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refactor(runtime): move performance API to timers extension (#10818)

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Co-authored-by: Luca Casonato <hello@lcas.dev>
This commit is contained in:
Satya Rohith 2021-06-07 17:49:33 +05:30 • committed by GitHub
parent 89290741d1
commit b6400a25a0
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 82 additions and 67 deletions
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60
runtime/js/01_web_util.js
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@ -17,65 +17,6 @@
}
}
const objectCloneMemo = new WeakMap();
function cloneArrayBuffer(
srcBuffer,
srcByteOffset,
srcLength,
_cloneConstructor,
) {
// this function fudges the return type but SharedArrayBuffer is disabled for a while anyway
return srcBuffer.slice(
srcByteOffset,
srcByteOffset + srcLength,
);
}
/** Clone a value in a similar way to structured cloning. It is similar to a
* StructureDeserialize(StructuredSerialize(...)). */
function cloneValue(value) {
// Performance optimization for buffers, otherwise
// `serialize/deserialize` will allocate new buffer.
if (value instanceof ArrayBuffer) {
const cloned = cloneArrayBuffer(
value,
0,
value.byteLength,
ArrayBuffer,
);
objectCloneMemo.set(value, cloned);
return cloned;
}
if (ArrayBuffer.isView(value)) {
const clonedBuffer = cloneValue(value.buffer);
// Use DataViewConstructor type purely for type-checking, can be a
// DataView or TypedArray. They use the same constructor signature,
// only DataView has a length in bytes and TypedArrays use a length in
// terms of elements, so we adjust for that.
let length;
if (value instanceof DataView) {
length = value.byteLength;
} else {
length = value.length;
}
return new (value.constructor)(
clonedBuffer,
value.byteOffset,
length,
);
}
try {
return Deno.core.deserialize(Deno.core.serialize(value));
} catch (e) {
if (e instanceof TypeError) {
throw new DOMException("Uncloneable value", "DataCloneError");
}
throw e;
}
}
const handlerSymbol = Symbol("eventHandlers");
function makeWrappedHandler(handler) {
function wrappedHandler(...args) {
@ -114,6 +55,5 @@
illegalConstructorKey,
requiredArguments,
defineEventHandler,
cloneValue,
};
})(this);