/** execute_FOR Executes for statement.
* initialize condition increment
* for(<statement>; <expression>; <expression>)
* <statement>;
*
* @param p_function_id
*/
void cx_executor::execute_FOR(cx_symtab_node * p_function_id) {
bool condition = false;
get_token(); // for
// get the location of where to go to if <expr> is false.
int break_point = get_location_marker();
get_token();
int statement_location = get_location_marker();
get_token();
int condition_marker = get_location_marker();
get_token();
int increment_marker = get_location_marker();
get_token();
// (
get_token();
if (token != tc_semicolon) {
// declaration would go here //
execute_assignment(p_node);
}
do {
get_token(); // ;
if (token != tc_semicolon) {
// expr 2
execute_expression();
get_token(); // ;
} else get_token();
condition = top()->basic_types.bool__;
pop();
if (condition) {
go_to(statement_location);
get_token();
execute_statement(p_function_id);
if (break_loop) go_to(break_point);
} else {
go_to(break_point);
get_token();
break;
}
go_to(increment_marker);
get_token();
// expr 3
execute_expression();
go_to(condition_marker);
} while (current_location() == condition_marker);
break_loop = false;
}
static GLuint
execute_expressions (slang_string *output, grammar eid, const byte *expr, GLint results[2],
slang_info_log *elog)
{
GLint success;
byte *code;
GLuint size, count = 0;
success = grammar_fast_check (eid, expr, &code, &size, 64);
if (success) {
GLuint i = 0;
while (code[i++] == EXP_EXPRESSION) {
assert (count < 2);
if (!execute_expression (output, code, &i, &results[count], elog)) {
count = 0;
break;
}
count++;
}
grammar_alloc_free (code);
}
else {
slang_info_log_error (elog, "syntax error in preprocessor expression.");\
}
return count;
}
static void
parse_configuration_in(int check, FILE *fp, mipv6_conf_item_t *items)
{
int wptr = 0, c, line = 1, col = 1, currarg = 0, comment = 0, a0ln, i;
char wbuf[MAX_WORD_LENGTH], *params[MAX_PARAMS];
while (1) {
c = fgetc(fp);
if (c < 0)
break;
if (check && !(isprint (c) || c == '\n'))
exit_with_error_f(line, "Invalid character in column %i.",
col);
col++;
if (comment) {
if (c == '\n') {
comment = 0;
line++;
}
continue;
}
if (isspace(c) || c == ';') {
if (wptr > 0) {
wbuf[wptr] = 0;
wptr = 0;
debug_assert(currarg < MAX_PARAMS,
"Too many parameters.");
if (currarg == 0)
a0ln = line;
params[currarg++] = strdup(wbuf);
}
if (c == '\n') {
line++;
col = 1;
}
if (c == ';') {
debug_assert(currarg > 0, "Empty expression.");
execute_expression(a0ln, check, params,
currarg, items);
for (i = 0; i < currarg; i++)
free(params[i]);
currarg = 0;
}
} else if (c == '#') {
comment = 1;
} else {
wbuf[wptr++] = c;
}
}
if (check && currarg > 0)
exit_with_error_f(a0ln, "Unfinished expression");
}
/** execute_IF Executes if statements.
*
* if(<boolean expression>)
* <statement>;
* else if (<boolean expression>)
* <statement>;
* else
* <statement>;
*
* @param p_function_id : routine ID this statement is apart of.
*/
void cx_executor::execute_IF(cx_symtab_node * p_function_id) {
// if
get_token();
// get the location of where to go to if <expr> is false.
int at_false = get_location_marker();
get_token();
// (
//get_token();
execute_expression();
bool condition = top()->basic_types.bool__;
// )
//get_token();
if (condition) {
// True: { or single statement
execute_statement(p_function_id);
while (token == tc_semicolon)get_token();
// If there is an ELSE part, jump around it.
if (token == tc_ELSE) {
get_token();
go_to(get_location_marker());
get_token(); // token following the IF statement
}
} else {
// False: Go to the false location.
go_to(at_false);
get_token();
if (token == tc_ELSE) {
// ELSE <stmt-2>
get_token();
get_location_marker(); // skip over location marker
// { or single statement
get_token();
execute_statement(p_function_id);
while (token == tc_semicolon)get_token();
}
}
}
/** execute_actual_parameters Execute the actual parameters of
* a declared subroutine call.
*
* @param p_function_id : ptr to the subroutine name's symtab node
*/
void cx_executor::execute_actual_parameters (cx_symtab_node *p_function_id) {
cx_symtab_node *p_formal_id; // ptr to formal parm's symtab node
// Loop to execute each actual parameter.
for (p_formal_id = p_function_id->defn.routine.locals.p_parms_ids;
p_formal_id;
p_formal_id = p_formal_id->next__) {
cx_type *p_formal_type = p_formal_id->p_type;
get_token();
/* Reference parameter: execute_variable will leave the actual
* parameter's address on top of the stack. */
if (p_formal_id->defn.how == dc_reference) {
const int size = p_node->p_type->size;
p_formal_type->form = p_node->p_type->form;
execute_variable(p_node, true);
if (p_formal_type->form == fc_array) {
p_formal_type->size = size;
p_formal_type->array.element_count = size;
p_formal_type->array.max_index = size;
p_formal_id->runstack_item = top();
} else {
p_formal_id->runstack_item = top();
}
get_token();
}// value parameter
else {
cx_type *p_actual_type = execute_expression();
if ((p_formal_type == p_float_type) &&
(p_actual_type->base_type() == p_integer_type)) {
// real formal := integer actual:
// convert integer value to real.
float ff = top()->basic_types.int__;
pop();
push(ff);
p_formal_id->runstack_item = top();
} else if (!p_formal_type->is_scalar_type()) {
/* Formal parameter is an array or a record:
* Make a copy of the actual parameter's value. */
const int size = p_actual_type->size;
void *p_target_address = nullptr;
const int num_of_elements = size / p_actual_type->base_type()->size;
p_target_address = realloc(p_target_address, size);
//memset(p_target_address, 0, size);
if (p_target_address == nullptr) {
perror("realloc");
exit(0);
}
void *p_source = top()->basic_types.addr__;
memcpy(p_target_address, p_source, size);
pop();
push(p_target_address);
p_formal_type->array.element_count = num_of_elements;
p_formal_type->array.max_index = num_of_elements;
p_formal_type->size = size;
p_formal_type->form = fc_array;
p_formal_id->runstack_item = top();
} else {
// Range check an integer or enumeration
// formal parameter.
range_check(p_formal_type, top()->basic_types.int__);
p_formal_id->runstack_item = top();
}
}
}
if (token == tc_left_paren) get_token();
}