diff options
Diffstat (limited to 'lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp')
| -rw-r--r-- | lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp b/lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp new file mode 100644 index 000000000000..1c09dabc5622 --- /dev/null +++ b/lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp @@ -0,0 +1,147 @@ +//===-- 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 <string.h> + +#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/LocateSymbolFile.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); +} + +lldb_private::ConstString SymbolVendorWasm::GetPluginNameStatic() { + static ConstString g_name("WASM"); + return g_name; +} + +const char *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; + + static Timer::Category func_cat(LLVM_PRETTY_FUNCTION); + Timer scoped_timer(func_cat, "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. + llvm::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 = + Symbols::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(); + + 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; +} + +// PluginInterface protocol +ConstString SymbolVendorWasm::GetPluginName() { return GetPluginNameStatic(); } + +uint32_t SymbolVendorWasm::GetPluginVersion() { return 1; } |