Vanessa McHale
2023-Feb-22 22:05 UTC
[Rd] dyn.load loads libraries/symbols at high addresses.
Hello all,
I am trying to write an interface for BQN
<https://mlochbaum.github.io/BQN/> and R
However, even
|
dyn.load("/usr/local/lib/libcbqn.so"); .Call("bqn_init")|
immediately fails on the BQN side, viz.
|Failed to allocate memory for JIT 200 times; stopping trying||
||CBQN interpreter entered unexpected state, exiting.
|This is because BQN tries to allocate memory for a JIT near itself and
also in the lower 32 bits.|
u64 near = (u64)&bqn_exec;
u64 MAX_DIST = 1ULL<<30;
mmap(NULL, sz, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_NORESERVE|MAP_PRIVATE|MAP_ANONYMOUS|MAP_32BIT, -1, 0);
|However, |&bqn_exec| seems to be 0x7...||i.e. libcbqn.so is being
loaded to a high address. Why is this? Is there some way to request that
it and its symbols be loaded to lower addresses? I have never had this
happen when using dlopen and dlsym!|
|
Thanks!
Vanessa McHale|
|
[[alternative HTML version deleted]]
Tomas Kalibera
2023-Feb-23 08:48 UTC
[Rd] dyn.load loads libraries/symbols at high addresses.
On 2/22/23 23:05, Vanessa McHale wrote:> Hello all, > > I am trying to write an interface for BQN > <https://mlochbaum.github.io/BQN/> and R > > However, even > | > dyn.load("/usr/local/lib/libcbqn.so"); .Call("bqn_init")| > > immediately fails on the BQN side, viz. > > |Failed to allocate memory for JIT 200 times; stopping trying|| > ||CBQN interpreter entered unexpected state, exiting. > > |This is because BQN tries to allocate memory for a JIT near itself and > also in the lower 32 bits.| > > u64 near = (u64)&bqn_exec; > u64 MAX_DIST = 1ULL<<30; > mmap(NULL, sz, PROT_READ|PROT_WRITE|PROT_EXEC, > MAP_NORESERVE|MAP_PRIVATE|MAP_ANONYMOUS|MAP_32BIT, -1, 0); > > |However, |&bqn_exec| seems to be 0x7...||i.e. libcbqn.so is being > loaded to a high address. Why is this? Is there some way to request that > it and its symbols be loaded to lower addresses? I have never had this > happen when using dlopen and dlsym!|R doesn't do anything special here, it uses also dlopen() and dlsym() on Unix systems. I am not aware of a portable way to influence where the library gets loaded at OS level, and certainly there is no such way in R. Best Tomas> | > Thanks! > Vanessa McHale| > | > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel