lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugMacinfoEntry.cpp

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

#include "DWARFDebugMacinfoEntry.h"

#include "lldb/Core/Stream.h"

using namespace lldb_private;
using namespace std;

DWARFDebugMacinfoEntry::DWARFDebugMacinfoEntry() :
    m_type_code(0),
    m_line(0),
    m_op2()
{
    m_op2.cstr = NULL;
}

DWARFDebugMacinfoEntry::~DWARFDebugMacinfoEntry()
{
}

const char*
DWARFDebugMacinfoEntry::GetCString() const
{
    switch (m_type_code)
    {
    case 0:
    case DW_MACINFO_start_file:
    case DW_MACINFO_end_file:
        return NULL;
    default:
        break;
    }
    return m_op2.cstr;
}



void
DWARFDebugMacinfoEntry::Dump(Stream *s) const
{
    if (m_type_code)
    {
        s->PutCString(DW_MACINFO_value_to_name(m_type_code));

        switch (m_type_code)
        {
        case DW_MACINFO_define:
            s->Printf(" line:%u  #define %s\n", (uint32_t)m_line, m_op2.cstr);
            break;

        case DW_MACINFO_undef:
            s->Printf(" line:%u  #undef %s\n", (uint32_t)m_line, m_op2.cstr);
            break;

        default:
            s->Printf(" line:%u  str: '%s'\n", (uint32_t)m_line, m_op2.cstr);
            break;

        case DW_MACINFO_start_file:
            s->Printf(" line:%u  file index: '%u'\n", (uint32_t)m_line, (uint32_t)m_op2.file_idx);
            break;

        case DW_MACINFO_end_file:
            break;
        }
    }
    else
    {
        s->PutCString(" END\n");
    }
}


bool
DWARFDebugMacinfoEntry::Extract(const DataExtractor& mac_info_data, dw_offset_t* offset_ptr)
{
    if (mac_info_data.ValidOffset(*offset_ptr))
    {
        m_type_code = mac_info_data.GetU8(offset_ptr);

        switch (m_type_code)
        {

        case DW_MACINFO_define:
        case DW_MACINFO_undef:
            // 2 operands:
            // Arg 1: operand encodes the line number of the source line on which
            //      the relevant defining or undefining pre-processor directives
            //      appeared.
            m_line  = mac_info_data.GetULEB128(offset_ptr);
            // Arg 2: define string
            m_op2.cstr  = mac_info_data.GetCStr(offset_ptr);
            break;

        case DW_MACINFO_start_file:
            // 2 operands:
            // Op 1: line number of the source line on which the inclusion
            //      pre-processor directive occurred.
            m_line  = mac_info_data.GetULEB128(offset_ptr);
            // Op 2: a source file name index to a file number in the statement
            //      information table for the relevant compilation unit.
            m_op2.file_idx  = mac_info_data.GetULEB128(offset_ptr);
            break;

        case 0: // End of list
        case DW_MACINFO_end_file:
            // No operands
            m_line = DW_INVALID_OFFSET;
            m_op2.cstr = NULL;
            break;
        default:
            // Vendor specific entries always have a ULEB128 and a string
            m_line      = mac_info_data.GetULEB128(offset_ptr);
            m_op2.cstr  = mac_info_data.GetCStr(offset_ptr);
            break;
        }
        return true;
    }
    else
        m_type_code = 0;

    return false;
}