From 243755a13e78ebe7a3bb5ba797dd3e2fd04dd2dd Mon Sep 17 00:00:00 2001
From: Simonas Kazlauskas <git@kazlauskas.me>
Date: Sat, 6 Feb 2021 02:26:35 +0200
Subject: [PATCH] Add a test for escaping LLVMisms in inline asm

We escape certain LLVM-specific features when passing the inline
assembly string to the LLVM. Until now, however, there was no test
making sure this behaviour stays intact. This commit adds such a test!
---
 src/test/codegen/asm-sanitize-llvm.rs | 32 +++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/test/codegen/asm-sanitize-llvm.rs

diff --git a/src/test/codegen/asm-sanitize-llvm.rs b/src/test/codegen/asm-sanitize-llvm.rs
new file mode 100644
index 0000000000000..fe09caa697309
--- /dev/null
+++ b/src/test/codegen/asm-sanitize-llvm.rs
@@ -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:",
+    )
+}