[CIR] Add support for global ctor/dtor attributes (#163247)

This adds support for adding the `global_ctor` or `global_dtor`
attribute to the CIR representation of functions defined with
`__attribute__((constructor))` or `__attribute__((destructor))` and
adding them to the `@llvm.global_ctors` or `@llvm.global_dtors` list
during lowering to LLVM IR.

1 files changed, 7 insertions, 1 deletions

diff --git a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
index 26e0ba9b4e45..f0d73ac87238 100644
--- a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
+++ b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
@@ -2598,7 +2598,13 @@ void ConvertCIRToLLVMPass::runOnOperation() {
                       return std::make_pair(ctorAttr.getName(),
                                             ctorAttr.getPriority());
                     });
-  assert(!cir::MissingFeatures::opGlobalDtorList());
+  // Emit the llvm.global_dtors array.
+  buildCtorDtorList(module, cir::CIRDialect::getGlobalDtorsAttrName(),
+                    "llvm.global_dtors", [](mlir::Attribute attr) {
+                      auto dtorAttr = mlir::cast<cir::GlobalDtorAttr>(attr);
+                      return std::make_pair(dtorAttr.getName(),
+                                            dtorAttr.getPriority());
+                    });
 }
 
 mlir::LogicalResult CIRToLLVMBrOpLowering::matchAndRewrite(