Implement fdo_profile module type

Introducing fdo_profile module type to reimplement the afdo support in cc moduels. This change allows the feature to be compatible with Bazel migration.

How it works:

PreDepsMutators:
  * BeginMutator: If non-static cc modules sets afdo prop, search and add corresponding fdo_profile module as a dep with fdoProfileTag
  * fdoProfileMutator:
    * If in fdo_profile module, set FdoProfileProvider with full path to profile
    * If in cc module, read FdoProfileProvider from dep with fdoProfileTag and set FdoProfileInfo.Path to FdoProfilePath field

PostDepsMutators:
  * afdoDepsMutator: If a module has FdoProfilePath set, walk to its static deps and set itself to the deps' AfdoRdeps
  * afdoMutator: If a static dep has AfdoRDeps set, create afdo variant.

Ignore-AOSP-First: Other CLs in the same topic are internal-only
Test: go test
Bug: b/267229065
Change-Id: I687d798a02d9743c92804fea36fb4ae3a7a0e5e3

cc/fdo_profile.go

@@ -0,0 +1,85 @@
+// Copyright 2023 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 cc
+
+import (
+	"android/soong/android"
+
+	"github.com/google/blueprint"
+)
+
+func init() {
+	RegisterFdoProfileBuildComponents(android.InitRegistrationContext)
+}
+
+func RegisterFdoProfileBuildComponents(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("fdo_profile", fdoProfileFactory)
+}
+
+type fdoProfile struct {
+	android.ModuleBase
+
+	properties fdoProfileProperties
+}
+
+type fdoProfileProperties struct {
+	Profile *string `android:"arch_variant"`
+}
+
+// FdoProfileInfo is provided by FdoProfileProvider
+type FdoProfileInfo struct {
+	Path android.Path
+}
+
+// FdoProfileProvider is used to provide path to an fdo profile
+var FdoProfileProvider = blueprint.NewMutatorProvider(FdoProfileInfo{}, "fdo_profile")
+
+// FdoProfileMutatorInterface is the interface implemented by fdo_profile module type
+// module types that can depend on an fdo_profile module
+type FdoProfileMutatorInterface interface {
+	// FdoProfileMutator eithers set or get FdoProfileProvider
+	FdoProfileMutator(ctx android.BottomUpMutatorContext)
+}
+
+var _ FdoProfileMutatorInterface = (*fdoProfile)(nil)
+
+// GenerateAndroidBuildActions of fdo_profile does not have any build actions
+func (fp *fdoProfile) GenerateAndroidBuildActions(ctx android.ModuleContext) {}
+
+// FdoProfileMutator sets FdoProfileProvider to fdo_profile module
+// or sets afdo.Properties.FdoProfilePath to path in FdoProfileProvider of the depended fdo_profile
+func (fp *fdoProfile) FdoProfileMutator(ctx android.BottomUpMutatorContext) {
+	if fp.properties.Profile != nil {
+		path := android.PathForModuleSrc(ctx, *fp.properties.Profile)
+		ctx.SetProvider(FdoProfileProvider, FdoProfileInfo{
+			Path: path,
+		})
+	}
+}
+
+// fdoProfileMutator calls the generic FdoProfileMutator function of FdoProfileMutator
+// which is implemented by cc and cc.FdoProfile
+func fdoProfileMutator(ctx android.BottomUpMutatorContext) {
+	if f, ok := ctx.Module().(FdoProfileMutatorInterface); ok {
+		f.FdoProfileMutator(ctx)
+	}
+}
+
+func fdoProfileFactory() android.Module {
+	m := &fdoProfile{}
+	m.AddProperties(&m.properties)
+	android.InitAndroidMultiTargetsArchModule(m, android.DeviceSupported, android.MultilibBoth)
+	return m
+}