rust/tests/codegen/panic-abort-windows.rs

// This test is for *-windows only.
// only-windows

// compile-flags: -C no-prepopulate-passes -C panic=abort -O

#![crate_type = "lib"]

// CHECK: Function Attrs: nounwind uwtable
// CHECK-NEXT: define void @normal_uwtable()
#[no_mangle]
pub fn normal_uwtable() {
}

// CHECK: Function Attrs: nounwind uwtable
// CHECK-NEXT: define void @extern_uwtable()
#[no_mangle]
pub extern fn extern_uwtable() {
}
Ignore `gnu` systems (`windows-msvc` only) 2022-12-01 13:12:55 +00:00			`// This test is for *-windows only.`
Run Windows-only tests only on Windows This removes the need to maintain a list of all other OSs which ignore the tests. 2022-11-28 07:11:19 +00:00			`// only-windows`
rustc: Always emit the `uwtable` attribute on Windows This commit alters the translation layer to unconditionally emit the `uwtable` LLVM attribute on Windows regardless of the `no_landing_pads` setting. Previously I believe we omitted this attribute as an optimization when the `-Cpanic=abort` flag was passed, but this unfortunately caused problems for Gecko. It [was discovered] that there was trouble unwinding through Rust functions due to foreign exceptions such as illegal instructions or otherwise in-practice methods used to abort a process. In testing it looked like the major difference between a working binary and a non-working binary is indeed this `uwtable` attribute, but this PR has unfortunately not been thoroughly tested in terms of compiling Gecko with `-C panic=abort` and this PR to see whether it works, so this is still somewhat working on just suspicion. [was discovered]: https://bugzilla.mozilla.org/show_bug.cgi?id=1302078 2017-03-15 15:09:59 +00:00
			`// compile-flags: -C no-prepopulate-passes -C panic=abort -O`

			`#![crate_type = "lib"]`

rustc: Add LLVM `nounwind` with `-C panic=abort` This informs LLVM that functions can't unwind, which while it should typically have already been inferred when necessary or otherwise not impact codegen is apparently needed on targets like ARM to avoid references to unnecessary symbols. Closes #44992 2017-10-04 21:54:28 +00:00			`// CHECK: Function Attrs: nounwind uwtable`
rustc: Always emit the `uwtable` attribute on Windows This commit alters the translation layer to unconditionally emit the `uwtable` LLVM attribute on Windows regardless of the `no_landing_pads` setting. Previously I believe we omitted this attribute as an optimization when the `-Cpanic=abort` flag was passed, but this unfortunately caused problems for Gecko. It [was discovered] that there was trouble unwinding through Rust functions due to foreign exceptions such as illegal instructions or otherwise in-practice methods used to abort a process. In testing it looked like the major difference between a working binary and a non-working binary is indeed this `uwtable` attribute, but this PR has unfortunately not been thoroughly tested in terms of compiling Gecko with `-C panic=abort` and this PR to see whether it works, so this is still somewhat working on just suspicion. [was discovered]: https://bugzilla.mozilla.org/show_bug.cgi?id=1302078 2017-03-15 15:09:59 +00:00			`// CHECK-NEXT: define void @normal_uwtable()`
			`#[no_mangle]`
			`pub fn normal_uwtable() {`
			`}`

			`// CHECK: Function Attrs: nounwind uwtable`
			`// CHECK-NEXT: define void @extern_uwtable()`
			`#[no_mangle]`
			`pub extern fn extern_uwtable() {`
			`}`