[REFACTOR] Cleanup legacy relay runtime data structures (#17713)

This PR cleans up legacy relay runtime data structures
ADT and closure as they can be superseded by Array and
VMClosure in the relax VM.

Author: tqchen

include/tvm/runtime/container/adt.h

@@ -77,8 +77,6 @@ struct TypeIndex {
     /*! \brief runtime::RPCObjectRef */
     kRuntimeRPCObjectRef = 9,
     // static assignments that may subject to change.
-    kRuntimeClosure,
-    kRuntimeADT,
     kStaticIndexEnd,
     /*! \brief Type index is allocated during runtime. */
     kDynamic = kStaticIndexEnd

include/tvm/runtime/container/closure.h

@@ -23,7 +23,6 @@
 #ifndef TVM_RUNTIME_RELAX_VM_EXECUTABLE_H_
 #define TVM_RUNTIME_RELAX_VM_EXECUTABLE_H_
 
-#include <tvm/runtime/container/closure.h>
 #include <tvm/runtime/object.h>
 #include <tvm/runtime/packed_func.h>
 #include <tvm/runtime/registry.h>

include/tvm/runtime/object.h

@@ -60,7 +60,7 @@ enum class VMInstrumentReturnKind : int {
 /*!
  * \brief An object representing a vm closure.
  */
-class VMClosureObj : public ClosureObj {
+class VMClosureObj : public Object {
  public:
   /*!
    * \brief The function name. The function could be any
@@ -78,14 +78,14 @@ class VMClosureObj : public ClosureObj {
 
   static constexpr const uint32_t _type_index = TypeIndex::kDynamic;
   static constexpr const char* _type_key = "relax.vm.Closure";
-  TVM_DECLARE_FINAL_OBJECT_INFO(VMClosureObj, ClosureObj);
+  TVM_DECLARE_FINAL_OBJECT_INFO(VMClosureObj, Object);
 };
 
 /*! \brief reference to closure. */
-class VMClosure : public Closure {
+class VMClosure : public ObjectRef {
  public:
   VMClosure(String func_name, PackedFunc impl);
-  TVM_DEFINE_OBJECT_REF_METHODS(VMClosure, Closure, VMClosureObj);
+  TVM_DEFINE_OBJECT_REF_METHODS(VMClosure, ObjectRef, VMClosureObj);
 
   /*!
    * \brief Create another PackedFunc with last arguments already bound to last_args.

include/tvm/runtime/relax_vm/executable.h

@@ -416,16 +416,6 @@ def render_object(val: tvm.Object) -> str:
     """
     if isinstance(val, tvm.nd.NDArray):
         return str(val)
-    # no pretty-printer by default, so if we don't handle this,
-    # then we can't look inside tuples
-    if isinstance(val, tvm.runtime.container.ADT):
-        # the fields array of an ADT cannot be directly accessed in Python
-        # so we have to get the length and index into the fields separately
-        fields = ", ".join([render_object(val[i]) for i in range(len(val))])
-        # special case: tag = 0 is a tuple
-        if val.tag == 0:
-            return f"({fields})"
-        return f"ADT(tag={val.tag}, fields=[{fields}])"
     if isinstance(val, tvm.ir.Array):
         fields = ", ".join([render_object(val[i]) for i in range(len(val))])
         return f"({fields})"

include/tvm/runtime/relax_vm/vm.h

@@ -17,7 +17,6 @@
 """Runtime container structures."""
 import tvm._ffi
 from .object import Object, PyNativeObject
-from .object_generic import ObjectTypes
 from . import _ffi_api
 
 
@@ -60,58 +59,6 @@ def getitem_helper(obj, elem_getter, length, idx):
     return elem_getter(obj, idx)
 
 
-@tvm._ffi.register_object("runtime.ADT")
-class ADT(Object):
-    """Algebatic data type(ADT) object.
-
-    Parameters
-    ----------
-    tag : int
-        The tag of ADT.
-
-    fields : list[Object] or tuple[Object]
-        The source tuple.
-    """
-
-    def __init__(self, tag, fields):
-        for f in fields:
-            assert isinstance(
-                f, ObjectTypes
-            ), f"Expect object or tvm NDArray type, but received : {type(f)}"
-        self.__init_handle_by_constructor__(_ffi_api.ADT, tag, *fields)
-
-    @property
-    def tag(self):
-        return _ffi_api.GetADTTag(self)
-
-    def __getitem__(self, idx):
-        return getitem_helper(self, _ffi_api.GetADTFields, len(self), idx)
-
-    def __len__(self):
-        return _ffi_api.GetADTSize(self)
-
-
-def tuple_object(fields=None):
-    """Create a ADT object from source tuple.
-
-    Parameters
-    ----------
-    fields : list[Object] or tuple[Object]
-        The source tuple.
-
-    Returns
-    -------
-    ret : ADT
-        The created object.
-    """
-    fields = fields if fields else []
-    for f in fields:
-        assert isinstance(
-            f, ObjectTypes
-        ), f"Expect object or tvm NDArray type, but received : {type(f)}"
-    return _ffi_api.Tuple(*fields)
-
-
 @tvm._ffi.register_object("runtime.String")
 class String(str, PyNativeObject):
     """TVM runtime.String object, represented as a python str.