[clang] 1fa3c85 - [Clang] prevent recovery call expression from proceeding with explicit attributes and undeclared templates (#107786)
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Thu Oct 10 01:02:25 PDT 2024
Author: Oleksandr T.
Date: 2024-10-10T10:02:21+02:00
New Revision: 1fa3c857f011bfbca788d481680229accbf6e350
URL: https://github.com/llvm/llvm-project/commit/1fa3c857f011bfbca788d481680229accbf6e350
DIFF: https://github.com/llvm/llvm-project/commit/1fa3c857f011bfbca788d481680229accbf6e350.diff
LOG: [Clang] prevent recovery call expression from proceeding with explicit attributes and undeclared templates (#107786)
Fixes #107047
Fixes #49093
Added:
clang/test/SemaTemplate/recovery-crash-cxx20.cpp
Modified:
clang/docs/ReleaseNotes.rst
clang/lib/Sema/SemaExpr.cpp
Removed:
################################################################################
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index caca083409aa2c..c0019cfe4658d7 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -489,6 +489,8 @@ Bug Fixes to C++ Support
- Clang now instantiates the correct lambda call operator when a lambda's class type is
merged across modules. (#GH110401)
- Fix a crash when parsing a pseudo destructor involving an invalid type. (#GH111460)
+- Fixed an assertion failure when invoking recovery call expressions with explicit attributes
+ and undeclared templates. (#GH107047, #GH49093)
Bug Fixes to AST Handling
^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 7401e4cc8f0928..e2141e03ca4230 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -2470,7 +2470,15 @@ bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
LookupCtx ? LookupCtx : (SS.isEmpty() ? CurContext : nullptr);
while (DC) {
if (isa<CXXRecordDecl>(DC)) {
- LookupQualifiedName(R, DC);
+ if (ExplicitTemplateArgs) {
+ if (LookupTemplateName(
+ R, S, SS, Context.getRecordType(cast<CXXRecordDecl>(DC)),
+ /*EnteringContext*/ false, TemplateNameIsRequired,
+ /*RequiredTemplateKind*/ nullptr, /*AllowTypoCorrection*/ true))
+ return true;
+ } else {
+ LookupQualifiedName(R, DC);
+ }
if (!R.empty()) {
// Don't give errors about ambiguities in this lookup.
diff --git a/clang/test/SemaTemplate/recovery-crash-cxx20.cpp b/clang/test/SemaTemplate/recovery-crash-cxx20.cpp
new file mode 100644
index 00000000000000..e092ab802e459e
--- /dev/null
+++ b/clang/test/SemaTemplate/recovery-crash-cxx20.cpp
@@ -0,0 +1,32 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 %s
+
+namespace GH49093 {
+ class B {
+ public:
+ static int a() { return 0; } // expected-note {{declared as a non-template here}}
+ decltype(a< 0 >(0)) test; // expected-error {{'a' does not refer to a template}}
+ };
+
+ struct C {
+ static int a() { return 0; } // expected-note {{declared as a non-template here}}
+ decltype(a < 0 > (0)) test; // expected-error {{'a' does not refer to a template}}
+ };
+
+ void test_is_bool(bool t) {}
+ void test_is_bool(int t) {}
+
+ int main() {
+ B b;
+ test_is_bool(b.test);
+
+ C c;
+ test_is_bool(c.test);
+ }
+}
+
+namespace GH107047 {
+ struct A {
+ static constexpr auto test() { return 1; } // expected-note {{declared as a non-template here}}
+ static constexpr int s = test< 1 >(); // expected-error {{'test' does not refer to a template}}
+ };
+}
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