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[vm_snapshot_analysis] Reduce test sensitivity.
Some compiler changes introduce small fluctuation into the output sizes which make the test too brittle. Ignore this fluctuation by introducing sensitivity threshold. Fixes https://github.com/dart-lang/sdk/issues/43030 R=rmacnak@google.com Fixed: 43030 Cq-Include-Trybots: luci.dart.try:pkg-linux-release-try,pkg-win-release-try,pkg-mac-release-try Change-Id: I411144db199d36f40b71739965a44802305970b6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/158386 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
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@ -370,8 +370,6 @@ void main() async {
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diffToJson(diff),
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equals({
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'#type': 'library',
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'@stubs': {'#type': 'library'},
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'@unknown': {'#type': 'library'},
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'package:input': {
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'#type': 'package',
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'package:input/input.dart': {
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@ -421,8 +419,6 @@ void main() async {
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diffToJson(diff),
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equals({
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'#type': 'library',
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'@stubs': {'#type': 'library'},
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'@unknown': {'#type': 'library'},
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'package:input': {
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'#type': 'package',
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'package:input/input.dart': {
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@ -624,8 +620,6 @@ void main() async {
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'#type': 'package',
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'package:input/input.dart': {
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'#type': 'library',
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'#size': lessThan(0),
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'K': {'#size': isA<int>(), '#type': 'class'},
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'::': {
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'#type': 'class',
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'makeSomeClosures': {
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@ -691,10 +685,48 @@ Future withV8Profile(String prefix, Map<String, String> source,
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// On Windows there is some issue with interpreting entry point URI as a package URI
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// it instead gets interpreted as a file URI - which breaks comparison. So we
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// simply ignore entry point library (main.dart).
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// Additionally this function removes all nodes with the size below
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// the given threshold.
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Map<String, dynamic> diffToJson(ProgramInfo diff,
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{bool keepOnlyInputPackage = false}) {
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final diffJson = diff.toJson();
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diffJson.removeWhere((key, _) =>
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keepOnlyInputPackage ? key != 'package:input' : key.startsWith('file:'));
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return diffJson;
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// Rebuild the diff JSON discarding all nodes with size below threshold.
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const smallChangeThreshold = 16;
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Map<String, dynamic> discardSmallChanges(Map<String, dynamic> map) {
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final result = <String, dynamic>{};
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// First recursively process all children (skipping #type and #size keys).
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for (var key in map.keys) {
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if (key == '#type' || key == '#size') continue;
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final value = discardSmallChanges(map[key]);
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if (value != null) {
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result[key] = value;
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}
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}
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// Check if this node own #size is above the threshold and copy it
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// into the result if it is.
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final size = map['#size'] ?? 0;
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if (size.abs() > smallChangeThreshold) {
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result['#size'] = size;
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}
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// If the node has no children and its own size does not pass the threshold
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// drop it.
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if (result.isEmpty) {
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return null;
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}
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// We decided that this node is meaningful - preserve its type.
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if (map.containsKey('#type')) {
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result['#type'] = map['#type'];
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}
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return result;
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}
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return discardSmallChanges(diffJson);
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}
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