From b9a3f8429b012b753e30a4222bd8e4cbba019fad Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Thu, 13 Jun 2019 00:06:52 +0100 Subject: [PATCH] Fix TID parser bug I noticed this inconsistency in the error messages below: (gdb) print --1 Left operand of assignment is not an lvalue. (gdb) thread apply 1 print --1 Thread 1 (Thread 0x7ffff7fb6740 (LWP 17805)): inverted range The "inverted range" error happens because get_number_trailer returns 0 to indicate error, but number_or_range_parser::get_number is not checking for that. I tried detected the error there, but that doesn't work because number_of_range_parser is used in places that _do_ want to legitimately handle 0. IMO we should fix get_number_trailer's interface or use something else when we want to parse 0 too. I've decided to fix it in a different way, similarly to how number_or_range_parser::finished was changed in commit 529c08b25ec7 ("Add helper functions parse_flags and parse_flags_qcs"). Seems like a good change, even if we tweaked number_or_range_parser::get_number, as it simplifies thread_apply_command and makes them consistent with number_or_range_parser::finished(). We now get the same error message in both cases: (gdb) print --1 Left operand of assignment is not an lvalue. (gdb) thread apply 1 print --1 Thread 1 (Thread 0x7ffff7fb6740 (LWP 17805)): Left operand of assignment is not an lvalue. gdb/ChangeLog: 2019-06-13 Pedro Alves * thread.c (thread_apply_command): Adjust TID parsing. * tid-parse.c (tid_range_parser::finished): Ensure parsing end is detected before end of string. (tid_is_in_list): Error out if LIST is invalid. gdb/testsuite/ChangeLog: 2019-06-13 Pedro Alves * gdb.multi/tids.exp: Adjust expected output. Add "thread apply 1 foo --1" test. --- gdb/ChangeLog | 7 +++++++ gdb/testsuite/ChangeLog | 5 +++++ gdb/testsuite/gdb.multi/tids.exp | 16 ++++++++++++++-- gdb/thread.c | 15 ++++++--------- gdb/tid-parse.c | 10 +++++++++- 5 files changed, 41 insertions(+), 12 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index cd81cfea350..3843e12710b 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,10 @@ +2019-06-13 Pedro Alves + + * thread.c (thread_apply_command): Adjust TID parsing. + * tid-parse.c (tid_range_parser::finished): Ensure parsing end is + detected before end of string. + (tid_is_in_list): Error out if LIST is invalid. + 2019-06-13 Pedro Alves * completer.c (complete_line_internal_1): Rewind completion word diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 1a072660537..5590bf964d0 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2019-06-13 Pedro Alves + + * gdb.multi/tids.exp: Adjust expected output. Add "thread apply 1 + foo --1" test. + 2019-06-11 Bernhard Heckel * gdb.fortran/block-data.f: New. diff --git a/gdb/testsuite/gdb.multi/tids.exp b/gdb/testsuite/gdb.multi/tids.exp index 617a1b0299c..3b0e1c1860a 100644 --- a/gdb/testsuite/gdb.multi/tids.exp +++ b/gdb/testsuite/gdb.multi/tids.exp @@ -350,8 +350,13 @@ with_test_prefix "two inferiors" { thr_apply_info_thr_error "${prefix}1-" "inverted range" thr_apply_info_thr_error "${prefix}2-1" "inverted range" thr_apply_info_thr_error "${prefix}2-\$one" "inverted range" - thr_apply_info_thr_error "${prefix}-1" "negative value" - thr_apply_info_thr_error "${prefix}-\$one" "negative value" + if {$prefix == ""} { + thr_apply_info_thr_error "${prefix}-1" "Invalid thread ID: -1" + thr_apply_info_thr_error "${prefix}-\$one" "Invalid thread ID: -\\\$one" + } else { + thr_apply_info_thr_error "${prefix}-1" "negative value" + thr_apply_info_thr_error "${prefix}-\$one" "negative value" + } thr_apply_info_thr_error "${prefix}\$minus_one" \ "negative value: ${prefix_re}\\\$minus_one" @@ -374,6 +379,13 @@ with_test_prefix "two inferiors" { gdb_test "thread apply 1.*" $output } + # Check that thread ID list parsing stops at the non-number token + # "foo" in a corner case where the "foo" is followed by hyphens. + # In this corner case, GDB used to skip past "foo", and then parse + # "--1" as a tid range for the current inferior. + gdb_test "thread apply 1 foo --1" \ + "Undefined command: \"foo\". Try \"help\"\\." + # Check that we do parse the inferior number and don't confuse it. gdb_test "info threads 3.1" \ "No threads match '3.1'\." diff --git a/gdb/thread.c b/gdb/thread.c index 9a6a7735950..a84dbf9fa1e 100644 --- a/gdb/thread.c +++ b/gdb/thread.c @@ -1560,7 +1560,6 @@ thread_apply_command (const char *tidlist, int from_tty) { qcs_flags flags; const char *cmd = NULL; - const char *cmd_or_flags; tid_range_parser parser; if (tidlist == NULL || *tidlist == '\000') @@ -1572,17 +1571,15 @@ thread_apply_command (const char *tidlist, int from_tty) int inf_num, thr_start, thr_end; if (!parser.get_tid_range (&inf_num, &thr_start, &thr_end)) - { - cmd = parser.cur_tok (); - break; - } + break; } - cmd_or_flags = cmd; - while (cmd != NULL && parse_flags_qcs ("thread apply", &cmd, &flags)) + cmd = parser.cur_tok (); + + while (parse_flags_qcs ("thread apply", &cmd, &flags)) ; - if (cmd == NULL) + if (*cmd == '\0') error (_("Please specify a command following the thread ID list")); if (tidlist == cmd || !isalpha (cmd[0])) @@ -1591,7 +1588,7 @@ thread_apply_command (const char *tidlist, int from_tty) scoped_restore_current_thread restore_thread; parser.init (tidlist, current_inferior ()->num); - while (!parser.finished () && parser.cur_tok () < cmd_or_flags) + while (!parser.finished ()) { struct thread_info *tp = NULL; struct inferior *inf; diff --git a/gdb/tid-parse.c b/gdb/tid-parse.c index 828362ea94b..07d7d2c3b2a 100644 --- a/gdb/tid-parse.c +++ b/gdb/tid-parse.c @@ -139,7 +139,13 @@ tid_range_parser::finished () const switch (m_state) { case STATE_INFERIOR: - return *m_cur_tok == '\0'; + /* Parsing is finished when at end of string or null string, + or we are not in a range and not in front of an integer, negative + integer, convenience var or negative convenience var. */ + return (*m_cur_tok == '\0' + || !(isdigit (*m_cur_tok) + || *m_cur_tok == '$' + || *m_cur_tok == '*')); case STATE_THREAD_RANGE: case STATE_STAR_RANGE: return m_range_parser.finished (); @@ -311,6 +317,8 @@ tid_is_in_list (const char *list, int default_inferior, return 1; tid_range_parser parser (list, default_inferior); + if (parser.finished ()) + invalid_thread_id_error (parser.cur_tok ()); while (!parser.finished ()) { int tmp_inf, tmp_thr_start, tmp_thr_end; -- 2.30.2