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Diffstat (limited to 'src/proguard/classfile/visitor/ExceptionHandlerFilter.java')
-rw-r--r-- | src/proguard/classfile/visitor/ExceptionHandlerFilter.java | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/proguard/classfile/visitor/ExceptionHandlerFilter.java b/src/proguard/classfile/visitor/ExceptionHandlerFilter.java new file mode 100644 index 0000000..a90fb56 --- /dev/null +++ b/src/proguard/classfile/visitor/ExceptionHandlerFilter.java @@ -0,0 +1,70 @@ +/* + * 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.classfile.visitor; + +import proguard.classfile.*; +import proguard.classfile.attribute.*; +import proguard.classfile.attribute.visitor.ExceptionInfoVisitor; + +/** + * This <code>ExceptionInfoVisitor</code> delegates its visits to another given + * <code>ExceptionInfoVisitor</code>, but only when the visited exception + * targets an instruction in the given range of offsets. + * + * @author Eric Lafortune + */ +public class ExceptionHandlerFilter +implements ExceptionInfoVisitor +{ + private final int startOffset; + private final int endOffset; + private final ExceptionInfoVisitor exceptionInfoVisitor; + + + /** + * Creates a new ExceptionHandlerFilter. + * @param startOffset the start of the instruction offset range. + * @param endOffset the end of the instruction offset range. + * @param exceptionInfoVisitor the ExceptionInfoVisitor to which visits + * will be delegated. + */ + public ExceptionHandlerFilter(int startOffset, + int endOffset, + ExceptionInfoVisitor exceptionInfoVisitor) + { + this.startOffset = startOffset; + this.endOffset = endOffset; + this.exceptionInfoVisitor = exceptionInfoVisitor; + } + + + // Implementations for ExceptionInfoVisitor. + + public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo) + { + int handlerPC = exceptionInfo.u2handlerPC; + if (handlerPC >= startOffset && + handlerPC < endOffset) + { + exceptionInfoVisitor.visitExceptionInfo(clazz, method, codeAttribute, exceptionInfo); + } + } +}
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