Improve Dart Debugger performance and robustness by creating Dart wrappers using the standard SetNa…

Source/bindings/dart/DartDebugHooks.js

 /*
  * Copyright (C) 2012 Google Inc. 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
@@ skipping 14 matching lines @@
  * 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.
  */
 
 (function() {
 
 var DartDebug = {};
 
-function invokeDartCode(mirrorAPIFunction, proxy, memberName, args)
-{
-    var unwrappedArgs = [];
-    for (var i = 0; i < args.length; ++i)
-        unwrappedArgs.push(DartDebug.unwrapValue(args[i]));
-    var result = DartDebug.nativeCallbacks.invocationTrampoline(
-        mirrorAPIFunction, [proxy, memberName, unwrappedArgs]);
-    return DartDebug.wrapValue(result);
-}
-
 DartDebug.ExecutionState = function(callFrames)
 {
     this._callFrames = [];
     for (var i = 0; i < callFrames.length; ++i) {
         this._callFrames.push(new DartDebug.FrameMirror(callFrames[i]));
     }
 };
 
 DartDebug.ExecutionState.prototype = {
     frameCount: function()
@@ skipping 56 matching lines @@
     {
         return this.url;
     }
 };
 
 DartDebug.FrameMirror = function(callFrame)
 {
     this._functionName = callFrame.functionName;
     this._scriptId = DartDebug.scriptURLToScriptId[callFrame.scriptURL];
     this._lineNumber = callFrame.lineNumber;
-
-    var localScopeObject = {}
-    localScopeObject.__proto__ = null;
-
-    for (var i = 0; i < callFrame.localVariables.length; i += 2) {
-        var name = callFrame.localVariables[i];
-        var value = callFrame.localVariables[i + 1];
-        var suffixIndex = name.indexOf('@');
-        if (suffixIndex != -1)
-            name = name.substr(0, suffixIndex);
-        localScopeObject[name] = value;
-    }
-    this._localScope = new DartDebug.ScopeMirror(localScopeObject, ScopeType.Local);
-
-    var libraryScopeObject = DartDebug.buildLibraryScopeObject(callFrame.libraryProxy);
-    this._globalScope = new DartDebug.ScopeMirror(libraryScopeObject, ScopeType.Global);
+    this._localScope = new DartDebug.ScopeMirror(callFrame.localScopeProxy, ScopeType.Local);
+    this._globalScope = new DartDebug.ScopeMirror(callFrame.libraryProxy, ScopeType.Global);
 
     this._scopes = [this._localScope, this._globalScope];
 };
 
 DartDebug.FrameMirror.prototype = {
     func: function()
     {
         var self = this;
         return {
             name: function() { return self._functionName; },
@@ skipping 15 matching lines @@
     scope: function(index)
     {
         return this._scopes[index];
     },
 
     evaluate: function(expression, disableBreak)
     {
         // FIXME: Dart VM doesn't currently support evaluations. Use
         // JavaScript eval and 'with' statement to emulate evaluation on Dart
         // call frame.
-        var propertyMap = {};
-        var scopes = [this._globalScope, this._localScope];
-        for (var i = 0; i < scopes.length; ++i) {
-            var scopeObject = scopes[i]._object;
-            var propertyNames = Object.getOwnPropertyNames(scopeObject);
-            for (var j = 0; j < propertyNames.length; ++j) {
-                var name = propertyNames[j];
-                if (name !== 'this')
-                    propertyMap[name] = scopeObject[name];
-            }
-        }
 
         // FIXME: dartbug.com/10434 find a less fragile way to determine whether
         // we need to strip off console API support added by InjectedScript.
         var CONSOLE_API_SUPPORT_HEADER =
             'with ((window && window.console && window.console._commandLineAPI) || {}) {\n';
         if (expression.indexOf(CONSOLE_API_SUPPORT_HEADER) == 0) {
             expression = expression.substr(expression.indexOf('\n') + 1);
             expression = expression.substr(0, expression.lastIndexOf('\n'));
         }
-        var result = DartDebug.nativeCallbacks.evaluateInScope(expression, this._localScope.receiver(), propertyMap);
+
+        var result = DartDebug.nativeCallbacks.evaluateInScope(expression, this._localScope.receiver(),
+                this._globalScope._object, this._localScope._object);
         return { value: function() { return result; } };
     },
 
     get details_()
     {
         var receiver = this._localScope.receiver();
         return { receiver: function() { return receiver; } };
     }
 };
 
@@ skipping 65 matching lines @@
 
 DartDebug.unregisterIsolate = function(isolateHandle)
 {
     delete this.isolates[isolateHandle];
     if (Object.keys(this.isolates).length)
         return;
 
     // The page was destroyed.
     DartDebug.scripts = {};
     DartDebug.scriptURLToScriptId = {};
-
+    DartDebug.libraryScopeCache = {};
     DartDebug.breakpoints = {};
 };
 
 DartDebug.isolateLoaded = function(isolateHandle)
 {
     var isolateScripts = DartDebug.nativeCallbacks.scriptsForIsolate(isolateHandle);
     for (var i = 0; i < isolateScripts.length; ++i) {
         var script = DartDebug.registerScript(isolateHandle, isolateScripts[i]);
         if (!script)
             continue;
@@ skipping 32 matching lines @@
 
     return script;
 };
 
 DartDebug.updateExceptionPauseInfo = function()
 {
     for (var isolateHandle in DartDebug.isolates)
         DartDebug.nativeCallbacks.setExceptionPauseInfo(isolateHandle, Debug.isBreakOnException(), Debug.isBreakOnUncaughtException());
 }
 
-DartDebug.wrapValue = function(value)
-{
-    if (!value || !value.isProxy)
-        return value;
-    var wrapper = DartDebug.mirrorAPI.isList(value) ? DartDebug.wrapList(value) : DartDebug.wrapObject(value);
-    DartDebug.nativeCallbacks.setHiddenValue(wrapper, 'proxy', value);
-    return wrapper;
-}
-
-DartDebug.unwrapValue = function(value)
-{
-    var proxy = DartDebug.nativeCallbacks.getHiddenValue(value, 'proxy');
-    return proxy || value;
-}
-
-DartDebug.wrapList = function(arrayProxy)
-{
-    function getter(index)
-    {
-        return DartDebug.wrapValue(DartDebug.mirrorAPI.listGetAt(arrayProxy, index));
-    }
-
-    function setter(index, value)
-    {
-        DartDebug.mirrorAPI.listSetAt(arrayProxy, index, value);
-    }
-
-    function enumerator()
-    {
-        var indices = [];
-        var length = DartDebug.mirrorAPI.getField(arrayProxy, 'length');
-        for (var i = 0; i < length; ++i)
-            indices.push(i);
-        return indices;
-    }
-
-    var array = DartDebug.nativeCallbacks.createArrayWithIndexedPropertyHandler(getter, setter, enumerator);
-    array.length = DartDebug.mirrorAPI.getField(arrayProxy, 'length');
-    return array;
-}
-
-DartDebug.installProxyFieldsAndFunctions = function(proxy, getContainer, getContainerProxy,
-        filter, isLibrary, isClassDefinition)
-{
-
-    function shouldInstallProperty(container, name)
-    {
-        if (!container || name in container)
-            return false;
-        return filter ? filter(name) : true;
-    }
-
-    function setAccessor(name, descriptor, hasGetter, hasSetter)
-    {
-        var container = getContainer(descriptor.isStatic);
-        if (!shouldInstallProperty(container, name))
-            return;
-        var containerProxy = getContainerProxy(descriptor.isStatic);
-        var getter;
-        if (hasGetter) {
-            getter = function()
-            {
-                return invokeDartCode(DartDebug.mirrorAPI.getField, containerProxy, name, []);
-            };
-        }
-        var setter;
-        if (hasSetter) {
-            setter = function(value)
-            {
-                return invokeDartCode(DartDebug.mirrorAPI.setField, containerProxy, name, [value]);
-            };
-        }
-        DartDebug.nativeCallbacks.setAccessor(container, name, getter, setter);
-    }
-
-    function setFunction(name, descriptor)
-    {
-        var container = getContainer(descriptor.isStatic);
-        if (!shouldInstallProperty(container, name))
-            return;
-        var containerProxy = getContainerProxy(descriptor.isStatic);
-        function invoke()
-        {
-            if (arguments.length < descriptor.fixedParameterCount ||
-                arguments.length > descriptor.fixedParameterCount + descriptor.optionalParamerterCount)
-                throw "NoSuchMethodException: incorrect number of arguments passed to function named '" + name + "'";
-            return invokeDartCode(DartDebug.mirrorAPI.invoke, containerProxy, name, arguments);
-        }
-        Object.defineProperty(container, name, { value: invoke });
-    }
-
-    function setNamedConstructor(name, descriptor)
-    {
-        var container = getContainer(true);
-        var indexFirstDot = name.indexOf(".");
-        // Not a named constructor.
-        if (indexFirstDot == -1)
-            return;
-
-        var nameWithoutDot = name.substr(indexFirstDot + 1);
-        if (!shouldInstallProperty(container, nameWithoutDot))
-            return;
-        var containerProxy = getContainerProxy(descriptor.isStatic);
-        function invoke()
-        {
-            // FIXME: display the actual number of arguments and allowed range of number of arguments.
-            if (arguments.length < descriptor.fixedParameterCount ||
-                arguments.length > descriptor.fixedParameterCount + descriptor.optionalParamerterCount)
-                throw "NoSuchMethodException: incorrect number of arguments passed to constructor '" + nameWithoutDot + "'";
-            return invokeDartCode(DartDebug.mirrorAPI.dartNew, containerProxy, nameWithoutDot, arguments);
-        }
-        Object.defineProperty(container, nameWithoutDot, { value: invoke });
-    }
-
-    function setClass(name, descriptor)
-    {
-        var container = getContainer(true);
-        if (!shouldInstallProperty(container, name))
-            return;
-        var classProxy = DartDebug.createClassProxy(null, descriptor, name, proxy);
-        Object.defineProperty(container, name, { value: classProxy });
-    }
-
-    var variableNames = DartDebug.mirrorAPI.getVariableNames(proxy);
-    for (var i = 0; i < variableNames.length; ++i) {
-        var variableName = variableNames[i];
-        var variable = DartDebug.mirrorAPI.lookupVariable(proxy, variableName);
-        if (isClassDefinition && !variable.isStatic) continue;
-        setAccessor(variableName, variable, true, !variable.isFinal);
-    }
-
-    var functionNames = DartDebug.mirrorAPI.getFunctionNames(proxy);
-
-    var accessors = {};
-    for (var i = 0; i < functionNames.length; ++i) {
-        var functionName = functionNames[i];
-        var func = DartDebug.mirrorAPI.lookupFunction(proxy, functionName);
-        if (isClassDefinition && !func.isStatic && !func.isConstructor)
-            continue;
-
-        if (func.isAbstract)
-            continue;
-
-        if (func.isGetter) {
-            if (!accessors[functionName])
-                accessors[functionName] = {};
-            accessors[functionName].getter = func;
-        } else if (func.isSetter) {
-            // Remove trailing '='.
-            functionName = functionName.substr(0, functionName.length - 1);
-            if (!accessors[functionName])
-                accessors[functionName] = {};
-            accessors[functionName].setter = func;
-        } else if (!func.isConstructor) {
-            setFunction(functionName, func);
-        } else if (isClassDefinition && func.isConstructor){
-            setNamedConstructor(functionName, func);
-        }
-    }
-
-    if (isLibrary && !isClassDefinition) {
-        var classNames = DartDebug.mirrorAPI.getClassNames(proxy);
-        for (var i = 0; i < classNames.length; ++i) {
-            var className = classNames[i];
-            var clazz = DartDebug.mirrorAPI.lookupClass(proxy, className);
-            setClass(className, clazz);
-        }
-    }
-
-    for (var functionName in accessors) {
-        var accessor = accessors[functionName];
-        var func = accessor.getter || accessor.setter;
-        setAccessor(functionName, func, !!accessor.getter, !!accessor.setter);
-    }
-}
-
-DartDebug.wrapObject = function(objectProxy)
-{
-    var classProxy = DartDebug.mirrorAPI.instanceGetClass(objectProxy);
-    var className = DartDebug.mirrorAPI.className(classProxy);
-    return DartDebug.createClassProxy(objectProxy, classProxy, className);
-}
-
-DartDebug.createClassProxy = function(objectProxy, classProxy, className, opt_libraryProxy)
-{
-    // Create a fake constructor to set wrapper's class name.
-    var object;
-    if (objectProxy) {
-        // This is a class instance not a class definition object.
-        try {
-          fakeConstructor = eval('(function ' + className + '() {})');
-          object = new fakeConstructor();
-        } catch(e) {
-          object = {};
-        }
-        object.__proto__ = null;
-    } else {
-        // This is a class definition object.
-        // We need to wire up a default constructor if one exists.
-        // TODO(jacobr): there is some duplicated code here and for the named constructor case.
-        var myConstructor = null;
-        var functionNames = DartDebug.mirrorAPI.getFunctionNames(classProxy);
-        for (var i = 0; i < functionNames.length; ++i) {
-            var functionName = functionNames[i];
-            if (functionName != className)
-                continue;
-
-            var func = DartDebug.mirrorAPI.lookupFunction(classProxy, functionName);
-
-            if (func.isConstructor) {
-                myConstructor = func;
-                break;
-            }
-        }
-
-        var constructorStatement;
-        if (myConstructor != null) {
-            // FIXME: reduce duplicate code handling constructor invocation.
-            constructorStatement = '(function(invokeDartCode, DartDebug, classProxy, myConstructor) {' +
-                'return (function ' + className + '() {' +
-                    'if (arguments.length < myConstructor.fixedParameterCount || ' +
-                        'arguments.length > (myConstructor.fixedParameterCount + myConstructor.optionalParamerterCount)) ' +
-                        'throw "NoSuchMethodException: incorrect number of arguments passed to default constructor";' +
-                    'return invokeDartCode(DartDebug.mirrorAPI.dartNew, classProxy, "", arguments);' +
-                '})})';
-        } else {
-            // FIXME: throw a better error message.
-            constructorStatement = '(function() { return (function ' + className + '() { throw "' + className + ' does not have a constructor"})})';
-        }
-        try {
-          // FIXME: avoid using eval.
-          object = (eval(constructorStatement))(invokeDartCode, DartDebug, classProxy, myConstructor);
-        } catch(e) {
-          object = {};
-          object['@ERROR'] = e;
-          object['@SOURCE'] = constructorStatement;
-          object.__proto__ = null;
-        }
-        object.toString = function() { return className + " [Dart Class]"; };
-    }
-
-    var classInfo = {};
-    classInfo.__proto__ = null;
-    classInfo['class'] = className;
-    var libraryProxy = opt_libraryProxy || DartDebug.mirrorAPI.classGetLibrary(classProxy);
-    classInfo['library'] = DartDebug.mirrorAPI.libraryUrl(libraryProxy);
-    Object.defineProperty(object, '@classInfo', { value: classInfo });
-
-    var staticFields = objectProxy != null ? {} : object;
-    staticFields.__proto__ = null;
-
-    function getContainer(isStatic) { return isStatic ? staticFields : object; }
-    function getContainerProxy(isStatic) { return isStatic ? classProxy : objectProxy || classProxy; }
-
-    while (classProxy) {
-        DartDebug.installProxyFieldsAndFunctions(
-            classProxy, getContainer, getContainerProxy, null, false, !objectProxy);
-        if (!objectProxy)
-            break; // Static methods from parent classes should not be wired up to subclasses.
-        classProxy = DartDebug.mirrorAPI.getSuperclass(classProxy);
-    }
-
-    if (objectProxy != null) {
-        Object.defineProperty(object, '@staticFields', { value: staticFields });
-    }
-
-    return object;
-}
-
-DartDebug.buildLibraryScopeObject = function(libraryProxy)
-{
-    var libraryScopeObject = {};
-    libraryScopeObject.__proto__ = null;
-
-    DartDebug.installProxyFieldsAndFunctions(
-        libraryProxy,
-        function() { return libraryScopeObject; },
-        function() { return libraryProxy; },
-        null,
-        true);
-
-    var imports = DartDebug.mirrorAPI.libraryImports(libraryProxy);
-    for (var i = 0; i < imports.length; i += 2) {
-        var prefix = imports[i];
-        var importedLibraryProxy = imports[i + 1];
-        var scopeObject = libraryScopeObject;
-        if (prefix) {
-            // Remove trailing '.'.
-            prefix = prefix.substr(0, prefix.length - 1);
-            // FIXME: remove the check below once dartbug.com/6131 is fixed.
-            if (!(prefix in libraryScopeObject)) {
-                scopeObject = {};
-                scopeObject.__proto__ = null;
-                Object.defineProperty(libraryScopeObject, prefix, { value: scopeObject });
-            }
-        }
-        var filter = function(name) { return name[0] != '_'; };
-        var getContainer = function() { return scopeObject};
-        var getContainerProxy = function() { return importedLibraryProxy};
-        DartDebug.installProxyFieldsAndFunctions(importedLibraryProxy, getContainer, getContainerProxy, filter, true);
-    }
-
-    return libraryScopeObject;
-}
-
 var originals = {};
 
 originals.scripts = Debug.scripts;
 
 Debug.scripts = function()
 {
     var scripts = originals.scripts.apply(Debug);
     for (var isolateHandle in DartDebug.isolates) {
         var isolateScripts = DartDebug.nativeCallbacks.scriptsForIsolate(isolateHandle);
         for (var i = 0; i < isolateScripts.length; ++i) {
@@ skipping 89 matching lines @@
 
 Debug.clearBreakOnUncaughtException = function()
 {
     originals.clearBreakOnUncaughtException.apply(Debug);
     DartDebug.updateExceptionPauseInfo();
 }
 
 return DartDebug;
 
 })()