From d196a58b557ba388241547c06d76f3a30085f4fc Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Mon, 14 Dec 2009 19:27:10 +0000
Subject: Improve template instantiation for object constructions in several
 ways:

  - During instantiation, drop default arguments from constructor and
    call expressions; they'll be recomputed anyway, and we don't want
    to instantiate them twice.
  - Rewrote the instantiation of variable initializers to cope with
    non-dependent forms properly.

Together, these fix a handful of problems I introduced with the switch
to always rebuild expressions from the source code "as written."

llvm-svn: 91315
---
 clang/lib/AST/Expr.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'clang/lib/AST/Expr.cpp')

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index 6d9a2689933..139e04b2ed5 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -568,6 +568,30 @@ const char *CastExpr::getCastKindName() const {
   return 0;
 }
 
+Expr *CastExpr::getSubExprAsWritten() {
+  Expr *SubExpr = 0;
+  CastExpr *E = this;
+  do {
+    SubExpr = E->getSubExpr();
+    
+    // Skip any temporary bindings; they're implicit.
+    if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
+      SubExpr = Binder->getSubExpr();
+    
+    // Conversions by constructor and conversion functions have a
+    // subexpression describing the call; strip it off.
+    if (E->getCastKind() == CastExpr::CK_ConstructorConversion)
+      SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0);
+    else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion)
+      SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument();
+    
+    // If the subexpression we're left with is an implicit cast, look
+    // through that, too.
+  } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));  
+  
+  return SubExpr;
+}
+
 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
 /// corresponds to, e.g. "<<=".
 const char *BinaryOperator::getOpcodeStr(Opcode Op) {
@@ -1347,6 +1371,13 @@ Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
   }
 }
 
+bool Expr::isDefaultArgument() const {
+  const Expr *E = this;
+  while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
+    E = ICE->getSubExprAsWritten();
+  
+  return isa<CXXDefaultArgExpr>(E);
+}
 
 /// hasAnyTypeDependentArguments - Determines if any of the expressions
 /// in Exprs is type-dependent.
-- 
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