| commit | da3f3a3ab13fb335b525d74a38e6a8634a117fe5 | [log] [tgz] |
|---|---|---|
| author | Adrian Taylor <ade@hohum.me.uk> | Sun Oct 03 09:35:10 2021 -0700 |
| committer | Emilio Cobos Álvarez <emilio@crisal.io> | Wed Oct 27 19:23:31 2021 +0200 |
| tree | 818c72154e1969c1f093fa06e00b831e87830449 | |
| parent | 57853405463dd985dd49a2f14fb78bbf3595b1df [diff] |
Avoid case of a self-referential type alias.
This previously produced a type alias which referred to itself,
which was clearly wrong and resulted in downstream code recursing
infinitely.
The problem case (per bug #2102) is:
template <typename> class B{};
template <typename c> class C {
public:
using U = B<c>;
};
class A : C<A> {
U u;
};
As far as I can tell, we parse clang's definition of B<A>; that leads
us to parse A; to find it has a field U which turns out to be of type
B<A>. And so we hit the line in item.rs which says:
debug!("Avoiding recursion parsing type: {:?}", ty);
and bail out, returning the original item ID: hence, a self-
referential typedef is created.
The 'fix' in this PR creates an opaque type in this case instead,
to avoid later infinite loops. It would be preferable to avoid this
situation in the first place, but presumably that would require
us to split the parsing phase into two:
1) types
2) fields within those types.
Fixes #2102.
bindgenbindgen automatically generates Rust FFI bindings to C (and some C++) libraries.
For example, given the C header doggo.h:
typedef struct Doggo { int many; char wow; } Doggo; void eleven_out_of_ten_majestic_af(Doggo* pupper);
bindgen produces Rust FFI code allowing you to call into the doggo library's functions and use its types:
/* automatically generated by rust-bindgen 0.99.9 */ #[repr(C)] pub struct Doggo { pub many: ::std::os::raw::c_int, pub wow: ::std::os::raw::c_char, } extern "C" { pub fn eleven_out_of_ten_majestic_af(pupper: *mut Doggo); }
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The minimum supported Rust version is 1.46.
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End-users should set these environment variables to modify bindgen's behavior without modifying the source code of direct consumers of bindgen.
BINDGEN_EXTRA_CLANG_ARGS: extra arguments to pass to clang--sysroot=/path/to/sysroot-I"/path/with spaces"BINDGEN_EXTRA_CLANG_ARGS_<TARGET>: similar to BINDGEN_EXTRA_CLANG_ARGS, but used to set per-target arguments to pass to clang. Useful to set system include directories in a target-specific way in cross-compilation environments with multiple targets. Has precedence over BINDGEN_EXTRA_CLANG_ARGS.Additionally, bindgen uses libclang to parse C and C++ header files. To modify how bindgen searches for libclang, see the clang-sys documentation. For more details on how bindgen uses libclang, see the bindgen users guide.
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