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Add rust_cxx_bridge CMake function
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We need a better way to create cxxbridges - something that uses the recommended method of cxxbridge-cmd.

This function creates C++ bindings using the [cxx] crate.

Original function found here: https://github.com/corrosion-rs/corrosion/blob/master/cmake/Corrosion.cmake#L1390

Reviewed By: xavierd

Differential Revision: D51160627
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John Elliott authored and facebook-github-bot committed Nov 13, 2023
1 parent 8e4c6e5 commit c0be4fb
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200 changes: 200 additions & 0 deletions build/fbcode_builder/CMake/RustStaticLibrary.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -314,3 +314,203 @@ function(install_rust_static_library TARGET)
DESTINATION ${ARG_INSTALL_DIR}
)
endfunction()

# This function creates C++ bindings using the [cxx] crate.
#
# Original function found here: https://github.com/corrosion-rs/corrosion/blob/master/cmake/Corrosion.cmake#L1390
# Simplified for use as part of RustStaticLibrary module. License below.
#
# MIT License
#
# Copyright (c) 2018 Andrew Gaspar
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# The rules approximately do the following:
# - Check which version of `cxx` the Rust crate depends on.
# - Check if the exact same version of `cxxbridge-cmd` is installed
# - If not, create a rule to build the exact same version of `cxxbridge-cmd`.
# - Create rules to run `cxxbridge` and generate
# - The `rust/cxx.h` header
# - A header and source file for the specified CXX_BRIDGE_FILE.
# - The generated sources (and header include directories) are added to the
# `${TARGET}` CMake library target.
#
# ```cmake
# rust_cxx_bridge(<TARGET> <CXX_BRIDGE_FILE> [CRATE <CRATE_NAME>])
# ```
#
# Parameters:
# - TARGET:
# Name of the target name. The target that the bridge will be included with.
# - CXX_BRIDGE_FILE:
# Name of the file that include the cxxbridge (e.g., "src/ffi.rs").
# - CRATE_NAME:
# Name of the crate. This parameter is optional. If unspecified, it will
# fallback to `${TARGET}`.
#
function(rust_cxx_bridge TARGET CXX_BRIDGE_FILE)
fb_cmake_parse_args(ARG "" "CRATE" "" "${ARGN}")

if(DEFINED ARG_CRATE)
set(crate_name "${ARG_CRATE}")
else()
set(crate_name "${TARGET}")
endif()

if(USE_CARGO_VENDOR)
set(extra_cargo_env "CARGO_HOME=${RUST_CARGO_HOME}")
endif()

execute_process(
COMMAND
"${CMAKE_COMMAND}" -E env
${extra_cargo_env}
"${CARGO_COMMAND}" tree -i cxx --depth=0
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
RESULT_VARIABLE cxx_version_result
OUTPUT_VARIABLE cxx_version_output
)

if(NOT "${cxx_version_result}" EQUAL "0")
message(FATAL_ERROR "Crate ${crate_name} does not depend on cxx.")
endif()
if(cxx_version_output MATCHES "cxx v([0-9]+.[0-9]+.[0-9]+)")
set(cxx_required_version "${CMAKE_MATCH_1}")
else()
message(
FATAL_ERROR
"Failed to parse cxx version from cargo tree output: `cxx_version_output`")
endif()

# First check if a suitable version of cxxbridge is installed
find_program(INSTALLED_CXXBRIDGE cxxbridge PATHS "$ENV{HOME}/.cargo/bin/")
mark_as_advanced(INSTALLED_CXXBRIDGE)
if(INSTALLED_CXXBRIDGE)
execute_process(
COMMAND "${INSTALLED_CXXBRIDGE}" --version
OUTPUT_VARIABLE cxxbridge_version_output
)
if(cxxbridge_version_output MATCHES "cxxbridge ([0-9]+.[0-9]+.[0-9]+)")
set(cxxbridge_version "${CMAKE_MATCH_1}")
else()
set(cxxbridge_version "")
endif()
endif()

set(cxxbridge "")
if(cxxbridge_version)
if(cxxbridge_version VERSION_EQUAL cxx_required_version)
set(cxxbridge "${INSTALLED_CXXBRIDGE}")
if(NOT TARGET "cxxbridge_v${cxx_required_version}")
# Add an empty target.
add_custom_target("cxxbridge_v${cxx_required_version}")
endif()
endif()
endif()

# No suitable version of cxxbridge was installed,
# so use custom target to install correct version.
if(NOT cxxbridge)
if(NOT TARGET "cxxbridge_v${cxx_required_version}")
add_custom_command(
OUTPUT
"${CMAKE_BINARY_DIR}/cxxbridge_v${cxx_required_version}/bin/cxxbridge"
COMMAND
"${CMAKE_COMMAND}" -E make_directory
"${CMAKE_BINARY_DIR}/cxxbridge_v${cxx_required_version}"
COMMAND
"${CMAKE_COMMAND}" -E remove -f "${CMAKE_CURRENT_SOURCE_DIR}/Cargo.lock"
COMMAND
"${CMAKE_COMMAND}" -E env
${extra_cargo_env}
"${CARGO_COMMAND}" install cxxbridge-cmd
--version "${cxx_required_version}"
--root "${CMAKE_BINARY_DIR}/cxxbridge_v${cxx_required_version}"
--quiet
COMMAND
"${CMAKE_COMMAND}" -E remove -f "${CMAKE_CURRENT_SOURCE_DIR}/Cargo.lock"
COMMENT "Installing cxxbridge (version ${cxx_required_version})"
)
add_custom_target(
"cxxbridge_v${cxx_required_version}"
DEPENDS "${CMAKE_BINARY_DIR}/cxxbridge_v${cxx_required_version}/bin/cxxbridge"
)
endif()
set(
cxxbridge
"${CMAKE_BINARY_DIR}/cxxbridge_v${cxx_required_version}/bin/cxxbridge"
)
endif()

add_library(${crate_name} STATIC)
target_include_directories(
${crate_name}
PUBLIC
$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
$<INSTALL_INTERFACE:include>
)

file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/rust")
add_custom_command(
OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/rust/cxx.h"
COMMAND
"${cxxbridge}" --header --output "${CMAKE_CURRENT_BINARY_DIR}/rust/cxx.h"
DEPENDS "cxxbridge_v${cxx_required_version}"
COMMENT "Generating rust/cxx.h header"
)

get_filename_component(filename_component ${CXX_BRIDGE_FILE} NAME)
get_filename_component(directory_component ${CXX_BRIDGE_FILE} DIRECTORY)
set(directory "")
if(directory_component)
set(directory "${directory_component}")
endif()

set(cxx_header ${directory}/${filename_component}.h)
set(cxx_source ${directory}/${filename_component}.cc)
set(rust_source_path "${CMAKE_CURRENT_SOURCE_DIR}/${CXX_BRIDGE_FILE}")

file(
MAKE_DIRECTORY
"${CMAKE_CURRENT_BINARY_DIR}/${directory_component}"
)

add_custom_command(
OUTPUT
"${CMAKE_CURRENT_BINARY_DIR}/${cxx_header}"
"${CMAKE_CURRENT_BINARY_DIR}/${cxx_source}"
COMMAND
${cxxbridge} ${rust_source_path}
--header --output "${CMAKE_CURRENT_BINARY_DIR}/${cxx_header}"
COMMAND
${cxxbridge} ${rust_source_path}
--output "${CMAKE_CURRENT_BINARY_DIR}/${cxx_source}"
--include "${cxx_header}"
DEPENDS "cxxbridge_v${cxx_required_version}" "${rust_source_path}"
COMMENT "Generating cxx bindings for crate ${crate_name}"
)

target_sources(${crate_name}
PRIVATE
"${CMAKE_CURRENT_BINARY_DIR}/${cxx_header}"
"${CMAKE_CURRENT_BINARY_DIR}/rust/cxx.h"
"${CMAKE_CURRENT_BINARY_DIR}/${cxx_source}"
)
endfunction()

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