C++ DataExtractor::GetLongDouble方法代码示例

//.........这里部分代码省略.........
                    success = true;
                    break;
             }

             if (success)
                 return_valobj_sp = ValueObjectConstResult::Create (thread.GetStackFrameAtIndex(0).get(),
                                                                    value,
                                                                    ConstString(""));
        }

        else if (type_flags & eTypeIsEnumeration)     // handles enum
        {
            uint32_t enm = thread.GetRegisterContext()->ReadRegisterAsUnsigned(eax_id, 0) & 0xffffffff ;
            value.SetValueType(Value::eValueTypeScalar);
            value.GetScalar() = enm;
            return_valobj_sp = ValueObjectConstResult::Create (thread.GetStackFrameAtIndex(0).get(),
                                                               value,
                                                               ConstString(""));
        }

        else if (type_flags & eTypeIsFloat)  // 'Floating Point'
        {
            if (byte_size <= 12)      // handles float, double, long double, __float80
            {
                const RegisterInfo *st0_info = reg_ctx->GetRegisterInfoByName("st0", 0);
                RegisterValue st0_value;

                if (reg_ctx->ReadRegister (st0_info, st0_value))
                {
                    DataExtractor data;
                    if (st0_value.GetData(data))
                    {
                        lldb::offset_t offset = 0;
                        long double value_long_double = data.GetLongDouble(&offset);

                        if (byte_size == 4)    // float is 4 bytes
                        {
                            float value_float = (float)value_long_double;
                            value.GetScalar() = value_float;
                            success = true;
                        }
                        else if (byte_size == 8)   // double is 8 bytes
                        {
                            // On Android Platform: long double is also 8 bytes
                            // It will be handled here only.
                            double value_double = (double)value_long_double;
                            value.GetScalar() =  value_double;
                            success = true;
                        }
                        else if (byte_size == 12) // long double and __float80 are 12 bytes on i386
                        {
                            value.GetScalar() = value_long_double;
                            success = true;
                        }
                    }
                }

                if (success)
                    return_valobj_sp = ValueObjectConstResult::Create (thread.GetStackFrameAtIndex(0).get(),
                                                                       value,
                                                                       ConstString(""));
            }
            else if(byte_size == 16)   // handles __float128
            {
                lldb::addr_t storage_addr = (uint32_t)(thread.GetRegisterContext()->ReadRegisterAsUnsigned(eax_id, 0) & 0xffffffff);
                return_valobj_sp = ValueObjectMemory::Create (&thread,

//.........这里部分代码省略.........
                 sizeof(addr_t));
      break;

    case eFormatComplexInteger: {
      size_t complex_int_byte_size = item_byte_size / 2;

      if (complex_int_byte_size > 0 && complex_int_byte_size <= 8) {
        s->Printf("%" PRIu64,
                  DE.GetMaxU64Bitfield(&offset, complex_int_byte_size, 0, 0));
        s->Printf(" + %" PRIu64 "i",
                  DE.GetMaxU64Bitfield(&offset, complex_int_byte_size, 0, 0));
      } else {
        s->Printf("error: unsupported byte size (%" PRIu64
                  ") for complex integer format",
                  (uint64_t)item_byte_size);
        return offset;
      }
    } break;

    case eFormatComplex:
      if (sizeof(float) * 2 == item_byte_size) {
        float f32_1 = DE.GetFloat(&offset);
        float f32_2 = DE.GetFloat(&offset);

        s->Printf("%g + %gi", f32_1, f32_2);
        break;
      } else if (sizeof(double) * 2 == item_byte_size) {
        double d64_1 = DE.GetDouble(&offset);
        double d64_2 = DE.GetDouble(&offset);

        s->Printf("%lg + %lgi", d64_1, d64_2);
        break;
      } else if (sizeof(long double) * 2 == item_byte_size) {
        long double ld64_1 = DE.GetLongDouble(&offset);
        long double ld64_2 = DE.GetLongDouble(&offset);
        s->Printf("%Lg + %Lgi", ld64_1, ld64_2);
        break;
      } else {
        s->Printf("error: unsupported byte size (%" PRIu64
                  ") for complex float format",
                  (uint64_t)item_byte_size);
        return offset;
      }
      break;

    default:
    case eFormatDefault:
    case eFormatHex:
    case eFormatHexUppercase: {
      bool wantsuppercase = (item_format == eFormatHexUppercase);
      switch (item_byte_size) {
      case 1:
      case 2:
      case 4:
      case 8:
        s->Printf(wantsuppercase ? "0x%*.*" PRIX64 : "0x%*.*" PRIx64,
                  (int)(2 * item_byte_size), (int)(2 * item_byte_size),
                  DE.GetMaxU64Bitfield(&offset, item_byte_size, item_bit_size,
                                       item_bit_offset));
        break;
      default: {
        assert(item_bit_size == 0 && item_bit_offset == 0);
        const uint8_t *bytes =
            (const uint8_t *)DE.GetData(&offset, item_byte_size);
        if (bytes) {
          s->PutCString("0x");

Error
RegisterValue::SetValueFromData (const RegisterInfo *reg_info, DataExtractor &src, lldb::offset_t src_offset, bool partial_data_ok)
{
    Error error;
    
    if (src.GetByteSize() == 0)
    {
        error.SetErrorString ("empty data.");
        return error;
    }

    if (reg_info->byte_size == 0)
    {
        error.SetErrorString ("invalid register info.");
        return error;
    }

    uint32_t src_len = src.GetByteSize() - src_offset;
    
    if (!partial_data_ok && (src_len < reg_info->byte_size))
    {
        error.SetErrorString ("not enough data.");
        return error;
    }
        
    // Cap the data length if there is more than enough bytes for this register
    // value
    if (src_len > reg_info->byte_size)
        src_len = reg_info->byte_size;

    // Zero out the value in case we get partial data...
    memset (m_data.buffer.bytes, 0, sizeof (m_data.buffer.bytes));
    
    switch (SetType (reg_info))
    {
        case eTypeInvalid:
            error.SetErrorString("");
            break;
        case eTypeUInt8:    SetUInt8  (src.GetMaxU32 (&src_offset, src_len)); break;
        case eTypeUInt16:   SetUInt16 (src.GetMaxU32 (&src_offset, src_len)); break;
        case eTypeUInt32:   SetUInt32 (src.GetMaxU32 (&src_offset, src_len)); break;
        case eTypeUInt64:   SetUInt64 (src.GetMaxU64 (&src_offset, src_len)); break;
#if defined (ENABLE_128_BIT_SUPPORT)
        case eTypeUInt128:
            {
                __uint128_t data1 = src.GetU64 (&src_offset);
                __uint128_t data2 = src.GetU64 (&src_offset);
                if (src.GetByteSize() == eByteOrderBig)
                    SetUInt128 (data1 << 64 + data2);
                else
                    SetUInt128 (data2 << 64 + data1);
            }
            break;
#endif
        case eTypeFloat:        SetFloat (src.GetFloat (&src_offset));      break;
        case eTypeDouble:       SetDouble(src.GetDouble (&src_offset));     break;
        case eTypeLongDouble:   SetFloat (src.GetLongDouble (&src_offset)); break;
        case eTypeBytes:
        {
            m_data.buffer.length = reg_info->byte_size;
            m_data.buffer.byte_order = src.GetByteOrder();
            assert (m_data.buffer.length <= kMaxRegisterByteSize);
            if (m_data.buffer.length > kMaxRegisterByteSize)
                m_data.buffer.length = kMaxRegisterByteSize;
            if (src.CopyByteOrderedData (src_offset,                    // offset within "src" to start extracting data
                                         src_len,                       // src length
                                         m_data.buffer.bytes,           // dst buffer
                                         m_data.buffer.length,          // dst length
                                         m_data.buffer.byte_order) == 0)// dst byte order
            {
                error.SetErrorString ("data copy failed data.");
                return error;
            }
        }
    }
    
    return error;
}

Error RegisterValue::SetValueFromData(const RegisterInfo *reg_info,
                                      DataExtractor &src,
                                      lldb::offset_t src_offset,
                                      bool partial_data_ok) {
  Error error;

  if (src.GetByteSize() == 0) {
    error.SetErrorString("empty data.");
    return error;
  }

  if (reg_info->byte_size == 0) {
    error.SetErrorString("invalid register info.");
    return error;
  }

  uint32_t src_len = src.GetByteSize() - src_offset;

  if (!partial_data_ok && (src_len < reg_info->byte_size)) {
    error.SetErrorString("not enough data.");
    return error;
  }

  // Cap the data length if there is more than enough bytes for this register
  // value
  if (src_len > reg_info->byte_size)
    src_len = reg_info->byte_size;

  // Zero out the value in case we get partial data...
  memset(buffer.bytes, 0, sizeof(buffer.bytes));

  type128 int128;

  m_type = eTypeInvalid;
  switch (reg_info->encoding) {
  case eEncodingInvalid:
    break;
  case eEncodingUint:
  case eEncodingSint:
    if (reg_info->byte_size == 1)
      SetUInt8(src.GetMaxU32(&src_offset, src_len));
    else if (reg_info->byte_size <= 2)
      SetUInt16(src.GetMaxU32(&src_offset, src_len));
    else if (reg_info->byte_size <= 4)
      SetUInt32(src.GetMaxU32(&src_offset, src_len));
    else if (reg_info->byte_size <= 8)
      SetUInt64(src.GetMaxU64(&src_offset, src_len));
    else if (reg_info->byte_size <= 16) {
      uint64_t data1 = src.GetU64(&src_offset);
      uint64_t data2 = src.GetU64(&src_offset);
      if (src.GetByteSize() == eByteOrderBig) {
        int128.x[0] = data1;
        int128.x[1] = data2;
      } else {
        int128.x[0] = data2;
        int128.x[1] = data1;
      }
      SetUInt128(llvm::APInt(128, 2, int128.x));
    }
    break;
  case eEncodingIEEE754:
    if (reg_info->byte_size == sizeof(float))
      SetFloat(src.GetFloat(&src_offset));
    else if (reg_info->byte_size == sizeof(double))
      SetDouble(src.GetDouble(&src_offset));
    else if (reg_info->byte_size == sizeof(long double))
      SetLongDouble(src.GetLongDouble(&src_offset));
    break;
  case eEncodingVector: {
    m_type = eTypeBytes;
    buffer.length = reg_info->byte_size;
    buffer.byte_order = src.GetByteOrder();
    assert(buffer.length <= kMaxRegisterByteSize);
    if (buffer.length > kMaxRegisterByteSize)
      buffer.length = kMaxRegisterByteSize;
    if (src.CopyByteOrderedData(
            src_offset,    // offset within "src" to start extracting data
            src_len,       // src length
            buffer.bytes,  // dst buffer
            buffer.length, // dst length
            buffer.byte_order) == 0) // dst byte order
    {
      error.SetErrorStringWithFormat(
          "failed to copy data for register write of %s", reg_info->name);
      return error;
    }
  }
  }

  if (m_type == eTypeInvalid)
    error.SetErrorStringWithFormat(
        "invalid register value type for register %s", reg_info->name);
  return error;
}