Optimize {__proto__:null} object literal creation #1118
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Speeds up the common pattern of creating prototype-less objects by 40%:
TEST N TIME (ns) REF (ns) SCORE (%)
object_null 20000 124.50
TEST N TIME (ns) REF (ns) SCORE (%)
object_null 50000 74.30
It's so much faster the benchmarker decides to run it 50,000 times
instead of merely 20,000 times. Win.
bnoordhuis
commented
Jun 30, 2025
| goto exception; | ||
| break; | ||
| case OP_SPECIAL_OBJECT_NULL_PROTO: | ||
| *sp++ = JS_NewObjectProtoClass(ctx, JS_NULL, JS_CLASS_OBJECT); |
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I tried caching the shape for prototype-less objects on the JSContext (like it's done for ctx->array_shape) and calling JS_NewObjectFromShape(ctx, js_dup_shape(ctx->null_proto_shape), JS_CLASS_OBJECT) but it has no measurable impact on the micro-benchmark.
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Ping @saghul |
saghul
approved these changes
Jul 28, 2025
mochaaP
added a commit
to mcha-forks/quickjs
that referenced
this pull request
Oct 11, 2025
fixup: 0a00011 ("Optimize {__proto__:null} object literal creation", quickjs-ng#1118)
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Speeds up the common pattern of creating prototype-less objects by 40%:
It's so much faster the benchmarker decides to run it 50,000 times instead of merely 20,000 times. Win.