodDescriptorString("(Z)I", loader)));
primitiveToString.put(byte.class, lookup.findStatic(Byte.class, "toString",
MethodType.methodType(String.class, byte.class)));
primitiveToString.put(short.class, lookup.findStatic(Short.class, "toString",
MethodType.methodType(String.class, short.class)));
primitiveToString.put(char.class, lookup.findStatic(Character.class, "toString",
MethodType.methodType(String.class, char.class)));
primitiveToString.put(int.class, lookup.findStatic(Integer.class, "toString",
MethodType.methodType(String.class, int.class)));
primitiveToString.put(long.class, lookup.findStatic(Long.class, "toString",
MethodType.methodType(String.class, long.class)));
primitiveToString.put(float.class, lookup.findStatic(Float.class, "toString",
MethodType.methodType(String.class, float.class)));
primitiveToString.put(double.class, lookup.findStatic(Double.class, "toString",
MethodType.methodType(String.class, double.class)));
primitiveToString.put(boolean.class, lookup.findStatic(Boolean.class, "toString",
MethodType.methodType(String.class, boolean.class)));
}
catch (ReflectiveOperationException e) {
throw new RuntimeException(e);
}
}
private static int hashCombiner(int x, int y) {
return x*31 + y;
}
private static boolean eq(Object a, Object b) { return a == b; }
private static boolean eq(byte a, byte b) { return a == b; }
private static boolean eq(short a, short b) { return a == b; }
private static boolean eq(char a, char b) { return a == b; }
private static boolean eq(int a, int b) { return a == b; }
private static boolean eq(long a, long b) { return a == b; }
private static boolean eq(float a, float b) { return Float.compare(a, b) == 0; }
private static boolean eq(double a, double b) { return Double.compare(a, b) == 0; }
private static boolean eq(boolean a, boolean b) { return a == b; }
/** Get the method handle for combining two values of a given type */
private static MethodHandle equalator(Class<?> clazz) {
return (clazz.isPrimitive()
? primitiveEquals.get(clazz)
: OBJECTS_EQUALS.asType(MethodType.methodType(boolean.class, clazz, clazz)));
}
/** Get the hasher for a value of a given type */
private static MethodHandle hasher(Class<?> clazz) {
return (clazz.isPrimitive()
? primitiveHashers.get(clazz)
: OBJECTS_HASHCODE.asType(MethodType.methodType(int.class, clazz)));
}
/** Get the stringifier for a value of a given type */
private static MethodHandle stringifier(Class<?> clazz) {
return (clazz.isPrimitive()
? primitiveToString.get(clazz)
: OBJECTS_TOSTRING.asType(MethodType.methodType(String.class, clazz)));
}
/**
* Generates a method handle for the {@code equals} method for a given data class
* @param receiverClass the data class
* @param getters the list of getters
* @return the method handle
*/
private static MethodHandle makeEquals(Class<?> receiverClass,
List<MethodHandle> getters) {
MethodType rr = MethodType.methodType(boolean.class, receiverClass, receiverClass);
MethodType ro = MethodType.methodType(boolean.class, receiverClass, Object.class);
MethodHandle instanceFalse = MethodHandles.dropArguments(FALSE, 0, receiverClass, Object.class); // (RO)Z
MethodHandle instanceTrue = MethodHandles.dropArguments(TRUE, 0, receiverClass, Object.class); // (RO)Z
MethodHandle isSameObject = OBJECT_EQ.asType(ro); // (RO)Z
MethodHandle isInstance = MethodHandles.dropArguments(CLASS_IS_INSTANCE.bindTo(receiverClass), 0, receiverClass); // (RO)Z
MethodHandle accumulator = MethodHandles.dropArguments(TRUE, 0, receiverClass, receiverClass); // (RR)Z
for (MethodHandle getter : getters) {
MethodHandle equalator = equalator(getter.type().returnType()); // (TT)Z
MethodHandle thisFieldEqual = MethodHandles.filterArguments(equalator, 0, getter, getter); // (RR)Z
accumulator = MethodHandles.guardWithTest(thisFieldEqual, accumulator, instanceFalse.asType(rr));
}
return MethodHandles.guardWithTest(isSameObject,
instanceTrue,
MethodHandles.guardWithTest(isInstance, accumulator.asType(ro), instanceFalse));
}
/**
* Generates a method handle for the {@code hashCode} method for a given data class
* @param receiverClass the data class
* @param getters the list of getters
* @return the method handle
*/
private static MethodHandle makeHashCode(Class<?> receiverClass,
List<MethodHandle> getters) {
MethodHandle accumulator = MethodHandles.dropArguments(ZERO, 0, receiverClass); // (R)I
// @@@ Use loop combinator instead?
for (MethodHandle getter : getters) {
MethodHandle hasher = hasher(getter.type().returnType()); // (T)I
MethodHandle hashThisField = MethodHandles.filterArguments(hasher, 0, getter); // (R)I
MethodHandle combineHashes = MethodHandles.filterArguments(HASH_COMBINER, 0, accumulator, hashThisField); // (RR)I
accumulator = MethodHandles.permuteArguments(combineHashes, accumulator.type(), 0, 0); // adapt (R)I to (RR)I
}
return accumulator;
}
/**
* Generates a method handle for the {@code toString} method for a given data class
* @param receiverClass the data class
* @param getters the list of getters
* @param names the names
* @return the method handle
*/
private static MethodHandle makeToString(Class<?> receiverClass,
List<MethodHandle> getters,
List<String> names) {
// This is a pretty lousy algorithm; we spread the receiver over N places,
// apply the N getters, apply N toString operations, and concat the result with String.format
// Better to use String.format directly, or delegate to StringConcatFactory
// Also probably want some quoting around String components
assert getters.size() == names.size();
int[] invArgs = new int[getters.size()];
Arrays.fill(invArgs, 0);
MethodHandle[] filters = new MethodHandle[getters.size()];
StringBuilder sb = new StringBuilder();
sb.append(receiverClass.getSimpleName()).append("[");
for (int i=0; i<getters.size(); i++) {
MethodHandle getter = getters.get(i); // (R)T
MethodHandle stringify = stringifier(getter.type().returnType()); // (T)String
MethodHandle stringifyThisField = MethodHandles.filterArguments(stringify, 0, getter); // (R)String
filters[i] = stringifyThisField;
sb.append(names.get(i)).append("=%s");
if (i != getters.size() - 1)
sb.append(", ");
}
sb.append(']');
String formatString = sb.toString();
MethodHandle formatter = MethodHandles.insertArguments(STRING_FORMAT, 0, formatString)
.asCollector(String[].class, getters.size()); // (R*)String
if (getters.size() == 0) {
// Add back extra R
formatter = MethodHandles.dropArguments(formatter, 0, receiverClass);
}
else {
MethodHandle filtered = MethodHandles.filterArguments(formatter, 0, filters);
formatter = MethodHandles.permuteArguments(filtered, MethodType.methodType(String.class, receiverClass), invArgs);
}
return formatter;
}
/**
* Bootstrap method to generate the {@link Object#equals(Object)},
* {@link Object#hashCode()}, and {@link Object#toString()} methods, based
* on a description of the component names and accessor methods, for either
* {@code invokedynamic} call sites or dynamic constant pool entries.
*
* For more detail on the semantics of the generated methods see the specification
* of {@link java.lang.Record#equals(Object)}, {@link java.lang.Record#hashCode()} and
* {@link java.lang.Record#toString()}.
*
*
* @param lookup Every bootstrap method is expected to have a {@code lookup}
* which usually represents a lookup context with the
* accessibility privileges of the caller. This is because
* {@code invokedynamic} call sites always provide a {@code lookup}
* to the corresponding bootstrap method, but this method just
* ignores the {@code lookup} parameter
* @param methodName the name of the method to generate, which must be one of
* {@code "equals"}, {@code "hashCode"}, or {@code "toString"}
* @param type a {@link MethodType} corresponding the descriptor type
* for the method, which must correspond to the descriptor
* for the corresponding {@link Object} method, if linking
* an {@code invokedynamic} call site, or the
* constant {@code MethodHandle.class}, if linking a
* dynamic constant
* @param recordClass the record class hosting the record components
* @param names the list of component names, joined into a string
* separated by ";", or the empty string if there are no
* components. Maybe be null, if the {@code methodName}
* is {@code "equals"} or {@code "hashCode"}.
* @param getters method handles for the accessor methods for the components
* @return a call site if invoked by indy, or a method handle
* if invoked by a condy
* @throws IllegalArgumentException if the bootstrap arguments are invalid
* or inconsistent
* @throws Throwable if any exception is thrown during call site construction
*/
public static Object bootstrap(MethodHandles.Lookup lookup, String methodName, TypeDescriptor type,
Class<?> recordClass,
String names,
MethodHandle... getters) throws Throwable {
MethodType methodType;
if (type instanceof MethodType)
methodType = (MethodType) type;
else {
methodType = null;
if (!MethodHandle.class.equals(type))
throw new IllegalArgumentException(type.toString());
}
List<MethodHandle> getterList = List.of(getters);
MethodHandle handle = switch (methodName) {
case "equals" -> {
if (methodType != null && !methodType.equals(MethodType.methodType(boolean.class, recordClass, Object.class)))
throw new IllegalArgumentException("Bad method type: " + methodType);
yield makeEquals(recordClass, getterList);
}
case "hashCode" -> {
if (methodType != null && !methodType.equals(MethodType.methodType(int.class, recordClass)))
throw new IllegalArgumentException("Bad method type: " + methodType);
yield makeHashCode(recordClass, getterList);
}
case "toString" -> {
if (methodType != null && !methodType.equals(MethodType.methodType(String.class, recordClass)))
throw new IllegalArgumentException("Bad method type: " + methodType);
List<String> nameList = "".equals(names) ? List.of() : List.of(names.split(";"));
if (nameList.size() != getterList.size())
throw new IllegalArgumentException("Name list and accessor list do not match");
yield makeToString(recordClass, getterList, nameList);
}
default -> throw new IllegalArgumentException(methodName);
};
return methodType != null ? new ConstantCallSite(handle) : handle;
}
}
⏎ java/lang/runtime/ObjectMethods.java
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File name: java.base-17.0.5-src.zip File size: 8883851 bytes Release date: 2022-09-13 Download
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