程序包 cn.taketoday.bytecode

类 MethodWriter

java.lang.Object
cn.taketoday.bytecode.MethodVisitor
cn.taketoday.bytecode.MethodWriter
final class MethodWriter extends MethodVisitor
A MethodVisitor that generates a corresponding 'method_info' structure, as defined in the Java Virtual Machine Specification (JVMS).
作者:
Eric Bruneton, Eugene Kuleshov
另请参阅:

  • 字段详细资料

    • COMPUTE_NOTHING

      static final int COMPUTE_NOTHING
      Indicates that nothing must be computed.
      另请参阅:

    • COMPUTE_MAX_STACK_AND_LOCAL

      static final int COMPUTE_MAX_STACK_AND_LOCAL
      Indicates that the maximum stack size and the maximum number of local variables must be computed, from scratch.
      另请参阅:

    • COMPUTE_MAX_STACK_AND_LOCAL_FROM_FRAMES

      static final int COMPUTE_MAX_STACK_AND_LOCAL_FROM_FRAMES
      Indicates that the maximum stack size and the maximum number of local variables must be computed, from the existing stack map frames. This can be done more efficiently than with the control flow graph algorithm used for COMPUTE_MAX_STACK_AND_LOCAL, by using a linear scan of the bytecode instructions.
      另请参阅:

    • COMPUTE_INSERTED_FRAMES

      static final int COMPUTE_INSERTED_FRAMES
      Indicates that the stack map frames of type F_INSERT must be computed. The other frames are not computed. They should all be of type F_NEW and should be sufficient to compute the content of the F_INSERT frames, together with the bytecode instructions between a F_NEW and a F_INSERT frame - and without any knowledge of the type hierarchy (by definition of F_INSERT).
      另请参阅:

    • COMPUTE_ALL_FRAMES

      static final int COMPUTE_ALL_FRAMES
      Indicates that all the stack map frames must be computed. In this case the maximum stack size and the maximum number of local variables is also computed.
      另请参阅:

    • NA

      private static final int NA
      Indicates that STACK_SIZE_DELTA is not applicable (not constant or never used).
      另请参阅:

    • STACK_SIZE_DELTA

      private static final int[] STACK_SIZE_DELTA
      The stack size variation corresponding to each JVM opcode. The stack size variation for opcode 'o' is given by the array element at index 'o'.
      另请参阅:

    • symbolTable

      private final SymbolTable symbolTable
      Where the constants used in this MethodWriter must be stored.

    • accessFlags

      private final int accessFlags
      The access_flags field of the method_info JVMS structure. This field can contain ASM specific access flags, such as Opcodes.ACC_DEPRECATED, which are removed when generating the ClassFile structure.

    • nameIndex

      private final int nameIndex
      The name_index field of the method_info JVMS structure.

    • name

      private final String name
      The name of this method.

    • descriptorIndex

      private final int descriptorIndex
      The descriptor_index field of the method_info JVMS structure.

    • descriptor

      private final String descriptor
      The descriptor of this method.

    • maxStack

      private int maxStack
      The max_stack field of the Code attribute.

    • maxLocals

      private int maxLocals
      The max_locals field of the Code attribute.

    • code

      private final ByteVector code
      The 'code' field of the Code attribute.

    • firstHandler

      private Handler firstHandler
      The first element in the exception handler list (used to generate the exception_table of the Code attribute). The next ones can be accessed with the Handler.nextHandler field. May be null.

    • lastHandler

      private Handler lastHandler
      The last element in the exception handler list (used to generate the exception_table of the Code attribute). The next ones can be accessed with the Handler.nextHandler field. May be null.

    • lineNumberTableLength

      private int lineNumberTableLength
      The line_number_table_length field of the LineNumberTable code attribute.

    • lineNumberTable

      private ByteVector lineNumberTable
      The line_number_table array of the LineNumberTable code attribute, or null.

    • localVariableTableLength

      private int localVariableTableLength
      The local_variable_table_length field of the LocalVariableTable code attribute.

    • localVariableTable

      private ByteVector localVariableTable
      The local_variable_table array of the LocalVariableTable code attribute, or null.

    • localVariableTypeTableLength

      private int localVariableTypeTableLength
      The local_variable_type_table_length field of the LocalVariableTypeTable code attribute.

    • localVariableTypeTable

      private ByteVector localVariableTypeTable
      The local_variable_type_table array of the LocalVariableTypeTable code attribute, or null.

    • stackMapTableNumberOfEntries

      private int stackMapTableNumberOfEntries
      The number_of_entries field of the StackMapTable code attribute.

    • stackMapTableEntries

      private ByteVector stackMapTableEntries
      The 'entries' array of the StackMapTable code attribute.

    • lastCodeRuntimeVisibleTypeAnnotation

      private AnnotationWriter lastCodeRuntimeVisibleTypeAnnotation
      The last runtime visible type annotation of the Code attribute. The previous ones can be accessed with the AnnotationWriter.previousAnnotation field. May be null.

    • lastCodeRuntimeInvisibleTypeAnnotation

      private AnnotationWriter lastCodeRuntimeInvisibleTypeAnnotation
      The last runtime invisible type annotation of the Code attribute. The previous ones can be accessed with the AnnotationWriter.previousAnnotation field. May be null.

    • firstCodeAttribute

      private Attribute firstCodeAttribute
      The first non standard attribute of the Code attribute. The next ones can be accessed with the Attribute.nextAttribute field. May be null.

      WARNING: this list stores the attributes in the reverse order of their visit. firstAttribute is actually the last attribute visited in visitAttribute(cn.taketoday.bytecode.Attribute). The putMethodInfo(cn.taketoday.bytecode.ByteVector) method writes the attributes in the order defined by this list, i.e. in the reverse order specified by the user.

    • numberOfExceptions

      private final int numberOfExceptions
      The number_of_exceptions field of the Exceptions attribute.

    • exceptionIndexTable

      private final int[] exceptionIndexTable
      The exception_index_table array of the Exceptions attribute, or null.

    • signatureIndex

      private final int signatureIndex
      The signature_index field of the Signature attribute.

    • lastRuntimeVisibleAnnotation

      private AnnotationWriter lastRuntimeVisibleAnnotation
      The last runtime visible annotation of this method. The previous ones can be accessed with the AnnotationWriter.previousAnnotation field. May be null.

    • lastRuntimeInvisibleAnnotation

      private AnnotationWriter lastRuntimeInvisibleAnnotation
      The last runtime invisible annotation of this method. The previous ones can be accessed with the AnnotationWriter.previousAnnotation field. May be null.

    • visibleAnnotableParameterCount

      private int visibleAnnotableParameterCount
      The number of method parameters that can have runtime visible annotations, or 0.

    • lastRuntimeVisibleParameterAnnotations

      private AnnotationWriter[] lastRuntimeVisibleParameterAnnotations
      The runtime visible parameter annotations of this method. Each array element contains the last annotation of a parameter (which can be null - the previous ones can be accessed with the AnnotationWriter.previousAnnotation field). May be null.

    • invisibleAnnotableParameterCount

      private int invisibleAnnotableParameterCount
      The number of method parameters that can have runtime visible annotations, or 0.

    • lastRuntimeInvisibleParameterAnnotations

      private AnnotationWriter[] lastRuntimeInvisibleParameterAnnotations
      The runtime invisible parameter annotations of this method. Each array element contains the last annotation of a parameter (which can be null - the previous ones can be accessed with the AnnotationWriter.previousAnnotation field). May be null.

    • lastRuntimeVisibleTypeAnnotation

      private AnnotationWriter lastRuntimeVisibleTypeAnnotation
      The last runtime visible type annotation of this method. The previous ones can be accessed with the AnnotationWriter.previousAnnotation field. May be null.

    • lastRuntimeInvisibleTypeAnnotation

      private AnnotationWriter lastRuntimeInvisibleTypeAnnotation
      The last runtime invisible type annotation of this method. The previous ones can be accessed with the AnnotationWriter.previousAnnotation field. May be null.

    • defaultValue

      private ByteVector defaultValue
      The default_value field of the AnnotationDefault attribute, or null.

    • parametersCount

      private int parametersCount
      The parameters_count field of the MethodParameters attribute.

    • parameters

      private ByteVector parameters
      The 'parameters' array of the MethodParameters attribute, or null.

    • firstAttribute

      private Attribute firstAttribute
      The first non standard attribute of this method. The next ones can be accessed with the Attribute.nextAttribute field. May be null.

      WARNING: this list stores the attributes in the reverse order of their visit. firstAttribute is actually the last attribute visited in visitAttribute(cn.taketoday.bytecode.Attribute). The putMethodInfo(cn.taketoday.bytecode.ByteVector) method writes the attributes in the order defined by this list, i.e. in the reverse order specified by the user.

    • compute

      private final int compute
      Indicates what must be computed. Must be one of COMPUTE_ALL_FRAMES, COMPUTE_INSERTED_FRAMES, COMPUTE_MAX_STACK_AND_LOCAL_FROM_FRAMES, COMPUTE_MAX_STACK_AND_LOCAL or COMPUTE_NOTHING.

    • firstBasicBlock

      private Label firstBasicBlock
      The first basic block of the method. The next ones (in bytecode offset order) can be accessed with the Label.nextBasicBlock field.

    • lastBasicBlock

      private Label lastBasicBlock
      The last basic block of the method (in bytecode offset order). This field is updated each time a basic block is encountered, and is used to append it at the end of the basic block list.

    • currentBasicBlock

      private Label currentBasicBlock
      The current basic block, i.e. the basic block of the last visited instruction. When compute is equal to COMPUTE_MAX_STACK_AND_LOCAL or COMPUTE_ALL_FRAMES, this field is null for unreachable code. When compute is equal to COMPUTE_MAX_STACK_AND_LOCAL_FROM_FRAMES or COMPUTE_INSERTED_FRAMES, this field stays unchanged throughout the whole method (i.e. the whole code is seen as a single basic block; indeed, the existing frames are sufficient by hypothesis to compute any intermediate frame - and the maximum stack size as well - without using any control flow graph).

    • relativeStackSize

      private int relativeStackSize
      The relative stack size after the last visited instruction. This size is relative to the beginning of currentBasicBlock, i.e. the true stack size after the last visited instruction is equal to the Label.inputStackSize of the current basic block plus relativeStackSize. When compute is equal to COMPUTE_MAX_STACK_AND_LOCAL_FROM_FRAMES, currentBasicBlock is always the start of the method, so this relative size is also equal to the absolute stack size after the last visited instruction.

    • maxRelativeStackSize

      private int maxRelativeStackSize
      The maximum relative stack size after the last visited instruction. This size is relative to the beginning of currentBasicBlock, i.e. the true maximum stack size after the last visited instruction is equal to the Label.inputStackSize of the current basic block plus maxRelativeStackSize.When compute is equal to COMPUTE_MAX_STACK_AND_LOCAL_FROM_FRAMES, currentBasicBlock is always the start of the method, so this relative size is also equal to the absolute maximum stack size after the last visited instruction.

    • currentLocals

      private int currentLocals
      The number of local variables in the last visited stack map frame.

    • previousFrameOffset

      private int previousFrameOffset
      The bytecode offset of the last frame that was written in stackMapTableEntries.

    • previousFrame

      private int[] previousFrame
      The last frame that was written in stackMapTableEntries. This field has the same format as currentFrame.

    • currentFrame

      private int[] currentFrame
      The current stack map frame. The first element contains the bytecode offset of the instruction to which the frame corresponds, the second element is the number of locals and the third one is the number of stack elements. The local variables start at index 3 and are followed by the operand stack elements. In summary frame[0] = offset, frame[1] = numLocal, frame[2] = numStack. Local variables and operand stack entries contain abstract types, as defined in Frame, but restricted to Frame.CONSTANT_KIND, Frame.REFERENCE_KIND or Frame.UNINITIALIZED_KIND abstract types. Long and double types use only one array entry.

    • hasSubroutines

      private boolean hasSubroutines
      Whether this method contains subroutines.

    • hasAsmInstructions

      private boolean hasAsmInstructions
      Whether the bytecode of this method contains ASM specific instructions.

    • lastBytecodeOffset

      private int lastBytecodeOffset
      The start offset of the last visited instruction. Used to set the offset field of type annotations of type 'offset_target' (see JVMS 4.7.20.1).

    • sourceOffset

      private int sourceOffset
      The offset in bytes in SymbolTable.getSource() from which the method_info for this method (excluding its first 6 bytes) must be copied, or 0.

    • sourceLength

      private int sourceLength
      The length in bytes in SymbolTable.getSource() which must be copied to get the method_info for this method (excluding its first 6 bytes for access_flags, name_index and descriptor_index).

  • 构造器详细资料

    • MethodWriter

      MethodWriter(SymbolTable symbolTable, int access, String name, String descriptor, String signature, String[] exceptions, int compute)
      Constructs a new MethodWriter.
      参数:
      symbolTable - where the constants used in this AnnotationWriter must be stored.
      access - the method's access flags (see Opcodes).
      name - the method's name.
      descriptor - the method's descriptor (see Type).
      signature - the method's signature. May be null.
      exceptions - the internal names of the method's exceptions. May be null.
      compute - indicates what must be computed (see #compute).

  • 方法详细资料

    • hasFrames

      boolean hasFrames()

    • hasAsmInstructions

      boolean hasAsmInstructions()

    • visitParameter

      public void visitParameter(String name, int access)
      从类复制的说明: MethodVisitor
      Visits a parameter of this method.
      覆盖:
      visitParameter 在类中 MethodVisitor
      参数:
      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).

    • visitAnnotationDefault

      public AnnotationVisitor visitAnnotationDefault()
      从类复制的说明: MethodVisitor
      Visits the default value of this annotation interface method.
      覆盖:
      visitAnnotationDefault 在类中 MethodVisitor
      返回:
      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.

    • visitAnnotation

      public AnnotationVisitor visitAnnotation(String descriptor, boolean visible)
      从类复制的说明: MethodVisitor
      Visits an annotation of this method.
      覆盖:
      visitAnnotation 在类中 MethodVisitor
      参数:
      descriptor - the class descriptor of the annotation class.
      visible - true if the annotation is visible at runtime.
      返回:
      a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

    • visitTypeAnnotation

      public AnnotationVisitor visitTypeAnnotation(int typeRef, TypePath typePath, String descriptor, boolean visible)
      从类复制的说明: MethodVisitor
      Visits an annotation on a type in the method signature.
      覆盖:
      visitTypeAnnotation 在类中 MethodVisitor
      参数:
      typeRef - a reference to the annotated type. The sort of this type reference must be TypeReference.METHOD_TYPE_PARAMETER, TypeReference.METHOD_TYPE_PARAMETER_BOUND, TypeReference.METHOD_RETURN, TypeReference.METHOD_RECEIVER, TypeReference.METHOD_FORMAL_PARAMETER or TypeReference.THROWS. 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.
      descriptor - the class descriptor of the annotation class.
      visible - true if the annotation is visible at runtime.
      返回:
      a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

    • visitAnnotableParameterCount

      public void visitAnnotableParameterCount(int parameterCount, boolean visible)
      从类复制的说明: 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.
      覆盖:
      visitAnnotableParameterCount 在类中 MethodVisitor
      参数:
      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, String annotationDescriptor, boolean visible)
      从类复制的说明: MethodVisitor
      Visits an annotation of a parameter this method.
      覆盖:
      visitParameterAnnotation 在类中 MethodVisitor
      参数:
      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).
      annotationDescriptor - the class descriptor of the annotation class.
      visible - true if the annotation is visible at runtime.
      返回:
      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)
      从类复制的说明: MethodVisitor
      Visits a non standard attribute of this method.
      覆盖:
      visitAttribute 在类中 MethodVisitor
      参数:
      attribute - an attribute.

    • visitCode

      public void visitCode()
      从类复制的说明: MethodVisitor
      Starts the visit of the method's code, if any (i.e. non abstract method).
      覆盖:
      visitCode 在类中 MethodVisitor

    • visitFrame

      public void visitFrame(int type, int numLocal, Object[] local, int numStack, Object[] stack)
      从类复制的说明: 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).
      覆盖:
      visitFrame 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a zero operand instruction.
      覆盖:
      visitInsn 在类中 MethodVisitor
      参数:
      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.

    • visitIntInsn

      public void visitIntInsn(int opcode, int operand)
      从类复制的说明: MethodVisitor
      Visits an instruction with a single int operand.
      覆盖:
      visitIntInsn 在类中 MethodVisitor
      参数:
      opcode - the opcode of the instruction to be visited. This opcode is either BIPUSH, SIPUSH or NEWARRAY.
      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 Opcodes.T_BOOLEAN, Opcodes.T_CHAR, Opcodes.T_FLOAT, Opcodes.T_DOUBLE, Opcodes.T_BYTE, Opcodes.T_SHORT, Opcodes.T_INT or Opcodes.T_LONG.

    • visitVarInsn

      public void visitVarInsn(int opcode, int var)
      从类复制的说明: MethodVisitor
      Visits a local variable instruction. A local variable instruction is an instruction that loads or stores the value of a local variable.
      覆盖:
      visitVarInsn 在类中 MethodVisitor
      参数:
      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, String type)
      从类复制的说明: MethodVisitor
      Visits a type instruction. A type instruction is an instruction that takes the internal name of a class as parameter.
      覆盖:
      visitTypeInsn 在类中 MethodVisitor
      参数:
      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, String owner, String name, String descriptor)
      从类复制的说明: MethodVisitor
      Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object.
      覆盖:
      visitFieldInsn 在类中 MethodVisitor
      参数:
      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 opcode, String owner, String name, String descriptor, boolean isInterface)
      从类复制的说明: MethodVisitor
      Visits a method instruction. A method instruction is an instruction that invokes a method.
      覆盖:
      visitMethodInsn 在类中 MethodVisitor
      参数:
      opcode - 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(String name, String descriptor, Handle bootstrapMethodHandle, Object... bootstrapMethodArguments)
      从类复制的说明: MethodVisitor
      Visits an invokedynamic instruction.
      覆盖:
      visitInvokeDynamicInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction.
      覆盖:
      visitJumpInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a label. A label designates the instruction that will be visited just after it.
      覆盖:
      visitLabel 在类中 MethodVisitor
      参数:
      label - a Label object.

    • visitLdcInsn

      public void visitLdcInsn(Object value)
      从类复制的说明: 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
 }
      覆盖:
      visitLdcInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits an IINC instruction.
      覆盖:
      visitIincInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a TABLESWITCH instruction.
      覆盖:
      visitTableSwitchInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a LOOKUPSWITCH instruction.
      覆盖:
      visitLookupSwitchInsn 在类中 MethodVisitor
      参数:
      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.

    • visitSwitchInsn

      private void visitSwitchInsn(Label dflt, Label[] labels)

    • visitMultiANewArrayInsn

      public void visitMultiANewArrayInsn(String descriptor, int numDimensions)
      从类复制的说明: MethodVisitor
      Visits a MULTIANEWARRAY instruction.
      覆盖:
      visitMultiANewArrayInsn 在类中 MethodVisitor
      参数:
      descriptor - an array type descriptor (see Type).
      numDimensions - the number of dimensions of the array to allocate.

    • visitInsnAnnotation

      public AnnotationVisitor visitInsnAnnotation(int typeRef, TypePath typePath, String descriptor, boolean visible)
      从类复制的说明: MethodVisitor
      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.
      覆盖:
      visitInsnAnnotation 在类中 MethodVisitor
      参数:
      typeRef - a reference to the annotated type. The sort of this type reference must be TypeReference.INSTANCEOF, TypeReference.NEW, TypeReference.CONSTRUCTOR_REFERENCE, TypeReference.METHOD_REFERENCE, TypeReference.CAST, TypeReference.CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT, TypeReference.METHOD_INVOCATION_TYPE_ARGUMENT, TypeReference.CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT, or TypeReference.METHOD_REFERENCE_TYPE_ARGUMENT. 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.
      descriptor - the class descriptor of the annotation class.
      visible - true if the annotation is visible at runtime.
      返回:
      a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

    • visitTryCatchBlock

      public void visitTryCatchBlock(Label start, Label end, Label handler, String type)
      从类复制的说明: MethodVisitor
      Visits a try catch block.
      覆盖:
      visitTryCatchBlock 在类中 MethodVisitor
      参数:
      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).

    • visitTryCatchAnnotation

      public AnnotationVisitor visitTryCatchAnnotation(int typeRef, TypePath typePath, String descriptor, boolean visible)
      从类复制的说明: MethodVisitor
      Visits an annotation on an exception handler type. This method must be called after the MethodVisitor.visitTryCatchBlock(cn.taketoday.bytecode.Label, cn.taketoday.bytecode.Label, cn.taketoday.bytecode.Label, java.lang.String) for the annotated exception handler. It can be called several times for the same exception handler.
      覆盖:
      visitTryCatchAnnotation 在类中 MethodVisitor
      参数:
      typeRef - a reference to the annotated type. The sort of this type reference must be TypeReference.EXCEPTION_PARAMETER. 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.
      descriptor - the class descriptor of the annotation class.
      visible - true if the annotation is visible at runtime.
      返回:
      a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

    • visitLocalVariable

      public void visitLocalVariable(String name, String descriptor, String signature, Label start, Label end, int index)
      从类复制的说明: MethodVisitor
      Visits a local variable declaration.
      覆盖:
      visitLocalVariable 在类中 MethodVisitor
      参数:
      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, String descriptor, boolean visible)
      从类复制的说明: MethodVisitor
      Visits an annotation on a local variable type.
      覆盖:
      visitLocalVariableAnnotation 在类中 MethodVisitor
      参数:
      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.
      返回:
      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)
      从类复制的说明: MethodVisitor
      Visits a line number declaration.
      覆盖:
      visitLineNumber 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits the maximum stack size and the maximum number of local variables of the method.
      覆盖:
      visitMaxs 在类中 MethodVisitor
      参数:
      maxStack - maximum stack size of the method.
      maxLocals - maximum number of local variables for the method.

    • computeAllFrames

      private void computeAllFrames()
      Computes all the stack map frames of the method, from scratch.

    • computeMaxStackAndLocal

      private void computeMaxStackAndLocal()
      Computes the maximum stack size of the method.

    • visitEnd

      public void visitEnd()
      从类复制的说明: 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.
      覆盖:
      visitEnd 在类中 MethodVisitor

    • addSuccessorToCurrentBasicBlock

      private void addSuccessorToCurrentBasicBlock(int info, Label successor)
      Adds a successor to currentBasicBlock in the control flow graph.
      参数:
      info - information about the control flow edge to be added.
      successor - the successor block to be added to the current basic block.

    • endCurrentBasicBlockWithNoSuccessor

      private void endCurrentBasicBlockWithNoSuccessor()
      Ends the current basic block. This method must be used in the case where the current basic block does not have any successor.

      WARNING: this method must be called after the currently visited instruction has been put in code (if frames are computed, this method inserts a new Label to start a new basic block after the current instruction).

    • visitFrameStart

      int visitFrameStart(int offset, int numLocal, int numStack)
      Starts the visit of a new stack map frame, stored in currentFrame.
      参数:
      offset - the bytecode offset of the instruction to which the frame corresponds.
      numLocal - the number of local variables in the frame.
      numStack - the number of stack elements in the frame.
      返回:
      the index of the next element to be written in this frame.

    • visitAbstractType

      void visitAbstractType(int frameIndex, int abstractType)
      Sets an abstract type in currentFrame.
      参数:
      frameIndex - the index of the element to be set in currentFrame.
      abstractType - an abstract type.

    • visitFrameEnd

      void visitFrameEnd()
      Ends the visit of currentFrame by writing it in the StackMapTable entries and by updating the StackMapTable number_of_entries (except if the current frame is the first one, which is implicit in StackMapTable). Then resets currentFrame to null.

    • putFrame

      private void putFrame()
      Compresses and writes currentFrame in a new StackMapTable entry.

    • putAbstractTypes

      private void putAbstractTypes(int start, int end)
      Puts some abstract types of currentFrame in stackMapTableEntries , using the JVMS verification_type_info format used in StackMapTable attributes.
      参数:
      start - index of the first type in currentFrame to write.
      end - index of last type in currentFrame to write (exclusive).

    • putFrameType

      private void putFrameType(Object type)
      Puts the given public API frame element type in stackMapTableEntries , using the JVMS verification_type_info format used in StackMapTable attributes.
      参数:
      type - a frame element type described using the same format as in MethodVisitor.visitFrame(int, int, java.lang.Object[], int, java.lang.Object[]), i.e. either Opcodes.TOP, Opcodes.INTEGER, Opcodes.FLOAT, Opcodes.LONG, Opcodes.DOUBLE, Opcodes.NULL, or Opcodes.UNINITIALIZED_THIS, or the internal name of a class, or a Label designating a NEW instruction (for uninitialized types).

    • canCopyMethodAttributes

      boolean canCopyMethodAttributes(ClassReader source, boolean hasSyntheticAttribute, boolean hasDeprecatedAttribute, int descriptorIndex, int signatureIndex, int exceptionsOffset)
      Returns whether the attributes of this method can be copied from the attributes of the given method (assuming there is no method visitor between the given ClassReader and this MethodWriter). This method should only be called just after this MethodWriter has been created, and before any content is visited. It returns true if the attributes corresponding to the constructor arguments (at most a Signature, an Exception, a Deprecated and a Synthetic attribute) are the same as the corresponding attributes in the given method.
      参数:
      source - the source ClassReader from which the attributes of this method might be copied.
      hasSyntheticAttribute - whether the method_info JVMS structure from which the attributes of this method might be copied contains a Synthetic attribute.
      hasDeprecatedAttribute - whether the method_info JVMS structure from which the attributes of this method might be copied contains a Deprecated attribute.
      descriptorIndex - the descriptor_index field of the method_info JVMS structure from which the attributes of this method might be copied.
      signatureIndex - the constant pool index contained in the Signature attribute of the method_info JVMS structure from which the attributes of this method might be copied, or 0.
      exceptionsOffset - the offset in 'source.b' of the Exceptions attribute of the method_info JVMS structure from which the attributes of this method might be copied, or 0.
      返回:
      whether the attributes of this method can be copied from the attributes of the method_info JVMS structure in 'source.b', between 'methodInfoOffset' and 'methodInfoOffset' + 'methodInfoLength'.

    • setMethodAttributesSource

      void setMethodAttributesSource(int methodInfoOffset, int methodInfoLength)
      Sets the source from which the attributes of this method will be copied.
      参数:
      methodInfoOffset - the offset in 'symbolTable.getSource()' of the method_info JVMS structure from which the attributes of this method will be copied.
      methodInfoLength - the length in 'symbolTable.getSource()' of the method_info JVMS structure from which the attributes of this method will be copied.

    • computeMethodInfoSize

      int computeMethodInfoSize()
      Returns the size of the method_info JVMS structure generated by this MethodWriter. Also add the names of the attributes of this method in the constant pool.
      返回:
      the size in bytes of the method_info JVMS structure.

    • putMethodInfo

      void putMethodInfo(ByteVector output)
      Puts the content of the method_info JVMS structure generated by this MethodWriter into the given ByteVector.
      参数:
      output - where the method_info structure must be put.

    • collectAttributePrototypes

      final void collectAttributePrototypes(Attribute.Set attributePrototypes)
      Collects the attributes of this method into the given set of attribute prototypes.
      参数:
      attributePrototypes - a set of attribute prototypes.