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lj_bc.h
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/*
** Bytecode instruction format.
** Copyright (C) 2005-2013 Mike Pall. See Copyright Notice in luajit.h
*/
#ifndef _LJ_BC_H
#define _LJ_BC_H
#include "lj_def.h"
#include "lj_arch.h"
/* Bytecode instruction format, 32 bit wide, fields of 8 or 16 bit:
**
** +----+----+----+----+
** | B | C | A | OP | Format ABC
** +----+----+----+----+
** | D | A | OP | Format AD
** +--------------------
** MSB LSB
**
** In-memory instructions are always stored in host byte order.
*/
/* Operand ranges and related constants. */
#define BCMAX_A 0xff
#define BCMAX_B 0xff
#define BCMAX_C 0xff
#define BCMAX_D 0xffff
#define BCBIAS_J 0x8000
#define NO_REG BCMAX_A
#define NO_JMP (~(BCPos)0)
/* Macros to get instruction fields. */
#define bc_op(i) ((BCOp)((i)&0xff))
#define bc_a(i) ((BCReg)(((i)>>8)&0xff))
#define bc_b(i) ((BCReg)((i)>>24))
#define bc_c(i) ((BCReg)(((i)>>16)&0xff))
#define bc_d(i) ((BCReg)((i)>>16))
#define bc_j(i) ((ptrdiff_t)bc_d(i)-BCBIAS_J)
/* Macros to set instruction fields. */
#define setbc_byte(p, x, ofs) \
((uint8_t *)(p))[LJ_ENDIAN_SELECT(ofs, 3-ofs)] = (uint8_t)(x)
#define setbc_op(p, x) setbc_byte(p, (x), 0)
#define setbc_a(p, x) setbc_byte(p, (x), 1)
#define setbc_b(p, x) setbc_byte(p, (x), 3)
#define setbc_c(p, x) setbc_byte(p, (x), 2)
#define setbc_d(p, x) \
((uint16_t *)(p))[LJ_ENDIAN_SELECT(1, 0)] = (uint16_t)(x)
#define setbc_j(p, x) setbc_d(p, (BCPos)((int32_t)(x)+BCBIAS_J))
/* Macros to compose instructions. */
#define BCINS_ABC(o, a, b, c) \
(((BCIns)(o))|((BCIns)(a)<<8)|((BCIns)(b)<<24)|((BCIns)(c)<<16))
#define BCINS_AD(o, a, d) \
(((BCIns)(o))|((BCIns)(a)<<8)|((BCIns)(d)<<16))
#define BCINS_AJ(o, a, j) BCINS_AD(o, a, (BCPos)((int32_t)(j)+BCBIAS_J))
/* Bytecode instruction definition. Order matters, see below.
**
** (name, filler, Amode, Bmode, Cmode or Dmode, metamethod)
**
** The opcode name suffixes specify the type for RB/RC or RD:
** V = variable slot
** S = string const
** N = number const
** P = primitive type (~itype)
** B = unsigned byte literal
** M = multiple args/results
*/
#define BCDEF(_) \
/* Comparison ops. ORDER OPR. */ \
_(ISLT, var, ___, var, lt) \
_(ISGE, var, ___, var, lt) \
_(ISLE, var, ___, var, le) \
_(ISGT, var, ___, var, le) \
\
_(ISEQV, var, ___, var, eq) \
_(ISNEV, var, ___, var, eq) \
_(ISEQS, var, ___, str, eq) \
_(ISNES, var, ___, str, eq) \
_(ISEQN, var, ___, num, eq) \
_(ISNEN, var, ___, num, eq) \
_(ISEQP, var, ___, pri, eq) \
_(ISNEP, var, ___, pri, eq) \
\
/* Unary test and copy ops. */ \
_(ISTC, dst, ___, var, ___) \
_(ISFC, dst, ___, var, ___) \
_(IST, ___, ___, var, ___) \
_(ISF, ___, ___, var, ___) \
\
/* Unary ops. */ \
_(MOV, dst, ___, var, ___) \
_(NOT, dst, ___, var, ___) \
_(UNM, dst, ___, var, unm) \
_(LEN, dst, ___, var, len) \
\
/* Binary ops. ORDER OPR. VV last, POW must be next. */ \
_(ADDVN, dst, var, num, add) \
_(SUBVN, dst, var, num, sub) \
_(MULVN, dst, var, num, mul) \
_(DIVVN, dst, var, num, div) \
_(MODVN, dst, var, num, mod) \
\
_(ADDNV, dst, var, num, add) \
_(SUBNV, dst, var, num, sub) \
_(MULNV, dst, var, num, mul) \
_(DIVNV, dst, var, num, div) \
_(MODNV, dst, var, num, mod) \
\
_(ADDVV, dst, var, var, add) \
_(SUBVV, dst, var, var, sub) \
_(MULVV, dst, var, var, mul) \
_(DIVVV, dst, var, var, div) \
_(MODVV, dst, var, var, mod) \
\
_(POW, dst, var, var, pow) \
_(CAT, dst, rbase, rbase, concat) \
\
/* Constant ops. */ \
_(KSTR, dst, ___, str, ___) \
_(KCDATA, dst, ___, cdata, ___) \
_(KSHORT, dst, ___, lits, ___) \
_(KNUM, dst, ___, num, ___) \
_(KPRI, dst, ___, pri, ___) \
_(KNIL, base, ___, base, ___) \
\
/* Upvalue and function ops. */ \
_(UGET, dst, ___, uv, ___) \
_(USETV, uv, ___, var, ___) \
_(USETS, uv, ___, str, ___) \
_(USETN, uv, ___, num, ___) \
_(USETP, uv, ___, pri, ___) \
_(UCLO, rbase, ___, jump, ___) \
_(FNEW, dst, ___, func, gc) \
\
/* Table ops. */ \
_(TNEW, dst, ___, lit, gc) \
_(TDUP, dst, ___, tab, gc) \
_(GGET, dst, ___, str, index) \
_(GSET, var, ___, str, newindex) \
_(TGETV, dst, var, var, index) \
_(TGETS, dst, var, str, index) \
_(TGETB, dst, var, lit, index) \
_(TSETV, var, var, var, newindex) \
_(TSETS, var, var, str, newindex) \
_(TSETB, var, var, lit, newindex) \
_(TSETM, base, ___, num, newindex) \
\
/* Calls and vararg handling. T = tail call. */ \
_(CALLM, base, lit, lit, call) \
_(CALL, base, lit, lit, call) \
_(CALLMT, base, ___, lit, call) \
_(CALLT, base, ___, lit, call) \
_(ITERC, base, lit, lit, call) \
_(ITERN, base, lit, lit, call) \
_(VARG, base, lit, lit, ___) \
_(ISNEXT, base, ___, jump, ___) \
\
/* Returns. */ \
_(RETM, base, ___, lit, ___) \
_(RET, rbase, ___, lit, ___) \
_(RET0, rbase, ___, lit, ___) \
_(RET1, rbase, ___, lit, ___) \
\
/* Loops and branches. I/J = interp/JIT, I/C/L = init/call/loop. */ \
_(FORI, base, ___, jump, ___) \
_(JFORI, base, ___, jump, ___) \
\
_(FORL, base, ___, jump, ___) \
_(IFORL, base, ___, jump, ___) \
_(JFORL, base, ___, lit, ___) \
\
_(ITERL, base, ___, jump, ___) \
_(IITERL, base, ___, jump, ___) \
_(JITERL, base, ___, lit, ___) \
\
_(LOOP, rbase, ___, jump, ___) \
_(ILOOP, rbase, ___, jump, ___) \
_(JLOOP, rbase, ___, lit, ___) \
\
_(JMP, rbase, ___, jump, ___) \
\
/* Function headers. I/J = interp/JIT, F/V/C = fixarg/vararg/C func. */ \
_(FUNCF, rbase, ___, ___, ___) \
_(IFUNCF, rbase, ___, ___, ___) \
_(JFUNCF, rbase, ___, lit, ___) \
_(FUNCV, rbase, ___, ___, ___) \
_(IFUNCV, rbase, ___, ___, ___) \
_(JFUNCV, rbase, ___, lit, ___) \
_(FUNCC, rbase, ___, ___, ___) \
_(FUNCCW, rbase, ___, ___, ___)
/* Bytecode opcode numbers. */
typedef enum {
#define BCENUM(name, ma, mb, mc, mt) BC_##name,
BCDEF(BCENUM)
#undef BCENUM
BC__MAX
} BCOp;
LJ_STATIC_ASSERT((int)BC_ISEQV+1 == (int)BC_ISNEV);
LJ_STATIC_ASSERT(((int)BC_ISEQV^1) == (int)BC_ISNEV);
LJ_STATIC_ASSERT(((int)BC_ISEQS^1) == (int)BC_ISNES);
LJ_STATIC_ASSERT(((int)BC_ISEQN^1) == (int)BC_ISNEN);
LJ_STATIC_ASSERT(((int)BC_ISEQP^1) == (int)BC_ISNEP);
LJ_STATIC_ASSERT(((int)BC_ISLT^1) == (int)BC_ISGE);
LJ_STATIC_ASSERT(((int)BC_ISLE^1) == (int)BC_ISGT);
LJ_STATIC_ASSERT(((int)BC_ISLT^3) == (int)BC_ISGT);
LJ_STATIC_ASSERT((int)BC_IST-(int)BC_ISTC == (int)BC_ISF-(int)BC_ISFC);
LJ_STATIC_ASSERT((int)BC_CALLT-(int)BC_CALL == (int)BC_CALLMT-(int)BC_CALLM);
LJ_STATIC_ASSERT((int)BC_CALLMT + 1 == (int)BC_CALLT);
LJ_STATIC_ASSERT((int)BC_RETM + 1 == (int)BC_RET);
LJ_STATIC_ASSERT((int)BC_FORL + 1 == (int)BC_IFORL);
LJ_STATIC_ASSERT((int)BC_FORL + 2 == (int)BC_JFORL);
LJ_STATIC_ASSERT((int)BC_ITERL + 1 == (int)BC_IITERL);
LJ_STATIC_ASSERT((int)BC_ITERL + 2 == (int)BC_JITERL);
LJ_STATIC_ASSERT((int)BC_LOOP + 1 == (int)BC_ILOOP);
LJ_STATIC_ASSERT((int)BC_LOOP + 2 == (int)BC_JLOOP);
LJ_STATIC_ASSERT((int)BC_FUNCF + 1 == (int)BC_IFUNCF);
LJ_STATIC_ASSERT((int)BC_FUNCF + 2 == (int)BC_JFUNCF);
LJ_STATIC_ASSERT((int)BC_FUNCV + 1 == (int)BC_IFUNCV);
LJ_STATIC_ASSERT((int)BC_FUNCV + 2 == (int)BC_JFUNCV);
/* This solves a circular dependency problem, change as needed. */
#define FF_next_N 4
/* Stack slots used by FORI/FORL, relative to operand A. */
enum {
FORL_IDX, FORL_STOP, FORL_STEP, FORL_EXT
};
/* Bytecode operand modes. ORDER BCMode */
typedef enum {
BCMnone, BCMdst, BCMbase, BCMvar, BCMrbase, BCMuv, /* Mode A must be <= 7 */
BCMlit, BCMlits, BCMpri, BCMnum, BCMstr, BCMtab, BCMfunc, BCMjump, BCMcdata,
BCM_max
} BCMode;
#define BCM___ BCMnone
#define bcmode_a(op) ((BCMode)(lj_bc_mode[op] & 7))
#define bcmode_b(op) ((BCMode)((lj_bc_mode[op]>>3) & 15))
#define bcmode_c(op) ((BCMode)((lj_bc_mode[op]>>7) & 15))
#define bcmode_d(op) bcmode_c(op)
#define bcmode_hasd(op) ((lj_bc_mode[op] & (15<<3)) == (BCMnone<<3))
#define bcmode_mm(op) ((MMS)(lj_bc_mode[op]>>11))
#define BCMODE(name, ma, mb, mc, mm) \
(BCM##ma|(BCM##mb<<3)|(BCM##mc<<7)|(MM_##mm<<11)),
#define BCMODE_FF 0
static LJ_AINLINE int bc_isret(BCOp op)
{
return (op == BC_RETM || op == BC_RET || op == BC_RET0 || op == BC_RET1);
}
LJ_DATA const uint16_t lj_bc_mode[];
LJ_DATA const uint16_t lj_bc_ofs[];
#endif