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lua 5.3 字节码指令手册

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

原文

寄存器

Instruction Notation

R(A)
Register A (specified in instruction field A)
R(B)
Register B (specified in instruction field B)
R(C)
Register C (specified in instruction field C)
PC
Program Counter
Kst(n)
Element n in the constant list
Upvalue[n]
Name of upvalue with index n
Gbl[sym]
Global variable indexed by symbol sym
RK(B)
Register B or a constant index
RK(C)
Register C or a constant index
sBx
Signed displacement (in field sBx) for all kinds of jumps

Instruction Summary

Lua bytecode instructions are 32-bits in size. All instructions have an opcode in the first 6 bits. Instructions can have the following fields:

'A' : 8 bits
'B' : 9 bits
'C' : 9 bits
'Ax' : 26 bits ('A', 'B', and 'C' together)
'Bx' : 18 bits ('B' and 'C' together)
'sBx' : signed Bx

A signed argument is represented in excess K; that is, the number value is the unsigned value minus K. K is exactly the maximum value for that argument (so that -max is represented by 0, and +max is represented by 2*max), which is half the maximum for the corresponding unsigned argument.

操作码

Opcode Description
MOVE Copy a value between registers
LOADK Load a constant into a register
LOADKX Load a constant into a register
LOADBOOL Load a boolean into a register
LOADNIL Load nil values into a range of registers
GETUPVAL Read an upvalue into a register
GETTABUP Read a value from table in up-value into a register
GETTABLE Read a table element into a register
SETTABUP Write a register value into table in up-value
SETUPVAL Write a register value into an upvalue
SETTABLE Write a register value into a table element
NEWTABLE Create a new table
SELF Prepare an object method for calling
ADD Addition operator
SUB Subtraction operator
MUL Multiplication operator
MOD Modulus (remainder) operator
POW Exponentation operator
DIV Division operator
IDIV Integer division operator
BAND Bit-wise AND operator
BOR Bit-wise OR operator
BXOR Bit-wise Exclusive OR operator
SHL Shift bits left
SHR Shift bits right
UNM Unary minus
BNOT Bit-wise NOT operator
NOT Logical NOT operator
LEN Length operator
CONCAT Concatenate a range of registers
JMP Unconditional jump
EQ Equality test, with conditional jump
LT Less than test, with conditional jump
LE Less than or equal to test, with conditional jump
TEST Boolean test, with conditional jump
TESTSET Boolean test, with conditional jump and assignment
CALL Call a closure
TAILCALL Perform a tail call
RETURN Return from function call
FORLOOP Iterate a numeric for loop
FORPREP Initialization for a numeric for loop
TFORLOOP Iterate a generic for loop
TFORCALL Initialization for a generic for loop
SETLIST Set a range of array elements for a table
CLOSURE Create a closure of a function prototype
VARARG Assign vararg function arguments to registers

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