Rebasing the Inflater support on jzlib which, unlike GNU ClassPath, has correct implementation of Huffman code. Making the implementation more easily testable by turning Inflater and ZipInputStream into pure delegates. Current implementation is going to need proper long support.
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26 package org.apidesign.javap;
28 import static org.apidesign.javap.RuntimeConstants.ITEM_Integer;
29 import static org.apidesign.javap.RuntimeConstants.ITEM_Float;
30 import static org.apidesign.javap.RuntimeConstants.ITEM_Double;
31 import static org.apidesign.javap.RuntimeConstants.ITEM_Long;
32 import static org.apidesign.javap.RuntimeConstants.ITEM_Object;
34 public final class StackMapIterator {
35 private final StackMapTableData[] stackMapTable;
36 private final TypeArray argTypes;
37 private final TypeArray localTypes;
38 private final TypeArray stackTypes;
40 private int nextFrameIndex;
41 private int lastFrameByteCodeOffset;
43 private int byteCodeOffset;
45 StackMapIterator(final MethodData methodData) {
46 this(methodData.getStackMapTable(),
47 methodData.getInternalSig(),
48 methodData.isStatic());
51 StackMapIterator(final StackMapTableData[] stackMapTable,
52 final String methodSignature,
53 final boolean isStaticMethod) {
54 this.stackMapTable = (stackMapTable != null)
56 : new StackMapTableData[0];
58 argTypes = getArgTypes(methodSignature, isStaticMethod);
59 localTypes = new TypeArray();
60 stackTypes = new TypeArray();
62 localTypes.addAll(argTypes);
64 lastFrameByteCodeOffset = -1;
68 public String getFrameAsString() {
69 return (nextFrameIndex == 0)
70 ? StackMapTableData.toString("INITIAL", 0, null, null)
71 : stackMapTable[nextFrameIndex - 1].toString();
74 public int getFrameIndex() {
75 return nextFrameIndex;
78 public TypeArray getFrameStack() {
82 public TypeArray getFrameLocals() {
86 public TypeArray getArguments() {
90 public void advanceBy(final int numByteCodes) {
91 if (numByteCodes < 0) {
92 throw new IllegalStateException("Forward only iterator");
95 byteCodeOffset += numByteCodes;
96 while ((nextFrameIndex < stackMapTable.length)
97 && ((byteCodeOffset - lastFrameByteCodeOffset)
98 >= (stackMapTable[nextFrameIndex].offsetDelta
100 final StackMapTableData nextFrame = stackMapTable[nextFrameIndex];
102 lastFrameByteCodeOffset += nextFrame.offsetDelta + 1;
103 nextFrame.applyTo(localTypes, stackTypes);
109 public void advanceTo(final int nextByteCodeOffset) {
110 advanceBy(nextByteCodeOffset - byteCodeOffset);
113 private static TypeArray getArgTypes(final String methodSignature,
114 final boolean isStaticMethod) {
115 final TypeArray argTypes = new TypeArray();
117 if (!isStaticMethod) {
118 argTypes.add(ITEM_Object);
121 if (methodSignature.charAt(0) != '(') {
122 throw new IllegalArgumentException("Invalid method signature");
125 final int length = methodSignature.length();
126 boolean skipType = false;
128 for (int i = 1; i < length; ++i) {
129 switch (methodSignature.charAt(i)) {
135 argType = ITEM_Integer;
141 argType = ITEM_Float;
144 argType = ITEM_Double;
147 i = methodSignature.indexOf(';', i + 1);
149 throw new IllegalArgumentException(
150 "Invalid method signature");
152 argType = ITEM_Object;
156 // not interested in the return value type
160 argTypes.add(ITEM_Object);
166 throw new IllegalArgumentException(
167 "Invalid method signature");
171 argTypes.add(argType);