[clang] 43e798e - [BPF] Handle aliases in CodeGenModule::EmitExternalDeclaration. Fixes #192365 (#192374)

[via cfe-commits]

Author: Alexander Kornienko
Date: 2026-04-18T01:50:39Z
New Revision: 43e798e4d831b5133e3cf6d30c6315e3e4a71078

URL: https://github.com/llvm/llvm-project/commit/43e798e4d831b5133e3cf6d30c6315e3e4a71078
DIFF: https://github.com/llvm/llvm-project/commit/43e798e4d831b5133e3cf6d30c6315e3e4a71078.diff

LOG: [BPF] Handle aliases in CodeGenModule::EmitExternalDeclaration. Fixes #192365 (#192374)

Adds handling of global aliases in
CodeGenModule::EmitExternalDeclaration. This fixes a clang crash on some
real code, see llvm#192365.

Added: 
    clang/test/CodeGenCXX/bpf-debug-info-alias.cpp

Modified: 
    clang/lib/CodeGen/CodeGenModule.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 79c98f82a766f..c635a6c175b25 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -5989,6 +5989,10 @@ void CodeGenModule::EmitExternalDeclaration(const DeclaratorDecl *D) {
     return;
 
   llvm::Constant *Addr = GetAddrOfGlobal(GD)->stripPointerCasts();
+  if (auto *GA = dyn_cast<llvm::GlobalAlias>(Addr)) {
+    DI->EmitGlobalAlias(GA, GD);
+    return;
+  }
   if (const auto *VD = dyn_cast<VarDecl>(D)) {
     DI->EmitExternalVariable(
         cast<llvm::GlobalVariable>(Addr->stripPointerCasts()), VD);

diff  --git a/clang/test/CodeGenCXX/bpf-debug-info-alias.cpp b/clang/test/CodeGenCXX/bpf-debug-info-alias.cpp
new file mode 100644
index 0000000000000..66d64c37ae806
--- /dev/null
+++ b/clang/test/CodeGenCXX/bpf-debug-info-alias.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -triple bpfel -emit-llvm -debug-info-kind=constructor %s -o - | FileCheck %s
+
+// CHECK: @_Z9__cat_op0v = alias void (), ptr @e
+// CHECK: @alias_var = alias i32, ptr @global_var
+// CHECK-DAG: !DIImportedEntity(tag: DW_TAG_imported_declaration, name: "__cat_op0", {{.*}} entity: ![[ENTITY:[0-9]+]]
+// CHECK-DAG: ![[ENTITY]] = {{.*}}!DISubprogram(name: "__cat_op0", linkageName: "_Z9__cat_op0v"
+// CHECK-DAG: !DIImportedEntity(tag: DW_TAG_imported_declaration, name: "alias_var", {{.*}} entity: ![[ENTITY2:[0-9]+]]
+// CHECK-DAG: ![[ENTITY2]] = {{.*}}!DIGlobalVariable(name: "global_var", {{.*}}
+
+extern "C" void e() {}
+void __attribute__((alias("e"))) __cat_op0();
+void r() { __cat_op0(); }
+
+int global_var;
+extern "C" int alias_var __attribute__((alias("global_var")));
+int use_alias() { return alias_var; }