diff options
Diffstat (limited to 'third_party/java/proguard/proguard5.3.3/src/proguard/evaluation/BasicBranchUnit.java')
-rw-r--r-- | third_party/java/proguard/proguard5.3.3/src/proguard/evaluation/BasicBranchUnit.java | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/evaluation/BasicBranchUnit.java b/third_party/java/proguard/proguard5.3.3/src/proguard/evaluation/BasicBranchUnit.java new file mode 100644 index 0000000000..ae07632f74 --- /dev/null +++ b/third_party/java/proguard/proguard5.3.3/src/proguard/evaluation/BasicBranchUnit.java @@ -0,0 +1,126 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare + * + * 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; + } +} |