https://github.com/tgs-sc updated
https://github.com/llvm/llvm-project/pull/154123
>From 407331b05499cdc1f232cc9e7e3990b38a3923b5 Mon Sep 17 00:00:00 2001
From: Timur Golubovich <timur.golubov...@syntacore.com>
Date: Mon, 8 Sep 2025 14:43:50 +0300
Subject: [PATCH] [lldb][DWARFASTParserClang] Added a check for the
specialization existence
While debugging an application with incorrect dwarf information, where
DW_TAG_template_value_parameter was lost, I found that lldb does not
check that the corresponding specialization exists. As a result, at the
stage when ASTImporter works, the type is completed in such a way that
it inherits from itself. And during the calculation of layout, an
infinite recursion occurs. To catch this error, I added a corresponding check
at the stage of restoring the type from dwarf information.
---
.../SymbolFile/DWARF/DWARFASTParserClang.cpp | 12 +
.../TypeSystem/Clang/TypeSystemClang.cpp | 8 +
.../unittests/SymbolFile/DWARF/CMakeLists.txt | 3 +-
.../DWARF/DWARFASTParserClangTests.cpp | 34 +
.../Inputs/DW_AT_spec_decl_exists-test.yaml | 677 ++++++++++++++++++
5 files changed, 733 insertions(+), 1 deletion(-)
create mode 100644
lldb/unittests/SymbolFile/DWARF/Inputs/DW_AT_spec_decl_exists-test.yaml
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
index c76d67b47b336..50c045ab40986 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
@@ -1873,6 +1873,18 @@ DWARFASTParserClang::ParseStructureLikeDIE(const
SymbolContext &sc,
clang_type =
m_ast.CreateClassTemplateSpecializationType(class_specialization_decl);
+ if (!class_specialization_decl) {
+ if (log) {
+ dwarf->GetObjectFile()->GetModule()->LogMessage(
+ log,
+ "SymbolFileDWARF({0:p}) - Specialization for "
+ "clang::ClassTemplateDecl({1:p}) already exists.",
+ static_cast<void *>(this),
+ static_cast<void *>(class_template_decl));
+ }
+ return TypeSP();
+ }
+
m_ast.SetMetadata(class_template_decl, metadata);
m_ast.SetMetadata(class_specialization_decl, metadata);
}
diff --git a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
index 82e07bb8e0ffb..cb3a1906e81e3 100644
--- a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
+++ b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
@@ -1676,6 +1676,14 @@ TypeSystemClang::CreateClassTemplateSpecializationDecl(
class_template_specialization_decl->setInstantiationOf(class_template_decl);
class_template_specialization_decl->setTemplateArgs(
TemplateArgumentList::CreateCopy(ast, args));
+ void *InsertPos = nullptr;
+ if (!class_template_decl->findSpecialization(args, InsertPos)) {
+ // Add this specialization to the class template.
+ class_template_decl->AddSpecialization(class_template_specialization_decl,
+ InsertPos);
+ } else
+ // Specialization exists, so return nullptr.
+ return nullptr;
ast.getTypeDeclType(class_template_specialization_decl, nullptr);
class_template_specialization_decl->setDeclName(
class_template_decl->getDeclName());
diff --git a/lldb/unittests/SymbolFile/DWARF/CMakeLists.txt
b/lldb/unittests/SymbolFile/DWARF/CMakeLists.txt
index eb2e00adba64b..88492188e794b 100644
--- a/lldb/unittests/SymbolFile/DWARF/CMakeLists.txt
+++ b/lldb/unittests/SymbolFile/DWARF/CMakeLists.txt
@@ -27,6 +27,7 @@ add_lldb_unittest(SymbolFileDWARFTests
set(test_inputs
test-dwarf.exe
- DW_AT_default_value-test.yaml)
+ DW_AT_default_value-test.yaml
+ DW_AT_spec_decl_exists-test.yaml)
add_unittest_inputs(SymbolFileDWARFTests "${test_inputs}")
diff --git a/lldb/unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp
b/lldb/unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp
index d608a57382096..3b9fbbe6f6254 100644
--- a/lldb/unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp
+++ b/lldb/unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp
@@ -599,6 +599,40 @@ TEST_F(DWARFASTParserClangTests,
TestDefaultTemplateParamParsing) {
}
}
+TEST_F(DWARFASTParserClangTests, TestSpecDeclExistsError) {
+ // Tests that parsing a ClassTemplateSpecializationDecl that already exists
+ // is handled gracefully.
+ auto BufferOrError = llvm::MemoryBuffer::getFile(
+ GetInputFilePath("DW_AT_spec_decl_exists-test.yaml"), /*IsText=*/true);
+ ASSERT_TRUE(BufferOrError);
+ YAMLModuleTester t(BufferOrError.get()->getBuffer());
+
+ DWARFUnit *unit = t.GetDwarfUnit();
+ ASSERT_NE(unit, nullptr);
+ const DWARFDebugInfoEntry *cu_entry = unit->DIE().GetDIE();
+ ASSERT_EQ(cu_entry->Tag(), DW_TAG_compile_unit);
+ DWARFDIE cu_die(unit, cu_entry);
+
+ auto holder = std::make_unique<clang_utils::TypeSystemClangHolder>("ast");
+ auto &ast_ctx = *holder->GetAST();
+ DWARFASTParserClangStub ast_parser(ast_ctx);
+
+ llvm::SmallVector<lldb::TypeSP, 2> specializations;
+ for (DWARFDIE die : cu_die.children()) {
+ SymbolContext sc;
+ bool new_type = false;
+ auto type = ast_parser.ParseTypeFromDWARF(sc, die, &new_type);
+ llvm::StringRef die_name = llvm::StringRef(die.GetName());
+ if (die_name.starts_with("_Optional_payload")) {
+ specializations.push_back(std::move(type));
+ }
+ }
+
+ ASSERT_EQ(specializations.size(), 2U);
+ ASSERT_NE(specializations[0], nullptr);
+ ASSERT_EQ(specializations[1], nullptr);
+}
+
TEST_F(DWARFASTParserClangTests, TestUniqueDWARFASTTypeMap_CppInsertMapFind) {
// This tests the behaviour of UniqueDWARFASTTypeMap under
// following scenario:
diff --git
a/lldb/unittests/SymbolFile/DWARF/Inputs/DW_AT_spec_decl_exists-test.yaml
b/lldb/unittests/SymbolFile/DWARF/Inputs/DW_AT_spec_decl_exists-test.yaml
new file mode 100644
index 0000000000000..6e1c15d49534d
--- /dev/null
+++ b/lldb/unittests/SymbolFile/DWARF/Inputs/DW_AT_spec_decl_exists-test.yaml
@@ -0,0 +1,677 @@
+# struct Type {};
+#
+# template <typename _Tp, bool, bool, bool> struct _Optional_payload;
+#
+# template <typename _Tp> struct _Optional_payload<_Tp, true, false, false> {};
+#
+# template <typename _Tp, bool _Copy, bool _Move>
+# struct _Optional_payload<_Tp, false, _Copy, _Move>
+# : _Optional_payload<_Tp, true, false, false> {};
+#
+# int main() {
+# _Optional_payload<Type, false, false, true> X;
+# }
+#
+# YAML generated on Linux using obj2yaml on the above program compiled with
+# G++. This is malformed DWARF that is missing DW_TAG_template_value_parameter
+# entries, which is important for the test because that makes the two
+# specializations look like identical structure definitions.
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