Print tag name for MDNodes that are used to encode debug info.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83160 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/VMCore/AsmWriter.cpp b/lib/VMCore/AsmWriter.cpp
index 60c5b3e99b638b875cebf158fa9eaedf825c1ddc..fbd62dd0728e311f767d1f54e22ed0e8dbeb2be3 100644 (file)
--- a/lib/VMCore/AsmWriter.cpp
+++ b/lib/VMCore/AsmWriter.cpp
@@ -32,6 +32,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/CFG.h"
+#include "llvm/Support/Dwarf.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/FormattedStream.h"
@@ -869,6 +870,30 @@ static const char *getPredicateText(unsigned predicate) {
   return pred;
 }
 
+static void WriteMDNodeComment(const MDNode *Node,
+                              formatted_raw_ostream &Out) {
+  if (Node->getNumElements() < 1)
+    return;
+  ConstantInt *CI = dyn_cast<ConstantInt>(Node->getElement(0));
+  if (!CI) return;
+  unsigned Val = CI->getZExtValue();
+  unsigned Tag = Val & ~LLVMDebugVersionMask;
+  if (Val >= LLVMDebugVersion) {
+    if (Tag == dwarf::DW_TAG_auto_variable)
+      Out << "; [ DW_TAG_auto_variable ]";
+    else if (Tag == dwarf::DW_TAG_arg_variable)
+      Out << "; [ DW_TAG_arg_variable ]";
+    else if (Tag == dwarf::DW_TAG_return_variable)
+      Out << "; [ DW_TAG_return_variable ]";
+    else if (Tag == dwarf::DW_TAG_vector_type)
+      Out << "; [ DW_TAG_vector_type ]";
+    else if (Tag == dwarf::DW_TAG_user_base)
+      Out << "; [ DW_TAG_user_base ]";
+    else
+      Out << "; [" << dwarf::TagString(Tag) << " ]";
+  }
+}
+
 static void WriteMDNodes(formatted_raw_ostream &Out, TypePrinting &TypePrinter,
                          SlotTracker &Machine) {
   SmallVector<const MDNode *, 16> Nodes;
@@ -898,7 +923,10 @@ static void WriteMDNodes(formatted_raw_ostream &Out, TypePrinting &TypePrinter,
       if (++NI != NE)
         Out << ", ";
     }
-    Out << "}\n";
+
+    Out << "}";
+    WriteMDNodeComment(Node, Out);
+    Out << "\n";
   }
 }