v8/src/macros.py

# Copyright 2006-2009 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.

# 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;
const NEW_ONE_BYTE_STRING = true;
const NEW_TWO_BYTE_STRING = false;

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

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

# For date.js.
const HoursPerDay      = 24;
const MinutesPerHour   = 60;
const SecondsPerMinute = 60;
const msPerSecond      = 1000;
const msPerMinute      = 60000;
const msPerHour        = 3600000;
const msPerDay         = 86400000;
const msPerMonth       = 2592000000;

# 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;

# Limits for parts of the date, so that we support all the dates that
# ECMA 262 - 15.9.1.1 requires us to, but at the same time be sure that
# the date (days since 1970) is in SMI range.
const kMinYear  = -1000000;
const kMaxYear  = 1000000;
const kMinMonth = -10000000;
const kMaxMonth = 10000000;

# Safe maximum number of arguments to push to stack, when multiplied by
# pointer size. Used by Function.prototype.apply(), Reflect.apply() and
# Reflect.construct().
const kSafeArgumentsLength = 0x800000;

# Strict mode flags for passing to %SetProperty
const kSloppyMode = 0;
const kStrictMode = 1;

# Native cache ids.
const STRING_TO_REGEXP_CACHE_ID = 0;

# Type query macros.
#
# Note: We have special support for typeof(foo) === 'bar' in the compiler.
#       It will *not* generate a runtime typeof call for the most important
#       values of 'bar'.
macro IS_NULL(arg)              = (arg === null);
macro IS_NULL_OR_UNDEFINED(arg) = (arg == null);
macro IS_UNDEFINED(arg)         = (arg === (void 0));
macro IS_NUMBER(arg)            = (typeof(arg) === 'number');
macro IS_STRING(arg)            = (typeof(arg) === 'string');
macro IS_BOOLEAN(arg)           = (typeof(arg) === 'boolean');
macro IS_SYMBOL(arg)            = (typeof(arg) === 'symbol');
macro IS_OBJECT(arg)            = (%_IsObject(arg));
macro IS_ARRAY(arg)             = (%_IsArray(arg));
macro IS_FUNCTION(arg)          = (%_IsFunction(arg));
macro IS_REGEXP(arg)            = (%_IsRegExp(arg));
macro IS_SET(arg)               = (%_ClassOf(arg) === 'Set');
macro IS_MAP(arg)               = (%_ClassOf(arg) === 'Map');
macro IS_WEAKMAP(arg)           = (%_ClassOf(arg) === 'WeakMap');
macro IS_WEAKSET(arg)           = (%_ClassOf(arg) === 'WeakSet');
macro IS_DATE(arg)              = (%_ClassOf(arg) === 'Date');
macro IS_NUMBER_WRAPPER(arg)    = (%_ClassOf(arg) === 'Number');
macro IS_STRING_WRAPPER(arg)    = (%_ClassOf(arg) === 'String');
macro IS_SYMBOL_WRAPPER(arg)    = (%_ClassOf(arg) === 'Symbol');
macro IS_BOOLEAN_WRAPPER(arg)   = (%_ClassOf(arg) === 'Boolean');
macro IS_ERROR(arg)             = (%_ClassOf(arg) === 'Error');
macro IS_SCRIPT(arg)            = (%_ClassOf(arg) === 'Script');
macro IS_ARGUMENTS(arg)         = (%_ClassOf(arg) === 'Arguments');
macro IS_GLOBAL(arg)            = (%_ClassOf(arg) === 'global');
macro IS_ARRAYBUFFER(arg)       = (%_ClassOf(arg) === 'ArrayBuffer');
macro IS_DATAVIEW(arg)          = (%_ClassOf(arg) === 'DataView');
macro IS_GENERATOR(arg)         = (%_ClassOf(arg) === 'Generator');
macro IS_SET_ITERATOR(arg)      = (%_ClassOf(arg) === 'Set Iterator');
macro IS_MAP_ITERATOR(arg)      = (%_ClassOf(arg) === 'Map Iterator');
macro IS_UNDETECTABLE(arg)      = (%_IsUndetectableObject(arg));

# Macro for ECMAScript 5 queries of the type:
# "Type(O) is object."
# This is the same as being either a function or an object in V8 terminology
# (including proxies).
# In addition, an undetectable object is also included by this.
macro IS_SPEC_OBJECT(arg)   = (%_IsSpecObject(arg));

# Macro for ECMAScript 5 queries of the type:
# "IsCallable(O)"
# We assume here that this is the same as being either a function or a function
# proxy. That ignores host objects with [[Call]] methods, but in most situations
# we cannot handle those anyway.
macro IS_SPEC_FUNCTION(arg) = (%_ClassOf(arg) === 'Function');

# Macro for ES6 CheckObjectCoercible
# Will throw a TypeError of the form "[functionName] called on null or undefined".
macro CHECK_OBJECT_COERCIBLE(arg, functionName) = if (IS_NULL_OR_UNDEFINED(arg) && !IS_UNDETECTABLE(arg)) throw MakeTypeError('called_on_null_or_undefined', [functionName]);

# Indices in bound function info retrieved by %BoundFunctionGetBindings(...).
const kBoundFunctionIndex = 0;
const kBoundThisIndex = 1;
const kBoundArgumentsStartIndex = 2;

# 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 NUMBER_IS_FINITE(arg) = (%_IsSmi(%IS_VAR(arg)) || ((arg == arg) && (arg != 1/0) && (arg != -1/0)));
macro TO_INTEGER(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToInteger(ToNumber(arg)));
macro TO_INTEGER_FOR_SIDE_EFFECT(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : ToNumber(arg));
macro TO_INTEGER_MAP_MINUS_ZERO(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToIntegerMapMinusZero(ToNumber(arg)));
macro TO_INT32(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : (arg >> 0));
macro TO_UINT32(arg) = (arg >>> 0);
macro TO_STRING_INLINE(arg) = (IS_STRING(%IS_VAR(arg)) ? arg : NonStringToString(arg));
macro TO_NUMBER_INLINE(arg) = (IS_NUMBER(%IS_VAR(arg)) ? arg : NonNumberToNumber(arg));
macro TO_OBJECT_INLINE(arg) = (IS_SPEC_OBJECT(%IS_VAR(arg)) ? arg : ToObject(arg));
macro JSON_NUMBER_TO_STRING(arg) = ((%_IsSmi(%IS_VAR(arg)) || arg - arg == 0) ? %_NumberToString(arg) : "null");
macro HAS_OWN_PROPERTY(obj, index) = (%_CallFunction(obj, index, ObjectHasOwnProperty));
macro SHOULD_CREATE_WRAPPER(functionName, receiver) = (!IS_SPEC_OBJECT(receiver) && %IsSloppyModeFunction(functionName));
macro HAS_INDEX(array, index, is_array) = ((is_array && %_HasFastPackedElements(%IS_VAR(array))) ? (index < array.length) : (index in array));

# Private names.
# GET_PRIVATE should only be used if the property is known to exists on obj
# itself (it should really use %GetOwnProperty, but that would be way slower).
macro GLOBAL_PRIVATE(name) = (%CreateGlobalPrivateOwnSymbol(name));
macro NEW_PRIVATE_OWN(name) = (%CreatePrivateOwnSymbol(name));
macro IS_PRIVATE(sym) = (%SymbolIsPrivate(sym));
macro HAS_PRIVATE(obj, sym) = (%HasOwnProperty(obj, sym));
macro HAS_DEFINED_PRIVATE(obj, sym) = (!IS_UNDEFINED(obj[sym]));
macro GET_PRIVATE(obj, sym) = (obj[sym]);
macro SET_PRIVATE(obj, sym, val) = (obj[sym] = val);
macro DELETE_PRIVATE(obj, sym) = (delete obj[sym]);

# Constants.  The compiler constant folds them.
const NAN = $NaN;
const INFINITY = (1/0);
const UNDEFINED = (void 0);

# Macros implemented in Python.
python macro CHAR_CODE(str) = ord(str[1]);

# Constants used on an array to implement the properties of the RegExp object.
const REGEXP_NUMBER_OF_CAPTURES = 0;
const REGEXP_FIRST_CAPTURE = 3;

# We can't put macros in macros so we use constants here.
# REGEXP_NUMBER_OF_CAPTURES
macro NUMBER_OF_CAPTURES(array) = ((array)[0]);

# Limit according to ECMA 262 15.9.1.1
const MAX_TIME_MS = 8640000000000000;
# Limit which is MAX_TIME_MS + msPerMonth.
const MAX_TIME_BEFORE_UTC = 8640002592000000;

# Gets the value of a Date object. If arg is not a Date object
# a type error is thrown.
macro CHECK_DATE(arg) = if (%_ClassOf(arg) !== 'Date') ThrowDateTypeError();
macro LOCAL_DATE_VALUE(arg) = (%_DateField(arg, 0) + %_DateField(arg, 21));
macro UTC_DATE_VALUE(arg)    = (%_DateField(arg, 0));

macro LOCAL_YEAR(arg)        = (%_DateField(arg, 1));
macro LOCAL_MONTH(arg)       = (%_DateField(arg, 2));
macro LOCAL_DAY(arg)         = (%_DateField(arg, 3));
macro LOCAL_WEEKDAY(arg)     = (%_DateField(arg, 4));
macro LOCAL_HOUR(arg)        = (%_DateField(arg, 5));
macro LOCAL_MIN(arg)         = (%_DateField(arg, 6));
macro LOCAL_SEC(arg)         = (%_DateField(arg, 7));
macro LOCAL_MS(arg)          = (%_DateField(arg, 8));
macro LOCAL_DAYS(arg)        = (%_DateField(arg, 9));
macro LOCAL_TIME_IN_DAY(arg) = (%_DateField(arg, 10));

macro UTC_YEAR(arg)        = (%_DateField(arg, 11));
macro UTC_MONTH(arg)       = (%_DateField(arg, 12));
macro UTC_DAY(arg)         = (%_DateField(arg, 13));
macro UTC_WEEKDAY(arg)     = (%_DateField(arg, 14));
macro UTC_HOUR(arg)        = (%_DateField(arg, 15));
macro UTC_MIN(arg)         = (%_DateField(arg, 16));
macro UTC_SEC(arg)         = (%_DateField(arg, 17));
macro UTC_MS(arg)          = (%_DateField(arg, 18));
macro UTC_DAYS(arg)        = (%_DateField(arg, 19));
macro UTC_TIME_IN_DAY(arg) = (%_DateField(arg, 20));

macro TIMEZONE_OFFSET(arg)   = (%_DateField(arg, 21));

macro SET_UTC_DATE_VALUE(arg, value) = (%DateSetValue(arg, value, 1));
macro SET_LOCAL_DATE_VALUE(arg, value) = (%DateSetValue(arg, value, 0));

# Last input and last subject of regexp matches.
const LAST_SUBJECT_INDEX = 1;
macro LAST_SUBJECT(array) = ((array)[1]);
macro LAST_INPUT(array) = ((array)[2]);

# REGEXP_FIRST_CAPTURE
macro CAPTURE(index) = (3 + (index));
const CAPTURE0 = 3;
const CAPTURE1 = 4;

# For the regexp capture override array.  This has the same
# format as the arguments to a function called from
# String.prototype.replace.
macro OVERRIDE_MATCH(override) = ((override)[0]);
macro OVERRIDE_POS(override) = ((override)[(override).length - 2]);
macro OVERRIDE_SUBJECT(override) = ((override)[(override).length - 1]);
# 1-based so index of 1 returns the first capture
macro OVERRIDE_CAPTURE(override, index) = ((override)[(index)]);

# PropertyDescriptor return value indices - must match
# PropertyDescriptorIndices in runtime-object.cc.
const IS_ACCESSOR_INDEX = 0;
const VALUE_INDEX = 1;
const GETTER_INDEX = 2;
const SETTER_INDEX = 3;
const WRITABLE_INDEX = 4;
const ENUMERABLE_INDEX = 5;
const CONFIGURABLE_INDEX = 6;

# For messages.js
# Matches Script::Type from objects.h
const TYPE_NATIVE = 0;
const TYPE_EXTENSION = 1;
const TYPE_NORMAL = 2;

# Matches Script::CompilationType from objects.h
const COMPILATION_TYPE_HOST = 0;
const COMPILATION_TYPE_EVAL = 1;
const COMPILATION_TYPE_JSON = 2;

# Matches Messages::kNoLineNumberInfo from v8.h
const kNoLineNumberInfo = 0;

# Matches PropertyAttributes from property-details.h
const PROPERTY_ATTRIBUTES_NONE = 0;
const PROPERTY_ATTRIBUTES_STRING = 8;
const PROPERTY_ATTRIBUTES_SYMBOLIC = 16;
const PROPERTY_ATTRIBUTES_PRIVATE_SYMBOL = 32;

# Use for keys, values and entries iterators.
const ITERATOR_KIND_KEYS = 1;
const ITERATOR_KIND_VALUES = 2;
const ITERATOR_KIND_ENTRIES = 3;

# Check whether debug is active.
const DEBUG_IS_ACTIVE = (%_DebugIsActive() != 0);
macro DEBUG_IS_STEPPING(function) = (%_DebugIsActive() != 0 && %DebugCallbackSupportsStepping(function));
macro DEBUG_PREPARE_STEP_IN_IF_STEPPING(function) = if (DEBUG_IS_STEPPING(function)) %DebugPrepareStepInIfStepping(function);