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JRE 8 rt.jar - java.* Package Source Code
JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries. JRE (Java Runtime) 8 is the runtime environment included in JDK 8. JRE 8 rt.jar libraries are divided into 6 packages:
com.* - Internal Oracle and Sun Microsystems libraries java.* - Standard Java API libraries. javax.* - Extended Java API libraries. jdk.* - JDK supporting libraries. org.* - Third party libraries. sun.* - Old libraries developed by Sun Microsystems.
JAR File Information:
Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib 63,596,151 rt.jar
Here is the list of Java classes of the java.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.
✍: FYIcenter
⏎ java/lang/invoke/CallSite.java
/* * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * * */ package java.lang.invoke; import sun.invoke.empty.Empty; import static java.lang.invoke.MethodHandleStatics.*; import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP; /** * A {@code CallSite} is a holder for a variable {@link MethodHandle}, * which is called its {@code target}. * An {@code invokedynamic} instruction linked to a {@code CallSite} delegates * all calls to the site's current target. * A {@code CallSite} may be associated with several {@code invokedynamic} * instructions, or it may be "free floating", associated with none. * In any case, it may be invoked through an associated method handle * called its {@linkplain #dynamicInvoker dynamic invoker}. * <p> * {@code CallSite} is an abstract class which does not allow * direct subclassing by users. It has three immediate, * concrete subclasses that may be either instantiated or subclassed. * <ul> * <li>If a mutable target is not required, an {@code invokedynamic} instruction * may be permanently bound by means of a {@linkplain ConstantCallSite constant call site}. * <li>If a mutable target is required which has volatile variable semantics, * because updates to the target must be immediately and reliably witnessed by other threads, * a {@linkplain VolatileCallSite volatile call site} may be used. * <li>Otherwise, if a mutable target is required, * a {@linkplain MutableCallSite mutable call site} may be used. * </ul> * <p> * A non-constant call site may be <em>relinked</em> by changing its target. * The new target must have the same {@linkplain MethodHandle#type() type} * as the previous target. * Thus, though a call site can be relinked to a series of * successive targets, it cannot change its type. * <p> * Here is a sample use of call sites and bootstrap methods which links every * dynamic call site to print its arguments: <blockquote><pre>{@code static void test() throws Throwable { // THE FOLLOWING LINE IS PSEUDOCODE FOR A JVM INSTRUCTION InvokeDynamic[#bootstrapDynamic].baz("baz arg", 2, 3.14); } private static void printArgs(Object... args) { System.out.println(java.util.Arrays.deepToString(args)); } private static final MethodHandle printArgs; static { MethodHandles.Lookup lookup = MethodHandles.lookup(); Class thisClass = lookup.lookupClass(); // (who am I?) printArgs = lookup.findStatic(thisClass, "printArgs", MethodType.methodType(void.class, Object[].class)); } private static CallSite bootstrapDynamic(MethodHandles.Lookup caller, String name, MethodType type) { // ignore caller and name, but match the type: return new ConstantCallSite(printArgs.asType(type)); } }</pre></blockquote> * @author John Rose, JSR 292 EG */ abstract public class CallSite { static { MethodHandleImpl.initStatics(); } // The actual payload of this call site: /*package-private*/ MethodHandle target; // Note: This field is known to the JVM. Do not change. /** * Make a blank call site object with the given method type. * An initial target method is supplied which will throw * an {@link IllegalStateException} if called. * <p> * Before this {@code CallSite} object is returned from a bootstrap method, * it is usually provided with a more useful target method, * via a call to {@link CallSite#setTarget(MethodHandle) setTarget}. * @throws NullPointerException if the proposed type is null */ /*package-private*/ CallSite(MethodType type) { target = makeUninitializedCallSite(type); } /** * Make a call site object equipped with an initial target method handle. * @param target the method handle which will be the initial target of the call site * @throws NullPointerException if the proposed target is null */ /*package-private*/ CallSite(MethodHandle target) { target.type(); // null check this.target = target; } /** * Make a call site object equipped with an initial target method handle. * @param targetType the desired type of the call site * @param createTargetHook a hook which will bind the call site to the target method handle * @throws WrongMethodTypeException if the hook cannot be invoked on the required arguments, * or if the target returned by the hook is not of the given {@code targetType} * @throws NullPointerException if the hook returns a null value * @throws ClassCastException if the hook returns something other than a {@code MethodHandle} * @throws Throwable anything else thrown by the hook function */ /*package-private*/ CallSite(MethodType targetType, MethodHandle createTargetHook) throws Throwable { this(targetType); ConstantCallSite selfCCS = (ConstantCallSite) this; MethodHandle boundTarget = (MethodHandle) createTargetHook.invokeWithArguments(selfCCS); checkTargetChange(this.target, boundTarget); this.target = boundTarget; } /** * Returns the type of this call site's target. * Although targets may change, any call site's type is permanent, and can never change to an unequal type. * The {@code setTarget} method enforces this invariant by refusing any new target that does * not have the previous target's type. * @return the type of the current target, which is also the type of any future target */ public MethodType type() { // warning: do not call getTarget here, because CCS.getTarget can throw IllegalStateException return target.type(); } /** * Returns the target method of the call site, according to the * behavior defined by this call site's specific class. * The immediate subclasses of {@code CallSite} document the * class-specific behaviors of this method. * * @return the current linkage state of the call site, its target method handle * @see ConstantCallSite * @see VolatileCallSite * @see #setTarget * @see ConstantCallSite#getTarget * @see MutableCallSite#getTarget * @see VolatileCallSite#getTarget */ public abstract MethodHandle getTarget(); /** * Updates the target method of this call site, according to the * behavior defined by this call site's specific class. * The immediate subclasses of {@code CallSite} document the * class-specific behaviors of this method. * <p> * The type of the new target must be {@linkplain MethodType#equals equal to} * the type of the old target. * * @param newTarget the new target * @throws NullPointerException if the proposed new target is null * @throws WrongMethodTypeException if the proposed new target * has a method type that differs from the previous target * @see CallSite#getTarget * @see ConstantCallSite#setTarget * @see MutableCallSite#setTarget * @see VolatileCallSite#setTarget */ public abstract void setTarget(MethodHandle newTarget); void checkTargetChange(MethodHandle oldTarget, MethodHandle newTarget) { MethodType oldType = oldTarget.type(); MethodType newType = newTarget.type(); // null check! if (!newType.equals(oldType)) throw wrongTargetType(newTarget, oldType); } private static WrongMethodTypeException wrongTargetType(MethodHandle target, MethodType type) { return new WrongMethodTypeException(String.valueOf(target)+" should be of type "+type); } /** * Produces a method handle equivalent to an invokedynamic instruction * which has been linked to this call site. * <p> * This method is equivalent to the following code: * <blockquote><pre>{@code * MethodHandle getTarget, invoker, result; * getTarget = MethodHandles.publicLookup().bind(this, "getTarget", MethodType.methodType(MethodHandle.class)); * invoker = MethodHandles.exactInvoker(this.type()); * result = MethodHandles.foldArguments(invoker, getTarget) * }</pre></blockquote> * * @return a method handle which always invokes this call site's current target */ public abstract MethodHandle dynamicInvoker(); /*non-public*/ MethodHandle makeDynamicInvoker() { MethodHandle getTarget = GET_TARGET.bindArgumentL(0, this); MethodHandle invoker = MethodHandles.exactInvoker(this.type()); return MethodHandles.foldArguments(invoker, getTarget); } private static final MethodHandle GET_TARGET; private static final MethodHandle THROW_UCS; static { try { GET_TARGET = IMPL_LOOKUP. findVirtual(CallSite.class, "getTarget", MethodType.methodType(MethodHandle.class)); THROW_UCS = IMPL_LOOKUP. findStatic(CallSite.class, "uninitializedCallSite", MethodType.methodType(Object.class, Object[].class)); } catch (ReflectiveOperationException e) { throw newInternalError(e); } } /** This guy is rolled into the default target if a MethodType is supplied to the constructor. */ private static Object uninitializedCallSite(Object... ignore) { throw new IllegalStateException("uninitialized call site"); } private MethodHandle makeUninitializedCallSite(MethodType targetType) { MethodType basicType = targetType.basicType(); MethodHandle invoker = basicType.form().cachedMethodHandle(MethodTypeForm.MH_UNINIT_CS); if (invoker == null) { invoker = THROW_UCS.asType(basicType); invoker = basicType.form().setCachedMethodHandle(MethodTypeForm.MH_UNINIT_CS, invoker); } // unchecked view is OK since no values will be received or returned return invoker.viewAsType(targetType, false); } // unsafe stuff: private static final long TARGET_OFFSET; static { try { TARGET_OFFSET = UNSAFE.objectFieldOffset(CallSite.class.getDeclaredField("target")); } catch (Exception ex) { throw new Error(ex); } } /*package-private*/ void setTargetNormal(MethodHandle newTarget) { MethodHandleNatives.setCallSiteTargetNormal(this, newTarget); } /*package-private*/ MethodHandle getTargetVolatile() { return (MethodHandle) UNSAFE.getObjectVolatile(this, TARGET_OFFSET); } /*package-private*/ void setTargetVolatile(MethodHandle newTarget) { MethodHandleNatives.setCallSiteTargetVolatile(this, newTarget); } // this implements the upcall from the JVM, MethodHandleNatives.makeDynamicCallSite: static CallSite makeSite(MethodHandle bootstrapMethod, // Callee information: String name, MethodType type, // Extra arguments for BSM, if any: Object info, // Caller information: Class<?> callerClass) { MethodHandles.Lookup caller = IMPL_LOOKUP.in(callerClass); CallSite site; try { Object binding; info = maybeReBox(info); if (info == null) { binding = bootstrapMethod.invoke(caller, name, type); } else if (!info.getClass().isArray()) { binding = bootstrapMethod.invoke(caller, name, type, info); } else { Object[] argv = (Object[]) info; maybeReBoxElements(argv); switch (argv.length) { case 0: binding = bootstrapMethod.invoke(caller, name, type); break; case 1: binding = bootstrapMethod.invoke(caller, name, type, argv[0]); break; case 2: binding = bootstrapMethod.invoke(caller, name, type, argv[0], argv[1]); break; case 3: binding = bootstrapMethod.invoke(caller, name, type, argv[0], argv[1], argv[2]); break; case 4: binding = bootstrapMethod.invoke(caller, name, type, argv[0], argv[1], argv[2], argv[3]); break; case 5: binding = bootstrapMethod.invoke(caller, name, type, argv[0], argv[1], argv[2], argv[3], argv[4]); break; case 6: binding = bootstrapMethod.invoke(caller, name, type, argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]); break; default: final int NON_SPREAD_ARG_COUNT = 3; // (caller, name, type) if (NON_SPREAD_ARG_COUNT + argv.length > MethodType.MAX_MH_ARITY) throw new BootstrapMethodError("too many bootstrap method arguments"); MethodType bsmType = bootstrapMethod.type(); MethodType invocationType = MethodType.genericMethodType(NON_SPREAD_ARG_COUNT + argv.length); MethodHandle typedBSM = bootstrapMethod.asType(invocationType); MethodHandle spreader = invocationType.invokers().spreadInvoker(NON_SPREAD_ARG_COUNT); binding = spreader.invokeExact(typedBSM, (Object)caller, (Object)name, (Object)type, argv); } } //System.out.println("BSM for "+name+type+" => "+binding); if (binding instanceof CallSite) { site = (CallSite) binding; } else { throw new ClassCastException("bootstrap method failed to produce a CallSite"); } if (!site.getTarget().type().equals(type)) throw wrongTargetType(site.getTarget(), type); } catch (Throwable ex) { BootstrapMethodError bex; if (ex instanceof BootstrapMethodError) bex = (BootstrapMethodError) ex; else bex = new BootstrapMethodError("call site initialization exception", ex); throw bex; } return site; } private static Object maybeReBox(Object x) { if (x instanceof Integer) { int xi = (int) x; if (xi == (byte) xi) x = xi; // must rebox; see JLS 5.1.7 } return x; } private static void maybeReBoxElements(Object[] xa) { for (int i = 0; i < xa.length; i++) { xa[i] = maybeReBox(xa[i]); } } }
⏎ java/lang/invoke/CallSite.java
Or download all of them as a single archive file:
File name: jre-rt-java-1.8.0_191-src.zip File size: 6664831 bytes Release date: 2018-10-28 Download
⇒ JRE 8 rt.jar - javax.* Package Source Code
2023-08-23, 247407👍, 4💬
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