diff options
Diffstat (limited to 'src/proguard/optimize/peephole/InstructionSequencesReplacer.java')
| -rw-r--r-- | src/proguard/optimize/peephole/InstructionSequencesReplacer.java | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/proguard/optimize/peephole/InstructionSequencesReplacer.java b/src/proguard/optimize/peephole/InstructionSequencesReplacer.java new file mode 100644 index 0000000..f12b51a --- /dev/null +++ b/src/proguard/optimize/peephole/InstructionSequencesReplacer.java @@ -0,0 +1,138 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +package proguard.optimize.peephole; + +import proguard.classfile.constant.Constant; +import proguard.classfile.editor.CodeAttributeEditor; +import proguard.classfile.instruction.Instruction; +import proguard.classfile.instruction.visitor.*; + +/** + * This InstructionVisitor replaces multiple instruction sequences at once. + * + * @see InstructionSequenceReplacer + * @author Eric Lafortune + */ +public class InstructionSequencesReplacer +extends MultiInstructionVisitor +implements InstructionVisitor +{ + private static final int PATTERN_INDEX = 0; + private static final int REPLACEMENT_INDEX = 1; + + + /** + * Creates a new InstructionSequencesReplacer. + * @param patternConstants any constants referenced by the pattern + * instruction. + * @param instructionSequences the instruction sequences to be replaced, + * with subsequently the sequence pair index, + * the patten/replacement index (0 or 1), + * and the instruction index in the sequence. + * @param branchTargetFinder a branch target finder that has been + * initialized to indicate branch targets + * in the visited code. + * @param codeAttributeEditor a code editor that can be used for + * accumulating changes to the code. + */ + public InstructionSequencesReplacer(Constant[] patternConstants, + Instruction[][][] instructionSequences, + BranchTargetFinder branchTargetFinder, + CodeAttributeEditor codeAttributeEditor) + { + this(patternConstants, + instructionSequences, + branchTargetFinder, + codeAttributeEditor, + null); + } + + + /** + * Creates a new InstructionSequenceReplacer. + * @param patternConstants any constants referenced by the pattern + * instruction. + * @param instructionSequences the instruction sequences to be replaced, + * with subsequently the sequence pair index, + * the patten/replacement index (0 or 1), + * and the instruction index in the sequence. + * @param branchTargetFinder a branch target finder that has been + * initialized to indicate branch targets + * in the visited code. + * @param codeAttributeEditor a code editor that can be used for + * accumulating changes to the code. + * @param extraInstructionVisitor an optional extra visitor for all deleted + * load instructions. + */ + public InstructionSequencesReplacer(Constant[] patternConstants, + Instruction[][][] instructionSequences, + BranchTargetFinder branchTargetFinder, + CodeAttributeEditor codeAttributeEditor, + InstructionVisitor extraInstructionVisitor) + { + super(createInstructionSequenceReplacers(patternConstants, + instructionSequences, + branchTargetFinder, + codeAttributeEditor, + extraInstructionVisitor)); + } + + + /** + * Creates an array of InstructionSequenceReplacer instances. + * @param patternConstants any constants referenced by the pattern + * instruction. + * @param instructionSequences the instruction sequences to be replaced, + * with subsequently the sequence pair index, + * the from/to index (0 or 1), and the + * instruction index in the sequence. + * @param branchTargetFinder a branch target finder that has been + * initialized to indicate branch targets + * in the visited code. + * @param codeAttributeEditor a code editor that can be used for + * accumulating changes to the code. + * @param extraInstructionVisitor an optional extra visitor for all deleted + * load instructions. + */ + private static InstructionVisitor[] createInstructionSequenceReplacers(Constant[] patternConstants, + Instruction[][][] instructionSequences, + BranchTargetFinder branchTargetFinder, + CodeAttributeEditor codeAttributeEditor, + InstructionVisitor extraInstructionVisitor) + { + InstructionVisitor[] instructionSequenceReplacers = + new InstructionSequenceReplacer[instructionSequences.length]; + + for (int index = 0; index < instructionSequenceReplacers.length; index++) + { + Instruction[][] instructionSequencePair = instructionSequences[index]; + instructionSequenceReplacers[index] = + new InstructionSequenceReplacer(patternConstants, + instructionSequencePair[PATTERN_INDEX], + instructionSequencePair[REPLACEMENT_INDEX], + branchTargetFinder, + codeAttributeEditor, + extraInstructionVisitor); + } + + return instructionSequenceReplacers; + } +} |