Prepare for compiling an ISEQ

3 files changed, 11 insertions, 972 deletions

diff --git a/lib/ruby_vm/mjit/compiler.rb b/lib/ruby_vm/mjit/compiler.rb
index a9f2aeda8d..7aea23595c 100644
--- a/lib/ruby_vm/mjit/compiler.rb
+++ b/lib/ruby_vm/mjit/compiler.rb
@@ -1,952 +1,10 @@
-# Available variables and macros in JIT-ed function:
-#   ec: the first argument of _mjitXXX
-#   reg_cfp: the second argument of _mjitXXX
-#   GET_CFP(): refers to `reg_cfp`
-#   GET_EP(): refers to `reg_cfp->ep`
-#   GET_SP(): refers to `reg_cfp->sp`, or `(stack + stack_size)` if local_stack_p
-#   GET_SELF(): refers to `cfp_self`
-#   GET_LEP(): refers to `VM_EP_LEP(reg_cfp->ep)`
-#   EXEC_EC_CFP(): refers to `val = vm_exec(ec, true)` with frame setup
-#   CALL_METHOD(): using `GET_CFP()` and `EXEC_EC_CFP()`
-#   TOPN(): refers to `reg_cfp->sp`, or `*(stack + (stack_size - num - 1))` if local_stack_p
-#   STACK_ADDR_FROM_TOP(): refers to `reg_cfp->sp`, or `stack + (stack_size - num)` if local_stack_p
-#   DISPATCH_ORIGINAL_INSN(): expanded in _mjit_compile_insn.erb
-#   THROW_EXCEPTION(): specially defined for JIT
-#   RESTORE_REGS(): specially defined for `leave`
-class RubyVM::MJIT::Compiler # :nodoc: all
-  C = RubyVM::MJIT.const_get(:C, false)
+class RubyVM::MJIT::Compiler
   INSNS = RubyVM::MJIT.const_get(:INSNS, false)
-  UNSUPPORTED_INSNS = [
-    :defineclass, # low priority
-  ]
 
   def initialize = freeze
 
   # @param iseq [RubyVM::MJIT::CPointer::Struct]
-  # @param funcname [String]
-  # @param id [Integer]
-  # @return [String,NilClass]
-  def compile(iseq, funcname, id)
-    status = C.compile_status.new # not freed for now
-    status.compiled_iseq = iseq.body
-    status.compiled_id = id
-    init_compile_status(status, iseq.body, true) # not freed for now
-    if iseq.body.ci_size > 0 && status.cc_entries_index == -1
-      return nil
-    end
-
-    src = +''
-    if !status.compile_info.disable_send_cache && !status.compile_info.disable_inlining
-      unless precompile_inlinable_iseqs(src, iseq, status)
-        return nil
-      end
-    end
-
-    src << "VALUE\n#{funcname}(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp)\n{\n"
-    success = compile_body(src, iseq, status)
-    src << "\n} // end of #{funcname}\n"
-
-    return success ? src : nil
-  rescue Exception => e # should we use rb_rescue in C instead?
-    if C.mjit_opts.warnings || C.mjit_opts.verbose > 0
-      $stderr.puts "MJIT error: #{e.full_message}"
-    end
-    return nil
-  end
-
-  private
-
-  def compile_body(src, iseq, status)
-    status.success = true
-    status.local_stack_p = !iseq.body.catch_except_p
-
-    if status.local_stack_p
-      src << "    VALUE stack[#{iseq.body.stack_max}];\n"
-    else
-      src << "    VALUE *stack = reg_cfp->sp;\n"
-    end
-
-    unless status.inlined_iseqs.nil? # i.e. compile root
-      src << "    static const rb_iseq_t *original_iseq = (const rb_iseq_t *)#{iseq};\n"
-    end
-    src << "    static const VALUE *const original_body_iseq = (VALUE *)#{iseq.body.iseq_encoded};\n"
-
-    src << "    VALUE cfp_self = reg_cfp->self;\n" # cache self across the method
-    src << "#undef GET_SELF\n"
-    src << "#define GET_SELF() cfp_self\n"
-
-    # Simulate `opt_pc` in setup_parameters_complex. Other PCs which may be passed by catch tables
-    # are not considered since vm_exec doesn't call jit_exec for catch tables.
-    if iseq.body.param.flags.has_opt
-      src << "\n"
-      src << "    switch (reg_cfp->pc - ISEQ_BODY(reg_cfp->iseq)->iseq_encoded) {\n"
-      (0..iseq.body.param.opt_num).each do |i|
-        pc_offset = iseq.body.param.opt_table[i]
-        src << "      case #{pc_offset}:\n"
-        src << "        goto label_#{pc_offset};\n"
-      end
-      src << "    }\n"
-    end
-
-    # Generate merged ivar guards first if needed
-    if !status.compile_info.disable_ivar_cache && using_ivar?(iseq.body)
-      src << "    if (UNLIKELY(!RB_TYPE_P(GET_SELF(), T_OBJECT))) {"
-      src << "        goto ivar_cancel;\n"
-      src << "    }\n"
-    end
-
-    compile_insns(0, 0, status, iseq.body, src)
-    compile_cancel_handler(src, iseq.body, status)
-    src << "#undef GET_SELF\n"
-    return status.success
-  end
-
-  # Compile one conditional branch. If it has branchXXX insn, this should be
-  # called multiple times for each branch.
-  def compile_insns(stack_size, pos, status, body, src)
-    branch = C.compile_branch.new # not freed for now
-    branch.stack_size = stack_size
-    branch.finish_p = false
-
-    while pos < body.iseq_size && !already_compiled?(status, pos) && !branch.finish_p
-      insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
-      status.stack_size_for_pos[pos] = branch.stack_size
-
-      src << "\nlabel_#{pos}: /* #{insn.name} */\n"
-      pos = compile_insn(insn, pos, status, body.iseq_encoded + (pos+1), body, branch, src)
-      if status.success && branch.stack_size > body.stack_max
-        if mjit_opts.warnings || mjit_opts.verbose > 0
-          $stderr.puts "MJIT warning: JIT stack size (#{branch.stack_size}) exceeded its max size (#{body.stack_max})"
-        end
-        status.success = false
-      end
-      break unless status.success
-    end
-  end
-
-  # Main function of JIT compilation, vm_exec_core counterpart for JIT. Compile one insn to `f`, may modify
-  # b->stack_size and return next position.
-  #
-  # When you add a new instruction to insns.def, it would be nice to have JIT compilation support here but
-  # it's optional. This JIT compiler just ignores ISeq which includes unknown instruction, and ISeq which
-  # does not have it can be compiled as usual.
-  def compile_insn(insn, pos, status, operands, body, b, src)
-    sp_inc = C.mjit_call_attribute_sp_inc(insn.bin, operands)
-    next_pos = pos + insn.len
-
-    result = compile_insn_entry(insn, b.stack_size, sp_inc, status.local_stack_p, pos, next_pos, insn.len,
-                                status.inlined_iseqs.nil?, status, operands, body)
-    if result.nil?
-      if C.mjit_opts.warnings || C.mjit_opts.verbose > 0
-        $stderr.puts "MJIT warning: Skipped to compile unsupported instruction: #{insn.name}"
-      end
-      status.success = false
-    else
-      result_src, next_pos, finish_p, compile_insns_p = result
-
-      src << result_src
-      b.stack_size += sp_inc
-
-      if finish_p
-        b.finish_p = true
-      end
-      if compile_insns_p
-        if already_compiled?(status, pos + insn.len)
-          src << "goto label_#{pos + insn.len};\n"
-        else
-          compile_insns(b.stack_size, pos + insn.len, status, body, src)
-        end
-      end
-    end
-
-    # If next_pos is already compiled and this branch is not finished yet,
-    # next instruction won't be compiled in C code next and will need `goto`.
-    if !b.finish_p && next_pos < body.iseq_size && already_compiled?(status, next_pos)
-      src << "goto label_#{next_pos};\n"
-
-      # Verify stack size assumption is the same among multiple branches
-      if status.stack_size_for_pos[next_pos] != b.stack_size
-        if mjit_opts.warnings || mjit_opts.verbose > 0
-          $stderr.puts "MJIT warning: JIT stack assumption is not the same between branches (#{status.stack_size_for_pos[next_pos]} != #{b.stack_size})\n"
-        end
-        status.success = false
-      end
-    end
-
-    return next_pos
-  end
-
-  def compile_insn_entry(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, insn_len, inlined_iseq_p, status, operands, body)
-    finish_p = false
-    compile_insns = false
-
-    # TODO: define this outside this method, or at least cache it
-    opt_send_without_block = INSNS.values.find { |i| i.name == :opt_send_without_block }
-    if opt_send_without_block.nil?
-      raise 'opt_send_without_block not found'
-    end
-    send_compatible_opt_insns = INSNS.values.select do |insn|
-      insn.name.start_with?('opt_') && opt_send_without_block.opes == insn.opes &&
-        insn.expr.lines.any? { |l| l.match(/\A\s+CALL_SIMPLE_METHOD\(\);\s+\z/) }
-    end.map(&:name)
-
-    case insn.name
-    when *UNSUPPORTED_INSNS
-      return nil
-    when :opt_send_without_block, :send
-      if src = compile_send(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, status, operands, body)
-        return src, next_pos, finish_p, compile_insns
-      end
-    when *send_compatible_opt_insns
-      if C.has_cache_for_send(captured_cc_entries(status)[call_data_index(C.CALL_DATA.new(operands[0]), body)], insn.bin) &&
-          src = compile_send(opt_send_without_block, stack_size, sp_inc, local_stack_p, pos, next_pos, status, operands, body)
-        return src, next_pos, finish_p, compile_insns
-      end
-    when :getinstancevariable, :setinstancevariable
-      if src = compile_ivar(insn.name, stack_size, pos, status, operands, body)
-        return src, next_pos, finish_p, compile_insns
-      end
-    when :opt_getconstant_path
-      if src = compile_getconstant_path(stack_size, pos, insn_len, operands, status)
-        return src, next_pos, finish_p, compile_insns
-      end
-    when :invokebuiltin, :opt_invokebuiltin_delegate, :opt_invokebuiltin_delegate_leave
-      if src = compile_invokebuiltin(insn, stack_size, sp_inc, body, operands)
-        if insn.name == :opt_invokebuiltin_delegate_leave
-          src << compile_leave(stack_size, pos, inlined_iseq_p)
-          finish_p = true
-        end
-        return src, next_pos, finish_p, compile_insns
-      end
-    when :leave
-      if stack_size != 1
-        raise "Unexpected JIT stack_size on leave: #{stack_size}"
-      end
-      src = compile_leave(stack_size, pos, inlined_iseq_p)
-      finish_p = true
-      return src, next_pos, finish_p, compile_insns
-    end
-
-    return compile_insn_default(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, insn_len, inlined_iseq_p, operands)
-  end
-
-  # Optimized case of send / opt_send_without_block instructions.
-  def compile_send(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, status, operands, body)
-    # compiler: Use captured cc to avoid race condition
-    cd = C.CALL_DATA.new(operands[0])
-    cd_index = call_data_index(cd, body)
-    captured_cc = captured_cc_entries(status)[cd_index]
-
-    # compiler: Inline send insn where some supported fastpath is used.
-    ci = cd.ci
-    kw_splat = (C.vm_ci_flag(ci) & C.VM_CALL_KW_SPLAT) > 0
-    if !status.compile_info.disable_send_cache && has_valid_method_type?(captured_cc) && (
-        # `CC_SET_FASTPATH(cd->cc, vm_call_cfunc_with_frame, ...)` in `vm_call_cfunc`
-        (vm_cc_cme(captured_cc).def.type == C.VM_METHOD_TYPE_CFUNC && !C.rb_splat_or_kwargs_p(ci) && !kw_splat) ||
-        # `CC_SET_FASTPATH(cc, vm_call_iseq_setup_func(...), vm_call_iseq_optimizable_p(...))` in `vm_callee_setup_arg`,
-        # and support only non-VM_CALL_TAILCALL path inside it
-        (vm_cc_cme(captured_cc).def.type == C.VM_METHOD_TYPE_ISEQ &&
-         C.fastpath_applied_iseq_p(ci, captured_cc, iseq = def_iseq_ptr(vm_cc_cme(captured_cc).def)) &&
-         (C.vm_ci_flag(ci) & C.VM_CALL_TAILCALL) == 0)
-    )
-      src = +"{\n"
-
-      # JIT: Invalidate call cache if it requires vm_search_method. This allows to inline some of following things.
-      src << "    const struct rb_callcache *cc = (struct rb_callcache *)#{captured_cc};\n"
-      src << "    const rb_callable_method_entry_t *cc_cme = (rb_callable_method_entry_t *)#{vm_cc_cme(captured_cc)};\n"
-      src << "    const VALUE recv = stack[#{stack_size + sp_inc - 1}];\n"
-      # If opt_class_of is true, use RBASIC_CLASS instead of CLASS_OF to reduce code size
-      opt_class_of = !maybe_special_const?(captured_cc.klass)
-      src << "    if (UNLIKELY(#{opt_class_of ? 'RB_SPECIAL_CONST_P(recv)' : 'false'} || !vm_cc_valid_p(cc, cc_cme, #{opt_class_of ? 'RBASIC_CLASS' : 'CLASS_OF'}(recv)))) {\n"
-      src << "        reg_cfp->pc = original_body_iseq + #{pos};\n"
-      src << "        reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-      src << "        goto send_cancel;\n"
-      src << "    }\n"
-
-      # JIT: move sp and pc if necessary
-      pc_moved_p = compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
-
-      # JIT: If ISeq is inlinable, call the inlined method without pushing a frame.
-      if iseq && status.inlined_iseqs && iseq.body.to_i == status.inlined_iseqs[pos]&.to_i
-        src << "    {\n"
-        src << "        VALUE orig_self = reg_cfp->self;\n"
-        src << "        reg_cfp->self = stack[#{stack_size + sp_inc - 1}];\n"
-        src << "        stack[#{stack_size + sp_inc - 1}] = _mjit#{status.compiled_id}_inlined_#{pos}(ec, reg_cfp, orig_self, original_iseq);\n"
-        src << "        reg_cfp->self = orig_self;\n"
-        src << "    }\n"
-      else
-        # JIT: Forked `vm_sendish` (except method_explorer = vm_search_method_wrap) to inline various things
-        src << "    {\n"
-        src << "        VALUE val;\n"
-        src << "        struct rb_calling_info calling;\n"
-        if insn.name == :send
-          src << "        calling.block_handler = vm_caller_setup_arg_block(ec, reg_cfp, (const struct rb_callinfo *)#{ci}, (rb_iseq_t *)0x#{operands[1].to_s(16)}, FALSE);\n"
-        else
-          src << "        calling.block_handler = VM_BLOCK_HANDLER_NONE;\n"
-        end
-        src << "        calling.kw_splat = #{kw_splat ? 1 : 0};\n"
-        src << "        calling.recv = stack[#{stack_size + sp_inc - 1}];\n"
-        src << "        calling.argc = #{C.vm_ci_argc(ci)};\n"
-
-        if vm_cc_cme(captured_cc).def.type == C.VM_METHOD_TYPE_CFUNC
-          # TODO: optimize this more
-          src << "        calling.ci = (const struct rb_callinfo *)#{ci};\n" # creating local cd here because operand's cd->cc may not be the same as inlined cc.
-          src << "        calling.cc = cc;"
-          src << "        val = vm_call_cfunc_with_frame(ec, reg_cfp, &calling);\n"
-        else # :iseq
-          # fastpath_applied_iseq_p checks rb_simple_iseq_p, which ensures has_opt == FALSE
-          src << "        vm_call_iseq_setup_normal(ec, reg_cfp, &calling, cc_cme, 0, #{iseq.body.param.size}, #{iseq.body.local_table_size});\n"
-          if iseq.body.catch_except_p
-            src << "        VM_ENV_FLAGS_SET(ec->cfp->ep, VM_FRAME_FLAG_FINISH);\n"
-            src << "        val = vm_exec(ec, true);\n"
-          else
-            src << "        if ((val = jit_exec(ec)) == Qundef) {\n"
-            src << "            VM_ENV_FLAGS_SET(ec->cfp->ep, VM_FRAME_FLAG_FINISH);\n" # This is vm_call0_body's code after vm_call_iseq_setup
-            src << "            val = vm_exec(ec, false);\n"
-            src << "        }\n"
-          end
-        end
-        src << "        stack[#{stack_size + sp_inc - 1}] = val;\n"
-        src << "    }\n"
-
-        # JIT: We should evaluate ISeq modified for TracePoint if it's enabled. Note: This is slow.
-        src << "    if (UNLIKELY(!mjit_call_p)) {\n"
-        src << "        reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size + sp_inc};\n"
-        if !pc_moved_p
-          src << "        reg_cfp->pc = original_body_iseq + #{next_pos};\n"
-        end
-        src << "        goto cancel;\n"
-        src << "    }\n"
-      end
-
-      src << "}\n"
-      return src
-    else
-      return nil
-    end
-  end
-
-  def compile_ivar(insn_name, stack_size, pos, status, operands, body)
-    iv_cache = C.iseq_inline_storage_entry.new(operands[1]).iv_cache
-    dest_shape_id = iv_cache.value >> C.SHAPE_FLAG_SHIFT
-    source_shape_id = parent_shape_id(dest_shape_id)
-    attr_index = iv_cache.value & ((1 << C.SHAPE_FLAG_SHIFT) - 1)
-
-    src = +''
-    if !status.compile_info.disable_ivar_cache && source_shape_id != C.INVALID_SHAPE_ID
-      # JIT: optimize away motion of sp and pc. This path does not call rb_warning() and so it's always leaf and not `handles_sp`.
-      # compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
-
-      # JIT: prepare vm_getivar/vm_setivar arguments and variables
-      src << "{\n"
-      src << "    VALUE obj = GET_SELF();\n" # T_OBJECT guaranteed by compile_body
-      # JIT: cache hit path of vm_getivar/vm_setivar, or cancel JIT (recompile it with exivar)
-      if insn_name == :setinstancevariable
-        src << "    const uint32_t index = #{attr_index - 1};\n"
-        src << "    const shape_id_t dest_shape_id = (shape_id_t)#{dest_shape_id};\n"
-        src << "    if (dest_shape_id == ROBJECT_SHAPE_ID(obj)) {\n"
-        src << "        VALUE *ptr = ROBJECT_IVPTR(obj);\n"
-        src << "        RB_OBJ_WRITE(obj, &ptr[index], stack[#{stack_size - 1}]);\n"
-        src << "    }\n"
-      else
-        src << "    const shape_id_t source_shape_id = (shape_id_t)#{dest_shape_id};\n"
-        if attr_index == 0 # cache hit, but uninitialized iv
-          src << "    /* Uninitialized instance variable */\n"
-          src << "    if (source_shape_id == ROBJECT_SHAPE_ID(obj)) {\n"
-          src << "        stack[#{stack_size}] = Qnil;\n"
-          src << "    }\n"
-        else
-          src << "    const uint32_t index = #{attr_index - 1};\n"
-          src << "    if (source_shape_id == ROBJECT_SHAPE_ID(obj)) {\n"
-          src << "        stack[#{stack_size}] = ROBJECT_IVPTR(obj)[index];\n"
-          src << "    }\n"
-        end
-      end
-      src << "    else {\n"
-      src << "        reg_cfp->pc = original_body_iseq + #{pos};\n"
-      src << "        reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-      src << "        goto ivar_cancel;\n"
-      src << "    }\n"
-      src << "}\n"
-      return src
-    elsif insn_name == :getinstancevariable && !status.compile_info.disable_exivar_cache && source_shape_id != C.INVALID_SHAPE_ID
-      # JIT: optimize away motion of sp and pc. This path does not call rb_warning() and so it's always leaf and not `handles_sp`.
-      # compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
-
-      # JIT: prepare vm_getivar's arguments and variables
-      src << "{\n"
-      src << "    VALUE obj = GET_SELF();\n"
-      src << "    const shape_id_t source_shape_id = (shape_id_t)#{dest_shape_id};\n"
-      src << "    const uint32_t index = #{attr_index - 1};\n"
-      # JIT: cache hit path of vm_getivar, or cancel JIT (recompile it without any ivar optimization)
-      src << "    struct gen_ivtbl *ivtbl;\n"
-      src << "    if (LIKELY(FL_TEST_RAW(GET_SELF(), FL_EXIVAR) && source_shape_id == rb_shape_get_shape_id(obj) && rb_ivar_generic_ivtbl_lookup(obj, &ivtbl))) {\n"
-      src << "        stack[#{stack_size}] = ivtbl->ivptr[index];\n"
-      src << "    }\n"
-      src << "    else {\n"
-      src << "        reg_cfp->pc = original_body_iseq + #{pos};\n"
-      src << "        reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-      src << "        goto exivar_cancel;\n"
-      src << "    }\n"
-      src << "}\n"
-      return src
-    else
-      return nil
-    end
-  end
-
-  def compile_invokebuiltin(insn, stack_size, sp_inc, body, operands)
-    bf = C.RB_BUILTIN.new(operands[0])
-    if bf.compiler > 0
-      index = (insn.name == :invokebuiltin ? -1 : operands[1])
-      src = +"{\n"
-      src << "    VALUE val;\n"
-      C.builtin_compiler(src, bf, index, stack_size, body.builtin_inline_p)
-      src << "    stack[#{stack_size + sp_inc - 1}] = val;\n"
-      src << "}\n"
-      return src
-    else
-      return nil
-    end
-  end
-
-  def compile_leave(stack_size, pos, inlined_iseq_p)
-    src = +''
-    # Skip vm_pop_frame for inlined call
-    unless inlined_iseq_p
-      # Cancel on interrupts to make leave insn leaf
-      src << "    if (UNLIKELY(RUBY_VM_INTERRUPTED_ANY(ec))) {\n"
-      src << "        reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-      src << "        reg_cfp->pc = original_body_iseq + #{pos};\n"
-      src << "        rb_threadptr_execute_interrupts(rb_ec_thread_ptr(ec), 0);\n"
-      src << "    }\n"
-      src << "    ec->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(reg_cfp);\n" # vm_pop_frame
-    end
-    src << "    return stack[0];\n"
-  end
-
-  def compile_getconstant_path(stack_size, pos, insn_len, operands, status)
-    ice = C.IC.new(operands[0]).entry
-    if !status.compile_info.disable_const_cache && ice
-      # JIT: Inline everything in IC, and cancel the slow path
-      src = +"    if (vm_inlined_ic_hit_p(#{ice.flags}, #{ice.value}, (const rb_cref_t *)#{to_addr(ice.ic_cref)}, reg_cfp->ep)) {\n"
-      src << "        stack[#{stack_size}] = #{ice.value};\n"
-      src << "    }\n"
-      src << "    else {\n"
-      src << "        reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-      src << "        reg_cfp->pc = original_body_iseq + #{pos};\n"
-      src << "        goto const_cancel;\n"
-      src << "    }\n"
-      return src
-    else
-      return nil
-    end
-  end
-
-  def compile_insn_default(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, insn_len, inlined_iseq_p, operands)
-    src = +''
-    finish_p = false
-    compile_insns = false
-
-    # JIT: Declare stack_size to be used in some macro of _mjit_compile_insn_body.erb
-    src << "{\n"
-    if local_stack_p
-      src << "    MAYBE_UNUSED(unsigned int) stack_size = #{stack_size};\n"
-    end
-
-    # JIT: Declare variables for operands, popped values and return values
-    insn.declarations.each do |decl|
-      src << "    #{decl};\n"
-    end
-
-    # JIT: Set const expressions for `RubyVM::OperandsUnifications` insn
-    insn.preamble.each do |amble|
-      src << "#{amble.sub(/const \S+\s+/, '')}\n"
-    end
-
-    # JIT: Initialize operands
-    insn.opes.each_with_index do |ope, i|
-      src << "    #{ope.fetch(:name)} = (#{ope.fetch(:type)})#{operands[i]};\n"
-      # TODO: resurrect comment_id
-    end
-
-    # JIT: Initialize popped values
-    insn.pops.reverse_each.with_index.reverse_each do |pop, i|
-      src << "    #{pop.fetch(:name)} = stack[#{stack_size - (i + 1)}];\n"
-    end
-
-    # JIT: move sp and pc if necessary
-    pc_moved_p = compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
-
-    # JIT: Print insn body in insns.def
-    next_pos = compile_insn_body(src, insn, pos, next_pos, insn_len, local_stack_p, stack_size, sp_inc, operands)
-
-    # JIT: Set return values
-    insn.rets.reverse_each.with_index do |ret, i|
-      # TOPN(n) = ...
-      src << "    stack[#{stack_size + sp_inc - (i + 1)}] = #{ret.fetch(:name)};\n"
-    end
-
-    # JIT: We should evaluate ISeq modified for TracePoint if it's enabled. Note: This is slow.
-    #      leaf insn may not cancel JIT. leaf_without_check_ints is covered in RUBY_VM_CHECK_INTS of _mjit_compile_insn_body.erb.
-    unless insn.always_leaf? || insn.leaf_without_check_ints?
-      src << "    if (UNLIKELY(!mjit_call_p)) {\n"
-      src << "        reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size + sp_inc};\n"
-      if !pc_moved_p
-        src << "        reg_cfp->pc = original_body_iseq + #{next_pos};\n"
-      end
-      src << "        goto cancel;\n"
-      src << "    }\n"
-    end
-
-    src << "}\n"
-
-    # compiler: If insn has conditional JUMP, the code should go to the branch not targeted by JUMP next.
-    if insn.expr.match?(/if\s+\([^{}]+\)\s+\{[^{}]+JUMP\([^)]+\);[^{}]+\}/)
-      compile_insns = true
-    end
-
-    # compiler: If insn returns (leave) or does longjmp (throw), the branch should no longer be compiled. TODO: create attr for it?
-    if insn.expr.match?(/\sTHROW_EXCEPTION\([^)]+\);/) || insn.expr.match?(/\bvm_pop_frame\(/)
-      finish_p = true
-    end
-
-    return src, next_pos, finish_p, compile_insns
-  end
-
-  def compile_insn_body(src, insn, pos, next_pos, insn_len, local_stack_p, stack_size, sp_inc, operands)
-    # Print a body of insn, but with macro expansion.
-    expand_simple_macros(insn.expr).each_line do |line|
-      # Expand dynamic macro here
-      # TODO: support combination of following macros in the same line
-      case line
-      when /\A\s+RUBY_VM_CHECK_INTS\(ec\);\s+\z/
-        if insn.leaf_without_check_ints? # lazily move PC and optionalize mjit_call_p here
-          src << "            if (UNLIKELY(RUBY_VM_INTERRUPTED_ANY(ec))) {\n"
-          src << "                reg_cfp->pc = original_body_iseq + #{next_pos};\n" # ADD_PC(INSN_ATTR(width));
-          src << "                rb_threadptr_execute_interrupts(rb_ec_thread_ptr(ec), 0);\n"
-          src << "                if (UNLIKELY(!mjit_call_p)) {\n"
-          src << "                    reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-          src << "                    goto cancel;\n"
-          src << "                }\n"
-          src << "            }\n"
-        else
-          src << to_cstr(line)
-        end
-      when /\A\s+JUMP\((?<dest>[^)]+)\);\s+\z/
-        dest = Regexp.last_match[:dest]
-        if insn.name == :opt_case_dispatch # special case... TODO: use another macro to avoid checking name
-          hash_offsets = C.rb_hash_values(operands[0]).uniq
-          else_offset = cast_offset(operands[1])
-          base_pos = pos + insn_len
-
-          src << "    switch (#{dest}) {\n"
-          hash_offsets.each do |offset|
-            src << "      case #{offset}:\n"
-            src << "        goto label_#{base_pos + offset};\n"
-          end
-          src << "      case #{else_offset}:\n"
-          src << "        goto label_#{base_pos + else_offset};\n"
-          src << "    }\n"
-        else
-          # Before we `goto` next insn, we need to set return values, especially for getinlinecache
-          insn.rets.reverse_each.with_index do |ret, i|
-            # TOPN(n) = ...
-            src << "            stack[#{stack_size + sp_inc - (i + 1)}] = #{ret.fetch(:name)};\n"
-          end
-
-          next_pos = pos + insn_len + cast_offset(operands[0]) # workaround: assuming dest == operands[0]. TODO: avoid relying on it
-          src << "            goto label_#{next_pos};\n"
-        end
-      when /\A\s+CALL_SIMPLE_METHOD\(\);\s+\z/
-        # For `opt_xxx`'s fallbacks.
-        if local_stack_p
-          src << "            reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-        end
-        src << "            reg_cfp->pc = original_body_iseq + #{pos};\n"
-        src << "            goto cancel;\n"
-      when /\A(?<prefix>.+\b)INSN_LABEL\((?<name>[^)]+)\)(?<suffix>.+)\z/m
-        prefix, name, suffix = Regexp.last_match[:prefix], Regexp.last_match[:name], Regexp.last_match[:suffix]
-        src << "#{prefix}INSN_LABEL(#{name}_#{pos})#{suffix}"
-      else
-        if insn.handles_sp?
-          # If insn.handles_sp? is true, cfp->sp might be changed inside insns (like vm_caller_setup_arg_block)
-          # and thus we need to use cfp->sp, even when local_stack_p is TRUE. When insn.handles_sp? is true,
-          # cfp->sp should be available too because _mjit_compile_pc_and_sp.erb sets it.
-          src << to_cstr(line)
-        else
-          # If local_stack_p is TRUE and insn.handles_sp? is false, stack values are only available in local variables
-          # for stack. So we need to replace those macros if local_stack_p is TRUE here.
-          case line
-          when /\bGET_SP\(\)/
-            # reg_cfp->sp
-            src << to_cstr(line.sub(/\bGET_SP\(\)/, local_stack_p ? '(stack + stack_size)' : 'GET_SP()'))
-          when /\bSTACK_ADDR_FROM_TOP\((?<num>[^)]+)\)/
-            # #define STACK_ADDR_FROM_TOP(n) (GET_SP()-(n))
-            num = Regexp.last_match[:num]
-            src << to_cstr(line.sub(/\bSTACK_ADDR_FROM_TOP\(([^)]+)\)/, local_stack_p ? "(stack + (stack_size - (#{num})))" : "STACK_ADDR_FROM_TOP(#{num})"))
-          when /\bTOPN\((?<num>[^)]+)\)/
-            # #define TOPN(n) (*(GET_SP()-(n)-1))
-            num = Regexp.last_match[:num]
-            src << to_cstr(line.sub(/\bTOPN\(([^)]+)\)/, local_stack_p ? "*(stack + (stack_size - (#{num}) - 1))" : "TOPN(#{num})"))
-          else
-            src << to_cstr(line)
-          end
-        end
-      end
-    end
-    return next_pos
-  end
-
-  def compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
-    # JIT: When an insn is leaf, we don't need to Move pc for a catch table on catch_except_p, #caller_locations,
-    #      and rb_profile_frames. For check_ints, we lazily move PC when we have interruptions.
-    pc_moved_p = false
-    unless insn.always_leaf? || insn.leaf_without_check_ints?
-      src << "    reg_cfp->pc = original_body_iseq + #{next_pos};\n" # ADD_PC(INSN_ATTR(width));
-      pc_moved_p = true
-    end
-
-    # JIT: move sp to use or preserve stack variables
-    if local_stack_p
-      # sp motion is optimized away for `handles_sp? #=> false` case.
-      # Thus sp should be set properly before `goto cancel`.
-      if insn.handles_sp?
-        # JIT-only behavior (pushing JIT's local variables to VM's stack):
-        push_size = -sp_inc + insn.rets.size - insn.pops.size
-        src << "    reg_cfp->sp = vm_base_ptr(reg_cfp) + #{push_size};\n"
-        push_size.times do |i|
-          src << "    *(reg_cfp->sp + #{i - push_size}) = stack[#{stack_size - push_size + i}];\n"
-        end
-      end
-    else
-      if insn.handles_sp?
-        src << "    reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size - insn.pops.size};\n" # POPN(INSN_ATTR(popn));
-      else
-        src << "    reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
-      end
-    end
-    return pc_moved_p
-  end
-
-  # Print the block to cancel inlined method call. It's supporting only `opt_send_without_block` for now.
-  def compile_inlined_cancel_handler(src, body, inline_context)
-    src << "\ncancel:\n"
-    src << "    rb_mjit_recompile_inlining(original_iseq);\n"
-
-    # Swap pc/sp set on cancel with original pc/sp.
-    src << "    const VALUE *current_pc = reg_cfp->pc;\n"
-    src << "    VALUE *current_sp = reg_cfp->sp;\n"
-    src << "    reg_cfp->pc = orig_pc;\n"
-    src << "    reg_cfp->sp = orig_sp;\n\n"
-
-    # Lazily push the current call frame.
-    src << "    struct rb_calling_info calling;\n"
-    src << "    calling.block_handler = VM_BLOCK_HANDLER_NONE;\n" # assumes `opt_send_without_block`
-    src << "    calling.argc = #{inline_context.orig_argc};\n"
-    src << "    calling.recv = reg_cfp->self;\n"
-    src << "    reg_cfp->self = orig_self;\n"
-    # fastpath_applied_iseq_p checks rb_simple_iseq_p, which ensures has_opt == FALSE
-    src << "    vm_call_iseq_setup_normal(ec, reg_cfp, &calling, (const rb_callable_method_entry_t *)#{inline_context.me}, 0, #{inline_context.param_size}, #{inline_context.local_size});\n\n"
-
-    # Start usual cancel from here.
-    src << "    reg_cfp = ec->cfp;\n" # work on the new frame
-    src << "    reg_cfp->pc = current_pc;\n"
-    src << "    reg_cfp->sp = current_sp;\n"
-    (0...body.stack_max).each do |i| # should be always `status->local_stack_p`
-      src << "    *(vm_base_ptr(reg_cfp) + #{i}) = stack[#{i}];\n"
-    end
-    # We're not just returning Qundef here so that caller's normal cancel handler can
-    # push back `stack` to `cfp->sp`.
-    src << "    return vm_exec(ec, false);\n"
-  end
-
-  # Print the block to cancel JIT execution.
-  def compile_cancel_handler(src, body, status)
-    if status.inlined_iseqs.nil? # the current ISeq is being inlined
-      compile_inlined_cancel_handler(src, body, status.inline_context)
-      return
-    end
-
-    src << "\nsend_cancel:\n"
-    src << "    rb_mjit_recompile_send(original_iseq);\n"
-    src << "    goto cancel;\n"
-
-    src << "\nivar_cancel:\n"
-    src << "    rb_mjit_recompile_ivar(original_iseq);\n"
-    src << "    goto cancel;\n"
-
-    src << "\nexivar_cancel:\n"
-    src << "    rb_mjit_recompile_exivar(original_iseq);\n"
-    src << "    goto cancel;\n"
-
-    src << "\nconst_cancel:\n"
-    src << "    rb_mjit_recompile_const(original_iseq);\n"
-    src << "    goto cancel;\n"
-
-    src << "\ncancel:\n"
-    if status.local_stack_p
-      (0...body.stack_max).each do |i|
-        src << "    *(vm_base_ptr(reg_cfp) + #{i}) = stack[#{i}];\n"
-      end
-    end
-    src << "    return Qundef;\n"
-  end
-
-  def precompile_inlinable_child_iseq(src, child_iseq, status, ci, cc, pos)
-    child_status = C.compile_status.new # not freed for now
-    child_status.compiled_iseq = status.compiled_iseq
-    child_status.compiled_id = status.compiled_id
-    init_compile_status(child_status, child_iseq.body, false) # not freed for now
-    child_status.inline_context.orig_argc = C.vm_ci_argc(ci)
-    child_status.inline_context.me = vm_cc_cme(cc).to_i
-    child_status.inline_context.param_size = child_iseq.body.param.size
-    child_status.inline_context.local_size = child_iseq.body.local_table_size
-    if child_iseq.body.ci_size > 0 && child_status.cc_entries_index == -1
-      return false
-    end
-
-    src << "ALWAYS_INLINE(static VALUE _mjit#{status.compiled_id}_inlined_#{pos}(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, const VALUE orig_self, const rb_iseq_t *original_iseq));\n"
-    src << "static inline VALUE\n_mjit#{status.compiled_id}_inlined_#{pos}(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, const VALUE orig_self, const rb_iseq_t *original_iseq)\n{\n"
-    src << "    const VALUE *orig_pc = reg_cfp->pc;\n"
-    src << "    VALUE *orig_sp = reg_cfp->sp;\n"
-
-    success = compile_body(src, child_iseq, child_status)
-
-    src << "\n} /* end of _mjit#{status.compiled_id}_inlined_#{pos} */\n\n"
-
-    return success;
-  end
-
-  def precompile_inlinable_iseqs(src, iseq, status)
-    body = iseq.body
-    pos = 0
-    while pos < body.iseq_size
-      insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
-      if insn.name == :opt_send_without_block || insn.name == :opt_size # `compile_inlined_cancel_handler` supports only `opt_send_without_block`
-        cd = C.CALL_DATA.new(body.iseq_encoded[pos + 1])
-        ci = cd.ci
-        cc = captured_cc_entries(status)[call_data_index(cd, body)] # use copy to avoid race condition
-
-        if (child_iseq = rb_mjit_inlinable_iseq(ci, cc)) != nil
-          status.inlined_iseqs[pos] = child_iseq.body
-
-          if C.mjit_opts.verbose >= 1 # print beforehand because ISeq may be GCed during copy job.
-            child_location = child_iseq.body.location
-            $stderr.puts "JIT inline: #{child_location.label}@#{C.rb_iseq_path(child_iseq)}:#{C.rb_iseq_first_lineno(child_iseq)} " \
-              "=> #{iseq.body.location.label}@#{C.rb_iseq_path(iseq)}:#{C.rb_iseq_first_lineno(iseq)}"
-          end
-          if !precompile_inlinable_child_iseq(src, child_iseq, status, ci, cc, pos)
-            return false
-          end
-        end
-      end
-      pos += insn.len
-    end
-    return true
-  end
-
-  def init_compile_status(status, body, compile_root_p)
-    status.stack_size_for_pos = Fiddle.malloc(Fiddle::SIZEOF_INT * body.iseq_size)
-    body.iseq_size.times do |i|
-      status.stack_size_for_pos[i] = C.NOT_COMPILED_STACK_SIZE
-    end
-    if compile_root_p
-      status.inlined_iseqs = Fiddle.malloc(Fiddle::SIZEOF_VOIDP * body.iseq_size)
-      body.iseq_size.times do |i|
-        status.inlined_iseqs[i] = nil
-      end
-    end
-    if body.ci_size > 0
-      status.cc_entries_index = C.mjit_capture_cc_entries(status.compiled_iseq, body)
-    else
-      status.cc_entries_index = -1
-    end
-    if compile_root_p
-      status.compile_info = rb_mjit_iseq_compile_info(body)
-    else
-      status.compile_info = Fiddle.malloc(C.rb_mjit_compile_info.sizeof)
-      status.compile_info.disable_ivar_cache = false
-      status.compile_info.disable_exivar_cache = false
-      status.compile_info.disable_send_cache = false
-      status.compile_info.disable_inlining = false
-      status.compile_info.disable_const_cache = false
-    end
-  end
-
-  def using_ivar?(body)
-    pos = 0
-    while pos < body.iseq_size
-      insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
-      case insn.name
-      when :getinstancevariable, :setinstancevariable
-        return true
-      end
-      pos += insn.len
-    end
-    return false
-  end
-
-  # Expand simple macro that doesn't require dynamic C code.
-  def expand_simple_macros(arg_expr)
-    arg_expr.dup.tap do |expr|
-      # For `leave`. We can't proceed next ISeq in the same JIT function.
-      expr.gsub!(/^(?<indent>\s*)RESTORE_REGS\(\);\n/) do
-        indent = Regexp.last_match[:indent]
-        <<-end.gsub(/^ {12}/, '')
-          #if OPT_CALL_THREADED_CODE
-          #{indent}rb_ec_thread_ptr(ec)->retval = val;
-          #{indent}return 0;
-          #else
-          #{indent}return val;
-          #endif
-        end
-      end
-      expr.gsub!(/^(?<indent>\s*)NEXT_INSN\(\);\n/) do
-        indent = Regexp.last_match[:indent]
-        <<-end.gsub(/^ {12}/, '')
-          #{indent}UNREACHABLE_RETURN(Qundef);
-        end
-      end
-    end
-  end
-
-  def to_cstr(expr)
-    expr.gsub(/^(?!#)/, '    ') # indent everything but preprocessor lines
-  end
-
-  # Interpret unsigned long as signed long (VALUE -> OFFSET)
-  def cast_offset(offset)
-    if offset >= 1 << 8 * Fiddle::SIZEOF_VOIDP - 1 # negative
-      offset -= 1 << 8 * Fiddle::SIZEOF_VOIDP
-    end
-    offset
-  end
-
-  def captured_cc_entries(status)
-    status.compiled_iseq.mjit_unit.cc_entries + status.cc_entries_index
-  end
-
-  def call_data_index(cd, body)
-    cd - body.call_data
-  end
-
-  def vm_cc_cme(cc)
-    # TODO: add VM_ASSERT like actual vm_cc_cme
-    cc.cme_
-  end
-
-  def def_iseq_ptr(method_def)
-    C.rb_iseq_check(method_def.body.iseq.iseqptr)
-  end
-
-  def rb_mjit_iseq_compile_info(body)
-    body.mjit_unit.compile_info
-  end
-
-  def ISEQ_IS_SIZE(body)
-    body.ic_size + body.ivc_size + body.ise_size + body.icvarc_size
-  end
-
-  # Return true if an object of the class may be a special const (immediate).
-  # It's "maybe" because Integer and Float are not guaranteed to be an immediate.
-  # If this returns false, rb_class_of could be optimzied to RBASIC_CLASS.
-  def maybe_special_const?(klass)
-    [
-      C.rb_cFalseClass,
-      C.rb_cNilClass,
-      C.rb_cTrueClass,
-      C.rb_cInteger,
-      C.rb_cSymbol,
-      C.rb_cFloat,
-    ].include?(klass)
-  end
-
-  def has_valid_method_type?(cc)
-    vm_cc_cme(cc) != nil
-  end
-
-  def already_compiled?(status, pos)
-    status.stack_size_for_pos[pos] != C.NOT_COMPILED_STACK_SIZE
-  end
-
-  # Return an iseq pointer if cc has inlinable iseq.
-  def rb_mjit_inlinable_iseq(ci, cc)
-    if has_valid_method_type?(cc) &&
-        C.vm_ci_flag(ci) & C.VM_CALL_TAILCALL == 0 && # inlining only non-tailcall path
-        vm_cc_cme(cc).def.type == C.VM_METHOD_TYPE_ISEQ &&
-        C.fastpath_applied_iseq_p(ci, cc, iseq = def_iseq_ptr(vm_cc_cme(cc).def)) &&
-        inlinable_iseq_p(iseq.body) # CC_SET_FASTPATH in vm_callee_setup_arg
-      return iseq
-    end
-    return nil
-  end
-
-  # Return true if the ISeq can be inlined without pushing a new control frame.
-  def inlinable_iseq_p(body)
-    # 1) If catch_except_p, caller frame should be preserved when callee catches an exception.
-    # Then we need to wrap `vm_exec()` but then we can't inline the call inside it.
-    #
-    # 2) If `body->catch_except_p` is false and `handles_sp?` of an insn is false,
-    # sp is not moved as we assume `status->local_stack_p = !body->catch_except_p`.
-    #
-    # 3) If `body->catch_except_p` is false and `always_leaf?` of an insn is true,
-    # pc is not moved.
-    if body.catch_except_p
-      return false
-    end
-
-    pos = 0
-    while pos < body.iseq_size
-      insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
-      # All insns in the ISeq except `leave` (to be overridden in the inlined code)
-      # should meet following strong assumptions:
-      #   * Do not require `cfp->sp` motion
-      #   * Do not move `cfp->pc`
-      #   * Do not read any `cfp->pc`
-      if insn.name == :invokebuiltin || insn.name == :opt_invokebuiltin_delegate || insn.name == :opt_invokebuiltin_delegate_leave
-        # builtin insn's inlinability is handled by `Primitive.attr! 'inline'` per iseq
-        if !body.builtin_inline_p
-          return false;
-        end
-      elsif insn.name != :leave && C.insn_may_depend_on_sp_or_pc(insn.bin, body.iseq_encoded + (pos + 1))
-        return false
-      end
-      # At this moment, `cfp->ep` in an inlined method is not working.
-      case insn.name
-      when :getlocal,
-           :getlocal_WC_0,
-           :getlocal_WC_1,
-           :setlocal,
-           :setlocal_WC_0,
-           :setlocal_WC_1,
-           :getblockparam,
-           :getblockparamproxy,
-           :setblockparam
-        return false
-      end
-      pos += insn.len
-    end
-    return true
-  end
-
-  # CPointer::Struct could be nil on field reference, and this is a helper to
-  # handle that case while using CPointer::Struct#to_s in most cases.
-  # @param struct [RubyVM::MJIT::CPointer::Struct]
-  def to_addr(struct)
-    struct&.to_s || 'NULL'
-  end
-
-  def parent_shape_id(shape_id)
-    return shape_id if shape_id == C.INVALID_SHAPE_ID
-
-    parent_id = C.rb_shape_get_shape_by_id(shape_id).parent_id
-    parent = C.rb_shape_get_shape_by_id(parent_id)
-
-    if parent.type == C.SHAPE_CAPACITY_CHANGE
-      parent.parent_id
-    else
-      parent_id
-    end
+  def compile(iseq)
+    # TODO: implement
   end
 end
diff --git a/mjit.c b/mjit.c
index ee3aa3fb5e..e2def203e7 100644
--- a/mjit.c
+++ b/mjit.c
@@ -366,6 +366,7 @@ mjit_compile(FILE *f, const rb_iseq_t *iseq, const char *funcname, int id)
     return false;
 }
 
+//================================================================================
 //
 // New stuff from here
 //
@@ -373,7 +374,13 @@ mjit_compile(FILE *f, const rb_iseq_t *iseq, const char *funcname, int id)
 void
 rb_mjit_compile(const rb_iseq_t *iseq)
 {
-    // TODO: implement
+    bool original_call_p = mjit_call_p;
+    mjit_call_p = false; // Avoid impacting JIT metrics by itself
+
+    VALUE iseq_ptr = rb_funcall(rb_cMJITIseqPtr, rb_intern("new"), 1, SIZET2NUM((size_t)iseq));
+    rb_funcall(rb_cMJITCompiler, rb_intern("compile"), 1, iseq_ptr);
+
+    mjit_call_p = original_call_p;
 }
 
 void
diff --git a/vm.c b/vm.c
index 822c2c7ba4..feb07c5922 100644
--- a/vm.c
+++ b/vm.c
@@ -382,32 +382,6 @@ extern VALUE rb_vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, V
 static VALUE vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self, int argc, const VALUE *argv, int kw_splat, VALUE block_handler);
 
 #if USE_MJIT || USE_YJIT
-# ifdef MJIT_HEADER
-NOINLINE(static COLDFUNC VALUE mjit_check_iseq(rb_execution_context_t *ec, const rb_iseq_t *iseq, struct rb_iseq_constant_body *body));
-# else
-static inline VALUE mjit_check_iseq(rb_execution_context_t *ec, const rb_iseq_t *iseq, struct rb_iseq_constant_body *body);
-# endif
-static VALUE
-mjit_check_iseq(rb_execution_context_t *ec, const rb_iseq_t *iseq, struct rb_iseq_constant_body *body)
-{
-    uintptr_t mjit_state = (uintptr_t)(body->jit_func);
-    ASSUME(MJIT_FUNC_STATE_P(mjit_state));
-    switch ((enum rb_mjit_func_state)mjit_state) {
-      case MJIT_FUNC_NOT_COMPILED:
-        if (body->total_calls == mjit_opts.call_threshold) {
-            rb_mjit_compile(iseq);
-            if (UNLIKELY(mjit_opts.wait && !MJIT_FUNC_STATE_P(body->jit_func))) {
-                return body->jit_func(ec, ec->cfp);
-            }
-        }
-        break;
-      case MJIT_FUNC_COMPILING:
-      case MJIT_FUNC_FAILED:
-        break;
-    }
-    return Qundef;
-}
-
 // Try to execute the current iseq in ec.  Use JIT code if it is ready.
 // If it is not, add ISEQ to the compilation queue and return Qundef for MJIT.
 // YJIT compiles on the thread running the iseq.