If the iseq only contains `opt_invokebuiltin_delegate_leave` insn and
the builtin-function (bf) is inline-able, the caller doesn't need to
build a method frame.
`vm_call_single_noarg_inline_builtin` is fast path for such cases.
Right now the attached object is stored as an instance variable
and all the call sites that either get or set it have to know how it's
stored.
It's preferable to hide this implementation detail behind accessors
so that it is easier to change how it's stored.
trace_arg->id is the ID of the original method of an aliased method. If
the original method is removed, then the lookup will fail. We should use
trace_arg->called_id instead, which is the ID of the aliased method.
Fixes [Bug #19305]
I noticed this while running test_yjit with --mjit-call-threshold=1,
which redefines `Integer#<`. When Ruby is monkey-patched,
MJIT itself could be broken.
Similarly, Ruby scripts could break MJIT in many different ways. I
prepared the same set of hooks as YJIT so that we could possibly
override it and disable it on those moments. Every constant under
RubyVM::MJIT is private and thus it's an unsupported behavior though.
Follow-up for 2b8191bdad. Since that
commit, we stopped doing code invalidation the second time the call and
return events are enabled. We need to do it every time these events are
enabled because we might have generated code while these events are
disabled.
Also rename locals and edit comments to make it more clear that the iseq
rewrite code path only happens the first time a particular iseq trace
event is enabled.
Previously, we didn't pop the frame that runs the TracePoint hook for
b_return events for blocks running as methods (bmethods). In case the
hook raises, that formed an infinite loop during stack unwinding in
hook_before_rewind().
[Bug #18060]
df317151a5 removed the code to free
rb_hook_list_t, so repeated targeting of the same bmethod started
to leak the hook list. You can observe how the maximum memory use
scales with input size in the following script with `/usr/bin/time -v`.
```ruby
o = Object.new
o.define_singleton_method(:foo) {}
trace = TracePoint.new(:return) {}
bmethod = o.method(:foo)
ARGV.first.to_i.times { trace.enable(target:bmethod){} }
4.times {GC.start}
```
After this change the maximum doesn't grow as quickly.
To plug the leak, check whether the hook list is already allocated
when enabling the targeting TracePoint for the bmethod. This fix
also allows multiple TracePoints to target the same bmethod, similar
to other valid TracePoint targets.
Finally, free the rb_hook_list_t struct when freeing the method
definition it lives on. Freeing in the GC is a good way to avoid
lifetime problems similar to the one fixed in df31715.
[Bug #18031]
Check whether the current or previous frame is a Ruby frame in
call_trace_func and rb_tracearg_binding before attempting to
create a binding for the frame.
Fixes [Bug #18487]
Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>
This is more backwards compatible, and should fix issues with
power_assert.
Unfortunately, it requires using a sentinel value as the default
value of target_thread, instead of the more natural expression
used in the original approach.
Check whether the current or previous frame is a Ruby frame in
call_trace_func before attempting to create a binding for the frame.
Fixes [Bug #18487]
Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>
Currently the calculation only counts the size of the struct. This commit adds the size of the associated st tables, id tables, and linked lists.
Still missing is the size of the ractors and (potentially) the size of the object space.
It free `rb_hook_list_t` itself if needed. To recognize the
need, this patch introduced `rb_hook_list_t::is_local` flag.
This patch is succession of https://github.com/ruby/ruby/pull/4652
In general, while TracePoint callback is running,
other registerred callbacks are not called to avoid
confusion by reentrace.
This method allow the reentrace. This method should be
used carefully, otherwize the callback can be easily called
infinitely.
[Feature #15912]
Co-authored-by: Jean Boussier <jean.boussier@gmail.com>
The main impetus for this change is to fix [Bug #13392]. Previously, we
fired the "return" TracePoint event after popping the stack frame for
the block running as method (BMETHOD). This gave undesirable source
location outputs as the return event normally fires right before the
frame going away.
The iseq for each block can run both as a block and as a method. To
accommodate that, this commit makes vm_trace() fire call/return events for
instructions that have b_call/b_return events attached when the iseq is
running as a BMETHOD. The logic for rewriting to "trace_*" instruction
is tweaked so that when the user listens to call/return events,
instructions with b_call/b_return become trace variants.
To continue to provide the return value for non-local returns done using
the "return" or "break" keyword inside BMETHODs, the stack unwinding
code is tweaked. b_return events now provide the same return value as
return events for these non-local cases. A pre-existing test deemed not
providing a return value for these b_return events as a limitation.
This commit removes the checks for call/return TracePoint events that
happen when calling into BMETHODs when no TracePoints are active.
Technically, migrating just the return event is enough to fix the bug,
but migrating both call and return removes our reliance on
`VM_FRAME_FLAG_FINISH` and re-entering the interpreter when the caller
is already in the interpreter.
After 5680c38c75, postponed job APIs now
expect to be called on native threads not managed by Ruby and handles
getting a NULL execution context. However, in debug builds the change
runs into an assertion failure with GET_EC() which asserts that EC is
non-NULL. Avoid the assertion failure by passing `false` for `expect_ec`
instead as the intention is to handle when there is no EC.
Add a test from John Crepezzi and John Hawthorn to exercise this
situation.
See GH-4108
See GH-5094
[Bug #17573]
Co-authored-by: John Hawthorn <john@hawthorn.email>
Co-authored-by: John Crepezzi <john.crepezzi@gmail.com>
For upstreaming, we want functions we export either prefixed with "rb_"
or made static. Historically we haven't been following this rule, so we
were "leaking" a lot of symbols as `make leak-globals` would tell us.
This change unifies everything YJIT into a single compilation unit,
yjit.o, and makes everything unprefixed static to pass `make leak-globals`.
This manual "unified build" setup is similar to that of vm.o.
Having everything in one compilation unit allows static functions to
be visible across YJIT files and removes the need for declarations in
headers in some cases. Unnecessary declarations were removed.
Other changes of note:
- switched to MJIT_SYMBOL_EXPORT_BEGIN which indicates stuff as being
off limits for native extensions
- the first include of each YJIT file is change to be "internal.h"
- undefined MAP_STACK before explicitly redefining it since it
collide's with a definition in system headers. Consider renaming?
This change fixes some cases where YJIT fails to fire tracing events.
Most of the situations YJIT did not handle correctly involves enabling
tracing while running inside generated code.
A new operation to invalidate all generated code is added, which uses
patching to make generated code exit at the next VM instruction
boundary. A new routine called `jit_prepare_routine_call()` is
introduced to facilitate this and should be used when generating code
that could allocate, or could otherwise use `RB_VM_LOCK_ENTER()`.
The `c_return` event is fired in the middle of an instruction as opposed
to at an instruction boundary, so it requires special handling. C method
call return points are patched to go to a fucntion which does everything
the interpreter does, including firing the `c_return` event. The
generated code for C method calls normally does not fire the event.
Invalided code should not change after patching so the exits are not
clobbered. A new variable is introduced to track the region of code that
should not change.
In vm_call_method_each_type, check for c_call and c_return events before
dispatching to vm_call_ivar and vm_call_attrset. With this approach, the
call cache will still dispatch directly to those functions, so this
change will only decrease performance for the first (uncached) call, and
even then, the performance decrease is very minimal.
This approach requires that we clear the call caches when tracing is
enabled or disabled. The approach currently switches all vm_call_ivar
and vm_call_attrset call caches to vm_call_general any time tracing is
enabled or disabled. So it could theoretically result in a slowdown for
code that constantly enables or disables tracing.
This approach does not handle targeted tracepoints, but from my testing,
c_call and c_return events are not supported for targeted tracepoints,
so that shouldn't matter.
This includes a benchmark showing the performance decrease is minimal
if detectable at all.
Fixes [Bug #16383]
Fixes [Bug #10470]
Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>
iff means if and only if, but readers without that knowledge might
assume this to be a spelling mistake. To me, this seems like
exclusionary language that is unnecessary. Simply using "if and only if"
instead should suffice.
separate some fields from rb_ractor_t to rb_ractor_pub and put it
at the beggining of rb_ractor_t and declare it in vm_core.h so
vm_core.h can access rb_ractor_pub fields.
Now rb_ec_ractor_hooks() is a complete inline function and no
MJIT related issue.
This commit introduces Ractor mechanism to run Ruby program in
parallel. See doc/ractor.md for more details about Ractor.
See ticket [Feature #17100] to see the implementation details
and discussions.
[Feature #17100]
This commit does not complete the implementation. You can find
many bugs on using Ractor. Also the specification will be changed
so that this feature is experimental. You will see a warning when
you make the first Ractor with `Ractor.new`.
I hope this feature can help programmers from thread-safety issues.
* Fix debug documents to match Thread#to_s change (Feature #16412 ticket)
* TracePoint#inspect returns "... file:line" (Feature #16513)
* Guard older version of Ruby in Tracepoint inspection tests
* Focus on current thread only when running TracePoint inspection test
Nobuyoshi Nakada
Koichi Sasada
Takashi Kokubun
Jean Boussier
Peter Zhu
Jeremy Evans
S-H-GAMELINKS
Alan Wu
Kazuhiro NISHIYAMA
Kevin Newton
卜部昌平
Gannon McGibbon
Nguyễn Quang Minh