Package org.objectweb.asm.util

Class CheckMethodAdapter

  • public class CheckMethodAdapter
extends MethodVisitor
    A MethodVisitor that checks that its methods are properly used. More precisely this method adapter checks each instruction individually, i.e., each visit method checks some preconditions based only on its arguments - such as the fact that the given opcode is correct for a given visit method. This adapter can also perform some basic data flow checks (more precisely those that can be performed without the full class hierarchy - see BasicVerifier). For instance in a method whose signature is void m (), the invalid instruction IRETURN, or the invalid sequence IADD L2I will be detected if the data flow checks are enabled. These checks are enabled by using the CheckMethodAdapter(int,String,String,MethodVisitor,Map) constructor. They are not performed if any other constructor is used.

    • Field Detail

      • OPCODE_METHODS

        private static final CheckMethodAdapter.Method[] OPCODE_METHODS
        The method to use to visit each instruction. Only generic methods are represented here.

      • INVALID_DESCRIPTOR

        private static final java.lang.String INVALID_DESCRIPTOR
        See Also:
        Constant Field Values

      • INVALID_TYPE_REFERENCE

        private static final java.lang.String INVALID_TYPE_REFERENCE
        See Also:
        Constant Field Values

      • INVALID_LOCAL_VARIABLE_INDEX

        private static final java.lang.String INVALID_LOCAL_VARIABLE_INDEX
        See Also:
        Constant Field Values

      • MUST_NOT_BE_NULL_OR_EMPTY

        private static final java.lang.String MUST_NOT_BE_NULL_OR_EMPTY
        See Also:
        Constant Field Values

      • version

        public int version
        The class version number.

      • access

        private int access
        The access flags of the visited method.

      • visibleAnnotableParameterCount

        private int visibleAnnotableParameterCount
        The number of method parameters that can have runtime visible annotations. 0 means that all the parameters from the method descriptor can have annotations.

      • invisibleAnnotableParameterCount

        private int invisibleAnnotableParameterCount
        The number of method parameters that can have runtime invisible annotations. 0 means that all the parameters from the method descriptor can have annotations.

      • visitCodeCalled

        private boolean visitCodeCalled
        Whether the visitCode() method has been called.

      • visitMaxCalled

        private boolean visitMaxCalled
        Whether the visitMaxs(int, int) method has been called.

      • visitEndCalled

        private boolean visitEndCalled
        Whether the visitEnd() method has been called.

      • insnCount

        private int insnCount
        The number of visited instructions so far.

      • labelInsnIndices

        private final java.util.Map<Label,​java.lang.Integer> labelInsnIndices
        The index of the instruction designated by each visited label.

      • referencedLabels

        private java.util.Set<Label> referencedLabels
        The labels referenced by the visited method.

      • lastFrameInsnIndex

        private int lastFrameInsnIndex
        The index of the instruction corresponding to the last visited stack map frame.

      • numExpandedFrames

        private int numExpandedFrames
        The number of visited frames in expanded form.

      • numCompressedFrames

        private int numCompressedFrames
        The number of visited frames in compressed form.

      • handlers

        private java.util.List<Label> handlers
        The exception handler ranges. Each pair of list element contains the start and end labels of an exception handler block.

    • Constructor Detail

      • CheckMethodAdapter

        public CheckMethodAdapter​(MethodVisitor methodVisitor,
                          java.util.Map<Label,​java.lang.Integer> labelInsnIndices)
        Constructs a new CheckMethodAdapter object. This method adapter will not perform any data flow check (see CheckMethodAdapter(int,String,String,MethodVisitor,Map)). Subclasses must not use this constructor. Instead, they must use the CheckMethodAdapter(int, MethodVisitor, Map) version.
        Parameters:
        methodVisitor - the method visitor to which this adapter must delegate calls.
        labelInsnIndices - the index of the instruction designated by each visited label so far (in other methods). This map is updated with the labels from the visited method.
        Throws:
        java.lang.IllegalStateException - If a subclass calls this constructor.

      • CheckMethodAdapter

        protected CheckMethodAdapter​(int api,
                             MethodVisitor methodVisitor,
                             java.util.Map<Label,​java.lang.Integer> labelInsnIndices)
        Constructs a new CheckMethodAdapter object. This method adapter will not perform any data flow check (see CheckMethodAdapter(int,String,String,MethodVisitor,Map)).
        Parameters:
        api - the ASM API version implemented by this CheckMethodAdapter. Must be one of Opcodes.ASM4, Opcodes.ASM5, Opcodes.ASM6 or Opcodes.ASM7.
        methodVisitor - the method visitor to which this adapter must delegate calls.
        labelInsnIndices - the index of the instruction designated by each visited label so far (in other methods). This map is updated with the labels from the visited method.

      • CheckMethodAdapter

        public CheckMethodAdapter​(int access,
                          java.lang.String name,
                          java.lang.String descriptor,
                          MethodVisitor methodVisitor,
                          java.util.Map<Label,​java.lang.Integer> labelInsnIndices)
        Constructs a new CheckMethodAdapter object. This method adapter will perform basic data flow checks. For instance in a method whose signature is void m (), the invalid instruction IRETURN, or the invalid sequence IADD L2I will be detected. Subclasses must not use this constructor. Instead, they must use the CheckMethodAdapter(int,int,String,String,MethodVisitor,Map) version.
        Parameters:
        access - the method's access flags.
        name - the method's name.
        descriptor - the method's descriptor (see Type).
        methodVisitor - the method visitor to which this adapter must delegate calls.
        labelInsnIndices - the index of the instruction designated by each visited label so far (in other methods). This map is updated with the labels from the visited method.

      • CheckMethodAdapter

        protected CheckMethodAdapter​(int api,
                             int access,
                             java.lang.String name,
                             java.lang.String descriptor,
                             MethodVisitor methodVisitor,
                             java.util.Map<Label,​java.lang.Integer> labelInsnIndices)
        Constructs a new CheckMethodAdapter object. This method adapter will perform basic data flow checks. For instance in a method whose signature is void m (), the invalid instruction IRETURN, or the invalid sequence IADD L2I will be detected.
        Parameters:
        api - the ASM API version implemented by this CheckMethodAdapter. Must be one of Opcodes.ASM4, Opcodes.ASM5, Opcodes.ASM6 or Opcodes.ASM7.
        access - the method's access flags.
        name - the method's name.
        descriptor - the method's descriptor (see Type).
        methodVisitor - the method visitor to which this adapter must delegate calls.
        labelInsnIndices - the index of the instruction designated by each visited label so far (in other methods). This map is updated with the labels from the visited method.

    • Method Detail

      • visitParameter

        public void visitParameter​(java.lang.String name,
                           int access)
        Description copied from class: MethodVisitor
        Visits a parameter of this method.
        Overrides:
        visitParameter in class MethodVisitor
        Parameters:
        name - parameter name or null if none is provided.
        access - the parameter's access flags, only ACC_FINAL, ACC_SYNTHETIC or/and ACC_MANDATED are allowed (see Opcodes).

      • visitAnnotation

        public AnnotationVisitor visitAnnotation​(java.lang.String descriptor,
                                         boolean visible)
        Description copied from class: MethodVisitor
        Visits an annotation of this method.
        Overrides:
        visitAnnotation in class MethodVisitor
        Parameters:
        descriptor - the class descriptor of the annotation class.
        visible - true if the annotation is visible at runtime.
        Returns:
        a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

      • visitAnnotationDefault

        public AnnotationVisitor visitAnnotationDefault()
        Description copied from class: MethodVisitor
        Visits the default value of this annotation interface method.
        Overrides:
        visitAnnotationDefault in class MethodVisitor
        Returns:
        a visitor to the visit the actual default value of this annotation interface method, or 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.

      • visitAnnotableParameterCount

        public void visitAnnotableParameterCount​(int parameterCount,
                                         boolean visible)
        Description copied from class: MethodVisitor
        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.
        Overrides:
        visitAnnotableParameterCount in class MethodVisitor
        Parameters:
        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).
        visible - true to define the number of method parameters that can have annotations visible at runtime, false to define the number of method parameters that can have annotations invisible at runtime.

      • visitParameterAnnotation

        public AnnotationVisitor visitParameterAnnotation​(int parameter,
                                                  java.lang.String descriptor,
                                                  boolean visible)
        Description copied from class: MethodVisitor
        Visits an annotation of a parameter this method.
        Overrides:
        visitParameterAnnotation in class MethodVisitor
        Parameters:
        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 MethodVisitor.visitAnnotableParameterCount(int, boolean). 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).
        descriptor - the class descriptor of the annotation class.
        visible - true if the annotation is visible at runtime.
        Returns:
        a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

      • visitAttribute

        public void visitAttribute​(Attribute attribute)
        Description copied from class: MethodVisitor
        Visits a non standard attribute of this method.
        Overrides:
        visitAttribute in class MethodVisitor
        Parameters:
        attribute - an attribute.

      • visitCode

        public void visitCode()
        Description copied from class: MethodVisitor
        Starts the visit of the method's code, if any (i.e. non abstract method).
        Overrides:
        visitCode in class MethodVisitor

      • visitFrame

        public void visitFrame​(int type,
                       int numLocal,
                       java.lang.Object[] local,
                       int numStack,
                       java.lang.Object[] stack)
        Description copied from class: MethodVisitor
        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 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:
          • Opcodes.F_SAME representing frame with exactly the same locals as the previous frame and with the empty stack.
          • 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).
          • 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).
          • 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).
          • 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).
        Overrides:
        visitFrame in class MethodVisitor
        Parameters:
        type - the type of this stack map frame. Must be Opcodes.F_NEW for expanded frames, or Opcodes.F_FULL, Opcodes.F_APPEND, Opcodes.F_CHOP, Opcodes.F_SAME or Opcodes.F_APPEND, Opcodes.F_SAME1 for compressed frames.
        numLocal - the number of local variables in the visited frame.
        local - the local variable types in this frame. This array must not be modified. Primitive types are represented by Opcodes.TOP, Opcodes.INTEGER, Opcodes.FLOAT, Opcodes.LONG, Opcodes.DOUBLE, Opcodes.NULL or 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).
        numStack - the number of operand stack elements in the visited frame.
        stack - the operand stack types in this frame. This array must not be modified. Its content has the same format as the "local" array.

      • visitInsn

        public void visitInsn​(int opcode)
        Description copied from class: MethodVisitor
        Visits a zero operand instruction.
        Overrides:
        visitInsn in class MethodVisitor
        Parameters:
        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.

      • visitVarInsn

        public void visitVarInsn​(int opcode,
                         int var)
        Description copied from class: MethodVisitor
        Visits a local variable instruction. A local variable instruction is an instruction that loads or stores the value of a local variable.
        Overrides:
        visitVarInsn in class MethodVisitor
        Parameters:
        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.
        var - the operand of the instruction to be visited. This operand is the index of a local variable.

      • visitTypeInsn

        public void visitTypeInsn​(int opcode,
                          java.lang.String type)
        Description copied from class: MethodVisitor
        Visits a type instruction. A type instruction is an instruction that takes the internal name of a class as parameter.
        Overrides:
        visitTypeInsn in class MethodVisitor
        Parameters:
        opcode - the opcode of the type instruction to be visited. This opcode is either NEW, ANEWARRAY, CHECKCAST or INSTANCEOF.
        type - the operand of the instruction to be visited. This operand must be the internal name of an object or array class (see Type.getInternalName()).

      • visitFieldInsn

        public void visitFieldInsn​(int opcode,
                           java.lang.String owner,
                           java.lang.String name,
                           java.lang.String descriptor)
        Description copied from class: MethodVisitor
        Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object.
        Overrides:
        visitFieldInsn in class MethodVisitor
        Parameters:
        opcode - the opcode of the type instruction to be visited. This opcode is either GETSTATIC, PUTSTATIC, GETFIELD or PUTFIELD.
        owner - the internal name of the field's owner class (see Type.getInternalName()).
        name - the field's name.
        descriptor - the field's descriptor (see Type).

      • visitMethodInsn

        public void visitMethodInsn​(int opcodeAndSource,
                            java.lang.String owner,
                            java.lang.String name,
                            java.lang.String descriptor,
                            boolean isInterface)
        Description copied from class: MethodVisitor
        Visits a method instruction. A method instruction is an instruction that invokes a method.
        Overrides:
        visitMethodInsn in class MethodVisitor
        Parameters:
        opcodeAndSource - the opcode of the type instruction to be visited. This opcode is either INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or INVOKEINTERFACE.
        owner - the internal name of the method's owner class (see Type.getInternalName()).
        name - the method's name.
        descriptor - the method's descriptor (see Type).
        isInterface - if the method's owner class is an interface.

      • visitInvokeDynamicInsn

        public void visitInvokeDynamicInsn​(java.lang.String name,
                                   java.lang.String descriptor,
                                   Handle bootstrapMethodHandle,
                                   java.lang.Object... bootstrapMethodArguments)
        Description copied from class: MethodVisitor
        Visits an invokedynamic instruction.
        Overrides:
        visitInvokeDynamicInsn in class MethodVisitor
        Parameters:
        name - the method's name.
        descriptor - the method's descriptor (see Type).
        bootstrapMethodHandle - the bootstrap method.
        bootstrapMethodArguments - the bootstrap method constant arguments. Each argument must be an Integer, Float, Long, Double, String, Type, Handle or ConstantDynamic value. This method is allowed to modify the content of the array so a caller should expect that this array may change.

      • visitJumpInsn

        public void visitJumpInsn​(int opcode,
                          Label label)
        Description copied from class: MethodVisitor
        Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction.
        Overrides:
        visitJumpInsn in class MethodVisitor
        Parameters:
        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.
        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.

      • visitLabel

        public void visitLabel​(Label label)
        Description copied from class: MethodVisitor
        Visits a label. A label designates the instruction that will be visited just after it.
        Overrides:
        visitLabel in class MethodVisitor
        Parameters:
        label - a Label object.

      • visitLdcInsn

        public void visitLdcInsn​(java.lang.Object value)
        Description copied from class: MethodVisitor
        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
 }
        Overrides:
        visitLdcInsn in class MethodVisitor
        Parameters:
        value - the constant to be loaded on the stack. This parameter must be a non null Integer, a Float, a Long, a Double, a String, a Type of OBJECT or ARRAY sort for .class constants, for classes whose version is 49, a Type of METHOD sort for MethodType, a Handle for MethodHandle constants, for classes whose version is 51 or a ConstantDynamic for a constant dynamic for classes whose version is 55.

      • visitIincInsn

        public void visitIincInsn​(int var,
                          int increment)
        Description copied from class: MethodVisitor
        Visits an IINC instruction.
        Overrides:
        visitIincInsn in class MethodVisitor
        Parameters:
        var - index of the local variable to be incremented.
        increment - amount to increment the local variable by.

      • visitTableSwitchInsn

        public void visitTableSwitchInsn​(int min,
                                 int max,
                                 Label dflt,
                                 Label... labels)
        Description copied from class: MethodVisitor
        Visits a TABLESWITCH instruction.
        Overrides:
        visitTableSwitchInsn in class MethodVisitor
        Parameters:
        min - the minimum key value.
        max - the maximum key value.
        dflt - beginning of the default handler block.
        labels - beginnings of the handler blocks. labels[i] is the beginning of the handler block for the min + i key.

      • visitLookupSwitchInsn

        public void visitLookupSwitchInsn​(Label dflt,
                                  int[] keys,
                                  Label[] labels)
        Description copied from class: MethodVisitor
        Visits a LOOKUPSWITCH instruction.
        Overrides:
        visitLookupSwitchInsn in class MethodVisitor
        Parameters:
        dflt - beginning of the default handler block.
        keys - the values of the keys.
        labels - beginnings of the handler blocks. labels[i] is the beginning of the handler block for the keys[i] key.

      • visitMultiANewArrayInsn

        public void visitMultiANewArrayInsn​(java.lang.String descriptor,
                                    int numDimensions)
        Description copied from class: MethodVisitor
        Visits a MULTIANEWARRAY instruction.
        Overrides:
        visitMultiANewArrayInsn in class MethodVisitor
        Parameters:
        descriptor - an array type descriptor (see Type).
        numDimensions - the number of dimensions of the array to allocate.

      • visitTryCatchBlock

        public void visitTryCatchBlock​(Label start,
                               Label end,
                               Label handler,
                               java.lang.String type)
        Description copied from class: MethodVisitor
        Visits a try catch block.
        Overrides:
        visitTryCatchBlock in class MethodVisitor
        Parameters:
        start - the beginning of the exception handler's scope (inclusive).
        end - the end of the exception handler's scope (exclusive).
        handler - the beginning of the exception handler's code.
        type - the internal name of the type of exceptions handled by the handler, or null to catch any exceptions (for "finally" blocks).

      • visitLocalVariable

        public void visitLocalVariable​(java.lang.String name,
                               java.lang.String descriptor,
                               java.lang.String signature,
                               Label start,
                               Label end,
                               int index)
        Description copied from class: MethodVisitor
        Visits a local variable declaration.
        Overrides:
        visitLocalVariable in class MethodVisitor
        Parameters:
        name - the name of a local variable.
        descriptor - the type descriptor of this local variable.
        signature - the type signature of this local variable. May be null if the local variable type does not use generic types.
        start - the first instruction corresponding to the scope of this local variable (inclusive).
        end - the last instruction corresponding to the scope of this local variable (exclusive).
        index - the local variable's index.

      • visitLocalVariableAnnotation

        public AnnotationVisitor visitLocalVariableAnnotation​(int typeRef,
                                                      TypePath typePath,
                                                      Label[] start,
                                                      Label[] end,
                                                      int[] index,
                                                      java.lang.String descriptor,
                                                      boolean visible)
        Description copied from class: MethodVisitor
        Visits an annotation on a local variable type.
        Overrides:
        visitLocalVariableAnnotation in class MethodVisitor
        Parameters:
        typeRef - a reference to the annotated type. The sort of this type reference must be TypeReference.LOCAL_VARIABLE or TypeReference.RESOURCE_VARIABLE. See TypeReference.
        typePath - the path to the annotated type argument, wildcard bound, array element type, or static inner type within 'typeRef'. May be null if the annotation targets 'typeRef' as a whole.
        start - the fist instructions corresponding to the continuous ranges that make the scope of this local variable (inclusive).
        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.
        index - the local variable's index in each range. This array must have the same size as the 'start' array.
        descriptor - the class descriptor of the annotation class.
        visible - true if the annotation is visible at runtime.
        Returns:
        a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

      • visitLineNumber

        public void visitLineNumber​(int line,
                            Label start)
        Description copied from class: MethodVisitor
        Visits a line number declaration.
        Overrides:
        visitLineNumber in class MethodVisitor
        Parameters:
        line - a line number. This number refers to the source file from which the class was compiled.
        start - the first instruction corresponding to this line number.

      • visitMaxs

        public void visitMaxs​(int maxStack,
                      int maxLocals)
        Description copied from class: MethodVisitor
        Visits the maximum stack size and the maximum number of local variables of the method.
        Overrides:
        visitMaxs in class MethodVisitor
        Parameters:
        maxStack - maximum stack size of the method.
        maxLocals - maximum number of local variables for the method.

      • visitEnd

        public void visitEnd()
        Description copied from class: MethodVisitor
        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.
        Overrides:
        visitEnd in class MethodVisitor

      • checkVisitCodeCalled

        private void checkVisitCodeCalled()
        Checks that the visitCode() method has been called.

      • checkVisitMaxsNotCalled

        private void checkVisitMaxsNotCalled()
        Checks that the visitMaxs(int, int) method has not been called.

      • checkVisitEndNotCalled

        private void checkVisitEndNotCalled()
        Checks that the visitEnd() method has not been called.

      • checkFrameValue

        private void checkFrameValue​(java.lang.Object value)
        Checks a stack frame value.
        Parameters:
        value - the value to be checked.

      • checkOpcodeMethod

        private static void checkOpcodeMethod​(int opcode,
                                      CheckMethodAdapter.Method method)
        Checks that the method to visit the given opcode is equal to the given method.
        Parameters:
        opcode - the opcode to be checked.
        method - the expected visit method.

      • checkSignedByte

        private static void checkSignedByte​(int value,
                                    java.lang.String message)
        Checks that the given value is a signed byte.
        Parameters:
        value - the value to be checked.
        message - the message to use in case of error.

      • checkSignedShort

        private static void checkSignedShort​(int value,
                                     java.lang.String message)
        Checks that the given value is a signed short.
        Parameters:
        value - the value to be checked.
        message - the message to use in case of error.

      • checkUnsignedShort

        private static void checkUnsignedShort​(int value,
                                       java.lang.String message)
        Checks that the given value is an unsigned short.
        Parameters:
        value - the value to be checked.
        message - the message to use in case of error.

      • checkConstant

        static void checkConstant​(java.lang.Object value)
        Checks that the given value is an Integer, Float, Long, Double or String value.
        Parameters:
        value - the value to be checked.

      • checkLdcConstant

        private void checkLdcConstant​(java.lang.Object value)
        Checks that the given value is a valid operand for the LDC instruction.
        Parameters:
        value - the value to be checked.

      • checkUnqualifiedName

        static void checkUnqualifiedName​(int version,
                                 java.lang.String name,
                                 java.lang.String message)
        Checks that the given string is a valid unqualified name.
        Parameters:
        version - the class version.
        name - the string to be checked.
        message - the message to use in case of error.

      • checkIdentifier

        static void checkIdentifier​(int version,
                            java.lang.String name,
                            int startPos,
                            int endPos,
                            java.lang.String message)
        Checks that the given substring is a valid Java identifier.
        Parameters:
        version - the class version.
        name - the string to be checked.
        startPos - the index of the first character of the identifier (inclusive).
        endPos - the index of the last character of the identifier (exclusive). -1 is equivalent to name.length() if name is not null.
        message - the message to use in case of error.

      • checkMethodIdentifier

        static void checkMethodIdentifier​(int version,
                                  java.lang.String name,
                                  java.lang.String message)
        Checks that the given string is a valid Java identifier.
        Parameters:
        version - the class version.
        name - the string to be checked.
        message - the message to use in case of error.

      • checkInternalName

        static void checkInternalName​(int version,
                              java.lang.String name,
                              java.lang.String message)
        Checks that the given string is a valid internal class name or array type descriptor.
        Parameters:
        version - the class version.
        name - the string to be checked.
        message - the message to use in case of error.

      • checkInternalClassName

        private static void checkInternalClassName​(int version,
                                           java.lang.String name,
                                           java.lang.String message)
        Checks that the given string is a valid internal class name.
        Parameters:
        version - the class version.
        name - the string to be checked.
        message - the message to use in case of error.

      • checkDescriptor

        static void checkDescriptor​(int version,
                            java.lang.String descriptor,
                            boolean canBeVoid)
        Checks that the given string is a valid type descriptor.
        Parameters:
        version - the class version.
        descriptor - the string to be checked.
        canBeVoid - true if V can be considered valid.

      • checkDescriptor

        private static int checkDescriptor​(int version,
                                   java.lang.String descriptor,
                                   int startPos,
                                   boolean canBeVoid)
        Checks that a the given substring is a valid type descriptor.
        Parameters:
        version - the class version.
        descriptor - the string to be checked.
        startPos - the index of the first character of the type descriptor (inclusive).
        canBeVoid - whether V can be considered valid.
        Returns:
        the index of the last character of the type descriptor, plus one.

      • checkMethodDescriptor

        static void checkMethodDescriptor​(int version,
                                  java.lang.String descriptor)
        Checks that the given string is a valid method descriptor.
        Parameters:
        version - the class version.
        descriptor - the string to be checked.

      • checkLabel

        private void checkLabel​(Label label,
                        boolean checkVisited,
                        java.lang.String message)
        Checks that the given label is not null. This method can also check that the label has been visited.
        Parameters:
        label - the label to be checked.
        checkVisited - whether to check that the label has been visited.
        message - the message to use in case of error.