[Ada] Allow assignment to wide string.
Given the following variable declaration...
Www : Wide_String := "12345";
... this patch allows the following assignment to work:
(gdb) set variable www := "qwert"
Without this patch, the debugger rejects the assignment because
the size of the array elements are different:
(gdb) set www := "asdfg"
Incompatible types in assignment
(on the lhs, we have an array of 2-bytes elements, and on the rhs,
we have a standard 1-byte string).
gdb/ChangeLog:
* ada-lang.c (ada_same_array_size_p): New function.
(ada_promote_array_of_integrals): New function.
(coerce_for_assign): Add handling of arrays where the elements
are integrals of a smaller size than the size of the target
array element type.
gdb/testsuite/ChangeLog:
* gdb.ada/set_wstr: New testcase.
This commit is contained in:
Joel Brobecker
parent
3256027470
commit
d99dcf51e1
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@ -1,3 +1,11 @@
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2012-10-24 Joel Brobecker <brobecker@adacore.com>
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* ada-lang.c (ada_same_array_size_p): New function.
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(ada_promote_array_of_integrals): New function.
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(coerce_for_assign): Add handling of arrays where the elements
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are integrals of a smaller size than the size of the target
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array element type.
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2012-10-24 Joel Brobecker <brobecker@adacore.com>
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* doublest.c (convert_doublest_to_floatformat): Fix comparison
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@ -8629,6 +8629,72 @@ cast_from_fixed (struct type *type, struct value *arg)
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return value_from_double (type, val);
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}
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/* Given two array types T1 and T2, return nonzero iff both arrays
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contain the same number of elements. */
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static int
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ada_same_array_size_p (struct type *t1, struct type *t2)
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{
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LONGEST lo1, hi1, lo2, hi2;
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/* Get the array bounds in order to verify that the size of
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the two arrays match. */
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if (!get_array_bounds (t1, &lo1, &hi1)
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|| !get_array_bounds (t2, &lo2, &hi2))
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error (_("unable to determine array bounds"));
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/* To make things easier for size comparison, normalize a bit
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the case of empty arrays by making sure that the difference
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between upper bound and lower bound is always -1. */
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if (lo1 > hi1)
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hi1 = lo1 - 1;
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if (lo2 > hi2)
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hi2 = lo2 - 1;
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return (hi1 - lo1 == hi2 - lo2);
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}
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/* Assuming that VAL is an array of integrals, and TYPE represents
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an array with the same number of elements, but with wider integral
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elements, return an array "casted" to TYPE. In practice, this
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means that the returned array is built by casting each element
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of the original array into TYPE's (wider) element type. */
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static struct value *
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ada_promote_array_of_integrals (struct type *type, struct value *val)
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{
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struct type *elt_type = TYPE_TARGET_TYPE (type);
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LONGEST lo, hi;
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struct value *res;
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LONGEST i;
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/* Verify that both val and type are arrays of scalars, and
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that the size of val's elements is smaller than the size
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of type's element. */
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gdb_assert (TYPE_CODE (type) == TYPE_CODE_ARRAY);
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gdb_assert (is_integral_type (TYPE_TARGET_TYPE (type)));
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gdb_assert (TYPE_CODE (value_type (val)) == TYPE_CODE_ARRAY);
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gdb_assert (is_integral_type (TYPE_TARGET_TYPE (value_type (val))));
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gdb_assert (TYPE_LENGTH (TYPE_TARGET_TYPE (type))
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> TYPE_LENGTH (TYPE_TARGET_TYPE (value_type (val))));
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if (!get_array_bounds (type, &lo, &hi))
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error (_("unable to determine array bounds"));
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res = allocate_value (type);
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/* Promote each array element. */
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for (i = 0; i < hi - lo + 1; i++)
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{
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struct value *elt = value_cast (elt_type, value_subscript (val, lo + i));
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memcpy (value_contents_writeable (res) + (i * TYPE_LENGTH (elt_type)),
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value_contents_all (elt), TYPE_LENGTH (elt_type));
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}
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return res;
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}
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/* Coerce VAL as necessary for assignment to an lval of type TYPE, and
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return the converted value. */
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@ -8653,9 +8719,21 @@ coerce_for_assign (struct type *type, struct value *val)
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if (TYPE_CODE (type2) == TYPE_CODE_ARRAY
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&& TYPE_CODE (type) == TYPE_CODE_ARRAY)
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{
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if (TYPE_LENGTH (type2) != TYPE_LENGTH (type)
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|| TYPE_LENGTH (TYPE_TARGET_TYPE (type2))
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!= TYPE_LENGTH (TYPE_TARGET_TYPE (type2)))
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if (!ada_same_array_size_p (type, type2))
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error (_("cannot assign arrays of different length"));
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if (is_integral_type (TYPE_TARGET_TYPE (type))
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&& is_integral_type (TYPE_TARGET_TYPE (type2))
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&& TYPE_LENGTH (TYPE_TARGET_TYPE (type2))
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< TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
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{
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/* Allow implicit promotion of the array elements to
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a wider type. */
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return ada_promote_array_of_integrals (type, val);
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}
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if (TYPE_LENGTH (TYPE_TARGET_TYPE (type2))
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!= TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
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error (_("Incompatible types in assignment"));
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deprecated_set_value_type (val, type);
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}
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@ -1,3 +1,7 @@
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2012-10-24 Joel Brobecker <brobecker@adacore.com>
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* gdb.ada/set_wstr: New testcase.
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2012-10-24 Joel Brobecker <brobecker@adacore.com>
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* gdb.base/ldbl_e308.c, gdb.base/ldbl_e308.exp: New files.
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@ -0,0 +1,74 @@
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# Copyright 2012 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 a
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if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug ]] != "" } {
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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 "STOP" ${testdir}/a.adb]
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if ![runto "a.adb:$bp_location" ] then {
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perror "Couldn't run ${testfile}"
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return
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}
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# Verify that assigning to Nnn (a basic string) works...
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gdb_test "print nnn" \
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"= \"12345\"" \
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"print nnn before assignment"
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gdb_test_no_output "set variable nnn := \"qcyom\""
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gdb_test "print nnn" \
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"= \"qcyom\"" \
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"print nnn after assignment"
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# Same with Www (a wide string)...
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gdb_test "print www" \
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"= \"12345\"" \
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"print www before assignment"
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gdb_test_no_output "set variable www := \"zenrk\""
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gdb_test "print www" \
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"= \"zenrk\"" \
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"print www after assignment"
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# Same with Rws (a wide wide string)...
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gdb_test "print rws" \
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"= \"12345\"" \
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"print rws before assignment"
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gdb_test_no_output "set variable rws := \"ndhci\""
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gdb_test "print rws" \
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"= \"ndhci\"" \
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"print rws after assignment"
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# Also, check that GDB doesn't get tricked if we assign to Www a
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# string twice the length of Www. The debugger should reject the
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# assignment, because the array lengths are different (the debugger
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# used to get tricked because the array size was the same).
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gdb_test "set variable www := \"1#2#3#4#5#\"" \
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"cannot assign arrays of different length"
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@ -0,0 +1,26 @@
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-- Copyright 2012 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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with Pck; use Pck;
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procedure A is
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Nnn : String := "12345";
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Www : Wide_String := "12345";
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Rws : Wide_Wide_String := "12345";
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begin
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Do_Nothing (Nnn'Address); -- STOP
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Do_Nothing (Www'Address);
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Do_Nothing (Rws'Address);
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end A;
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@ -0,0 +1,21 @@
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-- Copyright 2012 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 body Pck is
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procedure Do_Nothing (A : System.Address) is
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begin
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null;
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end Do_Nothing;
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end Pck;
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@ -0,0 +1,19 @@
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-- Copyright 2012 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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with System;
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package Pck is
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procedure Do_Nothing (A : System.Address);
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end Pck;
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