Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Add some comments regarding __c_longjmp. NFC #21442

Merged
merged 2 commits into from
Feb 27, 2024
Merged

Add some comments regarding __c_longjmp. NFC #21442

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
8b9002d
Add some comments regarding __c_longjmp. NFC
sbc100 Feb 27, 2024
422d7d4
Update system/lib/compiler-rt/emscripten_setjmp.c
sbc100 Feb 27, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 5 additions & 1 deletion system/lib/compiler-rt/emscripten_setjmp.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -81,13 +81,17 @@ struct __WasmLongjmpArgs {

thread_local struct __WasmLongjmpArgs __wasm_longjmp_args;

// llvm uses `1` for the __c_longjmp tag.
// See https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/CodeGen/WasmEHFuncInfo.h
#define C_LONGJMP 1

// Wasm EH allows us to throw and catch multiple values, but that requires
// multivalue support in the toolchain, whch is not reliable at the time.
// TODO Consider switching to throwing two values at the same time later.
void __wasm_longjmp(void *env, int val) {
__wasm_longjmp_args.env = env;
__wasm_longjmp_args.val = val;
__builtin_wasm_throw(1, &__wasm_longjmp_args);
__builtin_wasm_throw(C_LONGJMP, &__wasm_longjmp_args);
}

#endif
Loading