Use native maps when they're available

Jakefile.js

@@ -57,6 +57,7 @@ function measure(marker) {
 }
 
 var compilerSources = [
+    "collections.ts",
     "core.ts",
     "performance.ts",
     "sys.ts",
@@ -93,6 +94,7 @@ var compilerSources = [
 });
 
 var servicesSources = [
+    "collections.ts",
     "core.ts",
     "performance.ts",
     "sys.ts",

scripts/processDiagnosticMessages.ts

@@ -27,7 +27,7 @@ function main(): void {
 
     var inputFilePath = sys.args[0].replace(/\\/g, "/");
     var inputStr = sys.readFile(inputFilePath);
-    
+
     var diagnosticMessages: InputDiagnosticMessageTable = JSON.parse(inputStr);
 
     var names = Utilities.getObjectKeys(diagnosticMessages);
@@ -44,7 +44,7 @@ function main(): void {
 function checkForUniqueCodes(messages: string[], diagnosticTable: InputDiagnosticMessageTable) {
     const originalMessageForCode: string[] = [];
     let numConflicts = 0;
-    
+
     for (const currentMessage of messages) {
         const code = diagnosticTable[currentMessage].code;
 
@@ -68,19 +68,19 @@ function checkForUniqueCodes(messages: string[], diagnosticTable: InputDiagnosti
     }
 }
 
-function buildUniqueNameMap(names: string[]): ts.Map<string> {
-    var nameMap = ts.createMap<string>();
+function buildUniqueNameMap(names: string[]): ts.Map<string, string> {
+    var nameMap = new ts.StringMap<string>();
 
     var uniqueNames = NameGenerator.ensureUniqueness(names, /* isCaseSensitive */ false, /* isFixed */ undefined);
 
     for (var i = 0; i < names.length; i++) {
-        nameMap[names[i]] = uniqueNames[i];
+        nameMap.set(names[i], uniqueNames[i]);
     }
 
     return nameMap;
 }
 
-function buildInfoFileOutput(messageTable: InputDiagnosticMessageTable, nameMap: ts.Map<string>): string {
+function buildInfoFileOutput(messageTable: InputDiagnosticMessageTable, nameMap: ts.Map<string, string>): string {
     var result =
         '// <auto-generated />\r\n' +
         '/// <reference path="types.ts" />\r\n' +
@@ -91,7 +91,7 @@ function buildInfoFileOutput(messageTable: InputDiagnosticMessageTable, nameMap:
     for (var i = 0; i < names.length; i++) {
         var name = names[i];
         var diagnosticDetails = messageTable[name];
-        var propName = convertPropertyName(nameMap[name]);
+        var propName = convertPropertyName(nameMap.get(name));
 
         result +=
         '        ' + propName +
@@ -107,14 +107,14 @@ function buildInfoFileOutput(messageTable: InputDiagnosticMessageTable, nameMap:
     return result;
 }
 
-function buildDiagnosticMessageOutput(messageTable: InputDiagnosticMessageTable, nameMap: ts.Map<string>): string {
+function buildDiagnosticMessageOutput(messageTable: InputDiagnosticMessageTable, nameMap: ts.Map<string, string>): string {
     var result =
         '{';
     var names = Utilities.getObjectKeys(messageTable);
     for (var i = 0; i < names.length; i++) {
         var name = names[i];
         var diagnosticDetails = messageTable[name];
-        var propName = convertPropertyName(nameMap[name]);
+        var propName = convertPropertyName(nameMap.get(name));
 
         result += '\r\n  "' + createKey(propName, diagnosticDetails.code) + '"' + ' : "' + name.replace(/[\"]/g, '\\"') + '"';
         if (i !== names.length - 1) {

src/compiler/binder.ts

@@ -128,7 +128,7 @@ namespace ts {
 
         let symbolCount = 0;
         let Symbol: { new (flags: SymbolFlags, name: string): Symbol };
-        let classifiableNames: Map<string>;
+        let classifiableNames: Set<string>;
 
         const unreachableFlow: FlowNode = { flags: FlowFlags.Unreachable };
         const reportedUnreachableFlow: FlowNode = { flags: FlowFlags.Unreachable };
@@ -142,7 +142,7 @@ namespace ts {
             options = opts;
             languageVersion = getEmitScriptTarget(options);
             inStrictMode = bindInStrictMode(file, opts);
-            classifiableNames = createMap<string>();
+            classifiableNames = new StringSet();
             symbolCount = 0;
             skipTransformFlagAggregation = isDeclarationFile(file);
 
@@ -202,11 +202,11 @@ namespace ts {
             symbol.declarations.push(node);
 
             if (symbolFlags & SymbolFlags.HasExports && !symbol.exports) {
-                symbol.exports = createMap<Symbol>();
+                symbol.exports = new StringMap<Symbol>();
             }
 
             if (symbolFlags & SymbolFlags.HasMembers && !symbol.members) {
-                symbol.members = createMap<Symbol>();
+                symbol.members = new StringMap<Symbol>();
             }
 
             if (symbolFlags & SymbolFlags.Value) {
@@ -344,17 +344,17 @@ namespace ts {
                 // Otherwise, we'll be merging into a compatible existing symbol (for example when
                 // you have multiple 'vars' with the same name in the same container).  In this case
                 // just add this node into the declarations list of the symbol.
-                symbol = symbolTable[name] || (symbolTable[name] = createSymbol(SymbolFlags.None, name));
+                symbol = getOrUpdate(symbolTable, name, name => createSymbol(SymbolFlags.None, name));
 
                 if (name && (includes & SymbolFlags.Classifiable)) {
-                    classifiableNames[name] = name;
+                    classifiableNames.add(name);
                 }
 
                 if (symbol.flags & excludes) {
                     if (symbol.isReplaceableByMethod) {
                         // Javascript constructor-declared symbols can be discarded in favor of
                         // prototype symbols like methods.
-                        symbol = symbolTable[name] = createSymbol(SymbolFlags.None, name);
+                        symbol = setAndReturn(symbolTable, name, createSymbol(SymbolFlags.None, name));
                     }
                     else {
                         if (node.name) {
@@ -475,7 +475,7 @@ namespace ts {
             if (containerFlags & ContainerFlags.IsContainer) {
                 container = blockScopeContainer = node;
                 if (containerFlags & ContainerFlags.HasLocals) {
-                    container.locals = createMap<Symbol>();
+                    container.locals = new StringMap<Symbol>();
                 }
                 addToContainerChain(container);
             }
@@ -1516,8 +1516,7 @@ namespace ts {
 
             const typeLiteralSymbol = createSymbol(SymbolFlags.TypeLiteral, "__type");
             addDeclarationToSymbol(typeLiteralSymbol, node, SymbolFlags.TypeLiteral);
-            typeLiteralSymbol.members = createMap<Symbol>();
-            typeLiteralSymbol.members[symbol.name] = symbol;
+            typeLiteralSymbol.members = new StringMap([[symbol.name, symbol]]);
         }
 
         function bindObjectLiteralExpression(node: ObjectLiteralExpression) {
@@ -1527,7 +1526,7 @@ namespace ts {
             }
 
             if (inStrictMode) {
-                const seen = createMap<ElementKind>();
+                const seen = new StringMap<ElementKind>();
 
                 for (const prop of node.properties) {
                     if (prop.name.kind !== SyntaxKind.Identifier) {
@@ -1548,9 +1547,9 @@ namespace ts {
                         ? ElementKind.Property
                         : ElementKind.Accessor;
 
-                    const existingKind = seen[identifier.text];
+                    const existingKind = seen.get(identifier.text);
                     if (!existingKind) {
-                        seen[identifier.text] = currentKind;
+                        seen.set(identifier.text, currentKind);
                         continue;
                     }
 
@@ -1583,7 +1582,7 @@ namespace ts {
                 // fall through.
                 default:
                     if (!blockScopeContainer.locals) {
-                        blockScopeContainer.locals = createMap<Symbol>();
+                        blockScopeContainer.locals = new StringMap<Symbol>();
                         addToContainerChain(blockScopeContainer);
                     }
                     declareSymbol(blockScopeContainer.locals, undefined, node, symbolFlags, symbolExcludes);
@@ -2048,7 +2047,7 @@ namespace ts {
                 }
             }
 
-            file.symbol.globalExports = file.symbol.globalExports || createMap<Symbol>();
+            file.symbol.globalExports = file.symbol.globalExports || new StringMap<Symbol>();
             declareSymbol(file.symbol.globalExports, file.symbol, node, SymbolFlags.Alias, SymbolFlags.AliasExcludes);
         }
 
@@ -2095,7 +2094,7 @@ namespace ts {
             Debug.assert(isInJavaScriptFile(node));
             // Declare a 'member' if the container is an ES5 class or ES6 constructor
             if (container.kind === SyntaxKind.FunctionDeclaration || container.kind === SyntaxKind.FunctionExpression) {
-                container.symbol.members = container.symbol.members || createMap<Symbol>();
+                container.symbol.members = container.symbol.members || new StringMap<Symbol>();
                 // It's acceptable for multiple 'this' assignments of the same identifier to occur
                 declareSymbol(container.symbol.members, container.symbol, node, SymbolFlags.Property, SymbolFlags.PropertyExcludes & ~SymbolFlags.Property);
             }
@@ -2127,14 +2126,14 @@ namespace ts {
             constructorFunction.parent = classPrototype;
             classPrototype.parent = leftSideOfAssignment;
 
-            const funcSymbol = container.locals[constructorFunction.text];
+            const funcSymbol = container.locals.get(constructorFunction.text);
             if (!funcSymbol || !(funcSymbol.flags & SymbolFlags.Function || isDeclarationOfFunctionExpression(funcSymbol))) {
                 return;
             }
 
             // Set up the members collection if it doesn't exist already
             if (!funcSymbol.members) {
-                funcSymbol.members = createMap<Symbol>();
+                funcSymbol.members = new StringMap<Symbol>();
             }
 
             // Declare the method/property
@@ -2167,7 +2166,7 @@ namespace ts {
                 bindAnonymousDeclaration(node, SymbolFlags.Class, bindingName);
                 // Add name of class expression into the map for semantic classifier
                 if (node.name) {
-                    classifiableNames[node.name.text] = node.name.text;
+                    classifiableNames.add(node.name.text);
                 }
             }
 
@@ -2183,14 +2182,15 @@ namespace ts {
             // module might have an exported variable called 'prototype'.  We can't allow that as
             // that would clash with the built-in 'prototype' for the class.
             const prototypeSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Prototype, "prototype");
-            if (symbol.exports[prototypeSymbol.name]) {
+            const symbolExport = symbol.exports.get(prototypeSymbol.name);
+            if (symbolExport) {
                 if (node.name) {
                     node.name.parent = node;
                 }
-                file.bindDiagnostics.push(createDiagnosticForNode(symbol.exports[prototypeSymbol.name].declarations[0],
+                file.bindDiagnostics.push(createDiagnosticForNode(symbolExport.declarations[0],
                     Diagnostics.Duplicate_identifier_0, prototypeSymbol.name));
             }
-            symbol.exports[prototypeSymbol.name] = prototypeSymbol;
+            symbol.exports.set(prototypeSymbol.name, prototypeSymbol);
             prototypeSymbol.parent = symbol;
         }