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/*
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* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.apidesign.javap;
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public final class StackMapIterator {
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private static final StackMapTableData INITIAL_FRAME =
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new StackMapTableData(-1) {
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@Override
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void applyTo(TypeArray localTypes, TypeArray stackTypes) {
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localTypes.clear();
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stackTypes.clear();
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}
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@Override
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public String toString() {
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return toString("INITIAL", 0, null, null);
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}
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};
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private final StackMapTableData[] stackMapTable;
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private final TypeArray localTypes;
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private final TypeArray stackTypes;
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private int nextFrameIndex;
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private int lastFrameByteCodeOffset;
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private int byteCodeOffset;
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StackMapIterator(final StackMapTableData[] stackMapTable) {
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this.stackMapTable = (stackMapTable != null)
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? stackMapTable
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: new StackMapTableData[0];
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localTypes = new TypeArray();
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stackTypes = new TypeArray();
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lastFrameByteCodeOffset = -1;
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advanceBy(0);
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}
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public String getFrameAsString() {
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return getCurrentFrame().toString();
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}
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public int getFrameIndex() {
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return nextFrameIndex;
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}
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public TypeArray getFrameStack() {
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return stackTypes;
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}
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public void advanceBy(final int numByteCodes) {
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if (numByteCodes < 0) {
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throw new IllegalStateException("Forward only iterator");
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}
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byteCodeOffset += numByteCodes;
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while ((nextFrameIndex < stackMapTable.length)
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&& ((byteCodeOffset - lastFrameByteCodeOffset)
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>= (stackMapTable[nextFrameIndex].offsetDelta
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+ 1))) {
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final StackMapTableData nextFrame = stackMapTable[nextFrameIndex];
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lastFrameByteCodeOffset += nextFrame.offsetDelta + 1;
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nextFrame.applyTo(localTypes, stackTypes);
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++nextFrameIndex;
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}
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}
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public void advanceTo(final int nextByteCodeOffset) {
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advanceBy(nextByteCodeOffset - byteCodeOffset);
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}
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private StackMapTableData getCurrentFrame() {
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return (nextFrameIndex == 0)
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? INITIAL_FRAME
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: stackMapTable[nextFrameIndex - 1];
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}
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}
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