From 8f9929bb97dc0f0fdf60269ac8c9a7d50746646f Mon Sep 17 00:00:00 2001 From: Gareth Rees Date: Sat, 26 Sep 2020 11:01:45 -0700 Subject: [PATCH] gdb: Fix from_tty argument to gdb.execute in Python. Prior to commit 56bcdbea2b, the from_tty keyword argument to the Python function gdb.execute controlled whether the command took input from the terminal. When from_tty=True, "starti" and similar commands prompted the user: (gdb) python gdb.execute("starti", from_tty=True) The program being debugged has been started already. Start it from the beginning? (y or n) y Starting program: /bin/true Program stopped. When from_tty=False, these commands did not prompt the user, and "yes" was assumed: (gdb) python gdb.execute("starti", from_tty=False) Program stopped. However, after commit 56bcdbea2b, the from_tty keyword argument no longer had this effect. For example, as of commit 7ade7fba75: (gdb) python gdb.execute("starti", from_tty=True) The program being debugged has been started already. Start it from the beginning? (y or n) [answered Y; input not from terminal] Starting program: /bin/true Program stopped. Note the "[answered Y; input not from terminal]" in the output even though from_tty=True was requested. Looking at commit 56bcdbea2b, it seems that the behaviour of the from_tty argument was changed accidentally. The commit message said: Let gdb.execute handle multi-line commands This changes the Python API so that gdb.execute can now handle multi-line commands, like "commands" or "define". and there was no mention of changing the effect of the from_tty argument. It looks as though the code for setting the instream to nullptr was accidentally moved from execute_user_command() to execute_control_commands() along with the other scoped restores. Accordingly, the simplest way to fix this is to partially reverse commit 56bcdbea2b by moving the code for setting the instream to nullptr back to execute_user_command() where it was to begin with. Additionally, add a test case to reduce the risk of similar breakage in future. gdb/ChangeLog: PR python/26586 * cli/cli-script.c (execute_control_commands): don't set instream to nullptr here as this breaks the from_tty argument to gdb.execute in Python. (execute_user_command): set instream to nullptr here instead. gdb/testsuite/ChangeLog: PR python/26586 * gdb.python/python.exp: add test cases for the from_tty argument to gdb.execute. --- gdb/ChangeLog | 8 ++++++++ gdb/cli/cli-script.c | 9 +++++---- gdb/testsuite/ChangeLog | 6 ++++++ gdb/testsuite/gdb.python/python.exp | 13 +++++++++++++ 4 files changed, 32 insertions(+), 4 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 86a841de9d..b60312c63a 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,11 @@ +2020-09-26 Gareth Rees (tiny change) + + PR python/26586 + * cli/cli-script.c (execute_control_commands): don't set + instream to nullptr here as this breaks the from_tty argument + to gdb.execute in Python. + (execute_user_command): set instream to nullptr here instead. + 2020-09-25 Simon Marchi * infrun.h (infrun_debug_printf): Fix formatting. diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c index da4a41023a..f8ac610d4d 100644 --- a/gdb/cli/cli-script.c +++ b/gdb/cli/cli-script.c @@ -392,10 +392,6 @@ execute_cmd_post_hook (struct cmd_list_element *c) void execute_control_commands (struct command_line *cmdlines, int from_tty) { - /* Set the instream to 0, indicating execution of a - user-defined function. */ - scoped_restore restore_instream - = make_scoped_restore (¤t_ui->instream, nullptr); scoped_restore save_async = make_scoped_restore (¤t_ui->async, 0); scoped_restore save_nesting = make_scoped_restore (&command_nest_depth, command_nest_depth + 1); @@ -464,6 +460,11 @@ execute_user_command (struct cmd_list_element *c, const char *args) if (user_args_stack.size () > max_user_call_depth) error (_("Max user call depth exceeded -- command aborted.")); + /* Set the instream to nullptr, indicating execution of a + user-defined function. */ + scoped_restore restore_instream + = make_scoped_restore (¤t_ui->instream, nullptr); + execute_control_commands (cmdlines, 0); } diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 2e35f6cdf1..248f039c02 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2020-09-26 Gareth Rees (tiny change) + + PR python/26586 + * gdb.python/python.exp: add test cases for the from_tty + argument to gdb.execute. + 2020-09-25 Gary Benson * gdb.base/infcall-nested-structs.exp.tcl: Add diff --git a/gdb/testsuite/gdb.python/python.exp b/gdb/testsuite/gdb.python/python.exp index a031ea5a18..017f33afe5 100644 --- a/gdb/testsuite/gdb.python/python.exp +++ b/gdb/testsuite/gdb.python/python.exp @@ -526,3 +526,16 @@ gdb_test "print \$cvar3" "= void" \ # Test PR 23669, the following would invoke the "commands" command instead of # "show commands". gdb_test "python gdb.execute(\"show commands\")" "$decimal print \\\$cvar3.*" + +# Test that the from_tty argument to gdb.execute is effective. If +# False, the user is not prompted for decisions such as restarting the +# program, and "yes" is assumed. If True, the user is prompted. +gdb_test "python gdb.execute('starti', from_tty=False)" \ + "Program stopped.*" \ + "starti via gdb.execute, not from tty" +gdb_test_multiple "python gdb.execute('starti', from_tty=True)" \ + "starti via gdb.execute, from tty" { + -re {The program being debugged has been started already\.\r\nStart it from the beginning\? \(y or n\) $} { + gdb_test "y" "Starting program:.*" "starti via interactive input" + } +} -- 2.34.1