Author: aaronballman
Date: Sat Sep 7 13:14:09 2019
New Revision: 371320
URL: http://llvm.org/viewvc/llvm-project?rev=371320&view=rev
Log:
Fixes an assertion while instantiating a template with an incomplete
typo-corrected type.
Fixes PR35682. When a template in instantiated with an incomplete typo
corrected type an assertion can trigger if the -ferror-limit is used to reduce
the number of errors.
Patch by Mark de Wever.
Added:
cfe/trunk/test/SemaTemplate/instantiate-incomplete-typo-suggested-error-limit.cpp
Modified:
cfe/trunk/lib/Sema/SemaTemplate.cpp
Modified: cfe/trunk/lib/Sema/SemaTemplate.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaTemplate.cpp?rev=371320&r1=371319&r2=371320&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaTemplate.cpp (original)
+++ cfe/trunk/lib/Sema/SemaTemplate.cpp Sat Sep 7 13:14:09 2019
@@ -735,9 +735,13 @@ Sema::BuildDependentDeclRefExpr(const CX
SourceLocation TemplateKWLoc,
const DeclarationNameInfo &NameInfo,
const TemplateArgumentListInfo *TemplateArgs) {
+ // DependentScopeDeclRefExpr::Create requires a valid QualifierLoc
+ NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
+ if (!QualifierLoc)
+ return ExprError();
+
return DependentScopeDeclRefExpr::Create(
- Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
- TemplateArgs);
+ Context, QualifierLoc, TemplateKWLoc, NameInfo, TemplateArgs);
}
Added:
cfe/trunk/test/SemaTemplate/instantiate-incomplete-typo-suggested-error-limit.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaTemplate/instantiate-incomplete-typo-suggested-error-limit.cpp?rev=371320&view=auto
==============================================================================
---
cfe/trunk/test/SemaTemplate/instantiate-incomplete-typo-suggested-error-limit.cpp
(added)
+++
cfe/trunk/test/SemaTemplate/instantiate-incomplete-typo-suggested-error-limit.cpp
Sat Sep 7 13:14:09 2019
@@ -0,0 +1,60 @@
+// RUN: not %clang -fsyntax-only -std=c++11 -ferror-limit=1 %s 2>&1 |
FileCheck %s
+
+// Test case for PR35682.
+// The issue be caused by the typo correction that changes String to the
+// incomplete type string. The example is based on the std::pair code and
+// reduced to a minimal test case. When using std::pair the issue can only be
+// reproduced when using the -stdlib=libc++ compiler option.
+
+template <class T> class allocator;
+
+template <class charT> struct char_traits;
+
+template <class CharT, class Traits = char_traits<CharT>,
+ class Allocator = allocator<CharT>>
+class basic_string;
+typedef basic_string<char, char_traits<char>, allocator<char>> string;
+
+template <bool, class Tp = void> struct enable_if {};
+template <class Tp> struct enable_if<true, Tp> { typedef Tp type; };
+
+template <class Tp, Tp v> struct integral_constant {
+ static constexpr const Tp value = v;
+ typedef Tp value_type;
+ typedef integral_constant type;
+
+ constexpr operator value_type() const noexcept { return value; }
+ constexpr value_type operator()() const noexcept { return value; }
+};
+
+template <class Tp, Tp v> constexpr const Tp integral_constant<Tp, v>::value;
+
+using true_type = integral_constant<bool, true>;
+using false_type = integral_constant<bool, false>;
+
+template <class Tp, class Up> struct is_same : public false_type {};
+template <class Tp> struct is_same<Tp, Tp> : public true_type {};
+
+template <class T> struct single {
+ typedef T first_type;
+
+ T first;
+
+ struct CheckArgs {
+ template <class U1> static constexpr bool enable_implicit() {
+ return is_same<first_type, U1>::value;
+ }
+ };
+
+ template <class U1,
+ typename enable_if<CheckArgs::template enable_implicit<U1>(),
+ bool>::type = false>
+ single(U1 &&u1);
+};
+
+using SetKeyType = String;
+single<SetKeyType> v;
+
+// CHECK: error: unknown type name 'String'; did you mean 'string'?
+// CHECK: fatal error: too many errors emitted, stopping now [-ferror-limit=]
+// CHECK-NOT: Assertion{{.*}}failed
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