Support unittest of jumps

tests/compiler/dart2js/jumps/jump_test.dart

+// 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.
+
+import 'dart:io';
+import 'package:async_helper/async_helper.dart';
+import 'package:compiler/src/common.dart';
+import 'package:compiler/src/compiler.dart';
+import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
+import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/elements/entities.dart';
+import 'package:compiler/src/elements/jumps.dart';
+import 'package:compiler/src/js_model/locals.dart';
+import 'package:compiler/src/kernel/element_map.dart';
+import 'package:compiler/src/kernel/kernel_backend_strategy.dart';
+import 'package:compiler/src/tree/nodes.dart' as ast;
+import '../equivalence/id_equivalence.dart';
+import '../equivalence/id_equivalence_helper.dart';
+import 'package:kernel/ast.dart' as ir;
+
+main() {
+  asyncTest(() async {
+    Directory dataDir = new Directory.fromUri(Platform.script.resolve('data'));
+    await for (FileSystemEntity entity in dataDir.list()) {
+      print('Checking ${entity.uri}');
+      String annotatedCode = await new File.fromUri(entity.uri).readAsString();
+      await checkCode(annotatedCode, computeJumpsData, compileFromSource);
+      await checkCode(annotatedCode, computeKernelJumpsData, compileFromDill);
+    }
+  });
+}
+
+/// Compute closure data mapping for [_member] as a [MemberElement].
+///
+/// Fills [actualMap] with the data and [sourceSpanMap] with the source spans
+/// for the data origin.
+void computeJumpsData(
+    Compiler compiler, MemberEntity _member, Map<Id, ActualData> actualMap,
+    {bool verbose: false}) {
+  MemberElement member = _member;
+  new JumpsAstComputer(compiler.reporter, actualMap, member.resolvedAst).run();
+}
+
+/// Compute closure data mapping for [member] as a kernel based element.
+///
+/// Fills [actualMap] with the data and [sourceSpanMap] with the source spans
+/// for the data origin.
+void computeKernelJumpsData(
+    Compiler compiler, MemberEntity member, Map<Id, ActualData> actualMap,
+    {bool verbose: false}) {
+  KernelBackendStrategy backendStrategy = compiler.backendStrategy;
+  KernelToElementMapForBuilding elementMap = backendStrategy.elementMap;
+  GlobalLocalsMap localsMap = backendStrategy.globalLocalsMapForTesting;
+  MemberDefinition definition = elementMap.getMemberDefinition(member);
+  new JumpsIrChecker(
+          actualMap, elementMap, member, localsMap.getLocalsMap(member))
+      .run(definition.node);
+}
+
+class TargetData {
+  final int index;
+  final NodeId id;
+  final SourceSpan sourceSpan;
+  final JumpTarget target;
+
+  TargetData(this.index, this.id, this.sourceSpan, this.target);
+}
+
+class GotoData {
+  final NodeId id;
+  final SourceSpan sourceSpan;
+  final JumpTarget target;
+
+  GotoData(this.id, this.sourceSpan, this.target);
+}
+
+abstract class JumpsMixin implements ComputerMixin {
+  int index = 0;
+  Map<JumpTarget, TargetData> targets = <JumpTarget, TargetData>{};
+  List<GotoData> gotos = <GotoData>[];
+
+  void processData() {
+    targets.forEach((JumpTarget target, TargetData data) {
+      StringBuffer sb = new StringBuffer();
+      sb.write(data.index);
+      sb.write('@');
+      bool needsComma = false;
+      if (target.isBreakTarget) {
+        sb.write('break');
+        needsComma = true;
+      }
+      if (target.isContinueTarget) {
+        if (needsComma) {
+          sb.write(',');
+        }
+        sb.write('continue');
+        needsComma = true;
+      }
+      String value = sb.toString();
+      registerValue(data.sourceSpan, data.id, value, target);
+    });
+    gotos.forEach((GotoData data) {
+      StringBuffer sb = new StringBuffer();
+      sb.write('target=');
+      TargetData targetData = targets[data.target];
+      sb.write(targetData.index);
+      String value = sb.toString();
+      registerValue(data.sourceSpan, data.id, value, data);
+    });
+  }
+}
+
+/// Ast visitor for computing jump data.
+class JumpsAstComputer extends AbstractResolvedAstComputer with JumpsMixin {
+  JumpsAstComputer(DiagnosticReporter reporter, Map<Id, ActualData> actualMap,
+      ResolvedAst resolvedAst)
+      : super(reporter, actualMap, resolvedAst);
+
+  void run() {
+    super.run();
+    processData();
+  }
+
+  @override
+  String computeNodeValue(ast.Node node, [AstElement element]) {
+    // Node values are computed post-visit in [processData].
+    return null;
+  }
+
+  @override
+  String computeElementValue(AstElement element) {
+    return null;
+  }
+
+  @override
+  visitLoop(ast.Loop node) {
+    JumpTarget target = elements.getTargetDefinition(node);
+    if (target != null) {
+      NodeId id = computeLoopNodeId(node);
+      SourceSpan sourceSpan = computeSourceSpan(node);
+      targets[target] = new TargetData(index++, id, sourceSpan, target);
+    }
+    super.visitLoop(node);
+  }
+
+  @override
+  visitGotoStatement(ast.GotoStatement node) {
+    JumpTarget target = elements.getTargetOf(node);
+    NodeId id = computeGotoNodeId(node);
+    SourceSpan sourceSpan = computeSourceSpan(node);
+    gotos.add(new GotoData(id, sourceSpan, target));
+    super.visitGotoStatement(node);
+  }
+}
+
+/// Kernel IR visitor for computing jump data.
+class JumpsIrChecker extends AbstractIrComputer with JumpsMixin {
+  final KernelToLocalsMap _localsMap;
+
+  JumpsIrChecker(Map<Id, ActualData> actualMap, KernelToElementMap elementMap,
+      MemberEntity member, this._localsMap)
+      : super(actualMap);
+
+  void run(ir.Node root) {
+    super.run(root);
+    processData();
+  }
+
+  @override
+  String computeNodeValue(ir.Node node) {
+    // Node values are computed post-visit in [processData].
+    return null;
+  }
+
+  @override
+  String computeMemberValue(ir.Member member) {
+    return null;
+  }
+
+  visitForStatement(ir.ForStatement node) {
+    JumpTarget target = _localsMap.getJumpTargetForFor(node);
+    if (target != null) {
+      NodeId id = computeLoopNodeId(node);
+      SourceSpan sourceSpan = computeSourceSpan(node);
+      targets[target] = new TargetData(index++, id, sourceSpan, target);
+    }
+    super.visitForStatement(node);
+  }
+
+  // TODO(johnniwinther): Support testing of do, for-in and while loops.
+
+  visitBreakStatement(ir.BreakStatement node) {
+    JumpTarget target = _localsMap.getJumpTargetForBreak(node);
+    assert(target != null, 'No target for $node.');
+    NodeId id = computeGotoNodeId(node);
+    SourceSpan sourceSpan = computeSourceSpan(node);
+    gotos.add(new GotoData(id, sourceSpan, target));
+    super.visitBreakStatement(node);
+  }
+}