labath created this revision.
labath added reviewers: JDevlieghere, clayborg, jingham.
Herald added subscribers: aprantl, mehdi_amini, mgorny.
This patch is pretty much a big noop. It adds the ability to create a
DebugNamesDWARFIndex class, but the class itself is not implemented in
any useful way. The I am putting it up this way is because of the
setting to control whether it gets used. My idea for it was the
following:
- while the feature is under development (which hopefully won't take much
longer), it will default to off. Tests will override it to true.
- once the feature is complete and we are reasonably certain it works, we flip
the switch to "on" while keeping the ability to turn it off for troubleshooting
purposes.
- after it has been on for a release or two and it hasn't blown up into
anyone's face, we remove the setting altogether.
https://reviews.llvm.org/D47629
Files:
source/Plugins/SymbolFile/DWARF/CMakeLists.txt
source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp
source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.h
source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
Index: source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
===================================================================
--- source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -64,6 +64,7 @@
#include "DWARFDeclContext.h"
#include "DWARFFormValue.h"
#include "DWARFUnit.h"
+#include "DebugNamesDWARFIndex.h"
#include "LogChannelDWARF.h"
#include "ManualDWARFIndex.h"
#include "SymbolFileDWARFDebugMap.h"
@@ -117,15 +118,30 @@
enum { ePropertySymLinkPaths };
+PropertyDefinition g_experimental_properties[] = {
+ {"use-debug-names", OptionValue::eTypeBoolean, true, 0, nullptr, nullptr,
+ "Use .debug_names index section."},
+ {nullptr, OptionValue::eTypeInvalid, false, 0, nullptr, nullptr, nullptr},
+};
+enum { ePropertyDebugNames };
+
class PluginProperties : public Properties {
+ OptionValuePropertiesSP m_experimental_sp;
+
public:
static ConstString GetSettingName() {
return SymbolFileDWARF::GetPluginNameStatic();
}
PluginProperties() {
m_collection_sp.reset(new OptionValueProperties(GetSettingName()));
m_collection_sp->Initialize(g_properties);
+ ConstString experimental_name(Properties::GetExperimentalSettingsName());
+ m_experimental_sp = std::make_shared<OptionValueProperties>(experimental_name);
+ m_experimental_sp->Initialize(g_experimental_properties);
+ m_collection_sp->AppendProperty(
+ ConstString(Properties::GetExperimentalSettingsName()),
+ ConstString("Experimental settings"), true, m_experimental_sp);
}
FileSpecList &GetSymLinkPaths() {
@@ -135,6 +151,11 @@
assert(option_value);
return option_value->GetCurrentValue();
}
+
+ bool UseDebugNames() const {
+ return m_experimental_sp->GetPropertyAtIndexAsBoolean(
+ nullptr, ePropertyDebugNames, false);
+ }
};
typedef std::shared_ptr<PluginProperties> SymbolFileDWARFPropertiesSP;
@@ -432,6 +453,7 @@
}
void SymbolFileDWARF::InitializeObject() {
+ Log *log = LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_INFO);
ModuleSP module_sp(m_obj_file->GetModule());
if (module_sp) {
const SectionList *section_list = module_sp->GetSectionList();
@@ -452,9 +474,26 @@
apple_namespaces, apple_types, apple_objc,
get_debug_str_data());
- if (!m_index)
- m_index = llvm::make_unique<ManualDWARFIndex>(*GetObjectFile()->GetModule(),
- DebugInfo());
+ if (m_index)
+ return;
+
+ DWARFDataExtractor debug_names;
+ LoadSectionData(eSectionTypeDWARFDebugNames, debug_names);
+ if (debug_names.GetByteSize() > 0 &&
+ GetGlobalPluginProperties()->UseDebugNames()) {
+ llvm::Expected<std::unique_ptr<DebugNamesDWARFIndex>> index_or =
+ DebugNamesDWARFIndex::Create(*GetObjectFile()->GetModule(), debug_names,
+ get_debug_str_data(), DebugInfo());
+ if (index_or) {
+ m_index = std::move(*index_or);
+ return;
+ }
+ LLDB_LOG_ERROR(log, index_or.takeError(),
+ "Unable to read .debug_names data: {0}");
+ }
+
+ m_index = llvm::make_unique<ManualDWARFIndex>(*GetObjectFile()->GetModule(),
+ DebugInfo());
}
bool SymbolFileDWARF::SupportedVersion(uint16_t version) {
Index: source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.h
===================================================================
--- /dev/null
+++ source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.h
@@ -0,0 +1,74 @@
+//===-- DebugNamesDWARFIndex.h ---------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_DEBUGNAMESDWARFINDEX_H
+#define LLDB_DEBUGNAMESDWARFINDEX_H
+
+#include "Plugins/SymbolFile/DWARF/DWARFIndex.h"
+#include "lldb/Utility/ConstString.h"
+#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
+
+namespace lldb_private {
+class DebugNamesDWARFIndex : public DWARFIndex {
+public:
+ static llvm::Expected<std::unique_ptr<DebugNamesDWARFIndex>>
+ Create(Module &module, DWARFDataExtractor debug_names,
+ DWARFDataExtractor debug_str, DWARFDebugInfo *debug_info);
+
+ void Preload() override {}
+
+ void GetGlobalVariables(ConstString name, DIEArray &offsets) override {}
+ void GetGlobalVariables(const RegularExpression ®ex,
+ DIEArray &offsets) override {}
+ void GetGlobalVariables(const DWARFUnit &cu, DIEArray &offsets) override {}
+ void GetObjCMethods(ConstString class_name, DIEArray &offsets) override {}
+ void GetCompleteObjCClass(ConstString class_name, bool must_be_implementation,
+ DIEArray &offsets) override {}
+ void GetTypes(ConstString name, DIEArray &offsets) override {}
+ void GetTypes(const DWARFDeclContext &context, DIEArray &offsets) override {}
+ void GetNamespaces(ConstString name, DIEArray &offsets) override {}
+ void GetFunctions(
+ ConstString name, DWARFDebugInfo &info,
+ llvm::function_ref<bool(const DWARFDIE &die, bool include_inlines,
+ lldb_private::SymbolContextList &sc_list)>
+ resolve_function,
+ llvm::function_ref<CompilerDeclContext(lldb::user_id_t type_uid)>
+ get_decl_context_containing_uid,
+ const CompilerDeclContext *parent_decl_ctx, uint32_t name_type_mask,
+ bool include_inlines, SymbolContextList &sc_list) override {}
+ void GetFunctions(
+ const RegularExpression ®ex, DWARFDebugInfo &info,
+ llvm::function_ref<bool(const DWARFDIE &die, bool include_inlines,
+ lldb_private::SymbolContextList &sc_list)>
+ resolve_function,
+ bool include_inlines, SymbolContextList &sc_list) override {}
+
+ void ReportInvalidDIEOffset(dw_offset_t offset,
+ llvm::StringRef name) override {}
+ void Dump(Stream &s) override {}
+
+private:
+ DebugNamesDWARFIndex(Module &module,
+ std::unique_ptr<llvm::DWARFDebugNames> debug_names_up,
+ DWARFDataExtractor debug_names_data,
+ DWARFDataExtractor debug_str_data,
+ DWARFDebugInfo *debug_info)
+ : DWARFIndex(module), m_debug_names_up(std::move(debug_names_up)) {}
+
+ // LLVM DWARFDebugNames will hold a non-owning reference to this data, so keep
+ // track of the ownership here.
+ DWARFDataExtractor m_debug_names_data;
+ DWARFDataExtractor m_debug_str_data;
+
+ std::unique_ptr<llvm::DWARFDebugNames> m_debug_names_up;
+};
+
+} // namespace lldb_private
+
+#endif // LLDB_DEBUGNAMESDWARFINDEX_H
Index: source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp
===================================================================
--- /dev/null
+++ source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp
@@ -0,0 +1,33 @@
+//===-- DebugNamesDWARFIndex.cpp -------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.h"
+
+using namespace lldb_private;
+using namespace lldb;
+
+static llvm::DWARFDataExtractor ToLLVM(const DWARFDataExtractor &data) {
+ return llvm::DWARFDataExtractor(
+ llvm::StringRef(reinterpret_cast<const char *>(data.GetDataStart()),
+ data.GetByteSize()),
+ data.GetByteOrder() == eByteOrderLittle, data.GetAddressByteSize());
+}
+
+llvm::Expected<std::unique_ptr<DebugNamesDWARFIndex>>
+DebugNamesDWARFIndex::Create(Module &module, DWARFDataExtractor debug_names,
+ DWARFDataExtractor debug_str,
+ DWARFDebugInfo *debug_info) {
+ auto index_up = llvm::make_unique<llvm::DWARFDebugNames>(ToLLVM(debug_names),
+ ToLLVM(debug_str));
+ if (llvm::Error E = index_up->extract())
+ return std::move(E);
+
+ return std::unique_ptr<DebugNamesDWARFIndex>(new DebugNamesDWARFIndex(
+ module, std::move(index_up), debug_names, debug_str, debug_info));
+}
Index: source/Plugins/SymbolFile/DWARF/CMakeLists.txt
===================================================================
--- source/Plugins/SymbolFile/DWARF/CMakeLists.txt
+++ source/Plugins/SymbolFile/DWARF/CMakeLists.txt
@@ -1,5 +1,6 @@
add_lldb_library(lldbPluginSymbolFileDWARF PLUGIN
AppleDWARFIndex.cpp
+ DebugNamesDWARFIndex.cpp
DIERef.cpp
DWARFAbbreviationDeclaration.cpp
DWARFASTParserClang.cpp
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