use sourceAndMap is available

lib/EvalSourceMapDevToolModuleTemplatePlugin.js

@@ -17,9 +17,15 @@ EvalSourceMapDevToolModuleTemplatePlugin.prototype.apply = function(moduleTempla
 	moduleTemplate.plugin("module", function(source, module, chunk) {
 		if(source.__EvalSourceMapDevTool_Data)
 			return source.__EvalSourceMapDevTool_Data;
-		var content = source.source();
 
+		if(source.sourceAndMap) {
+			var sourceAndMap = source.sourceAndMap();
+			var sourceMap = sourceAndMap.map;
+			var content = sourceAndMap.source;
+		} else {
 			var sourceMap = source.map();
+			var content = source.source();
+		}
 		if(!sourceMap) {
 			return source;
 		}

lib/SourceMapDevToolPlugin.js

@@ -63,12 +63,22 @@ SourceMapDevToolPlugin.prototype.apply = function(compiler) {
 						}
 						return;
 					}
+					if(asset.sourceAndMap) {
+						var sourceAndMap = asset.sourceAndMap();
+						var sourceMap = sourceAndMap.map;
+						var source = sourceAndMap.source;
+					} else {
 						var sourceMap = asset.map();
+						var source = asset.source();
+					}
+					if(!sourceMap.sources)
+						console.log(asset, sourceMap, asset.constructor);
 					if(sourceMap) {
 						return {
 							chunk: chunk,
 							file: file,
 							asset: asset,
+							source: source,
 							sourceMap: sourceMap
 						}
 					}
@@ -112,6 +122,7 @@ SourceMapDevToolPlugin.prototype.apply = function(compiler) {
 				var file = task.file;
 				var asset = task.asset;
 				var sourceMap = task.sourceMap;
+				var source = task.source;
 				var moduleFilenames = task.moduleFilenames;
 				var modules = task.modules;
 				sourceMap.sources = moduleFilenames;
@@ -144,12 +155,12 @@ SourceMapDevToolPlugin.prototype.apply = function(compiler) {
 					});
 					var sourceMapUrl = path.relative(path.dirname(file), sourceMapFile).replace(/\\/g, "/");
 					if(currentSourceMappingURLComment !== false) {
-						asset.__SourceMapDevTool_Data[file] = this.assets[file] = new ConcatSource(asset, currentSourceMappingURLComment.replace(/\[url\]/g, sourceMapUrl));
+						asset.__SourceMapDevTool_Data[file] = this.assets[file] = new ConcatSource(new RawSource(source), currentSourceMappingURLComment.replace(/\[url\]/g, sourceMapUrl));
 					}
 					asset.__SourceMapDevTool_Data[sourceMapFile] = this.assets[sourceMapFile] = new RawSource(JSON.stringify(sourceMap));
 					chunk.files.push(sourceMapFile);
 				} else {
-					asset.__SourceMapDevTool_Data[file] = this.assets[file] = new ConcatSource(asset, currentSourceMappingURLComment
+					asset.__SourceMapDevTool_Data[file] = this.assets[file] = new ConcatSource(new RawSource(source), currentSourceMappingURLComment
 						.replace(/\[map\]/g, function() {
 							return JSON.stringify(sourceMap);
 						})

lib/dependencies/LoaderPlugin.js

@@ -32,8 +32,15 @@ LoaderPlugin.prototype.apply = function(compiler) {
 
 						if(dep.module.error) return callback(dep.module.error);
 						if(!dep.module._source) throw new Error("The module created for a LoaderDependency must have a property _source");
-						var map = dep.module._source.map();
+						var moduleSource = dep.module._source;
-						var source = dep.module._source.source();
+						if(moduleSource.sourceAndMap) {
+							var sourceAndMap = moduleSource.sourceAndMap();
+							var map = sourceAndMap.map;
+							var source = sourceAndMap.source;
+						} else {
+							var map = moduleSource.map();
+							var source = moduleSource.source();
+						}
 						if(dep.module.fileDependencies) {
 							dep.module.fileDependencies.forEach(function(dep) {
 								loaderContext.addDependency(dep);

lib/optimize/UglifyJsPlugin.js

@@ -46,13 +46,19 @@ UglifyJsPlugin.prototype.apply = function(compiler) {
 				var warnings = [];
 				try {
 					var asset = compilation.assets[file];
-					var input = asset.source();
 					if(asset.__UglifyJsPlugin) {
 						compilation.assets[file] = asset.__UglifyJsPlugin;
 						return;
 					}
 					if(options.sourceMap !== false) {
+						if(asset.sourceAndMap) {
+							var sourceAndMap = asset.sourceAndMap();
+							var inputSourceMap = sourceAndMap.map;
+							var input = sourceAndMap.source;
+						} else {
 							var inputSourceMap = asset.map();
+							var input = asset.source();
+						}
 						var sourceMap = new SourceMapConsumer(inputSourceMap);
 						uglify.AST_Node.warn_function = function(warning) {
 							var match = /\[.+:([0-9]+),([0-9]+)\]/.exec(warning);
@@ -67,6 +73,7 @@ UglifyJsPlugin.prototype.apply = function(compiler) {
 								"[" + requestShortener.shorten(original.source) + ":" + original.line + "," + original.column + "]");
 						};
 					} else {
+						var input = asset.source();
 						uglify.AST_Node.warn_function = function(warning) {
 							warnings.push(warning);
 						};
@@ -102,7 +109,7 @@ UglifyJsPlugin.prototype.apply = function(compiler) {
 					if(map) map = map + "";
 					stream = stream + "";
 					asset.__UglifyJsPlugin = compilation.assets[file] = (map ?
-						new SourceMapSource(stream, file, map, input, inputSourceMap) :
+						new SourceMapSource(stream, file, JSON.parse(map), input, inputSourceMap) :
 						new RawSource(stream));
 					if(warnings.length > 0) {
 						compilation.warnings.push(new Error(file + " from UglifyJs\n" + warnings.join("\n")));