[FFI] Phase out ObjectPath in favor of AccessPath (#18192)

This PR phases out ObjectPath in favor of AccessPath

Author: tqchen

ffi/include/tvm/ffi/container/tuple.h

@@ -269,9 +269,5 @@ inline constexpr bool type_contains_v<Tuple<T...>, Tuple<U...>> = (type_contains
 }  // namespace details
 
 }  // namespace ffi
-
-// Expose to the tvm namespace
-// Rationale: convinience and no ambiguity
-using ffi::Tuple;
 }  // namespace tvm
 #endif  // TVM_FFI_CONTAINER_TUPLE_H_

include/tvm/node/object_path.h

@@ -23,6 +23,7 @@
 #ifndef TVM_NODE_REPR_PRINTER_H_
 #define TVM_NODE_REPR_PRINTER_H_
 
+#include <tvm/ffi/reflection/access_path.h>
 #include <tvm/node/functor.h>
 #include <tvm/node/script_printer.h>
 
@@ -87,6 +88,51 @@ inline std::ostream& operator<<(std::ostream& os, const Variant<V...>& n) {  //
   return os;
 }
 
+namespace reflection {
+
+inline std::ostream& operator<<(std::ostream& os, const AccessStep& step) {
+  namespace refl = ffi::reflection;
+  switch (step->kind) {
+    case refl::AccessKind::kAttr: {
+      os << '.' << step->key.cast<String>();
+      return os;
+    }
+    case refl::AccessKind::kArrayItem: {
+      os << "[" << step->key.cast<int64_t>() << "]";
+      return os;
+    }
+    case refl::AccessKind::kMapItem: {
+      os << "[" << step->key << "]";
+      return os;
+    }
+    case refl::AccessKind::kAttrMissing: {
+      os << ".<missing attr " << step->key.cast<String>() << "`>";
+      return os;
+    }
+    case refl::AccessKind::kArrayItemMissing: {
+      os << "[<missing item at " << step->key.cast<int64_t>() << ">]";
+      return os;
+    }
+    case refl::AccessKind::kMapItemMissing: {
+      os << "[<missing item at " << step->key << ">]";
+      return os;
+    }
+    default: {
+      LOG(FATAL) << "Unknown access step kind: " << static_cast<int>(step->kind);
+    }
+  }
+  return os;
+}
+
+inline std::ostream& operator<<(std::ostream& os, const AccessPath& path) {
+  Array<AccessStep> steps = path->ToSteps();
+  os << "<root>";
+  for (const auto& step : steps) {
+    os << step;
+  }
+  return os;
+}
+}  // namespace reflection
 }  // namespace ffi
 }  // namespace tvm
 #endif  // TVM_NODE_REPR_PRINTER_H_

include/tvm/node/repr_printer.h

@@ -26,18 +26,18 @@
 #include <tvm/ffi/any.h>
 #include <tvm/ffi/container/array.h>
 #include <tvm/ffi/container/map.h>
+#include <tvm/ffi/reflection/access_path.h>
 #include <tvm/ffi/reflection/registry.h>
 #include <tvm/ffi/string.h>
 #include <tvm/node/functor.h>
-#include <tvm/node/object_path.h>
 #include <tvm/runtime/data_type.h>
 
 #include <iostream>
 #include <string>
 
 namespace tvm {
 
-class PrinterConfigNode : public Object {
+class PrinterConfigNode : public ffi::Object {
  public:
   /*! \brief A stack that tracks the names of the binding hierarchy */
   Array<String> binding_names = {};
@@ -113,9 +113,9 @@ class PrinterConfigNode : public Object {
   bool show_all_struct_info = true;
 
   /* \brief Object path to be underlined */
-  Array<ObjectPath> path_to_underline = Array<ObjectPath>();
+  Array<ffi::reflection::AccessPath> path_to_underline;
   /*! \brief Object path to be annotated. */
-  Map<ObjectPath, String> path_to_annotate = Map<ObjectPath, String>();
+  Map<ffi::reflection::AccessPath, String> path_to_annotate;
   /*! \brief Object to be underlined. */
   Array<ObjectRef> obj_to_underline = Array<ObjectRef>();
   /*! \brief Object to be annotated. */