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// Copyright 2020 Google Inc. 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.
package rust
import (
"encoding/json"
"fmt"
"path"
"android/soong/android"
)
// This singleton collects Rust crate definitions and generates a JSON file
// (${OUT_DIR}/soong/rust-project.json) which can be use by external tools,
// such as rust-analyzer. It does so when either make, mm, mma, mmm or mmma is
// called. This singleton is enabled only if SOONG_GEN_RUST_PROJECT is set.
// For example,
//
// $ SOONG_GEN_RUST_PROJECT=1 m nothing
const (
// Environment variables used to control the behavior of this singleton.
envVariableCollectRustDeps = "SOONG_GEN_RUST_PROJECT"
rustProjectJsonFileName = "rust-project.json"
)
// The format of rust-project.json is not yet finalized. A current description is available at:
// https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/manual.adoc#non-cargo-based-projects
type rustProjectDep struct {
// The Crate attribute is the index of the dependency in the Crates array in rustProjectJson.
Crate int `json:"crate"`
Name string `json:"name"`
}
type rustProjectCrate struct {
RootModule string `json:"root_module"`
Edition string `json:"edition,omitempty"`
Deps []rustProjectDep `json:"deps"`
Cfgs []string `json:"cfgs"`
}
type rustProjectJson struct {
Roots []string `json:"roots"`
Crates []rustProjectCrate `json:"crates"`
}
// crateInfo is used during the processing to keep track of the known crates.
type crateInfo struct {
ID int
Deps map[string]int
}
type projectGeneratorSingleton struct {
project rustProjectJson
knownCrates map[string]crateInfo
}
func rustProjectGeneratorSingleton() android.Singleton {
return &projectGeneratorSingleton{}
}
func init() {
android.RegisterSingletonType("rust_project_generator", rustProjectGeneratorSingleton)
}
// librarySource finds the main source file (.rs) for a crate.
func librarySource(ctx android.SingletonContext, rModule *Module, rustLib *libraryDecorator) (string, bool) {
srcs := rustLib.baseCompiler.Properties.Srcs
if len(srcs) != 0 {
return path.Join(ctx.ModuleDir(rModule), srcs[0]), true
}
if !rustLib.source() {
return "", false
}
// It is a SourceProvider module. If this module is host only, uses the variation for the host.
// Otherwise, use the variation for the primary target.
switch rModule.hod {
case android.HostSupported:
case android.HostSupportedNoCross:
if rModule.Target().String() != ctx.Config().BuildOSTarget.String() {
return "", false
}
default:
if rModule.Target().String() != ctx.Config().AndroidFirstDeviceTarget.String() {
return "", false
}
}
src := rustLib.sourceProvider.Srcs()[0]
return src.String(), true
}
func (singleton *projectGeneratorSingleton) mergeDependencies(ctx android.SingletonContext,
module android.Module, crate *rustProjectCrate, deps map[string]int) {
ctx.VisitDirectDeps(module, func(child android.Module) {
childId, childCrateName, ok := singleton.appendLibraryAndDeps(ctx, child)
if !ok {
return
}
if _, ok = deps[ctx.ModuleName(child)]; ok {
return
}
crate.Deps = append(crate.Deps, rustProjectDep{Crate: childId, Name: childCrateName})
deps[ctx.ModuleName(child)] = childId
})
}
// appendLibraryAndDeps creates a rustProjectCrate for the module argument and appends it to singleton.project.
// It visits the dependencies of the module depth-first so the dependency ID can be added to the current module. If the
// current module is already in singleton.knownCrates, its dependencies are merged. Returns a tuple (id, crate_name, ok).
func (singleton *projectGeneratorSingleton) appendLibraryAndDeps(ctx android.SingletonContext, module android.Module) (int, string, bool) {
rModule, ok := module.(*Module)
if !ok {
return 0, "", false
}
if rModule.compiler == nil {
return 0, "", false
}
rustLib, ok := rModule.compiler.(*libraryDecorator)
if !ok {
return 0, "", false
}
moduleName := ctx.ModuleName(module)
crateName := rModule.CrateName()
if cInfo, ok := singleton.knownCrates[moduleName]; ok {
// We have seen this crate already; merge any new dependencies.
crate := singleton.project.Crates[cInfo.ID]
singleton.mergeDependencies(ctx, module, &crate, cInfo.Deps)
singleton.project.Crates[cInfo.ID] = crate
return cInfo.ID, crateName, true
}
crate := rustProjectCrate{Deps: make([]rustProjectDep, 0), Cfgs: make([]string, 0)}
rootModule, ok := librarySource(ctx, rModule, rustLib)
if !ok {
return 0, "", false
}
crate.RootModule = rootModule
crate.Edition = rustLib.baseCompiler.edition()
deps := make(map[string]int)
singleton.mergeDependencies(ctx, module, &crate, deps)
id := len(singleton.project.Crates)
singleton.knownCrates[moduleName] = crateInfo{ID: id, Deps: deps}
singleton.project.Crates = append(singleton.project.Crates, crate)
// rust-analyzer requires that all crates belong to at least one root:
// https://github.com/rust-analyzer/rust-analyzer/issues/4735.
singleton.project.Roots = append(singleton.project.Roots, path.Dir(crate.RootModule))
return id, crateName, true
}
func (singleton *projectGeneratorSingleton) GenerateBuildActions(ctx android.SingletonContext) {
if !ctx.Config().IsEnvTrue(envVariableCollectRustDeps) {
return
}
singleton.knownCrates = make(map[string]crateInfo)
ctx.VisitAllModules(func(module android.Module) {
singleton.appendLibraryAndDeps(ctx, module)
})
path := android.PathForOutput(ctx, rustProjectJsonFileName)
err := createJsonFile(singleton.project, path)
if err != nil {
ctx.Errorf(err.Error())
}
}
func createJsonFile(project rustProjectJson, rustProjectPath android.WritablePath) error {
buf, err := json.MarshalIndent(project, "", " ")
if err != nil {
return fmt.Errorf("JSON marshal of rustProjectJson failed: %s", err)
}
err = android.WriteFileToOutputDir(rustProjectPath, buf, 0666)
if err != nil {
return fmt.Errorf("Writing rust-project to %s failed: %s", rustProjectPath.String(), err)
}
return nil
}
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