ObjectFile: introduce a COFF object file plugin

[compnerd]

Summary

Windows uses COFF as an object file format and PE/COFF as an executable
file format. They are subtly different and certain elements of a COFF
file may not be present in an executable. Introduce a new plugin to add
support for the COFF object file format which is required to support
loading of modules built with -gmodules. This is motivated by Swift
which serialises debugging information into a PCM which is a COFF object
file.

[aprantl]

Could you build this into a yaml2obj obj2yaml plugin, so we could test this?
Alternatively, you could check in a minimal binary.

[aprantl]

Is there a way to compile something with clang and then load the object file into lldb-test so we could add a shell test for it?

[bulbazord]

We're definitely going to want a test for this, either a shell test or a unit test.

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

104–105

Reading the implementation of the constructor, it looks like the constructor can fail to initialize correctly (specifically m_object may not be correctly populated). What are callers supposed to do in the way of validation here? Maybe there is further validation we can do in this function so that the constructor is only invoked if we're absolutely sure it will work?

[compnerd]

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

104–105

There isn't much you can do IMO. The new can fail just as well - at which point, what do we do? The constructor should only really fail if the return type from libLLVMObject has suddenly changed into an invalid type. That cast really cannot fail in a way that we can recover from.

[bulbazord]

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

104–105

createBinary and the subsequent cast may not fail in a recoverable fashion but doing it in the constructor means that whatever is trying to create an object gets back an ObjectFileCOFF object even if it wasn't initialized correctly. If you did that work in CreateInstance, you could return nullptr if createBinary and that cast failed.

[compnerd]

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

104–105

Ah, sinking that into this seems plausible, and then the constructor takes the binary? WFM!

[compnerd]

Address feedback, add test

[bulbazord]

LGTM

[aprantl]

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

204

Can these be correct? They seem too long.

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.h

17

Can you add a short doxygen comment?

87

We usually don't sign our FIXMEs :-)

[tschuett]

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

27

Could you turn this into a static instead?

[compnerd]

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

204

They do exceed the COFF limit of 8 characters. However, this is what is actually emitted with a tweak to indicate the long name. This is why I cannot simply use the Section->Name and need to extract the long name through the generic SectionRef.

[compnerd]

Address feedback

lldb/source/Plugins/ObjectFile/CMakeLists.txt

 add_subdirectory(Breakpad)
+add_subdirectory(COFF)
 add_subdirectory(ELF)
 add_subdirectory(JSON)
 add_subdirectory(Mach-O)
 add_subdirectory(Minidump)
 add_subdirectory(PDB)
 add_subdirectory(PECOFF)
 add_subdirectory(Placeholder)
 add_subdirectory(wasm)

lldb/source/Plugins/ObjectFile/COFF/CMakeLists.txt

+add_lldb_library(lldbPluginObjectFileCOFF PLUGIN
+  ObjectFileCOFF.cpp
+
+  LINK_LIBS
+    lldbCore
+    lldbHost
+    lldbSymbol
+    lldbTarget
+
+  LINK_COMPONENTS
+    BinaryFormat
+    Object
+    Support)

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.h

+//===-- ObjectFileCOFF.h -------------------------------------- -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_OBJECTFILE_COFF_OBJECTFILECOFF_H
+#define LLDB_SOURCE_PLUGINS_OBJECTFILE_COFF_OBJECTFILECOFF_H
+
+#include "lldb/Symbol/ObjectFile.h"
+
+#include "llvm/Object/COFF.h"
+
+/// \class ObjectFileELF
+/// Generic COFF object file reader.
+///
+/// This class provides a generic COFF reader plugin implementing the ObjectFile
+/// protocol.  Assumes that the COFF object format is a Microsoft style COFF
+/// rather than the full generality afforded by it.
+class ObjectFileCOFF : public lldb_private::ObjectFile {
+  std::unique_ptr<llvm::object::COFFObjectFile> m_object;
+  lldb_private::UUID m_uuid;
+
+  ObjectFileCOFF(std::unique_ptr<llvm::object::COFFObjectFile> object,
+                 const lldb::ModuleSP &module_sp, lldb::DataBufferSP data_sp,
+                 lldb::offset_t data_offset, const lldb_private::FileSpec *file,
+                 lldb::offset_t file_offset, lldb::offset_t length)
+    : ObjectFile(module_sp, file, file_offset, length, data_sp, data_offset),
+      m_object(std::move(object)) {}
+
+public:
+  ~ObjectFileCOFF() override;
+
+  static void Initialize();
+  static void Terminate();
+
+  static llvm::StringRef GetPluginNameStatic() { return "COFF"; }
+  static llvm::StringRef GetPluginDescriptionStatic() {
+    return "COFF Object File Reader";
+  }
+
+  static lldb_private::ObjectFile *
+  CreateInstance(const lldb::ModuleSP &module_sp, lldb::DataBufferSP data_sp,
+                 lldb::offset_t data_offset, const lldb_private::FileSpec *file,
+                 lldb::offset_t file_offset, lldb::offset_t length);
+
+  static lldb_private::ObjectFile *
+  CreateMemoryInstance(const lldb::ModuleSP &module_sp,
+                       lldb::WritableDataBufferSP data_sp,
+                       const lldb::ProcessSP &process_sp, lldb::addr_t header);
+
+  static size_t GetModuleSpecifications(const lldb_private::FileSpec &file,
+                                        lldb::DataBufferSP &data_sp,
+                                        lldb::offset_t data_offset,
+                                        lldb::offset_t file_offset,
+                                        lldb::offset_t length,
+                                        lldb_private::ModuleSpecList &specs);
+
+  // LLVM RTTI support
+  static char ID;
+  bool isA(const void *ClassID) const override {
+    return ClassID == &ID || ObjectFile::isA(ClassID);
+  }
+  static bool classof(const ObjectFile *obj) { return obj->isA(&ID); }
+
+  // PluginInterface protocol
+  llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
+
+  // ObjectFile protocol
+  void Dump(lldb_private::Stream *stream) override;
+
+  uint32_t GetAddressByteSize() const override;
+
+  uint32_t GetDependentModules(lldb_private::FileSpecList &specs) override {
+    return 0;
+  }
+
+  bool IsExecutable() const override {
+    // COFF is an object file format only, it cannot host an executable.
+    return false;
+  }
+
+  lldb_private::ArchSpec GetArchitecture() override;
+
+  void CreateSections(lldb_private::SectionList &) override;
+
+  void ParseSymtab(lldb_private::Symtab &) override;
+
+  bool IsStripped() override {
+    // FIXME see if there is a good way to identify a /Z7 v /Zi or /ZI build.
+    return false;
+  }
+
+  lldb_private::UUID GetUUID() override { return m_uuid; }
+
+  lldb::ByteOrder GetByteOrder() const override {
+    // Microsoft always uses little endian.
+    return lldb::ByteOrder::eByteOrderLittle;
+  }
+
+  bool ParseHeader() override;
+
+  lldb_private::ObjectFile::Type CalculateType() override {
+    // COFF is an object file format only, it cannot host an executable.
+    return lldb_private::ObjectFile::eTypeObjectFile;
+  }
+
+  lldb_private::ObjectFile::Strata CalculateStrata() override {
+    // FIXME the object file may correspond to a kernel image.
+    return lldb_private::ObjectFile::eStrataUser;
+  }
+};
+
+#endif

lldb/source/Plugins/ObjectFile/COFF/ObjectFileCOFF.cpp

+//===-- ObjectFileCOFF.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "ObjectFileCOFF.h"
+
+#include "lldb/Core/Module.h"
+#include "lldb/Core/ModuleSpec.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Utility/LLDBLog.h"
+
+#include "llvm/Support/Error.h"
+#include "llvm/Support/FormatAdapters.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+using namespace llvm;
+using namespace llvm::object;
+
+static bool IsCOFFObjectFile(const DataBufferSP &data) {
+  return identify_magic(toStringRef(data->GetData())) ==
+         file_magic::coff_object;
+}
+
+LLDB_PLUGIN_DEFINE(ObjectFileCOFF)
+
+char ObjectFileCOFF::ID;
+
+ObjectFileCOFF::~ObjectFileCOFF() = default;
+
+void ObjectFileCOFF::Initialize() {
+  PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                GetPluginDescriptionStatic(), CreateInstance,
+                                CreateMemoryInstance, GetModuleSpecifications);
+}
+
+void ObjectFileCOFF::Terminate() {
+  PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+lldb_private::ObjectFile *
+ObjectFileCOFF::CreateInstance(const ModuleSP &module_sp, DataBufferSP data_sp,
+                               offset_t data_offset, const FileSpec *file,
+                               offset_t file_offset, offset_t length) {
+  Log *log = GetLog(LLDBLog::Object);
+
+  if (!data_sp) {
+    data_sp = MapFileData(*file, length, file_offset);
+    if (!data_sp) {
+      LLDB_LOG(log,
+               "Failed to create ObjectFileCOFF instance: cannot read file {0}",
+               file->GetPath());
+      return nullptr;
+    }
+    data_offset = 0;
+  }
+
+  assert(data_sp && "must have mapped file at this point");
+
+  if (!IsCOFFObjectFile(data_sp))
+    return nullptr;
+
+  if (data_sp->GetByteSize() < length) {
+    data_sp = MapFileData(*file, length, file_offset);
+    if (!data_sp) {
+      LLDB_LOG(log,
+               "Failed to create ObjectFileCOFF instance: cannot read file {0}",
+               file->GetPath());
+      return nullptr;
+    }
+    data_offset = 0;
+  }
+
+
+  MemoryBufferRef buffer{toStringRef(data_sp->GetData()),
+                         file->GetFilename().GetStringRef()};
+
+  Expected<std::unique_ptr<Binary>> binary = createBinary(buffer);
+  if (!binary) {
+    LLDB_LOG_ERROR(log, binary.takeError(),
+                   "Failed to create binary for file ({1}): {0}",
+                   file->GetPath());
+    return nullptr;
+  }
+
+  LLDB_LOG(log, "ObjectFileCOFF::ObjectFileCOFF module = {1} ({2}), file = {3}",
+           module_sp.get(), module_sp->GetSpecificationDescription(),
+           file->GetPath());
+
+  return new ObjectFileCOFF(unique_dyn_cast<COFFObjectFile>(std::move(*binary)),
+                            module_sp, data_sp, data_offset, file, file_offset,
+                            length);
+}
+
+lldb_private::ObjectFile *ObjectFileCOFF::CreateMemoryInstance(
+    const ModuleSP &module_sp, WritableDataBufferSP data_sp,
+    const ProcessSP &process_sp, addr_t header) {
+  // FIXME: do we need to worry about construction from a memory region?
+  return nullptr;
+}
+
+size_t ObjectFileCOFF::GetModuleSpecifications(
+    const FileSpec &file, DataBufferSP &data_sp, offset_t data_offset,
+    offset_t file_offset, offset_t length, ModuleSpecList &specs) {
+  if (!IsCOFFObjectFile(data_sp))
+    return 0;
+
+  MemoryBufferRef buffer{toStringRef(data_sp->GetData()),
+                         file.GetFilename().GetStringRef()};
+  Expected<std::unique_ptr<Binary>> binary = createBinary(buffer);
+  if (!binary) {
+    Log *log = GetLog(LLDBLog::Object);
+    LLDB_LOG_ERROR(log, binary.takeError(),
+                   "Failed to create binary for file ({1}): {0}",
+                   file.GetFilename());
+    return 0;
+  }
+
+  std::unique_ptr<COFFObjectFile> object =
+      unique_dyn_cast<COFFObjectFile>(std::move(*binary));
+  switch (static_cast<COFF::MachineTypes>(object->getMachine())) {
+  case COFF::IMAGE_FILE_MACHINE_I386:
+    specs.Append(ModuleSpec(file, ArchSpec("i686-unknown-windows-msvc")));
+    return 1;
+  case COFF::IMAGE_FILE_MACHINE_AMD64:
+    specs.Append(ModuleSpec(file, ArchSpec("x86_64-unknown-windows-msvc")));
+    return 1;
+  case COFF::IMAGE_FILE_MACHINE_ARMNT:
+    specs.Append(ModuleSpec(file, ArchSpec("armv7-unknown-windows-msvc")));
+    return 1;
+  case COFF::IMAGE_FILE_MACHINE_ARM64:
+    specs.Append(ModuleSpec(file, ArchSpec("aarch64-unknown-windows-msvc")));
+    return 1;
+  default:
+    return 0;
+  }
+}
+
+void ObjectFileCOFF::Dump(Stream *stream) {
+  ModuleSP module(GetModule());
+  if (!module)
+    return;
+
+  std::lock_guard<std::recursive_mutex> guard(module->GetMutex());
+
+  stream->Printf("%p: ", static_cast<void *>(this));
+  stream->Indent();
+  stream->PutCString("ObjectFileCOFF");
+  *stream << ", file = '" << m_file
+          << "', arch = " << GetArchitecture().GetArchitectureName() << '\n';
+
+  if (SectionList *sections = GetSectionList())
+    sections->Dump(stream->AsRawOstream(), stream->GetIndentLevel(), nullptr,
+                   true, std::numeric_limits<uint32_t>::max());
+}
+
+uint32_t ObjectFileCOFF::GetAddressByteSize() const {
+  return const_cast<ObjectFileCOFF *>(this)->GetArchitecture().GetAddressByteSize();
+}
+
+ArchSpec ObjectFileCOFF::GetArchitecture() {
+  switch (static_cast<COFF::MachineTypes>(m_object->getMachine())) {
+  case COFF::IMAGE_FILE_MACHINE_I386:
+    return ArchSpec("i686-unknown-windows-msvc");
+  case COFF::IMAGE_FILE_MACHINE_AMD64:
+    return ArchSpec("x86_64-unknown-windows-msvc");
+  case COFF::IMAGE_FILE_MACHINE_ARMNT:
+    return ArchSpec("armv7-unknown-windows-msvc");
+  case COFF::IMAGE_FILE_MACHINE_ARM64:
+    return ArchSpec("aarch64-unknown-windows-msvc");
+  default:
+    return ArchSpec();
+  }
+}
+
+void ObjectFileCOFF::CreateSections(lldb_private::SectionList &sections) {
+  if (m_sections_up)
+    return;
+
+  m_sections_up = std::make_unique<SectionList>();
+  ModuleSP module(GetModule());
+  if (!module)
+    return;
+
+  std::lock_guard<std::recursive_mutex> guard(module->GetMutex());
+
+  auto SectionType = [](StringRef Name,
+                        const coff_section *Section) -> lldb::SectionType {
+    lldb::SectionType type =
+        StringSwitch<lldb::SectionType>(Name)
+            // DWARF Debug Sections
+            .Case(".debug_abbrev", eSectionTypeDWARFDebugAbbrev)
+            .Case(".debug_info", eSectionTypeDWARFDebugInfo)
+            .Case(".debug_line", eSectionTypeDWARFDebugLine)
+            .Case(".debug_pubnames", eSectionTypeDWARFDebugPubNames)
+            .Case(".debug_pubtypes", eSectionTypeDWARFDebugPubTypes)
+            .Case(".debug_str", eSectionTypeDWARFDebugStr)
+            // CodeView Debug Sections: .debug$S, .debug$T
+            .StartsWith(".debug$", eSectionTypeDebug)
+            .Case("clangast", eSectionTypeOther)
+            .Default(eSectionTypeInvalid);
+    if (type != eSectionTypeInvalid)
+      return type;
+
+    if (Section->Characteristics & COFF::IMAGE_SCN_CNT_CODE)
+      return eSectionTypeCode;
+    if (Section->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
+      return eSectionTypeData;
+    if (Section->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
+      return Section->SizeOfRawData ? eSectionTypeData : eSectionTypeZeroFill;
+    return eSectionTypeOther;
+  };
+  auto Permissions = [](const object::coff_section *Section) -> uint32_t {
+    uint32_t permissions = 0;
+    if (Section->Characteristics & COFF::IMAGE_SCN_MEM_EXECUTE)
+      permissions |= lldb::ePermissionsExecutable;
+    if (Section->Characteristics & COFF::IMAGE_SCN_MEM_READ)
+      permissions |= lldb::ePermissionsReadable;
+    if (Section->Characteristics & COFF::IMAGE_SCN_MEM_WRITE)
+      permissions |= lldb::ePermissionsWritable;
+    return permissions;
+  };
+
+  for (const auto &SecRef : m_object->sections()) {
+    const auto COFFSection = m_object->getCOFFSection(SecRef);
+
+    llvm::Expected<StringRef> Name = SecRef.getName();
+    StringRef SectionName = Name ? *Name : COFFSection->Name;
+    if (!Name)
+      consumeError(Name.takeError());
+
+    SectionSP section =
+        std::make_unique<Section>(module, this,
+                                  static_cast<user_id_t>(SecRef.getIndex()),
+                                  ConstString(SectionName),
+                                  SectionType(SectionName, COFFSection),
+                                  COFFSection->VirtualAddress,
+                                  COFFSection->VirtualSize,
+                                  COFFSection->PointerToRawData,
+                                  COFFSection->SizeOfRawData,
+                                  COFFSection->getAlignment(),
+                                  0);
+    section->SetPermissions(Permissions(COFFSection));
+
+    m_sections_up->AddSection(section);
+    sections.AddSection(section);
+  }
+}
+
+void ObjectFileCOFF::ParseSymtab(lldb_private::Symtab &symtab) {
+  Log *log = GetLog(LLDBLog::Object);
+
+  SectionList *sections = GetSectionList();
+  symtab.Reserve(symtab.GetNumSymbols() + m_object->getNumberOfSymbols());
+
+  auto SymbolType = [](const COFFSymbolRef &Symbol) -> lldb::SymbolType {
+    if (Symbol.getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION)
+      return eSymbolTypeCode;
+    if (Symbol.getBaseType() == COFF::IMAGE_SYM_TYPE_NULL &&
+        Symbol.getComplexType() == COFF::IMAGE_SYM_DTYPE_NULL)
+      return eSymbolTypeData;
+    return eSymbolTypeInvalid;
+  };
+
+  for (const auto &SymRef : m_object->symbols()) {
+    const auto COFFSymRef = m_object->getCOFFSymbol(SymRef);
+
+    Expected<StringRef> NameOrErr = SymRef.getName();
+    if (auto error = NameOrErr.takeError()) {
+      LLDB_LOG(log, "ObjectFileCOFF: failed to get symbol name: {0}",
+               llvm::fmt_consume(std::move(error)));
+      continue;
+    }
+
+    Symbol symbol;
+    symbol.GetMangled().SetValue(ConstString(*NameOrErr));
+
+    int16_t SecIdx = static_cast<int16_t>(COFFSymRef.getSectionNumber());
+    if (SecIdx == COFF::IMAGE_SYM_ABSOLUTE) {
+      symbol.GetAddressRef() = Address{COFFSymRef.getValue()};
+      symbol.SetType(eSymbolTypeAbsolute);
+    } else if (SecIdx >= 1) {
+      symbol.GetAddressRef() = Address(sections->GetSectionAtIndex(SecIdx - 1),
+                                       COFFSymRef.getValue());
+      symbol.SetType(SymbolType(COFFSymRef));
+    }
+
+    symtab.AddSymbol(symbol);
+  }
+
+  LLDB_LOG(log, "ObjectFileCOFF::ParseSymtab processed {0} symbols",
+           m_object->getNumberOfSymbols());
+}
+
+bool ObjectFileCOFF::ParseHeader() {
+  ModuleSP module(GetModule());
+  if (!module)
+    return false;
+
+  std::lock_guard<std::recursive_mutex> guard(module->GetMutex());
+
+  m_data.SetByteOrder(eByteOrderLittle);
+  m_data.SetAddressByteSize(GetAddressByteSize());
+
+  return true;
+}

lldb/test/Shell/ObjectFile/COFF/basic.yaml

+# RUN: yaml2obj %s -o %t
+# RUN: lldb-test object-file %t | FileCheck %s
+
+# CHECK: Plugin name: COFF
+# CHECK: Architecture: x86_64-unknown-windows-msvc
+
+# CHECK: Executable: false
+# CHECK: Stripped: false
+# CHECK: Type: object file
+# CHECK: Strata: user
+
+# CHECK: Name: .text
+# CHECK: Type: code
+
+# CHECK: Name: .data
+# CHECK: Type: data
+
+# CHECK: Name: .bss
+# CHECK: Type: zero-fill
+
+# CHECK: Name: .rdata
+# CHECK: Type: data
+
+# CHECK: Name: .debug_abbrev
+# CHECK: Type: dwarf-abbrev
+
+# CHECK: Name: .debug_info
+# CHECK: Type: dwarf-info
+
+# CHECK: Name: .debug_str
+# CHECK: Type: dwarf-str
+
+# CHECK: Name: .debug_line
+# CHECK: Type: dwarf-line
+
+--- !COFF
+header:
+  Machine:         IMAGE_FILE_MACHINE_AMD64
+  Characteristics: [  ]
+sections:
+  - Name:            .text
+    Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
+    Alignment:       4
+    SectionData:     ''
+  - Name:            .data
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ, IMAGE_SCN_MEM_WRITE ]
+    Alignment:       4
+    SectionData:     ''
+  - Name:            .bss
+    Characteristics: [ IMAGE_SCN_CNT_UNINITIALIZED_DATA, IMAGE_SCN_MEM_READ, IMAGE_SCN_MEM_WRITE ]
+    Alignment:       4
+    SectionData:     ''
+    SizeOfRawData:   0
+  - Name:            .rdata
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+    Alignment:       1
+    SectionData:     31343A34313A303700
+  - Name:            .debug_abbrev
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+    Alignment:       1
+    SectionData:     011101250E1305030E10171B0E0000023400030E49133F193A0B3B0B02180000030101491300000421004913370B000005260049130000062400030E3E0B0B0B0000072400030E0B0B3E0B000000
+  - Name:            .debug_info
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+    Alignment:       1
+    SectionData:     4F0000000400000000000801000000000C00320000000000000034000000023F00000033000000010109030000000000000000033F000000044B0000000900054400000006490000000601074E000000080700
+    Relocations:
+      - VirtualAddress:  6
+        SymbolName:      .debug_abbrev
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  12
+        SymbolName:      .debug_str
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  18
+        SymbolName:      .debug_str
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  22
+        SymbolName:      .debug_line
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  26
+        SymbolName:      .debug_str
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  31
+        SymbolName:      .debug_str
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  43
+        SymbolName:      timestamp
+        Type:            IMAGE_REL_AMD64_ADDR64
+      - VirtualAddress:  69
+        SymbolName:      .debug_str
+        Type:            IMAGE_REL_AMD64_SECREL
+      - VirtualAddress:  76
+        SymbolName:      .debug_str
+        Type:            IMAGE_REL_AMD64_SECREL
+  - Name:            .debug_str
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+    Alignment:       1
+    SectionData:     4170706C6520636C616E672076657273696F6E2031342E302E332028636C616E672D313430332E302E32322E31342E3129002D002F7661722F656D7074790074696D657374616D700063686172005F5F41525241595F53495A455F545950455F5F00
+  - Name:            .debug_line
+    Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+    Alignment:       1
+    SectionData:     2500000004001F000000010101FB0E0D000101010100000001000001003C737464696E3E0000000000
+  - Name:            .llvm_addrsig
+    Characteristics: [ IMAGE_SCN_LNK_REMOVE ]
+    Alignment:       1
+    SectionData:     ''
+symbols:
+  - Name:            .text
+    Value:           0
+    SectionNumber:   1
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          0
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          1
+  - Name:            .data
+    Value:           0
+    SectionNumber:   2
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          0
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          2
+  - Name:            .bss
+    Value:           0
+    SectionNumber:   3
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          0
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          3
+  - Name:            .rdata
+    Value:           0
+    SectionNumber:   4
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          9
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        479132390
+      Number:          4
+  - Name:            .debug_abbrev
+    Value:           0
+    SectionNumber:   5
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          78
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        937319867
+      Number:          5
+  - Name:            .debug_info
+    Value:           0
+    SectionNumber:   6
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          83
+      NumberOfRelocations: 9
+      NumberOfLinenumbers: 0
+      CheckSum:        1429914004
+      Number:          6
+  - Name:            .debug_str
+    Value:           0
+    SectionNumber:   7
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          98
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        580727506
+      Number:          7
+  - Name:            .debug_line
+    Value:           0
+    SectionNumber:   8
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          41
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        2878960311
+      Number:          8
+  - Name:            .llvm_addrsig
+    Value:           0
+    SectionNumber:   9
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+    SectionDefinition:
+      Length:          0
+      NumberOfRelocations: 0
+      NumberOfLinenumbers: 0
+      CheckSum:        0
+      Number:          9
+  - Name:            '@feat.00'
+    Value:           0
+    SectionNumber:   -1
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+  - Name:            timestamp
+    Value:           0
+    SectionNumber:   4
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_EXTERNAL
+  - Name:            .file
+    Value:           0
+    SectionNumber:   -2
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_FILE
+    File:            '-'
+...