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Memory management 

Reallocation error mitigation, st_lookup improvement
This commit is contained in:
Victor Fernandes 2017-04-10 11:33:16 -04:00
parent fcb082a9de
commit 05b430c346
2 changed files with 28 additions and 18 deletions
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2
buffer.h
View File

@ -22,7 +22,7 @@
/* standard header files */
#include <stdio.h> /* standard input/output */
#ifdef MACOS_DEP
#ifndef WIN32
#include <mm_malloc.h> /* for dynamic memory allocation.*/
#else
#include <malloc.h>

44
stable.c
View File

@ -9,6 +9,12 @@
*/
#include "stable.h"
#define PLSBD_SZ 256
#define PLSBD_INC 8
#define DEBUG
/*#undef DEBUG*/
/* Forward function declarations */
static void st_setsize(void);
static void st_incoffset(void);
@ -32,7 +38,7 @@ STD st_create(int st_size){
if (st_size <= 0 || (new_stable.pstvr == NULL)) {
new_stable.st_size = 0;
}
new_stable.plsBD = b_create(100, 1, 'a');
new_stable.plsBD = b_create(PLSBD_SZ, PLSBD_INC, 'a');
if (new_stable.plsBD == NULL) {
free(new_stable.plsBD);
new_stable.st_size = 0;
@ -59,7 +65,8 @@ STD st_create(int st_size){
* Algorithm:
*/
int st_install(STD s_table, char *lexeme, char type, int line){
unsigned int offset, i;
unsigned int offset, i, j, lex_len;
short bd_offset, flag;
/* Cannot add new entry, table full */
if (s_table.st_offset >= s_table.st_size)
@ -71,12 +78,22 @@ int st_install(STD s_table, char *lexeme, char type, int line){
return offset;
/* Add lexeme to the symbol table's lexeme buffer */
for (i = 0; i < strlen(lexeme); ++i){
lex_len = strlen(lexeme);
for (i = 0; i <= lex_len; ++i){
if (!b_addc(s_table.plsBD, lexeme[i]))
return -1;
if (b_rflag(s_table.plsBD) == SET_R_FLAG){ /* COPY NEW ADDRESSES TO PLEX ENTRIES */
flag = 1;
}
if (!b_addc(s_table.plsBD, '\0'))
return -1;
}
if (flag == 1){
bd_offset = 0;
for (j = 0; j <= s_table.st_offset; ++i){
s_table.pstvr[j].plex = b_setmark(s_table.plsBD, bd_offset + s_table.pstvr[j].i_value.str_offset);
bd_offset += s_table.pstvr[j].i_value.str_offset + 1; /*Add one because the offset doesn't include '\0' */
}
}
/* Set proper pointer values on symbol table */
s_table.pstvr[s_table.st_offset].plex = b_setmark(s_table.plsBD, b_size(s_table.plsBD));
@ -103,11 +120,6 @@ int st_install(STD s_table, char *lexeme, char type, int line){
return -1; /* Not supposed to fall into here */
}
/* TODO: Handle reallocation flag behaviour*/
if (b_rflag(s_table.plsBD) == SET_R_FLAG){
printf("memory got tossed around\n");
}
/* Increment the symbol table offset */
st_incoffset();
@ -127,17 +139,15 @@ int st_install(STD s_table, char *lexeme, char type, int line){
-1 if no element was found
*/
int st_lookup(STD s_table, char *lexeme){
int idx, i; /* idx: index location for symbol table, i: increment counter*/
char *store;
int i; /* idx: index location for symbol table, i: increment counter*/
store = b_setmark(s_table.plsBD, 0); /* Get head of the lexeme storage */
for (i = 0, idx = 0; i < s_table.st_offset; ++i) {
if (strncmp(lexeme, store + idx, strlen(lexeme)) == 0)
for (i = s_table.st_offset; i >= 0; --i) {
if (strcmp(lexeme, s_table.pstvr[i].plex) == 0)
return i;
else
idx+= (short)(strlen(store + idx) + 1);
}
#ifdef DEBUG
printf("found nothing\n");
#endif
return -1; /* Found nothing */
}