YJIT: implement variable-length context encoding scheme (#10888)

* Implement BitVector data structure for variable-length context encoding

* Rename method to make intent clearer

* Rename write_uint => push_uint to make intent clearer

* Implement debug trait for BitVector

* Fix bug in BitVector::read_uint_at(), enable more tests

* Add one more test for good measure

* Start sketching Context::encode()

* Progress on variable length context encoding

* Add tests. Fix bug.

* Encode stack state

* Add comments. Try to estimate context encoding size.

* More compact encoding for stack size

* Commit before rebase

* Change Context::encode() to take a BitVector as input

* Refactor BitVector::read_uint(), add helper read functions

* Implement Context::decode() function. Add test.

* Fix bug, add tests

* Rename methods

* Add Context::encode() and decode() methods using global data

* Make encode and decode methods use u32 indices

* Refactor YJIT to use variable-length context encoding

* Tag functions as allow unused

* Add a simple caching mechanism and stats for bytes per context etc

* Add comments, fix formatting

* Grow vector of bytes by 1.2x instead of 2x

* Add debug assert to check round-trip encoding-decoding

* Take some rustfmt formatting

* Add decoded_from field to Context to reuse previous encodings

* Remove olde context stats

* Re-add stack_size assert

* Disable decoded_from optimization for now

1 files changed, 1 insertions, 1 deletions

diff --git a/yjit.c b/yjit.c
index d40ac81fb5..9f68e363ef 100644
--- a/yjit.c
+++ b/yjit.c
@@ -1245,7 +1245,7 @@ rb_yjit_set_exception_return(rb_control_frame_t *cfp, void *leave_exit, void *le
 VALUE rb_yjit_stats_enabled_p(rb_execution_context_t *ec, VALUE self);
 VALUE rb_yjit_print_stats_p(rb_execution_context_t *ec, VALUE self);
 VALUE rb_yjit_trace_exit_locations_enabled_p(rb_execution_context_t *ec, VALUE self);
-VALUE rb_yjit_get_stats(rb_execution_context_t *ec, VALUE self, VALUE context);
+VALUE rb_yjit_get_stats(rb_execution_context_t *ec, VALUE self);
 VALUE rb_yjit_reset_stats_bang(rb_execution_context_t *ec, VALUE self);
 VALUE rb_yjit_disasm_iseq(rb_execution_context_t *ec, VALUE self, VALUE iseq);
 VALUE rb_yjit_insns_compiled(rb_execution_context_t *ec, VALUE self, VALUE iseq);