gdbruby.rb

Overview

gdbruby.rb can output these information with live process or core.

• environment variables
• C stacktrace
• Ruby backtrace

This is Ruby port of gdbperl.pl made by Akira Higuchi.

Precondition

• Your Ruby executable must have debug symbol.
• on Linux.

Usage

With live process(process id: 24113)

$ gdbruby.rb 24113

With core file. You have to specify path of ruby executable.

$ gdbruby.rb core.24113 `rbenv which ruby`

You can get core file with gcore script or execute gcore command on gdb like below.

$ gdb
(gdb) attach 24113
(gdb) gcore core.24113
(gdb) detach

Options

You can specify options. 0 is interprited as false.

$ gdbruby.rb 24113 verbose_gdb=1 c_trace=1

• verbose_gdb: Show request and response to/from gdb(default: false)
• env: Show environment variables(default: true)
• c_trace: Show C stacktrace(default:true)

ToDo

• Print all Ruby threads
• Print arguments on Ruby backtrace
• Speeding up Ruby's type check
• List Ruby objects
• Check memory usage

FAQ

Why don't you call functions such like rb_vm_get_sourceline()

If you use gdbruby.rb with live process, gdb can call these functions. But if you use gdbruby.rb with core file, gdb cannot call c functions. So I re-implement these functions.

Which version does it support?

Ruby 2.0, 2.1 only.