From dd547ac093c998342e220cd5ec8d5a0c0d7240e4 Mon Sep 17 00:00:00 2001
From: Yuichi Nishiwaki <yuichi.nishiwaki@gmail.com>
Date: Tue, 4 Feb 2014 16:20:17 +0900
Subject: [PATCH] add OP_NOP

---
 include/picrin/irep.h | 1 +
 src/codegen.c         | 3 +++
 src/vm.c              | 5 ++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/picrin/irep.h b/include/picrin/irep.h
index f436dcbe..7de2b5a2 100644
--- a/include/picrin/irep.h
+++ b/include/picrin/irep.h
@@ -10,6 +10,7 @@ extern "C" {
 #endif
 
 enum pic_opcode {
+  OP_NOP,
   OP_POP,
   OP_PUSHNIL,
   OP_PUSHTRUE,
diff --git a/src/codegen.c b/src/codegen.c
index 1dfb0e7f..14bb906f 100644
--- a/src/codegen.c
+++ b/src/codegen.c
@@ -1493,6 +1493,9 @@ print_code(pic_state *pic, struct pic_code c)
 
   printf("[%2d] ", c.insn);
   switch (c.insn) {
+  case OP_NOP:
+    puts("OP_NOP");
+    break;
   case OP_POP:
     puts("OP_POP");
     break;
diff --git a/src/vm.c b/src/vm.c
index 14d713dc..d9cd024b 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -387,7 +387,7 @@ pic_apply(pic_state *pic, struct pic_proc *proc, pic_value argv)
 
 #if PIC_DIRECT_THREADED_VM
   static void *oplabels[] = {
-    &&L_OP_POP, &&L_OP_PUSHNIL, &&L_OP_PUSHTRUE, &&L_OP_PUSHFALSE,
+    &&L_OP_NOP, &&L_OP_POP, &&L_OP_PUSHNIL, &&L_OP_PUSHTRUE, &&L_OP_PUSHFALSE,
     &&L_OP_PUSHINT, &&L_OP_PUSHCHAR, &&L_OP_PUSHCONST,
     &&L_OP_GREF, &&L_OP_GSET, &&L_OP_LREF, &&L_OP_LSET, &&L_OP_CREF, &&L_OP_CSET,
     &&L_OP_JMP, &&L_OP_JMPIF, &&L_OP_NOT, &&L_OP_CALL, &&L_OP_TAILCALL, &&L_OP_RET,
@@ -443,6 +443,9 @@ pic_apply(pic_state *pic, struct pic_proc *proc, pic_value argv)
   goto L_CALL;
 
   VM_LOOP {
+    CASE(OP_NOP) {
+      NEXT;
+    }
     CASE(OP_POP) {
       POPN(1);
       NEXT;