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//===-- ObjectFileBreakpad.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/Breakpad/ObjectFileBreakpad.h"
#include "Plugins/ObjectFile/Breakpad/BreakpadRecords.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::breakpad;
LLDB_PLUGIN_DEFINE(ObjectFileBreakpad)
namespace {
struct Header {
ArchSpec arch;
UUID uuid;
static std::optional<Header> parse(llvm::StringRef text);
};
} // namespace
std::optional<Header> Header::parse(llvm::StringRef text) {
llvm::StringRef line;
std::tie(line, text) = text.split('\n');
auto Module = ModuleRecord::parse(line);
if (!Module)
return std::nullopt;
llvm::Triple triple;
triple.setArch(Module->Arch);
triple.setOS(Module->OS);
std::tie(line, text) = text.split('\n');
auto Info = InfoRecord::parse(line);
UUID uuid = Info && Info->ID ? Info->ID : Module->ID;
return Header{ArchSpec(triple), std::move(uuid)};
}
char ObjectFileBreakpad::ID;
void ObjectFileBreakpad::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance,
CreateMemoryInstance, GetModuleSpecifications);
}
void ObjectFileBreakpad::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
ObjectFile *ObjectFileBreakpad::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;
}
auto text = toStringRef(data_sp->GetData());
std::optional<Header> header = Header::parse(text);
if (!header)
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;
}
return new ObjectFileBreakpad(module_sp, data_sp, data_offset, file,
file_offset, length, std::move(header->arch),
std::move(header->uuid));
}
ObjectFile *ObjectFileBreakpad::CreateMemoryInstance(
const ModuleSP &module_sp, WritableDataBufferSP data_sp,
const ProcessSP &process_sp, addr_t header_addr) {
return nullptr;
}
size_t ObjectFileBreakpad::GetModuleSpecifications(
const FileSpec &file, DataBufferSP &data_sp, offset_t data_offset,
offset_t file_offset, offset_t length, ModuleSpecList &specs) {
auto text = toStringRef(data_sp->GetData());
std::optional<Header> header = Header::parse(text);
if (!header)
return 0;
ModuleSpec spec(file, std::move(header->arch));
spec.GetUUID() = std::move(header->uuid);
specs.Append(spec);
return 1;
}
ObjectFileBreakpad::ObjectFileBreakpad(const ModuleSP &module_sp,
DataBufferSP &data_sp,
offset_t data_offset,
const FileSpec *file, offset_t offset,
offset_t length, ArchSpec arch,
UUID uuid)
: ObjectFile(module_sp, file, offset, length, data_sp, data_offset),
m_arch(std::move(arch)), m_uuid(std::move(uuid)) {}
bool ObjectFileBreakpad::ParseHeader() {
// We already parsed the header during initialization.
return true;
}
void ObjectFileBreakpad::ParseSymtab(Symtab &symtab) {
// Nothing to do for breakpad files, all information is parsed as debug info
// which means "lldb_private::Function" objects are used, or symbols are added
// by the SymbolFileBreakpad::AddSymbols(...) function in the symbol file.
}
void ObjectFileBreakpad::CreateSections(SectionList &unified_section_list) {
if (m_sections_up)
return;
m_sections_up = std::make_unique<SectionList>();
std::optional<Record::Kind> current_section;
offset_t section_start;
llvm::StringRef text = toStringRef(m_data.GetData());
uint32_t next_section_id = 1;
auto maybe_add_section = [&](const uint8_t *end_ptr) {
if (!current_section)
return; // We have been called before parsing the first line.
offset_t end_offset = end_ptr - m_data.GetDataStart();
auto section_sp = std::make_shared<Section>(
GetModule(), this, next_section_id++,
ConstString(toString(*current_section)), eSectionTypeOther,
/*file_vm_addr*/ 0, /*vm_size*/ 0, section_start,
end_offset - section_start, /*log2align*/ 0, /*flags*/ 0);
m_sections_up->AddSection(section_sp);
unified_section_list.AddSection(section_sp);
};
while (!text.empty()) {
llvm::StringRef line;
std::tie(line, text) = text.split('\n');
std::optional<Record::Kind> next_section = Record::classify(line);
if (next_section == Record::Line || next_section == Record::Inline) {
// Line/Inline records logically belong to the preceding Func record, so
// we put them in the same section.
next_section = Record::Func;
}
if (next_section == current_section)
continue;
// Changing sections, finish off the previous one, if there was any.
maybe_add_section(line.bytes_begin());
// And start a new one.
current_section = next_section;
section_start = line.bytes_begin() - m_data.GetDataStart();
}
// Finally, add the last section.
maybe_add_section(m_data.GetDataEnd());
}
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