Add apex.use_vndk_as_stable property

Vendor APEXes(in general, APEXes for non-system partitions) which is
supposed to be tied to a specific VNDK version can set this new property
so that it excludes VNDK libs and use them from VNDK APEX (provided by
system parition).

For these APEXes to use VNDK libs from VNDK APEX, linkerconfig should
link "vndk" linker namespace to the namespaces of these APEXes.

Bug: 159195575
Test: m (soong test added)
Change-Id: If90650973239ef7aab0ff084488bda57d9b0364e

apex/apex.go

@@ -691,6 +691,14 @@ func apexDepsMutator(mctx android.TopDownMutatorContext) {
 		MinSdkVersion: a.minSdkVersion(mctx),
 		Updatable:     a.Updatable(),
 	}
+
+	useVndk := a.SocSpecific() || a.DeviceSpecific() || (a.ProductSpecific() && mctx.Config().EnforceProductPartitionInterface())
+	excludeVndkLibs := useVndk && proptools.Bool(a.properties.Use_vndk_as_stable)
+	if !useVndk && proptools.Bool(a.properties.Use_vndk_as_stable) {
+		mctx.PropertyErrorf("use_vndk_as_stable", "not supported for system/system_ext APEXes")
+		return
+	}
+
 	mctx.WalkDeps(func(child, parent android.Module) bool {
 		am, ok := child.(android.ApexModule)
 		if !ok || !am.CanHaveApexVariants() {
@@ -699,6 +707,11 @@ func apexDepsMutator(mctx android.TopDownMutatorContext) {
 		if !parent.(android.DepIsInSameApex).DepIsInSameApex(mctx, child) && !inAnySdk(child) {
 			return false
 		}
+		if excludeVndkLibs {
+			if c, ok := child.(*cc.Module); ok && c.IsVndk() {
+				return false
+			}
+		}
 
 		depName := mctx.OtherModuleName(child)
 		// If the parent is apexBundle, this child is directly depended.
@@ -1009,6 +1022,11 @@ type apexBundleProperties struct {
 
 	// The minimum SDK version that this apex must be compatibile with.
 	Min_sdk_version *string
+
+	// If set true, VNDK libs are considered as stable libs and are not included in this apex.
+	// Should be only used in non-system apexes (e.g. vendor: true).
+	// Default is false.
+	Use_vndk_as_stable *bool
 }
 
 type apexTargetBundleProperties struct {
@@ -1821,7 +1839,8 @@ func (a *apexBundle) checkApexAvailability(ctx android.ModuleContext) {
 
 	// Because APEXes targeting other than system/system_ext partitions
 	// can't set apex_available, we skip checks for these APEXes
-	if ctx.SocSpecific() || ctx.DeviceSpecific() || ctx.ProductSpecific() {
+	if a.SocSpecific() || a.DeviceSpecific() ||
+		(a.ProductSpecific() && ctx.Config().EnforceProductPartitionInterface()) {
 		return
 	}
 
@@ -2137,6 +2156,13 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 							// don't include it in this APEX
 							return false
 						}
+						if cc.UseVndk() && proptools.Bool(a.properties.Use_vndk_as_stable) && cc.IsVndk() {
+							// For vendor APEX with use_vndk_as_stable: true, we don't include VNDK libs
+							// and use them from VNDK APEX.
+							// TODO(b/159576928): add "vndk" as requiredDeps so that linkerconfig can make "vndk"
+							// linker namespace avaiable to this apex.
+							return false
+						}
 						af := apexFileForNativeLibrary(ctx, cc, handleSpecialLibs)
 						af.transitiveDep = true
 						if !a.Host() && !android.DirectlyInApex(ctx.ModuleName(), depName) && (cc.IsStubs() || cc.HasStubsVariants()) {
@@ -2254,7 +2280,8 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 
 	// APEXes targeting other than system/system_ext partitions use vendor/product variants.
 	// So we can't link them to /system/lib libs which are core variants.
-	if a.SocSpecific() || a.DeviceSpecific() || a.ProductSpecific() {
+	if a.SocSpecific() || a.DeviceSpecific() ||
+		(a.ProductSpecific() && ctx.Config().EnforceProductPartitionInterface()) {
 		a.linkToSystemLib = false
 	}
 

apex/apex_test.go

@@ -2203,6 +2203,55 @@ func TestVendorApex(t *testing.T) {
 	ensureContains(t, androidMk, `LOCAL_MODULE_PATH := /tmp/target/product/test_device/vendor/apex`)
 }
 
+func TestVendorApex_use_vndk_as_stable(t *testing.T) {
+	ctx, _ := testApex(t, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			binaries: ["mybin"],
+			vendor: true,
+			use_vndk_as_stable: true,
+		}
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+		cc_binary {
+			name: "mybin",
+			vendor: true,
+			shared_libs: ["libvndk", "libvendor"],
+		}
+		cc_library {
+			name: "libvndk",
+			vndk: {
+				enabled: true,
+			},
+			vendor_available: true,
+		}
+		cc_library {
+			name: "libvendor",
+			vendor: true,
+		}
+	`)
+
+	vendorVariant := "android_vendor.VER_arm64_armv8-a"
+
+	ldRule := ctx.ModuleForTests("mybin", vendorVariant+"_myapex").Rule("ld")
+	libs := names(ldRule.Args["libFlags"])
+	// VNDK libs(libvndk/libc++) as they are
+	ensureListContains(t, libs, buildDir+"/.intermediates/libvndk/"+vendorVariant+"_shared/libvndk.so")
+	ensureListContains(t, libs, buildDir+"/.intermediates/libc++/"+vendorVariant+"_shared/libc++.so")
+	// non-stable Vendor libs as APEX variants
+	ensureListContains(t, libs, buildDir+"/.intermediates/libvendor/"+vendorVariant+"_shared_myapex/libvendor.so")
+
+	// VNDK libs are not included when use_vndk_as_stable: true
+	ensureExactContents(t, ctx, "myapex", "android_common_myapex_image", []string{
+		"bin/mybin",
+		"lib64/libvendor.so",
+	})
+}
+
 func TestAndroidMk_UseVendorRequired(t *testing.T) {
 	ctx, config := testApex(t, `
 		apex {