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	/*
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* 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:
	* 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 jdk.internal.org.objectweb.asm;

	/**
	* A visitor to visit a Java method. The methods of this class must be called in the following
	* order: ( {@code visitParameter} )* [ {@code visitAnnotationDefault} ] ( {@code visitAnnotation} \|
	* {@code visitAnnotableParameterCount} \| {@code visitParameterAnnotation} {@code
	* visitTypeAnnotation} \| {@code visitAttribute} )* [ {@code visitCode} ( {@code visitFrame} \|
	* {@code visit<i>X</i>Insn} \| {@code visitLabel} \| {@code visitInsnAnnotation} \| {@code
	* visitTryCatchBlock} \| {@code visitTryCatchAnnotation} \| {@code visitLocalVariable} \| {@code
	* visitLocalVariableAnnotation} \| {@code visitLineNumber} )* {@code visitMaxs} ] {@code visitEnd}.
	* In addition, the {@code visit<i>X</i>Insn} and {@code visitLabel} methods must be called in the
	* sequential order of the bytecode instructions of the visited code, {@code visitInsnAnnotation}
	* must be called <i>after</i> the annotated instruction, {@code visitTryCatchBlock} must be called
	* <i>before</i> the labels passed as arguments have been visited, {@code
	* visitTryCatchBlockAnnotation} must be called <i>after</i> the corresponding try catch block has
	* been visited, and the {@code visitLocalVariable}, {@code visitLocalVariableAnnotation} and {@code
	* visitLineNumber} methods must be called <i>after</i> the labels passed as arguments have been
	* visited.
	*
	* @author Eric Bruneton
	*/
	public abstract class MethodVisitor {

	private static final String REQUIRES_ASM5 = "This feature requires ASM5";

	/**
	* The ASM API version implemented by this visitor. The value of this field must be one of {@link
	* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
	*/
	protected final int api;

	/**
	* The method visitor to which this visitor must delegate method calls. May be {@literal null}.
	*/
	protected MethodVisitor mv;

	/**
	* Constructs a new {@link MethodVisitor}.
	*
	* @param api the ASM API version implemented by this visitor. Must be one of {@link
	* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
	*/
	public MethodVisitor(final int api) {
	this(api, null);
	}

	/**
	* Constructs a new {@link MethodVisitor}.
	*
	* @param api the ASM API version implemented by this visitor. Must be one of {@link
	* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
	* @param methodVisitor the method visitor to which this visitor must delegate method calls. May
	* be null.
	*/
	@SuppressWarnings("deprecation")
	public MethodVisitor(final int api, final MethodVisitor methodVisitor) {
	if (api != Opcodes.ASM8
	&& api != Opcodes.ASM7
	&& api != Opcodes.ASM6
	&& api != Opcodes.ASM5
	&& api != Opcodes.ASM4
	&& api != Opcodes.ASM9_EXPERIMENTAL) {
	throw new IllegalArgumentException("Unsupported api " + api);
	}
	if (api == Opcodes.ASM9_EXPERIMENTAL) {
	Constants.checkAsmExperimental(this);
	}
	this.api = api;
	this.mv = methodVisitor;
	}

	// -----------------------------------------------------------------------------------------------
	// Parameters, annotations and non standard attributes
	// -----------------------------------------------------------------------------------------------

	/**
	* Visits a parameter of this method.
	*
	* @param name parameter name or {@literal null} if none is provided.
	* @param access the parameter's access flags, only {@code ACC_FINAL}, {@code ACC_SYNTHETIC}
	* or/and {@code ACC_MANDATED} are allowed (see {@link Opcodes}).
	*/
	public void visitParameter(final String name, final int access) {
	if (api < Opcodes.ASM5) {
	throw new UnsupportedOperationException(REQUIRES_ASM5);
	}
	if (mv != null) {
	mv.visitParameter(name, access);
	}
	}

	/**
	* Visits the default value of this annotation interface method.
	*
	* @return a visitor to the visit the actual default value of this annotation interface method, or
	* {@literal null} if this visitor is not interested in visiting this default value. The
	* 'name' parameters passed to the methods of this annotation visitor are ignored. Moreover,
	* exacly one visit method must be called on this annotation visitor, followed by visitEnd.
	*/
	public AnnotationVisitor visitAnnotationDefault() {
	if (mv != null) {
	return mv.visitAnnotationDefault();
	}
	return null;
	}

	/**
	* Visits an annotation of this method.
	*
	* @param descriptor the class descriptor of the annotation class.
	* @param visible {@literal true} if the annotation is visible at runtime.
	* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
	* interested in visiting this annotation.
	*/
	public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
	if (mv != null) {
	return mv.visitAnnotation(descriptor, visible);
	}
	return null;
	}

	/**
	* Visits an annotation on a type in the method signature.
	*
	* @param typeRef a reference to the annotated type. The sort of this type reference must be
	* {@link TypeReference#METHOD_TYPE_PARAMETER}, {@link
	* TypeReference#METHOD_TYPE_PARAMETER_BOUND}, {@link TypeReference#METHOD_RETURN}, {@link
	* TypeReference#METHOD_RECEIVER}, {@link TypeReference#METHOD_FORMAL_PARAMETER} or {@link
	* TypeReference#THROWS}. See {@link TypeReference}.
	* @param typePath the path to the annotated type argument, wildcard bound, array element type, or
	* static inner type within 'typeRef'. May be {@literal null} if the annotation targets
	* 'typeRef' as a whole.
	* @param descriptor the class descriptor of the annotation class.
	* @param visible {@literal true} if the annotation is visible at runtime.
	* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
	* interested in visiting this annotation.
	*/
	public AnnotationVisitor visitTypeAnnotation(
	final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
	if (api < Opcodes.ASM5) {
	throw new UnsupportedOperationException(REQUIRES_ASM5);
	}
	if (mv != null) {
	return mv.visitTypeAnnotation(typeRef, typePath, descriptor, visible);
	}
	return null;
	}

	/**
	* Visits the number of method parameters that can have annotations. By default (i.e. when this
	* method is not called), all the method parameters defined by the method descriptor can have
	* annotations.
	*
	* @param parameterCount the number of method parameters than can have annotations. This number
	* must be less or equal than the number of parameter types in the method descriptor. It can
	* be strictly less when a method has synthetic parameters and when these parameters are
	* ignored when computing parameter indices for the purpose of parameter annotations (see
	* https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.7.18).
	* @param visible {@literal true} to define the number of method parameters that can have
	* annotations visible at runtime, {@literal false} to define the number of method parameters
	* that can have annotations invisible at runtime.
	*/
	public void visitAnnotableParameterCount(final int parameterCount, final boolean visible) {
	if (mv != null) {
	mv.visitAnnotableParameterCount(parameterCount, visible);
	}
	}

	/**
	* Visits an annotation of a parameter this method.
	*
	* @param parameter the parameter index. This index must be strictly smaller than the number of
	* parameters in the method descriptor, and strictly smaller than the parameter count
	* specified in {@link #visitAnnotableParameterCount}. Important note: <i>a parameter index i
	* is not required to correspond to the i'th parameter descriptor in the method
	* descriptor</i>, in particular in case of synthetic parameters (see
	* https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.7.18).
	* @param descriptor the class descriptor of the annotation class.
	* @param visible {@literal true} if the annotation is visible at runtime.
	* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
	* interested in visiting this annotation.
	*/
	public AnnotationVisitor visitParameterAnnotation(
	final int parameter, final String descriptor, final boolean visible) {
	if (mv != null) {
	return mv.visitParameterAnnotation(parameter, descriptor, visible);
	}
	return null;
	}

	/**
	* Visits a non standard attribute of this method.
	*
	* @param attribute an attribute.
	*/
	public void visitAttribute(final Attribute attribute) {
	if (mv != null) {
	mv.visitAttribute(attribute);
	}
	}

	/** Starts the visit of the method's code, if any (i.e. non abstract method). */
	public void visitCode() {
	if (mv != null) {
	mv.visitCode();
	}
	}

	/**
	* Visits the current state of the local variables and operand stack elements. This method must(*)
	* be called <i>just before</i> any instruction <b>i</b> that follows an unconditional branch
	* instruction such as GOTO or THROW, that is the target of a jump instruction, or that starts an
	* exception handler block. The visited 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}. <br>
	* <br>
	* The frames of a method must be given either in expanded form, or in compressed form (all frames
	* must use the same format, i.e. you must not mix expanded and compressed frames within a single
	* method):
	*
	* <ul>
	* <li>In expanded form, all frames must have the F_NEW type.
	* <li>In compressed form, frames are basically "deltas" from the state of the previous frame:
	* <ul>
	* <li>{@link Opcodes#F_SAME} representing frame with exactly the same locals as the
	* previous frame and with the empty stack.
	* <li>{@link Opcodes#F_SAME1} representing frame with exactly the same locals as the
	* previous frame and with single value on the stack ( <code>numStack</code> is 1 and
	* <code>stack[0]</code> contains value for the type of the stack item).
	* <li>{@link Opcodes#F_APPEND} representing frame with current locals are the same as the
	* locals in the previous frame, except that additional locals are defined (<code>
	* numLocal</code> is 1, 2 or 3 and <code>local</code> elements contains values
	* representing added types).
	* <li>{@link Opcodes#F_CHOP} representing frame with current locals are the same as the
	* locals in the previous frame, except that the last 1-3 locals are absent and with
	* the empty stack (<code>numLocal</code> is 1, 2 or 3).
	* <li>{@link Opcodes#F_FULL} representing complete frame data.
	* </ul>
	* </ul>
	*
	* <br>
	* In both cases the first frame, corresponding to the method's parameters and access flags, is
	* implicit and must not be visited. Also, it is illegal to visit two or more frames for the same
	* code location (i.e., at least one instruction must be visited between two calls to visitFrame).
	*
	* @param type the type of this stack map 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 numLocal the number of local variables in the visited frame.
	* @param local the local variable types in this frame. This array must not be modified. Primitive
	* types are represented by {@link Opcodes#TOP}, {@link Opcodes#INTEGER}, {@link
	* Opcodes#FLOAT}, {@link Opcodes#LONG}, {@link Opcodes#DOUBLE}, {@link Opcodes#NULL} or
	* {@link Opcodes#UNINITIALIZED_THIS} (long and double are represented by a single element).
	* Reference types are represented by String objects (representing internal names), and
	* uninitialized types by Label objects (this label designates the NEW instruction that
	* created this uninitialized value).
	* @param numStack the number of operand stack elements in the visited frame.
	* @param stack the operand stack types in this frame. This array must not be modified. Its
	* content has the same format as the "local" array.
	* @throws IllegalStateException if a frame is visited just after another one, without any
	* instruction between the two (unless this frame is a Opcodes#F_SAME frame, in which case it
	* is silently ignored).
	*/
	public void visitFrame(
	final int type,
	final int numLocal,
	final Object[] local,
	final int numStack,
	final Object[] stack) {
	if (mv != null) {
	mv.visitFrame(type, numLocal, local, numStack, stack);
	}
	}

	// -----------------------------------------------------------------------------------------------
	// Normal instructions
	// -----------------------------------------------------------------------------------------------

	/**
	* Visits a zero operand instruction.
	*
	* @param opcode the opcode of the instruction to be visited. This opcode is either NOP,
	* ACONST_NULL, ICONST_M1, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5,
	* LCONST_0, LCONST_1, FCONST_0, FCONST_1, FCONST_2, DCONST_0, DCONST_1, IALOAD, LALOAD,
	* FALOAD, DALOAD, AALOAD, BALOAD, CALOAD, SALOAD, IASTORE, LASTORE, FASTORE, DASTORE,
	* AASTORE, BASTORE, CASTORE, SASTORE, POP, POP2, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2,
	* SWAP, IADD, LADD, FADD, DADD, ISUB, LSUB, FSUB, DSUB, IMUL, LMUL, FMUL, DMUL, IDIV, LDIV,
	* FDIV, DDIV, IREM, LREM, FREM, DREM, INEG, LNEG, FNEG, DNEG, ISHL, LSHL, ISHR, LSHR, IUSHR,
	* LUSHR, IAND, LAND, IOR, LOR, IXOR, LXOR, I2L, I2F, I2D, L2I, L2F, L2D, F2I, F2L, F2D, D2I,
	* D2L, D2F, I2B, I2C, I2S, LCMP, FCMPL, FCMPG, DCMPL, DCMPG, IRETURN, LRETURN, FRETURN,
	* DRETURN, ARETURN, RETURN, ARRAYLENGTH, ATHROW, MONITORENTER, or MONITOREXIT.
	*/
	public void visitInsn(final int opcode) {
	if (mv != null) {
	mv.visitInsn(opcode);
	}
	}

	/**
	* Visits an instruction with a single int operand.
	*
	* @param opcode the opcode of the instruction to be visited. This opcode is either BIPUSH, SIPUSH
	* or NEWARRAY.
	* @param operand the operand of the instruction to be visited.<br>
	* When opcode is BIPUSH, operand value should be between Byte.MIN_VALUE and Byte.MAX_VALUE.
	* <br>
	* When opcode is SIPUSH, operand value should be between Short.MIN_VALUE and Short.MAX_VALUE.
	* <br>
	* When opcode is NEWARRAY, operand value should be one of {@link Opcodes#T_BOOLEAN}, {@link
	* Opcodes#T_CHAR}, {@link Opcodes#T_FLOAT}, {@link Opcodes#T_DOUBLE}, {@link Opcodes#T_BYTE},
	* {@link Opcodes#T_SHORT}, {@link Opcodes#T_INT} or {@link Opcodes#T_LONG}.
	*/
	public void visitIntInsn(final int opcode, final int operand) {
	if (mv != null) {
	mv.visitIntInsn(opcode, operand);
	}
	}

	/**
	* Visits a local variable instruction. A local variable instruction is an instruction that loads
	* or stores the value of a local variable.
	*
	* @param opcode the opcode of the local variable instruction to be visited. This opcode is either
	* ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE or RET.
	* @param var the operand of the instruction to be visited. This operand is the index of a local
	* variable.
	*/
	public void visitVarInsn(final int opcode, final int var) {
	if (mv != null) {
	mv.visitVarInsn(opcode, var);
	}
	}

	/**
	* Visits a type instruction. A type instruction is an instruction that takes the internal name of
	* a class as parameter.
	*
	* @param opcode the opcode of the type instruction to be visited. This opcode is either NEW,
	* ANEWARRAY, CHECKCAST or INSTANCEOF.
	* @param type the operand of the instruction to be visited. This operand must be the internal
	* name of an object or array class (see {@link Type#getInternalName()}).
	*/
	public void visitTypeInsn(final int opcode, final String type) {
	if (mv != null) {
	mv.visitTypeInsn(opcode, type);
	}
	}

	/**
	* Visits a field instruction. A field instruction is an instruction that loads or stores the
	* value of a field of an object.
	*
	* @param opcode the opcode of the type instruction to be visited. This opcode is either
	* GETSTATIC, PUTSTATIC, GETFIELD or PUTFIELD.
	* @param owner the internal name of the field's owner class (see {@link Type#getInternalName()}).
	* @param name the field's name.
	* @param descriptor the field's descriptor (see {@link Type}).
	*/
	public void visitFieldInsn(
	final int opcode, final String owner, final String name, final String descriptor) {
	if (mv != null) {
	mv.visitFieldInsn(opcode, owner, name, descriptor);
	}
	}

	/**
	* Visits a method instruction. A method instruction is an instruction that invokes a method.
	*
	* @param opcode the opcode of the type instruction to be visited. This opcode is either
	* INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or INVOKEINTERFACE.
	* @param owner the internal name of the method's owner class (see {@link
	* Type#getInternalName()}).
	* @param name the method's name.
	* @param descriptor the method's descriptor (see {@link Type}).
	* @deprecated use {@link #visitMethodInsn(int, String, String, String, boolean)} instead.
	*/
	@Deprecated
	public void visitMethodInsn(
	final int opcode, final String owner, final String name, final String descriptor) {
	int opcodeAndSource = opcode \| (api < Opcodes.ASM5 ? Opcodes.SOURCE_DEPRECATED : 0);
	visitMethodInsn(opcodeAndSource, owner, name, descriptor, opcode == Opcodes.INVOKEINTERFACE);
	}

	/**
	* Visits a method instruction. A method instruction is an instruction that invokes a method.
	*
	* @param opcode the opcode of the type instruction to be visited. This opcode is either
	* INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or INVOKEINTERFACE.
	* @param owner the internal name of the method's owner class (see {@link
	* Type#getInternalName()}).
	* @param name the method's name.
	* @param descriptor the method's descriptor (see {@link Type}).
	* @param isInterface if the method's owner class is an interface.
	*/
	public void visitMethodInsn(
	final int opcode,
	final String owner,
	final String name,
	final String descriptor,
	final boolean isInterface) {
	if (api < Opcodes.ASM5 && (opcode & Opcodes.SOURCE_DEPRECATED) == 0) {
	if (isInterface != (opcode == Opcodes.INVOKEINTERFACE)) {
	throw new UnsupportedOperationException("INVOKESPECIAL/STATIC on interfaces requires ASM5");
	}
	visitMethodInsn(opcode, owner, name, descriptor);
	return;
	}
	if (mv != null) {
	mv.visitMethodInsn(opcode & ~Opcodes.SOURCE_MASK, owner, name, descriptor, isInterface);
	}
	}

	/**
	* Visits an invokedynamic instruction.
	*
	* @param name the method's name.
	* @param descriptor the method's descriptor (see {@link Type}).
	* @param bootstrapMethodHandle the bootstrap method.
	* @param bootstrapMethodArguments the bootstrap method constant arguments. Each argument must be
	* an {@link Integer}, {@link Float}, {@link Long}, {@link Double}, {@link String}, {@link
	* Type}, {@link Handle} or {@link ConstantDynamic} value. This method is allowed to modify
	* the content of the array so a caller should expect that this array may change.
	*/
	public void visitInvokeDynamicInsn(
	final String name,
	final String descriptor,
	final Handle bootstrapMethodHandle,
	final Object... bootstrapMethodArguments) {
	if (api < Opcodes.ASM5) {
	throw new UnsupportedOperationException(REQUIRES_ASM5);
	}
	if (mv != null) {
	mv.visitInvokeDynamicInsn(name, descriptor, bootstrapMethodHandle, bootstrapMethodArguments);
	}
	}

	/**
	* Visits a jump instruction. A jump instruction is an instruction that may jump to another
	* instruction.
	*
	* @param opcode the opcode of the type instruction to be visited. This opcode is either IFEQ,
	* IFNE, IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ, IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT,
	* IF_ICMPLE, IF_ACMPEQ, IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.
	* @param label the operand of the instruction to be visited. This operand is a label that
	* designates the instruction to which the jump instruction may jump.
	*/
	public void visitJumpInsn(final int opcode, final Label label) {
	if (mv != null) {
	mv.visitJumpInsn(opcode, label);
	}
	}

	/**
	* Visits a label. A label designates the instruction that will be visited just after it.
	*
	* @param label a {@link Label} object.
	*/
	public void visitLabel(final Label label) {
	if (mv != null) {
	mv.visitLabel(label);
	}
	}

	// -----------------------------------------------------------------------------------------------
	// Special instructions
	// -----------------------------------------------------------------------------------------------

	/**
	* Visits a LDC instruction. Note that new constant types may be added in future versions of the
	* Java Virtual Machine. To easily detect new constant types, implementations of this method
	* should check for unexpected constant types, like this:
	*
	* <pre>
	* if (cst instanceof Integer) {
	* // ...
	* } else if (cst instanceof Float) {
	* // ...
	* } else if (cst instanceof Long) {
	* // ...
	* } else if (cst instanceof Double) {
	* // ...
	* } else if (cst instanceof String) {
	* // ...
	* } else if (cst instanceof Type) {
	* int sort = ((Type) cst).getSort();
	* if (sort == Type.OBJECT) {
	* // ...
	* } else if (sort == Type.ARRAY) {
	* // ...
	* } else if (sort == Type.METHOD) {
	* // ...
	* } else {
	* // throw an exception
	* }
	* } else if (cst instanceof Handle) {
	* // ...
	* } else if (cst instanceof ConstantDynamic) {
	* // ...
	* } else {
	* // throw an exception
	* }
	* </pre>
	*
	* @param value the constant to be loaded on the stack. This parameter must be a non null {@link
	* Integer}, a {@link Float}, a {@link Long}, a {@link Double}, a {@link String}, a {@link
	* Type} of OBJECT or ARRAY sort for {@code .class} constants, for classes whose version is
	* 49, a {@link Type} of METHOD sort for MethodType, a {@link Handle} for MethodHandle
	* constants, for classes whose version is 51 or a {@link ConstantDynamic} for a constant
	* dynamic for classes whose version is 55.
	*/
	public void visitLdcInsn(final Object value) {
	if (api < Opcodes.ASM5
	&& (value instanceof Handle
	\|\| (value instanceof Type && ((Type) value).getSort() == Type.METHOD))) {
	throw new UnsupportedOperationException(REQUIRES_ASM5);
	}
	if (api < Opcodes.ASM7 && value instanceof ConstantDynamic) {
	throw new UnsupportedOperationException("This feature requires ASM7");
	}
	if (mv != null) {
	mv.visitLdcInsn(value);
	}
	}

	/**
	* Visits an IINC instruction.
	*
	* @param var index of the local variable to be incremented.
	* @param increment amount to increment the local variable by.
	*/
	public void visitIincInsn(final int var, final int increment) {
	if (mv != null) {
	mv.visitIincInsn(var, increment);
	}
	}

	/**
	* Visits a TABLESWITCH instruction.
	*
	* @param min the minimum key value.
	* @param max the maximum key value.
	* @param dflt beginning of the default handler block.
	* @param labels beginnings of the handler blocks. {@code labels[i]} is the beginning of the
	* handler block for the {@code min + i} key.
	*/
	public void visitTableSwitchInsn(
	final int min, final int max, final Label dflt, final Label... labels) {
	if (mv != null) {
	mv.visitTableSwitchInsn(min, max, dflt, labels);
	}
	}

	/**
	* Visits a LOOKUPSWITCH instruction.
	*
	* @param dflt beginning of the default handler block.
	* @param keys the values of the keys.
	* @param labels beginnings of the handler blocks. {@code labels[i]} is the beginning of the
	* handler block for the {@code keys[i]} key.
	*/
	public void visitLookupSwitchInsn(final Label dflt, final int[] keys, final Label[] labels) {
	if (mv != null) {
	mv.visitLookupSwitchInsn(dflt, keys, labels);
	}
	}

	/**
	* Visits a MULTIANEWARRAY instruction.
	*
	* @param descriptor an array type descriptor (see {@link Type}).
	* @param numDimensions the number of dimensions of the array to allocate.
	*/
	public void visitMultiANewArrayInsn(final String descriptor, final int numDimensions) {
	if (mv != null) {
	mv.visitMultiANewArrayInsn(descriptor, numDimensions);
	}
	}

	/**
	* Visits an annotation on an instruction. This method must be called just <i>after</i> the
	* annotated instruction. It can be called several times for the same instruction.
	*
	* @param typeRef a reference to the annotated type. The sort of this type reference must be
	* {@link TypeReference#INSTANCEOF}, {@link TypeReference#NEW}, {@link
	* TypeReference#CONSTRUCTOR_REFERENCE}, {@link TypeReference#METHOD_REFERENCE}, {@link
	* TypeReference#CAST}, {@link TypeReference#CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT}, {@link
	* TypeReference#METHOD_INVOCATION_TYPE_ARGUMENT}, {@link
	* TypeReference#CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT}, or {@link
	* TypeReference#METHOD_REFERENCE_TYPE_ARGUMENT}. See {@link TypeReference}.
	* @param typePath the path to the annotated type argument, wildcard bound, array element type, or
	* static inner type within 'typeRef'. May be {@literal null} if the annotation targets
	* 'typeRef' as a whole.
	* @param descriptor the class descriptor of the annotation class.
	* @param visible {@literal true} if the annotation is visible at runtime.
	* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
	* interested in visiting this annotation.
	*/
	public AnnotationVisitor visitInsnAnnotation(
	final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
	if (api < Opcodes.ASM5) {
	throw new UnsupportedOperationException(REQUIRES_ASM5);
	}
	if (mv != null) {
	return mv.visitInsnAnnotation(typeRef, typePath, descriptor, visible);
	}
	return null;
	}

	// -----------------------------------------------------------------------------------------------
	// Exceptions table entries, debug information, max stack and max locals
	// -----------------------------------------------------------------------------------------------

	/**
	* Visits a try catch block.
	*
	* @param start the beginning of the exception handler's scope (inclusive).
	* @param end the end of the exception handler's scope (exclusive).
	* @param handler the beginning of the exception handler's code.
	* @param type the internal name of the type of exceptions handled by the handler, or {@literal
	* null} to catch any exceptions (for "finally" blocks).
	* @throws IllegalArgumentException if one of the labels has already been visited by this visitor
	* (by the {@link #visitLabel} method).
	*/
	public void visitTryCatchBlock(
	final Label start, final Label end, final Label handler, final String type) {
	if (mv != null) {
	mv.visitTryCatchBlock(start, end, handler, type);
	}
	}

	/**
	* Visits an annotation on an exception handler type. This method must be called <i>after</i> the
	* {@link #visitTryCatchBlock} for the annotated exception handler. It can be called several times
	* for the same exception handler.
	*
	* @param typeRef a reference to the annotated type. The sort of this type reference must be
	* {@link TypeReference#EXCEPTION_PARAMETER}. See {@link TypeReference}.
	* @param typePath the path to the annotated type argument, wildcard bound, array element type, or
	* static inner type within 'typeRef'. May be {@literal null} if the annotation targets
	* 'typeRef' as a whole.
	* @param descriptor the class descriptor of the annotation class.
	* @param visible {@literal true} if the annotation is visible at runtime.
	* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
	* interested in visiting this annotation.
	*/
	public AnnotationVisitor visitTryCatchAnnotation(
	final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
	if (api < Opcodes.ASM5) {
	throw new UnsupportedOperationException(REQUIRES_ASM5);
	}
	if (mv != null) {
	return mv.visitTryCatchAnnotation(typeRef, typePath, descriptor, visible);
	}
	return null;
	}

	/**
	* Visits a local variable declaration.
	*
	* @param name the name of a local variable.
	* @param descriptor the type descriptor of this local variable.
	* @param signature the type signature of this local variable. May be {@literal null} if the local
	* variable type does not use generic types.
	* @param start the first instruction corresponding to the scope of this local variable
	* (inclusive).
	* @param end the last instruction corresponding to the scope of this local variable (exclusive).
	* @param index the local variable's index.
	* @throws IllegalArgumentException if one of the labels has not already been visited by this
	* visitor (by the {@link #visitLabel} method).
	*/
	public void visitLocalVariable(
	final String name,
	final String descriptor,
	final String signature,
	final Label start,
	final Label end,
	final int index) {
	if (mv != null) {
	mv.visitLocalVariable(name, descriptor, signature, start, end, index);
	}
	}

	/**
	* Visits an annotation on a local variable type.
	*
	* @param typeRef a reference to the annotated type. The sort of this type reference must be
	* {@link TypeReference#LOCAL_VARIABLE} or {@link TypeReference#RESOURCE_VARIABLE}. See {@link
	* TypeReference}.
	* @param typePath the path to the annotated type argument, wildcard bound, array element type, or
	* static inner type within 'typeRef'. May be {@literal null} if the annotation targets
	* 'typeRef' as a whole.
	* @param start the fist instructions corresponding to the continuous ranges that make the scope
	* of this local variable (inclusive).
	* @param end the last instructions corresponding to the continuous ranges that make the scope of
	* this local variable (exclusive). This array must have the same size as the 'start' array.
	* @param index the local variable's index in each range. This array must have the same size as
	* the 'start' array.
	* @param descriptor the class descriptor of the annotation class.
	* @param visible {@literal true} if the annotation is visible at runtime.
	* @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
	* interested in visiting this annotation.
	*/
	public AnnotationVisitor visitLocalVariableAnnotation(
	final int typeRef,
	final TypePath typePath,
	final Label[] start,
	final Label[] end,
	final int[] index,
	final String descriptor,
	final boolean visible) {
	if (api < Opcodes.ASM5) {
	throw new UnsupportedOperationException(REQUIRES_ASM5);
	}
	if (mv != null) {
	return mv.visitLocalVariableAnnotation(
	typeRef, typePath, start, end, index, descriptor, visible);
	}
	return null;
	}

	/**
	* Visits a line number declaration.
	*
	* @param line a line number. This number refers to the source file from which the class was
	* compiled.
	* @param start the first instruction corresponding to this line number.
	* @throws IllegalArgumentException if {@code start} has not already been visited by this visitor
	* (by the {@link #visitLabel} method).
	*/
	public void visitLineNumber(final int line, final Label start) {
	if (mv != null) {
	mv.visitLineNumber(line, start);
	}
	}

	/**
	* Visits the maximum stack size and the maximum number of local variables of the method.
	*
	* @param maxStack maximum stack size of the method.
	* @param maxLocals maximum number of local variables for the method.
	*/
	public void visitMaxs(final int maxStack, final int maxLocals) {
	if (mv != null) {
	mv.visitMaxs(maxStack, maxLocals);
	}
	}

	/**
	* Visits the end of the method. This method, which is the last one to be called, is used to
	* inform the visitor that all the annotations and attributes of the method have been visited.
	*/
	public void visitEnd() {
	if (mv != null) {
	mv.visitEnd();
	}
	}
	}

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