| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2013 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.evaluation; |
| |
| import proguard.classfile.Clazz; |
| import proguard.classfile.attribute.CodeAttribute; |
| import proguard.evaluation.value.InstructionOffsetValue; |
| |
| /** |
| * This BranchUnit remembers the branch unit commands that are invoked on it. |
| * I doesn't consider conditions when branching. |
| * |
| * @author Eric Lafortune |
| */ |
| public class BasicBranchUnit |
| implements BranchUnit |
| { |
| private boolean wasCalled; |
| private InstructionOffsetValue traceBranchTargets; |
| |
| |
| /** |
| * Resets the flag that tells whether any of the branch unit commands was |
| * called. |
| */ |
| public void resetCalled() |
| { |
| wasCalled = false; |
| } |
| |
| /** |
| * Sets the flag that tells whether any of the branch unit commands was |
| * called. |
| */ |
| protected void setCalled() |
| { |
| wasCalled = true; |
| } |
| |
| /** |
| * Returns whether any of the branch unit commands was called. |
| */ |
| public boolean wasCalled() |
| { |
| return wasCalled; |
| } |
| |
| |
| /** |
| * Sets the initial branch targets, which will be updated as the branch |
| * methods of the branch unit are called. |
| */ |
| public void setTraceBranchTargets(InstructionOffsetValue branchTargets) |
| { |
| this.traceBranchTargets = branchTargets; |
| } |
| |
| public InstructionOffsetValue getTraceBranchTargets() |
| { |
| return traceBranchTargets; |
| } |
| |
| |
| // Implementations for BranchUnit. |
| |
| public void branch(Clazz clazz, |
| CodeAttribute codeAttribute, |
| int offset, |
| int branchTarget) |
| { |
| // Override the branch targets. |
| traceBranchTargets = new InstructionOffsetValue(branchTarget); |
| |
| wasCalled = true; |
| } |
| |
| |
| public void branchConditionally(Clazz clazz, |
| CodeAttribute codeAttribute, |
| int offset, |
| int branchTarget, |
| int conditional) |
| { |
| // Accumulate the branch targets. |
| traceBranchTargets = |
| traceBranchTargets.generalize(new InstructionOffsetValue(branchTarget)).instructionOffsetValue(); |
| |
| wasCalled = true; |
| } |
| |
| |
| public void returnFromMethod() |
| { |
| // Stop processing this block. |
| traceBranchTargets = InstructionOffsetValue.EMPTY_VALUE; |
| |
| wasCalled = true; |
| } |
| |
| |
| public void throwException() |
| { |
| // Stop processing this block. |
| traceBranchTargets = InstructionOffsetValue.EMPTY_VALUE; |
| |
| wasCalled = true; |
| } |
| } |