mirror of
https://github.com/rust-lang/rust.git
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improper_ctypes_definitions: allow Box
This commit stops linting against `Box` in `extern "C" fn`s for the `improper_ctypes_definitions` lint - boxes are documented to be FFI-safe. Signed-off-by: David Wood <david@davidtw.co>
This commit is contained in:
David Wood
parent
e2e29de5e8
commit
95df8024e7
@ -531,6 +531,11 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
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match ty.kind {
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ty::FnPtr(_) => true,
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ty::Ref(..) => true,
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ty::Adt(def, _)
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if def.is_box() && matches!(self.mode, ImproperCTypesMode::Definitions) =>
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{
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true
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}
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ty::Adt(def, substs) if def.repr.transparent() && !def.is_union() => {
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let guaranteed_nonnull_optimization = self
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.cx
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@ -558,7 +563,7 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
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}
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/// Check if this enum can be safely exported based on the "nullable pointer optimization".
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/// Currently restricted to function pointers, references, `core::num::NonZero*`,
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/// Currently restricted to function pointers, boxes, references, `core::num::NonZero*`,
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/// `core::ptr::NonNull`, and `#[repr(transparent)]` newtypes.
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fn is_repr_nullable_ptr(
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&self,
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@ -692,6 +697,12 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
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}
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match ty.kind {
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ty::Adt(def, _)
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if def.is_box() && matches!(self.mode, ImproperCTypesMode::Definitions) =>
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{
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FfiSafe
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}
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ty::Adt(def, substs) => {
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if def.is_phantom_data() {
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return FfiPhantom(ty);
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@ -71,7 +71,8 @@ pub extern "C" fn str_type(p: &str) { }
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//~^ ERROR: uses type `str`
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pub extern "C" fn box_type(p: Box<u32>) { }
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//~^ ERROR uses type `std::boxed::Box<u32>`
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pub extern "C" fn opt_box_type(p: Option<Box<u32>>) { }
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pub extern "C" fn char_type(p: char) { }
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//~^ ERROR uses type `char`
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@ -106,7 +107,6 @@ pub extern "C" fn fn_type2(p: fn()) { }
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//~^ ERROR uses type `fn()`
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pub extern "C" fn fn_contained(p: RustBadRet) { }
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//~^ ERROR: uses type `std::boxed::Box<u32>`
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pub extern "C" fn transparent_i128(p: TransparentI128) { }
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//~^ ERROR: uses type `i128`
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@ -115,7 +115,6 @@ pub extern "C" fn transparent_str(p: TransparentStr) { }
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//~^ ERROR: uses type `str`
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pub extern "C" fn transparent_fn(p: TransparentBadFn) { }
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//~^ ERROR: uses type `std::boxed::Box<u32>`
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pub extern "C" fn good3(fptr: Option<extern fn()>) { }
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@ -21,17 +21,8 @@ LL | pub extern "C" fn str_type(p: &str) { }
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= help: consider using `*const u8` and a length instead
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= note: string slices have no C equivalent
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error: `extern` fn uses type `std::boxed::Box<u32>`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:73:31
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LL | pub extern "C" fn box_type(p: Box<u32>) { }
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| ^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
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= note: this struct has unspecified layout
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error: `extern` fn uses type `char`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:76:32
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--> $DIR/lint-ctypes-fn.rs:77:32
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LL | pub extern "C" fn char_type(p: char) { }
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| ^^^^ not FFI-safe
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@ -40,7 +31,7 @@ LL | pub extern "C" fn char_type(p: char) { }
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= note: the `char` type has no C equivalent
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error: `extern` fn uses type `i128`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:79:32
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--> $DIR/lint-ctypes-fn.rs:80:32
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LL | pub extern "C" fn i128_type(p: i128) { }
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| ^^^^ not FFI-safe
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@ -48,7 +39,7 @@ LL | pub extern "C" fn i128_type(p: i128) { }
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= note: 128-bit integers don't currently have a known stable ABI
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error: `extern` fn uses type `u128`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:82:32
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--> $DIR/lint-ctypes-fn.rs:83:32
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LL | pub extern "C" fn u128_type(p: u128) { }
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| ^^^^ not FFI-safe
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@ -56,7 +47,7 @@ LL | pub extern "C" fn u128_type(p: u128) { }
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= note: 128-bit integers don't currently have a known stable ABI
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error: `extern` fn uses type `(i32, i32)`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:85:33
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--> $DIR/lint-ctypes-fn.rs:86:33
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LL | pub extern "C" fn tuple_type(p: (i32, i32)) { }
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| ^^^^^^^^^^ not FFI-safe
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@ -65,7 +56,7 @@ LL | pub extern "C" fn tuple_type(p: (i32, i32)) { }
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= note: tuples have unspecified layout
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error: `extern` fn uses type `(i32, i32)`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:88:34
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--> $DIR/lint-ctypes-fn.rs:89:34
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LL | pub extern "C" fn tuple_type2(p: I32Pair) { }
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| ^^^^^^^ not FFI-safe
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@ -74,7 +65,7 @@ LL | pub extern "C" fn tuple_type2(p: I32Pair) { }
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= note: tuples have unspecified layout
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error: `extern` fn uses type `ZeroSize`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:91:32
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--> $DIR/lint-ctypes-fn.rs:92:32
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LL | pub extern "C" fn zero_size(p: ZeroSize) { }
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| ^^^^^^^^ not FFI-safe
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@ -88,7 +79,7 @@ LL | pub struct ZeroSize;
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| ^^^^^^^^^^^^^^^^^^^^
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error: `extern` fn uses type `ZeroSizeWithPhantomData`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:94:40
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--> $DIR/lint-ctypes-fn.rs:95:40
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LL | pub extern "C" fn zero_size_phantom(p: ZeroSizeWithPhantomData) { }
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| ^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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@ -101,7 +92,7 @@ LL | pub struct ZeroSizeWithPhantomData(PhantomData<i32>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: `extern` fn uses type `std::marker::PhantomData<bool>`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:97:51
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--> $DIR/lint-ctypes-fn.rs:98:51
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LL | pub extern "C" fn zero_size_phantom_toplevel() -> PhantomData<bool> {
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| ^^^^^^^^^^^^^^^^^ not FFI-safe
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@ -109,7 +100,7 @@ LL | pub extern "C" fn zero_size_phantom_toplevel() -> PhantomData<bool> {
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= note: composed only of `PhantomData`
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error: `extern` fn uses type `fn()`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:102:30
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--> $DIR/lint-ctypes-fn.rs:103:30
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LL | pub extern "C" fn fn_type(p: RustFn) { }
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| ^^^^^^ not FFI-safe
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@ -118,7 +109,7 @@ LL | pub extern "C" fn fn_type(p: RustFn) { }
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= note: this function pointer has Rust-specific calling convention
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error: `extern` fn uses type `fn()`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:105:31
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--> $DIR/lint-ctypes-fn.rs:106:31
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LL | pub extern "C" fn fn_type2(p: fn()) { }
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| ^^^^ not FFI-safe
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@ -126,15 +117,6 @@ LL | pub extern "C" fn fn_type2(p: fn()) { }
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= help: consider using an `extern fn(...) -> ...` function pointer instead
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= note: this function pointer has Rust-specific calling convention
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error: `extern` fn uses type `std::boxed::Box<u32>`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:108:35
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LL | pub extern "C" fn fn_contained(p: RustBadRet) { }
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| ^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
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= note: this struct has unspecified layout
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error: `extern` fn uses type `i128`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:111:39
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@ -152,17 +134,8 @@ LL | pub extern "C" fn transparent_str(p: TransparentStr) { }
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= help: consider using `*const u8` and a length instead
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= note: string slices have no C equivalent
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error: `extern` fn uses type `std::boxed::Box<u32>`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:117:37
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LL | pub extern "C" fn transparent_fn(p: TransparentBadFn) { }
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| ^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
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= note: this struct has unspecified layout
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error: `extern` fn uses type `std::marker::PhantomData<bool>`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:161:43
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--> $DIR/lint-ctypes-fn.rs:160:43
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LL | pub extern "C" fn unused_generic2<T>() -> PhantomData<bool> {
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| ^^^^^^^^^^^^^^^^^ not FFI-safe
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@ -170,7 +143,7 @@ LL | pub extern "C" fn unused_generic2<T>() -> PhantomData<bool> {
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= note: composed only of `PhantomData`
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error: `extern` fn uses type `std::vec::Vec<T>`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:174:39
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--> $DIR/lint-ctypes-fn.rs:173:39
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LL | pub extern "C" fn used_generic4<T>(x: Vec<T>) { }
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| ^^^^^^ not FFI-safe
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@ -179,7 +152,7 @@ LL | pub extern "C" fn used_generic4<T>(x: Vec<T>) { }
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= note: this struct has unspecified layout
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error: `extern` fn uses type `std::vec::Vec<T>`, which is not FFI-safe
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--> $DIR/lint-ctypes-fn.rs:177:41
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--> $DIR/lint-ctypes-fn.rs:176:41
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LL | pub extern "C" fn used_generic5<T>() -> Vec<T> {
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| ^^^^^^ not FFI-safe
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@ -187,5 +160,5 @@ LL | pub extern "C" fn used_generic5<T>() -> Vec<T> {
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= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
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= note: this struct has unspecified layout
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error: aborting due to 20 previous errors
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error: aborting due to 17 previous errors
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@ -48,6 +48,8 @@ extern {
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pub fn slice_type(p: &[u32]); //~ ERROR: uses type `[u32]`
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pub fn str_type(p: &str); //~ ERROR: uses type `str`
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pub fn box_type(p: Box<u32>); //~ ERROR uses type `std::boxed::Box<u32>`
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pub fn opt_box_type(p: Option<Box<u32>>);
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//~^ ERROR uses type `std::option::Option<std::boxed::Box<u32>>`
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pub fn char_type(p: char); //~ ERROR uses type `char`
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pub fn i128_type(p: i128); //~ ERROR uses type `i128`
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pub fn u128_type(p: u128); //~ ERROR uses type `u128`
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@ -58,8 +58,17 @@ LL | pub fn box_type(p: Box<u32>);
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= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
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= note: this struct has unspecified layout
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error: `extern` block uses type `std::option::Option<std::boxed::Box<u32>>`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:51:28
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LL | pub fn opt_box_type(p: Option<Box<u32>>);
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| ^^^^^^^^^^^^^^^^ not FFI-safe
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|
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
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= note: enum has no representation hint
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error: `extern` block uses type `char`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:51:25
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--> $DIR/lint-ctypes.rs:53:25
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|
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LL | pub fn char_type(p: char);
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| ^^^^ not FFI-safe
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@ -68,7 +77,7 @@ LL | pub fn char_type(p: char);
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= note: the `char` type has no C equivalent
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error: `extern` block uses type `i128`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:52:25
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--> $DIR/lint-ctypes.rs:54:25
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|
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LL | pub fn i128_type(p: i128);
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| ^^^^ not FFI-safe
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@ -76,7 +85,7 @@ LL | pub fn i128_type(p: i128);
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= note: 128-bit integers don't currently have a known stable ABI
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error: `extern` block uses type `u128`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:53:25
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--> $DIR/lint-ctypes.rs:55:25
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|
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LL | pub fn u128_type(p: u128);
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| ^^^^ not FFI-safe
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@ -84,7 +93,7 @@ LL | pub fn u128_type(p: u128);
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= note: 128-bit integers don't currently have a known stable ABI
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error: `extern` block uses type `dyn std::clone::Clone`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:54:26
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--> $DIR/lint-ctypes.rs:56:26
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|
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LL | pub fn trait_type(p: &dyn Clone);
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| ^^^^^^^^^^ not FFI-safe
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@ -92,7 +101,7 @@ LL | pub fn trait_type(p: &dyn Clone);
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= note: trait objects have no C equivalent
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error: `extern` block uses type `(i32, i32)`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:55:26
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--> $DIR/lint-ctypes.rs:57:26
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|
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LL | pub fn tuple_type(p: (i32, i32));
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| ^^^^^^^^^^ not FFI-safe
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@ -101,7 +110,7 @@ LL | pub fn tuple_type(p: (i32, i32));
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= note: tuples have unspecified layout
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error: `extern` block uses type `(i32, i32)`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:56:27
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--> $DIR/lint-ctypes.rs:58:27
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|
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LL | pub fn tuple_type2(p: I32Pair);
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| ^^^^^^^ not FFI-safe
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@ -110,7 +119,7 @@ LL | pub fn tuple_type2(p: I32Pair);
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= note: tuples have unspecified layout
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error: `extern` block uses type `ZeroSize`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:57:25
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--> $DIR/lint-ctypes.rs:59:25
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|
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LL | pub fn zero_size(p: ZeroSize);
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| ^^^^^^^^ not FFI-safe
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@ -124,7 +133,7 @@ LL | pub struct ZeroSize;
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| ^^^^^^^^^^^^^^^^^^^^
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error: `extern` block uses type `ZeroSizeWithPhantomData`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:58:33
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--> $DIR/lint-ctypes.rs:60:33
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|
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LL | pub fn zero_size_phantom(p: ZeroSizeWithPhantomData);
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| ^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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@ -137,7 +146,7 @@ LL | pub struct ZeroSizeWithPhantomData(::std::marker::PhantomData<i32>);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: `extern` block uses type `std::marker::PhantomData<bool>`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:61:12
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--> $DIR/lint-ctypes.rs:63:12
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|
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LL | -> ::std::marker::PhantomData<bool>;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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@ -145,7 +154,7 @@ LL | -> ::std::marker::PhantomData<bool>;
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= note: composed only of `PhantomData`
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error: `extern` block uses type `fn()`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:62:23
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--> $DIR/lint-ctypes.rs:64:23
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|
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LL | pub fn fn_type(p: RustFn);
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| ^^^^^^ not FFI-safe
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@ -154,7 +163,7 @@ LL | pub fn fn_type(p: RustFn);
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= note: this function pointer has Rust-specific calling convention
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error: `extern` block uses type `fn()`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:63:24
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--> $DIR/lint-ctypes.rs:65:24
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|
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LL | pub fn fn_type2(p: fn());
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| ^^^^ not FFI-safe
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@ -163,7 +172,7 @@ LL | pub fn fn_type2(p: fn());
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= note: this function pointer has Rust-specific calling convention
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error: `extern` block uses type `std::boxed::Box<u32>`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:64:28
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--> $DIR/lint-ctypes.rs:66:28
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|
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LL | pub fn fn_contained(p: RustBadRet);
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| ^^^^^^^^^^ not FFI-safe
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@ -172,7 +181,7 @@ LL | pub fn fn_contained(p: RustBadRet);
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= note: this struct has unspecified layout
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error: `extern` block uses type `i128`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:65:32
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--> $DIR/lint-ctypes.rs:67:32
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|
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LL | pub fn transparent_i128(p: TransparentI128);
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| ^^^^^^^^^^^^^^^ not FFI-safe
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@ -180,7 +189,7 @@ LL | pub fn transparent_i128(p: TransparentI128);
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= note: 128-bit integers don't currently have a known stable ABI
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error: `extern` block uses type `str`, which is not FFI-safe
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--> $DIR/lint-ctypes.rs:66:31
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--> $DIR/lint-ctypes.rs:68:31
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|
|
||||
LL | pub fn transparent_str(p: TransparentStr);
|
||||
| ^^^^^^^^^^^^^^ not FFI-safe
|
||||
@ -189,7 +198,7 @@ LL | pub fn transparent_str(p: TransparentStr);
|
||||
= note: string slices have no C equivalent
|
||||
|
||||
error: `extern` block uses type `std::boxed::Box<u32>`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes.rs:67:30
|
||||
--> $DIR/lint-ctypes.rs:69:30
|
||||
|
|
||||
LL | pub fn transparent_fn(p: TransparentBadFn);
|
||||
| ^^^^^^^^^^^^^^^^ not FFI-safe
|
||||
@ -198,7 +207,7 @@ LL | pub fn transparent_fn(p: TransparentBadFn);
|
||||
= note: this struct has unspecified layout
|
||||
|
||||
error: `extern` block uses type `[u8; 8]`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes.rs:68:27
|
||||
--> $DIR/lint-ctypes.rs:70:27
|
||||
|
|
||||
LL | pub fn raw_array(arr: [u8; 8]);
|
||||
| ^^^^^^^ not FFI-safe
|
||||
@ -207,7 +216,7 @@ LL | pub fn raw_array(arr: [u8; 8]);
|
||||
= note: passing raw arrays by value is not FFI-safe
|
||||
|
||||
error: `extern` block uses type `u128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes.rs:70:34
|
||||
--> $DIR/lint-ctypes.rs:72:34
|
||||
|
|
||||
LL | pub static static_u128_type: u128;
|
||||
| ^^^^ not FFI-safe
|
||||
@ -215,12 +224,12 @@ LL | pub static static_u128_type: u128;
|
||||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: `extern` block uses type `u128`, which is not FFI-safe
|
||||
--> $DIR/lint-ctypes.rs:71:40
|
||||
--> $DIR/lint-ctypes.rs:73:40
|
||||
|
|
||||
LL | pub static static_u128_array_type: [u128; 16];
|
||||
| ^^^^^^^^^^ not FFI-safe
|
||||
|
|
||||
= note: 128-bit integers don't currently have a known stable ABI
|
||||
|
||||
error: aborting due to 23 previous errors
|
||||
error: aborting due to 24 previous errors
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user