int interpret_line(char *str, t_info *info, int i)
{
int j;
int start_reading;
int found_command;
start_reading = check_for_label(str);
found_command = 0;
j = start_reading;
if (str[0] == '\0')
return (0);
if (ft_strncmp(NAME_CMD_STRING, str, ft_strlen(NAME_CMD_STRING)) == 0)
return (0);
if (ft_strncmp(COMMENT_CMD_STRING, str, ft_strlen(COMMENT_CMD_STRING)) == 0)
return (0);
while (str[j] != '\0' && str[j] != COMMENT_CHAR)
{
if (found_command == 0 && str[j] != ' ' && str[j] != '\t')
{
info->line_nbr = i + 1;
if (get_command(info, str, &j, &found_command) == -1)
return (-1);
else
return (0);
}
j++;
}
return (0);
}
/*** set_label_addresses
* This function is used to initially cycle through the input file looking for labels. This is necessary,
* because if, for example, you come across a beq instruction that references a label that hasn't been
* declared yet, the compilation will fail.
***/
struct instruction* set_label_addresses(struct instruction *inst, FILE *input)
{
char string[BUFFER_SIZE];
char label[BUFFER_SIZE];
char* c;
while(fscanf(input, "%s", string) != EOF)
{
if (check_for_label(string) == 1)
strcpy(label, string);
else
strcpy(label, "");
inst = add_ll_node(inst, label);
c = fgets(string, BUFFER_SIZE, input);
}
return inst;
}
//done
void check_line_syntax (char* token) {
printf("check_line_syntax('%s')\n", token);
//check if its a label
token = check_for_label(token);
printf(" my token is %s \n ", token);
//store the op in an int
if(token == NULL)
return;
int myop = util_get_opcode(token);
printf("opcode is: %d\n", myop );
//store it itno my data structure..
currInfo -> opcode = myop;
if(myop == OP_BR){
currInfo->reg1 = util_parse_cond(token+2);
token = next_token();
currInfo->reference = strdup(token);
//get_operand(op,token);
}
LC3_inst_t* inst = lc3_get_inst_info(myop);
printf("inst is: %p \n" , inst);
int position = 0;
if(strcasecmp(inst ->forms[0].name,token) != 0){
position = 1;
}
/*if(inst ->forms[1].name != NULL &&strcasecmp(inst ->forms[1].name,token) == 0){
position = 1;
if(strcasecmp(inst ->forms[0].name,token) != 0)
position = 1;
}*/
if(myop != OP_BR){
currInfo->form=position;}
printf("%d\n whats my position", position);
operands_t format = inst -> forms[position].operands;
scan_operands(format);
}
/*** process_file
* This function is the main input file processing loop. It takes the instruction string in ASM and turns it into
* machine code. First, the op-code and corresponding funct are determined and then the register names are read in and processed.
* The offset and jsec values are determined using other functions.
***/
struct instruction* process_file(struct instruction *inst, FILE *input)
{
char string[BUFFER_SIZE];
//note that the current instruction address is tracked. this is for use with branching and jumps.
int op, r1, r2, r3, funct, offset, jsec, address=0x4000;
while(fscanf(input, "%s", string) != EOF)
{
if (check_for_label(string) == 1)
{
fscanf(input, "%s", string);
}
set_op_funct(&op, &funct, string);
if (op == 0) //add, sub, and, or, slt, sltu
{
fscanf(input, "%s", string);
r3 = get_reg(string);
fscanf(input, "%s", string);
r1 = get_reg(string);
fscanf(input, "%s", string);
r2 = get_reg(string);
offset = 0;
jsec = 0;
}
else if (op == 2) //j
{
r1 = 0;
r2 = 0;
r3 = 0;
offset = 0;
fscanf(input, "%s", string);
jsec = find_label_address(inst, strcat(string,":"));
}
else if (op == 4) //beq
{
fscanf(input, "%s", string);
r1 = get_reg(string);
fscanf(input, "%s", string);
r2 = get_reg(string);
r3 = 0;
fscanf(input, "%s", string);
offset = calculate_offset(address, find_label_address(inst, strcat(string,":")));
jsec = 0;
}
else if (op == 8) //addi
{
fscanf(input, "%s", string);
r1 = get_reg(string);
fscanf(input, "%s", string);
r2 = get_reg(string);
r3 = 0;
fscanf(input, "%d", &offset);
jsec = 0;
}
else if (op == 10 || op == 11) //slti, sltiu
{
fscanf(input, "%s", string);
r2 = get_reg(string);
fscanf(input, "%s", string);
r1 = get_reg(string);
r3 = 0;
fscanf(input, "%d", &offset);
jsec = 0;
}
else if (op == 15) //lui
{
fscanf(input, "%s", string);
r1 = 0;
r2 = get_reg(string);
r3 = 0;
fscanf(input, "%d", &offset);
jsec = 0;
}
else if (op == 35 || op == 43) //lw, sw
{
fscanf(input, "%s", string);
r2 = get_reg(string);
fscanf(input, "%s", string);
int offset, reg;
get_mem_offset_and_word_reg(string, &offset, ®);
r1 = reg;
r3 = 0;
offset = offset;
jsec = 0;
}
inst = modify_ll_node(inst, address, op, r1, r2, r3, funct, offset, jsec);
address += 0x4; //the current address is incremented by 4 after every instruction is processed
}
return inst;
}