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/* Determine whether a DIE covers a PC address.
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>
int
dwarf_haspc (Dwarf_Die *die, Dwarf_Addr pc)
{
if (die == NULL)
return -1;
/* Usually there is a single contiguous range. */
Dwarf_Addr lowpc, highpc;
if (INTUSE(dwarf_highpc) (die, &highpc) == 0
&& INTUSE(dwarf_lowpc) (die, &lowpc) == 0)
return pc >= lowpc && pc < highpc;
/* We have to look for a noncontiguous range. */
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 offset;
if (INTUSE(dwarf_formudata) (attr, &offset) != 0)
return -1;
const Elf_Data *d = attr->cu->dbg->sectiondata[IDX_debug_ranges];
if (d == NULL)
{
__libdw_seterrno (DWARF_E_NO_DEBUG_RANGES);
return -1;
}
/* Fetch the CU's base address. */
Dwarf_Addr base;
Dwarf_Die cudie =
{
.cu = attr->cu,
.addr = ((char *) attr->cu->dbg->sectiondata[IDX_debug_info]->d_buf
+ attr->cu->start + 3 * attr->cu->offset_size - 4 + 3),
};
if (INTUSE(dwarf_lowpc) (&cudie, &base) != 0)
return -1;
unsigned char *readp = d->d_buf + offset;
Dwarf_Addr begin;
Dwarf_Addr end;
do
{
next:
if ((unsigned char *) d->d_buf + d->d_size - readp
< attr->cu->address_size * 2)
{
__libdw_seterrno (DWARF_E_INVALID_DWARF);
return -1;
}
if (attr->cu->address_size == 8)
{
begin = read_8ubyte_unaligned_inc (attr->cu->dbg, readp);
end = read_8ubyte_unaligned_inc (attr->cu->dbg, readp);
}
else
{
begin = (Dwarf_Sword) read_4sbyte_unaligned_inc (attr->cu->dbg,
readp);
end = read_4ubyte_unaligned_inc (attr->cu->dbg, readp);
}
if (begin == (Dwarf_Addr) -1l) /* Base address entry. */
{
base = end;
goto next;
}
if (begin == 0 && end == 0) /* End of list entry. */
/* This is not the droid you are looking for. */
return 0;
/* We have an address range entry. */
}
while (pc < base + begin || pc >= base + end);
/* This one matches the address. */
return 1;
}
INTDEF (dwarf_haspc)
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