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dataEncoder.c
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dataEncoder.c
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/*
====================================================================================
Name : dataEncoder.c
Description: This file holds methods relevant to .string and .data line processing
====================================================================================
*/
#include "consts.h"
#include "structs.h"
#include "functions.h"
#include "dataEncoder.h"
#include "symbolTable.h"
#include <string.h>
#include <stdbool.h>
/* DataEncoder head and tail */
data_node_ptr p_data_head = NULL;
data_node_ptr p_data_tail = NULL;
/* Declare functions */
void process_numbers(transition_data* transition);
void process_string(transition_data* transition);
void add_data_node_to_list(data_node_ptr p_new_data);
/* Description: Updates data addresses according to code block size */
void update_data_address(int ic_length) {
data_node_ptr p_current = p_data_head;
while (p_current != NULL) {
p_current->current_data.address += ic_length + ADDRESS_START;
p_current = p_current->next;
}
}/*end of update_data_address method*/
/* Description: Adds a numeric data to the list */
bool add_numeric_data_to_list(int number, unsigned int address) {
data_node_ptr p_data = (data_node_ptr)allocate_memory(sizeof(data_node));
/* if we managed to create a new node, insert values and add to list */
if (p_data != NULL) {
p_data->current_data.encoded_data.bits.number = number;
p_data->current_data.address = address;
p_data->next = NULL;
add_data_node_to_list(p_data);
return true;
} else {
return false;
}
}/*end of add_numeric_data_to_list method*/
/* Description: Adds new data found in code to the list */
void add_data_node_to_list(data_node_ptr p_new_data) {
/* This is the first data */
if (p_data_head == NULL) {
p_data_head = p_new_data;
p_data_tail = p_new_data;
} else {
/* Inserts the data in the end */
p_data_tail->next = p_new_data;
p_data_tail = p_new_data;
}
} /*end of add_data_node_to_list*/
/* Description: Processes a data initialization line */
void first_transition_process_data(transition_data* transition, char* label, char* data_type, bool is_symbol) {
if (is_symbol) {
/* Check if symbol exists in symbol table*/
symbol_node_ptr p_searched_symbol = search_symbol(label);
/* If symbol does not exist in symbol table, create it and add it */
if (p_searched_symbol == NULL) {
symbol_node_ptr p_symbol = create_symbol(label, transition->DC, false, true);
if (p_symbol != NULL) {
add_symbol_to_list(p_symbol);
} else {
transition->is_runtimer_error = true;
free(label);
return;
}
} else {
print_compiler_error("Each label can be defined only once", transition->current_line_information);
transition->is_compiler_error = true;
return;
}
}
skip_all_spaces(transition->current_line_information);
/* Extract data according to type */
if (is_end_of_data_in_line(transition->current_line_information)) {
print_compiler_error("Missing data after .string or .data", transition->current_line_information);
transition->is_compiler_error = true;
}
/* This is a string initialization */
else if (strcmp(data_type, STRING_OPERATION) == 0) {
process_string(transition);
}
/* This is a numeric data */
else {
process_numbers(transition);
}
}/*end of first_transition_process_data method*/
/* Description: Processes a string */
void process_string(transition_data* transition) {
/* Check if the string starts with " */
if (transition->current_line_information->line_str[transition->current_line_information->current_index] != QUOTATION) {
print_compiler_error("A string must start with a '\"' token", transition->current_line_information);
transition->is_compiler_error = true;
} else {
bool success;
/* Skip quotation mark */
transition->current_line_information->current_index++;
/* Keep scanning till end of line */
while (!is_end_of_line(transition->current_line_information)) {
char token = transition->current_line_information->line_str[transition->current_line_information->current_index];
if (token == END_OF_LINE) {
print_compiler_error("A string must end with a '\"' token", transition->current_line_information);
transition->is_compiler_error = true;
break;
} else if (token == QUOTATION) {
transition->current_line_information->current_index++;
break;
} else if (token != QUOTATION) {
success = add_string_data_to_list(token, transition->DC);
if (!success) {
transition->is_runtimer_error = true;
return;
} else {
transition->DC++;
}
}
transition->current_line_information->current_index++;
}
/* Add string to list or die */
success = add_string_data_to_list(STRING_DATA_END, transition->DC);
if (!success) {
transition->is_runtimer_error = true;
return;
}
transition->DC++;
if (!is_end_of_data_in_line(transition->current_line_information)) {
print_compiler_error("Invalid tokens after .string instruction", transition->current_line_information);
transition->is_compiler_error = true;
}
}
}/*end of process string method*/
/* Description: Processes numbers definition */
void process_numbers(transition_data* transition) {
bool should_process_next_number = true;
bool success;
skip_all_spaces(transition->current_line_information);
/* Make sure .data contains numbers */
if (is_end_of_data_in_line(transition->current_line_information)) {
print_compiler_error("Invalid .data definition. Missing numbers.", transition->current_line_information);
transition->is_compiler_error = true;
}
/* Processes all numbers in line */
while (!is_end_of_line(transition->current_line_information) && should_process_next_number) {
char* partial_line = NULL;
int number;
if (get_next_number(transition, &number)) {
success = add_numeric_data_to_list(number, transition->DC++);
if (!success) {
transition->is_runtimer_error = true;
return;
}
/* Search the next ',' */
partial_line=strchr(transition->current_line_information->line_str +
transition->current_line_information->current_index, NUMBER_TOKEN_SEPERATOR);
/* Found ',' and scan another number */
if (partial_line != NULL) {
transition->current_line_information->current_index = partial_line - transition->current_line_information->line_str + 1;
should_process_next_number = true;
} else {
skip_all_spaces(transition->current_line_information);
should_process_next_number = false;
}
} else {
should_process_next_number = false;
}
}
/* If it's not end of line or we need to get another number, throw an error */
if (!is_end_of_line(transition->current_line_information) || should_process_next_number) {
print_compiler_error(".data syntax is invalid", transition->current_line_information);
transition->is_compiler_error = true;
}
}/*end of process numbers method*/
/* Description: Adds a string to the data list */
bool add_string_data_to_list(char data, unsigned int address) {
data_node_ptr p_data = (data_node_ptr)allocate_memory(sizeof(data_node));
/* if we managed to create a new node, insert values and add to list */
if (p_data != NULL) {
p_data->current_data.encoded_data.bits.number = data;
p_data->current_data.address = address;
p_data->next = NULL;
add_data_node_to_list(p_data);
return true;
} else {
return false;
}
}/*end of add_string_data_to_list method*/
/* Description: Gets the next number from the .data line */
bool get_next_number(transition_data* transition, int* number) {
skip_all_spaces(transition->current_line_information);
/* Reaches end of line while expecting a number */
if (is_end_of_line(transition->current_line_information)) {
print_compiler_error("Expected number definition", transition->current_line_information);
transition->is_compiler_error = true;
} else {
int number_start_index = transition->current_line_information->current_index;
int number_end_index = transition->current_line_information->current_index;
/* First token of the number is a minus or a plus */
if ((transition->current_line_information->line_str[number_start_index] == MINUS_SIGN) ||
transition->current_line_information->line_str[number_start_index] == PLUS_SIGN) {
number_end_index++;
}
/* Makes sure the next token is a digit */
if (!is_end_of_line(transition->current_line_information) &&
!isdigit(transition->current_line_information->line_str[number_end_index])) {
print_compiler_error("A number must have digits in it", transition->current_line_information);
transition->is_compiler_error = true;
} else if (!is_end_of_line(transition->current_line_information)){
char* number_string = NULL;
/* Finds all digits */
while (isdigit(transition->current_line_information->line_str[number_end_index])) {
number_end_index++;
}
/* Last token wasn't part of the number */
number_end_index--;
/* Copying the number from the line into a new memory space, or die */
number_string = allocate_string(number_end_index - number_start_index + 1);
if (!number_string) {
transition->is_runtimer_error = true;
return false;
}
strncpy(number_string, transition->current_line_information->line_str + number_start_index, number_end_index - number_start_index + 1);
number_string[number_end_index - number_start_index + 1] = END_OF_STRING;
*number = atoi(number_string);
free(number_string);
transition->current_line_information->current_index = number_end_index + 1;
return true;
}
}
return false;
}/*end of get next number method*/
/*
* Second run method
* Description: Writes all data definitions into an output file */
void write_data_to_output_file(FILE* output_file) {
data_node_ptr p_current_data = p_data_head;
while (p_current_data != NULL) {
data_definition data = p_current_data->current_data;
fprintf(output_file,"%x\t%04x\n",data.address,data.encoded_data.value);
p_current_data = p_current_data->next;
}
}
/* Description: Free memory list */
void free_data_node_list() {
data_node_ptr p_cleaner_data = p_data_head;
/* Clean nodes until no more nodes */
while (p_data_head) {
p_cleaner_data = p_data_head;
p_data_head = p_data_head->next;
free (p_cleaner_data);
}
return;
} /*end of free_data_node_list method*/