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Use kapt stubs for kotlin header jar for javac

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When compling kotlin code with annotation processors we are generating
java stubs for the kotlin sources using kapt, and parsing them in
turbine when running the annotation processors.  Passing --output
to turbine will also compile the stubs into a header jar that can
be used as a dependency to javac, allowing the javac and kotlinc
rules to run in parallel.  The turbine-apt header jar can't be used
as the header jar for downstream modules as it doesn't contain the
kotlin metadata needed by kotlinc rules, so the kotlinc gen-jvm-abi
plugin output is still used for the module's final header jar.

Test: TestKapt
Bug: 222095735
Change-Id: I82d0900f3dc30f3e3ebd7cab0693dfe741d9b955
This commit is contained in:
Colin Cross
2022-03-28 18:27:17 -07:00
parent b5db401599
commit c6ef485370
4 changed files with 51 additions and 24 deletions
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30
java/base.go
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@@ -1108,13 +1108,23 @@ func (j *Module) compile(ctx android.ModuleContext, aaptSrcJar android.Path) {
flags.kotlincClasspath = append(flags.kotlincClasspath, flags.bootClasspath...)
flags.kotlincClasspath = append(flags.kotlincClasspath, flags.classpath...)
if len(flags.processorPath) > 0 {
useTurbineApt := len(flags.processorPath) > 0
if useTurbineApt {
// Use kapt for annotation processing
kaptSrcJar := android.PathForModuleOut(ctx, "kapt", "kapt-sources.jar")
kaptResJar := android.PathForModuleOut(ctx, "kapt", "kapt-res.jar")
kotlinKapt(ctx, kaptSrcJar, kaptResJar, kotlinSrcFiles, kotlinCommonSrcFiles, srcJars, flags)
srcJars = append(srcJars, kaptSrcJar)
kotlinJars = append(kotlinJars, kaptResJar)
kotlinTurbineAptHeaderJar := android.PathForModuleOut(ctx, "turbine-apt", "stubs-header.jar")
kotlinTurbineAptSrcJar := android.PathForModuleOut(ctx, "turbine-apt", "anno-sources.jar")
kotlinTurbineAptResJar := android.PathForModuleOut(ctx, "turbine-apt", "anno-res.jar")
kotlinTurbineApt(ctx, kotlinTurbineAptHeaderJar, kotlinTurbineAptSrcJar, kotlinTurbineAptResJar,
kotlinSrcFiles, kotlinCommonSrcFiles, srcJars, flags)
srcJars = append(srcJars, kotlinTurbineAptSrcJar)
kotlinJars = append(kotlinJars, kotlinTurbineAptResJar)
// When annotation processors are enabled we've already created java stubs for
// kotlin files using kapt and compiled them in turbine-apt while running the
// annotation processors, reuse the result as the kotlin header jar for the javac
// action. It can't be used as the header jar for downstream modules to compile
// against because it doesn't contain the kotlin-specific metadata that kotlinc
// needs.
flags.classpath = append(classpath{kotlinTurbineAptHeaderJar}, flags.classpath...)
// Disable annotation processing in javac, it's already been handled by kapt
flags.processorPath = nil
flags.processors = nil
@@ -1127,11 +1137,13 @@ func (j *Module) compile(ctx android.ModuleContext, aaptSrcJar android.Path) {
return
}
// Make javac rule depend on the kotlinc rule
flags.classpath = append(classpath{kotlinHeaderJar}, flags.classpath...)
kotlinJars = append(kotlinJars, kotlinJar)
kotlinHeaderJars = append(kotlinHeaderJars, kotlinHeaderJar)
if !useTurbineApt {
// When annotation processors are not enabled use the kotlinc gen-jvm-abi plugin
// output as the header jar for javac in this module.
flags.classpath = append(classpath{kotlinHeaderJar}, flags.classpath...)
}
// Jar kotlin classes into the final jar after javac
if BoolDefault(j.properties.Static_kotlin_stdlib, true) {