src/macros.py

# Copyright 2006-2008 the V8 project authors. All rights reserved.
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# Dictionary that is passed as defines for js2c.py.
# Used for defines that must be defined for all native js files.

const NONE        = 0;
const READ_ONLY   = 1;
const DONT_ENUM   = 2;
const DONT_DELETE = 4;

# Constants used for getter and setter operations.
const GETTER = 0;
const SETTER = 1;

# These definitions must match the index of the properties in objects.h.
const kApiTagOffset               = 0;
const kApiPropertyListOffset      = 1;
const kApiSerialNumberOffset      = 2;
const kApiConstructorOffset       = 2;
const kApiPrototypeTemplateOffset = 5;
const kApiParentTemplateOffset    = 6;

const NO_HINT     = 0;
const NUMBER_HINT = 1;
const STRING_HINT = 2;

const kFunctionTag  = 0;
const kNewObjectTag = 1;

# For date.js.
const HoursPerDay      = 24;
const MinutesPerHour   = 60;
const SecondsPerMinute = 60;
const msPerSecond      = 1000;
const msPerMinute      = 60000;
const msPerHour        = 3600000;
const msPerDay         = 86400000;

# Note: kDayZeroInJulianDay = ToJulianDay(1970, 0, 1).
const kInvalidDate        = 'Invalid Date';
const kDayZeroInJulianDay = 2440588;
const kMonthMask          = 0x1e0;
const kDayMask            = 0x01f;
const kYearShift          = 9;
const kMonthShift         = 5;

# Type query macros.
macro IS_NULL(arg)              = (arg === null);
macro IS_NULL_OR_UNDEFINED(arg) = (arg == null);
macro IS_UNDEFINED(arg)         = (typeof(arg) === 'undefined');
macro IS_FUNCTION(arg)          = (typeof(arg) === 'function');
macro IS_NUMBER(arg)            = (typeof(arg) === 'number');
macro IS_STRING(arg)            = (typeof(arg) === 'string');
macro IS_OBJECT(arg)            = (typeof(arg) === 'object');
macro IS_BOOLEAN(arg)           = (typeof(arg) === 'boolean');
macro IS_REGEXP(arg)            = %HasRegExpClass(arg);
macro IS_ARRAY(arg)             = %HasArrayClass(arg);
macro IS_DATE(arg)              = %HasDateClass(arg);
macro IS_ERROR(arg)             = (%ClassOf(arg) === 'Error');
macro IS_SCRIPT(arg)            = (%ClassOf(arg) === 'Script');
macro FLOOR(arg)                = %Math_floor(arg);

# 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.
const ORIGINAL_REGEXP = (global.RegExp, $RegExp);
const ORIGINAL_DATE   = (global.Date, $Date);