Vijay Menon
f95daf6168
This supersedes https://dart-review.googlesource.com/c/sdk/+/4614. Patch 1 is the unmodified source_map_stack_trace.dart. Patch 2 is my fixes for DDC. Change-Id: I30c6fad4bdc75061edbacc5fc75482af98e29bbb Reviewed-on: https://dart-review.googlesource.com/4960 Reviewed-by: Jacob Richman <jacobr@google.com> Reviewed-by: Jake Macdonald <jakemac@google.com> Commit-Queue: Vijay Menon <vsm@google.com>
71 lines
2.7 KiB
Dart
71 lines
2.7 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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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 new Chain(stackTrace.traces.map((trace) {
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return new Trace.from(mapStackTrace(sourceMap, trace, roots: roots));
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}));
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}
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var trace = new Trace.from(stackTrace);
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return new 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 == null ? 0 : frame.column;
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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.startsWith('dart:')) {
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sourceUrl = relative;
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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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return new 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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/// Reformats a JS member name to make it look more Dart-like.
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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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return suffix == 'fn' ? member : suffix;
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}
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