static void
dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc,
- gdb_byte **start, size_t *length);
+ const gdb_byte **start, size_t *length);
/* A helper function for dealing with location lists. Given a
symbol baton (BATON) and a pc value (PC), find the appropriate
For now, only return the first matching location expression; there
can be more than one in the list. */
-static gdb_byte *
+static const gdb_byte *
find_location_expression (struct dwarf2_loclist_baton *baton,
size_t *locexpr_length, CORE_ADDR pc)
{
CORE_ADDR low, high;
- gdb_byte *loc_ptr, *buf_end;
+ const gdb_byte *loc_ptr, *buf_end;
int length;
struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu);
struct gdbarch *gdbarch = get_objfile_arch (objfile);
describing the frame base. Return a pointer to it in START and
its length in LENGTH. */
static void
-dwarf_expr_frame_base (void *baton, gdb_byte **start, size_t * length)
+dwarf_expr_frame_base (void *baton, const gdb_byte **start, size_t * length)
{
/* FIXME: cagney/2003-03-26: This code should be using
get_frame_base_address(), and then implement a dwarf2 specific
static void
dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc,
- gdb_byte **start, size_t *length)
+ const gdb_byte **start, size_t *length)
{
if (SYMBOL_LOCATION_BATON (framefunc) == NULL)
*start = NULL;
struct piece_closure
{
+ /* Reference count. */
+ int refc;
+
/* The number of pieces used to describe this variable. */
int n_pieces;
{
struct piece_closure *c = XZALLOC (struct piece_closure);
+ c->refc = 1;
c->n_pieces = n_pieces;
c->addr_size = addr_size;
c->pieces = XCALLOC (n_pieces, struct dwarf_expr_piece);
return c;
}
+/* The lowest-level function to extract bits from a byte buffer.
+ SOURCE is the buffer. It is updated if we read to the end of a
+ byte.
+ SOURCE_OFFSET_BITS is the offset of the first bit to read. It is
+ updated to reflect the number of bits actually read.
+ NBITS is the number of bits we want to read. It is updated to
+ reflect the number of bits actually read. This function may read
+ fewer bits.
+ BITS_BIG_ENDIAN is taken directly from gdbarch.
+ This function returns the extracted bits. */
+
+static unsigned int
+extract_bits_primitive (const gdb_byte **source,
+ unsigned int *source_offset_bits,
+ int *nbits, int bits_big_endian)
+{
+ unsigned int avail, mask, datum;
+
+ gdb_assert (*source_offset_bits < 8);
+
+ avail = 8 - *source_offset_bits;
+ if (avail > *nbits)
+ avail = *nbits;
+
+ mask = (1 << avail) - 1;
+ datum = **source;
+ if (bits_big_endian)
+ datum >>= 8 - (*source_offset_bits + *nbits);
+ else
+ datum >>= *source_offset_bits;
+ datum &= mask;
+
+ *nbits -= avail;
+ *source_offset_bits += avail;
+ if (*source_offset_bits >= 8)
+ {
+ *source_offset_bits -= 8;
+ ++*source;
+ }
+
+ return datum;
+}
+
+/* Extract some bits from a source buffer and move forward in the
+ buffer.
+
+ SOURCE is the source buffer. It is updated as bytes are read.
+ SOURCE_OFFSET_BITS is the offset into SOURCE. It is updated as
+ bits are read.
+ NBITS is the number of bits to read.
+ BITS_BIG_ENDIAN is taken directly from gdbarch.
+
+ This function returns the bits that were read. */
+
+static unsigned int
+extract_bits (const gdb_byte **source, unsigned int *source_offset_bits,
+ int nbits, int bits_big_endian)
+{
+ unsigned int datum;
+
+ gdb_assert (nbits > 0 && nbits <= 8);
+
+ datum = extract_bits_primitive (source, source_offset_bits, &nbits,
+ bits_big_endian);
+ if (nbits > 0)
+ {
+ unsigned int more;
+
+ more = extract_bits_primitive (source, source_offset_bits, &nbits,
+ bits_big_endian);
+ if (bits_big_endian)
+ datum <<= nbits;
+ else
+ more <<= nbits;
+ datum |= more;
+ }
+
+ return datum;
+}
+
+/* Write some bits into a buffer and move forward in the buffer.
+
+ DATUM is the bits to write. The low-order bits of DATUM are used.
+ DEST is the destination buffer. It is updated as bytes are
+ written.
+ DEST_OFFSET_BITS is the bit offset in DEST at which writing is
+ done.
+ NBITS is the number of valid bits in DATUM.
+ BITS_BIG_ENDIAN is taken directly from gdbarch. */
+
+static void
+insert_bits (unsigned int datum,
+ gdb_byte *dest, unsigned int dest_offset_bits,
+ int nbits, int bits_big_endian)
+{
+ unsigned int mask;
+
+ gdb_assert (dest_offset_bits >= 0 && dest_offset_bits + nbits <= 8);
+
+ mask = (1 << nbits) - 1;
+ if (bits_big_endian)
+ {
+ datum <<= 8 - (dest_offset_bits + nbits);
+ mask <<= 8 - (dest_offset_bits + nbits);
+ }
+ else
+ {
+ datum <<= dest_offset_bits;
+ mask <<= dest_offset_bits;
+ }
+
+ gdb_assert ((datum & ~mask) == 0);
+
+ *dest = (*dest & ~mask) | datum;
+}
+
+/* Copy bits from a source to a destination.
+
+ DEST is where the bits should be written.
+ DEST_OFFSET_BITS is the bit offset into DEST.
+ SOURCE is the source of bits.
+ SOURCE_OFFSET_BITS is the bit offset into SOURCE.
+ BIT_COUNT is the number of bits to copy.
+ BITS_BIG_ENDIAN is taken directly from gdbarch. */
+
+static void
+copy_bitwise (gdb_byte *dest, unsigned int dest_offset_bits,
+ const gdb_byte *source, unsigned int source_offset_bits,
+ unsigned int bit_count,
+ int bits_big_endian)
+{
+ unsigned int dest_avail;
+ int datum;
+
+ /* Reduce everything to byte-size pieces. */
+ dest += dest_offset_bits / 8;
+ dest_offset_bits %= 8;
+ source += source_offset_bits / 8;
+ source_offset_bits %= 8;
+
+ dest_avail = 8 - dest_offset_bits % 8;
+
+ /* See if we can fill the first destination byte. */
+ if (dest_avail < bit_count)
+ {
+ datum = extract_bits (&source, &source_offset_bits, dest_avail,
+ bits_big_endian);
+ insert_bits (datum, dest, dest_offset_bits, dest_avail, bits_big_endian);
+ ++dest;
+ dest_offset_bits = 0;
+ bit_count -= dest_avail;
+ }
+
+ /* Now, either DEST_OFFSET_BITS is byte-aligned, or we have fewer
+ than 8 bits remaining. */
+ gdb_assert (dest_offset_bits % 8 == 0 || bit_count < 8);
+ for (; bit_count >= 8; bit_count -= 8)
+ {
+ datum = extract_bits (&source, &source_offset_bits, 8, bits_big_endian);
+ *dest++ = (gdb_byte) datum;
+ }
+
+ /* Finally, we may have a few leftover bits. */
+ gdb_assert (bit_count <= 8 - dest_offset_bits % 8);
+ if (bit_count > 0)
+ {
+ datum = extract_bits (&source, &source_offset_bits, bit_count,
+ bits_big_endian);
+ insert_bits (datum, dest, dest_offset_bits, bit_count, bits_big_endian);
+ }
+}
+
static void
read_pieced_value (struct value *v)
{
int i;
long offset = 0;
- ULONGEST bytes_to_skip;
+ ULONGEST bits_to_skip;
gdb_byte *contents;
struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (v));
size_t type_len;
+ size_t buffer_size = 0;
+ char *buffer = NULL;
+ struct cleanup *cleanup;
+ int bits_big_endian
+ = gdbarch_bits_big_endian (get_type_arch (value_type (v)));
if (value_type (v) != value_enclosing_type (v))
internal_error (__FILE__, __LINE__,
_("Should not be able to create a lazy value with "
"an enclosing type"));
+ cleanup = make_cleanup (free_current_contents, &buffer);
+
contents = value_contents_raw (v);
- bytes_to_skip = value_offset (v);
- type_len = TYPE_LENGTH (value_type (v));
+ bits_to_skip = 8 * value_offset (v);
+ type_len = 8 * TYPE_LENGTH (value_type (v));
+
for (i = 0; i < c->n_pieces && offset < type_len; i++)
{
struct dwarf_expr_piece *p = &c->pieces[i];
- size_t this_size;
- long dest_offset, source_offset;
-
- if (bytes_to_skip > 0 && bytes_to_skip >= p->size)
+ size_t this_size, this_size_bits;
+ long dest_offset_bits, source_offset_bits, source_offset;
+ const gdb_byte *intermediate_buffer;
+
+ /* Compute size, source, and destination offsets for copying, in
+ bits. */
+ this_size_bits = p->size;
+ if (bits_to_skip > 0 && bits_to_skip >= this_size_bits)
{
- bytes_to_skip -= p->size;
+ bits_to_skip -= this_size_bits;
continue;
}
- this_size = p->size;
- if (this_size > type_len - offset)
- this_size = type_len - offset;
- if (bytes_to_skip > 0)
+ if (this_size_bits > type_len - offset)
+ this_size_bits = type_len - offset;
+ if (bits_to_skip > 0)
{
- dest_offset = 0;
- source_offset = bytes_to_skip;
- this_size -= bytes_to_skip;
- bytes_to_skip = 0;
+ dest_offset_bits = 0;
+ source_offset_bits = bits_to_skip;
+ this_size_bits -= bits_to_skip;
+ bits_to_skip = 0;
}
else
{
- dest_offset = offset;
- source_offset = 0;
+ dest_offset_bits = offset;
+ source_offset_bits = 0;
+ }
+
+ this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8;
+ source_offset = source_offset_bits / 8;
+ if (buffer_size < this_size)
+ {
+ buffer_size = this_size;
+ buffer = xrealloc (buffer, buffer_size);
}
+ intermediate_buffer = buffer;
+ /* Copy from the source to DEST_BUFFER. */
switch (p->location)
{
case DWARF_VALUE_REGISTER:
if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG
&& this_size < register_size (arch, gdb_regnum))
- /* Big-endian, and we want less than full size. */
- reg_offset = register_size (arch, gdb_regnum) - this_size;
+ {
+ /* Big-endian, and we want less than full size. */
+ reg_offset = register_size (arch, gdb_regnum) - this_size;
+ /* We want the lower-order THIS_SIZE_BITS of the bytes
+ we extract from the register. */
+ source_offset_bits += 8 * this_size - this_size_bits;
+ }
if (gdb_regnum != -1)
{
get_frame_register_bytes (frame, gdb_regnum, reg_offset,
- this_size, contents + dest_offset);
+ this_size, buffer);
}
else
{
case DWARF_VALUE_MEMORY:
if (p->v.expr.in_stack_memory)
- read_stack (p->v.expr.value + source_offset,
- contents + dest_offset, this_size);
+ read_stack (p->v.expr.value + source_offset, buffer, this_size);
else
- read_memory (p->v.expr.value + source_offset,
- contents + dest_offset, this_size);
+ read_memory (p->v.expr.value + source_offset, buffer, this_size);
break;
case DWARF_VALUE_STACK:
/* Nothing. */
}
else if (source_offset == 0)
- store_unsigned_integer (contents + dest_offset, n,
+ store_unsigned_integer (buffer, n,
gdbarch_byte_order (gdbarch),
p->v.expr.value);
else
store_unsigned_integer (bytes, n + source_offset,
gdbarch_byte_order (gdbarch),
p->v.expr.value);
- memcpy (contents + dest_offset, bytes + source_offset, n);
+ memcpy (buffer, bytes + source_offset, n);
}
}
break;
? p->v.literal.length - source_offset
: 0);
if (n != 0)
- memcpy (contents + dest_offset,
- p->v.literal.data + source_offset, n);
+ intermediate_buffer = p->v.literal.data + source_offset;
}
break;
/* We just leave the bits empty for now. This is not ideal
but gdb currently does not have a nice way to represent
optimized-out pieces. */
- warning (_("bytes %ld-%ld in computed object were optimized out; "
+ warning (_("bits %ld-%ld in computed object were optimized out; "
"replacing with zeroes"),
offset,
- offset + (long) this_size);
+ offset + (long) this_size_bits);
break;
default:
internal_error (__FILE__, __LINE__, _("invalid location type"));
}
- offset += this_size;
+
+ if (p->location != DWARF_VALUE_OPTIMIZED_OUT)
+ copy_bitwise (contents, dest_offset_bits,
+ intermediate_buffer, source_offset_bits % 8,
+ this_size_bits, bits_big_endian);
+
+ offset += this_size_bits;
}
+
+ do_cleanups (cleanup);
}
static void
{
int i;
long offset = 0;
- ULONGEST bytes_to_skip;
+ ULONGEST bits_to_skip;
const gdb_byte *contents;
struct piece_closure *c = (struct piece_closure *) value_computed_closure (to);
struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (to));
size_t type_len;
+ size_t buffer_size = 0;
+ char *buffer = NULL;
+ struct cleanup *cleanup;
+ int bits_big_endian
+ = gdbarch_bits_big_endian (get_type_arch (value_type (to)));
if (frame == NULL)
{
return;
}
+ cleanup = make_cleanup (free_current_contents, &buffer);
+
contents = value_contents (from);
- bytes_to_skip = value_offset (to);
- type_len = TYPE_LENGTH (value_type (to));
+ bits_to_skip = 8 * value_offset (to);
+ type_len = 8 * TYPE_LENGTH (value_type (to));
for (i = 0; i < c->n_pieces && offset < type_len; i++)
{
struct dwarf_expr_piece *p = &c->pieces[i];
- size_t this_size;
- long dest_offset, source_offset;
+ size_t this_size_bits, this_size;
+ long dest_offset_bits, source_offset_bits, dest_offset, source_offset;
+ int need_bitwise;
+ const gdb_byte *source_buffer;
- if (bytes_to_skip > 0 && bytes_to_skip >= p->size)
+ this_size_bits = p->size;
+ if (bits_to_skip > 0 && bits_to_skip >= this_size_bits)
{
- bytes_to_skip -= p->size;
+ bits_to_skip -= this_size_bits;
continue;
}
- this_size = p->size;
- if (this_size > type_len - offset)
- this_size = type_len - offset;
- if (bytes_to_skip > 0)
+ if (this_size_bits > type_len - offset)
+ this_size_bits = type_len - offset;
+ if (bits_to_skip > 0)
+ {
+ dest_offset_bits = bits_to_skip;
+ source_offset_bits = 0;
+ this_size_bits -= bits_to_skip;
+ bits_to_skip = 0;
+ }
+ else
+ {
+ dest_offset_bits = 0;
+ source_offset_bits = offset;
+ }
+
+ this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8;
+ source_offset = source_offset_bits / 8;
+ dest_offset = dest_offset_bits / 8;
+ if (dest_offset_bits % 8 == 0 && source_offset_bits % 8 == 0)
{
- dest_offset = bytes_to_skip;
- source_offset = 0;
- this_size -= bytes_to_skip;
- bytes_to_skip = 0;
+ source_buffer = contents + source_offset;
+ need_bitwise = 0;
}
else
{
- dest_offset = 0;
- source_offset = offset;
+ if (buffer_size < this_size)
+ {
+ buffer_size = this_size;
+ buffer = xrealloc (buffer, buffer_size);
+ }
+ source_buffer = buffer;
+ need_bitwise = 1;
}
switch (p->location)
if (gdb_regnum != -1)
{
+ if (need_bitwise)
+ {
+ get_frame_register_bytes (frame, gdb_regnum, reg_offset,
+ this_size, buffer);
+ copy_bitwise (buffer, dest_offset_bits,
+ contents, source_offset_bits,
+ this_size_bits,
+ bits_big_endian);
+ }
+
put_frame_register_bytes (frame, gdb_regnum, reg_offset,
- this_size, contents + source_offset);
+ this_size, source_buffer);
}
else
{
}
break;
case DWARF_VALUE_MEMORY:
+ if (need_bitwise)
+ {
+ /* Only the first and last bytes can possibly have any
+ bits reused. */
+ read_memory (p->v.expr.value + dest_offset, buffer, 1);
+ read_memory (p->v.expr.value + dest_offset + this_size - 1,
+ buffer + this_size - 1, 1);
+ copy_bitwise (buffer, dest_offset_bits,
+ contents, source_offset_bits,
+ this_size_bits,
+ bits_big_endian);
+ }
+
write_memory (p->v.expr.value + dest_offset,
- contents + source_offset, this_size);
+ source_buffer, this_size);
break;
default:
set_value_optimized_out (to, 1);
- return;
+ goto done;
}
- offset += this_size;
+ offset += this_size_bits;
}
+
+ done:
+ do_cleanups (cleanup);
}
static void *
{
struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
- return allocate_piece_closure (c->n_pieces, c->pieces, c->addr_size);
+ ++c->refc;
+ return c;
}
static void
{
struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
- xfree (c->pieces);
- xfree (c);
+ --c->refc;
+ if (c->refc == 0)
+ {
+ xfree (c->pieces);
+ xfree (c);
+ }
}
/* Functions for accessing a variable described by DW_OP_piece. */
static struct value *
dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
- gdb_byte *data, unsigned short size,
+ const gdb_byte *data, unsigned short size,
struct dwarf2_per_cu_data *per_cu)
{
struct value *retval;
/* Frame-relative accesses do require a frame. */
static void
-needs_frame_frame_base (void *baton, gdb_byte **start, size_t * length)
+needs_frame_frame_base (void *baton, const gdb_byte **start, size_t * length)
{
static gdb_byte lit0 = DW_OP_lit0;
struct needs_frame_baton *nf_baton = baton;
requires a frame to evaluate. */
static int
-dwarf2_loc_desc_needs_frame (gdb_byte *data, unsigned short size,
+dwarf2_loc_desc_needs_frame (const gdb_byte *data, unsigned short size,
struct dwarf2_per_cu_data *per_cu)
{
struct needs_frame_baton baton;
LONGEST offset;
};
-static gdb_byte *
+static const gdb_byte *
dwarf2_tracepoint_var_loc (struct symbol *symbol,
struct agent_expr *ax,
struct axs_var_loc *loc,
struct gdbarch *gdbarch,
- gdb_byte *data, gdb_byte *end)
+ const gdb_byte *data, const gdb_byte *end)
{
if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31)
{
struct symbol *framefunc;
int frame_reg = 0;
LONGEST frame_offset;
- gdb_byte *base_data;
+ const gdb_byte *base_data;
size_t base_size;
LONGEST base_offset = 0;
if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31)
{
- gdb_byte *buf_end;
-
+ const gdb_byte *buf_end;
+
frame_reg = base_data[0] - DW_OP_breg0;
buf_end = read_sleb128 (base_data + 1,
base_data + base_size, &base_offset);
static void
dwarf2_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
struct agent_expr *ax, struct axs_value *value,
- gdb_byte *data, int size)
+ const gdb_byte *data, int size)
{
- gdb_byte *end = data + size;
+ const gdb_byte *end = data + size;
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* In practice, a variable is not going to be spread across
dozens of registers or memory locations. If someone comes up
/* Describe a single piece of a location, returning an updated
position in the bytecode sequence. */
-static gdb_byte *
+static const gdb_byte *
locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream,
CORE_ADDR addr, struct objfile *objfile,
- gdb_byte *data, int size, unsigned int addr_size)
+ const gdb_byte *data, int size,
+ unsigned int addr_size)
{
struct gdbarch *gdbarch = get_objfile_arch (objfile);
int regno;
struct symbol *framefunc;
int frame_reg = 0;
LONGEST frame_offset;
- gdb_byte *base_data;
+ const gdb_byte *base_data;
size_t base_size;
LONGEST base_offset = 0;
if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31)
{
- gdb_byte *buf_end;
+ const gdb_byte *buf_end;
frame_reg = base_data[0] - DW_OP_breg0;
buf_end = read_sleb128 (base_data + 1,
static void
locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr,
- struct ui_file *stream, gdb_byte *data, int size,
+ struct ui_file *stream,
+ const gdb_byte *data, int size,
struct objfile *objfile, unsigned int addr_size)
{
- gdb_byte *end = data + size;
+ const gdb_byte *end = data + size;
int piece_done = 0, first_piece = 1, bad = 0;
/* A multi-piece description consists of multiple sequences of bytes
{
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
struct value *val;
- gdb_byte *data;
+ const gdb_byte *data;
size_t size;
data = find_location_expression (dlbaton, &size,
{
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
CORE_ADDR low, high;
- gdb_byte *loc_ptr, *buf_end;
+ const gdb_byte *loc_ptr, *buf_end;
int length, first = 1;
struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
struct gdbarch *gdbarch = get_objfile_arch (objfile);
struct agent_expr *ax, struct axs_value *value)
{
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
- gdb_byte *data;
+ const gdb_byte *data;
size_t size;
data = find_location_expression (dlbaton, &size, ax->scope);
projects / binutils-gdb.git / blobdiff