| commit | c024f0380c9c82d90456c75827d78164ea182d81 | [log] [tgz] |
|---|---|---|
| author | Paul Duffin <[email protected]> | Thu Mar 10 18:37:12 2022 +0000 |
| committer | Paul Duffin <[email protected]> | Thu Mar 10 18:39:54 2022 +0000 |
| tree | 4382efb6ae7f1a2762d664c41e6e7eb270a9336d | |
| parent | 486bf22c09311e50d1b136e58b97bc6e7820e503 [diff] |
Remove implementation details from sdkext hidden api flags
Ran the following to compute the set of split_packages and
package_prefixes properties.
m analyze_bcpf &&
analyze_bcpf --bcpf com.android.sdkext-bootclasspath-fragment --apex com.android.sdkext --sdk sdkextensions-sdk
Bug: 194063708
Test: m out/soong/hiddenapi/hiddenapi-flags.csv
Change-Id: Ifa40f4e341a4dbf60940d3a7ee6addc469d90af6
SdkExtensions module is responsible for:
The module is packaged in an apex, com.android.sdkext, and has several components:
bin/derive_classpath: a native binary that runs early in the device boot process. It reads individual classpath configs files from the system and other modules, merges them, and defines the definition of *CLASSPATH environ variables.bin/derive_sdk: native binary that runs early in the device boot process and reads metadata of other modules, to set system properties relating to the extension SDK (for instance build.version.extensions.r).javalib/framework-sdkextension.jar: this is a jar on the bootclasspath that exposes APIs to applications to query the extension SDK level.derive_sdk is a program that reads metadata stored in other apex modules, in the form of binary protobuf files in subpath etc/sdkinfo.pb inside each apex. The structure of this protobuf can be seen here. The exact steps for converting a set of metadata files to actual extension versions is likely to change over time, and should not be depended upon.
The module exposes a java class SdkExtensions in the package android.os.ext. The method getExtensionVersion(int) can be used to read the version of a particular sdk extension, e.g. getExtensionVersion(Build.VERSION_CODES.R).
derive_classpath service reads and merges individual config files in the /system/etc/classpaths/ and /apex/*/etc/classpaths. Each config stores protobuf message from classpaths.proto in a proto binary format. Exact merging algorithm that determines the order of the classpath entries is described in derive_classpath.cpp and may change over time.
For every new Android SDK level a new extension version should be defined. These are the steps necessary to do that:
derive_sdk.cpp by:GetSdkLevel with the new enum setderive_sdk_test.cpp verifying the new extensions worksSdkExtensions.getExtensionVersion API support the new extensions.