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1.1.4
by Sam Clegg
Import upstream version 4.1 |
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/*
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* ProGuard -- shrinking, optimization, obfuscation, and preverification
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* of Java bytecode.
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*
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1.2.7
by komal Sukhani
Import upstream version 5.2.1 |
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* Copyright (c) 2002-2015 Eric Lafortune @ GuardSquare
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1.1.4
by Sam Clegg
Import upstream version 4.1 |
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package proguard.optimize.peephole; |
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import proguard.classfile.constant.Constant; |
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import proguard.classfile.editor.CodeAttributeEditor; |
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import proguard.classfile.instruction.Instruction; |
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import proguard.classfile.instruction.visitor.*; |
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/**
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* This InstructionVisitor replaces multiple instruction sequences at once.
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*
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* @see InstructionSequenceReplacer
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* @author Eric Lafortune
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*/
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public class InstructionSequencesReplacer |
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extends MultiInstructionVisitor |
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implements InstructionVisitor |
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{
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private static final int PATTERN_INDEX = 0; |
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private static final int REPLACEMENT_INDEX = 1; |
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/**
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* Creates a new InstructionSequencesReplacer.
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* @param patternConstants any constants referenced by the pattern
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* instruction.
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* @param instructionSequences the instruction sequences to be replaced,
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* with subsequently the sequence pair index,
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* the patten/replacement index (0 or 1),
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* and the instruction index in the sequence.
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* @param branchTargetFinder a branch target finder that has been
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* initialized to indicate branch targets
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* in the visited code.
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* @param codeAttributeEditor a code editor that can be used for
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* accumulating changes to the code.
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*/
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public InstructionSequencesReplacer(Constant[] patternConstants, |
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Instruction[][][] instructionSequences, |
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BranchTargetFinder branchTargetFinder, |
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CodeAttributeEditor codeAttributeEditor) |
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{
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this(patternConstants, |
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instructionSequences, |
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branchTargetFinder, |
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codeAttributeEditor, |
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null); |
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}
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/**
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* Creates a new InstructionSequenceReplacer.
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* @param patternConstants any constants referenced by the pattern
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* instruction.
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* @param instructionSequences the instruction sequences to be replaced,
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* with subsequently the sequence pair index,
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* the patten/replacement index (0 or 1),
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* and the instruction index in the sequence.
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* @param branchTargetFinder a branch target finder that has been
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* initialized to indicate branch targets
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* in the visited code.
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* @param codeAttributeEditor a code editor that can be used for
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* accumulating changes to the code.
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* @param extraInstructionVisitor an optional extra visitor for all deleted
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* load instructions.
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*/
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public InstructionSequencesReplacer(Constant[] patternConstants, |
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Instruction[][][] instructionSequences, |
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BranchTargetFinder branchTargetFinder, |
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CodeAttributeEditor codeAttributeEditor, |
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InstructionVisitor extraInstructionVisitor) |
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{
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super(createInstructionSequenceReplacers(patternConstants, |
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instructionSequences, |
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branchTargetFinder, |
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codeAttributeEditor, |
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extraInstructionVisitor)); |
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}
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/**
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* Creates an array of InstructionSequenceReplacer instances.
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* @param patternConstants any constants referenced by the pattern
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* instruction.
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* @param instructionSequences the instruction sequences to be replaced,
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* with subsequently the sequence pair index,
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* the from/to index (0 or 1), and the
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* instruction index in the sequence.
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* @param branchTargetFinder a branch target finder that has been
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* initialized to indicate branch targets
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* in the visited code.
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* @param codeAttributeEditor a code editor that can be used for
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* accumulating changes to the code.
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* @param extraInstructionVisitor an optional extra visitor for all deleted
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* load instructions.
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*/
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private static InstructionVisitor[] createInstructionSequenceReplacers(Constant[] patternConstants, |
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Instruction[][][] instructionSequences, |
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BranchTargetFinder branchTargetFinder, |
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CodeAttributeEditor codeAttributeEditor, |
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InstructionVisitor extraInstructionVisitor) |
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{
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InstructionVisitor[] instructionSequenceReplacers = |
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new InstructionSequenceReplacer[instructionSequences.length]; |
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for (int index = 0; index < instructionSequenceReplacers.length; index++) |
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{
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Instruction[][] instructionSequencePair = instructionSequences[index]; |
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instructionSequenceReplacers[index] = |
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new InstructionSequenceReplacer(patternConstants, |
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instructionSequencePair[PATTERN_INDEX], |
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instructionSequencePair[REPLACEMENT_INDEX], |
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branchTargetFinder, |
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codeAttributeEditor, |
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extraInstructionVisitor); |
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}
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return instructionSequenceReplacers; |
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}
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}
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