gdb7 hooks for MRI
(c) 2009 Aman Gupta (tmm1)
=== Requirements
gdb.rb currently requires x86_64 linux, and MRI/REE 1.8.x or 1.9.2.
=== Usage
$ ps aux | grep deploy.rb
13074 0.0 0.7 90164 31720 ? R Sep23 2:21 /usr/bin/ruby /usr/bin/god -c deploy.rb
$ sudo gdb.rb 13074
GNU gdb (GDB) 7.0
Reading symbols from /usr/bin/ruby...done.
Attaching to program: /usr/bin/ruby, process 13074
0x00007fa8b9cb3c93 in select () from /lib/libc.so.6
(gdb) ruby eval 1+2
2
(gdb) ruby eval Thread.list.count
17
(gdb) ruby threads list
0x1589000 main thread THREAD_STOPPED WAIT_JOIN(0x19ef400) 4417 bytes
0x19ef400 thread THREAD_STOPPED WAIT_TIME(57.10) 6267 bytes
0x19e3400 thread THREAD_STOPPED WAIT_FD(5) 10405 bytes
0x19e0000 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19e0400 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19e0800 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19e0c00 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19de000 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19de400 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19de800 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19dec00 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19dc000 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19dc400 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19dc800 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x19dcc00 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x2266800 thread THREAD_STOPPED WAIT_NONE 14237 bytes
0x1d63000 curr thread THREAD_RUNNABLE WAIT_NONE
(gdb) ruby threads
0x1589000 main thread THREAD_STOPPED WAIT_JOIN(0x19ef400) 4417 bytes
node_call join in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:626
node_call start in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:633
node_call at_exit in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:666
node_fcall (unknown) in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/cli/run.rb:87
0x19ef400 thread THREAD_STOPPED WAIT_TIME(45.25) 6267 bytes
node_fcall sleep in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:622
node_fcall start in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:621
node_fcall loop in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:621
node_call start in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:620
node_call initialize in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:620
node_call new in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:620
node_call start in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:633
node_call at_exit in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god.rb:666
node_fcall (unknown) in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/cli/run.rb:87
0x19e3400 thread THREAD_STOPPED WAIT_FD(5) 10405 bytes
node_call accept in /usr/lib/ruby/1.8/drb/unix.rb:98
node_call accept in /usr/lib/ruby/1.8/drb/drb.rb:1581
node_vcall main_loop in /usr/lib/ruby/1.8/drb/drb.rb:1430
node_call run in /usr/lib/ruby/1.8/drb/drb.rb:1427
node_call start in /usr/lib/ruby/1.8/drb/drb.rb:1427
node_vcall run in /usr/lib/ruby/1.8/drb/drb.rb:1347
node_call initialize in /usr/lib/ruby/1.8/drb/drb.rb:1627
(gdb) ruby threads trace
-- Tracing thread context switches.
0x19ef400 thread THREAD_RUNNABLE WAIT_NONE 6267 bytes
0x1d63000 thread THREAD_RUNNABLE WAIT_NONE 8623 bytes
0x19e3400 thread THREAD_RUNNABLE WAIT_NONE 10405 bytes
0x3001c00 thread THREAD_RUNNABLE WAIT_NONE 9507 bytes
0x19e3400 thread THREAD_RUNNABLE WAIT_NONE 9507 bytes
0x3001c00 thread THREAD_RUNNABLE WAIT_NONE 15059 bytes
0x1d63000 thread THREAD_RUNNABLE WAIT_NONE 8623 bytes
0x3001c00 thread THREAD_RUNNABLE WAIT_NONE 15059 bytes
(gdb) ruby trace 25
-- Tracing the next 25 ruby method calls.
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
watching_pid? in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:58
[] in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
default in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
watching_pid? in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:58
[] in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
default in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
watching_pid? in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:58
[] in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
default in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
watching_pid? in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:58
[] in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
default in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:59
handle_events in /usr/lib/ruby/gems/1.8/gems/god-0.7.13/bin/../lib/god/event_handler.rb:66
(gdb) ruby objects
HEAPS 8
SLOTS 1686252
LIVE 893327 (52.98%)
FREE 792925 (47.02%)
bignum 2 (0.00%)
file 51 (0.01%)
float 77 (0.01%)
module 781 (0.09%)
varmap 1354 (0.15%)
scope 1641 (0.18%)
match 1676 (0.19%)
iclass 1744 (0.20%)
regexp 2255 (0.25%)
data 3539 (0.40%)
class 3680 (0.41%)
hash 6196 (0.69%)
object 8785 (0.98%)
array 13850 (1.55%)
string 105350 (11.79%)
node 742346 (83.10%)
(gdb) ruby objects classes
1 YAML::Syck::Resolver
1 YAML::Syck::Resolver
1 SystemStackError
1 Object
1 Object
1 NoMemoryError
1 fatal
1 Object
1 Gem::SourceIndex
1 Gem::GemPathSearcher
1 Gem::ConfigFile
1 God::Logger
1 God::SimpleLogger
1 God::CLI::Run
1 DRb::DRbServer::InvokeMethod
1 DRb::DRbServer
1 DRb::DRbIdConv
1 God::Registry
1 OptionParser::Switch::OptionalArgument
1 OptionParser
1 God::Socket
1 God::Contacts::Email
2 Date::Infinity
2 DRb::DRbMessage
2 DRb::DRbBadScheme
2 DRb::DRbUNIXSocket
3 OptionParser::List
6 IOError
6 Errno::ESRCH
6 OptionParser::Switch::RequiredArgument
6 Net::InternetMessageIO
7 God::System::SlashProcPoller
7 God::System::Process
7 God::DriverOperation
7 Net::SMTP
8 StandardError
10 OptionParser::Switch::NoArgument
13 God::Conditions::Flapping
13 God::Conditions::ProcessExits
13 God::Behaviors::CleanPidFile
13 God::Process
13 God::Watch
13 God::Driver
13 God::DriverEventQueue
19 God::DriverEvent
38 Process::Status
39 God::Conditions::ProcessRunning
50 Range
63 Gem::Specification
65 God::Metric
81 Gem::Dependency
174 Gem::Version::Part
209 Gem::Requirement
219 Gem::Version
(gdb) ruby objects strings
70 u'bin'
73 u' INFO'
74 u'--main'
74 u'I'
75 u'..'
78 u'ruby'
80 u'::'
92 u'1.3.2'
100 u'README.rdoc'
102 u' '
108 u'Rakefile'
110 u'README'
114 u'\r\n'
127 u'>='
140 u'lib'
158 u'0'
294 u'\n'
619 u''
30503 unique strings
3187435 bytes
(gdb) ruby objects nodes
8156 NODE_EVSTR
8966 NODE_COLON2
10020 NODE_DVAR
11493 NODE_AND
13157 NODE_FCALL
14493 NODE_VCALL
15148 NODE_ARGS
15180 NODE_CONST
15445 NODE_SCOPE
16582 NODE_IF
21594 NODE_LASGN
22084 NODE_METHOD
26633 NODE_STR
37819 NODE_LIT
64325 NODE_LVAR
64470 NODE_NEWLINE
69436 NODE_BLOCK
85825 NODE_CALL
126739 NODE_ARRAY
=== TODO
`ruby where` for the current stack trace
`ruby print` to inspect ruby variables
`ruby breakpoint` to breakpoint on ruby methods
`ruby irb` for a simple interactive shell
=== Credits
Tom Tromey for his work on gdb python support (gdb-eval.patch, gdb-breakpoints.patch) and help
tracking down some memory leaks (gdb-leak.patch)
Joe Damato for writing parts of ruby-gdb.py and various gdb hacks to make gdb.rb possible.
=== License
Available under the Ruby License.
Project
gdb.rb
A set of gdb7 extensions for the MRI/REE 1.8.x interpreter (and basic support for YARV 1.9.2)
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