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Unified Diff: mojo/public/dart/third_party/stack_trace/lib/src/stack_zone_specification.dart

Issue 1346773002: Stop running pub get at gclient sync time and fix build bugs (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 3 months ago
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Index: mojo/public/dart/third_party/stack_trace/lib/src/stack_zone_specification.dart
diff --git a/mojo/public/dart/third_party/stack_trace/lib/src/stack_zone_specification.dart b/mojo/public/dart/third_party/stack_trace/lib/src/stack_zone_specification.dart
new file mode 100644
index 0000000000000000000000000000000000000000..25d96427110f76a22b134fbaa2634025225434cd
--- /dev/null
+++ b/mojo/public/dart/third_party/stack_trace/lib/src/stack_zone_specification.dart
@@ -0,0 +1,236 @@
+// Copyright (c) 2013, 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.
+
+library stack_trace.stack_zone_specification;
+
+import 'dart:async';
+
+import 'trace.dart';
+import 'chain.dart';
+
+/// A class encapsulating the zone specification for a [Chain.capture] zone.
+///
+/// Until they're materialized and exposed to the user, stack chains are tracked
+/// as linked lists of [Trace]s using the [_Node] class. These nodes are stored
+/// in three distinct ways:
+///
+/// * When a callback is registered, a node is created and stored as a captured
+/// local variable until the callback is run.
+///
+/// * When a callback is run, its captured node is set as the [_currentNode] so
+/// it can be available to [Chain.current] and to be linked into additional
+/// chains when more callbacks are scheduled.
+///
+/// * When a callback throws an error or a Future or Stream emits an error, the
+/// current node is associated with that error's stack trace using the
+/// [_chains] expando.
+///
+/// Since [ZoneSpecification] can't be extended or even implemented, in order to
+/// get a real [ZoneSpecification] instance it's necessary to call [toSpec].
+class StackZoneSpecification {
+ /// The expando that associates stack chains with [StackTrace]s.
+ ///
+ /// The chains are associated with stack traces rather than errors themselves
+ /// because it's a common practice to throw strings as errors, which can't be
+ /// used with expandos.
+ ///
+ /// The chain associated with a given stack trace doesn't contain a node for
+ /// that stack trace.
+ final _chains = new Expando<_Node>("stack chains");
+
+ /// The error handler for the zone.
+ ///
+ /// If this is null, that indicates that any unhandled errors should be passed
+ /// to the parent zone.
+ final ChainHandler _onError;
+
+ /// The most recent node of the current stack chain.
+ _Node _currentNode;
+
+ StackZoneSpecification([this._onError]);
+
+ /// Converts [this] to a real [ZoneSpecification].
+ ZoneSpecification toSpec() {
+ return new ZoneSpecification(
+ handleUncaughtError: handleUncaughtError,
+ registerCallback: registerCallback,
+ registerUnaryCallback: registerUnaryCallback,
+ registerBinaryCallback: registerBinaryCallback,
+ errorCallback: errorCallback);
+ }
+
+ /// Returns the current stack chain.
+ ///
+ /// By default, the first frame of the first trace will be the line where
+ /// [currentChain] is called. If [level] is passed, the first trace will start
+ /// that many frames up instead.
+ Chain currentChain([int level=0]) => _createNode(level + 1).toChain();
+
+ /// Returns the stack chain associated with [trace], if one exists.
+ ///
+ /// The first stack trace in the returned chain will always be [trace]
+ /// (converted to a [Trace] if necessary). If there is no chain associated
+ /// with [trace], this just returns a single-trace chain containing [trace].
+ Chain chainFor(StackTrace trace) {
+ if (trace is Chain) return trace;
+ var previous = trace == null ? null : _chains[trace];
+ return new _Node(trace, previous).toChain();
+ }
+
+ /// Ensures that an error emitted by [future] has the correct stack
+ /// information associated with it.
+ ///
+ /// By default, the first frame of the first trace will be the line where
+ /// [trackFuture] is called. If [level] is passed, the first trace will start
+ /// that many frames up instead.
+ Future trackFuture(Future future, [int level=0]) {
+ var completer = new Completer.sync();
+ var node = _createNode(level + 1);
+ future.then(completer.complete).catchError((e, stackTrace) {
+ if (stackTrace == null) stackTrace = new Trace.current();
+ if (stackTrace is! Chain && _chains[stackTrace] == null) {
+ _chains[stackTrace] = node;
+ }
+ completer.completeError(e, stackTrace);
+ });
+ return completer.future;
+ }
+
+ /// Ensures that any errors emitted by [stream] have the correct stack
+ /// information associated with them.
+ ///
+ /// By default, the first frame of the first trace will be the line where
+ /// [trackStream] is called. If [level] is passed, the first trace will start
+ /// that many frames up instead.
+ Stream trackStream(Stream stream, [int level=0]) {
+ var node = _createNode(level + 1);
+ return stream.transform(new StreamTransformer.fromHandlers(
+ handleError: (error, stackTrace, sink) {
+ if (stackTrace == null) stackTrace = new Trace.current();
+ if (stackTrace is! Chain && _chains[stackTrace] == null) {
+ _chains[stackTrace] = node;
+ }
+ sink.addError(error, stackTrace);
+ }));
+ }
+
+ /// Tracks the current stack chain so it can be set to [_currentChain] when
+ /// [f] is run.
+ ZoneCallback registerCallback(Zone self, ZoneDelegate parent, Zone zone,
+ Function f) {
+ if (f == null) return parent.registerCallback(zone, null);
+ var node = _createNode(1);
+ return parent.registerCallback(zone, () => _run(f, node));
+ }
+
+ /// Tracks the current stack chain so it can be set to [_currentChain] when
+ /// [f] is run.
+ ZoneUnaryCallback registerUnaryCallback(Zone self, ZoneDelegate parent,
+ Zone zone, Function f) {
+ if (f == null) return parent.registerUnaryCallback(zone, null);
+ var node = _createNode(1);
+ return parent.registerUnaryCallback(zone, (arg) {
+ return _run(() => f(arg), node);
+ });
+ }
+
+ /// Tracks the current stack chain so it can be set to [_currentChain] when
+ /// [f] is run.
+ ZoneBinaryCallback registerBinaryCallback(Zone self, ZoneDelegate parent,
+ Zone zone, Function f) {
+ if (f == null) return parent.registerBinaryCallback(zone, null);
+ var node = _createNode(1);
+ return parent.registerBinaryCallback(zone, (arg1, arg2) {
+ return _run(() => f(arg1, arg2), node);
+ });
+ }
+
+ /// Looks up the chain associated with [stackTrace] and passes it either to
+ /// [_onError] or [parent]'s error handler.
+ handleUncaughtError(Zone self, ZoneDelegate parent, Zone zone, error,
+ StackTrace stackTrace) {
+ var stackChain = chainFor(stackTrace);
+ if (_onError == null) {
+ return parent.handleUncaughtError(zone, error, stackChain);
+ }
+
+ // TODO(nweiz): Currently this copies a lot of logic from [runZoned]. Just
+ // allow [runBinary] to throw instead once issue 18134 is fixed.
+ try {
+ return parent.runBinary(zone, _onError, error, stackChain);
+ } catch (newError, newStackTrace) {
+ if (identical(newError, error)) {
+ return parent.handleUncaughtError(zone, error, stackChain);
+ } else {
+ return parent.handleUncaughtError(zone, newError, newStackTrace);
+ }
+ }
+ }
+
+ /// Attaches the current stack chain to [stackTrace], replacing it if
+ /// necessary.
+ AsyncError errorCallback(Zone self, ZoneDelegate parent, Zone zone,
+ Object error, StackTrace stackTrace) {
+ // Go up two levels to get through [_CustomZone.errorCallback].
+ if (stackTrace == null) {
+ stackTrace = _createNode(2).toChain();
+ } else {
+ if (_chains[stackTrace] == null) _chains[stackTrace] = _createNode(2);
+ }
+
+ var asyncError = parent.errorCallback(zone, error, stackTrace);
+ return asyncError == null ? new AsyncError(error, stackTrace) : asyncError;
+ }
+
+ /// Creates a [_Node] with the current stack trace and linked to
+ /// [_currentNode].
+ ///
+ /// By default, the first frame of the first trace will be the line where
+ /// [_createNode] is called. If [level] is passed, the first trace will start
+ /// that many frames up instead.
+ _Node _createNode([int level=0]) =>
+ new _Node(new Trace.current(level + 1), _currentNode);
+
+ // TODO(nweiz): use a more robust way of detecting and tracking errors when
+ // issue 15105 is fixed.
+ /// Runs [f] with [_currentNode] set to [node].
+ ///
+ /// If [f] throws an error, this associates [node] with that error's stack
+ /// trace.
+ _run(Function f, _Node node) {
+ var previousNode = _currentNode;
+ _currentNode = node;
+ try {
+ return f();
+ } catch (e, stackTrace) {
+ _chains[stackTrace] = node;
+ rethrow;
+ } finally {
+ _currentNode = previousNode;
+ }
+ }
+}
+
+/// A linked list node representing a single entry in a stack chain.
+class _Node {
+ /// The stack trace for this link of the chain.
+ final Trace trace;
+
+ /// The previous node in the chain.
+ final _Node previous;
+
+ _Node(StackTrace trace, [this.previous])
+ : trace = trace == null ? new Trace.current() : new Trace.from(trace);
+
+ /// Converts this to a [Chain].
+ Chain toChain() {
+ var nodes = <Trace>[];
+ var node = this;
+ while (node != null) {
+ nodes.add(node.trace);
+ node = node.previous;
+ }
+ return new Chain(nodes);
+ }
+}

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