Revamp foreign code not to consider the Rust modes. This requires #5298
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adjusting a few foreign functions that were declared with by-ref mode. This also allows us to remove by-val mode in the near future. With copy mode, though, we have to be careful because Rust will implicitly pass somethings by pointer but this may not be the C ABI rules. For example, rust will pass a struct Foo as a Foo*. So I added some code into the adapters to fix this (though the C ABI rules may put the pointer back, oh well). This patch also includes a lint mode for the use of by-ref mode in foreign functions as the semantics of this have changed.
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Note: I did some 'tidying up' while I was editing this code. I expected to need deeper changes than I did, in retrospect I could have this patch more targeted, but oh well. |
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This is done in two steps: First, we make foreign functions not consider modes at all. This is because previously ++ mode was the only way to pass structs to foreign functions and so forth. We also add a lint mode warning if you use `&&` mode in a foreign function, since the semantics of that change (it used to pass a pointer to the C function, now it doesn't). Then, we remove by value and make it equivalent to `+` mode. At the same time, we stop parsing `-` mode and convert all uses of it to `+` mode (it was already being parsed to `+` mode anyhow). This obsoletes pull request #5298. r? @brson
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…ip1995,Manishearth needless_doc_main: only check rust code This fixes rust-lang#5280 by checking the language attribute on code blocks. --- changelog: none
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Revamp foreign code not to consider the Rust modes. This requires
adjusting a few foreign functions that were declared with by-ref
mode. This also allows us to remove by-val mode in the near future.
With copy mode, though, we have to be careful because Rust will implicitly pass
somethings by pointer but this may not be the C ABI rules. For example, rust
will pass a
struct Fooas aFoo*. So I added some code into the adapters tofix this (though the C ABI rules may put the pointer back, oh well).
This patch also includes a lint mode for the use of by-ref mode
in foreign functions as the semantics of this have changed.
r? @brson