llvm-project/lldb/source/Core/Opcode.cpp

//===-- Opcode.cpp ----------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/Core/Opcode.h"

// C Includes
// C++ Includes
// Other libraries and framework includes
#include "llvm/ADT/Triple.h"

// Project includes
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Stream.h"
#include "lldb/Host/Endian.h"

using namespace lldb;
using namespace lldb_private;

int
Opcode::Dump (Stream *s, uint32_t min_byte_width)
{
    int bytes_written = 0;
    switch (m_type)
    {
    case Opcode::eTypeInvalid:
        bytes_written = s->PutCString ("<invalid>");
        break;
    case Opcode::eType8:
        bytes_written = s->Printf ("0x%2.2x", m_data.inst8);
        break;
    case Opcode::eType16:
        bytes_written = s->Printf ("0x%4.4x", m_data.inst16);
        break;
    case Opcode::eType16_2:
    case Opcode::eType32:
        bytes_written = s->Printf ("0x%8.8x", m_data.inst32);
        break;

    case Opcode::eType64:
        bytes_written = s->Printf ("0x%16.16" PRIx64, m_data.inst64);
        break;

    case Opcode::eTypeBytes:
        for (uint32_t i = 0; i < m_data.inst.length; ++i)
        {
            if (i > 0)
                bytes_written += s->PutChar (' ');
            bytes_written += s->Printf ("%2.2x", m_data.inst.bytes[i]);
        }
        break;
    }

    // Add spaces to make sure bytes dispay comes out even in case opcodes
    // aren't all the same size
    if (static_cast<uint32_t>(bytes_written) < min_byte_width)
        bytes_written = s->Printf ("%*s", min_byte_width - bytes_written, "");
    return bytes_written;
}

lldb::ByteOrder
Opcode::GetDataByteOrder () const
{
    if (m_byte_order != eByteOrderInvalid)
    {
        return m_byte_order;
    }
    switch (m_type)
    {
        case Opcode::eTypeInvalid: break;
        case Opcode::eType8:
        case Opcode::eType16:
        case Opcode::eType16_2:
        case Opcode::eType32:
        case Opcode::eType64:    return endian::InlHostByteOrder();
        case Opcode::eTypeBytes:
            break;
    }
    return eByteOrderInvalid;
}

uint32_t
Opcode::GetData (DataExtractor &data) const
{
    uint32_t byte_size = GetByteSize ();
    uint8_t swap_buf[8];
    const void *buf = nullptr;

    if (byte_size > 0)
    {
        if (!GetEndianSwap())
        {
            if (m_type == Opcode::eType16_2)
            {
                // 32 bit thumb instruction, we need to sizzle this a bit
                swap_buf[0] = m_data.inst.bytes[2];
                swap_buf[1] = m_data.inst.bytes[3];
                swap_buf[2] = m_data.inst.bytes[0];
                swap_buf[3] = m_data.inst.bytes[1];
                buf = swap_buf;
            }
            else
            {
                buf = GetOpcodeDataBytes();
            }
        }
        else
        {
            switch (m_type)
            {
                case Opcode::eTypeInvalid:
                    break;
                case Opcode::eType8:
                    buf = GetOpcodeDataBytes();
                    break;
                case Opcode::eType16:
                    *(uint16_t *)swap_buf = llvm::ByteSwap_16(m_data.inst16);
                    buf = swap_buf;
                    break;
                case Opcode::eType16_2:
                    swap_buf[0] = m_data.inst.bytes[1];
                    swap_buf[1] = m_data.inst.bytes[0];
                    swap_buf[2] = m_data.inst.bytes[3];
                    swap_buf[3] = m_data.inst.bytes[2];
                    buf = swap_buf;
                    break;
                case Opcode::eType32:
                    *(uint32_t *)swap_buf = llvm::ByteSwap_32(m_data.inst32);
                    buf = swap_buf;
                    break;
                case Opcode::eType64:
                    *(uint32_t *)swap_buf = llvm::ByteSwap_64(m_data.inst64);
                    buf = swap_buf;
                    break;
                case Opcode::eTypeBytes:
                    buf = GetOpcodeDataBytes();
                    break;
            }
        }
    }
    if (buf != nullptr)
    {
        DataBufferSP buffer_sp;

        buffer_sp.reset (new DataBufferHeap (buf, byte_size));
        data.SetByteOrder(GetDataByteOrder());
        data.SetData (buffer_sp);
        return byte_size;
    }
    data.Clear();
    return 0;
}