Folkert de Vries (Jan 07 2024 at 17:29): Folkert de Vries (Jan 07 2024 at 17:29):turns out setjmp/longjmp is broken on windows. I've added some info to an existing issue https://github.com/llvm/llvm-project/issues/72908#issuecomment-1880119269 but I'd say it's unlikely to be resolved given the amount of activity on that issue ...
@Brendan Hansknecht how are your LLVM skills at this point? could we figure this out ourselves?
Folkert de Vries (Jan 07 2024 at 17:30):and cc @Luke Boswell who helped at least find this bug on our side. but I don't think we can fix it on our side
Folkert de Vries (Jan 07 2024 at 17:30):except by using our own inline assembly of course
Brendan Hansknecht (Jan 07 2024 at 17:51):As much as I work with llvm and mlir, I almost never touch the actual llvm codebase.
Richard Feldman (Jan 07 2024 at 17:55):Folkert de Vries said:
I don't think we can fix it on our side
is it possible we could emit assembly or machine instructions there directly somehow?
Folkert de Vries (Jan 07 2024 at 17:56):yeah we could have zig provide those
Folkert de Vries (Jan 07 2024 at 17:56):we already need a workaround on aarch64 because llvm just does not generate anything for the setjmp/longjmp intrinsics
Folkert de Vries (Jan 07 2024 at 17:56):though that might be fixed now? the issue that ayaz made is still open though
Folkert de Vries (Jan 07 2024 at 21:13):ugh zig inline assembly does not support intel syntax... apparently for good reasons (in 2016) but cmon
Richard Feldman (Jan 07 2024 at 21:15):chatgpt might be able to translate
Folkert de Vries (Jan 07 2024 at 21:23):well yes but my eyes!
Folkert de Vries (Jan 07 2024 at 22:05):@Luke Boswell can you try this one locally when you get a chance https://github.com/roc-lang/roc/pull/6363
Luke Boswell (Jan 07 2024 at 22:30): FAIL [ 0.915s] test_gen::test_gen gen_panic::crash_in_passed_closure
--- STDOUT: test_gen::test_gen gen_panic::crash_in_passed_closure ---
running 1 test
test gen_panic::crash_in_passed_closure - should panic ... FAILED
failures:
---- gen_panic::crash_in_passed_closure stdout ----
note: panic did not contain expected string
panic message: `"Unrecognized builtin function: \"windows_longjmp\" - if you're working on the Roc compiler, do you need to rebuild the bitcode? See compiler/builtins/bitcode/README.md"`,
expected substring: `"User crash with message: \"no new even primes\""`
failures:
gen_panic::crash_in_passed_closure
test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 1328 filtered out; finished in 0.89s
--- STDERR: test_gen::test_gen gen_panic::crash_in_passed_closure ---
thread 'gen_panic::crash_in_passed_closure' panicked at 'Unrecognized builtin function: "windows_longjmp" - if you're working on the Roc compiler, do you need to rebuild the bitcode? See compiler/builtins/bitcode/README.md', crates\compiler\gen_llvm\src\llvm\bitcode.rs:104:28
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Canceling due to test failure
------------
Summary [ 0.918s] 1 test run: 0 passed, 1 failed, 1328 skipped
FAIL [ 0.915s] test_gen::test_gen gen_panic::crash_in_passed_closure
hmm you may need a construction like this
// Zig won't expose the externs (and hence link correctly) unless we force them to be used.
fn __roc_force_setjmp(it: [*c]c_int) callconv(.C) c_int {
return setjmp(it);
}
fn __roc_force_longjmp(a0: [*c]c_int, a1: c_int) callconv(.C) noreturn {
longjmp(a0, a1);
}
to force an export?
Luke Boswell (Jan 07 2024 at 23:58):What is the syntax of that global assembly in zig?
\\.global windows_longjmp;
\\.type windows_longjmp, @function; # <<--- do we need something like this??? I added this and its wrong
\\windows_longjmp:
\\ movq 0x00(%rcx), %rdx
\\ movq 0x08(%rcx), %rbx
Looking at zig docs I wonder if we need to specify the symbol is a function?
Luke Boswell (Jan 08 2024 at 01:22):Fixed :tada:
PS C:\Users\bosyl\Documents\GitHub\ROC> cargo nextest-gen-llvm gen_panic
Compiling test_gen v0.0.1 (C:\Users\bosyl\Documents\GitHub\ROC\crates\compiler\test_gen)
Finished test [unoptimized + debuginfo] target(s) in 8.44s
Starting 4 tests across 1 binary (1325 skipped)
PASS [ 3.105s] test_gen::test_gen gen_panic::crash_in_passed_closure
PASS [ 4.193s] test_gen::test_gen gen_panic::crash_variable
PASS [ 4.380s] test_gen::test_gen gen_panic::crash_literal
PASS [ 4.422s] test_gen::test_gen gen_panic::crash_in_call
------------
Summary [ 4.424s] 4 tests run: 4 passed, 1325 skipped
woooooo!!!! :tada: :tada: :tada:
Last updated: Jul 26 2025 at 12:14 UTC