From 1114e434b00f9559408610488fe2bde596f2cfbd Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Mon, 6 Apr 2015 21:30:23 +0000
Subject: [PATCH] Revert "DebugInfo: Loosen DILexicalBlock constructor"

This reverts commit r234222, while I look into bot failures [1].  I'll
recommit soon.

[1]: http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-incremental_check/7117/

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234225 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/IR/DebugInfo.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/llvm/IR/DebugInfo.h b/include/llvm/IR/DebugInfo.h
index 24dd02056ad..2fa68982ac8 100644
--- a/include/llvm/IR/DebugInfo.h
+++ b/include/llvm/IR/DebugInfo.h
@@ -704,7 +704,7 @@ public:
 class DILexicalBlock : public DIScope {
 public:
   explicit DILexicalBlock(const MDNode *N = nullptr) : DIScope(N) {}
-  DILexicalBlock(const MDLexicalBlockBase *N) : DIScope(N) {}
+  DILexicalBlock(const MDLexicalBlock *N) : DIScope(N) {}
 
   MDLexicalBlockBase *get() const {
     return cast_or_null<MDLexicalBlockBase>(DIDescriptor::get());
@@ -745,12 +745,10 @@ public:
     return *get();
   }
 
-  DIScope getContext() const { return get()->getScope(); }
+  DIScope getContext() const { return getScope(); }
   unsigned getLineNumber() const { return getScope().getLineNumber(); }
   unsigned getColumnNumber() const { return getScope().getColumnNumber(); }
-  DILexicalBlock getScope() const {
-    return dyn_cast<MDLexicalBlockBase>(get()->getScope());
-  }
+  DILexicalBlock getScope() const { return DILexicalBlock(get()->getScope()); }
   unsigned getDiscriminator() const { return get()->getDiscriminator(); }
 };
 
@@ -1052,9 +1050,11 @@ public:
     // Since discriminators are associated with lexical blocks, make
     // sure this location is a lexical block before retrieving its
     // value.
-    if (auto *F = dyn_cast<MDLexicalBlockFile>(get()->getScope()))
-      return F->getDiscriminator();
-    return 0;
+    return getScope().isLexicalBlockFile()
+               ? DILexicalBlockFile(
+                     cast<MDNode>(cast<MDLocation>(DbgNode)->getScope()))
+                     .getDiscriminator()
+               : 0;
   }
 
   /// \brief Generate a new discriminator value for this location.
-- 
2.34.1