rust/tests/codegen/nounwind.rs

// aux-build:nounwind.rs
// compile-flags: -C no-prepopulate-passes -C panic=abort -C metadata=a
// ignore-windows
// ignore-android

#![crate_type = "lib"]

extern crate nounwind;

#[no_mangle]
pub fn foo() {
    nounwind::bar();
// CHECK: @foo() unnamed_addr #0
// CHECK: @bar() unnamed_addr #0
// CHECK: attributes #0 = { {{.*}}nounwind{{.*}} }
}
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			`// aux-build:nounwind.rs`
			`// compile-flags: -C no-prepopulate-passes -C panic=abort -C metadata=a`
			`// ignore-windows`
rustc: Always emit `uwtable` on Android Long ago (#40549) we enabled the `uwtable` attribute on Windows by default (even with `-C panic=abort`) to allow unwinding binaries for [stack unwinding information][winstack]. It looks like this same issue is [plaguing][arm1] Gecko's Android platforms [as well][arm2]. This commit applies the same fix as #40549 except that this time it's applied for all Android targets. Generating a `-C panic=abort` binary for `armv7-linux-androideabi` before this commit generated a number of `cantunwind` functions (detected with `readelf -u`) but after this commit they all list appropriate unwind information. Closes #49867 [winstack]: https://bugzilla.mozilla.org/show_bug.cgi?id=1302078 [arm1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1453220 [arm2]: https://bugzilla.mozilla.org/show_bug.cgi?id=1451741 2018-04-19 22:17:34 +00:00			`// ignore-android`
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
			`#![crate_type = "lib"]`

			`extern crate nounwind;`

			`#[no_mangle]`
			`pub fn foo() {`
			`nounwind::bar();`
			`// CHECK: @foo() unnamed_addr #0`
			`// CHECK: @bar() unnamed_addr #0`
			`// CHECK: attributes #0 = { {{.}}nounwind{{.}} }`
			`}`