pkg/vm/bin/compare_sizes.dart - sdk - Git at Google

 // Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 // This tool compares two JSON size reports produced by
 // --print-instructions-sizes-to and reports which symbols increased in size
 // and which symbols decreased in size.

 import 'dart:convert';
 import 'dart:io';
 import 'dart:math' as math;

 bool limitWidth = false;

 void main(List<String> args) {
   if (args.length == 3 && args[2] == 'narrow') {
     limitWidth = true;
   } else if (args.length != 2) {
     print("""
 Usage: dart ${Platform.script} <old.json> <new.json> [narrow]

 This tool compares two JSON size reports produced by
 --print-instructions-sizes-to and reports which symbols increased in size
 and which symbols decreased in size. The optional 'narrow' parameter limits
 the colunm widths.
 """);
     exit(-1);
   }

   final oldSizes = loadSymbolSizes(args[0]);
   final newSizes = loadSymbolSizes(args[1]);

   var totalOld = 0;
   var totalNew = 0;
   var totalDiff = 0;
   final diffBySymbol = <String, int>{};

   // Process all symbols (from both old and new results) and compute the change
   // in size. If symbol is not present in the compilation assume its size to be
   // zero.
   for (var key in Set<String>()..addAll(newSizes.keys)..addAll(oldSizes.keys)) {
     final oldSize = oldSizes[key] ?? 0;
     final newSize = newSizes[key] ?? 0;
     final diff = newSize - oldSize;
     if (diff != 0) diffBySymbol[key] = diff;
     totalOld += oldSize;
     totalNew += newSize;
     totalDiff += diff;
   }

   // Compute the list of changed symbols sorted by difference (descending).
   final changedSymbolsBySize = diffBySymbol.keys.toList();
   changedSymbolsBySize.sort((a, b) => diffBySymbol[b] - diffBySymbol[a]);

   // Now produce the report table.
   const numLargerSymbolsToReport = 30;
   const numSmallerSymbolsToReport = 10;
   final table = AsciiTable(header: [
     Text.left('Library'),
     Text.left('Method'),
     Text.right('Diff (Bytes)')
   ]);

   // Report [numLargerSymbolsToReport] symbols that increased in size most.
   for (var key in changedSymbolsBySize
       .where((k) => diffBySymbol[k] > 0)
       .take(numLargerSymbolsToReport)) {
     final name = key.split(librarySeparator);
     table.addRow([name[0], name[1], '+${diffBySymbol[key]}']);
   }
   table.addSeparator(Separator.Wave);

   // Report [numSmallerSymbolsToReport] symbols that decreased in size most.
   for (var key in changedSymbolsBySize.reversed
       .where((k) => diffBySymbol[k] < 0)
       .take(numSmallerSymbolsToReport)
       .toList()
       .reversed) {
     final name = key.split(librarySeparator);
     table.addRow([name[0], name[1], '${diffBySymbol[key]}']);
   }
   table.addSeparator();

   table.render();
   print('Comparing ${args[0]} (old) to ${args[1]} (new)');
   print('Old   : ${totalOld} bytes.');
   print('New   : ${totalNew} bytes.');
   print('Change: ${totalDiff > 0 ? '+' : ''}${totalDiff} bytes.');
 }

 /// A combination of characters that is unlikely to occur in the symbol name.
 const String librarySeparator = ',';

 /// Load --print-instructions-sizes-to output as a mapping from symbol names
 /// to their sizes.
 ///
 /// Note: we produce a single symbol name from function name and library name
 /// by concatenating them with [librarySeparator].
 Map<String, int> loadSymbolSizes(String name) {
   final symbols = jsonDecode(File(name).readAsStringSync());
   final result = new Map<String, int>();
   final regexp = new RegExp(r"0x[a-fA-F0-9]+");
   for (int i = 0, n = symbols.length; i < n; i++) {
     final e = symbols[i];
     // Obtain a key by combining library and method name. Strip anything
     // after the library separator to make sure we can easily decode later.
     // For method names, also remove non-deterministic parts to avoid
     // reporting non-existing differences against the same layout.
     String lib = ((e['l'] ?? '').split(librarySeparator))[0];
     String name = (e['n'].split(librarySeparator))[0]
         .replaceAll('[Optimized] ', '')
         .replaceAll(regexp, '');
     String key = lib + librarySeparator + name;
     int val = e['s'];
     result[key] =
         (result[key] ?? 0) + val; // add (key,val), accumulate if exists
   }
   return result;
 }

 /// A row in the [AsciiTable].
 abstract class Row {
   String render(List<int> widths, List<AlignmentDirection> alignments);
 }

 enum Separator {
   /// Line separator looks like this: `+-------+------+`
   Line,

   /// Wave separator looks like this: `~~~~~~~~~~~~~~~~` repeated twice.
   Wave
 }

 /// A separator row in the [AsciiTable].
 class SeparatorRow extends Row {
   final Separator filler;
   SeparatorRow(this.filler);

   @override
   String render(List<int> widths, List<AlignmentDirection> alignments) {
     switch (filler) {
       case Separator.Line:
         final sb = StringBuffer();
         sb.write('+');
         for (var i = 0; i < widths.length; i++) {
           sb.write('-' * (widths[i] + 2));
           sb.write('+');
         }
         return sb.toString();

       case Separator.Wave:
         final sb = StringBuffer();
         sb.write('~');
         for (var i = 0; i < widths.length; i++) {
           sb.write('~' * (widths[i] + 2));
           sb.write('~');
         }
         return sb.toString() + '\n' + sb.toString();
     }
     return null; // Make analyzer happy.
   }
 }

 class NormalRow extends Row {
   final List<dynamic> columns;
   NormalRow(this.columns);

   @override
   String render(List<int> widths, List<AlignmentDirection> alignments) {
     final sb = StringBuffer();
     sb.write('|');
     for (var i = 0; i < widths.length; i++) {
       sb.write(' ');
       final text = columns[i] is Text
           ? columns[i]
           : Text(value: columns[i], direction: alignments[i]);
       sb.write(text.render(widths[i]));
       sb.write(' |');
     }
     return sb.toString();
   }
 }

 enum AlignmentDirection { Left, Right, Center }

 /// A chunk of text aligned in the given direction within a cell.
 class Text {
   final String value;
   final AlignmentDirection direction;

   Text({this.value, this.direction});
   Text.left(String value)
       : this(value: value, direction: AlignmentDirection.Left);
   Text.right(String value)
       : this(value: value, direction: AlignmentDirection.Right);
   Text.center(String value)
       : this(value: value, direction: AlignmentDirection.Center);

   String render(int width) {
     if (value.length > width) {
       // Narrowed column.
       return value.substring(0, width - 2) + '..';
     }
     switch (direction) {
       case AlignmentDirection.Left:
         return value.padRight(width);
       case AlignmentDirection.Right:
         return value.padLeft(width);
       case AlignmentDirection.Center:
         final diff = width - value.length;
         return ' ' * (diff ~/ 2) + value + (' ' * (diff - diff ~/ 2));
     }
     return null; // Make analyzer happy.
   }

   int get length => value.length;
 }

 class AsciiTable {
   final List<Row> rows = <Row>[];
   AsciiTable({List<dynamic> header}) {
     if (header != null) {
       addSeparator();
       addRow(header);
       addSeparator();
     }
   }

   void addRow(List<dynamic> columns) => rows.add(NormalRow(columns));

   void addSeparator([Separator filler = Separator.Line]) =>
       rows.add(SeparatorRow(filler));

   void render() {
     // We assume that the first row gives us alignment directions that
     // subsequent rows would follow.
     List<AlignmentDirection> alignments = rows
         .whereType<NormalRow>()
         .first
         .columns
         .map((v) => v is Text ? v.direction : AlignmentDirection.Left)
         .toList();
     List<int> widths =
         List<int>.filled(rows.whereType<NormalRow>().first.columns.length, 0);

     // Compute max width for each column in the table.
     for (var row in rows.whereType<NormalRow>()) {
       assert(row.columns.length == widths.length);
       for (var i = 0; i < widths.length; i++) {
         widths[i] = math.max(row.columns[i].length, widths[i]);
       }
     }

     if (limitWidth) {
       for (var i = 0; i < widths.length; i++) {
         widths[i] = math.min(widths[i], 25);
       }
     }

     for (var row in rows) {
       print(row.render(widths, alignments));
     }
   }
 }
	// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	// This tool compares two JSON size reports produced by
	// --print-instructions-sizes-to and reports which symbols increased in size
	// and which symbols decreased in size.

	import 'dart:convert';
	import 'dart:io';
	import 'dart:math' as math;

	bool limitWidth = false;

	void main(List<String> args) {
	if (args.length == 3 && args[2] == 'narrow') {
	limitWidth = true;
	} else if (args.length != 2) {
	print("""
	Usage: dart ${Platform.script} <old.json> <new.json> [narrow]

	This tool compares two JSON size reports produced by
	--print-instructions-sizes-to and reports which symbols increased in size
	and which symbols decreased in size. The optional 'narrow' parameter limits
	the colunm widths.
	""");
	exit(-1);
	}

	final oldSizes = loadSymbolSizes(args[0]);
	final newSizes = loadSymbolSizes(args[1]);

	var totalOld = 0;
	var totalNew = 0;
	var totalDiff = 0;
	final diffBySymbol = <String, int>{};

	// Process all symbols (from both old and new results) and compute the change
	// in size. If symbol is not present in the compilation assume its size to be
	// zero.
	for (var key in Set<String>()..addAll(newSizes.keys)..addAll(oldSizes.keys)) {
	final oldSize = oldSizes[key] ?? 0;
	final newSize = newSizes[key] ?? 0;
	final diff = newSize - oldSize;
	if (diff != 0) diffBySymbol[key] = diff;
	totalOld += oldSize;
	totalNew += newSize;
	totalDiff += diff;
	}

	// Compute the list of changed symbols sorted by difference (descending).
	final changedSymbolsBySize = diffBySymbol.keys.toList();
	changedSymbolsBySize.sort((a, b) => diffBySymbol[b] - diffBySymbol[a]);

	// Now produce the report table.
	const numLargerSymbolsToReport = 30;
	const numSmallerSymbolsToReport = 10;
	final table = AsciiTable(header: [
	Text.left('Library'),
	Text.left('Method'),
	Text.right('Diff (Bytes)')
	]);

	// Report [numLargerSymbolsToReport] symbols that increased in size most.
	for (var key in changedSymbolsBySize
	.where((k) => diffBySymbol[k] > 0)
	.take(numLargerSymbolsToReport)) {
	final name = key.split(librarySeparator);
	table.addRow([name[0], name[1], '+${diffBySymbol[key]}']);
	}
	table.addSeparator(Separator.Wave);

	// Report [numSmallerSymbolsToReport] symbols that decreased in size most.
	for (var key in changedSymbolsBySize.reversed
	.where((k) => diffBySymbol[k] < 0)
	.take(numSmallerSymbolsToReport)
	.toList()
	.reversed) {
	final name = key.split(librarySeparator);
	table.addRow([name[0], name[1], '${diffBySymbol[key]}']);
	}
	table.addSeparator();

	table.render();
	print('Comparing ${args[0]} (old) to ${args[1]} (new)');
	print('Old : ${totalOld} bytes.');
	print('New : ${totalNew} bytes.');
	print('Change: ${totalDiff > 0 ? '+' : ''}${totalDiff} bytes.');
	}

	/// A combination of characters that is unlikely to occur in the symbol name.
	const String librarySeparator = ',';

	/// Load --print-instructions-sizes-to output as a mapping from symbol names
	/// to their sizes.
	///
	/// Note: we produce a single symbol name from function name and library name
	/// by concatenating them with [librarySeparator].
	Map<String, int> loadSymbolSizes(String name) {
	final symbols = jsonDecode(File(name).readAsStringSync());
	final result = new Map<String, int>();
	final regexp = new RegExp(r"0x[a-fA-F0-9]+");
	for (int i = 0, n = symbols.length; i < n; i++) {
	final e = symbols[i];
	// Obtain a key by combining library and method name. Strip anything
	// after the library separator to make sure we can easily decode later.
	// For method names, also remove non-deterministic parts to avoid
	// reporting non-existing differences against the same layout.
	String lib = ((e['l'] ?? '').split(librarySeparator))[0];
	String name = (e['n'].split(librarySeparator))[0]
	.replaceAll('[Optimized] ', '')
	.replaceAll(regexp, '');
	String key = lib + librarySeparator + name;
	int val = e['s'];
	result[key] =
	(result[key] ?? 0) + val; // add (key,val), accumulate if exists
	}
	return result;
	}

	/// A row in the [AsciiTable].
	abstract class Row {
	String render(List<int> widths, List<AlignmentDirection> alignments);
	}

	enum Separator {
	/// Line separator looks like this: `+-------+------+`
	Line,

	/// Wave separator looks like this: `~~~~~~~~~~~~~~~~` repeated twice.
	Wave
	}

	/// A separator row in the [AsciiTable].
	class SeparatorRow extends Row {
	final Separator filler;
	SeparatorRow(this.filler);

	@override
	String render(List<int> widths, List<AlignmentDirection> alignments) {
	switch (filler) {
	case Separator.Line:
	final sb = StringBuffer();
	sb.write('+');
	for (var i = 0; i < widths.length; i++) {
	sb.write('-' * (widths[i] + 2));
	sb.write('+');
	}
	return sb.toString();

	case Separator.Wave:
	final sb = StringBuffer();
	sb.write('~');
	for (var i = 0; i < widths.length; i++) {
	sb.write('~' * (widths[i] + 2));
	sb.write('~');
	}
	return sb.toString() + '\n' + sb.toString();
	}
	return null; // Make analyzer happy.
	}
	}

	class NormalRow extends Row {
	final List<dynamic> columns;
	NormalRow(this.columns);

	@override
	String render(List<int> widths, List<AlignmentDirection> alignments) {
	final sb = StringBuffer();
	sb.write('\|');
	for (var i = 0; i < widths.length; i++) {
	sb.write(' ');
	final text = columns[i] is Text
	? columns[i]
	: Text(value: columns[i], direction: alignments[i]);
	sb.write(text.render(widths[i]));
	sb.write(' \|');
	}
	return sb.toString();
	}
	}

	enum AlignmentDirection { Left, Right, Center }

	/// A chunk of text aligned in the given direction within a cell.
	class Text {
	final String value;
	final AlignmentDirection direction;

	Text({this.value, this.direction});
	Text.left(String value)
	: this(value: value, direction: AlignmentDirection.Left);
	Text.right(String value)
	: this(value: value, direction: AlignmentDirection.Right);
	Text.center(String value)
	: this(value: value, direction: AlignmentDirection.Center);

	String render(int width) {
	if (value.length > width) {
	// Narrowed column.
	return value.substring(0, width - 2) + '..';
	}
	switch (direction) {
	case AlignmentDirection.Left:
	return value.padRight(width);
	case AlignmentDirection.Right:
	return value.padLeft(width);
	case AlignmentDirection.Center:
	final diff = width - value.length;
	return ' ' * (diff ~/ 2) + value + (' ' * (diff - diff ~/ 2));
	}
	return null; // Make analyzer happy.
	}

	int get length => value.length;
	}

	class AsciiTable {
	final List<Row> rows = <Row>[];
	AsciiTable({List<dynamic> header}) {
	if (header != null) {
	addSeparator();
	addRow(header);
	addSeparator();
	}
	}

	void addRow(List<dynamic> columns) => rows.add(NormalRow(columns));

	void addSeparator([Separator filler = Separator.Line]) =>
	rows.add(SeparatorRow(filler));

	void render() {
	// We assume that the first row gives us alignment directions that
	// subsequent rows would follow.
	List<AlignmentDirection> alignments = rows
	.whereType<NormalRow>()
	.first
	.columns
	.map((v) => v is Text ? v.direction : AlignmentDirection.Left)
	.toList();
	List<int> widths =
	List<int>.filled(rows.whereType<NormalRow>().first.columns.length, 0);

	// Compute max width for each column in the table.
	for (var row in rows.whereType<NormalRow>()) {
	assert(row.columns.length == widths.length);
	for (var i = 0; i < widths.length; i++) {
	widths[i] = math.max(row.columns[i].length, widths[i]);
	}
	}

	if (limitWidth) {
	for (var i = 0; i < widths.length; i++) {
	widths[i] = math.min(widths[i], 25);
	}
	}

	for (var row in rows) {
	print(row.render(widths, alignments));
	}
	}
	}