private Code readUnaryAssign(int opcode, boolean wideBase, boolean wideRest) throws IOException {
int target = readBase(wideBase);
int operand = readBase(wideBase);
int typeIdx = readRest(wideRest);
Type type = typePool[typeIdx];
switch (opcode) {
case Code.OPCODE_convert:
{
int i = readRest(wideRest);
Type t = typePool[i];
return Code.Convert(type, target, operand, t);
}
case Code.OPCODE_assign:
return Code.Assign(type, target, operand);
case Code.OPCODE_dereference:
{
if (!(type instanceof Type.Reference)) {
throw new RuntimeException("expected reference type");
}
return Code.Dereference((Type.Reference) type, target, operand);
}
case Code.OPCODE_fieldload:
{
if (!(type instanceof Type.EffectiveRecord)) {
throw new RuntimeException("expected record type");
}
int i = readRest(wideRest);
String field = stringPool[i];
return Code.FieldLoad((Type.EffectiveRecord) type, target, operand, field);
}
case Code.OPCODE_invert:
return Code.Invert(type, target, operand);
case Code.OPCODE_newobject:
{
if (!(type instanceof Type.Reference)) {
throw new RuntimeException("expected reference type");
}
return Code.NewObject((Type.Reference) type, target, operand);
}
case Code.OPCODE_lengthof:
{
if (!(type instanceof Type.EffectiveCollection)) {
throw new RuntimeException("expected collection type");
}
return Code.LengthOf((Type.EffectiveCollection) type, target, operand);
}
case Code.OPCODE_move:
return Code.Move(type, target, operand);
case Code.OPCODE_neg:
return Code.UnArithOp(type, target, operand, Code.UnArithKind.NEG);
case Code.OPCODE_numerator:
return Code.UnArithOp(type, target, operand, Code.UnArithKind.NUMERATOR);
case Code.OPCODE_denominator:
return Code.UnArithOp(type, target, operand, Code.UnArithKind.DENOMINATOR);
case Code.OPCODE_not:
{
if (!(type instanceof Type.Bool)) {
throw new RuntimeException("expected bool type");
}
return Code.Not(target, operand);
}
case Code.OPCODE_tupleload:
{
if (!(type instanceof Type.EffectiveTuple)) {
throw new RuntimeException("expected tuple type");
}
int index = readRest(wideRest);
return Code.TupleLoad((Type.Tuple) type, target, operand, index);
}
}
throw new RuntimeException("unknown opcode encountered (" + opcode + ")");
}
