Try carving out ExitCompiler

lib/ruby_vm/mjit/compiler.rb

@@ -1,4 +1,5 @@
 require 'ruby_vm/mjit/context'
+require 'ruby_vm/mjit/exit_compiler'
 require 'ruby_vm/mjit/insn_compiler'
 require 'ruby_vm/mjit/instruction'
 require 'ruby_vm/mjit/jit_state'
@@ -22,35 +23,6 @@ module RubyVM::MJIT
   class Compiler
     attr_accessor :write_pos
 
-    # @param jit [RubyVM::MJIT::JITState]
-    # @param ctx [RubyVM::MJIT::Context]
-    # @param asm [RubyVM::MJIT::X86Assembler]
-    def self.compile_exit(jit, ctx, asm)
-      if C.mjit_opts.stats
-        insn = decode_insn(C.VALUE.new(jit.pc).*)
-        asm.comment("increment insn exit: #{insn.name}")
-        asm.mov(:rax, (C.mjit_insn_exits + insn.bin).to_i)
-        asm.add([:rax], 1) # TODO: lock
-      end
-      asm.comment("exit to interpreter")
-
-      # Update pc
-      asm.mov(:rax, jit.pc) # rax = jit.pc
-      asm.mov([CFP, C.rb_control_frame_t.offsetof(:pc)], :rax) # cfp->pc = rax
-
-      # Update sp
-      if ctx.stack_size > 0
-        asm.add(SP, C.VALUE.size * ctx.stack_size) # rbx += stack_size
-        asm.mov([CFP, C.rb_control_frame_t.offsetof(:sp)], SP) # cfp->sp = rbx
-      end
-
-      # Restore callee-saved registers
-      asm.pop(SP)
-
-      asm.mov(:rax, Qundef)
-      asm.ret
-    end
-
     def self.decode_insn(encoded)
       INSNS.fetch(C.rb_vm_insn_decode(encoded))
     end
@@ -60,6 +32,7 @@ module RubyVM::MJIT
       @comments = Hash.new { |h, k| h[k] = [] }
       @mem_block = mem_block
       @write_pos = 0
+      @exit_compiler = ExitCompiler.new
       @insn_compiler = InsnCompiler.new
     end
 
@@ -138,7 +111,7 @@ module RubyVM::MJIT
         when EndBlock
           break
         when CantCompile
-          self.class.compile_exit(jit, ctx, asm)
+          @exit_compiler.compile_exit(jit, ctx, asm)
           break
         end
         index += insn.len
@@ -213,7 +186,7 @@ module RubyVM::MJIT
       # opt_newarray_min
       # invokesuper
       # invokeblock
-      when :leave  then @insn_compiler.leave(jit, ctx, asm)
+      when :leave then @insn_compiler.leave(jit, ctx, asm)
       # throw
       # jump
       # branchif

lib/ruby_vm/mjit/exit_compiler.rb

@@ -0,0 +1,34 @@
+module RubyVM::MJIT
+  class ExitCompiler
+    def initialize = freeze
+
+    # @param jit [RubyVM::MJIT::JITState]
+    # @param ctx [RubyVM::MJIT::Context]
+    # @param asm [RubyVM::MJIT::X86Assembler]
+    def compile_exit(jit, ctx, asm)
+      if C.mjit_opts.stats
+        insn = decode_insn(C.VALUE.new(jit.pc).*)
+        asm.comment("increment insn exit: #{insn.name}")
+        asm.mov(:rax, (C.mjit_insn_exits + insn.bin).to_i)
+        asm.add([:rax], 1) # TODO: lock
+      end
+      asm.comment("exit to interpreter")
+
+      # Update pc
+      asm.mov(:rax, jit.pc) # rax = jit.pc
+      asm.mov([CFP, C.rb_control_frame_t.offsetof(:pc)], :rax) # cfp->pc = rax
+
+      # Update sp
+      if ctx.stack_size > 0
+        asm.add(SP, C.VALUE.size * ctx.stack_size) # rbx += stack_size
+        asm.mov([CFP, C.rb_control_frame_t.offsetof(:sp)], SP) # cfp->sp = rbx
+      end
+
+      # Restore callee-saved registers
+      asm.pop(SP)
+
+      asm.mov(:rax, Qundef)
+      asm.ret
+    end
+  end
+end

lib/ruby_vm/mjit/insn_compiler.rb

@@ -5,6 +5,10 @@ module RubyVM::MJIT
   # scratch regs: rax
   class InsnCompiler
     # 4/101
+    def initialize
+      @exit_compiler = ExitCompiler.new
+      freeze
+    end
 
     # nop
     # getlocal
@@ -106,7 +110,7 @@ module RubyVM::MJIT
       asm.mov(:eax, [EC, C.rb_execution_context_t.offsetof(:interrupt_flag)])
       asm.test(:eax, :eax)
       asm.jz(not_interrupted = asm.new_label(:not_interrupted))
-      Compiler.compile_exit(jit, ctx, asm) # TODO: use ocb
+      @exit_compiler.compile_exit(jit, ctx, asm) # TODO: use ocb
       asm.write_label(not_interrupted)
 
       asm.comment('pop stack frame')