Tool that scans a given Jar for references to select classes and outputs corresponding Proguard-style -keep rules

RELNOTES: None.

PiperOrigin-RevId: 186372769
GitOrigin-RevId: c1042f2adc55d040495a1159100146fad607d32a
Change-Id: I8c3509e9d48145cc90faa143016c3f2cb0d23c27

4 files changed, 182 insertions, 0 deletions

diff --git a/test/java/com/google/devtools/build/android/desugar/scan/test_keep_scanner.sh b/test/java/com/google/devtools/build/android/desugar/scan/test_keep_scanner.sh
new file mode 100755
index 0000000..d42859f
--- /dev/null
+++ b/test/java/com/google/devtools/build/android/desugar/scan/test_keep_scanner.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+#
+# Copyright 2018 The Bazel Authors. All rights reserved.
+#
+# 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.
+set -eux
+
+out=$(mktemp)
+"$1" --input "$2" --keep_file "${out}" --prefix java/
+
+if ! diff "$3" "${out}"; then
+  echo "Unexpected output"
+  cat "${out}"
+  rm "${out}"
+  exit 1
+fi
+rm "${out}"
diff --git a/test/java/com/google/devtools/build/android/desugar/scan/testdata/CollectionReferences.java b/test/java/com/google/devtools/build/android/desugar/scan/testdata/CollectionReferences.java
new file mode 100644
index 0000000..482c32a
--- /dev/null
+++ b/test/java/com/google/devtools/build/android/desugar/scan/testdata/CollectionReferences.java
@@ -0,0 +1,60 @@
+// Copyright 2018 The Bazel Authors. All rights reserved.
+//
+// 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.google.devtools.build.android.desugar.scan.testdata;
+
+import java.util.AbstractList;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+
+/** Test data for {@code KeepScanner} with references to java.* */
+public class CollectionReferences {
+
+  private final List<Date> dates;
+
+  public CollectionReferences() {
+    dates = new ArrayList<>(7);
+    assert !(dates instanceof LinkedList);
+  }
+
+  @SuppressWarnings("unchecked")
+  public void add(Date date) {
+    List<Date> l = (AbstractList<Date>) Collection.class.cast(dates);
+    l.add(date);
+  }
+
+  public Date first() {
+    try {
+      return dates.get(0);
+    } catch (IndexOutOfBoundsException e) {
+      return null;
+    }
+  }
+
+  public long min() {
+    long result = Long.MAX_VALUE; // compile-time constant, no ref
+    for (Date d : dates) {
+      if (d.getTime() < result) {
+        result = d.getTime();
+      }
+    }
+    return result;
+  }
+
+  static {
+    System.out.println("Hello!");
+  }
+}
diff --git a/test/java/com/google/devtools/build/android/desugar/scan/testdata/OverlappingCollectionReferences.java b/test/java/com/google/devtools/build/android/desugar/scan/testdata/OverlappingCollectionReferences.java
new file mode 100644
index 0000000..e743a0d
--- /dev/null
+++ b/test/java/com/google/devtools/build/android/desugar/scan/testdata/OverlappingCollectionReferences.java
@@ -0,0 +1,49 @@
+// Copyright 2018 The Bazel Authors. All rights reserved.
+//
+// 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.google.devtools.build.android.desugar.scan.testdata;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+/** Supplements {@link CollectionReferences} with additional and overlapping references to java.* */
+public class OverlappingCollectionReferences {
+
+  private final ArrayList<Date> dates;
+
+  public OverlappingCollectionReferences() {
+    dates = new ArrayList<>();
+  }
+
+  public void add(Date date) {
+    dates.add(date);
+  }
+
+  public Date first() {
+    try {
+      return dates.get(0);
+    } catch (IndexOutOfBoundsException e) {
+      return null;
+    }
+  }
+
+  public Date max() {
+    long result = Long.MIN_VALUE; // compile-time constant, no ref
+    for (Date d : dates) {
+      if (d.getTime() > result) {
+        result = d.getTime();
+      }
+    }
+    return new Date(result);
+  }
+}
diff --git a/test/java/com/google/devtools/build/android/desugar/scan/testdata_golden.txt b/test/java/com/google/devtools/build/android/desugar/scan/testdata_golden.txt
new file mode 100644
index 0000000..e4509b4
--- /dev/null
+++ b/test/java/com/google/devtools/build/android/desugar/scan/testdata_golden.txt
@@ -0,0 +1,46 @@
+-keep class java.io.PrintStream {
+  *** println(java.lang.String);
+}
+-keep class java.lang.AssertionError {
+  *** <init>();
+}
+-keep class java.lang.Class {
+  *** cast(java.lang.Object);
+  *** desiredAssertionStatus();
+}
+-keep class java.lang.IndexOutOfBoundsException {
+}
+-keep class java.lang.Object {
+  *** <init>();
+}
+-keep class java.lang.String {
+}
+-keep class java.lang.System {
+  *** out;
+}
+-keep class java.util.AbstractList {
+}
+-keep class java.util.ArrayList {
+  *** <init>();
+  *** <init>(int);
+  *** add(java.lang.Object);
+  *** get(int);
+  *** iterator();
+}
+-keep class java.util.Collection {
+}
+-keep class java.util.Date {
+  *** <init>(long);
+  *** getTime();
+}
+-keep class java.util.Iterator {
+  *** hasNext();
+  *** next();
+}
+-keep class java.util.LinkedList {
+}
+-keep class java.util.List {
+  *** add(java.lang.Object);
+  *** get(int);
+  *** iterator();
+}