Feature #15289
closedAccept "target" keyword on `TracePoint#enable`
Description
Abstract¶
To enable TracePoint for specific location, I propose new keyword argument target:
to TracePoint#enable
for specific events (line
, call
, return
, class
, end
).
Usage:
line_trace = TracePoint.new(:line){|tp|
p tp
}
def foo
p 1
end
line_trace.enable(target: method(:foo)) do
foo
end
In this case, a line trace is enable only on the method foo
.
target:
keyword accepts Method
, UnboundMethod
, Proc
and RubyVM::InstructionSequence
(ISeq for short) . All of objects can pull ISeq objects.
Further more, I propose target_lines:
keyword too, which specify effective line(s).
These features can improve "break point" feature and so on.
Background¶
If we want to insert break point in Ruby's source code, we can use TracePoint
(line event, for example). However, it enables all locations. It hurt performance.
This proposal overcomes this performance penalty.
Implementation¶
Now basic design are completed in my mind :p
Discussion¶
line or lines¶
For breakpoint purpose, we only need to specify a line. Specifying lines is needed?
no events on lines¶
It is not clear that if line is specified (for example: 10) and there are no line event (for example, empty line).
Possible options:
- (1) raise an exception
- (2) adjust before/after effective event
- (3) ignore
I prefer (1).
no events in Proc¶
Similar to last topic, if we specify call
event on Proc
object, there are no call
event. What happens?
recursive or not¶
If method foo
refers other blocks, I think we need to enable recursively.
how to get File target?¶
Sometimes we want to specify breakponit to the location specified by "file:line". How to get the lines?
https://github.com/ko1/iseq_collector provides the feature to collect all of ISeqs. debugger can collects all of them and debugger can filter with path name.
Also [Feature #15287] will help to hook not loaded locations.
enable
w/ keywords or other method name?
I have no strong opinion, but TracePoint#enable_on(target, lines: ...)
is another idea?
reference¶
Related: https://github.com/ruby/ruby/pull/2000
This implementation is based on trace_
insn.
Updated by shevegen (Robert A. Heiler) almost 6 years ago
Sounds nice. Please do not forget documentation when/if approved/added. :)
I have no particular opinion on the API/name(s) as such, but I would recommend
to try to keep it simple and "logical" if possible. A Hash would probably make
the most sense, and the names for the parameters should ideally be the same, e. g.
if "lines:" is used, to also keep the same names whenever possible (both for
TracePoint, but also perhaps elsewhere in ruby if that is necessary; a bit
like how recently :exception was added to Kernel#system and other methods
there, like in the news entry for the upcoming 2.6.x xmas-release.
That is not necessarily an endorsement of the name "lines:" as such, mind
you; just more a general comment.
(I think the name "lines:" may not always be ideal, e. g. in the cases where
a ruby user may only want to add one breakpoint to a single line - but this
is mostly a detail, IMO. I am sure any fitting name can be derived when we
have some examples of how this is used. Ideally a short name if possible.)
Updated by ko1 (Koichi Sasada) over 5 years ago
I got Matz's approval.
I'll implement it and commit soon before ruby 2.6 rc1.
Now, I finished most of features, except handling at exception.
Updated by ko1 (Koichi Sasada) over 5 years ago
- Status changed from Open to Closed
Applied in changeset trunk|r66003.
Support targetting TracePoint [Feature #15289]
-
vm_trace.c (rb_tracepoint_enable_for_target): support targetting
TracePoint. [Feature #15289]Tragetting TracePoint is only enabled on specified method, proc
and so on, example:tp.enable(target: code)
.code
should be consisted of InstructionSeuqnece (iseq)
(RubyVM::InstructionSeuqnece.of(code) should not return nil)
If code is a tree of iseq, TracePoint is enabled on all of
iseqs in a tree.Enabled tragetting TracePoints can not enabled again with
and without target. -
vm_core.h (rb_iseq_t): introduce
rb_iseq_t::local_hooks
to store local hooks.
rb_iseq_t::aux::trace_events
is renamed to
global_trace_events
to contrast withlocal_hooks
. -
vm_core.h (rb_hook_list_t): add
rb_hook_list_t::running
to represent how many Threads/Fibers are used this list.
If this field is 0, nobody using this hooks and we can
delete it.This is why we can remove code from cont.c.
-
vm_core.h (rb_vm_t): because of above change, we can eliminate
rb_vm_t::trace_running
field.
Also renamed fromrb_vm_t::event_hooks
toglobal_hooks
. -
vm_core.h, vm.c (ruby_vm_event_enabled_global_flags): renamed
from `ruby_vm_event_enabled_flags. -
vm_core.h, vm.c (ruby_vm_event_local_num): added to count
enabled targetting TracePoints. -
vm_core.h, vm_trace.c (rb_exec_event_hooks): accepts
hook list. -
vm_core.h (rb_vm_global_hooks): added for convinience.
-
method.h (rb_method_bmethod_t): added to maintain Proc
andrb_hook_list_t
for bmethod (defined by define_method). -
prelude.rb (TracePoint#enable): extracet a keyword parameter
(because it is easy than writing in C).
It callsTracePoint#__enable
internal method written in C. -
vm_insnhelper.c (vm_trace): check also iseq->local_hooks.
-
vm.c (invoke_bmethod): check def->body.bmethod.hooks.
-
vm.c (hook_before_rewind): check iseq->local_hooks
and def->body.bmethod.hooks before rewind by exception.
Updated by k0kubun (Takashi Kokubun) over 5 years ago
- Status changed from Closed to Assigned
I reopen this ticket as a reminder to fix MinGW test failure by this. Please close this ticket once AppVeyor becomes green with r66062 reverted.
Updated by k0kubun (Takashi Kokubun) over 5 years ago
- Status changed from Assigned to Closed
The above issue was fixed in r66087. Thank you.