Sync from tflite-micro at a8c2ebf.

Signed-off-by: CFU-Playground-Bot <[email protected]>

conf/tflite-micro.version

@@ -1 +1 @@
-8746ec9
+a8c2ebf

third_party/tflite-micro/tensorflow/lite/c/builtin_op_data.h

@@ -1,4 +1,4 @@
-/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -15,8 +15,6 @@ limitations under the License.
 #ifndef TENSORFLOW_LITE_C_BUILTIN_OP_DATA_H_
 #define TENSORFLOW_LITE_C_BUILTIN_OP_DATA_H_
 
-/// For documentation, see
-/// third_party/tensorflow/lite/core/c/builtin_op_data.h.
-#include "tensorflow/lite/core/c/builtin_op_data.h"  // IWYU pragma: export
+#include "tensorflow/lite/core/c/builtin_op_data.h"
 
 #endif  // TENSORFLOW_LITE_C_BUILTIN_OP_DATA_H_

third_party/tflite-micro/tensorflow/lite/c/c_api_types.h

@@ -1,4 +1,4 @@
-/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+/* Copyright 2022 The TensorFlow Authors. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -12,15 +12,9 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
-
-// This file declares types used by the pure C inference API defined in c_api.h,
-// some of which are also used in the C++ and C kernel and interpreter APIs.
-
 #ifndef TENSORFLOW_LITE_C_C_API_TYPES_H_
 #define TENSORFLOW_LITE_C_C_API_TYPES_H_
 
-/// For documentation, see
-/// third_party/tensorflow/lite/core/c/c_api_types.h.
-#include "tensorflow/lite/core/c/c_api_types.h"  // IWYU pragma: export
+#include "tensorflow/lite/core/c/c_api_types.h"
 
 #endif  // TENSORFLOW_LITE_C_C_API_TYPES_H_

third_party/tflite-micro/tensorflow/lite/c/common.h

@@ -36,8 +36,12 @@ limitations under the License.
 #ifndef TENSORFLOW_LITE_C_COMMON_H_
 #define TENSORFLOW_LITE_C_COMMON_H_
 
-/// For documentation, see
-/// third_party/tensorflow/lite/core/c/common.h.
-#include "tensorflow/lite/core/c/common.h"  // IWYU pragma: export
+#include "tensorflow/lite/core/c/common.h"
+
+// TfLiteOpaqueDelegate: allows delegation of nodes to alternative backends.
+// TfLiteOpaqueDelegate is an abstract type that is intended to have the same
+// role as TfLiteDelegate, but without necessarily exposing the implementation
+// details of how delegates are implemented.
+typedef TfLiteDelegate TfLiteOpaqueDelegate;
 
 #endif  // TENSORFLOW_LITE_C_COMMON_H_

third_party/tflite-micro/tensorflow/lite/core/c/common.cc

@@ -219,11 +219,11 @@ TfLiteStatus TfLiteTensorCopy(const TfLiteTensor* src, TfLiteTensor* dst) {
   return kTfLiteOk;
 }
 
-void TfLiteTensorResizeMaybeCopy(size_t num_bytes, TfLiteTensor* tensor,
-                                 bool preserve_data) {
+TfLiteStatus TfLiteTensorResizeMaybeCopy(size_t num_bytes, TfLiteTensor* tensor,
+                                         bool preserve_data) {
   if (tensor->allocation_type != kTfLiteDynamic &&
       tensor->allocation_type != kTfLitePersistentRo) {
-    return;
+    return kTfLiteOk;
   }
 #ifdef TF_LITE_TENSORFLOW_PROFILER
   tflite::PauseHeapMonitoring(/*pause=*/true);
@@ -258,9 +258,15 @@ void TfLiteTensorResizeMaybeCopy(size_t num_bytes, TfLiteTensor* tensor,
   tflite::PauseHeapMonitoring(/*pause=*/false);
 #endif
   tensor->bytes = num_bytes;
+  if (tensor->data.data == nullptr && num_bytes != 0) {
+    // We are done allocating but tensor is pointing to null and a valid size
+    // was requested, so we error.
+    return kTfLiteError;
+  }
+  return kTfLiteOk;
 }
 
-void TfLiteTensorRealloc(size_t num_bytes, TfLiteTensor* tensor) {
+TfLiteStatus TfLiteTensorRealloc(size_t num_bytes, TfLiteTensor* tensor) {
   return TfLiteTensorResizeMaybeCopy(num_bytes, tensor, true);
 }
 #endif  // TF_LITE_STATIC_MEMORY
@@ -331,4 +337,18 @@ void TfLiteOpaqueDelegateDelete(TfLiteOpaqueDelegate* opaque_delegate) {
   delete tflite_delegate;
 }
 
+void* TfLiteOpaqueDelegateGetData(const TfLiteOpaqueDelegate* delegate) {
+  if (!delegate) return nullptr;
+
+  // The following cast is safe only because this code is part of the
+  // TF Lite runtime implementation.  Apps using TF Lite should not rely on
+  // 'TfLiteOpaqueDelegate' and 'TfLiteDelegate' being equivalent.
+  const auto* tflite_delegate =
+      reinterpret_cast<const TfLiteDelegate*>(delegate);
+
+  if (!tflite_delegate->opaque_delegate_builder) return tflite_delegate->data_;
+
+  return tflite_delegate->opaque_delegate_builder->data;
+}
+
 }  // extern "C"

third_party/tflite-micro/tensorflow/lite/core/c/common.h

@@ -42,6 +42,7 @@ limitations under the License.
 #ifndef TENSORFLOW_LITE_CORE_C_COMMON_H_
 #define TENSORFLOW_LITE_CORE_C_COMMON_H_
 
+#include <stdarg.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
@@ -648,23 +649,26 @@ void TfLiteTensorReset(TfLiteType type, const char* name, TfLiteIntArray* dims,
 TfLiteStatus TfLiteTensorCopy(const TfLiteTensor* src, TfLiteTensor* dst);
 
 // Change the size of the memory block owned by `tensor` to `num_bytes`.
-// Tensors with allocation types other than kTfLiteDynamic will be ignored.
+// Tensors with allocation types other than `kTfLiteDynamic` will be ignored and
+// a kTfLiteOk will be returned.
 // `tensor`'s internal data buffer will be assigned a pointer
 // which can safely be passed to free or realloc if `num_bytes` is zero.
-// Behaviour is undefined if `tensor` is NULL.
 // If `preserve_data` is true, tensor data will be unchanged in the range from
-// the start of the region up to the minimum of the old and new sizes.
-void TfLiteTensorResizeMaybeCopy(size_t num_bytes, TfLiteTensor* tensor,
-                                 bool preserve_data);
+// the start of the region up to the minimum of the old and new sizes. In the
+// case of NULL tensor, or an error allocating new memory, returns
+// `kTfLiteError`.
+TfLiteStatus TfLiteTensorResizeMaybeCopy(size_t num_bytes, TfLiteTensor* tensor,
+                                         bool preserve_data);
 
 // Change the size of the memory block owned by `tensor` to `num_bytes`.
-// Tensors with allocation types other than kTfLiteDynamic will be ignored.
+// Tensors with allocation types other than kTfLiteDynamic will be ignored and
+// a kTfLiteOk will be returned.
 // `tensor`'s internal data buffer will be assigned a pointer
 // which can safely be passed to free or realloc if `num_bytes` is zero.
-// Behaviour is undefined if `tensor` is NULL.
 // Tensor data will be unchanged in the range from the start of the region up to
-// the minimum of the old and new sizes.
-void TfLiteTensorRealloc(size_t num_bytes, TfLiteTensor* tensor);
+// the minimum of the old and new sizes. In the case
+// of NULL tensor, or an error allocating new memory, returns `kTfLiteError`.
+TfLiteStatus TfLiteTensorRealloc(size_t num_bytes, TfLiteTensor* tensor);
 #endif  // TF_LITE_STATIC_MEMORY
 
 // WARNING: This is an experimental interface that is subject to change.
@@ -1135,6 +1139,20 @@ TfLiteOpaqueDelegate* TfLiteOpaqueDelegateCreate(
 // 'delegate' is a null pointer.
 void TfLiteOpaqueDelegateDelete(TfLiteOpaqueDelegate* delegate);
 
+// Returns a pointer to the data associated with the provided opaque 'delegate'.
+//
+// A null pointer will be returned when:
+// - The 'delegate' is null.
+// - The 'data' field of the 'TfLiteOpaqueDelegateBuilder' used to construct the
+//   'delegate' was null.
+// - Or in case of any other error.
+// - The 'delegate' has been constructed via a 'TfLiteOpaqueDelegateBuilder',
+//   but the 'data' field of the 'TfLiteOpaqueDelegateBuilder' is null.
+//
+//  The data_ field of 'delegate' will be returned if the
+//  'opaque_delegate_builder' field is null.
+void* TfLiteOpaqueDelegateGetData(const TfLiteOpaqueDelegate* delegate);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif  // __cplusplus