public void atCastExpr(CastExpr expr) throws CompileError {
String cname = resolveClassName(expr.getClassName());
String toClass = checkCastExpr(expr, cname);
int srcType = exprType;
exprType = expr.getType();
arrayDim = expr.getArrayDim();
className = cname;
if (toClass == null) atNumCastExpr(srcType, exprType); // built-in type
else bytecode.addCheckcast(toClass);
}
private String checkCastExpr(CastExpr expr, String name) throws CompileError {
final String msg = "invalid cast";
ASTree oprand = expr.getOprand();
int dim = expr.getArrayDim();
int type = expr.getType();
oprand.accept(this);
int srcType = exprType;
if (invalidDim(srcType, arrayDim, className, type, dim, name, true)
|| srcType == VOID
|| type == VOID) throw new CompileError(msg);
if (type == CLASS) {
if (!isRefType(srcType)) throw new CompileError(msg);
return toJvmArrayName(name, dim);
} else if (dim > 0) return toJvmTypeName(type, dim);
else return null; // built-in type
}