// Factory methods:
static DirectMethodHandle make(byte refKind, Class<?> receiver, MemberName member) {
MethodType mtype = member.getMethodOrFieldType();
if (!member.isStatic()) {
if (!member.getDeclaringClass().isAssignableFrom(receiver) || member.isConstructor())
throw new InternalError(member.toString());
mtype = mtype.insertParameterTypes(0, receiver);
}
if (!member.isField()) {
if (refKind == REF_invokeSpecial) {
member = member.asSpecial();
LambdaForm lform = preparedLambdaForm(member);
return new Special(mtype, lform, member);
} else {
LambdaForm lform = preparedLambdaForm(member);
return new DirectMethodHandle(mtype, lform, member);
}
} else {
LambdaForm lform = preparedFieldLambdaForm(member);
if (member.isStatic()) {
long offset = MethodHandleNatives.staticFieldOffset(member);
Object base = MethodHandleNatives.staticFieldBase(member);
return new StaticAccessor(mtype, lform, member, base, offset);
} else {
long offset = MethodHandleNatives.objectFieldOffset(member);
assert (offset == (int) offset);
return new Accessor(mtype, lform, member, (int) offset);
}
}
}
boolean resolveInPlace(MemberName m, boolean searchSupers, Class<?> lookupClass) {
if (m.name == null || m.type == null) { // find unique non-overloaded name
Class<?> defc = m.getDeclaringClass();
List<MemberName> choices = null;
if (m.isMethod())
choices = getMethods(defc, searchSupers, m.name, (MethodType) m.type, lookupClass);
else if (m.isConstructor()) choices = getConstructors(defc, lookupClass);
else if (m.isField())
choices = getFields(defc, searchSupers, m.name, (Class<?>) m.type, lookupClass);
// System.out.println("resolving "+m+" to "+choices);
if (choices == null || choices.size() != 1) return false;
if (m.name == null) m.name = choices.get(0).name;
if (m.type == null) m.type = choices.get(0).type;
}
MethodHandleNatives.resolve(m, lookupClass);
if (m.isResolved()) return true;
int matchFlags = m.flags | (searchSupers ? SEARCH_ALL_SUPERS : 0);
String matchSig = m.getSignature();
MemberName[] buf = {m};
int n =
MethodHandleNatives.getMembers(
m.getDeclaringClass(), m.getName(), matchSig, matchFlags, lookupClass, 0, buf);
if (n != 1) return false;
return m.isResolved();
}
/**
* Create a name for the given reflected method. The resulting name will be in a resolved state.
*/
public MemberName(Method m) {
Object[] typeInfo = {m.getReturnType(), m.getParameterTypes()};
init(m.getDeclaringClass(), m.getName(), typeInfo, flagsMods(IS_METHOD, m.getModifiers()));
// fill in vmtarget, vmindex while we have m in hand:
MethodHandleNatives.init(this, m);
assert (isResolved());
}
/**
* Create a name for the given reflected field. The resulting name will be in a resolved state.
*/
public MemberName(Field fld) {
init(
fld.getDeclaringClass(),
fld.getName(),
fld.getType(),
flagsMods(IS_FIELD, fld.getModifiers()));
// fill in vmtarget, vmindex while we have fld in hand:
MethodHandleNatives.init(this, fld);
assert (isResolved());
}
/**
* Create a name for the given reflected constructor. The resulting name will be in a resolved
* state.
*/
public MemberName(Constructor ctor) {
Object[] typeInfo = {void.class, ctor.getParameterTypes()};
init(
ctor.getDeclaringClass(),
CONSTRUCTOR_NAME,
typeInfo,
flagsMods(IS_CONSTRUCTOR, ctor.getModifiers()));
// fill in vmtarget, vmindex while we have ctor in hand:
MethodHandleNatives.init(this, ctor);
assert (isResolved());
}
/// Queries
List<MemberName> getMembers(
Class<?> defc, String matchName, Object matchType, int matchFlags, Class<?> lookupClass) {
matchFlags &= ALLOWED_FLAGS;
String matchSig = null;
if (matchType != null) {
matchSig = BytecodeDescriptor.unparse(matchType);
if (matchSig.startsWith("(")) matchFlags &= ~(ALL_KINDS & ~IS_INVOCABLE);
else matchFlags &= ~(ALL_KINDS & ~IS_FIELD);
}
final int BUF_MAX = 0x2000;
int len1 = matchName == null ? 10 : matchType == null ? 4 : 1;
MemberName[] buf = newMemberBuffer(len1);
int totalCount = 0;
ArrayList<MemberName[]> bufs = null;
int bufCount = 0;
for (; ; ) {
bufCount =
MethodHandleNatives.getMembers(
defc, matchName, matchSig, matchFlags, lookupClass, totalCount, buf);
if (bufCount <= buf.length) {
if (bufCount < 0) bufCount = 0;
totalCount += bufCount;
break;
}
// JVM returned to us with an intentional overflow!
totalCount += buf.length;
int excess = bufCount - buf.length;
if (bufs == null) bufs = new ArrayList<MemberName[]>(1);
bufs.add(buf);
int len2 = buf.length;
len2 = Math.max(len2, excess);
len2 = Math.max(len2, totalCount / 4);
buf = newMemberBuffer(Math.min(BUF_MAX, len2));
}
ArrayList<MemberName> result = new ArrayList<MemberName>(totalCount);
if (bufs != null) {
for (MemberName[] buf0 : bufs) {
Collections.addAll(result, buf0);
}
}
result.addAll(Arrays.asList(buf).subList(0, bufCount));
// Signature matching is not the same as type matching, since
// one signature might correspond to several types.
// So if matchType is a Class or MethodType, refilter the results.
if (matchType != null && matchType != matchSig) {
for (Iterator<MemberName> it = result.iterator(); it.hasNext(); ) {
MemberName m = it.next();
if (!matchType.equals(m.getType())) it.remove();
}
}
return result;
}
private void expandFromVM() {
if (!isResolved()) return;
if (type instanceof Object[]) type = null; // don't saddle JVM w/ typeInfo
MethodHandleNatives.expand(this);
}
