Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/test/mjsunit/debug-referenced-by.js b/test/mjsunit/debug-referenced-by.js
new file mode 100644
index 0000000..915a0c7
--- /dev/null
+++ b/test/mjsunit/debug-referenced-by.js
@@ -0,0 +1,112 @@
+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --expose-debug-as debug
+// Get the Debug object exposed from the debug context global object.
+Debug = debug.Debug
+
+// Simple object.
+var a = {};
+
+// Create mirror for the object.
+var mirror = debug.MakeMirror(a);
+
+// Initially one reference from the global object.
+assertEquals(1, mirror.referencedBy().length);
+assertEquals(1, mirror.referencedBy(0).length);
+assertEquals(1, mirror.referencedBy(1).length);
+assertEquals(1, mirror.referencedBy(10).length);
+
+// Add some more references from simple objects and arrays.
+var b = {}
+b.a = a;
+assertEquals(2, mirror.referencedBy().length);
+var c = {}
+c.a = a;
+c.aa = a;
+c.aaa = a;
+assertEquals(3, mirror.referencedBy().length);
+function d(){};
+d.a = a
+assertEquals(4, mirror.referencedBy().length);
+e = [a,b,c,d];
+assertEquals(5, mirror.referencedBy().length);
+
+
+// Simple closure.
+function closure_simple(p) {
+ return function() { p = null; };
+}
+
+// This adds a reference (function context).
+f = closure_simple(a);
+assertEquals(6, mirror.referencedBy().length);
+// This clears the reference (in function context).
+f()
+assertEquals(5, mirror.referencedBy().length);
+
+// Use closure with eval - creates arguments array.
+function closure_eval(p, s) {
+ if (s) {
+ eval(s);
+ }
+ return function e(s) { eval(s); };
+}
+
+// This adds a references (function context).
+g = closure_eval(a);
+assertEquals(6, mirror.referencedBy().length);
+
+// Dynamically create a variable. This should create a context extension.
+h = closure_eval(null, "var x_");
+assertEquals(6, mirror.referencedBy().length);
+// Adds a reference when set.
+h("x_ = a");
+var x = mirror.referencedBy();
+assertEquals(7, mirror.referencedBy().length);
+// Removes a reference when cleared.
+h("x_ = null");
+assertEquals(6, mirror.referencedBy().length);
+
+// Check circular references.
+x = {}
+mirror = debug.MakeMirror(x);
+assertEquals(1, mirror.referencedBy().length);
+x.x = x;
+assertEquals(2, mirror.referencedBy().length);
+x = null;
+assertEquals(0, mirror.referencedBy().length);
+
+// Check many references.
+y = {}
+mirror = debug.MakeMirror(y);
+refs = [];
+for (var i = 0; i < 200; i++) {
+ refs[i] = {'y': y};
+}
+y = null;
+assertEquals(200, mirror.referencedBy().length);