https://github.com/hazohelet updated https://github.com/llvm/llvm-project/pull/67817
>From acb5d8286335f85732ede8d33ac2529e13a3f61b Mon Sep 17 00:00:00 2001 From: Takuya Shimizu <shimizu2...@gmail.com> Date: Fri, 29 Sep 2023 23:49:11 +0900 Subject: [PATCH 1/3] [clang][ExprConst] Fix crash on uninitialized array subobject https://reviews.llvm.org/D146358 was assuming that all subobjects have their own name (`SubobjectDecl`), but it was not true for array elements. Fixes https://github.com/llvm/llvm-project/issues/67317 --- clang/include/clang/Basic/DiagnosticASTKinds.td | 2 +- clang/lib/AST/ExprConstant.cpp | 13 +++++++++---- clang/lib/AST/Interp/Interp.cpp | 2 +- clang/test/SemaCXX/eval-crashes.cpp | 7 +++++++ 4 files changed, 18 insertions(+), 6 deletions(-) diff --git a/clang/include/clang/Basic/DiagnosticASTKinds.td b/clang/include/clang/Basic/DiagnosticASTKinds.td index 0019553233fdef6..cebcefff53d18ae 100644 --- a/clang/include/clang/Basic/DiagnosticASTKinds.td +++ b/clang/include/clang/Basic/DiagnosticASTKinds.td @@ -69,7 +69,7 @@ def note_consteval_address_accessible : Note< "%select{pointer|reference}0 to a consteval declaration " "is not a constant expression">; def note_constexpr_uninitialized : Note< - "subobject %0 is not initialized">; + "subobject %select{of type |}0%1 is not initialized">; def note_constexpr_uninitialized_base : Note< "constructor of base class %0 is not called">; def note_constexpr_static_local : Note< diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp index e5539dedec02a4b..bfa2837fe746da3 100644 --- a/clang/lib/AST/ExprConstant.cpp +++ b/clang/lib/AST/ExprConstant.cpp @@ -2411,10 +2411,15 @@ static bool CheckEvaluationResult(CheckEvaluationResultKind CERK, const FieldDecl *SubobjectDecl, CheckedTemporaries &CheckedTemps) { if (!Value.hasValue()) { - assert(SubobjectDecl && "SubobjectDecl shall be non-null"); - Info.FFDiag(DiagLoc, diag::note_constexpr_uninitialized) << SubobjectDecl; - Info.Note(SubobjectDecl->getLocation(), - diag::note_constexpr_subobject_declared_here); + if (SubobjectDecl) { + Info.FFDiag(DiagLoc, diag::note_constexpr_uninitialized) + << true << SubobjectDecl; + Info.Note(SubobjectDecl->getLocation(), + diag::note_constexpr_subobject_declared_here); + } else { + // FIXME: We should add a test to check the output of this case. + Info.FFDiag(DiagLoc, diag::note_constexpr_uninitialized) << false << Type; + } return false; } diff --git a/clang/lib/AST/Interp/Interp.cpp b/clang/lib/AST/Interp/Interp.cpp index a4d6844ebe61722..51bf8f9197ae134 100644 --- a/clang/lib/AST/Interp/Interp.cpp +++ b/clang/lib/AST/Interp/Interp.cpp @@ -404,7 +404,7 @@ bool CheckPure(InterpState &S, CodePtr OpPC, const CXXMethodDecl *MD) { static void DiagnoseUninitializedSubobject(InterpState &S, const SourceInfo &SI, const FieldDecl *SubObjDecl) { assert(SubObjDecl && "Subobject declaration does not exist"); - S.FFDiag(SI, diag::note_constexpr_uninitialized) << SubObjDecl; + S.FFDiag(SI, diag::note_constexpr_uninitialized) << true << SubObjDecl; S.Note(SubObjDecl->getLocation(), diag::note_constexpr_subobject_declared_here); } diff --git a/clang/test/SemaCXX/eval-crashes.cpp b/clang/test/SemaCXX/eval-crashes.cpp index 3e59ad31c559da8..ac04b113f99b7aa 100644 --- a/clang/test/SemaCXX/eval-crashes.cpp +++ b/clang/test/SemaCXX/eval-crashes.cpp @@ -54,3 +54,10 @@ namespace pr33140_10 { int a(const int &n = 0); bool b() { return a() == a(); } } + +namespace GH67317 { +struct array { + int (&data)[2]; + array() : data(*new int[1][2]) {} +}; +} >From cd6fd87b28ffc94a5e45bcc763beec73d6d13e20 Mon Sep 17 00:00:00 2001 From: Takuya Shimizu <shimizu2...@gmail.com> Date: Sat, 30 Sep 2023 00:03:29 +0900 Subject: [PATCH 2/3] Add release note --- clang/docs/ReleaseNotes.rst | 2 ++ 1 file changed, 2 insertions(+) diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 52d5b9a3f66d155..12204d0cdc0bc45 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -397,6 +397,8 @@ Bug Fixes in This Version operator in C. No longer issuing a confusing diagnostic along the lines of "incompatible operand types ('foo' and 'foo')" with extensions such as matrix types. Fixes (`#69008 <https://github.com/llvm/llvm-project/issues/69008>`_) +- Fix crash from constexpr evaluator evaluating uninitialized arrays as rvalue. + Fixes (`#67317 <https://github.com/llvm/llvm-project/issues/67317>`_) Bug Fixes to Compiler Builtins ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >From d49fbc1cb7e596f0c8210739410c24950d46b99e Mon Sep 17 00:00:00 2001 From: Takuya Shimizu <shimizu2...@gmail.com> Date: Mon, 16 Oct 2023 13:43:02 +0900 Subject: [PATCH 3/3] Add test to test the fallbacked output --- clang/lib/AST/ExprConstant.cpp | 1 - clang/test/SemaCXX/constant-expression-cxx2a.cpp | 6 ++++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp index bfa2837fe746da3..6634f46a5b801ae 100644 --- a/clang/lib/AST/ExprConstant.cpp +++ b/clang/lib/AST/ExprConstant.cpp @@ -2417,7 +2417,6 @@ static bool CheckEvaluationResult(CheckEvaluationResultKind CERK, Info.Note(SubobjectDecl->getLocation(), diag::note_constexpr_subobject_declared_here); } else { - // FIXME: We should add a test to check the output of this case. Info.FFDiag(DiagLoc, diag::note_constexpr_uninitialized) << false << Type; } return false; diff --git a/clang/test/SemaCXX/constant-expression-cxx2a.cpp b/clang/test/SemaCXX/constant-expression-cxx2a.cpp index 09f17d5b3894998..e4d97dcb73562d6 100644 --- a/clang/test/SemaCXX/constant-expression-cxx2a.cpp +++ b/clang/test/SemaCXX/constant-expression-cxx2a.cpp @@ -1492,3 +1492,9 @@ class B{ class D : B{}; // expected-error {{deleted function '~D' cannot override a non-deleted function}} // expected-note@-1 {{destructor of 'D' is implicitly deleted because base class 'B' has an inaccessible destructor}} } + +namespace GH67317 { + constexpr unsigned char a = // expected-error {{constexpr variable 'a' must be initialized by a constant expression}} \ + // expected-note {{subobject of type 'const unsigned char' is not initialized}} + __builtin_bit_cast(unsigned char, *new char[3][1]); +}; _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
