[clang] [clang][Sema] Add checks for validity of default ctor's class (PR #78898)
Vlad Serebrennikov via cfe-commits
cfe-commits at lists.llvm.org
Thu Jan 25 21:51:24 PST 2024
https://github.com/Endilll updated https://github.com/llvm/llvm-project/pull/78898
>From b99a75a8756a7841657fc78ffbd40f780a412f2b Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
Date: Sun, 21 Jan 2024 16:26:29 +0300
Subject: [PATCH 1/2] [clang][Sema] Add checks for validity of default ctor's
class
Fixes #10518
Fixes #67914
Fixes #78388
Also addresses the second example in #49103
This patch is based on suggestion from @cor3ntin in https://github.com/llvm/llvm-project/issues/67914#issuecomment-1896011898
---
clang/docs/ReleaseNotes.rst | 5 +++++
clang/lib/Sema/SemaDeclCXX.cpp | 7 +++++++
2 files changed, 12 insertions(+)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 8bb26fcae18d6b6..5971bda21a5e25a 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1013,6 +1013,11 @@ Bug Fixes to C++ Support
- Fix a false-positive ODR violation for different definitions for `std::align_val_t`.
Fixes (`#76638 <https://github.com/llvm/llvm-project/issues/76638>`_)
+- Fix crash when calling the constructor of an invalid class.
+ Fixes (`#10518 <https://github.com/llvm/llvm-project/issues/10518>`_),
+ (`#67914 <https://github.com/llvm/llvm-project/issues/10518>`_),
+ and (`#78388 <https://github.com/llvm/llvm-project/issues/78388>`_)
+
- Remove recorded `#pragma once` state for headers included in named modules.
Fixes (`#77995 <https://github.com/llvm/llvm-project/issues/77995>`_)
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index df5bd55e7c28368..634af573480b45e 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -5990,6 +5990,10 @@ void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) {
if (CXXConstructorDecl *Constructor
= dyn_cast<CXXConstructorDecl>(CDtorDecl)) {
+ if (CXXRecordDecl *ClassDecl = Constructor->getParent();
+ !ClassDecl || ClassDecl->isInvalidDecl()) {
+ return;
+ }
SetCtorInitializers(Constructor, /*AnyErrors=*/false);
DiagnoseUninitializedFields(*this, Constructor);
}
@@ -14030,6 +14034,9 @@ void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation,
CXXRecordDecl *ClassDecl = Constructor->getParent();
assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor");
+ if (ClassDecl->isInvalidDecl()) {
+ return;
+ }
SynthesizedFunctionScope Scope(*this, Constructor);
>From 826dc7aa7cad2c2d2eaa02b30c814e63abf222b6 Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
Date: Fri, 26 Jan 2024 08:50:52 +0300
Subject: [PATCH 2/2] Add regression tests for fixed crashes
---
clang/test/SemaCXX/crash-GH10518.cpp | 22 ++++++++
clang/test/SemaCXX/crash-GH49103-2.cpp | 13 +++++
clang/test/SemaCXX/crash-GH67914.cpp | 78 ++++++++++++++++++++++++++
clang/test/SemaCXX/crash-GH78388.cpp | 17 ++++++
4 files changed, 130 insertions(+)
create mode 100644 clang/test/SemaCXX/crash-GH10518.cpp
create mode 100644 clang/test/SemaCXX/crash-GH49103-2.cpp
create mode 100644 clang/test/SemaCXX/crash-GH67914.cpp
create mode 100644 clang/test/SemaCXX/crash-GH78388.cpp
diff --git a/clang/test/SemaCXX/crash-GH10518.cpp b/clang/test/SemaCXX/crash-GH10518.cpp
new file mode 100644
index 000000000000000..6c5f80afd3cf8b0
--- /dev/null
+++ b/clang/test/SemaCXX/crash-GH10518.cpp
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -verify -std=c++98 %s
+// RUN: %clang_cc1 -verify -std=c++11 %s
+// RUN: %clang_cc1 -verify -std=c++14 %s
+// RUN: %clang_cc1 -verify -std=c++17 %s
+// RUN: %clang_cc1 -verify -std=c++20 %s
+// RUN: %clang_cc1 -verify -std=c++23 %s
+// RUN: %clang_cc1 -verify -std=c++2c %s
+
+// https://github.com/llvm/llvm-project/issues/10518
+
+template <class T>
+class A : public T {
+};
+
+template <class T>
+class B : public A<T> {
+};
+
+template <class T>
+class B<int> : public A<T> { // expected-error 0-1 {{}}
+ B(T *t) {}
+};
diff --git a/clang/test/SemaCXX/crash-GH49103-2.cpp b/clang/test/SemaCXX/crash-GH49103-2.cpp
new file mode 100644
index 000000000000000..4c17a054c73afc3
--- /dev/null
+++ b/clang/test/SemaCXX/crash-GH49103-2.cpp
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -verify -std=c++98 %s
+// RUN: %clang_cc1 -verify -std=c++11 %s
+// RUN: %clang_cc1 -verify -std=c++14 %s
+// RUN: %clang_cc1 -verify -std=c++17 %s
+// RUN: %clang_cc1 -verify -std=c++20 %s
+// RUN: %clang_cc1 -verify -std=c++23 %s
+// RUN: %clang_cc1 -verify -std=c++2c %s
+
+// https://github.com/llvm/llvm-project/issues/49103
+
+template<class> struct A; // expected-note 0+ {{}}
+struct S : __make_integer_seq<A, int, 42> { }; // expected-error 0+ {{}}
+S s;
diff --git a/clang/test/SemaCXX/crash-GH67914.cpp b/clang/test/SemaCXX/crash-GH67914.cpp
new file mode 100644
index 000000000000000..fbaeac636c0db1c
--- /dev/null
+++ b/clang/test/SemaCXX/crash-GH67914.cpp
@@ -0,0 +1,78 @@
+// RUN: %clang_cc1 -verify -std=c++98 %s
+// RUN: %clang_cc1 -verify -std=c++11 %s
+// RUN: %clang_cc1 -verify -std=c++14 %s
+// RUN: %clang_cc1 -verify -std=c++17 %s
+// RUN: %clang_cc1 -verify -std=c++20 %s
+// RUN: %clang_cc1 -verify -std=c++23 %s
+// RUN: %clang_cc1 -verify -std=c++2c %s
+
+// https://github.com/llvm/llvm-project/issues/67914
+
+template < typename, int >
+struct Mask;
+
+template < int, class >
+struct conditional {
+ using type = Mask< int, 16 >; // expected-warning 0+ {{}}
+};
+
+template < class _Then >
+struct conditional< 0, _Then > {
+ using type = _Then; // expected-warning 0+ {{}}
+};
+
+template < int _Bp, class, class _Then >
+using conditional_t = typename conditional< _Bp, _Then >::type; // expected-warning 0+ {{}}
+
+template < typename, int >
+struct Array;
+
+template < typename, int, bool, typename >
+struct StaticArrayImpl;
+
+template < typename Value_, int Size_ >
+struct Mask : StaticArrayImpl< Value_, Size_, 1, Mask< Value_, Size_ > > { // expected-note 0+ {{}}
+ template < typename T1 >
+ Mask(T1) {} // expected-note 0+ {{}}
+};
+
+template < typename T >
+void load(typename T::MaskType mask) {
+ T::load_(mask); // expected-note 0+ {{}}
+}
+
+template < typename Value_, int IsMask_, typename Derived_ >
+struct StaticArrayImpl< Value_, 32, IsMask_, Derived_ > {
+ using Array1 = conditional_t< IsMask_, void, Array< Value_, 16 > >; // expected-warning 0+ {{}}
+
+ template < typename Mask >
+ static Derived_ load_(Mask mask) {
+ return Derived_{load< Array1 >(mask.a1), Mask{}}; // expected-error 0+ {{}}
+ }
+
+ Array1 a1;
+};
+
+template < typename Derived_ >
+struct KMaskBase;
+
+template < typename Derived_ >
+struct StaticArrayImpl< float, 16, 0, Derived_ > {
+ template < typename Mask >
+ static Derived_ load_(Mask mask);
+};
+
+template < typename Derived_ >
+struct StaticArrayImpl< float, 16, 1, Mask< float, 16 > > : KMaskBase< Derived_ > {}; // expected-error 0+ {{}}
+
+template < typename Derived_ >
+struct StaticArrayImpl< int, 16, 1, Derived_ > {};
+
+template < typename Value_, int Size_ >
+struct Array : StaticArrayImpl< Value_, Size_, 0, Array< Value_, Size_ > > {
+ using MaskType = Mask< Value_, Size_ >; // expected-warning 0+ {{}}
+};
+
+void test11_load_masked() {
+ load< Array< float, 32 > >{} == 0; // expected-error 0+ {{}} expected-warning 0+ {{}} expected-note 0+ {{}}
+}
diff --git a/clang/test/SemaCXX/crash-GH78388.cpp b/clang/test/SemaCXX/crash-GH78388.cpp
new file mode 100644
index 000000000000000..cdec4d5bedef4ab
--- /dev/null
+++ b/clang/test/SemaCXX/crash-GH78388.cpp
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -verify -std=c++98 %s
+// RUN: %clang_cc1 -verify -std=c++11 %s
+// RUN: %clang_cc1 -verify -std=c++14 %s
+// RUN: %clang_cc1 -verify -std=c++17 %s
+// RUN: %clang_cc1 -verify -std=c++20 %s
+// RUN: %clang_cc1 -verify -std=c++23 %s
+// RUN: %clang_cc1 -verify -std=c++2c %s
+
+// https://github.com/llvm/llvm-project/issues/78388
+
+typedef mbstate_t; // expected-error 0+ {{}} expected-note 0+ {{}}
+ template < typename , typename , typename >
+ class a // expected-error 0+ {{}}
+ class b { // expected-error 0+ {{}}
+ namespace { // expected-note 0+ {{}} expected-note 0+ {{}}
+ template < typename c > b::operator=() { // expected-error 0+ {{}} expected-note 0+ {{}}
+ struct :a< c, char, stdmbstate_t > d // expected-error 0+ {{}} expected-warning 0+ {{}}
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