Minor cleanups to macros.py.

Review URL: http://codereview.chromium.org/6232

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@415 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/macros.py

@@ -52,7 +52,7 @@ const STRING_HINT = 2;
 const kFunctionTag  = 0;
 const kNewObjectTag = 1;
 
-# For date.js
+# For date.js.
 const HoursPerDay      = 24;
 const MinutesPerHour   = 60;
 const SecondsPerMinute = 60;
@@ -61,7 +61,7 @@ const msPerMinute =             60000;
 const msPerHour        = 3600000;
 const msPerDay         = 86400000;
 
-# Note: kDayZeroInJulianDay = ToJulianDay(1970, 0, 1)
+# Note: kDayZeroInJulianDay = ToJulianDay(1970, 0, 1).
 const kInvalidDate        = 'Invalid Date';
 const kDayZeroInJulianDay = 2440588;
 const kMonthMask          = 0x1e0;
@@ -69,7 +69,7 @@ const kDayMask   = 0x01f;
 const kYearShift          = 9;
 const kMonthShift         = 5;
 
-# Type query macros
+# Type query macros.
 macro IS_NULL(arg)              = (arg === null);
 macro IS_NULL_OR_UNDEFINED(arg) = (arg == null);
 macro IS_UNDEFINED(arg)         = (typeof(arg) === 'undefined');
@@ -84,12 +84,12 @@ macro IS_DATE(arg)              = (%ClassOf(arg) === 'Date');
 macro IS_ERROR(arg)             = (%ClassOf(arg) === 'Error');
 macro IS_SCRIPT(arg)            = (%ClassOf(arg) === 'Script');
 
-# 'Inline' macros
-# (Make sure arg is evaluated only once via %IS_VAR)
+# Inline macros. Use %IS_VAR to make sure arg is evaluated only once.
 macro NUMBER_IS_NAN(arg) = (!%_IsSmi(%IS_VAR(arg)) && !(arg == arg));
 macro TO_INTEGER(arg)    = (%_IsSmi(%IS_VAR(arg)) ? arg : ToInteger(arg));
 macro TO_INT32(arg)      = (%_IsSmi(%IS_VAR(arg)) ? arg : ToInt32(arg));
 
+# Macros implemented in Python.
 python macro CHAR_CODE(str) = ord(str[1]);
 
 # Accessors for original global properties that ensure they have been loaded.