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Rename the lint to clashing_extern_declarations.

Browse Source 
Also, run RustFmt on the clashing_extern_fn test case and update
stderrs.
This commit is contained in:
jumbatm 2020-06-28 10:11:04 +10:00
parent 394e1b40d2
commit c72a5dd9d3
12 changed files with 91 additions and 64 deletions
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4
src/libcore/lib.rs
View File

@ -279,9 +279,9 @@ pub mod primitive;
// crate uses the this crate as its libcore.
#[path = "../stdarch/crates/core_arch/src/mod.rs"]
#[allow(missing_docs, missing_debug_implementations, dead_code, unused_imports)]
// FIXME: This annotation should be moved into rust-lang/stdarch after clashing_extern_decl is
// FIXME: This annotation should be moved into rust-lang/stdarch after clashing_extern_declarations is
// merged. It currently cannot because bootstrap fails as the lint hasn't been defined yet.
#[cfg_attr(not(bootstrap), allow(clashing_extern_decl))]
#[cfg_attr(not(bootstrap), allow(clashing_extern_declarations))]
#[unstable(feature = "stdsimd", issue = "48556")]
mod core_arch;

18
src/librustc_lint/builtin.rs
View File

@ -2055,12 +2055,12 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidValue {
}
declare_lint! {
pub CLASHING_EXTERN_DECL,
pub CLASHING_EXTERN_DECLARATIONS,
Warn,
"detects when an extern fn has been declared with the same name but different types"
}
pub struct ClashingExternDecl {
pub struct ClashingExternDeclarations {
seen_decls: FxHashMap<Symbol, HirId>,
}
@ -2083,9 +2083,9 @@ impl SymbolName {
}
}
impl ClashingExternDecl {
impl ClashingExternDeclarations {
crate fn new() -> Self {
ClashingExternDecl { seen_decls: FxHashMap::default() }
ClashingExternDeclarations { seen_decls: FxHashMap::default() }
}
/// Insert a new foreign item into the seen set. If a symbol with the same name already exists
/// for the item, return its HirId without updating the set.
@ -2211,18 +2211,18 @@ impl ClashingExternDecl {
}
}
impl_lint_pass!(ClashingExternDecl => [CLASHING_EXTERN_DECL]);
impl_lint_pass!(ClashingExternDeclarations => [CLASHING_EXTERN_DECLARATIONS]);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ClashingExternDecl {
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ClashingExternDeclarations {
fn check_foreign_item(&mut self, cx: &LateContext<'a, 'tcx>, this_fi: &hir::ForeignItem<'_>) {
trace!("ClashingExternDecl: check_foreign_item: {:?}", this_fi);
trace!("ClashingExternDeclarations: check_foreign_item: {:?}", this_fi);
if let ForeignItemKind::Fn(..) = this_fi.kind {
let tcx = *&cx.tcx;
if let Some(existing_hid) = self.insert(tcx, this_fi) {
let existing_decl_ty = tcx.type_of(tcx.hir().local_def_id(existing_hid));
let this_decl_ty = tcx.type_of(tcx.hir().local_def_id(this_fi.hir_id));
debug!(
"ClashingExternDecl: Comparing existing {:?}: {:?} to this {:?}: {:?}",
"ClashingExternDeclarations: Comparing existing {:?}: {:?} to this {:?}: {:?}",
existing_hid, existing_decl_ty, this_fi.hir_id, this_decl_ty
);
// Check that the declarations match.
@ -2239,7 +2239,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ClashingExternDecl {
};
// Finally, emit the diagnostic.
tcx.struct_span_lint_hir(
CLASHING_EXTERN_DECL,
CLASHING_EXTERN_DECLARATIONS,
this_fi.hir_id,
get_relevant_span(this_fi),
|lint| {

2
src/librustc_lint/lib.rs
View File

@ -155,7 +155,7 @@ macro_rules! late_lint_passes {
// and change this to a module lint pass
MissingDebugImplementations: MissingDebugImplementations::default(),
ArrayIntoIter: ArrayIntoIter,
ClashingExternDecl: ClashingExternDecl::new(),
ClashingExternDeclarations: ClashingExternDeclarations::new(),
]
);
};

4
src/libstd/sys/unix/args.rs
View File

@ -205,7 +205,7 @@ mod imp {
#[cfg(target_arch = "aarch64")]
extern "C" {
fn objc_msgSend(obj: NsId, sel: Sel) -> NsId;
#[cfg_attr(not(bootstrap), allow(clashing_extern_decl))]
#[cfg_attr(not(bootstrap), allow(clashing_extern_declarations))]
#[link_name = "objc_msgSend"]
fn objc_msgSend_ul(obj: NsId, sel: Sel, i: libc::c_ulong) -> NsId;
}
@ -213,7 +213,7 @@ mod imp {
#[cfg(not(target_arch = "aarch64"))]
extern "C" {
fn objc_msgSend(obj: NsId, sel: Sel, ...) -> NsId;
#[cfg_attr(not(bootstrap), allow(clashing_extern_decl))]
#[cfg_attr(not(bootstrap), allow(clashing_extern_declarations))]
#[link_name = "objc_msgSend"]
fn objc_msgSend_ul(obj: NsId, sel: Sel, ...) -> NsId;
}

2
src/test/ui/issues/issue-1866.rs
View File

@ -1,7 +1,7 @@
// build-pass
#![allow(dead_code)]
#![allow(non_camel_case_types)]
#![warn(clashing_extern_decl)]
#![warn(clashing_extern_declarations)]
// pretty-expanded FIXME #23616

4
src/test/ui/issues/issue-1866.stderr
View File

@ -10,8 +10,8 @@ LL | pub fn rust_task_is_unwinding(rt: *const rust_task) -> bool;
note: the lint level is defined here
--> $DIR/issue-1866.rs:4:9
|
LL | #![warn(clashing_extern_decl)]
| ^^^^^^^^^^^^^^^^^^^^
LL | #![warn(clashing_extern_declarations)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: expected `unsafe extern "C" fn(*const usize) -> bool`
found `unsafe extern "C" fn(*const bool) -> bool`

2
src/test/ui/issues/issue-5791.rs
View File

@ -1,6 +1,6 @@
// run-pass
#![allow(dead_code)]
#![warn(clashing_extern_decl)]
#![warn(clashing_extern_declarations)]
// pretty-expanded FIXME #23616
extern {

4
src/test/ui/issues/issue-5791.stderr
View File

@ -12,8 +12,8 @@ LL | | fn malloc2(len: i32, foo: i32) -> *const u8;
note: the lint level is defined here
--> $DIR/issue-5791.rs:3:9
|
LL | #![warn(clashing_extern_decl)]
| ^^^^^^^^^^^^^^^^^^^^
LL | #![warn(clashing_extern_declarations)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: expected `unsafe extern "C" fn(i32) -> *const u8`
found `unsafe extern "C" fn(i32, i32) -> *const u8`

87
src/test/ui/lint/clashing-extern-fn.rs
View File

@ -1,17 +1,17 @@
// check-pass
// aux-build:external_extern_fn.rs
#![crate_type = "lib"]
#![warn(clashing_extern_decl)]
#![warn(clashing_extern_declarations)]
extern crate external_extern_fn;
extern {
extern "C" {
fn clash(x: u8);
fn no_clash(x: u8);
}
fn redeclared_different_signature() {
extern {
extern "C" {
fn clash(x: u64); //~ WARN `clash` redeclared with a different signature
}
@ -22,7 +22,7 @@ fn redeclared_different_signature() {
}
fn redeclared_same_signature() {
extern {
extern "C" {
fn no_clash(x: u8);
}
unsafe {
@ -30,12 +30,12 @@ fn redeclared_same_signature() {
}
}
extern {
extern "C" {
fn extern_fn(x: u64);
}
fn extern_clash() {
extern {
extern "C" {
fn extern_fn(x: u32); //~ WARN `extern_fn` redeclared with a different signature
}
unsafe {
@ -49,7 +49,7 @@ fn extern_no_clash() {
crate::extern_fn(123);
}
}
extern {
extern "C" {
fn some_other_new_name(x: i16);
#[link_name = "extern_link_name"]
@ -60,7 +60,7 @@ extern {
}
fn link_name_clash() {
extern {
extern "C" {
fn extern_link_name(x: u32);
//~^ WARN `extern_link_name` redeclared with a different signature
@ -75,85 +75,112 @@ fn link_name_clash() {
}
mod a {
extern {
extern "C" {
fn different_mod(x: u8);
}
}
mod b {
extern {
extern "C" {
fn different_mod(x: u64); //~ WARN `different_mod` redeclared with a different signature
}
}
extern {
extern "C" {
fn variadic_decl(x: u8, ...);
}
fn variadic_clash() {
extern {
extern "C" {
fn variadic_decl(x: u8); //~ WARN `variadic_decl` redeclared with a different signature
}
}
#[no_mangle]
fn no_mangle_name(x: u8) { }
fn no_mangle_name(x: u8) {}
extern {
extern "C" {
#[link_name = "unique_link_name"]
fn link_name_specified(x: u8);
}
fn tricky_no_clash() {
extern {
extern "C" {
// Shouldn't warn, because the declaration above actually declares a different symbol (and
// Rust's name resolution rules around shadowing will handle this gracefully).
fn link_name_specified() -> u32;
// The case of a no_mangle name colliding with an extern decl (see #28179) is related but
// shouldn't be reported by ClashingExternDecl, because this is an example of unmangled
// name clash causing bad behaviour in functions with a defined body.
// shouldn't be reported by ClashingExternDeclarations, because this is an example of
// unmangled name clash causing bad behaviour in functions with a defined body.
fn no_mangle_name() -> u32;
}
}
mod banana {
mod one {
#[repr(C)] struct Banana { weight: u32, length: u16 }
extern "C" { fn weigh_banana(count: *const Banana) -> u64; }
#[repr(C)]
struct Banana {
weight: u32,
length: u16,
}
extern "C" {
fn weigh_banana(count: *const Banana) -> u64;
}
}
mod two {
#[repr(C)] struct Banana { weight: u32, length: u16 } // note: distinct type
// This should not trigger the lint because two::Banana is structurally equivalent to
// one::Banana.
extern "C" { fn weigh_banana(count: *const Banana) -> u64; }
#[repr(C)]
struct Banana {
weight: u32,
length: u16,
} // note: distinct type
extern "C" {
// This should not trigger the lint because two::Banana is structurally equivalent to
// one::Banana.
fn weigh_banana(count: *const Banana) -> u64;
}
}
mod three {
// This _should_ trigger the lint, because repr(packed) should generate a struct that has a
// different layout.
#[repr(packed)] struct Banana { weight: u32, length: u16 }
#[repr(packed)]
struct Banana {
weight: u32,
length: u16,
}
#[allow(improper_ctypes)]
extern "C" { fn weigh_banana(count: *const Banana) -> u64; }
//~^ WARN `weigh_banana` redeclared with a different signature
extern "C" {
fn weigh_banana(count: *const Banana) -> u64;
//~^ WARN `weigh_banana` redeclared with a different signature
}
}
}
mod sameish_members {
mod a {
#[repr(C)]
struct Point { x: i16, y: i16 }
struct Point {
x: i16,
y: i16,
}
extern "C" { fn draw_point(p: Point); }
extern "C" {
fn draw_point(p: Point);
}
}
mod b {
#[repr(C)]
struct Point { coordinates: [i16; 2] }
struct Point {
coordinates: [i16; 2],
}
// It's possible we are overconservative for this case, as accessing the elements of the
// coordinates array might end up correctly accessing `.x` and `.y`. However, this may not
// always be the case, for every architecture and situation. This is also a really odd
// thing to do anyway.
extern "C" { fn draw_point(p: Point); } //~ WARN `draw_point` redeclared with a different
extern "C" {
fn draw_point(p: Point); //~ WARN `draw_point` redeclared with a different
}
}
}

24
src/test/ui/lint/clashing-extern-fn.stderr
View File

@ -10,8 +10,8 @@ LL | fn clash(x: u64);
note: the lint level is defined here
--> $DIR/clashing-extern-fn.rs:4:9
|
LL | #![warn(clashing_extern_decl)]
| ^^^^^^^^^^^^^^^^^^^^
LL | #![warn(clashing_extern_declarations)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: expected `unsafe extern "C" fn(u8)`
found `unsafe extern "C" fn(u64)`
@ -94,25 +94,25 @@ LL | fn variadic_decl(x: u8);
found `unsafe extern "C" fn(u8)`
warning: `weigh_banana` redeclared with a different signature
--> $DIR/clashing-extern-fn.rs:137:22
--> $DIR/clashing-extern-fn.rs:154:13
|
LL | extern "C" { fn weigh_banana(count: *const Banana) -> u64; }
| --------------------------------------------- `weigh_banana` previously declared here
LL | fn weigh_banana(count: *const Banana) -> u64;
| --------------------------------------------- `weigh_banana` previously declared here
...
LL | extern "C" { fn weigh_banana(count: *const Banana) -> u64; }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration
LL | fn weigh_banana(count: *const Banana) -> u64;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration
|
= note: expected `unsafe extern "C" fn(*const banana::one::Banana) -> u64`
found `unsafe extern "C" fn(*const banana::three::Banana) -> u64`
warning: `draw_point` redeclared with a different signature
--> $DIR/clashing-extern-fn.rs:157:22
--> $DIR/clashing-extern-fn.rs:183:13
|
LL | extern "C" { fn draw_point(p: Point); }
| ------------------------ `draw_point` previously declared here
LL | fn draw_point(p: Point);
| ------------------------ `draw_point` previously declared here
...
LL | extern "C" { fn draw_point(p: Point); }
| ^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration
LL | fn draw_point(p: Point);
| ^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration
|
= note: expected `unsafe extern "C" fn(sameish_members::a::Point)`
found `unsafe extern "C" fn(sameish_members::b::Point)`

2
src/test/ui/lint/dead-code/lint-dead-code-3.rs
View File

@ -1,6 +1,6 @@
#![allow(unused_variables)]
#![allow(non_camel_case_types)]
#![allow(clashing_extern_decl)]
#![allow(clashing_extern_declarations)]
#![deny(dead_code)]
#![crate_type="lib"]

2
src/test/ui/parser/extern-abi-from-mac-literal-frag.rs
View File

@ -1,4 +1,4 @@
#![allow(clashing_extern_decl)]
#![allow(clashing_extern_declarations)]
// check-pass
// In this test we check that the parser accepts an ABI string when it