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llvm-project/lldb/source/Symbol/ObjectFile.cpp
Jonas Devlieghere 5be2063e10
[lldb] Support parsing the Wasm symbol table (#153093) 
This PR adds support for parsing the WebAssembly symbol table. The
symbol table is encoded in the "names" section and contains names and
indexes into other sections. For now we only support parsing function
(code) symbols. The result is that you can set breakpoints by symbol
name, while previously breakpoints by name required debug info (DWARF).

This is also necessary for Swift, which checks for the presence of
`swift_release` as a heuristic to determine if there's a static Swift
stdlib.
2025-08-12 15:12:30 -05:00

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//===-- ObjectFile.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 "lldb/Symbol/ObjectFile.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/CallFrameInfo.h"
#include "lldb/Symbol/ObjectContainer.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/SectionLoadList.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataBuffer.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Timer.h"
#include "lldb/lldb-private.h"
#include "llvm/Support/DJB.h"
using namespace lldb;
using namespace lldb_private;
char ObjectFile::ID;
size_t ObjectFile::g_initial_bytes_to_read = 512;
static ObjectFileSP
CreateObjectFromContainer(const lldb::ModuleSP &module_sp, const FileSpec *file,
lldb::offset_t file_offset, lldb::offset_t file_size,
DataBufferSP data_sp, lldb::offset_t &data_offset) {
ObjectContainerCreateInstance callback;
for (uint32_t idx = 0;
(callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(
idx)) != nullptr;
++idx) {
std::unique_ptr<ObjectContainer> object_container_up(callback(
module_sp, data_sp, data_offset, file, file_offset, file_size));
if (object_container_up)
return object_container_up->GetObjectFile(file);
}
return {};
}
ObjectFileSP
ObjectFile::FindPlugin(const lldb::ModuleSP &module_sp, const FileSpec *file,
lldb::offset_t file_offset, lldb::offset_t file_size,
DataBufferSP &data_sp, lldb::offset_t &data_offset) {
LLDB_SCOPED_TIMERF(
"ObjectFile::FindPlugin (module = %s, file = %p, file_offset = "
"0x%8.8" PRIx64 ", file_size = 0x%8.8" PRIx64 ")",
module_sp->GetFileSpec().GetPath().c_str(),
static_cast<const void *>(file), static_cast<uint64_t>(file_offset),
static_cast<uint64_t>(file_size));
if (!module_sp)
return {};
if (!file)
return {};
if (!data_sp) {
const bool file_exists = FileSystem::Instance().Exists(*file);
// We have an object name which most likely means we have a .o file in
// a static archive (.a file). Try and see if we have a cached archive
// first without reading any data first
if (file_exists && module_sp->GetObjectName()) {
ObjectFileSP object_file_sp = CreateObjectFromContainer(
module_sp, file, file_offset, file_size, data_sp, data_offset);
if (object_file_sp)
return object_file_sp;
}
// Ok, we didn't find any containers that have a named object, now lets
// read the first 512 bytes from the file so the object file and object
// container plug-ins can use these bytes to see if they can parse this
// file.
if (file_size > 0) {
data_sp = FileSystem::Instance().CreateDataBuffer(
file->GetPath(), g_initial_bytes_to_read, file_offset);
data_offset = 0;
}
}
if (!data_sp || data_sp->GetByteSize() == 0) {
// Check for archive file with format "/path/to/archive.a(object.o)"
llvm::SmallString<256> path_with_object;
module_sp->GetFileSpec().GetPath(path_with_object);
FileSpec archive_file;
ConstString archive_object;
const bool must_exist = true;
if (ObjectFile::SplitArchivePathWithObject(path_with_object, archive_file,
archive_object, must_exist)) {
file_size = FileSystem::Instance().GetByteSize(archive_file);
if (file_size > 0) {
file = &archive_file;
module_sp->SetFileSpecAndObjectName(archive_file, archive_object);
// Check if this is a object container by iterating through all
// object container plugin instances and then trying to get an
// object file from the container plugins since we had a name.
// Also, don't read
// ANY data in case there is data cached in the container plug-ins
// (like BSD archives caching the contained objects within an
// file).
ObjectFileSP object_file_sp = CreateObjectFromContainer(
module_sp, file, file_offset, file_size, data_sp, data_offset);
if (object_file_sp)
return object_file_sp;
// We failed to find any cached object files in the container plug-
// ins, so lets read the first 512 bytes and try again below...
data_sp = FileSystem::Instance().CreateDataBuffer(
archive_file.GetPath(), g_initial_bytes_to_read, file_offset);
}
}
}
if (data_sp && data_sp->GetByteSize() > 0) {
// Check if this is a normal object file by iterating through all
// object file plugin instances.
ObjectFileCreateInstance callback;
for (uint32_t idx = 0;
(callback = PluginManager::GetObjectFileCreateCallbackAtIndex(idx)) !=
nullptr;
++idx) {
ObjectFileSP object_file_sp(callback(module_sp, data_sp, data_offset,
file, file_offset, file_size));
if (object_file_sp.get())
return object_file_sp;
}
// Check if this is a object container by iterating through all object
// container plugin instances and then trying to get an object file
// from the container.
ObjectFileSP object_file_sp = CreateObjectFromContainer(
module_sp, file, file_offset, file_size, data_sp, data_offset);
if (object_file_sp)
return object_file_sp;
}
// We didn't find it, so clear our shared pointer in case it contains
// anything and return an empty shared pointer
return {};
}
ObjectFileSP ObjectFile::FindPlugin(const lldb::ModuleSP &module_sp,
const ProcessSP &process_sp,
lldb::addr_t header_addr,
WritableDataBufferSP data_sp) {
ObjectFileSP object_file_sp;
if (module_sp) {
LLDB_SCOPED_TIMERF("ObjectFile::FindPlugin (module = "
"%s, process = %p, header_addr = "
"0x%" PRIx64 ")",
module_sp->GetFileSpec().GetPath().c_str(),
static_cast<void *>(process_sp.get()), header_addr);
uint32_t idx;
// Check if this is a normal object file by iterating through all object
// file plugin instances.
ObjectFileCreateMemoryInstance create_callback;
for (idx = 0;
(create_callback =
PluginManager::GetObjectFileCreateMemoryCallbackAtIndex(idx)) !=
nullptr;
++idx) {
object_file_sp.reset(
create_callback(module_sp, data_sp, process_sp, header_addr));
if (object_file_sp.get())
return object_file_sp;
}
}
// We didn't find it, so clear our shared pointer in case it contains
// anything and return an empty shared pointer
object_file_sp.reset();
return object_file_sp;
}
bool ObjectFile::IsObjectFile(lldb_private::FileSpec file_spec) {
DataBufferSP data_sp;
offset_t data_offset = 0;
ModuleSP module_sp = std::make_shared<Module>(file_spec);
return static_cast<bool>(ObjectFile::FindPlugin(
module_sp, &file_spec, 0, FileSystem::Instance().GetByteSize(file_spec),
data_sp, data_offset));
}
size_t ObjectFile::GetModuleSpecifications(const FileSpec &file,
lldb::offset_t file_offset,
lldb::offset_t file_size,
ModuleSpecList &specs,
DataBufferSP data_sp) {
if (!data_sp)
data_sp = FileSystem::Instance().CreateDataBuffer(
file.GetPath(), g_initial_bytes_to_read, file_offset);
if (data_sp) {
if (file_size == 0) {
const lldb::offset_t actual_file_size =
FileSystem::Instance().GetByteSize(file);
if (actual_file_size > file_offset)
file_size = actual_file_size - file_offset;
}
return ObjectFile::GetModuleSpecifications(file, // file spec
data_sp, // data bytes
0, // data offset
file_offset, // file offset
file_size, // file length
specs);
}
return 0;
}
size_t ObjectFile::GetModuleSpecifications(
const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
lldb::offset_t data_offset, lldb::offset_t file_offset,
lldb::offset_t file_size, lldb_private::ModuleSpecList &specs) {
const size_t initial_count = specs.GetSize();
ObjectFileGetModuleSpecifications callback;
uint32_t i;
// Try the ObjectFile plug-ins
for (i = 0;
(callback =
PluginManager::GetObjectFileGetModuleSpecificationsCallbackAtIndex(
i)) != nullptr;
++i) {
if (callback(file, data_sp, data_offset, file_offset, file_size, specs) > 0)
return specs.GetSize() - initial_count;
}
// Try the ObjectContainer plug-ins
for (i = 0;
(callback = PluginManager::
GetObjectContainerGetModuleSpecificationsCallbackAtIndex(i)) !=
nullptr;
++i) {
if (callback(file, data_sp, data_offset, file_offset, file_size, specs) > 0)
return specs.GetSize() - initial_count;
}
return 0;
}
ObjectFile::ObjectFile(const lldb::ModuleSP &module_sp,
const FileSpec *file_spec_ptr,
lldb::offset_t file_offset, lldb::offset_t length,
lldb::DataBufferSP data_sp, lldb::offset_t data_offset)
: ModuleChild(module_sp),
m_file(), // This file could be different from the original module's file
m_type(eTypeInvalid), m_strata(eStrataInvalid),
m_file_offset(file_offset), m_length(length), m_data(), m_process_wp(),
m_memory_addr(LLDB_INVALID_ADDRESS), m_sections_up(), m_symtab_up(),
m_symtab_once_up(new llvm::once_flag()) {
if (file_spec_ptr)
m_file = *file_spec_ptr;
if (data_sp)
m_data.SetData(data_sp, data_offset, length);
Log *log = GetLog(LLDBLog::Object);
LLDB_LOGF(log,
"%p ObjectFile::ObjectFile() module = %p (%s), file = %s, "
"file_offset = 0x%8.8" PRIx64 ", size = %" PRIu64,
static_cast<void *>(this), static_cast<void *>(module_sp.get()),
module_sp->GetSpecificationDescription().c_str(),
m_file ? m_file.GetPath().c_str() : "<NULL>", m_file_offset,
m_length);
}
ObjectFile::ObjectFile(const lldb::ModuleSP &module_sp,
const ProcessSP &process_sp, lldb::addr_t header_addr,
DataBufferSP header_data_sp)
: ModuleChild(module_sp), m_file(), m_type(eTypeInvalid),
m_strata(eStrataInvalid), m_file_offset(0), m_length(0), m_data(),
m_process_wp(process_sp), m_memory_addr(header_addr), m_sections_up(),
m_symtab_up(), m_symtab_once_up(new llvm::once_flag()) {
if (header_data_sp)
m_data.SetData(header_data_sp, 0, header_data_sp->GetByteSize());
Log *log = GetLog(LLDBLog::Object);
LLDB_LOGF(log,
"%p ObjectFile::ObjectFile() module = %p (%s), process = %p, "
"header_addr = 0x%" PRIx64,
static_cast<void *>(this), static_cast<void *>(module_sp.get()),
module_sp->GetSpecificationDescription().c_str(),
static_cast<void *>(process_sp.get()), m_memory_addr);
}
ObjectFile::~ObjectFile() {
Log *log = GetLog(LLDBLog::Object);
LLDB_LOGF(log, "%p ObjectFile::~ObjectFile ()\n", static_cast<void *>(this));
}
bool ObjectFile::SetModulesArchitecture(const ArchSpec &new_arch) {
ModuleSP module_sp(GetModule());
if (module_sp)
return module_sp->SetArchitecture(new_arch);
return false;
}
AddressClass ObjectFile::GetAddressClass(addr_t file_addr) {
Symtab *symtab = GetSymtab();
if (symtab) {
Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr);
if (symbol) {
if (symbol->ValueIsAddress()) {
const SectionSP section_sp(symbol->GetAddressRef().GetSection());
if (section_sp) {
const SectionType section_type = section_sp->GetType();
switch (section_type) {
case eSectionTypeInvalid:
return AddressClass::eUnknown;
case eSectionTypeCode:
return AddressClass::eCode;
case eSectionTypeContainer:
return AddressClass::eUnknown;
case eSectionTypeData:
case eSectionTypeDataCString:
case eSectionTypeDataCStringPointers:
case eSectionTypeDataSymbolAddress:
case eSectionTypeData4:
case eSectionTypeData8:
case eSectionTypeData16:
case eSectionTypeDataPointers:
case eSectionTypeZeroFill:
case eSectionTypeDataObjCMessageRefs:
case eSectionTypeDataObjCCFStrings:
case eSectionTypeGoSymtab:
return AddressClass::eData;
case eSectionTypeDebug:
case eSectionTypeDWARFDebugAbbrev:
case eSectionTypeDWARFDebugAbbrevDwo:
case eSectionTypeDWARFDebugAddr:
case eSectionTypeDWARFDebugAranges:
case eSectionTypeDWARFDebugCuIndex:
case eSectionTypeDWARFDebugFrame:
case eSectionTypeDWARFDebugInfo:
case eSectionTypeDWARFDebugInfoDwo:
case eSectionTypeDWARFDebugLine:
case eSectionTypeDWARFDebugLineStr:
case eSectionTypeDWARFDebugLoc:
case eSectionTypeDWARFDebugLocDwo:
case eSectionTypeDWARFDebugLocLists:
case eSectionTypeDWARFDebugLocListsDwo:
case eSectionTypeDWARFDebugMacInfo:
case eSectionTypeDWARFDebugMacro:
case eSectionTypeDWARFDebugNames:
case eSectionTypeDWARFDebugPubNames:
case eSectionTypeDWARFDebugPubTypes:
case eSectionTypeDWARFDebugRanges:
case eSectionTypeDWARFDebugRngLists:
case eSectionTypeDWARFDebugRngListsDwo:
case eSectionTypeDWARFDebugStr:
case eSectionTypeDWARFDebugStrDwo:
case eSectionTypeDWARFDebugStrOffsets:
case eSectionTypeDWARFDebugStrOffsetsDwo:
case eSectionTypeDWARFDebugTuIndex:
case eSectionTypeDWARFDebugTypes:
case eSectionTypeDWARFDebugTypesDwo:
case eSectionTypeDWARFAppleNames:
case eSectionTypeDWARFAppleTypes:
case eSectionTypeDWARFAppleNamespaces:
case eSectionTypeDWARFAppleObjC:
case eSectionTypeDWARFGNUDebugAltLink:
case eSectionTypeCTF:
case eSectionTypeLLDBFormatters:
case eSectionTypeLLDBTypeSummaries:
case eSectionTypeSwiftModules:
return AddressClass::eDebug;
case eSectionTypeEHFrame:
case eSectionTypeARMexidx:
case eSectionTypeARMextab:
case eSectionTypeCompactUnwind:
return AddressClass::eRuntime;
case eSectionTypeELFSymbolTable:
case eSectionTypeELFDynamicSymbols:
case eSectionTypeELFRelocationEntries:
case eSectionTypeELFDynamicLinkInfo:
case eSectionTypeWasmName:
case eSectionTypeOther:
return AddressClass::eUnknown;
case eSectionTypeAbsoluteAddress:
// In case of absolute sections decide the address class based on
// the symbol type because the section type isn't specify if it is
// a code or a data section.
break;
}
}
}
const SymbolType symbol_type = symbol->GetType();
switch (symbol_type) {
case eSymbolTypeAny:
return AddressClass::eUnknown;
case eSymbolTypeAbsolute:
return AddressClass::eUnknown;
case eSymbolTypeCode:
return AddressClass::eCode;
case eSymbolTypeTrampoline:
return AddressClass::eCode;
case eSymbolTypeResolver:
return AddressClass::eCode;
case eSymbolTypeData:
return AddressClass::eData;
case eSymbolTypeRuntime:
return AddressClass::eRuntime;
case eSymbolTypeException:
return AddressClass::eRuntime;
case eSymbolTypeSourceFile:
return AddressClass::eDebug;
case eSymbolTypeHeaderFile:
return AddressClass::eDebug;
case eSymbolTypeObjectFile:
return AddressClass::eDebug;
case eSymbolTypeCommonBlock:
return AddressClass::eDebug;
case eSymbolTypeBlock:
return AddressClass::eDebug;
case eSymbolTypeLocal:
return AddressClass::eData;
case eSymbolTypeParam:
return AddressClass::eData;
case eSymbolTypeVariable:
return AddressClass::eData;
case eSymbolTypeVariableType:
return AddressClass::eDebug;
case eSymbolTypeLineEntry:
return AddressClass::eDebug;
case eSymbolTypeLineHeader:
return AddressClass::eDebug;
case eSymbolTypeScopeBegin:
return AddressClass::eDebug;
case eSymbolTypeScopeEnd:
return AddressClass::eDebug;
case eSymbolTypeAdditional:
return AddressClass::eUnknown;
case eSymbolTypeCompiler:
return AddressClass::eDebug;
case eSymbolTypeInstrumentation:
return AddressClass::eDebug;
case eSymbolTypeUndefined:
return AddressClass::eUnknown;
case eSymbolTypeObjCClass:
return AddressClass::eRuntime;
case eSymbolTypeObjCMetaClass:
return AddressClass::eRuntime;
case eSymbolTypeObjCIVar:
return AddressClass::eRuntime;
case eSymbolTypeReExported:
return AddressClass::eRuntime;
}
}
}
return AddressClass::eUnknown;
}
WritableDataBufferSP ObjectFile::ReadMemory(const ProcessSP &process_sp,
lldb::addr_t addr,
size_t byte_size) {
WritableDataBufferSP data_sp;
if (process_sp) {
std::unique_ptr<DataBufferHeap> data_up(new DataBufferHeap(byte_size, 0));
Status error;
const size_t bytes_read = process_sp->ReadMemory(
addr, data_up->GetBytes(), data_up->GetByteSize(), error);
if (bytes_read == byte_size)
data_sp.reset(data_up.release());
}
return data_sp;
}
size_t ObjectFile::GetData(lldb::offset_t offset, size_t length,
DataExtractor &data) const {
// The entire file has already been mmap'ed into m_data, so just copy from
// there as the back mmap buffer will be shared with shared pointers.
return data.SetData(m_data, offset, length);
}
size_t ObjectFile::CopyData(lldb::offset_t offset, size_t length,
void *dst) const {
// The entire file has already been mmap'ed into m_data, so just copy from
// there Note that the data remains in target byte order.
return m_data.CopyData(offset, length, dst);
}
size_t ObjectFile::ReadSectionData(Section *section,
lldb::offset_t section_offset, void *dst,
size_t dst_len) {
assert(section);
section_offset *= section->GetTargetByteSize();
// If some other objectfile owns this data, pass this to them.
if (section->GetObjectFile() != this)
return section->GetObjectFile()->ReadSectionData(section, section_offset,
dst, dst_len);
if (!section->IsRelocated())
RelocateSection(section);
if (IsInMemory()) {
ProcessSP process_sp(m_process_wp.lock());
if (process_sp) {
Status error;
const addr_t base_load_addr =
section->GetLoadBaseAddress(&process_sp->GetTarget());
if (base_load_addr != LLDB_INVALID_ADDRESS)
return process_sp->ReadMemory(base_load_addr + section_offset, dst,
dst_len, error);
}
} else {
const lldb::offset_t section_file_size = section->GetFileSize();
if (section_offset < section_file_size) {
const size_t section_bytes_left = section_file_size - section_offset;
size_t section_dst_len = dst_len;
if (section_dst_len > section_bytes_left)
section_dst_len = section_bytes_left;
return CopyData(section->GetFileOffset() + section_offset,
section_dst_len, dst);
} else {
if (section->GetType() == eSectionTypeZeroFill) {
const uint64_t section_size = section->GetByteSize();
const uint64_t section_bytes_left = section_size - section_offset;
uint64_t section_dst_len = dst_len;
if (section_dst_len > section_bytes_left)
section_dst_len = section_bytes_left;
memset(dst, 0, section_dst_len);
return section_dst_len;
}
}
}
return 0;
}
// Get the section data the file on disk
size_t ObjectFile::ReadSectionData(Section *section,
DataExtractor &section_data) {
// If some other objectfile owns this data, pass this to them.
if (section->GetObjectFile() != this)
return section->GetObjectFile()->ReadSectionData(section, section_data);
if (!section->IsRelocated())
RelocateSection(section);
if (IsInMemory()) {
ProcessSP process_sp(m_process_wp.lock());
if (process_sp) {
const addr_t base_load_addr =
section->GetLoadBaseAddress(&process_sp->GetTarget());
if (base_load_addr != LLDB_INVALID_ADDRESS) {
DataBufferSP data_sp(
ReadMemory(process_sp, base_load_addr, section->GetByteSize()));
if (data_sp) {
section_data.SetData(data_sp, 0, data_sp->GetByteSize());
section_data.SetByteOrder(process_sp->GetByteOrder());
section_data.SetAddressByteSize(process_sp->GetAddressByteSize());
return section_data.GetByteSize();
}
}
}
}
// The object file now contains a full mmap'ed copy of the object file
// data, so just use this
return GetData(section->GetFileOffset(), GetSectionDataSize(section),
section_data);
}
bool ObjectFile::SplitArchivePathWithObject(llvm::StringRef path_with_object,
FileSpec &archive_file,
ConstString &archive_object,
bool must_exist) {
size_t len = path_with_object.size();
if (len < 2 || path_with_object.back() != ')')
return false;
llvm::StringRef archive = path_with_object.substr(0, path_with_object.rfind('('));
if (archive.empty())
return false;
llvm::StringRef object = path_with_object.substr(archive.size() + 1).drop_back();
archive_file.SetFile(archive, FileSpec::Style::native);
if (must_exist && !FileSystem::Instance().Exists(archive_file))
return false;
archive_object.SetString(object);
return true;
}
void ObjectFile::ClearSymtab() {
ModuleSP module_sp(GetModule());
if (module_sp) {
Log *log = GetLog(LLDBLog::Object);
LLDB_LOGF(log, "%p ObjectFile::ClearSymtab () symtab = %p",
static_cast<void *>(this),
static_cast<void *>(m_symtab_up.get()));
// Since we need to clear the symbol table, we need a new llvm::once_flag
// instance so we can safely create another symbol table
m_symtab_once_up.reset(new llvm::once_flag());
m_symtab_up.reset();
}
}
SectionList *ObjectFile::GetSectionList(bool update_module_section_list) {
if (m_sections_up == nullptr) {
if (update_module_section_list) {
ModuleSP module_sp(GetModule());
if (module_sp) {
std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
CreateSections(*module_sp->GetUnifiedSectionList());
}
} else {
SectionList unified_section_list;
CreateSections(unified_section_list);
}
}
return m_sections_up.get();
}
lldb::SymbolType
ObjectFile::GetSymbolTypeFromName(llvm::StringRef name,
lldb::SymbolType symbol_type_hint) {
if (!name.empty()) {
if (name.starts_with("_OBJC_")) {
// ObjC
if (name.starts_with("_OBJC_CLASS_$_"))
return lldb::eSymbolTypeObjCClass;
if (name.starts_with("_OBJC_METACLASS_$_"))
return lldb::eSymbolTypeObjCMetaClass;
if (name.starts_with("_OBJC_IVAR_$_"))
return lldb::eSymbolTypeObjCIVar;
} else if (name.starts_with(".objc_class_name_")) {
// ObjC v1
return lldb::eSymbolTypeObjCClass;
}
}
return symbol_type_hint;
}
lldb::SectionType
ObjectFile::GetDWARFSectionTypeFromName(llvm::StringRef name) {
return llvm::StringSwitch<SectionType>(name)
.Case("abbrev", eSectionTypeDWARFDebugAbbrev)
.Case("abbrev.dwo", eSectionTypeDWARFDebugAbbrevDwo)
.Case("addr", eSectionTypeDWARFDebugAddr)
.Case("aranges", eSectionTypeDWARFDebugAranges)
.Case("cu_index", eSectionTypeDWARFDebugCuIndex)
.Case("frame", eSectionTypeDWARFDebugFrame)
.Case("info", eSectionTypeDWARFDebugInfo)
.Case("info.dwo", eSectionTypeDWARFDebugInfoDwo)
.Cases("line", "line.dwo", eSectionTypeDWARFDebugLine)
.Cases("line_str", "line_str.dwo", eSectionTypeDWARFDebugLineStr)
.Case("loc", eSectionTypeDWARFDebugLoc)
.Case("loc.dwo", eSectionTypeDWARFDebugLocDwo)
.Case("loclists", eSectionTypeDWARFDebugLocLists)
.Case("loclists.dwo", eSectionTypeDWARFDebugLocListsDwo)
.Case("macinfo", eSectionTypeDWARFDebugMacInfo)
.Cases("macro", "macro.dwo", eSectionTypeDWARFDebugMacro)
.Case("names", eSectionTypeDWARFDebugNames)
.Case("pubnames", eSectionTypeDWARFDebugPubNames)
.Case("pubtypes", eSectionTypeDWARFDebugPubTypes)
.Case("ranges", eSectionTypeDWARFDebugRanges)
.Case("rnglists", eSectionTypeDWARFDebugRngLists)
.Case("rnglists.dwo", eSectionTypeDWARFDebugRngListsDwo)
.Case("str", eSectionTypeDWARFDebugStr)
.Case("str.dwo", eSectionTypeDWARFDebugStrDwo)
.Case("str_offsets", eSectionTypeDWARFDebugStrOffsets)
.Case("str_offsets.dwo", eSectionTypeDWARFDebugStrOffsetsDwo)
.Case("tu_index", eSectionTypeDWARFDebugTuIndex)
.Case("types", eSectionTypeDWARFDebugTypes)
.Case("types.dwo", eSectionTypeDWARFDebugTypesDwo)
.Default(eSectionTypeOther);
}
std::vector<ObjectFile::LoadableData>
ObjectFile::GetLoadableData(Target &target) {
std::vector<LoadableData> loadables;
SectionList *section_list = GetSectionList();
if (!section_list)
return loadables;
// Create a list of loadable data from loadable sections
size_t section_count = section_list->GetNumSections(0);
for (size_t i = 0; i < section_count; ++i) {
LoadableData loadable;
SectionSP section_sp = section_list->GetSectionAtIndex(i);
loadable.Dest = target.GetSectionLoadAddress(section_sp);
if (loadable.Dest == LLDB_INVALID_ADDRESS)
continue;
// We can skip sections like bss
if (section_sp->GetFileSize() == 0)
continue;
DataExtractor section_data;
section_sp->GetSectionData(section_data);
loadable.Contents = llvm::ArrayRef<uint8_t>(section_data.GetDataStart(),
section_data.GetByteSize());
loadables.push_back(loadable);
}
return loadables;
}
std::unique_ptr<CallFrameInfo> ObjectFile::CreateCallFrameInfo() {
return {};
}
void ObjectFile::RelocateSection(lldb_private::Section *section)
{
}
DataBufferSP ObjectFile::MapFileData(const FileSpec &file, uint64_t Size,
uint64_t Offset) {
return FileSystem::Instance().CreateDataBuffer(file.GetPath(), Size, Offset);
}
void llvm::format_provider<ObjectFile::Type>::format(
const ObjectFile::Type &type, raw_ostream &OS, StringRef Style) {
switch (type) {
case ObjectFile::eTypeInvalid:
OS << "invalid";
break;
case ObjectFile::eTypeCoreFile:
OS << "core file";
break;
case ObjectFile::eTypeExecutable:
OS << "executable";
break;
case ObjectFile::eTypeDebugInfo:
OS << "debug info";
break;
case ObjectFile::eTypeDynamicLinker:
OS << "dynamic linker";
break;
case ObjectFile::eTypeObjectFile:
OS << "object file";
break;
case ObjectFile::eTypeSharedLibrary:
OS << "shared library";
break;
case ObjectFile::eTypeStubLibrary:
OS << "stub library";
break;
case ObjectFile::eTypeJIT:
OS << "jit";
break;
case ObjectFile::eTypeUnknown:
OS << "unknown";
break;
}
}
void llvm::format_provider<ObjectFile::Strata>::format(
const ObjectFile::Strata &strata, raw_ostream &OS, StringRef Style) {
switch (strata) {
case ObjectFile::eStrataInvalid:
OS << "invalid";
break;
case ObjectFile::eStrataUnknown:
OS << "unknown";
break;
case ObjectFile::eStrataUser:
OS << "user";
break;
case ObjectFile::eStrataKernel:
OS << "kernel";
break;
case ObjectFile::eStrataRawImage:
OS << "raw image";
break;
case ObjectFile::eStrataJIT:
OS << "jit";
break;
}
}
Symtab *ObjectFile::GetSymtab(bool can_create) {
ModuleSP module_sp(GetModule());
if (module_sp && can_create) {
// We can't take the module lock in ObjectFile::GetSymtab() or we can
// deadlock in DWARF indexing when any file asks for the symbol table from
// an object file. This currently happens in the preloading of symbols in
// SymbolFileDWARF::PreloadSymbols() because the main thread will take the
// module lock, and then threads will be spun up to index the DWARF and
// any of those threads might end up trying to relocate items in the DWARF
// sections which causes ObjectFile::GetSectionData(...) to relocate section
// data which requires the symbol table.
//
// So to work around this, we create the symbol table one time using
// llvm::once_flag, lock it, and then set the unique pointer. Any other
// thread that gets ahold of the symbol table before parsing is done, will
// not be able to access the symbol table contents since all APIs in Symtab
// are protected by a mutex in the Symtab object itself.
llvm::call_once(*m_symtab_once_up, [&]() {
Symtab *symtab = new Symtab(this);
std::lock_guard<std::recursive_mutex> symtab_guard(symtab->GetMutex());
m_symtab_up.reset(symtab);
if (!m_symtab_up->LoadFromCache()) {
ElapsedTime elapsed(module_sp->GetSymtabParseTime());
ParseSymtab(*m_symtab_up);
m_symtab_up->Finalize();
}
});
}
return m_symtab_up.get();
}
uint32_t ObjectFile::GetCacheHash() {
if (m_cache_hash)
return *m_cache_hash;
StreamString strm;
strm.Format("{0}-{1}-{2}", m_file, GetType(), GetStrata());
m_cache_hash = llvm::djbHash(strm.GetString());
return *m_cache_hash;
}
std::string ObjectFile::GetObjectName() const {
if (ModuleSP module_sp = GetModule())
if (ConstString object_name = module_sp->GetObjectName())
return llvm::formatv("{0}({1})", GetFileSpec().GetFilename().GetString(),
object_name.GetString())
.str();
return GetFileSpec().GetFilename().GetString();
}
namespace llvm {
namespace json {
bool fromJSON(const llvm::json::Value &value,
lldb_private::ObjectFile::Type &type, llvm::json::Path path) {
if (auto str = value.getAsString()) {
type = llvm::StringSwitch<ObjectFile::Type>(*str)
.Case("corefile", ObjectFile::eTypeCoreFile)
.Case("executable", ObjectFile::eTypeExecutable)
.Case("debuginfo", ObjectFile::eTypeDebugInfo)
.Case("dynamiclinker", ObjectFile::eTypeDynamicLinker)
.Case("objectfile", ObjectFile::eTypeObjectFile)
.Case("sharedlibrary", ObjectFile::eTypeSharedLibrary)
.Case("stublibrary", ObjectFile::eTypeStubLibrary)
.Case("jit", ObjectFile::eTypeJIT)
.Case("unknown", ObjectFile::eTypeUnknown)
.Default(ObjectFile::eTypeInvalid);
if (type == ObjectFile::eTypeInvalid) {
path.report("invalid object type");
return false;
}
return true;
}
path.report("expected string");
return false;
}
} // namespace json
} // namespace llvm
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