Representation of and template instantiation for member

expressions. This change introduces another AST node,
CXXUnresolvedMemberExpr, that captures member references (x->m, x.m)
when the base of the expression (the "x") is type-dependent, and we
therefore cannot resolve the member reference yet.

Note that our parsing of member references for C++ is still quite
poor, e.g., we don't handle x->Base::m or x->operator int.

llvm-svn: 72281

1 files changed, 60 insertions, 0 deletions

diff --git a/clang/test/SemaTemplate/instantiate-expr-4.cpp b/clang/test/SemaTemplate/instantiate-expr-4.cpp
index 09d574176ac..0f2bb93f413 100644
--- a/clang/test/SemaTemplate/instantiate-expr-4.cpp
+++ b/clang/test/SemaTemplate/instantiate-expr-4.cpp
@@ -178,3 +178,63 @@ struct InitList2 {
 
 template struct InitList2<APair, int*, float*>;
 template struct InitList2<APair, int*, double*>; // expected-note{{instantiation}}
+
+// ---------------------------------------------------------------------
+// member references
+// ---------------------------------------------------------------------
+template<typename T, typename Result>
+struct DotMemRef0 {
+  void f(T t) {
+    Result result = t.m; // expected-error{{cannot be initialized}}
+  }
+};
+
+struct MemInt {
+  int m;
+};
+
+struct InheritsMemInt : MemInt { };
+
+struct MemIntFunc {
+  static int m(int);
+};
+
+template struct DotMemRef0<MemInt, int&>;
+template struct DotMemRef0<InheritsMemInt, int&>;
+template struct DotMemRef0<MemIntFunc, int (*)(int)>;
+template struct DotMemRef0<MemInt, float&>; // expected-note{{instantiation}}
+
+template<typename T, typename Result>
+struct ArrowMemRef0 {
+  void f(T t) {
+    Result result = t->m; // expected-error 2{{cannot be initialized}}
+  }
+};
+
+template<typename T>
+struct ArrowWrapper {
+  T operator->();
+};
+
+template struct ArrowMemRef0<MemInt*, int&>;
+template struct ArrowMemRef0<InheritsMemInt*, int&>;
+template struct ArrowMemRef0<MemIntFunc*, int (*)(int)>;
+template struct ArrowMemRef0<MemInt*, float&>; // expected-note{{instantiation}}
+
+template struct ArrowMemRef0<ArrowWrapper<MemInt*>, int&>;
+template struct ArrowMemRef0<ArrowWrapper<InheritsMemInt*>, int&>;
+template struct ArrowMemRef0<ArrowWrapper<MemIntFunc*>, int (*)(int)>;
+template struct ArrowMemRef0<ArrowWrapper<MemInt*>, float&>; // expected-note{{instantiation}}
+template struct ArrowMemRef0<ArrowWrapper<ArrowWrapper<MemInt*> >, int&>;
+
+// FIXME: we should be able to return a MemInt without the reference!
+MemInt &createMemInt(int);
+
+template<int N>
+struct NonDepMemberExpr0 {
+  void f() {
+    createMemInt(N).m = N;
+  }
+};
+
+template struct NonDepMemberExpr0<0>;