Fix assert in the Date prototype

JerryScript-DCO-1.0-Signed-off-by: Kristof Kosztyo kkosztyo.u-szeged@partner.samsung.com

Author: kkristof

jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.cpp

@@ -726,6 +726,7 @@ ecma_date_make_day (ecma_number_t year, /**< year value */
                     ecma_number_t month, /**< month value */
                     ecma_number_t date) /**< date value */
 {
+  /* 1. */
   if (ecma_number_is_nan (year)
       || ecma_number_is_nan (month)
       || ecma_number_is_nan (date)
@@ -736,25 +737,66 @@ ecma_date_make_day (ecma_number_t year, /**< year value */
     return ecma_number_make_nan ();
   }
 
+  /* 2., 3., 4. */
   ecma_number_t y = ecma_number_trunc (year);
   ecma_number_t m = ecma_number_trunc (month);
   ecma_number_t dt = ecma_number_trunc (date);
+  /* 5. */
   ecma_number_t ym = y + (ecma_number_t) floor (m / 12);
+  /* 6. */
   ecma_number_t mn = (ecma_number_t) fmod (m, 12);
   mn = (mn < 0) ? 12 + mn : mn;
+
+  /* 7. */
   ecma_number_t time = ecma_date_time_from_year (ym);
+  int32_t step = 182;
+  int32_t delta = step;
+
+  /**
+   * The algorithm below searches the following date: ym-mn-1
+   * To find this time it starts from the beggining of the year (ym)
+   * then increase it by ECMA_DATE_MS_PER_DAY until it reaches the
+   * right date.
+   */
+  if (ecma_date_year_from_time (time) == ym)
+  {
+    /**
+     * Binary search to get the closest day in the previous month.
+     * It has to use integer days so sometimes the found time
+     * needs some more increasing which is done day by day below.
+     */
+    while (delta)
+    {
+      if (ecma_date_month_from_time (time + step * ECMA_DATE_MS_PER_DAY) < mn)
+      {
+        step += delta;
+      }
+      else
+      {
+        step -= delta;
+      }
+      delta = delta / 2;
+    }
+
+    if (ecma_date_month_from_time (time + step) < mn)
+    {
+      time += step * ECMA_DATE_MS_PER_DAY;
+    }
 
-  JERRY_ASSERT (ecma_date_year_from_time (time) == ym);
+    /* Get the month's first day */
+    while (ecma_date_month_from_time (time) < mn)
+    {
+      time += ECMA_DATE_MS_PER_DAY;
+    }
 
-  while (ecma_date_month_from_time (time) < mn)
-  {
-    time += ECMA_DATE_MS_PER_DAY;
+    if (ecma_date_month_from_time (time) == mn && ecma_date_date_from_time (time) == 1)
+    {
+      /* 8. */
+      return ecma_date_day (time) + dt - ((ecma_number_t) 1.0);
+    }
   }
 
-  JERRY_ASSERT (ecma_date_month_from_time (time) == mn);
-  JERRY_ASSERT (ecma_date_date_from_time (time) == 1);
-
-  return ecma_date_day (time) + dt - ((ecma_number_t) 1.0);
+  return ecma_number_make_nan ();
 } /* ecma_date_make_day */
 
 /**

jerry-core/ecma/builtin-objects/ecma-builtin-helpers.h

@@ -56,13 +56,13 @@ extern ecma_completion_value_t ecma_builtin_helper_def_prop (ecma_object_t *obj_
  *          ECMA-262 v5, 15.9.1.1, 15.9.1.10
  */
 /* Hours in a day. */
-#define ECMA_DATE_HOURS_PER_DAY         24
+#define ECMA_DATE_HOURS_PER_DAY         ((ecma_number_t) 24)
 /* Minutes in an hour. */
-#define ECMA_DATE_MINUTES_PER_HOUR      60
+#define ECMA_DATE_MINUTES_PER_HOUR      ((ecma_number_t) 60)
 /* Seconds in a minute. */
-#define ECMA_DATE_SECONDS_PER_MINUTE    60
+#define ECMA_DATE_SECONDS_PER_MINUTE    ((ecma_number_t) 60)
 /* Milliseconds in a second. */
-#define ECMA_DATE_MS_PER_SECOND         1000
+#define ECMA_DATE_MS_PER_SECOND         ((ecma_number_t) 1000)
 /* ECMA_DATE_MS_PER_MINUTE == 60000 */
 #define ECMA_DATE_MS_PER_MINUTE         (ECMA_DATE_MS_PER_SECOND * ECMA_DATE_SECONDS_PER_MINUTE)
 /* ECMA_DATE_MS_PER_HOUR == 3600000 */

tests/jerry/date-construct.js

@@ -52,6 +52,12 @@ assert (d.valueOf() == 8.64e+15);
 d = new Date(8.64e+15 + 1);
 assert (isNaN(d.valueOf()));
 
+d = new Date(20000000, 0, 1);
+assert (isNaN(d.valueOf()));
+
+d = new Date(0, 20000000, 1);
+assert (isNaN(d.valueOf()));
+
 var Obj = function (val)
 {
   this.value = val;