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llvm-project/lldb/source/Plugins/SymbolFile/PDB/SymbolFilePDB.cpp

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//===-- SymbolFilePDB.cpp ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "SymbolFilePDB.h"
#include "clang/Lex/Lexer.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/LineTable.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/TypeMap.h"
#include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
#include "llvm/DebugInfo/PDB/IPDBLineNumber.h"
#include "llvm/DebugInfo/PDB/IPDBSourceFile.h"
#include "llvm/DebugInfo/PDB/PDBSymbol.h"
#include "llvm/DebugInfo/PDB/PDBSymbolCompiland.h"
#include "llvm/DebugInfo/PDB/PDBSymbolCompilandDetails.h"
#include "llvm/DebugInfo/PDB/PDBSymbolExe.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFuncDebugEnd.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFuncDebugStart.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeEnum.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeTypedef.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"
#include "Plugins/SymbolFile/PDB/PDBASTParser.h"
#include <regex>
using namespace lldb_private;
namespace
{
lldb::LanguageType TranslateLanguage(llvm::PDB_Lang lang)
{
switch (lang)
{
case llvm::PDB_Lang::Cpp:
return lldb::LanguageType::eLanguageTypeC_plus_plus;
case llvm::PDB_Lang::C:
return lldb::LanguageType::eLanguageTypeC;
default:
return lldb::LanguageType::eLanguageTypeUnknown;
}
}
bool
ShouldAddLine(uint32_t requested_line, uint32_t actual_line, uint32_t addr_length)
{
return ((requested_line == 0 || actual_line == requested_line) && addr_length > 0);
}
}
void
SymbolFilePDB::Initialize()
{
PluginManager::RegisterPlugin(GetPluginNameStatic(), GetPluginDescriptionStatic(), CreateInstance,
DebuggerInitialize);
}
void
SymbolFilePDB::Terminate()
{
PluginManager::UnregisterPlugin(CreateInstance);
}
void
SymbolFilePDB::DebuggerInitialize(lldb_private::Debugger &debugger)
{
}
lldb_private::ConstString
SymbolFilePDB::GetPluginNameStatic()
{
static ConstString g_name("pdb");
return g_name;
}
const char *
SymbolFilePDB::GetPluginDescriptionStatic()
{
return "Microsoft PDB debug symbol file reader.";
}
lldb_private::SymbolFile *
SymbolFilePDB::CreateInstance(lldb_private::ObjectFile *obj_file)
{
return new SymbolFilePDB(obj_file);
}
SymbolFilePDB::SymbolFilePDB(lldb_private::ObjectFile *object_file)
: SymbolFile(object_file), m_cached_compile_unit_count(0)
{
}
SymbolFilePDB::~SymbolFilePDB()
{
}
uint32_t
SymbolFilePDB::CalculateAbilities()
{
if (!m_session_up)
{
// Lazily load and match the PDB file, but only do this once.
std::string exePath = m_obj_file->GetFileSpec().GetPath();
auto error = llvm::loadDataForEXE(llvm::PDB_ReaderType::DIA, llvm::StringRef(exePath), m_session_up);
if (error != llvm::PDB_ErrorCode::Success)
return 0;
}
return CompileUnits | LineTables;
}
void
SymbolFilePDB::InitializeObject()
{
lldb::addr_t obj_load_address = m_obj_file->GetFileOffset();
m_session_up->setLoadAddress(obj_load_address);
TypeSystem *type_system = GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
ClangASTContext *clang_type_system = llvm::dyn_cast_or_null<ClangASTContext>(type_system);
m_tu_decl_ctx_up = llvm::make_unique<CompilerDeclContext>(type_system, clang_type_system->GetTranslationUnitDecl());
}
uint32_t
SymbolFilePDB::GetNumCompileUnits()
{
if (m_cached_compile_unit_count == 0)
{
auto global = m_session_up->getGlobalScope();
auto compilands = global->findAllChildren<llvm::PDBSymbolCompiland>();
m_cached_compile_unit_count = compilands->getChildCount();
// The linker can inject an additional "dummy" compilation unit into the PDB.
// Ignore this special compile unit for our purposes, if it is there. It is
// always the last one.
auto last_cu = compilands->getChildAtIndex(m_cached_compile_unit_count - 1);
std::string name = last_cu->getName();
if (name == "* Linker *")
--m_cached_compile_unit_count;
}
return m_cached_compile_unit_count;
}
lldb::CompUnitSP
SymbolFilePDB::ParseCompileUnitAtIndex(uint32_t index)
{
auto global = m_session_up->getGlobalScope();
auto compilands = global->findAllChildren<llvm::PDBSymbolCompiland>();
auto cu = compilands->getChildAtIndex(index);
uint32_t id = cu->getSymIndexId();
return ParseCompileUnitForSymIndex(id);
}
lldb::LanguageType
SymbolFilePDB::ParseCompileUnitLanguage(const lldb_private::SymbolContext &sc)
{
// What fields should I expect to be filled out on the SymbolContext? Is it
// safe to assume that `sc.comp_unit` is valid?
if (!sc.comp_unit)
return lldb::eLanguageTypeUnknown;
auto cu = m_session_up->getConcreteSymbolById<llvm::PDBSymbolCompiland>(sc.comp_unit->GetID());
if (!cu)
return lldb::eLanguageTypeUnknown;
auto details = cu->findOneChild<llvm::PDBSymbolCompilandDetails>();
if (!details)
return lldb::eLanguageTypeUnknown;
return TranslateLanguage(details->getLanguage());
}
size_t
SymbolFilePDB::ParseCompileUnitFunctions(const lldb_private::SymbolContext &sc)
{
// TODO: Implement this
return size_t();
}
bool
SymbolFilePDB::ParseCompileUnitLineTable(const lldb_private::SymbolContext &sc)
{
return ParseCompileUnitLineTable(sc, 0);
}
bool
SymbolFilePDB::ParseCompileUnitDebugMacros(const lldb_private::SymbolContext &sc)
{
// PDB doesn't contain information about macros
return false;
}
bool
SymbolFilePDB::ParseCompileUnitSupportFiles(const lldb_private::SymbolContext &sc,
lldb_private::FileSpecList &support_files)
{
if (!sc.comp_unit)
return false;
// In theory this is unnecessary work for us, because all of this information is easily
// (and quickly) accessible from DebugInfoPDB, so caching it a second time seems like a waste.
// Unfortunately, there's no good way around this short of a moderate refactor, since SymbolVendor
// depends on being able to cache this list.
auto cu = m_session_up->getConcreteSymbolById<llvm::PDBSymbolCompiland>(sc.comp_unit->GetID());
if (!cu)
return false;
auto files = m_session_up->getSourceFilesForCompiland(*cu);
if (!files || files->getChildCount() == 0)
return false;
while (auto file = files->getNext())
{
FileSpec spec(file->getFileName(), false);
support_files.Append(spec);
}
return true;
}
bool
SymbolFilePDB::ParseImportedModules(const lldb_private::SymbolContext &sc,
std::vector<lldb_private::ConstString> &imported_modules)
{
// PDB does not yet support module debug info
return false;
}
size_t
SymbolFilePDB::ParseFunctionBlocks(const lldb_private::SymbolContext &sc)
{
// TODO: Implement this
return size_t();
}
size_t
SymbolFilePDB::ParseTypes(const lldb_private::SymbolContext &sc)
{
// TODO: Implement this
return size_t();
}
size_t
SymbolFilePDB::ParseVariablesForContext(const lldb_private::SymbolContext &sc)
{
// TODO: Implement this
return size_t();
}
lldb_private::Type *
SymbolFilePDB::ResolveTypeUID(lldb::user_id_t type_uid)
{
auto find_result = m_types.find(type_uid);
if (find_result != m_types.end())
return find_result->second.get();
TypeSystem *type_system = GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
ClangASTContext *clang_type_system = llvm::dyn_cast_or_null<ClangASTContext>(type_system);
if (!clang_type_system)
return nullptr;
PDBASTParser *pdb = llvm::dyn_cast<PDBASTParser>(clang_type_system->GetPDBParser());
if (!pdb)
return nullptr;
auto pdb_type = m_session_up->getSymbolById(type_uid);
if (pdb_type == nullptr)
return nullptr;
lldb::TypeSP result = pdb->CreateLLDBTypeFromPDBType(*pdb_type);
m_types.insert(std::make_pair(type_uid, result));
return result.get();
}
bool
SymbolFilePDB::CompleteType(lldb_private::CompilerType &compiler_type)
{
// TODO: Implement this
return false;
}
lldb_private::CompilerDecl
SymbolFilePDB::GetDeclForUID(lldb::user_id_t uid)
{
return lldb_private::CompilerDecl();
}
lldb_private::CompilerDeclContext
SymbolFilePDB::GetDeclContextForUID(lldb::user_id_t uid)
{
// PDB always uses the translation unit decl context for everything. We can improve this later
// but it's not easy because PDB doesn't provide a high enough level of type fidelity in this area.
return *m_tu_decl_ctx_up;
}
lldb_private::CompilerDeclContext
SymbolFilePDB::GetDeclContextContainingUID(lldb::user_id_t uid)
{
return *m_tu_decl_ctx_up;
}
void
SymbolFilePDB::ParseDeclsForContext(lldb_private::CompilerDeclContext decl_ctx)
{
}
uint32_t
SymbolFilePDB::ResolveSymbolContext(const lldb_private::Address &so_addr, uint32_t resolve_scope,
lldb_private::SymbolContext &sc)
{
return uint32_t();
}
uint32_t
SymbolFilePDB::ResolveSymbolContext(const lldb_private::FileSpec &file_spec, uint32_t line, bool check_inlines,
uint32_t resolve_scope, lldb_private::SymbolContextList &sc_list)
{
if (resolve_scope & lldb::eSymbolContextCompUnit)
{
// Locate all compilation units with line numbers referencing the specified file. For example, if
// `file_spec` is <vector>, then this should return all source files and header files that reference
// <vector>, either directly or indirectly.
auto compilands =
m_session_up->findCompilandsForSourceFile(file_spec.GetPath(), llvm::PDB_NameSearchFlags::NS_CaseInsensitive);
// For each one, either find get its previously parsed data, or parse it afresh and add it to
// the symbol context list.
while (auto compiland = compilands->getNext())
{
// If we're not checking inlines, then don't add line information for this file unless the FileSpec
// matches.
if (!check_inlines)
{
// `getSourceFileName` returns the basename of the original source file used to generate this compiland.
// It does not return the full path. Currently the only way to get that is to do a basename lookup to
// get the IPDBSourceFile, but this is ambiguous in the case of two source files with the same name
// contributing to the same compiland. This is a moderately extreme edge case, so we consider this ok
// for now, although we need to find a long term solution.
std::string source_file = compiland->getSourceFileName();
auto pdb_file = m_session_up->findOneSourceFile(compiland.get(), source_file,
llvm::PDB_NameSearchFlags::NS_CaseInsensitive);
source_file = pdb_file->getFileName();
FileSpec this_spec(source_file, false, FileSpec::ePathSyntaxWindows);
if (!file_spec.FileEquals(this_spec))
continue;
}
SymbolContext sc;
auto cu = ParseCompileUnitForSymIndex(compiland->getSymIndexId());
sc.comp_unit = cu.get();
sc.module_sp = cu->GetModule();
sc_list.Append(sc);
// If we were asked to resolve line entries, add all entries to the line table that match the requested
// line (or all lines if `line` == 0)
if (resolve_scope & lldb::eSymbolContextLineEntry)
ParseCompileUnitLineTable(sc, line);
}
}
return sc_list.GetSize();
}
uint32_t
SymbolFilePDB::FindGlobalVariables(const lldb_private::ConstString &name,
const lldb_private::CompilerDeclContext *parent_decl_ctx, bool append,
uint32_t max_matches, lldb_private::VariableList &variables)
{
return uint32_t();
}
uint32_t
SymbolFilePDB::FindGlobalVariables(const lldb_private::RegularExpression &regex, bool append, uint32_t max_matches,
lldb_private::VariableList &variables)
{
return uint32_t();
}
uint32_t
SymbolFilePDB::FindFunctions(const lldb_private::ConstString &name,
const lldb_private::CompilerDeclContext *parent_decl_ctx, uint32_t name_type_mask,
bool include_inlines, bool append, lldb_private::SymbolContextList &sc_list)
{
return uint32_t();
}
uint32_t
SymbolFilePDB::FindFunctions(const lldb_private::RegularExpression &regex, bool include_inlines, bool append,
lldb_private::SymbolContextList &sc_list)
{
return uint32_t();
}
void
SymbolFilePDB::GetMangledNamesForFunction(const std::string &scope_qualified_name,
std::vector<lldb_private::ConstString> &mangled_names)
{
}
uint32_t
SymbolFilePDB::FindTypes(const lldb_private::SymbolContext &sc, const lldb_private::ConstString &name,
const lldb_private::CompilerDeclContext *parent_decl_ctx, bool append, uint32_t max_matches,
llvm::DenseSet<lldb_private::SymbolFile *> &searched_symbol_files,
lldb_private::TypeMap &types)
{
if (!append)
types.Clear();
if (!name)
return 0;
searched_symbol_files.clear();
searched_symbol_files.insert(this);
std::string name_str = name.AsCString();
// If this might be a regex, we have to return EVERY symbol and process them one by one, which is going
// to destroy performance on large PDB files. So try really hard not to use a regex match.
if (name_str.find_first_of("[]?*.-+\\") != std::string::npos)
FindTypesByRegex(name_str, max_matches, types);
else
FindTypesByName(name_str, max_matches, types);
return types.GetSize();
}
void
SymbolFilePDB::FindTypesByRegex(const std::string &regex, uint32_t max_matches, lldb_private::TypeMap &types)
{
// When searching by regex, we need to go out of our way to limit the search space as much as possible, since
// the way this is implemented is by searching EVERYTHING in the PDB and manually doing a regex compare. PDB
// library isn't optimized for regex searches or searches across multiple symbol types at the same time, so the
// best we can do is to search enums, then typedefs, then classes one by one, and do a regex compare against all
// of them.
llvm::PDB_SymType tags_to_search[] = {llvm::PDB_SymType::Enum, llvm::PDB_SymType::Typedef, llvm::PDB_SymType::UDT};
auto global = m_session_up->getGlobalScope();
std::unique_ptr<llvm::IPDBEnumSymbols> results;
std::regex re(regex);
uint32_t matches = 0;
for (auto tag : tags_to_search)
{
results = global->findAllChildren(tag);
while (auto result = results->getNext())
{
if (max_matches > 0 && matches >= max_matches)
break;
std::string type_name;
if (auto enum_type = llvm::dyn_cast<llvm::PDBSymbolTypeEnum>(result.get()))
type_name = enum_type->getName();
else if (auto typedef_type = llvm::dyn_cast<llvm::PDBSymbolTypeTypedef>(result.get()))
type_name = typedef_type->getName();
else if (auto class_type = llvm::dyn_cast<llvm::PDBSymbolTypeUDT>(result.get()))
type_name = class_type->getName();
else
{
// We're only looking for types that have names. Skip symbols, as well as
// unnamed types such as arrays, pointers, etc.
continue;
}
if (!std::regex_match(type_name, re))
continue;
// This should cause the type to get cached and stored in the `m_types` lookup.
if (!ResolveTypeUID(result->getSymIndexId()))
continue;
auto iter = m_types.find(result->getSymIndexId());
if (iter == m_types.end())
continue;
types.Insert(iter->second);
++matches;
}
}
}
void
SymbolFilePDB::FindTypesByName(const std::string &name, uint32_t max_matches, lldb_private::TypeMap &types)
{
auto global = m_session_up->getGlobalScope();
std::unique_ptr<llvm::IPDBEnumSymbols> results;
results = global->findChildren(llvm::PDB_SymType::None, name.c_str(), llvm::PDB_NameSearchFlags::NS_Default);
uint32_t matches = 0;
while (auto result = results->getNext())
{
if (max_matches > 0 && matches >= max_matches)
break;
switch (result->getSymTag())
{
case llvm::PDB_SymType::Enum:
case llvm::PDB_SymType::UDT:
case llvm::PDB_SymType::Typedef:
break;
default:
// We're only looking for types that have names. Skip symbols, as well as
// unnamed types such as arrays, pointers, etc.
continue;
}
// This should cause the type to get cached and stored in the `m_types` lookup.
if (!ResolveTypeUID(result->getSymIndexId()))
continue;
auto iter = m_types.find(result->getSymIndexId());
if (iter == m_types.end())
continue;
types.Insert(iter->second);
++matches;
}
}
size_t
SymbolFilePDB::FindTypes(const std::vector<lldb_private::CompilerContext> &contexts, bool append,
lldb_private::TypeMap &types)
{
return 0;
}
lldb_private::TypeList *
SymbolFilePDB::GetTypeList()
{
return nullptr;
}
size_t
SymbolFilePDB::GetTypes(lldb_private::SymbolContextScope *sc_scope, uint32_t type_mask,
lldb_private::TypeList &type_list)
{
return size_t();
}
lldb_private::TypeSystem *
SymbolFilePDB::GetTypeSystemForLanguage(lldb::LanguageType language)
{
auto type_system = m_obj_file->GetModule()->GetTypeSystemForLanguage(language);
if (type_system)
type_system->SetSymbolFile(this);
return type_system;
}
lldb_private::CompilerDeclContext
SymbolFilePDB::FindNamespace(const lldb_private::SymbolContext &sc, const lldb_private::ConstString &name,
const lldb_private::CompilerDeclContext *parent_decl_ctx)
{
return lldb_private::CompilerDeclContext();
}
lldb_private::ConstString
SymbolFilePDB::GetPluginName()
{
static ConstString g_name("pdb");
return g_name;
}
uint32_t
SymbolFilePDB::GetPluginVersion()
{
return 1;
}
llvm::IPDBSession &
SymbolFilePDB::GetPDBSession()
{
return *m_session_up;
}
const llvm::IPDBSession &
SymbolFilePDB::GetPDBSession() const
{
return *m_session_up;
}
lldb::CompUnitSP
SymbolFilePDB::ParseCompileUnitForSymIndex(uint32_t id)
{
auto found_cu = m_comp_units.find(id);
if (found_cu != m_comp_units.end())
return found_cu->second;
auto cu = m_session_up->getConcreteSymbolById<llvm::PDBSymbolCompiland>(id);
// `getSourceFileName` returns the basename of the original source file used to generate this compiland. It does
// not return the full path. Currently the only way to get that is to do a basename lookup to get the
// IPDBSourceFile, but this is ambiguous in the case of two source files with the same name contributing to the
// same compiland. This is a moderately extreme edge case, so we consider this ok for now, although we need to find
// a long term solution.
auto file = m_session_up->findOneSourceFile(cu.get(), cu->getSourceFileName(),
llvm::PDB_NameSearchFlags::NS_CaseInsensitive);
std::string path = file->getFileName();
lldb::LanguageType lang;
auto details = cu->findOneChild<llvm::PDBSymbolCompilandDetails>();
if (!details)
lang = lldb::eLanguageTypeC_plus_plus;
else
lang = TranslateLanguage(details->getLanguage());
// Don't support optimized code for now, DebugInfoPDB does not return this information.
bool optimized = false;
auto result = std::make_shared<CompileUnit>(m_obj_file->GetModule(), nullptr, path.c_str(), id, lang, optimized);
m_comp_units.insert(std::make_pair(id, result));
return result;
}
bool
SymbolFilePDB::ParseCompileUnitLineTable(const lldb_private::SymbolContext &sc, uint32_t match_line)
{
auto global = m_session_up->getGlobalScope();
auto cu = m_session_up->getConcreteSymbolById<llvm::PDBSymbolCompiland>(sc.comp_unit->GetID());
// LineEntry needs the *index* of the file into the list of support files returned by
// ParseCompileUnitSupportFiles. But the underlying SDK gives us a globally unique
// idenfitifier in the namespace of the PDB. So, we have to do a mapping so that we
// can hand out indices.
llvm::DenseMap<uint32_t, uint32_t> index_map;
BuildSupportFileIdToSupportFileIndexMap(*cu, index_map);
auto line_table = llvm::make_unique<LineTable>(sc.comp_unit);
// Find contributions to `cu` from all source and header files.
std::string path = sc.comp_unit->GetPath();
auto files = m_session_up->getSourceFilesForCompiland(*cu);
// For each source and header file, create a LineSequence for contributions to the cu
// from that file, and add the sequence.
while (auto file = files->getNext())
{
std::unique_ptr<LineSequence> sequence(line_table->CreateLineSequenceContainer());
auto lines = m_session_up->findLineNumbers(*cu, *file);
int entry_count = lines->getChildCount();
uint64_t prev_addr;
uint32_t prev_length;
uint32_t prev_line;
uint32_t prev_source_idx;
for (int i = 0; i < entry_count; ++i)
{
auto line = lines->getChildAtIndex(i);
uint64_t lno = line->getLineNumber();
uint64_t addr = line->getVirtualAddress();
uint32_t length = line->getLength();
uint32_t source_id = line->getSourceFileId();
uint32_t col = line->getColumnNumber();
uint32_t source_idx = index_map[source_id];
// There was a gap between the current entry and the previous entry if the addresses don't perfectly line
// up.
bool is_gap = (i > 0) && (prev_addr + prev_length < addr);
// Before inserting the current entry, insert a terminal entry at the end of the previous entry's address
// range if the current entry resulted in a gap from the previous entry.
if (is_gap && ShouldAddLine(match_line, prev_line, prev_length))
{
line_table->AppendLineEntryToSequence(sequence.get(), prev_addr + prev_length, prev_line, 0,
prev_source_idx, false, false, false, false, true);
}
if (ShouldAddLine(match_line, lno, length))
{
bool is_statement = line->isStatement();
bool is_prologue = false;
bool is_epilogue = false;
auto func = m_session_up->findSymbolByAddress(addr, llvm::PDB_SymType::Function);
if (func)
{
auto prologue = func->findOneChild<llvm::PDBSymbolFuncDebugStart>();
is_prologue = (addr == prologue->getVirtualAddress());
auto epilogue = func->findOneChild<llvm::PDBSymbolFuncDebugEnd>();
is_epilogue = (addr == epilogue->getVirtualAddress());
}
line_table->AppendLineEntryToSequence(sequence.get(), addr, lno, col, source_idx, is_statement, false,
is_prologue, is_epilogue, false);
}
prev_addr = addr;
prev_length = length;
prev_line = lno;
prev_source_idx = source_idx;
}
if (entry_count > 0 && ShouldAddLine(match_line, prev_line, prev_length))
{
// The end is always a terminal entry, so insert it regardless.
line_table->AppendLineEntryToSequence(sequence.get(), prev_addr + prev_length, prev_line, 0,
prev_source_idx, false, false, false, false, true);
}
line_table->InsertSequence(sequence.release());
}
sc.comp_unit->SetLineTable(line_table.release());
return true;
}
void
SymbolFilePDB::BuildSupportFileIdToSupportFileIndexMap(const llvm::PDBSymbolCompiland &cu,
llvm::DenseMap<uint32_t, uint32_t> &index_map) const
{
// This is a hack, but we need to convert the source id into an index into the support
// files array. We don't want to do path comparisons to avoid basename / full path
// issues that may or may not even be a problem, so we use the globally unique source
// file identifiers. Ideally we could use the global identifiers everywhere, but LineEntry
// currently assumes indices.
auto source_files = m_session_up->getSourceFilesForCompiland(cu);
int index = 0;
while (auto file = source_files->getNext())
{
uint32_t source_id = file->getUniqueId();
index_map[source_id] = index++;
}
}
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