[clang] [CIR] Upstream support for generating global ctor regions (PR #161298)

[Henrich Lauko via cfe-commits]

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@@ -15,10 +15,72 @@
 
 #include "clang/AST/GlobalDecl.h"
 #include "clang/CIR/MissingFeatures.h"
+#include "llvm/Support/SaveAndRestore.h"
 
 using namespace clang;
 using namespace clang::CIRGen;
 
+static void emitDeclInit(CIRGenFunction &cgf, const VarDecl *varDecl,
+                         Address declPtr) {
+  assert((varDecl->hasGlobalStorage() ||
+          (varDecl->hasLocalStorage() &&
+           cgf.getContext().getLangOpts().OpenCLCPlusPlus)) &&
+         "VarDecl must have global or local (in the case of OpenCL) storage!");
+  assert(!varDecl->getType()->isReferenceType() &&
+         "Should not call emitDeclInit on a reference!");
+
+  QualType type = varDecl->getType();
+  LValue lv = cgf.makeAddrLValue(declPtr, type);
+
+  const Expr *init = varDecl->getInit();
+  switch (CIRGenFunction::getEvaluationKind(type)) {
+  case cir::TEK_Scalar:
+    assert(!cir::MissingFeatures::objCGC());
+    cgf.emitScalarInit(init, cgf.getLoc(varDecl->getLocation()), lv, false);
+    return;
+  case cir::TEK_Complex:
+    cgf.cgm.errorNYI(varDecl->getSourceRange(), "complex global initializer");
+    return;
+  case cir::TEK_Aggregate:
+    assert(!cir::MissingFeatures::aggValueSlotGC());
+    cgf.emitAggExpr(init,
+                    AggValueSlot::forLValue(lv, AggValueSlot::IsDestructed,
+                                            AggValueSlot::IsNotAliased,
----------------
xlauko wrote:

OGCG takes here `AggValueSlot::DoesNotNeedGCBarrier` as well.
Any reason it is missing?

https://github.com/llvm/llvm-project/pull/161298