org.apache.tajo.org.objectweb.asm.commons

Class RemappingMethodAdapter

java.lang.Object

org.apache.tajo.org.objectweb.asm.MethodVisitor

org.apache.tajo.org.objectweb.asm.commons.LocalVariablesSorter

org.apache.tajo.org.objectweb.asm.commons.RemappingMethodAdapter

Direct Known Subclasses:

MethodOptimizer

public class RemappingMethodAdapter
extends LocalVariablesSorter

A LocalVariablesSorter for type mapping.

Author:

Eugene Kuleshov

Field Summary

Fields

Modifier and Type	Field and Description
protected Remapper	remapper

Fields inherited from class org.apache.tajo.org.objectweb.asm.commons.LocalVariablesSorter

firstLocal, nextLocal

Fields inherited from class org.apache.tajo.org.objectweb.asm.MethodVisitor

api, mv

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RemappingMethodAdapter(int api, int access, String desc, MethodVisitor mv, Remapper remapper)
	RemappingMethodAdapter(int access, String desc, MethodVisitor mv, Remapper remapper)

Method Summary

Methods

Modifier and Type	Method and Description
AnnotationVisitor	visitAnnotation(String desc, boolean visible) Visits an annotation of this method.
AnnotationVisitor	visitAnnotationDefault() Visits the default value of this annotation interface method.
void	visitFieldInsn(int opcode, String owner, String name, String desc) Visits a field instruction.
void	visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) Visits the current state of the local variables and operand stack elements.
void	visitInvokeDynamicInsn(String name, String desc, Handle bsm, Object... bsmArgs) Visits an invokedynamic instruction.
void	visitLdcInsn(Object cst) Visits a LDC instruction.
void	visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) Visits a local variable declaration.
void	visitMethodInsn(int opcode, String owner, String name, String desc) Visits a method instruction.
void	visitMultiANewArrayInsn(String desc, int dims) Visits a MULTIANEWARRAY instruction.
AnnotationVisitor	visitParameterAnnotation(int parameter, String desc, boolean visible) Visits an annotation of a parameter this method.
void	visitTryCatchBlock(Label start, Label end, Label handler, String type) Visits a try catch block.
void	visitTypeInsn(int opcode, String type) Visits a type instruction.

Methods inherited from class org.apache.tajo.org.objectweb.asm.commons.LocalVariablesSorter

newLocal, newLocalMapping, setLocalType, updateNewLocals, visitIincInsn, visitMaxs, visitVarInsn

Methods inherited from class org.apache.tajo.org.objectweb.asm.MethodVisitor

visitAttribute, visitCode, visitEnd, visitInsn, visitIntInsn, visitJumpInsn, visitLabel, visitLineNumber, visitLookupSwitchInsn, visitTableSwitchInsn

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

remapper

protected final Remapper remapper

Constructor Detail

RemappingMethodAdapter

public RemappingMethodAdapter(int access,
                      String desc,
                      MethodVisitor mv,
                      Remapper remapper)

RemappingMethodAdapter

protected RemappingMethodAdapter(int api,
                      int access,
                      String desc,
                      MethodVisitor mv,
                      Remapper remapper)

Method Detail

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.

visitAnnotation

public AnnotationVisitor visitAnnotation(String desc,
                                boolean visible)

Description copied from class: MethodVisitor

Visits an annotation of this method.

Overrides:

visitAnnotation in class MethodVisitor

Parameters:

desc - 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.

visitParameterAnnotation

public AnnotationVisitor visitParameterAnnotation(int parameter,
                                         String desc,
                                         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.

desc - 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.

visitFrame

public void visitFrame(int type,
              int nLocal,
              Object[] local,
              int nStack,
              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 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 ( nStack 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 (nLocal 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 (nLocals 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 LocalVariablesSorter

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.

nLocal - 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).

nStack - 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.

visitFieldInsn

public void visitFieldInsn(int opcode,
                  String owner,
                  String name,
                  String desc)

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 getInternalName).

name - the field's name.

desc - the field's descriptor (see Type).

visitMethodInsn

public void visitMethodInsn(int opcode,
                   String owner,
                   String name,
                   String desc)

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:

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 getInternalName).

name - the method's name.

desc - the method's descriptor (see Type).

visitInvokeDynamicInsn

public void visitInvokeDynamicInsn(String name,
                          String desc,
                          Handle bsm,
                          Object... bsmArgs)

Description copied from class: MethodVisitor

Visits an invokedynamic instruction.

Overrides:

visitInvokeDynamicInsn in class MethodVisitor

Parameters:

name - the method's name.

desc - the method's descriptor (see Type).

bsm - the bootstrap method.

bsmArgs - the bootstrap method constant arguments. Each argument must be an Integer, Float, Long, Double, String, Type or Handle value. This method is allowed to modify the content of the array so a caller should expect that this array may change.

visitTypeInsn

public void visitTypeInsn(int opcode,
                 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 getInternalName).

visitLdcInsn

public void visitLdcInsn(Object cst)

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 {
     // throw an exception
 }
 

Overrides:

visitLdcInsn in class MethodVisitor

Parameters:

cst - 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 49.0, a Type of METHOD sort or a Handle for MethodType and MethodHandle constants, for classes whose version is 51.0.

visitMultiANewArrayInsn

public void visitMultiANewArrayInsn(String desc,
                           int dims)

Description copied from class: MethodVisitor

Visits a MULTIANEWARRAY instruction.

Overrides:

visitMultiANewArrayInsn in class MethodVisitor

Parameters:

desc - an array type descriptor (see Type).

dims - number of dimensions of the array to allocate.

visitTryCatchBlock

public void visitTryCatchBlock(Label start,
                      Label end,
                      Label handler,
                      String type)

Description copied from class: MethodVisitor

Visits a try catch block.

Overrides:

visitTryCatchBlock in class MethodVisitor

Parameters:

start - beginning of the exception handler's scope (inclusive).

end - end of the exception handler's scope (exclusive).

handler - beginning of the exception handler's code.

type - internal name of the type of exceptions handled by the handler, or null to catch any exceptions (for "finally" blocks).

visitLocalVariable

public void visitLocalVariable(String name,
                      String desc,
                      String signature,
                      Label start,
                      Label end,
                      int index)

Description copied from class: MethodVisitor

Visits a local variable declaration.

Overrides:

visitLocalVariable in class LocalVariablesSorter

Parameters:

name - the name of a local variable.

desc - 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.