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/*
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* Copyright (c) 2005, 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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import java.io.*;
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import static org.apidesign.javap.RuntimeConstants.*;
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/* represents one entry of StackMapTable attribute
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*/
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class StackMapTableData {
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final int frameType;
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int offsetDelta;
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StackMapTableData(int frameType) {
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this.frameType = frameType;
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}
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static class SameFrame extends StackMapTableData {
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SameFrame(int frameType, int offsetDelta) {
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super(frameType);
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this.offsetDelta = offsetDelta;
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}
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}
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static class SameLocals1StackItem extends StackMapTableData {
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final int[] stack;
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SameLocals1StackItem(int frameType, int offsetDelta, int[] stack) {
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super(frameType);
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this.offsetDelta = offsetDelta;
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this.stack = stack;
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}
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}
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static class ChopFrame extends StackMapTableData {
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ChopFrame(int frameType, int offsetDelta) {
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super(frameType);
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this.offsetDelta = offsetDelta;
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}
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}
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static class AppendFrame extends StackMapTableData {
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final int[] locals;
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AppendFrame(int frameType, int offsetDelta, int[] locals) {
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super(frameType);
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this.offsetDelta = offsetDelta;
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this.locals = locals;
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}
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}
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static class FullFrame extends StackMapTableData {
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final int[] locals;
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final int[] stack;
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FullFrame(int offsetDelta, int[] locals, int[] stack) {
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super(FULL_FRAME);
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this.offsetDelta = offsetDelta;
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this.locals = locals;
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this.stack = stack;
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}
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}
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static StackMapTableData getInstance(DataInputStream in, MethodData method)
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throws IOException {
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int frameType = in.readUnsignedByte();
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if (frameType < SAME_FRAME_BOUND) {
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// same_frame
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return new SameFrame(frameType, frameType);
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} else if (SAME_FRAME_BOUND <= frameType && frameType < SAME_LOCALS_1_STACK_ITEM_BOUND) {
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// same_locals_1_stack_item_frame
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// read additional single stack element
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return new SameLocals1StackItem(frameType,
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(frameType - SAME_FRAME_BOUND),
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StackMapData.readTypeArray(in, 1, method));
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} else if (frameType == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
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// same_locals_1_stack_item_extended
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return new SameLocals1StackItem(frameType,
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in.readUnsignedShort(),
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StackMapData.readTypeArray(in, 1, method));
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} else if (SAME_LOCALS_1_STACK_ITEM_EXTENDED < frameType && frameType < SAME_FRAME_EXTENDED) {
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// chop_frame or same_frame_extended
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return new ChopFrame(frameType, in.readUnsignedShort());
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} else if (frameType == SAME_FRAME_EXTENDED) {
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// chop_frame or same_frame_extended
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return new SameFrame(frameType, in.readUnsignedShort());
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} else if (SAME_FRAME_EXTENDED < frameType && frameType < FULL_FRAME) {
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// append_frame
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return new AppendFrame(frameType, in.readUnsignedShort(),
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StackMapData.readTypeArray(in, frameType - SAME_FRAME_EXTENDED, method));
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} else if (frameType == FULL_FRAME) {
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// full_frame
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int offsetDelta = in.readUnsignedShort();
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int locals_size = in.readUnsignedShort();
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int[] locals = StackMapData.readTypeArray(in, locals_size, method);
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int stack_size = in.readUnsignedShort();
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int[] stack = StackMapData.readTypeArray(in, stack_size, method);
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return new FullFrame(offsetDelta, locals, stack);
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} else {
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throw new ClassFormatError("unrecognized frame_type in StackMapTable");
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}
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}
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}
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