sandboxed-api/cmake/SapiBuildDefs.cmake

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# Copyright 2019 Google LLC
#
# 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.
# Embeds arbitrary binary data into a static library.
#
# NAME specifies the name for this target.
# NAMESPACE is the C++ namespace the generated code is placed in. Can be empty.
# SOURCES is a list of files that should be embedded. If a source names a
# target the target binary is embedded instead.
macro(sapi_cc_embed_data)
cmake_parse_arguments(_sapi_embed "" "NAME;NAMESPACE" "SOURCES" ${ARGN})
foreach(src IN LISTS _sapi_embed_SOURCES)
if(TARGET "${src}")
list(APPEND _sapi_embed_in "${CMAKE_CURRENT_BINARY_DIR}/${src}")
else()
list(APPEND _sapi_embed_in "${src}")
endif()
endforeach()
file(RELATIVE_PATH _sapi_embed_pkg
"${PROJECT_BINARY_DIR}"
"${CMAKE_CURRENT_BINARY_DIR}")
add_custom_command(
OUTPUT "${_sapi_embed_NAME}.h"
"${_sapi_embed_NAME}.cc"
WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
COMMAND filewrapper "${_sapi_embed_pkg}"
"${_sapi_embed_NAME}"
"${_sapi_embed_NAMESPACE}"
"${CMAKE_CURRENT_BINARY_DIR}/${_sapi_embed_NAME}.h"
"${CMAKE_CURRENT_BINARY_DIR}/${_sapi_embed_NAME}.cc"
${_sapi_embed_in}
DEPENDS ${_sapi_embed_SOURCES}
VERBATIM
)
add_library("${_sapi_embed_NAME}" STATIC
"${_sapi_embed_NAME}.h"
"${_sapi_embed_NAME}.cc"
)
target_link_libraries("${_sapi_embed_NAME}" PRIVATE
sapi::base
absl::core_headers
)
endmacro()
# Adds a library target implementing a sandboxed API for another library.
# The first argument is the target name, similar to the native add_library().
# This function implements the same functionality as the Bazel version in
# sandboxed_api/bazel/sapi.bzl.
#
# SOURCES Any additional sources to include with the Sandboxed API library.
# Typically not necessary, unless the sandbox definition should be in a .cc
# file instead of the customary "sandbox.h" header. Bazel also has a "hdrs"
# attribute, but CMake does not distinguish headers from sources.
# FUNCTIONS A list of functions that to use in from host code. Leaving this
# list empty will export and wrap all functions found in the library.
# NOEMBED Whether the SAPI library should be embedded inside host code, so the
# SAPI Sandbox can be initialized with the
# ::sapi::Sandbox::Sandbox(FileToc*) constructor.
# LIBRARY The library target to sandbox and expose to the host code (required).
# LIBRARY_NAME The name of the class which will proxy the library functions
# from the functions list (required). You will call functions from the
# sandboxed library via instances of this class.
# INPUTS List of source files which the SAPI interface generator should scan
# for function declarations. Library header files are always scanned, so
# this can usually be empty/omitted.
# NAMESPACE C++ namespace identifier to place API class defined by
# LIBRARY_NAME into.
# HEADER If set, does not generate an interface header, but uses the one
# specified.
function(add_sapi_library)
set(_sapi_opts NOEMBED)
set(_sapi_one_value HEADER LIBRARY LIBRARY_NAME NAMESPACE)
set(_sapi_multi_value SOURCES FUNCTIONS INPUTS)
cmake_parse_arguments(_sapi
"${_sapi_opts}"
"${_sapi_one_value}"
"${_sapi_multi_value}"
${ARGN})
set(_sapi_NAME "${ARGV0}")
set(_sapi_gen_header "${_sapi_NAME}.sapi.h")
foreach(func IN LISTS _sapi_FUNCTIONS)
list(APPEND _sapi_exported_funcs "-Wl,--export-dynamic-symbol,${func}")
endforeach()
if(NOT _sapi_exported_funcs)
set(_sapi_exported_funcs -Wl,--whole-archive
-Wl,--allow-multiple-definition)
endif()
# The sandboxed binary
set(_sapi_bin "${_sapi_NAME}.bin")
set(_sapi_force_cxx_linkage
"${CMAKE_CURRENT_BINARY_DIR}/${_sapi_bin}_force_cxx_linkage.cc")
file(WRITE "${_sapi_force_cxx_linkage}" "")
add_executable("${_sapi_bin}" "${_sapi_force_cxx_linkage}")
# TODO(cblichmann): Use target_link_options on CMake >= 3.13
target_link_libraries("${_sapi_bin}" PRIVATE
-fuse-ld=gold
"${_sapi_LIBRARY}"
sapi::client
${CMAKE_DL_LIBS}
-Wl,-E
${_sapi_exported_funcs}
)
if(NOT _sapi_NOEMBED)
set(_sapi_embed "${_sapi_NAME}_embed")
sapi_cc_embed_data(NAME "${_sapi_embed}"
NAMESPACE "${_sapi_NAMESPACE}"
SOURCES "${_sapi_bin}"
)
endif()
# Interface
list_join(_sapi_FUNCTIONS "," _sapi_funcs)
foreach(src IN LISTS _sapi_INPUTS)
get_filename_component(src "${src}" ABSOLUTE)
list(APPEND _sapi_full_inputs "${src}")
endforeach()
if(NOT _sapi_NOEMBED)
set(_sapi_embed_dir "${CMAKE_CURRENT_BINARY_DIR}")
set(_sapi_embed_name "${_sapi_NAME}")
endif()
if(SAPI_ENABLE_GENERATOR)
add_custom_command(
OUTPUT "${_sapi_gen_header}"
COMMAND sapi_generator_tool
"--sapi_name=${_sapi_LIBRARY_NAME}"
"--sapi_out=${_sapi_gen_header}"
"--sapi_embed_dir=${_sapi_embed_dir}"
"--sapi_embed_name=${_sapi_embed_name}"
"--sapi_functions=${_sapi_funcs}"
"--sapi_ns=${_sapi_NAMESPACE}"
${_sapi_full_inputs}
COMMENT "Generating interface"
DEPENDS ${_sapi_INPUTS}
VERBATIM
)
else()
set(_sapi_isystem "${_sapi_NAME}.isystem")
list_join(_sapi_full_inputs "," _sapi_full_inputs)
add_custom_command(
OUTPUT "${_sapi_gen_header}" "${_sapi_isystem}"
COMMAND sh -c
"${CMAKE_CXX_COMPILER} -E -x c++ -v /dev/null 2>&1 | \
awk '/> search starts here:/{f=1;next}/^End of search/{f=0}f{print $1}' \
> \"${_sapi_isystem}\""
COMMAND "${SAPI_PYTHON3_EXECUTABLE}" -B
"${SAPI_SOURCE_DIR}/sandboxed_api/tools/generator2/sapi_generator.py"
"--sapi_name=${_sapi_LIBRARY_NAME}"
"--sapi_out=${_sapi_gen_header}"
"--sapi_embed_dir=${_sapi_embed_dir}"
"--sapi_embed_name=${_sapi_embed_name}"
"--sapi_functions=${_sapi_funcs}"
"--sapi_ns=${_sapi_NAMESPACE}"
"--sapi_isystem=${_sapi_isystem}"
"--sapi_in=${_sapi_full_inputs}"
COMMENT "Generating interface"
VERBATIM
)
endif()
# Library with the interface
if(NOT _sapi_SOURCES)
set(_sapi_force_cxx_linkage
"${CMAKE_CURRENT_BINARY_DIR}/${_sapi_NAME}_force_cxx_linkage.cc")
file(WRITE "${_sapi_force_cxx_linkage}" "")
list(APPEND _sapi_SOURCES "${_sapi_force_cxx_linkage}")
endif()
add_library("${_sapi_NAME}" STATIC
"${_sapi_gen_header}"
${_sapi_SOURCES}
)
target_link_libraries("${_sapi_NAME}" PRIVATE
sapi::sapi
sapi::vars
)
if(NOT _sapi_NOEMBED)
target_link_libraries("${_sapi_NAME}" PRIVATE
"${_sapi_embed}"
)
endif()
endfunction()