From 90e5a8ac475fa3c2fa7c22a341e798d6f7356b54 Mon Sep 17 00:00:00 2001
From: Mitch Phillips <31459023+hctim@users.noreply.github.com>
Date: Wed, 13 Jul 2022 08:39:26 -0700
Subject: Remove 'no_sanitize_memtag'. Add 'sanitize_memtag'.

For MTE globals, we should have clang emit the attribute for all GV's
that it creates, and then use that in the upcoming AArch64 global
tagging IR pass. We need a positive attribute for this sanitizer (rather
than implicit sanitization of all globals) because it needs to interact
with other parts of LLVM, including:

  1. Suppressing certain global optimisations (like merging),
  2. Emitting extra directives by the ASM writer, and
  3. Putting extra information in the symbol table entries.

While this does technically make the LLVM IR / bitcode format
non-backwards-compatible, nobody should have used this attribute yet,
because it's a no-op.

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D128950
---
 llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'llvm/lib/Bitcode/Reader/BitcodeReader.cpp')

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 3af2bfa..8d5a255 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -3678,7 +3678,7 @@ GlobalValue::SanitizerMetadata deserializeSanitizerMetadata(unsigned V) {
   if (V & (1 << 1))
     Meta.NoHWAddress = true;
   if (V & (1 << 2))
-    Meta.NoMemtag = true;
+    Meta.Memtag = true;
   if (V & (1 << 3))
     Meta.IsDynInit = true;
   return Meta;
-- 
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