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50 lines
2.2 KiB
Rust
50 lines
2.2 KiB
Rust
// Verifies that `Session::default_visibility` is affected when using the related cmdline
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// flag. This is a regression test for https://github.com/rust-lang/compiler-team/issues/782. See
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// also https://github.com/rust-lang/rust/issues/73295 and
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// https://github.com/rust-lang/rust/issues/37530.
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//@ revisions:DEFAULT HIDDEN PROTECTED INTERPOSABLE
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//@[HIDDEN] compile-flags: -Zdefault-visibility=hidden
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//@[PROTECTED] compile-flags: -Zdefault-visibility=protected
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//@[INTERPOSABLE] compile-flags: -Zdefault-visibility=interposable
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// The test scenario is specifically about visibility of symbols exported out of dynamically linked
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// libraries.
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#![crate_type = "dylib"]
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// The test scenario needs to use a Rust-public, but non-explicitly-exported symbol
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// (e.g. the test doesn't use `#[no_mangle]`, because currently it implies that
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// the symbol should be exported; we don't want that - we want to test the *default*
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// export setting instead).
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#[used]
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pub static tested_symbol: [u8; 6] = *b"foobar";
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// Exact LLVM IR differs depending on the target triple (e.g. `hidden constant`
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// vs `internal constant` vs `constant`). Because of this, we only apply the
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// specific test expectations below to one specific target triple. If needed,
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// additional targets can be covered by adding copies of this test file with
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// a different `only-X` directive.
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//
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//@ only-x86_64-unknown-linux-gnu
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// HIDDEN: @{{.*}}default_visibility{{.*}}tested_symbol{{.*}} = hidden constant
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// PROTECTED: @{{.*}}default_visibility{{.*}}tested_symbol{{.*}} = protected constant
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// INTERPOSABLE: @{{.*}}default_visibility{{.*}}tested_symbol{{.*}} = constant
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// DEFAULT: @{{.*}}default_visibility{{.*}}tested_symbol{{.*}} = constant
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pub fn do_memcmp(left: &[u8], right: &[u8]) -> i32 {
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left.cmp(right) as i32
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}
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// CHECK: define {{.*}} @{{.*}}do_memcmp{{.*}} {
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// CHECK: }
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// `do_memcmp` should invoke core::intrinsic::compare_bytes which emits a call
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// to the C symbol `memcmp` (at least on x86_64-unknown-linux-gnu). This symbol
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// should *not* be declared hidden or protected.
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// HIDDEN: declare i32 @memcmp
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// PROTECTED: declare i32 @memcmp
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// INTERPOSABLE: declare i32 @memcmp
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// DEFAULT: declare i32 @memcmp
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