[PATCH] D90073: [Clang][CodeGen] fix failed assertion

[Nick Desaulniers via Phabricator via cfe-commits]

nickdesaulniers created this revision.
nickdesaulniers added reviewers: aaron.ballman, iajbar.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
nickdesaulniers requested review of this revision.

Via bugreport:
https://reviews.llvm.org/D66492#2350947


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D90073

Files:
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/test/CodeGen/alias.c


Index: clang/test/CodeGen/alias.c
===================================================================
--- clang/test/CodeGen/alias.c
+++ clang/test/CodeGen/alias.c
@@ -109,3 +109,9 @@
 // CHECKGLOBALS: @test12_alias = alias void (), void ()* @test12
 void test12(void) {}
 inline void test12_alias(void) __attribute__((gnu_inline, alias("test12")));
+
+// Test that a non visible (-Wvisibility) type doesn't assert.
+// CHECKGLOBALS: @test13_alias = alias {}, bitcast (void (i32)* @test13 to {}*)
+enum a_type { test13_a };
+void test13(enum a_type y) {}
+void test13_alias(enum undeclared_type y) __attribute__((alias ("test13")));
Index: clang/lib/CodeGen/CodeGenModule.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenModule.cpp
+++ clang/lib/CodeGen/CodeGenModule.cpp
@@ -4637,8 +4637,13 @@
     Aliasee = GetOrCreateLLVMGlobal(AA->getAliasee(),
                                     llvm::PointerType::getUnqual(DeclTy),
                                     /*D=*/nullptr);
-    LT = getLLVMLinkageVarDefinition(cast<VarDecl>(GD.getDecl()),
-                                     D->getType().isConstQualified());
+    if (isa<VarDecl>(GD.getDecl()))
+      LT = getLLVMLinkageVarDefinition(cast<VarDecl>(GD.getDecl()),
+                                       D->getType().isConstQualified());
+    else if (isa<FunctionDecl>(GD.getDecl()))
+      LT = getFunctionLinkage(GD);
+    assert((isa<VarDecl>(GD.getDecl()) || isa<FunctionDecl>(GD.getDecl())) &&
+           "unexpected DeclType");
   }
 
   // Create the new alias itself, but don't set a name yet.


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