Fasta infrastructure.

pkg/fasta/lib/src/compile_platform.dart

+// Copyright (c) 2016, 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 fasta.compile_platform;
+
+import 'dart:async' show
+    Future;
+
+import 'dart:io' show
+    File,
+    IOSink;
+
+import 'package:analyzer/src/generated/source.dart' show
+    Source;
+
+import 'package:analyzer/dart/element/element.dart' show
+    ExportElement,
+    LibraryElement;
+
+import 'package:kernel/kernel.dart' show
+    Repository;
+
+import 'package:kernel/ast.dart' show
+    Field,
+    Library,
+    Name,
+    Program,
+    StringLiteral;
+
+import 'package:kernel/binary/ast_to_binary.dart' show
+    BinaryPrinter;
+
+import 'package:kernel/analyzer/loader.dart' show
+    DartLoader,
+    DartOptions,
+    createDartSdk;
+
+import 'package:kernel/target/targets.dart' show
+    Target,
+    TargetFlags,
+    getTarget;
+
+import 'package:kernel/repository.dart' show
+    Repository;
+
+import 'package:kernel/ast.dart' show
+    Program;
+
+import 'environment_variable.dart' show
+    EnvironmentVariableDirectory,
+    fileExists;
+
+import 'errors.dart' show
+    inputError;
+
+const EnvironmentVariableSdk dartAotSdk = const EnvironmentVariableSdk(
+    "DART_AOT_SDK",
+    "The environment variable 'DART_AOT_SDK' should point to a patched SDK.");
+
+class EnvironmentVariableSdk extends EnvironmentVariableDirectory {
+  const EnvironmentVariableSdk(String name, String what)
+      : super(name, what);
+
+  Future<Null> validate(String value) async {
+    Uri sdk = Uri.base.resolveUri(new Uri.directory(value));
+    const String asyncDart = "lib/async/async.dart";
+    if (!await fileExists(sdk, asyncDart)) {
+      inputError(null, null,
+          "The environment variable '$name' has the value '$value', "
+          "that's a directory that doesn't contain '$asyncDart'. $what");
+    }
+    const String asyncSources = "lib/async/async_sources.gypi";
+    if (await fileExists(sdk, asyncSources)) {
+      inputError(null, null,
+          "The environment variable '$name' has the value '$value', "
+          "that's a directory that contains '$asyncSources', so it isn't a "
+          "patched SDK. $what");
+    }
+    return null;
+  }
+}
+
+main(List<String> arguments) async {
+  Uri output = Uri.base.resolveUri(new Uri.file(arguments.single));
+  DartOptions options = new DartOptions(
+      strongMode: false, sdk: await dartAotSdk.value, packagePath: null);
+  Repository repository = new Repository();
+  DartLoader loader = new DartLoader(repository, options, null,
+      ignoreRedirectingFactories: false,
+      dartSdk: createDartSdk(options.sdk, strongMode: options.strongMode));
+  Target target = getTarget(
+      "vm", new TargetFlags(strongMode: options.strongMode));
+  Library dummyLibrary = repository.getLibraryReference(Uri.parse("dummy:"))
+      ..isExternal = false;
+  Program program =
+      loader.loadProgram(dummyLibrary.importUri, target: target);
+  program = new Program(
+      program.libraries.where(
+          (Library l) => l.importUri.scheme == "dart").toList(),
+      program.uriToLineStarts);
+  if (loader.errors.isNotEmpty) {
+    inputError(null, null, loader.errors.join("\n"));
+  }
+  target.transformProgram(program);
+  for (LibraryElement analyzerLibrary in loader.libraryElements) {
+    Library library = loader.getLibraryReference(analyzerLibrary);
+    StringBuffer sb = new StringBuffer();
+    if (analyzerLibrary.exports.isNotEmpty) {
+      Source source;
+      int offset;
+      for (ExportElement export in analyzerLibrary.exports) {
+        source ??= export.source;
+        offset ??= export.nameOffset;
+        Uri uri = export.exportedLibrary.source.uri;
+        sb.write("export '");
+        sb.write(uri);
+        sb.write("'");
+        if (export.combinators.isNotEmpty) {
+          sb.write(" ");
+          sb.writeAll(export.combinators, " ");
+        }
+        sb.write(";");
+      }
+      Name exports = new Name("_exports#", library);
+      StringLiteral literal = new StringLiteral("$sb")
+          ..fileOffset = offset;
+      library.addMember(new Field(exports, isStatic: true, isConst: true,
+              initializer: literal, fileUri: "${new Uri.file(source.fullName)}")
+          ..fileOffset = offset);
+    }
+  }
+
+  IOSink sink = new File.fromUri(output).openWrite();
+  new BinaryPrinter(sink).writeProgramFile(program);
+  await sink.close();
+}