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mask.go
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mask.go
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package vm
// Masks for instruction arguments.
type ArgMask uint8
const (
ArgN ArgMask = iota // argument is not used
ArgU // argument is used
ArgR // argument is a register or a jump offset
ArgK // argument is a constant or register/constant
)
// ArgMask represents masks for instruction properties.
//
// The format is:
// bits 0-1: op mode
// bits 2-3: C arg mode
// bits 4-5: B arg mode
// bit 6: instruction set register A
// bit 7: operator is a test (next instruction must be a jump)
type Mask uint8
var masks = [...]Mask{
MOVE: mask(0, 1, ArgR, ArgN, ModeABC), // MOVE
LOADK: mask(0, 1, ArgK, ArgN, ModeABx), // LOADK
LOADKX: mask(0, 1, ArgN, ArgN, ModeABx), // LOADKX
LOADBOOL: mask(0, 1, ArgU, ArgU, ModeABC), // LOADBOOL
LOADNIL: mask(0, 1, ArgU, ArgN, ModeABC), // LOADNIL
GETUPVAL: mask(0, 1, ArgU, ArgN, ModeABC), // GETUPVAL
GETTABUP: mask(0, 1, ArgU, ArgK, ModeABC), // GETTABUP
GETTABLE: mask(0, 1, ArgR, ArgK, ModeABC), // GETTABLE
SETTABUP: mask(0, 0, ArgK, ArgK, ModeABC), // SETTABUP
SETUPVAL: mask(0, 0, ArgU, ArgN, ModeABC), // SETUPVAL
SETTABLE: mask(0, 0, ArgK, ArgK, ModeABC), // SETTABLE
NEWTABLE: mask(0, 1, ArgU, ArgU, ModeABC), // NEWTABLE
SELF: mask(0, 1, ArgR, ArgK, ModeABC), // SELF
ADD: mask(0, 1, ArgK, ArgK, ModeABC), // ADD
SUB: mask(0, 1, ArgK, ArgK, ModeABC), // SUB
MUL: mask(0, 1, ArgK, ArgK, ModeABC), // MUL
MOD: mask(0, 1, ArgK, ArgK, ModeABC), // MOD
POW: mask(0, 1, ArgK, ArgK, ModeABC), // POW
DIV: mask(0, 1, ArgK, ArgK, ModeABC), // DIV
IDIV: mask(0, 1, ArgK, ArgK, ModeABC), // IDIV
BAND: mask(0, 1, ArgK, ArgK, ModeABC), // BAND
BOR: mask(0, 1, ArgK, ArgK, ModeABC), // BOR
BXOR: mask(0, 1, ArgK, ArgK, ModeABC), // BXOR
SHL: mask(0, 1, ArgK, ArgK, ModeABC), // SHL
SHR: mask(0, 1, ArgK, ArgK, ModeABC), // SHR
UNM: mask(0, 1, ArgR, ArgN, ModeABC), // UNM
BNOT: mask(0, 1, ArgR, ArgN, ModeABC), // BNOT
NOT: mask(0, 1, ArgR, ArgN, ModeABC), // NOT
LEN: mask(0, 1, ArgR, ArgN, ModeABC), // LEN
CONCAT: mask(0, 1, ArgR, ArgR, ModeABC), // CONCAT
JMP: mask(0, 0, ArgR, ArgN, ModeAsBx), // JMP
EQ: mask(1, 0, ArgK, ArgK, ModeABC), // EQ
LT: mask(1, 0, ArgK, ArgK, ModeABC), // LT
LE: mask(1, 0, ArgK, ArgK, ModeABC), // LE
TEST: mask(1, 0, ArgN, ArgU, ModeABC), // TEST
TESTSET: mask(1, 1, ArgR, ArgU, ModeABC), // TESTSET
CALL: mask(0, 1, ArgU, ArgU, ModeABC), // CALL
TAILCALL: mask(0, 1, ArgU, ArgU, ModeABC), // TAILCALL
RETURN: mask(0, 0, ArgU, ArgN, ModeABC), // RETURN
FORLOOP: mask(0, 1, ArgR, ArgN, ModeAsBx), // FORLOOP
FORPREP: mask(0, 1, ArgR, ArgN, ModeAsBx), // FORPREP
TFORCALL: mask(0, 0, ArgN, ArgU, ModeABC), // TFORCALL
TFORLOOP: mask(0, 1, ArgR, ArgN, ModeAsBx), // TFORLOOP
SETLIST: mask(0, 0, ArgU, ArgU, ModeABC), // SETLIST
CLOSURE: mask(0, 1, ArgU, ArgN, ModeABx), // CLOSURE
VARARG: mask(0, 1, ArgU, ArgN, ModeABC), // VARARG
EXTRAARG: mask(0, 0, ArgU, ArgU, ModeAx), // EXTRAARG
}
func (mask Mask) B(barg ArgMask) bool { return barg == ArgMask((mask>>4)&3) }
func (mask Mask) C(carg ArgMask) bool { return carg == ArgMask((mask>>2)&3) }
func (mask Mask) Mode() Mode { return Mode(mask & 3) }
func (mask Mask) SetA() bool { return mask&(1<<6) == 1 }
func (mask Mask) Test() bool { return mask&(1<<7) == 1 }
func mask(t, a uint8, b, c ArgMask, m Mode) Mask {
return Mask((((t) << 7) | ((a) << 6) | ((uint8(b)) << 4) | ((uint8(c)) << 2) | (uint8(m))))
}