mirror of
https://github.com/dart-lang/sdk
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d2882856ef
In anticipation of lints v 2.0. See: https://dart-review.googlesource.com/c/sdk/+/237746 Change-Id: If6ec7f0bae314af3aa84e4d8a7b9fc1b8219c128 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/237763 Reviewed-by: Nicholas Shahan <nshahan@google.com> Reviewed-by: Srujan Gaddam <srujzs@google.com> Commit-Queue: Phil Quitslund <pquitslund@google.com>
131 lines
5.1 KiB
Dart
131 lines
5.1 KiB
Dart
// Copyright (c) 2017, 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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// @dart = 2.9
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import 'package:path/path.dart' as p;
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import 'package:source_maps/source_maps.dart';
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import 'package:stack_trace/stack_trace.dart';
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/// This is a fork of package:source_map_stack_trace, a tool for
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/// dart2js-compiled code, reworked for DDC.
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/// Convert [stackTrace], a stack trace generated by DDC-compiled
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/// JavaScript, to a native-looking stack trace using [sourceMap].
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///
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/// [roots] are the paths (usually `http:` URI strings) that DDC applications
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/// are served from. This is used to identify sdk and package URIs.
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StackTrace mapStackTrace(Mapping sourceMap, StackTrace stackTrace,
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{List<String> roots}) {
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if (stackTrace is Chain) {
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return Chain(stackTrace.traces.map((trace) {
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return Trace.from(mapStackTrace(sourceMap, trace, roots: roots));
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}));
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}
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var trace = Trace.from(stackTrace);
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return Trace(trace.frames.map((frame) {
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// If there's no line information, there's no way to translate this frame.
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// We could return it as-is, but these lines are usually not useful anyways.
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if (frame.line == null) return null;
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// If there's no column, try using the first column of the line.
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var column = frame.column ?? 0;
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// Subtract 1 because stack traces use 1-indexed lines and columns and
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// source maps uses 0-indexed.
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var span = sourceMap.spanFor(frame.line - 1, column - 1,
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uri: frame.uri?.toString());
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// If we can't find a source span, ignore the frame. It's probably something
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// internal that the user doesn't care about.
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if (span == null) return null;
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var sourceUrl = span.sourceUrl.toString();
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for (var root in roots) {
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if (root != null && p.url.isWithin(root, sourceUrl)) {
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var relative = p.url.relative(sourceUrl, from: root);
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if (relative.contains('dart:')) {
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sourceUrl = relative.substring(relative.indexOf('dart:'));
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break;
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}
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var packageRoot = '$root/packages';
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if (p.url.isWithin(packageRoot, sourceUrl)) {
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sourceUrl = 'package:${p.url.relative(sourceUrl, from: packageRoot)}';
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break;
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}
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}
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}
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if (!sourceUrl.startsWith('dart:') &&
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!sourceUrl.startsWith('package:') &&
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sourceUrl.contains('dart_sdk')) {
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// This compresses the long dart_sdk URLs if SDK source maps are missing.
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// It's no longer linkable, but neither are the properly mapped ones
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// above.
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sourceUrl = 'dart:sdk_internal';
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}
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return Frame(Uri.parse(sourceUrl), span.start.line + 1,
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span.start.column + 1, _prettifyMember(frame.member));
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}).where((frame) => frame != null));
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}
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final escapedPipe = '\$124';
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final escapedPound = '\$35';
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/// Reformats a JS member name to make it look more Dart-like.
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///
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/// Logic copied from build/build_web_compilers/web/stack_trace_mapper.dart.
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/// TODO(https://github.com/dart-lang/sdk/issues/38869): Remove this logic when
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/// DDC stack trace deobfuscation is overhauled.
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String _prettifyMember(String member) {
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var last = member.lastIndexOf('.');
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if (last < 0) return member;
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var suffix = member.substring(last + 1);
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member = suffix == 'fn' ? member : suffix;
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// We avoid unescaping the entire member here due to DDC's deduping mechanism
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// introducing trailing $N.
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member = member.replaceAll(escapedPipe, '|');
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return member.contains('|') ? _prettifyExtension(member) : member;
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}
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/// Reformats a JS member name as an extension method invocation.
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String _prettifyExtension(String member) {
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var isSetter = false;
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var pipeIndex = member.indexOf('|');
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var spaceIndex = member.indexOf(' ');
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var poundIndex = member.indexOf('escapedPound');
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if (spaceIndex >= 0) {
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// Here member is a static field or static getter/setter.
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isSetter = member.substring(0, spaceIndex) == 'set';
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member = member.substring(spaceIndex + 1, member.length);
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} else if (poundIndex >= 0) {
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// Here member is a tearoff or local property getter/setter.
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isSetter = member.substring(pipeIndex + 1, poundIndex) == 'set';
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member = member.replaceRange(pipeIndex + 1, poundIndex + 3, '');
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} else {
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var body = member.substring(pipeIndex + 1, member.length);
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if (body.startsWith('unary') || body.startsWith('\$')) {
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// Here member's an operator, so it's safe to unescape everything lazily.
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member = _unescape(member);
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}
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}
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member = member.replaceAll('|', '.');
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return isSetter ? '$member=' : member;
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}
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/// Unescapes a DDC-escaped JS identifier name.
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///
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/// Identifier names that contain illegal JS characters are escaped by DDC to a
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/// decimal representation of the symbol's UTF-16 value.
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/// Warning: this greedily escapes characters, so it can be unsafe in the event
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/// that an escaped sequence precedes a number literal in the JS name.
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String _unescape(String name) {
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return name.replaceAllMapped(
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RegExp(r'\$[0-9]+'),
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(m) =>
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String.fromCharCode(int.parse(name.substring(m.start + 1, m.end))));
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}
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