packages/flutter_tools/lib/src/base/analyze_size.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'package:archive/archive.dart';
 import 'package:archive/archive_io.dart';
 import 'package:meta/meta.dart';
 import 'package:vm_snapshot_analysis/treemap.dart';

 import '../convert.dart';
 import '../reporting/reporting.dart';
 import 'common.dart';
 import 'file_system.dart';
 import 'logger.dart';
 import 'terminal.dart';

 /// A class to analyze APK and AOT snapshot and generate a breakdown of the data.
 class SizeAnalyzer {
   SizeAnalyzer({
     required FileSystem fileSystem,
     required Logger logger,
     required Usage flutterUsage,
     Pattern appFilenamePattern = 'libapp.so',
   }) : _flutterUsage = flutterUsage,
        _fileSystem = fileSystem,
        _logger = logger,
        _appFilenamePattern = appFilenamePattern;

   final FileSystem _fileSystem;
   final Logger _logger;
   final Pattern _appFilenamePattern;
   final Usage _flutterUsage;
   String? _appFilename;

   static const String aotSnapshotFileName = 'aot-snapshot.json';
   static const int tableWidth = 80;
   static const int _kAotSizeMaxDepth = 2;
   static const int _kZipSizeMaxDepth = 1;

   /// Analyze the [aotSnapshot] in an uncompressed output directory.
   Future<Map<String, Object?>> analyzeAotSnapshot({
     required Directory outputDirectory,
     required File aotSnapshot,
     required File precompilerTrace,
     required String type,
     String? excludePath,
   }) async {
     _logger.printStatus('▒' * tableWidth);
     _logger.printStatus('━' * tableWidth);
     final _SymbolNode aotAnalysisJson = _parseDirectory(
       outputDirectory,
       outputDirectory.parent.path,
       excludePath,
     );

     // Convert an AOT snapshot file into a map.
     final Object? decodedAotSnapshot = json.decode(aotSnapshot.readAsStringSync());
     if (decodedAotSnapshot == null) {
       throwToolExit('AOT snapshot is invalid for analysis');
     }
     final Map<String, Object?> processedAotSnapshotJson = treemapFromJson(decodedAotSnapshot);
     final _SymbolNode? aotSnapshotJsonRoot = _parseAotSnapshot(processedAotSnapshotJson);

     for (final _SymbolNode firstLevelPath in aotAnalysisJson.children) {
       _printEntitySize(
         firstLevelPath.name,
         byteSize: firstLevelPath.byteSize,
         level: 1,
       );
       // Print the expansion of lib directory to show more info for `appFilename`.
       if (firstLevelPath.name == _fileSystem.path.basename(outputDirectory.path) && aotSnapshotJsonRoot != null) {
         _printLibChildrenPaths(firstLevelPath, '', aotSnapshotJsonRoot, _kAotSizeMaxDepth, 0);
       }
     }

     _logger.printStatus('▒' * tableWidth);

     Map<String, Object?> apkAnalysisJson = aotAnalysisJson.toJson();

     apkAnalysisJson['type'] = type; // one of apk, aab, ios, macos, windows, or linux.

     apkAnalysisJson = _addAotSnapshotDataToAnalysis(
       apkAnalysisJson: apkAnalysisJson,
       path: _locatedAotFilePath,
       aotSnapshotJson: processedAotSnapshotJson,
       precompilerTrace: json.decode(precompilerTrace.readAsStringSync()) as Map<String, Object?>? ?? <String, Object?>{},
     );

     assert(_appFilename != null);
     CodeSizeEvent(type, flutterUsage: _flutterUsage).send();
     return apkAnalysisJson;
   }

   /// Analyzes [apk] and [aotSnapshot] to output a [Map] object that includes
   /// the breakdown of the both files, where the breakdown of [aotSnapshot] is placed
   /// under 'lib/arm64-v8a/$_appFilename'.
   ///
   /// [kind] must be one of 'apk' or 'aab'.
   /// The [aotSnapshot] can be either instruction sizes snapshot or a v8 snapshot.
   Future<Map<String, Object?>> analyzeZipSizeAndAotSnapshot({
     required File zipFile,
     required File aotSnapshot,
     required File precompilerTrace,
     required String kind,
   }) async {
     assert(kind == 'apk' || kind == 'aab');
     _logger.printStatus('▒' * tableWidth);
     _printEntitySize(
       '${zipFile.basename} (total compressed)',
       byteSize: zipFile.lengthSync(),
       level: 0,
       showColor: false,
     );
     _logger.printStatus('━' * tableWidth);

     final _SymbolNode apkAnalysisRoot = _parseUnzipFile(zipFile);

     // Convert an AOT snapshot file into a map.
     final Object? decodedAotSnapshot = json.decode(aotSnapshot.readAsStringSync());
     if (decodedAotSnapshot == null) {
       throwToolExit('AOT snapshot is invalid for analysis');
     }
     final Map<String, Object?> processedAotSnapshotJson = treemapFromJson(decodedAotSnapshot);
     final _SymbolNode? aotSnapshotJsonRoot = _parseAotSnapshot(processedAotSnapshotJson);
     if (aotSnapshotJsonRoot != null) {
       for (final _SymbolNode firstLevelPath in apkAnalysisRoot.children) {
         _printLibChildrenPaths(firstLevelPath, '', aotSnapshotJsonRoot, _kZipSizeMaxDepth, 0);
       }
     }
     _logger.printStatus('▒' * tableWidth);

     Map<String, Object?> apkAnalysisJson = apkAnalysisRoot.toJson();

     apkAnalysisJson['type'] = kind;

     assert(_appFilename != null);
     apkAnalysisJson = _addAotSnapshotDataToAnalysis(
       apkAnalysisJson: apkAnalysisJson,
       path: _locatedAotFilePath,
       aotSnapshotJson: processedAotSnapshotJson,
       precompilerTrace: json.decode(precompilerTrace.readAsStringSync()) as Map<String, Object?>? ?? <String, Object?>{},
     );
     CodeSizeEvent(kind, flutterUsage: _flutterUsage).send();
     return apkAnalysisJson;
   }

   _SymbolNode _parseUnzipFile(File zipFile) {
     final Archive archive = ZipDecoder().decodeBytes(zipFile.readAsBytesSync());
     final Map<List<String>, int> pathsToSize = <List<String>, int>{};

     for (final ArchiveFile archiveFile in archive.files) {
       final InputStreamBase? rawContent = archiveFile.rawContent;
       if (rawContent != null) {
         pathsToSize[_fileSystem.path.split(archiveFile.name)] = rawContent.length;
       }
     }
     return _buildSymbolTree(pathsToSize);
   }

   _SymbolNode _parseDirectory(Directory directory, String relativeTo, String? excludePath) {
     final Map<List<String>, int> pathsToSize = <List<String>, int>{};
     for (final File file in directory.listSync(recursive: true).whereType<File>()) {
       if (excludePath != null && file.uri.pathSegments.contains(excludePath)) {
         continue;
       }
       final List<String> path = _fileSystem.path.split(
         _fileSystem.path.relative(file.path, from: relativeTo));
       pathsToSize[path] = file.lengthSync();
     }
     return _buildSymbolTree(pathsToSize);
   }

   List<String> _locatedAotFilePath = <String>[];

   List<String> _buildNodeName(_SymbolNode start, _SymbolNode? parent) {
     final List<String> results = <String>[start.name];
     while (parent != null && parent.name != 'Root') {
       results.insert(0, parent.name);
       parent = parent.parent;
     }
     return results;
   }

   _SymbolNode _buildSymbolTree(Map<List<String>, int> pathsToSize) {
      final _SymbolNode rootNode = _SymbolNode('Root');
     _SymbolNode currentNode = rootNode;

     for (final List<String> paths in pathsToSize.keys) {
       for (final String path in paths) {
         _SymbolNode? childWithPathAsName = currentNode.childByName(path);

         if (childWithPathAsName == null) {
           childWithPathAsName = _SymbolNode(path);
           if (matchesPattern(path, pattern: _appFilenamePattern) != null) {
             _appFilename = path;
             childWithPathAsName.name += ' (Dart AOT)';
             _locatedAotFilePath = _buildNodeName(childWithPathAsName, currentNode);
           } else if (path == 'libflutter.so') {
             childWithPathAsName.name += ' (Flutter Engine)';
           }
           currentNode.addChild(childWithPathAsName);
         }
         childWithPathAsName.addSize(pathsToSize[paths] ?? 0);
         currentNode = childWithPathAsName;
       }
       currentNode = rootNode;
     }
     return rootNode;
   }

   /// Prints all children paths for the lib/ directory in an APK.
   ///
   /// A brief summary of aot snapshot is printed under 'lib/arm64-v8a/$_appFilename'.
   void _printLibChildrenPaths(
     _SymbolNode currentNode,
     String totalPath,
     _SymbolNode aotSnapshotJsonRoot,
     int maxDepth,
     int currentDepth,
   ) {
     totalPath += currentNode.name;

     assert(_appFilename != null);
     if (currentNode.children.isNotEmpty
       && currentNode.name != '$_appFilename (Dart AOT)'
       && currentDepth < maxDepth
       && currentNode.byteSize >= 1000) {
       for (final _SymbolNode child in currentNode.children) {
         _printLibChildrenPaths(child, '$totalPath/', aotSnapshotJsonRoot, maxDepth, currentDepth + 1);
       }
       _leadingPaths = totalPath.split('/')
         ..removeLast();
     } else {
       // Print total path and size if currentNode does not have any children and is
       // larger than 1KB
       final bool isAotSnapshotPath = _locatedAotFilePath.join('/').contains(totalPath);
       if (currentNode.byteSize >= 1000 || isAotSnapshotPath) {
         _printEntitySize(totalPath, byteSize: currentNode.byteSize, level: 1, emphasis: currentNode.children.isNotEmpty);
         if (isAotSnapshotPath) {
           _printAotSnapshotSummary(aotSnapshotJsonRoot, level: totalPath.split('/').length);
         }
         _leadingPaths = totalPath.split('/')
           ..removeLast();
       }
     }
   }

   /// Go through the AOT gen snapshot size JSON and print out a collapsed summary
   /// for the first package level.
   void _printAotSnapshotSummary(_SymbolNode aotSnapshotRoot, {int maxDirectoriesShown = 20, required int level}) {
     _printEntitySize(
       'Dart AOT symbols accounted decompressed size',
       byteSize: aotSnapshotRoot.byteSize,
       level: level,
       emphasis: true,
     );

     final List<_SymbolNode> sortedSymbols = aotSnapshotRoot.children.toList()
       // Remove entries like  @unknown, @shared, and @stubs as well as private dart libraries
       //  which are not interpretable by end users.
       ..removeWhere((_SymbolNode node) => node.name.startsWith('@') || node.name.startsWith('dart:_'))
       ..sort((_SymbolNode a, _SymbolNode b) => b.byteSize.compareTo(a.byteSize));
     for (final _SymbolNode node in sortedSymbols.take(maxDirectoriesShown)) {
       // Node names will have an extra leading `package:*` name, remove it to
       // avoid extra nesting.
       _printEntitySize(_formatExtraLeadingPackages(node.name), byteSize: node.byteSize, level: level + 1);
     }
   }

   String _formatExtraLeadingPackages(String name) {
     if (!name.startsWith('package')) {
       return name;
     }
     final List<String> chunks = name.split('/');
     if (chunks.length < 2) {
       return name;
     }
     chunks.removeAt(0);
     return chunks.join('/');
   }

   /// Adds breakdown of aot snapshot data as the children of the node at the given path.
   Map<String, Object?> _addAotSnapshotDataToAnalysis({
     required Map<String, Object?> apkAnalysisJson,
     required List<String> path,
     required Map<String, Object?> aotSnapshotJson,
     required Map<String, Object?> precompilerTrace,
   }) {
     Map<String, Object?> currentLevel = apkAnalysisJson;
     currentLevel['precompiler-trace'] = precompilerTrace;
     while (path.isNotEmpty) {
       final List<Map<String, Object?>>? children = currentLevel['children'] as List<Map<String, Object?>>?;
       final Map<String, Object?> childWithPathAsName = children?.firstWhere(
         (Map<String, Object?> child) => (child['n'] as String?) == path.first,
       ) ?? <String, Object?>{};
       path.removeAt(0);
       currentLevel = childWithPathAsName;
     }
     currentLevel['children'] = aotSnapshotJson['children'];
     return apkAnalysisJson;
   }

   List<String> _leadingPaths = <String>[];

   /// Print an entity's name with its size on the same line.
   void _printEntitySize(
     String entityName, {
     required int byteSize,
     required int level,
     bool showColor = true,
     bool emphasis = false,
   }) {
     final String formattedSize = _prettyPrintBytes(byteSize);

     TerminalColor color = TerminalColor.green;
     if (formattedSize.endsWith('MB')) {
       color = TerminalColor.cyan;
     } else if (formattedSize.endsWith('KB')) {
       color = TerminalColor.yellow;
     }

     // Compute any preceding directories, and compare this to the stored
     // directories (in _leadingPaths) for the last entity that was printed. The
     // similarly determines whether or not leading directory information needs to
     // be printed.
     final List<String> localSegments = entityName.split('/')
         ..removeLast();
     int i = 0;
     while (i < _leadingPaths.length && i < localSegments.length && _leadingPaths[i] == localSegments[i]) {
       i += 1;
     }
     for (; i < localSegments.length; i += 1) {
       _logger.printStatus(
         '${localSegments[i]}/',
         indent: (level + i) * 2,
         emphasis: true,
       );
     }
     _leadingPaths = localSegments;

     final String baseName = _fileSystem.path.basename(entityName);
     final int spaceInBetween = tableWidth - (level + i) * 2 - baseName.length - formattedSize.length;
     _logger.printStatus(
       baseName + ' ' * spaceInBetween,
       newline: false,
       emphasis: emphasis,
       indent: (level + i) * 2,
     );
     _logger.printStatus(formattedSize, color: showColor ? color : null);
   }

   String _prettyPrintBytes(int numBytes) {
     const int kB = 1024;
     const int mB = kB * 1024;
     if (numBytes < kB) {
       return '$numBytes B';
     } else if (numBytes < mB) {
       return '${(numBytes / kB).round()} KB';
     } else {
       return '${(numBytes / mB).round()} MB';
     }
   }

   _SymbolNode? _parseAotSnapshot(Map<String, Object?> aotSnapshotJson) {
     final bool isLeafNode = aotSnapshotJson['children'] == null;
     if (!isLeafNode) {
       return _buildNodeWithChildren(aotSnapshotJson);
     } else {
       // TODO(peterdjlee): Investigate why there are leaf nodes with size of null.
       final int? byteSize = aotSnapshotJson['value'] as int?;
       if (byteSize == null) {
         return null;
       }
       return _buildNode(aotSnapshotJson, byteSize);
     }
   }

   _SymbolNode _buildNode(
     Map<String, Object?> aotSnapshotJson,
     int byteSize, {
     List<_SymbolNode> children = const <_SymbolNode>[],
   }) {
     final String name = aotSnapshotJson['n']! as String;
     final Map<String, _SymbolNode> childrenMap = <String, _SymbolNode>{};

     for (final _SymbolNode child in children) {
       childrenMap[child.name] = child;
     }

     return _SymbolNode(
       name,
       byteSize: byteSize,
     )..addAllChildren(children);
   }

   /// Builds a node by recursively building all of its children first
   /// in order to calculate the sum of its children's sizes.
   _SymbolNode? _buildNodeWithChildren(Map<String, Object?> aotSnapshotJson) {
     final List<Object?> rawChildren = aotSnapshotJson['children'] as List<Object?>? ?? <Object?>[];
     final List<_SymbolNode> symbolNodeChildren = <_SymbolNode>[];
     int totalByteSize = 0;

     // Given a child, build its subtree.
     for (final Object? child in rawChildren) {
       if (child == null) {
         continue;
       }
       final _SymbolNode? childTreemapNode = _parseAotSnapshot(child as Map<String, Object?>);
       if (childTreemapNode != null) {
         symbolNodeChildren.add(childTreemapNode);
         totalByteSize += childTreemapNode.byteSize;
       }
     }

     // If none of the children matched the diff tree type
     if (totalByteSize == 0) {
       return null;
     } else {
       return _buildNode(
         aotSnapshotJson,
         totalByteSize,
         children: symbolNodeChildren,
       );
     }
   }
 }

 /// A node class that represents a single symbol for AOT size snapshots.
 class _SymbolNode {
   _SymbolNode(
     this.name, {
     this.byteSize = 0,
   })  : assert(name != null),
         assert(byteSize != null),
         _children = <String, _SymbolNode>{};

   /// The human friendly identifier for this node.
   String name;

   int byteSize;
   void addSize(int sizeToBeAdded) {
     byteSize += sizeToBeAdded;
   }

   _SymbolNode? get parent => _parent;
   _SymbolNode? _parent;

   Iterable<_SymbolNode> get children => _children.values;
   final Map<String, _SymbolNode> _children;

   _SymbolNode? childByName(String name) => _children[name];

   _SymbolNode addChild(_SymbolNode child) {
     assert(child.parent == null);
     assert(!_children.containsKey(child.name),
         'Cannot add duplicate child key ${child.name}');

     child._parent = this;
     _children[child.name] = child;
     return child;
   }

   void addAllChildren(List<_SymbolNode> children) {
     children.forEach(addChild);
   }

   Map<String, Object?> toJson() {
     final Map<String, Object?> json = <String, Object?>{
       'n': name,
       'value': byteSize,
     };
     final List<Map<String, Object?>> childrenAsJson = <Map<String, Object?>>[];
     for (final _SymbolNode child in children) {
       childrenAsJson.add(child.toJson());
     }
     if (childrenAsJson.isNotEmpty) {
       json['children'] = childrenAsJson;
     }
     return json;
   }
 }

 /// Matches `pattern` against the entirety of `string`.
 @visibleForTesting
 Match? matchesPattern(String string, {required Pattern pattern}) {
   final Match? match = pattern.matchAsPrefix(string);
   return (match != null && match.end == string.length) ? match : null;
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'package:archive/archive.dart';
	import 'package:archive/archive_io.dart';
	import 'package:meta/meta.dart';
	import 'package:vm_snapshot_analysis/treemap.dart';

	import '../convert.dart';
	import '../reporting/reporting.dart';
	import 'common.dart';
	import 'file_system.dart';
	import 'logger.dart';
	import 'terminal.dart';

	/// A class to analyze APK and AOT snapshot and generate a breakdown of the data.
	class SizeAnalyzer {
	SizeAnalyzer({
	required FileSystem fileSystem,
	required Logger logger,
	required Usage flutterUsage,
	Pattern appFilenamePattern = 'libapp.so',
	}) : _flutterUsage = flutterUsage,
	_fileSystem = fileSystem,
	_logger = logger,
	_appFilenamePattern = appFilenamePattern;

	final FileSystem _fileSystem;
	final Logger _logger;
	final Pattern _appFilenamePattern;
	final Usage _flutterUsage;
	String? _appFilename;

	static const String aotSnapshotFileName = 'aot-snapshot.json';
	static const int tableWidth = 80;
	static const int _kAotSizeMaxDepth = 2;
	static const int _kZipSizeMaxDepth = 1;

	/// Analyze the [aotSnapshot] in an uncompressed output directory.
	Future<Map<String, Object?>> analyzeAotSnapshot({
	required Directory outputDirectory,
	required File aotSnapshot,
	required File precompilerTrace,
	required String type,
	String? excludePath,
	}) async {
	_logger.printStatus('▒' * tableWidth);
	_logger.printStatus('━' * tableWidth);
	final _SymbolNode aotAnalysisJson = _parseDirectory(
	outputDirectory,
	outputDirectory.parent.path,
	excludePath,
	);

	// Convert an AOT snapshot file into a map.
	final Object? decodedAotSnapshot = json.decode(aotSnapshot.readAsStringSync());
	if (decodedAotSnapshot == null) {
	throwToolExit('AOT snapshot is invalid for analysis');
	}
	final Map<String, Object?> processedAotSnapshotJson = treemapFromJson(decodedAotSnapshot);
	final _SymbolNode? aotSnapshotJsonRoot = _parseAotSnapshot(processedAotSnapshotJson);

	for (final _SymbolNode firstLevelPath in aotAnalysisJson.children) {
	_printEntitySize(
	firstLevelPath.name,
	byteSize: firstLevelPath.byteSize,
	level: 1,
	);
	// Print the expansion of lib directory to show more info for `appFilename`.
	if (firstLevelPath.name == _fileSystem.path.basename(outputDirectory.path) && aotSnapshotJsonRoot != null) {
	_printLibChildrenPaths(firstLevelPath, '', aotSnapshotJsonRoot, _kAotSizeMaxDepth, 0);
	}
	}

	_logger.printStatus('▒' * tableWidth);

	Map<String, Object?> apkAnalysisJson = aotAnalysisJson.toJson();

	apkAnalysisJson['type'] = type; // one of apk, aab, ios, macos, windows, or linux.

	apkAnalysisJson = _addAotSnapshotDataToAnalysis(
	apkAnalysisJson: apkAnalysisJson,
	path: _locatedAotFilePath,
	aotSnapshotJson: processedAotSnapshotJson,
	precompilerTrace: json.decode(precompilerTrace.readAsStringSync()) as Map<String, Object?>? ?? <String, Object?>{},
	);

	assert(_appFilename != null);
	CodeSizeEvent(type, flutterUsage: _flutterUsage).send();
	return apkAnalysisJson;
	}

	/// Analyzes [apk] and [aotSnapshot] to output a [Map] object that includes
	/// the breakdown of the both files, where the breakdown of [aotSnapshot] is placed
	/// under 'lib/arm64-v8a/$_appFilename'.
	///
	/// [kind] must be one of 'apk' or 'aab'.
	/// The [aotSnapshot] can be either instruction sizes snapshot or a v8 snapshot.
	Future<Map<String, Object?>> analyzeZipSizeAndAotSnapshot({
	required File zipFile,
	required File aotSnapshot,
	required File precompilerTrace,
	required String kind,
	}) async {
	assert(kind == 'apk' \|\| kind == 'aab');
	_logger.printStatus('▒' * tableWidth);
	_printEntitySize(
	'${zipFile.basename} (total compressed)',
	byteSize: zipFile.lengthSync(),
	level: 0,
	showColor: false,
	);
	_logger.printStatus('━' * tableWidth);

	final _SymbolNode apkAnalysisRoot = _parseUnzipFile(zipFile);

	// Convert an AOT snapshot file into a map.
	final Object? decodedAotSnapshot = json.decode(aotSnapshot.readAsStringSync());
	if (decodedAotSnapshot == null) {
	throwToolExit('AOT snapshot is invalid for analysis');
	}
	final Map<String, Object?> processedAotSnapshotJson = treemapFromJson(decodedAotSnapshot);
	final _SymbolNode? aotSnapshotJsonRoot = _parseAotSnapshot(processedAotSnapshotJson);
	if (aotSnapshotJsonRoot != null) {
	for (final _SymbolNode firstLevelPath in apkAnalysisRoot.children) {
	_printLibChildrenPaths(firstLevelPath, '', aotSnapshotJsonRoot, _kZipSizeMaxDepth, 0);
	}
	}
	_logger.printStatus('▒' * tableWidth);

	Map<String, Object?> apkAnalysisJson = apkAnalysisRoot.toJson();

	apkAnalysisJson['type'] = kind;

	assert(_appFilename != null);
	apkAnalysisJson = _addAotSnapshotDataToAnalysis(
	apkAnalysisJson: apkAnalysisJson,
	path: _locatedAotFilePath,
	aotSnapshotJson: processedAotSnapshotJson,
	precompilerTrace: json.decode(precompilerTrace.readAsStringSync()) as Map<String, Object?>? ?? <String, Object?>{},
	);
	CodeSizeEvent(kind, flutterUsage: _flutterUsage).send();
	return apkAnalysisJson;
	}

	_SymbolNode _parseUnzipFile(File zipFile) {
	final Archive archive = ZipDecoder().decodeBytes(zipFile.readAsBytesSync());
	final Map<List<String>, int> pathsToSize = <List<String>, int>{};

	for (final ArchiveFile archiveFile in archive.files) {
	final InputStreamBase? rawContent = archiveFile.rawContent;
	if (rawContent != null) {
	pathsToSize[_fileSystem.path.split(archiveFile.name)] = rawContent.length;
	}
	}
	return _buildSymbolTree(pathsToSize);
	}

	_SymbolNode _parseDirectory(Directory directory, String relativeTo, String? excludePath) {
	final Map<List<String>, int> pathsToSize = <List<String>, int>{};
	for (final File file in directory.listSync(recursive: true).whereType<File>()) {
	if (excludePath != null && file.uri.pathSegments.contains(excludePath)) {
	continue;
	}
	final List<String> path = _fileSystem.path.split(
	_fileSystem.path.relative(file.path, from: relativeTo));
	pathsToSize[path] = file.lengthSync();
	}
	return _buildSymbolTree(pathsToSize);
	}

	List<String> _locatedAotFilePath = <String>[];

	List<String> _buildNodeName(_SymbolNode start, _SymbolNode? parent) {
	final List<String> results = <String>[start.name];
	while (parent != null && parent.name != 'Root') {
	results.insert(0, parent.name);
	parent = parent.parent;
	}
	return results;
	}

	_SymbolNode _buildSymbolTree(Map<List<String>, int> pathsToSize) {
	final _SymbolNode rootNode = _SymbolNode('Root');
	_SymbolNode currentNode = rootNode;

	for (final List<String> paths in pathsToSize.keys) {
	for (final String path in paths) {
	_SymbolNode? childWithPathAsName = currentNode.childByName(path);

	if (childWithPathAsName == null) {
	childWithPathAsName = _SymbolNode(path);
	if (matchesPattern(path, pattern: _appFilenamePattern) != null) {
	_appFilename = path;
	childWithPathAsName.name += ' (Dart AOT)';
	_locatedAotFilePath = _buildNodeName(childWithPathAsName, currentNode);
	} else if (path == 'libflutter.so') {
	childWithPathAsName.name += ' (Flutter Engine)';
	}
	currentNode.addChild(childWithPathAsName);
	}
	childWithPathAsName.addSize(pathsToSize[paths] ?? 0);
	currentNode = childWithPathAsName;
	}
	currentNode = rootNode;
	}
	return rootNode;
	}

	/// Prints all children paths for the lib/ directory in an APK.
	///
	/// A brief summary of aot snapshot is printed under 'lib/arm64-v8a/$_appFilename'.
	void _printLibChildrenPaths(
	_SymbolNode currentNode,
	String totalPath,
	_SymbolNode aotSnapshotJsonRoot,
	int maxDepth,
	int currentDepth,
	) {
	totalPath += currentNode.name;

	assert(_appFilename != null);
	if (currentNode.children.isNotEmpty
	&& currentNode.name != '$_appFilename (Dart AOT)'
	&& currentDepth < maxDepth
	&& currentNode.byteSize >= 1000) {
	for (final _SymbolNode child in currentNode.children) {
	_printLibChildrenPaths(child, '$totalPath/', aotSnapshotJsonRoot, maxDepth, currentDepth + 1);
	}
	_leadingPaths = totalPath.split('/')
	..removeLast();
	} else {
	// Print total path and size if currentNode does not have any children and is
	// larger than 1KB
	final bool isAotSnapshotPath = _locatedAotFilePath.join('/').contains(totalPath);
	if (currentNode.byteSize >= 1000 \|\| isAotSnapshotPath) {
	_printEntitySize(totalPath, byteSize: currentNode.byteSize, level: 1, emphasis: currentNode.children.isNotEmpty);
	if (isAotSnapshotPath) {
	_printAotSnapshotSummary(aotSnapshotJsonRoot, level: totalPath.split('/').length);
	}
	_leadingPaths = totalPath.split('/')
	..removeLast();
	}
	}
	}

	/// Go through the AOT gen snapshot size JSON and print out a collapsed summary
	/// for the first package level.
	void _printAotSnapshotSummary(_SymbolNode aotSnapshotRoot, {int maxDirectoriesShown = 20, required int level}) {
	_printEntitySize(
	'Dart AOT symbols accounted decompressed size',
	byteSize: aotSnapshotRoot.byteSize,
	level: level,
	emphasis: true,
	);

	final List<_SymbolNode> sortedSymbols = aotSnapshotRoot.children.toList()
	// Remove entries like @unknown, @shared, and @stubs as well as private dart libraries
	// which are not interpretable by end users.
	..removeWhere((_SymbolNode node) => node.name.startsWith('@') \|\| node.name.startsWith('dart:_'))
	..sort((_SymbolNode a, _SymbolNode b) => b.byteSize.compareTo(a.byteSize));
	for (final _SymbolNode node in sortedSymbols.take(maxDirectoriesShown)) {
	// Node names will have an extra leading `package:*` name, remove it to
	// avoid extra nesting.
	_printEntitySize(_formatExtraLeadingPackages(node.name), byteSize: node.byteSize, level: level + 1);
	}
	}

	String _formatExtraLeadingPackages(String name) {
	if (!name.startsWith('package')) {
	return name;
	}
	final List<String> chunks = name.split('/');
	if (chunks.length < 2) {
	return name;
	}
	chunks.removeAt(0);
	return chunks.join('/');
	}

	/// Adds breakdown of aot snapshot data as the children of the node at the given path.
	Map<String, Object?> _addAotSnapshotDataToAnalysis({
	required Map<String, Object?> apkAnalysisJson,
	required List<String> path,
	required Map<String, Object?> aotSnapshotJson,
	required Map<String, Object?> precompilerTrace,
	}) {
	Map<String, Object?> currentLevel = apkAnalysisJson;
	currentLevel['precompiler-trace'] = precompilerTrace;
	while (path.isNotEmpty) {
	final List<Map<String, Object?>>? children = currentLevel['children'] as List<Map<String, Object?>>?;
	final Map<String, Object?> childWithPathAsName = children?.firstWhere(
	(Map<String, Object?> child) => (child['n'] as String?) == path.first,
	) ?? <String, Object?>{};
	path.removeAt(0);
	currentLevel = childWithPathAsName;
	}
	currentLevel['children'] = aotSnapshotJson['children'];
	return apkAnalysisJson;
	}

	List<String> _leadingPaths = <String>[];

	/// Print an entity's name with its size on the same line.
	void _printEntitySize(
	String entityName, {
	required int byteSize,
	required int level,
	bool showColor = true,
	bool emphasis = false,
	}) {
	final String formattedSize = _prettyPrintBytes(byteSize);

	TerminalColor color = TerminalColor.green;
	if (formattedSize.endsWith('MB')) {
	color = TerminalColor.cyan;
	} else if (formattedSize.endsWith('KB')) {
	color = TerminalColor.yellow;
	}

	// Compute any preceding directories, and compare this to the stored
	// directories (in _leadingPaths) for the last entity that was printed. The
	// similarly determines whether or not leading directory information needs to
	// be printed.
	final List<String> localSegments = entityName.split('/')
	..removeLast();
	int i = 0;
	while (i < _leadingPaths.length && i < localSegments.length && _leadingPaths[i] == localSegments[i]) {
	i += 1;
	}
	for (; i < localSegments.length; i += 1) {
	_logger.printStatus(
	'${localSegments[i]}/',
	indent: (level + i) * 2,
	emphasis: true,
	);
	}
	_leadingPaths = localSegments;

	final String baseName = _fileSystem.path.basename(entityName);
	final int spaceInBetween = tableWidth - (level + i) * 2 - baseName.length - formattedSize.length;
	_logger.printStatus(
	baseName + ' ' * spaceInBetween,
	newline: false,
	emphasis: emphasis,
	indent: (level + i) * 2,
	);
	_logger.printStatus(formattedSize, color: showColor ? color : null);
	}

	String _prettyPrintBytes(int numBytes) {
	const int kB = 1024;
	const int mB = kB * 1024;
	if (numBytes < kB) {
	return '$numBytes B';
	} else if (numBytes < mB) {
	return '${(numBytes / kB).round()} KB';
	} else {
	return '${(numBytes / mB).round()} MB';
	}
	}

	_SymbolNode? _parseAotSnapshot(Map<String, Object?> aotSnapshotJson) {
	final bool isLeafNode = aotSnapshotJson['children'] == null;
	if (!isLeafNode) {
	return _buildNodeWithChildren(aotSnapshotJson);
	} else {
	// TODO(peterdjlee): Investigate why there are leaf nodes with size of null.
	final int? byteSize = aotSnapshotJson['value'] as int?;
	if (byteSize == null) {
	return null;
	}
	return _buildNode(aotSnapshotJson, byteSize);
	}
	}

	_SymbolNode _buildNode(
	Map<String, Object?> aotSnapshotJson,
	int byteSize, {
	List<_SymbolNode> children = const <_SymbolNode>[],
	}) {
	final String name = aotSnapshotJson['n']! as String;
	final Map<String, _SymbolNode> childrenMap = <String, _SymbolNode>{};

	for (final _SymbolNode child in children) {
	childrenMap[child.name] = child;
	}

	return _SymbolNode(
	name,
	byteSize: byteSize,
	)..addAllChildren(children);
	}

	/// Builds a node by recursively building all of its children first
	/// in order to calculate the sum of its children's sizes.
	_SymbolNode? _buildNodeWithChildren(Map<String, Object?> aotSnapshotJson) {
	final List<Object?> rawChildren = aotSnapshotJson['children'] as List<Object?>? ?? <Object?>[];
	final List<_SymbolNode> symbolNodeChildren = <_SymbolNode>[];
	int totalByteSize = 0;

	// Given a child, build its subtree.
	for (final Object? child in rawChildren) {
	if (child == null) {
	continue;
	}
	final _SymbolNode? childTreemapNode = _parseAotSnapshot(child as Map<String, Object?>);
	if (childTreemapNode != null) {
	symbolNodeChildren.add(childTreemapNode);
	totalByteSize += childTreemapNode.byteSize;
	}
	}

	// If none of the children matched the diff tree type
	if (totalByteSize == 0) {
	return null;
	} else {
	return _buildNode(
	aotSnapshotJson,
	totalByteSize,
	children: symbolNodeChildren,
	);
	}
	}
	}

	/// A node class that represents a single symbol for AOT size snapshots.
	class _SymbolNode {
	_SymbolNode(
	this.name, {
	this.byteSize = 0,
	}) : assert(name != null),
	assert(byteSize != null),
	_children = <String, _SymbolNode>{};

	/// The human friendly identifier for this node.
	String name;

	int byteSize;
	void addSize(int sizeToBeAdded) {
	byteSize += sizeToBeAdded;
	}

	_SymbolNode? get parent => _parent;
	_SymbolNode? _parent;

	Iterable<_SymbolNode> get children => _children.values;
	final Map<String, _SymbolNode> _children;

	_SymbolNode? childByName(String name) => _children[name];

	_SymbolNode addChild(_SymbolNode child) {
	assert(child.parent == null);
	assert(!_children.containsKey(child.name),
	'Cannot add duplicate child key ${child.name}');

	child._parent = this;
	_children[child.name] = child;
	return child;
	}

	void addAllChildren(List<_SymbolNode> children) {
	children.forEach(addChild);
	}

	Map<String, Object?> toJson() {
	final Map<String, Object?> json = <String, Object?>{
	'n': name,
	'value': byteSize,
	};
	final List<Map<String, Object?>> childrenAsJson = <Map<String, Object?>>[];
	for (final _SymbolNode child in children) {
	childrenAsJson.add(child.toJson());
	}
	if (childrenAsJson.isNotEmpty) {
	json['children'] = childrenAsJson;
	}
	return json;
	}
	}

	/// Matches `pattern` against the entirety of `string`.
	@visibleForTesting
	Match? matchesPattern(String string, {required Pattern pattern}) {
	final Match? match = pattern.matchAsPrefix(string);
	return (match != null && match.end == string.length) ? match : null;
	}