/*
** opcode.h - RiteVM operation codes
**
** See Copyright Notice in mruby.h
*/

#ifndef OPCODE_H
#define OPCODE_H

#define MAXARG_Bx        (0xffff)
#define MAXARG_sBx       (MAXARG_Bx>>1)         /* `sBx' is signed */

/* instructions: packed 32 bit      */
/* -------------------------------  */
/*     A:B:C:OP = 9: 9: 7: 7        */
/*      A:Bx:OP =    9:16: 7        */
/*        Ax:OP =      25: 7        */
/*   A:Bz:Cz:OP = 9:14: 2: 7        */

#define GET_OPCODE(i)            ((int)(((mrb_code)(i)) & 0x7f))
#define GETARG_A(i)              ((int)((((mrb_code)(i)) >> 23) & 0x1ff))
#define GETARG_B(i)              ((int)((((mrb_code)(i)) >> 14) & 0x1ff))
#define GETARG_C(i)              ((int)((((mrb_code)(i)) >>  7) & 0x7f))
#define GETARG_Bx(i)             ((int)((((mrb_code)(i)) >>  7) & 0xffff))
#define GETARG_sBx(i)            ((int)(GETARG_Bx(i)-MAXARG_sBx))
#define GETARG_Ax(i)             ((int32_t)((((mrb_code)(i)) >>  7) & 0x1ffffff))
#define GETARG_UNPACK_b(i,n1,n2) ((int)((((mrb_code)(i)) >> (7+(n2))) & (((1<<(n1))-1))))
#define GETARG_UNPACK_c(i,n1,n2) ((int)((((mrb_code)(i)) >> 7) & (((1<<(n2))-1))))
#define GETARG_b(i)              GETARG_UNPACK_b(i,14,2)
#define GETARG_c(i)              GETARG_UNPACK_c(i,14,2)

#define MKOPCODE(op)          ((op) & 0x7f)
#define MKARG_A(c)            ((mrb_code)((c) & 0x1ff) << 23)
#define MKARG_B(c)            ((mrb_code)((c) & 0x1ff) << 14)
#define MKARG_C(c)            (((c) & 0x7f) <<  7)
#define MKARG_Bx(v)           ((mrb_code)((v) & 0xffff) << 7)
#define MKARG_sBx(v)          MKARG_Bx((v)+MAXARG_sBx)
#define MKARG_Ax(v)           ((mrb_code)((v) & 0x1ffffff) << 7)
#define MKARG_PACK(b,n1,c,n2) ((((b) & ((1<<n1)-1)) << (7+n2))|(((c) & ((1<<n2)-1)) << 7))
#define MKARG_bc(b,c)         MKARG_PACK(b,14,c,2)

#define MKOP_A(op,a)        (MKOPCODE(op)|MKARG_A(a))
#define MKOP_AB(op,a,b)     (MKOP_A(op,a)|MKARG_B(b))
#define MKOP_ABC(op,a,b,c)  (MKOP_AB(op,a,b)|MKARG_C(c))
#define MKOP_ABx(op,a,bx)   (MKOP_A(op,a)|MKARG_Bx(bx))
#define MKOP_Bx(op,bx)      (MKOPCODE(op)|MKARG_Bx(bx))
#define MKOP_sBx(op,sbx)    (MKOPCODE(op)|MKARG_sBx(sbx))
#define MKOP_AsBx(op,a,sbx) (MKOP_A(op,a)|MKARG_sBx(sbx))
#define MKOP_Ax(op,ax)      (MKOPCODE(op)|MKARG_Ax(ax))
#define MKOP_Abc(op,a,b,c)  (MKOP_A(op,a)|MKARG_bc(b,c))

enum {
  /*-----------------------------------------------------------------------
  operation code  operand description
  ------------------------------------------------------------------------*/
  OP_NOP=0,/*                                                             */
  OP_MOVE,/*      A B     R(A) := R(B)                                    */
  OP_LOADL,/*     A Bx    R(A) := Pool(Bx)                                */
  OP_LOADI,/*     A sBx   R(A) := sBx                                     */
  OP_LOADSYM,/*   A Bx    R(A) := Syms(Bx)                                */
  OP_LOADNIL,/*   A       R(A) := nil                                     */
  OP_LOADSELF,/*  A       R(A) := self                                    */
  OP_LOADT,/*     A       R(A) := true                                    */
  OP_LOADF,/*     A       R(A) := false                                   */

  OP_GETGLOBAL,/* A Bx    R(A) := getglobal(Syms(Bx))                     */
  OP_SETGLOBAL,/* A Bx    setglobal(Syms(Bx), R(A))                       */
  OP_GETSPECIAL,/*A Bx    R(A) := Special[Bx]                             */
  OP_SETSPECIAL,/*A Bx    Special[Bx] := R(A)                             */
  OP_GETIV,/*     A Bx    R(A) := ivget(Syms(Bx))                         */
  OP_SETIV,/*     A Bx    ivset(Syms(Bx),R(A))                            */
  OP_GETCV,/*     A Bx    R(A) := cvget(Syms(Bx))                         */
  OP_SETCV,/*     A Bx    cvset(Syms(Bx),R(A))                            */
  OP_GETCONST,/*  A Bx    R(A) := constget(Syms(Bx))                      */
  OP_SETCONST,/*  A Bx    constset(Syms(Bx),R(A))                         */
  OP_GETMCNST,/*  A Bx    R(A) := R(A)::Syms(Bx)                          */
  OP_SETMCNST,/*  A Bx    R(A+1)::Syms(Bx) := R(A)                        */
  OP_GETUPVAR,/*  A B C   R(A) := uvget(B,C)                              */
  OP_SETUPVAR,/*  A B C   uvset(B,C,R(A))                                 */

  OP_JMP,/*       sBx     pc+=sBx                                         */
  OP_JMPIF,/*     A sBx   if R(A) pc+=sBx                                 */
  OP_JMPNOT,/*    A sBx   if !R(A) pc+=sBx                                */
  OP_ONERR,/*     sBx     rescue_push(pc+sBx)                             */
  OP_RESCUE,/*    A       clear(exc); R(A) := exception (ignore when A=0) */
  OP_POPERR,/*    A       A.times{rescue_pop()}                           */
  OP_RAISE,/*     A       raise(R(A))                                     */
  OP_EPUSH,/*     Bx      ensure_push(SEQ[Bx])                            */
  OP_EPOP,/*      A       A.times{ensure_pop().call}                      */

  OP_SEND,/*      A B C   R(A) := call(R(A),Syms(B),R(A+1),...,R(A+C))    */
  OP_SENDB,/*     A B C   R(A) := call(R(A),Syms(B),R(A+1),...,R(A+C),&R(A+C+1))*/
  OP_FSEND,/*     A B C   R(A) := fcall(R(A),Syms(B),R(A+1),...,R(A+C-1)) */
  OP_CALL,/*      A       R(A) := self.call(frame.argc, frame.argv)       */
  OP_SUPER,/*     A C     R(A) := super(R(A+1),... ,R(A+C+1))             */
  OP_ARGARY,/*    A Bx    R(A) := argument array (16=6:1:5:4)             */
  OP_ENTER,/*     Ax      arg setup according to flags (23=5:5:1:5:5:1:1) */
  OP_KARG,/*      A B C   R(A) := kdict[Syms(B)]; if C kdict.rm(Syms(B))  */
  OP_KDICT,/*     A C     R(A) := kdict                                   */

  OP_RETURN,/*    A B     return R(A) (B=normal,in-block return/break)    */
  OP_TAILCALL,/*  A B C   return call(R(A),Syms(B),*R(C))                 */
  OP_BLKPUSH,/*   A Bx    R(A) := block (16=6:1:5:4)                      */

  OP_ADD,/*       A B C   R(A) := R(A)+R(A+1) (Syms[B]=:+,C=1)            */
  OP_ADDI,/*      A B C   R(A) := R(A)+C (Syms[B]=:+)                     */
  OP_SUB,/*       A B C   R(A) := R(A)-R(A+1) (Syms[B]=:-,C=1)            */
  OP_SUBI,/*      A B C   R(A) := R(A)-C (Syms[B]=:-)                     */
  OP_MUL,/*       A B C   R(A) := R(A)*R(A+1) (Syms[B]=:*,C=1)            */
  OP_DIV,/*       A B C   R(A) := R(A)/R(A+1) (Syms[B]=:/,C=1)            */
  OP_EQ,/*        A B C   R(A) := R(A)==R(A+1) (Syms[B]=:==,C=1)          */
  OP_LT,/*        A B C   R(A) := R(A)<R(A+1)  (Syms[B]=:<,C=1)           */
  OP_LE,/*        A B C   R(A) := R(A)<=R(A+1) (Syms[B]=:<=,C=1)          */
  OP_GT,/*        A B C   R(A) := R(A)>R(A+1)  (Syms[B]=:>,C=1)           */
  OP_GE,/*        A B C   R(A) := R(A)>=R(A+1) (Syms[B]=:>=,C=1)          */

  OP_ARRAY,/*     A B C   R(A) := ary_new(R(B),R(B+1)..R(B+C))            */
  OP_ARYCAT,/*    A B     ary_cat(R(A),R(B))                              */
  OP_ARYPUSH,/*   A B     ary_push(R(A),R(B))                             */
  OP_AREF,/*      A B C   R(A) := R(B)[C]                                 */
  OP_ASET,/*      A B C   R(B)[C] := R(A)                                 */
  OP_APOST,/*     A B C   *R(A),R(A+1)..R(A+C) := R(A)                    */

  OP_STRING,/*    A Bx    R(A) := str_dup(Lit(Bx))                        */
  OP_STRCAT,/*    A B     str_cat(R(A),R(B))                              */

  OP_HASH,/*      A B C   R(A) := hash_new(R(B),R(B+1)..R(B+C))           */
  OP_LAMBDA,/*    A Bz Cz R(A) := lambda(SEQ[Bz],Cz)                      */
  OP_RANGE,/*     A B C   R(A) := range_new(R(B),R(B+1),C)                */

  OP_OCLASS,/*    A       R(A) := ::Object                                */
  OP_CLASS,/*     A B     R(A) := newclass(R(A),Syms(B),R(A+1))           */
  OP_MODULE,/*    A B     R(A) := newmodule(R(A),Syms(B))                 */
  OP_EXEC,/*      A Bx    R(A) := blockexec(R(A),SEQ[Bx])                 */
  OP_METHOD,/*    A B     R(A).newmethod(Syms(B),R(A+1))                  */
  OP_SCLASS,/*    A B     R(A) := R(B).singleton_class                    */
  OP_TCLASS,/*    A       R(A) := target_class                            */

  OP_DEBUG,/*     A B C   print R(A),R(B),R(C)                            */
  OP_STOP,/*              stop VM                                         */
  OP_ERR,/*       Bx      raise RuntimeError with message Lit(Bx)         */

  OP_RSVD1,/*             reserved instruction #1                         */
  OP_RSVD2,/*             reserved instruction #2                         */
  OP_RSVD3,/*             reserved instruction #3                         */
  OP_RSVD4,/*             reserved instruction #4                         */
  OP_RSVD5,/*             reserved instruction #5                         */
};

#define OP_L_STRICT  1
#define OP_L_CAPTURE 2
#define OP_L_METHOD  OP_L_STRICT
#define OP_L_LAMBDA  (OP_L_STRICT|OP_L_CAPTURE)
#define OP_L_BLOCK   OP_L_CAPTURE

#define OP_R_NORMAL 0
#define OP_R_BREAK  1
#define OP_R_RETURN 2

#endif  /* OPCODE_H */
