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| author | John McCall <rjmccall@apple.com> | 2010-03-30 23:58:03 +0000 |
|---|---|---|
| committer | John McCall <rjmccall@apple.com> | 2010-03-30 23:58:03 +0000 |
| commit | 23cba801e11b03929c44f8cf54578305963a3476 (patch) | |
| tree | 7a1edfa728d0b5e9f0a9732d0faaec43ad2aa242 /lib/CodeGen/CGExprScalar.cpp | |
| parent | 658f679b63cf92204d707c5dfc1251ae8f3c0762 (diff) | |
Introduce a new kind of derived-to-base cast which bypasses the need for
null checks, and make sure we elide null checks when accessing base class
members.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99963 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/CGExprScalar.cpp')
| -rw-r--r-- | lib/CodeGen/CGExprScalar.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp index 1ef06ccf6f..42bf68ed52 100644 --- a/lib/CodeGen/CGExprScalar.cpp +++ b/lib/CodeGen/CGExprScalar.cpp @@ -769,6 +769,9 @@ Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) { static bool ShouldNullCheckClassCastValue(const CastExpr *CE) { const Expr *E = CE->getSubExpr(); + + if (CE->getCastKind() == CastExpr::CK_UncheckedDerivedToBase) + return false; if (isa<CXXThisExpr>(E)) { // We always assume that 'this' is never null. @@ -826,6 +829,7 @@ Value *ScalarExprEmitter::EmitCastExpr(CastExpr *CE) { return CGF.GetAddressOfDerivedClass(Src, BaseClassDecl, DerivedClassDecl, NullCheckValue); } + case CastExpr::CK_UncheckedDerivedToBase: case CastExpr::CK_DerivedToBase: { const RecordType *DerivedClassTy = E->getType()->getAs<PointerType>()->getPointeeType()->getAs<RecordType>(); |