Native context: debug.js does not load from js builtins object anymore.

src/prologue.js

 // Copyright 2015 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.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -----------------------------------------------------------------------
 // Utils
 
 var imports = UNDEFINED;
-var exports = UNDEFINED;
 var imports_from_experimental = UNDEFINED;
 var exports_to_runtime = UNDEFINED;
+var exports_container = {};
 
 // Export to other scripts.
 // In normal natives, this exports functions to other normal natives.
 // In experimental natives, this exports to other experimental natives and
 // to normal natives that import using utils.ImportFromExperimental.
 function Export(f) {
-  f.next = exports;
-  exports = f;
+  f(exports_container);
 }
 
 
 // Export to the native context for calls from the runtime.
 function ExportToRuntime(f) {
   f.next = exports_to_runtime;
   exports_to_runtime = f;
 }
 
-// Import from other scripts.
+
+// Import from other scripts. The actual importing happens in PostNatives and
+// PostExperimental so that we can import from scripts executed later. However,
+// that means that the import is not available until the very end. If the
+// import needs to be available immediate, use ImportNow.
 // In normal natives, this imports from other normal natives.
 // In experimental natives, this imports from other experimental natives and
 // whitelisted exports from normal natives.
 function Import(f) {
   f.next = imports;
   imports = f;
 }
 
+// Import immediately from exports of previous scripts. We need this for
+// functions called during bootstrapping. Hooking up imports in PostNatives
+// would be too late.
+function ImportNow(f) {
+  f(exports_container);
+}
+
 
 // In normal natives, import from experimental natives.
 // Not callable from experimental natives.
 function ImportFromExperimental(f) {
   f.next = imports_from_experimental;
   imports_from_experimental = f;
 }
 
 
 function SetFunctionName(f, name, prefix) {
@@ skipping 88 matching lines @@
     %AddNamedProperty(prototype, key, f, DONT_ENUM | DONT_DELETE | READ_ONLY);
     %SetNativeFlag(f);
   }
   %InternalSetPrototype(prototype, null);
   %ToFastProperties(prototype);
 }
 
 // -----------------------------------------------------------------------
 // To be called by bootstrapper
 
-var experimental_exports = UNDEFINED;
-
 function PostNatives(utils) {
   %CheckIsBootstrapping();
 
-  var container = {};
-  for ( ; !IS_UNDEFINED(exports); exports = exports.next) exports(container);
-  for ( ; !IS_UNDEFINED(imports); imports = imports.next) imports(container);
+  for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
+    imports(exports_container);
+  }
 
   var runtime_container = {};
   for ( ; !IS_UNDEFINED(exports_to_runtime);
           exports_to_runtime = exports_to_runtime.next) {
     exports_to_runtime(runtime_container);
   }
   %ImportToRuntime(runtime_container);
 
-  // Whitelist of exports from normal natives to experimental natives.
-  var expose_to_experimental = [
+  // Whitelist of exports from normal natives to experimental natives and debug.
+  var expose_list = [
     "ArrayToString",
+    "FunctionSourceString",
     "GetIterator",
     "GetMethod",
     "InnerArrayEvery",
     "InnerArrayFilter",
     "InnerArrayForEach",
     "InnerArrayIndexOf",
     "InnerArrayJoin",
     "InnerArrayLastIndexOf",
     "InnerArrayMap",
     "InnerArrayReduce",
     "InnerArrayReduceRight",
     "InnerArrayReverse",
     "InnerArraySome",
     "InnerArraySort",
     "InnerArrayToLocaleString",
     "IsNaN",
     "MathMax",
     "MathMin",
     "ObjectIsFrozen",
     "ObjectDefineProperty",
     "OwnPropertyKeys",
     "ToNameArray",
+    "ToBoolean",
+    "ToNumber",
+    "ToString",
   ];
-  experimental_exports = {};
+
+  var filtered_exports = {};
   %OptimizeObjectForAddingMultipleProperties(
-      experimental_exports, expose_to_experimental.length);
-  for (var key of expose_to_experimental) {
-    experimental_exports[key] = container[key];
+      filtered_exports, expose_list.length);
+  for (var key of expose_list) {
+    filtered_exports[key] = exports_container[key];
   }
-  %ToFastProperties(experimental_exports);
-  container = UNDEFINED;
+  %ToFastProperties(filtered_exports);
+  exports_container = filtered_exports;
 
   utils.PostNatives = UNDEFINED;
   utils.ImportFromExperimental = UNDEFINED;
 }
 
 
 function PostExperimentals(utils) {
   %CheckIsBootstrapping();
 
-  for ( ; !IS_UNDEFINED(exports); exports = exports.next) {
-    exports(experimental_exports);
-  }
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
-    imports(experimental_exports);
+    imports(exports_container);
   }
   for ( ; !IS_UNDEFINED(imports_from_experimental);
           imports_from_experimental = imports_from_experimental.next) {
-    imports_from_experimental(experimental_exports);
+    imports_from_experimental(exports_container);
   }
   var runtime_container = {};
   for ( ; !IS_UNDEFINED(exports_to_runtime);
           exports_to_runtime = exports_to_runtime.next) {
     exports_to_runtime(runtime_container);
   }
   %ImportExperimentalToRuntime(runtime_container);
 
-  experimental_exports = UNDEFINED;
+  exports_container = UNDEFINED;
 
   utils.PostExperimentals = UNDEFINED;
   utils.PostDebug = UNDEFINED;
   utils.Import = UNDEFINED;
   utils.Export = UNDEFINED;
 }
 
 
 function PostDebug(utils) {
-  for ( ; !IS_UNDEFINED(exports); exports = exports.next) {
-    exports(experimental_exports);
+  for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
+    imports(exports_container);
   }
-  for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
-    imports(experimental_exports);
-  }
+
+  exports_container = UNDEFINED;
 
   utils.PostDebug = UNDEFINED;
   utils.PostExperimentals = UNDEFINED;
   utils.Import = UNDEFINED;
   utils.Export = UNDEFINED;
 }
 
 // -----------------------------------------------------------------------
 
-%OptimizeObjectForAddingMultipleProperties(utils, 13);
+%OptimizeObjectForAddingMultipleProperties(utils, 14);
 
 utils.Import = Import;
+utils.ImportNow = ImportNow;
 utils.Export = Export;
 utils.ExportToRuntime = ExportToRuntime;
 utils.ImportFromExperimental = ImportFromExperimental;
 utils.SetFunctionName = SetFunctionName;
 utils.InstallConstants = InstallConstants;
 utils.InstallFunctions = InstallFunctions;
 utils.InstallGetter = InstallGetter;
 utils.InstallGetterSetter = InstallGetterSetter;
 utils.SetUpLockedPrototype = SetUpLockedPrototype;
 utils.PostNatives = PostNatives;
 utils.PostExperimentals = PostExperimentals;
 utils.PostDebug = PostDebug;
 
 %ToFastProperties(utils);
 
 })