Add support for DW_TAG_unspecified_parameters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115833 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 29 insertions, 7 deletions

diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index 06a66d5539..3dd659833e 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -199,6 +199,12 @@ bool DIDescriptor::isGlobal() const {
   return isGlobalVariable();
 }
 
+/// isUnspecifiedParmeter - Return true if the specified tab is
+/// DW_TAG_unspecified_parameters.
+bool DIDescriptor::isUnspecifiedParameter() const {
+  return DbgNode && getTag() == dwarf::DW_TAG_unspecified_parameters;
+}
+
 /// isScope - Return true if the specified tag is one of the scope
 /// related tag.
 bool DIDescriptor::isScope() const {
@@ -724,7 +730,14 @@ DISubrange DIFactory::GetOrCreateSubrange(int64_t Lo, int64_t Hi) {
   return DISubrange(MDNode::get(VMContext, &Elts[0], 3));
 }
 
-
+/// CreateUnspecifiedParameter - Create unspeicified type descriptor
+/// for the subroutine type.
+DIDescriptor DIFactory::CreateUnspecifiedParameter() {
+  Value *Elts[] = {
+    GetTagConstant(dwarf::DW_TAG_unspecified_parameters)
+  };
+  return DIDescriptor(MDNode::get(VMContext, &Elts[0], 1));
+}
 
 /// CreateCompileUnit - Create a new descriptor for the specified compile
 /// unit.  Note that this does not unique compile units within the module.
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index ddda184407..b2ae1a24c1 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1042,16 +1042,25 @@ void DwarfDebug::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
     DIDescriptor RTy = Elements.getElement(0);
     addType(&Buffer, DIType(RTy));
 
-    // Add prototype flag.
-    addUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
-
+    bool isPrototyped = true;
     // Add arguments.
     for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
-      DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
       DIDescriptor Ty = Elements.getElement(i);
-      addType(Arg, DIType(Ty));
-      Buffer.addChild(Arg);
+      if (Ty.isUnspecifiedParameter()) {
+        DIE *Arg = new DIE(dwarf::DW_TAG_unspecified_parameters);
+        Buffer.addChild(Arg);
+        isPrototyped = false;
+      } else {
+        DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
+        addType(Arg, DIType(Ty));
+        Buffer.addChild(Arg);
+      }
     }
+    // Add prototype flag.
+    if (isPrototyped)
+      addUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
+
+
   }
     break;
   case dwarf::DW_TAG_structure_type: