From 51954276ccee058ba3e82f41fb09e77da39d2d85 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Tue, 13 Jul 2010 23:17:26 +0000
Subject: Introduce a new cast kind for an "lvalue bitcast", which handles
 reinterpret_casts (possibly indirectly via C-style/functional casts) on
 values, e.g.,

  int i;
  reinterpret_cast<short&>(i);

The IR generated for this is essentially the same as for

  *reinterpret_cast<short*>(&i).

Fixes PR6437, PR7593, and PR7344.

llvm-svn: 108294
---
 clang/lib/CodeGen/CGExprAgg.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'clang/lib/CodeGen/CGExprAgg.cpp')

diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index 20722f7..219a5f9 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -307,6 +307,10 @@ void AggExprEmitter::VisitCastExpr(CastExpr *E) {
     break;
   }
       
+  case CastExpr::CK_LValueBitCast:
+    llvm_unreachable("there are no lvalue bit-casts on aggregates");
+    break;
+      
   case CastExpr::CK_BitCast: {
     // This must be a member function pointer cast.
     Visit(E->getSubExpr());
-- 
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