估算lua内存大小

1
2
3
4
5
6
7
8
9
local function getMem()
	return  collectgarbage("count")
end
collectgarbage("stop")
local before = getMem()
local a = {}
local after = getMem()
print("using mem“, (after-before)*1024)

1
2
3
4
5
6
7
8
9
10
11
12
typedef struct Table {
	CommonHeader;					//-6bit
	lu_byte falgs;					//-1bit
	lu_byte lsizenode;				//-1bit
	struct Table *metatable;		//-4bit
	TValue *array;					//-4bit
	Node *node;					    //-4bit
	Node *lastfree; 				//-4bit
	GCObject *gclist;       		//-4bit
	int sizearray;               	//-4bit
}Table;

1
2
#define CommonHeader   GCObject* next; lu_byte tt; lu_byte marked;

1
2
typedef unsigned char lu_byte;

1
2
3
4
5
6
7
8
9
10
11
12
13
typedef union {
	GCObject *gc;
	void *p;
	lua_Number n;
	int b;
} Value;

#define TValuefileds Value value; int tt

typedef struct lua_TValue {
	TValuefields;
} TValue;

1
2
3
4
5
6
7
8
9
10
11
12
13
typedef union TKey {
	struct {
		Tvaluefileds;
		struct Node *next;
	}nk;
	Tvalue tvk
} TKey;

typedef struct Node {
	TValue i_val;
	TKey i_key;
} Node;

1
2
3
local a= {0}
local b = { [0] = 0 }