This change fixes `-v --yjit-stats`. Previously in this situation,
YJIT._print_stats wasn't defined as yjit.rb is not evaluated when there
is only "-v" and no Ruby code to run.
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?
YJIT expects the VM to invalidate opt_getinlinecache when updating the
constant cache, and the invalidation used to happen even when YJIT can't
use the cached value.
Once the first invalidation happens, the block for opt_getinlinecache
becomes a stub. When the stub is hit, YJIT fails to compile the
instruction as the cache is not usable. The stub becomes a block that
exits for opt_getinlinecache which can be invalidated again. Some
workloads that bust the interpreter's constant cache can create an
invalidation loop with this behavior.
Check if the cache is usable become doing invalidation to fix this
problem.
In the test harness, evaluate the test script in a lambda instead of a
proc so `return` doesn't return out of the harness.
For use cases where you want to collect the metrics
for a specific piece of code (typically a web request)
you can have the stats turned off by default and then
turn them on at runtime before executing the code you care
about.
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.
RUBY_DEBUG have a very significant performance overhead. Enough that
YJIT with RUBY_DEBUG is noticeably slower than the interpreter without
RUBY_DEBUG.
This makes it hard to collect yjit-stats in production environments.
By allowing to collect JIT statistics without the RUBy_DEBUG overhead,
I hope to make such use cases smoother.
If `--disable-jit-support` is passed to configure, then `jit_func` is
removed from the iseq body and we can't compile YJIT. This commit
detects when the JIT function pointer is gone and disables YJIT in that
case.
Always using `ret` to return to the interpreter means that we never have
to check the VM_FRAME_FLAG_FINISH flag.
In the case that we return `Qundef`, the interpreter will execute the
cfp. We can take advantage of this by setting the PC to the instruction
we can't handle, and let the interpreter pick up the ball from there.
If we return a value other than Qundef, the interpreter will take that
value as the "return value" from the JIT and push that to the SP of the
caller
The leave instruction puts the return value on the top of the calling
frame's stack. YJIT does the same thing for leave instructions.
However, when we're returning back to the interpreter, the leave
instruction _should not_ put the return value on the top of the stack,
but put it in RAX and use RET. This commit pops the last value from the
stack pointer and puts it in RAX so that the interpreter is happy with
SP.
This adds a method to blocks to get outgoing ids, then uses the outgoing
ids to generate a graphviz graph. Two methods were added to the Block
object. One method returns an id for the block, which is just the
address of the underlying block. The other method returns a list of
outgoing block ids. We can use Block#id in conjunction with
Block#outgoing_ids to construct a graph of blocks
* Use builtin_inline_p to skip a frame of C methods
* Fix bugs in primitive cfunc call code
* Remove if (push_frame) {}
* Remove if (push_frame) {}
* Push Aaron's fix to avoid hardcoding insn lengths
Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>
* Implement send with blocks
Not that much extra work compared to `opt_send_without_block`.
Moved the stack over flow check because it could've exited after changes
are made to cfp.
* rename oswb counters
* Might as well implement sending block to cfuncs
* Disable sending blocks to cfuncs for now
* Reconstruct interpreter sp before calling into cfuncs
In case the callee cfunc calls a method or delegates to a block.
This also has the side benefit of letting call sites that sometimes are
iseq calls and sometimes cfunc call share the same successor.
* only sync with interpreter sp when passing a block
Co-authored-by: Maxime Chevalier-Boisvert <maximechevalierb@gmail.com>
Co-authored-by: Aaron Patterson <aaron.patterson@shopify.com>
* Use INT32_MIN, INT32_MAX, etc. constants in yjit_asm.c
* Print warning on stderr when code past rel32 jump range
* Fix preprocessor snafu
* Move rel32 warning into --yjit-stats
* Try to allocate within rel32 offset on Linux machines
* Update yjit_asm.c
Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>
* On Linux, use sysconf to get the page size
Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>
This commit fixes a build error. If we build in release mode (IOW
*without* RUBY_DEBUG), then this constant isn't defined. Release mode
builds are required by yjit-bench
Alan Wu
Noah Gibbs
Maxime Chevalier-Boisvert
John Hawthorn
Jean Boussier
Aaron Patterson
Maxime Chevalier-Boisvert