4e962e74e4
In Ada, the programmer can request that a range type with a non-zero base be stored in the minimal number of bits required for the range. This is done by biasing the values; so, for example, a range of -7..-4 may be stored as two bits with a bias of -7. This patch implements this for gdb. It is done by adding a bias to struct range_bounds and then adjusting a few spots to handle this. The test case is written to use -fgnat-encodings=minimal, but a future compiler patch will change the compiler to emit DW_AT_GNU_bias with -fgnat-encodings=gdb. It seemed good to get the gdb patch in first. Tested on x86-64 Fedora 29; plus a variety of targets using AdaCore's internal test suite. gdb/ChangeLog 2019-09-03 Tom Tromey <tromey@adacore.com> * ada-valprint.c (ada_val_print_num): Don't recurse for range types. (has_negatives): Unbias a range type bound. * dwarf2read.c (read_subrange_type): Handle DW_AT_GNU_bias. * gdbtypes.c (operator==): Handle new field. (create_range_type): Add "bias" parameter. (create_static_range_type, resolve_dynamic_range): Update. * gdbtypes.h (struct range_bounds) <bias>: New member. (create_range_type): Add bias parameter. * printcmd.c (print_scalar_formatted): Unbias range types. * value.c (unpack_long): Unbias range types. (pack_long): Bias range types. gdb/testsuite/ChangeLog 2019-09-03 Tom Tromey <tromey@adacore.com> * gdb.ada/bias.exp: New file. * gdb.ada/bias/bias.adb: New file. * gdb.ada/print_chars.exp: Add regression test. * gdb.ada/print_chars/foo.adb (My_Character): New type. (MC): New variable.
42 lines
1.2 KiB
Text
42 lines
1.2 KiB
Text
# Copyright 2007-2019 Free Software Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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load_lib "ada.exp"
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standard_ada_testfile foo
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if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug additional_flags=-gnat05 ]] != "" } {
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return -1
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}
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clean_restart ${testfile}
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set bp_location [gdb_get_line_number "START" ${testdir}/foo.adb]
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runto "foo.adb:$bp_location"
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gdb_test "print C" \
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"= 97 'a'" \
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"print C"
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gdb_test "print WC" \
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"= 98 'b'" \
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"print WC"
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gdb_test "print WWC" \
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"= 99 'c'" \
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"print WWC"
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gdb_test "print MC" " = 77 'M'"
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