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158 lines
4.8 KiB
158 lines
4.8 KiB
package bp2build
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import (
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"android/soong/android"
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"android/soong/cc/config"
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"fmt"
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"reflect"
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"sort"
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"strings"
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"github.com/google/blueprint/proptools"
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)
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type BazelFile struct {
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Dir string
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Basename string
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Contents string
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}
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func CreateSoongInjectionFiles() []BazelFile {
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var files []BazelFile
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files = append(files, newFile("cc_toolchain", "BUILD", "")) // Creates a //cc_toolchain package.
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files = append(files, newFile("cc_toolchain", "constants.bzl", config.BazelCcToolchainVars()))
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return files
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}
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func CreateBazelFiles(
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ruleShims map[string]RuleShim,
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buildToTargets map[string]BazelTargets,
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mode CodegenMode) []BazelFile {
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var files []BazelFile
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if mode == QueryView {
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// Write top level WORKSPACE.
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files = append(files, newFile("", "WORKSPACE", ""))
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// Used to denote that the top level directory is a package.
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files = append(files, newFile("", GeneratedBuildFileName, ""))
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files = append(files, newFile(bazelRulesSubDir, GeneratedBuildFileName, ""))
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// These files are only used for queryview.
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files = append(files, newFile(bazelRulesSubDir, "providers.bzl", providersBzl))
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for bzlFileName, ruleShim := range ruleShims {
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files = append(files, newFile(bazelRulesSubDir, bzlFileName+".bzl", ruleShim.content))
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}
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files = append(files, newFile(bazelRulesSubDir, "soong_module.bzl", generateSoongModuleBzl(ruleShims)))
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}
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files = append(files, createBuildFiles(buildToTargets, mode)...)
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return files
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}
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func createBuildFiles(buildToTargets map[string]BazelTargets, mode CodegenMode) []BazelFile {
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files := make([]BazelFile, 0, len(buildToTargets))
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for _, dir := range android.SortedStringKeys(buildToTargets) {
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if mode == Bp2Build && !android.ShouldWriteBuildFileForDir(dir) {
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fmt.Printf("[bp2build] Not writing generated BUILD file for dir: '%s'\n", dir)
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continue
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}
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targets := buildToTargets[dir]
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sort.Slice(targets, func(i, j int) bool {
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// this will cover all bp2build generated targets
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if targets[i].name < targets[j].name {
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return true
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}
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// give a strict ordering to content from hand-crafted targets
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return targets[i].content < targets[j].content
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})
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content := soongModuleLoad
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if mode == Bp2Build {
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content = `# This file was automatically generated by bp2build for the Bazel migration project.
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# Feel free to edit or test it, but do *not* check it into your version control system.`
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content += "\n\n"
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content += "package(default_visibility = [\"//visibility:public\"])"
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content += "\n\n"
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content += targets.LoadStatements()
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}
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if content != "" {
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// If there are load statements, add a couple of newlines.
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content += "\n\n"
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}
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content += targets.String()
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files = append(files, newFile(dir, GeneratedBuildFileName, content))
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}
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return files
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}
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func newFile(dir, basename, content string) BazelFile {
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return BazelFile{
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Dir: dir,
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Basename: basename,
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Contents: content,
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}
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}
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const (
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bazelRulesSubDir = "build/bazel/queryview_rules"
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// additional files:
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// * workspace file
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// * base BUILD file
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// * rules BUILD file
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// * rules providers.bzl file
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// * rules soong_module.bzl file
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numAdditionalFiles = 5
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)
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var (
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// Certain module property names are blocklisted/ignored here, for the reasons commented.
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ignoredPropNames = map[string]bool{
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"name": true, // redundant, since this is explicitly generated for every target
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"from": true, // reserved keyword
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"in": true, // reserved keyword
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"size": true, // reserved for tests
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"arch": true, // interface prop type is not supported yet.
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"multilib": true, // interface prop type is not supported yet.
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"target": true, // interface prop type is not supported yet.
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"visibility": true, // Bazel has native visibility semantics. Handle later.
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"features": true, // There is already a built-in attribute 'features' which cannot be overridden.
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}
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)
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func shouldGenerateAttribute(prop string) bool {
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return !ignoredPropNames[prop]
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}
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func shouldSkipStructField(field reflect.StructField) bool {
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if field.PkgPath != "" {
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// Skip unexported fields. Some properties are
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// internal to Soong only, and these fields do not have PkgPath.
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return true
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}
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// fields with tag `blueprint:"mutated"` are exported to enable modification in mutators, etc
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// but cannot be set in a .bp file
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if proptools.HasTag(field, "blueprint", "mutated") {
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return true
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}
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return false
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}
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// FIXME(b/168089390): In Bazel, rules ending with "_test" needs to be marked as
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// testonly = True, forcing other rules that depend on _test rules to also be
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// marked as testonly = True. This semantic constraint is not present in Soong.
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// To work around, rename "*_test" rules to "*_test_".
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func canonicalizeModuleType(moduleName string) string {
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if strings.HasSuffix(moduleName, "_test") {
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return moduleName + "_"
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}
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return moduleName
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}
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