Temporarily revert r191792 as it is causing some LTO debug failures

on platforms with relocations in debug info and also temporarily
revert r191800 due to conflicts with the revert of r191792.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191967 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 60 insertions, 27 deletions

diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index f5e7e26..4226708 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -368,6 +368,23 @@ void DIType::replaceAllUsesWith(MDNode *D) {
   }
 }
 
+/// isUnsignedDIType - Return true if type encoding is unsigned.
+bool DIType::isUnsignedDIType() {
+  DIDerivedType DTy(DbgNode);
+  if (DTy.Verify())
+    return DTy.getTypeDerivedFrom().isUnsignedDIType();
+
+  DIBasicType BTy(DbgNode);
+  if (BTy.Verify()) {
+    unsigned Encoding = BTy.getEncoding();
+    if (Encoding == dwarf::DW_ATE_unsigned ||
+        Encoding == dwarf::DW_ATE_unsigned_char ||
+        Encoding == dwarf::DW_ATE_boolean)
+      return true;
+  }
+  return false;
+}
+
 /// Verify - Verify that a compile unit is well formed.
 bool DICompileUnit::Verify() const {
   if (!isCompileUnit())
@@ -476,8 +493,8 @@ bool DIBasicType::Verify() const {
 
 /// Verify - Verify that a derived type descriptor is well formed.
 bool DIDerivedType::Verify() const {
-  // Make sure DerivedFrom @ field 9 is TypeRef.
-  if (!fieldIsTypeRef(DbgNode, 9))
+  // Make sure DerivedFrom @ field 9 is MDNode.
+  if (!fieldIsMDNode(DbgNode, 9))
     return false;
   if (getTag() == dwarf::DW_TAG_ptr_to_member_type)
     // Make sure ClassType @ field 10 is a TypeRef.
@@ -493,8 +510,8 @@ bool DICompositeType::Verify() const {
   if (!isCompositeType())
     return false;
 
-  // Make sure DerivedFrom @ field 9 and ContainingType @ field 12 are TypeRef.
-  if (!fieldIsTypeRef(DbgNode, 9))
+  // Make sure DerivedFrom @ field 9 and ContainingType @ field 12 are MDNodes.
+  if (!fieldIsMDNode(DbgNode, 9))
     return false;
   if (!fieldIsTypeRef(DbgNode, 12))
     return false;
@@ -503,6 +520,12 @@ bool DICompositeType::Verify() const {
   if (!fieldIsMDString(DbgNode, 14))
     return false;
 
+  // If this is an array type verify that we have a DIType in the derived type
+  // field as that's the type of our element.
+  if (getTag() == dwarf::DW_TAG_array_type)
+    if (!DIType(getTypeDerivedFrom()))
+      return false;
+
   return DbgNode->getNumOperands() == 15;
 }
 
@@ -615,6 +638,35 @@ bool DIImportedEntity::Verify() const {
          (DbgNode->getNumOperands() == 4 || DbgNode->getNumOperands() == 5);
 }
 
+/// getOriginalTypeSize - If this type is derived from a base type then
+/// return base type size.
+uint64_t DIDerivedType::getOriginalTypeSize() const {
+  uint16_t Tag = getTag();
+
+  if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
+      Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
+      Tag != dwarf::DW_TAG_restrict_type)
+    return getSizeInBits();
+
+  DIType BaseType = getTypeDerivedFrom();
+
+  // If this type is not derived from any type then take conservative approach.
+  if (!BaseType.isValid())
+    return getSizeInBits();
+
+  // If this is a derived type, go ahead and get the base type, unless it's a
+  // reference then it's just the size of the field. Pointer types have no need
+  // of this since they're a different type of qualification on the type.
+  if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
+      BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
+    return getSizeInBits();
+
+  if (BaseType.isDerivedType())
+    return DIDerivedType(BaseType).getOriginalTypeSize();
+
+  return BaseType.getSizeInBits();
+}
+
 /// getObjCProperty - Return property node, if this ivar is associated with one.
 MDNode *DIDerivedType::getObjCProperty() const {
   return getNodeField(DbgNode, 10);
@@ -756,19 +808,6 @@ DIScopeRef DIScope::getContext() const {
   return DIScopeRef(NULL);
 }
 
-// If the scope node has a name, return that, else return an empty string.
-StringRef DIScope::getName() const {
-  if (isType())
-    return DIType(DbgNode).getName();
-  if (isSubprogram())
-    return DISubprogram(DbgNode).getName();
-  if (isNameSpace())
-    return DINameSpace(DbgNode).getName();
-  assert((isLexicalBlock() || isLexicalBlockFile() || isFile() ||
-          isCompileUnit()) && "Unhandled type of scope.");
-  return StringRef();
-}
-
 StringRef DIScope::getFilename() const {
   if (!DbgNode)
     return StringRef();
@@ -903,14 +942,8 @@ DICompositeType llvm::getDICompositeType(DIType T) {
   if (T.isCompositeType())
     return DICompositeType(T);
 
-  if (T.isDerivedType()) {
-    // This function is currently used by dragonegg and dragonegg does
-    // not generate identifier for types, so using an empty map to resolve
-    // DerivedFrom should be fine.
-    DITypeIdentifierMap EmptyMap;
-    return getDICompositeType(DIDerivedType(T).getTypeDerivedFrom()
-                                              .resolve(EmptyMap));
-  }
+  if (T.isDerivedType())
+    return getDICompositeType(DIDerivedType(T).getTypeDerivedFrom());
 
   return DICompositeType();
 }
@@ -1011,7 +1044,7 @@ void DebugInfoFinder::processType(DIType DT) {
   processScope(DT.getContext().resolve(TypeIdentifierMap));
   if (DT.isCompositeType()) {
     DICompositeType DCT(DT);
-    processType(DCT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
+    processType(DCT.getTypeDerivedFrom());
     DIArray DA = DCT.getTypeArray();
     for (unsigned i = 0, e = DA.getNumElements(); i != e; ++i) {
       DIDescriptor D = DA.getElement(i);
@@ -1022,7 +1055,7 @@ void DebugInfoFinder::processType(DIType DT) {
     }
   } else if (DT.isDerivedType()) {
     DIDerivedType DDT(DT);
-    processType(DDT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
+    processType(DDT.getTypeDerivedFrom());
   }
 }