1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/javap/src/main/java/org/apidesign/javap/StackMapTableData.java Fri Nov 16 08:08:36 2012 +0100
1.3 @@ -0,0 +1,126 @@
1.4 +/*
1.5 + * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +
1.30 +package org.apidesign.javap;
1.31 +
1.32 +import java.io.*;
1.33 +
1.34 +import static org.apidesign.javap.RuntimeConstants.*;
1.35 +
1.36 +/* represents one entry of StackMapTable attribute
1.37 + */
1.38 +class StackMapTableData {
1.39 + final int frameType;
1.40 + int offsetDelta;
1.41 +
1.42 + StackMapTableData(int frameType) {
1.43 + this.frameType = frameType;
1.44 + }
1.45 +
1.46 + static class SameFrame extends StackMapTableData {
1.47 + SameFrame(int frameType, int offsetDelta) {
1.48 + super(frameType);
1.49 + this.offsetDelta = offsetDelta;
1.50 + }
1.51 + }
1.52 +
1.53 + static class SameLocals1StackItem extends StackMapTableData {
1.54 + final int[] stack;
1.55 + SameLocals1StackItem(int frameType, int offsetDelta, int[] stack) {
1.56 + super(frameType);
1.57 + this.offsetDelta = offsetDelta;
1.58 + this.stack = stack;
1.59 + }
1.60 + }
1.61 +
1.62 + static class ChopFrame extends StackMapTableData {
1.63 + ChopFrame(int frameType, int offsetDelta) {
1.64 + super(frameType);
1.65 + this.offsetDelta = offsetDelta;
1.66 + }
1.67 + }
1.68 +
1.69 + static class AppendFrame extends StackMapTableData {
1.70 + final int[] locals;
1.71 + AppendFrame(int frameType, int offsetDelta, int[] locals) {
1.72 + super(frameType);
1.73 + this.offsetDelta = offsetDelta;
1.74 + this.locals = locals;
1.75 + }
1.76 + }
1.77 +
1.78 + static class FullFrame extends StackMapTableData {
1.79 + final int[] locals;
1.80 + final int[] stack;
1.81 + FullFrame(int offsetDelta, int[] locals, int[] stack) {
1.82 + super(FULL_FRAME);
1.83 + this.offsetDelta = offsetDelta;
1.84 + this.locals = locals;
1.85 + this.stack = stack;
1.86 + }
1.87 + }
1.88 +
1.89 + static StackMapTableData getInstance(DataInputStream in, MethodData method)
1.90 + throws IOException {
1.91 + int frameType = in.readUnsignedByte();
1.92 +
1.93 + if (frameType < SAME_FRAME_BOUND) {
1.94 + // same_frame
1.95 + return new SameFrame(frameType, frameType);
1.96 + } else if (SAME_FRAME_BOUND <= frameType && frameType < SAME_LOCALS_1_STACK_ITEM_BOUND) {
1.97 + // same_locals_1_stack_item_frame
1.98 + // read additional single stack element
1.99 + return new SameLocals1StackItem(frameType,
1.100 + (frameType - SAME_FRAME_BOUND),
1.101 + StackMapData.readTypeArray(in, 1, method));
1.102 + } else if (frameType == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1.103 + // same_locals_1_stack_item_extended
1.104 + return new SameLocals1StackItem(frameType,
1.105 + in.readUnsignedShort(),
1.106 + StackMapData.readTypeArray(in, 1, method));
1.107 + } else if (SAME_LOCALS_1_STACK_ITEM_EXTENDED < frameType && frameType < SAME_FRAME_EXTENDED) {
1.108 + // chop_frame or same_frame_extended
1.109 + return new ChopFrame(frameType, in.readUnsignedShort());
1.110 + } else if (frameType == SAME_FRAME_EXTENDED) {
1.111 + // chop_frame or same_frame_extended
1.112 + return new SameFrame(frameType, in.readUnsignedShort());
1.113 + } else if (SAME_FRAME_EXTENDED < frameType && frameType < FULL_FRAME) {
1.114 + // append_frame
1.115 + return new AppendFrame(frameType, in.readUnsignedShort(),
1.116 + StackMapData.readTypeArray(in, frameType - SAME_FRAME_EXTENDED, method));
1.117 + } else if (frameType == FULL_FRAME) {
1.118 + // full_frame
1.119 + int offsetDelta = in.readUnsignedShort();
1.120 + int locals_size = in.readUnsignedShort();
1.121 + int[] locals = StackMapData.readTypeArray(in, locals_size, method);
1.122 + int stack_size = in.readUnsignedShort();
1.123 + int[] stack = StackMapData.readTypeArray(in, stack_size, method);
1.124 + return new FullFrame(offsetDelta, locals, stack);
1.125 + } else {
1.126 + throw new ClassFormatError("unrecognized frame_type in StackMapTable");
1.127 + }
1.128 + }
1.129 +}