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bjorn3
9b7623a162
This was necessary when transitioning from JS to wasm exception handling on Emscripten. Enough time has probably passed that we no longer need to support JS exception handling on Emscripten. This enables cleaning up a fair bit of code.
97 lines
2.4 KiB
Rust
97 lines
2.4 KiB
Rust
//@ only-wasm32
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//@ revisions: WASM WASMEXN
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//@ [WASMEXN] compile-flags: -C panic=unwind
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#![crate_type = "lib"]
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#![feature(core_intrinsics, link_llvm_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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// WASM-LABEL: @test_cleanup() {{.*}}
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// WASMEXN-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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// WASMEXN-NOT: call
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// WASMEXN: invoke void @may_panic()
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// WASMEXN: %cleanuppad = cleanuppad within none []
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//
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// WASM: call void @may_panic()
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// WASM-NOT: invoke void @may_panic()
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}
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// WASM-LABEL: @test_rtry() {{.*}}
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// WASMEXN-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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may_panic();
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},
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core::ptr::null_mut::<u8>(),
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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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// WASMEXN-NOT: call
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// WASMEXN: invoke void @may_panic()
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// WASMEXN: {{.*}} = catchswitch within none [label {{.*}}] unwind to caller
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// WASMEXN: {{.*}} = catchpad within {{.*}} [ptr null]
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// WASMEXN: catchret
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// WASM: call void @may_panic()
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// WASM-NOT: invoke void @may_panic()
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// WASM-NOT: catchswitch
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// WASM-NOT: catchpad
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// WASM-NOT: 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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//
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// Note that this test uses the raw `wasm_throw` intrinsic because the one from
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// libstd was built with `-Cpanic=abort` and it's technically not valid to use
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// when this crate is compiled with `-Cpanic=unwind`.
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//
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// WASMEXN-LABEL: @test_intrinsic() {{.*}} @__gxx_wasm_personality_v0
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#[no_mangle]
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#[cfg(wasmexn)]
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pub fn test_intrinsic() {
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let _log_on_drop = LogOnDrop;
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unsafe extern "C-unwind" {
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#[link_name = "llvm.wasm.throw"]
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fn wasm_throw(tag: i32, ptr: *mut u8) -> !;
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}
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unsafe {
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wasm_throw(0, core::ptr::null_mut());
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}
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// WASMEXN-NOT: call
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// WASMEXN: invoke void @llvm.wasm.throw(i32 noundef 0, ptr noundef null)
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// WASMEXN: %cleanuppad = cleanuppad within none []
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}
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