Const finder fixes (#15880)

tools/const_finder/bin/main.dart

@@ -43,10 +43,6 @@ void main(List<String> args) {
         valueHelp: 'path/to/main.dill',
         help: 'The path to a kernel file to parse, which was created from the '
             'main-package-uri library.')
-    ..addOption('main-library-uri',
-        help: 'The package: URI to treat as the main entrypoint library '
-            '(the same package used to create the kernel-file).',
-        valueHelp: 'package:hello_world/main.dart')
     ..addOption('class-library-uri',
         help: 'The package: URI of the class to find.',
         valueHelp: 'package:flutter/src/widgets/icon_data.dart')
@@ -73,7 +69,6 @@ void main(List<String> args) {
 
   final ConstFinder finder = ConstFinder(
     kernelFilePath: getArg<String>('kernel-file'),
-    targetLibraryUri: getArg<String>('main-library-uri'),
     classLibraryUri: getArg<String>('class-library-uri'),
     className: getArg<String>('class-name'),
   );

tools/const_finder/lib/const_finder.dart

@@ -8,28 +8,25 @@ import 'package:meta/meta.dart';
 class _ConstVisitor extends RecursiveVisitor<void> {
   _ConstVisitor(
     this.kernelFilePath,
-    this.targetLibraryUri,
     this.classLibraryUri,
     this.className,
   )  : assert(kernelFilePath != null),
-        assert(targetLibraryUri != null),
         assert(classLibraryUri != null),
         assert(className != null),
+        _visitedInstnaces = <String>{},
         constantInstances = <Map<String, dynamic>>[],
         nonConstantLocations = <Map<String, dynamic>>[];
 
   /// The path to the file to open.
   final String kernelFilePath;
 
-  /// The library URI for the main entrypoint of the target library.
-  final String targetLibraryUri;
-
   /// The library URI for the class to find.
   final String classLibraryUri;
 
   /// The name of the class to find.
   final String className;
 
+  final Set<String> _visitedInstnaces;
   final List<Map<String, dynamic>> constantInstances;
   final List<Map<String, dynamic>> nonConstantLocations;
 
@@ -43,6 +40,7 @@ class _ConstVisitor extends RecursiveVisitor<void> {
     final Class parentClass = node.target.parent as Class;
     if (!_matches(parentClass)) {
       super.visitConstructorInvocation(node);
+      return;
     }
     nonConstantLocations.add(<String, dynamic>{
       'file': node.location.file.toString(),
@@ -53,15 +51,22 @@ class _ConstVisitor extends RecursiveVisitor<void> {
 
   @override
   void visitInstanceConstantReference(InstanceConstant node) {
+    node.fieldValues.values.whereType<InstanceConstant>().forEach(visitInstanceConstantReference);
     if (!_matches(node.classNode)) {
+      super.visitInstanceConstantReference(node);
       return;
     }
     final Map<String, dynamic> instance = <String, dynamic>{};
     for (MapEntry<Reference, Constant> kvp in node.fieldValues.entries) {
+      if (kvp.value is! PrimitiveConstant<dynamic>) {
+        continue;
+      }
       final PrimitiveConstant<dynamic> value = kvp.value as PrimitiveConstant<dynamic>;
       instance[kvp.key.canonicalName.name] = value.value;
     }
-    constantInstances.add(instance);
+    if (_visitedInstnaces.add(instance.toString())) {
+      constantInstances.add(instance);
+    }
   }
 }
 
@@ -71,53 +76,27 @@ class ConstFinder {
   /// be null.
   ///
   /// The `kernelFilePath` is the path to a dill (kernel) file to process.
-  ///
-  /// The `targetLibraryUri` is the `package:` URI of the main entrypoint to
-  /// search from.
-  ///
-  ///
-  ///
   ConstFinder({
     @required String kernelFilePath,
-    @required String targetLibraryUri,
     @required String classLibraryUri,
     @required String className,
   })  : _visitor = _ConstVisitor(
                     kernelFilePath,
-                    targetLibraryUri,
                     classLibraryUri,
                     className,
                   );
 
   final _ConstVisitor _visitor;
 
-  Library _getRoot() {
-    final Component binary = loadComponentFromBinary(_visitor.kernelFilePath);
-    return binary.libraries.firstWhere(
-      (Library library) => library.canonicalName.name == _visitor.targetLibraryUri,
-      orElse: () => throw LibraryNotFoundException._(_visitor.targetLibraryUri),
-    );
-  }
-
   /// Finds all instances
   Map<String, dynamic> findInstances() {
-    final Library root = _getRoot();
-    root.visitChildren(_visitor);
+    _visitor._visitedInstnaces.clear();
+    for (Library library in loadComponentFromBinary(_visitor.kernelFilePath).libraries) {
+      library.visitChildren(_visitor);
+    }
     return <String, dynamic>{
       'constantInstances': _visitor.constantInstances,
       'nonConstantLocations': _visitor.nonConstantLocations,
     };
   }
 }
-
-/// Exception thrown by [ConstFinder.findInstances] when the target library
-/// is not found.
-class LibraryNotFoundException implements Exception {
-  const LibraryNotFoundException._(this.targetLibraryUri);
-
-  /// The library target URI that could not be found.
-  final String targetLibraryUri;
-
-  @override
-  String toString() => 'Could not find target library for "$targetLibraryUri".';
-}

tools/const_finder/test/const_finder_test.dart

@@ -34,7 +34,6 @@ void _checkConsts() {
   print('Checking for expected constants.');
   final ConstFinder finder = ConstFinder(
     kernelFilePath: constsDill,
-    targetLibraryUri: 'package:const_finder_fixtures/consts.dart',
     classLibraryUri: 'package:const_finder_fixtures/target.dart',
     className: 'Target',
   );
@@ -43,8 +42,15 @@ void _checkConsts() {
     jsonEncode(finder.findInstances()),
     jsonEncode(<String, dynamic>{
       'constantInstances': <Map<String, dynamic>>[
-        <String, dynamic>{'stringValue': '1', 'intValue': 1},
-        <String, dynamic>{'stringValue': '2', 'intValue': 2}
+        <String, dynamic>{'stringValue': '1', 'intValue': 1, 'targetValue': null},
+        <String, dynamic>{'stringValue': '4', 'intValue': 4, 'targetValue': null},
+        <String, dynamic>{'stringValue': '2', 'intValue': 2},
+        <String, dynamic>{'stringValue': '6', 'intValue': 6, 'targetValue': null},
+        <String, dynamic>{'stringValue': '8', 'intValue': 8, 'targetValue': null},
+        <String, dynamic>{'stringValue': '10', 'intValue': 10, 'targetValue': null},
+        <String, dynamic>{'stringValue': '9', 'intValue': 9},
+        <String, dynamic>{'stringValue': '7', 'intValue': 7, 'targetValue': null},
+        <String, dynamic>{'stringValue': 'package', 'intValue':-1, 'targetValue': null},
       ],
       'nonConstantLocations': <dynamic>[],
     }),
@@ -55,7 +61,6 @@ void _checkNonConsts() {
   print('Checking for non-constant instances.');
   final ConstFinder finder = ConstFinder(
     kernelFilePath: constsAndNonDill,
-    targetLibraryUri: 'package:const_finder_fixtures/consts_and_non.dart',
     classLibraryUri: 'package:const_finder_fixtures/target.dart',
     className: 'Target',
   );
@@ -64,19 +69,34 @@ void _checkNonConsts() {
     jsonEncode(finder.findInstances()),
     jsonEncode(<String, dynamic>{
       'constantInstances': <dynamic>[
-        <String, dynamic>{'stringValue': '1', 'intValue': 1}
+        <String, dynamic>{'stringValue': '1', 'intValue': 1, 'targetValue': null},
+        <String, dynamic>{'stringValue': '6', 'intValue': 6, 'targetValue': null},
+        <String, dynamic>{'stringValue': '8', 'intValue': 8, 'targetValue': null},
+        <String, dynamic>{'stringValue': '10', 'intValue': 10, 'targetValue': null},
+        <String, dynamic>{'stringValue': '9', 'intValue': 9},
+        <String, dynamic>{'stringValue': '7', 'intValue': 7, 'targetValue': null},
       ],
       'nonConstantLocations': <dynamic>[
         <String, dynamic>{
           'file': 'file://$fixtures/lib/consts_and_non.dart',
-          'line': 12,
-          'column': 26
+          'line': 14,
+          'column': 26,
         },
         <String, dynamic>{
           'file': 'file://$fixtures/lib/consts_and_non.dart',
-          'line': 14,
-          'column': 26
+          'line': 17,
+          'column': 26,
+        },
+        <String, dynamic>{
+          'file': 'file://$fixtures/lib/consts_and_non.dart',
+          'line': 19,
+          'column': 26,
         },
+        <String, dynamic>{
+          'file': 'file://$fixtures/pkg/package.dart',
+          'line': 10,
+          'column': 25,
+        }
       ]
     }),
   );

tools/const_finder/test/fixtures/.packages

 # Generated by pub on 2020-01-15 10:08:29.776333.
 const_finder_fixtures:lib/
+const_finder_fixtures_package:pkg/
\ No newline at end of file

tools/const_finder/test/fixtures/lib/consts.dart

@@ -4,14 +4,38 @@
 
 import 'dart:core';
 
+import 'package:const_finder_fixtures_package/package.dart';
+
 import 'target.dart';
 
 void main() {
-  const Target target1 = Target('1', 1);
-  const Target target2 = Target('2', 2);
+  const Target target1 = Target('1', 1, null);
+  const Target target2 = Target('2', 2, Target('4', 4, null));
   // ignore: unused_local_variable
-  const Target target3 = Target('3', 3); // should be tree shaken out.
+  const Target target3 = Target('3', 3, Target('5', 5, null)); // should be tree shaken out.
   target1.hit();
   target2.hit();
+
+  blah(const Target('6', 6, null));
+
+  const IgnoreMe ignoreMe = IgnoreMe(Target('7', 7, null)); // IgnoreMe is ignored but 7 is not.
+  // ignore: prefer_const_constructors
+  final IgnoreMe ignoreMe2 = IgnoreMe(const Target('8', 8, null));
+  // ignore: prefer_const_constructors
+  final IgnoreMe ignoreMe3 = IgnoreMe(const Target('9', 9, Target('10', 10, null)));
+  print(ignoreMe);
+  print(ignoreMe2);
+  print(ignoreMe3);
+
+  createTargetInPackage();
 }
 
+class IgnoreMe {
+  const IgnoreMe([this.target]);
+
+  final Target target;
+}
+
+void blah(Target target) {
+  print(target);
+}

tools/const_finder/test/fixtures/lib/consts_and_non.dart

@@ -5,13 +5,41 @@
 // ignore_for_file: prefer_const_constructors
 import 'dart:core';
 
+import 'package:const_finder_fixtures_package/package.dart';
+
 import 'target.dart';
 
 void main() {
-  const Target target1 = Target('1', 1);
-  final Target target2 = Target('2', 2);
+  const Target target1 = Target('1', 1, null);
+  final Target target2 = Target('2', 2, const Target('4', 4, null));
+
+  // ignore: unused_local_variable
+  final Target target3 = Target('3', 3, Target('5', 5, null)); // should be tree shaken out.
   // ignore: unused_local_variable
-  final Target target3 = Target('3', 3); // should be tree shaken out.
+  final Target target6 = Target('6', 6, null); // should be tree shaken out.
   target1.hit();
   target2.hit();
+
+  blah(const Target('6', 6, null));
+
+  const IgnoreMe ignoreMe = IgnoreMe(Target('7', 7, null)); // IgnoreMe is ignored but 7 is not.
+  // ignore: prefer_const_constructors
+  final IgnoreMe ignoreMe2 = IgnoreMe(const Target('8', 8, null));
+  // ignore: prefer_const_constructors
+  final IgnoreMe ignoreMe3 = IgnoreMe(const Target('9', 9, Target('10', 10, null)));
+  print(ignoreMe);
+  print(ignoreMe2);
+  print(ignoreMe3);
+
+  createNonConstTargetInPackage();
+}
+
+class IgnoreMe {
+  const IgnoreMe([this.target]);
+
+  final Target target;
+}
+
+void blah(Target target) {
+  print(target);
 }

tools/const_finder/test/fixtures/lib/target.dart

@@ -3,10 +3,11 @@
 // found in the LICENSE file.
 
 class Target {
-  const Target(this.stringValue, this.intValue);
+  const Target(this.stringValue, this.intValue, this.targetValue);
 
   final String stringValue;
   final int intValue;
+  final Target targetValue;
 
   void hit() {
     print('$stringValue $intValue');

tools/const_finder/test/fixtures/pkg/package.dart

+import 'package:const_finder_fixtures/target.dart';
+
+void createTargetInPackage() {
+  const Target target = Target('package', -1, null);
+  target.hit();
+}
+
+void createNonConstTargetInPackage() {
+  // ignore: prefer_const_constructors
+  final Target target = Target('package_non', -2, null);
+  target.hit();
+}