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1/*
2** Bytecode instruction format.
3** Copyright (C) 2005-2009 Mike Pall. See Copyright Notice in luajit.h
4*/
5
6#ifndef _LJ_BC_H
7#define _LJ_BC_H
8
9#include "lj_def.h"
10#include "lj_arch.h"
11
12/* Bytecode instruction format, 32 bit wide, fields of 8 or 16 bit:
13**
14** +----+----+----+----+
15** | B | C | A | OP | Format ABC
16** +----+----+----+----+
17** | D | A | OP | Format AD
18** +--------------------
19** MSB LSB
20**
21** In-memory instructions are always stored in host byte order.
22*/
23
24/* Operand ranges and related constants. */
25#define BCMAX_A 0xff
26#define BCMAX_B 0xff
27#define BCMAX_C 0xff
28#define BCMAX_D 0xffff
29#define BCBIAS_J 0x8000
30#define NO_REG BCMAX_A
31#define NO_JMP (~(BCPos)0)
32
33/* Macros to get instruction fields. */
34#define bc_op(i) (cast(BCOp, (i)&0xff))
35#define bc_a(i) (cast(BCReg, ((i)>>8)&0xff))
36#define bc_b(i) (cast(BCReg, (i)>>24))
37#define bc_c(i) (cast(BCReg, ((i)>>16)&0xff))
38#define bc_d(i) (cast(BCReg, (i)>>16))
39#define bc_j(i) ((ptrdiff_t)bc_d(i)-BCBIAS_J)
40
41/* Macros to set instruction fields. */
42#define setbc_byte(p, x, ofs) \
43 ((uint8_t *)(p))[LJ_ENDIAN_SELECT(ofs, 3-ofs)] = cast_byte(x)
44#define setbc_op(p, x) setbc_byte(p, (x), 0)
45#define setbc_a(p, x) setbc_byte(p, (x), 1)
46#define setbc_b(p, x) setbc_byte(p, (x), 3)
47#define setbc_c(p, x) setbc_byte(p, (x), 2)
48#define setbc_d(p, x) \
49 ((uint16_t *)(p))[LJ_ENDIAN_SELECT(1, 0)] = cast(uint16_t, (x))
50#define setbc_j(p, x) setbc_d(p, (BCPos)((int32_t)(x)+BCBIAS_J))
51
52/* Macros to compose instructions. */
53#define BCINS_ABC(o, a, b, c) \
54 (cast(BCIns, o)|(cast(BCIns, a)<<8)|\
55 (cast(BCIns, b)<<24)|(cast(BCIns, c)<<16))
56#define BCINS_AD(o, a, d) \
57 (cast(BCIns, o)|(cast(BCIns, a)<<8)|(cast(BCIns, d)<<16))
58#define BCINS_AJ(o, a, j) BCINS_AD(o, a, (BCPos)((int32_t)(j)+BCBIAS_J))
59
60/* Bytecode instruction definition. Order matters, see below.
61**
62** (name, filler, Amode, Bmode, Cmode or Dmode, metamethod)
63**
64** The opcode name suffixes specify the type for RB/RC or RD:
65** V = variable slot
66** S = string const
67** N = number const
68** P = primitive type (~itype)
69** B = unsigned byte literal
70** M = multiple args/results
71*/
72#define BCDEF(_) \
73 /* Comparison ops. ORDER OPR. */ \
74 _(ISLT, var, ___, var, lt) \
75 _(ISGE, var, ___, var, lt) \
76 _(ISLE, var, ___, var, le) \
77 _(ISGT, var, ___, var, le) \
78 \
79 _(ISEQV, var, ___, var, eq) \
80 _(ISNEV, var, ___, var, eq) \
81 _(ISEQS, var, ___, str, eq) \
82 _(ISNES, var, ___, str, eq) \
83 _(ISEQN, var, ___, num, eq) \
84 _(ISNEN, var, ___, num, eq) \
85 _(ISEQP, var, ___, pri, eq) \
86 _(ISNEP, var, ___, pri, eq) \
87 \
88 /* Unary test and copy ops. */ \
89 _(ISTC, dst, ___, var, ___) \
90 _(ISFC, dst, ___, var, ___) \
91 _(IST, ___, ___, var, ___) \
92 _(ISF, ___, ___, var, ___) \
93 \
94 /* Unary ops. */ \
95 _(MOV, dst, ___, var, ___) \
96 _(NOT, dst, ___, var, ___) \
97 _(UNM, dst, ___, var, unm) \
98 _(LEN, dst, ___, var, len) \
99 \
100 /* Binary ops. ORDER OPR. VV last, POW must be next. */ \
101 _(ADDVN, dst, var, num, add) \
102 _(SUBVN, dst, var, num, sub) \
103 _(MULVN, dst, var, num, mul) \
104 _(DIVVN, dst, var, num, div) \
105 _(MODVN, dst, var, num, mod) \
106 \
107 _(ADDNV, dst, var, num, add) \
108 _(SUBNV, dst, var, num, sub) \
109 _(MULNV, dst, var, num, mul) \
110 _(DIVNV, dst, var, num, div) \
111 _(MODNV, dst, var, num, mod) \
112 \
113 _(ADDVV, dst, var, var, add) \
114 _(SUBVV, dst, var, var, sub) \
115 _(MULVV, dst, var, var, mul) \
116 _(DIVVV, dst, var, var, div) \
117 _(MODVV, dst, var, var, mod) \
118 \
119 _(POW, dst, var, var, pow) \
120 _(CAT, dst, rbase, rbase, concat) \
121 \
122 /* Constant ops. */ \
123 _(KSTR, dst, ___, str, ___) \
124 _(KSHORT, dst, ___, lits, ___) \
125 _(KNUM, dst, ___, num, ___) \
126 _(KPRI, dst, ___, pri, ___) \
127 _(KNIL, base, ___, base, ___) \
128 \
129 /* Upvalue and function ops. */ \
130 _(UGET, dst, ___, uv, ___) \
131 _(USETV, uv, ___, var, ___) \
132 _(USETS, uv, ___, str, ___) \
133 _(USETN, uv, ___, num, ___) \
134 _(USETP, uv, ___, pri, ___) \
135 _(UCLO, rbase, ___, jump, ___) \
136 _(FNEW, dst, ___, func, gc) \
137 \
138 /* Table ops. */ \
139 _(TNEW, dst, ___, lit, gc) \
140 _(TDUP, dst, ___, tab, gc) \
141 _(GGET, dst, ___, str, index) \
142 _(GSET, var, ___, str, newindex) \
143 _(TGETV, dst, var, var, index) \
144 _(TGETS, dst, var, str, index) \
145 _(TGETB, dst, var, lit, index) \
146 _(TSETV, var, var, var, newindex) \
147 _(TSETS, var, var, str, newindex) \
148 _(TSETB, var, var, lit, newindex) \
149 _(TSETM, base, ___, num, newindex) \
150 \
151 /* Calls and vararg handling. T = tail call. */ \
152 _(CALLM, base, lit, lit, call) \
153 _(CALL, base, lit, lit, call) \
154 _(CALLMT, base, ___, lit, call) \
155 _(CALLT, base, ___, lit, call) \
156 _(ITERC, base, lit, lit, call) \
157 _(VARG, base, lit, lit, ___) \
158 \
159 /* Returns. */ \
160 _(RETM, base, ___, lit, ___) \
161 _(RET, rbase, ___, lit, ___) \
162 _(RET0, rbase, ___, lit, ___) \
163 _(RET1, rbase, ___, lit, ___) \
164 \
165 /* Loops and branches. I/J = interp/JIT, I/C/L = init/call/loop. */ \
166 _(FORI, base, ___, jump, ___) \
167 _(JFORI, base, ___, jump, ___) \
168 \
169 _(FORL, base, ___, jump, ___) \
170 _(IFORL, base, ___, jump, ___) \
171 _(JFORL, base, ___, lit, ___) \
172 \
173 _(ITERL, base, ___, jump, ___) \
174 _(IITERL, base, ___, jump, ___) \
175 _(JITERL, base, ___, lit, ___) \
176 \
177 _(LOOP, rbase, ___, jump, ___) \
178 _(ILOOP, rbase, ___, jump, ___) \
179 _(JLOOP, rbase, ___, lit, ___) \
180 \
181 _(JMP, rbase, ___, jump, ___)
182
183/* Bytecode opcode numbers. */
184typedef enum {
185#define BCENUM(name, ma, mb, mc, mt) BC_##name,
186BCDEF(BCENUM)
187#undef BCENUM
188 BC__MAX
189} BCOp;
190
191LJ_STATIC_ASSERT((int)BC_ISEQV+1 == (int)BC_ISNEV);
192LJ_STATIC_ASSERT(((int)BC_ISEQV^1) == (int)BC_ISNEV);
193LJ_STATIC_ASSERT(((int)BC_ISEQS^1) == (int)BC_ISNES);
194LJ_STATIC_ASSERT(((int)BC_ISEQN^1) == (int)BC_ISNEN);
195LJ_STATIC_ASSERT(((int)BC_ISEQP^1) == (int)BC_ISNEP);
196LJ_STATIC_ASSERT(((int)BC_ISLT^1) == (int)BC_ISGE);
197LJ_STATIC_ASSERT(((int)BC_ISLE^1) == (int)BC_ISGT);
198LJ_STATIC_ASSERT(((int)BC_ISLT^3) == (int)BC_ISGT);
199LJ_STATIC_ASSERT((int)BC_IST-(int)BC_ISTC == (int)BC_ISF-(int)BC_ISFC);
200LJ_STATIC_ASSERT((int)BC_CALLT-(int)BC_CALL == (int)BC_CALLMT-(int)BC_CALLM);
201LJ_STATIC_ASSERT((int)BC_CALLMT + 1 == (int)BC_CALLT);
202LJ_STATIC_ASSERT((int)BC_RETM + 1 == (int)BC_RET);
203LJ_STATIC_ASSERT((int)BC_FORL + 1 == (int)BC_IFORL);
204LJ_STATIC_ASSERT((int)BC_FORL + 2 == (int)BC_JFORL);
205LJ_STATIC_ASSERT((int)BC_ITERL + 1 == (int)BC_IITERL);
206LJ_STATIC_ASSERT((int)BC_ITERL + 2 == (int)BC_JITERL);
207LJ_STATIC_ASSERT((int)BC_LOOP + 1 == (int)BC_ILOOP);
208LJ_STATIC_ASSERT((int)BC_LOOP + 2 == (int)BC_JLOOP);
209
210/* Stack slots used by FORI/FORL, relative to operand A. */
211enum {
212 FORL_IDX, FORL_STOP, FORL_STEP, FORL_EXT
213};
214
215/* Bytecode operand modes. ORDER BCMode */
216typedef enum {
217 BCMnone, BCMdst, BCMbase, BCMvar, BCMrbase, BCMuv, /* Mode A must be <= 7 */
218 BCMlit, BCMlits, BCMpri, BCMnum, BCMstr, BCMtab, BCMfunc, BCMjump,
219 BCM_max
220} BCMode;
221#define BCM___ BCMnone
222
223#define bcmode_a(op) (cast(BCMode, lj_bc_mode[op] & 7))
224#define bcmode_b(op) (cast(BCMode, (lj_bc_mode[op]>>3) & 15))
225#define bcmode_c(op) (cast(BCMode, (lj_bc_mode[op]>>7) & 15))
226#define bcmode_d(op) bcmode_c(op)
227#define bcmode_hasd(op) ((lj_bc_mode[op] & (15<<3)) == (BCMnone<<3))
228#define bcmode_mm(op) (cast(MMS, lj_bc_mode[op]>>11))
229
230#define BCMODE(name, ma, mb, mc, mm) \
231 (BCM##ma|(BCM##mb<<3)|(BCM##mc<<7)|(MM_##mm<<11)),
232
233LJ_DATA const uint16_t lj_bc_mode[BC__MAX+1];
234
235#endif
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