[llvm] r303460 - Verifier: Check wchar_size module flag.

[Matthias Braun via llvm-commits]

Author: matze
Date: Fri May 19 17:37:01 2017
New Revision: 303460

URL: http://llvm.org/viewvc/llvm-project?rev=303460&view=rev
Log:
Verifier: Check wchar_size module flag.

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

Modified:
    llvm/trunk/lib/IR/Verifier.cpp

Modified: llvm/trunk/lib/IR/Verifier.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/Verifier.cpp?rev=303460&r1=303459&r2=303460&view=diff
==============================================================================
--- llvm/trunk/lib/IR/Verifier.cpp (original)
+++ llvm/trunk/lib/IR/Verifier.cpp Fri May 19 17:37:01 2017
@@ -1317,6 +1317,15 @@ Verifier::visitModuleFlag(const MDNode *
     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.