Use NDM in backend init context

runtime/backend/backend_init_context.h

@@ -8,6 +8,7 @@
 
 #pragma once
 #include <executorch/runtime/core/memory_allocator.h>
+#include <executorch/runtime/core/named_data_map.h>
 
 namespace executorch {
 namespace runtime {
@@ -21,8 +22,11 @@ class BackendInitContext final {
   explicit BackendInitContext(
       MemoryAllocator* runtime_allocator,
       EventTracer* event_tracer = nullptr,
-      const char* method_name = nullptr)
-      : runtime_allocator_(runtime_allocator), method_name_(method_name) {}
+      const char* method_name = nullptr,
+      const NamedDataMap* named_data_map = nullptr)
+      : runtime_allocator_(runtime_allocator),
+        method_name_(method_name),
+        named_data_map_(named_data_map) {}
 
   /** Get the runtime allocator passed from Method. It's the same runtime
    * executor used by the standard executor runtime and the life span is the
@@ -52,10 +56,18 @@ class BackendInitContext final {
     return method_name_;
   }
 
+  /** Get the named data map from ExecuTorch runtime.
+   * This provides a way for backends to retrieve data blobs by key.
+   */
+  const NamedDataMap* get_named_data_map() const {
+    return named_data_map_;
+  }
+
  private:
   MemoryAllocator* runtime_allocator_ = nullptr;
   EventTracer* event_tracer_ = nullptr;
   const char* method_name_ = nullptr;
+  const NamedDataMap* named_data_map_ = nullptr;
 };
 
 } // namespace runtime

runtime/backend/interface.h

@@ -17,6 +17,7 @@
 #include <executorch/runtime/core/evalue.h>
 #include <executorch/runtime/core/freeable_buffer.h>
 #include <executorch/runtime/core/memory_allocator.h>
+#include <executorch/runtime/core/named_data_map.h>
 #include <executorch/runtime/core/result.h>
 #include <executorch/runtime/platform/compiler.h>
 

runtime/backend/targets.bzl

@@ -29,5 +29,6 @@ def define_common_targets():
                 "//executorch/runtime/core:evalue" + aten_suffix,
                 "//executorch/runtime/core:event_tracer" + aten_suffix,
                 "//executorch/runtime/core:memory_allocator",
+                "//executorch/runtime/core:named_data_map",
             ],
         )

runtime/executor/method.cpp

@@ -798,6 +798,14 @@ Error Method::init(
       return Error::MemoryAllocationFailed;
     }
 
+    // Get NamedDataMap, if it exists.
+    const NamedDataMap* pte_data_map = nullptr;
+    Result<const NamedDataMap*> pte_data_map_res =
+        program_->get_named_data_map();
+    if (pte_data_map_res.ok()) {
+      pte_data_map = pte_data_map_res.get();
+    }
+
     // n_delegate_ counts the number of successfully-initialized delegates for
     // ~Method() to clean up, and is incremented at the bottom of the loop. This
     // makes it safe for errors to return without updating any state.
@@ -808,7 +816,8 @@ Error Method::init(
       BackendInitContext backend_init_context(
           method_allocator,
           /*event_tracer=*/event_tracer_,
-          /*method_name=*/serialization_plan_->name()->c_str());
+          /*method_name=*/serialization_plan_->name()->c_str(),
+          /*named_data_map=*/pte_data_map);
       Error err = BackendDelegate::Init(
           delegate, program_, backend_init_context, &delegates_[i]);
       if (err != Error::Ok) {