import jdk.internal.org.objectweb.asm.tree.JumpInsnNode; //导入依赖的package包/类
public boolean merge(final Subroutine subroutine) throws AnalyzerException {
    boolean changes = false;
    for (int i = 0; i < access.length; ++i) {
        if (subroutine.access[i] && !access[i]) {
            access[i] = true;
            changes = true;
        }
    }
    if (subroutine.start == start) {
        for (int i = 0; i < subroutine.callers.size(); ++i) {
            JumpInsnNode caller = subroutine.callers.get(i);
            if (!callers.contains(caller)) {
                callers.add(caller);
                changes = true;
            }
        }
    }
    return changes;
}
 

import jdk.internal.org.objectweb.asm.tree.JumpInsnNode; //导入依赖的package包/类
/**
 * Detects a JSR instruction and sets a flag to indicate we will need to do
 * inlining.
 */
@Override
public void visitJumpInsn(final int opcode, final Label lbl) {
    super.visitJumpInsn(opcode, lbl);
    LabelNode ln = ((JumpInsnNode) instructions.getLast()).label;
    if (opcode == JSR && !subroutineHeads.containsKey(ln)) {
        subroutineHeads.put(ln, new BitSet());
    }
}
 

import jdk.internal.org.objectweb.asm.tree.JumpInsnNode; //导入依赖的package包/类
Subroutine(final LabelNode start, final int maxLocals,
        final JumpInsnNode caller) {
    this.start = start;
    this.access = new boolean[maxLocals];
    this.callers = new ArrayList<JumpInsnNode>();
    callers.add(caller);
}
 

import jdk.internal.org.objectweb.asm.tree.JumpInsnNode; //导入依赖的package包/类
public Subroutine copy() {
    Subroutine result = new Subroutine();
    result.start = start;
    result.access = new boolean[access.length];
    System.arraycopy(access, 0, result.access, 0, access.length);
    result.callers = new ArrayList<JumpInsnNode>(callers);
    return result;
}
 

import jdk.internal.org.objectweb.asm.tree.JumpInsnNode; //导入依赖的package包/类
Subroutine(
    final LabelNode start,
    final int maxLocals,
    final JumpInsnNode caller)
{
    this.start = start;
    this.access = new boolean[maxLocals];
    this.callers = new ArrayList<JumpInsnNode>();
    callers.add(caller);
}