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//===-- CompileUnitIndex.cpp ------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#include "CompileUnitIndex.h"
#include "PdbIndex.h"
#include "PdbUtil.h"
#include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
#include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
#include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
#include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h"
#include "llvm/DebugInfo/PDB/Native/DbiStream.h"
#include "llvm/DebugInfo/PDB/Native/InfoStream.h"
#include "llvm/DebugInfo/PDB/Native/ModuleDebugStream.h"
#include "llvm/DebugInfo/PDB/Native/NamedStreamMap.h"
#include "llvm/DebugInfo/PDB/Native/TpiStream.h"
#include "llvm/Support/Path.h"
#include "lldb/Utility/LLDBAssert.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::npdb;
using namespace llvm::codeview;
using namespace llvm::pdb;
static bool IsMainFile(llvm::StringRef main, llvm::StringRef other) {
if (main == other)
return true;
// If the files refer to the local file system, we can just ask the file
// system if they're equivalent. But if the source isn't present on disk
// then we still want to try.
if (llvm::sys::fs::equivalent(main, other))
return true;
llvm::SmallString<64> normalized(other);
llvm::sys::path::native(normalized);
return main.equals_lower(normalized);
}
static void ParseCompile3(const CVSymbol &sym, CompilandIndexItem &cci) {
cci.m_compile_opts.emplace();
llvm::cantFail(
SymbolDeserializer::deserializeAs<Compile3Sym>(sym, *cci.m_compile_opts));
}
static void ParseObjname(const CVSymbol &sym, CompilandIndexItem &cci) {
cci.m_obj_name.emplace();
llvm::cantFail(
SymbolDeserializer::deserializeAs<ObjNameSym>(sym, *cci.m_obj_name));
}
static void ParseBuildInfo(PdbIndex &index, const CVSymbol &sym,
CompilandIndexItem &cci) {
BuildInfoSym bis(SymbolRecordKind::BuildInfoSym);
llvm::cantFail(SymbolDeserializer::deserializeAs<BuildInfoSym>(sym, bis));
// S_BUILDINFO just points to an LF_BUILDINFO in the IPI stream. Let's do
// a little extra work to pull out the LF_BUILDINFO.
LazyRandomTypeCollection &types = index.ipi().typeCollection();
llvm::Optional<CVType> cvt = types.tryGetType(bis.BuildId);
if (!cvt || cvt->kind() != LF_BUILDINFO)
return;
BuildInfoRecord bir;
llvm::cantFail(TypeDeserializer::deserializeAs<BuildInfoRecord>(*cvt, bir));
cci.m_build_info.assign(bir.ArgIndices.begin(), bir.ArgIndices.end());
}
static void ParseExtendedInfo(PdbIndex &index, CompilandIndexItem &item) {
const CVSymbolArray &syms = item.m_debug_stream.getSymbolArray();
// This is a private function, it shouldn't be called if the information
// has already been parsed.
lldbassert(!item.m_obj_name);
lldbassert(!item.m_compile_opts);
lldbassert(item.m_build_info.empty());
// We're looking for 3 things. S_COMPILE3, S_OBJNAME, and S_BUILDINFO.
int found = 0;
for (const CVSymbol &sym : syms) {
switch (sym.kind()) {
case S_COMPILE3:
ParseCompile3(sym, item);
break;
case S_OBJNAME:
ParseObjname(sym, item);
break;
case S_BUILDINFO:
ParseBuildInfo(index, sym, item);
break;
default:
continue;
}
if (++found >= 3)
break;
}
}
CompilandIndexItem::CompilandIndexItem(
PdbCompilandId id, llvm::pdb::ModuleDebugStreamRef debug_stream,
llvm::pdb::DbiModuleDescriptor descriptor)
: m_id(id), m_debug_stream(std::move(debug_stream)),
m_module_descriptor(std::move(descriptor)) {}
CompilandIndexItem &CompileUnitIndex::GetOrCreateCompiland(uint16_t modi) {
auto result = m_comp_units.try_emplace(modi, nullptr);
if (!result.second)
return *result.first->second;
// Find the module list and load its debug information stream and cache it
// since we need to use it for almost all interesting operations.
const DbiModuleList &modules = m_index.dbi().modules();
llvm::pdb::DbiModuleDescriptor descriptor = modules.getModuleDescriptor(modi);
uint16_t stream = descriptor.getModuleStreamIndex();
std::unique_ptr<llvm::msf::MappedBlockStream> stream_data =
m_index.pdb().createIndexedStream(stream);
llvm::pdb::ModuleDebugStreamRef debug_stream(descriptor,
std::move(stream_data));
cantFail(debug_stream.reload());
std::unique_ptr<CompilandIndexItem> &cci = result.first->second;
cci = llvm::make_unique<CompilandIndexItem>(
PdbCompilandId{modi}, std::move(debug_stream), std::move(descriptor));
ParseExtendedInfo(m_index, *cci);
cci->m_strings.initialize(debug_stream.getSubsectionsArray());
PDBStringTable &strings = cantFail(m_index.pdb().getStringTable());
cci->m_strings.setStrings(strings.getStringTable());
// We want the main source file to always comes first. Note that we can't
// just push_back the main file onto the front because `GetMainSourceFile`
// computes it in such a way that it doesn't own the resulting memory. So we
// have to iterate the module file list comparing each one to the main file
// name until we find it, and we can cache that one since the memory is backed
// by a contiguous chunk inside the mapped PDB.
llvm::SmallString<64> main_file = GetMainSourceFile(*cci);
std::string s = main_file.str();
llvm::sys::path::native(main_file);
uint32_t file_count = modules.getSourceFileCount(modi);
cci->m_file_list.reserve(file_count);
bool found_main_file = false;
for (llvm::StringRef file : modules.source_files(modi)) {
if (!found_main_file && IsMainFile(main_file, file)) {
cci->m_file_list.insert(cci->m_file_list.begin(), file);
found_main_file = true;
continue;
}
cci->m_file_list.push_back(file);
}
return *cci;
}
const CompilandIndexItem *CompileUnitIndex::GetCompiland(uint16_t modi) const {
auto iter = m_comp_units.find(modi);
if (iter == m_comp_units.end())
return nullptr;
return iter->second.get();
}
CompilandIndexItem *CompileUnitIndex::GetCompiland(uint16_t modi) {
auto iter = m_comp_units.find(modi);
if (iter == m_comp_units.end())
return nullptr;
return iter->second.get();
}
llvm::SmallString<64>
CompileUnitIndex::GetMainSourceFile(const CompilandIndexItem &item) const {
// LF_BUILDINFO contains a list of arg indices which point to LF_STRING_ID
// records in the IPI stream. The order of the arg indices is as follows:
// [0] - working directory where compiler was invoked.
// [1] - absolute path to compiler binary
// [2] - source file name
// [3] - path to compiler generated PDB (the /Zi PDB, although this entry gets
// added even when using /Z7)
// [4] - full command line invocation.
//
// We need to form the path [0]\[2] to generate the full path to the main
// file.source
if (item.m_build_info.size() < 3)
return {""};
LazyRandomTypeCollection &types = m_index.ipi().typeCollection();
StringIdRecord working_dir;
StringIdRecord file_name;
CVType dir_cvt = types.getType(item.m_build_info[0]);
CVType file_cvt = types.getType(item.m_build_info[2]);
llvm::cantFail(
TypeDeserializer::deserializeAs<StringIdRecord>(dir_cvt, working_dir));
llvm::cantFail(
TypeDeserializer::deserializeAs<StringIdRecord>(file_cvt, file_name));
llvm::sys::path::Style style = working_dir.String.startswith("/")
? llvm::sys::path::Style::posix
: llvm::sys::path::Style::windows;
if (llvm::sys::path::is_absolute(file_name.String, style))
return file_name.String;
llvm::SmallString<64> absolute_path = working_dir.String;
llvm::sys::path::append(absolute_path, file_name.String);
return absolute_path;
}
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