bfca584fae
This change is relevant only for standard DWARF (as opposed to the GNAT encodings extensions): at the time of writing it only makes a difference with GCC patches that are to be integrated: see the patch series submission at <https://gcc.gnu.org/ml/gcc-patches/2015-07/msg01353.html>. Given the following Ada declarations: subtype Small_Int is Natural range 0 .. 100; type R_Type (L : Small_Int := 0) is record S : String (1 .. L); end record; type A_Type is array (Natural range <>) of R_Type; A : A_Type := (1 => (L => 0, S => ""), 2 => (L => 2, S => "ab")); Before this change, we would get the following GDB session: (gdb) ptype a type = array (1 .. 2) of foo.r_type <packed: 838-bit elements> This is wrong: "a" is not a packed array. This output comes from the fact that, because R_Type has a dynamic size (with a maximum), the compiler has to describe in the debugging information the size allocated for each array element (i.e. the stride, in DWARF parlance: see DW_AT_byte_stride). Ada type printing currently assumes that arrays with a stride are packed, hence the above output. In practice, GNAT never performs bit-packing for arrays that contain variable-sized elements. Leveraging this fact, this patch enhances type printing so that ptype does not pretend that arrays are packed when they have a stride and they contain dynamic elements. After this change, we get the following expected output: (gdb) ptype a type = array (1 .. 2) of foo.r_type gdb/ChangeLog: * ada-typeprint.c (print_array_type): Do not describe arrays as packed when they embed dynamic elements. gdb/testsuite/ChangeLog: * gdb.ada/array_of_variable_length.exp: New testcase. * gdb.ada/array_of_variable_length/foo.adb: New file. * gdb.ada/array_of_variable_length/pck.adb: New file. * gdb.ada/array_of_variable_length/pck.ads: New file. Tested on x86_64-linux, no regression.
32 lines
1 KiB
Ada
32 lines
1 KiB
Ada
-- Copyright 2015 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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package Pck is
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subtype Small_Int is Natural range 0 .. 100;
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type R_Type (L : Small_Int := 0) is record
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S : String (1 .. L);
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end record;
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type A_Type is array (Natural range <>) of R_Type;
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A : A_Type :=
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(1 => (L => 0, S => ""),
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2 => (L => 2, S => "ab"));
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procedure Do_Nothing (A : A_Type);
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end Pck;
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