368 lines
8.2 KiB
C++
368 lines
8.2 KiB
C++
#include "master.hpp"
|
|
|
|
namespace factor
|
|
{
|
|
|
|
THREADHANDLE start_thread(void *(*start_routine)(void *),void *args)
|
|
{
|
|
pthread_attr_t attr;
|
|
pthread_t thread;
|
|
if (pthread_attr_init (&attr) != 0)
|
|
fatal_error("pthread_attr_init() failed",0);
|
|
if (pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_JOINABLE) != 0)
|
|
fatal_error("pthread_attr_setdetachstate() failed",0);
|
|
if (pthread_create (&thread, &attr, start_routine, args) != 0)
|
|
fatal_error("pthread_create() failed",0);
|
|
pthread_attr_destroy (&attr);
|
|
return thread;
|
|
}
|
|
|
|
pthread_key_t tlsKey = 0;
|
|
|
|
void init_platform_globals()
|
|
{
|
|
if (pthread_key_create(&tlsKey, NULL) != 0)
|
|
fatal_error("pthread_key_create() failed",0);
|
|
|
|
}
|
|
|
|
void register_vm_with_thread(factor_vm *vm)
|
|
{
|
|
pthread_setspecific(tlsKey,vm);
|
|
}
|
|
|
|
factor_vm *tls_vm()
|
|
{
|
|
return (factor_vm*)pthread_getspecific(tlsKey);
|
|
}
|
|
|
|
static void *null_dll;
|
|
|
|
s64 current_micros()
|
|
{
|
|
struct timeval t;
|
|
gettimeofday(&t,NULL);
|
|
return (s64)t.tv_sec * 1000000 + t.tv_usec;
|
|
}
|
|
|
|
void sleep_micros(cell usec)
|
|
{
|
|
usleep(usec);
|
|
}
|
|
|
|
void factor_vm::init_ffi()
|
|
{
|
|
/* NULL_DLL is "libfactor.dylib" for OS X and NULL for generic unix */
|
|
null_dll = dlopen(NULL_DLL,RTLD_LAZY);
|
|
}
|
|
|
|
void factor_vm::ffi_dlopen(dll *dll)
|
|
{
|
|
dll->dll = dlopen(alien_offset(dll->path), RTLD_LAZY);
|
|
}
|
|
|
|
void *factor_vm::ffi_dlsym(dll *dll, symbol_char *symbol)
|
|
{
|
|
void *handle = (dll == NULL ? null_dll : dll->dll);
|
|
return dlsym(handle,symbol);
|
|
}
|
|
|
|
void factor_vm::ffi_dlclose(dll *dll)
|
|
{
|
|
if(dlclose(dll->dll))
|
|
general_error(ERROR_FFI,F,F,NULL);
|
|
dll->dll = NULL;
|
|
}
|
|
|
|
inline void factor_vm::primitive_existsp()
|
|
{
|
|
struct stat sb;
|
|
char *path = (char *)(untag_check<byte_array>(dpop()) + 1);
|
|
box_boolean(stat(path,&sb) >= 0);
|
|
}
|
|
|
|
PRIMITIVE_FORWARD(existsp)
|
|
|
|
segment::segment(factor_vm *myvm_, cell size_)
|
|
{
|
|
myvm = myvm_;
|
|
size = size_;
|
|
|
|
int pagesize = getpagesize();
|
|
|
|
char *array = (char *)mmap(NULL,pagesize + size + pagesize,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_ANON | MAP_PRIVATE,-1,0);
|
|
|
|
if(array == (char*)-1)
|
|
myvm->out_of_memory();
|
|
|
|
if(mprotect(array,pagesize,PROT_NONE) == -1)
|
|
fatal_error("Cannot protect low guard page",(cell)array);
|
|
|
|
if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
|
|
fatal_error("Cannot protect high guard page",(cell)array);
|
|
|
|
start = (cell)(array + pagesize);
|
|
end = start + size;
|
|
}
|
|
|
|
segment::~segment()
|
|
{
|
|
int pagesize = getpagesize();
|
|
int retval = munmap((void*)(start - pagesize),pagesize + size + pagesize);
|
|
if(retval)
|
|
fatal_error("Segment deallocation failed",0);
|
|
}
|
|
|
|
stack_frame *factor_vm::uap_stack_pointer(void *uap)
|
|
{
|
|
/* There is a race condition here, but in practice a signal
|
|
delivered during stack frame setup/teardown or while transitioning
|
|
from Factor to C is a sign of things seriously gone wrong, not just
|
|
a divide by zero or stack underflow in the listener */
|
|
if(in_code_heap_p(UAP_PROGRAM_COUNTER(uap)))
|
|
{
|
|
stack_frame *ptr = (stack_frame *)ucontext_stack_pointer(uap);
|
|
if(!ptr)
|
|
critical_error("Invalid uap",(cell)uap);
|
|
return ptr;
|
|
}
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void factor_vm::memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
|
|
{
|
|
signal_fault_addr = (cell)siginfo->si_addr;
|
|
signal_callstack_top = uap_stack_pointer(uap);
|
|
UAP_PROGRAM_COUNTER(uap) = (cell)factor::memory_signal_handler_impl;
|
|
}
|
|
|
|
void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
|
|
{
|
|
SIGNAL_VM_PTR()->memory_signal_handler(signal,siginfo,uap);
|
|
}
|
|
|
|
void factor_vm::misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
|
|
{
|
|
signal_number = signal;
|
|
signal_callstack_top = uap_stack_pointer(uap);
|
|
UAP_PROGRAM_COUNTER(uap) = (cell)factor::misc_signal_handler_impl;
|
|
}
|
|
|
|
void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
|
|
{
|
|
SIGNAL_VM_PTR()->misc_signal_handler(signal,siginfo,uap);
|
|
}
|
|
|
|
void factor_vm::fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
|
|
{
|
|
signal_number = signal;
|
|
signal_callstack_top = uap_stack_pointer(uap);
|
|
signal_fpu_status = fpu_status(uap_fpu_status(uap));
|
|
uap_clear_fpu_status(uap);
|
|
UAP_PROGRAM_COUNTER(uap) =
|
|
(siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
|
|
? (cell)factor::misc_signal_handler_impl
|
|
: (cell)factor::fp_signal_handler_impl;
|
|
}
|
|
|
|
void fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
|
|
{
|
|
SIGNAL_VM_PTR()->fpe_signal_handler(signal, siginfo, uap);
|
|
}
|
|
|
|
static void sigaction_safe(int signum, const struct sigaction *act, struct sigaction *oldact)
|
|
{
|
|
int ret;
|
|
do
|
|
{
|
|
ret = sigaction(signum, act, oldact);
|
|
}
|
|
while(ret == -1 && errno == EINTR);
|
|
|
|
if(ret == -1)
|
|
fatal_error("sigaction failed", 0);
|
|
}
|
|
|
|
void unix_init_signals()
|
|
{
|
|
struct sigaction memory_sigaction;
|
|
struct sigaction misc_sigaction;
|
|
struct sigaction fpe_sigaction;
|
|
struct sigaction ignore_sigaction;
|
|
|
|
memset(&memory_sigaction,0,sizeof(struct sigaction));
|
|
sigemptyset(&memory_sigaction.sa_mask);
|
|
memory_sigaction.sa_sigaction = memory_signal_handler;
|
|
memory_sigaction.sa_flags = SA_SIGINFO;
|
|
|
|
sigaction_safe(SIGBUS,&memory_sigaction,NULL);
|
|
sigaction_safe(SIGSEGV,&memory_sigaction,NULL);
|
|
|
|
memset(&fpe_sigaction,0,sizeof(struct sigaction));
|
|
sigemptyset(&fpe_sigaction.sa_mask);
|
|
fpe_sigaction.sa_sigaction = fpe_signal_handler;
|
|
fpe_sigaction.sa_flags = SA_SIGINFO;
|
|
|
|
sigaction_safe(SIGFPE,&fpe_sigaction,NULL);
|
|
|
|
memset(&misc_sigaction,0,sizeof(struct sigaction));
|
|
sigemptyset(&misc_sigaction.sa_mask);
|
|
misc_sigaction.sa_sigaction = misc_signal_handler;
|
|
misc_sigaction.sa_flags = SA_SIGINFO;
|
|
|
|
sigaction_safe(SIGABRT,&misc_sigaction,NULL);
|
|
sigaction_safe(SIGQUIT,&misc_sigaction,NULL);
|
|
sigaction_safe(SIGILL,&misc_sigaction,NULL);
|
|
|
|
memset(&ignore_sigaction,0,sizeof(struct sigaction));
|
|
sigemptyset(&ignore_sigaction.sa_mask);
|
|
ignore_sigaction.sa_handler = SIG_IGN;
|
|
sigaction_safe(SIGPIPE,&ignore_sigaction,NULL);
|
|
}
|
|
|
|
/* On Unix, shared fds such as stdin cannot be set to non-blocking mode
|
|
(http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
|
|
so we kludge around this by spawning a thread, which waits on a control pipe
|
|
for a signal, upon receiving this signal it reads one block of data from stdin
|
|
and writes it to a data pipe. Upon completion, it writes a 4-byte integer to
|
|
the size pipe, indicating how much data was written to the data pipe.
|
|
|
|
The read end of the size pipe can be set to non-blocking. */
|
|
extern "C" {
|
|
int stdin_read;
|
|
int stdin_write;
|
|
|
|
int control_read;
|
|
int control_write;
|
|
|
|
int size_read;
|
|
int size_write;
|
|
}
|
|
|
|
void safe_close(int fd)
|
|
{
|
|
if(close(fd) < 0)
|
|
fatal_error("error closing fd",errno);
|
|
}
|
|
|
|
bool check_write(int fd, void *data, ssize_t size)
|
|
{
|
|
if(write(fd,data,size) == size)
|
|
return true;
|
|
else
|
|
{
|
|
if(errno == EINTR)
|
|
return check_write(fd,data,size);
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void safe_write(int fd, void *data, ssize_t size)
|
|
{
|
|
if(!check_write(fd,data,size))
|
|
fatal_error("error writing fd",errno);
|
|
}
|
|
|
|
bool safe_read(int fd, void *data, ssize_t size)
|
|
{
|
|
ssize_t bytes = read(fd,data,size);
|
|
if(bytes < 0)
|
|
{
|
|
if(errno == EINTR)
|
|
return safe_read(fd,data,size);
|
|
else
|
|
{
|
|
fatal_error("error reading fd",errno);
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
return (bytes == size);
|
|
}
|
|
|
|
void *stdin_loop(void *arg)
|
|
{
|
|
unsigned char buf[4096];
|
|
bool loop_running = true;
|
|
|
|
while(loop_running)
|
|
{
|
|
if(!safe_read(control_read,buf,1))
|
|
break;
|
|
|
|
if(buf[0] != 'X')
|
|
fatal_error("stdin_loop: bad data on control fd",buf[0]);
|
|
|
|
for(;;)
|
|
{
|
|
ssize_t bytes = read(0,buf,sizeof(buf));
|
|
if(bytes < 0)
|
|
{
|
|
if(errno == EINTR)
|
|
continue;
|
|
else
|
|
{
|
|
loop_running = false;
|
|
break;
|
|
}
|
|
}
|
|
else if(bytes >= 0)
|
|
{
|
|
safe_write(size_write,&bytes,sizeof(bytes));
|
|
|
|
if(!check_write(stdin_write,buf,bytes))
|
|
loop_running = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
safe_close(stdin_write);
|
|
safe_close(control_read);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void open_console()
|
|
{
|
|
int filedes[2];
|
|
|
|
if(pipe(filedes) < 0)
|
|
fatal_error("Error opening control pipe",errno);
|
|
|
|
control_read = filedes[0];
|
|
control_write = filedes[1];
|
|
|
|
if(pipe(filedes) < 0)
|
|
fatal_error("Error opening size pipe",errno);
|
|
|
|
size_read = filedes[0];
|
|
size_write = filedes[1];
|
|
|
|
if(pipe(filedes) < 0)
|
|
fatal_error("Error opening stdin pipe",errno);
|
|
|
|
stdin_read = filedes[0];
|
|
stdin_write = filedes[1];
|
|
|
|
start_thread(stdin_loop,NULL);
|
|
}
|
|
|
|
VM_C_API void wait_for_stdin()
|
|
{
|
|
if(write(control_write,"X",1) != 1)
|
|
{
|
|
if(errno == EINTR)
|
|
wait_for_stdin();
|
|
else
|
|
fatal_error("Error writing control fd",errno);
|
|
}
|
|
}
|
|
|
|
}
|