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hack-assembler
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Improve memory usage

This commit is contained in:
Augusto Gunsch 2020-10-25 09:23:17 -03:00
parent ec5d89a8bd
commit 189ad12481
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GPG Key ID: F7EEFE29825C72DC
1 changed files with 40 additions and 18 deletions
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56
assembler.c
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@ -4,8 +4,6 @@
#include <stdlib.h>
#include <ctype.h>
#define LN_WIDTH 500
#define SYMBOL_WIDTH 500
#define RAM_LIMIT 24576
#define TOP_VAR 16383
#define BOT_VAR 16
@ -182,29 +180,51 @@ void populatevars(struct symbol** vars, int* varscount) {
*varscount = firstamnt+ramvamnt+2;
}
void countstuff(FILE* input, int* lnscount, int* labelscount) {
void gatherinfo(FILE* input, int* lnscount, int* labelscount, int* maxwidth) {
char c;
unsigned char readsmt = 0;
int lnwidth = 1;
while(c = fgetc(input), c != -1) {
if(c == '\n') {
if(lnwidth > *maxwidth)
*maxwidth = lnwidth;
if(readsmt)
(*lnscount)++;
readsmt = 0;
lnwidth = 1;
continue;
}
if(c == '(')
if(c == '(') {
(*labelscount)++;
continue;
}
if(c == '/') {
char nc = fgetc(input);
if(nc == '/') {
skipln(input);
continue;
}
ungetc(nc, input);
}
if(isspace(c)) {
continue;
}
readsmt = 1;
lnwidth++;
}
rewind(input);
}
struct symbol* readlabel(FILE* input, int ln, int trueln) {
char* name = (char*)malloc(sizeof(char)*(SYMBOL_WIDTH+1));
struct symbol* readlabel(FILE* input, int ln, int trueln, int lnwidth) {
char* name = (char*)malloc(sizeof(char)*(lnwidth-1));
int i = 0;
char c;
while(c = fgetc(input), c != -1) {
if(c == ')')
break;
if(i == SYMBOL_WIDTH) {
if(i == lnwidth-2) {
fprintf(stderr, "Label width bigger than the maximum (%i characters); line %i\n",
SYMBOL_WIDTH, trueln+1);
lnwidth-2, trueln+1);
exit(1);
}
if(c == '\n') {
@ -228,9 +248,9 @@ struct symbol* readlabel(FILE* input, int ln, int trueln) {
// Splits the stream into an array of strings, stripping comments, white spaces and labels
// Requires vars array to check for duplicate symbols, but doesn't modify it
int chop(FILE* input, struct symbol** vars, int varscount, struct symbol** labels, int* labelscount, struct line** lns) {
int chop(FILE* input, struct symbol** vars, int varscount, struct symbol** labels, int* labelscount, struct line** lns, int lnwidth) {
char c;
char tmpln[LN_WIDTH];
char tmpln[lnwidth];
int lnscount = 0;
int truelnscount = 1;
int lnind = 0;
@ -277,7 +297,7 @@ int chop(FILE* input, struct symbol** vars, int varscount, struct symbol** label
exit(1);
}
struct symbol* l = readlabel(input, lnscount, truelnscount);
struct symbol* l = readlabel(input, lnscount, truelnscount, lnwidth);
if(getsymb(l->name, vars, varscount, labels, *labelscount) != -1) {
fprintf(stderr, "Already defined symbol '%s'; line %i\n", l->name, truelnscount);
exit(1);
@ -303,8 +323,8 @@ int chop(FILE* input, struct symbol** vars, int varscount, struct symbol** label
exit(1);
}
if(LN_WIDTH-1 == lnind) {
fprintf(stderr, "Reached line width limit (%i); line %i\n", LN_WIDTH, lnscount+1);
if(lnwidth-1 == lnind) {
fprintf(stderr, "Reached line width limit (%i); line %i\n", lnwidth, lnscount+1);
exit(1);
}
@ -468,12 +488,14 @@ int main(int argc, char* argv[]) {
return errno;
}
// line chopping
// info gathering
int lnscount = 0;
int labelscount = 0;
countstuff(input, &lnscount, &labelscount);
struct line* lns[lnscount]; // some lines will be empty/comments/labels, so this array is bigger than needed
int lnwidth = 0;
gatherinfo(input, &lnscount, &labelscount, &lnwidth);
struct line* lns[lnscount];
// line chopping
struct symbol* labels[labelscount];
labelscount = 0;
@ -481,7 +503,7 @@ int main(int argc, char* argv[]) {
int varscount = 0;
populatevars(vars, &varscount);
lnscount = chop(input, vars, varscount, labels, &labelscount, lns); // let's forget those empty lines
lnscount = chop(input, vars, varscount, labels, &labelscount, lns, lnwidth);
fclose(input);
// variable substitution