Abstract out member-pointer conversions.
Pretty much everything having to do with member pointers is ABI-specific.
llvm-svn: 111770
diff --git a/clang/lib/CodeGen/ItaniumCXXABI.cpp b/clang/lib/CodeGen/ItaniumCXXABI.cpp
index 9ab7591..9fc6be1 100644
--- a/clang/lib/CodeGen/ItaniumCXXABI.cpp
+++ b/clang/lib/CodeGen/ItaniumCXXABI.cpp
@@ -46,6 +46,12 @@
llvm::Value *&This,
llvm::Value *MemFnPtr,
const MemberPointerType *MPT);
+
+ void EmitMemberPointerConversion(CodeGenFunction &CGF,
+ const CastExpr *E,
+ llvm::Value *Src,
+ llvm::Value *Dest,
+ bool VolatileDest);
};
class ARMCXXABI : public ItaniumCXXABI {
@@ -168,3 +174,54 @@
Callee->addIncoming(NonVirtualFn, FnNonVirtual);
return Callee;
}
+
+/// Perform a derived-to-base or base-to-derived member pointer conversion.
+void ItaniumCXXABI::EmitMemberPointerConversion(CodeGenFunction &CGF,
+ const CastExpr *E,
+ llvm::Value *Src,
+ llvm::Value *Dest,
+ bool VolatileDest) {
+ assert(E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer ||
+ E->getCastKind() == CastExpr::CK_BaseToDerivedMemberPointer);
+
+ CGBuilderTy &Builder = CGF.Builder;
+
+ const MemberPointerType *SrcTy =
+ E->getSubExpr()->getType()->getAs<MemberPointerType>();
+ const MemberPointerType *DestTy = E->getType()->getAs<MemberPointerType>();
+
+ const CXXRecordDecl *SrcDecl = SrcTy->getClass()->getAsCXXRecordDecl();
+ const CXXRecordDecl *DestDecl = DestTy->getClass()->getAsCXXRecordDecl();
+
+ llvm::Value *SrcPtr = Builder.CreateStructGEP(Src, 0, "src.ptr");
+ SrcPtr = Builder.CreateLoad(SrcPtr);
+
+ llvm::Value *SrcAdj = Builder.CreateStructGEP(Src, 1, "src.adj");
+ SrcAdj = Builder.CreateLoad(SrcAdj);
+
+ llvm::Value *DstPtr = Builder.CreateStructGEP(Dest, 0, "dst.ptr");
+ Builder.CreateStore(SrcPtr, DstPtr, VolatileDest);
+
+ llvm::Value *DstAdj = Builder.CreateStructGEP(Dest, 1, "dst.adj");
+
+ bool DerivedToBase =
+ E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer;
+
+ const CXXRecordDecl *BaseDecl, *DerivedDecl;
+ if (DerivedToBase)
+ DerivedDecl = SrcDecl, BaseDecl = DestDecl;
+ else
+ BaseDecl = SrcDecl, DerivedDecl = DestDecl;
+
+ if (llvm::Constant *Adj =
+ CGF.CGM.GetNonVirtualBaseClassOffset(DerivedDecl,
+ E->path_begin(),
+ E->path_end())) {
+ if (DerivedToBase)
+ SrcAdj = Builder.CreateSub(SrcAdj, Adj, "adj");
+ else
+ SrcAdj = Builder.CreateAdd(SrcAdj, Adj, "adj");
+ }
+
+ Builder.CreateStore(SrcAdj, DstAdj, VolatileDest);
+}