Invalidate JIT-ed code if ISeq is moved by GC.compact

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67638 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

debug_counter.h

@@ -274,7 +274,7 @@ RB_DEBUG_COUNTER(mjit_cancel)
 RB_DEBUG_COUNTER(mjit_cancel_ivar_inline)
 RB_DEBUG_COUNTER(mjit_cancel_send_inline)
 RB_DEBUG_COUNTER(mjit_cancel_opt_insn) /* CALL_SIMPLE_METHOD */
-RB_DEBUG_COUNTER(mjit_cancel_trace)
+RB_DEBUG_COUNTER(mjit_cancel_invalidate_all)
 
 /* rb_mjit_unit_list length */
 RB_DEBUG_COUNTER(mjit_length_unit_queue)

mjit.c

@@ -120,6 +120,9 @@ mjit_update_references(const rb_iseq_t *iseq)
     CRITICAL_SECTION_START(4, "mjit_free_iseq");
     if (iseq->body->jit_unit) {
         iseq->body->jit_unit->iseq = (rb_iseq_t *)rb_gc_new_location((VALUE)iseq->body->jit_unit->iseq);
+        // We need to invalidate JIT-ed code for the ISeq because it embeds pointer addresses.
+        // To efficiently do that, we use the same thing as TracePoint and thus everything is cancelled for now.
+        mjit_call_p = false; // TODO: instead of cancelling all, invalidate only this one and recompile it with some threshold.
     }
 
     // Units in stale_units (list of over-speculated and invalidated code) are not referenced from
@@ -313,6 +316,7 @@ unload_units(void)
     for (cont = first_cont; cont != NULL; cont = cont->next) {
         mark_ec_units(cont->ec);
     }
+    // TODO: check slale_units and unload unused ones! (note that the unit is not associated to ISeq anymore)
 
     // Remove 1/10 units more to decrease unloading calls.
     // TODO: Calculate max total_calls in unit_queue and don't unload units

tool/ruby_vm/views/_mjit_compile_insn.erb

@@ -61,12 +61,12 @@
 %
 % # JIT: We should evaluate ISeq modified for TracePoint if it's enabled. Note: This is slow.
 % unless insn.always_leaf?
-        fprintf(f, "    if (UNLIKELY(ruby_vm_event_enabled_global_flags & ISEQ_TRACE_EVENTS)) {\n");
+        fprintf(f, "    if (UNLIKELY(!mjit_call_p)) {\n");
         fprintf(f, "        reg_cfp->sp = vm_base_ptr(reg_cfp) + %d;\n", b->stack_size + (int)<%= insn.call_attribute('sp_inc') %>);
         if (!pc_moved_p) {
             fprintf(f, "        reg_cfp->pc = original_body_iseq + %d;\n", next_pos);
         }
-        fprintf(f, "        RB_DEBUG_COUNTER_INC(mjit_cancel_trace);\n");
+        fprintf(f, "        RB_DEBUG_COUNTER_INC(mjit_cancel_invalidate_all);\n");
         fprintf(f, "        goto cancel;\n");
         fprintf(f, "    }\n");
 % end

tool/ruby_vm/views/_mjit_compile_send.erb

@@ -86,12 +86,12 @@
                 fprintf(f, "    }\n");
 
 % # JIT: We should evaluate ISeq modified for TracePoint if it's enabled. Note: This is slow.
-                fprintf(f, "    if (UNLIKELY(ruby_vm_event_enabled_global_flags & ISEQ_TRACE_EVENTS)) {\n");
+                fprintf(f, "    if (UNLIKELY(!mjit_call_p)) {\n");
                 fprintf(f, "        reg_cfp->sp = vm_base_ptr(reg_cfp) + %d;\n", b->stack_size + (int)<%= insn.call_attribute('sp_inc') %>);
                 if (!pc_moved_p) {
                     fprintf(f, "        reg_cfp->pc = original_body_iseq + %d;\n", next_pos);
                 }
-                fprintf(f, "        RB_DEBUG_COUNTER_INC(mjit_cancel_trace);\n");
+                fprintf(f, "        RB_DEBUG_COUNTER_INC(mjit_cancel_invalidate_all);\n");
                 fprintf(f, "        goto cancel;\n");
                 fprintf(f, "    }\n");
             }