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ikarus/bin/ikarus-runtime.c

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#include "ikarus.h"
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <assert.h>
#include <uuid/uuid.h>
int total_allocated_pages = 0;
#define segment_size (pagesize*pagesize/wordsize)
#define segment_shift (pageshift+pageshift-wordshift)
#define segment_index(x) (((unsigned int)(x)) >> segment_shift)
static void
extend_table_maybe(unsigned char*p, int size, ikpcb* pcb){
assert(size == align_to_next_page(size));
unsigned char* q = p + size;
if(p < pcb->memory_base){
int new_lo = segment_index(p);
int old_lo = segment_index(pcb->memory_base);
int hi = segment_index(pcb->memory_end);
int new_vec_size = (hi - new_lo) * pagesize;
int old_vec_size = (hi - old_lo) * pagesize;
unsigned char* v = ik_mmap(new_vec_size);
bzero(v, new_vec_size - old_vec_size);
memcpy(v+new_vec_size-old_vec_size, pcb->dirty_vector_base, old_vec_size);
ik_munmap(pcb->dirty_vector_base, old_vec_size);
pcb->dirty_vector_base = (unsigned int*) v;
pcb->dirty_vector = (unsigned int*)(v - new_lo * pagesize);
unsigned char* s = ik_mmap(new_vec_size);
bzero(s, new_vec_size - old_vec_size);
memcpy(s+new_vec_size-old_vec_size, pcb->segment_vector_base, old_vec_size);
ik_munmap(pcb->segment_vector_base, old_vec_size);
pcb->segment_vector_base = (unsigned int*) s;
pcb->segment_vector = (unsigned int*)(s - new_lo * pagesize);
pcb->memory_base = (unsigned char*)(new_lo * segment_size);
}
else if (q > pcb->memory_end){
int lo = segment_index(pcb->memory_base);
int old_hi = segment_index(pcb->memory_end);
int new_hi = segment_index(q+segment_size-1);
int new_vec_size = (new_hi - lo) * pagesize;
int old_vec_size = (old_hi - lo) * pagesize;
unsigned char* v = ik_mmap(new_vec_size);
memcpy(v, pcb->dirty_vector_base, old_vec_size);
bzero(v+old_vec_size, new_vec_size - old_vec_size);
ik_munmap(pcb->dirty_vector_base, old_vec_size);
pcb->dirty_vector_base = (unsigned int*) v;
pcb->dirty_vector = (unsigned int*)(v - lo * pagesize);
unsigned char* s = ik_mmap(new_vec_size);
memcpy(s, pcb->segment_vector_base, old_vec_size);
bzero(s+old_vec_size, new_vec_size - old_vec_size);
ik_munmap(pcb->segment_vector_base, old_vec_size);
pcb->segment_vector_base = (unsigned int*) s;
pcb->segment_vector = (unsigned int*)(s - lo * pagesize);
pcb->memory_end = (unsigned char*)(new_hi * segment_size);
}
}
static void
set_segment_type(unsigned char* base, int size, unsigned int type, ikpcb* pcb){
assert(base >= pcb->memory_base);
assert((base+size) <= pcb->memory_end);
assert(size == align_to_next_page(size));
unsigned int* p = pcb->segment_vector + page_index(base);
unsigned int* q = p + page_index(size);
while(p < q){
*p = type;
p++;
}
}
void
ik_munmap_from_segment(unsigned char* base, int size, ikpcb* pcb){
assert(base >= pcb->memory_base);
assert((base+size) <= pcb->memory_end);
assert(size == align_to_next_page(size));
unsigned int* p = pcb->segment_vector + page_index(base);
unsigned int* s = pcb->dirty_vector + page_index(base);
unsigned int* q = p + page_index(size);
while(p < q){
assert(*p != hole_mt);
*p = hole_mt; /* holes */
*s = 0;
p++; s++;
}
ikpage* r = pcb->uncached_pages;
if (r){
ikpage* cache = pcb->cached_pages;
do{
r->base = base;
ikpage* next = r->next;
r->next = cache;
cache = r;
r = next;
base += pagesize;
size -= pagesize;
} while(r && size);
pcb->cached_pages = cache;
pcb->uncached_pages = r;
}
if(size){
ik_munmap(base, size);
}
}
void*
ik_mmap_typed(int size, unsigned int type, ikpcb* pcb){
unsigned char* p;
if(size == pagesize) {
ikpage* s = pcb->cached_pages;
if(s){
p = s->base;
pcb->cached_pages = s->next;
s->next = pcb->uncached_pages;
pcb->uncached_pages = s;
}
else {
p = ik_mmap(size);
}
}
else {
p = ik_mmap(size);
}
extend_table_maybe(p, size, pcb);
set_segment_type(p, size, type, pcb);
return p;
}
void*
ik_mmap_ptr(int size, int gen, ikpcb* pcb){
return ik_mmap_typed(size, pointers_mt | gen, pcb);
}
void*
ik_mmap_data(int size, int gen, ikpcb* pcb){
return ik_mmap_typed(size, data_mt | gen, pcb);
}
void*
ik_mmap_code(int size, int gen, ikpcb* pcb){
ikp p = ik_mmap_typed(size, code_mt | gen, pcb);
if(size > pagesize){
set_segment_type(p+pagesize, size-pagesize, data_mt|gen, pcb);
}
int err = mprotect(p, size, PROT_READ | PROT_WRITE | PROT_EXEC);
if(err){
fprintf(stderr, "cannot mprotect code: %s\n", strerror(errno));
exit(-1);
}
return p;
}
void*
ik_mmap_mixed(int size, ikpcb* pcb){
return ik_mmap_typed(size, mainheap_mt, pcb);
}
void*
ik_mmap(int size){
int pages = (size + pagesize - 1) / pagesize;
total_allocated_pages += pages;
int mapsize = pages * pagesize;
assert(size == mapsize);
char* mem = mmap(
0,
mapsize,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
-1,
0);
if(mem == MAP_FAILED){
fprintf(stderr, "Mapping failed: %s\n", strerror(errno));
exit(-1);
}
memset(mem, -1, mapsize);
return mem;
}
void
ik_munmap(void* mem, int size){
int pages = (size + pagesize - 1) / pagesize;
int mapsize = pages * pagesize;
assert(size == mapsize);
assert(((-pagesize) & (int)mem) == (int)mem);
//int err = mprotect(mem, mapsize, PROT_NONE);
//if(err != 0){
// fprintf(stderr, "error protecting unmapped pages\n");
// exit(-1);
//}
total_allocated_pages -= pages;
int err = munmap(mem, mapsize);
if(err != 0){
fprintf(stderr, "ik_munmap failed: %s\n", strerror(errno));
exit(-1);
}
}
int total_malloced = 0;
void*
ik_malloc(int size){
void* x = malloc(size);
if(x == NULL){
fprintf(stderr, "malloc failed: %s\n", strerror(errno));
exit(-1);
}
total_malloced += size;
return x;
}
void ik_free(void* x, int size){
total_malloced -= size;
free(x);
}
ikp ik_mmap_protected(int size){
ikp x = ik_mmap(size + 2*pagesize);
{
int err = mprotect(x, pagesize, PROT_NONE);
if(err){
fprintf(stderr, "mprotect failed: %s\n", strerror(errno));
exit(-1);
}
}
{
int err = mprotect(x+pagesize+size, pagesize, PROT_NONE);
if(err){
fprintf(stderr, "mprotect failed: %s\n", strerror(errno));
exit(-1);
}
}
return x+pagesize;
}
#define CACHE_SIZE (pagesize * 8) /* must be multiple of pagesize*/
ikpcb* ik_make_pcb(){
ikpcb* pcb = ik_malloc(sizeof(ikpcb));
bzero(pcb, sizeof(ikpcb));
#define HEAPSIZE (1024 * 4096)
#define STAKSIZE (1024 * 4096)
//#define STAKSIZE (256 * 4096)
pcb->heap_base = ik_mmap_protected(HEAPSIZE);
pcb->heap_size = HEAPSIZE;
pcb->allocation_pointer = pcb->heap_base;
pcb->allocation_redline = pcb->heap_base + HEAPSIZE - 2 * 4096;
pcb->stack_base = ik_mmap(STAKSIZE);
pcb->stack_size = STAKSIZE;
pcb->frame_pointer = pcb->stack_base + pcb->stack_size;
pcb->frame_base = pcb->frame_pointer;
pcb->frame_redline = pcb->stack_base + 2 * 4096;
{ /* make cache ikpage */
ikpage* p = ik_mmap(CACHE_SIZE * sizeof(ikpage));
ikpage* q = 0;
ikpage* e = p + CACHE_SIZE;
while(p < e){
p->next = q;
q = p;
p++;
}
pcb->uncached_pages = q;
}
{
/* compute extent of heap and stack */
unsigned char* lo_mem;
unsigned char* hi_mem;
if(pcb->heap_base < pcb->stack_base){
lo_mem = pcb->heap_base - pagesize;
hi_mem = pcb->stack_base + pcb->stack_size + pagesize;
} else {
lo_mem = pcb->stack_base - pagesize;
hi_mem = pcb->heap_base + pcb->heap_size + pagesize;
}
int lo_seg = segment_index(lo_mem);
int hi_seg = segment_index(hi_mem+segment_size-1);
int vec_size = (hi_seg - lo_seg) * pagesize;
char* dvec = ik_mmap(vec_size);
bzero(dvec, vec_size);
pcb->dirty_vector_base = (unsigned int*) (dvec);
pcb->dirty_vector = (unsigned int*) (dvec - lo_seg * pagesize);
char* svec = ik_mmap(vec_size);
bzero(svec, vec_size);
pcb->segment_vector_base = (unsigned int*) (svec);
pcb->segment_vector = (unsigned int*) (svec - lo_seg * pagesize);
pcb->memory_base = (unsigned char*)(lo_seg * segment_size);
pcb->memory_end = (unsigned char*)(hi_seg * segment_size);
set_segment_type(pcb->heap_base-pagesize,
pcb->heap_size+2*pagesize,
mainheap_mt,
pcb);
set_segment_type(pcb->stack_base,
pcb->stack_size,
mainstack_mt,
pcb);
}
/* initialize base rtd */
{
ikp s = ik_cstring_to_symbol("$base-rtd", pcb);
ikp r = ik_alloc(pcb, align(rtd_size)) + rtd_tag;
ref(r, off_rtd_rtd) = r;
ref(r, off_rtd_length) = (ikp) (rtd_size-wordsize);
ref(r, off_rtd_name) = 0;
ref(r, off_rtd_fields) = 0;
ref(r, off_rtd_printer) = 0;
ref(r, off_rtd_symbol) = 0;
ref(s, off_symbol_system_value) = r;
ref(s, off_symbol_value) = r;
}
return pcb;
}
void ik_delete_pcb(ikpcb* pcb){
unsigned char* base = pcb->memory_base;
unsigned char* end = pcb->memory_end;
unsigned int* segment_vec = pcb->segment_vector;
int i = page_index(base);
int j = page_index(end);
while(i < j){
unsigned int t = segment_vec[i];
if(t != hole_mt){
ik_munmap((ikp)(i<<pageshift), pagesize);
}
i++;
}
int vecsize = (segment_index(end) - segment_index(base)) * pagesize;
ik_munmap(pcb->dirty_vector_base, vecsize);
ik_munmap(pcb->segment_vector_base, vecsize);
ik_free(pcb, sizeof(ikpcb));
}
ikp
ik_alloc(ikpcb* pcb, int size){
assert(size == align(size));
ikp ap = pcb->allocation_pointer;
ikp ep = pcb->heap_base + pcb->heap_size;
ikp nap = ap + size;
if(nap < ep){
pcb->allocation_pointer = nap;
return ap;
}
else {
if(ap){
ikpages* p = ik_malloc(sizeof(ikpages));
p->base = pcb->heap_base;
p->size = pcb->heap_size;
p->next = pcb->heap_pages;
pcb->heap_pages = p;
}
int new_size = (size > IK_HEAP_EXT_SIZE) ? size : IK_HEAP_EXT_SIZE;
new_size += 2 * 4096;
new_size = align_to_next_page(new_size);
ap = ik_mmap_mixed(new_size, pcb);
pcb->heap_base = ap;
pcb->heap_size = new_size;
pcb->allocation_redline = ap + new_size - 2 * 4096;
nap = ap + size;
pcb->allocation_pointer = nap;
return ap;
}
}
void ik_error(ikp args){
fprintf(stderr, "Error: ");
ik_fprint(stderr, args);
fprintf(stderr, "\n");
exit(0);
}
void ik_stack_overflow(ikpcb* pcb){
#ifndef NDEBUG
fprintf(stderr, "entered ik_stack_overflow pcb=0x%08x\n", (int)pcb);
#endif
set_segment_type(pcb->stack_base, pcb->stack_size, data_mt, pcb);
ikp frame_base = pcb->frame_base;
ikp underflow_handler = ref(frame_base, -wordsize);
#ifndef NDEBUG
fprintf(stderr, "underflow_handler = 0x%08x\n", (int)underflow_handler);
#endif
/* capture continuation and set it as next_k */
ikp k = ik_alloc(pcb, align(continuation_size)) + vector_tag;
ref(k, -vector_tag) = continuation_tag;
ref(k, off_continuation_top) = pcb->frame_pointer;
ref(k, off_continuation_size) =
pcb->frame_base - (int)pcb->frame_pointer - wordsize;
ref(k, off_continuation_next) = pcb->next_k;
pcb->next_k = k;
pcb->stack_base = ik_mmap_typed(STAKSIZE, mainstack_mt, pcb);
pcb->stack_size = STAKSIZE;
pcb->frame_base = pcb->stack_base + pcb->stack_size;
pcb->frame_pointer = pcb->frame_base - wordsize;
pcb->frame_redline = pcb->stack_base + 2 * 4096;
ref(pcb->frame_pointer, 0) = underflow_handler;
return;
}
/*
char* ik_uuid(char* str){
assert((36 << fx_shift) == (int) ref(str, disp_string_length - string_tag));
uuid_t u;
uuid_clear(u);
uuid_generate(u);
uuid_unparse_upper(u, str + disp_string_data - string_tag);
return str;
}
*/
static const char* uuid_chars =
"!$%&/0123456789<=>?ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static int uuid_strlen = 1;
ikp ik_uuid(ikp str){
static int fd = -1;
if(fd == -1){
fd = open("/dev/urandom", O_RDONLY);
if(fd == -1){
return false_object;
}
uuid_strlen = strlen(uuid_chars);
}
int n = unfix(ref(str, off_string_length));
unsigned char* data = str+off_string_data;
read(fd, data, n);
unsigned char* p = data;
unsigned char* q = data + n;
while(p < q){
*p = uuid_chars[*p % uuid_strlen];
p++;
}
return str;
}
ikp ik_read(ikp fdptr, ikp bufptr, ikp lenptr){
int fd = unfix(fdptr);
int len = unfix(lenptr);
char* buf = (char*)(bufptr+disp_string_data-string_tag);
int bytes = read(fd, buf, len);
if(bytes == -1){
perror("S_read");
exit(-10);
}
return fix(bytes);
}
ikp ik_write(ikp fdptr, ikp idx, ikp str){
fprintf(stderr, "IK_WRITE\n");
int fd = unfix(fdptr);
int len = unfix(idx);
char* buf = (char*)(str+disp_string_data-string_tag);
int bytes = write(fd, buf, len);
if(bytes != len){
perror("S_write");
exit(-10);
}
return true_object;
}
/*
* From the manpages:
*
* int open(const char *pathname, int flags);
* int open(const char *pathname, int flags, mode_t mode);
* flags = (O_RDONLY | O_WRONLY | O_RDWR) ? O_CREAT ? O_TRUNC ? O_APPEND
* return -1 on failure
*
* int unlink(const char *pathname);
*/
ikp ik_open_file(ikp str, ikp flagptr){
int flags;
int f = unfix(flagptr);
char* path = (char*)(str + disp_string_data - string_tag);
if(f == 0){
flags = O_WRONLY | O_CREAT;
} else if(f == 1){
flags = O_WRONLY | O_APPEND;
} else if(f == 2){
unlink(path);
flags = O_WRONLY | O_CREAT;
} else if(f == 3){
flags = O_WRONLY | O_TRUNC;
} else if(f == 4){
flags = O_RDONLY;
} else {
fprintf(stderr, "Error in S_open_file: invalid mode 0x%08x\n",
(int)flagptr);
exit(-10);
}
int fd = open(path, flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if(fd == -1){
fprintf(stderr, "Cannot open %s\n", path);
perror("S_open_file");
exit(-10);
}
if(fd != unfix(fix(fd))){
fprintf(stderr, "fd %d too big\n", fd);
exit(-10);
}
return fix(fd);
}
/*
#include <sys/types.h>
#include <sys/stat.h>
int
stat(const char *path, struct stat *sb);
ERRORS
Stat() and lstat() will fail if:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} charac-
ters, or an entire path name exceeded {PATH_MAX} char-
acters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the
path prefix.
[ELOOP] Too many symbolic links were encountered in translat-
ing the pathname.
[EFAULT] Sb or name points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to
the file system.
*/
ikp
ikrt_file_exists(ikp filename){
char* str = string_data(filename);
struct stat sb;
int st = stat(str, &sb);
if(st == 0){
/* success */
return true_object;
} else {
int err = errno;
if(err == ENOENT){
return false_object;
}
else if(err == ENOTDIR){
return fix(1);
}
else if(err == ENAMETOOLONG){
return fix(2);
}
else if(err == EACCES){
return fix(3);
}
else if(err == ELOOP){
return fix(4);
}
else if(err == EFAULT){
return fix(5);
}
else if(err == EIO){
return fix(6);
}
else {
return fix(-1);
}
}
}
/*
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} charac-
ters, or an entire path name exceeded {PATH_MAX} char-
acters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the
path prefix.
[EACCES] Write permission is denied on the directory containing
the link to be removed.
[ELOOP] Too many symbolic links were encountered in translat-
ing the pathname.
[EPERM] The named file is a directory and the effective user
ID of the process is not the super-user.
[EPERM] The directory containing the file is marked sticky,
and neither the containing directory nor the file to
be removed are owned by the effective user ID.
[EBUSY] The entry to be unlinked is the mount point for a
mounted file system.
[EIO] An I/O error occurred while deleting the directory
entry or deallocating the inode.
[EROFS] The named file resides on a read-only file system.
[EFAULT] Path points outside the process's allocated address
space.
*/
ikp
ikrt_delete_file(ikp filename){
char* str = string_data(filename);
int err = unlink(str);
if(err == 0){
return 0;
}
switch (err){
case ENOTDIR: return fix(1);
case ENAMETOOLONG: return fix(2);
case ENOENT: return fix(3);
case EACCES: return fix(4);
case ELOOP: return fix(5);
case EPERM: return fix(6);
case EBUSY: return fix(7);
case EIO: return fix(8);
case EROFS: return fix(9);
case EFAULT: return fix(10);
}
return fix(-1);
}
ikp ik_close(ikp fd){
int err = close(unfix(fd));
if(err != 0){
perror("S_close");
exit(-10);
}
return true_object;
}
ikp
ik_system(ikp str){
return fix(system(string_data(str)));
}
static char*
mtname(unsigned int n){
if(n == mainheap_type) { return "HEAP_T"; }
if(n == mainstack_type) { return "STAK_T"; }
if(n == pointers_type) { return "PTER_T"; }
if(n == data_type) { return "DATA_T"; }
if(n == code_type) { return "CODE_T"; }
if(n == hole_type) { return " "; }
return "WHAT_T";
}
ikp
ik_dump_metatable(ikpcb* pcb){
unsigned int* s = pcb->segment_vector_base;
unsigned char* p = pcb->memory_base;
unsigned char* hi = pcb->memory_end;
while(p < hi){
unsigned int t = *s & type_mask;
unsigned char* start = p;
p += pagesize;
s++;
while((p < hi) && ((*s & type_mask) == t)){
p += pagesize;
s++;
}
fprintf(stderr, "0x%08x + %5d pages = %s\n",
(int) start,
((int)p-(int)start)/pagesize,
mtname(t));
}
return void_object;
}
ikp
ik_dump_dirty_vector(ikpcb* pcb){
unsigned int* s = pcb->dirty_vector_base;
unsigned char* p = pcb->memory_base;
unsigned char* hi = pcb->memory_end;
while(p < hi){
unsigned int t = *s;
unsigned char* start = p;
p += pagesize;
s++;
while((p < hi) && (*s == t)){
p += pagesize;
s++;
}
fprintf(stderr, "0x%08x + %5d pages = 0x%08x\n",
(int) start,
((int)p-(int)start)/pagesize,
t);
}
return void_object;
}
ikp
ikrt_make_code(ikp codesizeptr, ikp freevars, ikp rvec, ikpcb* pcb){
int code_size = unfix(codesizeptr);
int memreq = align_to_next_page(code_size + disp_code_data);
ikp mem = ik_mmap_code(memreq, 0, pcb);
ref(mem, 0) = code_tag;
ref(mem, disp_code_code_size) = codesizeptr;
ref(mem, disp_code_freevars) = freevars;
ref(mem, disp_code_reloc_vector) = rvec;
ik_relocate_code(mem);
return mem+vector_tag;
}
ikp
ikrt_set_code_reloc_vector(ikp code, ikp vec, ikpcb* pcb){
ref(code, off_code_reloc_vector) = vec;
ik_relocate_code(code-vector_tag);
pcb->dirty_vector[page_index(code)] = -1;
return void_object;
}
ikp
ikrt_strftime(ikp outstr, ikp fmtstr){
time_t t;
struct tm* tmp;
t = time(NULL);
tmp = localtime(&t);
if(tmp == NULL){
fprintf(stderr, "Error in time: %s\n", strerror(errno));
}
int rv =
strftime((char*)outstr+off_string_data,
unfix(ref(outstr, off_string_length)) + 1,
(char*)fmtstr+off_string_data,
tmp);
if(rv == 0){
fprintf(stderr, "Error in strftime: %s\n", strerror(errno));
}
return fix(rv);
}
ikp
ikrt_close_file(ikp fd, ikpcb* pcb){
int err = close(unfix(fd));
if(err == -1){
return false_object;
} else {
return true_object;
}
}
ikp
ikrt_read(ikp fd, ikp buff, ikpcb* pcb){
int bytes = read(unfix(fd), string_data(buff), unfix(ref(buff, off_string_length)));
if(bytes == -1){
return false_object;
} else {
return fix(bytes);
}
}
ikp
ikrt_open_input_file(ikp fname, ikpcb* pcb){
int fd = open(string_data(fname), O_RDONLY);
if(fd == -1){
return false_object;
} else {
return fix(fd);
}
}
ikp
ikrt_open_output_file(ikp fname, ikp flagptr, ikpcb* pcb){
/* [(error) 0] */
/* [(replace) 1] */
/* [(truncate) 2] */
/* [(append) 3] */
int flags;
int f = unfix(flagptr);
if(f == 0){
flags = O_WRONLY | O_CREAT;
} else if(f == 1){
unlink(string_data(fname));
flags = O_WRONLY | O_CREAT;
} else if(f == 2){
flags = O_WRONLY | O_TRUNC;
} else if(f == 3){
flags = O_WRONLY | O_APPEND;
} else {
fprintf(stderr, "Error in S_open_file: invalid mode 0x%08x\n",
(int)flagptr);
exit(-10);
}
int fd = open(string_data(fname), flags,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if(fd == -1){
fprintf(stderr, "openfile failed: %s\n", strerror(errno));
return false_object;
} else {
return fix(fd);
}
}
ikp
ikrt_write_file(ikp fd, ikp buff, ikp idx, ikpcb* pcb){
int bytes = write(unfix(fd), string_data(buff), unfix(idx));
return fix(bytes);
}
ikp
ikrt_write_char(){
fprintf(stderr, "ikrt_write_char\n");
return void_object;
}
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