use of com.taobao.android.dx.cf.attrib.AttCode in project atlas by alibaba.
the class StdAttributeFactory method code.
/**
* Parses a {@code Code} attribute.
*/
private Attribute code(DirectClassFile cf, int offset, int length, ParseObserver observer) {
if (length < 12) {
return throwSeverelyTruncated();
}
ByteArray bytes = cf.getBytes();
ConstantPool pool = cf.getConstantPool();
// u2 max_stack
int maxStack = bytes.getUnsignedShort(offset);
// u2 max_locals
int maxLocals = bytes.getUnsignedShort(offset + 2);
// u4 code_length
int codeLength = bytes.getInt(offset + 4);
int origOffset = offset;
if (observer != null) {
observer.parsed(bytes, offset, 2, "max_stack: " + Hex.u2(maxStack));
observer.parsed(bytes, offset + 2, 2, "max_locals: " + Hex.u2(maxLocals));
observer.parsed(bytes, offset + 4, 4, "code_length: " + Hex.u4(codeLength));
}
offset += 8;
length -= 8;
if (length < (codeLength + 4)) {
return throwTruncated();
}
int codeOffset = offset;
offset += codeLength;
length -= codeLength;
BytecodeArray code = new BytecodeArray(bytes.slice(codeOffset, codeOffset + codeLength), pool);
if (observer != null) {
code.forEach(new CodeObserver(code.getBytes(), observer));
}
// u2 exception_table_length
int exceptionTableLength = bytes.getUnsignedShort(offset);
ByteCatchList catches = (exceptionTableLength == 0) ? ByteCatchList.EMPTY : new ByteCatchList(exceptionTableLength);
if (observer != null) {
observer.parsed(bytes, offset, 2, "exception_table_length: " + Hex.u2(exceptionTableLength));
}
offset += 2;
length -= 2;
if (length < (exceptionTableLength * 8 + 2)) {
return throwTruncated();
}
for (int i = 0; i < exceptionTableLength; i++) {
if (observer != null) {
observer.changeIndent(1);
}
int startPc = bytes.getUnsignedShort(offset);
int endPc = bytes.getUnsignedShort(offset + 2);
int handlerPc = bytes.getUnsignedShort(offset + 4);
int catchTypeIdx = bytes.getUnsignedShort(offset + 6);
CstType catchType = (CstType) pool.get0Ok(catchTypeIdx);
catches.set(i, startPc, endPc, handlerPc, catchType);
if (observer != null) {
observer.parsed(bytes, offset, 8, Hex.u2(startPc) + ".." + Hex.u2(endPc) + " -> " + Hex.u2(handlerPc) + " " + ((catchType == null) ? "<any>" : catchType.toHuman()));
}
offset += 8;
length -= 8;
if (observer != null) {
observer.changeIndent(-1);
}
}
catches.setImmutable();
AttributeListParser parser = new AttributeListParser(cf, CTX_CODE, offset, this);
parser.setObserver(observer);
StdAttributeList attributes = parser.getList();
attributes.setImmutable();
int attributeByteCount = parser.getEndOffset() - offset;
if (attributeByteCount != length) {
return throwBadLength(attributeByteCount + (offset - origOffset));
}
return new AttCode(maxStack, maxLocals, code, catches, attributes);
}
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