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fix(runtime-core) Avoid crashing when missing host functions are allowed #1128

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merged 6 commits into from
Jan 10, 2020

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Hywan
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@Hywan Hywan commented Jan 9, 2020

Fix #1118.
Address #1121.

This PR fixes 2 things:

  • When droping the import backing, check that vm::FuncCtx isn't null before dropping it,
  • Use an always_trap as a placeholder host function when a host function is missing.

@Hywan Hywan added bug Something isn't working 🎉 enhancement New feature! 📦 lib-deprecated About the deprecated crates 🧪 tests I love tests labels Jan 9, 2020
@Hywan Hywan requested a review from MarkMcCaskey January 9, 2020 14:18
@Hywan Hywan requested a review from bjfish as a code owner January 9, 2020 14:18
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Looks good to me! Just want you to double check the public API changes and make sure we're at least aware of any breaking changes happening here

/// Get the underlying func pointer.
pub fn get_vm_func(&self) -> NonNull<vm::Func> {
self.func
}
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Is this a breaking change?

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@Hywan Hywan Jan 10, 2020

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Nop. It was implemented for Func<Kind = Wasm, …> only, now it's implemented for Kind = Wasm and Kind = Host.

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Hywan commented Jan 10, 2020

bors r+

bors bot added a commit that referenced this pull request Jan 10, 2020
1128: fix(runtime-core) Avoid crashing when missing host functions are allowed r=Hywan a=Hywan

Fix #1118. #1121 can be merged after

This PR fixes 2 things:

* When droping the import backing, check that `vm::FuncCtx` isn't null before dropping it,
* Use an `always_trap` as a placeholder host function when a host function is missing.

Co-authored-by: Ivan Enderlin <[email protected]>
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bors bot commented Jan 10, 2020

Build succeeded

@bors bors bot merged commit 43742cf into wasmerio:master Jan 10, 2020
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allow_missing_functions doesn't work in release mode
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