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| //===---------------------ProcessStructReader.h ------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_TARGET_PROCESSSTRUCTREADER_H
#define LLDB_TARGET_PROCESSSTRUCTREADER_H
#include "lldb/lldb-defines.h"
#include "lldb/lldb-types.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Target/Process.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Status.h"
#include <initializer_list>
#include <map>
#include <string>
namespace lldb_private {
class ProcessStructReader {
protected:
struct FieldImpl {
CompilerType type;
size_t offset;
size_t size;
};
std::map<ConstString, FieldImpl> m_fields;
DataExtractor m_data;
lldb::ByteOrder m_byte_order;
size_t m_addr_byte_size;
public:
ProcessStructReader(Process *process, lldb::addr_t base_addr,
CompilerType struct_type) {
if (!process)
return;
if (base_addr == 0 || base_addr == LLDB_INVALID_ADDRESS)
return;
m_byte_order = process->GetByteOrder();
m_addr_byte_size = process->GetAddressByteSize();
for (size_t idx = 0; idx < struct_type.GetNumFields(); idx++) {
std::string name;
uint64_t bit_offset;
uint32_t bitfield_bit_size;
bool is_bitfield;
CompilerType field_type = struct_type.GetFieldAtIndex(
idx, name, &bit_offset, &bitfield_bit_size, &is_bitfield);
// no support for bitfields in here (yet)
if (is_bitfield)
return;
auto size = field_type.GetByteSize(nullptr);
// no support for things larger than a uint64_t (yet)
if (!size || *size > 8)
return;
ConstString const_name = ConstString(name.c_str());
size_t byte_index = static_cast<size_t>(bit_offset / 8);
m_fields[const_name] =
FieldImpl{field_type, byte_index, static_cast<size_t>(*size)};
}
auto total_size = struct_type.GetByteSize(nullptr);
if (!total_size)
return;
lldb::DataBufferSP buffer_sp(new DataBufferHeap(*total_size, 0));
Status error;
process->ReadMemoryFromInferior(base_addr, buffer_sp->GetBytes(),
*total_size, error);
if (error.Fail())
return;
m_data = DataExtractor(buffer_sp, m_byte_order, m_addr_byte_size);
}
template <typename RetType>
RetType GetField(ConstString name, RetType fail_value = RetType()) {
auto iter = m_fields.find(name), end = m_fields.end();
if (iter == end)
return fail_value;
auto size = iter->second.size;
if (sizeof(RetType) < size)
return fail_value;
lldb::offset_t offset = iter->second.offset;
if (offset + size > m_data.GetByteSize())
return fail_value;
return (RetType)(m_data.GetMaxU64(&offset, size));
}
size_t GetOffsetOf(ConstString name, size_t fail_value = SIZE_MAX) {
auto iter = m_fields.find(name), end = m_fields.end();
if (iter == end)
return fail_value;
return iter->second.offset;
}
};
}
#endif // utility_ProcessStructReader_h_
|