Joshua Gatcomb wrote:
I am not sure where to go from here. Any suggestions?
Ok, here is a sample debugging session:
$ cat hello.pasm
print "hello\n"
end
$ parrot hello.pasm
hello
$ gdb parrot
...
(gdb) b new_pmc_header
(gdb) r hello.pasm
Breakpoint 1, new_pmc_header (interpreter=0x82e5668, flags=1024)
at src/headers.c:244
244 pool = flags & PObj_constant_FLAG ?
(gdb) n
(gdb) n
249 if (flags & PObj_is_PMC_EXT_FLAG) {
(gdb) p *pool
...
(gdb) p *pool->last_Arena
...
(gdb) n
251 *((Dead_PObj*)pmc)->arena_dod_flag_ptr |=
(gdb) n
256 pmc->pmc_ext = new_pmc_ext(interpreter);
(gdb)
When it passes the first few times without problems then you could disable
the breakpoint:
(gdb) dis 1
and continue until the program fails:
(gdb) c
Then (p)rint again *pool, pmc, *pmc, *pool->last_Arena.
PMCs are taken from the free_list which points to the end of the arena:
(gdb) p pmc
$9 = (PMC *) 0x40b0c018
(gdb) c
(gdb) n
(gdb) n
(gdb) p pmc
the next one is at old - 0x18:
$10 = (PMC *) 0x40b0c000
(gdb) p sizeof(PMC)
$11 = 24
(gdb) p /x sizeof(PMC)
$12 = 0x18
(gdb)
(gdb) p *pool
$15 = {last_Arena = 0x40b00000, object_size = 24,
objects_per_alloc = 21843, total_objects = 2048, num_free_objects = 2046,
skip = 0, replenish_level = 614, free_list = 0x40b0bfe8 ...
(gdb) p *(PMC*)pool->free_list
...
(gdb) p *(Dead_PObj*)pmc
$17 = {free_list_ptr = 0x40b0bfe8, object_buflen_dont_use = 0,
object_flags_dont_use = 0, arena_dod_flag_ptr = 0x82f0f04,
flag_shift = 24}
The arena_dod_flag_ptr must point somewhere into arena->dod_flags.
Actual adresses will of course differ.
leo
