From 64d98f8ee037282c35007b64c2649055c56af1db Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:03 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- .../c-unwind-abi-catch-lib-panic/main.rs | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 tests/run-make-fulldeps/c-unwind-abi-catch-lib-panic/main.rs (limited to 'tests/run-make-fulldeps/c-unwind-abi-catch-lib-panic/main.rs') diff --git a/tests/run-make-fulldeps/c-unwind-abi-catch-lib-panic/main.rs b/tests/run-make-fulldeps/c-unwind-abi-catch-lib-panic/main.rs new file mode 100644 index 000000000..78a71219c --- /dev/null +++ b/tests/run-make-fulldeps/c-unwind-abi-catch-lib-panic/main.rs @@ -0,0 +1,35 @@ +//! A test for calling `C-unwind` functions across foreign function boundaries. +//! +//! This test triggers a panic in a Rust library that our foreign function invokes. This shows +//! that we can unwind through the C code in that library, and catch the underlying panic. +#![feature(c_unwind)] + +use std::panic::{catch_unwind, AssertUnwindSafe}; + +fn main() { + // Call `add_small_numbers`, passing arguments that will NOT trigger a panic. + let (a, b) = (9, 1); + let c = unsafe { add_small_numbers(a, b) }; + assert_eq!(c, 10); + + // Call `add_small_numbers`, passing arguments that will trigger a panic, and catch it. + let caught_unwind = catch_unwind(AssertUnwindSafe(|| { + let (a, b) = (10, 1); + let _c = unsafe { add_small_numbers(a, b) }; + unreachable!("should have unwound instead of returned"); + })); + + // Assert that we did indeed panic, then unwrap and downcast the panic into the sum. + assert!(caught_unwind.is_err()); + let panic_obj = caught_unwind.unwrap_err(); + let msg = panic_obj.downcast_ref::().unwrap(); + assert_eq!(msg, "11"); +} + +#[link(name = "add", kind = "static")] +extern "C-unwind" { + /// An external function, defined in C. + /// + /// Returns the sum of two numbers, or panics if the sum is greater than 10. + fn add_small_numbers(a: u32, b: u32) -> u32; +} -- cgit v1.2.3