Implement line and column numbers.

pkg/front_end/lib/src/fasta/kernel/kernel_target.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.kernel_target;
 
 import 'dart:async' show
     Future;
 
 import 'dart:io' show
@@ skipping 57 matching lines @@
 
 import '../ast_kind.dart' show
     AstKind;
 
 import '../errors.dart' show
     InputError,
     internalError,
     reportCrash,
     resetCrashReporting;
 
+import '../util/relativize.dart' show
+    relativizeUri;
+
+import '../compiler_context.dart' show
+    CompilerContext;
+
 import 'kernel_builder.dart' show
     Builder,
     ClassBuilder,
     DynamicTypeBuilder,
     InvalidTypeBuilder,
     KernelClassBuilder,
     KernelLibraryBuilder,
     KernelNamedTypeBuilder,
     KernelProcedureBuilder,
     LibraryBuilder,
     MixinApplicationBuilder,
     NamedMixinApplicationBuilder,
     NamedTypeBuilder,
     TypeBuilder;
 
 class KernelTarget extends TargetImplementation {
   final DillTarget dillTarget;
+
+  /// Shared with [CompilerContext].
+  final Map<String, Source> uriToSource;
+
   SourceLoader<Library> loader;
   Program program;
 
   final List errors = [];
 
-  KernelTarget(DillTarget dillTarget, TranslateUri uriTranslator)
+  KernelTarget(DillTarget dillTarget, TranslateUri uriTranslator,
+      [Map<String, Source> uriToSource])
       : dillTarget = dillTarget,
+        uriToSource = uriToSource ?? CompilerContext.current.uriToSource,
         super(dillTarget.ticker, uriTranslator) {
     resetCrashReporting();
     loader = new SourceLoader<Library>(this);
   }
 
+  void addLineStarts(Uri uri, List<int> lineStarts) {
+    String fileUri = relativizeUri(uri);
+    uriToSource[fileUri] = new Source(lineStarts, fileUri);
+  }
+
   void read(Uri uri) {
     loader.read(uri);
   }
 
   LibraryBuilder createLibraryBuilder(Uri uri, Uri fileUri) {
     if (dillTarget.isLoaded) {
       var builder = dillTarget.loader.builders[uri];
       if (builder != null) {
         return builder;
       }
@@ skipping 193 matching lines @@
     // that used when there's no fileUri on an element. Instead, ensure all
     // elements have a fileUri.
     uriToSource[""] = new Source(<int>[0], "");
     Program program = new Program(libraries, uriToSource);
     if (loader.first != null) {
       Builder builder = loader.first.members["main"];
       if (builder is KernelProcedureBuilder) {
         program.mainMethod = builder.procedure;
       }
     }
-    setup_builtin_library.transformProgram(program);
+    if (errors.isEmpty || dillTarget.isLoaded) {
+      setup_builtin_library.transformProgram(program);
+    }
     ticker.logMs("Linked program");
     return program;
   }
 
   Future<Program> writeLinkedProgram(Uri uri, Program program,
       {bool isFullProgram}) async {
     File output = new File.fromUri(uri);
     IOSink sink = output.openWrite();
     try {
       new BinaryPrinter(sink).writeProgramFile(program);
@@ skipping 250 matching lines @@
     superclass = superclass.superclass;
   }
   for (Constructor constructor in superclass.constructors) {
     if (constructor.name.name.isEmpty) {
       return constructor.function.requiredParameterCount == 0 ?
           constructor : null;
     }
   }
   return null;
 }