1function(tf_get_absolute_path path base final_path)
2  if (IS_ABSOLUTE ${path})
3    set(${final_path} ${path} PARENT_SCOPE)
4  else()
5    set(${final_path} ${base}/${path} PARENT_SCOPE)
6  endif()
7endfunction()
8
9function(tf_get_model model final_path)
10  string(FIND ${model} "http:" pos_http)
11  string(FIND ${model} "https:" pos_https)
12  if (${pos_http} EQUAL 0 OR ${pos_https} EQUAL 0)
13    message("Downloading model " ${model})
14    string(FIND ${model} "/" fname_start REVERSE)
15    math(EXPR fname_start "${fname_start}+1")
16    string(SUBSTRING ${model} ${fname_start}+1 -1 fname)
17    message("Model archive: " ${fname})
18    file(DOWNLOAD ${model} ${CMAKE_CURRENT_BINARY_DIR}/${fname})
19    file(ARCHIVE_EXTRACT INPUT
20      ${CMAKE_CURRENT_BINARY_DIR}/${fname}
21      DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/${fname}_model)
22    set(${final_path} ${CMAKE_CURRENT_BINARY_DIR}/${fname}_model/model PARENT_SCOPE)
23  else()
24    tf_get_absolute_path(${model} ${CMAKE_CURRENT_BINARY_DIR} model_path)
25    set(${final_path} ${model_path} PARENT_SCOPE)
26  endif()
27endfunction()
28
29# Generate a mock model for tests.
30function(generate_mock_model model generate_mock_model_py config)
31  tf_get_absolute_path(${model} ${CMAKE_CURRENT_BINARY_DIR} LLVM_ML_MODELS_ABSOLUTE)
32  tf_get_absolute_path(${generate_mock_model_py} ${CMAKE_CURRENT_SOURCE_DIR} GENERATE_INLINING_MODEL_ABSOLUTE)
33  tf_get_absolute_path(${config} ${CMAKE_CURRENT_SOURCE_DIR} LLVM_ML_MODEL_CONFIG_ABSOLUTE)
34  message(WARNING "Autogenerated mock models should not be used in production builds.")
35  execute_process(COMMAND python3
36    ${GENERATE_INLINING_MODEL_ABSOLUTE}
37    ${LLVM_ML_MODEL_CONFIG_ABSOLUTE}
38    ${LLVM_ML_MODELS_ABSOLUTE}-autogenerated
39    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
40  )
41endfunction()
42
43# Run the tensorflow compiler (saved_model_cli) on the saved model in the
44# ${model} directory, looking for the ${tag_set} tag set, and the SignatureDef
45# ${signature_def_key}.
46# Produce a pair of files called ${fname}.h and  ${fname}.o in the
47# ${CMAKE_CURRENT_BINARY_DIR}. The generated header will define a C++ class
48# called ${cpp_class} - which may be a namespace-qualified class name.
49function(tfcompile model tag_set signature_def_key fname cpp_class)
50  set(prefix ${CMAKE_CURRENT_BINARY_DIR}/${fname})
51  set(obj_file ${prefix}.o)
52  set(hdr_file ${prefix}.h)
53  string(TOUPPER ${fname} fname_allcaps)
54  set(override_header ${LLVM_OVERRIDE_MODEL_HEADER_${fname_allcaps}})
55  set(override_object ${LLVM_OVERRIDE_MODEL_OBJECT_${fname_allcaps}})
56  if (EXISTS "${override_header}" AND EXISTS "${override_object}")
57    configure_file(${override_header} ${hdr_file} COPYONLY)
58    configure_file(${override_object} ${obj_file} COPYONLY)
59    message("Using provided header "
60      ${hdr_file} " and object "   ${obj_file}
61      " files for model " ${model})
62  else()
63    tf_get_absolute_path(${model} ${CMAKE_CURRENT_BINARY_DIR} LLVM_ML_MODELS_ABSOLUTE)
64    message("Using model at " ${LLVM_ML_MODELS_ABSOLUTE})
65    add_custom_command(OUTPUT ${obj_file} ${hdr_file}
66      COMMAND ${TENSORFLOW_AOT_COMPILER} aot_compile_cpu
67            --multithreading false
68            --dir ${LLVM_ML_MODELS_ABSOLUTE}
69            --tag_set ${tag_set}
70            --signature_def_key ${signature_def_key}
71            --output_prefix ${prefix}
72            --cpp_class ${cpp_class}
73            --target_triple ${LLVM_HOST_TRIPLE}
74    )
75  endif()
76
77  # Aggregate the objects so that results of different tfcompile calls may be
78  # grouped into one target.
79  set(GENERATED_OBJS ${GENERATED_OBJS} ${obj_file} PARENT_SCOPE)
80  set_source_files_properties(${obj_file} PROPERTIES
81    GENERATED 1 EXTERNAL_OBJECT 1)
82
83  set(GENERATED_HEADERS ${GENERATED_HEADERS} ${hdr_file} PARENT_SCOPE)
84  set_source_files_properties(${hdr_file} PROPERTIES
85    GENERATED 1)
86
87endfunction()
88
89function(tf_find_and_compile model default_url default_path generation_config tag_set signature_def_key fname cpp_class)
90  if ("${model}" STREQUAL "download")
91    # Crash if the user wants to download a model but a URL is set to "TO_BE_UPDATED"
92    if ("${LLVM_INLINER_MODEL_CURRENT_URL}" STREQUAL "TO_BE_UPDATED")
93        message(FATAL_ERROR "LLVM_INLINER_MODEL_PATH was set to 'download' but there is no model url currently specified in cmake - likely, the model interface recently changed, and so there is not a released model available.")
94    endif()
95
96    set(model ${default_url})
97  endif()
98
99  if ("${model}" STREQUAL "autogenerate")
100    generate_mock_model(${default_path} models/generate_mock_model.py ${generation_config})
101    set(model ${default_path}-autogenerated)
102  endif()
103
104  tf_get_model(${model} LLVM_ML_MODELS_ABSOLUTE)
105  tfcompile(${LLVM_ML_MODELS_ABSOLUTE} ${tag_set} ${signature_def_key} ${fname} ${cpp_class})
106
107  set(GENERATED_OBJS ${GENERATED_OBJS} ${obj_file} PARENT_SCOPE)
108  set_source_files_properties(${obj_file} PROPERTIES
109    GENERATED 1 EXTERNAL_OBJECT 1)
110
111  set(GENERATED_HEADERS ${GENERATED_HEADERS} ${hdr_file} PARENT_SCOPE)
112  set_source_files_properties(${hdr_file} PROPERTIES
113    GENERATED 1)
114
115  set(GeneratedMLSources ${GeneratedMLSources} ${GENERATED_HEADERS} PARENT_SCOPE)
116  set(MLDeps ${MLDeps} tf_xla_runtime PARENT_SCOPE)
117  set(MLLinkDeps ${MLLinkDeps} tf_xla_runtime ${GENERATED_OBJS} PARENT_SCOPE)
118
119endfunction()
120