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/* Enumerate the PC ranges covered by a DIE.
Copyright (C) 2005 Red Hat, Inc.
This program is Open Source software; you can redistribute it and/or
modify it under the terms of the Open Software License version 1.0 as
published by the Open Source Initiative.
You should have received a copy of the Open Software License along
with this program; if not, you may obtain a copy of the Open Software
License version 1.0 from http://www.opensource.org/licenses/osl.php or
by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
3001 King Ranch Road, Ukiah, CA 95482. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libdwP.h"
#include <dwarf.h>
#include <assert.h>
ptrdiff_t
dwarf_ranges (Dwarf_Die *die, ptrdiff_t offset, Dwarf_Addr *basep,
Dwarf_Addr *startp, Dwarf_Addr *endp)
{
if (die == NULL)
return -1;
if (offset == 0
/* Usually there is a single contiguous range. */
&& INTUSE(dwarf_highpc) (die, endp) == 0
&& INTUSE(dwarf_lowpc) (die, startp) == 0)
/* A offset into .debug_ranges will never be 1, it must be at least a
multiple of 4. So we can return 1 as a special case value to mark
there are no ranges to look for on the next call. */
return 1;
if (offset == 1)
return 0;
/* We have to look for a noncontiguous range. */
const Elf_Data *d = die->cu->dbg->sectiondata[IDX_debug_ranges];
if (d == NULL)
{
__libdw_seterrno (DWARF_E_NO_DEBUG_RANGES);
return -1;
}
if (offset == 0)
{
Dwarf_Attribute attr_mem;
Dwarf_Attribute *attr = INTUSE(dwarf_attr) (die, DW_AT_ranges,
&attr_mem);
if (attr == NULL)
return -1;
/* Must have the form data4 or data8 which act as an offset. */
Dwarf_Word start_offset;
if (INTUSE(dwarf_formudata) (attr, &start_offset) != 0)
return -1;
offset = start_offset;
assert ((Dwarf_Word) offset == start_offset);
/* Fetch the CU's base address. */
Dwarf_Die cudie = CUDIE (attr->cu);
/* Find the base address of the compilation unit. It will
normally be specified by DW_AT_low_pc. In DWARF-3 draft 4,
the base address could be overridden by DW_AT_entry_pc. It's
been removed, but GCC emits DW_AT_entry_pc and not DW_AT_lowpc
for compilation units with discontinuous ranges. */
if (unlikely (INTUSE(dwarf_lowpc) (&cudie, basep) != 0)
&& INTUSE(dwarf_formaddr) (INTUSE(dwarf_attr) (&cudie,
DW_AT_entry_pc,
&attr_mem),
basep) != 0)
{
if (INTUSE(dwarf_errno) () == 0)
{
invalid:
__libdw_seterrno (DWARF_E_INVALID_DWARF);
}
return -1;
}
}
else if (offset < 0 || (size_t) offset >= d->d_size)
{
__libdw_seterrno (DWARF_E_INVALID_OFFSET);
return -1l;
}
unsigned char *readp = d->d_buf + offset;
next:
if ((unsigned char *) d->d_buf + d->d_size - readp
< die->cu->address_size * 2)
goto invalid;
Dwarf_Addr begin;
Dwarf_Addr end;
if (die->cu->address_size == 8)
{
begin = read_8ubyte_unaligned_inc (die->cu->dbg, readp);
end = read_8ubyte_unaligned_inc (die->cu->dbg, readp);
}
else
{
begin = (Dwarf_Sword) read_4sbyte_unaligned_inc (die->cu->dbg,
readp);
end = read_4ubyte_unaligned_inc (die->cu->dbg, readp);
}
if (begin == (Dwarf_Addr) -1l) /* Base address entry. */
{
*basep = end;
goto next;
}
if (begin == 0 && end == 0) /* End of list entry. */
return 0;
/* We have an address range entry. */
*startp = *basep + begin;
*endp = *basep + end;
return readp - (unsigned char *) d->d_buf;
}
INTDEF (dwarf_ranges)
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