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internal/jsutil: Optimize byteLength calls by using bind

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This commit is contained in:
Hajime Hoshi 2021-09-04 16:13:58 +09:00
parent ffe9a6f72d
commit 65e148700f
1 changed files with 45 additions and 3 deletions
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48
internal/jsutil/buf_js.go
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@ -18,7 +18,10 @@ import (
"syscall/js" "syscall/js"
) )
var go2cpp = js.Global().Get("go2cpp").Truthy()
var ( var (
object = js.Global().Get("Object")
arrayBuffer = js.Global().Get("ArrayBuffer") arrayBuffer = js.Global().Get("ArrayBuffer")
uint8Array = js.Global().Get("Uint8Array") uint8Array = js.Global().Get("Uint8Array")
float32Array = js.Global().Get("Float32Array") float32Array = js.Global().Get("Float32Array")
@ -37,18 +40,57 @@ var (
temporaryFloat32Array = float32Array.New(temporaryArrayBuffer) temporaryFloat32Array = float32Array.New(temporaryArrayBuffer)
) )
var (
temporaryArrayBufferByteLengthFunc js.Value
temporaryUint8ArrayByteLengthFunc js.Value
temporaryFloat32ArrayByteLengthFunc js.Value
)
func objectPrototype() {
}
func init() {
if go2cpp {
return
}
temporaryArrayBufferByteLengthFunc = object.Call("getOwnPropertyDescriptor", arrayBuffer.Get("prototype"), "byteLength").Get("get").Call("bind", temporaryArrayBuffer)
temporaryUint8ArrayByteLengthFunc = object.Call("getOwnPropertyDescriptor", object.Call("getPrototypeOf", uint8Array).Get("prototype"), "byteLength").Get("get").Call("bind", temporaryUint8Array)
temporaryFloat32ArrayByteLengthFunc = object.Call("getOwnPropertyDescriptor", object.Call("getPrototypeOf", float32Array).Get("prototype"), "byteLength").Get("get").Call("bind", temporaryFloat32Array)
}
func temporaryArrayBufferByteLength() int {
if go2cpp {
return temporaryArrayBuffer.Get("byteLength").Int()
}
return temporaryArrayBufferByteLengthFunc.Invoke().Int()
}
func temporaryUint8ArrayByteLength() int {
if go2cpp {
return temporaryUint8Array.Get("byteLength").Int()
}
return temporaryUint8ArrayByteLengthFunc.Invoke().Int()
}
func temporaryFloat32ArrayByteLength() int {
if go2cpp {
return temporaryFloat32Array.Get("byteLength").Int()
}
return temporaryFloat32ArrayByteLengthFunc.Invoke().Int()
}
func ensureTemporaryArrayBufferSize(byteLength int) { func ensureTemporaryArrayBufferSize(byteLength int) {
bufl := temporaryArrayBuffer.Get("byteLength").Int() bufl := temporaryArrayBufferByteLength()
if bufl < byteLength { if bufl < byteLength {
for bufl < byteLength { for bufl < byteLength {
bufl *= 2 bufl *= 2
} }
temporaryArrayBuffer = arrayBuffer.New(bufl) temporaryArrayBuffer = arrayBuffer.New(bufl)
} }
if temporaryUint8Array.Get("byteLength").Int() < bufl { if temporaryUint8ArrayByteLength() < bufl {
temporaryUint8Array = uint8Array.New(temporaryArrayBuffer) temporaryUint8Array = uint8Array.New(temporaryArrayBuffer)
} }
if temporaryFloat32Array.Get("byteLength").Int() < bufl { if temporaryFloat32ArrayByteLength() < bufl {
temporaryFloat32Array = float32Array.New(temporaryArrayBuffer) temporaryFloat32Array = float32Array.New(temporaryArrayBuffer)
} }
} }