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//===-- SymbolVendorWasm.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 "SymbolVendorWasm.h"
#include <cstring>
#include <optional>
#include "Plugins/ObjectFile/wasm/ObjectFileWasm.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::wasm;
LLDB_PLUGIN_DEFINE(SymbolVendorWasm)
// SymbolVendorWasm constructor
SymbolVendorWasm::SymbolVendorWasm(const lldb::ModuleSP &module_sp)
: SymbolVendor(module_sp) {}
void SymbolVendorWasm::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance);
}
void SymbolVendorWasm::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
llvm::StringRef SymbolVendorWasm::GetPluginDescriptionStatic() {
return "Symbol vendor for WASM that looks for dwo files that match "
"executables.";
}
// CreateInstance
//
// Platforms can register a callback to use when creating symbol vendors to
// allow for complex debug information file setups, and to also allow for
// finding separate debug information files.
SymbolVendor *
SymbolVendorWasm::CreateInstance(const lldb::ModuleSP &module_sp,
lldb_private::Stream *feedback_strm) {
if (!module_sp)
return nullptr;
ObjectFileWasm *obj_file =
llvm::dyn_cast_or_null<ObjectFileWasm>(module_sp->GetObjectFile());
if (!obj_file)
return nullptr;
// If the main object file already contains debug info, then we are done.
if (obj_file->GetSectionList()->FindSectionByType(
lldb::eSectionTypeDWARFDebugInfo, true))
return nullptr;
LLDB_SCOPED_TIMERF("SymbolVendorWasm::CreateInstance (module = %s)",
module_sp->GetFileSpec().GetPath().c_str());
ModuleSpec module_spec;
module_spec.GetFileSpec() = obj_file->GetFileSpec();
FileSystem::Instance().Resolve(module_spec.GetFileSpec());
module_spec.GetUUID() = obj_file->GetUUID();
// A Wasm module may have a custom section named "external_debug_info" whose
// content is the absolute or relative path of the Wasm module that contains
// debug symbols for this module.
std::optional<FileSpec> symbol_file_spec =
obj_file->GetExternalDebugInfoFileSpec();
if (!symbol_file_spec)
return nullptr;
module_spec.GetSymbolFileSpec() = *symbol_file_spec;
FileSpecList search_paths = Target::GetDefaultDebugFileSearchPaths();
FileSpec sym_fspec =
PluginManager::LocateExecutableSymbolFile(module_spec, search_paths);
if (!sym_fspec)
return nullptr;
DataBufferSP sym_file_data_sp;
lldb::offset_t sym_file_data_offset = 0;
ObjectFileSP sym_objfile_sp = ObjectFile::FindPlugin(
module_sp, &sym_fspec, 0, FileSystem::Instance().GetByteSize(sym_fspec),
sym_file_data_sp, sym_file_data_offset);
if (!sym_objfile_sp)
return nullptr;
// This objfile is for debugging purposes.
sym_objfile_sp->SetType(ObjectFile::eTypeDebugInfo);
SymbolVendorWasm *symbol_vendor = new SymbolVendorWasm(module_sp);
// Get the module unified section list and add our debug sections to
// that.
SectionList *module_section_list = module_sp->GetSectionList();
SectionList *objfile_section_list = sym_objfile_sp->GetSectionList();
if (!module_section_list || !objfile_section_list)
return nullptr;
static const SectionType g_sections[] = {
eSectionTypeDWARFDebugAbbrev, eSectionTypeDWARFDebugAddr,
eSectionTypeDWARFDebugAranges, eSectionTypeDWARFDebugCuIndex,
eSectionTypeDWARFDebugFrame, eSectionTypeDWARFDebugInfo,
eSectionTypeDWARFDebugLine, eSectionTypeDWARFDebugLineStr,
eSectionTypeDWARFDebugLoc, eSectionTypeDWARFDebugLocLists,
eSectionTypeDWARFDebugMacInfo, eSectionTypeDWARFDebugMacro,
eSectionTypeDWARFDebugPubNames, eSectionTypeDWARFDebugPubTypes,
eSectionTypeDWARFDebugRanges, eSectionTypeDWARFDebugRngLists,
eSectionTypeDWARFDebugStr, eSectionTypeDWARFDebugStrOffsets,
eSectionTypeDWARFDebugTypes};
for (SectionType section_type : g_sections) {
if (SectionSP section_sp =
objfile_section_list->FindSectionByType(section_type, true)) {
if (SectionSP module_section_sp =
module_section_list->FindSectionByType(section_type, true))
module_section_list->ReplaceSection(module_section_sp->GetID(),
section_sp);
else
module_section_list->AddSection(section_sp);
}
}
symbol_vendor->AddSymbolFileRepresentation(sym_objfile_sp);
return symbol_vendor;
}
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