Re: precompiling lua script problem

[Peter Shook <pshook@...>]

Shelby Hubick wrote:
> In our game we procompile all of our lua scripts using luac.exe (offline) before running the game. In doing this we noticed a problem where lua will believe a table is nil when indexed if it contains more than 64 entries. When running the game with the regular lua text files it works fine. 
> So it seems that precompiling the file causes the file to execute differently... does anyone know anything about this? As a temporary fix we may have to split all of our large tables into chunks of less than 64 entries and/or fallback to using text files.

Interesting problem.

Are the lost values array values or hash values?

Did you change MAXSTACK on either the host or the target?

MAXSTACK = 250 and LFIELDS_PER_FLUSH = 62  by default on my PC.

Note the "SETLIST 0 62" in the output of luac below.  This opcode copies 
all the table values on the stack into the table.

In the following simple example, luaM_realloc is not called while the 
table is being filled in.  Does this simple example work on your system?

$ cat y.lua
y = {
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,
}
print(y)
for n,v in y do print(n,v) end

$ bin/luac -p -l y.lua

main <0:@y.lua> (80 instructions/320 bytes at 0xa0408c0)
0 params, 63 stacks, 3 locals, 2 strings, 0 numbers, 0 functions, 10 lines
     1  [1]     CREATETABLE     65
     2  [2]     PUSHINT         1
     3  [2]     PUSHINT         2
     4  [2]     PUSHINT         3
     5  [2]     PUSHINT         4
     6  [2]     PUSHINT         5
     7  [2]     PUSHINT         6
     8  [2]     PUSHINT         7
     9  [2]     PUSHINT         8
    10  [2]     PUSHINT         9
    11  [2]     PUSHINT         10
    12  [2]     PUSHINT         11
    13  [2]     PUSHINT         12
    14  [2]     PUSHINT         13
    15  [2]     PUSHINT         14
    16  [2]     PUSHINT         15
    17  [2]     PUSHINT         16
    18  [3]     PUSHINT         17
    19  [3]     PUSHINT         18
    20  [3]     PUSHINT         19
    21  [3]     PUSHINT         20
    22  [3]     PUSHINT         21
    23  [3]     PUSHINT         22
    24  [3]     PUSHINT         23
    25  [3]     PUSHINT         24
    26  [3]     PUSHINT         25
    27  [3]     PUSHINT         26
    28  [3]     PUSHINT         27
    29  [3]     PUSHINT         28
    30  [3]     PUSHINT         29
    31  [3]     PUSHINT         30
    32  [3]     PUSHINT         31
    33  [3]     PUSHINT         32
    34  [4]     PUSHINT         33
    35  [4]     PUSHINT         34
    36  [4]     PUSHINT         35
    37  [4]     PUSHINT         36
    38  [4]     PUSHINT         37
    39  [4]     PUSHINT         38
    40  [4]     PUSHINT         39
    41  [4]     PUSHINT         40
    42  [4]     PUSHINT         41
    43  [4]     PUSHINT         42
    44  [4]     PUSHINT         43
    45  [4]     PUSHINT         44
    46  [4]     PUSHINT         45
    47  [4]     PUSHINT         46
    48  [4]     PUSHINT         47
    49  [4]     PUSHINT         48
    50  [5]     PUSHINT         49
    51  [5]     PUSHINT         50
    52  [5]     PUSHINT         51
    53  [5]     PUSHINT         52
    54  [5]     PUSHINT         53
    55  [5]     PUSHINT         54
    56  [5]     PUSHINT         55
    57  [5]     PUSHINT         56
    58  [5]     PUSHINT         57
    59  [5]     PUSHINT         58
    60  [5]     PUSHINT         59
    61  [5]     PUSHINT         60
    62  [5]     PUSHINT         61
    63  [5]     PUSHINT         62
    64  [5]     SETLIST         0 62
    65  [5]     PUSHINT         63
    66  [5]     PUSHINT         64
    67  [6]     PUSHINT         65
    68  [6]     SETLIST         1 3
    69  [7]     SETGLOBAL       0       ; y
    70  [8]     GETGLOBAL       1       ; print
    71  [8]     GETGLOBAL       0       ; y
    72  [8]     CALL            0 0
    73  [9]     GETGLOBAL       0       ; y
    74  [9]     LFORPREP        5       ; to 80
    75  [9]     GETGLOBAL       1       ; print
    76  [9]     GETLOCAL        1       ; n
    77  [9]     GETLOCAL        2       ; v
    78  [9]     CALL            3 0
    79  [9]     LFORLOOP        -5      ; to 75
    80  [9]     END