-Wunreachable-code: refine recognition of unreachable "sigil" to cope with implicit casts in C++.

Fixes <rdar://problem/16631033>.

llvm-svn: 206360

1 files changed, 21 insertions, 0 deletions

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index f023fe804b6..4ddd0a239aa 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -2400,6 +2400,27 @@ Expr *Expr::IgnoreParenCasts() {
   }
 }
 
+Expr *Expr::IgnoreCasts() {
+  Expr *E = this;
+  while (true) {
+    if (CastExpr *P = dyn_cast<CastExpr>(E)) {
+      E = P->getSubExpr();
+      continue;
+    }
+    if (MaterializeTemporaryExpr *Materialize
+        = dyn_cast<MaterializeTemporaryExpr>(E)) {
+      E = Materialize->GetTemporaryExpr();
+      continue;
+    }
+    if (SubstNonTypeTemplateParmExpr *NTTP
+        = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
+      E = NTTP->getReplacement();
+      continue;
+    }
+    return E;
+  }
+}
+
 /// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue
 /// casts.  This is intended purely as a temporary workaround for code
 /// that hasn't yet been rewritten to do the right thing about those