trying to fix memory
This commit is contained in:
parent
992897c4ff
commit
990900ae9a
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@ -267,7 +267,7 @@ Token malar_next_token(Buffer * sc_buf)
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b_retract_to_mark(sc_buf);
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lex_buf = b_create(1, 1, 'a');
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lex_buf = b_create(20, 8, 'a');
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/* Copy the scanned lexeme into lexical buffer */
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for (; lexstart < lexend; ++lexstart) {
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431
stable.c
431
stable.c
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@ -9,13 +9,13 @@
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*/
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#include "stable.h"
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#define PLSBD_SZ 256
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#define PLSBD_SZ 40
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#define PLSBD_INC 8
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#define DEBUG
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/*#undef DEBUG*/
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/*#undef DEBUG*/
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/* Forward function declarations */
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/* Forward function declarations */
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static void st_setsize(void);
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static void st_incoffset(void);
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extern STD sym_table;
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@ -24,30 +24,30 @@ extern STD sym_table;
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* Author: Victor Fernandes, 040772243
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* Version: 0.0.1
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* Called functions: malloc, b_create, free
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* Parameters:
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int - size of the symbol table
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* Return value:
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STD - The symbol table
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* Parameters:
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int - size of the symbol table
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* Return value:
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STD - The symbol table
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* Algorithm:
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*/
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STD st_create(int st_size){
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STD new_stable;
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STD st_create(int st_size) {
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STD new_stable;
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new_stable.plsBD = NULL;
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new_stable.plsBD = NULL;
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new_stable.pstvr = (STVR*)malloc((size_t)st_size * sizeof(STVR));
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if (st_size <= 0 || (new_stable.pstvr == NULL)) {
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new_stable.st_size = 0;
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}
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if (st_size <= 0 || (new_stable.pstvr == NULL)) {
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new_stable.st_size = 0;
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}
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new_stable.plsBD = b_create(PLSBD_SZ, PLSBD_INC, 'a');
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if (new_stable.plsBD == NULL) {
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free(new_stable.plsBD);
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new_stable.st_size = 0;
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}
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if (new_stable.plsBD == NULL) {
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free(new_stable.plsBD);
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new_stable.st_size = 0;
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}
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new_stable.st_size = st_size;
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new_stable.st_offset = 0;
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new_stable.st_size = st_size;
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new_stable.st_offset = 0;
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return new_stable;
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return new_stable;
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}
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/* Install a new entry in the symbol table
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@ -55,101 +55,110 @@ STD st_create(int st_size){
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* Version: 0.0.1
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* Called functions: st_lookup, b_setmark, b_size, b_addc, b_rflag, st_incoffset
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* Parameters:
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STD - The symbol table
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char - The lexeme to be stored
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char - the type of the lexeme
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int - the line in the source file where the lexeme was found
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STD - The symbol table
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char - The lexeme to be stored
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char - the type of the lexeme
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int - the line in the source file where the lexeme was found
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* Return value:
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int - the element offset of where the symbol table is pointing to
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-1 if an internal error occurs
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int - the element offset of where the symbol table is pointing to
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-1 if an internal error occurs
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* Algorithm:
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*/
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int st_install(STD s_table, char *lexeme, char type, int line){
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unsigned int offset, i, j, lex_len;
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short bd_offset, flag;
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int st_install(STD s_table, char *lexeme, char type, int line) {
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int offset = -1, i, j, lex_len, bd_offset, lex_offset = 0, flag = 0;
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/* Cannot add new entry, table full */
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if (s_table.st_offset >= s_table.st_size)
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return -1;
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/* Look for an existing entry in the symbol table */
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offset = st_lookup(s_table, lexeme);
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if (offset > -1)
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return offset;
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/* Cannot add new entry, table full */
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if (s_table.st_offset >= s_table.st_size)
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return -1;
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/* Add lexeme to the symbol table's lexeme buffer */
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lex_len = strlen(lexeme);
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for (i = 0; i <= lex_len; ++i){
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if (!b_addc(s_table.plsBD, lexeme[i]))
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return -1;
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if (b_rflag(s_table.plsBD) == SET_R_FLAG){ /* COPY NEW ADDRESSES TO PLEX ENTRIES */
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flag = 1;
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}
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}
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if (flag == 1){
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bd_offset = 0;
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for (j = 0; j <= s_table.st_offset; ++j){
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s_table.pstvr[j].plex = b_setmark(s_table.plsBD, bd_offset + s_table.pstvr[j].i_value.str_offset);
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if (j < s_table.st_offset)
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bd_offset += s_table.pstvr[j+1].i_value.str_offset + 1; /*Add one because the offset doesn't include '\0' */
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}
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}
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/* Look for an existing entry in the symbol table */
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if (s_table.st_offset > 0)
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offset = st_lookup(s_table, lexeme);
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/* Set proper pointer values on symbol table */
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s_table.pstvr[s_table.st_offset].plex = b_setmark(s_table.plsBD, b_size(s_table.plsBD));
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s_table.pstvr[s_table.st_offset].o_line = line;
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if (offset > -1)
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return offset;
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/* Add lexeme to the symbol table's lexeme buffer */
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lex_len = strlen(lexeme);
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for (i = 0; i <= lex_len; ++i) {
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if (!b_addc(s_table.plsBD, lexeme[i]))
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return -1;
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if (b_rflag(s_table.plsBD) == SET_R_FLAG) { /* COPY NEW ADDRESSES TO PLEX ENTRIES */
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flag = 1;
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}
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}
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if (flag == 1) {
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bd_offset = 0;
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for (j = 0; j <= s_table.st_offset; ++j) {
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s_table.pstvr[j].plex = b_setmark(s_table.plsBD, (short)(bd_offset + s_table.pstvr[j].i_value.str_offset));
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if (j < s_table.st_offset)
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bd_offset += s_table.pstvr[j + 1].i_value.str_offset + 1; /*Add one because the offset doesn't include '\0' */
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}
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}
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/* Set the default mask before setting the rest of the masks */
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s_table.pstvr[s_table.st_offset].status_field = DFT_MASK;
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/* Set proper pointer values on symbol table */
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/* Get buffer offset location of the lexeme stored */
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lex_offset = b_size(s_table.plsBD) - (strlen(lexeme) + 1);
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switch (type){
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case 'I': /* Integer type */
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s_table.pstvr[s_table.st_offset].status_field |= INT_MASK;
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s_table.pstvr[s_table.st_offset].i_value.int_val = 0;
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break;
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case 'F': /* Floating point type */
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s_table.pstvr[s_table.st_offset].status_field |= FLT_MASK;
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s_table.pstvr[s_table.st_offset].i_value.fpl_val = 0.0f;
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break;
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case 'S': /* String type */
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s_table.pstvr[s_table.st_offset].status_field |= STR_MASK;
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s_table.pstvr[s_table.st_offset].i_value.str_offset = -1;
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break;
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default:
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return -1; /* Not supposed to fall into here */
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}
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s_table.pstvr[s_table.st_offset].plex = b_setmark(s_table.plsBD, (short) lex_offset);
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s_table.pstvr[s_table.st_offset].o_line = line;
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s_table.pstvr[s_table.st_offset].i_value.str_offset = lex_offset;
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/* Set the default mask before setting the rest of the masks */
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s_table.pstvr[s_table.st_offset].status_field = DFT_MASK;
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/* Increment the symbol table offset */
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st_incoffset();
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return s_table.st_offset;
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switch (type) {
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case 'I': /* Integer type */
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s_table.pstvr[s_table.st_offset].status_field |= INT_MASK;
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s_table.pstvr[s_table.st_offset].i_value.int_val = 0;
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break;
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case 'F': /* Floating point type */
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s_table.pstvr[s_table.st_offset].status_field |= FLT_MASK;
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s_table.pstvr[s_table.st_offset].i_value.fpl_val = 0.0f;
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break;
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case 'S': /* String type */
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s_table.pstvr[s_table.st_offset].status_field |= STR_MASK;
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s_table.pstvr[s_table.st_offset].i_value.int_val = -1;
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s_table.pstvr[s_table.st_offset].i_value.fpl_val = -1.0f;
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break;
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default:
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return -1; /* Not supposed to fall into here */
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}
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/* Increment the symbol table offset */
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st_incoffset();
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return s_table.st_offset;
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}
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/* Look up the lexeme string in the symbol table's buffer
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/* Look up the lexeme string in the symbol table's buffer
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* Author: Victor Fernandes
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* Version: 0.1
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* Called functions: b_setmark, strcmp, strlen
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* Parameters:
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STD - The symbol table
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char - The lexeme to be searched
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STD - The symbol table
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char - The lexeme to be searched
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* Return value:
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int - the element offset index in the symbol table
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-1 if no element was found
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int - the element offset index in the symbol table
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-1 if no element was found
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*/
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int st_lookup(STD s_table, char *lexeme){
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int i; /* idx: index location for symbol table, i: increment counter*/
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for (i = s_table.st_offset; i >= 0; --i) {
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if (strcmp(lexeme, s_table.pstvr[i].plex) == 0)
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return i;
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}
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int st_lookup(STD s_table, char *lexeme) {
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int i; /* idx: index location for symbol table, i: increment counter*/
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#ifdef DEBUG
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printf("found nothing\n");
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printf("Looking up %s...", lexeme);
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#endif
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return -1; /* Found nothing */
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for (i = s_table.st_offset - 1; i >= 0; --i) {
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if (strcmp(lexeme, s_table.pstvr[i].plex) == 0) {
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printf("YES\n");
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return i;
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}
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}
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#ifdef DEBUG
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printf("NO\n");
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#endif
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return -1; /* Found nothing */
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}
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/* Change the data type indicator of the variable entry located in vid_offset.
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@ -157,40 +166,40 @@ int st_lookup(STD s_table, char *lexeme){
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* Version: 0.1
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* Called functions: N/A
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* Parameters:
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STD - The symbol table
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int - the offset location of the VID
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char - the new type of the VID
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STD - The symbol table
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int - the offset location of the VID
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char - the new type of the VID
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* Return value:
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1 if change successful, -1 if no change was made or internal error
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1 if change successful, -1 if no change was made or internal error
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*/
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int st_change_type(STD s_table, int vid_offset, char v_type) {
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/* Do nothing if update flag has already been set */
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if ((s_table.pstvr[vid_offset].status_field & U_MASK)) return -1;
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/* Do nothing if update flag has already been set */
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if ((s_table.pstvr[vid_offset].status_field & U_MASK)) return -1;
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/* Reset to new type with default mask and update flag
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Note: Can separate the statements to set the update flag at the
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end, but this resets AND updates at once
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*/
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/*sym_table.pstvr[vid_offset].status_field = sym_table.pstvr[vid_offset].status_field & DFT_U_MASK;*/
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s_table.pstvr[vid_offset].status_field &= DFT_U_MASK;
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/* Reset to new type with default mask and update flag
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Note: Can separate the statements to set the update flag at the
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end, but this resets AND updates at once
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*/
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/*sym_table.pstvr[vid_offset].status_field = sym_table.pstvr[vid_offset].status_field & DFT_U_MASK;*/
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s_table.pstvr[vid_offset].status_field &= DFT_U_MASK;
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/*TODO: Ask if re-setting flags and "bailing out" is spec breaking, and
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if flags should only be set if v_type is valid */
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/*TODO: Ask if re-setting flags and "bailing out" is spec breaking, and
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if flags should only be set if v_type is valid */
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switch (v_type){
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case 'I': /* Integer type */
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s_table.pstvr[s_table.st_offset].status_field |= INT_MASK;
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break;
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case 'F': /* Floating point type */
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s_table.pstvr[s_table.st_offset].status_field |= FLT_MASK;
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break;
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case 'S': /* String type, do nothing as it cannot be changed */
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break;
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default:
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return -1; /* Not supposed to fall into here */
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}
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return 1;
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switch (v_type) {
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case 'I': /* Integer type */
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s_table.pstvr[s_table.st_offset].status_field |= INT_MASK;
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break;
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case 'F': /* Floating point type */
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s_table.pstvr[s_table.st_offset].status_field |= FLT_MASK;
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break;
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case 'S': /* String type, do nothing as it cannot be changed */
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break;
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default:
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return -1; /* Not supposed to fall into here */
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}
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return 1;
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}
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@ -199,14 +208,14 @@ int st_change_type(STD s_table, int vid_offset, char v_type) {
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* Version: 0.0.1
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* Called functions: N/A
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* Parameters:
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STD - The symbol table
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int - the offset location of the VID
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Value - the new value of the VID
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STD - The symbol table
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int - the offset location of the VID
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Value - the new value of the VID
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* Return value: the offset location of the VID
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*/
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int st_change_value(STD s_table, int vid_offset, Value value){
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s_table.pstvr[vid_offset].i_value = value;
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return vid_offset;
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int st_change_value(STD s_table, int vid_offset, Value value) {
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s_table.pstvr[vid_offset].i_value = value;
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return vid_offset;
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}
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/* Get the type of the variable specified by vid_offset
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@ -214,25 +223,25 @@ int st_change_value(STD s_table, int vid_offset, Value value){
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* Version: 0.0.1
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* Called functions: N/A
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* Parameters:
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STD - The symbol table
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int - the offset of the VID in the table
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STD - The symbol table
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int - the offset of the VID in the table
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* Return value:
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char - the type of the VID ('I','F', or 'S')
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-1 if there is an invalid value set
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char - the type of the VID ('I','F', or 'S')
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-1 if there is an invalid value set
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*/
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char st_get_type(STD s_table, int vid_offset){
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unsigned short mask;
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mask = s_table.pstvr[vid_offset].status_field & CHK_MASK;
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switch (mask){
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case INT_MASK:
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return 'I';
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case FLT_MASK:
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return 'F';
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case STR_MASK:
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return 'S';
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default:
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return -1; /* Not supposed to fall into here */
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}
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char st_get_type(STD s_table, int vid_offset) {
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unsigned short mask;
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mask = s_table.pstvr[vid_offset].status_field & CHK_MASK;
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switch (mask) {
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case INT_MASK:
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return 'I';
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case FLT_MASK:
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return 'F';
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case STR_MASK:
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return 'S';
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default:
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return -1; /* Not supposed to fall into here */
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}
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}
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/* Return the i_value of the variable specified by vid_offset
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@ -240,14 +249,14 @@ char st_get_type(STD s_table, int vid_offset){
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* Version: 0.0.1
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* Called functions:
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* Parameters:
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STD - The symbol table
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int - the offset of the VID in the table
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* Return value:
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Value - the value of the VID
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Incorrect parameters will cause undefined behaviour
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STD - The symbol table
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int - the offset of the VID in the table
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* Return value:
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Value - the value of the VID
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Incorrect parameters will cause undefined behaviour
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*/
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Value st_get_value(STD s_table, int vid_offset){
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return s_table.pstvr[vid_offset].i_value;
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Value st_get_value(STD s_table, int vid_offset) {
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return s_table.pstvr[vid_offset].i_value;
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}
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/* Free memory used by the symbol table
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@ -255,14 +264,14 @@ Value st_get_value(STD s_table, int vid_offset){
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* Version: 0.0.1
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* Called functions: free, b_free
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* Parameters:
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STD - The symbol table
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STD - The symbol table
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*/
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void st_destroy(STD s_table){
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if (s_table.pstvr != NULL){
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free(s_table.pstvr);
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s_table.pstvr = NULL;
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}
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b_free(s_table.plsBD);
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void st_destroy(STD s_table) {
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if (s_table.pstvr != NULL) {
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free(s_table.pstvr);
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s_table.pstvr = NULL;
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}
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b_free(s_table.plsBD);
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}
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/* Print the contents of the symbol table to standard output
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@ -270,70 +279,70 @@ void st_destroy(STD s_table){
|
|||
* Version: 0.0.1
|
||||
* Called functions: printf
|
||||
* Parameters:
|
||||
STD - The symbol table
|
||||
STD - The symbol table
|
||||
* Return value:
|
||||
int - the number of items printed to stdout
|
||||
int - the number of items printed to stdout
|
||||
*/
|
||||
int st_print(STD s_table){
|
||||
int i;
|
||||
|
||||
if (s_table.st_size <=0) return -1;
|
||||
|
||||
printf("Symbol Table\n____________\nLine Number\tVariable Identifier\n");
|
||||
for(i = 0; i < s_table.st_offset; ++i)
|
||||
printf("%2d\t\t%s\n", s_table.pstvr[i].o_line, s_table.pstvr[i].plex);
|
||||
|
||||
return i;
|
||||
}
|
||||
int st_print(STD s_table) {
|
||||
int i;
|
||||
|
||||
/* Store the symbol table to a file named $stable.ste.
|
||||
if (s_table.st_size <= 0) return -1;
|
||||
|
||||
printf("Symbol Table\n____________\nLine Number\tVariable Identifier\n");
|
||||
for (i = 0; i < s_table.st_offset - 1 ; ++i)
|
||||
printf("%2d\t\t%s\n", s_table.pstvr[i].o_line, s_table.pstvr[i].plex);
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
/* Store the symbol table to a file named $stable.ste.
|
||||
It overwrites any existing file named $stable.ste.
|
||||
* Author: Victor Fernandes, 040772243
|
||||
* Version: 0.0.1
|
||||
* Called functions: fopen, fprintf, st_get_type, fclose, printf
|
||||
* Parameters:
|
||||
STD - The symbol table
|
||||
STD - The symbol table
|
||||
* Return value:
|
||||
int - the number of items stored
|
||||
-1 if the file stream cannot be opened
|
||||
int - the number of items stored
|
||||
-1 if the file stream cannot be opened
|
||||
*/
|
||||
int st_store(STD s_table){
|
||||
FILE *out; /* The target file*/
|
||||
int i;
|
||||
int st_store(STD s_table) {
|
||||
FILE *out; /* The target file*/
|
||||
int i;
|
||||
|
||||
/* Windows does not like fopen, and fopen_s is Windows-only. This will ensure the
|
||||
* use of the proper function call if PLATYPUS is being built on a non-windows system.
|
||||
* Best approach is to add _CRT_SECURE_NO_WARNINGS to the preprocessor definitions, but
|
||||
* this works, too.
|
||||
* Best approach is to add _CRT_SECURE_NO_WARNINGS to the preprocessor definitions, but
|
||||
* this works, too.
|
||||
*/
|
||||
#ifdef _WIN32
|
||||
if (fopen_s(&out, ST_FILE_NAME, "w+") != 0 || out == NULL)
|
||||
if (fopen_s(&out, ST_FILE_NAME, "w+") != 0 || out == NULL)
|
||||
#else
|
||||
if ((out = fopen(ST_FILE_NAME, "w+")) == NULL)
|
||||
if ((out = fopen(ST_FILE_NAME, "w+")) == NULL)
|
||||
#endif
|
||||
return -1; /* Can't open file, stop. */
|
||||
|
||||
fprintf(out, "%d", s_table.st_size);
|
||||
fprintf(out, "%d", s_table.st_size);
|
||||
|
||||
for(i = 0; i < s_table.st_size; ++i){
|
||||
fprintf(out, " %4X %d %s %d",
|
||||
s_table.pstvr[i].status_field, /* Status flag */
|
||||
(int)strlen(s_table.pstvr[i].plex), /* Length of lexeme */
|
||||
s_table.pstvr[i].plex, /* The lexeme itself */
|
||||
s_table.pstvr[i].o_line); /* Line number */
|
||||
for (i = 0; i < s_table.st_size; ++i) {
|
||||
fprintf(out, " %4X %d %s %d",
|
||||
s_table.pstvr[i].status_field, /* Status flag */
|
||||
(int)strlen(s_table.pstvr[i].plex), /* Length of lexeme */
|
||||
s_table.pstvr[i].plex, /* The lexeme itself */
|
||||
s_table.pstvr[i].o_line); /* Line number */
|
||||
|
||||
/* Initial value */
|
||||
char type = st_get_type(s_table, i);
|
||||
switch (type){
|
||||
case 'I':
|
||||
case 'F':
|
||||
case 'S':
|
||||
fprintf(out, " %c", type);
|
||||
}
|
||||
}
|
||||
fclose(out);
|
||||
printf("Symbol Table stored\n");
|
||||
return i;
|
||||
/* Initial value */
|
||||
char type = st_get_type(s_table, i);
|
||||
switch (type) {
|
||||
case 'I':
|
||||
case 'F':
|
||||
case 'S':
|
||||
fprintf(out, " %c", type);
|
||||
}
|
||||
}
|
||||
fclose(out);
|
||||
printf("Symbol Table stored\n");
|
||||
return i;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -344,10 +353,10 @@ int st_store(STD s_table){
|
|||
* Parameters: N/A
|
||||
* Return value: N/A
|
||||
*/
|
||||
static void st_setsize(void){
|
||||
sym_table.st_size = 0;
|
||||
static void st_setsize(void) {
|
||||
sym_table.st_size = 0;
|
||||
}
|
||||
|
||||
|
||||
/* Internal function to increment st_offset by 1.
|
||||
* Author: Victor Fernandes, 040772243
|
||||
* Version: 0.0.1
|
||||
|
|
@ -355,8 +364,8 @@ static void st_setsize(void){
|
|||
* Parameters: N/A
|
||||
* Return value: N/A
|
||||
*/
|
||||
static void st_incoffset(void){
|
||||
++sym_table.st_offset;
|
||||
static void st_incoffset(void) {
|
||||
++sym_table.st_offset;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -364,13 +373,13 @@ static void st_incoffset(void){
|
|||
* Author: Victor Fernandes, 040772243
|
||||
* Version: 0.0.1
|
||||
* Called functions:
|
||||
* Parameters:
|
||||
* Parameters:
|
||||
* Return value:
|
||||
* Algorithm:
|
||||
*/
|
||||
int st_sort(STD s_table, char s_order){
|
||||
/* Compiler warning about unused parameter,
|
||||
* this is fine for this "future" implementation
|
||||
*/
|
||||
return 0; /* SYKE! */
|
||||
int st_sort(STD s_table, char s_order) {
|
||||
/* Compiler warning about unused parameter,
|
||||
* this is fine for this "future" implementation
|
||||
*/
|
||||
return 0; /* SYKE! */
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue