commit 7385067640a3a50c9315e040947067c9996df418
author Jingwen Chen <jingwen@google.com> Mon Dec 14 08:25:34 2020 -0500
committer Jingwen Chen <jingwen@google.com> Thu Jan 21 22:46:11 2021 -0500
tree 9e2073cc1c80fa13aa973912d7f3b6699e3f59cf
parent de1357378b9d1bd0a53d77cc2869726d38d15ab6

bp2build: framework for generating BazelTargetModules.

This CL creates the framework necessary for generating
BazelTargetModules from regular Soong Android modules.
BazelTargetModules are code-generated into Bazel targets in BUILD files.

See the follow-up CL for examples of creating filegroup/genrule
BazelTargetModules.

Test: GENERATE_BAZEL_FILES=true m nothing # creates out/soong/bp2build
with no BUILD files, because there are no BazelTargetModules in the
module graph.

Change-Id: I33a96365bd439043b13af6db9e439592e9983188

android/mutator.go

diff --git a/android/mutator.go b/android/mutator.go
index 72c68b2..2a2be6c 100644
--- a/android/mutator.go
+++ b/android/mutator.go
@@ -44,9 +44,16 @@
 	}
 }
 
-func registerMutatorsForBazelConversion(ctx *blueprint.Context) {
-	// FIXME(b/171263886): Start bringing in mutators to make the Bionic
-	// module subgraph suitable for automated conversion.
+// RegisterMutatorsForBazelConversion is a alternate registration pipeline for bp2build. Exported for testing.
+func RegisterMutatorsForBazelConversion(ctx *blueprint.Context, bp2buildMutators []RegisterMutatorFunc) {
+	mctx := &registerMutatorsContext{}
+
+	// Register bp2build mutators
+	for _, f := range bp2buildMutators {
+		f(mctx)
+	}
+
+	registerMutatorsToContext(ctx, mctx.mutators)
 }
 
 func registerMutators(ctx *blueprint.Context, preArch, preDeps, postDeps, finalDeps []RegisterMutatorFunc) {
@@ -196,6 +203,21 @@
 	finalDeps = append(finalDeps, f)
 }
 
+var bp2buildMutators = []RegisterMutatorFunc{}
+
+// RegisterBp2BuildMutator registers specially crafted mutators for
+// converting Blueprint/Android modules into special modules that can
+// be code-generated into Bazel BUILD targets.
+//
+// TODO(b/178068862): bring this into TestContext.
+func RegisterBp2BuildMutator(moduleType string, m func(TopDownMutatorContext)) {
+	mutatorName := moduleType + "_bp2build"
+	f := func(ctx RegisterMutatorsContext) {
+		ctx.TopDown(mutatorName, m)
+	}
+	bp2buildMutators = append(bp2buildMutators, f)
+}
+
 type BaseMutatorContext interface {
 	BaseModuleContext