Add window.performance.now() to the d8 shell.

TEST=mjsunit/d8-performance-now
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/32433010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17366 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/d8.cc

@@ -166,6 +166,7 @@ Persistent<Context> Shell::utility_context_;
 Persistent<Context> Shell::evaluation_context_;
 ShellOptions Shell::options;
 const char* Shell::kPrompt = "d8> ";
+const i::TimeTicks Shell::kInitialTicks = i::TimeTicks::HighResolutionNow();
 
 
 const int MB = 1024 * 1024;
@@ -289,6 +290,15 @@ int PerIsolateData::RealmFind(Handle<Context> context) {
 }
 
 
+// window.performance.now() returns a time stamp as double, measured in
+// milliseconds.
+void Shell::WindowPerformanceNow(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  i::TimeDelta delta = i::TimeTicks::HighResolutionNow() - kInitialTicks;
+  args.GetReturnValue().Set(delta.InMillisecondsF());
+}
+
+
 // Realm.current() returns the index of the currently active realm.
 void Shell::RealmCurrent(const v8::FunctionCallbackInfo<v8::Value>& args) {
   Isolate* isolate = args.GetIsolate();
@@ -872,6 +882,13 @@ Handle<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
                               RealmSharedGet, RealmSharedSet);
   global_template->Set(String::New("Realm"), realm_template);
 
+  Handle<ObjectTemplate> window_template = ObjectTemplate::New();
+  Handle<ObjectTemplate> performance_template = ObjectTemplate::New();
+  performance_template->Set(String::New("now"),
+                            FunctionTemplate::New(WindowPerformanceNow));
+  window_template->Set(String::New("performance"), performance_template);
+  global_template->Set(String::New("window"), window_template);
+
 #if !defined(V8_SHARED) && !defined(_WIN32) && !defined(_WIN64)
   Handle<ObjectTemplate> os_templ = ObjectTemplate::New();
   AddOSMethods(os_templ);

src/d8.h

@@ -304,6 +304,8 @@ class Shell : public i::AllStatic {
 #endif  // ENABLE_DEBUGGER_SUPPORT
 #endif  // V8_SHARED
 
+  static void WindowPerformanceNow(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmCurrent(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmOwner(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmGlobal(const v8::FunctionCallbackInfo<v8::Value>& args);
@@ -381,6 +383,7 @@ class Shell : public i::AllStatic {
 
   static const char* kPrompt;
   static ShellOptions options;
+  static const i::TimeTicks kInitialTicks;
 
  private:
   static Persistent<Context> evaluation_context_;

test/mjsunit/d8-performance-now.js

@@ -0,0 +1,60 @@
+// Copyright 2013 the V8 project authors. 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
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// 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.
+
+// Flags: --allow-natives-syntax
+
+// Test the window.performance.now() function of d8.  This test only makes
+// sense with d8.
+
+// Don't run this test in gc stress mode. Time differences may be long
+// due to garbage collections.
+%SetFlags("--gc-interval=-1");
+%SetFlags("--nostress-compaction");
+
+(function run() {
+  var start_test = window.performance.now();
+  // Let the retry run for maximum 100ms to reduce flakiness.
+  for (var start = window.performance.now();
+       start - start_test < 100;
+       start = window.performance.now()) {
+    var end = window.performance.now();
+    assertTrue(start >= start_test);
+    assertTrue(end >= start);
+    while (end - start == 0) {
+      var next = window.performance.now();
+      assertTrue(next >= end);
+      end = next;
+    }
+    if (end - start <= 1) {
+      // Found (sub-)millisecond granularity.
+      return;
+    } else {
+      print("Timer difference too big: " + (end - start) + "ms");
+    }
+  }
+  assertTrue(false);
+})()

test/mjsunit/mjsunit.status

@@ -58,6 +58,10 @@
   # Too slow in debug mode for GC stress mode.
   'regress/regress-crbug-217858': [PASS, ['mode == debug', SKIP]],
 
+  ##############################################################################
+  # No need to waste time for this test.
+  'd8-performance-now': [PASS, NO_VARIANTS],
+
   ##############################################################################
   # These use a built-in that's only present in debug mode. They take
   # too long to run in debug mode on ARM and MIPS.