[clang] [OpenACC][CIR] Implement 'init' lowering for private clause vars (PR #151781)

[Andy Kaylor via cfe-commits]

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@@ -2552,3 +2553,50 @@ ExprResult
 SemaOpenACC::ActOnOpenACCAsteriskSizeExpr(SourceLocation AsteriskLoc) {
   return BuildOpenACCAsteriskSizeExpr(AsteriskLoc);
 }
+
+VarDecl *SemaOpenACC::CreateInitRecipe(const Expr *VarExpr) {
+  // Strip off any array subscripts/array section exprs to get to the type of
+  // the variable.
+  while (isa_and_present<ArraySectionExpr, ArraySubscriptExpr>(VarExpr)) {
+    if (const auto *AS = dyn_cast<ArraySectionExpr>(VarExpr))
+      VarExpr = AS->getBase()->IgnoreParenImpCasts();
+    else if (const auto *Sub = dyn_cast<ArraySubscriptExpr>(VarExpr))
+      VarExpr = Sub->getBase()->IgnoreParenImpCasts();
+  }
+
+  // If for some reason the expression is invalid, or this is dependent, just
+  // fill in with nullptr.  We'll count on TreeTransform to make this if
+  // necessary.
+  if (!VarExpr || VarExpr->getType()->isDependentType())
+    return nullptr;
+
+  QualType VarTy =
+      VarExpr->getType().getNonReferenceType().getUnqualifiedType();
+
+  VarDecl *Recipe = VarDecl::Create(
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andykaylor wrote:

Where does this get deleted?

https://github.com/llvm/llvm-project/pull/151781