harmony-scoping: Implement debugger support for script scope.

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:
 //
 //     * 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
@@ skipping 10 matching lines @@
 // 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";
+let top_level_let = 255;
 
 // 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 };
+                  Block: 5,
+                  Script: 6};
 
 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());
+assertEquals(5, 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);
+CheckScope(mirror.scope(3), { top_level_let: 255 }, ScopeType.Script);
+CheckScope(mirror.scope(4), {}, 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());
+assertEquals(6, 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);
+CheckScope(mirror.scope(4), { top_level_let: 255 }, ScopeType.Script);
+CheckScope(mirror.scope(5), {}, ScopeType.Global);