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// Copyright (c) 2017, 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.
// @dart = 2.8
/// A tool that invokes the CFE to compute kernel summary files.
///
/// This script can be used as a command-line command or a persistent server.
/// The server is implemented using the bazel worker protocol, so it can be used
/// within bazel as is. Other tools (like pub-build and package-build) also
/// use this persistent worker via the same protocol.
import 'dart:async';
import 'dart:io';
import 'dart:isolate';
import 'package:args/args.dart';
import 'package:bazel_worker/bazel_worker.dart';
import 'package:build_integration/file_system/multi_root.dart';
import 'package:dev_compiler/src/kernel/target.dart';
import 'package:front_end/src/api_unstable/bazel_worker.dart' as fe;
import 'package:kernel/ast.dart' show Component, Library, Reference;
import 'package:kernel/target/targets.dart';
import 'package:vm/target/vm.dart';
import 'package:vm/target/flutter.dart';
import 'package:vm/target/flutter_runner.dart';
import 'package:compiler/src/kernel/dart2js_target.dart';
/// [sendPort] may be passed in when started in an isolate. If provided, it is
/// used for bazel worker communication instead of stdin/stdout.
main(List<String> args, SendPort sendPort) async {
args = preprocessArgs(args);
if (args.contains('--persistent_worker')) {
if (args.length != 1) {
throw new StateError(
"unexpected args, expected only --persistent-worker but got: $args");
}
await new KernelWorker(sendPort: sendPort).run();
} else {
var result = await computeKernel(args);
if (!result.succeeded) {
exitCode = 15;
}
}
}
/// A bazel worker loop that can compute full or summary kernel files.
class KernelWorker extends AsyncWorkerLoop {
fe.InitializedCompilerState previousState;
/// If [sendPort] is provided it is used for bazel worker communication
/// instead of stdin/stdout.
KernelWorker({SendPort sendPort})
: super(
connection: sendPort == null
? null
: SendPortAsyncWorkerConnection(sendPort));
Future<WorkResponse> performRequest(WorkRequest request) async {
var outputBuffer = new StringBuffer();
var response = new WorkResponse()..exitCode = 0;
try {
fe.InitializedCompilerState previousStateToPass;
if (request.arguments.contains("--reuse-compiler-result")) {
previousStateToPass = previousState;
} else {
previousState = null;
}
var result = await computeKernel(request.arguments,
isWorker: true,
outputBuffer: outputBuffer,
inputs: request.inputs,
previousState: previousStateToPass);
previousState = result.previousState;
if (!result.succeeded) {
response.exitCode = 15;
}
} catch (e, s) {
outputBuffer.writeln(e);
outputBuffer.writeln(s);
response.exitCode = 15;
}
response.output = outputBuffer.toString();
return response;
}
}
/// If the last arg starts with `@`, this reads the file it points to and treats
/// each line as an additional arg.
///
/// This is how individual work request args are differentiated from startup
/// args in bazel (inidividual work request args go in that file).
List<String> preprocessArgs(List<String> args) {
args = new List.from(args);
if (args.isEmpty) {
return args;
}
String lastArg = args.last;
if (lastArg.startsWith('@')) {
File argsFile = new File(lastArg.substring(1));
try {
args.removeLast();
args.addAll(argsFile.readAsLinesSync());
} on FileSystemException catch (e) {
throw new Exception('Failed to read file specified by $lastArg : $e');
}
}
return args;
}
/// An [ArgParser] for generating kernel summaries.
final summaryArgsParser = new ArgParser()
..addFlag('help', negatable: false, abbr: 'h')
..addFlag('exclude-non-sources',
negatable: false,
help: 'Whether source files loaded implicitly should be included as '
'part of the summary.')
..addFlag('summary-only',
defaultsTo: true,
negatable: true,
help: 'Whether to only build summary files.')
..addOption('target',
allowed: const [
'vm',
'flutter',
'flutter_runner',
'dart2js',
'ddc',
],
help: 'Build kernel for the vm, flutter, flutter_runner, dart2js or ddc')
..addOption('dart-sdk-summary')
..addMultiOption('input-summary')
..addMultiOption('input-linked')
..addMultiOption('multi-root')
..addOption('multi-root-scheme', defaultsTo: 'org-dartlang-multi-root')
..addOption('libraries-file')
..addOption('packages-file')
..addMultiOption('source')
..addOption('output')
..addFlag('reuse-compiler-result', defaultsTo: false)
..addFlag('use-incremental-compiler', defaultsTo: false)
..addOption('used-inputs')
..addFlag('track-widget-creation', defaultsTo: false)
..addMultiOption('enable-experiment',
help: 'Enable a language experiment when invoking the CFE.')
..addMultiOption('define', abbr: 'D')
..addFlag('verbose', defaultsTo: false)
..addFlag('sound-null-safety', defaultsTo: false)
..addOption('verbosity',
defaultsTo: fe.Verbosity.defaultValue,
help: 'Sets the verbosity level used for filtering messages during '
'compilation.',
allowed: fe.Verbosity.allowedValues,
allowedHelp: fe.Verbosity.allowedValuesHelp);
class ComputeKernelResult {
final bool succeeded;
final fe.InitializedCompilerState previousState;
ComputeKernelResult(this.succeeded, this.previousState);
}
/// Computes a kernel file based on [args].
///
/// If [isWorker] is true then exit codes will not be set on failure.
///
/// If [outputBuffer] is provided then messages will be written to that buffer
/// instead of printed to the console.
///
/// Returns whether or not the summary was successfully output.
Future<ComputeKernelResult> computeKernel(List<String> args,
{bool isWorker: false,
StringBuffer outputBuffer,
Iterable<Input> inputs,
fe.InitializedCompilerState previousState}) async {
dynamic out = outputBuffer ?? stderr;
bool succeeded = true;
var parsedArgs = summaryArgsParser.parse(args);
if (parsedArgs['help']) {
out.writeln(summaryArgsParser.usage);
if (!isWorker) exit(0);
return new ComputeKernelResult(false, previousState);
}
// Bazel creates an overlay file system where some files may be located in the
// source tree, some in a gendir, and some in a bindir. The multi-root file
// system hides this from the front end.
var multiRoots = parsedArgs['multi-root'].map(Uri.base.resolve).toList();
if (multiRoots.isEmpty) multiRoots.add(Uri.base);
var fileSystem = new MultiRootFileSystem(parsedArgs['multi-root-scheme'],
multiRoots, fe.StandardFileSystem.instance);
var sources = (parsedArgs['source'] as List<String>).map(_toUri).toList();
var excludeNonSources = parsedArgs['exclude-non-sources'] as bool;
var nnbdMode = parsedArgs['sound-null-safety'] as bool
? fe.NnbdMode.Strong
: fe.NnbdMode.Weak;
var summaryOnly = parsedArgs['summary-only'] as bool;
var trackWidgetCreation = parsedArgs['track-widget-creation'] as bool;
// TODO(sigmund,jakemac): make target mandatory. We allow null to be backwards
// compatible while we migrate existing clients of this tool.
var targetName =
(parsedArgs['target'] as String) ?? (summaryOnly ? 'ddc' : 'vm');
var targetFlags = new TargetFlags(
trackWidgetCreation: trackWidgetCreation,
enableNullSafety: nnbdMode == fe.NnbdMode.Strong);
Target target;
switch (targetName) {
case 'vm':
target = new VmTarget(targetFlags);
if (summaryOnly) {
out.writeln('error: --summary-only not supported for the vm target');
}
break;
case 'flutter':
target = new FlutterTarget(targetFlags);
if (summaryOnly) {
throw new ArgumentError(
'error: --summary-only not supported for the flutter target');
}
break;
case 'flutter_runner':
target = new FlutterRunnerTarget(targetFlags);
if (summaryOnly) {
throw new ArgumentError('error: --summary-only not supported for the '
'flutter_runner target');
}
break;
case 'dart2js':
target = new Dart2jsTarget('dart2js', targetFlags);
if (summaryOnly) {
out.writeln(
'error: --summary-only not supported for the dart2js target');
}
break;
case 'ddc':
// TODO(jakemac):If `generateKernel` changes to return a summary
// component, process the component instead.
target =
new DevCompilerSummaryTarget(sources, excludeNonSources, targetFlags);
if (!summaryOnly) {
out.writeln('error: --no-summary-only not supported for the '
'ddc target');
}
break;
default:
out.writeln('error: unsupported target: $targetName');
}
List<Uri> linkedInputs =
(parsedArgs['input-linked'] as List<String>).map(_toUri).toList();
List<Uri> summaryInputs =
(parsedArgs['input-summary'] as List<String>).map(_toUri).toList();
fe.InitializedCompilerState state;
bool usingIncrementalCompiler = false;
bool recordUsedInputs = parsedArgs["used-inputs"] != null;
var environmentDefines = _parseEnvironmentDefines(parsedArgs['define']);
var verbose = parsedArgs['verbose'] as bool;
var verbosity = fe.Verbosity.parseArgument(parsedArgs['verbosity']);
if (parsedArgs['use-incremental-compiler']) {
usingIncrementalCompiler = true;
/// Build a map of uris to digests.
final inputDigests = <Uri, List<int>>{};
if (inputs != null) {
for (var input in inputs) {
inputDigests[_toUri(input.path)] = input.digest;
}
}
// If digests weren't given and if not in worker mode, create fake data and
// ensure we don't have a previous state (as that wouldn't be safe with
// fake input digests).
if (!isWorker && inputDigests.isEmpty) {
previousState = null;
inputDigests[_toUri(parsedArgs['dart-sdk-summary'])] = const [0];
for (Uri uri in summaryInputs) {
inputDigests[uri] = const [0];
}
for (Uri uri in linkedInputs) {
inputDigests[uri] = const [0];
}
}
state = await fe.initializeIncrementalCompiler(
previousState,
{
"target=$targetName",
"trackWidgetCreation=$trackWidgetCreation",
"multiRootScheme=${fileSystem.markerScheme}",
"multiRootRoots=${fileSystem.roots}",
},
_toUri(parsedArgs['dart-sdk-summary']),
_toUri(parsedArgs['packages-file']),
_toUri(parsedArgs['libraries-file']),
[...summaryInputs, ...linkedInputs],
inputDigests,
target,
fileSystem,
(parsedArgs['enable-experiment'] as List<String>),
summaryOnly,
environmentDefines,
trackNeededDillLibraries: recordUsedInputs,
verbose: verbose,
nnbdMode: nnbdMode);
} else {
state = await fe.initializeCompiler(
// TODO(sigmund): pass an old state once we can make use of it.
null,
_toUri(parsedArgs['dart-sdk-summary']),
_toUri(parsedArgs['libraries-file']),
_toUri(parsedArgs['packages-file']),
[...summaryInputs, ...linkedInputs],
target,
fileSystem,
parsedArgs['enable-experiment'] as List<String>,
environmentDefines,
verbose: verbose,
nnbdMode: nnbdMode);
}
void onDiagnostic(fe.DiagnosticMessage message) {
if (fe.Verbosity.shouldPrint(verbosity, message)) {
fe.printDiagnosticMessage(message, out.writeln);
}
if (message.severity == fe.Severity.error) {
succeeded = false;
}
}
List<int> kernel;
bool wroteUsedDills = false;
if (usingIncrementalCompiler) {
state.options.onDiagnostic = onDiagnostic;
Component incrementalComponent = await state.incrementalCompiler
.computeDelta(entryPoints: sources, fullComponent: true);
if (recordUsedInputs) {
Set<Uri> usedOutlines = {};
for (Library lib in state.incrementalCompiler.neededDillLibraries) {
if (lib.importUri.scheme == "dart") continue;
Uri uri = state.libraryToInputDill[lib.importUri];
if (uri == null) {
throw new StateError("Library ${lib.importUri} was recorded as used, "
"but was not in the list of known libraries.");
}
usedOutlines.add(uri);
}
var outputUsedFile = new File(parsedArgs["used-inputs"]);
outputUsedFile.createSync(recursive: true);
outputUsedFile.writeAsStringSync(usedOutlines.join("\n"));
wroteUsedDills = true;
}
kernel = await state.incrementalCompiler.context.runInContext((_) {
if (summaryOnly) {
incrementalComponent.uriToSource.clear();
incrementalComponent.problemsAsJson = null;
incrementalComponent.setMainMethodAndMode(
null, true, incrementalComponent.mode);
target.performOutlineTransformations(incrementalComponent);
makeStable(incrementalComponent);
return Future.value(fe.serializeComponent(incrementalComponent,
includeSources: false, includeOffsets: false));
}
makeStable(incrementalComponent);
return Future.value(fe.serializeComponent(incrementalComponent,
filter: excludeNonSources
? (library) => sources.contains(library.importUri)
: null,
includeOffsets: true));
});
} else if (summaryOnly) {
kernel = await fe.compileSummary(state, sources, onDiagnostic,
includeOffsets: false);
} else {
Component component =
await fe.compileComponent(state, sources, onDiagnostic);
kernel = fe.serializeComponent(component,
filter: excludeNonSources
? (library) => sources.contains(library.importUri)
: null,
includeOffsets: true);
}
state.options.onDiagnostic = null; // See http://dartbug.com/36983.
if (!wroteUsedDills && recordUsedInputs) {
// The path taken didn't record inputs used: Say we used everything.
var outputUsedFile = new File(parsedArgs["used-inputs"]);
outputUsedFile.createSync(recursive: true);
Set<Uri> allFiles = {...summaryInputs, ...linkedInputs};
outputUsedFile.writeAsStringSync(allFiles.join("\n"));
wroteUsedDills = true;
}
if (kernel != null) {
var outputFile = new File(parsedArgs['output']);
outputFile.createSync(recursive: true);
outputFile.writeAsBytesSync(kernel);
} else {
assert(!succeeded);
}
return new ComputeKernelResult(succeeded, state);
}
/// Make sure the output is stable by sorting libraries and additional exports.
void makeStable(Component c) {
// Make sure the output is stable.
c.libraries.sort((l1, l2) {
return "${l1.fileUri}".compareTo("${l2.fileUri}");
});
c.problemsAsJson?.sort();
c.computeCanonicalNames();
for (Library library in c.libraries) {
library.additionalExports.sort((Reference r1, Reference r2) {
return "${r1.canonicalName}".compareTo("${r2.canonicalName}");
});
library.problemsAsJson?.sort();
}
}
/// Extends the DevCompilerTarget to transform outlines to meet the requirements
/// of summaries in bazel and package-build.
///
/// Build systems like package-build may provide the same input file twice to
/// the summary worker, but only intends to have it in one output summary. The
/// convention is that if it is listed as a source, it is intended to be part of
/// the output, if the source file was loaded as a dependency, then it was
/// already included in a different summary. The transformation below ensures
/// that the output summary doesn't include those implicit inputs.
///
/// Note: this transformation is destructive and is only intended to be used
/// when generating summaries.
class DevCompilerSummaryTarget extends DevCompilerTarget {
final List<Uri> sources;
final bool excludeNonSources;
DevCompilerSummaryTarget(
this.sources, this.excludeNonSources, TargetFlags targetFlags)
: super(targetFlags);
@override
void performOutlineTransformations(Component component) {
super.performOutlineTransformations(component);
if (!excludeNonSources) return;
List<Library> libraries = new List.from(component.libraries);
component.libraries.clear();
Set<Uri> include = sources.toSet();
for (var lib in libraries) {
if (include.contains(lib.importUri)) {
component.libraries.add(lib);
} else {
// Excluding the library also means that their canonical names will not
// be computed as part of serialization, so we need to do that
// preemtively here to avoid errors when serializing references to
// elements of these libraries.
component.root.getChildFromUri(lib.importUri).bindTo(lib.reference);
lib.computeCanonicalNames();
}
}
}
}
Uri _toUri(String uriString) {
if (uriString == null) return null;
// Windows-style paths use '\', so convert them to '/' in case they've been
// concatenated with Unix-style paths.
return Uri.base.resolve(uriString.replaceAll("\\", "/"));
}
Map<String, String> _parseEnvironmentDefines(List<String> args) {
var environment = <String, String>{};
for (var arg in args) {
var eq = arg.indexOf('=');
if (eq <= 0) {
var kind = eq == 0 ? 'name' : 'value';
throw FormatException('no $kind given to -D option `$arg`');
}
var name = arg.substring(0, eq);
var value = arg.substring(eq + 1);
environment[name] = value;
}
return environment;
}