tests/compiler/dart2js/mirror_helper_unique_minification_test.dart

// 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.

import "package:expect/expect.dart";
import 'dart:async';
import "package:async_helper/async_helper.dart";
import 'memory_compiler.dart' show compilerFor;
import '../../../sdk/lib/_internal/compiler/implementation/apiimpl.dart' show
    Compiler;
import
    '../../../sdk/lib/_internal/compiler/implementation/dart_backend/dart_backend.dart'
show
    DartBackend;
import
    '../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart'
show
    Node, Identifier;
import
    '../../../sdk/lib/_internal/compiler/implementation/mirror_renamer/mirror_renamer.dart'
show
    MirrorRenamer;

main() {
  testUniqueMinification();
  testNoUniqueMinification();
}

Future<Compiler> runCompiler({useMirrorHelperLibrary: false, minify: false}) {
  List<String> options = ['--output-type=dart'];
  if (minify) {
    options.add('--minify');
  }
  Compiler compiler = compilerFor(MEMORY_SOURCE_FILES, options: options);
  DartBackend backend = compiler.backend;
  backend.useMirrorHelperLibrary = useMirrorHelperLibrary;
  return
      compiler.runCompiler(Uri.parse('memory:main.dart')).then((_) => compiler);
}

void testUniqueMinification() {
  asyncTest(() => runCompiler(useMirrorHelperLibrary: true, minify: true).
      then((Compiler compiler) {
    DartBackend backend = compiler.backend;
    MirrorRenamer mirrorRenamer = backend.mirrorRenamer;
    Map<Node, String> renames = backend.renames;
    Map<String, String> symbols = mirrorRenamer.symbols;

    // Check that no two different source code names get the same mangled name,
    // with the exception of MirrorSystem.getName that gets renamed to the same
    // mangled name as the getNameHelper from _mirror_helper.dart.
    for (Node node in renames.keys) {
      Identifier identifier = node.asIdentifier();
      if (identifier != null) {
        String source = identifier.source;
        if (mirrorRenamer.mirrorSystemGetNameNodes.first.selector == node)
          continue;
        if (symbols.containsKey(renames[node])) {
          print(node);
          Expect.equals(source, symbols[renames[node]]);
        }
      }
    }
  }));
}

void testNoUniqueMinification() {
  asyncTest(() => runCompiler(useMirrorHelperLibrary: false, minify: true).
      then((Compiler compiler) {
    DartBackend backend = compiler.backend;
    Map<Node, String> renames = backend.renames;

    // 'Foo' appears twice and 'invocation' and 'hest' get the same mangled
    // name.
    Expect.equals(renames.values.toSet().length, renames.values.length - 2);
  }));
}

const MEMORY_SOURCE_FILES = const <String, String> {
  'main.dart': """
import 'dart:mirrors';

class Foo {
  noSuchMethod(invocation) {
    MirrorSystem.getName(null);
  }
}

main() {
  new Foo().fisk();
  var hest;
}
"""};