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Status and Roadmap

Max Graey edited this page Nov 9, 2021 · 156 revisions

Current state of development is tracked in GitHub projects.

High level status

  • Most of TypeScript's AOT-compatible syntax is supported
  • A managed runtime takes care of memory management and GC
  • Classes are more like C-structs with methods (no virtual overloads yet)
  • Standard library is functional but still needs more work
  • Throwing an exception terminates the entire program (needs WebAssembly/exception-handling)
  • We need more tests (pretty sure this will remain here)

High level goals

  • Get a memory manager and GC combo up and running
    • Memory manager (TLSF)
    • Automatic reference counting & garbage collection (PureRC)
  • Get a working standard library up (where AOT-compatible)
  • Improve linking, e.g. with C, based on what's supported by common tools
  • Compile the AssemblyScript compiler to WebAssembly using itself
  • Provide tools to automatically generate glue code and definitions

And, of course, keep up with the state of WebAssembly, most notably at this point:

Proposal Phase Status
Sign Extension Operations standardized --enable sign-extension
Mutable Globals standardized --enable mutable-global
Non-trapping float-to-int Conversions standardized --enable nontrapping-f2i
Bulk Memory Operations standardized --enable bulk-memory
Reference Types standardized --enable reference-types
Multi-Value standardized
SIMD implementation --enable simd
Threads implementation --enable threads
Tail Call implementation
Exception Handling implementation
Function References proposal
Interface Types proposal
Memory64 proposal
Wasm GC proposal

Standard library compatibility

AssemblyScript comes with its own lightweight standard library that aims to be as compatible as it can get to what you'd expect in the browser. The following table outlines what's implemented already:

Feature Notes

Globals

NaN Context-sensitive (f32 in f32 context, otherwise f64)
Infinity Context-sensitive (f32 in f32 context, otherwise f64)
isFinite
isNaN
parseFloat
parseInt
decodeURI
decodeURIComponent
encodeURI
encodeURIComponent

Number

There is no Number object in AssemblyScript, but one for each type instead.
EPSILON
MIN_VALUE
MAX_VALUE
MIN_NORMAL_VALUE AssemblyScript specific
MIN_SAFE_INTEGER
MAX_SAFE_INTEGER
NaN
NEGATIVE_INFINITY
POSITIVE_INFINITY
isFinite
isInteger
isNaN
isSafeInteger
parseFloat
parseInt
toExponential
toFixed
toLocaleString
toPrecision
toString

Array

length
at Stage 3 Proposal
from
isArray
of
concat
copyWithin
entries
every No closures yet
fill
filter No closures yet
find
findLast Stage 3 Proposal
findIndex No closures yet
findLastIndex Stage 3 Proposal
flat Partially
flatMap
forEach No closures yet
includes
indexOf
join
keys
lastIndexOf
map No closures yet
pop
push
reduce No closures yet
reduceRight No closures yet
reverse
shift
slice
some No closures yet
sort
splice Partially implement without inserting items
toLocaleString
toString
unshift
values
[Symbol.iterator]

TypedArray

BYTES_PER_ELEMENT
at Stage 3 Proposal
buffer
byteLength
byteOffset
length
from
of
copyWithin
entries
every No closures yet
fill
filter No closures yet
find
findLast Stage 3 Proposal
findIndex No closures yet
findLastIndex Stage 3 Proposal
forEach No closures yet
includes
indexOf
join
keys
lastIndexOf
map No closures yet
reduce No closures yet
reduceRight No closures yet
reverse
set
slice
some No closures yet
sort
subarray
toLocaleString
toString
values
[Symbol.iterator]

ArrayBuffer

byteLength
isView
slice
toString

DataView

buffer
byteLength
byteOffset
getInt8
getUint8
getInt16
getUint16
getInt32
getUint32
getInt64 AssemblyScript specific
getUint64 AssemblyScript specific
getBigInt64 Required BigInt
getBigUint64 Required BigInt
getFloat32
getFloat64
setInt8
setUint8
setInt16
setUint16
setInt32
setUint32
setInt64 AssemblyScript specific
setUint64 AssemblyScript specific
setBigInt64 Required BigInt
setBigUint64 Required BigInt
setFloat32
setFloat64
toString

String

length
fromCharCode
fromCharCodes AssemblyScript specific
fromCodePoint
fromCodePoints AssemblyScript specific
UTF8 AssemblyScript specific (See docs)
UTF16 AssemblyScript specific (See docs)
at Stage 3 Proposal
charAt
charCodeAt
concat
endsWith
includes
indexOf
lastIndexOf
localeCompare Very basic. Without locales and options
match
matchAll
normalize
padEnd
padStart
repeat
replace Without Regexp and callback yet
replaceAll
search
slice
split Without Regexp
startsWith
substr
substring
toLocaleLowerCase
toLocaleUpperCase
toLowerCase
toUpperCase
toString
trim
trimLeft/trimStart
trimRight/trimEnd
[Symbol.iterator]
raw

Symbol

hasInstance
isConcatSpreadable
isRegExp
match
replace
search
species
split
toPrimitive
toStringTag
unscopables
for
keyFor
toString

Math

This also applies to specific Mathf (single float point) version of Math
E
LN10
LN2
LOG10E
LOG2E
PI
SQRT1_2
SQRT2
sincos_sin AssemblyScript specific
sincos_cos AssemblyScript specific
abs
acos
acosh
asin
asinh
atan
atan2
atanh
cbrt
ceil
clz32 Just for compatibility. Not recommended.
cos
cosh
exp
exp2 AssemblyScript specific
expm1
floor
fround
hypot
imul Just for compatibility. Not recommended.
log
log10
log1p
log2
max
min
pow
random
seedRandom AssemblyScript specific
round
sign
signbit Stage 1 Proposal
sin
sincos AssemblyScript specific
sinh
sqrt
tan
tanh
trunc

Map

size
clear
delete
entries
forEach
get
has
set
upsert Stage 3 proposal
keys Return array instead iterator currently
values Return array instead iterator currently
toString
[Symbol.iterator]

Set

size
add
clear
delete
difference Stage 2 Proposal
entries
forEach
has
intersection Stage 2 Proposal
isDisjointFrom Stage 2 Proposal
isSubsetOf Stage 2 Proposal
isSupersetOf Stage 2 Proposal
union Stage 2 Proposal
symmetricDifference Stage 2 Proposal
values Return array instead iterator currently
toString
[Symbol.iterator]

WeakMap

delete
get
has
set
toString

WeakSet

add
delete
has
toString

Console

assert
clear
count
countReset
dir
error
group
groupCollapsed
groupEnd
info
log
table
time
timeEnd
trace
warn

JSON

parse
stringify

Object

is
keys
assign
create
entries
getOwnPropertyNames
getOwnPropertySymbols
toString
values

Date

UTC
now
parse Only for ISO format
getDate
getDay
getFullYear
getHours
getMilliseconds
getMinutes
getMonth
getSeconds
getTime
getTimezoneOffset
getUTCDate
getUTCDay
getUTCFullYear
getUTCHours
getUTCMilliseconds
getUTCMinutes
getUTCMonth
getUTCSeconds
setDate
setFullYear
setHours
setMilliseconds
setMinutes
setMonth
setSeconds
setTime
setUTCDate
setUTCFullYear
setUTCHours
setUTCMilliseconds
setUTCMinutes
setUTCMonth
setUTCSeconds
toDateString
toISOString
toJSON
toLocaleDateString
toLocaleString
toLocaleTimeString
toString Without timezone and local offset
toTimeString Without timezone and local offset
toUTCString

Error

message
name
stack
toString

Iterator / AsyncIterator

asIndexedPairs Iterator helpers proposal (Stage 2)
drop Iterator helpers proposal (Stage 2)
every Iterator helpers proposal (Stage 2)
from Iterator helpers proposal (Stage 2)
filter Iterator helpers proposal (Stage 2)
find Iterator helpers proposal (Stage 2)
flatMap Iterator helpers proposal (Stage 2)
forEach Iterator helpers proposal (Stage 2)
map Iterator helpers proposal (Stage 2)
next
reduce Iterator helpers proposal (Stage 2)
return
take Iterator helpers proposal (Stage 2)
throw
toArray Iterator helpers proposal (Stage 2)
some Iterator helpers proposal (Stage 2)

Promise

all
allSettled
any Stage 2
race
reject
resolve
catch
finally
then

RegExp

lastIndex
dotAll
flags
global
ignoreCase
multiline
source
sticky
unicode
exec
test
toString
[Symbol.replace]
[Symbol.search]
[Symbol.split]

Atomics

add
and
compareExchange
exchange
fence
isLockFree
load
notify
or
store
sub
wait
wake
xor

SIMD (v128)

const
splat
extract_lane(_u/_s)
replace_lane
shuffle
swizzle
add
sub
mul
neg
add_sat_(u/s)
sub_sat_(u/s)
shl
shr_(u/s)
and
or
xor
not
andnot
bitselect
any_true
all_true
bitmask Only i8x16/i16x8/i32x4
eq
ne
lt(_u/_s)
le(_u/_s)
gt(_u/_s)
ge(_u/_s)
load
load_lane
load_splat
load_zero
load8x8_(u/s)
load16x4_(u/s)
load32x2_(u/s)
store
store_lane
abs
min_(s/u) except i64x2
max_(s/u) except i64x2
min Only f32x4/f64x2
max Only f32x4/f64x2
pmin Only f32x4/f64x2
pmax Only f32x4/f64x2
ceil Only f32x4/f64x2
floor Only f32x4/f64x2
trunc Only f32x4/f64x2
nearest Only f32x4/f64x2
dot Only i16x8
avgr_u Only i8x16/i16x8
div Only f32x4/f64x2
sqrt Only f32x4/f64x2
convert_(u/s)
convert_low
trunc_sat_(s/u)
trunc_sat_(s/u)_zero
narrow_(u/s)
extend_low
extend_high
extadd_pairwise_(u/s) Only i8x16/i16x8
extmul_low_(u/s)
extmul_high_(u/s)
demote_zero Only f64x2
promote_low Only f32x4
q15mulr_sat Only i16x8

BigInt

BigInt(str)
BigInt(num)
i32(bn), u32(bn)
i64(bn), u64(bn)
f64(bn), f32(bn)
asIntN
asUintN
!a
-a
~a
a++
a--
a & b
a | b
a ^ b
a + b
a - b
a * b
a / b
a % b
a ** b
a << b
a >> b
a >>> b
a == b
a != b
a > b
a < b
a >= b
a <= b
toLocaleString
toString