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Fix bad-c-variadic error being emitted multiple times

Browse source 
If a function incorrectly contains multiple `...` args, and is also not
foreign or `unsafe extern "C"`, only emit the latter error once.
This commit is contained in:
Nicholas Bishop 2023-10-29 17:04:52 -04:00
parent ec2b311914
commit 8508e65895
5 changed files with 31 additions and 43 deletions
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18
compiler/rustc_ast_passes/src/ast_validation.rs
View file

@ -485,6 +485,18 @@ fn check_foreign_item_ascii_only(&self, ident: Ident) {
/// Reject C-variadic type unless the function is foreign,
/// or free and `unsafe extern "C"` semantically.
fn check_c_variadic_type(&self, fk: FnKind<'a>) {
let variadic_spans: Vec<_> = fk
.decl()
.inputs
.iter()
.filter(|arg| matches!(arg.ty.kind, TyKind::CVarArgs))
.map(|arg| arg.span)
.collect();
if variadic_spans.is_empty() {
return;
}
match (fk.ctxt(), fk.header()) {
(Some(FnCtxt::Foreign), _) => return,
(Some(FnCtxt::Free), Some(header)) => match header.ext {
@ -499,11 +511,7 @@ fn check_c_variadic_type(&self, fk: FnKind<'a>) {
_ => {}
};
for Param { ty, span, .. } in &fk.decl().inputs {
if let TyKind::CVarArgs = ty.kind {
self.err_handler().emit_err(errors::BadCVariadic { span: *span });
}
}
self.err_handler().emit_err(errors::BadCVariadic { span: variadic_spans });
}
fn check_item_named(&self, ident: Ident, kind: &str) {

2
compiler/rustc_ast_passes/src/errors.rs
View file

@ -271,7 +271,7 @@ pub struct ExternItemAscii {
#[diag(ast_passes_bad_c_variadic)]
pub struct BadCVariadic {
#[primary_span]
pub span: Span,
pub span: Vec<Span>,
}
#[derive(Diagnostic)]

10
tests/ui/c-variadic/issue-86053-1.stderr
View file

@ -50,13 +50,7 @@ error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/issue-86053-1.rs:11:12
|
LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) {
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/issue-86053-1.rs:11:36
|
LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) {
| ^^^
| ^^^ ^^^
error[E0412]: cannot find type `F` in this scope
--> $DIR/issue-86053-1.rs:11:48
@ -76,6 +70,6 @@ help: you might be missing a type parameter
LL | fn ordering4 < 'a , 'b, F > ( a : , self , self , self ,
| +++
error: aborting due to 11 previous errors
error: aborting due to 10 previous errors
For more information about this error, try `rustc --explain E0412`.

2
tests/ui/parser/variadic-ffi-semantic-restrictions.rs
View file

@ -49,11 +49,9 @@ fn i_f2(...) {}
//~| ERROR C-variadic function must be declared with at least one named argument
fn i_f3(..., x: isize, ...) {}
//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
//~| ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
//~| ERROR `...` must be the last argument of a C-variadic function
fn i_f4(..., x: isize, ...) {}
//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
//~| ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
//~| ERROR `...` must be the last argument of a C-variadic function
}

42
tests/ui/parser/variadic-ffi-semantic-restrictions.stderr
View file

@ -116,91 +116,79 @@ error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:50:13
|
LL | fn i_f3(..., x: isize, ...) {}
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:50:28
|
LL | fn i_f3(..., x: isize, ...) {}
| ^^^
| ^^^ ^^^
error: `...` must be the last argument of a C-variadic function
--> $DIR/variadic-ffi-semantic-restrictions.rs:54:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:53:13
|
LL | fn i_f4(..., x: isize, ...) {}
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:54:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:53:13
|
LL | fn i_f4(..., x: isize, ...) {}
| ^^^
| ^^^ ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:54:28
|
LL | fn i_f4(..., x: isize, ...) {}
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:61:23
--> $DIR/variadic-ffi-semantic-restrictions.rs:59:23
|
LL | fn t_f1(x: isize, ...) {}
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:63:23
--> $DIR/variadic-ffi-semantic-restrictions.rs:61:23
|
LL | fn t_f2(x: isize, ...);
| ^^^
error: C-variadic function must be declared with at least one named argument
--> $DIR/variadic-ffi-semantic-restrictions.rs:65:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:63:13
|
LL | fn t_f3(...) {}
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:65:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:63:13
|
LL | fn t_f3(...) {}
| ^^^
error: C-variadic function must be declared with at least one named argument
--> $DIR/variadic-ffi-semantic-restrictions.rs:68:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:66:13
|
LL | fn t_f4(...);
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:68:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:66:13
|
LL | fn t_f4(...);
| ^^^
error: `...` must be the last argument of a C-variadic function
--> $DIR/variadic-ffi-semantic-restrictions.rs:71:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:69:13
|
LL | fn t_f5(..., x: isize) {}
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:71:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:69:13
|
LL | fn t_f5(..., x: isize) {}
| ^^^
error: `...` must be the last argument of a C-variadic function
--> $DIR/variadic-ffi-semantic-restrictions.rs:74:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:72:13
|
LL | fn t_f6(..., x: isize);
| ^^^
error: only foreign or `unsafe extern "C"` functions may be C-variadic
--> $DIR/variadic-ffi-semantic-restrictions.rs:74:13
--> $DIR/variadic-ffi-semantic-restrictions.rs:72:13
|
LL | fn t_f6(..., x: isize);
| ^^^
error: aborting due to 34 previous errors
error: aborting due to 32 previous errors