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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.
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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.
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* Implement eager versioning. Refactor versioning logic.
* Add --version-limit and --greedy-versioning command-line args
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Make sure `opt_getinlinecache` is in a block all on its own, and
invalidate it from the interpreter when `opt_setinlinecache`.
It will recompile with a filled cache the second time around.
This lets YJIT runs well when the IC for constant is cold.
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This commit collects statistics about how many binding objects are
allocated as well as the number of local variables set on bindings.
Statistics are output along with other YJIT stats. Here is an example
of the output:
```
***YJIT: Printing runtime counters from yjit.rb***
Number of Bindings Allocated: 195
Number of locals modified through binding: 0
opt_send_without_block exit reasons:
ivar_get_method 7515891 (40.4%)
se_cc_klass_differ 3081330 (16.6%)
iseq_argc_mismatch 1564578 ( 8.4%)
se_receiver_not_heap 1557663 ( 8.4%)
ic_empty 1407064 ( 7.6%)
optimized_method 995823 ( 5.4%)
iseq_not_simple 819413 ( 4.4%)
alias_method 706972 ( 3.8%)
bmethod 685253 ( 3.7%)
callsite_not_simple 225983 ( 1.2%)
kw_splat 25999 ( 0.1%)
ivar_set_method 902 ( 0.0%)
cfunc_toomany_args 394 ( 0.0%)
refined_method 42 ( 0.0%)
cfunc_ruby_array_varg 29 ( 0.0%)
invalid_cme 4 ( 0.0%)
leave exit reasons:
se_finish_frame 4067107 (100.0%)
se_interrupt 24 ( 0.0%)
getinstancevariable exit reasons:
undef 121177 (100.0%)
idx_out_of_range 5 ( 0.0%)
opt_aref exit reasons:
(all relevant counters are zero)
compiled_iseq_count: 3944
main_block_code_size: 1.1 MiB
side_block_code_size: 0.6 MiB
vm_insns_count: 1137268516
yjit_exec_insns_count: 414015644
ratio_in_yjit: 26.7%
avg_len_in_yjit: 7.5
total_exit_count: 55491789
most frequent exit op:
opt_send_without_block: 18587628 (33.5%)
opt_getinlinecache: 11075822 (20.0%)
send: 4949300 (8.9%)
leave: 4067131 (7.3%)
defined: 3975196 (7.2%)
setinstancevariable: 3567315 (6.4%)
invokesuper: 2982163 (5.4%)
getblockparamproxy: 2168852 (3.9%)
opt_nil_p: 2104524 (3.8%)
opt_aref: 2013858 (3.6%)
```
Running RailsBench allocates 195 binding objects but doesn't set any
local variables.
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Renaming uJIT to YJIT. AKA s/ujit/yjit/g.
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