vm-translator/translator.c

464 lines
11 KiB
C

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "translator.h"
#include "templates.h"
#define CMPLIMIT 9999
#define CMPLEN 4
void pushtoclean(struct Translator* t, char* topush) {
int nextsz = sizeof(char*)*(t->tocleanind+1);
if(nextsz >= t->tocleansize) {
t->tocleansize = nextsz * 2;
t->toclean = realloc(t->toclean, t->tocleansize);
}
t->toclean[t->tocleanind] = topush;
t->tocleanind++;
}
void freetoclean(struct Translator* t) {
for(int i = 0; i < t->tocleanind; i++)
free(t->toclean[i]);
free(t->toclean);
t->tocleansize = 0;
t->tocleanind = 0;
}
void freeasmlns(struct Translator* t) {
for(int i = 0; i < t->asmind; i++)
free(t->asmlns[i]);
free(t->asmlns);
t->asmsize = 0;
t->asmind = 0;
}
void freetranslator(struct Translator* t) {
freeasmlns(t);
freetoclean(t);
free(t);
}
void printasmlns(struct Translator* t, FILE* stream) {
for(int i = 0; i < t->asmind; i++)
fprintf(stream, "%s\n", t->asmlns[i]->instr);
}
char* heapstr(struct Translator* t, const char* input) {
char* newstr = (char*)malloc(sizeof(char)*(strlen(input)+1));
strcpy(newstr, input);
pushtoclean(t, newstr);
return newstr;
}
char* switchseg(struct Translator* t, struct line* ln) {
char* seg = ln->tokens[1];
if(!strcmp(seg, "local"))
return heapstr(t, "@LCL");
if(!strcmp(seg, "argument"))
return heapstr(t, "@ARG");
if(!strcmp(seg, "this"))
return heapstr(t, "@THIS");
if(!strcmp(seg, "that"))
return heapstr(t, "@THAT");
fprintf(stderr, "Unrecognized segment '%s'; line %i\n", seg, ln->truen);
exit(1);
}
int lnlen(int* out, struct line* ln) {
int len = 0;
for(int i = 0; i < ln->tokenscount; i++) {
int l = strlen(ln->tokens[i]);
out[i] = l;
len += l;
}
return len;
}
// produce comment as follows:
// pop/push segment i
char* mkcom(struct Translator* t, struct line* ln) {
int lens[ln->tokenscount];
int comlen = sizeof(char) * lnlen(lens, ln) + ln->tokenscount + 3;
char* comment = (char*)malloc(comlen);
comment[0] = '/';
comment[1] = '/';
char* tmp = comment + sizeof(char)*2;
for(int i = 0; i < ln->tokenscount; i++) {
tmp[0] = ' ';
tmp += sizeof(char);
strcpy(tmp, ln->tokens[i]);
tmp += sizeof(char)*lens[i];
}
tmp[0] = '\0';
pushtoclean(t, comment);
return comment;
}
void checkind(struct line* ln, int indlen) {
for(int i = 0; i < indlen; i++)
if(!isdigit(ln->tokens[2][i])) {
fprintf(stderr, "Invalid index '%s'; line %i\n", ln->tokens[2], ln->truen);
exit(1);
}
}
char* mkcmplab(struct Translator* t, struct line* ln) {
t->compcount++;
if(t->compcount > CMPLIMIT) {
fprintf(stderr, "Reached comparison limit (%i); line %i\n", CMPLIMIT, ln->truen);
exit(1);
}
int newsz = (t->fnamelen + CMPLEN + 6) * sizeof(char);
char* label = (char*)malloc(newsz);
snprintf(label, newsz, "%s-CMP-%i", t->fname, t->compcount);
pushtoclean(t, label);
return label;
}
char* mkind(struct Translator* t, struct line* ln, int indlen) {
checkind(ln, indlen);
int newsz = sizeof(char) * (indlen + 2);
char* newind = (char*)malloc(newsz);
snprintf(newind, newsz, "@%s", ln->tokens[2]);
pushtoclean(t, newind);
return newind;
}
char* atlab(struct Translator* t, char* label, int labellen) {
int newsz = sizeof(char) * (labellen + 2);
char* newind = (char*)malloc(newsz);
snprintf(newind, newsz, "@%s", label);
pushtoclean(t, newind);
return newind;
}
char* mklab(struct Translator* t, char* label, int labellen) {
int newsz = sizeof(char) * (labellen + 3);
char* newind = (char*)malloc(newsz);
snprintf(newind, newsz, "(%s)", label);
pushtoclean(t, newind);
return newind;
}
char* mkstatind(struct Translator* t, struct line* ln, int indlen) {
checkind(ln, indlen);
int newsz = sizeof(char) * (t->fnamelen + indlen + 3);
char* newind = (char*)malloc(newsz);
snprintf(newind, newsz, "@%s.%s", t->fname, ln->tokens[2]);
pushtoclean(t, newind);
return newind;
}
char* mktempind(struct Translator* t, struct line* ln, int indlen) {
checkind(ln, indlen);
int intind = atoi(ln->tokens[2]);
int newsz = sizeof(char) * (indlen + 3);
char* newind = (char*)malloc(newsz);
snprintf(newind, newsz, "@%i", intind+5);
pushtoclean(t, newind);
return newind;
}
char* mkpointerind(struct Translator* t, struct line* ln, int indlen) {
if(indlen > 1) {
fprintf(stderr, "Invalid index '%s'; line %i\n", ln->tokens[2], ln->truen);
exit(1);
}
char* ptr;
switch(ln->tokens[2][0]) {
case '0':
ptr = "THIS";
break;
case '1':
ptr = "THAT";
break;
default:
fprintf(stderr, "Invalid index '%s'; line %i\n", ln->tokens[2], ln->truen);
exit(1);
}
int newsz = sizeof(char) * 6;
char* newind = (char*)malloc(newsz);
snprintf(newind, newsz, "@%s", ptr);
pushtoclean(t, newind);
return newind;
}
void checkasmsize(struct Translator* t, int toadd) {
int targ = sizeof(struct asmln*)*(t->asmind+toadd);
if(targ >= t->asmsize) {
t->asmsize = targ * 2;
t->asmlns = (struct asmln**)realloc(t->asmlns, t->asmsize);
}
}
struct asmln* mkasmln(struct line* ln, char* content) {
struct asmln* newln = (struct asmln*)malloc(sizeof(struct asmln));
newln->truen = ln->truen;
newln->instr = content;
return newln;
}
void checkopamnt(int amnt, struct line* ln) {
if(ln->tokenscount < 2) {
fprintf(stderr, "Missing memory segment; line %i", ln->truen);
exit(1);
}
if(amnt > 2)
if(ln->tokenscount < 3) {
fprintf(stderr, "Missing operation index; line %i", ln->truen);
exit(1);
}
}
void addasmlns(struct Translator* t, struct line* ln, char** insts, int instcount) {
checkasmsize(t, instcount);
// instruction comment
insts[0] = mkcom(t, ln);
for(int i = 0; i < instcount; i++) {
t->asmlns[t->asmind] = mkasmln(ln, insts[i]);
t->asmind++;
}
}
void startpoppush(struct Translator* t, struct line* ln, int indlen, char** insts) {
// @segment
insts[1] = switchseg(t, ln);
// D=M
insts[2] = heapstr(t, "D=M");
// @i
insts[3] = mkind(t, ln, indlen);
}
void pushcons(struct Translator* t, struct line* ln, int indlen) {
// @i
tpushcons[1] = mkind(t, ln, indlen);
addasmlns(t, ln, tpushcons, TPUSHCONSN);
}
void pushstat(struct Translator* t, struct line* ln, int indlen) {
// @fname.i
tpushstat[1] = mkstatind(t, ln, indlen);
addasmlns(t, ln, tpushstat, TPUSHSTATN);
}
void pushtemp(struct Translator* t, struct line* ln, int indlen) {
// @5+i
tpushtemp[1] = mktempind(t, ln, indlen);
addasmlns(t, ln, tpushtemp, TPUSHTEMPN);
}
void pushpointer(struct Translator* t, struct line* ln, int indlen) {
// @THIS/@THAT
tpushpointer[1] = mkpointerind(t, ln, indlen);
addasmlns(t, ln, tpushpointer, TPUSHPOINTERN);
}
void push(struct Translator* t, struct line* ln, int indlen) {
startpoppush(t, ln, indlen, tpush);
addasmlns(t, ln, tpush, TPUSHN);
}
void popstat(struct Translator* t, struct line* ln, int indlen) {
// @fname.i
tpopstat[TPOPSTATN-2] = mkstatind(t, ln, indlen);
// M=D
tpopstat[TPOPSTATN-1] = heapstr(t, "M=D");
addasmlns(t, ln, tpopstat, TPOPSTATN);
}
void poptemp(struct Translator* t, struct line* ln, int indlen) {
// @5+i
tpoptemp[TPOPTEMPN-2] = mktempind(t, ln, indlen);
// M=D
tpoptemp[TPOPTEMPN-1] = heapstr(t, "M=D");
addasmlns(t, ln, tpoptemp, TPOPTEMPN);
}
void poppointer(struct Translator* t, struct line* ln, int indlen) {
// @THIS/@THAT
tpoppointer[TPOPPOINTERN-2] = mkpointerind(t, ln, indlen);
// M=D
tpoppointer[TPOPPOINTERN-1] = heapstr(t, "M=D");
addasmlns(t, ln, tpoppointer, TPOPPOINTERN);
}
void pop(struct Translator* t, struct line* ln, int indlen) {
startpoppush(t, ln, indlen, tpop);
addasmlns(t, ln, tpop, TPOPN);
}
void arith(struct Translator* t, struct line* ln, char* op) {
tarith[TARITHN-1] = heapstr(t, op);
addasmlns(t, ln, tarith, TARITHN);
}
void comp(struct Translator* t, struct line* ln, char* op) {
char* label = mkcmplab(t, ln);
int labellen = strlen(label);
// @label
tcomp[TCOMPN-6] = atlab(t, label, labellen);
// D;J(op)
int opsz = sizeof(char)*6;
char* trueop = (char*)malloc(opsz);
snprintf(trueop, opsz, "D;J%s", op);
tcomp[TCOMPN-5] = trueop;
pushtoclean(t, trueop);
// (label)
tcomp[TCOMPN-1] = mklab(t, label, labellen);
addasmlns(t, ln, tcomp, TCOMPN);
};
void label(struct Translator* t, struct line* ln) {
if(ln->tokenscount < 2) {
fprintf(stderr, "Expected label; line %i", ln->truen);
exit(1);
}
// (label)
tlabel[TLABELN-1] = mklab(t, ln->tokens[1], strlen(ln->tokens[1]));
addasmlns(t, ln, tlabel, TLABELN);
}
void mygoto(struct Translator* t, struct line* ln) {
if(ln->tokenscount < 2) {
fprintf(stderr, "Expected label; line %i", ln->truen);
exit(1);
}
// @label
tgoto[TGOTON-2] = atlab(t, ln->tokens[1], strlen(ln->tokens[1]));
addasmlns(t, ln, tgoto, TGOTON);
}
void ifgoto(struct Translator* t, struct line* ln) {
if(ln->tokenscount < 2) {
fprintf(stderr, "Expected label; line %i", ln->truen);
exit(1);
}
// @label
tifgoto[TIFGOTON-2] = atlab(t, ln->tokens[1], strlen(ln->tokens[1]));
addasmlns(t, ln, tifgoto, TIFGOTON);
}
void switchpush(struct Translator* t, struct line* ln) {
checkopamnt(3, ln);
char* seg = ln->tokens[1];
int indlen = strlen(ln->tokens[2]);
if(!strcmp(seg, "constant"))
pushcons(t, ln, indlen);
else if(!strcmp(seg, "static"))
pushstat(t, ln, indlen);
else if(!strcmp(seg, "temp"))
pushtemp(t, ln, indlen);
else if(!strcmp(seg, "pointer"))
pushpointer(t, ln, indlen);
else
push(t, ln, indlen);
}
void switchpop(struct Translator* t, struct line* ln) {
checkopamnt(3, ln);
char* seg = ln->tokens[1];
int indlen = strlen(ln->tokens[2]);
if(!strcmp(seg, "static"))
popstat(t, ln, indlen);
else if(!strcmp(seg, "temp"))
poptemp(t, ln, indlen);
else if(!strcmp(seg, "pointer"))
poppointer(t, ln, indlen);
else
pop(t, ln, indlen);
}
void switchop(struct Translator* t, struct line* ln) {
char* op = ln->tokens[0];
if(!strcmp(op, "push"))
switchpush(t, ln);
else if(!strcmp(op, "pop"))
switchpop(t, ln);
else if(!strcmp(op, "add"))
arith(t, ln, "M=D+M");
else if(!strcmp(op, "sub"))
arith(t, ln, "M=M-D");
else if(!strcmp(op, "neg"))
addasmlns(t, ln, tneg, TNEGN);
else if(!strcmp(op, "eq"))
comp(t, ln, "EQ");
else if(!strcmp(op, "gt"))
comp(t, ln, "LT");
else if(!strcmp(op, "lt"))
comp(t, ln, "GT");
else if(!strcmp(op, "and"))
arith(t, ln, "M=D&M");
else if(!strcmp(op, "or"))
arith(t, ln, "M=D|M");
else if(!strcmp(op, "not"))
addasmlns(t, ln, tnot, TNOTN);
else if(!strcmp(op, "label"))
label(t, ln);
else if(!strcmp(op, "goto"))
mygoto(t, ln);
else if(!strcmp(op, "if-goto"))
ifgoto(t, ln);
else {
fprintf(stderr, "Unrecognized operation '%s'; line %i\n", op, ln->truen);
exit(1);
}
}
void translate(struct Translator* t) {
for(int i = 0; i < t->lns->count; i++)
switchop(t, t->lns->lns[i]);
}
struct Translator* mktranslator(struct lnarray* lns, char* fname) {
struct Translator* t = (struct Translator*)malloc(sizeof(struct Translator));
t->asmsize = sizeof(struct asmln*)*(lns->count * 15);
t->asmind = 0;
t->compcount = 0;
t->asmlns = (struct asmln**)malloc(t->asmsize);
t->tocleanind = 0;
t->tocleansize = sizeof(char*)*(lns->count * 5);
t->toclean = (char**)malloc(t->tocleansize);
t->lns = lns;
t->fname = fname;
t->fnamelen = strlen(fname);
return t;
}