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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/package-info.java
/* * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * * */ /** * The {@code java.lang.invoke} package contains dynamic language support provided directly by * the Java core class libraries and virtual machine. * * <p> * As described in the Java Virtual Machine Specification, * certain types in this package have special relations to dynamic * language support in the virtual machine: * <ul> * <li>The class {@link java.lang.invoke.MethodHandle MethodHandle} contains * <a href="MethodHandle.html#sigpoly">signature polymorphic methods</a> * which can be linked regardless of their type descriptor. * Normally, method linkage requires exact matching of type descriptors. * </li> * * <li>The JVM bytecode format supports immediate constants of * the classes {@link java.lang.invoke.MethodHandle MethodHandle} and {@link java.lang.invoke.MethodType MethodType}. * </li> * </ul> * * <h1><a name="jvm_mods"></a>Summary of relevant Java Virtual Machine changes</h1> * The following low-level information summarizes relevant parts of the * Java Virtual Machine specification. For full details, please see the * current version of that specification. * * Each occurrence of an {@code invokedynamic} instruction is called a <em>dynamic call site</em>. * <h2><a name="indyinsn"></a>{@code invokedynamic} instructions</h2> * A dynamic call site is originally in an unlinked state. In this state, there is * no target method for the call site to invoke. * <p> * Before the JVM can execute a dynamic call site (an {@code invokedynamic} instruction), * the call site must first be <em>linked</em>. * Linking is accomplished by calling a <em>bootstrap method</em> * which is given the static information content of the call site, * and which must produce a {@link java.lang.invoke.MethodHandle method handle} * that gives the behavior of the call site. * <p> * Each {@code invokedynamic} instruction statically specifies its own * bootstrap method as a constant pool reference. * The constant pool reference also specifies the call site's name and type descriptor, * just like {@code invokevirtual} and the other invoke instructions. * <p> * Linking starts with resolving the constant pool entry for the * bootstrap method, and resolving a {@link java.lang.invoke.MethodType MethodType} object for * the type descriptor of the dynamic call site. * This resolution process may trigger class loading. * It may therefore throw an error if a class fails to load. * This error becomes the abnormal termination of the dynamic * call site execution. * Linkage does not trigger class initialization. * <p> * The bootstrap method is invoked on at least three values: * <ul> * <li>a {@code MethodHandles.Lookup}, a lookup object on the <em>caller class</em> in which dynamic call site occurs </li> * <li>a {@code String}, the method name mentioned in the call site </li> * <li>a {@code MethodType}, the resolved type descriptor of the call </li> * <li>optionally, between 1 and 251 additional static arguments taken from the constant pool </li> * </ul> * Invocation is as if by * {@link java.lang.invoke.MethodHandle#invoke MethodHandle.invoke}. * The returned result must be a {@link java.lang.invoke.CallSite CallSite} (or a subclass). * The type of the call site's target must be exactly equal to the type * derived from the dynamic call site's type descriptor and passed to * the bootstrap method. * The call site then becomes permanently linked to the dynamic call site. * <p> * As documented in the JVM specification, all failures arising from * the linkage of a dynamic call site are reported * by a {@link java.lang.BootstrapMethodError BootstrapMethodError}, * which is thrown as the abnormal termination of the dynamic call * site execution. * If this happens, the same error will the thrown for all subsequent * attempts to execute the dynamic call site. * * <h2>timing of linkage</h2> * A dynamic call site is linked just before its first execution. * The bootstrap method call implementing the linkage occurs within * a thread that is attempting a first execution. * <p> * If there are several such threads, the bootstrap method may be * invoked in several threads concurrently. * Therefore, bootstrap methods which access global application * data must take the usual precautions against race conditions. * In any case, every {@code invokedynamic} instruction is either * unlinked or linked to a unique {@code CallSite} object. * <p> * In an application which requires dynamic call sites with individually * mutable behaviors, their bootstrap methods should produce distinct * {@link java.lang.invoke.CallSite CallSite} objects, one for each linkage request. * Alternatively, an application can link a single {@code CallSite} object * to several {@code invokedynamic} instructions, in which case * a change to the target method will become visible at each of * the instructions. * <p> * If several threads simultaneously execute a bootstrap method for a single dynamic * call site, the JVM must choose one {@code CallSite} object and install it visibly to * all threads. Any other bootstrap method calls are allowed to complete, but their * results are ignored, and their dynamic call site invocations proceed with the originally * chosen target object. * <p style="font-size:smaller;"> * <em>Discussion:</em> * These rules do not enable the JVM to duplicate dynamic call sites, * or to issue “causeless” bootstrap method calls. * Every dynamic call site transitions at most once from unlinked to linked, * just before its first invocation. * There is no way to undo the effect of a completed bootstrap method call. * * <h2>types of bootstrap methods</h2> * As long as each bootstrap method can be correctly invoked * by {@code MethodHandle.invoke}, its detailed type is arbitrary. * For example, the first argument could be {@code Object} * instead of {@code MethodHandles.Lookup}, and the return type * could also be {@code Object} instead of {@code CallSite}. * (Note that the types and number of the stacked arguments limit * the legal kinds of bootstrap methods to appropriately typed * static methods and constructors of {@code CallSite} subclasses.) * <p> * If a given {@code invokedynamic} instruction specifies no static arguments, * the instruction's bootstrap method will be invoked on three arguments, * conveying the instruction's caller class, name, and method type. * If the {@code invokedynamic} instruction specifies one or more static arguments, * those values will be passed as additional arguments to the method handle. * (Note that because there is a limit of 255 arguments to any method, * at most 251 extra arguments can be supplied, since the bootstrap method * handle itself and its first three arguments must also be stacked.) * The bootstrap method will be invoked as if by either {@code MethodHandle.invoke} * or {@code invokeWithArguments}. (There is no way to tell the difference.) * <p> * The normal argument conversion rules for {@code MethodHandle.invoke} apply to all stacked arguments. * For example, if a pushed value is a primitive type, it may be converted to a reference by boxing conversion. * If the bootstrap method is a variable arity method (its modifier bit {@code 0x0080} is set), * then some or all of the arguments specified here may be collected into a trailing array parameter. * (This is not a special rule, but rather a useful consequence of the interaction * between {@code CONSTANT_MethodHandle} constants, the modifier bit for variable arity methods, * and the {@link java.lang.invoke.MethodHandle#asVarargsCollector asVarargsCollector} transformation.) * <p> * Given these rules, here are examples of legal bootstrap method declarations, * given various numbers {@code N} of extra arguments. * The first rows (marked {@code *}) will work for any number of extra arguments. * <table border=1 cellpadding=5 summary="Static argument types"> * <tr><th>N</th><th>sample bootstrap method</th></tr> * <tr><td>*</td><td><code>CallSite bootstrap(Lookup caller, String name, MethodType type, Object... args)</code></td></tr> * <tr><td>*</td><td><code>CallSite bootstrap(Object... args)</code></td></tr> * <tr><td>*</td><td><code>CallSite bootstrap(Object caller, Object... nameAndTypeWithArgs)</code></td></tr> * <tr><td>0</td><td><code>CallSite bootstrap(Lookup caller, String name, MethodType type)</code></td></tr> * <tr><td>0</td><td><code>CallSite bootstrap(Lookup caller, Object... nameAndType)</code></td></tr> * <tr><td>1</td><td><code>CallSite bootstrap(Lookup caller, String name, MethodType type, Object arg)</code></td></tr> * <tr><td>2</td><td><code>CallSite bootstrap(Lookup caller, String name, MethodType type, Object... args)</code></td></tr> * <tr><td>2</td><td><code>CallSite bootstrap(Lookup caller, String name, MethodType type, String... args)</code></td></tr> * <tr><td>2</td><td><code>CallSite bootstrap(Lookup caller, String name, MethodType type, String x, int y)</code></td></tr> * </table> * The last example assumes that the extra arguments are of type * {@code CONSTANT_String} and {@code CONSTANT_Integer}, respectively. * The second-to-last example assumes that all extra arguments are of type * {@code CONSTANT_String}. * The other examples work with all types of extra arguments. * <p> * As noted above, the actual method type of the bootstrap method can vary. * For example, the fourth argument could be {@code MethodHandle}, * if that is the type of the corresponding constant in * the {@code CONSTANT_InvokeDynamic} entry. * In that case, the {@code MethodHandle.invoke} call will pass the extra method handle * constant as an {@code Object}, but the type matching machinery of {@code MethodHandle.invoke} * will cast the reference back to {@code MethodHandle} before invoking the bootstrap method. * (If a string constant were passed instead, by badly generated code, that cast would then fail, * resulting in a {@code BootstrapMethodError}.) * <p> * Note that, as a consequence of the above rules, the bootstrap method may accept a primitive * argument, if it can be represented by a constant pool entry. * However, arguments of type {@code boolean}, {@code byte}, {@code short}, or {@code char} * cannot be created for bootstrap methods, since such constants cannot be directly * represented in the constant pool, and the invocation of the bootstrap method will * not perform the necessary narrowing primitive conversions. * <p> * Extra bootstrap method arguments are intended to allow language implementors * to safely and compactly encode metadata. * In principle, the name and extra arguments are redundant, * since each call site could be given its own unique bootstrap method. * Such a practice is likely to produce large class files and constant pools. * * @author John Rose, JSR 292 EG * @since 1.7 */ package java.lang.invoke;
⏎ java/lang/invoke/package-info.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, 247374👍, 4💬
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