From 6df20efcc33aa4f730f4d6406e11b9fe1efd377e Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 6 Aug 2007 21:00:37 +0000
Subject: [PATCH] Fix PR1577, a crash on invalid bug.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40874 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/AsmParser/llvmAsmParser.y             | 1 +
 test/Assembler/2007-08-06-AliasInvalid.ll | 7 +++++++
 2 files changed, 8 insertions(+)
 create mode 100644 test/Assembler/2007-08-06-AliasInvalid.ll

diff --git a/lib/AsmParser/llvmAsmParser.y b/lib/AsmParser/llvmAsmParser.y
index 9d7b063d0c3..adf6eadc7c7 100644
--- a/lib/AsmParser/llvmAsmParser.y
+++ b/lib/AsmParser/llvmAsmParser.y
@@ -1980,6 +1980,7 @@ ThreadLocal : THREAD_LOCAL { $$ = true; } | { $$ = false; };
 AliaseeRef : ResultTypes SymbolicValueRef {
     const Type* VTy = $1->get();
     Value *V = getVal(VTy, $2);
+    CHECK_FOR_ERROR
     GlobalValue* Aliasee = dyn_cast<GlobalValue>(V);
     if (!Aliasee)
       GEN_ERROR("Aliases can be created only to global values");
diff --git a/test/Assembler/2007-08-06-AliasInvalid.ll b/test/Assembler/2007-08-06-AliasInvalid.ll
new file mode 100644
index 00000000000..0711e037a67
--- /dev/null
+++ b/test/Assembler/2007-08-06-AliasInvalid.ll
@@ -0,0 +1,7 @@
+; RUN: llvm-as < %s > /dev/null |& grep {Invalid type for reference to global}
+; PR1577
+
+@anInt = global i32 1 alias i32 @anAlias
+define i32 @main() {
+   ret i32 0 
+}
-- 
2.34.1