[Ravenwood] Move Ravenwood processing out of individual repos

Move all Ravenwood specific bytecode post-processing steps outside of
individual repo/modules and move it to f/b/ravenwood.

Flag: EXEMPT host test change only
Bug: 292141694
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
Change-Id: I8f7a30a0da970dea0d400844b577cf3595e77943

4 files changed, 331 insertions, 256 deletions

diff --git a/Android.bp b/Android.bp
index 5b6e65c6e4bd..b114898f3887 100644
--- a/Android.bp
+++ b/Android.bp
@@ -168,12 +168,6 @@ java_library {
         //same purpose.
         "//external/robolectric:__subpackages__",
         "//frameworks/layoutlib:__subpackages__",
-
-        // This is for the same purpose as robolectric -- to build "framework.jar" for host-side
-        // testing.
-        // TODO: Once Ravenwood is stable, move the host side jar targets to this directory,
-        // and remove this line.
-        "//frameworks/base/tools/hoststubgen:__subpackages__",
     ],
 }
 
diff --git a/Ravenwood.bp b/Ravenwood.bp
index ec58210e1e3b..2e038e00bb35 100644
--- a/Ravenwood.bp
+++ b/Ravenwood.bp
@@ -12,256 +12,19 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// We need this "trampoline" rule to force soong to give a host-side jar to
-// framework-minus-apex.ravenwood-base. Otherwise, soong would mix up the arch (?) and we'd get
-// a dex jar.
-java_library {
-    name: "framework-minus-apex-for-hoststubgen",
-    installable: false, // host only jar.
-    static_libs: [
-        "framework-minus-apex",
-    ],
-    sdk_version: "core_platform",
-    visibility: ["//visibility:private"],
-}
-
-// Process framework-all with hoststubgen for Ravenwood.
-// This step takes several tens of seconds, so we manually shard it to multiple modules.
-// All the copies have to be kept in sync.
-// TODO: Do the sharding better, either by making hostsubgen support sharding natively, or
-// making a better build rule.
-
-genrule_defaults {
-    name: "framework-minus-apex.ravenwood-base_defaults",
-    defaults: ["ravenwood-internal-only-visibility-genrule"],
-    tools: ["hoststubgen"],
-    srcs: [
-        ":framework-minus-apex-for-hoststubgen",
-        ":ravenwood-framework-policies",
-        ":ravenwood-standard-options",
-        ":ravenwood-annotation-allowed-classes",
-    ],
-    out: [
-        "ravenwood.jar",
-        "hoststubgen_framework-minus-apex.log",
-    ],
-}
-
-framework_minus_apex_cmd = "$(location hoststubgen) " +
-    "@$(location :ravenwood-standard-options) " +
-    "--debug-log $(location hoststubgen_framework-minus-apex.log) " +
-    "--out-jar $(location ravenwood.jar) " +
-    "--in-jar $(location :framework-minus-apex-for-hoststubgen) " +
-    "--policy-override-file $(location :ravenwood-framework-policies) " +
-    "--annotation-allowed-classes-file $(location :ravenwood-annotation-allowed-classes) "
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X0",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 0",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X1",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 1",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X2",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 2",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X3",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 3",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X4",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 4",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X5",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 5",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X6",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 6",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X7",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 7",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X8",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 8",
-}
-
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_X9",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 9",
-}
-
-// Build framework-minus-apex.ravenwood-base without sharding.
-// We extract the various dump files from this one, rather than the sharded ones, because
-// some dumps use the output from other classes (e.g. base classes) which may not be in the
-// same shard. Also some of the dump files ("apis") may be slow even when sharded, because
-// the output contains the information from all the input classes, rather than the output classes.
-// Not using sharding is fine for this module because it's only used for collecting the
-// dump / stats files, which don't have to happen regularly.
-java_genrule {
-    name: "framework-minus-apex.ravenwood-base_all",
-    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
-    cmd: framework_minus_apex_cmd +
-        "--stats-file $(location hoststubgen_framework-minus-apex_stats.csv) " +
-        "--supported-api-list-file $(location hoststubgen_framework-minus-apex_apis.csv) " +
-
-        "--gen-keep-all-file $(location hoststubgen_framework-minus-apex_keep_all.txt) " +
-        "--gen-input-dump-file $(location hoststubgen_framework-minus-apex_dump.txt) ",
-
-    out: [
-        "hoststubgen_framework-minus-apex_keep_all.txt",
-        "hoststubgen_framework-minus-apex_dump.txt",
-        "hoststubgen_framework-minus-apex_stats.csv",
-        "hoststubgen_framework-minus-apex_apis.csv",
-    ],
-}
-
-// Marge all the sharded jars
-java_genrule {
-    name: "framework-minus-apex.ravenwood",
-    defaults: ["ravenwood-internal-only-visibility-java"],
-    cmd: "$(location merge_zips) $(out) $(in)",
-    tools: ["merge_zips"],
-    srcs: [
-        ":framework-minus-apex.ravenwood-base_X0{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X1{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X2{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X3{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X4{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X5{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X6{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X7{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X8{ravenwood.jar}",
-        ":framework-minus-apex.ravenwood-base_X9{ravenwood.jar}",
-    ],
-    out: [
-        "framework-minus-apex.ravenwood.jar",
-    ],
-}
+// "framework-minus-apex" and "all-updatable-modules-system-stubs" are not
+// visible publicly. We re-export them to Ravenwood in this file.
 
 java_library {
-    name: "services.core-for-hoststubgen",
-    installable: false, // host only jar.
-    static_libs: [
-        "services.core",
-    ],
-    sdk_version: "core_platform",
-    visibility: ["//visibility:private"],
-}
-
-java_genrule {
-    name: "services.core.ravenwood-base",
-    tools: ["hoststubgen"],
-    cmd: "$(location hoststubgen) " +
-        "@$(location :ravenwood-standard-options) " +
-
-        "--debug-log $(location hoststubgen_services.core.log) " +
-        "--stats-file $(location hoststubgen_services.core_stats.csv) " +
-        "--supported-api-list-file $(location hoststubgen_services.core_apis.csv) " +
-
-        "--out-jar $(location ravenwood.jar) " +
-
-        "--gen-keep-all-file $(location hoststubgen_services.core_keep_all.txt) " +
-        "--gen-input-dump-file $(location hoststubgen_services.core_dump.txt) " +
-
-        "--in-jar $(location :services.core-for-hoststubgen) " +
-        "--policy-override-file $(location :ravenwood-services-policies) " +
-        "--annotation-allowed-classes-file $(location :ravenwood-annotation-allowed-classes) ",
-    srcs: [
-        ":services.core-for-hoststubgen",
-        ":ravenwood-services-policies",
-        ":ravenwood-standard-options",
-        ":ravenwood-annotation-allowed-classes",
-    ],
-    out: [
-        "ravenwood.jar",
-
-        // Following files are created just as FYI.
-        "hoststubgen_services.core_keep_all.txt",
-        "hoststubgen_services.core_dump.txt",
-
-        "hoststubgen_services.core.log",
-        "hoststubgen_services.core_stats.csv",
-        "hoststubgen_services.core_apis.csv",
-    ],
-    defaults: ["ravenwood-internal-only-visibility-genrule"],
-}
-
-java_genrule {
-    name: "services.core.ravenwood",
-    defaults: ["ravenwood-internal-only-visibility-genrule"],
-    cmd: "cp $(in) $(out)",
-    srcs: [
-        ":services.core.ravenwood-base{ravenwood.jar}",
-    ],
-    out: [
-        "services.core.ravenwood.jar",
-    ],
-}
-
-// TODO(b/313930116) This jarjar is a bit slow. We should use hoststubgen for renaming,
-// but services.core.ravenwood has complex dependencies, so it'll take more than
-// just using hoststubgen "rename"s.
-java_library {
-    name: "services.core.ravenwood-jarjar",
-    defaults: ["ravenwood-internal-only-visibility-java"],
+    name: "framework-minus-apex-for-host",
     installable: false,
-    static_libs: [
-        "services.core.ravenwood",
-    ],
-    jarjar_rules: ":ravenwood-services-jarjar-rules",
+    static_libs: ["framework-minus-apex"],
+    visibility: ["//frameworks/base/ravenwood"],
 }
 
-// Jars in "ravenwood-runtime" are set to the classpath, sorted alphabetically.
-// Rename some of the dependencies to make sure they're included in the intended order.
 java_library {
-    name: "100-framework-minus-apex.ravenwood",
-    defaults: ["ravenwood-internal-only-visibility-java"],
-    static_libs: [
-        "framework-minus-apex.ravenwood",
-    ],
-    sdk_version: "core_platform",
-    // See b/313930116. Jarjar is too slow on this jar. We use HostStubGen to do the rename.
-    // jarjar_rules: ":ravenwood-framework-jarjar-rules",
-}
-
-java_genrule {
-    // Use 200 to make sure it comes before the mainline stub ("all-updatable...").
-    name: "200-kxml2-android",
-    defaults: ["ravenwood-internal-only-visibility-genrule"],
-    cmd: "cp $(in) $(out)",
-    srcs: [":kxml2-android"],
-    out: ["200-kxml2-android.jar"],
-}
-
-java_genrule {
-    name: "z00-all-updatable-modules-system-stubs",
-    defaults: ["ravenwood-internal-only-visibility-genrule"],
-    cmd: "cp $(in) $(out)",
-    srcs: [":all-updatable-modules-system-stubs"],
-    out: ["z00-all-updatable-modules-system-stubs.jar"],
+    name: "all-updatable-modules-system-stubs-for-host",
+    installable: false,
+    static_libs: ["all-updatable-modules-system-stubs"],
+    visibility: ["//frameworks/base/ravenwood"],
 }
diff --git a/ravenwood/Android.bp b/ravenwood/Android.bp
index 11b66fc3f1e5..0cf9ff0ab3b5 100644
--- a/ravenwood/Android.bp
+++ b/ravenwood/Android.bp
@@ -16,7 +16,7 @@ filegroup {
     srcs: [
         "texts/ravenwood-services-policies.txt",
     ],
-    visibility: ["//visibility:public"],
+    visibility: ["//visibility:private"],
 }
 
 filegroup {
@@ -24,7 +24,7 @@ filegroup {
     srcs: [
         "texts/ravenwood-framework-policies.txt",
     ],
-    visibility: ["//visibility:public"],
+    visibility: ["//visibility:private"],
 }
 
 filegroup {
@@ -32,7 +32,7 @@ filegroup {
     srcs: [
         "texts/ravenwood-standard-options.txt",
     ],
-    visibility: ["//visibility:public"],
+    visibility: ["//visibility:private"],
 }
 
 filegroup {
@@ -40,7 +40,7 @@ filegroup {
     srcs: [
         "texts/ravenwood-annotation-allowed-classes.txt",
     ],
-    visibility: ["//visibility:public"],
+    visibility: ["//visibility:private"],
 }
 
 // This and the next module contain the same classes with different implementations.
@@ -335,6 +335,30 @@ java_library {
     ],
 }
 
+// JARs in "ravenwood-runtime" are set to the classpath, sorted alphabetically.
+// Rename some of the dependencies to make sure they're included in the intended order.
+
+java_library {
+    name: "100-framework-minus-apex.ravenwood",
+    installable: false,
+    static_libs: ["framework-minus-apex.ravenwood"],
+    visibility: ["//visibility:private"],
+}
+
+java_library {
+    name: "200-kxml2-android",
+    installable: false,
+    static_libs: ["kxml2-android"],
+    visibility: ["//visibility:private"],
+}
+
+java_library {
+    name: "z00-all-updatable-modules-system-stubs",
+    installable: false,
+    static_libs: ["all-updatable-modules-system-stubs-for-host"],
+    visibility: ["//visibility:private"],
+}
+
 android_ravenwood_libgroup {
     name: "ravenwood-runtime",
     data: [
@@ -393,3 +417,7 @@ android_ravenwood_libgroup {
         "inline-mockito-ravenwood-prebuilt",
     ],
 }
+
+build = [
+    "Framework.bp",
+]
diff --git a/ravenwood/Framework.bp b/ravenwood/Framework.bp
new file mode 100644
index 000000000000..07b453431751
--- /dev/null
+++ b/ravenwood/Framework.bp
@@ -0,0 +1,290 @@
+// Copyright (C) 2024 The Android Open Source Project
+//
+// 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.
+
+// This file hosts all the genrule and module definitions for all Android specific
+// code that needs further post-processing by hoststubgen to support Ravenwood.
+
+/////////////////////////
+// framework-minus-apex
+/////////////////////////
+
+// Process framework-minus-apex with hoststubgen for Ravenwood.
+// This step takes several tens of seconds, so we manually shard it to multiple modules.
+// All the copies have to be kept in sync.
+// TODO: Do the sharding better, either by making hostsubgen support sharding natively, or
+// making a better build rule.
+
+genrule_defaults {
+    name: "framework-minus-apex.ravenwood-base_defaults",
+    tools: ["hoststubgen"],
+    srcs: [
+        ":framework-minus-apex-for-host",
+        ":ravenwood-framework-policies",
+        ":ravenwood-standard-options",
+        ":ravenwood-annotation-allowed-classes",
+    ],
+    out: [
+        "ravenwood.jar",
+        "hoststubgen_framework-minus-apex.log",
+    ],
+    visibility: ["//visibility:private"],
+}
+
+framework_minus_apex_cmd = "$(location hoststubgen) " +
+    "@$(location :ravenwood-standard-options) " +
+    "--debug-log $(location hoststubgen_framework-minus-apex.log) " +
+    "--out-jar $(location ravenwood.jar) " +
+    "--in-jar $(location :framework-minus-apex-for-host) " +
+    "--policy-override-file $(location :ravenwood-framework-policies) " +
+    "--annotation-allowed-classes-file $(location :ravenwood-annotation-allowed-classes) "
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X0",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 0",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X1",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 1",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X2",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 2",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X3",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 3",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X4",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 4",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X5",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 5",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X6",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 6",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X7",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 7",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X8",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 8",
+}
+
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_X9",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd + " --num-shards 10 --shard-index 9",
+}
+
+// Build framework-minus-apex.ravenwood-base without sharding.
+// We extract the various dump files from this one, rather than the sharded ones, because
+// some dumps use the output from other classes (e.g. base classes) which may not be in the
+// same shard. Also some of the dump files ("apis") may be slow even when sharded, because
+// the output contains the information from all the input classes, rather than the output classes.
+// Not using sharding is fine for this module because it's only used for collecting the
+// dump / stats files, which don't have to happen regularly.
+java_genrule {
+    name: "framework-minus-apex.ravenwood-base_all",
+    defaults: ["framework-minus-apex.ravenwood-base_defaults"],
+    cmd: framework_minus_apex_cmd +
+        "--stats-file $(location hoststubgen_framework-minus-apex_stats.csv) " +
+        "--supported-api-list-file $(location hoststubgen_framework-minus-apex_apis.csv) " +
+
+        "--gen-keep-all-file $(location hoststubgen_framework-minus-apex_keep_all.txt) " +
+        "--gen-input-dump-file $(location hoststubgen_framework-minus-apex_dump.txt) ",
+
+    out: [
+        "hoststubgen_framework-minus-apex_keep_all.txt",
+        "hoststubgen_framework-minus-apex_dump.txt",
+        "hoststubgen_framework-minus-apex_stats.csv",
+        "hoststubgen_framework-minus-apex_apis.csv",
+    ],
+}
+
+// Marge all the sharded jars
+java_genrule {
+    name: "framework-minus-apex.ravenwood",
+    defaults: ["ravenwood-internal-only-visibility-java"],
+    cmd: "$(location merge_zips) $(out) $(in)",
+    tools: ["merge_zips"],
+    srcs: [
+        ":framework-minus-apex.ravenwood-base_X0{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X1{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X2{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X3{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X4{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X5{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X6{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X7{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X8{ravenwood.jar}",
+        ":framework-minus-apex.ravenwood-base_X9{ravenwood.jar}",
+    ],
+    out: [
+        "framework-minus-apex.ravenwood.jar",
+    ],
+}
+
+//////////////////
+// services.core
+//////////////////
+
+java_library {
+    name: "services.core-for-host",
+    installable: false, // host only jar.
+    static_libs: [
+        "services.core",
+    ],
+    sdk_version: "core_platform",
+    visibility: ["//visibility:private"],
+}
+
+java_genrule {
+    name: "services.core.ravenwood-base",
+    tools: ["hoststubgen"],
+    cmd: "$(location hoststubgen) " +
+        "@$(location :ravenwood-standard-options) " +
+
+        "--debug-log $(location hoststubgen_services.core.log) " +
+        "--stats-file $(location hoststubgen_services.core_stats.csv) " +
+        "--supported-api-list-file $(location hoststubgen_services.core_apis.csv) " +
+
+        "--out-jar $(location ravenwood.jar) " +
+
+        "--gen-keep-all-file $(location hoststubgen_services.core_keep_all.txt) " +
+        "--gen-input-dump-file $(location hoststubgen_services.core_dump.txt) " +
+
+        "--in-jar $(location :services.core-for-host) " +
+        "--policy-override-file $(location :ravenwood-services-policies) " +
+        "--annotation-allowed-classes-file $(location :ravenwood-annotation-allowed-classes) ",
+    srcs: [
+        ":services.core-for-host",
+        ":ravenwood-services-policies",
+        ":ravenwood-standard-options",
+        ":ravenwood-annotation-allowed-classes",
+    ],
+    out: [
+        "ravenwood.jar",
+
+        // Following files are created just as FYI.
+        "hoststubgen_services.core_keep_all.txt",
+        "hoststubgen_services.core_dump.txt",
+
+        "hoststubgen_services.core.log",
+        "hoststubgen_services.core_stats.csv",
+        "hoststubgen_services.core_apis.csv",
+    ],
+    visibility: ["//visibility:private"],
+}
+
+java_genrule {
+    name: "services.core.ravenwood",
+    defaults: ["ravenwood-internal-only-visibility-genrule"],
+    cmd: "cp $(in) $(out)",
+    srcs: [
+        ":services.core.ravenwood-base{ravenwood.jar}",
+    ],
+    out: [
+        "services.core.ravenwood.jar",
+    ],
+}
+
+// TODO(b/313930116) This jarjar is a bit slow. We should use hoststubgen for renaming,
+// but services.core.ravenwood has complex dependencies, so it'll take more than
+// just using hoststubgen "rename"s.
+java_library {
+    name: "services.core.ravenwood-jarjar",
+    defaults: ["ravenwood-internal-only-visibility-java"],
+    installable: false,
+    static_libs: [
+        "services.core.ravenwood",
+    ],
+    jarjar_rules: ":ravenwood-services-jarjar-rules",
+}
+
+///////////////
+// core-icu4j
+///////////////
+
+java_genrule {
+    name: "core-icu4j-for-host.ravenwood-base",
+    tools: ["hoststubgen"],
+    cmd: "$(location hoststubgen) " +
+        "@$(location :ravenwood-standard-options) " +
+
+        "--debug-log $(location hoststubgen_core-icu4j-for-host.log) " +
+        "--stats-file $(location hoststubgen_core-icu4j-for-host_stats.csv) " +
+        "--supported-api-list-file $(location hoststubgen_core-icu4j-for-host_apis.csv) " +
+
+        "--out-jar $(location ravenwood.jar) " +
+
+        "--gen-keep-all-file $(location hoststubgen_core-icu4j-for-host_keep_all.txt) " +
+        "--gen-input-dump-file $(location hoststubgen_core-icu4j-for-host_dump.txt) " +
+
+        "--in-jar $(location :core-icu4j-for-host) " +
+        "--policy-override-file $(location :icu-ravenwood-policies) " +
+        "--annotation-allowed-classes-file $(location :ravenwood-annotation-allowed-classes) ",
+    srcs: [
+        ":core-icu4j-for-host",
+
+        ":icu-ravenwood-policies",
+        ":ravenwood-standard-options",
+        ":ravenwood-annotation-allowed-classes",
+    ],
+    out: [
+        "ravenwood.jar",
+
+        // Following files are created just as FYI.
+        "hoststubgen_core-icu4j-for-host_keep_all.txt",
+        "hoststubgen_core-icu4j-for-host_dump.txt",
+
+        "hoststubgen_core-icu4j-for-host.log",
+        "hoststubgen_core-icu4j-for-host_stats.csv",
+        "hoststubgen_core-icu4j-for-host_apis.csv",
+    ],
+    visibility: ["//visibility:private"],
+}
+
+java_genrule {
+    name: "core-icu4j-for-host.ravenwood",
+    defaults: ["ravenwood-internal-only-visibility-genrule"],
+    cmd: "cp $(in) $(out)",
+    srcs: [
+        ":core-icu4j-for-host.ravenwood-base{ravenwood.jar}",
+    ],
+    out: [
+        "core-icu4j-for-host.ravenwood.jar",
+    ],
+}