From: Jim Grosbach <grosbach@apple.com>
Date: Tue, 17 Apr 2012 21:23:52 +0000 (+0000)
Subject: Sanity check error handling for TokenAlias.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=67cd20d0396a68e61858736b7943dd352f1b0d0b;p=oota-llvm.git

Sanity check error handling for TokenAlias.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154951 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index 503d0730bbf..dc92a6c218e 100644
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -1329,6 +1329,9 @@ void AsmMatcherInfo::BuildInfo() {
     Record *Rec = AllTokenAliases[i];
     ClassInfo *FromClass = getTokenClass(Rec->getValueAsString("FromToken"));
     ClassInfo *ToClass = getTokenClass(Rec->getValueAsString("ToToken"));
+    if (FromClass == ToClass)
+      throw TGError(Rec->getLoc(),
+                    "error: Destination value identical to source value.");
     FromClass->SuperClasses.push_back(ToClass);
   }