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Add a test for escaping LLVMisms in inline asm #81812

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Feb 6, 2021
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32 changes: 32 additions & 0 deletions src/test/codegen/asm-sanitize-llvm.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
// FIXME(nagisa): remove the flags here once all targets support `asm!`.
// compile-flags: --target x86_64-unknown-linux-gnu

// Verify we sanitize the special tokens for the LLVM inline-assembly, ensuring people won't
// inadvertently rely on the LLVM-specific syntax and features.
#![no_core]
#![feature(no_core, lang_items, rustc_attrs)]
#![crate_type = "rlib"]

#[rustc_builtin_macro]
macro_rules! asm {
() => {};
}

#[lang = "sized"]
trait Sized {}
#[lang = "copy"]
trait Copy {}

pub unsafe fn we_escape_dollar_signs() {
// CHECK: call void asm sideeffect alignstack inteldialect "banana$$:"
asm!(
r"banana$:",
)
}

pub unsafe fn we_escape_escapes_too() {
// CHECK: call void asm sideeffect alignstack inteldialect "banana\{{(\\|5C)}}36:"
asm!(
r"banana\36:",
)
}