void* alloc() {
if (free_chunks.empty()) {
int protection = PROT_READ | PROT_WRITE | PROT_EXEC;
int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT;
char* addr = (char*)mmap(NULL, region_size, protection, flags, -1, 0);
for (int i = 0; i < region_size / chunk_size; ++i) {
free_chunks.push_back(&addr[i * chunk_size]);
}
}
return free_chunks.pop_back_val();
}
SILBasicBlock *pop_back_val() { return ToHandle.pop_back_val(); }