DebugInfo: Omit DW_AT_artificial on DW_TAG_formal_parameters in DW_TAG_inlined_subroutines.

They just don't need to be there - they're inherited from the abstract
definition. In theory I would like them to be inherited from the
declaration, but the DWARF standard doesn't quite say that... we can
probably do it anyway but I'm less confident about that so I'll leave it
for a separate commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207717 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -509,6 +509,21 @@ DwarfDebug::constructInlinedScopeDIE(DwarfCompileUnit &TheCU,
   return ScopeDIE;
 }
 
+static std::unique_ptr<DIE> constructVariableDIE(DwarfCompileUnit &TheCU,
+                                                 DbgVariable &DV,
+                                                 const LexicalScope &Scope,
+                                                 DIE *&ObjectPointer) {
+  AbstractOrInlined AOI = AOI_None;
+  if (Scope.isAbstractScope())
+    AOI = AOI_Abstract;
+  else if (Scope.getInlinedAt())
+    AOI = AOI_Inlined;
+  auto Var = TheCU.constructVariableDIE(DV, AOI);
+  if (DV.isObjectPointer())
+    ObjectPointer = Var.get();
+  return Var;
+}
+
 DIE *DwarfDebug::createScopeChildrenDIE(
     DwarfCompileUnit &TheCU, LexicalScope *Scope,
     SmallVectorImpl<std::unique_ptr<DIE>> &Children) {
@@ -517,12 +532,9 @@ DIE *DwarfDebug::createScopeChildrenDIE(
   // Collect arguments for current function.
   if (LScopes.isCurrentFunctionScope(Scope)) {
     for (DbgVariable *ArgDV : CurrentFnArguments)
-      if (ArgDV) {
+      if (ArgDV)
         Children.push_back(
-            TheCU.constructVariableDIE(*ArgDV, Scope->isAbstractScope()));
-        if (ArgDV->isObjectPointer())
-          ObjectPointer = Children.back().get();
-      }
+            constructVariableDIE(TheCU, *ArgDV, *Scope, ObjectPointer));
 
     // If this is a variadic function, add an unspecified parameter.
     DISubprogram SP(Scope->getScopeNode());
@@ -535,12 +547,9 @@ DIE *DwarfDebug::createScopeChildrenDIE(
   }
 
   // Collect lexical scope children first.
-  for (DbgVariable *DV : ScopeVariables.lookup(Scope)) {
-    Children.push_back(
-        TheCU.constructVariableDIE(*DV, Scope->isAbstractScope()));
-    if (DV->isObjectPointer())
-      ObjectPointer = Children.back().get();
-  }
+  for (DbgVariable *DV : ScopeVariables.lookup(Scope))
+    Children.push_back(constructVariableDIE(TheCU, *DV, *Scope, ObjectPointer));
+
   for (LexicalScope *LS : Scope->getChildren())
     if (std::unique_ptr<DIE> Nested = constructScopeDIE(TheCU, LS))
       Children.push_back(std::move(Nested));
@@ -897,7 +906,7 @@ void DwarfDebug::collectDeadVariables() {
           if (!DV.isVariable())
             continue;
           DbgVariable NewVar(DV, nullptr, this);
-          SPDIE->addChild(SPCU->constructVariableDIE(NewVar, false));
+          SPDIE->addChild(SPCU->constructVariableDIE(NewVar));
         }
       }
     }

lib/CodeGen/AsmPrinter/DwarfUnit.cpp

@@ -1807,14 +1807,15 @@ void DwarfUnit::constructContainingTypeDIEs() {
 
 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
 std::unique_ptr<DIE> DwarfUnit::constructVariableDIE(DbgVariable &DV,
-                                                     bool isScopeAbstract) {
-  auto D = constructVariableDIEImpl(DV, isScopeAbstract);
+                                                     AbstractOrInlined AbsIn) {
+  auto D = constructVariableDIEImpl(DV, AbsIn);
   DV.setDIE(*D);
   return D;
 }
 
-std::unique_ptr<DIE> DwarfUnit::constructVariableDIEImpl(const DbgVariable &DV,
-                                                         bool isScopeAbstract) {
+std::unique_ptr<DIE>
+DwarfUnit::constructVariableDIEImpl(const DbgVariable &DV,
+                                    AbstractOrInlined AbsIn) {
   StringRef Name = DV.getName();
 
   // Define variable debug information entry.
@@ -1830,10 +1831,10 @@ std::unique_ptr<DIE> DwarfUnit::constructVariableDIEImpl(const DbgVariable &DV,
     addType(*VariableDie, DV.getType());
   }
 
-  if (DV.isArtificial())
+  if (AbsIn != AOI_Inlined && DV.isArtificial())
     addFlag(*VariableDie, dwarf::DW_AT_artificial);
 
-  if (isScopeAbstract)
+  if (AbsIn == AOI_Abstract)
     return VariableDie;
 
   // Add variable address.

lib/CodeGen/AsmPrinter/DwarfUnit.h

@@ -61,6 +61,8 @@ public:
   void addRange(RangeSpan Range) { Ranges.push_back(Range); }
 };
 
+enum AbstractOrInlined { AOI_None, AOI_Inlined, AOI_Abstract };
+
 //===----------------------------------------------------------------------===//
 /// Unit - This dwarf writer support class manages information associated
 /// with a source file.
@@ -413,7 +415,7 @@ public:
 
   /// constructVariableDIE - Construct a DIE for the given DbgVariable.
   std::unique_ptr<DIE> constructVariableDIE(DbgVariable &DV,
-                                            bool isScopeAbstract);
+                                            AbstractOrInlined AbsIn = AOI_None);
 
   /// constructSubprogramArguments - Construct function argument DIEs.
   DIE *constructSubprogramArguments(DIE &Buffer, DIArray Args);
@@ -451,7 +453,7 @@ private:
   /// \brief Construct a DIE for the given DbgVariable without initializing the
   /// DbgVariable's DIE reference.
   std::unique_ptr<DIE> constructVariableDIEImpl(const DbgVariable &DV,
-                                                bool isScopeAbstract);
+                                                AbstractOrInlined AbsIn);
 
   /// constructTypeDIE - Construct basic type die from DIBasicType.
   void constructTypeDIE(DIE &Buffer, DIBasicType BTy);

test/DebugInfo/X86/inline-member-function.ll

@@ -18,6 +18,8 @@
 ; CHECK-NEXT: DW_AT_abstract_origin {{.*}}{[[ABSTRACT_ORIGIN:0x[0-9a-e]*]]}
 ; CHECK-NOT: NULL
 ; CHECK-NOT: DW_AT_object_pointer
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NOT: DW_AT_artificial
 ; CHECK: DW_TAG
 
 ; But make sure we emit DW_AT_object_pointer on the declaration.