Sigmund Cherem
7c77ed04f4
This is an initial implementation of the dart deobfuscator tool. Let me know your thoughts on the package name. I used to have this named as `package:deobfuscate`, but it feels like we will want to add more tools that are not about deobfuscation in the future, so I picked `package:dart2js_tools` instead. That also gives us the opportunity to move over the dart2js_info code here too. Change-Id: I2ff948982969c9c76bc84cdc78cbe237abc87378 Reviewed-on: https://dart-review.googlesource.com/69243 Reviewed-by: Stephen Adams <sra@google.com> Commit-Queue: Sigmund Cherem <sigmund@google.com>
90 lines
2.8 KiB
Dart
90 lines
2.8 KiB
Dart
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:io';
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import 'package:dart2js_tools/src/util.dart';
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/// Script to show a text representation of the inlining data attached to
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/// source-map files.
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///
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/// This expands the push/pop operations and checks simple invariants (e.g. that
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/// the stack is always empty at the beginning of a function).
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main(List<String> args) {
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if (args.length != 1) {
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print('usage: show_inline_data.dart <js-file>');
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exit(1);
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}
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var uri = Uri.base.resolve(args[0]);
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var provider = new CachingFileProvider();
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var mapping = provider.mappingFor(uri);
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var starts = functionStarts(provider.sourcesFor(uri));
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var file = provider.fileFor(uri);
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var frames = mapping.frames;
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var offsets = frames.keys.toList()..sort();
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var sb = new StringBuffer();
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int depth = 0;
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int lastFunctionStart = null;
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for (var offset in offsets) {
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int functionStart = nextFunctionStart(starts, offset, lastFunctionStart);
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if (lastFunctionStart == null || functionStart > lastFunctionStart) {
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sb.write('\n${location(starts[functionStart], file)}: function start\n');
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if (depth != 0) {
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sb.write(
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"[31m[invalid] function start with non-zero depth: $depth[0m\n");
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}
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lastFunctionStart = functionStart;
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}
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var offsetPrefix = '${location(offset, file)}:';
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var pad = ' ' * offsetPrefix.length;
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sb.write(offsetPrefix);
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bool first = true;
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for (var frame in frames[offset]) {
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if (!first) sb.write('$pad');
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sb.write(' $frame\n');
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first = false;
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if (frame.isPush) depth++;
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if (frame.isPop) depth--;
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if (frame.isEmpty && depth != 0) {
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sb.write("[31m[invalid] pop-empty with non-zero depth: $depth[0m\n");
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}
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if (!frame.isEmpty && depth == 0) {
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sb.write("[31m[invalid] non-empty pop with zero depth: $depth[0m\n");
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}
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if (depth < 0) {
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sb.write("[31m[invalid] negative depth: $depth[0m\n");
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}
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}
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}
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print('$sb');
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}
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var _functionDeclarationRegExp = new RegExp(r':( )?function\(');
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List<int> functionStarts(String sources) {
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List<int> result = [];
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int index = sources.indexOf(_functionDeclarationRegExp);
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while (index != -1) {
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result.add(index + 2);
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index = sources.indexOf(_functionDeclarationRegExp, index + 1);
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}
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return result;
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}
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int nextFunctionStart(List<int> starts, int offset, int last) {
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int j = last ?? 0;
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for (; j < starts.length && starts[j] <= offset; j++);
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return j - 1;
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}
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String location(int offset, file) {
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var line = file.getLine(offset) + 1;
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var column = file.getColumn(offset) + 1;
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var location = '$offset ($line:$column)';
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return location + (' ' * (16 - location.length));
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}
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