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| author | Tom Tromey <tromey@adacore.com> | 2019-11-05 10:12:27 -0700 |
|---|---|---|
| committer | Tom Tromey <tromey@adacore.com> | 2019-11-14 11:58:50 -0700 |
| commit | 55708e99aca33f2ee9036732d778cd5899d2a2b0 (patch) | |
| tree | e62533e80ec25aa545539f243bb34d82ec125821 /gdb | |
| parent | 6b92c0d3533b8b01970e6ba5aa92581e027a63c2 (diff) | |
| download | binutils-55708e99aca33f2ee9036732d778cd5899d2a2b0.zip binutils-55708e99aca33f2ee9036732d778cd5899d2a2b0.tar.gz binutils-55708e99aca33f2ee9036732d778cd5899d2a2b0.tar.bz2 | |
Allow re-assigning to convenience variables
A customer reported somewhat odd gdb behavior, where re-assigning an
array or string to a convenience variable would yield "Too many array
elements". A test case is:
(gdb) p $x = "x"
(gdb) p $x = "xyz"
This patch fixes the problem by making a special case in the evaluator
for assignment to convenience variables, which seems like the correct
behavior.
Note that a previous patch implemented this for Ada, see commit
f411722cb ("Allow re-assigning to convenience variables").
gdb/ChangeLog
2019-11-14 Tom Tromey <tromey@adacore.com>
* eval.c (evaluate_subexp_standard) <BINOP_ASSIGN>: Do not pass an
expected type for the RHS if the LHS is a convenience variable.
gdb/testsuite/ChangeLog
2019-11-14 Tom Tromey <tromey@adacore.com>
* gdb.base/gdbvars.exp (test_convenience_variables): Add
regression tests.
Change-Id: I5e66a2d243931a5c43c7af4bc9f6717464c2477e
Diffstat (limited to 'gdb')
| -rw-r--r-- | gdb/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/eval.c | 9 | ||||
| -rw-r--r-- | gdb/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.base/gdbvars.exp | 15 |
4 files changed, 33 insertions, 1 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 719574f..1a84242 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2019-11-14 Tom Tromey <tromey@adacore.com> + + * eval.c (evaluate_subexp_standard) <BINOP_ASSIGN>: Do not pass an + expected type for the RHS if the LHS is a convenience variable. + 2019-11-14 Simon Marchi <simon.marchi@polymtl.ca> * unittests/vec-utils-selftests.c (unordered_remove_tests::obj): @@ -2151,7 +2151,14 @@ evaluate_subexp_standard (struct type *expect_type, case BINOP_ASSIGN: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); - arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); + /* Special-case assignments where the left-hand-side is a + convenience variable -- in these, don't bother setting an + expected type. This avoids a weird case where re-assigning a + string or array to an internal variable could error with "Too + many array elements". */ + arg2 = evaluate_subexp (VALUE_LVAL (arg1) == lval_internalvar + ? NULL_TYPE : value_type (arg1), + exp, pos, noside); if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) return arg1; diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 7416b82..3a4d229 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2019-11-14 Tom Tromey <tromey@adacore.com> + + * gdb.base/gdbvars.exp (test_convenience_variables): Add + regression tests. + 2019-11-12 Tom Tromey <tom@tromey.com> * lib/tuiterm.exp (_accept): Add wait_for parameter. Check output diff --git a/gdb/testsuite/gdb.base/gdbvars.exp b/gdb/testsuite/gdb.base/gdbvars.exp index 8259115..a4e5b41 100644 --- a/gdb/testsuite/gdb.base/gdbvars.exp +++ b/gdb/testsuite/gdb.base/gdbvars.exp @@ -51,6 +51,21 @@ proc test_convenience_variables {} { gdb_test "print \$bar" " = void" \ "Print contents of uninitialized convenience variable" + + + gdb_test "print \$str = \"some string\"" \ + " = \"some string\"" \ + "Set convenience variable to string value" + gdb_test "print \$str = \"some other string\"" \ + " = \"some other string\"" \ + "Change convenience variable to different string value" + + gdb_test "print \$arr = {1, 2, 3}" \ + " = \\{1, 2, 3\\}" \ + "Set convenience variable to array value" + gdb_test "print \$arr = {0, 1, 2, 3}" \ + " = \\{0, 1, 2, 3\\}" \ + "Set convenience variable to different array value" } proc test_convenience_functions {} { |