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//===-- ObjectFileJSON.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 "Plugins/ObjectFile/JSON/ObjectFileJSON.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "llvm/ADT/DenseSet.h"
#include <optional>
using namespace llvm;
using namespace lldb;
using namespace lldb_private;
LLDB_PLUGIN_DEFINE(ObjectFileJSON)
char ObjectFileJSON::ID;
void ObjectFileJSON::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance,
CreateMemoryInstance, GetModuleSpecifications);
}
void ObjectFileJSON::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
ObjectFile *
ObjectFileJSON::CreateInstance(const ModuleSP &module_sp, DataBufferSP data_sp,
offset_t data_offset, const FileSpec *file,
offset_t file_offset, offset_t length) {
if (!data_sp) {
data_sp = MapFileData(*file, length, file_offset);
if (!data_sp)
return nullptr;
data_offset = 0;
}
if (!MagicBytesMatch(data_sp, 0, data_sp->GetByteSize()))
return nullptr;
// Update the data to contain the entire file if it doesn't already.
if (data_sp->GetByteSize() < length) {
data_sp = MapFileData(*file, length, file_offset);
if (!data_sp)
return nullptr;
data_offset = 0;
}
Log *log = GetLog(LLDBLog::Symbols);
auto text =
llvm::StringRef(reinterpret_cast<const char *>(data_sp->GetBytes()));
Expected<json::Value> json = json::parse(text);
if (!json) {
LLDB_LOG_ERROR(log, json.takeError(),
"failed to parse JSON object file: {0}");
return nullptr;
}
json::Path::Root root;
Header header;
if (!fromJSON(*json, header, root)) {
LLDB_LOG_ERROR(log, root.getError(),
"failed to parse JSON object file header: {0}");
return nullptr;
}
ArchSpec arch(header.triple);
UUID uuid;
uuid.SetFromStringRef(header.uuid);
Type type = header.type.value_or(eTypeDebugInfo);
Body body;
if (!fromJSON(*json, body, root)) {
LLDB_LOG_ERROR(log, root.getError(),
"failed to parse JSON object file body: {0}");
return nullptr;
}
return new ObjectFileJSON(module_sp, data_sp, data_offset, file, file_offset,
length, std::move(arch), std::move(uuid), type,
std::move(body.symbols), std::move(body.sections));
}
ObjectFile *ObjectFileJSON::CreateMemoryInstance(const ModuleSP &module_sp,
WritableDataBufferSP data_sp,
const ProcessSP &process_sp,
addr_t header_addr) {
return nullptr;
}
size_t ObjectFileJSON::GetModuleSpecifications(
const FileSpec &file, DataBufferSP &data_sp, offset_t data_offset,
offset_t file_offset, offset_t length, ModuleSpecList &specs) {
if (!MagicBytesMatch(data_sp, data_offset, data_sp->GetByteSize()))
return 0;
// Update the data to contain the entire file if it doesn't already.
if (data_sp->GetByteSize() < length) {
data_sp = MapFileData(file, length, file_offset);
if (!data_sp)
return 0;
data_offset = 0;
}
Log *log = GetLog(LLDBLog::Symbols);
auto text =
llvm::StringRef(reinterpret_cast<const char *>(data_sp->GetBytes()));
Expected<json::Value> json = json::parse(text);
if (!json) {
LLDB_LOG_ERROR(log, json.takeError(),
"failed to parse JSON object file: {0}");
return 0;
}
json::Path::Root root;
Header header;
if (!fromJSON(*json, header, root)) {
LLDB_LOG_ERROR(log, root.getError(),
"failed to parse JSON object file header: {0}");
return 0;
}
ArchSpec arch(header.triple);
UUID uuid;
uuid.SetFromStringRef(header.uuid);
ModuleSpec spec(file, std::move(arch));
spec.GetUUID() = std::move(uuid);
specs.Append(spec);
return 1;
}
ObjectFileJSON::ObjectFileJSON(const ModuleSP &module_sp, DataBufferSP &data_sp,
offset_t data_offset, const FileSpec *file,
offset_t offset, offset_t length, ArchSpec arch,
UUID uuid, Type type,
std::vector<JSONSymbol> symbols,
std::vector<JSONSection> sections)
: ObjectFile(module_sp, file, offset, length, data_sp, data_offset),
m_arch(std::move(arch)), m_uuid(std::move(uuid)), m_type(type),
m_symbols(std::move(symbols)), m_sections(std::move(sections)) {}
bool ObjectFileJSON::ParseHeader() {
// We already parsed the header during initialization.
return true;
}
void ObjectFileJSON::ParseSymtab(Symtab &symtab) {
Log *log = GetLog(LLDBLog::Symbols);
SectionList *section_list = GetModule()->GetSectionList();
for (JSONSymbol json_symbol : m_symbols) {
llvm::Expected<Symbol> symbol = Symbol::FromJSON(json_symbol, section_list);
if (!symbol) {
LLDB_LOG_ERROR(log, symbol.takeError(), "invalid symbol: {0}");
continue;
}
symtab.AddSymbol(*symbol);
}
symtab.Finalize();
}
void ObjectFileJSON::CreateSections(SectionList &unified_section_list) {
if (m_sections_up)
return;
m_sections_up = std::make_unique<SectionList>();
lldb::user_id_t id = 1;
for (const auto §ion : m_sections) {
auto section_sp = std::make_shared<Section>(
GetModule(), this, id++, ConstString(section.name),
section.type.value_or(eSectionTypeCode), 0, section.size.value_or(0), 0,
section.size.value_or(0), /*log2align*/ 0, /*flags*/ 0);
m_sections_up->AddSection(section_sp);
unified_section_list.AddSection(section_sp);
}
}
bool ObjectFileJSON::MagicBytesMatch(DataBufferSP data_sp,
lldb::addr_t data_offset,
lldb::addr_t data_length) {
DataExtractor data;
data.SetData(data_sp, data_offset, data_length);
lldb::offset_t offset = 0;
uint32_t magic = data.GetU8(&offset);
return magic == '{';
}
namespace lldb_private {
bool fromJSON(const json::Value &value, ObjectFileJSON::Header &header,
json::Path path) {
json::ObjectMapper o(value, path);
return o && o.map("triple", header.triple) && o.map("uuid", header.uuid) &&
o.map("type", header.type);
}
bool fromJSON(const json::Value &value, ObjectFileJSON::Body &body,
json::Path path) {
json::ObjectMapper o(value, path);
return o && o.mapOptional("symbols", body.symbols) &&
o.mapOptional("sections", body.sections);
}
} // namespace lldb_private
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