Refactor mixed builds to only take one pass
This large refactoring has both immense performance implications and
improves mixed builds complexity / usability. Summary:
1. Queueing calls to Bazel is done in a new mutator instead of a full
soong_build pass. Normal soong_build flow is interrupted (via a
functional hook in blueprint) to invoke bazel and parse its response.
2. Implementing mixed build support for additional modules is as simple
as implementing MixedBuildsBuildable. In this interface, define the
request that must be queued to Bazel, and then subsequently define
how to handle the returned bazel cquery metadata.
3. Mixed builds consists of only a single pass. This greatly
improves mixed build performance.
Result:
A 33% runtime improvement on soong analysis phase with mixed builds.
Caveats:
C++ BazelHandler handling still remains a bit of a mess; I did what
I could within this CL's scope, but this may require additional cleanup.
Test: Treehugger
Test: Verified that aosp_arm ninja file is bit-for-bit identical with or
without this change.
Change-Id: I412d9c94d429105f4ebfafc84100d546069e6621
diff --git a/cc/object.go b/cc/object.go
index bd5bd45..a3be6b1 100644
--- a/cc/object.go
+++ b/cc/object.go
@@ -19,6 +19,7 @@
"android/soong/android"
"android/soong/bazel"
+ "android/soong/bazel/cquery"
)
//
@@ -46,23 +47,30 @@
}
type objectBazelHandler struct {
- android.BazelHandler
+ BazelHandler
module *Module
}
-func (handler *objectBazelHandler) GenerateBazelBuildActions(ctx android.ModuleContext, label string) bool {
+func (handler *objectBazelHandler) QueueBazelCall(ctx android.BaseModuleContext, label string) {
bazelCtx := ctx.Config().BazelContext
- objPaths, ok := bazelCtx.GetOutputFiles(label, android.GetConfigKey(ctx))
- if ok {
- if len(objPaths) != 1 {
- ctx.ModuleErrorf("expected exactly one object file for '%s', but got %s", label, objPaths)
- return false
- }
+ bazelCtx.QueueBazelRequest(label, cquery.GetOutputFiles, android.GetConfigKey(ctx))
+}
- handler.module.outputFile = android.OptionalPathForPath(android.PathForBazelOut(ctx, objPaths[0]))
+func (handler *objectBazelHandler) ProcessBazelQueryResponse(ctx android.ModuleContext, label string) {
+ bazelCtx := ctx.Config().BazelContext
+ objPaths, err := bazelCtx.GetOutputFiles(label, android.GetConfigKey(ctx))
+ if err != nil {
+ ctx.ModuleErrorf(err.Error())
+ return
}
- return ok
+
+ if len(objPaths) != 1 {
+ ctx.ModuleErrorf("expected exactly one object file for '%s', but got %s", label, objPaths)
+ return
+ }
+
+ handler.module.outputFile = android.OptionalPathForPath(android.PathForBazelOut(ctx, objPaths[0]))
}
type ObjectLinkerProperties struct {