profiling option from C++

1 files changed, 30 insertions, 0 deletions

diff --git a/src/library.js b/src/library.js
index faa86c68..4d230bcc 100644
--- a/src/library.js
+++ b/src/library.js
@@ -5417,6 +5417,36 @@ LibraryManager.library = {
   EMSCRIPTEN_COMMENT__inline: function(param) {
     param = stripCorrections(param);
     return '// ' + Variables.globals[param].value.text.replace('\\00', '') + '   ';
+  },
+
+  $Profiling: {
+    max_: 0,
+    times: null,
+    invalid: 0,
+    dump: function() {
+      if (Profiling.invalid) {
+        print('Invalid # of calls to Profiling begin and end!');
+        return;
+      }
+      print('Profiling data:')
+      for (var i = 0; i < Profiling.max_; i++) {
+        print('Block ' + i + ': ' + Profiling.times[i]);
+      }
+    }
+  },
+  EMSCRIPTEN_PROFILE_INIT__deps: ['$Profiling'],
+  EMSCRIPTEN_PROFILE_INIT: function(max_) {
+    Profiling.max_ = max_;
+    Profiling.times = new Array(max_);
+    for (var i = 0; i < max_; i++) Profiling.times[i] = 0;
+  },
+  EMSCRIPTEN_PROFILE_BEGIN__inline: function(id) {
+    return 'Profiling.times[' + id + '] -= Date.now();'
+         + 'Profiling.invalid++;'
+  },
+  EMSCRIPTEN_PROFILE_END__inline: function(id) {
+    return 'Profiling.times[' + id + '] += Date.now();'
+         + 'Profiling.invalid--;'
   }
 };