Embed proguard/R8 rules in kotlin-reflect artifact jar

The Android build pipeline can extract embedded proguard configurations
from dependencies and merge them automatically. This adds a conservative
proguard configuration to the kotlin-reflect JVM artifact in support of
that. This focuses mostly on just retaining what's necessary for
kotlin-reflect's own functionality to operate, but could be expanded if
community feedback discovers other good candidate rules.

With this in place - most Android projects using R8 or Proguard should
Just Work™️ with kotlin-reflect.

core/reflection.jvm/resources/META-INF/com.android.tools/proguard/kotlin-reflect.pro

@@ -0,0 +1,21 @@
+# When editing this file, update the following files as well:
+# - META-INF/com.android.tools/r8-from-1.6.0/kotlin-reflect.pro
+# - META-INF/com.android.tools/r8-upto-1.6.0/kotlin-reflect.pro
+# - META-INF/proguard/kotlin-reflect.pro
+# Keep Metadata annotations so they can be parsed at runtime.
+-keep class kotlin.Metadata { *; }
+
+# Keep implementations of service loaded interfaces
+-keep interface kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader
+-keep class * implements kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader { public protected *; }
+-keep interface kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition
+-keep class * implements kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition { public protected *; }
+
+# Keep generic signatures and annotations at runtime.
+-keepattributes Signature,RuntimeVisible*Annotations
+
+# Don't note on API calls from different JVM versions as they're gated properly at runtime.
+-dontnote kotlin.internal.PlatformImplementationsKt
+
+# Don't note on internal APIs, as there is some class relocating that shrinkers may unnecessarily find suspicious.
+-dontwarn kotlin.reflect.jvm.internal.**

core/reflection.jvm/resources/META-INF/com.android.tools/r8-from-1.6.0/kotlin-reflect.pro

@@ -0,0 +1,16 @@
+# When editing this file, update the following files as well:
+# - META-INF/com.android.tools/proguard/kotlin-reflect.pro
+# - META-INF/com.android.tools/r8-upto-1.6.0/kotlin-reflect.pro
+# - META-INF/proguard/kotlin-reflect.pro
+# Keep Metadata annotations so they can be parsed at runtime.
+-keep class kotlin.Metadata { *; }
+
+# Keep generic signatures and annotations at runtime.
+# R8 requires InnerClasses and EnclosingMethod if you keepattributes Signature.
+-keepattributes InnerClasses,Signature,RuntimeVisible*Annotations,EnclosingMethod
+
+# Don't note on API calls from different JVM versions as they're gated properly at runtime.
+-dontnote kotlin.internal.PlatformImplementationsKt
+
+# Don't note on internal APIs, as there is some class relocating that shrinkers may unnecessarily find suspicious.
+-dontwarn kotlin.reflect.jvm.internal.**

core/reflection.jvm/resources/META-INF/com.android.tools/r8-upto-1.6.0/kotlin-reflect.pro

@@ -0,0 +1,23 @@
+# When editing this file, update the following files as well:
+# - META-INF/com.android.tools/proguard/kotlin-reflect.pro
+# - META-INF/com.android.tools/r8-from-1.6.0/kotlin-reflect.pro
+# - META-INF/proguard/kotlin-reflect.pro
+# Keep Metadata annotations so they can be parsed at runtime.
+-keep class kotlin.Metadata { *; }
+
+# Keep implementations of service loaded interfaces
+# R8 will automatically handle these these in 1.6+
+-keep interface kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader
+-keep class * implements kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader { public protected *; }
+-keep interface kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition
+-keep class * implements kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition { public protected *; }
+
+# Keep generic signatures and annotations at runtime.
+# R8 requires InnerClasses and EnclosingMethod if you keepattributes Signature.
+-keepattributes InnerClasses,Signature,RuntimeVisible*Annotations,EnclosingMethod
+
+# Don't note on API calls from different JVM versions as they're gated properly at runtime.
+-dontnote kotlin.internal.PlatformImplementationsKt
+
+# Don't note on internal APIs, as there is some class relocating that shrinkers may unnecessarily find suspicious.
+-dontwarn kotlin.reflect.jvm.internal.**

core/reflection.jvm/resources/META-INF/proguard/kotlin-reflect.pro

@@ -0,0 +1,23 @@
+# When editing this file, update the following files as well:
+# - META-INF/com.android.tools/proguard/kotlin-reflect.pro
+# - META-INF/com.android.tools/r8-from-1.6.0/kotlin-reflect.pro
+# - META-INF/com.android.tools/r8-upto-1.6.0/kotlin-reflect.pro
+# Keep Metadata annotations so they can be parsed at runtime.
+-keep class kotlin.Metadata { *; }
+
+# Keep implementations of service loaded interfaces
+# R8 will automatically handle these these in 1.6+
+-keep interface kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader
+-keep class * implements kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader { public protected *; }
+-keep interface kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition
+-keep class * implements kotlin.reflect.jvm.internal.impl.resolve.ExternalOverridabilityCondition { public protected *; }
+
+# Keep generic signatures and annotations at runtime.
+# R8 requires InnerClasses and EnclosingMethod if you keepattributes Signature.
+-keepattributes InnerClasses,Signature,RuntimeVisible*Annotations,EnclosingMethod
+
+# Don't note on API calls from different JVM versions as they're gated properly at runtime.
+-dontnote kotlin.internal.PlatformImplementationsKt
+
+# Don't note on internal APIs, as there is some class relocating that shrinkers may unnecessarily find suspicious.
+-dontwarn kotlin.reflect.jvm.internal.**

libraries/reflect/api/build.gradle

@@ -11,6 +11,9 @@ sourceSets {
         java {
             srcDir "${rootDir}/core/reflection.jvm/src"
         }
+        resources {
+            srcDir("${rootDir}/core/reflection.jvm/resources")
+        }
     }
 
     if (includeJava9) {