Bug 172685
| Summary: | [JSC] Move WebCore jsDynamicDowncast mechanism to JSC | ||
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| Product: | WebKit | Reporter: | Yusuke Suzuki <ysuzuki> |
| Component: | JavaScriptCore | Assignee: | Yusuke Suzuki <ysuzuki> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | Normal | ||
| Priority: | P2 | ||
| Version: | WebKit Nightly Build | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
Yusuke Suzuki
We have bunch of adhoc functions, like, isSymbol, asSymbol, isJSMap etc.
We may easily miss the chance to use optimized casting.
For example,
jsDynamicCast<JSMap*>(vm, iterable)
If we do not have a fast overloading function (checking type() == JSMapType), it falls back to the usual slow inherits() code.
| Attachments | ||
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| Add attachment proposed patch, testcase, etc. |
Yusuke Suzuki
We already did it.
*** This bug has been marked as a duplicate of bug 183449 ***