mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-21 01:12:32 +08:00
75ece951b5
Consider test.c, compiled with -g:
...
__complex__ float cf = 1 + 2i;
int main (void) { return 0; }
...
The values of cf and its components are:
...
$ gdb -q a.out
Reading symbols from a.out...
(gdb) p cf
$1 = 1 + 2i
(gdb) p $_creal(cf)
$2 = 1
(gdb) p $_cimag(cf)
$3 = 2
...
and their respective types are:
...
(gdb) ptype $1
type = complex float
(gdb) ptype $2
type = float
(gdb) ptype $3
type = float
...
Now let's try that again, using ptype directly:
...
(gdb) ptype cf
type = complex float
(gdb) ptype $_creal(cf)
type = int
(gdb) ptype $_cimag(cf)
type = int
...
The last two types should have been float, not int.
Fix this by extending the internal function handlers creal_internal_fn and
cimag_internal_fn with the noside parameter, such that we get instead:
...
(gdb) ptype $_creal(cf)
type = float
(gdb) ptype $_cimag(cf)
type = float
...
Tested on x86_64-linux.
Reviewed-By: Keith Seitz <keiths@redhat.com>
PR exp/31816
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31816
4583 lines
127 KiB
C
4583 lines
127 KiB
C
/* Low level packing and unpacking of values for GDB, the GNU Debugger.
|
||
|
||
Copyright (C) 1986-2024 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "arch-utils.h"
|
||
#include "extract-store-integer.h"
|
||
#include "symtab.h"
|
||
#include "gdbtypes.h"
|
||
#include "value.h"
|
||
#include "gdbcore.h"
|
||
#include "command.h"
|
||
#include "cli/cli-cmds.h"
|
||
#include "target.h"
|
||
#include "language.h"
|
||
#include "demangle.h"
|
||
#include "regcache.h"
|
||
#include "block.h"
|
||
#include "target-float.h"
|
||
#include "objfiles.h"
|
||
#include "valprint.h"
|
||
#include "cli/cli-decode.h"
|
||
#include "extension.h"
|
||
#include <ctype.h>
|
||
#include "tracepoint.h"
|
||
#include "cp-abi.h"
|
||
#include "user-regs.h"
|
||
#include <algorithm>
|
||
#include <iterator>
|
||
#include <map>
|
||
#include <utility>
|
||
#include <vector>
|
||
#include "completer.h"
|
||
#include "gdbsupport/selftest.h"
|
||
#include "gdbsupport/array-view.h"
|
||
#include "cli/cli-style.h"
|
||
#include "expop.h"
|
||
#include "inferior.h"
|
||
#include "varobj.h"
|
||
|
||
/* Definition of a user function. */
|
||
struct internal_function
|
||
{
|
||
/* The name of the function. It is a bit odd to have this in the
|
||
function itself -- the user might use a differently-named
|
||
convenience variable to hold the function. */
|
||
char *name;
|
||
|
||
/* The handler. */
|
||
internal_function_fn_noside handler;
|
||
|
||
/* User data for the handler. */
|
||
void *cookie;
|
||
};
|
||
|
||
/* Returns true if the ranges defined by [offset1, offset1+len1) and
|
||
[offset2, offset2+len2) overlap. */
|
||
|
||
static bool
|
||
ranges_overlap (LONGEST offset1, ULONGEST len1,
|
||
LONGEST offset2, ULONGEST len2)
|
||
{
|
||
LONGEST h, l;
|
||
|
||
l = std::max (offset1, offset2);
|
||
h = std::min (offset1 + len1, offset2 + len2);
|
||
return (l < h);
|
||
}
|
||
|
||
/* Returns true if RANGES contains any range that overlaps [OFFSET,
|
||
OFFSET+LENGTH). */
|
||
|
||
static bool
|
||
ranges_contain (const std::vector<range> &ranges, LONGEST offset,
|
||
ULONGEST length)
|
||
{
|
||
range what;
|
||
|
||
what.offset = offset;
|
||
what.length = length;
|
||
|
||
/* We keep ranges sorted by offset and coalesce overlapping and
|
||
contiguous ranges, so to check if a range list contains a given
|
||
range, we can do a binary search for the position the given range
|
||
would be inserted if we only considered the starting OFFSET of
|
||
ranges. We call that position I. Since we also have LENGTH to
|
||
care for (this is a range afterall), we need to check if the
|
||
_previous_ range overlaps the I range. E.g.,
|
||
|
||
R
|
||
|---|
|
||
|---| |---| |------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=1
|
||
|
||
In the case above, the binary search would return `I=1', meaning,
|
||
this OFFSET should be inserted at position 1, and the current
|
||
position 1 should be pushed further (and before 2). But, `0'
|
||
overlaps with R.
|
||
|
||
Then we need to check if the I range overlaps the I range itself.
|
||
E.g.,
|
||
|
||
R
|
||
|---|
|
||
|---| |---| |-------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=1
|
||
*/
|
||
|
||
|
||
auto i = std::lower_bound (ranges.begin (), ranges.end (), what);
|
||
|
||
if (i > ranges.begin ())
|
||
{
|
||
const struct range &bef = *(i - 1);
|
||
|
||
if (ranges_overlap (bef.offset, bef.length, offset, length))
|
||
return true;
|
||
}
|
||
|
||
if (i < ranges.end ())
|
||
{
|
||
const struct range &r = *i;
|
||
|
||
if (ranges_overlap (r.offset, r.length, offset, length))
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
static struct cmd_list_element *functionlist;
|
||
|
||
value::~value ()
|
||
{
|
||
if (this->lval () == lval_computed)
|
||
{
|
||
const struct lval_funcs *funcs = m_location.computed.funcs;
|
||
|
||
if (funcs->free_closure)
|
||
funcs->free_closure (this);
|
||
}
|
||
else if (this->lval () == lval_xcallable)
|
||
delete m_location.xm_worker;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct gdbarch *
|
||
value::arch () const
|
||
{
|
||
return type ()->arch ();
|
||
}
|
||
|
||
bool
|
||
value::bits_available (LONGEST offset, ULONGEST length) const
|
||
{
|
||
gdb_assert (!m_lazy);
|
||
|
||
/* Don't pretend we have anything available there in the history beyond
|
||
the boundaries of the value recorded. It's not like inferior memory
|
||
where there is actual stuff underneath. */
|
||
ULONGEST val_len = TARGET_CHAR_BIT * enclosing_type ()->length ();
|
||
return !((m_in_history
|
||
&& (offset < 0 || offset + length > val_len))
|
||
|| ranges_contain (m_unavailable, offset, length));
|
||
}
|
||
|
||
bool
|
||
value::bytes_available (LONGEST offset, ULONGEST length) const
|
||
{
|
||
ULONGEST sign = (1ULL << (sizeof (ULONGEST) * 8 - 1)) / TARGET_CHAR_BIT;
|
||
ULONGEST mask = (sign << 1) - 1;
|
||
|
||
if (offset != ((offset & mask) ^ sign) - sign
|
||
|| length != ((length & mask) ^ sign) - sign
|
||
|| (length > 0 && (~offset & (offset + length - 1) & sign) != 0))
|
||
error (_("Integer overflow in data location calculation"));
|
||
|
||
return bits_available (offset * TARGET_CHAR_BIT, length * TARGET_CHAR_BIT);
|
||
}
|
||
|
||
bool
|
||
value::bits_any_optimized_out (int bit_offset, int bit_length) const
|
||
{
|
||
gdb_assert (!m_lazy);
|
||
|
||
return ranges_contain (m_optimized_out, bit_offset, bit_length);
|
||
}
|
||
|
||
bool
|
||
value::entirely_available ()
|
||
{
|
||
/* We can only tell whether the whole value is available when we try
|
||
to read it. */
|
||
if (m_lazy)
|
||
fetch_lazy ();
|
||
|
||
if (m_unavailable.empty ())
|
||
return true;
|
||
return false;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
bool
|
||
value::entirely_covered_by_range_vector (const std::vector<range> &ranges)
|
||
{
|
||
/* We can only tell whether the whole value is optimized out /
|
||
unavailable when we try to read it. */
|
||
if (m_lazy)
|
||
fetch_lazy ();
|
||
|
||
if (ranges.size () == 1)
|
||
{
|
||
const struct range &t = ranges[0];
|
||
|
||
if (t.offset == 0
|
||
&& t.length == TARGET_CHAR_BIT * enclosing_type ()->length ())
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Insert into the vector pointed to by VECTORP the bit range starting of
|
||
OFFSET bits, and extending for the next LENGTH bits. */
|
||
|
||
static void
|
||
insert_into_bit_range_vector (std::vector<range> *vectorp,
|
||
LONGEST offset, ULONGEST length)
|
||
{
|
||
range newr;
|
||
|
||
/* Insert the range sorted. If there's overlap or the new range
|
||
would be contiguous with an existing range, merge. */
|
||
|
||
newr.offset = offset;
|
||
newr.length = length;
|
||
|
||
/* Do a binary search for the position the given range would be
|
||
inserted if we only considered the starting OFFSET of ranges.
|
||
Call that position I. Since we also have LENGTH to care for
|
||
(this is a range afterall), we need to check if the _previous_
|
||
range overlaps the I range. E.g., calling R the new range:
|
||
|
||
#1 - overlaps with previous
|
||
|
||
R
|
||
|-...-|
|
||
|---| |---| |------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=1
|
||
|
||
In the case #1 above, the binary search would return `I=1',
|
||
meaning, this OFFSET should be inserted at position 1, and the
|
||
current position 1 should be pushed further (and become 2). But,
|
||
note that `0' overlaps with R, so we want to merge them.
|
||
|
||
A similar consideration needs to be taken if the new range would
|
||
be contiguous with the previous range:
|
||
|
||
#2 - contiguous with previous
|
||
|
||
R
|
||
|-...-|
|
||
|--| |---| |------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=1
|
||
|
||
If there's no overlap with the previous range, as in:
|
||
|
||
#3 - not overlapping and not contiguous
|
||
|
||
R
|
||
|-...-|
|
||
|--| |---| |------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=1
|
||
|
||
or if I is 0:
|
||
|
||
#4 - R is the range with lowest offset
|
||
|
||
R
|
||
|-...-|
|
||
|--| |---| |------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=0
|
||
|
||
... we just push the new range to I.
|
||
|
||
All the 4 cases above need to consider that the new range may
|
||
also overlap several of the ranges that follow, or that R may be
|
||
contiguous with the following range, and merge. E.g.,
|
||
|
||
#5 - overlapping following ranges
|
||
|
||
R
|
||
|------------------------|
|
||
|--| |---| |------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=0
|
||
|
||
or:
|
||
|
||
R
|
||
|-------|
|
||
|--| |---| |------| ... |--|
|
||
0 1 2 N
|
||
|
||
I=1
|
||
|
||
*/
|
||
|
||
auto i = std::lower_bound (vectorp->begin (), vectorp->end (), newr);
|
||
if (i > vectorp->begin ())
|
||
{
|
||
struct range &bef = *(i - 1);
|
||
|
||
if (ranges_overlap (bef.offset, bef.length, offset, length))
|
||
{
|
||
/* #1 */
|
||
LONGEST l = std::min (bef.offset, offset);
|
||
LONGEST h = std::max (bef.offset + bef.length, offset + length);
|
||
|
||
bef.offset = l;
|
||
bef.length = h - l;
|
||
i--;
|
||
}
|
||
else if (offset == bef.offset + bef.length)
|
||
{
|
||
/* #2 */
|
||
bef.length += length;
|
||
i--;
|
||
}
|
||
else
|
||
{
|
||
/* #3 */
|
||
i = vectorp->insert (i, newr);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* #4 */
|
||
i = vectorp->insert (i, newr);
|
||
}
|
||
|
||
/* Check whether the ranges following the one we've just added or
|
||
touched can be folded in (#5 above). */
|
||
if (i != vectorp->end () && i + 1 < vectorp->end ())
|
||
{
|
||
int removed = 0;
|
||
auto next = i + 1;
|
||
|
||
/* Get the range we just touched. */
|
||
struct range &t = *i;
|
||
removed = 0;
|
||
|
||
i = next;
|
||
for (; i < vectorp->end (); i++)
|
||
{
|
||
struct range &r = *i;
|
||
if (r.offset <= t.offset + t.length)
|
||
{
|
||
LONGEST l, h;
|
||
|
||
l = std::min (t.offset, r.offset);
|
||
h = std::max (t.offset + t.length, r.offset + r.length);
|
||
|
||
t.offset = l;
|
||
t.length = h - l;
|
||
|
||
removed++;
|
||
}
|
||
else
|
||
{
|
||
/* If we couldn't merge this one, we won't be able to
|
||
merge following ones either, since the ranges are
|
||
always sorted by OFFSET. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (removed != 0)
|
||
vectorp->erase (next, next + removed);
|
||
}
|
||
}
|
||
|
||
void
|
||
value::mark_bits_unavailable (LONGEST offset, ULONGEST length)
|
||
{
|
||
insert_into_bit_range_vector (&m_unavailable, offset, length);
|
||
}
|
||
|
||
void
|
||
value::mark_bytes_unavailable (LONGEST offset, ULONGEST length)
|
||
{
|
||
mark_bits_unavailable (offset * TARGET_CHAR_BIT,
|
||
length * TARGET_CHAR_BIT);
|
||
}
|
||
|
||
/* Find the first range in RANGES that overlaps the range defined by
|
||
OFFSET and LENGTH, starting at element POS in the RANGES vector,
|
||
Returns the index into RANGES where such overlapping range was
|
||
found, or -1 if none was found. */
|
||
|
||
static int
|
||
find_first_range_overlap (const std::vector<range> *ranges, int pos,
|
||
LONGEST offset, LONGEST length)
|
||
{
|
||
int i;
|
||
|
||
for (i = pos; i < ranges->size (); i++)
|
||
{
|
||
const range &r = (*ranges)[i];
|
||
if (ranges_overlap (r.offset, r.length, offset, length))
|
||
return i;
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
/* Compare LENGTH_BITS of memory at PTR1 + OFFSET1_BITS with the memory at
|
||
PTR2 + OFFSET2_BITS. Return 0 if the memory is the same, otherwise
|
||
return non-zero.
|
||
|
||
It must always be the case that:
|
||
OFFSET1_BITS % TARGET_CHAR_BIT == OFFSET2_BITS % TARGET_CHAR_BIT
|
||
|
||
It is assumed that memory can be accessed from:
|
||
PTR + (OFFSET_BITS / TARGET_CHAR_BIT)
|
||
to:
|
||
PTR + ((OFFSET_BITS + LENGTH_BITS + TARGET_CHAR_BIT - 1)
|
||
/ TARGET_CHAR_BIT) */
|
||
static int
|
||
memcmp_with_bit_offsets (const gdb_byte *ptr1, size_t offset1_bits,
|
||
const gdb_byte *ptr2, size_t offset2_bits,
|
||
size_t length_bits)
|
||
{
|
||
gdb_assert (offset1_bits % TARGET_CHAR_BIT
|
||
== offset2_bits % TARGET_CHAR_BIT);
|
||
|
||
if (offset1_bits % TARGET_CHAR_BIT != 0)
|
||
{
|
||
size_t bits;
|
||
gdb_byte mask, b1, b2;
|
||
|
||
/* The offset from the base pointers PTR1 and PTR2 is not a complete
|
||
number of bytes. A number of bits up to either the next exact
|
||
byte boundary, or LENGTH_BITS (which ever is sooner) will be
|
||
compared. */
|
||
bits = TARGET_CHAR_BIT - offset1_bits % TARGET_CHAR_BIT;
|
||
gdb_assert (bits < sizeof (mask) * TARGET_CHAR_BIT);
|
||
mask = (1 << bits) - 1;
|
||
|
||
if (length_bits < bits)
|
||
{
|
||
mask &= ~(gdb_byte) ((1 << (bits - length_bits)) - 1);
|
||
bits = length_bits;
|
||
}
|
||
|
||
/* Now load the two bytes and mask off the bits we care about. */
|
||
b1 = *(ptr1 + offset1_bits / TARGET_CHAR_BIT) & mask;
|
||
b2 = *(ptr2 + offset2_bits / TARGET_CHAR_BIT) & mask;
|
||
|
||
if (b1 != b2)
|
||
return 1;
|
||
|
||
/* Now update the length and offsets to take account of the bits
|
||
we've just compared. */
|
||
length_bits -= bits;
|
||
offset1_bits += bits;
|
||
offset2_bits += bits;
|
||
}
|
||
|
||
if (length_bits % TARGET_CHAR_BIT != 0)
|
||
{
|
||
size_t bits;
|
||
size_t o1, o2;
|
||
gdb_byte mask, b1, b2;
|
||
|
||
/* The length is not an exact number of bytes. After the previous
|
||
IF.. block then the offsets are byte aligned, or the
|
||
length is zero (in which case this code is not reached). Compare
|
||
a number of bits at the end of the region, starting from an exact
|
||
byte boundary. */
|
||
bits = length_bits % TARGET_CHAR_BIT;
|
||
o1 = offset1_bits + length_bits - bits;
|
||
o2 = offset2_bits + length_bits - bits;
|
||
|
||
gdb_assert (bits < sizeof (mask) * TARGET_CHAR_BIT);
|
||
mask = ((1 << bits) - 1) << (TARGET_CHAR_BIT - bits);
|
||
|
||
gdb_assert (o1 % TARGET_CHAR_BIT == 0);
|
||
gdb_assert (o2 % TARGET_CHAR_BIT == 0);
|
||
|
||
b1 = *(ptr1 + o1 / TARGET_CHAR_BIT) & mask;
|
||
b2 = *(ptr2 + o2 / TARGET_CHAR_BIT) & mask;
|
||
|
||
if (b1 != b2)
|
||
return 1;
|
||
|
||
length_bits -= bits;
|
||
}
|
||
|
||
if (length_bits > 0)
|
||
{
|
||
/* We've now taken care of any stray "bits" at the start, or end of
|
||
the region to compare, the remainder can be covered with a simple
|
||
memcmp. */
|
||
gdb_assert (offset1_bits % TARGET_CHAR_BIT == 0);
|
||
gdb_assert (offset2_bits % TARGET_CHAR_BIT == 0);
|
||
gdb_assert (length_bits % TARGET_CHAR_BIT == 0);
|
||
|
||
return memcmp (ptr1 + offset1_bits / TARGET_CHAR_BIT,
|
||
ptr2 + offset2_bits / TARGET_CHAR_BIT,
|
||
length_bits / TARGET_CHAR_BIT);
|
||
}
|
||
|
||
/* Length is zero, regions match. */
|
||
return 0;
|
||
}
|
||
|
||
/* Helper struct for find_first_range_overlap_and_match and
|
||
value_contents_bits_eq. Keep track of which slot of a given ranges
|
||
vector have we last looked at. */
|
||
|
||
struct ranges_and_idx
|
||
{
|
||
/* The ranges. */
|
||
const std::vector<range> *ranges;
|
||
|
||
/* The range we've last found in RANGES. Given ranges are sorted,
|
||
we can start the next lookup here. */
|
||
int idx;
|
||
};
|
||
|
||
/* Helper function for value_contents_bits_eq. Compare LENGTH bits of
|
||
RP1's ranges starting at OFFSET1 bits with LENGTH bits of RP2's
|
||
ranges starting at OFFSET2 bits. Return true if the ranges match
|
||
and fill in *L and *H with the overlapping window relative to
|
||
(both) OFFSET1 or OFFSET2. */
|
||
|
||
static int
|
||
find_first_range_overlap_and_match (struct ranges_and_idx *rp1,
|
||
struct ranges_and_idx *rp2,
|
||
LONGEST offset1, LONGEST offset2,
|
||
ULONGEST length, ULONGEST *l, ULONGEST *h)
|
||
{
|
||
rp1->idx = find_first_range_overlap (rp1->ranges, rp1->idx,
|
||
offset1, length);
|
||
rp2->idx = find_first_range_overlap (rp2->ranges, rp2->idx,
|
||
offset2, length);
|
||
|
||
if (rp1->idx == -1 && rp2->idx == -1)
|
||
{
|
||
*l = length;
|
||
*h = length;
|
||
return 1;
|
||
}
|
||
else if (rp1->idx == -1 || rp2->idx == -1)
|
||
return 0;
|
||
else
|
||
{
|
||
const range *r1, *r2;
|
||
ULONGEST l1, h1;
|
||
ULONGEST l2, h2;
|
||
|
||
r1 = &(*rp1->ranges)[rp1->idx];
|
||
r2 = &(*rp2->ranges)[rp2->idx];
|
||
|
||
/* Get the unavailable windows intersected by the incoming
|
||
ranges. The first and last ranges that overlap the argument
|
||
range may be wider than said incoming arguments ranges. */
|
||
l1 = std::max (offset1, r1->offset);
|
||
h1 = std::min (offset1 + length, r1->offset + r1->length);
|
||
|
||
l2 = std::max (offset2, r2->offset);
|
||
h2 = std::min (offset2 + length, offset2 + r2->length);
|
||
|
||
/* Make them relative to the respective start offsets, so we can
|
||
compare them for equality. */
|
||
l1 -= offset1;
|
||
h1 -= offset1;
|
||
|
||
l2 -= offset2;
|
||
h2 -= offset2;
|
||
|
||
/* Different ranges, no match. */
|
||
if (l1 != l2 || h1 != h2)
|
||
return 0;
|
||
|
||
*h = h1;
|
||
*l = l1;
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
/* Helper function for value_contents_eq. The only difference is that
|
||
this function is bit rather than byte based.
|
||
|
||
Compare LENGTH bits of VAL1's contents starting at OFFSET1 bits
|
||
with LENGTH bits of VAL2's contents starting at OFFSET2 bits.
|
||
Return true if the available bits match. */
|
||
|
||
bool
|
||
value::contents_bits_eq (int offset1, const struct value *val2, int offset2,
|
||
int length) const
|
||
{
|
||
/* Each array element corresponds to a ranges source (unavailable,
|
||
optimized out). '1' is for VAL1, '2' for VAL2. */
|
||
struct ranges_and_idx rp1[2], rp2[2];
|
||
|
||
/* See function description in value.h. */
|
||
gdb_assert (!m_lazy && !val2->m_lazy);
|
||
|
||
/* We shouldn't be trying to compare past the end of the values. */
|
||
gdb_assert (offset1 + length
|
||
<= m_enclosing_type->length () * TARGET_CHAR_BIT);
|
||
gdb_assert (offset2 + length
|
||
<= val2->m_enclosing_type->length () * TARGET_CHAR_BIT);
|
||
|
||
memset (&rp1, 0, sizeof (rp1));
|
||
memset (&rp2, 0, sizeof (rp2));
|
||
rp1[0].ranges = &m_unavailable;
|
||
rp2[0].ranges = &val2->m_unavailable;
|
||
rp1[1].ranges = &m_optimized_out;
|
||
rp2[1].ranges = &val2->m_optimized_out;
|
||
|
||
while (length > 0)
|
||
{
|
||
ULONGEST l = 0, h = 0; /* init for gcc -Wall */
|
||
int i;
|
||
|
||
for (i = 0; i < 2; i++)
|
||
{
|
||
ULONGEST l_tmp, h_tmp;
|
||
|
||
/* The contents only match equal if the invalid/unavailable
|
||
contents ranges match as well. */
|
||
if (!find_first_range_overlap_and_match (&rp1[i], &rp2[i],
|
||
offset1, offset2, length,
|
||
&l_tmp, &h_tmp))
|
||
return false;
|
||
|
||
/* We're interested in the lowest/first range found. */
|
||
if (i == 0 || l_tmp < l)
|
||
{
|
||
l = l_tmp;
|
||
h = h_tmp;
|
||
}
|
||
}
|
||
|
||
/* Compare the available/valid contents. */
|
||
if (memcmp_with_bit_offsets (m_contents.get (), offset1,
|
||
val2->m_contents.get (), offset2, l) != 0)
|
||
return false;
|
||
|
||
length -= h;
|
||
offset1 += h;
|
||
offset2 += h;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
bool
|
||
value::contents_eq (LONGEST offset1,
|
||
const struct value *val2, LONGEST offset2,
|
||
LONGEST length) const
|
||
{
|
||
return contents_bits_eq (offset1 * TARGET_CHAR_BIT,
|
||
val2, offset2 * TARGET_CHAR_BIT,
|
||
length * TARGET_CHAR_BIT);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
bool
|
||
value::contents_eq (const struct value *val2) const
|
||
{
|
||
ULONGEST len1 = check_typedef (enclosing_type ())->length ();
|
||
ULONGEST len2 = check_typedef (val2->enclosing_type ())->length ();
|
||
if (len1 != len2)
|
||
return false;
|
||
return contents_eq (0, val2, 0, len1);
|
||
}
|
||
|
||
/* The value-history records all the values printed by print commands
|
||
during this session. */
|
||
|
||
static std::vector<value_ref_ptr> value_history;
|
||
|
||
|
||
/* List of all value objects currently allocated
|
||
(except for those released by calls to release_value)
|
||
This is so they can be freed after each command. */
|
||
|
||
static std::vector<value_ref_ptr> all_values;
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::allocate_lazy (struct type *type)
|
||
{
|
||
struct value *val;
|
||
|
||
/* Call check_typedef on our type to make sure that, if TYPE
|
||
is a TYPE_CODE_TYPEDEF, its length is set to the length
|
||
of the target type instead of zero. However, we do not
|
||
replace the typedef type by the target type, because we want
|
||
to keep the typedef in order to be able to set the VAL's type
|
||
description correctly. */
|
||
check_typedef (type);
|
||
|
||
val = new struct value (type);
|
||
|
||
/* Values start out on the all_values chain. */
|
||
all_values.emplace_back (val);
|
||
|
||
return val;
|
||
}
|
||
|
||
/* The maximum size, in bytes, that GDB will try to allocate for a value.
|
||
The initial value of 64k was not selected for any specific reason, it is
|
||
just a reasonable starting point. */
|
||
|
||
static int max_value_size = 65536; /* 64k bytes */
|
||
|
||
/* It is critical that the MAX_VALUE_SIZE is at least as big as the size of
|
||
LONGEST, otherwise GDB will not be able to parse integer values from the
|
||
CLI; for example if the MAX_VALUE_SIZE could be set to 1 then GDB would
|
||
be unable to parse "set max-value-size 2".
|
||
|
||
As we want a consistent GDB experience across hosts with different sizes
|
||
of LONGEST, this arbitrary minimum value was selected, so long as this
|
||
is bigger than LONGEST on all GDB supported hosts we're fine. */
|
||
|
||
#define MIN_VALUE_FOR_MAX_VALUE_SIZE 16
|
||
static_assert (sizeof (LONGEST) <= MIN_VALUE_FOR_MAX_VALUE_SIZE);
|
||
|
||
/* Implement the "set max-value-size" command. */
|
||
|
||
static void
|
||
set_max_value_size (const char *args, int from_tty,
|
||
struct cmd_list_element *c)
|
||
{
|
||
gdb_assert (max_value_size == -1 || max_value_size >= 0);
|
||
|
||
if (max_value_size > -1 && max_value_size < MIN_VALUE_FOR_MAX_VALUE_SIZE)
|
||
{
|
||
max_value_size = MIN_VALUE_FOR_MAX_VALUE_SIZE;
|
||
error (_("max-value-size set too low, increasing to %d bytes"),
|
||
max_value_size);
|
||
}
|
||
}
|
||
|
||
/* Implement the "show max-value-size" command. */
|
||
|
||
static void
|
||
show_max_value_size (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
if (max_value_size == -1)
|
||
gdb_printf (file, _("Maximum value size is unlimited.\n"));
|
||
else
|
||
gdb_printf (file, _("Maximum value size is %d bytes.\n"),
|
||
max_value_size);
|
||
}
|
||
|
||
/* Called before we attempt to allocate or reallocate a buffer for the
|
||
contents of a value. TYPE is the type of the value for which we are
|
||
allocating the buffer. If the buffer is too large (based on the user
|
||
controllable setting) then throw an error. If this function returns
|
||
then we should attempt to allocate the buffer. */
|
||
|
||
static void
|
||
check_type_length_before_alloc (const struct type *type)
|
||
{
|
||
ULONGEST length = type->length ();
|
||
|
||
if (exceeds_max_value_size (length))
|
||
{
|
||
if (type->name () != NULL)
|
||
error (_("value of type `%s' requires %s bytes, which is more "
|
||
"than max-value-size"), type->name (), pulongest (length));
|
||
else
|
||
error (_("value requires %s bytes, which is more than "
|
||
"max-value-size"), pulongest (length));
|
||
}
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
bool
|
||
exceeds_max_value_size (ULONGEST length)
|
||
{
|
||
return max_value_size > -1 && length > max_value_size;
|
||
}
|
||
|
||
/* When this has a value, it is used to limit the number of array elements
|
||
of an array that are loaded into memory when an array value is made
|
||
non-lazy. */
|
||
static std::optional<int> array_length_limiting_element_count;
|
||
|
||
/* See value.h. */
|
||
scoped_array_length_limiting::scoped_array_length_limiting (int elements)
|
||
{
|
||
m_old_value = array_length_limiting_element_count;
|
||
array_length_limiting_element_count.emplace (elements);
|
||
}
|
||
|
||
/* See value.h. */
|
||
scoped_array_length_limiting::~scoped_array_length_limiting ()
|
||
{
|
||
array_length_limiting_element_count = m_old_value;
|
||
}
|
||
|
||
/* Find the inner element type for ARRAY_TYPE. */
|
||
|
||
static struct type *
|
||
find_array_element_type (struct type *array_type)
|
||
{
|
||
array_type = check_typedef (array_type);
|
||
gdb_assert (array_type->code () == TYPE_CODE_ARRAY);
|
||
|
||
if (current_language->la_language == language_fortran)
|
||
while (array_type->code () == TYPE_CODE_ARRAY)
|
||
{
|
||
array_type = array_type->target_type ();
|
||
array_type = check_typedef (array_type);
|
||
}
|
||
else
|
||
{
|
||
array_type = array_type->target_type ();
|
||
array_type = check_typedef (array_type);
|
||
}
|
||
|
||
return array_type;
|
||
}
|
||
|
||
/* Return the limited length of ARRAY_TYPE, which must be of
|
||
TYPE_CODE_ARRAY. This function can only be called when the global
|
||
ARRAY_LENGTH_LIMITING_ELEMENT_COUNT has a value.
|
||
|
||
The limited length of an array is the smallest of either (1) the total
|
||
size of the array type, or (2) the array target type multiplies by the
|
||
array_length_limiting_element_count. */
|
||
|
||
static ULONGEST
|
||
calculate_limited_array_length (struct type *array_type)
|
||
{
|
||
gdb_assert (array_length_limiting_element_count.has_value ());
|
||
|
||
array_type = check_typedef (array_type);
|
||
gdb_assert (array_type->code () == TYPE_CODE_ARRAY);
|
||
|
||
struct type *elm_type = find_array_element_type (array_type);
|
||
ULONGEST len = (elm_type->length ()
|
||
* (*array_length_limiting_element_count));
|
||
len = std::min (len, array_type->length ());
|
||
|
||
return len;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
bool
|
||
value::set_limited_array_length ()
|
||
{
|
||
ULONGEST limit = m_limited_length;
|
||
ULONGEST len = type ()->length ();
|
||
|
||
if (array_length_limiting_element_count.has_value ())
|
||
len = calculate_limited_array_length (type ());
|
||
|
||
if (limit != 0 && len > limit)
|
||
len = limit;
|
||
if (len > max_value_size)
|
||
return false;
|
||
|
||
m_limited_length = max_value_size;
|
||
return true;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::allocate_contents (bool check_size)
|
||
{
|
||
if (!m_contents)
|
||
{
|
||
struct type *enc_type = enclosing_type ();
|
||
ULONGEST len = enc_type->length ();
|
||
|
||
if (check_size)
|
||
{
|
||
/* If we are allocating the contents of an array, which
|
||
is greater in size than max_value_size, and there is
|
||
an element limit in effect, then we can possibly try
|
||
to load only a sub-set of the array contents into
|
||
GDB's memory. */
|
||
if (type () == enc_type
|
||
&& type ()->code () == TYPE_CODE_ARRAY
|
||
&& len > max_value_size
|
||
&& set_limited_array_length ())
|
||
len = m_limited_length;
|
||
else
|
||
check_type_length_before_alloc (enc_type);
|
||
}
|
||
|
||
m_contents.reset ((gdb_byte *) xzalloc (len));
|
||
}
|
||
}
|
||
|
||
/* Allocate a value and its contents for type TYPE. If CHECK_SIZE is true,
|
||
then apply the usual max-value-size checks. */
|
||
|
||
struct value *
|
||
value::allocate (struct type *type, bool check_size)
|
||
{
|
||
struct value *val = value::allocate_lazy (type);
|
||
|
||
val->allocate_contents (check_size);
|
||
val->m_lazy = false;
|
||
return val;
|
||
}
|
||
|
||
/* Allocate a value and its contents for type TYPE. */
|
||
|
||
struct value *
|
||
value::allocate (struct type *type)
|
||
{
|
||
return allocate (type, true);
|
||
}
|
||
|
||
/* See value.h */
|
||
|
||
value *
|
||
value::allocate_register_lazy (const frame_info_ptr &initial_next_frame,
|
||
int regnum, struct type *type)
|
||
{
|
||
if (type == nullptr)
|
||
type = register_type (frame_unwind_arch (initial_next_frame), regnum);
|
||
|
||
value *result = value::allocate_lazy (type);
|
||
|
||
result->set_lval (lval_register);
|
||
result->m_location.reg.regnum = regnum;
|
||
|
||
/* If this register value is created during unwind (while computing a frame
|
||
id), and NEXT_FRAME is a frame inlined in the frame being unwound, then
|
||
NEXT_FRAME will not have a valid frame id yet. Find the next non-inline
|
||
frame (possibly the sentinel frame). This is where registers are unwound
|
||
from anyway. */
|
||
frame_info_ptr next_frame = initial_next_frame;
|
||
while (get_frame_type (next_frame) == INLINE_FRAME)
|
||
next_frame = get_next_frame_sentinel_okay (next_frame);
|
||
|
||
result->m_location.reg.next_frame_id = get_frame_id (next_frame);
|
||
|
||
/* We should have a next frame with a valid id. */
|
||
gdb_assert (frame_id_p (result->m_location.reg.next_frame_id));
|
||
|
||
return result;
|
||
}
|
||
|
||
/* See value.h */
|
||
|
||
value *
|
||
value::allocate_register (const frame_info_ptr &next_frame, int regnum,
|
||
struct type *type)
|
||
{
|
||
value *result = value::allocate_register_lazy (next_frame, regnum, type);
|
||
result->set_lazy (false);
|
||
return result;
|
||
}
|
||
|
||
/* Allocate a value that has the correct length
|
||
for COUNT repetitions of type TYPE. */
|
||
|
||
struct value *
|
||
allocate_repeat_value (struct type *type, int count)
|
||
{
|
||
/* Despite the fact that we are really creating an array of TYPE here, we
|
||
use the string lower bound as the array lower bound. This seems to
|
||
work fine for now. */
|
||
int low_bound = current_language->string_lower_bound ();
|
||
/* FIXME-type-allocation: need a way to free this type when we are
|
||
done with it. */
|
||
struct type *array_type
|
||
= lookup_array_range_type (type, low_bound, count + low_bound - 1);
|
||
|
||
return value::allocate (array_type);
|
||
}
|
||
|
||
struct value *
|
||
value::allocate_computed (struct type *type,
|
||
const struct lval_funcs *funcs,
|
||
void *closure)
|
||
{
|
||
struct value *v = value::allocate_lazy (type);
|
||
|
||
v->set_lval (lval_computed);
|
||
v->m_location.computed.funcs = funcs;
|
||
v->m_location.computed.closure = closure;
|
||
|
||
return v;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::allocate_optimized_out (struct type *type)
|
||
{
|
||
struct value *retval = value::allocate_lazy (type);
|
||
|
||
retval->mark_bytes_optimized_out (0, type->length ());
|
||
retval->set_lazy (false);
|
||
return retval;
|
||
}
|
||
|
||
/* Accessor methods. */
|
||
|
||
gdb::array_view<gdb_byte>
|
||
value::contents_raw ()
|
||
{
|
||
int unit_size = gdbarch_addressable_memory_unit_size (arch ());
|
||
|
||
allocate_contents (true);
|
||
|
||
ULONGEST length = type ()->length ();
|
||
return gdb::make_array_view
|
||
(m_contents.get () + m_embedded_offset * unit_size, length);
|
||
}
|
||
|
||
gdb::array_view<gdb_byte>
|
||
value::contents_all_raw ()
|
||
{
|
||
allocate_contents (true);
|
||
|
||
ULONGEST length = enclosing_type ()->length ();
|
||
return gdb::make_array_view (m_contents.get (), length);
|
||
}
|
||
|
||
/* Look at value.h for description. */
|
||
|
||
struct type *
|
||
value_actual_type (struct value *value, int resolve_simple_types,
|
||
int *real_type_found)
|
||
{
|
||
struct value_print_options opts;
|
||
struct type *result;
|
||
|
||
get_user_print_options (&opts);
|
||
|
||
if (real_type_found)
|
||
*real_type_found = 0;
|
||
result = value->type ();
|
||
if (opts.objectprint)
|
||
{
|
||
/* If result's target type is TYPE_CODE_STRUCT, proceed to
|
||
fetch its rtti type. */
|
||
if (result->is_pointer_or_reference ()
|
||
&& (check_typedef (result->target_type ())->code ()
|
||
== TYPE_CODE_STRUCT)
|
||
&& !value->optimized_out ())
|
||
{
|
||
struct type *real_type;
|
||
|
||
real_type = value_rtti_indirect_type (value, NULL, NULL, NULL);
|
||
if (real_type)
|
||
{
|
||
if (real_type_found)
|
||
*real_type_found = 1;
|
||
result = real_type;
|
||
}
|
||
}
|
||
else if (resolve_simple_types)
|
||
{
|
||
if (real_type_found)
|
||
*real_type_found = 1;
|
||
result = value->enclosing_type ();
|
||
}
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
void
|
||
error_value_optimized_out (void)
|
||
{
|
||
throw_error (OPTIMIZED_OUT_ERROR, _("value has been optimized out"));
|
||
}
|
||
|
||
void
|
||
value::require_not_optimized_out () const
|
||
{
|
||
if (!m_optimized_out.empty ())
|
||
{
|
||
if (m_lval == lval_register)
|
||
throw_error (OPTIMIZED_OUT_ERROR,
|
||
_("register has not been saved in frame"));
|
||
else
|
||
error_value_optimized_out ();
|
||
}
|
||
}
|
||
|
||
void
|
||
value::require_available () const
|
||
{
|
||
if (!m_unavailable.empty ())
|
||
throw_error (NOT_AVAILABLE_ERROR, _("value is not available"));
|
||
}
|
||
|
||
gdb::array_view<const gdb_byte>
|
||
value::contents_for_printing ()
|
||
{
|
||
if (m_lazy)
|
||
fetch_lazy ();
|
||
|
||
ULONGEST length = enclosing_type ()->length ();
|
||
return gdb::make_array_view (m_contents.get (), length);
|
||
}
|
||
|
||
gdb::array_view<const gdb_byte>
|
||
value::contents_for_printing () const
|
||
{
|
||
gdb_assert (!m_lazy);
|
||
|
||
ULONGEST length = enclosing_type ()->length ();
|
||
return gdb::make_array_view (m_contents.get (), length);
|
||
}
|
||
|
||
gdb::array_view<const gdb_byte>
|
||
value::contents_all ()
|
||
{
|
||
gdb::array_view<const gdb_byte> result = contents_for_printing ();
|
||
require_not_optimized_out ();
|
||
require_available ();
|
||
return result;
|
||
}
|
||
|
||
/* Copy ranges in SRC_RANGE that overlap [SRC_BIT_OFFSET,
|
||
SRC_BIT_OFFSET+BIT_LENGTH) ranges into *DST_RANGE, adjusted. */
|
||
|
||
static void
|
||
ranges_copy_adjusted (std::vector<range> *dst_range, int dst_bit_offset,
|
||
const std::vector<range> &src_range, int src_bit_offset,
|
||
unsigned int bit_length)
|
||
{
|
||
for (const range &r : src_range)
|
||
{
|
||
LONGEST h, l;
|
||
|
||
l = std::max (r.offset, (LONGEST) src_bit_offset);
|
||
h = std::min ((LONGEST) (r.offset + r.length),
|
||
(LONGEST) src_bit_offset + bit_length);
|
||
|
||
if (l < h)
|
||
insert_into_bit_range_vector (dst_range,
|
||
dst_bit_offset + (l - src_bit_offset),
|
||
h - l);
|
||
}
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::ranges_copy_adjusted (struct value *dst, int dst_bit_offset,
|
||
int src_bit_offset, int bit_length) const
|
||
{
|
||
::ranges_copy_adjusted (&dst->m_unavailable, dst_bit_offset,
|
||
m_unavailable, src_bit_offset,
|
||
bit_length);
|
||
::ranges_copy_adjusted (&dst->m_optimized_out, dst_bit_offset,
|
||
m_optimized_out, src_bit_offset,
|
||
bit_length);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::contents_copy_raw (struct value *dst, LONGEST dst_offset,
|
||
LONGEST src_offset, LONGEST length)
|
||
{
|
||
LONGEST src_bit_offset, dst_bit_offset, bit_length;
|
||
int unit_size = gdbarch_addressable_memory_unit_size (arch ());
|
||
|
||
/* A lazy DST would make that this copy operation useless, since as
|
||
soon as DST's contents were un-lazied (by a later value_contents
|
||
call, say), the contents would be overwritten. A lazy SRC would
|
||
mean we'd be copying garbage. */
|
||
gdb_assert (!dst->m_lazy && !m_lazy);
|
||
|
||
ULONGEST copy_length = length;
|
||
ULONGEST limit = m_limited_length;
|
||
if (limit > 0 && src_offset + length > limit)
|
||
copy_length = src_offset > limit ? 0 : limit - src_offset;
|
||
|
||
/* The overwritten DST range gets unavailability ORed in, not
|
||
replaced. Make sure to remember to implement replacing if it
|
||
turns out actually necessary. */
|
||
gdb_assert (dst->bytes_available (dst_offset, length));
|
||
gdb_assert (!dst->bits_any_optimized_out (TARGET_CHAR_BIT * dst_offset,
|
||
TARGET_CHAR_BIT * length));
|
||
|
||
if ((src_offset + copy_length) * unit_size > enclosing_type ()-> length ())
|
||
error (_("access outside bounds of object"));
|
||
|
||
/* Copy the data. */
|
||
gdb::array_view<gdb_byte> dst_contents
|
||
= dst->contents_all_raw ().slice (dst_offset * unit_size,
|
||
copy_length * unit_size);
|
||
gdb::array_view<const gdb_byte> src_contents
|
||
= contents_all_raw ().slice (src_offset * unit_size,
|
||
copy_length * unit_size);
|
||
gdb::copy (src_contents, dst_contents);
|
||
|
||
/* Copy the meta-data, adjusted. */
|
||
src_bit_offset = src_offset * unit_size * HOST_CHAR_BIT;
|
||
dst_bit_offset = dst_offset * unit_size * HOST_CHAR_BIT;
|
||
bit_length = length * unit_size * HOST_CHAR_BIT;
|
||
|
||
ranges_copy_adjusted (dst, dst_bit_offset,
|
||
src_bit_offset, bit_length);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::contents_copy_raw_bitwise (struct value *dst, LONGEST dst_bit_offset,
|
||
LONGEST src_bit_offset,
|
||
LONGEST bit_length)
|
||
{
|
||
/* A lazy DST would make that this copy operation useless, since as
|
||
soon as DST's contents were un-lazied (by a later value_contents
|
||
call, say), the contents would be overwritten. A lazy SRC would
|
||
mean we'd be copying garbage. */
|
||
gdb_assert (!dst->m_lazy && !m_lazy);
|
||
|
||
ULONGEST copy_bit_length = bit_length;
|
||
ULONGEST bit_limit = m_limited_length * TARGET_CHAR_BIT;
|
||
if (bit_limit > 0 && src_bit_offset + bit_length > bit_limit)
|
||
copy_bit_length = (src_bit_offset > bit_limit ? 0
|
||
: bit_limit - src_bit_offset);
|
||
|
||
/* The overwritten DST range gets unavailability ORed in, not
|
||
replaced. Make sure to remember to implement replacing if it
|
||
turns out actually necessary. */
|
||
LONGEST dst_offset = dst_bit_offset / TARGET_CHAR_BIT;
|
||
LONGEST length = bit_length / TARGET_CHAR_BIT;
|
||
gdb_assert (dst->bytes_available (dst_offset, length));
|
||
gdb_assert (!dst->bits_any_optimized_out (dst_bit_offset,
|
||
bit_length));
|
||
|
||
/* Copy the data. */
|
||
gdb::array_view<gdb_byte> dst_contents = dst->contents_all_raw ();
|
||
gdb::array_view<const gdb_byte> src_contents = contents_all_raw ();
|
||
copy_bitwise (dst_contents.data (), dst_bit_offset,
|
||
src_contents.data (), src_bit_offset,
|
||
copy_bit_length,
|
||
type_byte_order (type ()) == BFD_ENDIAN_BIG);
|
||
|
||
/* Copy the meta-data. */
|
||
ranges_copy_adjusted (dst, dst_bit_offset, src_bit_offset, bit_length);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::contents_copy (struct value *dst, LONGEST dst_offset,
|
||
LONGEST src_offset, LONGEST length)
|
||
{
|
||
if (m_lazy)
|
||
fetch_lazy ();
|
||
|
||
contents_copy_raw (dst, dst_offset, src_offset, length);
|
||
}
|
||
|
||
gdb::array_view<const gdb_byte>
|
||
value::contents ()
|
||
{
|
||
gdb::array_view<const gdb_byte> result = contents_writeable ();
|
||
require_not_optimized_out ();
|
||
require_available ();
|
||
return result;
|
||
}
|
||
|
||
gdb::array_view<gdb_byte>
|
||
value::contents_writeable ()
|
||
{
|
||
if (m_lazy)
|
||
fetch_lazy ();
|
||
return contents_raw ();
|
||
}
|
||
|
||
bool
|
||
value::optimized_out ()
|
||
{
|
||
if (m_lazy)
|
||
{
|
||
/* See if we can compute the result without fetching the
|
||
value. */
|
||
if (this->lval () == lval_memory)
|
||
return false;
|
||
else if (this->lval () == lval_computed)
|
||
{
|
||
const struct lval_funcs *funcs = m_location.computed.funcs;
|
||
|
||
if (funcs->is_optimized_out != nullptr)
|
||
return funcs->is_optimized_out (this);
|
||
}
|
||
|
||
/* Fall back to fetching. */
|
||
try
|
||
{
|
||
fetch_lazy ();
|
||
}
|
||
catch (const gdb_exception_error &ex)
|
||
{
|
||
switch (ex.error)
|
||
{
|
||
case MEMORY_ERROR:
|
||
case OPTIMIZED_OUT_ERROR:
|
||
case NOT_AVAILABLE_ERROR:
|
||
/* These can normally happen when we try to access an
|
||
optimized out or unavailable register, either in a
|
||
physical register or spilled to memory. */
|
||
break;
|
||
default:
|
||
throw;
|
||
}
|
||
}
|
||
}
|
||
|
||
return !m_optimized_out.empty ();
|
||
}
|
||
|
||
/* Mark contents of VALUE as optimized out, starting at OFFSET bytes, and
|
||
the following LENGTH bytes. */
|
||
|
||
void
|
||
value::mark_bytes_optimized_out (int offset, int length)
|
||
{
|
||
mark_bits_optimized_out (offset * TARGET_CHAR_BIT,
|
||
length * TARGET_CHAR_BIT);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::mark_bits_optimized_out (LONGEST offset, LONGEST length)
|
||
{
|
||
insert_into_bit_range_vector (&m_optimized_out, offset, length);
|
||
}
|
||
|
||
bool
|
||
value::bits_synthetic_pointer (LONGEST offset, LONGEST length) const
|
||
{
|
||
if (m_lval != lval_computed
|
||
|| !m_location.computed.funcs->check_synthetic_pointer)
|
||
return false;
|
||
return m_location.computed.funcs->check_synthetic_pointer (this, offset,
|
||
length);
|
||
}
|
||
|
||
const struct lval_funcs *
|
||
value::computed_funcs () const
|
||
{
|
||
gdb_assert (m_lval == lval_computed);
|
||
|
||
return m_location.computed.funcs;
|
||
}
|
||
|
||
void *
|
||
value::computed_closure () const
|
||
{
|
||
gdb_assert (m_lval == lval_computed);
|
||
|
||
return m_location.computed.closure;
|
||
}
|
||
|
||
CORE_ADDR
|
||
value::address () const
|
||
{
|
||
if (m_lval != lval_memory)
|
||
return 0;
|
||
if (m_parent != NULL)
|
||
return m_parent->address () + m_offset;
|
||
if (NULL != TYPE_DATA_LOCATION (type ()))
|
||
{
|
||
gdb_assert (TYPE_DATA_LOCATION (type ())->is_constant ());
|
||
return TYPE_DATA_LOCATION_ADDR (type ());
|
||
}
|
||
|
||
return m_location.address + m_offset;
|
||
}
|
||
|
||
CORE_ADDR
|
||
value::raw_address () const
|
||
{
|
||
if (m_lval != lval_memory)
|
||
return 0;
|
||
return m_location.address;
|
||
}
|
||
|
||
void
|
||
value::set_address (CORE_ADDR addr)
|
||
{
|
||
gdb_assert (m_lval == lval_memory);
|
||
m_location.address = addr;
|
||
}
|
||
|
||
/* Return a mark in the value chain. All values allocated after the
|
||
mark is obtained (except for those released) are subject to being freed
|
||
if a subsequent value_free_to_mark is passed the mark. */
|
||
struct value *
|
||
value_mark (void)
|
||
{
|
||
if (all_values.empty ())
|
||
return nullptr;
|
||
return all_values.back ().get ();
|
||
}
|
||
|
||
/* Release a reference to VAL, which was acquired with value_incref.
|
||
This function is also called to deallocate values from the value
|
||
chain. */
|
||
|
||
void
|
||
value::decref ()
|
||
{
|
||
gdb_assert (m_reference_count > 0);
|
||
m_reference_count--;
|
||
if (m_reference_count == 0)
|
||
delete this;
|
||
}
|
||
|
||
/* Free all values allocated since MARK was obtained by value_mark
|
||
(except for those released). */
|
||
void
|
||
value_free_to_mark (const struct value *mark)
|
||
{
|
||
auto iter = std::find (all_values.begin (), all_values.end (), mark);
|
||
if (iter == all_values.end ())
|
||
all_values.clear ();
|
||
else
|
||
all_values.erase (iter + 1, all_values.end ());
|
||
}
|
||
|
||
/* Remove VAL from the chain all_values
|
||
so it will not be freed automatically. */
|
||
|
||
value_ref_ptr
|
||
release_value (struct value *val)
|
||
{
|
||
if (val == nullptr)
|
||
return value_ref_ptr ();
|
||
|
||
std::vector<value_ref_ptr>::reverse_iterator iter;
|
||
for (iter = all_values.rbegin (); iter != all_values.rend (); ++iter)
|
||
{
|
||
if (*iter == val)
|
||
{
|
||
value_ref_ptr result = *iter;
|
||
all_values.erase (iter.base () - 1);
|
||
return result;
|
||
}
|
||
}
|
||
|
||
/* We must always return an owned reference. Normally this happens
|
||
because we transfer the reference from the value chain, but in
|
||
this case the value was not on the chain. */
|
||
return value_ref_ptr::new_reference (val);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
std::vector<value_ref_ptr>
|
||
value_release_to_mark (const struct value *mark)
|
||
{
|
||
std::vector<value_ref_ptr> result;
|
||
|
||
auto iter = std::find (all_values.begin (), all_values.end (), mark);
|
||
if (iter == all_values.end ())
|
||
std::swap (result, all_values);
|
||
else
|
||
{
|
||
std::move (iter + 1, all_values.end (), std::back_inserter (result));
|
||
all_values.erase (iter + 1, all_values.end ());
|
||
}
|
||
std::reverse (result.begin (), result.end ());
|
||
return result;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::copy () const
|
||
{
|
||
struct type *encl_type = enclosing_type ();
|
||
struct value *val;
|
||
|
||
val = value::allocate_lazy (encl_type);
|
||
val->m_type = m_type;
|
||
val->set_lval (m_lval);
|
||
val->m_location = m_location;
|
||
val->m_offset = m_offset;
|
||
val->m_bitpos = m_bitpos;
|
||
val->m_bitsize = m_bitsize;
|
||
val->m_lazy = m_lazy;
|
||
val->m_embedded_offset = embedded_offset ();
|
||
val->m_pointed_to_offset = m_pointed_to_offset;
|
||
val->m_modifiable = m_modifiable;
|
||
val->m_stack = m_stack;
|
||
val->m_is_zero = m_is_zero;
|
||
val->m_in_history = m_in_history;
|
||
val->m_initialized = m_initialized;
|
||
val->m_unavailable = m_unavailable;
|
||
val->m_optimized_out = m_optimized_out;
|
||
val->m_parent = m_parent;
|
||
val->m_limited_length = m_limited_length;
|
||
|
||
if (!val->lazy ()
|
||
&& !(val->entirely_optimized_out ()
|
||
|| val->entirely_unavailable ()))
|
||
{
|
||
ULONGEST length = val->m_limited_length;
|
||
if (length == 0)
|
||
length = val->enclosing_type ()->length ();
|
||
|
||
gdb_assert (m_contents != nullptr);
|
||
const auto &arg_view
|
||
= gdb::make_array_view (m_contents.get (), length);
|
||
|
||
val->allocate_contents (false);
|
||
gdb::array_view<gdb_byte> val_contents
|
||
= val->contents_all_raw ().slice (0, length);
|
||
|
||
gdb::copy (arg_view, val_contents);
|
||
}
|
||
|
||
if (val->lval () == lval_computed)
|
||
{
|
||
const struct lval_funcs *funcs = val->m_location.computed.funcs;
|
||
|
||
if (funcs->copy_closure)
|
||
val->m_location.computed.closure = funcs->copy_closure (val);
|
||
}
|
||
return val;
|
||
}
|
||
|
||
/* Return a "const" and/or "volatile" qualified version of the value V.
|
||
If CNST is true, then the returned value will be qualified with
|
||
"const".
|
||
if VOLTL is true, then the returned value will be qualified with
|
||
"volatile". */
|
||
|
||
struct value *
|
||
make_cv_value (int cnst, int voltl, struct value *v)
|
||
{
|
||
struct type *val_type = v->type ();
|
||
struct type *m_enclosing_type = v->enclosing_type ();
|
||
struct value *cv_val = v->copy ();
|
||
|
||
cv_val->deprecated_set_type (make_cv_type (cnst, voltl, val_type, NULL));
|
||
cv_val->set_enclosing_type (make_cv_type (cnst, voltl, m_enclosing_type, NULL));
|
||
|
||
return cv_val;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::non_lval ()
|
||
{
|
||
if (this->lval () != not_lval)
|
||
{
|
||
struct type *enc_type = enclosing_type ();
|
||
struct value *val = value::allocate (enc_type);
|
||
|
||
gdb::copy (contents_all (), val->contents_all_raw ());
|
||
val->m_type = m_type;
|
||
val->set_embedded_offset (embedded_offset ());
|
||
val->set_pointed_to_offset (pointed_to_offset ());
|
||
return val;
|
||
}
|
||
return this;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::force_lval (CORE_ADDR addr)
|
||
{
|
||
gdb_assert (this->lval () == not_lval);
|
||
|
||
write_memory (addr, contents_raw ().data (), type ()->length ());
|
||
m_lval = lval_memory;
|
||
m_location.address = addr;
|
||
}
|
||
|
||
void
|
||
value::set_component_location (const struct value *whole)
|
||
{
|
||
struct type *type;
|
||
|
||
gdb_assert (whole->m_lval != lval_xcallable);
|
||
|
||
if (whole->m_lval == lval_internalvar)
|
||
m_lval = lval_internalvar_component;
|
||
else
|
||
m_lval = whole->m_lval;
|
||
|
||
m_location = whole->m_location;
|
||
if (whole->m_lval == lval_computed)
|
||
{
|
||
const struct lval_funcs *funcs = whole->m_location.computed.funcs;
|
||
|
||
if (funcs->copy_closure)
|
||
m_location.computed.closure = funcs->copy_closure (whole);
|
||
}
|
||
|
||
/* If the WHOLE value has a dynamically resolved location property then
|
||
update the address of the COMPONENT. */
|
||
type = whole->type ();
|
||
if (NULL != TYPE_DATA_LOCATION (type)
|
||
&& TYPE_DATA_LOCATION (type)->is_constant ())
|
||
set_address (TYPE_DATA_LOCATION_ADDR (type));
|
||
|
||
/* Similarly, if the COMPONENT value has a dynamically resolved location
|
||
property then update its address. */
|
||
type = this->type ();
|
||
if (NULL != TYPE_DATA_LOCATION (type)
|
||
&& TYPE_DATA_LOCATION (type)->is_constant ())
|
||
{
|
||
/* If the COMPONENT has a dynamic location, and is an
|
||
lval_internalvar_component, then we change it to a lval_memory.
|
||
|
||
Usually a component of an internalvar is created non-lazy, and has
|
||
its content immediately copied from the parent internalvar.
|
||
However, for components with a dynamic location, the content of
|
||
the component is not contained within the parent, but is instead
|
||
accessed indirectly. Further, the component will be created as a
|
||
lazy value.
|
||
|
||
By changing the type of the component to lval_memory we ensure
|
||
that value_fetch_lazy can successfully load the component.
|
||
|
||
This solution isn't ideal, but a real fix would require values to
|
||
carry around both the parent value contents, and the contents of
|
||
any dynamic fields within the parent. This is a substantial
|
||
change to how values work in GDB. */
|
||
if (this->lval () == lval_internalvar_component)
|
||
{
|
||
gdb_assert (lazy ());
|
||
m_lval = lval_memory;
|
||
}
|
||
else
|
||
gdb_assert (this->lval () == lval_memory);
|
||
set_address (TYPE_DATA_LOCATION_ADDR (type));
|
||
}
|
||
}
|
||
|
||
/* Access to the value history. */
|
||
|
||
/* Record a new value in the value history.
|
||
Returns the absolute history index of the entry. */
|
||
|
||
int
|
||
value::record_latest ()
|
||
{
|
||
/* We don't want this value to have anything to do with the inferior anymore.
|
||
In particular, "set $1 = 50" should not affect the variable from which
|
||
the value was taken, and fast watchpoints should be able to assume that
|
||
a value on the value history never changes. */
|
||
if (lazy ())
|
||
{
|
||
/* We know that this is a _huge_ array, any attempt to fetch this
|
||
is going to cause GDB to throw an error. However, to allow
|
||
the array to still be displayed we fetch its contents up to
|
||
`max_value_size' and mark anything beyond "unavailable" in
|
||
the history. */
|
||
if (m_type->code () == TYPE_CODE_ARRAY
|
||
&& m_type->length () > max_value_size
|
||
&& array_length_limiting_element_count.has_value ()
|
||
&& m_enclosing_type == m_type
|
||
&& calculate_limited_array_length (m_type) <= max_value_size)
|
||
m_limited_length = max_value_size;
|
||
|
||
fetch_lazy ();
|
||
}
|
||
|
||
ULONGEST limit = m_limited_length;
|
||
if (limit != 0)
|
||
mark_bytes_unavailable (limit, m_enclosing_type->length () - limit);
|
||
|
||
/* Mark the value as recorded in the history for the availability check. */
|
||
m_in_history = true;
|
||
|
||
/* We preserve VALUE_LVAL so that the user can find out where it was fetched
|
||
from. This is a bit dubious, because then *&$1 does not just return $1
|
||
but the current contents of that location. c'est la vie... */
|
||
set_modifiable (false);
|
||
|
||
value_history.push_back (release_value (this));
|
||
|
||
return value_history.size ();
|
||
}
|
||
|
||
/* Return a copy of the value in the history with sequence number NUM. */
|
||
|
||
struct value *
|
||
access_value_history (int num)
|
||
{
|
||
int absnum = num;
|
||
|
||
if (absnum <= 0)
|
||
absnum += value_history.size ();
|
||
|
||
if (absnum <= 0)
|
||
{
|
||
if (num == 0)
|
||
error (_("The history is empty."));
|
||
else if (num == 1)
|
||
error (_("There is only one value in the history."));
|
||
else
|
||
error (_("History does not go back to $$%d."), -num);
|
||
}
|
||
if (absnum > value_history.size ())
|
||
error (_("History has not yet reached $%d."), absnum);
|
||
|
||
absnum--;
|
||
|
||
return value_history[absnum]->copy ();
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
ULONGEST
|
||
value_history_count ()
|
||
{
|
||
return value_history.size ();
|
||
}
|
||
|
||
static void
|
||
show_values (const char *num_exp, int from_tty)
|
||
{
|
||
int i;
|
||
struct value *val;
|
||
static int num = 1;
|
||
|
||
if (num_exp)
|
||
{
|
||
/* "show values +" should print from the stored position.
|
||
"show values <exp>" should print around value number <exp>. */
|
||
if (num_exp[0] != '+' || num_exp[1] != '\0')
|
||
num = parse_and_eval_long (num_exp) - 5;
|
||
}
|
||
else
|
||
{
|
||
/* "show values" means print the last 10 values. */
|
||
num = value_history.size () - 9;
|
||
}
|
||
|
||
if (num <= 0)
|
||
num = 1;
|
||
|
||
for (i = num; i < num + 10 && i <= value_history.size (); i++)
|
||
{
|
||
struct value_print_options opts;
|
||
|
||
val = access_value_history (i);
|
||
gdb_printf (("$%d = "), i);
|
||
get_user_print_options (&opts);
|
||
value_print (val, gdb_stdout, &opts);
|
||
gdb_printf (("\n"));
|
||
}
|
||
|
||
/* The next "show values +" should start after what we just printed. */
|
||
num += 10;
|
||
|
||
/* Hitting just return after this command should do the same thing as
|
||
"show values +". If num_exp is null, this is unnecessary, since
|
||
"show values +" is not useful after "show values". */
|
||
if (from_tty && num_exp)
|
||
set_repeat_arguments ("+");
|
||
}
|
||
|
||
enum internalvar_kind
|
||
{
|
||
/* The internal variable is empty. */
|
||
INTERNALVAR_VOID,
|
||
|
||
/* The value of the internal variable is provided directly as
|
||
a GDB value object. */
|
||
INTERNALVAR_VALUE,
|
||
|
||
/* A fresh value is computed via a call-back routine on every
|
||
access to the internal variable. */
|
||
INTERNALVAR_MAKE_VALUE,
|
||
|
||
/* The internal variable holds a GDB internal convenience function. */
|
||
INTERNALVAR_FUNCTION,
|
||
|
||
/* The variable holds an integer value. */
|
||
INTERNALVAR_INTEGER,
|
||
|
||
/* The variable holds a GDB-provided string. */
|
||
INTERNALVAR_STRING,
|
||
};
|
||
|
||
union internalvar_data
|
||
{
|
||
/* A value object used with INTERNALVAR_VALUE. */
|
||
struct value *value;
|
||
|
||
/* The call-back routine used with INTERNALVAR_MAKE_VALUE. */
|
||
struct
|
||
{
|
||
/* The functions to call. */
|
||
const struct internalvar_funcs *functions;
|
||
|
||
/* The function's user-data. */
|
||
void *data;
|
||
} make_value;
|
||
|
||
/* The internal function used with INTERNALVAR_FUNCTION. */
|
||
struct
|
||
{
|
||
struct internal_function *function;
|
||
/* True if this is the canonical name for the function. */
|
||
int canonical;
|
||
} fn;
|
||
|
||
/* An integer value used with INTERNALVAR_INTEGER. */
|
||
struct
|
||
{
|
||
/* If type is non-NULL, it will be used as the type to generate
|
||
a value for this internal variable. If type is NULL, a default
|
||
integer type for the architecture is used. */
|
||
struct type *type;
|
||
LONGEST val;
|
||
} integer;
|
||
|
||
/* A string value used with INTERNALVAR_STRING. */
|
||
char *string;
|
||
};
|
||
|
||
/* Internal variables. These are variables within the debugger
|
||
that hold values assigned by debugger commands.
|
||
The user refers to them with a '$' prefix
|
||
that does not appear in the variable names stored internally. */
|
||
|
||
struct internalvar
|
||
{
|
||
internalvar (std::string name)
|
||
: name (std::move (name))
|
||
{}
|
||
|
||
std::string name;
|
||
|
||
/* We support various different kinds of content of an internal variable.
|
||
enum internalvar_kind specifies the kind, and union internalvar_data
|
||
provides the data associated with this particular kind. */
|
||
|
||
enum internalvar_kind kind = INTERNALVAR_VOID;
|
||
|
||
union internalvar_data u {};
|
||
};
|
||
|
||
/* Use std::map, a sorted container, to make the order of iteration (and
|
||
therefore the output of "show convenience") stable. */
|
||
|
||
static std::map<std::string, internalvar> internalvars;
|
||
|
||
/* If the variable does not already exist create it and give it the
|
||
value given. If no value is given then the default is zero. */
|
||
static void
|
||
init_if_undefined_command (const char* args, int from_tty)
|
||
{
|
||
struct internalvar *intvar = nullptr;
|
||
|
||
/* Parse the expression - this is taken from set_command(). */
|
||
expression_up expr = parse_expression (args);
|
||
|
||
/* Validate the expression.
|
||
Was the expression an assignment?
|
||
Or even an expression at all? */
|
||
if (expr->first_opcode () != BINOP_ASSIGN)
|
||
error (_("Init-if-undefined requires an assignment expression."));
|
||
|
||
/* Extract the variable from the parsed expression. */
|
||
expr::assign_operation *assign
|
||
= dynamic_cast<expr::assign_operation *> (expr->op.get ());
|
||
if (assign != nullptr)
|
||
{
|
||
expr::operation *lhs = assign->get_lhs ();
|
||
expr::internalvar_operation *ivarop
|
||
= dynamic_cast<expr::internalvar_operation *> (lhs);
|
||
if (ivarop != nullptr)
|
||
intvar = ivarop->get_internalvar ();
|
||
}
|
||
|
||
if (intvar == nullptr)
|
||
error (_("The first parameter to init-if-undefined "
|
||
"should be a GDB variable."));
|
||
|
||
/* Only evaluate the expression if the lvalue is void.
|
||
This may still fail if the expression is invalid. */
|
||
if (intvar->kind == INTERNALVAR_VOID)
|
||
expr->evaluate ();
|
||
}
|
||
|
||
|
||
/* Look up an internal variable with name NAME. NAME should not
|
||
normally include a dollar sign.
|
||
|
||
If the specified internal variable does not exist,
|
||
the return value is NULL. */
|
||
|
||
struct internalvar *
|
||
lookup_only_internalvar (const char *name)
|
||
{
|
||
auto it = internalvars.find (name);
|
||
if (it == internalvars.end ())
|
||
return nullptr;
|
||
|
||
return &it->second;
|
||
}
|
||
|
||
/* Complete NAME by comparing it to the names of internal
|
||
variables. */
|
||
|
||
void
|
||
complete_internalvar (completion_tracker &tracker, const char *name)
|
||
{
|
||
int len = strlen (name);
|
||
|
||
for (auto &pair : internalvars)
|
||
{
|
||
const internalvar &var = pair.second;
|
||
|
||
if (var.name.compare (0, len, name) == 0)
|
||
tracker.add_completion (make_unique_xstrdup (var.name.c_str ()));
|
||
}
|
||
}
|
||
|
||
/* Create an internal variable with name NAME and with a void value.
|
||
NAME should not normally include a dollar sign.
|
||
|
||
An internal variable with that name must not exist already. */
|
||
|
||
struct internalvar *
|
||
create_internalvar (const char *name)
|
||
{
|
||
auto pair = internalvars.emplace (std::make_pair (name, internalvar (name)));
|
||
gdb_assert (pair.second);
|
||
|
||
return &pair.first->second;
|
||
}
|
||
|
||
/* Create an internal variable with name NAME and register FUN as the
|
||
function that value_of_internalvar uses to create a value whenever
|
||
this variable is referenced. NAME should not normally include a
|
||
dollar sign. DATA is passed uninterpreted to FUN when it is
|
||
called. CLEANUP, if not NULL, is called when the internal variable
|
||
is destroyed. It is passed DATA as its only argument. */
|
||
|
||
struct internalvar *
|
||
create_internalvar_type_lazy (const char *name,
|
||
const struct internalvar_funcs *funcs,
|
||
void *data)
|
||
{
|
||
struct internalvar *var = create_internalvar (name);
|
||
|
||
var->kind = INTERNALVAR_MAKE_VALUE;
|
||
var->u.make_value.functions = funcs;
|
||
var->u.make_value.data = data;
|
||
return var;
|
||
}
|
||
|
||
/* See documentation in value.h. */
|
||
|
||
int
|
||
compile_internalvar_to_ax (struct internalvar *var,
|
||
struct agent_expr *expr,
|
||
struct axs_value *value)
|
||
{
|
||
if (var->kind != INTERNALVAR_MAKE_VALUE
|
||
|| var->u.make_value.functions->compile_to_ax == NULL)
|
||
return 0;
|
||
|
||
var->u.make_value.functions->compile_to_ax (var, expr, value,
|
||
var->u.make_value.data);
|
||
return 1;
|
||
}
|
||
|
||
/* Look up an internal variable with name NAME. NAME should not
|
||
normally include a dollar sign.
|
||
|
||
If the specified internal variable does not exist,
|
||
one is created, with a void value. */
|
||
|
||
struct internalvar *
|
||
lookup_internalvar (const char *name)
|
||
{
|
||
struct internalvar *var;
|
||
|
||
var = lookup_only_internalvar (name);
|
||
if (var)
|
||
return var;
|
||
|
||
return create_internalvar (name);
|
||
}
|
||
|
||
/* Return current value of internal variable VAR. For variables that
|
||
are not inherently typed, use a value type appropriate for GDBARCH. */
|
||
|
||
struct value *
|
||
value_of_internalvar (struct gdbarch *gdbarch, struct internalvar *var)
|
||
{
|
||
struct value *val;
|
||
struct trace_state_variable *tsv;
|
||
|
||
/* If there is a trace state variable of the same name, assume that
|
||
is what we really want to see. */
|
||
tsv = find_trace_state_variable (var->name.c_str ());
|
||
if (tsv)
|
||
{
|
||
tsv->value_known = target_get_trace_state_variable_value (tsv->number,
|
||
&(tsv->value));
|
||
if (tsv->value_known)
|
||
val = value_from_longest (builtin_type (gdbarch)->builtin_int64,
|
||
tsv->value);
|
||
else
|
||
val = value::allocate (builtin_type (gdbarch)->builtin_void);
|
||
return val;
|
||
}
|
||
|
||
switch (var->kind)
|
||
{
|
||
case INTERNALVAR_VOID:
|
||
val = value::allocate (builtin_type (gdbarch)->builtin_void);
|
||
break;
|
||
|
||
case INTERNALVAR_FUNCTION:
|
||
val = value::allocate (builtin_type (gdbarch)->internal_fn);
|
||
break;
|
||
|
||
case INTERNALVAR_INTEGER:
|
||
if (!var->u.integer.type)
|
||
val = value_from_longest (builtin_type (gdbarch)->builtin_int,
|
||
var->u.integer.val);
|
||
else
|
||
val = value_from_longest (var->u.integer.type, var->u.integer.val);
|
||
break;
|
||
|
||
case INTERNALVAR_STRING:
|
||
val = current_language->value_string (gdbarch,
|
||
var->u.string,
|
||
strlen (var->u.string));
|
||
break;
|
||
|
||
case INTERNALVAR_VALUE:
|
||
val = var->u.value->copy ();
|
||
if (val->lazy ())
|
||
val->fetch_lazy ();
|
||
break;
|
||
|
||
case INTERNALVAR_MAKE_VALUE:
|
||
val = (*var->u.make_value.functions->make_value) (gdbarch, var,
|
||
var->u.make_value.data);
|
||
break;
|
||
|
||
default:
|
||
internal_error (_("bad kind"));
|
||
}
|
||
|
||
/* Change the VALUE_LVAL to lval_internalvar so that future operations
|
||
on this value go back to affect the original internal variable.
|
||
|
||
Do not do this for INTERNALVAR_MAKE_VALUE variables, as those have
|
||
no underlying modifiable state in the internal variable.
|
||
|
||
Likewise, if the variable's value is a computed lvalue, we want
|
||
references to it to produce another computed lvalue, where
|
||
references and assignments actually operate through the
|
||
computed value's functions.
|
||
|
||
This means that internal variables with computed values
|
||
behave a little differently from other internal variables:
|
||
assignments to them don't just replace the previous value
|
||
altogether. At the moment, this seems like the behavior we
|
||
want. */
|
||
|
||
if (var->kind != INTERNALVAR_MAKE_VALUE
|
||
&& val->lval () != lval_computed)
|
||
{
|
||
val->set_lval (lval_internalvar);
|
||
VALUE_INTERNALVAR (val) = var;
|
||
}
|
||
|
||
return val;
|
||
}
|
||
|
||
int
|
||
get_internalvar_integer (struct internalvar *var, LONGEST *result)
|
||
{
|
||
if (var->kind == INTERNALVAR_INTEGER)
|
||
{
|
||
*result = var->u.integer.val;
|
||
return 1;
|
||
}
|
||
|
||
if (var->kind == INTERNALVAR_VALUE)
|
||
{
|
||
struct type *type = check_typedef (var->u.value->type ());
|
||
|
||
if (type->code () == TYPE_CODE_INT)
|
||
{
|
||
*result = value_as_long (var->u.value);
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
if (var->kind == INTERNALVAR_MAKE_VALUE)
|
||
{
|
||
struct gdbarch *gdbarch = get_current_arch ();
|
||
struct value *val
|
||
= (*var->u.make_value.functions->make_value) (gdbarch, var,
|
||
var->u.make_value.data);
|
||
struct type *type = check_typedef (val->type ());
|
||
|
||
if (type->code () == TYPE_CODE_INT)
|
||
{
|
||
*result = value_as_long (val);
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
get_internalvar_function (struct internalvar *var,
|
||
struct internal_function **result)
|
||
{
|
||
switch (var->kind)
|
||
{
|
||
case INTERNALVAR_FUNCTION:
|
||
*result = var->u.fn.function;
|
||
return 1;
|
||
|
||
default:
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
void
|
||
set_internalvar_component (struct internalvar *var,
|
||
LONGEST offset, LONGEST bitpos,
|
||
LONGEST bitsize, struct value *newval)
|
||
{
|
||
gdb_byte *addr;
|
||
struct gdbarch *gdbarch;
|
||
int unit_size;
|
||
|
||
switch (var->kind)
|
||
{
|
||
case INTERNALVAR_VALUE:
|
||
addr = var->u.value->contents_writeable ().data ();
|
||
gdbarch = var->u.value->arch ();
|
||
unit_size = gdbarch_addressable_memory_unit_size (gdbarch);
|
||
|
||
if (bitsize)
|
||
modify_field (var->u.value->type (), addr + offset,
|
||
value_as_long (newval), bitpos, bitsize);
|
||
else
|
||
memcpy (addr + offset * unit_size, newval->contents ().data (),
|
||
newval->type ()->length ());
|
||
break;
|
||
|
||
default:
|
||
/* We can never get a component of any other kind. */
|
||
internal_error (_("set_internalvar_component"));
|
||
}
|
||
}
|
||
|
||
void
|
||
set_internalvar (struct internalvar *var, struct value *val)
|
||
{
|
||
enum internalvar_kind new_kind;
|
||
union internalvar_data new_data = { 0 };
|
||
|
||
if (var->kind == INTERNALVAR_FUNCTION && var->u.fn.canonical)
|
||
error (_("Cannot overwrite convenience function %s"), var->name.c_str ());
|
||
|
||
/* Prepare new contents. */
|
||
switch (check_typedef (val->type ())->code ())
|
||
{
|
||
case TYPE_CODE_VOID:
|
||
new_kind = INTERNALVAR_VOID;
|
||
break;
|
||
|
||
case TYPE_CODE_INTERNAL_FUNCTION:
|
||
gdb_assert (val->lval () == lval_internalvar);
|
||
new_kind = INTERNALVAR_FUNCTION;
|
||
get_internalvar_function (VALUE_INTERNALVAR (val),
|
||
&new_data.fn.function);
|
||
/* Copies created here are never canonical. */
|
||
break;
|
||
|
||
default:
|
||
new_kind = INTERNALVAR_VALUE;
|
||
struct value *copy = val->copy ();
|
||
copy->set_modifiable (true);
|
||
|
||
/* Force the value to be fetched from the target now, to avoid problems
|
||
later when this internalvar is referenced and the target is gone or
|
||
has changed. */
|
||
if (copy->lazy ())
|
||
copy->fetch_lazy ();
|
||
|
||
/* Release the value from the value chain to prevent it from being
|
||
deleted by free_all_values. From here on this function should not
|
||
call error () until new_data is installed into the var->u to avoid
|
||
leaking memory. */
|
||
new_data.value = release_value (copy).release ();
|
||
|
||
/* Internal variables which are created from values with a dynamic
|
||
location don't need the location property of the origin anymore.
|
||
The resolved dynamic location is used prior then any other address
|
||
when accessing the value.
|
||
If we keep it, we would still refer to the origin value.
|
||
Remove the location property in case it exist. */
|
||
new_data.value->type ()->remove_dyn_prop (DYN_PROP_DATA_LOCATION);
|
||
|
||
break;
|
||
}
|
||
|
||
/* Clean up old contents. */
|
||
clear_internalvar (var);
|
||
|
||
/* Switch over. */
|
||
var->kind = new_kind;
|
||
var->u = new_data;
|
||
/* End code which must not call error(). */
|
||
}
|
||
|
||
void
|
||
set_internalvar_integer (struct internalvar *var, LONGEST l)
|
||
{
|
||
/* Clean up old contents. */
|
||
clear_internalvar (var);
|
||
|
||
var->kind = INTERNALVAR_INTEGER;
|
||
var->u.integer.type = NULL;
|
||
var->u.integer.val = l;
|
||
}
|
||
|
||
void
|
||
set_internalvar_string (struct internalvar *var, const char *string)
|
||
{
|
||
/* Clean up old contents. */
|
||
clear_internalvar (var);
|
||
|
||
var->kind = INTERNALVAR_STRING;
|
||
var->u.string = xstrdup (string);
|
||
}
|
||
|
||
static void
|
||
set_internalvar_function (struct internalvar *var, struct internal_function *f)
|
||
{
|
||
/* Clean up old contents. */
|
||
clear_internalvar (var);
|
||
|
||
var->kind = INTERNALVAR_FUNCTION;
|
||
var->u.fn.function = f;
|
||
var->u.fn.canonical = 1;
|
||
/* Variables installed here are always the canonical version. */
|
||
}
|
||
|
||
void
|
||
clear_internalvar (struct internalvar *var)
|
||
{
|
||
/* Clean up old contents. */
|
||
switch (var->kind)
|
||
{
|
||
case INTERNALVAR_VALUE:
|
||
var->u.value->decref ();
|
||
break;
|
||
|
||
case INTERNALVAR_STRING:
|
||
xfree (var->u.string);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* Reset to void kind. */
|
||
var->kind = INTERNALVAR_VOID;
|
||
}
|
||
|
||
const char *
|
||
internalvar_name (const struct internalvar *var)
|
||
{
|
||
return var->name.c_str ();
|
||
}
|
||
|
||
static struct internal_function *
|
||
create_internal_function (const char *name,
|
||
internal_function_fn_noside handler, void *cookie)
|
||
{
|
||
struct internal_function *ifn = new (struct internal_function);
|
||
|
||
ifn->name = xstrdup (name);
|
||
ifn->handler = handler;
|
||
ifn->cookie = cookie;
|
||
return ifn;
|
||
}
|
||
|
||
const char *
|
||
value_internal_function_name (struct value *val)
|
||
{
|
||
struct internal_function *ifn;
|
||
int result;
|
||
|
||
gdb_assert (val->lval () == lval_internalvar);
|
||
result = get_internalvar_function (VALUE_INTERNALVAR (val), &ifn);
|
||
gdb_assert (result);
|
||
|
||
return ifn->name;
|
||
}
|
||
|
||
struct value *
|
||
call_internal_function (struct gdbarch *gdbarch,
|
||
const struct language_defn *language,
|
||
struct value *func, int argc, struct value **argv,
|
||
enum noside noside)
|
||
{
|
||
struct internal_function *ifn;
|
||
int result;
|
||
|
||
gdb_assert (func->lval () == lval_internalvar);
|
||
result = get_internalvar_function (VALUE_INTERNALVAR (func), &ifn);
|
||
gdb_assert (result);
|
||
|
||
return ifn->handler (gdbarch, language, ifn->cookie, argc, argv, noside);
|
||
}
|
||
|
||
/* The 'function' command. This does nothing -- it is just a
|
||
placeholder to let "help function NAME" work. This is also used as
|
||
the implementation of the sub-command that is created when
|
||
registering an internal function. */
|
||
static void
|
||
function_command (const char *command, int from_tty)
|
||
{
|
||
/* Do nothing. */
|
||
}
|
||
|
||
/* Helper function that does the work for add_internal_function. */
|
||
|
||
static struct cmd_list_element *
|
||
do_add_internal_function (const char *name, const char *doc,
|
||
internal_function_fn_noside handler, void *cookie)
|
||
{
|
||
struct internal_function *ifn;
|
||
struct internalvar *var = lookup_internalvar (name);
|
||
|
||
ifn = create_internal_function (name, handler, cookie);
|
||
set_internalvar_function (var, ifn);
|
||
|
||
return add_cmd (name, no_class, function_command, doc, &functionlist);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
add_internal_function (const char *name, const char *doc,
|
||
internal_function_fn_noside handler, void *cookie)
|
||
{
|
||
do_add_internal_function (name, doc, handler, cookie);
|
||
}
|
||
|
||
/* By default, internal functions are assumed to return int. Return a value
|
||
with that type to reflect this. If this is not correct for a specific
|
||
internal function, it should use an internal_function_fn_noside handler to
|
||
bypass this default. */
|
||
|
||
static struct value *
|
||
internal_function_default_return_type (struct gdbarch *gdbarch)
|
||
{
|
||
return value::zero (builtin_type (gdbarch)->builtin_int, not_lval);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
add_internal_function (const char *name, const char *doc,
|
||
internal_function_fn handler, void *cookie)
|
||
{
|
||
internal_function_fn_noside fn
|
||
= [=] (struct gdbarch *gdbarch,
|
||
const struct language_defn *language,
|
||
void *_cookie,
|
||
int argc,
|
||
struct value **argv,
|
||
enum noside noside)
|
||
{
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
return internal_function_default_return_type (gdbarch);
|
||
return handler (gdbarch, language, _cookie, argc, argv);
|
||
};
|
||
|
||
do_add_internal_function (name, doc, fn, cookie);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
add_internal_function (gdb::unique_xmalloc_ptr<char> &&name,
|
||
gdb::unique_xmalloc_ptr<char> &&doc,
|
||
internal_function_fn_noside handler, void *cookie)
|
||
{
|
||
struct cmd_list_element *cmd
|
||
= do_add_internal_function (name.get (), doc.get (), handler, cookie);
|
||
|
||
/* Manually transfer the ownership of the doc and name strings to CMD by
|
||
setting the appropriate flags. */
|
||
(void) doc.release ();
|
||
cmd->doc_allocated = 1;
|
||
(void) name.release ();
|
||
cmd->name_allocated = 1;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
add_internal_function (gdb::unique_xmalloc_ptr<char> &&name,
|
||
gdb::unique_xmalloc_ptr<char> &&doc,
|
||
internal_function_fn handler, void *cookie)
|
||
{
|
||
internal_function_fn_noside fn
|
||
= [=] (struct gdbarch *gdbarch,
|
||
const struct language_defn *language,
|
||
void *_cookie,
|
||
int argc,
|
||
struct value **argv,
|
||
enum noside noside)
|
||
{
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
return internal_function_default_return_type (gdbarch);
|
||
return handler (gdbarch, language, _cookie, argc, argv);
|
||
};
|
||
|
||
add_internal_function (std::forward<gdb::unique_xmalloc_ptr<char>>(name),
|
||
std::forward<gdb::unique_xmalloc_ptr<char>>(doc),
|
||
fn, cookie);
|
||
}
|
||
|
||
void
|
||
value::preserve (struct objfile *objfile, htab_t copied_types)
|
||
{
|
||
if (m_type->objfile_owner () == objfile)
|
||
m_type = copy_type_recursive (m_type, copied_types);
|
||
|
||
if (m_enclosing_type->objfile_owner () == objfile)
|
||
m_enclosing_type = copy_type_recursive (m_enclosing_type, copied_types);
|
||
}
|
||
|
||
/* Likewise for internal variable VAR. */
|
||
|
||
static void
|
||
preserve_one_internalvar (struct internalvar *var, struct objfile *objfile,
|
||
htab_t copied_types)
|
||
{
|
||
switch (var->kind)
|
||
{
|
||
case INTERNALVAR_INTEGER:
|
||
if (var->u.integer.type
|
||
&& var->u.integer.type->objfile_owner () == objfile)
|
||
var->u.integer.type
|
||
= copy_type_recursive (var->u.integer.type, copied_types);
|
||
break;
|
||
|
||
case INTERNALVAR_VALUE:
|
||
var->u.value->preserve (objfile, copied_types);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Make sure that all types and values referenced by VAROBJ are updated before
|
||
OBJFILE is discarded. COPIED_TYPES is used to prevent cycles and
|
||
duplicates. */
|
||
|
||
static void
|
||
preserve_one_varobj (struct varobj *varobj, struct objfile *objfile,
|
||
htab_t copied_types)
|
||
{
|
||
if (varobj->type->is_objfile_owned ()
|
||
&& varobj->type->objfile_owner () == objfile)
|
||
{
|
||
varobj->type
|
||
= copy_type_recursive (varobj->type, copied_types);
|
||
}
|
||
|
||
if (varobj->value != nullptr)
|
||
varobj->value->preserve (objfile, copied_types);
|
||
}
|
||
|
||
/* Update the internal variables and value history when OBJFILE is
|
||
discarded; we must copy the types out of the objfile. New global types
|
||
will be created for every convenience variable which currently points to
|
||
this objfile's types, and the convenience variables will be adjusted to
|
||
use the new global types. */
|
||
|
||
void
|
||
preserve_values (struct objfile *objfile)
|
||
{
|
||
/* Create the hash table. We allocate on the objfile's obstack, since
|
||
it is soon to be deleted. */
|
||
htab_up copied_types = create_copied_types_hash ();
|
||
|
||
for (const value_ref_ptr &item : value_history)
|
||
item->preserve (objfile, copied_types.get ());
|
||
|
||
for (auto &pair : internalvars)
|
||
preserve_one_internalvar (&pair.second, objfile, copied_types.get ());
|
||
|
||
/* For the remaining varobj, check that none has type owned by OBJFILE. */
|
||
all_root_varobjs ([&copied_types, objfile] (struct varobj *varobj)
|
||
{
|
||
preserve_one_varobj (varobj, objfile,
|
||
copied_types.get ());
|
||
});
|
||
|
||
preserve_ext_lang_values (objfile, copied_types.get ());
|
||
}
|
||
|
||
static void
|
||
show_convenience (const char *ignore, int from_tty)
|
||
{
|
||
struct gdbarch *gdbarch = get_current_arch ();
|
||
int varseen = 0;
|
||
struct value_print_options opts;
|
||
|
||
get_user_print_options (&opts);
|
||
for (auto &pair : internalvars)
|
||
{
|
||
internalvar &var = pair.second;
|
||
|
||
if (!varseen)
|
||
{
|
||
varseen = 1;
|
||
}
|
||
gdb_printf (("$%s = "), var.name.c_str ());
|
||
|
||
try
|
||
{
|
||
struct value *val;
|
||
|
||
val = value_of_internalvar (gdbarch, &var);
|
||
value_print (val, gdb_stdout, &opts);
|
||
}
|
||
catch (const gdb_exception_error &ex)
|
||
{
|
||
fprintf_styled (gdb_stdout, metadata_style.style (),
|
||
_("<error: %s>"), ex.what ());
|
||
}
|
||
|
||
gdb_printf (("\n"));
|
||
}
|
||
if (!varseen)
|
||
{
|
||
/* This text does not mention convenience functions on purpose.
|
||
The user can't create them except via Python, and if Python support
|
||
is installed this message will never be printed ($_streq will
|
||
exist). */
|
||
gdb_printf (_("No debugger convenience variables now defined.\n"
|
||
"Convenience variables have "
|
||
"names starting with \"$\";\n"
|
||
"use \"set\" as in \"set "
|
||
"$foo = 5\" to define them.\n"));
|
||
}
|
||
}
|
||
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::from_xmethod (xmethod_worker_up &&worker)
|
||
{
|
||
struct value *v;
|
||
|
||
v = value::allocate (builtin_type (current_inferior ()->arch ())->xmethod);
|
||
v->m_lval = lval_xcallable;
|
||
v->m_location.xm_worker = worker.release ();
|
||
v->m_modifiable = false;
|
||
|
||
return v;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct type *
|
||
value::result_type_of_xmethod (gdb::array_view<value *> argv)
|
||
{
|
||
gdb_assert (type ()->code () == TYPE_CODE_XMETHOD
|
||
&& m_lval == lval_xcallable && !argv.empty ());
|
||
|
||
return m_location.xm_worker->get_result_type (argv[0], argv.slice (1));
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::call_xmethod (gdb::array_view<value *> argv)
|
||
{
|
||
gdb_assert (type ()->code () == TYPE_CODE_XMETHOD
|
||
&& m_lval == lval_xcallable && !argv.empty ());
|
||
|
||
return m_location.xm_worker->invoke (argv[0], argv.slice (1));
|
||
}
|
||
|
||
/* Extract a value as a C number (either long or double).
|
||
Knows how to convert fixed values to double, or
|
||
floating values to long.
|
||
Does not deallocate the value. */
|
||
|
||
LONGEST
|
||
value_as_long (struct value *val)
|
||
{
|
||
/* This coerces arrays and functions, which is necessary (e.g.
|
||
in disassemble_command). It also dereferences references, which
|
||
I suspect is the most logical thing to do. */
|
||
val = coerce_array (val);
|
||
return unpack_long (val->type (), val->contents ().data ());
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
gdb_mpz
|
||
value_as_mpz (struct value *val)
|
||
{
|
||
val = coerce_array (val);
|
||
struct type *type = check_typedef (val->type ());
|
||
|
||
switch (type->code ())
|
||
{
|
||
case TYPE_CODE_ENUM:
|
||
case TYPE_CODE_BOOL:
|
||
case TYPE_CODE_INT:
|
||
case TYPE_CODE_CHAR:
|
||
case TYPE_CODE_RANGE:
|
||
break;
|
||
|
||
default:
|
||
return gdb_mpz (value_as_long (val));
|
||
}
|
||
|
||
gdb_mpz result;
|
||
|
||
gdb::array_view<const gdb_byte> valbytes = val->contents ();
|
||
enum bfd_endian byte_order = type_byte_order (type);
|
||
|
||
/* Handle integers that are either not a multiple of the word size,
|
||
or that are stored at some bit offset. */
|
||
unsigned bit_off = 0, bit_size = 0;
|
||
if (type->bit_size_differs_p ())
|
||
{
|
||
bit_size = type->bit_size ();
|
||
if (bit_size == 0)
|
||
{
|
||
/* We can just handle this immediately. */
|
||
return result;
|
||
}
|
||
|
||
bit_off = type->bit_offset ();
|
||
|
||
unsigned n_bytes = ((bit_off % 8) + bit_size + 7) / 8;
|
||
valbytes = valbytes.slice (bit_off / 8, n_bytes);
|
||
|
||
if (byte_order == BFD_ENDIAN_BIG)
|
||
bit_off = (n_bytes * 8 - bit_off % 8 - bit_size);
|
||
else
|
||
bit_off %= 8;
|
||
}
|
||
|
||
result.read (val->contents (), byte_order, type->is_unsigned ());
|
||
|
||
/* Shift off any low bits, if needed. */
|
||
if (bit_off != 0)
|
||
result >>= bit_off;
|
||
|
||
/* Mask off any high bits, if needed. */
|
||
if (bit_size)
|
||
result.mask (bit_size);
|
||
|
||
/* Now handle any range bias. */
|
||
if (type->code () == TYPE_CODE_RANGE && type->bounds ()->bias != 0)
|
||
{
|
||
/* Unfortunately we have to box here, because LONGEST is
|
||
probably wider than long. */
|
||
result += gdb_mpz (type->bounds ()->bias);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Extract a value as a C pointer. */
|
||
|
||
CORE_ADDR
|
||
value_as_address (struct value *val)
|
||
{
|
||
struct gdbarch *gdbarch = val->type ()->arch ();
|
||
|
||
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
|
||
whether we want this to be true eventually. */
|
||
#if 0
|
||
/* gdbarch_addr_bits_remove is wrong if we are being called for a
|
||
non-address (e.g. argument to "signal", "info break", etc.), or
|
||
for pointers to char, in which the low bits *are* significant. */
|
||
return gdbarch_addr_bits_remove (gdbarch, value_as_long (val));
|
||
#else
|
||
|
||
/* There are several targets (IA-64, PowerPC, and others) which
|
||
don't represent pointers to functions as simply the address of
|
||
the function's entry point. For example, on the IA-64, a
|
||
function pointer points to a two-word descriptor, generated by
|
||
the linker, which contains the function's entry point, and the
|
||
value the IA-64 "global pointer" register should have --- to
|
||
support position-independent code. The linker generates
|
||
descriptors only for those functions whose addresses are taken.
|
||
|
||
On such targets, it's difficult for GDB to convert an arbitrary
|
||
function address into a function pointer; it has to either find
|
||
an existing descriptor for that function, or call malloc and
|
||
build its own. On some targets, it is impossible for GDB to
|
||
build a descriptor at all: the descriptor must contain a jump
|
||
instruction; data memory cannot be executed; and code memory
|
||
cannot be modified.
|
||
|
||
Upon entry to this function, if VAL is a value of type `function'
|
||
(that is, TYPE_CODE (val->type ()) == TYPE_CODE_FUNC), then
|
||
val->address () is the address of the function. This is what
|
||
you'll get if you evaluate an expression like `main'. The call
|
||
to COERCE_ARRAY below actually does all the usual unary
|
||
conversions, which includes converting values of type `function'
|
||
to `pointer to function'. This is the challenging conversion
|
||
discussed above. Then, `unpack_pointer' will convert that pointer
|
||
back into an address.
|
||
|
||
So, suppose the user types `disassemble foo' on an architecture
|
||
with a strange function pointer representation, on which GDB
|
||
cannot build its own descriptors, and suppose further that `foo'
|
||
has no linker-built descriptor. The address->pointer conversion
|
||
will signal an error and prevent the command from running, even
|
||
though the next step would have been to convert the pointer
|
||
directly back into the same address.
|
||
|
||
The following shortcut avoids this whole mess. If VAL is a
|
||
function, just return its address directly. */
|
||
if (val->type ()->code () == TYPE_CODE_FUNC
|
||
|| val->type ()->code () == TYPE_CODE_METHOD)
|
||
return val->address ();
|
||
|
||
val = coerce_array (val);
|
||
|
||
/* Some architectures (e.g. Harvard), map instruction and data
|
||
addresses onto a single large unified address space. For
|
||
instance: An architecture may consider a large integer in the
|
||
range 0x10000000 .. 0x1000ffff to already represent a data
|
||
addresses (hence not need a pointer to address conversion) while
|
||
a small integer would still need to be converted integer to
|
||
pointer to address. Just assume such architectures handle all
|
||
integer conversions in a single function. */
|
||
|
||
/* JimB writes:
|
||
|
||
I think INTEGER_TO_ADDRESS is a good idea as proposed --- but we
|
||
must admonish GDB hackers to make sure its behavior matches the
|
||
compiler's, whenever possible.
|
||
|
||
In general, I think GDB should evaluate expressions the same way
|
||
the compiler does. When the user copies an expression out of
|
||
their source code and hands it to a `print' command, they should
|
||
get the same value the compiler would have computed. Any
|
||
deviation from this rule can cause major confusion and annoyance,
|
||
and needs to be justified carefully. In other words, GDB doesn't
|
||
really have the freedom to do these conversions in clever and
|
||
useful ways.
|
||
|
||
AndrewC pointed out that users aren't complaining about how GDB
|
||
casts integers to pointers; they are complaining that they can't
|
||
take an address from a disassembly listing and give it to `x/i'.
|
||
This is certainly important.
|
||
|
||
Adding an architecture method like integer_to_address() certainly
|
||
makes it possible for GDB to "get it right" in all circumstances
|
||
--- the target has complete control over how things get done, so
|
||
people can Do The Right Thing for their target without breaking
|
||
anyone else. The standard doesn't specify how integers get
|
||
converted to pointers; usually, the ABI doesn't either, but
|
||
ABI-specific code is a more reasonable place to handle it. */
|
||
|
||
if (!val->type ()->is_pointer_or_reference ()
|
||
&& gdbarch_integer_to_address_p (gdbarch))
|
||
return gdbarch_integer_to_address (gdbarch, val->type (),
|
||
val->contents ().data ());
|
||
|
||
return unpack_pointer (val->type (), val->contents ().data ());
|
||
#endif
|
||
}
|
||
|
||
/* Unpack raw data (copied from debugee, target byte order) at VALADDR
|
||
as a long, or as a double, assuming the raw data is described
|
||
by type TYPE. Knows how to convert different sizes of values
|
||
and can convert between fixed and floating point. We don't assume
|
||
any alignment for the raw data. Return value is in host byte order.
|
||
|
||
If you want functions and arrays to be coerced to pointers, and
|
||
references to be dereferenced, call value_as_long() instead.
|
||
|
||
C++: It is assumed that the front-end has taken care of
|
||
all matters concerning pointers to members. A pointer
|
||
to member which reaches here is considered to be equivalent
|
||
to an INT (or some size). After all, it is only an offset. */
|
||
|
||
LONGEST
|
||
unpack_long (struct type *type, const gdb_byte *valaddr)
|
||
{
|
||
if (is_fixed_point_type (type))
|
||
type = type->fixed_point_type_base_type ();
|
||
|
||
enum bfd_endian byte_order = type_byte_order (type);
|
||
enum type_code code = type->code ();
|
||
int len = type->length ();
|
||
int nosign = type->is_unsigned ();
|
||
|
||
switch (code)
|
||
{
|
||
case TYPE_CODE_TYPEDEF:
|
||
return unpack_long (check_typedef (type), valaddr);
|
||
case TYPE_CODE_ENUM:
|
||
case TYPE_CODE_FLAGS:
|
||
case TYPE_CODE_BOOL:
|
||
case TYPE_CODE_INT:
|
||
case TYPE_CODE_CHAR:
|
||
case TYPE_CODE_RANGE:
|
||
case TYPE_CODE_MEMBERPTR:
|
||
{
|
||
LONGEST result;
|
||
|
||
if (type->bit_size_differs_p ())
|
||
{
|
||
unsigned bit_off = type->bit_offset ();
|
||
unsigned bit_size = type->bit_size ();
|
||
if (bit_size == 0)
|
||
{
|
||
/* unpack_bits_as_long doesn't handle this case the
|
||
way we'd like, so handle it here. */
|
||
result = 0;
|
||
}
|
||
else
|
||
result = unpack_bits_as_long (type, valaddr, bit_off, bit_size);
|
||
}
|
||
else
|
||
{
|
||
if (nosign)
|
||
result = extract_unsigned_integer (valaddr, len, byte_order);
|
||
else
|
||
result = extract_signed_integer (valaddr, len, byte_order);
|
||
}
|
||
if (code == TYPE_CODE_RANGE)
|
||
result += type->bounds ()->bias;
|
||
return result;
|
||
}
|
||
|
||
case TYPE_CODE_FLT:
|
||
case TYPE_CODE_DECFLOAT:
|
||
return target_float_to_longest (valaddr, type);
|
||
|
||
case TYPE_CODE_FIXED_POINT:
|
||
{
|
||
gdb_mpq vq;
|
||
vq.read_fixed_point (gdb::make_array_view (valaddr, len),
|
||
byte_order, nosign,
|
||
type->fixed_point_scaling_factor ());
|
||
|
||
gdb_mpz vz = vq.as_integer ();
|
||
return vz.as_integer<LONGEST> ();
|
||
}
|
||
|
||
case TYPE_CODE_PTR:
|
||
case TYPE_CODE_REF:
|
||
case TYPE_CODE_RVALUE_REF:
|
||
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
|
||
whether we want this to be true eventually. */
|
||
return extract_typed_address (valaddr, type);
|
||
|
||
default:
|
||
error (_("Value can't be converted to integer."));
|
||
}
|
||
}
|
||
|
||
/* Unpack raw data (copied from debugee, target byte order) at VALADDR
|
||
as a CORE_ADDR, assuming the raw data is described by type TYPE.
|
||
We don't assume any alignment for the raw data. Return value is in
|
||
host byte order.
|
||
|
||
If you want functions and arrays to be coerced to pointers, and
|
||
references to be dereferenced, call value_as_address() instead.
|
||
|
||
C++: It is assumed that the front-end has taken care of
|
||
all matters concerning pointers to members. A pointer
|
||
to member which reaches here is considered to be equivalent
|
||
to an INT (or some size). After all, it is only an offset. */
|
||
|
||
CORE_ADDR
|
||
unpack_pointer (struct type *type, const gdb_byte *valaddr)
|
||
{
|
||
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
|
||
whether we want this to be true eventually. */
|
||
return unpack_long (type, valaddr);
|
||
}
|
||
|
||
bool
|
||
is_floating_value (struct value *val)
|
||
{
|
||
struct type *type = check_typedef (val->type ());
|
||
|
||
if (is_floating_type (type))
|
||
{
|
||
if (!target_float_is_valid (val->contents ().data (), type))
|
||
error (_("Invalid floating value found in program."));
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
|
||
/* Get the value of the FIELDNO'th field (which must be static) of
|
||
TYPE. */
|
||
|
||
struct value *
|
||
value_static_field (struct type *type, int fieldno)
|
||
{
|
||
struct value *retval;
|
||
|
||
switch (type->field (fieldno).loc_kind ())
|
||
{
|
||
case FIELD_LOC_KIND_PHYSADDR:
|
||
retval = value_at_lazy (type->field (fieldno).type (),
|
||
type->field (fieldno).loc_physaddr ());
|
||
break;
|
||
case FIELD_LOC_KIND_PHYSNAME:
|
||
{
|
||
const char *phys_name = type->field (fieldno).loc_physname ();
|
||
/* type->field (fieldno).name (); */
|
||
struct block_symbol sym = lookup_symbol (phys_name, nullptr,
|
||
SEARCH_VAR_DOMAIN, nullptr);
|
||
|
||
if (sym.symbol == NULL)
|
||
{
|
||
/* With some compilers, e.g. HP aCC, static data members are
|
||
reported as non-debuggable symbols. */
|
||
struct bound_minimal_symbol msym
|
||
= lookup_minimal_symbol (phys_name, NULL, NULL);
|
||
struct type *field_type = type->field (fieldno).type ();
|
||
|
||
if (!msym.minsym)
|
||
retval = value::allocate_optimized_out (field_type);
|
||
else
|
||
retval = value_at_lazy (field_type, msym.value_address ());
|
||
}
|
||
else
|
||
retval = value_of_variable (sym.symbol, sym.block);
|
||
break;
|
||
}
|
||
default:
|
||
gdb_assert_not_reached ("unexpected field location kind");
|
||
}
|
||
|
||
return retval;
|
||
}
|
||
|
||
/* Change the enclosing type of a value object VAL to NEW_ENCL_TYPE.
|
||
You have to be careful here, since the size of the data area for the value
|
||
is set by the length of the enclosing type. So if NEW_ENCL_TYPE is bigger
|
||
than the old enclosing type, you have to allocate more space for the
|
||
data. */
|
||
|
||
void
|
||
value::set_enclosing_type (struct type *new_encl_type)
|
||
{
|
||
if (new_encl_type->length () > enclosing_type ()->length ())
|
||
{
|
||
check_type_length_before_alloc (new_encl_type);
|
||
m_contents.reset ((gdb_byte *) xrealloc (m_contents.release (),
|
||
new_encl_type->length ()));
|
||
}
|
||
|
||
m_enclosing_type = new_encl_type;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::primitive_field (LONGEST offset, int fieldno, struct type *arg_type)
|
||
{
|
||
struct value *v;
|
||
struct type *type;
|
||
int unit_size = gdbarch_addressable_memory_unit_size (arch ());
|
||
|
||
arg_type = check_typedef (arg_type);
|
||
type = arg_type->field (fieldno).type ();
|
||
|
||
/* Call check_typedef on our type to make sure that, if TYPE
|
||
is a TYPE_CODE_TYPEDEF, its length is set to the length
|
||
of the target type instead of zero. However, we do not
|
||
replace the typedef type by the target type, because we want
|
||
to keep the typedef in order to be able to print the type
|
||
description correctly. */
|
||
check_typedef (type);
|
||
|
||
if (arg_type->field (fieldno).bitsize ())
|
||
{
|
||
/* Handle packed fields.
|
||
|
||
Create a new value for the bitfield, with bitpos and bitsize
|
||
set. If possible, arrange offset and bitpos so that we can
|
||
do a single aligned read of the size of the containing type.
|
||
Otherwise, adjust offset to the byte containing the first
|
||
bit. Assume that the address, offset, and embedded offset
|
||
are sufficiently aligned. */
|
||
|
||
LONGEST bitpos = arg_type->field (fieldno).loc_bitpos ();
|
||
LONGEST container_bitsize = type->length () * 8;
|
||
|
||
v = value::allocate_lazy (type);
|
||
v->set_bitsize (arg_type->field (fieldno).bitsize ());
|
||
if ((bitpos % container_bitsize) + v->bitsize () <= container_bitsize
|
||
&& type->length () <= (int) sizeof (LONGEST))
|
||
v->set_bitpos (bitpos % container_bitsize);
|
||
else
|
||
v->set_bitpos (bitpos % 8);
|
||
v->set_offset ((embedded_offset ()
|
||
+ offset
|
||
+ (bitpos - v->bitpos ()) / 8));
|
||
v->set_parent (this);
|
||
if (!lazy ())
|
||
v->fetch_lazy ();
|
||
}
|
||
else if (fieldno < TYPE_N_BASECLASSES (arg_type))
|
||
{
|
||
/* This field is actually a base subobject, so preserve the
|
||
entire object's contents for later references to virtual
|
||
bases, etc. */
|
||
LONGEST boffset;
|
||
|
||
/* Lazy register values with offsets are not supported. */
|
||
if (this->lval () == lval_register && lazy ())
|
||
fetch_lazy ();
|
||
|
||
/* We special case virtual inheritance here because this
|
||
requires access to the contents, which we would rather avoid
|
||
for references to ordinary fields of unavailable values. */
|
||
if (BASETYPE_VIA_VIRTUAL (arg_type, fieldno))
|
||
boffset = baseclass_offset (arg_type, fieldno,
|
||
contents ().data (),
|
||
embedded_offset (),
|
||
address (),
|
||
this);
|
||
else
|
||
boffset = arg_type->field (fieldno).loc_bitpos () / 8;
|
||
|
||
if (lazy ())
|
||
v = value::allocate_lazy (enclosing_type ());
|
||
else
|
||
{
|
||
v = value::allocate (enclosing_type ());
|
||
contents_copy_raw (v, 0, 0, enclosing_type ()->length ());
|
||
}
|
||
v->deprecated_set_type (type);
|
||
v->set_offset (this->offset ());
|
||
v->set_embedded_offset (offset + embedded_offset () + boffset);
|
||
}
|
||
else if (NULL != TYPE_DATA_LOCATION (type))
|
||
{
|
||
/* Field is a dynamic data member. */
|
||
|
||
gdb_assert (0 == offset);
|
||
/* We expect an already resolved data location. */
|
||
gdb_assert (TYPE_DATA_LOCATION (type)->is_constant ());
|
||
/* For dynamic data types defer memory allocation
|
||
until we actual access the value. */
|
||
v = value::allocate_lazy (type);
|
||
}
|
||
else
|
||
{
|
||
/* Plain old data member */
|
||
offset += (arg_type->field (fieldno).loc_bitpos ()
|
||
/ (HOST_CHAR_BIT * unit_size));
|
||
|
||
/* Lazy register values with offsets are not supported. */
|
||
if (this->lval () == lval_register && lazy ())
|
||
fetch_lazy ();
|
||
|
||
if (lazy ())
|
||
v = value::allocate_lazy (type);
|
||
else
|
||
{
|
||
v = value::allocate (type);
|
||
contents_copy_raw (v, v->embedded_offset (),
|
||
embedded_offset () + offset,
|
||
type_length_units (type));
|
||
}
|
||
v->set_offset (this->offset () + offset + embedded_offset ());
|
||
}
|
||
v->set_component_location (this);
|
||
return v;
|
||
}
|
||
|
||
/* Given a value ARG1 of a struct or union type,
|
||
extract and return the value of one of its (non-static) fields.
|
||
FIELDNO says which field. */
|
||
|
||
struct value *
|
||
value_field (struct value *arg1, int fieldno)
|
||
{
|
||
return arg1->primitive_field (0, fieldno, arg1->type ());
|
||
}
|
||
|
||
/* Return a non-virtual function as a value.
|
||
F is the list of member functions which contains the desired method.
|
||
J is an index into F which provides the desired method.
|
||
|
||
We only use the symbol for its address, so be happy with either a
|
||
full symbol or a minimal symbol. */
|
||
|
||
struct value *
|
||
value_fn_field (struct value **arg1p, struct fn_field *f,
|
||
int j, struct type *type,
|
||
LONGEST offset)
|
||
{
|
||
struct value *v;
|
||
struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);
|
||
const char *physname = TYPE_FN_FIELD_PHYSNAME (f, j);
|
||
struct symbol *sym;
|
||
struct bound_minimal_symbol msym;
|
||
|
||
sym = lookup_symbol (physname, nullptr, SEARCH_FUNCTION_DOMAIN,
|
||
nullptr).symbol;
|
||
if (sym == nullptr)
|
||
{
|
||
msym = lookup_bound_minimal_symbol (physname);
|
||
if (msym.minsym == NULL)
|
||
return NULL;
|
||
}
|
||
|
||
v = value::allocate (ftype);
|
||
v->set_lval (lval_memory);
|
||
if (sym)
|
||
{
|
||
v->set_address (sym->value_block ()->entry_pc ());
|
||
}
|
||
else
|
||
{
|
||
/* The minimal symbol might point to a function descriptor;
|
||
resolve it to the actual code address instead. */
|
||
struct objfile *objfile = msym.objfile;
|
||
struct gdbarch *gdbarch = objfile->arch ();
|
||
|
||
v->set_address (gdbarch_convert_from_func_ptr_addr
|
||
(gdbarch, msym.value_address (),
|
||
current_inferior ()->top_target ()));
|
||
}
|
||
|
||
if (arg1p)
|
||
{
|
||
if (type != (*arg1p)->type ())
|
||
*arg1p = value_ind (value_cast (lookup_pointer_type (type),
|
||
value_addr (*arg1p)));
|
||
|
||
/* Move the `this' pointer according to the offset.
|
||
(*arg1p)->offset () += offset; */
|
||
}
|
||
|
||
return v;
|
||
}
|
||
|
||
|
||
|
||
/* See value.h. */
|
||
|
||
LONGEST
|
||
unpack_bits_as_long (struct type *field_type, const gdb_byte *valaddr,
|
||
LONGEST bitpos, LONGEST bitsize)
|
||
{
|
||
enum bfd_endian byte_order = type_byte_order (field_type);
|
||
ULONGEST val;
|
||
ULONGEST valmask;
|
||
int lsbcount;
|
||
LONGEST bytes_read;
|
||
LONGEST read_offset;
|
||
|
||
/* Read the minimum number of bytes required; there may not be
|
||
enough bytes to read an entire ULONGEST. */
|
||
field_type = check_typedef (field_type);
|
||
if (bitsize)
|
||
bytes_read = ((bitpos % 8) + bitsize + 7) / 8;
|
||
else
|
||
{
|
||
bytes_read = field_type->length ();
|
||
bitsize = 8 * bytes_read;
|
||
}
|
||
|
||
read_offset = bitpos / 8;
|
||
|
||
val = extract_unsigned_integer (valaddr + read_offset,
|
||
bytes_read, byte_order);
|
||
|
||
/* Extract bits. See comment above. */
|
||
|
||
if (byte_order == BFD_ENDIAN_BIG)
|
||
lsbcount = (bytes_read * 8 - bitpos % 8 - bitsize);
|
||
else
|
||
lsbcount = (bitpos % 8);
|
||
val >>= lsbcount;
|
||
|
||
/* If the field does not entirely fill a LONGEST, then zero the sign bits.
|
||
If the field is signed, and is negative, then sign extend. */
|
||
|
||
if (bitsize < 8 * (int) sizeof (val))
|
||
{
|
||
valmask = (((ULONGEST) 1) << bitsize) - 1;
|
||
val &= valmask;
|
||
if (!field_type->is_unsigned ())
|
||
{
|
||
if (val & (valmask ^ (valmask >> 1)))
|
||
{
|
||
val |= ~valmask;
|
||
}
|
||
}
|
||
}
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Unpack a field FIELDNO of the specified TYPE, from the object at
|
||
VALADDR + EMBEDDED_OFFSET. VALADDR points to the contents of
|
||
ORIGINAL_VALUE, which must not be NULL. See
|
||
unpack_value_bits_as_long for more details. */
|
||
|
||
int
|
||
unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr,
|
||
LONGEST embedded_offset, int fieldno,
|
||
const struct value *val, LONGEST *result)
|
||
{
|
||
int bitpos = type->field (fieldno).loc_bitpos ();
|
||
int bitsize = type->field (fieldno).bitsize ();
|
||
struct type *field_type = type->field (fieldno).type ();
|
||
int bit_offset;
|
||
|
||
gdb_assert (val != NULL);
|
||
|
||
bit_offset = embedded_offset * TARGET_CHAR_BIT + bitpos;
|
||
if (val->bits_any_optimized_out (bit_offset, bitsize)
|
||
|| !val->bits_available (bit_offset, bitsize))
|
||
return 0;
|
||
|
||
*result = unpack_bits_as_long (field_type, valaddr + embedded_offset,
|
||
bitpos, bitsize);
|
||
return 1;
|
||
}
|
||
|
||
/* Unpack a field FIELDNO of the specified TYPE, from the anonymous
|
||
object at VALADDR. See unpack_bits_as_long for more details. */
|
||
|
||
LONGEST
|
||
unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno)
|
||
{
|
||
int bitpos = type->field (fieldno).loc_bitpos ();
|
||
int bitsize = type->field (fieldno).bitsize ();
|
||
struct type *field_type = type->field (fieldno).type ();
|
||
|
||
return unpack_bits_as_long (field_type, valaddr, bitpos, bitsize);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::unpack_bitfield (struct value *dest_val,
|
||
LONGEST bitpos, LONGEST bitsize,
|
||
const gdb_byte *valaddr, LONGEST embedded_offset)
|
||
const
|
||
{
|
||
enum bfd_endian byte_order;
|
||
int src_bit_offset;
|
||
int dst_bit_offset;
|
||
struct type *field_type = dest_val->type ();
|
||
|
||
byte_order = type_byte_order (field_type);
|
||
|
||
/* First, unpack and sign extend the bitfield as if it was wholly
|
||
valid. Optimized out/unavailable bits are read as zero, but
|
||
that's OK, as they'll end up marked below. If the VAL is
|
||
wholly-invalid we may have skipped allocating its contents,
|
||
though. See value::allocate_optimized_out. */
|
||
if (valaddr != NULL)
|
||
{
|
||
LONGEST num;
|
||
|
||
num = unpack_bits_as_long (field_type, valaddr + embedded_offset,
|
||
bitpos, bitsize);
|
||
store_signed_integer (dest_val->contents_raw ().data (),
|
||
field_type->length (), byte_order, num);
|
||
}
|
||
|
||
/* Now copy the optimized out / unavailability ranges to the right
|
||
bits. */
|
||
src_bit_offset = embedded_offset * TARGET_CHAR_BIT + bitpos;
|
||
if (byte_order == BFD_ENDIAN_BIG)
|
||
dst_bit_offset = field_type->length () * TARGET_CHAR_BIT - bitsize;
|
||
else
|
||
dst_bit_offset = 0;
|
||
ranges_copy_adjusted (dest_val, dst_bit_offset, src_bit_offset, bitsize);
|
||
}
|
||
|
||
/* Return a new value with type TYPE, which is FIELDNO field of the
|
||
object at VALADDR + EMBEDDEDOFFSET. VALADDR points to the contents
|
||
of VAL. If the VAL's contents required to extract the bitfield
|
||
from are unavailable/optimized out, the new value is
|
||
correspondingly marked unavailable/optimized out. */
|
||
|
||
struct value *
|
||
value_field_bitfield (struct type *type, int fieldno,
|
||
const gdb_byte *valaddr,
|
||
LONGEST embedded_offset, const struct value *val)
|
||
{
|
||
int bitpos = type->field (fieldno).loc_bitpos ();
|
||
int bitsize = type->field (fieldno).bitsize ();
|
||
struct value *res_val = value::allocate (type->field (fieldno).type ());
|
||
|
||
val->unpack_bitfield (res_val, bitpos, bitsize, valaddr, embedded_offset);
|
||
|
||
return res_val;
|
||
}
|
||
|
||
/* Modify the value of a bitfield. ADDR points to a block of memory in
|
||
target byte order; the bitfield starts in the byte pointed to. FIELDVAL
|
||
is the desired value of the field, in host byte order. BITPOS and BITSIZE
|
||
indicate which bits (in target bit order) comprise the bitfield.
|
||
Requires 0 < BITSIZE <= lbits, 0 <= BITPOS % 8 + BITSIZE <= lbits, and
|
||
0 <= BITPOS, where lbits is the size of a LONGEST in bits. */
|
||
|
||
void
|
||
modify_field (struct type *type, gdb_byte *addr,
|
||
LONGEST fieldval, LONGEST bitpos, LONGEST bitsize)
|
||
{
|
||
enum bfd_endian byte_order = type_byte_order (type);
|
||
ULONGEST oword;
|
||
ULONGEST mask = (ULONGEST) -1 >> (8 * sizeof (ULONGEST) - bitsize);
|
||
LONGEST bytesize;
|
||
|
||
/* Normalize BITPOS. */
|
||
addr += bitpos / 8;
|
||
bitpos %= 8;
|
||
|
||
/* If a negative fieldval fits in the field in question, chop
|
||
off the sign extension bits. */
|
||
if ((~fieldval & ~(mask >> 1)) == 0)
|
||
fieldval &= mask;
|
||
|
||
/* Warn if value is too big to fit in the field in question. */
|
||
if (0 != (fieldval & ~mask))
|
||
{
|
||
/* FIXME: would like to include fieldval in the message, but
|
||
we don't have a sprintf_longest. */
|
||
warning (_("Value does not fit in %s bits."), plongest (bitsize));
|
||
|
||
/* Truncate it, otherwise adjoining fields may be corrupted. */
|
||
fieldval &= mask;
|
||
}
|
||
|
||
/* Ensure no bytes outside of the modified ones get accessed as it may cause
|
||
false valgrind reports. */
|
||
|
||
bytesize = (bitpos + bitsize + 7) / 8;
|
||
oword = extract_unsigned_integer (addr, bytesize, byte_order);
|
||
|
||
/* Shifting for bit field depends on endianness of the target machine. */
|
||
if (byte_order == BFD_ENDIAN_BIG)
|
||
bitpos = bytesize * 8 - bitpos - bitsize;
|
||
|
||
oword &= ~(mask << bitpos);
|
||
oword |= fieldval << bitpos;
|
||
|
||
store_unsigned_integer (addr, bytesize, byte_order, oword);
|
||
}
|
||
|
||
/* Pack NUM into BUF using a target format of TYPE. */
|
||
|
||
void
|
||
pack_long (gdb_byte *buf, struct type *type, LONGEST num)
|
||
{
|
||
enum bfd_endian byte_order = type_byte_order (type);
|
||
LONGEST len;
|
||
|
||
type = check_typedef (type);
|
||
len = type->length ();
|
||
|
||
switch (type->code ())
|
||
{
|
||
case TYPE_CODE_RANGE:
|
||
num -= type->bounds ()->bias;
|
||
[[fallthrough]];
|
||
case TYPE_CODE_INT:
|
||
case TYPE_CODE_CHAR:
|
||
case TYPE_CODE_ENUM:
|
||
case TYPE_CODE_FLAGS:
|
||
case TYPE_CODE_BOOL:
|
||
case TYPE_CODE_MEMBERPTR:
|
||
if (type->bit_size_differs_p ())
|
||
{
|
||
unsigned bit_off = type->bit_offset ();
|
||
unsigned bit_size = type->bit_size ();
|
||
num &= ((ULONGEST) 1 << bit_size) - 1;
|
||
num <<= bit_off;
|
||
}
|
||
store_signed_integer (buf, len, byte_order, num);
|
||
break;
|
||
|
||
case TYPE_CODE_REF:
|
||
case TYPE_CODE_RVALUE_REF:
|
||
case TYPE_CODE_PTR:
|
||
store_typed_address (buf, type, (CORE_ADDR) num);
|
||
break;
|
||
|
||
case TYPE_CODE_FLT:
|
||
case TYPE_CODE_DECFLOAT:
|
||
target_float_from_longest (buf, type, num);
|
||
break;
|
||
|
||
default:
|
||
error (_("Unexpected type (%d) encountered for integer constant."),
|
||
type->code ());
|
||
}
|
||
}
|
||
|
||
|
||
/* Pack NUM into BUF using a target format of TYPE. */
|
||
|
||
static void
|
||
pack_unsigned_long (gdb_byte *buf, struct type *type, ULONGEST num)
|
||
{
|
||
LONGEST len;
|
||
enum bfd_endian byte_order;
|
||
|
||
type = check_typedef (type);
|
||
len = type->length ();
|
||
byte_order = type_byte_order (type);
|
||
|
||
switch (type->code ())
|
||
{
|
||
case TYPE_CODE_INT:
|
||
case TYPE_CODE_CHAR:
|
||
case TYPE_CODE_ENUM:
|
||
case TYPE_CODE_FLAGS:
|
||
case TYPE_CODE_BOOL:
|
||
case TYPE_CODE_RANGE:
|
||
case TYPE_CODE_MEMBERPTR:
|
||
if (type->bit_size_differs_p ())
|
||
{
|
||
unsigned bit_off = type->bit_offset ();
|
||
unsigned bit_size = type->bit_size ();
|
||
num &= ((ULONGEST) 1 << bit_size) - 1;
|
||
num <<= bit_off;
|
||
}
|
||
store_unsigned_integer (buf, len, byte_order, num);
|
||
break;
|
||
|
||
case TYPE_CODE_REF:
|
||
case TYPE_CODE_RVALUE_REF:
|
||
case TYPE_CODE_PTR:
|
||
store_typed_address (buf, type, (CORE_ADDR) num);
|
||
break;
|
||
|
||
case TYPE_CODE_FLT:
|
||
case TYPE_CODE_DECFLOAT:
|
||
target_float_from_ulongest (buf, type, num);
|
||
break;
|
||
|
||
default:
|
||
error (_("Unexpected type (%d) encountered "
|
||
"for unsigned integer constant."),
|
||
type->code ());
|
||
}
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::zero (struct type *type, enum lval_type lv)
|
||
{
|
||
struct value *val = value::allocate_lazy (type);
|
||
|
||
val->set_lval (lv == lval_computed ? not_lval : lv);
|
||
val->m_is_zero = true;
|
||
return val;
|
||
}
|
||
|
||
/* Convert C numbers into newly allocated values. */
|
||
|
||
struct value *
|
||
value_from_longest (struct type *type, LONGEST num)
|
||
{
|
||
struct value *val = value::allocate (type);
|
||
|
||
pack_long (val->contents_raw ().data (), type, num);
|
||
return val;
|
||
}
|
||
|
||
|
||
/* Convert C unsigned numbers into newly allocated values. */
|
||
|
||
struct value *
|
||
value_from_ulongest (struct type *type, ULONGEST num)
|
||
{
|
||
struct value *val = value::allocate (type);
|
||
|
||
pack_unsigned_long (val->contents_raw ().data (), type, num);
|
||
|
||
return val;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value_from_mpz (struct type *type, const gdb_mpz &v)
|
||
{
|
||
struct type *real_type = check_typedef (type);
|
||
|
||
const gdb_mpz *val = &v;
|
||
gdb_mpz storage;
|
||
if (real_type->code () == TYPE_CODE_RANGE && type->bounds ()->bias != 0)
|
||
{
|
||
storage = *val;
|
||
val = &storage;
|
||
storage -= type->bounds ()->bias;
|
||
}
|
||
|
||
if (type->bit_size_differs_p ())
|
||
{
|
||
unsigned bit_off = type->bit_offset ();
|
||
unsigned bit_size = type->bit_size ();
|
||
|
||
if (val != &storage)
|
||
{
|
||
storage = *val;
|
||
val = &storage;
|
||
}
|
||
|
||
storage.mask (bit_size);
|
||
storage <<= bit_off;
|
||
}
|
||
|
||
struct value *result = value::allocate (type);
|
||
val->truncate (result->contents_raw (), type_byte_order (type),
|
||
type->is_unsigned ());
|
||
return result;
|
||
}
|
||
|
||
/* Create a value representing a pointer of type TYPE to the address
|
||
ADDR. */
|
||
|
||
struct value *
|
||
value_from_pointer (struct type *type, CORE_ADDR addr)
|
||
{
|
||
struct value *val = value::allocate (type);
|
||
|
||
store_typed_address (val->contents_raw ().data (),
|
||
check_typedef (type), addr);
|
||
return val;
|
||
}
|
||
|
||
/* Create and return a value object of TYPE containing the value D. The
|
||
TYPE must be of TYPE_CODE_FLT, and must be large enough to hold D once
|
||
it is converted to target format. */
|
||
|
||
struct value *
|
||
value_from_host_double (struct type *type, double d)
|
||
{
|
||
struct value *value = value::allocate (type);
|
||
gdb_assert (type->code () == TYPE_CODE_FLT);
|
||
target_float_from_host_double (value->contents_raw ().data (),
|
||
value->type (), d);
|
||
return value;
|
||
}
|
||
|
||
/* Create a value of type TYPE whose contents come from VALADDR, if it
|
||
is non-null, and whose memory address (in the inferior) is
|
||
ADDRESS. The type of the created value may differ from the passed
|
||
type TYPE. Make sure to retrieve values new type after this call.
|
||
Note that TYPE is not passed through resolve_dynamic_type; this is
|
||
a special API intended for use only by Ada. */
|
||
|
||
struct value *
|
||
value_from_contents_and_address_unresolved (struct type *type,
|
||
const gdb_byte *valaddr,
|
||
CORE_ADDR address)
|
||
{
|
||
struct value *v;
|
||
|
||
if (valaddr == NULL)
|
||
v = value::allocate_lazy (type);
|
||
else
|
||
v = value_from_contents (type, valaddr);
|
||
v->set_lval (lval_memory);
|
||
v->set_address (address);
|
||
return v;
|
||
}
|
||
|
||
/* Create a value of type TYPE whose contents come from VALADDR, if it
|
||
is non-null, and whose memory address (in the inferior) is
|
||
ADDRESS. The type of the created value may differ from the passed
|
||
type TYPE. Make sure to retrieve values new type after this call. */
|
||
|
||
struct value *
|
||
value_from_contents_and_address (struct type *type,
|
||
const gdb_byte *valaddr,
|
||
CORE_ADDR address,
|
||
const frame_info_ptr &frame)
|
||
{
|
||
gdb::array_view<const gdb_byte> view;
|
||
if (valaddr != nullptr)
|
||
view = gdb::make_array_view (valaddr, type->length ());
|
||
struct type *resolved_type = resolve_dynamic_type (type, view, address,
|
||
&frame);
|
||
struct type *resolved_type_no_typedef = check_typedef (resolved_type);
|
||
|
||
struct value *v;
|
||
if (resolved_type_no_typedef->code () == TYPE_CODE_ARRAY
|
||
&& resolved_type_no_typedef->bound_optimized_out ())
|
||
{
|
||
/* Resolution found that the bounds are optimized out. In this
|
||
case, mark the array itself as optimized-out. */
|
||
v = value::allocate_optimized_out (resolved_type);
|
||
}
|
||
else if (valaddr == nullptr)
|
||
v = value::allocate_lazy (resolved_type);
|
||
else
|
||
v = value_from_contents (resolved_type, valaddr);
|
||
if (TYPE_DATA_LOCATION (resolved_type_no_typedef) != NULL
|
||
&& TYPE_DATA_LOCATION (resolved_type_no_typedef)->is_constant ())
|
||
address = TYPE_DATA_LOCATION_ADDR (resolved_type_no_typedef);
|
||
v->set_lval (lval_memory);
|
||
v->set_address (address);
|
||
return v;
|
||
}
|
||
|
||
/* Create a value of type TYPE holding the contents CONTENTS.
|
||
The new value is `not_lval'. */
|
||
|
||
struct value *
|
||
value_from_contents (struct type *type, const gdb_byte *contents)
|
||
{
|
||
struct value *result;
|
||
|
||
result = value::allocate (type);
|
||
memcpy (result->contents_raw ().data (), contents, type->length ());
|
||
return result;
|
||
}
|
||
|
||
/* Extract a value from the history file. Input will be of the form
|
||
$digits or $$digits. See block comment above 'write_dollar_variable'
|
||
for details. */
|
||
|
||
struct value *
|
||
value_from_history_ref (const char *h, const char **endp)
|
||
{
|
||
int index, len;
|
||
|
||
if (h[0] == '$')
|
||
len = 1;
|
||
else
|
||
return NULL;
|
||
|
||
if (h[1] == '$')
|
||
len = 2;
|
||
|
||
/* Find length of numeral string. */
|
||
for (; isdigit (h[len]); len++)
|
||
;
|
||
|
||
/* Make sure numeral string is not part of an identifier. */
|
||
if (h[len] == '_' || isalpha (h[len]))
|
||
return NULL;
|
||
|
||
/* Now collect the index value. */
|
||
if (h[1] == '$')
|
||
{
|
||
if (len == 2)
|
||
{
|
||
/* For some bizarre reason, "$$" is equivalent to "$$1",
|
||
rather than to "$$0" as it ought to be! */
|
||
index = -1;
|
||
*endp += len;
|
||
}
|
||
else
|
||
{
|
||
char *local_end;
|
||
|
||
index = -strtol (&h[2], &local_end, 10);
|
||
*endp = local_end;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (len == 1)
|
||
{
|
||
/* "$" is equivalent to "$0". */
|
||
index = 0;
|
||
*endp += len;
|
||
}
|
||
else
|
||
{
|
||
char *local_end;
|
||
|
||
index = strtol (&h[1], &local_end, 10);
|
||
*endp = local_end;
|
||
}
|
||
}
|
||
|
||
return access_value_history (index);
|
||
}
|
||
|
||
/* Get the component value (offset by OFFSET bytes) of a struct or
|
||
union WHOLE. Component's type is TYPE. */
|
||
|
||
struct value *
|
||
value_from_component (struct value *whole, struct type *type, LONGEST offset)
|
||
{
|
||
struct value *v;
|
||
|
||
if (whole->lval () == lval_memory && whole->lazy ())
|
||
v = value::allocate_lazy (type);
|
||
else
|
||
{
|
||
v = value::allocate (type);
|
||
whole->contents_copy (v, v->embedded_offset (),
|
||
whole->embedded_offset () + offset,
|
||
type_length_units (type));
|
||
}
|
||
v->set_offset (whole->offset () + offset + whole->embedded_offset ());
|
||
v->set_component_location (whole);
|
||
|
||
return v;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
struct value *
|
||
value::from_component_bitsize (struct type *type,
|
||
LONGEST bit_offset, LONGEST bit_length)
|
||
{
|
||
gdb_assert (!lazy ());
|
||
|
||
/* Preserve lvalue-ness if possible. This is needed to avoid
|
||
array-printing failures (including crashes) when printing Ada
|
||
arrays in programs compiled with -fgnat-encodings=all. */
|
||
if ((bit_offset % TARGET_CHAR_BIT) == 0
|
||
&& (bit_length % TARGET_CHAR_BIT) == 0
|
||
&& bit_length == TARGET_CHAR_BIT * type->length ())
|
||
return value_from_component (this, type, bit_offset / TARGET_CHAR_BIT);
|
||
|
||
struct value *v = value::allocate (type);
|
||
|
||
LONGEST dst_offset = TARGET_CHAR_BIT * v->embedded_offset ();
|
||
if (is_scalar_type (type) && type_byte_order (type) == BFD_ENDIAN_BIG)
|
||
dst_offset += TARGET_CHAR_BIT * type->length () - bit_length;
|
||
|
||
contents_copy_raw_bitwise (v, dst_offset,
|
||
TARGET_CHAR_BIT
|
||
* embedded_offset ()
|
||
+ bit_offset,
|
||
bit_length);
|
||
return v;
|
||
}
|
||
|
||
struct value *
|
||
coerce_ref_if_computed (const struct value *arg)
|
||
{
|
||
const struct lval_funcs *funcs;
|
||
|
||
if (!TYPE_IS_REFERENCE (check_typedef (arg->type ())))
|
||
return NULL;
|
||
|
||
if (arg->lval () != lval_computed)
|
||
return NULL;
|
||
|
||
funcs = arg->computed_funcs ();
|
||
if (funcs->coerce_ref == NULL)
|
||
return NULL;
|
||
|
||
return funcs->coerce_ref (arg);
|
||
}
|
||
|
||
/* Look at value.h for description. */
|
||
|
||
struct value *
|
||
readjust_indirect_value_type (struct value *value, struct type *enc_type,
|
||
const struct type *original_type,
|
||
struct value *original_value,
|
||
CORE_ADDR original_value_address)
|
||
{
|
||
gdb_assert (original_type->is_pointer_or_reference ());
|
||
|
||
struct type *original_target_type = original_type->target_type ();
|
||
gdb::array_view<const gdb_byte> view;
|
||
struct type *resolved_original_target_type
|
||
= resolve_dynamic_type (original_target_type, view,
|
||
original_value_address);
|
||
|
||
/* Re-adjust type. */
|
||
value->deprecated_set_type (resolved_original_target_type);
|
||
|
||
/* Add embedding info. */
|
||
value->set_enclosing_type (enc_type);
|
||
value->set_embedded_offset (original_value->pointed_to_offset ());
|
||
|
||
/* We may be pointing to an object of some derived type. */
|
||
return value_full_object (value, NULL, 0, 0, 0);
|
||
}
|
||
|
||
struct value *
|
||
coerce_ref (struct value *arg)
|
||
{
|
||
struct type *value_type_arg_tmp = check_typedef (arg->type ());
|
||
struct value *retval;
|
||
struct type *enc_type;
|
||
|
||
retval = coerce_ref_if_computed (arg);
|
||
if (retval)
|
||
return retval;
|
||
|
||
if (!TYPE_IS_REFERENCE (value_type_arg_tmp))
|
||
return arg;
|
||
|
||
enc_type = check_typedef (arg->enclosing_type ());
|
||
enc_type = enc_type->target_type ();
|
||
|
||
CORE_ADDR addr = unpack_pointer (arg->type (), arg->contents ().data ());
|
||
retval = value_at_lazy (enc_type, addr);
|
||
enc_type = retval->type ();
|
||
return readjust_indirect_value_type (retval, enc_type, value_type_arg_tmp,
|
||
arg, addr);
|
||
}
|
||
|
||
struct value *
|
||
coerce_array (struct value *arg)
|
||
{
|
||
struct type *type;
|
||
|
||
arg = coerce_ref (arg);
|
||
type = check_typedef (arg->type ());
|
||
|
||
switch (type->code ())
|
||
{
|
||
case TYPE_CODE_ARRAY:
|
||
if (!type->is_vector () && current_language->c_style_arrays_p ())
|
||
arg = value_coerce_array (arg);
|
||
break;
|
||
case TYPE_CODE_FUNC:
|
||
arg = value_coerce_function (arg);
|
||
break;
|
||
}
|
||
return arg;
|
||
}
|
||
|
||
|
||
/* Return the return value convention that will be used for the
|
||
specified type. */
|
||
|
||
enum return_value_convention
|
||
struct_return_convention (struct gdbarch *gdbarch,
|
||
struct value *function, struct type *value_type)
|
||
{
|
||
enum type_code code = value_type->code ();
|
||
|
||
if (code == TYPE_CODE_ERROR)
|
||
error (_("Function return type unknown."));
|
||
|
||
/* Probe the architecture for the return-value convention. */
|
||
return gdbarch_return_value_as_value (gdbarch, function, value_type,
|
||
NULL, NULL, NULL);
|
||
}
|
||
|
||
/* Return true if the function returning the specified type is using
|
||
the convention of returning structures in memory (passing in the
|
||
address as a hidden first parameter). */
|
||
|
||
int
|
||
using_struct_return (struct gdbarch *gdbarch,
|
||
struct value *function, struct type *value_type)
|
||
{
|
||
if (value_type->code () == TYPE_CODE_VOID)
|
||
/* A void return value is never in memory. See also corresponding
|
||
code in "print_return_value". */
|
||
return 0;
|
||
|
||
return (struct_return_convention (gdbarch, function, value_type)
|
||
!= RETURN_VALUE_REGISTER_CONVENTION);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::fetch_lazy_bitfield ()
|
||
{
|
||
gdb_assert (bitsize () != 0);
|
||
|
||
/* To read a lazy bitfield, read the entire enclosing value. This
|
||
prevents reading the same block of (possibly volatile) memory once
|
||
per bitfield. It would be even better to read only the containing
|
||
word, but we have no way to record that just specific bits of a
|
||
value have been fetched. */
|
||
struct value *parent = this->parent ();
|
||
|
||
if (parent->lazy ())
|
||
parent->fetch_lazy ();
|
||
|
||
parent->unpack_bitfield (this, bitpos (), bitsize (),
|
||
parent->contents_for_printing ().data (),
|
||
offset ());
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::fetch_lazy_memory ()
|
||
{
|
||
gdb_assert (m_lval == lval_memory);
|
||
|
||
CORE_ADDR addr = address ();
|
||
struct type *type = check_typedef (enclosing_type ());
|
||
|
||
/* Figure out how much we should copy from memory. Usually, this is just
|
||
the size of the type, but, for arrays, we might only be loading a
|
||
small part of the array (this is only done for very large arrays). */
|
||
int len = 0;
|
||
if (m_limited_length > 0)
|
||
{
|
||
gdb_assert (this->type ()->code () == TYPE_CODE_ARRAY);
|
||
len = m_limited_length;
|
||
}
|
||
else if (type->length () > 0)
|
||
len = type_length_units (type);
|
||
|
||
gdb_assert (len >= 0);
|
||
|
||
if (len > 0)
|
||
read_value_memory (this, 0, stack (), addr,
|
||
contents_all_raw ().data (), len);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::fetch_lazy_register ()
|
||
{
|
||
struct type *type = check_typedef (this->type ());
|
||
struct value *new_val = this;
|
||
|
||
scoped_value_mark mark;
|
||
|
||
/* Offsets are not supported here; lazy register values must
|
||
refer to the entire register. */
|
||
gdb_assert (offset () == 0);
|
||
|
||
while (new_val->lval () == lval_register && new_val->lazy ())
|
||
{
|
||
frame_id next_frame_id = new_val->next_frame_id ();
|
||
frame_info_ptr next_frame = frame_find_by_id (next_frame_id);
|
||
gdb_assert (next_frame != NULL);
|
||
|
||
int regnum = new_val->regnum ();
|
||
|
||
/* Convertible register routines are used for multi-register
|
||
values and for interpretation in different types
|
||
(e.g. float or int from a double register). Lazy
|
||
register values should have the register's natural type,
|
||
so they do not apply. */
|
||
gdb_assert (!gdbarch_convert_register_p (get_frame_arch (next_frame),
|
||
regnum, type));
|
||
|
||
new_val = frame_unwind_register_value (next_frame, regnum);
|
||
|
||
/* If we get another lazy lval_register value, it means the
|
||
register is found by reading it from NEXT_FRAME's next frame.
|
||
frame_unwind_register_value should never return a value with
|
||
the frame id pointing to NEXT_FRAME. If it does, it means we
|
||
either have two consecutive frames with the same frame id
|
||
in the frame chain, or some code is trying to unwind
|
||
behind get_prev_frame's back (e.g., a frame unwind
|
||
sniffer trying to unwind), bypassing its validations. In
|
||
any case, it should always be an internal error to end up
|
||
in this situation. */
|
||
if (new_val->lval () == lval_register
|
||
&& new_val->lazy ()
|
||
&& new_val->next_frame_id () == next_frame_id)
|
||
internal_error (_("infinite loop while fetching a register"));
|
||
}
|
||
|
||
/* If it's still lazy (for instance, a saved register on the
|
||
stack), fetch it. */
|
||
if (new_val->lazy ())
|
||
new_val->fetch_lazy ();
|
||
|
||
/* Copy the contents and the unavailability/optimized-out
|
||
meta-data from NEW_VAL to VAL. */
|
||
set_lazy (false);
|
||
new_val->contents_copy (this, embedded_offset (),
|
||
new_val->embedded_offset (),
|
||
type_length_units (type));
|
||
|
||
if (frame_debug)
|
||
{
|
||
frame_info_ptr frame = frame_find_by_id (this->next_frame_id ());
|
||
frame = get_prev_frame_always (frame);
|
||
int regnum = this->regnum ();
|
||
gdbarch *gdbarch = get_frame_arch (frame);
|
||
|
||
string_file debug_file;
|
||
gdb_printf (&debug_file,
|
||
"(frame=%d, regnum=%d(%s), ...) ",
|
||
frame_relative_level (frame), regnum,
|
||
user_reg_map_regnum_to_name (gdbarch, regnum));
|
||
|
||
gdb_printf (&debug_file, "->");
|
||
if (new_val->optimized_out ())
|
||
{
|
||
gdb_printf (&debug_file, " ");
|
||
val_print_optimized_out (new_val, &debug_file);
|
||
}
|
||
else
|
||
{
|
||
if (new_val->lval () == lval_register)
|
||
gdb_printf (&debug_file, " register=%d", new_val->regnum ());
|
||
else if (new_val->lval () == lval_memory)
|
||
gdb_printf (&debug_file, " address=%s",
|
||
paddress (gdbarch,
|
||
new_val->address ()));
|
||
else
|
||
gdb_printf (&debug_file, " computed");
|
||
|
||
if (new_val->entirely_available ())
|
||
{
|
||
int i;
|
||
gdb::array_view<const gdb_byte> buf = new_val->contents ();
|
||
|
||
gdb_printf (&debug_file, " bytes=");
|
||
gdb_printf (&debug_file, "[");
|
||
for (i = 0; i < register_size (gdbarch, regnum); i++)
|
||
gdb_printf (&debug_file, "%02x", buf[i]);
|
||
gdb_printf (&debug_file, "]");
|
||
}
|
||
else if (new_val->entirely_unavailable ())
|
||
gdb_printf (&debug_file, " unavailable");
|
||
else
|
||
gdb_printf (&debug_file, " partly unavailable");
|
||
}
|
||
|
||
frame_debug_printf ("%s", debug_file.c_str ());
|
||
}
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
value::fetch_lazy ()
|
||
{
|
||
gdb_assert (lazy ());
|
||
allocate_contents (true);
|
||
/* A value is either lazy, or fully fetched. The
|
||
availability/validity is only established as we try to fetch a
|
||
value. */
|
||
gdb_assert (m_optimized_out.empty ());
|
||
gdb_assert (m_unavailable.empty ());
|
||
if (m_is_zero)
|
||
{
|
||
/* Nothing. */
|
||
}
|
||
else if (bitsize ())
|
||
fetch_lazy_bitfield ();
|
||
else if (this->lval () == lval_memory)
|
||
fetch_lazy_memory ();
|
||
else if (this->lval () == lval_register)
|
||
fetch_lazy_register ();
|
||
else if (this->lval () == lval_computed
|
||
&& computed_funcs ()->read != NULL)
|
||
computed_funcs ()->read (this);
|
||
else
|
||
internal_error (_("Unexpected lazy value type."));
|
||
|
||
set_lazy (false);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
value *
|
||
pseudo_from_raw_part (const frame_info_ptr &next_frame, int pseudo_reg_num,
|
||
int raw_reg_num, int raw_offset)
|
||
{
|
||
value *pseudo_reg_val
|
||
= value::allocate_register (next_frame, pseudo_reg_num);
|
||
value *raw_reg_val = value_of_register (raw_reg_num, next_frame);
|
||
raw_reg_val->contents_copy (pseudo_reg_val, 0, raw_offset,
|
||
pseudo_reg_val->type ()->length ());
|
||
return pseudo_reg_val;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
pseudo_to_raw_part (const frame_info_ptr &next_frame,
|
||
gdb::array_view<const gdb_byte> pseudo_buf,
|
||
int raw_reg_num, int raw_offset)
|
||
{
|
||
int raw_reg_size
|
||
= register_size (frame_unwind_arch (next_frame), raw_reg_num);
|
||
|
||
/* When overflowing a register, put_frame_register_bytes writes to the
|
||
subsequent registers. We don't want that behavior here, so make sure
|
||
the write is wholly within register RAW_REG_NUM. */
|
||
gdb_assert (raw_offset + pseudo_buf.size () <= raw_reg_size);
|
||
put_frame_register_bytes (next_frame, raw_reg_num, raw_offset, pseudo_buf);
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
value *
|
||
pseudo_from_concat_raw (const frame_info_ptr &next_frame, int pseudo_reg_num,
|
||
int raw_reg_1_num, int raw_reg_2_num)
|
||
{
|
||
value *pseudo_reg_val
|
||
= value::allocate_register (next_frame, pseudo_reg_num);
|
||
int dst_offset = 0;
|
||
|
||
value *raw_reg_1_val = value_of_register (raw_reg_1_num, next_frame);
|
||
raw_reg_1_val->contents_copy (pseudo_reg_val, dst_offset, 0,
|
||
raw_reg_1_val->type ()->length ());
|
||
dst_offset += raw_reg_1_val->type ()->length ();
|
||
|
||
value *raw_reg_2_val = value_of_register (raw_reg_2_num, next_frame);
|
||
raw_reg_2_val->contents_copy (pseudo_reg_val, dst_offset, 0,
|
||
raw_reg_2_val->type ()->length ());
|
||
dst_offset += raw_reg_2_val->type ()->length ();
|
||
|
||
gdb_assert (dst_offset == pseudo_reg_val->type ()->length ());
|
||
|
||
return pseudo_reg_val;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
pseudo_to_concat_raw (const frame_info_ptr &next_frame,
|
||
gdb::array_view<const gdb_byte> pseudo_buf,
|
||
int raw_reg_1_num, int raw_reg_2_num)
|
||
{
|
||
int src_offset = 0;
|
||
gdbarch *arch = frame_unwind_arch (next_frame);
|
||
|
||
int raw_reg_1_size = register_size (arch, raw_reg_1_num);
|
||
put_frame_register (next_frame, raw_reg_1_num,
|
||
pseudo_buf.slice (src_offset, raw_reg_1_size));
|
||
src_offset += raw_reg_1_size;
|
||
|
||
int raw_reg_2_size = register_size (arch, raw_reg_2_num);
|
||
put_frame_register (next_frame, raw_reg_2_num,
|
||
pseudo_buf.slice (src_offset, raw_reg_2_size));
|
||
src_offset += raw_reg_2_size;
|
||
|
||
gdb_assert (src_offset == pseudo_buf.size ());
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
value *
|
||
pseudo_from_concat_raw (const frame_info_ptr &next_frame, int pseudo_reg_num,
|
||
int raw_reg_1_num, int raw_reg_2_num,
|
||
int raw_reg_3_num)
|
||
{
|
||
value *pseudo_reg_val
|
||
= value::allocate_register (next_frame, pseudo_reg_num);
|
||
int dst_offset = 0;
|
||
|
||
value *raw_reg_1_val = value_of_register (raw_reg_1_num, next_frame);
|
||
raw_reg_1_val->contents_copy (pseudo_reg_val, dst_offset, 0,
|
||
raw_reg_1_val->type ()->length ());
|
||
dst_offset += raw_reg_1_val->type ()->length ();
|
||
|
||
value *raw_reg_2_val = value_of_register (raw_reg_2_num, next_frame);
|
||
raw_reg_2_val->contents_copy (pseudo_reg_val, dst_offset, 0,
|
||
raw_reg_2_val->type ()->length ());
|
||
dst_offset += raw_reg_2_val->type ()->length ();
|
||
|
||
value *raw_reg_3_val = value_of_register (raw_reg_3_num, next_frame);
|
||
raw_reg_3_val->contents_copy (pseudo_reg_val, dst_offset, 0,
|
||
raw_reg_3_val->type ()->length ());
|
||
dst_offset += raw_reg_3_val->type ()->length ();
|
||
|
||
gdb_assert (dst_offset == pseudo_reg_val->type ()->length ());
|
||
|
||
return pseudo_reg_val;
|
||
}
|
||
|
||
/* See value.h. */
|
||
|
||
void
|
||
pseudo_to_concat_raw (const frame_info_ptr &next_frame,
|
||
gdb::array_view<const gdb_byte> pseudo_buf,
|
||
int raw_reg_1_num, int raw_reg_2_num, int raw_reg_3_num)
|
||
{
|
||
int src_offset = 0;
|
||
gdbarch *arch = frame_unwind_arch (next_frame);
|
||
|
||
int raw_reg_1_size = register_size (arch, raw_reg_1_num);
|
||
put_frame_register (next_frame, raw_reg_1_num,
|
||
pseudo_buf.slice (src_offset, raw_reg_1_size));
|
||
src_offset += raw_reg_1_size;
|
||
|
||
int raw_reg_2_size = register_size (arch, raw_reg_2_num);
|
||
put_frame_register (next_frame, raw_reg_2_num,
|
||
pseudo_buf.slice (src_offset, raw_reg_2_size));
|
||
src_offset += raw_reg_2_size;
|
||
|
||
int raw_reg_3_size = register_size (arch, raw_reg_3_num);
|
||
put_frame_register (next_frame, raw_reg_3_num,
|
||
pseudo_buf.slice (src_offset, raw_reg_3_size));
|
||
src_offset += raw_reg_3_size;
|
||
|
||
gdb_assert (src_offset == pseudo_buf.size ());
|
||
}
|
||
|
||
/* Implementation of the convenience function $_isvoid. */
|
||
|
||
static struct value *
|
||
isvoid_internal_fn (struct gdbarch *gdbarch,
|
||
const struct language_defn *language,
|
||
void *cookie, int argc, struct value **argv)
|
||
{
|
||
int ret;
|
||
|
||
if (argc != 1)
|
||
error (_("You must provide one argument for $_isvoid."));
|
||
|
||
ret = argv[0]->type ()->code () == TYPE_CODE_VOID;
|
||
|
||
return value_from_longest (builtin_type (gdbarch)->builtin_int, ret);
|
||
}
|
||
|
||
/* Implementation of the convenience function $_creal. Extracts the
|
||
real part from a complex number. */
|
||
|
||
static struct value *
|
||
creal_internal_fn (struct gdbarch *gdbarch,
|
||
const struct language_defn *language,
|
||
void *cookie, int argc, struct value **argv,
|
||
enum noside noside)
|
||
{
|
||
if (argc != 1)
|
||
error (_("You must provide one argument for $_creal."));
|
||
|
||
value *cval = argv[0];
|
||
type *ctype = check_typedef (cval->type ());
|
||
if (ctype->code () != TYPE_CODE_COMPLEX)
|
||
error (_("expected a complex number"));
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
return value::zero (ctype->target_type (), not_lval);
|
||
return value_real_part (cval);
|
||
}
|
||
|
||
/* Implementation of the convenience function $_cimag. Extracts the
|
||
imaginary part from a complex number. */
|
||
|
||
static struct value *
|
||
cimag_internal_fn (struct gdbarch *gdbarch,
|
||
const struct language_defn *language,
|
||
void *cookie, int argc,
|
||
struct value **argv, enum noside noside)
|
||
{
|
||
if (argc != 1)
|
||
error (_("You must provide one argument for $_cimag."));
|
||
|
||
value *cval = argv[0];
|
||
type *ctype = check_typedef (cval->type ());
|
||
if (ctype->code () != TYPE_CODE_COMPLEX)
|
||
error (_("expected a complex number"));
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
return value::zero (ctype->target_type (), not_lval);
|
||
return value_imaginary_part (cval);
|
||
}
|
||
|
||
#if GDB_SELF_TEST
|
||
namespace selftests
|
||
{
|
||
|
||
/* Test the ranges_contain function. */
|
||
|
||
static void
|
||
test_ranges_contain ()
|
||
{
|
||
std::vector<range> ranges;
|
||
range r;
|
||
|
||
/* [10, 14] */
|
||
r.offset = 10;
|
||
r.length = 5;
|
||
ranges.push_back (r);
|
||
|
||
/* [20, 24] */
|
||
r.offset = 20;
|
||
r.length = 5;
|
||
ranges.push_back (r);
|
||
|
||
/* [2, 6] */
|
||
SELF_CHECK (!ranges_contain (ranges, 2, 5));
|
||
/* [9, 13] */
|
||
SELF_CHECK (ranges_contain (ranges, 9, 5));
|
||
/* [10, 11] */
|
||
SELF_CHECK (ranges_contain (ranges, 10, 2));
|
||
/* [10, 14] */
|
||
SELF_CHECK (ranges_contain (ranges, 10, 5));
|
||
/* [13, 18] */
|
||
SELF_CHECK (ranges_contain (ranges, 13, 6));
|
||
/* [14, 18] */
|
||
SELF_CHECK (ranges_contain (ranges, 14, 5));
|
||
/* [15, 18] */
|
||
SELF_CHECK (!ranges_contain (ranges, 15, 4));
|
||
/* [16, 19] */
|
||
SELF_CHECK (!ranges_contain (ranges, 16, 4));
|
||
/* [16, 21] */
|
||
SELF_CHECK (ranges_contain (ranges, 16, 6));
|
||
/* [21, 21] */
|
||
SELF_CHECK (ranges_contain (ranges, 21, 1));
|
||
/* [21, 25] */
|
||
SELF_CHECK (ranges_contain (ranges, 21, 5));
|
||
/* [26, 28] */
|
||
SELF_CHECK (!ranges_contain (ranges, 26, 3));
|
||
}
|
||
|
||
/* Check that RANGES contains the same ranges as EXPECTED. */
|
||
|
||
static bool
|
||
check_ranges_vector (gdb::array_view<const range> ranges,
|
||
gdb::array_view<const range> expected)
|
||
{
|
||
return ranges == expected;
|
||
}
|
||
|
||
/* Test the insert_into_bit_range_vector function. */
|
||
|
||
static void
|
||
test_insert_into_bit_range_vector ()
|
||
{
|
||
std::vector<range> ranges;
|
||
|
||
/* [10, 14] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 10, 5);
|
||
static const range expected[] = {
|
||
{10, 5}
|
||
};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
|
||
/* [10, 14] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 11, 4);
|
||
static const range expected = {10, 5};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
|
||
/* [10, 14] [20, 24] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 20, 5);
|
||
static const range expected[] = {
|
||
{10, 5},
|
||
{20, 5},
|
||
};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
|
||
/* [10, 14] [17, 24] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 17, 5);
|
||
static const range expected[] = {
|
||
{10, 5},
|
||
{17, 8},
|
||
};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
|
||
/* [2, 8] [10, 14] [17, 24] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 2, 7);
|
||
static const range expected[] = {
|
||
{2, 7},
|
||
{10, 5},
|
||
{17, 8},
|
||
};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
|
||
/* [2, 14] [17, 24] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 9, 1);
|
||
static const range expected[] = {
|
||
{2, 13},
|
||
{17, 8},
|
||
};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
|
||
/* [2, 14] [17, 24] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 9, 1);
|
||
static const range expected[] = {
|
||
{2, 13},
|
||
{17, 8},
|
||
};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
|
||
/* [2, 33] */
|
||
{
|
||
insert_into_bit_range_vector (&ranges, 4, 30);
|
||
static const range expected = {2, 32};
|
||
SELF_CHECK (check_ranges_vector (ranges, expected));
|
||
}
|
||
}
|
||
|
||
static void
|
||
test_value_copy ()
|
||
{
|
||
type *type = builtin_type (current_inferior ()->arch ())->builtin_int;
|
||
|
||
/* Verify that we can copy an entirely optimized out value, that may not have
|
||
its contents allocated. */
|
||
value_ref_ptr val = release_value (value::allocate_optimized_out (type));
|
||
value_ref_ptr copy = release_value (val->copy ());
|
||
|
||
SELF_CHECK (val->entirely_optimized_out ());
|
||
SELF_CHECK (copy->entirely_optimized_out ());
|
||
}
|
||
|
||
} /* namespace selftests */
|
||
#endif /* GDB_SELF_TEST */
|
||
|
||
void _initialize_values ();
|
||
void
|
||
_initialize_values ()
|
||
{
|
||
cmd_list_element *show_convenience_cmd
|
||
= add_cmd ("convenience", no_class, show_convenience, _("\
|
||
Debugger convenience (\"$foo\") variables and functions.\n\
|
||
Convenience variables are created when you assign them values;\n\
|
||
thus, \"set $foo=1\" gives \"$foo\" the value 1. Values may be any type.\n\
|
||
\n\
|
||
A few convenience variables are given values automatically:\n\
|
||
\"$_\"holds the last address examined with \"x\" or \"info lines\",\n\
|
||
\"$__\" holds the contents of the last address examined with \"x\"."
|
||
#ifdef HAVE_PYTHON
|
||
"\n\n\
|
||
Convenience functions are defined via the Python API."
|
||
#endif
|
||
), &showlist);
|
||
add_alias_cmd ("conv", show_convenience_cmd, no_class, 1, &showlist);
|
||
|
||
add_cmd ("values", no_set_class, show_values, _("\
|
||
Elements of value history around item number IDX (or last ten)."),
|
||
&showlist);
|
||
|
||
add_com ("init-if-undefined", class_vars, init_if_undefined_command, _("\
|
||
Initialize a convenience variable if necessary.\n\
|
||
init-if-undefined VARIABLE = EXPRESSION\n\
|
||
Set an internal VARIABLE to the result of the EXPRESSION if it does not\n\
|
||
exist or does not contain a value. The EXPRESSION is not evaluated if the\n\
|
||
VARIABLE is already initialized."));
|
||
|
||
add_prefix_cmd ("function", no_class, function_command, _("\
|
||
Placeholder command for showing help on convenience functions."),
|
||
&functionlist, 0, &cmdlist);
|
||
|
||
add_internal_function ("_isvoid", _("\
|
||
Check whether an expression is void.\n\
|
||
Usage: $_isvoid (expression)\n\
|
||
Return 1 if the expression is void, zero otherwise."),
|
||
isvoid_internal_fn, NULL);
|
||
|
||
add_internal_function ("_creal", _("\
|
||
Extract the real part of a complex number.\n\
|
||
Usage: $_creal (expression)\n\
|
||
Return the real part of a complex number, the type depends on the\n\
|
||
type of a complex number."),
|
||
creal_internal_fn, NULL);
|
||
|
||
add_internal_function ("_cimag", _("\
|
||
Extract the imaginary part of a complex number.\n\
|
||
Usage: $_cimag (expression)\n\
|
||
Return the imaginary part of a complex number, the type depends on the\n\
|
||
type of a complex number."),
|
||
cimag_internal_fn, NULL);
|
||
|
||
add_setshow_zuinteger_unlimited_cmd ("max-value-size",
|
||
class_support, &max_value_size, _("\
|
||
Set maximum sized value gdb will load from the inferior."), _("\
|
||
Show maximum sized value gdb will load from the inferior."), _("\
|
||
Use this to control the maximum size, in bytes, of a value that gdb\n\
|
||
will load from the inferior. Setting this value to 'unlimited'\n\
|
||
disables checking.\n\
|
||
Setting this does not invalidate already allocated values, it only\n\
|
||
prevents future values, larger than this size, from being allocated."),
|
||
set_max_value_size,
|
||
show_max_value_size,
|
||
&setlist, &showlist);
|
||
set_show_commands vsize_limit
|
||
= add_setshow_zuinteger_unlimited_cmd ("varsize-limit", class_support,
|
||
&max_value_size, _("\
|
||
Set the maximum number of bytes allowed in a variable-size object."), _("\
|
||
Show the maximum number of bytes allowed in a variable-size object."), _("\
|
||
Attempts to access an object whose size is not a compile-time constant\n\
|
||
and exceeds this limit will cause an error."),
|
||
NULL, NULL, &setlist, &showlist);
|
||
deprecate_cmd (vsize_limit.set, "set max-value-size");
|
||
|
||
#if GDB_SELF_TEST
|
||
selftests::register_test ("ranges_contain", selftests::test_ranges_contain);
|
||
selftests::register_test ("insert_into_bit_range_vector",
|
||
selftests::test_insert_into_bit_range_vector);
|
||
selftests::register_test ("value_copy", selftests::test_value_copy);
|
||
#endif
|
||
|
||
/* Destroy any values currently allocated in a final cleanup instead
|
||
of leaving it to global destructors, because that may be too
|
||
late. For example, the destructors of xmethod values call into
|
||
the Python runtime. */
|
||
add_final_cleanup ([] ()
|
||
{
|
||
all_values.clear ();
|
||
});
|
||
}
|