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Diffstat (limited to 'src/proguard/optimize/info/ReadWriteFieldMarker.java')
-rw-r--r-- | src/proguard/optimize/info/ReadWriteFieldMarker.java | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/src/proguard/optimize/info/ReadWriteFieldMarker.java b/src/proguard/optimize/info/ReadWriteFieldMarker.java deleted file mode 100644 index ea98d3e..0000000 --- a/src/proguard/optimize/info/ReadWriteFieldMarker.java +++ /dev/null @@ -1,163 +0,0 @@ -/* - * ProGuard -- shrinking, optimization, obfuscation, and preverification - * of Java bytecode. - * - * Copyright (c) 2002-2014 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.info; - -import proguard.classfile.*; -import proguard.classfile.attribute.CodeAttribute; -import proguard.classfile.constant.*; -import proguard.classfile.constant.visitor.ConstantVisitor; -import proguard.classfile.instruction.*; -import proguard.classfile.instruction.visitor.InstructionVisitor; -import proguard.classfile.util.SimplifiedVisitor; -import proguard.classfile.visitor.MemberVisitor; - -/** - * This InstructionVisitor marks all fields that are write-only. - * - * @author Eric Lafortune - */ -public class ReadWriteFieldMarker -extends SimplifiedVisitor -implements InstructionVisitor, - ConstantVisitor, - MemberVisitor -{ - // Parameters for the visitor methods. - private boolean reading = true; - private boolean writing = true; - - - // Implementations for InstructionVisitor. - - public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {} - - - public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction) - { - byte opcode = constantInstruction.opcode; - - // Check for instructions that involve fields. - switch (opcode) - { - case InstructionConstants.OP_LDC: - case InstructionConstants.OP_LDC_W: - // Mark the field, if any, as being read from and written to. - reading = true; - writing = true; - clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this); - break; - - case InstructionConstants.OP_GETSTATIC: - case InstructionConstants.OP_GETFIELD: - // Mark the field as being read from. - reading = true; - writing = false; - clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this); - break; - - case InstructionConstants.OP_PUTSTATIC: - case InstructionConstants.OP_PUTFIELD: - // Mark the field as being written to. - reading = false; - writing = true; - clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this); - break; - } - } - - - // Implementations for ConstantVisitor. - - public void visitAnyConstant(Clazz clazz, Constant constant) {} - - - public void visitStringConstant(Clazz clazz, StringConstant stringConstant) - { - // Mark the referenced field, if any. - stringConstant.referencedMemberAccept(this); - } - - - public void visitFieldrefConstant(Clazz clazz, FieldrefConstant fieldrefConstant) - { - // Mark the referenced field. - fieldrefConstant.referencedMemberAccept(this); - } - - - // Implementations for MemberVisitor. - - public void visitAnyMember(Clazz Clazz, Member member) {} - - - public void visitProgramField(ProgramClass programClass, ProgramField programField) - { - // Mark the field if it is being read from. - if (reading) - { - markAsRead(programField); - } - - // Mark the field if it is being written to. - if (writing) - { - markAsWritten(programField); - } - } - - - // Small utility methods. - - private static void markAsRead(Field field) - { - FieldOptimizationInfo info = FieldOptimizationInfo.getFieldOptimizationInfo(field); - if (info != null) - { - info.setRead(); - } - } - - - public static boolean isRead(Field field) - { - FieldOptimizationInfo info = FieldOptimizationInfo.getFieldOptimizationInfo(field); - return info == null || - info.isRead(); - } - - - private static void markAsWritten(Field field) - { - FieldOptimizationInfo info = FieldOptimizationInfo.getFieldOptimizationInfo(field); - if (info != null) - { - info.setWritten(); - } - } - - - public static boolean isWritten(Field field) - { - FieldOptimizationInfo info = FieldOptimizationInfo.getFieldOptimizationInfo(field); - return info == null || - info.isWritten(); - } -} |