bool
CompilerType::ReadFromMemory (lldb_private::ExecutionContext *exe_ctx,
lldb::addr_t addr,
AddressType address_type,
lldb_private::DataExtractor &data)
{
if (!IsValid())
return false;
// Can't convert a file address to anything valid without more
// context (which Module it came from)
if (address_type == eAddressTypeFile)
return false;
if (!GetCompleteType())
return false;
const uint64_t byte_size = GetByteSize(exe_ctx ? exe_ctx->GetBestExecutionContextScope() : NULL);
if (data.GetByteSize() < byte_size)
{
lldb::DataBufferSP data_sp(new DataBufferHeap (byte_size, '\0'));
data.SetData(data_sp);
}
uint8_t* dst = const_cast<uint8_t*>(data.PeekData(0, byte_size));
if (dst != nullptr)
{
if (address_type == eAddressTypeHost)
{
if (addr == 0)
return false;
// The address is an address in this process, so just copy it
memcpy (dst, (uint8_t*)nullptr + addr, byte_size);
return true;
}
else
{
Process *process = nullptr;
if (exe_ctx)
process = exe_ctx->GetProcessPtr();
if (process)
{
Error error;
return process->ReadMemory(addr, dst, byte_size, error) == byte_size;
}
}
}
return false;
}
size_t
ObjectFileJIT::ReadSectionData (const lldb_private::Section *section,
lldb_private::DataExtractor& section_data) const
{
if (section->GetFileSize())
{
const void *src = (void *)(uintptr_t)section->GetFileOffset();
DataBufferSP data_sp (new lldb_private::DataBufferHeap(src, section->GetFileSize()));
if (data_sp)
{
section_data.SetData (data_sp, 0, data_sp->GetByteSize());
section_data.SetByteOrder (GetByteOrder());
section_data.SetAddressByteSize (GetAddressByteSize());
return section_data.GetByteSize();
}
}
section_data.Clear();
return 0;
}
virtual size_t
Decode (const lldb_private::Disassembler &disassembler,
const lldb_private::DataExtractor &data,
uint32_t data_offset)
{
// All we have to do is read the opcode which can be easy for some
// architetures
bool got_op = false;
const ArchSpec &arch = m_disasm.GetArchitecture();
const uint32_t min_op_byte_size = arch.GetMinimumOpcodeByteSize();
const uint32_t max_op_byte_size = arch.GetMaximumOpcodeByteSize();
if (min_op_byte_size == max_op_byte_size)
{
// Fixed size instructions, just read that amount of data.
if (!data.ValidOffsetForDataOfSize(data_offset, min_op_byte_size))
return false;
switch (min_op_byte_size)
{
case 1:
m_opcode.SetOpcode8 (data.GetU8 (&data_offset));
got_op = true;
break;
case 2:
m_opcode.SetOpcode16 (data.GetU16 (&data_offset));
got_op = true;
break;
case 4:
m_opcode.SetOpcode32 (data.GetU32 (&data_offset));
got_op = true;
break;
case 8:
m_opcode.SetOpcode64 (data.GetU64 (&data_offset));
got_op = true;
break;
default:
m_opcode.SetOpcodeBytes(data.PeekData(data_offset, min_op_byte_size), min_op_byte_size);
got_op = true;
break;
}
}
if (!got_op)
{
::LLVMDisasmContextRef disasm_context = m_disasm.m_disasm_context;
bool is_altnernate_isa = false;
if (m_disasm.m_alternate_disasm_context)
{
const AddressClass address_class = GetAddressClass ();
if (address_class == eAddressClassCodeAlternateISA)
{
disasm_context = m_disasm.m_alternate_disasm_context;
is_altnernate_isa = true;
}
}
const llvm::Triple::ArchType machine = arch.GetMachine();
if (machine == llvm::Triple::arm || machine == llvm::Triple::thumb)
{
if (machine == llvm::Triple::thumb || is_altnernate_isa)
{
uint32_t thumb_opcode = data.GetU16(&data_offset);
if ((thumb_opcode & 0xe000) != 0xe000 || ((thumb_opcode & 0x1800u) == 0))
{
m_opcode.SetOpcode16 (thumb_opcode);
}
else
{
thumb_opcode <<= 16;
thumb_opcode |= data.GetU16(&data_offset);
m_opcode.SetOpcode32 (thumb_opcode);
m_is_valid = true;
}
}
else
{
m_opcode.SetOpcode32 (data.GetU32(&data_offset));
}
}
else
{
// The opcode isn't evenly sized, so we need to actually use the llvm
// disassembler to parse it and get the size.
char out_string[512];
m_disasm.Lock(this, NULL);
uint8_t *opcode_data = const_cast<uint8_t *>(data.PeekData (data_offset, 1));
const size_t opcode_data_len = data.GetByteSize() - data_offset;
const addr_t pc = m_address.GetFileAddress();
const size_t inst_size = ::LLVMDisasmInstruction (disasm_context,
opcode_data,
opcode_data_len,
pc, // PC value
out_string,
sizeof(out_string));
// The address lookup function could have caused us to fill in our comment
m_comment.clear();
m_disasm.Unlock();
if (inst_size == 0)
m_opcode.Clear();
else
{
m_opcode.SetOpcodeBytes(opcode_data, inst_size);
m_is_valid = true;
}
}
}
return m_opcode.GetByteSize();
}