https://github.com/tgs-sc updated
https://github.com/llvm/llvm-project/pull/154123
>From f86f3acf76227f618c36147c260ae5fb72fc9e80 Mon Sep 17 00:00:00 2001
From: Timur Golubovich <timur.golubov...@syntacore.com>
Date: Mon, 18 Aug 2025 17:29:01 +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 | 25 +-
.../unittests/SymbolFile/DWARF/CMakeLists.txt | 3 +-
.../DWARF/DWARFASTParserClangTests.cpp | 33 +
.../Inputs/DW_AT_spec_decl_exists-test.yaml | 675 ++++++++++++++++++
4 files changed, 732 insertions(+), 4 deletions(-)
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..c3937929ff1f0 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
@@ -1725,6 +1725,7 @@ DWARFASTParserClang::ParseStructureLikeDIE(const
SymbolContext &sc,
const dw_tag_t tag = die.Tag();
SymbolFileDWARF *dwarf = die.GetDWARF();
LanguageType cu_language = SymbolFileDWARF::GetLanguage(*die.GetCU());
+ ModuleSP module_sp = dwarf->GetObjectFile()->GetModule();
Log *log = GetLog(DWARFLog::TypeCompletion | DWARFLog::Lookups);
ConstString unique_typename(attrs.name);
@@ -1735,7 +1736,7 @@ DWARFASTParserClang::ParseStructureLikeDIE(const
SymbolContext &sc,
GetUniqueTypeNameAndDeclaration(die, cu_language, unique_typename,
unique_decl);
if (log) {
- dwarf->GetObjectFile()->GetModule()->LogMessage(
+ module_sp->LogMessage(
log, "SymbolFileDWARF({0:p}) - {1:x16}: {2} has unique name: {3} ",
static_cast<void *>(this), die.GetID(), DW_TAG_value_to_name(tag),
unique_typename.AsCString());
@@ -1806,7 +1807,7 @@ DWARFASTParserClang::ParseStructureLikeDIE(const
SymbolContext &sc,
if (type_sp) {
if (log) {
- dwarf->GetObjectFile()->GetModule()->LogMessage(
+ module_sp->LogMessage(
log,
"SymbolFileDWARF({0:p}) - {1:x16}: {2} ({3}) type \"{4}\" is an "
"incomplete objc type, complete type is {5:x8}",
@@ -1856,7 +1857,7 @@ DWARFASTParserClang::ParseStructureLikeDIE(const
SymbolContext &sc,
attrs.name.GetCString(), tag_decl_kind, template_param_infos);
if (!class_template_decl) {
if (log) {
- dwarf->GetObjectFile()->GetModule()->LogMessage(
+ module_sp->LogMessage(
log,
"SymbolFileDWARF({0:p}) - {1:x16}: {2} ({3}) type \"{4}\" "
"clang::ClassTemplateDecl failed to return a decl.",
@@ -1873,6 +1874,24 @@ DWARFASTParserClang::ParseStructureLikeDIE(const
SymbolContext &sc,
clang_type =
m_ast.CreateClassTemplateSpecializationType(class_specialization_decl);
+ // Try to find an existing specialization with these template arguments and
+ // template parameter list.
+ void *InsertPos = nullptr;
+ llvm::ArrayRef<clang::TemplateArgument> args =
+ template_param_infos.GetArgs();
+ if (!args.empty() &&
+ !class_template_decl->findSpecialization(args, InsertPos))
+ // Add this specialization to the class template.
+ class_template_decl->AddSpecialization(class_specialization_decl,
+ InsertPos);
+ else {
+ module_sp->ReportError("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/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..7886c5f16a053 100644
--- a/lldb/unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp
+++ b/lldb/unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp
@@ -599,6 +599,39 @@ TEST_F(DWARFASTParserClangTests,
TestDefaultTemplateParamParsing) {
}
}
+TEST_F(DWARFASTParserClangTests, TestSpecDeclExistsError) {
+ // Tests checking error if ClassTemplateSpecializationDecl already exists.
+ 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, 3> types;
+ for (DWARFDIE die : cu_die.children()) {
+ if (die.Tag() == DW_TAG_structure_type) {
+ SymbolContext sc;
+ bool new_type = false;
+ auto type = ast_parser.ParseTypeFromDWARF(sc, die, &new_type);
+ types.push_back(std::move(type));
+ }
+ }
+
+ ASSERT_EQ(types.size(), 3U);
+ ASSERT_NE(types[0], nullptr);
+ ASSERT_NE(types[1], nullptr);
+ ASSERT_EQ(types[2], 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..2a87925574d5e
--- /dev/null
+++ b/lldb/unittests/SymbolFile/DWARF/Inputs/DW_AT_spec_decl_exists-test.yaml
@@ -0,0 +1,675 @@
+# 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;
+# }
+#
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+# compiled with G++.
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