From 993502eafd8f108d266c21726b2f628fe50628e6 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Mon, 23 Feb 2015 21:51:06 +0000
Subject: [PATCH] Fix invalid cast.

Fixes PR22525.

Patch by Ben Longbons with testcase by me.

llvm-svn: 230271
---
 llvm/lib/IR/Core.cpp                |  2 +-
 llvm/unittests/IR/ConstantsTest.cpp | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/IR/Core.cpp b/llvm/lib/IR/Core.cpp
index 6303e45..f007616 100644
--- a/llvm/lib/IR/Core.cpp
+++ b/llvm/lib/IR/Core.cpp
@@ -1630,7 +1630,7 @@ LLVMValueRef LLVMAddAlias(LLVMModuleRef M, LLVMTypeRef Ty, LLVMValueRef Aliasee,
   auto *PTy = cast<PointerType>(unwrap(Ty));
   return wrap(GlobalAlias::create(PTy->getElementType(), PTy->getAddressSpace(),
                                   GlobalValue::ExternalLinkage, Name,
-                                  unwrap<GlobalObject>(Aliasee), unwrap(M)));
+                                  unwrap<Constant>(Aliasee), unwrap(M)));
 }
 
 /*--.. Operations on functions .............................................--*/
diff --git a/llvm/unittests/IR/ConstantsTest.cpp b/llvm/unittests/IR/ConstantsTest.cpp
index 5414b25..5d271e2 100644
--- a/llvm/unittests/IR/ConstantsTest.cpp
+++ b/llvm/unittests/IR/ConstantsTest.cpp
@@ -7,12 +7,14 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/AsmParser/Parser.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/InstrTypes.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Support/SourceMgr.h"
 #include "gtest/gtest.h"
 
 namespace llvm {
@@ -347,5 +349,19 @@ TEST(ConstantsTest, GEPReplaceWithConstant) {
   ASSERT_EQ(GEP->getOperand(0), Alias);
 }
 
+TEST(ConstantsTest, AliasCAPI) {
+  LLVMContext Context;
+  SMDiagnostic Error;
+  std::unique_ptr<Module> M =
+      parseAssemblyString("@g = global i32 42", Error, Context);
+  GlobalVariable *G = M->getGlobalVariable("g");
+  Type *I16Ty = Type::getInt16Ty(Context);
+  Type *I16PTy = PointerType::get(I16Ty, 0);
+  Constant *Aliasee = ConstantExpr::getBitCast(G, I16PTy);
+  LLVMValueRef AliasRef =
+      LLVMAddAlias(wrap(M.get()), wrap(I16PTy), wrap(Aliasee), "a");
+  ASSERT_EQ(unwrap<GlobalAlias>(AliasRef)->getAliasee(), Aliasee);
+}
+
 }  // end anonymous namespace
 }  // end namespace llvm
-- 
2.7.4