When emitting an lvalue for an anonymous struct or union member during
class initialization, drill down through an arbitrary number of anonymous
records.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104310 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index 80d38f2..74e64e5 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -1611,6 +1611,35 @@
Field->getType().getCVRQualifiers()|CVRQualifiers);
}
+/// EmitLValueForAnonRecordField - Given that the field is a member of
+/// an anonymous struct or union buried inside a record, and given
+/// that the base value is a pointer to the enclosing record, derive
+/// an lvalue for the ultimate field.
+LValue CodeGenFunction::EmitLValueForAnonRecordField(llvm::Value *BaseValue,
+ const FieldDecl *Field,
+ unsigned CVRQualifiers) {
+ llvm::SmallVector<const FieldDecl *, 8> Path;
+ Path.push_back(Field);
+
+ while (Field->getParent()->isAnonymousStructOrUnion()) {
+ const ValueDecl *VD = Field->getParent()->getAnonymousStructOrUnionObject();
+ if (!isa<FieldDecl>(VD)) break;
+ Field = cast<FieldDecl>(VD);
+ Path.push_back(Field);
+ }
+
+ llvm::SmallVectorImpl<const FieldDecl*>::reverse_iterator
+ I = Path.rbegin(), E = Path.rend();
+ while (true) {
+ LValue LV = EmitLValueForField(BaseValue, *I, CVRQualifiers);
+ if (++I == E) return LV;
+
+ assert(LV.isSimple());
+ BaseValue = LV.getAddress();
+ CVRQualifiers |= LV.getVRQualifiers();
+ }
+}
+
LValue CodeGenFunction::EmitLValueForField(llvm::Value* BaseValue,
const FieldDecl* Field,
unsigned CVRQualifiers) {