in src/main/java/org/apache/commons/compress/harmony/unpack200/BcBands.java [183:421]
public void read(final InputStream in) throws IOException, Pack200Exception {
final AttributeLayoutMap attributeDefinitionMap = segment.getAttrDefinitionBands().getAttributeDefinitionMap();
final int classCount = header.getClassCount();
final long[][] methodFlags = segment.getClassBands().getMethodFlags();
int bcCaseCountCount = 0;
int bcByteCount = 0;
int bcShortCount = 0;
int bcLocalCount = 0;
int bcLabelCount = 0;
int bcIntRefCount = 0;
int bcFloatRefCount = 0;
int bcLongRefCount = 0;
int bcDoubleRefCount = 0;
int bcStringRefCount = 0;
int bcClassRefCount = 0;
int bcFieldRefCount = 0;
int bcMethodRefCount = 0;
int bcIMethodRefCount = 0;
int bcThisFieldCount = 0;
int bcSuperFieldCount = 0;
int bcThisMethodCount = 0;
int bcSuperMethodCount = 0;
int bcInitRefCount = 0;
int bcEscCount = 0;
int bcEscRefCount = 0;
final AttributeLayout abstractModifier = attributeDefinitionMap.getAttributeLayout(AttributeLayout.ACC_ABSTRACT, AttributeLayout.CONTEXT_METHOD);
final AttributeLayout nativeModifier = attributeDefinitionMap.getAttributeLayout(AttributeLayout.ACC_NATIVE, AttributeLayout.CONTEXT_METHOD);
methodByteCodePacked = new byte[classCount][][];
final List<Boolean> switchIsTableSwitch = new ArrayList<>();
wideByteCodes = new ArrayList<>();
for (int c = 0; c < classCount; c++) {
final int numberOfMethods = methodFlags[c].length;
methodByteCodePacked[c] = new byte[numberOfMethods][];
for (int m = 0; m < numberOfMethods; m++) {
final long methodFlag = methodFlags[c][m];
if (!abstractModifier.matches(methodFlag) && !nativeModifier.matches(methodFlag)) {
final ByteArrayOutputStream codeBytes = new ByteArrayOutputStream();
byte code;
while ((code = (byte) (0xff & in.read())) != -1) {
codeBytes.write(code);
}
methodByteCodePacked[c][m] = codeBytes.toByteArray();
final int[] codes = new int[methodByteCodePacked[c][m].length];
for (int i = 0; i < codes.length; i++) {
codes[i] = methodByteCodePacked[c][m][i] & 0xff;
}
for (int i = 0; i < methodByteCodePacked[c][m].length; i++) {
final int codePacked = 0xff & methodByteCodePacked[c][m][i];
switch (codePacked) {
case 16: // bipush
case 188: // newarray
bcByteCount++;
break;
case 17: // sipush
bcShortCount++;
break;
case 18: // (a)ldc
case 19: // aldc_w
bcStringRefCount++;
break;
case 234: // ildc
case 237: // ildc_w
bcIntRefCount++;
break;
case 235: // fldc
case 238: // fldc_w
bcFloatRefCount++;
break;
case 197: // multianewarray
bcByteCount++;
// falls-through
case 233: // cldc
case 236: // cldc_w
case 187: // new
case 189: // anewarray
case 192: // checkcast
case 193: // instanceof
bcClassRefCount++;
break;
case 20: // lldc2_w
bcLongRefCount++;
break;
case 239: // dldc2_w
bcDoubleRefCount++;
break;
case 169: // ret
bcLocalCount++;
break;
case 167: // goto
case 168: // jsr
case 200: // goto_w
case 201: // jsr_w
bcLabelCount++;
break;
case 170: // tableswitch
switchIsTableSwitch.add(Boolean.TRUE);
bcCaseCountCount++;
bcLabelCount++;
break;
case 171: // lookupswitch
switchIsTableSwitch.add(Boolean.FALSE);
bcCaseCountCount++;
bcLabelCount++;
break;
case 178: // getstatic
case 179: // putstatic
case 180: // getfield
case 181: // putfield
bcFieldRefCount++;
break;
case 182: // invokevirtual
case 183: // invokespecial
case 184: // invokestatic
bcMethodRefCount++;
break;
case 185: // invokeinterface
bcIMethodRefCount++;
break;
case 202: // getstatic_this
case 203: // putstatic_this
case 204: // getfield_this
case 205: // putfield_this
case 209: // aload_0_getstatic_this
case 210: // aload_0_putstatic_this
case 211: // aload_0_putfield_this
case 212: // aload_0_putfield_this
bcThisFieldCount++;
break;
case 206: // invokevirtual_this
case 207: // invokespecial_this
case 208: // invokestatic_this
case 213: // aload_0_invokevirtual_this
case 214: // aload_0_invokespecial_this
case 215: // aload_0_invokestatic_this
bcThisMethodCount++;
break;
case 216: // getstatic_super
case 217: // putstatic_super
case 218: // getfield_super
case 219: // putfield_super
case 223: // aload_0_getstatic_super
case 224: // aload_0_putstatic_super
case 225: // aload_0_getfield_super
case 226: // aload_0_putfield_super
bcSuperFieldCount++;
break;
case 220: // invokevirtual_super
case 221: // invokespecial_super
case 222: // invokestatic_super
case 227: // aload_0_invokevirtual_super
case 228: // aload_0_invokespecial_super
case 229: // aload_0_invokestatic_super
bcSuperMethodCount++;
break;
case 132: // iinc
bcLocalCount++;
bcByteCount++;
break;
case 196: // wide
final int nextInstruction = 0xff & methodByteCodePacked[c][m][i + 1];
wideByteCodes.add(Integer.valueOf(nextInstruction));
if (nextInstruction == 132) { // iinc
bcLocalCount++;
bcShortCount++;
} else if (endsWithLoad(nextInstruction) || endsWithStore(nextInstruction) || nextInstruction == 169) {
bcLocalCount++;
} else {
segment.log(Segment.LOG_LEVEL_VERBOSE, "Found unhandled " + ByteCode.getByteCode(nextInstruction));
}
i++;
break;
case 230: // invokespecial_this_init
case 231: // invokespecial_super_init
case 232: // invokespecial_new_init
bcInitRefCount++;
break;
case 253: // ref_escape
bcEscRefCount++;
break;
case 254: // byte_escape
bcEscCount++;
break;
default:
if (endsWithLoad(codePacked) || endsWithStore(codePacked)) {
bcLocalCount++;
} else if (startsWithIf(codePacked)) {
bcLabelCount++;
}
}
}
}
}
}
// other bytecode bands
bcCaseCount = decodeBandInt("bc_case_count", in, Codec.UNSIGNED5, bcCaseCountCount);
int bcCaseValueCount = 0;
for (int i = 0; i < bcCaseCount.length; i++) {
final boolean isTableSwitch = switchIsTableSwitch.get(i).booleanValue();
if (isTableSwitch) {
bcCaseValueCount += 1;
} else {
bcCaseValueCount += bcCaseCount[i];
}
}
bcCaseValue = decodeBandInt("bc_case_value", in, Codec.DELTA5, bcCaseValueCount);
// Every case value needs a label. We weren't able to count these
// above, because we didn't know how many cases there were.
// Have to correct it now.
for (int index = 0; index < bcCaseCountCount; index++) {
bcLabelCount += bcCaseCount[index];
}
bcByte = decodeBandInt("bc_byte", in, Codec.BYTE1, bcByteCount);
bcShort = decodeBandInt("bc_short", in, Codec.DELTA5, bcShortCount);
bcLocal = decodeBandInt("bc_local", in, Codec.UNSIGNED5, bcLocalCount);
bcLabel = decodeBandInt("bc_label", in, Codec.BRANCH5, bcLabelCount);
bcIntRef = decodeBandInt("bc_intref", in, Codec.DELTA5, bcIntRefCount);
bcFloatRef = decodeBandInt("bc_floatref", in, Codec.DELTA5, bcFloatRefCount);
bcLongRef = decodeBandInt("bc_longref", in, Codec.DELTA5, bcLongRefCount);
bcDoubleRef = decodeBandInt("bc_doubleref", in, Codec.DELTA5, bcDoubleRefCount);
bcStringRef = decodeBandInt("bc_stringref", in, Codec.DELTA5, bcStringRefCount);
bcClassRef = decodeBandInt("bc_classref", in, Codec.UNSIGNED5, bcClassRefCount);
bcFieldRef = decodeBandInt("bc_fieldref", in, Codec.DELTA5, bcFieldRefCount);
bcMethodRef = decodeBandInt("bc_methodref", in, Codec.UNSIGNED5, bcMethodRefCount);
bcIMethodRef = decodeBandInt("bc_imethodref", in, Codec.DELTA5, bcIMethodRefCount);
bcThisField = decodeBandInt("bc_thisfield", in, Codec.UNSIGNED5, bcThisFieldCount);
bcSuperField = decodeBandInt("bc_superfield", in, Codec.UNSIGNED5, bcSuperFieldCount);
bcThisMethod = decodeBandInt("bc_thismethod", in, Codec.UNSIGNED5, bcThisMethodCount);
bcSuperMethod = decodeBandInt("bc_supermethod", in, Codec.UNSIGNED5, bcSuperMethodCount);
bcInitRef = decodeBandInt("bc_initref", in, Codec.UNSIGNED5, bcInitRefCount);
bcEscRef = decodeBandInt("bc_escref", in, Codec.UNSIGNED5, bcEscRefCount);
bcEscRefSize = decodeBandInt("bc_escrefsize", in, Codec.UNSIGNED5, bcEscRefCount);
bcEscSize = decodeBandInt("bc_escsize", in, Codec.UNSIGNED5, bcEscCount);
bcEscByte = decodeBandInt("bc_escbyte", in, Codec.BYTE1, bcEscSize);
}