liberty seg fault when missing template and axis values

Signed-off-by: James Cherry <cherry@parallaxsw.com>

liberty/LibertyReader.cc

@@ -4658,9 +4658,9 @@ LibertyReader::makeTable(LibertyAttr *attr,
                          float scale)
 {
   if (attr->isComplex()) {
-    makeTableAxis(0);
-    makeTableAxis(1);
-    makeTableAxis(2);
+    makeTableAxis(0, attr);
+    makeTableAxis(1, attr);
+    makeTableAxis(2, attr);
     if (axis_[0] && axis_[1] && axis_[2]) {
       // 3D table
       // Column index1*size(index2) + index2
@@ -4685,7 +4685,7 @@ LibertyReader::makeTable(LibertyAttr *attr,
       delete table;
       table_ = make_shared<Table1>(values, axis_[0]);
     }
-    else {
+    else if (axis_[0] == nullptr && axis_[1] == nullptr && axis_[2] == nullptr) {
       // scalar
       FloatTable *table = makeFloatTable(attr, 1, 1, scale);
       float value = (*(*table)[0])[0];
@@ -4747,7 +4747,8 @@ LibertyReader::makeFloatTable(LibertyAttr *attr,
 }
 
 void
-LibertyReader::makeTableAxis(int index)
+LibertyReader::makeTableAxis(int index,
+                             LibertyAttr *attr)
 {
   if (axis_values_[index]) {
     TableAxisVariable var = axis_[index]->variable();
@@ -4757,6 +4758,11 @@ LibertyReader::makeTableAxis(int index)
     scaleFloats(values, scale);
     axis_[index] = make_shared<TableAxis>(var, values);
   }
+  else if (axis_[index] && axis_[index]->values() == nullptr) {
+    libWarn(1344, attr, "Table axis and template missing values.");
+    axis_[index] = nullptr;
+    axis_values_[index] = nullptr;
+  }
 }
 
 ////////////////////////////////////////////////////////////////

liberty/LibertyReaderPvt.hh

@@ -524,7 +524,8 @@ protected:
 			 LibraryAttrVisitor visitor);
   void parseNames(const char *name_str);
   void clearAxisValues();
-  void makeTableAxis(int index);
+  void makeTableAxis(int index,
+                     LibertyAttr *attr);
 
   StringSeq *parseNameList(const char *name_list);
   StdStringSeq parseTokenList(const char *token_str,