Implement generator mirror

test/mjsunit/es6/generator-mirror.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-debug-as debug
+// Test the mirror object for functions.
+
+function *generator(f) {
+  "use strict";
+  yield;
+  f();
+  yield;
+}
+
+function MirrorRefCache(json_refs) {
+  var tmp = eval('(' + json_refs + ')');
+  this.refs_ = [];
+  for (var i = 0; i < tmp.length; i++) {
+    this.refs_[tmp[i].handle] = tmp[i];
+  }
+}
+
+MirrorRefCache.prototype.lookup = function(handle) {
+  return this.refs_[handle];
+}
+
+function TestGeneratorMirror(g, test) {
+  // Create mirror and JSON representation.
+  var mirror = debug.MakeMirror(g);
+  var serializer = debug.MakeMirrorSerializer();
+  var json = JSON.stringify(serializer.serializeValue(mirror));
+  var refs = new MirrorRefCache(
+      JSON.stringify(serializer.serializeReferencedObjects()));
+
+  // Check the mirror hierachy.
+  assertTrue(mirror instanceof debug.Mirror);
+  assertTrue(mirror instanceof debug.ValueMirror);
+  assertTrue(mirror instanceof debug.ObjectMirror);
+  assertTrue(mirror instanceof debug.GeneratorMirror);
+
+  // Check the mirror properties.
+  assertTrue(mirror.isGenerator());
+  assertEquals('generator', mirror.type());
+  assertFalse(mirror.isPrimitive());
+  assertEquals("Generator", mirror.className());
+
+  assertTrue(mirror.receiver().isUndefined());
+  assertEquals(mirror.func().value(), generator);

[aandrey, 2014/09/17 13:21:30]

will mirror.func().scope() return valid scopes for a suspended generator?

[wingo, 2014/09/17 13:54:30]

Yes, because func().scope() is the scope captured by a function, not the scope
of the suspended activation.

+  assertTrue(mirror.context().isContext());
+
+  test(mirror);
+}
+
+var iter = generator(function () {})
+
+// Note that line numbers are 0-based, not 1-based.
+function assertSourceLocation(loc, line, column) {
+  assertEquals(line, loc.line);
+  assertEquals(column, loc.column);
+}
+
+TestGeneratorMirror(iter, function (mirror) {
+  assertEquals(mirror.status(), "suspended")
+  assertSourceLocation(mirror.sourceLocation(), 7, 19);
+});
+
+iter.next();
+TestGeneratorMirror(iter, function (mirror) {
+  assertEquals(mirror.status(), "suspended")
+  assertSourceLocation(mirror.sourceLocation(), 9, 2);
+});
+
+iter.next();
+TestGeneratorMirror(iter, function (mirror) {
+  assertEquals(mirror.status(), "suspended")
+  assertSourceLocation(mirror.sourceLocation(), 11, 2);
+});
+
+iter.next();
+TestGeneratorMirror(iter, function (mirror) {
+  assertEquals(mirror.status(), "closed")
+  assertEquals(mirror.sourceLocation(), undefined);
+});