From ce38992a307908a3b2b97950a3a2a356ab32410d Mon Sep 17 00:00:00 2001
From: Michael Liao <michael.hliao@gmail.com>
Date: Fri, 29 Mar 2019 03:55:52 +0000
Subject: [PATCH] [Sema] Fix a crash when nonnull checking

Summary:
- If a parameter is used, nonnull checking needs function prototype to
  retrieve the corresponding parameter's attributes. However, at the
  prototype substitution phase when a template is being instantiated,
  expression may be created and checked without a fully specialized
  prototype. Under such a scenario, skip nonnull checking on that
  argument.

Reviewers: rjmccall, tra, yaxunl

Subscribers: javed.absar, kristof.beyls, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D59900

llvm-svn: 357236
---
 clang/lib/Sema/SemaChecking.cpp |  3 +++
 clang/test/SemaCXX/pr30559.cpp  | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 clang/test/SemaCXX/pr30559.cpp

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index df77ab9..024d78b 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -11592,6 +11592,9 @@ void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
       }
 
       if (const auto *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
+        // Skip function template not specialized yet.
+        if (FD->getTemplatedKind() == FunctionDecl::TK_FunctionTemplate)
+          return;
         auto ParamIter = llvm::find(FD->parameters(), PV);
         assert(ParamIter != FD->param_end());
         unsigned ParamNo = std::distance(FD->param_begin(), ParamIter);
diff --git a/clang/test/SemaCXX/pr30559.cpp b/clang/test/SemaCXX/pr30559.cpp
new file mode 100644
index 0000000..bcd2385
--- /dev/null
+++ b/clang/test/SemaCXX/pr30559.cpp
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only %s
+
+template < bool, class > struct A {};
+template < class, int > void f () {};
+template < class T, int >
+decltype (f < T, 1 >) f (T t, typename A < t == 0, int >::type) {};
+
+struct B {};
+
+int main ()
+{
+  f < B, 0 >;
+  return 0;
+}
+
+template <typename T>
+auto foo(T x) -> decltype((x == nullptr), *x) {
+  return *x;
+}
+
+void bar() {
+  foo(new int);
+}
-- 
2.7.4