[PATCH] Make sure !empty() before calling front().

[Chaoren Lin]

Hi howard.hinnant,

http://reviews.llvm.org/D9954

Files:
  src/cxa_demangle.cpp

Index: src/cxa_demangle.cpp
===================================================================
--- src/cxa_demangle.cpp
+++ src/cxa_demangle.cpp
@@ -1671,7 +1671,7 @@
                 auto func = std::move(db.names.back());
                 db.names.pop_back();
                 auto class_type = std::move(db.names.back());
-                if (func.second.front() == '(')
+                if (!func.second.empty() && func.second.front() == '(')
                 {
                     db.names.back().first = std::move(func.first) + "(" + class_type.move_full() + "::*";
                     db.names.back().second = ")" + std::move(func.second);
@@ -2018,7 +2018,8 @@
                                     db.names[k].first += " (";
                                     db.names[k].second.insert(0, ")");
                                 }
-                                else if (db.names[k].second.front() == '(')
+                                else if (!db.names[k].second.empty() &&
+                                          db.names[k].second.front() == '(')
                                 {
                                     db.names[k].first += "(";
                                     db.names[k].second.insert(0, ")");
@@ -2045,7 +2046,8 @@
                                     db.names[k].first += " (";
                                     db.names[k].second.insert(0, ")");
                                 }
-                                else if (db.names[k].second.front() == '(')
+                                else if (!db.names[k].second.empty() &&
+                                          db.names[k].second.front() == '(')
                                 {
                                     db.names[k].first += "(";
                                     db.names[k].second.insert(0, ")");
@@ -2079,7 +2081,8 @@
                                     db.names[k].first += " (";
                                     db.names[k].second.insert(0, ")");
                                 }
-                                else if (db.names[k].second.front() == '(')
+                                else if (!db.names[k].second.empty() &&
+                                          db.names[k].second.front() == '(')
                                 {
                                     db.names[k].first += "(";
                                     db.names[k].second.insert(0, ")");

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