MethodWriter

java.lang.Object
- com.alibaba.fastjson2.internal.asm.MethodWriter

public final class MethodWriter
extends java.lang.Object

Field Summary

Fields
Modifier and Type	Field and Description
`private int`	`accessFlags`
`private ByteVector`	`code` The 'code' field of the Code attribute.
`private Label`	`currentBasicBlock`
`private int[]`	`currentFrame`
`private java.lang.String`	`descriptor` The descriptor of this method.
`private int`	`descriptorIndex` The descriptor_index field of the method_info JVMS structure.
`private Label`	`firstBasicBlock` The first basic block of the method.
`(package private) boolean`	`hasAsmInstructions`
`private Label`	`lastBasicBlock` The last basic block of the method (in bytecode offset order).
`private int`	`lastBytecodeOffset` The start offset of the last visited instruction.
`private int`	`maxLocals` The max_locals field of the Code attribute.
`private int`	`maxStack` The max_stack field of the Code attribute.
`(package private) MethodWriter`	`mv`
`private java.lang.String`	`name` The name of this method.
`private int`	`nameIndex` The name_index field of the method_info JVMS structure.
`private int[]`	`previousFrame` The last frame that was written in `stackMapTableEntries`.
`private ByteVector`	`stackMapTableEntries` The 'entries' array of the StackMapTable code attribute.
`(package private) int`	`stackMapTableNumberOfEntries` The number_of_entries field of the StackMapTable code attribute.
`private SymbolTable`	`symbolTable` Where the constants used in this MethodWriter must be stored.

Constructor Summary

Constructors
Constructor and Description
`MethodWriter(SymbolTable symbolTable, int access, java.lang.String name, java.lang.String descriptor, int codeInitCapacity)` Constructs a new `MethodWriter`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`aaload()`
`void`	`aastore()`
`void`	`aconst_null()`
`private void`	`addSuccessorToCurrentBasicBlock(Label successor)` Adds a successor to `currentBasicBlock` in the control flow graph.
`void`	`aload(int var)`
`void`	`anewArray(java.lang.String type)`
`void`	`areturn()`
`void`	`arraylength()`
`void`	`astore(int var)`
`void`	`bastore()`
`void`	`bipush(int operand)`
`void`	`castore()`
`void`	`checkcast(java.lang.String type)`
`void`	`cmpWithZero(java.lang.Class<?> fieldClass)`
`(package private) int`	`computeMethodInfoSize()` Returns the size of the method_info JVMS structure generated by this MethodWriter.
`void`	`dstore(int var)`
`void`	`dup()`
`void`	`dup(java.lang.Class<?> fieldClass)`
`void`	`dup2()`
`private void`	`endCurrentBasicBlockWithNoSuccessor()` Ends the current basic block.
`void`	`fstore(int var)`
`void`	`getfield(java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`void`	`getstatic(java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`void`	`goto_(Label label)`
`void`	`i2d()`
`void`	`i2f()`
`void`	`i2l()`
`void`	`iadd()`
`void`	`iconst_0()`
`void`	`iconst_1()`
`void`	`iconst_2()`
`void`	`iconst_3()`
`void`	`iconst_4()`
`void`	`iconst_5()`
`void`	`iconst_m1()`
`void`	`iconst_n(int n)`
`void`	`if_acmpeq(Label label)`
`void`	`if_acmpne(Label label)`
`void`	`if_icmpeq(Label label)`
`void`	`if_icmpge(Label label)`
`void`	`if_icmple(Label label)`
`void`	`if_icmpne(Label label)`
`void`	`ifeq(Label label)`
`void`	`ifge(Label label)`
`void`	`ifne(Label label)`
`void`	`ifnonnull(Label label)`
`void`	`ifnull(Label label)`
`void`	`iload(int var)`
`void`	`imul()`
`void`	`ineg()`
`void`	`instanceOf(java.lang.String type)`
`void`	`invokeinterface(java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`void`	`invokespecial(java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`void`	`invokestatic(java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`void`	`invokestatic(java.lang.String owner, java.lang.String name, java.lang.String descriptor, boolean isInterface)`
`void`	`invokevirtual(java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`void`	`ireturn()`
`void`	`istore(int var)`
`void`	`isub()`
`void`	`ixor()`
`void`	`l2i()`
`void`	`land()`
`void`	`lcmp()`
`void`	`lconst_0()`
`void`	`lload(int var)`
`void`	`loadLocal(java.lang.Class<?> cls, int var)`
`void`	`lor()`
`void`	`lstore(int var)`
`void`	`lushr()`
`void`	`lxor()`
`void`	`new_(java.lang.String type)`
`void`	`pop()`
`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.
`void`	`putfield(java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`private void`	`putFrame()` Compresses and writes `currentFrame` in a new StackMapTable entry.
`(package private) void`	`putMethodInfo(ByteVector output)` Puts the content of the method_info JVMS structure generated by this MethodWriter into the given ByteVector.
`void`	`return_()`
`void`	`sipush(int operand)`
`void`	`storeLocal(java.lang.Class<?> cls, int var)`
`void`	`swap()`
`(package private) void`	`visitAbstractType(int frameIndex, int abstractType)` Sets an abstract type in `currentFrame`.
`private void`	`visitFieldInsn(int opcode, java.lang.String owner, java.lang.String name, java.lang.String descriptor)`
`(package private) 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).
`(package private) int`	`visitFrameStart(int offset, int numLocal, int numStack)` Starts the visit of a new stack map frame, stored in `currentFrame`.
`void`	`visitIincInsn(int var, int increment)`
`private void`	`visitInsn(int opcode)`
`private void`	`visitIntInsn(int opcode, int operand)`
`private void`	`visitJumpInsn(int opcode, Label label)`
`void`	`visitLabel(Label label)`
`void`	`visitLdcInsn(java.lang.Class value)`
`void`	`visitLdcInsn(int value)`
`void`	`visitLdcInsn(long value)`
`void`	`visitLdcInsn(java.lang.Number value)`
`void`	`visitLdcInsn(java.lang.String value)`
`void`	`visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels)`
`void`	`visitMaxs(int maxStack, int maxLocals)`
`private void`	`visitMethodInsn(int opcode, java.lang.String owner, java.lang.String name, java.lang.String descriptor, boolean isInterface)`
`private void`	`visitSwitchInsn(Label dflt, Label[] labels)`
`private void`	`visitTypeInsn(int opcode, java.lang.String type)`
`void`	`visitVarInsn(int opcode, int var)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- mv
```
MethodWriter mv
```
- symbolTable
```
private final SymbolTable symbolTable
```
  Where the constants used in this MethodWriter must be stored.
- accessFlags
```
private final int accessFlags
```
- nameIndex
```
private final int nameIndex
```
  The name_index field of the method_info JVMS structure.
- name
```
private final java.lang.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 java.lang.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.
- stackMapTableNumberOfEntries
```
int stackMapTableNumberOfEntries
```
  The number_of_entries field of the StackMapTable code attribute.
- stackMapTableEntries
```
private ByteVector stackMapTableEntries
```
  The 'entries' array of the StackMapTable code attribute.
- firstBasicBlock
```
private final 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
```
- previousFrame
```
private int[] previousFrame
```
  The last frame that was written in stackMapTableEntries. This field has the same format as currentFrame.
- currentFrame
```
private int[] currentFrame
```
- hasAsmInstructions
```
boolean hasAsmInstructions
```
- 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).

Constructor Detail
- MethodWriter
```
MethodWriter(SymbolTable symbolTable,
             int access,
             java.lang.String name,
             java.lang.String descriptor,
             int codeInitCapacity)
```
  Constructs a new MethodWriter.
  
  Parameters:
  
  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).

Method Detail

return_
```
public void return_()
```

ireturn
```
public void ireturn()
```

areturn
```
public void areturn()
```

iconst_0
```
public void iconst_0()
```

iconst_1
```
public void iconst_1()
```

iconst_2
```
public void iconst_2()
```

iconst_3
```
public void iconst_3()
```

iconst_4
```
public void iconst_4()
```

iconst_5
```
public void iconst_5()
```

iconst_n
```
public void iconst_n(int n)
```

iconst_m1
```
public void iconst_m1()
```

lconst_0
```
public void lconst_0()
```

lcmp
```
public void lcmp()
```

land
```
public void land()
```

iadd
```
public void iadd()
```

isub
```
public void isub()
```

imul
```
public void imul()
```

bastore
```
public void bastore()
```

castore
```
public void castore()
```

aconst_null
```
public void aconst_null()
```

ixor
```
public void ixor()
```

ineg
```
public void ineg()
```

lor
```
public void lor()
```

swap
```
public void swap()
```

arraylength
```
public void arraylength()
```

l2i
```
public void l2i()
```

i2l
```
public void i2l()
```

i2f
```
public void i2f()
```

i2d
```
public void i2d()
```

cmpWithZero

public void cmpWithZero(java.lang.Class<?> fieldClass)

lxor
```
public void lxor()
```

lushr
```
public void lushr()
```

aaload
```
public void aaload()
```

aastore
```
public void aastore()
```

visitInsn
```
private void visitInsn(int opcode)
```

sipush
```
public void sipush(int operand)
```

bipush
```
public void bipush(int operand)
```

visitIntInsn

private void visitIntInsn(int opcode,
                          int operand)

loadLocal

public void loadLocal(java.lang.Class<?> cls,
                      int var)

storeLocal

public void storeLocal(java.lang.Class<?> cls,
                       int var)

aload
```
public void aload(int var)
```

astore
```
public void astore(int var)
```

iload
```
public void iload(int var)
```

istore
```
public void istore(int var)
```

lload
```
public void lload(int var)
```

lstore
```
public void lstore(int var)
```

fstore
```
public void fstore(int var)
```

dstore
```
public void dstore(int var)
```

dup
```
public void dup()
```

dup

public void dup(java.lang.Class<?> fieldClass)

dup2
```
public void dup2()
```

pop
```
public void pop()
```

visitVarInsn

public void visitVarInsn(int opcode,
                         int var)

checkcast

public void checkcast(java.lang.String type)

new_

public void new_(java.lang.String type)

anewArray

public void anewArray(java.lang.String type)

instanceOf

public void instanceOf(java.lang.String type)

visitTypeInsn

private void visitTypeInsn(int opcode,
                           java.lang.String type)

getfield

public void getfield(java.lang.String owner,
                     java.lang.String name,
                     java.lang.String descriptor)

putfield

public void putfield(java.lang.String owner,
                     java.lang.String name,
                     java.lang.String descriptor)

getstatic

public void getstatic(java.lang.String owner,
                      java.lang.String name,
                      java.lang.String descriptor)

visitFieldInsn

private void visitFieldInsn(int opcode,
                            java.lang.String owner,
                            java.lang.String name,
                            java.lang.String descriptor)

invokestatic

public void invokestatic(java.lang.String owner,
                         java.lang.String name,
                         java.lang.String descriptor)

invokestatic

public void invokestatic(java.lang.String owner,
                         java.lang.String name,
                         java.lang.String descriptor,
                         boolean isInterface)

invokevirtual

public void invokevirtual(java.lang.String owner,
                          java.lang.String name,
                          java.lang.String descriptor)

invokeinterface

public void invokeinterface(java.lang.String owner,
                            java.lang.String name,
                            java.lang.String descriptor)

invokespecial

public void invokespecial(java.lang.String owner,
                          java.lang.String name,
                          java.lang.String descriptor)

visitMethodInsn

private void visitMethodInsn(int opcode,
                             java.lang.String owner,
                             java.lang.String name,
                             java.lang.String descriptor,
                             boolean isInterface)

ifeq
```
public void ifeq(Label label)
```

ifne
```
public void ifne(Label label)
```

ifge
```
public void ifge(Label label)
```

ifnull
```
public void ifnull(Label label)
```

if_icmpeq
```
public void if_icmpeq(Label label)
```

if_acmpeq
```
public void if_acmpeq(Label label)
```

if_acmpne
```
public void if_acmpne(Label label)
```

goto_
```
public void goto_(Label label)
```

ifnonnull
```
public void ifnonnull(Label label)
```

if_icmpge
```
public void if_icmpge(Label label)
```

if_icmple
```
public void if_icmple(Label label)
```

if_icmpne
```
public void if_icmpne(Label label)
```

visitJumpInsn

private void visitJumpInsn(int opcode,
                           Label label)

visitLabel
```
public void visitLabel(Label label)
```

visitLdcInsn

public void visitLdcInsn(java.lang.String value)

visitLdcInsn

public void visitLdcInsn(java.lang.Class value)

visitLdcInsn

public void visitLdcInsn(java.lang.Number value)

visitLdcInsn
```
public void visitLdcInsn(int value)
```

visitLdcInsn
```
public void visitLdcInsn(long value)
```

visitIincInsn

public void visitIincInsn(int var,
                          int increment)

visitLookupSwitchInsn

public void visitLookupSwitchInsn(Label dflt,
                                  int[] keys,
                                  Label[] labels)

visitSwitchInsn

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

visitMaxs

public void visitMaxs(int maxStack,
                      int maxLocals)

addSuccessorToCurrentBasicBlock
```
private void addSuccessorToCurrentBasicBlock(Label successor)
```
Adds a successor to currentBasicBlock in the control flow graph.

Parameters:

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.

Parameters:

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.

Returns:

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.

Parameters:

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.

Parameters:

start - index of the first type in currentFrame to write.

end - index of last type in currentFrame to write (exclusive).

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.

Returns:

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.

Parameters:

output - where the method_info structure must be put.

Class MethodWriter

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

mv

symbolTable

accessFlags

nameIndex

name

descriptorIndex

descriptor

maxStack

maxLocals

code

stackMapTableNumberOfEntries

stackMapTableEntries

firstBasicBlock

lastBasicBlock

currentBasicBlock

previousFrame

currentFrame

hasAsmInstructions

lastBytecodeOffset

Constructor Detail

MethodWriter

Method Detail

return_

ireturn

areturn

iconst_0

iconst_1

iconst_2

iconst_3

iconst_4

iconst_5

iconst_n

iconst_m1

lconst_0

lcmp

land

iadd

isub

imul

bastore

castore

aconst_null

ixor

ineg

lor

swap

arraylength

l2i

i2l

i2f

i2d

cmpWithZero

lxor

lushr

aaload

aastore

visitInsn

sipush

bipush

visitIntInsn

loadLocal

storeLocal

aload

astore

iload

istore

lload

lstore

fstore

dstore

dup

dup

dup2

pop