import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
/**
 * Constructor
 *
 * @param token      token
 * @param finish     finish
 * @param statements statements
 */
public Block(final long token, final int finish, final Statement... statements) {
    super(token, finish);

    this.statements = Arrays.asList(statements);
    this.symbols    = new LinkedHashMap<>();
    this.entryLabel = new Label("block_entry");
    this.breakLabel = new Label("block_break");
    final int len = statements.length;
    this.flags = len > 0 && statements[len - 1].hasTerminalFlags() ? IS_TERMINAL : 0;
    this.conversion = null;
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
/**
 * Constructors
 *
 * @param token    token
 * @param finish   finish
 * @param test     case test node, can be any node in JavaScript
 * @param body     case body
 */
public CaseNode(final long token, final int finish, final Expression test, final Block body) {
    super(token, finish);

    this.test  = test;
    this.body  = body;
    this.entry = new Label("entry");
    this.conversion = null;
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
/**
 * Constructor
 *
 * @param token      The first token of the block
 * @param finish     The index of the last character
 * @param flags      The flags of the block
 * @param statements All statements in the block
 */
public Block(final long token, final int finish, final int flags, final Statement... statements) {
    super(token, finish);

    this.statements = Arrays.asList(statements);
    this.symbols    = new LinkedHashMap<>();
    this.entryLabel = new Label("block_entry");
    this.breakLabel = new Label("block_break");
    final int len = statements.length;
    final int terminalFlags = len > 0 && statements[len - 1].hasTerminalFlags() ? IS_TERMINAL : 0;
    this.flags = terminalFlags | flags;
    this.conversion = null;
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
public Label getBreakLabel() {
    return breakLabel;
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
public List<Label> getLabels() {
    return Collections.unmodifiableList(Arrays.asList(entryLabel, breakLabel));
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
/**
 * Return the break label, i.e. the location to go to on break.
 * @return the break label
 */
@Override
public Label getBreakLabel() {
    return breakLabel;
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
public List<Label> getLabels() {
    return Collections.unmodifiableList(Arrays.asList(breakLabel, continueLabel));
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
public Label getTargetLabel(final BreakableNode target) {
    return target.getBreakLabel();
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
public Label getTargetLabel(final BreakableNode target) {
    return ((LoopNode)target).getContinueLabel();
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
public List<Label> getLabels() {
    return Collections.unmodifiableList(Collections.singletonList(entry));
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
Label getTargetLabel(final BreakableNode target) {
    return target.getBreakLabel();
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
Label getTargetLabel(final BreakableNode target) {
    return ((LoopNode)target).getContinueLabel();
}
 

import jdk.nashorn.internal.codegen.Label; //导入依赖的package包/类
@Override
Label getTargetLabel(final BreakableNode target) {
    assert target != null;
    // We're jumping to the entry of the inlined finally block
    return ((Block)target).getEntryLabel();
}