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a1764f7690
This is a follow-on to the earlier work in reducing string copies, mainly focused on ensuring that ASCII strings are easy to provide to the JS runtime. While we are replacing a 16-byte reference in a number of places with a 24-byte structure (measured via `std::mem::size_of`), the reduction in copies wins out over the additional size of the arguments passed into functions. Benchmarking shows approximately the same if not slightly less wallclock time/instructions retired, but I believe this continues to open up further refactoring opportunities.
36 lines
1 KiB
Rust
36 lines
1 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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//! This example shows that op-panics currently result in UB (likely "failed to initiate panic")
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//! without a custom panic hook that aborts the process or -C panic=abort.
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//!
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//! This happens due to the UB of panicking in an extern "C",
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//! given how ops are reduced via rusty_v8::MapFnTo
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//! See:
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//! - https://github.com/rust-lang/rust/issues/74990
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//! - https://rust-lang.github.io/rfcs/2945-c-unwind-abi.html
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use deno_core::op;
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use deno_core::Extension;
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use deno_core::JsRuntime;
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use deno_core::RuntimeOptions;
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// This is a hack to make the `#[op]` macro work with
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// deno_core examples.
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// You can remove this:
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use deno_core::*;
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fn main() {
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#[op]
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fn op_panik() {
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panic!("panik !!!")
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}
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let extensions = vec![Extension::builder("my_ext")
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.ops(vec![op_panik::decl()])
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.build()];
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let mut rt = JsRuntime::new(RuntimeOptions {
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extensions,
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..Default::default()
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});
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rt.execute_script_static("panik", "Deno.core.ops.op_panik()")
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.unwrap();
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}
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