Recommit, with fixes:

    Add some support for dealing with an object pointer on arguments.

    Part of rdar://9797999

which now supports adding the object pointer attribute to the
subprogram as it should.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163754 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 24 insertions, 1 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 0007f13e91..58e65c06d4 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -1109,6 +1109,9 @@ DIE *CompileUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
         addType(Arg, ATy);
         if (ATy.isArtificial())
           addFlag(Arg, dwarf::DW_AT_artificial);
+        if (ATy.isObjectPointer())
+          addDIEEntry(SPDie, dwarf::DW_AT_object_pointer, dwarf::DW_FORM_ref4,
+                      Arg);
         SPDie->addChild(Arg);
       }
   }
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 0fface1e3b..52fae53fe8 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -330,6 +330,9 @@ DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
           SPCU->addType(Arg, ATy);
           if (ATy.isArtificial())
             SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
+          if (ATy.isObjectPointer())
+            SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer, dwarf::DW_FORM_ref4,
+                              Arg);
           SPDie->addChild(Arg);
         }
       DIE *SPDeclDie = SPDie;
@@ -496,14 +499,17 @@ DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
     return NULL;
 
   SmallVector<DIE *, 8> Children;
+  DIE *ObjectPointer = NULL;
 
   // Collect arguments for current function.
   if (LScopes.isCurrentFunctionScope(Scope))
     for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
       if (DbgVariable *ArgDV = CurrentFnArguments[i])
         if (DIE *Arg = 
-            TheCU->constructVariableDIE(ArgDV, Scope->isAbstractScope()))
+            TheCU->constructVariableDIE(ArgDV, Scope->isAbstractScope())) {
           Children.push_back(Arg);
+          if (ArgDV->isObjectPointer()) ObjectPointer = Arg;
+        }
 
   // Collect lexical scope children first.
   const SmallVector<DbgVariable *, 8> &Variables = ScopeVariables.lookup(Scope);
@@ -544,6 +550,10 @@ DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
          E = Children.end(); I != E; ++I)
     ScopeDIE->addChild(*I);
 
+  if (DS.isSubprogram() && ObjectPointer != NULL)
+    TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer,
+                       dwarf::DW_FORM_ref4, ObjectPointer);
+
   if (DS.isSubprogram())
     TheCU->addPubTypes(DISubprogram(DS));
 
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index d662eadab0..d5ae4687df 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -164,6 +164,16 @@ public:
       return true;
     return false;
   }
+
+  bool isObjectPointer()             const {
+    if (Var.isObjectPointer())
+      return true;
+    if (Var.getTag() == dwarf::DW_TAG_arg_variable
+        && getType().isObjectPointer())
+      return true;
+    return false;
+  }
+  
   bool variableHasComplexAddress()   const {
     assert(Var.Verify() && "Invalid complex DbgVariable!");
     return Var.hasComplexAddress();