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70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
//@ compile-flags: -Copt-level=3 --target wasm32-unknown-emscripten -Z emscripten-wasm-eh
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//@ needs-llvm-components: webassembly
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// Emscripten catch_unwind using wasm exceptions
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#![feature(no_core, lang_items, intrinsics, rustc_attrs)]
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#![crate_type = "lib"]
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#![no_std]
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#![no_core]
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#[lang = "pointee_sized"]
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pub trait PointeeSized {}
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#[lang = "meta_sized"]
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pub trait MetaSized: PointeeSized {}
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#[lang = "sized"]
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pub trait Sized: MetaSized {}
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#[lang = "freeze"]
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trait Freeze {}
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#[lang = "copy"]
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trait Copy {}
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impl<T> Copy for *mut T {}
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#[rustc_intrinsic]
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fn size_of<T>() -> usize {
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loop {}
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}
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#[rustc_intrinsic]
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unsafe fn catch_unwind(
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try_fn: fn(_: *mut u8),
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data: *mut u8,
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catch_fn: fn(_: *mut u8, _: *mut u8),
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) -> i32;
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// CHECK-LABEL: @ptr_size
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#[no_mangle]
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pub fn ptr_size() -> usize {
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// CHECK: ret [[PTR_SIZE:.*]]
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size_of::<*mut u8>()
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}
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// CHECK-LABEL: @test_catch_unwind
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#[no_mangle]
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pub unsafe fn test_catch_unwind(
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try_fn: fn(_: *mut u8),
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data: *mut u8,
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catch_fn: fn(_: *mut u8, _: *mut u8),
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) -> i32 {
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// CHECK: start:
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// CHECK: invoke void %try_fn(ptr %data)
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// CHECK: to label %__rust_try.exit unwind label %catchswitch.i
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// CHECK: catchswitch.i: ; preds = %start
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// CHECK: %catchswitch1.i = catchswitch within none [label %catchpad.i] unwind to caller
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// CHECK: catchpad.i: ; preds = %catchswitch.i
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// CHECK: %catchpad2.i = catchpad within %catchswitch1.i [ptr null]
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// CHECK: %0 = tail call ptr @llvm.wasm.get.exception(token %catchpad2.i)
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// CHECK: %1 = tail call i32 @llvm.wasm.get.ehselector(token %catchpad2.i)
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// CHECK: call void %catch_fn(ptr %data, ptr %0) [ "funclet"(token %catchpad2.i) ]
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// CHECK: catchret from %catchpad2.i to label %__rust_try.exit
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// CHECK: __rust_try.exit: ; preds = %start, %catchpad.i
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// CHECK: %common.ret.op.i = phi i32 [ 0, %start ], [ 1, %catchpad.i ]
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// CHECK: ret i32 %common.ret.op.i
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catch_unwind(try_fn, data, catch_fn)
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}
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