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https://github.com/rust-lang/rust
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51 lines
1.3 KiB
Rust
51 lines
1.3 KiB
Rust
// Codegen test for #126242
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//@ compile-flags: -O
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#![crate_type = "lib"]
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#![feature(error_generic_member_access)]
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use std::error::Request;
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use std::fmt;
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#[derive(Debug)]
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struct MyBacktrace1 {}
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#[derive(Debug)]
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struct MyBacktrace2 {}
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#[derive(Debug)]
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struct MyBacktrace3 {}
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#[derive(Debug)]
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struct MyError {
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backtrace1: MyBacktrace1,
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backtrace2: MyBacktrace2,
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backtrace3: MyBacktrace3,
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other: MyBacktrace3,
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}
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impl fmt::Display for MyError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "Example Error")
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}
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}
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impl std::error::Error for MyError {
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// CHECK-LABEL: @provide
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#[no_mangle]
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fn provide<'a>(&'a self, request: &mut Request<'a>) {
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// LLVM should be able to optimize multiple .provide_* calls into a switch table
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// and eliminate redundant ones, rather than compare one-by-one.
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// CHECK-NEXT: start:
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// CHECK-NEXT: %[[SCRUTINEE:[^ ]+]] = load i64, ptr
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// CHECK-NEXT: switch i64 %[[SCRUTINEE]], label %{{.*}} [
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// CHECK-COUNT-3: i64 {{.*}}, label %{{.*}}
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// CHECK-NEXT: ]
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request
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.provide_ref::<MyBacktrace1>(&self.backtrace1)
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.provide_ref::<MyBacktrace3>(&self.other)
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.provide_ref::<MyBacktrace2>(&self.backtrace2)
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.provide_ref::<MyBacktrace3>(&self.backtrace3);
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}
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}
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