import jdk.nashorn.internal.codegen.ClassEmitter.Flag; //导入依赖的package包/类
/**
 * Add an empty <init> method to the JavaScript class.
 *
 * @param classEmitter Open class emitter.
 * @param className    Name of JavaScript class.
 */
private static void newAllocate(final String className, final ClassEmitter classEmitter) {
    final MethodEmitter allocate = classEmitter.method(EnumSet.of(Flag.PUBLIC, Flag.STATIC), ALLOCATE.symbolName(), ScriptObject.class, PropertyMap.class);
    allocate.begin();
    allocate._new(className, Type.typeFor(ScriptObject.class));
    allocate.dup();
    allocate.load(Type.typeFor(PropertyMap.class), 0);
    allocate.invoke(constructorNoLookup(className, PropertyMap.class));
    allocate._return();
    allocate.end();
}
 

import jdk.nashorn.internal.codegen.ClassEmitter.Flag; //导入依赖的package包/类
private CompileUnit initCompileUnit(final String unitClassName, final long initialWeight) {
    final ClassEmitter classEmitter = new ClassEmitter(env, source.getName(), unitClassName, strict);
    final CompileUnit  compileUnit  = new CompileUnit(unitClassName, classEmitter, initialWeight);

    classEmitter.begin();

    final MethodEmitter initMethod = classEmitter.init(EnumSet.of(Flag.PRIVATE));
    initMethod.begin();
    initMethod.load(Type.OBJECT, 0);
    initMethod.newInstance(jdk.nashorn.internal.scripts.JS.class);
    initMethod.returnVoid();
    initMethod.end();

    return compileUnit;
}
 

import jdk.nashorn.internal.codegen.ClassEmitter.Flag; //导入依赖的package包/类
/**
 * Add an empty <init> method to the JavaScript class.
 *
 * @param classEmitter Open class emitter.
 * @param className    Name of JavaScript class.
 */
private static void newAllocate(final ClassEmitter classEmitter, final String className) {
    final MethodEmitter allocate = classEmitter.method(EnumSet.of(Flag.PUBLIC, Flag.STATIC), ALLOCATE.symbolName(), ScriptObject.class, PropertyMap.class);
    allocate.begin();
    allocate._new(className);
    allocate.dup();
    allocate.load(Type.typeFor(PropertyMap.class), 0);
    allocate.invoke(constructorNoLookup(className, PropertyMap.class));
    allocate._return();
    allocate.end();
}
 

import jdk.nashorn.internal.codegen.ClassEmitter.Flag; //导入依赖的package包/类
/**
 * Push a method handle to the stack
 *
 * @param className  class name
 * @param methodName method name
 * @param descName   descriptor
 * @param flags      flags that describe this handle, e.g. invokespecial new, or invoke virtual
 *
 * @return the method emitter
 */
MethodEmitter loadHandle(final String className, final String methodName, final String descName, final EnumSet<Flag> flags) {
    final int flag = Flag.getValue(flags);
    debug("load handle ");
    pushType(Type.OBJECT.ldc(method, new Handle(flag, className, methodName, descName, flag == H_INVOKEINTERFACE)));
    return this;
}
 

import jdk.nashorn.internal.codegen.ClassEmitter.Flag; //导入依赖的package包/类
/**
 * Push a method handle to the stack
 *
 * @param className  class name
 * @param methodName method name
 * @param descName   descriptor
 * @param flags      flags that describe this handle, e.g. invokespecial new, or invoke virtual
 *
 * @return the method emitter
 */
@SuppressWarnings("deprecation")
MethodEmitter loadHandle(final String className, final String methodName, final String descName, final EnumSet<Flag> flags) {
    debug("load handle ");
    pushType(Type.OBJECT.ldc(method, new Handle(Flag.getValue(flags), className, methodName, descName)));
    return this;
}
 

import jdk.nashorn.internal.codegen.ClassEmitter.Flag; //导入依赖的package包/类
/**
 * Push a method handle to the stack
 *
 * @param className  class name
 * @param methodName method name
 * @param descName   descriptor
 * @param flags      flags that describe this handle, e.g. invokespecial new, or invoke virtual
 *
 * @return the method emitter
 */
MethodEmitter loadHandle(final String className, final String methodName, final String descName, final EnumSet<Flag> flags) {
    debug("load handle ");
    pushType(Type.OBJECT.ldc(method, new Handle(Flag.getValue(flags), className, methodName, descName)));
    return this;
}