proguard.optimize.peephole
Class PushPopRemover

java.lang.Object
  proguard.optimize.peephole.PushPopRemover

All Implemented Interfaces:

InstructionVisitor

public class PushPopRemover

extends Object

implements InstructionVisitor

This InstructionVisitor deletes all push/pop instruction pairs. In this context, push instructions are instructions that push values onto the stack, like dup and load instructions.

Constructor Summary

PushPopRemover(BranchTargetFinder branchTargetFinder, CodeAttrInfoEditor codeAttrInfoEditor)
Creates a new PushPopRemover.

Method Summary

void	visitBranchInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, BranchInstruction branchInstruction)
void	visitCpInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, CpInstruction cpInstruction)
void	visitLookUpSwitchInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, LookUpSwitchInstruction lookUpSwitchInstruction)
void	visitSimpleInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, SimpleInstruction simpleInstruction)
void	visitTableSwitchInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, TableSwitchInstruction tableSwitchInstruction)
void	visitVariableInstruction(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, int offset, VariableInstruction variableInstruction)

Methods inherited from class java.lang.Object

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

Constructor Detail

PushPopRemover

public PushPopRemover(BranchTargetFinder branchTargetFinder,
                      CodeAttrInfoEditor codeAttrInfoEditor)

Creates a new PushPopRemover.

Parameters:

branchTargetFinder - a branch target finder that has been initialized to indicate branch targets in the visited code.

codeAttrInfoEditor - a code editor that can be used for accumulating changes to the code.

Method Detail

visitCpInstruction

public void visitCpInstruction(ClassFile classFile,
                               MethodInfo methodInfo,
                               CodeAttrInfo codeAttrInfo,
                               int offset,
                               CpInstruction cpInstruction)

Specified by:

visitCpInstruction in interface InstructionVisitor

visitBranchInstruction

public void visitBranchInstruction(ClassFile classFile,
                                   MethodInfo methodInfo,
                                   CodeAttrInfo codeAttrInfo,
                                   int offset,
                                   BranchInstruction branchInstruction)

Specified by:

visitBranchInstruction in interface InstructionVisitor

visitTableSwitchInstruction

public void visitTableSwitchInstruction(ClassFile classFile,
                                        MethodInfo methodInfo,
                                        CodeAttrInfo codeAttrInfo,
                                        int offset,
                                        TableSwitchInstruction tableSwitchInstruction)

Specified by:

visitTableSwitchInstruction in interface InstructionVisitor

visitLookUpSwitchInstruction

public void visitLookUpSwitchInstruction(ClassFile classFile,
                                         MethodInfo methodInfo,
                                         CodeAttrInfo codeAttrInfo,
                                         int offset,
                                         LookUpSwitchInstruction lookUpSwitchInstruction)

Specified by:

visitLookUpSwitchInstruction in interface InstructionVisitor

visitSimpleInstruction

public void visitSimpleInstruction(ClassFile classFile,
                                   MethodInfo methodInfo,
                                   CodeAttrInfo codeAttrInfo,
                                   int offset,
                                   SimpleInstruction simpleInstruction)

Specified by:

visitSimpleInstruction in interface InstructionVisitor

visitVariableInstruction

public void visitVariableInstruction(ClassFile classFile,
                                     MethodInfo methodInfo,
                                     CodeAttrInfo codeAttrInfo,
                                     int offset,
                                     VariableInstruction variableInstruction)

Specified by:

visitVariableInstruction in interface InstructionVisitor