[PATCH] D49862: [clang-tidy] Fix a crash in fuchsia-multiple-inheritance

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov created this revision.
ilya-biryukov added reviewers: juliehockett, ioeric, hokein, aaron.ballman.
Herald added a subscriber: xazax.hun.

See the test case for a repro.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D49862

Files:
  clang-tidy/fuchsia/MultipleInheritanceCheck.cpp
  test/clang-tidy/fuchsia-multiple-inheritance-crash.cpp


Index: test/clang-tidy/fuchsia-multiple-inheritance-crash.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/fuchsia-multiple-inheritance-crash.cpp
@@ -0,0 +1,10 @@
+// RUN: clang-tidy -checks='fuchsia-multiple-inheritance' %s --
+template <class T>
+struct X : T {
+  X();
+};
+
+int test() {
+  auto foo = []() {};
+  X<decltype(foo)>();
+}
Index: clang-tidy/fuchsia/MultipleInheritanceCheck.cpp
===================================================================
--- clang-tidy/fuchsia/MultipleInheritanceCheck.cpp
+++ clang-tidy/fuchsia/MultipleInheritanceCheck.cpp
@@ -30,6 +30,7 @@
 // previously.
 void MultipleInheritanceCheck::addNodeToInterfaceMap(const CXXRecordDecl *Node,
                                                      bool isInterface) {
+  assert(Node->getIdentifier());
   StringRef Name = Node->getIdentifier()->getName();
   InterfaceMap.insert(std::make_pair(Name, isInterface));
 }
@@ -39,6 +40,7 @@
 // interface status for the current node is not yet known.
 bool MultipleInheritanceCheck::getInterfaceStatus(const CXXRecordDecl *Node,
                                                   bool &isInterface) const {
+  assert(Node->getIdentifier());
   StringRef Name = Node->getIdentifier()->getName();
   llvm::StringMapConstIterator<bool> Pair = InterfaceMap.find(Name);
   if (Pair == InterfaceMap.end())
@@ -59,6 +61,9 @@
 }
 
 bool MultipleInheritanceCheck::isInterface(const CXXRecordDecl *Node) {
+  if (!Node->getIdentifier())
+    return false;
+
   // Short circuit the lookup if we have analyzed this record before.
   bool PreviousIsInterfaceResult;
   if (getInterfaceStatus(Node, PreviousIsInterfaceResult))


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