From dc293b3fe9e3cb7eb7ce7035b32218251a06fbfe Mon Sep 17 00:00:00 2001
From: Manman Ren <manman.ren@gmail.com>
Date: Wed, 11 Sep 2013 18:55:55 +0000
Subject: [PATCH] Debug Info: move class definition of DIRef.

Definition of DIRef used to require the full definition of DIType because
of usage of DIType::isType in DIRef::resolve. We now use DIDescriptor::isType
instead to remove the requirement and move definition of DIRef before DIType.

With this, we can move the definition of DIType::getContext to the header
file.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190540 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/DebugInfo.h | 96 ++++++++++++++++++++++++------------------------
 lib/IR/DebugInfo.cpp     |  4 --
 2 files changed, 48 insertions(+), 52 deletions(-)

diff --git a/include/llvm/DebugInfo.h b/include/llvm/DebugInfo.h
index deebcfd4395..515dc65162b 100644
--- a/include/llvm/DebugInfo.h
+++ b/include/llvm/DebugInfo.h
@@ -193,6 +193,7 @@ namespace llvm {
   template <typename T>
   class DIRef;
   typedef DIRef<DIScope> DIScopeRef;
+  typedef DIRef<DIType> DITypeRef;
 
   /// DIScope - A base class for various scopes.
   class DIScope : public DIDescriptor {
@@ -213,6 +214,52 @@ namespace llvm {
     DIScopeRef generateRef();
   };
 
+  /// Represents reference to a DIDescriptor, abstracts over direct and
+  /// identifier-based metadata references.
+  template <typename T>
+  class DIRef {
+    template <typename DescTy>
+    friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
+    friend DIScopeRef DIScope::getContext() const;
+    friend DIScopeRef DIScope::generateRef();
+
+    /// Val can be either a MDNode or a MDString, in the latter,
+    /// MDString specifies the type identifier.
+    const Value *Val;
+    explicit DIRef(const Value *V);
+  public:
+    T resolve(const DITypeIdentifierMap &Map) const {
+      if (!Val)
+        return T();
+
+      if (const MDNode *MD = dyn_cast<MDNode>(Val))
+        return T(MD);
+
+      const MDString *MS = cast<MDString>(Val);
+      // Find the corresponding MDNode.
+      DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
+      assert(Iter != Map.end() && "Identifier not in the type map?");
+      assert(DIDescriptor(Iter->second).isType() &&
+             "MDNode in DITypeIdentifierMap should be a DIType.");
+      return T(Iter->second);
+    }
+    operator Value *() const { return const_cast<Value*>(Val); }
+  };
+
+  /// Specialize getFieldAs to handle fields that are references to DIScopes.
+  template <>
+  DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
+  /// Specialize DIRef constructor for DIScopeRef.
+  template <>
+  DIRef<DIScope>::DIRef(const Value *V);
+
+  /// Specialize getFieldAs to handle fields that are references to DITypes.
+  template <>
+  DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
+  /// Specialize DIRef constructor for DITypeRef.
+  template <>
+  DIRef<DIType>::DIRef(const Value *V);
+
   /// DIType - This is a wrapper for a type.
   /// FIXME: Types should be factored much better so that CV qualifiers and
   /// others do not require a huge and empty descriptor full of zeros.
@@ -227,7 +274,7 @@ namespace llvm {
     /// Verify - Verify that a type descriptor is well formed.
     bool Verify() const;
 
-    DIScopeRef getContext() const;
+    DIScopeRef getContext() const       { return getFieldAs<DIScopeRef>(2); }
     StringRef getName() const           { return getStringField(3);     }
     unsigned getLineNumber() const      { return getUnsignedField(4); }
     uint64_t getSizeInBits() const      { return getUInt64Field(5); }
@@ -283,53 +330,6 @@ namespace llvm {
     void replaceAllUsesWith(MDNode *D);
   };
 
-  /// Represents reference to a DIDescriptor, abstracts over direct and
-  /// identifier-based metadata references.
-  template <typename T>
-  class DIRef {
-    template <typename DescTy>
-    friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
-    friend DIScopeRef DIScope::getContext() const;
-    friend DIScopeRef DIScope::generateRef();
-
-    /// Val can be either a MDNode or a MDString, in the latter,
-    /// MDString specifies the type identifier.
-    const Value *Val;
-    explicit DIRef(const Value *V);
-  public:
-    T resolve(const DITypeIdentifierMap &Map) const {
-      if (!Val)
-        return T();
-
-      if (const MDNode *MD = dyn_cast<MDNode>(Val))
-        return T(MD);
-
-      const MDString *MS = cast<MDString>(Val);
-      // Find the corresponding MDNode.
-      DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
-      assert(Iter != Map.end() && "Identifier not in the type map?");
-      assert(DIType(Iter->second).isType() &&
-             "MDNode in DITypeIdentifierMap should be a DIType.");
-      return T(Iter->second);
-    }
-    operator Value *() const { return const_cast<Value*>(Val); }
-  };
-
-  /// Specialize getFieldAs to handle fields that are references to DIScopes.
-  template <>
-  DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
-  /// Specialize DIRef constructor for DIScopeRef.
-  template <>
-  DIRef<DIScope>::DIRef(const Value *V);
-
-  typedef DIRef<DIType> DITypeRef;
-  /// Specialize getFieldAs to handle fields that are references to DITypes.
-  template <>
-  DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
-  /// Specialize DIRef constructor for DITypeRef.
-  template <>
-  DIRef<DIType>::DIRef(const Value *V);
-
   /// DIBasicType - A basic type, like 'int' or 'float'.
   class DIBasicType : public DIType {
   public:
diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index 87984a09759..e5a92ab15d9 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -1452,7 +1452,3 @@ template <>
 DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const {
   return DITypeRef(getField(DbgNode, Elt));
 }
-
-DIScopeRef DIType::getContext() const {
-  return getFieldAs<DIScopeRef>(2);
-}
-- 
2.11.0