Add fn for splitting borrow of memory & data in Ctx, use in WASI #1069
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MarkMcCaskey
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📦 lib-deprecated
nlewycky
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Dec 16, 2019
lib/runtime-core/src/vm.rs
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| @@ -401,6 +401,21 @@ impl Ctx { | |||
| } | |||
| } | |||
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| /// Splits the borrow, getting both Memory and a mutable reference to | |||
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"Splits the borrow" sounds like a function that takes a borrow and splits it. Instead, this is a variation on memory that returns a Memory and a mutable reference to the Ctx.data.
Also, I'd replace "a hostcall" with simply "the host".
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It's required by the Rust borrow checker; it's a split borrow in that one borrow comes in and 2 come out that otherwise is not possible with safe Rust. There's a function for splitting borrows over slices I believe &mut [u8] -> (&mut [u8], &mut [u8]) which is where I got the terminology from
nlewycky
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Dec 16, 2019
Co-Authored-By: nlewycky <[email protected]>
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1069: Add fn for splitting borrow of memory & data in Ctx, use in WASI r=MarkMcCaskey a=MarkMcCaskey Fixes a soundness issue / some undefined behavior # Review - [ ] Add a short description of the the change to the CHANGELOG.md file Co-authored-by: Mark McCaskey <[email protected]> Co-authored-by: Mark McCaskey <[email protected]>
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Dec 17, 2019
1069: Add fn for splitting borrow of memory & data in Ctx, use in WASI r=MarkMcCaskey a=MarkMcCaskey Fixes a soundness issue / some undefined behavior # Review - [ ] Add a short description of the the change to the CHANGELOG.md file Co-authored-by: Mark McCaskey <[email protected]> Co-authored-by: Mark McCaskey <[email protected]>
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Fixes a soundness issue / some undefined behavior
Review