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