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// 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:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
package org.objectweb.asm.tree;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.objectweb.asm.MethodVisitor;
/**
* A node that represents a bytecode instruction. <i>An instruction can appear at most once in at
* most one {@link InsnList} at a time</i>.
*
* @author Eric Bruneton
*/
public abstract class AbstractInsnNode {
/** The type of {@link InsnNode} instructions. */
public static final int INSN = 0;
/** The type of {@link IntInsnNode} instructions. */
public static final int INT_INSN = 1;
/** The type of {@link VarInsnNode} instructions. */
public static final int VAR_INSN = 2;
/** The type of {@link TypeInsnNode} instructions. */
public static final int TYPE_INSN = 3;
/** The type of {@link FieldInsnNode} instructions. */
public static final int FIELD_INSN = 4;
/** The type of {@link MethodInsnNode} instructions. */
public static final int METHOD_INSN = 5;
/** The type of {@link InvokeDynamicInsnNode} instructions. */
public static final int INVOKE_DYNAMIC_INSN = 6;
/** The type of {@link JumpInsnNode} instructions. */
public static final int JUMP_INSN = 7;
/** The type of {@link LabelNode} "instructions". */
public static final int LABEL = 8;
/** The type of {@link LdcInsnNode} instructions. */
public static final int LDC_INSN = 9;
/** The type of {@link IincInsnNode} instructions. */
public static final int IINC_INSN = 10;
/** The type of {@link TableSwitchInsnNode} instructions. */
public static final int TABLESWITCH_INSN = 11;
/** The type of {@link LookupSwitchInsnNode} instructions. */
public static final int LOOKUPSWITCH_INSN = 12;
/** The type of {@link MultiANewArrayInsnNode} instructions. */
public static final int MULTIANEWARRAY_INSN = 13;
/** The type of {@link FrameNode} "instructions". */
public static final int FRAME = 14;
/** The type of {@link LineNumberNode} "instructions". */
public static final int LINE = 15;
/**
* The opcode of this instruction, or -1 if this is not a JVM instruction (e.g. a label or a line
* number).
*/
protected int opcode;
/**
* The runtime visible type annotations of this instruction. This field is only used for real
* instructions (i.e. not for labels, frames, or line number nodes). This list is a list of {@link
* TypeAnnotationNode} objects. May be {@literal null}.
*/
public List<TypeAnnotationNode> visibleTypeAnnotations;
/**
* The runtime invisible type annotations of this instruction. This field is only used for real
* instructions (i.e. not for labels, frames, or line number nodes). This list is a list of {@link
* TypeAnnotationNode} objects. May be {@literal null}.
*/
public List<TypeAnnotationNode> invisibleTypeAnnotations;
/** The previous instruction in the list to which this instruction belongs. */
AbstractInsnNode previousInsn;
/** The next instruction in the list to which this instruction belongs. */
AbstractInsnNode nextInsn;
/**
* The index of this instruction in the list to which it belongs. The value of this field is
* correct only when {@link InsnList#cache} is not null. A value of -1 indicates that this
* instruction does not belong to any {@link InsnList}.
*/
int index;
/**
* Constructs a new {@link AbstractInsnNode}.
*
* @param opcode the opcode of the instruction to be constructed.
*/
protected AbstractInsnNode(final int opcode) {
this.opcode = opcode;
this.index = -1;
}
/**
* Returns the opcode of this instruction.
*
* @return the opcode of this instruction, or -1 if this is not a JVM instruction (e.g. a label or
* a line number).
*/
public int getOpcode() {
return opcode;
}
/**
* Returns the type of this instruction.
*
* @return the type of this instruction, i.e. one the constants defined in this class.
*/
public abstract int getType();
/**
* Returns the previous instruction in the list to which this instruction belongs, if any.
*
* @return the previous instruction in the list to which this instruction belongs, if any. May be
* {@literal null}.
*/
public AbstractInsnNode getPrevious() {
return previousInsn;
}
/**
* Returns the next instruction in the list to which this instruction belongs, if any.
*
* @return the next instruction in the list to which this instruction belongs, if any. May be
* {@literal null}.
*/
public AbstractInsnNode getNext() {
return nextInsn;
}
/**
* Makes the given method visitor visit this instruction.
*
* @param methodVisitor a method visitor.
*/
public abstract void accept(MethodVisitor methodVisitor);
/**
* Makes the given visitor visit the annotations of this instruction.
*
* @param methodVisitor a method visitor.
*/
protected final void acceptAnnotations(final MethodVisitor methodVisitor) {
if (visibleTypeAnnotations != null) {
for (int i = 0, n = visibleTypeAnnotations.size(); i < n; ++i) {
TypeAnnotationNode typeAnnotation = visibleTypeAnnotations.get(i);
typeAnnotation.accept(
methodVisitor.visitInsnAnnotation(
typeAnnotation.typeRef, typeAnnotation.typePath, typeAnnotation.desc, true));
}
}
if (invisibleTypeAnnotations != null) {
for (int i = 0, n = invisibleTypeAnnotations.size(); i < n; ++i) {
TypeAnnotationNode typeAnnotation = invisibleTypeAnnotations.get(i);
typeAnnotation.accept(
methodVisitor.visitInsnAnnotation(
typeAnnotation.typeRef, typeAnnotation.typePath, typeAnnotation.desc, false));
}
}
}
/**
* Returns a copy of this instruction.
*
* @param clonedLabels a map from LabelNodes to cloned LabelNodes.
* @return a copy of this instruction. The returned instruction does not belong to any {@link
* InsnList}.
*/
public abstract AbstractInsnNode clone(Map<LabelNode, LabelNode> clonedLabels);
/**
* Returns the clone of the given label.
*
* @param label a label.
* @param clonedLabels a map from LabelNodes to cloned LabelNodes.
* @return the clone of the given label.
*/
static LabelNode clone(final LabelNode label, final Map<LabelNode, LabelNode> clonedLabels) {
return clonedLabels.get(label);
}
/**
* Returns the clones of the given labels.
*
* @param labels a list of labels.
* @param clonedLabels a map from LabelNodes to cloned LabelNodes.
* @return the clones of the given labels.
*/
static LabelNode[] clone(
final List<LabelNode> labels, final Map<LabelNode, LabelNode> clonedLabels) {
LabelNode[] clones = new LabelNode[labels.size()];
for (int i = 0, n = clones.length; i < n; ++i) {
clones[i] = clonedLabels.get(labels.get(i));
}
return clones;
}
/**
* Clones the annotations of the given instruction into this instruction.
*
* @param insnNode the source instruction.
* @return this instruction.
*/
protected final AbstractInsnNode cloneAnnotations(final AbstractInsnNode insnNode) {
if (insnNode.visibleTypeAnnotations != null) {
this.visibleTypeAnnotations = new ArrayList<>();
for (int i = 0, n = insnNode.visibleTypeAnnotations.size(); i < n; ++i) {
TypeAnnotationNode sourceAnnotation = insnNode.visibleTypeAnnotations.get(i);
TypeAnnotationNode cloneAnnotation =
new TypeAnnotationNode(
sourceAnnotation.typeRef, sourceAnnotation.typePath, sourceAnnotation.desc);
sourceAnnotation.accept(cloneAnnotation);
this.visibleTypeAnnotations.add(cloneAnnotation);
}
}
if (insnNode.invisibleTypeAnnotations != null) {
this.invisibleTypeAnnotations = new ArrayList<>();
for (int i = 0, n = insnNode.invisibleTypeAnnotations.size(); i < n; ++i) {
TypeAnnotationNode sourceAnnotation = insnNode.invisibleTypeAnnotations.get(i);
TypeAnnotationNode cloneAnnotation =
new TypeAnnotationNode(
sourceAnnotation.typeRef, sourceAnnotation.typePath, sourceAnnotation.desc);
sourceAnnotation.accept(cloneAnnotation);
this.invisibleTypeAnnotations.add(cloneAnnotation);
}
}
return this;
}
}
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