From: Matthias Braun <matze@braunis.de>
Date: Fri, 19 May 2017 22:37:01 +0000 (+0000)
Subject: Verifier: Check wchar_size module flag.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=60ecb7fde81665fe54e2ef278eed9fb25e9d8693;p=llvm

Verifier: Check wchar_size module flag.

Differential Revision: https://reviews.llvm.org/D32974

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303460 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/IR/Verifier.cpp b/lib/IR/Verifier.cpp
index 3b68d636587..4b9bdcf81a3 100644
--- a/lib/IR/Verifier.cpp
+++ b/lib/IR/Verifier.cpp
@@ -1317,6 +1317,15 @@ Verifier::visitModuleFlag(const MDNode *Op,
     Assert(Inserted,
            "module flag identifiers must be unique (or of 'require' type)", ID);
   }
+
+  if (ID->getString() == "wchar_size") {
+    ConstantInt *Value
+      = mdconst::dyn_extract_or_null<ConstantInt>(Op->getOperand(2));
+    Assert(Value, "wchar_size metadata requires constant integer argument");
+    uint64_t WCharSize = Value->getZExtValue();
+    Assert(WCharSize == 0 || WCharSize == 2 || WCharSize == 4,
+           "wchar_size should be 0, 2 or 4");
+  }
 }
 
 /// Return true if this attribute kind only applies to functions.