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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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