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Major code overhaul

This commit is contained in:
Augusto Gunsch 2020-11-18 19:53:23 -03:00
parent 92f5fc88e5
commit 8e490746d1
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GPG Key ID: F7EEFE29825C72DC
8 changed files with 497 additions and 335 deletions
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1
.gitignore vendored
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@ -1 +1,2 @@
assembler
tags

9
Makefile
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@ -1,2 +1,7 @@
main: assembler.c
${CC} -std=c99 assembler.c -o assembler
FILES = assembler.c main.c util.c
INCLUDES = -I.
CFLAGS = -std=c99
OUTFILE = assembler
main: ${FILES}
${CC} ${CFLAGS} ${FILES} -o ${OUTFILE}

599
assembler.c
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@ -3,103 +3,61 @@
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdbool.h>
#include "tables.h"
#include "assembler.h"
#include "util.h"
#define RAM_LIMIT 24577
#define TOP_VAR 16383
#define BOT_VAR 16
#define ADD_STR_SIZE 7
#define INST_SIZE 17
#define C_TOKEN_SIZE 4
#define INST_LIMIT 32768
void expandsymbols(SYMBOLARRAY* a, int toaddn);
void pushsymbol(SYMBOLARRAY* a, SYMBOL* s);
void freesymbol(SYMBOL* s);
SYMBOL* mksymbol(char* name, int namesize, int val);
int getsymbol(ASSEMBLER* a, char* name);
void skipln(ASSEMBLER* a);
void readrest(ASSEMBLER* a, int trueln);
int isvar(char* var);
void initsymbols(SYMBOLARRAY* s);
ASSEMBLER* mkassembler(FILE* input);
void populatevars(ASSEMBLER* a);
SYMBOL* readlabel(ASSEMBLER* a, int trueln);
void chop(ASSEMBLER* a);
void replacevar(SYMBOL* ln, int val);
void preprocess(ASSEMBLER* a);
void transa(SYMBOL* ln);
char* lookctable(TABLE* t, bool cond, char* token, const char* fieldname, int trueln);
void transb(SYMBOL* ln);
void translate(ASSEMBLER* a);
void gatherinfo(ASSEMBLER* a);
void freeassembler(ASSEMBLER* a);
#define CMP_SIZE 8
#define CMP_TABLE_SIZE 37
const char* cmptable[CMP_TABLE_SIZE] =
{
"0", "0101010",
"1", "0111111",
"-1", "0111010",
"D", "0001100",
"A", "0110000",
"!D", "0001101",
"!A", "0110001",
"-D", "0001111",
"-A", "0110011",
"D+1", "0011111",
"1+D", "0011111",
"A+1", "0110111",
"1+A", "0110111",
"D-1", "0001110",
"A-1", "0110010",
"D+A", "0000010",
"A+D", "0000010",
"D-A", "0010011",
"A-D", "0000111",
"D&A", "0000000",
"A&D", "0000000",
"D|A", "0010101",
"A|D", "0010101",
"M", "1110000",
"!M", "1110001",
"-M", "1110011",
"M+1", "1110111",
"1+M", "1110111",
"M-1", "1110010",
"D+M", "1000010",
"M+D", "1000010",
"D-M", "1010011",
"M-D", "1000111",
"D&M", "1000000",
"M&D", "1000000",
"D|M", "1010101"
"M|D", "1010101"
};
#define DEST_SIZE 4
#define DEST_TABLE_SIZE 7
const char* desttable[] =
{
"M", "001",
"D", "010",
"MD", "011",
"A", "100",
"AM", "101",
"AD", "110",
"AMD", "111"
};
#define JMP_SIZE 4
#define JMP_TABLE_SIZE 7
const char* jmptable[] =
{
"JGT", "001",
"JEQ", "010",
"JGE", "011",
"JLT", "100",
"JNE", "101",
"JLE", "110",
"JMP", "111"
};
struct symbol {
char* name;
int value;
};
struct line {
char* ln;
int truen;
};
void freesymbols(struct symbol** symbols, int symbolsind) {
for(int i = 0; i < symbolsind; i++) {
free(symbols[i]->name);
free(symbols[i]);
void expandsymbols(SYMBOLARRAY* a, int toaddn) {
int sum = a->count + toaddn;
if(sizeof(SYMBOL*) * sum > a->size) {
a->size = sizeof(SYMBOL*) * sum * 3;
a->items = (SYMBOL**)realloc(a->items, a->size);
}
}
struct symbol* mksymb(char* name, int namesize, int val) {
struct symbol* s = (struct symbol*)malloc(sizeof(struct symbol));
void pushsymbol(SYMBOLARRAY* a, SYMBOL* s) {
expandsymbols(a, 1);
a->items[a->count] = s;
a->count++;
}
void freesymbol(SYMBOL* s) {
free(s->name);
free(s);
}
void freesymbols(SYMBOLARRAY* a) {
for(int i = 0; i < a->count; i++)
freesymbol(a->items[i]);
free(a->items);
free(a);
}
SYMBOL* mksymbol(char* name, int namesize, int val) {
SYMBOL* s = (SYMBOL*)malloc(sizeof(SYMBOL));
char* heapname = (char*)malloc(namesize);
strcpy(heapname, name);
s->name = heapname;
@ -107,39 +65,39 @@ struct symbol* mksymb(char* name, int namesize, int val) {
return s;
}
int getsymb(char* symb, struct symbol** vars, int varscount, struct symbol** labels, int labelscount) {
for(int i = 0; i < varscount; i++)
if(strcmp(vars[i]->name, symb) == 0)
return vars[i]->value;
int getsymbol(ASSEMBLER* a, char* name) {
for(int i = 0; i < a->vars->count; i++)
if(strcmp(a->vars->items[i]->name, name) == 0)
return a->vars->items[i]->value;
for(int i = 0; i < labelscount; i++)
if(strcmp(labels[i]->name, symb) == 0)
return labels[i]->value;
for(int i = 0; i < a->labels->count; i++)
if(strcmp(a->labels->items[i]->name, name) == 0)
return a->labels->items[i]->value;
return -1;
}
void skipln(FILE* input) {
void skipln(ASSEMBLER* a) {
char c;
while(c = fgetc(input), c != -1)
while(c = fgetc(a->input), c != -1)
if(c == '\n')
break;
}
void readrest(FILE* input, int trueln) {
void readrest(ASSEMBLER* a, int trueln) {
char c;
while(c = fgetc(input), c != -1) {
while(c = fgetc(a->input), c != -1) {
if(c == '\n')
break;
if(isspace(c))
continue;
if(c == '/') {
char nc = fgetc(input);
char nc = fgetc(a->input);
if(nc == '/') {
skipln(input);
skipln(a);
break;
}
ungetc(nc, input);
ungetc(nc, a->input);
}
fprintf(stderr, "Unexpected '%c' at line '%i'\n", c, trueln);
exit(1);
@ -158,96 +116,84 @@ int isvar(char* var) {
return 0;
}
void populatevars(struct symbol** vars, int* varscount) {
// First five
void initsymbols(SYMBOLARRAY* s) {
s->size = s->count * sizeof(SYMBOL*);
s->items = (SYMBOL**)malloc(s->size);
s->count = 0;
}
ASSEMBLER* mkassembler(FILE* input) {
ASSEMBLER* a = (ASSEMBLER*)malloc(sizeof(ASSEMBLER));
a->lns = (SYMBOLARRAY*)malloc(sizeof(SYMBOLARRAY));
a->labels = (SYMBOLARRAY*)malloc(sizeof(SYMBOLARRAY));
a->vars = (SYMBOLARRAY*)malloc(sizeof(SYMBOLARRAY));
a->input = input;
gatherinfo(a);
initsymbols(a->lns);
initsymbols(a->labels);
a->vars->count = 80; // arbitrary number for initial size
initsymbols(a->vars);
populatevars(a);
chop(a);
return a;
}
void populatevars(ASSEMBLER* a) {
const int firstamnt = 5;
const int ramvamnt = 16; //max: 19
const int specialamt = 2;
const int sum = firstamnt + ramvamnt + specialamt;
// realloc if necessary
expandsymbols(a->vars, sum);
// update varscount to new index
a->vars->count = sum;
// first five
char* labels[] = { "SP", "LCL", "ARG", "THIS", "THAT" };
for(int i = 0; i < firstamnt; i++) {
vars[i] = mksymb(labels[i], strlen(labels[i])+1, i);
a->vars->items[i] = mksymbol(labels[i], strlen(labels[i])+1, i);
}
// RAM variables (R0-R15)
const int ramvamnt = 16; //max: 19
const int asciioff = 48;
char ramvname[4];
ramvname[0] = 'R';
ramvname[2] = '\0';
for(int i = 0; i < (ramvamnt/10)*10; i++) {
int tmptarg = (ramvamnt/10)*10;
for(int i = 0; i < tmptarg; i++) {
ramvname[1] = (char)(i+asciioff);
vars[firstamnt+i] = mksymb(ramvname, 3, i);
a->vars->items[firstamnt+i] = mksymbol(ramvname, 3, i);
}
ramvname[1] = '1';
ramvname[3] = '\0';
for(int i = 10; i < ramvamnt; i++) {
ramvname[2] = (char)((i%10)+asciioff);
vars[firstamnt+i] = mksymb(ramvname, 4, i);
a->vars->items[firstamnt+i] = mksymbol(ramvname, 4, i);
}
// SCREEN var
vars[firstamnt+ramvamnt] = mksymb("SCREEN", 7, 16384);
a->vars->items[firstamnt+ramvamnt] = mksymbol("SCREEN", 7, 16384);
// KBD var
vars[firstamnt+ramvamnt+1] = mksymb("KBD", 4, 24576);
// update varscount to new index
*varscount = firstamnt+ramvamnt+2;
a->vars->items[firstamnt+ramvamnt+1] = mksymbol("KBD", 4, 24576);
}
void gatherinfo(FILE* input, int* lnscount, int* labelscount, int* maxwidth) {
char c;
unsigned char readsmt = 0;
unsigned char comment = 0;
int truelnscount = 1;
int lnwidth = 1;
while(c = fgetc(input), c != -1) {
if(c == '\n') {
truelnscount++;
comment = 0;
if(lnwidth > *maxwidth)
*maxwidth = lnwidth;
if(readsmt) {
if(*lnscount == INST_LIMIT) {
fprintf(stderr, "Reached instruction limit (%i); line %i\n", INST_LIMIT, truelnscount);
exit(1);
}
(*lnscount)++;
}
readsmt = 0;
lnwidth = 1;
continue;
}
if(comment)
continue;
if(c == '(') {
(*labelscount)++;
comment = 1;
continue;
}
if(c == '/') {
char nc = fgetc(input);
if(nc == '/') {
comment = 1;
continue;
}
ungetc(nc, input);
}
if(isspace(c)) {
continue;
}
readsmt = 1;
lnwidth++;
}
rewind(input);
}
struct symbol* readlabel(FILE* input, int ln, int trueln, int lnwidth) {
char* name = (char*)malloc(sizeof(char)*(lnwidth-1));
SYMBOL* readlabel(ASSEMBLER* a, int trueln) {
char* name = (char*)malloc(sizeof(char)*(a->maxwidth-1));
int i = 0;
char c;
while(c = fgetc(input), c != -1) {
int maxind = a->maxwidth-2;
while(c = fgetc(a->input), c != -1) {
if(c == ')')
break;
if(i == lnwidth-2) {
if(i == maxind) {
fprintf(stderr, "Label width bigger than the maximum (%i characters); line %i\n",
lnwidth-2, trueln+1);
maxind, trueln+1);
exit(1);
}
if(c == '\n') {
@ -262,28 +208,29 @@ struct symbol* readlabel(FILE* input, int ln, int trueln, int lnwidth) {
i++;
}
name[i] = '\0';
readrest(input, trueln);
struct symbol* l = (struct symbol*)malloc(sizeof(struct symbol));
readrest(a, trueln);
SYMBOL* l = (SYMBOL*)malloc(sizeof(SYMBOL));
l->name = name;
l->value = ln;
l->value = a->lns->count;
return l;
}
// 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 lnwidth) {
void chop(ASSEMBLER* a) {
char c;
char tmpln[lnwidth];
char tmpln[a->maxwidth];
int lnind = 0;
int lnscount = 0;
int truelnscount = 1;
int lnind = 0;
int comment = 0;
int spacedln = 0;
while(c = fgetc(input), c != -1) {
bool comment = false;
bool spacedln = false;
while(c = fgetc(a->input), c != -1) {
if(c == '\n') {
if(comment) {
comment = 0;
ungetc(c, input);
comment = false;
ungetc(c, a->input);
continue;
}
truelnscount++;
@ -292,16 +239,11 @@ int chop(FILE* input, struct symbol** vars, int varscount, struct symbol** label
tmpln[lnind] = '\0';
char* newln = (char*)malloc(sizeof(char)*(lnind+1));
strcpy(newln, tmpln);
struct line* s = (struct line*)malloc(sizeof(struct line));
s->ln = newln;
s->truen = truelnscount;
lns[lnscount] = s;
pushsymbol(a->lns, mksymbol(tmpln, lnind+1, truelnscount));
lnscount++;
lnind = 0;
spacedln = 0;
spacedln = false;
lnscount++;
continue;
}
@ -310,35 +252,34 @@ int chop(FILE* input, struct symbol** vars, int varscount, struct symbol** label
if(isspace(c)) {
if(lnind)
spacedln = 1;
spacedln = true;
continue;
}
if(c == '(') {
if(lnind != 0) {
if(lnind) {
fprintf(stderr, "Unexpected char '%c'; line %i:%i\n", c, truelnscount, lnind+1);
exit(1);
}
struct symbol* l = readlabel(input, lnscount, truelnscount, lnwidth);
if(getsymb(l->name, vars, varscount, labels, *labelscount) != -1) {
SYMBOL* l = readlabel(a, truelnscount);
if(getsymbol(a, l->name) != -1) {
fprintf(stderr, "Already defined symbol '%s'; line %i\n", l->name, truelnscount);
exit(1);
}
labels[*labelscount] = l;
(*labelscount)++;
pushsymbol(a->labels, l);
truelnscount++;
continue;
}
if(c == '/') {
char nc = fgetc(input);
char nc = fgetc(a->input);
if(nc == '/') {
comment = 1;
comment = true;
continue;
}
ungetc(nc, input);
ungetc(nc, a->input);
}
if(spacedln) {
@ -346,91 +287,98 @@ int chop(FILE* input, struct symbol** vars, int varscount, struct symbol** label
exit(1);
}
if(lnwidth-1 == lnind) {
fprintf(stderr, "Reached line width limit (%i); line %i\n", lnwidth, lnscount+1);
exit(1);
}
tmpln[lnind] = c;
lnind++;
}
return lnscount;
fclose(a->input);
}
void replacevar(struct line* ln, int val) {
free(ln->ln);
char* newln = (char *)malloc(sizeof(char)*ADD_STR_SIZE);
snprintf(newln, ADD_STR_SIZE, "@%i", val);
ln->ln = newln;
void replacevar(SYMBOL* ln, int val) {
free(ln->content);
int size = sizeof(char)*(countplaces(val) + 2);
char* newln = (char *)malloc(size);
snprintf(newln, size, "@%i", val);
ln->content = newln;
}
void stripvars(struct symbol** vars, int* varscount, struct symbol** labels, int* labelscount, struct line** lns, int lnscount) {
int varsramind = BOT_VAR;
for(int i = 0; i < lnscount; i++) {
if(lns[i]->ln[0] == '@') {
char* afterat = lns[i]->ln+sizeof(char);
void preprocess(ASSEMBLER* a) {
int varsramind = BOTTOM_VAR;
for(int i = 0; i < a->lncount; i++) {
if(a->lns->items[i]->content[0] == '@') {
char* afterat = a->lns->items[i]->content+sizeof(char);
if(isvar(afterat)) {
int val = getsymb(afterat, vars, *varscount, labels, *labelscount);
int val = getsymbol(a, afterat);
if(val == -1) {
if(varsramind == RAM_LIMIT) {
fprintf(stderr, "Variable amount reached RAM limit (%i); line %i\n", RAM_LIMIT, lns[i]->truen);
fprintf(stderr, "Variable amount reached RAM limit (%i); line %i\n", RAM_LIMIT, a->lns->items[i]->truen);
exit(1);
}
struct symbol* var = mksymb(afterat, strlen(afterat)+1, varsramind);
vars[*varscount] = var;
(*varscount)++;
SYMBOL* var = mksymbol(afterat, strlen(afterat)+1, varsramind);
varsramind++;
pushsymbol(a->vars, var);
val = var->value;
}
replacevar(lns[i], val);
replacevar(a->lns->items[i], val);
}
}
}
}
void transa(char* in, char* out, int trueln) {
int add = atoi(in+sizeof(char));
void transa(SYMBOL* ln) {
int add = atoi(ln->content+sizeof(char));
if(add >= INST_LIMIT) {
fprintf(stderr, "'A' instruction cannot reference addresses bigger than %i; line %i\n", INST_LIMIT-1, trueln);
fprintf(stderr, "'A' instruction cannot reference addresses bigger than %i; line %i\n", INST_LIMIT-1, ln->truen);
exit(1);
}
char* out = (char*)malloc(sizeof(char) * INST_SIZE);
int lastbit = 1 << 15;
for(int i = INST_SIZE-2;i > 0; i--) {
for(int i = INST_SIZE-2; i > 0; i--) {
if(add & (lastbit >> i))
out[i] = '1';
else
out[i] = '0';
}
out[INST_SIZE-1] = '\0';
out[0] = '0';
free(ln->content);
ln->content = out;
}
void lookctable(char* out, int outsize, const char** table, int tablesize, int cond, char* token, const char* fieldname, int trueln) {
char* lookctable(TABLE* t, bool cond, char* token, const char* fieldname, int trueln) {
char* out = (char*)malloc(t->instsize);
if(!cond) {
for(int i = 0; i < outsize-1; i++)
int targsize = t->instsize - 1;
for(int i = 0; i < targsize; i++)
out[i] = '0';
out[outsize-1] = '\0';
return;
out[t->instsize-1] = '\0';
return out;
}
for(int i = 0; i < tablesize; i++)
if(strcmp(table[2*i], token) == 0) {
strcpy(out, table[(2*i)+1]);
return;
for(int i = 0; i < t->size; i++)
if(strcmp(t->table[2*i], token) == 0) {
strcpy(out, t->table[(2*i)+1]);
return out;
}
fprintf(stderr, "Unexpected token '%s' for %s field; line %i\n", token, fieldname, trueln);
exit(1);
}
void transb(char* in, char* out, int trueln) {
int hasjmp = 0;
int hasdest = 0;
int hascmp = 0;
void transb(SYMBOL* ln) {
bool hasjmp = false;
bool hasdest = false;
bool hascmp = false;
int i = 0;
int tmpi = 0;
char tmp[C_TOKEN_SIZE], dest[C_TOKEN_SIZE], cmp[C_TOKEN_SIZE], jmp[C_TOKEN_SIZE];
while(1) {
if(in[i] == '\0') {
if(ln->content[i] == '\0') {
tmp[tmpi] = '\0';
if(hasjmp)
strcpy(jmp, tmp);
@ -440,22 +388,22 @@ void transb(char* in, char* out, int trueln) {
}
if(tmpi == C_TOKEN_SIZE-1) {
fprintf(stderr, "Unexpected char '%c'; line %i:%i;\n", in[i], trueln, i+1);
fprintf(stderr, "Unexpected char '%c'; line %i:%i;\n", ln->content[i], ln->truen, i+1);
exit(1);
}
if(in[i] == '=' && !hasdest && hascmp) {
hascmp = 0;
hasdest = 1;
if(ln->content[i] == '=' && !hasdest && hascmp) {
hascmp = false;
hasdest = true;
tmp[tmpi] = '\0';
strcpy(dest, tmp);
tmpi = 0;
i++;
continue;
}
if(in[i] == ';' && !hasjmp && hascmp) {
hascmp = 0;
hasjmp = 1;
if(ln->content[i] == ';' && !hasjmp && hascmp) {
hascmp = false;
hasjmp = true;
tmp[tmpi] = '\0';
strcpy(cmp, tmp);
tmpi = 0;
@ -464,105 +412,90 @@ void transb(char* in, char* out, int trueln) {
}
hascmp = 1;
tmp[tmpi] = in[i];
tmp[tmpi] = ln->content[i];
tmpi++;
i++;
}
char rawdest[DEST_SIZE];
lookctable(rawdest, DEST_SIZE, desttable, DEST_TABLE_SIZE, hasdest, dest, "dest", trueln);
char rawjmp[JMP_SIZE];
lookctable(rawjmp, JMP_SIZE, jmptable, JMP_TABLE_SIZE, hasjmp, jmp, "jump", trueln);
char rawcmp[CMP_SIZE];
lookctable(rawcmp, CMP_SIZE, cmptable, CMP_TABLE_SIZE, 1, cmp, "comp", trueln);
sprintf(out, "111%s%s%s", rawcmp, rawdest, rawjmp);
char* rawdest = lookctable(&desttable, hasdest, dest, "dest", ln->truen);
char* rawjmp = lookctable(&jmptable, hasjmp, jmp, "jump", ln->truen);
char* rawcmp = lookctable(&cmptable, 1, cmp, "comp", ln->truen);
int sz = sizeof(char) * INST_SIZE;
char* out = (char*)malloc(sz);
snprintf(out, sz, "111%s%s%s", rawcmp, rawdest, rawjmp);
free(ln->content);
ln->content = out;
free(rawdest);
free(rawjmp);
free(rawcmp);
}
char** translate(struct line** lns, int lnscount) {
char** assembled = (char**)malloc(sizeof(char*)*lnscount);
for(int i = 0; i < lnscount; i++)
assembled[i] = (char*)malloc(sizeof(char)*INST_SIZE);
for(int i = 0; i < lnscount; i++)
if(lns[i]->ln[0] == '@')
transa(lns[i]->ln, assembled[i], lns[i]->truen);
void translate(ASSEMBLER* a) {
for(int i = 0; i < a->lns->count; i++)
if(a->lns->items[i]->content[0] == '@')
transa(a->lns->items[i]);
else
transb(lns[i]->ln, assembled[i], lns[i]->truen);
return assembled;
transb(a->lns->items[i]);
}
void getoutname(char* fname, int fnamelen, char* outf) {
strcpy(outf, fname);
strcpy(outf+(fnamelen*sizeof(char))-(3*sizeof(char)), "hack");
void gatherinfo(ASSEMBLER* a) {
char c;
bool readsmt = false;
bool comment = false;
int lnwidth = 1;
a->truelnscount = 1;
a->maxwidth = 0;
a->labels->count = 0;
a->lns->count = 0;
while(c = fgetc(a->input), c != -1) {
if(c == '\n') {
a->truelnscount++;
comment = false;
if(lnwidth > a->maxwidth)
a->maxwidth = lnwidth;
if(readsmt) {
if(a->lns->count == INST_LIMIT) {
fprintf(stderr, "Reached instruction limit (%i); line %i\n", INST_LIMIT, a->truelnscount);
exit(1);
}
a->lns->count++;
}
readsmt = false;
lnwidth = 1;
continue;
}
if(comment)
continue;
if(c == '(') {
a->labels->count++;
comment = true;
continue;
}
if(c == '/') {
char nc = fgetc(a->input);
if(nc == '/') {
comment = true;
continue;
}
ungetc(nc, a->input);
}
if(isspace(c)) {
continue;
}
readsmt = true;
lnwidth++;
}
rewind(a->input);
a->lncount = a->lns->count;
}
int main(int argc, char* argv[]) {
if(argc < 2) {
printf("Usage: %s {input}\n", argv[0]);
return 1;
}
int fnamelen = strlen(argv[1]);
int invalidext = strcmp(argv[1]+(fnamelen*sizeof(char)-(4*sizeof(char))), ".asm");
if(invalidext) {
fprintf(stderr, "Invalid extension (must be *.asm)\n");
return 1;
}
FILE* input = fopen(argv[1], "r");
if(input == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
return errno;
}
// info gathering
int lnscount = 0;
int labelscount = 0;
int lnwidth = 0;
gatherinfo(input, &lnscount, &labelscount, &lnwidth);
struct line** lns = (struct line**)malloc(sizeof(struct line*)*lnscount); // has to be on the heap; can be huge and cause a stack overflow
// line chopping
struct symbol** labels = (struct symbol**)malloc(sizeof(struct symbol*)*labelscount); // same for this one
labelscount = 0;
struct symbol* vars[TOP_VAR - BOT_VAR];
int varscount = 0;
populatevars(vars, &varscount);
lnscount = chop(input, vars, varscount, labels, &labelscount, lns, lnwidth);
fclose(input);
// variable substitution
stripvars(vars, &varscount, labels, &labelscount, lns, lnscount);
freesymbols(vars, varscount);
freesymbols(labels, labelscount);
free(labels);
// actual translation
char** bin = translate(lns, lnscount);
for(int i = 0; i < lnscount; i++) {
free(lns[i]->ln);
free(lns[i]);
}
free(lns);
// file output
char outf[fnamelen+2];
getoutname(argv[1], fnamelen, outf);
FILE* output = fopen(outf, "w");
if(output == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
return errno;
}
for(int i = 0; i < lnscount; i++) {
fprintf(output, "%s\n", bin[i]);
free(bin[i]);
}
free(bin);
fclose(output);
return 0;
void freeassembler(ASSEMBLER* a) {
freesymbols(a->lns);
freesymbols(a->vars);
freesymbols(a->labels);
free(a);
}

47
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#ifndef ASSEMBLER_H
#define ASSEMBLER_H
#include <stdio.h>
#define RAM_LIMIT 24577
#define TOP_VAR 16383
#define BOTTOM_VAR 16
#define INST_SIZE 17
#define C_TOKEN_SIZE 4
#define INST_LIMIT 1<<15
typedef struct {
union {
char* name;
char* content;
};
union {
int value;
int truen;
};
} SYMBOL;
typedef struct {
SYMBOL** items;
int count;
int size;
} SYMBOLARRAY;
typedef struct {
FILE* input;
int maxwidth;
int truelnscount;
int lncount;
SYMBOLARRAY* lns;
SYMBOLARRAY* labels;
SYMBOLARRAY* vars;
} ASSEMBLER;
ASSEMBLER* mkassembler(FILE* input);
void preprocess(ASSEMBLER* a);
void translate(ASSEMBLER* a);
void freeassembler(ASSEMBLER* a);
#endif

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#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "assembler.h"
char* getoutname(char* fname, int fnamelen) {
char* outf = (char*)malloc(sizeof(char) * fnamelen + 2);
strcpy(outf, fname);
// .hack
strcpy( (outf + ((fnamelen * sizeof(char)) - (3 * sizeof(char)))), "hack");
return outf;
}
int main(int argc, char* argv[]) {
if(argc < 2) {
printf("Usage: %s {input}\n", argv[0]);
return 1;
}
int fnamelen = strlen(argv[1]);
int invalidext = strcmp(argv[1]+(fnamelen*sizeof(char)-(4*sizeof(char))), ".asm");
if(invalidext) {
fprintf(stderr, "Invalid extension (must be named lide Xxx.asm)\n");
return 1;
}
FILE* input = fopen(argv[1], "r");
if(input == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
return errno;
}
ASSEMBLER* a = mkassembler(input);
// variable substitution
preprocess(a);
// actual translation
translate(a);
// file output
char* outf = getoutname(argv[1], fnamelen);
FILE* output = fopen(outf, "w");
if(output == NULL) {
fprintf(stderr, "%s\n", strerror(errno));
return errno;
}
for(int i = 0; i < a->lns->count; i++) {
fprintf(output, "%s\n", a->lns->items[i]->content);
}
free(outf);
freeassembler(a);
fclose(output);
return 0;
}

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#ifndef TABLES
#define TABLES
typedef struct {
const char** table;
const int size;
const int instsize;
} TABLE;
const char* cmptablestrs[] = {
"0", "0101010",
"1", "0111111",
"-1", "0111010",
"D", "0001100",
"A", "0110000",
"!D", "0001101",
"!A", "0110001",
"-D", "0001111",
"-A", "0110011",
"D+1", "0011111",
"1+D", "0011111",
"A+1", "0110111",
"1+A", "0110111",
"D-1", "0001110",
"A-1", "0110010",
"D+A", "0000010",
"A+D", "0000010",
"D-A", "0010011",
"A-D", "0000111",
"D&A", "0000000",
"A&D", "0000000",
"D|A", "0010101",
"A|D", "0010101",
"M", "1110000",
"!M", "1110001",
"-M", "1110011",
"M+1", "1110111",
"1+M", "1110111",
"M-1", "1110010",
"D+M", "1000010",
"M+D", "1000010",
"D-M", "1010011",
"M-D", "1000111",
"D&M", "1000000",
"M&D", "1000000",
"D|M", "1010101",
"M|D", "1010101"
};
TABLE cmptable =
{
.table = cmptablestrs,
.size = sizeof(cmptablestrs) / sizeof(char*) / 2,
.instsize = 8 * sizeof(char)
};
const char* desttablestrs[] = {
"M", "001",
"D", "010",
"MD", "011",
"A", "100",
"AM", "101",
"AD", "110",
"AMD", "111"
};
TABLE desttable =
{
.table = desttablestrs,
.size = sizeof(desttablestrs) / sizeof(char*) / 2,
.instsize = 4 * sizeof(char)
};
const char* jmptablestrs[] = {
"JGT", "001",
"JEQ", "010",
"JGE", "011",
"JLT", "100",
"JNE", "101",
"JLE", "110",
"JMP", "111"
};
TABLE jmptable =
{
.table = jmptablestrs,
.size = sizeof(jmptablestrs) / sizeof(char*) / 2,
.instsize = 4 * sizeof(char)
};
#endif

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#include <string.h>
#include <stdlib.h>
#include "util.h"
char* heapstr(const char* str, int len) {
int sz = sizeof(char) * (len + 1);
char* outstr = (char*)malloc(sz);
strcpy(outstr, str);
return outstr;
}
int countplaces(int n) {
int places = 1;
int divisor = 1;
if(n < 0) {
n = -n;
places++;
}
while(n / divisor >= 10) {
places++;
divisor *= 10;
}
return places;
}

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#ifndef UTIL_H
#define UTIL_H
char* heapstr(const char* str, int len);
int countplaces(int n);
#endif