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(func $getPrototypeOf (param externref) (result externref))) |
(import "constructor" "constructor" |
(func $constructor (param externref) (result externref))) |
(import "constructor" "assign" |
(func $assign (param externref) (param externref))) |
;; Two variants of groupBy: with a WASM or JS function as callback, resp. |
(import "constructor" "groupBy" (func $groupBy_i |
(param externref) (param funcref) (result externref))) |
(import "constructor" "groupBy" (func $groupBy_e |
(param externref) (param externref) (result externref))) |
;; We just use this as an object so import as 'global' |
(import "constructor" "prototype" (global $prototype externref)) |
;; Offsets of specific keys within certain objects. |
;; The exact indices are determined later and written here, for now just |
;; initialize to zero. |
;; 'constructor' in Object prototype |
(global $OFF_CONSTRUCTOR (mut i32) (i32.const 0)) |
;; 'value' in descriptor objects |
(global $OFF_VALUE (mut i32) (i32.const 0)) |
;; 'fromCharcode' in String constructor |
(global $OFF_FROMCHARCODE (mut i32) (i32.const 0)) |
;; 'raw' in String constructor |
(global $OFF_RAW (mut i32) (i32.const 0)) |
;; Obtained strings |
(global $s_length (mut externref) (ref.null extern)) |
(global $s_constructor (mut externref) (ref.null extern)) |
(global $s_fromCharCode (mut externref) (ref.null extern)) |
(global $s_raw (mut externref) (ref.null extern)) |
;; Obtained functions |
(global $String_constructor (mut externref) (ref.null extern)) |
(global $String_constructor_raw (mut externref) (ref.null extern)) |
(global $String_constructor_fromCharCode(mut externref)(ref.null extern)) |
;; The reference index for the callbacks below (input) |
(global $g_n (mut i32) (i32.const 0)) |
;; The extracted (saved) element, used by the callbacks below (output) |
(global $g_nth_element (mut externref) (ref.null extern)) |
(global $g_nth_element_i (mut i32) (i32.const 0)) |
;; Callback to be used with Object.groupBy() to extract an element. |
;; Object.groupBy() invokes callback(elem, idx) for every element in the |
;; array. |
(func $save_nth_element (param $val externref) (param $n i32) |
(local.get $n) |
(global.get $g_n) |
i32.eq |
(if |
(then |
(local.get $val) |
(global.set $g_nth_element) |
) |
) |
) |
;; Same as above but saves an i32 instead of externref |
(func $save_nth_element_i (param $val i32) (param $n i32) |
(local.get $n) |
(global.get $g_n) |
i32.eq |
(if |
(then |
(local.get $val) |
(global.set $g_nth_element_i) |
) |
) |
) |
;; Helper around the groupBy trick to access arr[n] |
(func $array_get_nth_element (param $arr externref) (param $n i32) |
(result externref) |
(local.get $n) |
(global.set $g_n) |
(call $groupBy_i (local.get $arr) (ref.func $save_nth_element)) |
drop |
(global.get $g_nth_element) |
) |
;; Same as $array_get_nth_element but result is i32 |
;; This is useful if we want to do something with the result in WASM land |
;; (e.g. compare it to another integer) |
(func $array_get_nth_element_i (param $arr externref) (param $n i32) |
(result i32) |
(local.get $n) |
(global.set $g_n) |
(call $groupBy_i (local.get $arr) (ref.func $save_nth_element_i)) |
drop |
(global.get $g_nth_element_i) |
) |
;; Helper to obtain the n-th property (usually a method) of an object |
;; NOTE: this order is JS-engine specific, hence we figure out offset |
;; dynamically later |
;; NOTE2: you'd think we can call Object.values() instead (and not need |
;; 'value'), but it only lists enumerable properties. In our case, |
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