Introduce a new expression type, CXXUnresolvedConstructExpr, to

describe the construction of a value of a given type using function
syntax, e.g.,
  
  T(a1, a2, ..., aN)

when the type or any of its arguments are type-dependent. In this
case, we don't know what kind of type-construction this will be: it
might construct a temporary of type 'T' (which might be a class or
non-class type) or might perform a conversion to type 'T'. Also,
implement printing of and template instantiation for this new
expression type. Due to the change in Sema::ActOnCXXTypeConstructExpr,
our existing tests cover template instantiation of this new expression
node.

llvm-svn: 72176

1 files changed, 39 insertions, 0 deletions

diff --git a/clang/lib/AST/ExprCXX.cpp b/clang/lib/AST/ExprCXX.cpp
index a138f01c778..a73843ca363 100644
--- a/clang/lib/AST/ExprCXX.cpp
+++ b/clang/lib/AST/ExprCXX.cpp
@@ -314,6 +314,45 @@ Stmt::child_iterator CXXExprWithTemporaries::child_end() {
   return &SubExpr + 1;
 }
 
+CXXUnresolvedConstructExpr::CXXUnresolvedConstructExpr(
+                                                 SourceLocation TyBeginLoc,
+                                                 QualType T,
+                                                 SourceLocation LParenLoc,
+                                                 Expr **Args,
+                                                 unsigned NumArgs,
+                                                 SourceLocation RParenLoc)
+  : Expr(CXXUnresolvedConstructExprClass, T.getNonReferenceType(),
+         T->isDependentType(), true),
+    TyBeginLoc(TyBeginLoc),
+    Type(T),
+    LParenLoc(LParenLoc),
+    RParenLoc(RParenLoc),
+    NumArgs(NumArgs) {
+  Stmt **StoredArgs = reinterpret_cast<Stmt **>(this + 1);
+  memcpy(StoredArgs, Args, sizeof(Expr *) * NumArgs);
+}
+
+CXXUnresolvedConstructExpr *
+CXXUnresolvedConstructExpr::Create(ASTContext &C, 
+                                   SourceLocation TyBegin,
+                                   QualType T,
+                                   SourceLocation LParenLoc,
+                                   Expr **Args,
+                                   unsigned NumArgs,
+                                   SourceLocation RParenLoc) {
+  void *Mem = C.Allocate(sizeof(CXXUnresolvedConstructExpr) +
+                         sizeof(Expr *) * NumArgs);
+  return new (Mem) CXXUnresolvedConstructExpr(TyBegin, T, LParenLoc,
+                                              Args, NumArgs, RParenLoc);
+}
+
+Stmt::child_iterator CXXUnresolvedConstructExpr::child_begin() {
+  return child_iterator(reinterpret_cast<Stmt **>(this + 1));
+}
+
+Stmt::child_iterator CXXUnresolvedConstructExpr::child_end() {
+  return child_iterator(reinterpret_cast<Stmt **>(this + 1) + NumArgs);
+}
 
 //===----------------------------------------------------------------------===//
 //  Cloners