regisp
diff --git a/‎src/compiler/core.ts
Lines changed: 25 additions & 22 deletions b/‎src/compiler/core.ts
Lines changed: 25 additions & 22 deletions
diff --git a/‎src/compiler/tsc.ts
Lines changed: 0 additions & 2 deletions b/‎src/compiler/tsc.ts
Lines changed: 0 additions & 2 deletions
@@ -1151,17 +1151,16 @@ namespace ts {
     /** Performance measurements for the compiler. */
     /*@internal*/
     export namespace performance {
-        let counters: Map<number> = {};
-        let measures: Map<number> = {};
-        let enabled = false;
+        let counters: Map<number>;
+        let measures: Map<number>;
 
         /**
          * Increments a counter with the specified name.
          *
          * @param counterName The name of the counter.
          */
         export function increment(counterName: string) {
-            if (enabled) {
+            if (counters) {
                 counters[counterName] = (getProperty(counters, counterName) || 0) + 1;
             }
         }
@@ -1172,14 +1171,14 @@ namespace ts {
          * @param counterName The name of the counter.
          */
         export function getCount(counterName: string) {
-            return enabled && getProperty(counters, counterName) || 0;
+            return counters && getProperty(counters, counterName) || 0;
         }
 
         /**
          * Marks the start of a performance measurement.
          */
         export function mark() {
-            return enabled ? Date.now() : 0;
+            return measures ? Date.now() : 0;
         }
 
         /**
@@ -1189,7 +1188,7 @@ namespace ts {
          * @param marker The timestamp of the starting mark.
          */
         export function measure(measureName: string, marker: number) {
-            if (enabled) {
+            if (measures) {
                 measures[measureName] = (getProperty(measures, measureName) || 0) + (mark() - marker);
             }
         }
@@ -1200,25 +1199,29 @@ namespace ts {
          * @param measureName The name of the measure whose durations should be accumulated.
          */
         export function getDuration(measureName: string) {
-            return enabled && getProperty(measures, measureName) || 0;
+            return measures && getProperty(measures, measureName) || 0;
         }
 
-        /**
-         * Resets all marks and measurements in the performance service.
-         */
-        export function reset() {
-            counters = {};
-            measures = {};
-        }
-
-        /** Enables performance measurements for the compiler. */
+        /** Enables (and resets) performance measurements for the compiler. */
         export function enable() {
-            enabled = true;
-        }
-
-        /** Disables performance measurements for the compiler. */
+            counters = { };
+            measures = {
+                programTime: 0,
+                parseTime: 0,
+                bindTime: 0,
+                emitTime: 0,
+                ioReadTime: 0,
+                ioWriteTime: 0,
+                printTime: 0,
+                commentTime: 0,
+                sourceMapTime: 0
+            };
+        }
+
+        /** Disables (and clears) performance measurements for the compiler. */
         export function disable() {
-            enabled = false;
+            counters = undefined;
+            measures = undefined;
         }
     }
 }
@@ -546,7 +546,6 @@ namespace ts {
     function compile(fileNames: string[], compilerOptions: CompilerOptions, compilerHost: CompilerHost) {
         if (compilerOptions.diagnostics || compilerOptions.extendedDiagnostics) {
             performance.enable();
-            performance.reset();
         }
 
         const program = createProgram(fileNames, compilerOptions, compilerHost);
@@ -594,7 +593,6 @@ namespace ts {
             reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);
 
             performance.disable();
-            performance.reset();
         }
 
         return { program, exitStatus };
Original file line number	Diff line number	Diff line change
`@@ -546,7 +546,6 @@ namespace ts {`
`546`	`546`	`function compile(fileNames: string[], compilerOptions: CompilerOptions, compilerHost: CompilerHost) {`
`547`	`547`	`if (compilerOptions.diagnostics \|\| compilerOptions.extendedDiagnostics) {`
`548`	`548`	`performance.enable();`
`549`		`- performance.reset();`
`550`	`549`	`}`
`551`	`550`
`552`	`551`	`const program = createProgram(fileNames, compilerOptions, compilerHost);`
`@@ -594,7 +593,6 @@ namespace ts {`
`594`	`593`	`reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);`
`595`	`594`
`596`	`595`	`performance.disable();`
`597`		`- performance.reset();`
`598`	`596`	`}`
`599`	`597`
`600`	`598`	`return { program, exitStatus };`