read/write_pieced_value: Merge into one function
Since read_pieced_value and write_pieced_value share significant logic, this patch merges them into a single function rw_pieced_value. gdb/ChangeLog: * dwarf2loc.c (rw_pieced_value): New. Merge logic from... (read_pieced_value, write_pieced_value): ...here. Reduce to wrappers that just call rw_pieced_value.
This commit is contained in:
Andreas Arnez
parent
f65e204425
commit
55acdf2242
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@ -1,3 +1,9 @@
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2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
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* dwarf2loc.c (rw_pieced_value): New. Merge logic from...
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(read_pieced_value, write_pieced_value): ...here. Reduce to
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wrappers that just call rw_pieced_value.
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2017-06-13 Andreas Arnez <arnez@linux.vnet.ibm.com>
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* dwarf2loc.c (write_pieced_value): When writing the data for a
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406
gdb/dwarf2loc.c
406
gdb/dwarf2loc.c
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@ -1761,31 +1761,55 @@ bits_to_bytes (ULONGEST start, ULONGEST n_bits)
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return (start % 8 + n_bits + 7) / 8;
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}
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/* Read or write a pieced value V. If FROM != NULL, operate in "write
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mode": copy FROM into the pieces comprising V. If FROM == NULL,
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operate in "read mode": fetch the contents of the (lazy) value V by
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composing it from its pieces. */
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static void
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read_pieced_value (struct value *v)
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rw_pieced_value (struct value *v, struct value *from)
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{
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int i;
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LONGEST offset = 0, max_offset;
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ULONGEST bits_to_skip;
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gdb_byte *contents;
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gdb_byte *v_contents;
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const gdb_byte *from_contents;
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struct piece_closure *c
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= (struct piece_closure *) value_computed_closure (v);
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std::vector<gdb_byte> buffer;
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int bits_big_endian
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= gdbarch_bits_big_endian (get_type_arch (value_type (v)));
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if (value_type (v) != value_enclosing_type (v))
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internal_error (__FILE__, __LINE__,
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_("Should not be able to create a lazy value with "
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"an enclosing type"));
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if (from != NULL)
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{
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from_contents = value_contents (from);
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v_contents = NULL;
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}
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else
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{
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if (value_type (v) != value_enclosing_type (v))
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internal_error (__FILE__, __LINE__,
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_("Should not be able to create a lazy value with "
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"an enclosing type"));
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v_contents = value_contents_raw (v);
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from_contents = NULL;
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}
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contents = value_contents_raw (v);
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bits_to_skip = 8 * value_offset (v);
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if (value_bitsize (v))
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{
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bits_to_skip += (8 * value_offset (value_parent (v))
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+ value_bitpos (v));
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max_offset = value_bitsize (v);
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if (from != NULL
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&& (gdbarch_byte_order (get_type_arch (value_type (from)))
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== BFD_ENDIAN_BIG))
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{
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/* Use the least significant bits of FROM. */
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max_offset = 8 * TYPE_LENGTH (value_type (from));
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offset = max_offset - value_bitsize (v);
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}
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else
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max_offset = value_bitsize (v);
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}
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else
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max_offset = 8 * TYPE_LENGTH (value_type (v));
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@ -1794,165 +1818,6 @@ read_pieced_value (struct value *v)
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for (i = 0; i < c->n_pieces && bits_to_skip >= c->pieces[i].size; i++)
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bits_to_skip -= c->pieces[i].size;
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for (; i < c->n_pieces && offset < max_offset; i++)
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{
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struct dwarf_expr_piece *p = &c->pieces[i];
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size_t this_size, this_size_bits;
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this_size_bits = p->size - bits_to_skip;
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if (this_size_bits > max_offset - offset)
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this_size_bits = max_offset - offset;
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/* Copy from the source to DEST_BUFFER. */
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switch (p->location)
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{
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case DWARF_VALUE_REGISTER:
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{
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struct frame_info *frame = frame_find_by_id (c->frame_id);
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struct gdbarch *arch = get_frame_arch (frame);
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int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno);
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ULONGEST reg_bits = 8 * register_size (arch, gdb_regnum);
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int optim, unavail;
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if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG
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&& p->offset + p->size < reg_bits)
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{
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/* Big-endian, and we want less than full size. */
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bits_to_skip += reg_bits - (p->offset + p->size);
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}
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else
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bits_to_skip += p->offset;
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this_size = bits_to_bytes (bits_to_skip, this_size_bits);
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buffer.reserve (this_size);
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if (!get_frame_register_bytes (frame, gdb_regnum,
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bits_to_skip / 8,
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this_size, buffer.data (),
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&optim, &unavail))
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{
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if (optim)
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mark_value_bits_optimized_out (v, offset, this_size_bits);
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if (unavail)
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mark_value_bits_unavailable (v, offset, this_size_bits);
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break;
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}
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copy_bitwise (contents, offset,
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buffer.data (), bits_to_skip % 8,
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this_size_bits, bits_big_endian);
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}
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break;
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case DWARF_VALUE_MEMORY:
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bits_to_skip += p->offset;
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this_size = bits_to_bytes (bits_to_skip, this_size_bits);
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buffer.reserve (this_size);
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read_value_memory (v, offset,
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p->v.mem.in_stack_memory,
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p->v.mem.addr + bits_to_skip / 8,
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buffer.data (), this_size);
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copy_bitwise (contents, offset,
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buffer.data (), bits_to_skip % 8,
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this_size_bits, bits_big_endian);
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break;
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case DWARF_VALUE_STACK:
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{
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struct objfile *objfile = dwarf2_per_cu_objfile (c->per_cu);
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struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile);
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ULONGEST stack_value_size_bits
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= 8 * TYPE_LENGTH (value_type (p->v.value));
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/* Use zeroes if piece reaches beyond stack value. */
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if (p->offset + p->size > stack_value_size_bits)
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break;
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/* Piece is anchored at least significant bit end. */
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if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG)
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bits_to_skip += stack_value_size_bits - p->offset - p->size;
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else
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bits_to_skip += p->offset;
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copy_bitwise (contents, offset,
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value_contents_all (p->v.value),
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bits_to_skip,
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this_size_bits, bits_big_endian);
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}
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break;
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case DWARF_VALUE_LITERAL:
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{
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ULONGEST literal_size_bits = 8 * p->v.literal.length;
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size_t n = this_size_bits;
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/* Cut off at the end of the implicit value. */
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bits_to_skip += p->offset;
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if (bits_to_skip >= literal_size_bits)
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break;
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if (n > literal_size_bits - bits_to_skip)
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n = literal_size_bits - bits_to_skip;
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copy_bitwise (contents, offset,
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p->v.literal.data, bits_to_skip,
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n, bits_big_endian);
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}
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break;
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/* These bits show up as zeros -- but do not cause the value
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to be considered optimized-out. */
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case DWARF_VALUE_IMPLICIT_POINTER:
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break;
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case DWARF_VALUE_OPTIMIZED_OUT:
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mark_value_bits_optimized_out (v, offset, this_size_bits);
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break;
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default:
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internal_error (__FILE__, __LINE__, _("invalid location type"));
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}
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offset += this_size_bits;
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bits_to_skip = 0;
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}
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}
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static void
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write_pieced_value (struct value *to, struct value *from)
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{
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int i;
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ULONGEST bits_to_skip;
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LONGEST offset = 0, max_offset;
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const gdb_byte *contents;
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struct piece_closure *c
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= (struct piece_closure *) value_computed_closure (to);
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std::vector<gdb_byte> buffer;
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int bits_big_endian
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= gdbarch_bits_big_endian (get_type_arch (value_type (to)));
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contents = value_contents (from);
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bits_to_skip = 8 * value_offset (to);
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if (value_bitsize (to))
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{
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bits_to_skip += (8 * value_offset (value_parent (to))
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+ value_bitpos (to));
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/* Use the least significant bits of FROM. */
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if (gdbarch_byte_order (get_type_arch (value_type (from)))
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== BFD_ENDIAN_BIG)
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{
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max_offset = 8 * TYPE_LENGTH (value_type (from));
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offset = max_offset - value_bitsize (to);
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}
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else
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max_offset = value_bitsize (to);
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}
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else
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max_offset = 8 * TYPE_LENGTH (value_type (to));
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/* Advance to the first non-skipped piece. */
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for (i = 0; i < c->n_pieces && bits_to_skip >= c->pieces[i].size; i++)
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bits_to_skip -= c->pieces[i].size;
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for (; i < c->n_pieces && offset < max_offset; i++)
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{
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struct dwarf_expr_piece *p = &c->pieces[i];
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@ -1970,6 +1835,7 @@ write_pieced_value (struct value *to, struct value *from)
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struct gdbarch *arch = get_frame_arch (frame);
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int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno);
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ULONGEST reg_bits = 8 * register_size (arch, gdb_regnum);
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int optim, unavail;
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if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG
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&& p->offset + p->size < reg_bits)
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@ -1983,17 +1849,38 @@ write_pieced_value (struct value *to, struct value *from)
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this_size = bits_to_bytes (bits_to_skip, this_size_bits);
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buffer.reserve (this_size);
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if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
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if (from == NULL)
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{
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/* Data is copied non-byte-aligned into the register.
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Need some bits from original register value. */
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int optim, unavail;
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/* Read mode. */
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if (!get_frame_register_bytes (frame, gdb_regnum,
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bits_to_skip / 8,
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this_size, buffer.data (),
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&optim, &unavail))
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{
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if (optim)
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mark_value_bits_optimized_out (v, offset,
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this_size_bits);
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if (unavail)
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mark_value_bits_unavailable (v, offset,
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this_size_bits);
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break;
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}
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copy_bitwise (v_contents, offset,
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buffer.data (), bits_to_skip % 8,
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this_size_bits, bits_big_endian);
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}
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else
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{
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/* Write mode. */
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if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
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{
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/* Data is copied non-byte-aligned into the register.
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Need some bits from original register value. */
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get_frame_register_bytes (frame, gdb_regnum,
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bits_to_skip / 8,
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this_size, buffer.data (),
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&optim, &unavail);
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if (optim)
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throw_error (OPTIMIZED_OUT_ERROR,
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_("Can't do read-modify-write to "
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@ -2001,20 +1888,21 @@ write_pieced_value (struct value *to, struct value *from)
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"has been optimized out"));
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if (unavail)
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throw_error (NOT_AVAILABLE_ERROR,
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_("Can't do read-modify-write to update "
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"bitfield; containing word "
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_("Can't do read-modify-write to "
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"update bitfield; containing word "
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"is unavailable"));
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}
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}
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copy_bitwise (buffer.data (), bits_to_skip % 8,
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contents, offset,
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this_size_bits, bits_big_endian);
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put_frame_register_bytes (frame, gdb_regnum,
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bits_to_skip / 8,
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this_size, buffer.data ());
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copy_bitwise (buffer.data (), bits_to_skip % 8,
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from_contents, offset,
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this_size_bits, bits_big_endian);
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put_frame_register_bytes (frame, gdb_regnum,
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bits_to_skip / 8,
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this_size, buffer.data ());
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}
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}
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break;
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case DWARF_VALUE_MEMORY:
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{
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bits_to_skip += p->offset;
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@ -2025,48 +1913,156 @@ write_pieced_value (struct value *to, struct value *from)
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&& offset % 8 == 0)
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{
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/* Everything is byte-aligned; no buffer needed. */
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write_memory_with_notification (start_addr,
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contents + offset / 8,
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this_size_bits / 8);
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if (from != NULL)
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write_memory_with_notification (start_addr,
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(from_contents
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+ offset / 8),
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this_size_bits / 8);
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else
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read_value_memory (v, offset,
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p->v.mem.in_stack_memory,
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p->v.mem.addr + bits_to_skip / 8,
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v_contents + offset / 8,
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this_size_bits / 8);
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break;
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}
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this_size = bits_to_bytes (bits_to_skip, this_size_bits);
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buffer.reserve (this_size);
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if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
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if (from == NULL)
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{
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if (this_size <= 8)
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{
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/* Perform a single read for small sizes. */
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read_memory (start_addr, buffer.data (), this_size);
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}
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else
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{
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/* Only the first and last bytes can possibly have any
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bits reused. */
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read_memory (start_addr, buffer.data (), 1);
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read_memory (start_addr + this_size - 1,
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&buffer[this_size - 1], 1);
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}
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/* Read mode. */
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read_value_memory (v, offset,
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p->v.mem.in_stack_memory,
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p->v.mem.addr + bits_to_skip / 8,
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buffer.data (), this_size);
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copy_bitwise (v_contents, offset,
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buffer.data (), bits_to_skip % 8,
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this_size_bits, bits_big_endian);
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}
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else
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{
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/* Write mode. */
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if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
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{
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if (this_size <= 8)
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{
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/* Perform a single read for small sizes. */
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read_memory (start_addr, buffer.data (),
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this_size);
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}
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else
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{
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/* Only the first and last bytes can possibly have
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any bits reused. */
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read_memory (start_addr, buffer.data (), 1);
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read_memory (start_addr + this_size - 1,
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&buffer[this_size - 1], 1);
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}
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}
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copy_bitwise (buffer.data (), bits_to_skip % 8,
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contents, offset,
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this_size_bits, bits_big_endian);
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write_memory_with_notification (start_addr, buffer.data (),
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this_size);
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copy_bitwise (buffer.data (), bits_to_skip % 8,
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from_contents, offset,
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this_size_bits, bits_big_endian);
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write_memory_with_notification (start_addr,
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buffer.data (),
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this_size);
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}
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}
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break;
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default:
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mark_value_bytes_optimized_out (to, 0, TYPE_LENGTH (value_type (to)));
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case DWARF_VALUE_STACK:
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{
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if (from != NULL)
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{
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mark_value_bits_optimized_out (v, offset, this_size_bits);
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break;
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}
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struct objfile *objfile = dwarf2_per_cu_objfile (c->per_cu);
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struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile);
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ULONGEST stack_value_size_bits
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= 8 * TYPE_LENGTH (value_type (p->v.value));
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/* Use zeroes if piece reaches beyond stack value. */
|
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if (p->offset + p->size > stack_value_size_bits)
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break;
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/* Piece is anchored at least significant bit end. */
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if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG)
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bits_to_skip += stack_value_size_bits - p->offset - p->size;
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else
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bits_to_skip += p->offset;
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copy_bitwise (v_contents, offset,
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value_contents_all (p->v.value),
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bits_to_skip,
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this_size_bits, bits_big_endian);
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}
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break;
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case DWARF_VALUE_LITERAL:
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{
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if (from != NULL)
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{
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mark_value_bits_optimized_out (v, offset, this_size_bits);
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break;
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}
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ULONGEST literal_size_bits = 8 * p->v.literal.length;
|
||||
size_t n = this_size_bits;
|
||||
|
||||
/* Cut off at the end of the implicit value. */
|
||||
bits_to_skip += p->offset;
|
||||
if (bits_to_skip >= literal_size_bits)
|
||||
break;
|
||||
if (n > literal_size_bits - bits_to_skip)
|
||||
n = literal_size_bits - bits_to_skip;
|
||||
|
||||
copy_bitwise (v_contents, offset,
|
||||
p->v.literal.data, bits_to_skip,
|
||||
n, bits_big_endian);
|
||||
}
|
||||
break;
|
||||
|
||||
case DWARF_VALUE_IMPLICIT_POINTER:
|
||||
if (from != NULL)
|
||||
{
|
||||
mark_value_bits_optimized_out (v, offset, this_size_bits);
|
||||
break;
|
||||
}
|
||||
|
||||
/* These bits show up as zeros -- but do not cause the value to
|
||||
be considered optimized-out. */
|
||||
break;
|
||||
|
||||
case DWARF_VALUE_OPTIMIZED_OUT:
|
||||
mark_value_bits_optimized_out (v, offset, this_size_bits);
|
||||
break;
|
||||
|
||||
default:
|
||||
internal_error (__FILE__, __LINE__, _("invalid location type"));
|
||||
}
|
||||
|
||||
offset += this_size_bits;
|
||||
bits_to_skip = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
read_pieced_value (struct value *v)
|
||||
{
|
||||
rw_pieced_value (v, NULL);
|
||||
}
|
||||
|
||||
static void
|
||||
write_pieced_value (struct value *to, struct value *from)
|
||||
{
|
||||
rw_pieced_value (to, from);
|
||||
}
|
||||
|
||||
/* An implementation of an lval_funcs method to see whether a value is
|
||||
a synthetic pointer. */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue