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Allow re-assigning to convenience variables 

In Ada mode, re-assigning an array of a different size to a
convenience variable will cause an error:

    (gdb) set lang ada
    (gdb) set $v := "abc"
    (gdb) set $v := "abcd"
    cannot assign arrays of different length

However, this does not really make sense -- instead, it should always
be possible to overwrite a convenience variable.

This patch fixes this bug.

This was reviewed off-list by Joel.  I'm checking it in.

gdb/ChangeLog
2019-06-14  Tom Tromey  <tromey@adacore.com>

	* ada-lang.c (ada_evaluate_subexp) <case BINOP_ASSIGN>: Always
	allow assignment to an internalvar.

gdb/testsuite/ChangeLog
2019-06-14  Tom Tromey  <tromey@adacore.com>

	* gdb.ada/set_wstr.exp: Add reassignment test.
This commit is contained in:
Tom Tromey 2019-06-05 10:53:16 -06:00
parent 4268ec187d
commit f411722cbc
4 changed files with 19 additions and 1 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2019-06-14 Tom Tromey <tromey@adacore.com>
* ada-lang.c (ada_evaluate_subexp) <case BINOP_ASSIGN>: Always
allow assignment to an internalvar.
2019-06-14 Tom Tromey <tromey@adacore.com>
* ada-lex.l: Allow "_" in attribute names.

6
gdb/ada-lang.c
View File

@ -10486,7 +10486,11 @@ ada_evaluate_subexp (struct type *expect_type, struct expression *exp,
arg2 = evaluate_subexp (type, exp, pos, noside);
if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
return arg1;
if (ada_is_fixed_point_type (value_type (arg1)))
if (VALUE_LVAL (arg1) == lval_internalvar)
{
/* Nothing. */
}
else if (ada_is_fixed_point_type (value_type (arg1)))
arg2 = cast_to_fixed (value_type (arg1), arg2);
else if (ada_is_fixed_point_type (value_type (arg2)))
error

4
gdb/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2019-06-14 Tom Tromey <tromey@adacore.com>
* gdb.ada/set_wstr.exp: Add reassignment test.
2019-06-14 Tom Tromey <tromey@adacore.com>
* gdb.ada/formatted_ref.exp (test_p_x_addr): Check

5
gdb/testsuite/gdb.ada/set_wstr.exp
View File

@ -72,3 +72,8 @@ gdb_test "print rws" \
gdb_test "set variable www := \"1#2#3#4#5#\"" \
"cannot assign arrays of different length"
# However, reassigning an array of a different length should work when
# the LHS is a convenience variable.
gdb_test_no_output "set variable \$str := \"1234\""
gdb_test_no_output "set variable \$str := \"12345\""