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// Copyright 2020 The Android Open Source Project
//
// 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.
package rust
import (
"github.com/google/blueprint"
"strings"
"android/soong/android"
"android/soong/cc"
ccConfig "android/soong/cc/config"
)
var (
defaultBindgenFlags = []string{""}
// bindgen should specify its own Clang revision so updating Clang isn't potentially blocked on bindgen failures.
bindgenClangVersion = "clang-r383902c"
bindgenLibClangSoGit = "11git"
//TODO(b/160803703) Use a prebuilt bindgen instead of the built bindgen.
_ = pctx.SourcePathVariable("bindgenCmd", "out/host/${config.HostPrebuiltTag}/bin/bindgen")
_ = pctx.SourcePathVariable("bindgenClang",
"${ccConfig.ClangBase}/${config.HostPrebuiltTag}/"+bindgenClangVersion+"/bin/clang")
_ = pctx.SourcePathVariable("bindgenLibClang",
"${ccConfig.ClangBase}/${config.HostPrebuiltTag}/"+bindgenClangVersion+"/lib64/libclang.so."+bindgenLibClangSoGit)
//TODO(ivanlozano) Switch this to RuleBuilder
bindgen = pctx.AndroidStaticRule("bindgen",
blueprint.RuleParams{
Command: "CLANG_PATH=$bindgenClang LIBCLANG_PATH=$bindgenLibClang RUSTFMT=${config.RustBin}/rustfmt " +
"$bindgenCmd $flags $in -o $out -- $cflags",
CommandDeps: []string{"$bindgenCmd"},
},
"flags", "cflags")
)
func init() {
android.RegisterModuleType("rust_bindgen", RustBindgenFactory)
}
var _ SourceProvider = (*bindgenDecorator)(nil)
type BindgenProperties struct {
// The wrapper header file
Wrapper_src *string `android:"path,arch_variant"`
// list of bindgen-specific flags and options
Flags []string `android:"arch_variant"`
// list of clang flags required to correctly interpret the headers.
Cflags []string `android:"arch_variant"`
// list of directories relative to the Blueprints file that will
// be added to the include path using -I
Local_include_dirs []string `android:"arch_variant,variant_prepend"`
// list of static libraries that provide headers for this binding.
Static_libs []string `android:"arch_variant,variant_prepend"`
// list of shared libraries that provide headers for this binding.
Shared_libs []string `android:"arch_variant"`
//TODO(b/161141999) Add support for headers from cc_library_header modules.
}
type bindgenDecorator struct {
*baseSourceProvider
Properties BindgenProperties
}
func (b *bindgenDecorator) libraryExports(ctx android.ModuleContext) (android.Paths, []string) {
var libraryPaths android.Paths
var libraryFlags []string
for _, static_lib := range b.Properties.Static_libs {
if dep, ok := ctx.GetDirectDepWithTag(static_lib, cc.StaticDepTag).(*cc.Module); ok {
libraryPaths = append(libraryPaths, dep.ExportedIncludeDirs()...)
libraryFlags = append(libraryFlags, dep.ExportedFlags()...)
}
}
for _, shared_lib := range b.Properties.Shared_libs {
if dep, ok := ctx.GetDirectDepWithTag(shared_lib, cc.SharedDepTag).(*cc.Module); ok {
libraryPaths = append(libraryPaths, dep.ExportedIncludeDirs()...)
libraryFlags = append(libraryFlags, dep.ExportedFlags()...)
}
}
return libraryPaths, libraryFlags
}
func (b *bindgenDecorator) generateSource(ctx android.ModuleContext) android.Path {
ccToolchain := ccConfig.FindToolchain(ctx.Os(), ctx.Arch())
includes, exportedFlags := b.libraryExports(ctx)
var cflags []string
cflags = append(cflags, b.Properties.Cflags...)
cflags = append(cflags, "-target "+ccToolchain.ClangTriple())
cflags = append(cflags, strings.ReplaceAll(ccToolchain.ToolchainClangCflags(), "${config.", "${ccConfig."))
cflags = append(cflags, exportedFlags...)
for _, include := range includes {
cflags = append(cflags, "-I"+include.String())
}
for _, include := range b.Properties.Local_include_dirs {
cflags = append(cflags, "-I"+android.PathForModuleSrc(ctx, include).String())
}
bindgenFlags := defaultBindgenFlags
bindgenFlags = append(bindgenFlags, strings.Join(b.Properties.Flags, " "))
wrapperFile := android.OptionalPathForModuleSrc(ctx, b.Properties.Wrapper_src)
if !wrapperFile.Valid() {
ctx.PropertyErrorf("wrapper_src", "invalid path to wrapper source")
}
outputFile := android.PathForModuleOut(ctx, b.baseSourceProvider.getStem(ctx)+".rs")
ctx.Build(pctx, android.BuildParams{
Rule: bindgen,
Description: "bindgen " + wrapperFile.Path().Rel(),
Output: outputFile,
Input: wrapperFile.Path(),
Implicits: includes,
Args: map[string]string{
"flags": strings.Join(bindgenFlags, " "),
"cflags": strings.Join(cflags, " "),
},
})
b.baseSourceProvider.outputFile = outputFile
return outputFile
}
func (b *bindgenDecorator) sourceProviderProps() []interface{} {
return append(b.baseSourceProvider.sourceProviderProps(),
&b.Properties)
}
// rust_bindgen generates Rust FFI bindings to C libraries using bindgen given a wrapper header as the primary input.
// Bindgen has a number of flags to control the generated source, and additional flags can be passed to clang to ensure
// the header and generated source is appropriately handled.
func RustBindgenFactory() android.Module {
module, _ := NewRustBindgen(android.HostAndDeviceSupported)
return module.Init()
}
func NewRustBindgen(hod android.HostOrDeviceSupported) (*Module, *bindgenDecorator) {
module := newModule(hod, android.MultilibBoth)
bindgen := &bindgenDecorator{
baseSourceProvider: NewSourceProvider(),
Properties: BindgenProperties{},
}
module.sourceProvider = bindgen
return module, bindgen
}
func (b *bindgenDecorator) sourceProviderDeps(ctx DepsContext, deps Deps) Deps {
deps = b.baseSourceProvider.sourceProviderDeps(ctx, deps)
deps.SharedLibs = append(deps.SharedLibs, b.Properties.Shared_libs...)
deps.StaticLibs = append(deps.StaticLibs, b.Properties.Static_libs...)
return deps
}
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