Implement bmethod

4 files changed, 153 insertions, 25 deletions

diff --git a/lib/ruby_vm/mjit/insn_compiler.rb b/lib/ruby_vm/mjit/insn_compiler.rb
index 0c53430dfe..ceafe65351 100644
--- a/lib/ruby_vm/mjit/insn_compiler.rb
+++ b/lib/ruby_vm/mjit/insn_compiler.rb
@@ -3131,7 +3131,8 @@ module RubyVM::MJIT
     def jit_call_method_each_type(jit, ctx, asm, argc, flags, cme, comptime_recv, recv_opnd, block_handler, known_recv_class, send_shift:)
       case cme.def.type
       when C.VM_METHOD_TYPE_ISEQ
-        jit_call_iseq_setup(jit, ctx, asm, cme, flags, argc, block_handler, send_shift:)
+        iseq = def_iseq_ptr(cme.def)
+        jit_call_iseq_setup(jit, ctx, asm, cme, flags, argc, iseq, block_handler, send_shift:)
       when C.VM_METHOD_TYPE_NOTIMPLEMENTED
         asm.incr_counter(:send_notimplemented)
         return CantCompile
@@ -3146,8 +3147,7 @@ module RubyVM::MJIT
         asm.incr_counter(:send_missing)
         return CantCompile
       when C.VM_METHOD_TYPE_BMETHOD
-        asm.incr_counter(:send_bmethod)
-        return CantCompile
+        jit_call_bmethod(jit, ctx, asm, argc, flags, cme, comptime_recv, recv_opnd, block_handler, known_recv_class, send_shift:)
       when C.VM_METHOD_TYPE_ALIAS
         jit_call_alias(jit, ctx, asm, argc, flags, cme, comptime_recv, recv_opnd, block_handler, known_recv_class, send_shift:)
       when C.VM_METHOD_TYPE_OPTIMIZED
@@ -3171,8 +3171,7 @@ module RubyVM::MJIT
     # @param jit [RubyVM::MJIT::JITState]
     # @param ctx [RubyVM::MJIT::Context]
     # @param asm [RubyVM::MJIT::Assembler]
-    def jit_call_iseq_setup(jit, ctx, asm, cme, flags, argc, block_handler, send_shift:)
-      iseq = def_iseq_ptr(cme.def)
+    def jit_call_iseq_setup(jit, ctx, asm, cme, flags, argc, iseq, block_handler, send_shift:, frame_type: nil, prev_ep: nil)
       opt_pc = jit_callee_setup_arg(jit, ctx, asm, flags, argc, iseq)
       if opt_pc == CantCompile
         return CantCompile
@@ -3183,14 +3182,14 @@ module RubyVM::MJIT
         asm.incr_counter(:send_tailcall)
         return CantCompile
       end
-      jit_call_iseq_setup_normal(jit, ctx, asm, cme, flags, argc, iseq, block_handler, opt_pc, send_shift:)
+      jit_call_iseq_setup_normal(jit, ctx, asm, cme, flags, argc, iseq, block_handler, opt_pc, send_shift:, frame_type:, prev_ep:)
     end
 
     # vm_call_iseq_setup_normal (vm_call_iseq_setup_2 -> vm_call_iseq_setup_normal)
     # @param jit [RubyVM::MJIT::JITState]
     # @param ctx [RubyVM::MJIT::Context]
     # @param asm [RubyVM::MJIT::Assembler]
-    def jit_call_iseq_setup_normal(jit, ctx, asm, cme, flags, argc, iseq, block_handler, opt_pc, send_shift:)
+    def jit_call_iseq_setup_normal(jit, ctx, asm, cme, flags, argc, iseq, block_handler, opt_pc, send_shift:, frame_type:, prev_ep:)
       # We will not have side exits from here. Adjust the stack.
       if flags & C.VM_CALL_OPT_SEND != 0
         jit_call_opt_send_shift_stack(ctx, asm, argc, send_shift:)
@@ -3204,12 +3203,13 @@ module RubyVM::MJIT
       asm.mov([CFP, C.rb_control_frame_t.offsetof(:sp)], :rax)
       jit_save_pc(jit, asm, comment: 'save PC to caller CFP')
 
-      frame_type = C.VM_FRAME_MAGIC_METHOD | C.VM_ENV_FLAG_LOCAL
+      frame_type ||= C.VM_FRAME_MAGIC_METHOD | C.VM_ENV_FLAG_LOCAL
       jit_push_frame(
         jit, ctx, asm, cme, flags, argc, frame_type, block_handler,
         iseq:       iseq,
         local_size: iseq.body.local_table_size - iseq.body.param.size,
         stack_max:  iseq.body.stack_max,
+        prev_ep:,
       )
 
       # Jump to a stub for the callee ISEQ
@@ -3361,7 +3361,47 @@ module RubyVM::MJIT
       jit_getivar(jit, ctx, asm, comptime_recv, ivar_id, recv_opnd)
     end
 
+    # vm_call_bmethod
+    # @param jit [RubyVM::MJIT::JITState]
+    # @param ctx [RubyVM::MJIT::Context]
+    # @param asm [RubyVM::MJIT::Assembler]
+    def jit_call_bmethod(jit, ctx, asm, argc, flags, cme, comptime_recv, recv_opnd, block_handler, known_recv_class, send_shift:)
+      proc_addr = cme.def.body.bmethod.proc
+
+      proc_t = C.rb_yjit_get_proc_ptr(proc_addr)
+      proc_block = proc_t.block
+
+      if proc_block.type != C.block_type_iseq
+        asm.incr_counter(:send_optimized_bmethod_not_iseq)
+        return CantCompile
+      end
+
+      capture = proc_block.as.captured
+      iseq = capture.code.iseq
+
+      # TODO: implement this
+      # Optimize for single ractor mode and avoid runtime check for
+      # "defined with an un-shareable Proc in a different Ractor"
+      # if !assume_single_ractor_mode(jit, ocb)
+      #     return CantCompile;
+      # end
+
+      # Passing a block to a block needs logic different from passing
+      # a block to a method and sometimes requires allocation. Bail for now.
+      if block_handler != C.VM_BLOCK_HANDLER_NONE
+        asm.incr_counter(:send_optimized_bmethod_blockarg)
+        return CantCompile
+      end
+
+      frame_type = C.VM_FRAME_MAGIC_BLOCK | C.VM_FRAME_FLAG_BMETHOD | C.VM_FRAME_FLAG_LAMBDA
+      prev_ep = capture.ep
+      jit_call_iseq_setup(jit, ctx, asm, cme, flags, argc, iseq, block_handler, send_shift:, frame_type:, prev_ep:)
+    end
+
     # vm_call_alias
+    # @param jit [RubyVM::MJIT::JITState]
+    # @param ctx [RubyVM::MJIT::Context]
+    # @param asm [RubyVM::MJIT::Assembler]
     def jit_call_alias(jit, ctx, asm, argc, flags, cme, comptime_recv, recv_opnd, block_handler, known_recv_class, send_shift:)
       cme = C.rb_aliased_callable_method_entry(cme)
       jit_call_method_each_type(jit, ctx, asm, argc, flags, cme, comptime_recv, recv_opnd, block_handler, known_recv_class, send_shift:)
@@ -3550,7 +3590,7 @@ module RubyVM::MJIT
     # @param jit [RubyVM::MJIT::JITState]
     # @param ctx [RubyVM::MJIT::Context]
     # @param asm [RubyVM::MJIT::Assembler]
-    def jit_push_frame(jit, ctx, asm, cme, flags, argc, frame_type, block_handler, iseq: nil, local_size: 0, stack_max: 0)
+    def jit_push_frame(jit, ctx, asm, cme, flags, argc, frame_type, block_handler, iseq: nil, local_size: 0, stack_max: 0, prev_ep: nil)
       # CHECK_VM_STACK_OVERFLOW0: next_cfp <= sp + (local_size + stack_max)
       asm.comment('stack overflow check')
       asm.lea(:rax, ctx.sp_opnd(C.rb_control_frame_t.size + C.VALUE.size * (local_size + stack_max)))
@@ -3580,7 +3620,10 @@ module RubyVM::MJIT
       asm.mov(:rax, cme.to_i)
       asm.mov([SP, C.VALUE.size * (ep_offset - 2)], :rax)
       # ep[-1]: block handler or prev env ptr
-      if block_handler == C.VM_BLOCK_HANDLER_NONE
+      if prev_ep
+        asm.mov(:rax, prev_ep.to_i | 1) # tagged prev ep
+        asm.mov([SP, C.VALUE.size * (ep_offset - 1)], :rax)
+      elsif block_handler == C.VM_BLOCK_HANDLER_NONE
         asm.mov([SP, C.VALUE.size * (ep_offset - 1)], C.VM_BLOCK_HANDLER_NONE)
       elsif block_handler == C.rb_block_param_proxy
         # vm_caller_setup_arg_block:
diff --git a/mjit_c.h b/mjit_c.h
index 2e233d41de..b73da56d0d 100644
--- a/mjit_c.h
+++ b/mjit_c.h
@@ -152,12 +152,6 @@ MJIT_RUNTIME_COUNTERS(
     send_ivar_opt_send,
     send_ivar_blockarg,
 
-    send_optimized_call,
-    send_optimized_block_call,
-    send_optimized_struct_aref,
-    send_optimized_struct_aset,
-    send_optimized_unknown_type,
-
     send_optimized_send_no_args,
     send_optimized_send_not_sym_or_str,
     send_optimized_send_mid_class_changed,
@@ -169,6 +163,14 @@ MJIT_RUNTIME_COUNTERS(
     send_optimized_call_splat,
     send_optimized_blockarg,
 
+    send_optimized_block_call,
+    send_optimized_struct_aref,
+    send_optimized_struct_aset,
+    send_optimized_unknown_type,
+
+    send_optimized_bmethod_not_iseq,
+    send_optimized_bmethod_blockarg,
+
     invokesuper_me_changed,
     invokesuper_same_me,
 
diff --git a/mjit_c.rb b/mjit_c.rb
index 8db0cc42f3..ece67ac6e3 100644
--- a/mjit_c.rb
+++ b/mjit_c.rb
@@ -412,6 +412,14 @@ module RubyVM::MJIT # :nodoc: all
       rb_callable_method_entry_t.new(cme_addr)
     end
 
+    def rb_yjit_get_proc_ptr(proc_addr)
+      proc_t_addr = Primitive.cstmt! %{
+        extern rb_proc_t * rb_yjit_get_proc_ptr(VALUE procv);
+        return SIZET2NUM((size_t)rb_yjit_get_proc_ptr((VALUE)NUM2SIZET(proc_addr)));
+      }
+      rb_proc_t.new(proc_t_addr)
+    end
+
     #========================================================================================
     #
     # Old stuff
@@ -781,6 +789,10 @@ module RubyVM::MJIT # :nodoc: all
     Primitive.cexpr! %q{ UINT2NUM(VM_ENV_FLAG_WB_REQUIRED) }
   end
 
+  def C.VM_FRAME_FLAG_BMETHOD
+    Primitive.cexpr! %q{ UINT2NUM(VM_FRAME_FLAG_BMETHOD) }
+  end
+
   def C.VM_FRAME_FLAG_CFRAME
     Primitive.cexpr! %q{ UINT2NUM(VM_FRAME_FLAG_CFRAME) }
   end
@@ -789,10 +801,18 @@ module RubyVM::MJIT # :nodoc: all
     Primitive.cexpr! %q{ UINT2NUM(VM_FRAME_FLAG_CFRAME_KW) }
   end
 
+  def C.VM_FRAME_FLAG_LAMBDA
+    Primitive.cexpr! %q{ UINT2NUM(VM_FRAME_FLAG_LAMBDA) }
+  end
+
   def C.VM_FRAME_FLAG_MODIFIED_BLOCK_PARAM
     Primitive.cexpr! %q{ UINT2NUM(VM_FRAME_FLAG_MODIFIED_BLOCK_PARAM) }
   end
 
+  def C.VM_FRAME_MAGIC_BLOCK
+    Primitive.cexpr! %q{ UINT2NUM(VM_FRAME_MAGIC_BLOCK) }
+  end
+
   def C.VM_FRAME_MAGIC_CFUNC
     Primitive.cexpr! %q{ UINT2NUM(VM_FRAME_MAGIC_CFUNC) }
   end
@@ -849,6 +869,10 @@ module RubyVM::MJIT # :nodoc: all
     Primitive.cexpr! %q{ UINT2NUM(VM_METHOD_TYPE_ZSUPER) }
   end
 
+  def C.block_type_iseq
+    Primitive.cexpr! %q{ UINT2NUM(block_type_iseq) }
+  end
+
   def C.imemo_iseq
     Primitive.cexpr! %q{ UINT2NUM(imemo_iseq) }
   end
@@ -1118,6 +1142,23 @@ module RubyVM::MJIT # :nodoc: all
     )
   end
 
+  def C.rb_block
+    @rb_block ||= CType::Struct.new(
+      "rb_block", Primitive.cexpr!("SIZEOF(struct rb_block)"),
+      as: [CType::Union.new(
+        "", Primitive.cexpr!("SIZEOF(((struct rb_block *)NULL)->as)"),
+        captured: self.rb_captured_block,
+        symbol: self.VALUE,
+        proc: self.VALUE,
+      ), Primitive.cexpr!("OFFSETOF((*((struct rb_block *)NULL)), as)")],
+      type: [self.rb_block_type, Primitive.cexpr!("OFFSETOF((*((struct rb_block *)NULL)), type)")],
+    )
+  end
+
+  def C.rb_block_type
+    @rb_block_type ||= CType::Immediate.parse("int")
+  end
+
   def C.rb_builtin_function
     @rb_builtin_function ||= CType::Struct.new(
       "rb_builtin_function", Primitive.cexpr!("SIZEOF(struct rb_builtin_function)"),
@@ -1189,6 +1230,20 @@ module RubyVM::MJIT # :nodoc: all
     )
   end
 
+  def C.rb_captured_block
+    @rb_captured_block ||= CType::Struct.new(
+      "rb_captured_block", Primitive.cexpr!("SIZEOF(struct rb_captured_block)"),
+      self: [self.VALUE, Primitive.cexpr!("OFFSETOF((*((struct rb_captured_block *)NULL)), self)")],
+      ep: [CType::Pointer.new { self.VALUE }, Primitive.cexpr!("OFFSETOF((*((struct rb_captured_block *)NULL)), ep)")],
+      code: [CType::Union.new(
+        "", Primitive.cexpr!("SIZEOF(((struct rb_captured_block *)NULL)->code)"),
+        iseq: CType::Pointer.new { self.rb_iseq_t },
+        ifunc: CType::Pointer.new { self.vm_ifunc },
+        val: self.VALUE,
+      ), Primitive.cexpr!("OFFSETOF((*((struct rb_captured_block *)NULL)), code)")],
+    )
+  end
+
   def C.rb_control_frame_t
     @rb_control_frame_t ||= CType::Struct.new(
       "rb_control_frame_struct", Primitive.cexpr!("SIZEOF(struct rb_control_frame_struct)"),
@@ -1366,6 +1421,15 @@ module RubyVM::MJIT # :nodoc: all
     )
   end
 
+  def C.rb_method_bmethod_t
+    @rb_method_bmethod_t ||= CType::Struct.new(
+      "rb_method_bmethod_struct", Primitive.cexpr!("SIZEOF(struct rb_method_bmethod_struct)"),
+      proc: [self.VALUE, Primitive.cexpr!("OFFSETOF((*((struct rb_method_bmethod_struct *)NULL)), proc)")],
+      hooks: [CType::Pointer.new { self.rb_hook_list_struct }, Primitive.cexpr!("OFFSETOF((*((struct rb_method_bmethod_struct *)NULL)), hooks)")],
+      defined_ractor: [self.VALUE, Primitive.cexpr!("OFFSETOF((*((struct rb_method_bmethod_struct *)NULL)), defined_ractor)")],
+    )
+  end
+
   def C.rb_method_cfunc_t
     @rb_method_cfunc_t ||= CType::Struct.new(
       "rb_method_cfunc_struct", Primitive.cexpr!("SIZEOF(struct rb_method_cfunc_struct)"),
@@ -1481,11 +1545,6 @@ module RubyVM::MJIT # :nodoc: all
       send_ivar_splat: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_ivar_splat)")],
       send_ivar_opt_send: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_ivar_opt_send)")],
       send_ivar_blockarg: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_ivar_blockarg)")],
-      send_optimized_call: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_call)")],
-      send_optimized_block_call: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_block_call)")],
-      send_optimized_struct_aref: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_struct_aref)")],
-      send_optimized_struct_aset: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_struct_aset)")],
-      send_optimized_unknown_type: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_unknown_type)")],
       send_optimized_send_no_args: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_send_no_args)")],
       send_optimized_send_not_sym_or_str: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_send_not_sym_or_str)")],
       send_optimized_send_mid_class_changed: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_send_mid_class_changed)")],
@@ -1496,6 +1555,12 @@ module RubyVM::MJIT # :nodoc: all
       send_optimized_call_kwarg: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_call_kwarg)")],
       send_optimized_call_splat: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_call_splat)")],
       send_optimized_blockarg: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_blockarg)")],
+      send_optimized_block_call: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_block_call)")],
+      send_optimized_struct_aref: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_struct_aref)")],
+      send_optimized_struct_aset: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_struct_aset)")],
+      send_optimized_unknown_type: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_unknown_type)")],
+      send_optimized_bmethod_not_iseq: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_bmethod_not_iseq)")],
+      send_optimized_bmethod_blockarg: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), send_optimized_bmethod_blockarg)")],
       invokesuper_me_changed: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), invokesuper_me_changed)")],
       invokesuper_same_me: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), invokesuper_same_me)")],
       getivar_megamorphic: [CType::Immediate.parse("size_t"), Primitive.cexpr!("OFFSETOF((*((struct rb_mjit_runtime_counters *)NULL)), getivar_megamorphic)")],
@@ -1542,6 +1607,13 @@ module RubyVM::MJIT # :nodoc: all
     )
   end
 
+  def C.rb_proc_t
+    @rb_proc_t ||= CType::Struct.new(
+      "", Primitive.cexpr!("SIZEOF(rb_proc_t)"),
+      block: [self.rb_block, Primitive.cexpr!("OFFSETOF((*((rb_proc_t *)NULL)), block)")],
+    )
+  end
+
   def C.rb_serial_t
     @rb_serial_t ||= CType::Immediate.parse("unsigned long long")
   end
@@ -1642,6 +1714,10 @@ module RubyVM::MJIT # :nodoc: all
     CType::Stub.new(:rb_callinfo_kwarg)
   end
 
+  def C.vm_ifunc
+    CType::Stub.new(:vm_ifunc)
+  end
+
   def C.rb_cref_struct
     CType::Stub.new(:rb_cref_struct)
   end
@@ -1718,10 +1794,6 @@ module RubyVM::MJIT # :nodoc: all
     CType::Stub.new(:rb_method_refined_t)
   end
 
-  def C.rb_method_bmethod_t
-    CType::Stub.new(:rb_method_bmethod_t)
-  end
-
   def C.ccan_list_node
     CType::Stub.new(:ccan_list_node)
   end
diff --git a/tool/mjit/bindgen.rb b/tool/mjit/bindgen.rb
index a06e16e139..3f39ddfa48 100755
--- a/tool/mjit/bindgen.rb
+++ b/tool/mjit/bindgen.rb
@@ -214,6 +214,7 @@ class BindingGenerator
             to_ruby = @ruby_fields.fetch(node.spelling, []).include?(field)
             if child.bitwidth > 0
               if bit_fields_end <= i # give up offsetof calculation for non-leading bit fields
+                binding.irb
                 raise "non-leading bit fields are not supported. consider including '#{field}' in skip_fields."
               end
               offsetof = node.offsetof.fetch(field)
@@ -407,6 +408,9 @@ generator = BindingGenerator.new(
       VM_ENV_FLAG_WB_REQUIRED
       VM_FRAME_MAGIC_METHOD
       VM_FRAME_MAGIC_CFUNC
+      VM_FRAME_MAGIC_BLOCK
+      VM_FRAME_FLAG_BMETHOD
+      VM_FRAME_FLAG_LAMBDA
       VM_FRAME_FLAG_CFRAME
       VM_FRAME_FLAG_CFRAME_KW
       VM_FRAME_FLAG_MODIFIED_BLOCK_PARAM
@@ -423,6 +427,7 @@ generator = BindingGenerator.new(
       VM_METHOD_TYPE_ZSUPER
       VM_METHOD_TYPE_REFINED
       imemo_iseq
+      block_type_iseq
     ],
     ULONG: %w[
       INVALID_SHAPE_ID
@@ -490,6 +495,7 @@ generator = BindingGenerator.new(
     rb_method_definition_struct
     rb_method_iseq_t
     rb_method_type_t
+    rb_method_bmethod_t
     rb_mjit_compile_info
     rb_mjit_runtime_counters
     rb_mjit_unit
@@ -501,6 +507,10 @@ generator = BindingGenerator.new(
     rb_method_optimized_t
     method_optimized_type
     rb_thread_struct
+    rb_proc_t
+    rb_block
+    rb_block_type
+    rb_captured_block
   ],
   dynamic_types: %w[
     VALUE
@@ -511,6 +521,7 @@ generator = BindingGenerator.new(
     rb_execution_context_struct: %w[method_missing_reason], # non-leading bit fields not supported
     rb_iseq_constant_body: %w[yjit_payload], # conditionally defined
     rb_thread_struct: %w[status locking_native_thread to_kill abort_on_exception report_on_exception pending_interrupt_queue_checked],
+    :'' => %w[is_from_method is_lambda is_isolated], # rb_proc_t
   },
   ruby_fields: {
     rb_iseq_constant_body: %w[