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With inspiration from other libraries
// 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.mvel2.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 visitXInsn} | {@code visitLabel} | {@code visitInsnAnnotation} | {@code
* visitTryCatchBlock} | {@code visitTryCatchAnnotation} | {@code visitLocalVariable} | {@code
* visitLocalVariableAnnotation} | {@code visitLineNumber} )* {@code visitMaxs} ] {@code visitEnd}.
* In addition, the {@code visitXInsn} and {@code visitLabel} methods must be called in the
* sequential order of the bytecode instructions of the visited code, {@code visitInsnAnnotation}
* must be called after the annotated instruction, {@code visitTryCatchBlock} must be called
* before the labels passed as arguments have been visited, {@code
* visitTryCatchBlockAnnotation} must be called after the corresponding try catch block has
* been visited, and the {@code visitLocalVariable}, {@code visitLocalVariableAnnotation} and {@code
* visitLineNumber} methods must be called after 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 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.
*/
public MethodVisitor(final int api, final MethodVisitor methodVisitor) {
if (api != Opcodes.ASM6 && api != Opcodes.ASM5 && api != Opcodes.ASM4 && api != Opcodes.ASM7) {
throw new IllegalArgumentException();
}
this.api = api;
this.mv = methodVisitor;
}
// -----------------------------------------------------------------------------------------------
// Parameters, annotations and non standard attributes
// -----------------------------------------------------------------------------------------------
/**
* Visits a parameter of this method.
*
* @param name parameter name or 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: a parameter index i
* is not required to correspond to the i'th parameter descriptor in the method
* descriptor, 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 just before any instruction i 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 just before i is executed.
*
* (*) this is mandatory only for classes whose version is greater than or equal to {@link
* Opcodes#V1_6}.
*
* 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):
*
*
* - In expanded form, all frames must have the F_NEW type.
*
- In compressed form, frames are basically "deltas" from the state of the previous frame:
*
* - {@link Opcodes#F_SAME} representing frame with exactly the same locals as the
* previous frame and with the empty stack.
*
- {@link Opcodes#F_SAME1} representing frame with exactly the same locals as the
* previous frame and with single value on the stack (
numStack is 1 and
* stack[0] contains value for the type of the stack item).
* - {@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 (
* numLocal is 1, 2 or 3 and local elements contains values
* representing added types).
* - {@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 (
numLocal is 1, 2 or 3).
* - {@link Opcodes#F_FULL} representing complete frame data.
*
*
*
*
* 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.
* When opcode is BIPUSH, operand value should be between Byte.MIN_VALUE and Byte.MAX_VALUE.
*
* When opcode is SIPUSH, operand value should be between Short.MIN_VALUE and Short.MAX_VALUE.
*
* 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) {
if (api >= Opcodes.ASM5) {
boolean isInterface = opcode == Opcodes.INVOKEINTERFACE;
visitMethodInsn(opcode, owner, name, descriptor, isInterface);
return;
}
if (mv != null) {
mv.visitMethodInsn(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}).
* @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) {
if (isInterface != (opcode == Opcodes.INVOKEINTERFACE)) {
throw new IllegalArgumentException("INVOKESPECIAL/STATIC on interfaces requires ASM5");
}
visitMethodInsn(opcode, owner, name, descriptor);
return;
}
if (mv != null) {
mv.visitMethodInsn(opcode, 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:
*
*
* 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
* }
*
*
* @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 after 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 after 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();
}
}
}