Add hello world codegen example

codegen/examples/hello_world/Makefile.inc

@@ -0,0 +1,10 @@
+CODEGEN_HELLO_WORLD_SRCS := \
+$(TENSORFLOW_ROOT)codegen/examples/hello_world/hello_world.cc \
+$(TENSORFLOW_ROOT)codegen/examples/hello_world/hello_world_model.cc
+
+CODEGEN_HELLO_WORLD_HDRS := \
+$(TENSORFLOW_ROOT)codegen/examples/hello_world/hello_world_model.h
+
+# Builds a standalone binary.
+$(eval $(call microlite_test,codegen_hello_world,\
+$(CODEGEN_HELLO_WORLD_SRCS),,))

codegen/examples/hello_world/README.md

@@ -0,0 +1,18 @@
+# Codegen Hello World Example
+
+This is a code-generated example of the hello world model.
+
+To generate the inference code at `codegen/example/hello_world_model.h/.cc`:
+
+```
+bazel run codegen:code_generator -- \
+  --model $(pwd)/tensorflow/lite/micro/examples/hello_world/models/hello_world_int8.tflite \
+  --output_dir $(pwd)/codegen/examples/hello_world \
+  --output_name hello_world_model
+```
+
+To compile the generated source, you can use the Makefile:
+
+```
+make -f tensorflow/lite/micro/tools/make/Makefile codegen_hello_world
+```

codegen/examples/hello_world/hello_world.cc

@@ -0,0 +1,22 @@
+/* Copyright 2023 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.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+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.
+==============================================================================*/
+
+#include "hello_world_model.h"
+
+int main(int argc, char** argv) {
+  hello_world_model::Invoke();
+
+  return 0;
+}

codegen/examples/hello_world/hello_world_model.cc

@@ -0,0 +1,24 @@
+/* Copyright 2023 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.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+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.
+==============================================================================*/
+
+/* AUTOMATICALLY GENERATED DO NOT MODIFY */
+
+#include "hello_world_model.h"
+
+namespace hello_world_model {
+
+void Invoke() {}
+
+}  // namespace hello_world_model

codegen/examples/hello_world/hello_world_model.h

@@ -0,0 +1,24 @@
+/* Copyright 2023 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.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+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.
+==============================================================================*/
+
+/* AUTOMATICALLY GENERATED DO NOT MODIFY */
+
+#pragma once
+
+namespace hello_world_model {
+
+void Invoke();
+
+}  // namespace hello_world_model

codegen/templates/inference.cc.mako

@@ -21,4 +21,4 @@ namespace ${model_name} {
 
 void Invoke() {}
 
-} // ${model_name}
+}  // namespace ${model_name}

codegen/templates/inference.h.mako

@@ -21,4 +21,4 @@ namespace ${model_name} {
 
 void Invoke();
 
-} // ${model_name}
+}  // namespace ${model_name}

tensorflow/lite/micro/tools/make/Makefile

@@ -287,6 +287,8 @@ MICRO_LITE_BENCHMARKS := $(wildcard $(TENSORFLOW_ROOT)tensorflow/lite/micro/tool
 MICROLITE_BENCHMARK_SRCS := \
 $(wildcard $(TENSORFLOW_ROOT)tensorflow/lite/micro/tools/benchmarking/*benchmark.cc)
 
+MICRO_LITE_CODEGEN_EXAMPLES := $(shell find $(TENSORFLOW_ROOT)codegen/examples/ -name Makefile.inc)
+
 MICROLITE_TEST_SRCS := \
 $(TENSORFLOW_ROOT)tensorflow/lite/micro/fake_micro_context_test.cc \
 $(TENSORFLOW_ROOT)tensorflow/lite/micro/flatbuffer_utils_test.cc \
@@ -676,6 +678,9 @@ INCLUDES += -I$(GENERATED_SRCS_DIR)$(TENSORFLOW_ROOT)
 # Load the examples.
 include $(MICRO_LITE_EXAMPLE_TESTS)
 
+# Load codegen examples.
+include $(MICRO_LITE_CODEGEN_EXAMPLES)
+
 # Load the integration tests.
 include $(MICRO_LITE_INTEGRATION_TESTS)