Fix broken rebase

lib/ruby_vm/mjit/insn_compiler.rb

@@ -0,0 +1,51 @@
+module RubyVM::MJIT
+  #  ec: rdi
+  # cfp: rsi
+  #  sp: rbx
+  # scratch regs: rax
+  class InsnCompiler
+    # @param jit [RubyVM::MJIT::JITState]
+    # @param ctx [RubyVM::MJIT::Context]
+    # @param asm [RubyVM::MJIT::X86Assembler]
+    def putnil(jit, ctx, asm)
+      asm.mov([SP], Qnil)
+      ctx.stack_size += 1
+      KeepCompiling
+    end
+
+    # @param jit [RubyVM::MJIT::JITState]
+    # @param ctx [RubyVM::MJIT::Context]
+    # @param asm [RubyVM::MJIT::X86Assembler]
+    def leave(jit, ctx, asm)
+      assert_eq!(ctx.stack_size, 1)
+
+      asm.comment("RUBY_VM_CHECK_INTS(ec)")
+      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
+      asm.write_label(not_interrupted)
+
+      asm.comment("pop stack frame")
+      asm.add(CFP, C.rb_control_frame_t.size) # cfp = cfp + 1
+      asm.mov([EC, C.rb_execution_context_t.offsetof(:cfp)], CFP) # ec->cfp = cfp
+
+      # Return a value
+      asm.mov(:rax, [SP])
+
+      # Restore callee-saved registers
+      asm.pop(SP)
+
+      asm.ret
+      EndBlock
+    end
+
+    private
+
+    def assert_eq!(left, right)
+      if left != right
+        raise "'#{left.inspect}' was not '#{right.inspect}'"
+      end
+    end
+  end
+end