/**
* Read the interfaces table
*
* @param data
* @param cls
* @param cp
* @return Some flags
*/
private static int readInterfaces(ByteBuffer data, VmType cls, VmCP cp) {
int flags = 0;
final int icount = data.getChar();
if (icount > 0) {
final VmImplementedInterface[] itable = new VmImplementedInterface[icount];
for (int i = 0; i < icount; i++) {
final VmConstClass icls = cp.getConstClass(data.getChar());
final String iclsName = icls.getClassName();
itable[i] = new VmImplementedInterface(iclsName);
for (PragmaInterface pi : INTERFACE_PRAGMAS) {
if (iclsName.equals(pi.className)) {
flags |= pi.flags;
}
}
}
cls.setInterfaceTable(itable);
}
return flags;
}
/**
* Decode the data of a Exceptions attribute
*
* @param data
* @param cls
* @param cp
* @return The read exceptions
*/
private static final VmExceptions readExceptions(ByteBuffer data, VmType cls, VmCP cp) {
// Read the exceptions
char pragmaFlags = 0;
int pragmas = 0;
final int ecount = data.getChar();
final VmConstClass[] list = new VmConstClass[ecount];
for (int i = 0; i < ecount; i++) {
final int idx = data.getChar();
final VmConstClass ccls = cp.getConstClass(idx);
list[i] = ccls;
for (MethodPragmaException mp : METHOD_PRAGMA_EXCEPTIONS) {
if (ccls.getClassName().equals(mp.className)) {
pragmaFlags |= mp.flags;
pragmas++;
list[i] = null;
break;
}
}
}
if (pragmas > 0) {
final int newCnt = ecount - pragmas;
if (newCnt == 0) {
return new VmExceptions(null, pragmaFlags);
} else {
final VmConstClass[] newList = new VmConstClass[newCnt];
int k = 0;
for (int i = 0; i < ecount; i++) {
final VmConstClass ccls = list[i];
if (ccls != null) {
newList[k++] = ccls;
}
}
return new VmExceptions(newList, pragmaFlags);
}
} else {
return new VmExceptions(list, pragmaFlags);
}
}
/**
* Decode a given class.
*
* @param data
* @param rejectNatives
* @param clc
* @param protectionDomain
* @return The decoded class
* @throws ClassFormatError
*/
private static final VmType decodeClass(
ByteBuffer data, boolean rejectNatives, VmClassLoader clc, ProtectionDomain protectionDomain)
throws ClassFormatError {
final VmSharedStatics sharedStatics = clc.getSharedStatics();
final VmIsolatedStatics isolatedStatics = clc.getIsolatedStatics();
final int slotSize = clc.getArchitecture().getReferenceSize();
final int magic = data.getInt();
if (magic != 0xCAFEBABE) {
throw new ClassFormatError("invalid magic");
}
final int min_version = data.getChar();
final int maj_version = data.getChar();
if (false) {
BootLogInstance.get().debug("Class file version " + maj_version + ';' + min_version);
}
final int cpcount = data.getChar();
// allocate enough space for the CP
final byte[] tags = new byte[cpcount];
final VmCP cp = new VmCP(cpcount);
for (int i = 1; i < cpcount; i++) {
final int tag = data.get() & 0xFF;
tags[i] = (byte) tag;
switch (tag) {
case 1:
// Utf8
cp.setUTF8(i, readUTF(data));
break;
case 3:
// int
cp.setInt(i, data.getInt());
break;
case 4:
// float
// cp.setInt(i, data.getInt());
final int ival = data.getInt();
final float fval = Float.intBitsToFloat(ival);
cp.setFloat(i, fval);
break;
case 5:
// long
cp.setLong(i, data.getLong());
i++;
break;
case 6:
// double
// cp.setLong(i, data.getLong());
final long lval = data.getLong();
final double dval = Double.longBitsToDouble(lval);
cp.setDouble(i, dval);
i++;
break;
case 7:
// class
cp.setInt(i, data.getChar());
break;
case 8:
// String
cp.setInt(i, data.getChar());
break;
case 9: // Fieldref
case 10: // Methodref
case 11: // IMethodref
{
final int clsIdx = data.getChar();
final int ntIdx = data.getChar();
cp.setInt(i, clsIdx << 16 | ntIdx);
break;
}
case 12:
// Name and Type
{
final int nIdx = data.getChar();
final int dIdx = data.getChar();
cp.setInt(i, nIdx << 16 | dIdx);
break;
}
default:
throw new ClassFormatError("Invalid constantpool tag: " + tags[i]);
}
}
// Now patch the required entries (level 1)
for (int i = 1; i < cpcount; i++) {
switch (tags[i]) {
case 7:
{
// Class
final int idx = cp.getInt(i);
final VmConstClass constClass = new VmConstClass(cp.getUTF8(idx));
cp.setConstClass(i, constClass);
break;
}
case 8:
{
// String
final int idx = cp.getInt(i);
final int staticsIdx = sharedStatics.allocConstantStringField(cp.getUTF8(idx));
final VmConstString constStr = new VmConstString(staticsIdx);
cp.setString(i, constStr);
break;
}
}
}
// Now patch the required entries (level 2)
for (int i = 1; i < cpcount; i++) {
final int tag = tags[i];
if ((tag >= 9) && (tag <= 11)) {
final int v = cp.getInt(i);
final VmConstClass constClass = cp.getConstClass(v >>> 16);
final int nat = cp.getInt(v & 0xFFFF);
final String name = cp.getUTF8(nat >>> 16);
final String descriptor = cp.getUTF8(nat & 0xFFFF);
switch (tag) {
case 9:
// FieldRef
cp.setConstFieldRef(i, new VmConstFieldRef(constClass, name, descriptor));
break;
case 10:
// MethodRef
cp.setConstMethodRef(i, new VmConstMethodRef(constClass, name, descriptor));
break;
case 11:
// IMethodRef
cp.setConstIMethodRef(i, new VmConstIMethodRef(constClass, name, descriptor));
break;
}
}
}
// Cleanup the unwantend entries
for (int i = 1; i < cpcount; i++) {
switch (tags[i]) {
case 12:
// Name and Type
cp.reset(i);
break;
}
}
final int classModifiers = data.getChar();
final VmConstClass this_class = cp.getConstClass(data.getChar());
final String clsName = this_class.getClassName();
final VmConstClass super_class = cp.getConstClass(data.getChar());
final String superClassName;
if (super_class != null) {
superClassName = super_class.getClassName();
} else {
superClassName = null;
}
// Allocate the class object
final VmType cls;
if (Modifier.isInterface(classModifiers)) {
cls = new VmInterfaceClass(clsName, superClassName, clc, classModifiers, protectionDomain);
} else {
cls = new VmNormalClass(clsName, superClassName, clc, classModifiers, protectionDomain);
}
cls.setCp(cp);
// Determine if we can safely align the fields
// int pragmaFlags = 0;
if (isBootType(cls)) {
cls.addPragmaFlags(TypePragmaFlags.NO_FIELD_ALIGNMENT);
}
cls.addPragmaFlags(getClassNamePragmaFlags(clsName));
// Interface table
cls.addPragmaFlags(readInterfaces(data, cls, cp));
// Field table
final FieldData[] fieldData = readFields(data, cp, slotSize, clc);
// Method Table
readMethods(data, rejectNatives, cls, cp, sharedStatics, clc);
// Read class attributes
final int acount = data.getChar();
VmAnnotation[] rVisAnn = null;
VmAnnotation[] rInvisAnn = null;
String sourceFile = null;
String signature = null;
for (int a = 0; a < acount; a++) {
final String attrName = cp.getUTF8(data.getChar());
final int length = data.getInt();
if (VmArray.equals(RuntimeVisibleAnnotationsAttrName, attrName)) {
byte[] buf = new byte[length];
data.slice().get(buf);
cls.setRawAnnotations(buf);
rVisAnn = readRuntimeAnnotations(data, cp, true, clc);
} else if (VmArray.equals(RuntimeInvisibleAnnotationsAttrName, attrName)) {
rInvisAnn = readRuntimeAnnotations(data, cp, false, clc);
} else if (VmArray.equals(SourceFileAttrName, attrName)) {
sourceFile = cp.getUTF8(data.getChar());
} else if (VmArray.equals(SignatureAttrName, attrName)) {
signature = cp.getUTF8(data.getChar());
} else {
skip(data, length);
}
}
cls.setRuntimeAnnotations(rVisAnn);
cls.setSourceFile(sourceFile);
cls.setSignature(signature);
if (rInvisAnn != null) {
cls.addPragmaFlags(getClassPragmaFlags(rInvisAnn, clsName));
}
if (rVisAnn != null) {
cls.addPragmaFlags(getClassPragmaFlags(rVisAnn, clsName));
}
// Create the fields
if (fieldData != null) {
createFields(cls, fieldData, sharedStatics, isolatedStatics, slotSize, cls.getPragmaFlags());
}
return cls;
}