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Clisprail
211 lines
8.1 KiB
Java
211 lines
8.1 KiB
Java
/***
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* ASM: a very small and fast Java bytecode manipulation framework
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* Copyright (c) 2000-2011 INRIA, France Telecom
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.objectweb.asm.tree;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Map;
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import org.objectweb.asm.MethodVisitor;
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import org.objectweb.asm.Opcodes;
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/**
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* A node that represents a stack map frame. These nodes are pseudo instruction
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* nodes in order to be inserted in an instruction list. In fact these nodes
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* must(*) be inserted <i>just before</i> any instruction node <b>i</b> that
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* follows an unconditionnal branch instruction such as GOTO or THROW, that is
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* the target of a jump instruction, or that starts an exception handler block.
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* The stack map frame types must describe the values of the local variables and
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* of the operand stack elements <i>just before</i> <b>i</b> is executed. <br>
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* <br>
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* (*) this is mandatory only for classes whose version is greater than or equal
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* to {@link org.objectweb.asm.Opcodes#V1_6 V1_6}.
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*
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* @author Eric Bruneton
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*/
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public class FrameNode extends AbstractInsnNode {
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/**
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* The type of this frame. Must be {@link org.objectweb.asm.Opcodes#F_NEW} for expanded
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* frames, or {@link org.objectweb.asm.Opcodes#F_FULL}, {@link org.objectweb.asm.Opcodes#F_APPEND},
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* {@link org.objectweb.asm.Opcodes#F_CHOP}, {@link org.objectweb.asm.Opcodes#F_SAME} or
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* {@link org.objectweb.asm.Opcodes#F_APPEND}, {@link org.objectweb.asm.Opcodes#F_SAME1} for compressed frames.
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*/
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public int type;
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/**
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* The types of the local variables of this stack map frame. Elements of
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* this list can be Integer, String or LabelNode objects (for primitive,
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* reference and uninitialized types respectively - see
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* {@link org.objectweb.asm.MethodVisitor}).
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*/
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public List<Object> local;
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/**
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* The types of the operand stack elements of this stack map frame. Elements
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* of this list can be Integer, String or LabelNode objects (for primitive,
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* reference and uninitialized types respectively - see
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* {@link org.objectweb.asm.MethodVisitor}).
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*/
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public List<Object> stack;
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private FrameNode() {
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super(-1);
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}
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/**
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* Constructs a new {@link org.objectweb.asm.tree.FrameNode}.
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*
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* @param type
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* the type of this frame. Must be {@link org.objectweb.asm.Opcodes#F_NEW} for
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* expanded frames, or {@link org.objectweb.asm.Opcodes#F_FULL},
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* {@link org.objectweb.asm.Opcodes#F_APPEND}, {@link org.objectweb.asm.Opcodes#F_CHOP},
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* {@link org.objectweb.asm.Opcodes#F_SAME} or {@link org.objectweb.asm.Opcodes#F_APPEND},
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* {@link org.objectweb.asm.Opcodes#F_SAME1} for compressed frames.
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* @param nLocal
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* number of local variables of this stack map frame.
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* @param local
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* the types of the local variables of this stack map frame.
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* Elements of this list can be Integer, String or LabelNode
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* objects (for primitive, reference and uninitialized types
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* respectively - see {@link org.objectweb.asm.MethodVisitor}).
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* @param nStack
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* number of operand stack elements of this stack map frame.
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* @param stack
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* the types of the operand stack elements of this stack map
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* frame. Elements of this list can be Integer, String or
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* LabelNode objects (for primitive, reference and uninitialized
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* types respectively - see {@link org.objectweb.asm.MethodVisitor}).
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*/
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public FrameNode(final int type, final int nLocal, final Object[] local,
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final int nStack, final Object[] stack) {
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super(-1);
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this.type = type;
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switch (type) {
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case Opcodes.F_NEW:
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case Opcodes.F_FULL:
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this.local = asList(nLocal, local);
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this.stack = asList(nStack, stack);
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break;
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case Opcodes.F_APPEND:
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this.local = asList(nLocal, local);
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break;
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case Opcodes.F_CHOP:
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this.local = Arrays.asList(new Object[nLocal]);
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break;
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case Opcodes.F_SAME:
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break;
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case Opcodes.F_SAME1:
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this.stack = asList(1, stack);
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break;
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}
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}
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@Override
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public int getType() {
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return FRAME;
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}
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/**
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* Makes the given visitor visit this stack map frame.
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*
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* @param mv
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* a method visitor.
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*/
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@Override
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public void accept(final MethodVisitor mv) {
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switch (type) {
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case Opcodes.F_NEW:
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case Opcodes.F_FULL:
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mv.visitFrame(type, local.size(), asArray(local), stack.size(),
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asArray(stack));
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break;
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case Opcodes.F_APPEND:
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mv.visitFrame(type, local.size(), asArray(local), 0, null);
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break;
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case Opcodes.F_CHOP:
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mv.visitFrame(type, local.size(), null, 0, null);
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break;
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case Opcodes.F_SAME:
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mv.visitFrame(type, 0, null, 0, null);
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break;
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case Opcodes.F_SAME1:
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mv.visitFrame(type, 0, null, 1, asArray(stack));
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break;
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}
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}
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@Override
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public AbstractInsnNode clone(final Map<LabelNode, LabelNode> labels) {
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FrameNode clone = new FrameNode();
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clone.type = type;
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if (local != null) {
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clone.local = new ArrayList<Object>();
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for (int i = 0; i < local.size(); ++i) {
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Object l = local.get(i);
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if (l instanceof LabelNode) {
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l = labels.get(l);
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}
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clone.local.add(l);
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}
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}
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if (stack != null) {
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clone.stack = new ArrayList<Object>();
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for (int i = 0; i < stack.size(); ++i) {
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Object s = stack.get(i);
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if (s instanceof LabelNode) {
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s = labels.get(s);
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}
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clone.stack.add(s);
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}
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}
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return clone;
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}
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// ------------------------------------------------------------------------
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private static List<Object> asList(final int n, final Object[] o) {
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return Arrays.asList(o).subList(0, n);
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}
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private static Object[] asArray(final List<Object> l) {
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Object[] objs = new Object[l.size()];
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for (int i = 0; i < objs.length; ++i) {
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Object o = l.get(i);
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if (o instanceof LabelNode) {
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o = ((LabelNode) o).getLabel();
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}
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objs[i] = o;
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}
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return objs;
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}
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}
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