/* this function does the transformation involved in replacing an
* expression */
static void replace_expression(expr_t* expr,mloop_t* mloop) {
symboltable_t *new_temp;
expr_t *new_expr;
char *new_id = (char *)malloc(10);
statement_t *body=T_MLOOP_BODY(mloop);
/* drop out if replacement expr already exists */
if (find_replacement(mloop, expr)) return;
/* create a new temporary variable */
sprintf(new_id,"__temp%d",idnum);
new_temp = alloc_loc_st (S_VARIABLE,new_id);
S_DTYPE(new_temp) = T_TYPEINFO(expr);
S_VAR_INIT(new_temp) = NULL;
S_INIT(new_temp) = build_init(expr,NULL);
S_PROHIBITIONS(new_temp) |= TILED_OUTER_MLOOP_FLAG;
new_expr = build_0ary_op(VARIABLE,new_temp);
idnum++;
/* replace the variable */
T_ADD_MLOOP_VAR (mloop, new_temp, T_MLOOP_ORDER(mloop, T_MLOOP_RANK(mloop)-1));
replace_expr(expr, copy_expr(new_expr));
/*add_replacement(mloop,copy_expr(expr),copy_expr(new_expr));*/
/* if necessary, reassign the variable */
if (is_written(new_expr,body)) {
statement_t* post;
expr_t* reassign;
reassign=build_binary_op(BIASSIGNMENT,copy_expr(new_expr),copy_expr(expr));
post=build_expr_statement(reassign,T_LINENO(body),T_FILENAME(body));
T_PROHIBITIONS(post) |= TILED_OUTER_MLOOP_FLAG;
T_ADD_MLOOP_POST(mloop,post,T_MLOOP_ORDER(mloop, T_MLOOP_RANK(mloop)-1));
}
} /* replace_expression(expr,mloop) */
/* this function determines whether the expr is assigned to in the stmtls,
* returning 1 if yes or unsure, 0 if no */
static int is_written(expr_t *expr, statement_t *stmtls) {
statement_t *temp;
expr_t *stmt_expr;
for (temp=stmtls; temp; temp=T_NEXT(temp)) {
switch(T_TYPE(temp)) {
case S_EXPR:
stmt_expr = T_EXPR(temp);
if (T_TYPE(stmt_expr)==FUNCTION) {
expr_t *args;
for (args=nthoperand(stmt_expr,2); args; args=T_NEXT(args)) {
if (expr_equal(args,expr)) {
return(1);
}
}
}
if (expr_equal(left_expr(stmt_expr),expr)) {
return(1);
}
break;
case S_IF:
if (is_written(expr,T_THEN(T_IF(temp))))
return(1);
if (is_written(expr,T_ELSE(T_IF(temp))))
return(1);
break;
case S_LOOP:
if (is_written(expr,T_BODY(T_LOOP(temp))))
return(1);
break;
case S_NLOOP:
if (is_written(expr,T_NLOOP_BODY(T_NLOOP(temp))))
return(1);
break;
case S_CONTINUE:
break;
default:
printf("**** %d ****/n", T_TYPE(temp));
exit(1);
return(1);
}
}
return(0);
} /* is_written(expr,stmtls) */
bool
find_and_write(uint32_t frame)
{
pcap_hdr_t pcap_hdr;
pcaprec_hdr_t pcap_rec_hdr;
uint8_t data[65536];
int32_t fdin;
uint32_t fileno, nframe;
uint32_t i, n_read, n_write, n_size, n_extracted;
char filename[128];
// check if the frame has already been written
if (is_written(frame)) {
fprintf(stderr, "frame(%d) already written\n", frame);
return true;
}
i = 0;
nframe = frame % FRAMES_PER_FILE;
fileno = ceil(frame * 1.0 / FRAMES_PER_FILE) - 1; // numbering starts from 00000
snprintf(filename, 128, "%s/%s-%05d.pcap", PCAP_DIR_NAME, PCAP_BASE_NAME, fileno);
if (access(filename, F_OK) == -1) {
printf("file(%s) for frame(%d) does not exist", filename, frame);
return false;
}
fdin = open(filename, O_RDONLY);
if (fdin == -1) {
printf("error:(%s)\n", strerror(errno));
return false;
}
n_size = sizeof(pcap_hdr_t);
n_read = read(fdin, (void *) &pcap_hdr, n_size);
if (n_read < n_size) {
printf("fread(%d).pcap_hdr_t = %d\n", n_size, n_read);
return false;
}
if (!wrote_pcap_hdr) {
write(fdout, &pcap_hdr, sizeof(pcap_hdr_t));
wrote_pcap_hdr = true;
}
printf("frame(%d) @ filename(%s:%d) ", frame, filename, nframe);
while (1) {
i++;
// read pcap record header
n_size = sizeof(pcaprec_hdr_t);
n_read = read(fdin, &pcap_rec_hdr, n_size);
if (n_read < n_size) {
// reached the end of the file
printf("not found\n");
return false;
}
if (i != nframe) {
lseek(fdin, pcap_rec_hdr.incl_len, SEEK_CUR);
continue;
}
// printf("pcap.rec[%03d], timestamp[%d.%d] incl=%d orig=%d\n",
// i, pcap_rec_hdr.ts_sec, pcap_rec_hdr.ts_usec, pcap_rec_hdr.incl_len, pcap_rec_hdr.orig_len);
printf("found\n");
n_read = read(fdin, data, pcap_rec_hdr.incl_len);
n_write = write(fdout, &pcap_rec_hdr, sizeof(pcaprec_hdr_t));
n_write = write(fdout, data, n_read);
written[n_written++] = frame;
break;
}
close(fdin);
return true;
}