From 717cf30c8230bcf1c7cc55353645bfc268a711d0 Mon Sep 17 00:00:00 2001 From: Anders Granlund Date: Thu, 22 Jan 2015 14:33:04 -0500 Subject: [PATCH] Introduce gdb_interact in testsuite gdb_interact is a small utility that we have found quite useful to debug test cases. Putting gdb_interact in a test suspends it and allows to interact with gdb to inspect whatever you want. You can then type ">>>" to resume the test execution. Of course, this is only for gdb devs. It wouldn't make sense to leave a gdb_interact permanently in a test case. When starting the interaction with the user, the script prints this banner: +------------------------------------------+ | Script interrupted, you can now interact | | with by gdb. Type >>> to continue. | +------------------------------------------+ Notes: * When gdb is launched, the gdb_spawn_id variable (lib/gdb.exp) is assigned -1. Given the name, I would expect it to contain the gdb expect spawn id, which is needed for interact. I changed all places that set gdb_spawn_id to -1 to set it to the actual gdb spawn id instead. * When entering the "interact" mode, the last (gdb) prompt is already eaten by expect, so it doesn't show up on the terminal. Subsequent prompts do appear though. We tried to print "(gdb)" just before the interact to replace it. However, it could be misleading if you are debugging an MI test case, it makes you think that you are typing in a CLI prompt, when in reality it's MI. In the end I decided that since the feature is for developers who know what they're doing and that one is normally consciously using gdb_interact, the script doesn't need to babysit the user. * There are probably some quirks depending on where in the script gdb_interact appears (e.g. it could interfere with following commands and make them fail), but it works for most cases. Quirks can always be fixed later. The idea and original implementation was contributed by Anders Granlund, a colleague of mine. Thanks to him. gdb/testsuite/ChangeLog: * gdb.base/statistics.exp: Assign spawn id to gdb_spawn_id. * gdb.base/valgrind-db-attach.exp: Same. * gdb.base/valgrind-infcall.exp: Same. * lib/mi-support.exp (default_mi_gdb_start): Same. * lib/prompt.exp (default_prompt_gdb_start): Same. * lib/gdb.exp (default_gdb_spawn): Same. (gdb_interact): New. --- gdb/testsuite/ChangeLog | 12 +++++++++++ gdb/testsuite/gdb.base/statistics.exp | 2 +- gdb/testsuite/gdb.base/valgrind-db-attach.exp | 2 +- gdb/testsuite/gdb.base/valgrind-infcall.exp | 2 +- gdb/testsuite/lib/gdb.exp | 21 ++++++++++++++++++- gdb/testsuite/lib/mi-support.exp | 2 +- gdb/testsuite/lib/prompt.exp | 2 +- 7 files changed, 37 insertions(+), 6 deletions(-) diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index b01a4c9eb32..faf84932089 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,15 @@ +2015-01-22 Anders Granlund + Simon Marchi + + * gdb.base/statistics.exp: Assign spawn id to gdb_spawn_id. + * gdb.base/valgrind-db-attach.exp: Same. + * gdb.base/valgrind-infcall.exp: Same. + * lib/mi-support.exp (default_mi_gdb_start): Same. + * lib/prompt.exp (default_prompt_gdb_start): Same. + * lib/gdb.exp (default_gdb_spawn): Same. + (gdb_interact): New. + + 2015-01-22 Jan Kratochvil * gdb.compile/compile.exp (pointer to jit function): New test. diff --git a/gdb/testsuite/gdb.base/statistics.exp b/gdb/testsuite/gdb.base/statistics.exp index bbb0a694142..dcdf5c5c98f 100644 --- a/gdb/testsuite/gdb.base/statistics.exp +++ b/gdb/testsuite/gdb.base/statistics.exp @@ -24,6 +24,6 @@ if { $res < 0 || $res == "" } { perror "Spawning $GDB failed." return } -set gdb_spawn_id -1 +set gdb_spawn_id $res gdb_test "" "Startup time: \[0-9.\]+ \\(cpu\\), \[0-9.\]+ \\(wall\\)\r\nSpace used: \[0-9.\]+ \\(\\+\[0-9.\]+ during startup\\)" "startup time and space" gdb_exit diff --git a/gdb/testsuite/gdb.base/valgrind-db-attach.exp b/gdb/testsuite/gdb.base/valgrind-db-attach.exp index 3055d19c9fa..89db22c8eb9 100644 --- a/gdb/testsuite/gdb.base/valgrind-db-attach.exp +++ b/gdb/testsuite/gdb.base/valgrind-db-attach.exp @@ -41,7 +41,7 @@ if { $res < 0 || $res == "" } { } pass $test # Declare GDB now as running. -set gdb_spawn_id -1 +set gdb_spawn_id $res # GDB spawned by `valgrind --db-attach=yes' stops already after the startup is # executed, like with non-extended gdbserver. It is also not correct to diff --git a/gdb/testsuite/gdb.base/valgrind-infcall.exp b/gdb/testsuite/gdb.base/valgrind-infcall.exp index ad81e91ce9d..3d3fdd3c587 100644 --- a/gdb/testsuite/gdb.base/valgrind-infcall.exp +++ b/gdb/testsuite/gdb.base/valgrind-infcall.exp @@ -33,7 +33,7 @@ if { $res < 0 || $res == "" } { } pass $test # Declare GDB now as running. -set gdb_spawn_id -1 +set gdb_spawn_id $res # GDB started by vgdb stops already after the startup is executed, like with # non-extended gdbserver. It is also not correct to run/attach the inferior. diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp index d3a3350a253..a6f200fa215 100644 --- a/gdb/testsuite/lib/gdb.exp +++ b/gdb/testsuite/lib/gdb.exp @@ -1444,7 +1444,8 @@ proc default_gdb_spawn { } { perror "Spawning $GDB failed." return 1 } - set gdb_spawn_id -1 + + set gdb_spawn_id $res return 0 } @@ -1516,6 +1517,24 @@ proc default_gdb_start { } { return 0 } +# Utility procedure to give user control of the gdb prompt in a script. It is +# meant to be used for debugging test cases, and should not be left in the +# test cases code. + +proc gdb_interact { } { + global gdb_spawn_id + set spawn_id $gdb_spawn_id + + send_user "+------------------------------------------+\n" + send_user "| Script interrupted, you can now interact |\n" + send_user "| with by gdb. Type >>> to continue. |\n" + send_user "+------------------------------------------+\n" + + interact { + ">>>" return + } +} + # Examine the output of compilation to determine whether compilation # failed or not. If it failed determine whether it is due to missing # compiler or due to compiler error. Report pass, fail or unsupported diff --git a/gdb/testsuite/lib/mi-support.exp b/gdb/testsuite/lib/mi-support.exp index f1b9c2b6ee3..20546f64bef 100644 --- a/gdb/testsuite/lib/mi-support.exp +++ b/gdb/testsuite/lib/mi-support.exp @@ -191,7 +191,7 @@ proc default_mi_gdb_start { args } { return -1 } } - set gdb_spawn_id -1 + set gdb_spawn_id $res # FIXME: mi output does not go through pagers, so these can be removed. # force the height to "unlimited", so no pagers get used diff --git a/gdb/testsuite/lib/prompt.exp b/gdb/testsuite/lib/prompt.exp index 198252476ac..a9696a44505 100644 --- a/gdb/testsuite/lib/prompt.exp +++ b/gdb/testsuite/lib/prompt.exp @@ -78,7 +78,7 @@ proc default_prompt_gdb_start { } { return -1 } } - set gdb_spawn_id -1 + set gdb_spawn_id $res return 0 } -- 2.30.2