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//===-- DWARFDebugRanges.cpp ------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DWARFDebugRanges.h"
#include "SymbolFileDWARF.h"
#include "lldb/Core/Stream.h"
#include <assert.h>
using namespace lldb_private;
using namespace std;
DWARFDebugRanges::DWARFDebugRanges() :
m_range_map()
{
}
DWARFDebugRanges::~DWARFDebugRanges()
{
}
void
DWARFDebugRanges::Extract(SymbolFileDWARF* dwarf2Data)
{
DWARFRangeList range_list;
lldb::offset_t offset = 0;
dw_offset_t debug_ranges_offset = offset;
while (Extract(dwarf2Data, &offset, range_list))
{
range_list.Sort();
m_range_map[debug_ranges_offset] = range_list;
debug_ranges_offset = offset;
}
}
bool
DWARFDebugRanges::Extract(SymbolFileDWARF* dwarf2Data, lldb::offset_t *offset_ptr, DWARFRangeList &range_list)
{
range_list.Clear();
lldb::offset_t range_offset = *offset_ptr;
const DWARFDataExtractor& debug_ranges_data = dwarf2Data->get_debug_ranges_data();
uint32_t addr_size = debug_ranges_data.GetAddressByteSize();
while (debug_ranges_data.ValidOffsetForDataOfSize(*offset_ptr, 2 * addr_size))
{
dw_addr_t begin = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
dw_addr_t end = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
if (!begin && !end)
{
// End of range list
break;
}
// Extend 4 byte addresses that consists of 32 bits of 1's to be 64 bits
// of ones
switch (addr_size)
{
case 2:
if (begin == 0xFFFFull)
begin = LLDB_INVALID_ADDRESS;
break;
case 4:
if (begin == 0xFFFFFFFFull)
begin = LLDB_INVALID_ADDRESS;
break;
case 8:
break;
default:
assert(!"DWARFRangeList::Extract() unsupported address size.");
break;
}
// Filter out empty ranges
if (begin < end)
range_list.Append(DWARFRangeList::Entry(begin, end - begin));
}
// Make sure we consumed at least something
return range_offset != *offset_ptr;
}
void
DWARFDebugRanges::Dump(Stream &s, const DWARFDataExtractor& debug_ranges_data, lldb::offset_t *offset_ptr, dw_addr_t cu_base_addr)
{
uint32_t addr_size = s.GetAddressByteSize();
bool verbose = s.GetVerbose();
dw_addr_t base_addr = cu_base_addr;
while (debug_ranges_data.ValidOffsetForDataOfSize(*offset_ptr, 2 * addr_size))
{
dw_addr_t begin = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
dw_addr_t end = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
// Extend 4 byte addresses that consists of 32 bits of 1's to be 64 bits
// of ones
if (begin == 0xFFFFFFFFull && addr_size == 4)
begin = LLDB_INVALID_ADDRESS;
s.Indent();
if (verbose)
{
s.AddressRange(begin, end, sizeof (dw_addr_t), " offsets = ");
}
if (begin == 0 && end == 0)
{
s.PutCString(" End");
break;
}
else if (begin == LLDB_INVALID_ADDRESS)
{
// A base address selection entry
base_addr = end;
s.Address(base_addr, sizeof (dw_addr_t), " Base address = ");
}
else
{
// Convert from offset to an address
dw_addr_t begin_addr = begin + base_addr;
dw_addr_t end_addr = end + base_addr;
s.AddressRange(begin_addr, end_addr, sizeof (dw_addr_t), verbose ? " ==> addrs = " : NULL);
}
}
}
bool
DWARFDebugRanges::FindRanges(dw_offset_t debug_ranges_offset, DWARFRangeList& range_list) const
{
range_map_const_iterator pos = m_range_map.find(debug_ranges_offset);
if (pos != m_range_map.end())
{
range_list = pos->second;
return true;
}
return false;
}
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