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ed11a39643
Certain LLVM intrinsics, such as `llvm.wasm.throw`, can unwind. Marking them as nounwind causes us to skip cleanup of locals and optimize out `catch_unwind` under inlining or when `llvm.wasm.throw` is used directly by user code. The motivation for forcibly marking llvm.* as nounwind is no longer present: most intrinsics are linked as `extern "C"` or other non-unwinding ABIs, so we won't codegen `invoke` for them anyway.
74 lines
1.7 KiB
Rust
74 lines
1.7 KiB
Rust
//@ only-wasm32
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//@ compile-flags: -C panic=unwind -Z emscripten-wasm-eh
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#![crate_type = "lib"]
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#![feature(core_intrinsics, wasm_exception_handling_intrinsics)]
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extern "C-unwind" {
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fn may_panic();
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}
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extern "C" {
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fn log_number(number: usize);
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}
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struct LogOnDrop;
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impl Drop for LogOnDrop {
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fn drop(&mut self) {
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unsafe {
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log_number(0);
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}
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}
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}
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// CHECK-LABEL: @test_cleanup() {{.*}} @__gxx_wasm_personality_v0
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#[no_mangle]
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pub fn test_cleanup() {
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let _log_on_drop = LogOnDrop;
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unsafe {
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may_panic();
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}
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// CHECK-NOT: call
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// CHECK: invoke void @may_panic()
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// CHECK: %cleanuppad = cleanuppad within none []
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}
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// CHECK-LABEL: @test_rtry() {{.*}} @__gxx_wasm_personality_v0
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#[no_mangle]
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pub fn test_rtry() {
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unsafe {
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core::intrinsics::catch_unwind(
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|_| {
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may_panic();
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},
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core::ptr::null_mut(),
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|data, exception| {
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log_number(data as usize);
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log_number(exception as usize);
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},
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);
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}
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// CHECK-NOT: call
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// CHECK: invoke void @may_panic()
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// CHECK: {{.*}} = catchswitch within none [label {{.*}}] unwind to caller
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// CHECK: {{.*}} = catchpad within {{.*}} [ptr null]
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// CHECK: catchret
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}
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// Make sure the intrinsic is not inferred as nounwind. This is a regression test for #132416.
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// CHECK-LABEL: @test_intrinsic() {{.*}} @__gxx_wasm_personality_v0
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#[no_mangle]
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pub fn test_intrinsic() {
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let _log_on_drop = LogOnDrop;
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unsafe {
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core::arch::wasm32::throw::<0>(core::ptr::null_mut());
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}
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// CHECK-NOT: call
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// CHECK: invoke void @llvm.wasm.throw(i32 noundef 0, ptr noundef null)
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// CHECK: %cleanuppad = cleanuppad within none []
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}
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