mjit.c: copy inline cache values to MJIT worker

on VM_CHECK_INTS. Letting MJIT worker directly see inline cache which
may be being updated could result in inconsistent IC index and serial.

mjit_worker.c: request the copy job after dequeue, and receive the
result synchronously.

tool/ruby_vm/views/_mjit_compile_ivar.erb: use the copied IC

mjit_compile.c: change the interface to pass is_entries
mjit.h: ditto

=== Optcarrot Benchmark ===
Thankfully this didn't have major performance regression.

$ benchmark-driver benchmark.yml --rbenv 'before::before --disable-gems --jit;after::after --disable-gems --jit' -v --repeat-count 24
before: ruby 2.6.0dev (2018-10-21 trunk 65263) +JIT [x86_64-linux]
after: ruby 2.6.0dev (2018-10-21 trunk 65263) +JIT [x86_64-linux]
last_commit=mjit.c: copy inline cache values to MJIT worker
Calculating -------------------------------------
                             before       after
Optcarrot Lan_Master.nes     85.421      85.454 fps

Comparison:
             Optcarrot Lan_Master.nes
                   after:        85.5 fps
                  before:        85.4 fps - 1.00x  slower

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65275 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/mjit.c b/mjit.c
index 88df66bb77..f2b2581f7a 100644
--- a/mjit.c
+++ b/mjit.c
@@ -20,6 +20,19 @@
 #include "constant.h"
 #include "id_table.h"
 
+/* Copy ISeq's states so that race condition does not happen on compilation. */
+static void
+mjit_copy_job_handler(void *data)
+{
+    struct mjit_copy_job *job = (struct mjit_copy_job *)data;
+    memcpy(job->is_entries, job->body->is_entries, sizeof(union iseq_inline_storage_entry) * job->body->is_size);
+
+    CRITICAL_SECTION_START(3, "in MJIT copy job wait");
+    job->finish_p = TRUE;
+    rb_native_cond_broadcast(&mjit_worker_wakeup);
+    CRITICAL_SECTION_FINISH(3, "in MJIT copy job wait");
+}
+
 extern int rb_thread_create_mjit_thread(void (*worker_func)(void));
 
 /* Return an unique file name in /tmp with PREFIX and SUFFIX and