1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
# The new bytecode
We will reimplement VM to use 8bit instruction code. By
bytecode, we mean real byte code. The whole purpose is
reducing the memory consumption of mruby VM.
# Instructions
Instructions are bytes. There can be 256 instructions. Currently we
have 94 instructions. Instructions can take 0 to 3 operands.
## operands
The size of operands can be either 8bits, 16bits or 24bits.
In the table.1 below, the second field describes the size (and
sign) of operands.
* B: 8bit
* S: 16bit
* sS: signed 16bit
* W: 24bit
First two byte operands may be extended to 16bit. When those byte
operands are bigger than 256, the instruction will be prefixed by
`OP_EXT1` (means 1st operand is 16bit) or `OP_EXT2` (means 2nd operand
is 16bit) or `OP_EXT3` (means 1st and 2nd operands are 16bit).
For instructions marked by `'`, `OP_EXT1` can be prefixed. For those
with `"`, either `OP_EXT1` or `OP_EXT2` or `OP_EXT2` can be prefixed.
## table.1 Instruction Table
| Instruction Name | Operand type | Semantics |
|------------------|--------------|--------------------------------------------------------|
| OP_NOP | - | no operation |
| OP_MOVE" | BB | R(a) = R(b) |
| OP_LOADL" | BB | R(a) = Pool(b) |
| OP_LOADI" | BB | R(a) = mrb_int(b) |
| OP_LOADINEG" | BB | R(a) = mrb_int(-b) |
| OP_LOADI__1' | B | R(a) = mrb_int(-1) |
| OP_LOADI_0' | B | R(a) = mrb_int(0) |
| OP_LOADI_1' | B | R(a) = mrb_int(1) |
| OP_LOADI_2' | B | R(a) = mrb_int(2) |
| OP_LOADI_3' | B | R(a) = mrb_int(3) |
| OP_LOADI_4' | B | R(a) = mrb_int(4) |
| OP_LOADI_5' | B | R(a) = mrb_int(5) |
| OP_LOADI_6' | B | R(a) = mrb_int(6) |
| OP_LOADI_7' | B | R(a) = mrb_int(7) |
| OP_LOADI16' | BsS | R(a) = mrb_int(b) |
| OP_LOADSYM" | BB | R(a) = Syms(b) |
| OP_LOADNIL' | B | R(a) = nil |
| OP_LOADSELF' | B | R(a) = self |
| OP_LOADT' | B | R(a) = true |
| OP_LOADF' | B | R(a) = false |
| OP_GETGV" | BB | R(a) = getglobal(Syms(b)) |
| OP_SETGV" | BB | setglobal(Syms(b), R(a)) |
| OP_GETSV" | BB | R(a) = Special[Syms(b)] |
| OP_SETSV" | BB | Special[Syms(b)] = R(a) |
| OP_GETIV" | BB | R(a) = ivget(Syms(b)) |
| OP_SETIV" | BB | ivset(Syms(b),R(a)) |
| OP_GETCV" | BB | R(a) = cvget(Syms(b)) |
| OP_SETCV" | BB | cvset(Syms(b),R(a)) |
| OP_GETCONST" | BB | R(a) = constget(Syms(b)) |
| OP_SETCONST" | BB | constset(Syms(b),R(a)) |
| OP_GETMCNST" | BB | R(a) = R(a)::Syms(b) |
| OP_SETMCNST" | BB | R(a+1)::Syms(b) = R(a) |
| OP_GETUPVAR" | BBB | R(a) = uvget(b,c) |
| OP_SETUPVAR" | BBB | uvset(b,c,R(a)) |
| OP_JMP | S | pc=a |
| OP_JMPIF' | BS | if R(a) pc=b |
| OP_JMPNOT' | BS | if !R(a) pc=b |
| OP_JMPNIL' | BS | if R(a)==nil pc=b |
| OP_ONERR | S | rescue_push(a) |
| OP_EXCEPT' | B | R(a) = exc |
| OP_RESCUE" | BB | R(b) = R(a).isa?(R(b)) |
| OP_POPERR' | B | a.times{rescue_pop()} |
| OP_RAISE' | B | raise(R(a)) |
| OP_EPUSH' | B | ensure_push(SEQ[a]) |
| OP_EPOP' | B | A.times{ensure_pop().call} |
| OP_SENDV" | BB | R(a) = call(R(a),Syms(b),*R(a+1)) |
| OP_SENDVB" | BB | R(a) = call(R(a),Syms(b),*R(a+1),&R(a+2)) |
| OP_SEND" | BBB | R(a) = call(R(a),Syms(b),R(a+1),...,R(a+c)) |
| OP_SENDB" | BBB | R(a) = call(R(a),Syms(b),R(a+1),...,R(a+c),&R(a+c+1)) |
| OP_CALL | - | R(0) = self.call(frame.argc, frame.argv) |
| OP_SUPER" | BB | R(a) = super(R(a+1),... ,R(a+b+1)) |
| OP_ARGARY' | BS | R(a) = argument array (16=5:1:5:1:4) |
| OP_ENTER | W | arg setup according to flags (23=5:5:1:5:5:1:1) |
| OP_KEY_P" | BB | R(a) = kdict.key?(Syms(b)) |
| OP_KEYEND | - | raise unless kdict.empty? |
| OP_KARG" | BB | R(a) = kdict[Syms(b)]; kdict.delete(Syms(b)) |
| OP_RETURN' | B | return R(a) (normal) |
| OP_RETURN_BLK' | B | return R(a) (in-block return) |
| OP_BREAK' | B | break R(a) |
| OP_BLKPUSH' | BS | R(a) = block (16=5:1:5:1:4) |
| OP_ADD' | B | R(a) = R(a)+R(a+1) |
| OP_ADDI" | BB | R(a) = R(a)+mrb_int(b) |
| OP_SUB' | B | R(a) = R(a)-R(a+1) |
| OP_SUBI" | BB | R(a) = R(a)-mrb_int(b) |
| OP_MUL' | B | R(a) = R(a)*R(a+1) |
| OP_DIV' | B | R(a) = R(a)/R(a+1) |
| OP_EQ' | B | R(a) = R(a)==R(a+1) |
| OP_LT' | B | R(a) = R(a)<R(a+1) |
| OP_LE' | B | R(a) = R(a)<=R(a+1) |
| OP_GT' | B | R(a) = R(a)>R(a+1) |
| OP_GE' | B | R(a) = R(a)>=R(a+1) |
| OP_ARRAY" | BB | R(a) = ary_new(R(a),R(a+1)..R(a+b)) |
| OP_ARRAY2" | BBB | R(a) = ary_new(R(b),R(b+1)..R(b+c)) |
| OP_ARYCAT' | B | ary_cat(R(a),R(a+1)) |
| OP_ARYPUSH' | B | ary_push(R(a),R(a+1)) |
| OP_ARYDUP' | B | R(a) = ary_dup(R(a)) |
| OP_AREF" | BBB | R(a) = R(b)[c] |
| OP_ASET" | BBB | R(a)[c] = R(b) |
| OP_APOST" | BBB | *R(a),R(a+1)..R(a+c) = R(a)[b..] |
| OP_INTERN' | B | R(a) = intern(R(a)) |
| OP_STRING" | BB | R(a) = str_dup(Lit(b)) |
| OP_STRCAT' | B | str_cat(R(a),R(a+1)) |
| OP_HASH" | BB | R(a) = hash_new(R(a),R(a+1)..R(a+b)) |
| OP_HASHADD" | BB | R(a) = hash_push(R(a),R(a+1)..R(a+b)) |
| OP_HASHCAT' | B | R(a) = hash_cat(R(a),R(a+1)) |
| OP_LAMBDA" | BB | R(a) = lambda(SEQ[b],OP_L_LAMBDA) |
| OP_BLOCK" | BB | R(a) = lambda(SEQ[b],OP_L_BLOCK) |
| OP_METHOD" | BB | R(a) = lambda(SEQ[b],OP_L_METHOD) |
| OP_RANGE_INC' | B | R(a) = range_new(R(a),R(a+1),FALSE) |
| OP_RANGE_EXC' | B | R(a) = range_new(R(a),R(a+1),TRUE) |
| OP_OCLASS' | B | R(a) = ::Object |
| OP_CLASS" | BB | R(a) = newclass(R(a),Syms(b),R(a+1)) |
| OP_MODULE" | BB | R(a) = newmodule(R(a),Syms(b)) |
| OP_EXEC" | BB | R(a) = blockexec(R(a),SEQ[b]) |
| OP_DEF" | BB | R(a).newmethod(Syms(b),R(a+1)) |
| OP_ALIAS" | BB | alias_method(target_class,Syms(a),Syms(b)) |
| OP_UNDEF' | B | undef_method(target_class,Syms(a)) |
| OP_SCLASS' | B | R(a) = R(a).singleton_class |
| OP_TCLASS' | B | R(a) = target_class |
| OP_DEBUG" | BBB | print a,b,c |
| OP_ERR' | B | raise(LocalJumpError, Lit(a)) |
| OP_EXT1 | - | make 1st operand 16bit |
| OP_EXT2 | - | make 2nd operand 16bit |
| OP_EXT3 | - | make 1st and 2nd operands 16bit |
| OP_STOP | - | stop VM |
|------------------|--------------|--------------------------------------------------------|
|
