From ab8f9717f1cb70afd28d67cee61996ef223aa10e Mon Sep 17 00:00:00 2001
From: "Priyanka Advani (xWF)" <padvani@google.com>
Date: Fri, 8 Nov 2024 17:37:24 +0000
Subject: [PATCH] Revert "Deprecating libvendorsupport_llndk_headers"

Revert submission 3334193-no-llndk-versioning

Reason for revert: Droidmonitor created revert  due to b/378038995. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:3334193-no-llndk-versioning

Change-Id: Id8d85be1930bef68f94cee66a0fe29278de48d64
---
 libvendorsupport/Android.bp                   | 29 ++++++++++++
 .../include_llndk/android/llndk-versioning.h  | 45 +++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 libvendorsupport/include_llndk/android/llndk-versioning.h

diff --git a/libvendorsupport/Android.bp b/libvendorsupport/Android.bp
index f9a889b94..a22737c06 100644
--- a/libvendorsupport/Android.bp
+++ b/libvendorsupport/Android.bp
@@ -35,3 +35,32 @@ cc_library {
         "libbase",
     ],
 }
+
+cc_library_headers {
+    name: "libvendorsupport_llndk_headers",
+    host_supported: true,
+    vendor_available: true,
+    recovery_available: true,
+    ramdisk_available: true,
+    vendor_ramdisk_available: true,
+    native_bridge_supported: true,
+
+    export_include_dirs: ["include_llndk"],
+    llndk: {
+        llndk_headers: true,
+    },
+
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
+    min_sdk_version: "apex_inherit",
+
+    system_shared_libs: [],
+    stl: "none",
+
+    // This header library is used for libc and must be available to any sdk
+    // versions.
+    // Setting sdk_version to the lowest version allows the dependencies.
+    sdk_version: "1",
+}
diff --git a/libvendorsupport/include_llndk/android/llndk-versioning.h b/libvendorsupport/include_llndk/android/llndk-versioning.h
new file mode 100644
index 000000000..81d165f47
--- /dev/null
+++ b/libvendorsupport/include_llndk/android/llndk-versioning.h
@@ -0,0 +1,45 @@
+// 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.
+
+#pragma once
+
+// LLNDK (https://source.android.com/docs/core/architecture/vndk/build-system#ll-ndk) is similar to
+// NDK, but uses its own versioning of YYYYMM format for vendor builds. The LLNDK symbols are
+// enabled when the vendor api level is equal to or newer than the ro.board.api_level. These symbols
+// must be annotated in map.txt files with the `# llndk=YYYYMM` annotation. They also must be marked
+// with `__INTRODUCED_IN_LLNDK(YYYYMM)` in the header files. It leaves a no-op annotation for ABI
+// analysis.
+#if !defined(__INTRODUCED_IN_LLNDK)
+#define __INTRODUCED_IN_LLNDK(vendor_api_level) \
+    __attribute__((annotate("introduced_in_llndk=" #vendor_api_level)))
+#endif
+
+#if defined(__ANDROID_VENDOR_API__)
+// __ANDROID_VENDOR_API__ is defined only for vendor or product variant modules.
+// Use this macro as an `if` statement to call an API that are available to both NDK and LLNDK.
+// This returns true for vendor or product modules if the vendor_api_level is less than or equal to
+// the ro.board.api_level.
+#define API_LEVEL_AT_LEAST(sdk_api_level, vendor_api_level) \
+    constexpr(__ANDROID_VENDOR_API__ >= vendor_api_level)
+
+#else  // __ANDROID_VENDOR_API__
+
+// For non-vendor modules, API_LEVEL_AT_LEAST is replaced with __builtin_available(sdk_api_level) to
+// guard the API for __INTRODUCED_IN.
+#if !defined(API_LEVEL_AT_LEAST)
+#define API_LEVEL_AT_LEAST(sdk_api_level, vendor_api_level) \
+    (__builtin_available(android sdk_api_level, *))
+#endif
+
+#endif  // __ANDROID_VENDOR_API__