[Ravenwood] Add support for Android Resource (R) files

- Also make ravenwood-stats-collector.sh collect "keep-all" files too.

Bug: 292141694
Test: atest hoststubgentest tiny-framework-dump-test hoststubgen-invoke-test
Change-Id: Ib0943c7c2f28c2558ddabe804d692b379fc178ed

13 files changed, 596 insertions, 14 deletions

diff --git a/Ravenwood.bp b/Ravenwood.bp
index 74b34fbcf2a1..412f2b746887 100644
--- a/Ravenwood.bp
+++ b/Ravenwood.bp
@@ -104,6 +104,18 @@ genrule {
     ],
 }
 
+genrule {
+    name: "framework-minus-apex.ravenwood.keep_all",
+    defaults: ["ravenwood-internal-only-visibility-genrule"],
+    cmd: "cp $(in) $(out)",
+    srcs: [
+        ":framework-minus-apex.ravenwood-base{hoststubgen_keep_all.txt}",
+    ],
+    out: [
+        "hoststubgen_framework-minus-apex_keep_all.txt",
+    ],
+}
+
 java_library {
     name: "services.core-for-hoststubgen",
     installable: false, // host only jar.
@@ -189,6 +201,18 @@ genrule {
     ],
 }
 
+genrule {
+    name: "services.core.ravenwood.keep_all",
+    defaults: ["ravenwood-internal-only-visibility-genrule"],
+    cmd: "cp $(in) $(out)",
+    srcs: [
+        ":services.core.ravenwood-base{hoststubgen_keep_all.txt}",
+    ],
+    out: [
+        "hoststubgen_services.core_keep_all.txt",
+    ],
+}
+
 java_library {
     name: "services.core.ravenwood-jarjar",
     installable: false,
diff --git a/ravenwood/Android.bp b/ravenwood/Android.bp
index bc608c5ac0c0..95cbb6b2130a 100644
--- a/ravenwood/Android.bp
+++ b/ravenwood/Android.bp
@@ -221,7 +221,9 @@ sh_test_host {
     data: [
         ":framework-minus-apex.ravenwood.stats",
         ":framework-minus-apex.ravenwood.apis",
+        ":framework-minus-apex.ravenwood.keep_all",
         ":services.core.ravenwood.stats",
         ":services.core.ravenwood.apis",
+        ":services.core.ravenwood.keep_all",
     ],
 }
diff --git a/ravenwood/scripts/ravenwood-stats-collector.sh b/ravenwood/scripts/ravenwood-stats-collector.sh
index cf58bd2f3717..43b61a46b747 100755
--- a/ravenwood/scripts/ravenwood-stats-collector.sh
+++ b/ravenwood/scripts/ravenwood-stats-collector.sh
@@ -18,8 +18,14 @@
 set -e
 
 # Output files
-stats=/tmp/ravenwood-stats-all.csv
-apis=/tmp/ravenwood-apis-all.csv
+out_dir=/tmp/ravenwood
+stats=$out_dir/ravenwood-stats-all.csv
+apis=$out_dir/ravenwood-apis-all.csv
+keep_all_dir=$out_dir/ravenwood-keep-all/
+
+rm -fr $out_dir
+mkdir -p $out_dir
+mkdir -p $keep_all_dir
 
 # Where the input files are.
 path=$ANDROID_BUILD_TOP/out/host/linux-x86/testcases/ravenwood-stats-checker/x86_64/
@@ -76,3 +82,7 @@ collect_apis() {
 
 collect_stats $stats
 collect_apis $apis
+
+cp *keep_all.txt $keep_all_dir
+echo "Keep all files created at:"
+find $keep_all_dir -type f
\ No newline at end of file
diff --git a/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/AndroidHeuristicsFilter.kt b/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/AndroidHeuristicsFilter.kt
index 16785d1d9598..6b360b79c327 100644
--- a/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/AndroidHeuristicsFilter.kt
+++ b/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/AndroidHeuristicsFilter.kt
@@ -25,6 +25,7 @@ class AndroidHeuristicsFilter(
         val aidlPolicy: FilterPolicyWithReason?,
         val featureFlagsPolicy: FilterPolicyWithReason?,
         val syspropsPolicy: FilterPolicyWithReason?,
+        val rFilePolicy: FilterPolicyWithReason?,
         fallback: OutputFilter
 ) : DelegatingFilter(fallback) {
     override fun getPolicyForClass(className: String): FilterPolicyWithReason {
@@ -37,6 +38,9 @@ class AndroidHeuristicsFilter(
         if (syspropsPolicy != null && classes.isSyspropsClass(className)) {
             return syspropsPolicy
         }
+        if (rFilePolicy != null && classes.isRClass(className)) {
+            return rFilePolicy
+        }
         return super.getPolicyForClass(className)
     }
 }
@@ -74,3 +78,10 @@ private fun ClassNodes.isSyspropsClass(className: String): Boolean {
     return className.startsWith("android/sysprop/")
             && className.endsWith("Properties")
 }
+
+/**
+ * @return if a given class "seems like" an R class or its nested classes.
+ */
+private fun ClassNodes.isRClass(className: String): Boolean {
+    return className.endsWith("/R") || className.contains("/R$")
+}
diff --git a/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/TextFileFilterPolicyParser.kt b/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/TextFileFilterPolicyParser.kt
index 75b5fc8f77ea..c5acd81f1cf2 100644
--- a/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/TextFileFilterPolicyParser.kt
+++ b/tools/hoststubgen/hoststubgen/src/com/android/hoststubgen/filters/TextFileFilterPolicyParser.kt
@@ -17,6 +17,7 @@ package com.android.hoststubgen.filters
 
 import com.android.hoststubgen.ParseException
 import com.android.hoststubgen.asm.ClassNodes
+import com.android.hoststubgen.asm.toHumanReadableClassName
 import com.android.hoststubgen.log
 import com.android.hoststubgen.normalizeTextLine
 import com.android.hoststubgen.whitespaceRegex
@@ -31,13 +32,17 @@ import java.util.Objects
  * Print a class node as a "keep" policy.
  */
 fun printAsTextPolicy(pw: PrintWriter, cn: ClassNode) {
-    pw.printf("class %s\t%s\n", cn.name, "keep")
+    pw.printf("class %s %s\n", cn.name.toHumanReadableClassName(), "keep")
 
-    for (f in cn.fields ?: emptyList()) {
-        pw.printf("  field %s\t%s\n", f.name, "keep")
+    cn.fields?.let {
+        for (f in it.sortedWith(compareBy({ it.name }))) {
+            pw.printf("    field %s %s\n", f.name, "keep")
+        }
     }
-    for (m in cn.methods ?: emptyList()) {
-        pw.printf("  method %s\t%s\t%s\n", m.name, m.desc, "keep")
+    cn.methods?.let {
+        for (m in it.sortedWith(compareBy({ it.name }, { it.desc }))) {
+            pw.printf("    method %s %s %s\n", m.name, m.desc, "keep")
+        }
     }
 }
 
@@ -66,6 +71,7 @@ fun createFilterFromTextPolicyFile(
         var aidlPolicy: FilterPolicyWithReason? = null
         var featureFlagsPolicy: FilterPolicyWithReason? = null
         var syspropsPolicy: FilterPolicyWithReason? = null
+        var rFilePolicy: FilterPolicyWithReason? = null
 
         try {
             BufferedReader(FileReader(filename)).use { reader ->
@@ -162,6 +168,14 @@ fun createFilterFromTextPolicyFile(
                                         syspropsPolicy = policy.withReason(
                                                 "$FILTER_REASON (special-class sysprops)")
                                     }
+                                    SpecialClass.RFile -> {
+                                        if (rFilePolicy != null) {
+                                            throw ParseException(
+                                                "Policy for R file already defined")
+                                        }
+                                        rFilePolicy = policy.withReason(
+                                            "$FILTER_REASON (special-class R file)")
+                                    }
                                 }
                             }
                         }
@@ -225,13 +239,9 @@ fun createFilterFromTextPolicyFile(
             throw e.withSourceInfo(filename, lineNo)
         }
 
-        var ret: OutputFilter = imf
-        if (aidlPolicy != null || featureFlagsPolicy != null || syspropsPolicy != null) {
-            log.d("AndroidHeuristicsFilter enabled")
-            ret = AndroidHeuristicsFilter(
-                    classes, aidlPolicy, featureFlagsPolicy, syspropsPolicy, imf)
-        }
-        return ret
+        // Wrap the in-memory-filter with AHF.
+        return AndroidHeuristicsFilter(
+                classes, aidlPolicy, featureFlagsPolicy, syspropsPolicy, rFilePolicy, imf)
     }
 }
 
@@ -240,6 +250,7 @@ private enum class SpecialClass {
     Aidl,
     FeatureFlags,
     Sysprops,
+    RFile,
 }
 
 private fun resolveSpecialClass(className: String): SpecialClass {
@@ -250,6 +261,7 @@ private fun resolveSpecialClass(className: String): SpecialClass {
         ":aidl" -> return SpecialClass.Aidl
         ":feature_flags" -> return SpecialClass.FeatureFlags
         ":sysprops" -> return SpecialClass.Sysprops
+        ":r" -> return SpecialClass.RFile
     }
     throw ParseException("Invalid special class name \"$className\"")
 }
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/01-hoststubgen-test-tiny-framework-orig-dump.txt b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/01-hoststubgen-test-tiny-framework-orig-dump.txt
index fa8fe6cd384f..931f0c5fa793 100644
--- a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/01-hoststubgen-test-tiny-framework-orig-dump.txt
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/01-hoststubgen-test-tiny-framework-orig-dump.txt
@@ -322,6 +322,78 @@ NestMembers:
 InnerClasses:
   public static #x= #x of #x;            // Stub=class com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub of class com/android/hoststubgen/test/tinyframework/IPretendingAidl
   public static #x= #x of #x;           // Proxy=class com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub$Proxy of class com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub
+## Class: com/android/hoststubgen/test/tinyframework/R$Nested.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R$Nested
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R$Nested
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 1, methods: 2, attributes: 3
+  public static int[] ARRAY;
+    descriptor: [I
+    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
+
+  public com.android.hoststubgen.test.tinyframework.R$Nested();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=1, locals=1, args_size=1
+         x: aload_0
+         x: invokespecial #x                  // Method java/lang/Object."<init>":()V
+         x: return
+      LineNumberTable:
+      LocalVariableTable:
+        Start  Length  Slot  Name   Signature
+            0       5     0  this   Lcom/android/hoststubgen/test/tinyframework/R$Nested;
+
+  static {};
+    descriptor: ()V
+    flags: (0x0008) ACC_STATIC
+    Code:
+      stack=4, locals=0, args_size=0
+         x: iconst_1
+         x: newarray       int
+         x: dup
+         x: iconst_0
+         x: iconst_1
+         x: iastore
+         x: putstatic     #x                  // Field ARRAY:[I
+        x: return
+      LineNumberTable:
+}
+SourceFile: "R.java"
+NestHost: class com/android/hoststubgen/test/tinyframework/R
+InnerClasses:
+  public static #x= #x of #x;           // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+## Class: com/android/hoststubgen/test/tinyframework/R.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 0, methods: 1, attributes: 3
+  public com.android.hoststubgen.test.tinyframework.R();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=1, locals=1, args_size=1
+         x: aload_0
+         x: invokespecial #x                  // Method java/lang/Object."<init>":()V
+         x: return
+      LineNumberTable:
+      LocalVariableTable:
+        Start  Length  Slot  Name   Signature
+            0       5     0  this   Lcom/android/hoststubgen/test/tinyframework/R;
+}
+SourceFile: "R.java"
+NestMembers:
+  com/android/hoststubgen/test/tinyframework/R$Nested
+InnerClasses:
+  public static #x= #x of #x;           // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
 ## Class: com/android/hoststubgen/test/tinyframework/TinyFrameworkCallerCheck$Impl.class
   Compiled from "TinyFrameworkCallerCheck.java"
 class com.android.hoststubgen.test.tinyframework.TinyFrameworkCallerCheck$Impl
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/02-hoststubgen-test-tiny-framework-host-stub-dump.txt b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/02-hoststubgen-test-tiny-framework-host-stub-dump.txt
index c605f767f527..906a81cf45e3 100644
--- a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/02-hoststubgen-test-tiny-framework-host-stub-dump.txt
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/02-hoststubgen-test-tiny-framework-host-stub-dump.txt
@@ -122,6 +122,100 @@ RuntimeVisibleAnnotations:
 NestMembers:
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub$Proxy
+## Class: com/android/hoststubgen/test/tinyframework/R$Nested.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R$Nested
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R$Nested
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 1, methods: 2, attributes: 4
+  public static int[] ARRAY;
+    descriptor: [I
+    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  public com.android.hoststubgen.test.tinyframework.R$Nested();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=3, locals=1, args_size=1
+         x: new           #x                 // class java/lang/RuntimeException
+         x: dup
+         x: ldc           #x                 // String Stub!
+         x: invokespecial #x                 // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
+         x: athrow
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  static {};
+    descriptor: ()V
+    flags: (0x0008) ACC_STATIC
+    Code:
+      stack=3, locals=0, args_size=0
+         x: new           #x                 // class java/lang/RuntimeException
+         x: dup
+         x: ldc           #x                 // String Stub!
+         x: invokespecial #x                 // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
+         x: athrow
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;            // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestHost: class com/android/hoststubgen/test/tinyframework/R
+## Class: com/android/hoststubgen/test/tinyframework/R.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 0, methods: 1, attributes: 4
+  public com.android.hoststubgen.test.tinyframework.R();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=3, locals=1, args_size=1
+         x: new           #x                 // class java/lang/RuntimeException
+         x: dup
+         x: ldc           #x                 // String Stub!
+         x: invokespecial #x                 // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
+         x: athrow
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;            // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestMembers:
+  com/android/hoststubgen/test/tinyframework/R$Nested
 ## Class: com/android/hoststubgen/test/tinyframework/TinyFrameworkCallerCheck$Impl.class
   Compiled from "TinyFrameworkCallerCheck.java"
 class com.android.hoststubgen.test.tinyframework.TinyFrameworkCallerCheck$Impl
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/03-hoststubgen-test-tiny-framework-host-impl-dump.txt b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/03-hoststubgen-test-tiny-framework-host-impl-dump.txt
index 11d5939b7917..10bc91da2544 100644
--- a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/03-hoststubgen-test-tiny-framework-host-impl-dump.txt
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/03-hoststubgen-test-tiny-framework-host-impl-dump.txt
@@ -348,6 +348,108 @@ RuntimeVisibleAnnotations:
 NestMembers:
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub$Proxy
+## Class: com/android/hoststubgen/test/tinyframework/R$Nested.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R$Nested
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R$Nested
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 1, methods: 2, attributes: 4
+  public static int[] ARRAY;
+    descriptor: [I
+    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  public com.android.hoststubgen.test.tinyframework.R$Nested();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=1, locals=1, args_size=1
+         x: aload_0
+         x: invokespecial #x                 // Method java/lang/Object."<init>":()V
+         x: return
+      LineNumberTable:
+      LocalVariableTable:
+        Start  Length  Slot  Name   Signature
+            0       5     0  this   Lcom/android/hoststubgen/test/tinyframework/R$Nested;
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  static {};
+    descriptor: ()V
+    flags: (0x0008) ACC_STATIC
+    Code:
+      stack=4, locals=0, args_size=0
+         x: iconst_1
+         x: newarray       int
+         x: dup
+         x: iconst_0
+         x: iconst_1
+         x: iastore
+         x: putstatic     #x                 // Field ARRAY:[I
+        x: return
+      LineNumberTable:
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;            // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestHost: class com/android/hoststubgen/test/tinyframework/R
+## Class: com/android/hoststubgen/test/tinyframework/R.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 0, methods: 1, attributes: 4
+  public com.android.hoststubgen.test.tinyframework.R();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=1, locals=1, args_size=1
+         x: aload_0
+         x: invokespecial #x                 // Method java/lang/Object."<init>":()V
+         x: return
+      LineNumberTable:
+      LocalVariableTable:
+        Start  Length  Slot  Name   Signature
+            0       5     0  this   Lcom/android/hoststubgen/test/tinyframework/R;
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;            // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestMembers:
+  com/android/hoststubgen/test/tinyframework/R$Nested
 ## Class: com/android/hoststubgen/test/tinyframework/TinyFrameworkCallerCheck$Impl.class
   Compiled from "TinyFrameworkCallerCheck.java"
 class com.android.hoststubgen.test.tinyframework.TinyFrameworkCallerCheck$Impl
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/12-hoststubgen-test-tiny-framework-host-ext-stub-dump.txt b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/12-hoststubgen-test-tiny-framework-host-ext-stub-dump.txt
index c605f767f527..906a81cf45e3 100644
--- a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/12-hoststubgen-test-tiny-framework-host-ext-stub-dump.txt
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/12-hoststubgen-test-tiny-framework-host-ext-stub-dump.txt
@@ -122,6 +122,100 @@ RuntimeVisibleAnnotations:
 NestMembers:
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub$Proxy
+## Class: com/android/hoststubgen/test/tinyframework/R$Nested.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R$Nested
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R$Nested
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 1, methods: 2, attributes: 4
+  public static int[] ARRAY;
+    descriptor: [I
+    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  public com.android.hoststubgen.test.tinyframework.R$Nested();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=3, locals=1, args_size=1
+         x: new           #x                 // class java/lang/RuntimeException
+         x: dup
+         x: ldc           #x                 // String Stub!
+         x: invokespecial #x                 // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
+         x: athrow
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  static {};
+    descriptor: ()V
+    flags: (0x0008) ACC_STATIC
+    Code:
+      stack=3, locals=0, args_size=0
+         x: new           #x                 // class java/lang/RuntimeException
+         x: dup
+         x: ldc           #x                 // String Stub!
+         x: invokespecial #x                 // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
+         x: athrow
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;            // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestHost: class com/android/hoststubgen/test/tinyframework/R
+## Class: com/android/hoststubgen/test/tinyframework/R.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 0, methods: 1, attributes: 4
+  public com.android.hoststubgen.test.tinyframework.R();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=3, locals=1, args_size=1
+         x: new           #x                 // class java/lang/RuntimeException
+         x: dup
+         x: ldc           #x                 // String Stub!
+         x: invokespecial #x                 // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
+         x: athrow
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;            // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestMembers:
+  com/android/hoststubgen/test/tinyframework/R$Nested
 ## Class: com/android/hoststubgen/test/tinyframework/TinyFrameworkCallerCheck$Impl.class
   Compiled from "TinyFrameworkCallerCheck.java"
 class com.android.hoststubgen.test.tinyframework.TinyFrameworkCallerCheck$Impl
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/13-hoststubgen-test-tiny-framework-host-ext-impl-dump.txt b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/13-hoststubgen-test-tiny-framework-host-ext-impl-dump.txt
index 088bc80e11c5..fcf9a8c663ad 100644
--- a/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/13-hoststubgen-test-tiny-framework-host-ext-impl-dump.txt
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/golden-output/13-hoststubgen-test-tiny-framework-host-ext-impl-dump.txt
@@ -481,6 +481,136 @@ RuntimeVisibleAnnotations:
 NestMembers:
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub
   com/android/hoststubgen/test/tinyframework/IPretendingAidl$Stub$Proxy
+## Class: com/android/hoststubgen/test/tinyframework/R$Nested.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R$Nested
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R$Nested
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 1, methods: 2, attributes: 4
+  public static int[] ARRAY;
+    descriptor: [I
+    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  public com.android.hoststubgen.test.tinyframework.R$Nested();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=4, locals=1, args_size=1
+         x: ldc           #x                  // class com/android/hoststubgen/test/tinyframework/R$Nested
+         x: ldc           #x                 // String <init>
+         x: ldc           #x                 // String ()V
+         x: ldc           #x                 // String com.android.hoststubgen.hosthelper.HostTestUtils.logMethodCall
+         x: invokestatic  #x                 // Method com/android/hoststubgen/hosthelper/HostTestUtils.callMethodCallHook:(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
+        x: aload_0
+        x: invokespecial #x                 // Method java/lang/Object."<init>":()V
+        x: return
+      LineNumberTable:
+      LocalVariableTable:
+        Start  Length  Slot  Name   Signature
+           11       5     0  this   Lcom/android/hoststubgen/test/tinyframework/R$Nested;
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+
+  static {};
+    descriptor: ()V
+    flags: (0x0008) ACC_STATIC
+    Code:
+      stack=4, locals=0, args_size=0
+         x: ldc           #x                  // class com/android/hoststubgen/test/tinyframework/R$Nested
+         x: ldc           #x                 // String <clinit>
+         x: ldc           #x                 // String ()V
+         x: ldc           #x                 // String com.android.hoststubgen.hosthelper.HostTestUtils.logMethodCall
+         x: invokestatic  #x                 // Method com/android/hoststubgen/hosthelper/HostTestUtils.callMethodCallHook:(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
+        x: ldc           #x                  // class com/android/hoststubgen/test/tinyframework/R$Nested
+        x: ldc           #x                 // String com.android.hoststubgen.hosthelper.HostTestUtils.logClassLoaded
+        x: invokestatic  #x                 // Method com/android/hoststubgen/hosthelper/HostTestUtils.onClassLoaded:(Ljava/lang/Class;Ljava/lang/String;)V
+        x: iconst_1
+        x: newarray       int
+        x: dup
+        x: iconst_0
+        x: iconst_1
+        x: iastore
+        x: putstatic     #x                 // Field ARRAY:[I
+        x: return
+      LineNumberTable:
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;            // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestHost: class com/android/hoststubgen/test/tinyframework/R
+## Class: com/android/hoststubgen/test/tinyframework/R.class
+  Compiled from "R.java"
+public class com.android.hoststubgen.test.tinyframework.R
+  minor version: 0
+  major version: 61
+  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
+  this_class: #x                          // com/android/hoststubgen/test/tinyframework/R
+  super_class: #x                         // java/lang/Object
+  interfaces: 0, fields: 0, methods: 2, attributes: 4
+  private static {};
+    descriptor: ()V
+    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
+    Code:
+      stack=2, locals=0, args_size=0
+         x: ldc           #x                  // class com/android/hoststubgen/test/tinyframework/R
+         x: ldc           #x                 // String com.android.hoststubgen.hosthelper.HostTestUtils.logClassLoaded
+         x: invokestatic  #x                 // Method com/android/hoststubgen/hosthelper/HostTestUtils.onClassLoaded:(Ljava/lang/Class;Ljava/lang/String;)V
+         x: return
+
+  public com.android.hoststubgen.test.tinyframework.R();
+    descriptor: ()V
+    flags: (0x0001) ACC_PUBLIC
+    Code:
+      stack=4, locals=1, args_size=1
+         x: ldc           #x                  // class com/android/hoststubgen/test/tinyframework/R
+         x: ldc           #x                 // String <init>
+         x: ldc           #x                 // String ()V
+         x: ldc           #x                 // String com.android.hoststubgen.hosthelper.HostTestUtils.logMethodCall
+         x: invokestatic  #x                 // Method com/android/hoststubgen/hosthelper/HostTestUtils.callMethodCallHook:(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
+        x: aload_0
+        x: invokespecial #x                 // Method java/lang/Object."<init>":()V
+        x: return
+      LineNumberTable:
+      LocalVariableTable:
+        Start  Length  Slot  Name   Signature
+           11       5     0  this   Lcom/android/hoststubgen/test/tinyframework/R;
+    RuntimeVisibleAnnotations:
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+      x: #x()
+        com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+}
+InnerClasses:
+  public static #x= #x of #x;           // Nested=class com/android/hoststubgen/test/tinyframework/R$Nested of class com/android/hoststubgen/test/tinyframework/R
+SourceFile: "R.java"
+RuntimeVisibleAnnotations:
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInStub
+  x: #x()
+    com.android.hoststubgen.hosthelper.HostStubGenKeptInImpl
+NestMembers:
+  com/android/hoststubgen/test/tinyframework/R$Nested
 ## Class: com/android/hoststubgen/test/tinyframework/TinyFrameworkCallerCheck$Impl.class
   Compiled from "TinyFrameworkCallerCheck.java"
 class com.android.hoststubgen.test.tinyframework.TinyFrameworkCallerCheck$Impl
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/policy-override-tiny-framework.txt b/tools/hoststubgen/hoststubgen/test-tiny-framework/policy-override-tiny-framework.txt
index d30208452a40..696b6d009dc2 100644
--- a/tools/hoststubgen/hoststubgen/test-tiny-framework/policy-override-tiny-framework.txt
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/policy-override-tiny-framework.txt
@@ -19,6 +19,9 @@ class com/android/hoststubgen/test/tinyframework/TinyFrameworkForTextPolicy	~com
 # Heuristics rule: Stub all the AIDL classes.
 class :aidl stubclass
 
+# Heuristics rule: Stub all the R classes.
+class :r stubclass
+
 # Default is "remove", so let's put all the base classes / interfaces in the stub first.
 class com.android.hoststubgen.test.tinyframework.subclasstest.C1 stub
 class com.android.hoststubgen.test.tinyframework.subclasstest.C2 stub
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/tiny-framework/src/com/android/hoststubgen/test/tinyframework/R.java b/tools/hoststubgen/hoststubgen/test-tiny-framework/tiny-framework/src/com/android/hoststubgen/test/tinyframework/R.java
new file mode 100644
index 000000000000..b1bedf4b6853
--- /dev/null
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/tiny-framework/src/com/android/hoststubgen/test/tinyframework/R.java
@@ -0,0 +1,22 @@
+/*
+ * 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.
+ */
+package com.android.hoststubgen.test.tinyframework;
+
+public class R {
+    public static class Nested {
+        public static int[] ARRAY = new int[] {1};
+    }
+}
diff --git a/tools/hoststubgen/hoststubgen/test-tiny-framework/tiny-test/src/com/android/hoststubgen/test/tinyframework/TinyFrameworkClassTest.java b/tools/hoststubgen/hoststubgen/test-tiny-framework/tiny-test/src/com/android/hoststubgen/test/tinyframework/TinyFrameworkClassTest.java
index 762180dcf74b..37925e82bdb6 100644
--- a/tools/hoststubgen/hoststubgen/test-tiny-framework/tiny-test/src/com/android/hoststubgen/test/tinyframework/TinyFrameworkClassTest.java
+++ b/tools/hoststubgen/hoststubgen/test-tiny-framework/tiny-test/src/com/android/hoststubgen/test/tinyframework/TinyFrameworkClassTest.java
@@ -19,6 +19,7 @@ import static com.google.common.truth.Truth.assertThat;
 
 import static org.junit.Assert.fail;
 
+import com.android.hoststubgen.test.tinyframework.R.Nested;
 import com.android.hoststubgen.test.tinyframework.TinyFrameworkNestedClasses.SubClass;
 
 import org.junit.Rule;
@@ -328,4 +329,9 @@ public class TinyFrameworkClassTest {
         assertThat(IPretendingAidl.Stub.addOne(1)).isEqualTo(2);
         assertThat(IPretendingAidl.Stub.Proxy.addTwo(1)).isEqualTo(3);
     }
+
+    @Test
+    public void testRFileHeuristics() {
+        assertThat(Nested.ARRAY.length).isEqualTo(1);
+    }
 }