Allow disabling ASan instrumentation for globals

AddressSanitizer adds instrumentation to global variables unless the
[`no_sanitize_address`](https://llvm.org/docs/LangRef.html#global-attributes)
attribute is set on them.

This commit extends the existing `#[no_sanitize(address)]` attribute to
set this; previously it only had the desired effect on functions.

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_llvm/src/base.rs b/compiler/rustc_codegen_llvm/src/base.rs
index 32793894794..f62310bd948 100644
--- a/compiler/rustc_codegen_llvm/src/base.rs
+++ b/compiler/rustc_codegen_llvm/src/base.rs
@@ -172,3 +172,12 @@ pub(crate) fn visibility_to_llvm(linkage: Visibility) -> llvm::Visibility {
         Visibility::Protected => llvm::Visibility::Protected,
     }
 }
+
+pub(crate) fn set_variable_sanitizer_attrs(llval: &Value, attrs: &CodegenFnAttrs) {
+    if attrs.no_sanitize.contains(SanitizerSet::ADDRESS) {
+        unsafe { llvm::LLVMRustSetNoSanitizeAddress(llval) };
+    }
+    if attrs.no_sanitize.contains(SanitizerSet::HWADDRESS) {
+        unsafe { llvm::LLVMRustSetNoSanitizeHWAddress(llval) };
+    }
+}