60 lines
1.7 KiB
Rust
60 lines
1.7 KiB
Rust
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//@ compile-flags: -O --target wasm32-unknown-emscripten
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//@ needs-llvm-components: webassembly
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// Emscripten has its own unique implementation of catch_unwind (in `codegen_emcc_try`),
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// make sure it generates something reasonable.
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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="sized"] trait Sized { }
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#[lang="freeze"] trait Freeze { }
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#[lang="copy"] trait Copy { }
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#[rustc_intrinsic]
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fn size_of<T>() -> usize { loop {} }
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extern "rust-intrinsic" {
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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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}
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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: [[ALLOCA:%.*]] = alloca
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// CHECK: catch.i:
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// CHECK: [[LANDINGPAD:%.*]] = landingpad
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// CHECK: [[EXCEPTION:%.*]] = extractvalue {{.*}} [[LANDINGPAD]], 0
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// CHECK: [[SELECTOR:%.*]] = extractvalue {{.*}} [[LANDINGPAD]], 1
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// CHECK: [[IS_RUST_EXN:%.*]] = icmp eq {{.*}}[[SELECTOR]]
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// CHECK: [[IS_RUST_EXN_I8:%.*]] = zext i1 [[IS_RUST_EXN]] to i8
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// CHECK: store ptr [[EXCEPTION]], ptr [[ALLOCA]]
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// CHECK: [[IS_RUST_SLOT:%.*]] = getelementptr inbounds i8, ptr [[ALLOCA]], [[PTR_SIZE]]
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// CHECK: store i8 [[IS_RUST_EXN_I8]], ptr [[IS_RUST_SLOT]]
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// CHECK: call void %catch_fn(ptr %data, ptr nonnull [[ALLOCA]])
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catch_unwind(try_fn, data, catch_fn)
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}
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