Issue 2081: Expose function's (closure's) inner context in debugger.

test/mjsunit/harmony/debug-function-scopes.js

+// Copyright 2012 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:
+//
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+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
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+//       with the distribution.
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+//       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 --harmony-scoping
+
+"use strict";
+
+// Get the Debug object exposed from the debug context global object.
+var Debug = debug.Debug;
+
+function CheckScope(scope_mirror, scope_expectations, expected_scope_type) {
+  assertEquals(expected_scope_type, scope_mirror.scopeType());
+
+  var scope_object = scope_mirror.scopeObject().value();
+
+  for (let name in scope_expectations) {
+    let actual = scope_object[name];
+    let expected = scope_expectations[name];
+    assertEquals(expected, actual);
+  }
+}
+
+// A copy of the scope types from mirror-debugger.js.
+var ScopeType = { Global: 0,
+                  Local: 1,
+                  With: 2,
+                  Closure: 3,
+                  Catch: 4,
+                  Block: 5 };
+
+var f1 = (function F1(x) {
+  function F2(y) {
+    var z = x + y;
+    {
+      var w =  5;
+      var v = "Capybara";
+      var F3 = function(a, b) {
+        function F4(p) {
+          return p + a + b + z + w + v.length;
+        }
+        return F4;
+      }
+      return F3(4, 5);
+    }
+  }
+  return F2(17);
+})(5);
+
+var mirror = Debug.MakeMirror(f1);
+
+assertEquals(4, mirror.scopeCount());
+
+CheckScope(mirror.scope(0), { a: 4, b: 5 }, ScopeType.Closure);
+CheckScope(mirror.scope(1), { z: 22, w: 5, v: "Capybara" }, ScopeType.Closure);
+CheckScope(mirror.scope(2), { x: 5 }, ScopeType.Closure);
+CheckScope(mirror.scope(3), {}, ScopeType.Global);
+
+var f2 = (function() {
+  var v1 = 3;
+  var v2 = 4;
+  let l0 = 0;
+  {
+    var v3 = 5;
+    let l1 = 6;
+    let l2 = 7;
+    {
+      var v4 = 8;
+      let l3 = 9;
+      {
+        var v5 = "Cat";
+        let l4 = 11;
+        var v6 = l4;
+        return function() {
+          return l0 + v1 + v3 + l2 + l3 + v6;
+        };
+      }
+    }
+  }
+})();
+
+var mirror = Debug.MakeMirror(f2);
+
+assertEquals(5, mirror.scopeCount());
+
+// Implementation artifact: l4 isn't used in closure, but still it is saved.
+CheckScope(mirror.scope(0), { l4: 11 }, ScopeType.Block);
+
+CheckScope(mirror.scope(1), { l3: 9 }, ScopeType.Block);
+CheckScope(mirror.scope(2), { l1: 6, l2: 7 }, ScopeType.Block);
+CheckScope(mirror.scope(3), { v1:3, l0: 0, v3: 5, v6: 11 }, ScopeType.Closure);
+CheckScope(mirror.scope(4), {}, ScopeType.Global);