Runtime counters for bailing from opt_send_without_block

This allows counting things in generated code such as side exits or
different reasons for failing to compile. Runtime counters are exposed
to Ruby as `UJIT.runtime_stats` for ease of reporting and analysis.

1 files changed, 6 insertions, 0 deletions

diff --git a/ujit_asm.c b/ujit_asm.c
index 6b85b58075..3eea61cf69 100644
--- a/ujit_asm.c
+++ b/ujit_asm.c
@@ -1640,3 +1640,9 @@ void xor(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1)
         opnd1
     );
 }
+
+// LOCK - lock prefix for atomic shared memory operations
+void cb_write_lock_prefix(codeblock_t* cb)
+{
+    cb_write_byte(cb, 0xF0);
+}