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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
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* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
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package jdk.internal.org.objectweb.asm.tree;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import jdk.internal.org.objectweb.asm.Opcodes;
A node that represents a stack map frame. These nodes are pseudo instruction
nodes in order to be inserted in an instruction list. In fact these nodes
must(*) be inserted just before any instruction node i that
follows an unconditionnal branch instruction such as GOTO or THROW, that is
the target of a jump instruction, or that starts an exception handler block.
The stack map frame types must describe the values of the local variables and
of the operand stack elements just before i is executed.
(*) this is mandatory only for classes whose version is greater than or equal to V1_6. Author: Eric Bruneton
/**
* A node that represents a stack map frame. These nodes are pseudo instruction
* nodes in order to be inserted in an instruction list. In fact these nodes
* must(*) be inserted <i>just before</i> any instruction node <b>i</b> that
* follows an unconditionnal branch instruction such as GOTO or THROW, that is
* the target of a jump instruction, or that starts an exception handler block.
* The stack map frame types must describe the values of the local variables and
* of the operand stack elements <i>just before</i> <b>i</b> is executed. <br>
* <br>
* (*) this is mandatory only for classes whose version is greater than or equal
* to {@link Opcodes#V1_6 V1_6}.
*
* @author Eric Bruneton
*/
public class FrameNode extends AbstractInsnNode {
The type of this frame. Must be Opcodes.F_NEW for expanded frames, or Opcodes.F_FULL, Opcodes.F_APPEND, Opcodes.F_CHOP, Opcodes.F_SAME or Opcodes.F_APPEND, Opcodes.F_SAME1 for compressed frames. /**
* The type of this frame. Must be {@link Opcodes#F_NEW} for expanded
* frames, or {@link Opcodes#F_FULL}, {@link Opcodes#F_APPEND},
* {@link Opcodes#F_CHOP}, {@link Opcodes#F_SAME} or
* {@link Opcodes#F_APPEND}, {@link Opcodes#F_SAME1} for compressed frames.
*/
public int type;
The types of the local variables of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see MethodVisitor). /**
* The types of the local variables of this stack map frame. Elements of
* this list can be Integer, String or LabelNode objects (for primitive,
* reference and uninitialized types respectively - see
* {@link MethodVisitor}).
*/
public List<Object> local;
The types of the operand stack elements of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see MethodVisitor). /**
* The types of the operand stack elements of this stack map frame. Elements
* of this list can be Integer, String or LabelNode objects (for primitive,
* reference and uninitialized types respectively - see
* {@link MethodVisitor}).
*/
public List<Object> stack;
private FrameNode() {
super(-1);
}
Constructs a new FrameNode. Params: - type – the type of this frame. Must be
Opcodes.F_NEW for expanded frames, or Opcodes.F_FULL, Opcodes.F_APPEND, Opcodes.F_CHOP, Opcodes.F_SAME or Opcodes.F_APPEND, Opcodes.F_SAME1 for compressed frames. - nLocal –
number of local variables of this stack map frame.
- local – the types of the local variables of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see
MethodVisitor). - nStack –
number of operand stack elements of this stack map frame.
- stack – the types of the operand stack elements of this stack map frame. Elements of this list can be Integer, String or LabelNode objects (for primitive, reference and uninitialized types respectively - see
MethodVisitor).
/**
* Constructs a new {@link FrameNode}.
*
* @param type
* the type of this frame. Must be {@link Opcodes#F_NEW} for
* expanded frames, or {@link Opcodes#F_FULL},
* {@link Opcodes#F_APPEND}, {@link Opcodes#F_CHOP},
* {@link Opcodes#F_SAME} or {@link Opcodes#F_APPEND},
* {@link Opcodes#F_SAME1} for compressed frames.
* @param nLocal
* number of local variables of this stack map frame.
* @param local
* the types of the local variables of this stack map frame.
* Elements of this list can be Integer, String or LabelNode
* objects (for primitive, reference and uninitialized types
* respectively - see {@link MethodVisitor}).
* @param nStack
* number of operand stack elements of this stack map frame.
* @param stack
* the types of the operand stack elements of this stack map
* frame. Elements of this list can be Integer, String or
* LabelNode objects (for primitive, reference and uninitialized
* types respectively - see {@link MethodVisitor}).
*/
public FrameNode(final int type, final int nLocal, final Object[] local,
final int nStack, final Object[] stack) {
super(-1);
this.type = type;
switch (type) {
case Opcodes.F_NEW:
case Opcodes.F_FULL:
this.local = asList(nLocal, local);
this.stack = asList(nStack, stack);
break;
case Opcodes.F_APPEND:
this.local = asList(nLocal, local);
break;
case Opcodes.F_CHOP:
this.local = Arrays.asList(new Object[nLocal]);
break;
case Opcodes.F_SAME:
break;
case Opcodes.F_SAME1:
this.stack = asList(1, stack);
break;
}
}
@Override
public int getType() {
return FRAME;
}
Makes the given visitor visit this stack map frame.
Params: - mv –
a method visitor.
/**
* Makes the given visitor visit this stack map frame.
*
* @param mv
* a method visitor.
*/
@Override
public void accept(final MethodVisitor mv) {
switch (type) {
case Opcodes.F_NEW:
case Opcodes.F_FULL:
mv.visitFrame(type, local.size(), asArray(local), stack.size(),
asArray(stack));
break;
case Opcodes.F_APPEND:
mv.visitFrame(type, local.size(), asArray(local), 0, null);
break;
case Opcodes.F_CHOP:
mv.visitFrame(type, local.size(), null, 0, null);
break;
case Opcodes.F_SAME:
mv.visitFrame(type, 0, null, 0, null);
break;
case Opcodes.F_SAME1:
mv.visitFrame(type, 0, null, 1, asArray(stack));
break;
}
}
@Override
public AbstractInsnNode clone(final Map<LabelNode, LabelNode> labels) {
FrameNode clone = new FrameNode();
clone.type = type;
if (local != null) {
clone.local = new ArrayList<Object>();
for (int i = 0; i < local.size(); ++i) {
Object l = local.get(i);
if (l instanceof LabelNode) {
l = labels.get(l);
}
clone.local.add(l);
}
}
if (stack != null) {
clone.stack = new ArrayList<Object>();
for (int i = 0; i < stack.size(); ++i) {
Object s = stack.get(i);
if (s instanceof LabelNode) {
s = labels.get(s);
}
clone.stack.add(s);
}
}
return clone;
}
// ------------------------------------------------------------------------
private static List<Object> asList(final int n, final Object[] o) {
return Arrays.asList(o).subList(0, n);
}
private static Object[] asArray(final List<Object> l) {
Object[] objs = new Object[l.size()];
for (int i = 0; i < objs.length; ++i) {
Object o = l.get(i);
if (o instanceof LabelNode) {
o = ((LabelNode) o).getLabel();
}
objs[i] = o;
}
return objs;
}
}