302 lines
6.3 KiB
C
302 lines
6.3 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "translator.h"
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#include "templates.h"
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struct asmln** asmlns;
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int asmind;
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int asmsize;
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char** toclean;
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int tocleansize;
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int tocleanind;
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void pushtoclean(char* topush) {
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int nextsz = sizeof(char*)*(tocleanind+1);
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if(nextsz >= tocleansize) {
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tocleansize = nextsz * 2;
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toclean = realloc(toclean, tocleansize);
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}
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toclean[tocleanind] = topush;
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tocleanind++;
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}
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void freetoclean() {
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for(int i = 0; i < tocleanind; i++) {
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free(toclean[i]);
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}
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free(toclean);
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tocleansize = 0;
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tocleanind = 0;
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}
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void freeasmlns() {
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for(int i = 0; i < asmind; i++) {
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free(asmlns[i]);
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}
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free(asmlns);
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asmsize = 0;
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asmind = 0;
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freetoclean();
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}
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void printasmlns() {
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for(int i = 0; i < asmind; i++) {
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printf("%s\n", asmlns[i]->instr);
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}
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}
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char* heapstr(const char* input) {
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char* newstr = (char*)malloc(sizeof(char)*(strlen(input)+1));
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strcpy(newstr, input);
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pushtoclean(newstr);
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return newstr;
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}
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char* switchseg(struct line* ln) {
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char* seg = ln->tokens[1];
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if(strcmp(seg, "local") == 0)
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return heapstr("@LCL");
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if(strcmp(seg, "argument") == 0)
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return heapstr("@ARG");
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if(strcmp(seg, "this") == 0)
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return heapstr("@THIS");
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if(strcmp(seg, "that") == 0)
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return heapstr("@THAT");
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fprintf(stderr, "Unrecognized segment '%s'; line %i\n", seg, ln->truen);
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exit(1);
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}
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// produce comment as follows:
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// pop/push segment i
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char* mkcom(struct line* ln, int indlen) {
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int comlen = sizeof(char) * (strlen(ln->tokens[0]) + strlen(ln->tokens[1]) + indlen + 6);
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char* comment = (char*)malloc(comlen);
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snprintf(comment, comlen, "// %s %s %s", ln->tokens[0], ln->tokens[1], ln->tokens[2]);
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pushtoclean(comment);
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return comment;
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}
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void checkind(struct line* ln, int indsz) {
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for(int i = 0; i < indsz; i++) {
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if(!isdigit(ln->tokens[2][i])) {
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fprintf(stderr, "Invalid index '%s'; line %i\n", ln->tokens[2], ln->truen);
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exit(1);
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}
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}
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}
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char* mkind(struct line* ln, int indsz) {
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int newsz = sizeof(char) * (indsz + 2);
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char* newind = (char*)malloc(newsz);
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snprintf(newind, newsz, "@%s", ln->tokens[2]);
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pushtoclean(newind);
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return newind;
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}
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char* mkstatind(struct line* ln, int indsz, char* fname) {
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int fnamelen = strlen(fname);
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int newsz = sizeof(char) * (fnamelen + indsz + 3);
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char* newind = (char*)malloc(newsz);
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snprintf(newind, newsz, "@%s.%s", fname, ln->tokens[2]);
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pushtoclean(newind);
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return newind;
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}
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char* mktempind(struct line* ln, int indsz) {
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int intind = atoi(ln->tokens[2]);
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int newsz = sizeof(char) * (indsz + 3);
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char* newind = (char*)malloc(newsz);
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snprintf(newind, newsz, "@%i", intind+5);
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pushtoclean(newind);
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return newind;
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}
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void checkasmsize(int toadd) {
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int targ = sizeof(struct asmln*)*(asmind+toadd);
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if(targ >= asmsize) {
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asmsize = targ * 2;
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asmlns = (struct asmln**)realloc(asmlns, asmsize);
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}
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}
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struct asmln* mkasmln(struct line* ln, char* content) {
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struct asmln* newln = (struct asmln*)malloc(sizeof(struct asmln));
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newln->truen = ln->truen;
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newln->instr = content;
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return newln;
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}
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void checkopamnt(int amnt, struct line* ln) {
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if(ln->tokenscount < 2) {
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fprintf(stderr, "Missing memory segment; line %i", ln->truen);
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exit(1);
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}
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if(amnt > 2)
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if(ln->tokenscount < 3) {
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fprintf(stderr, "Missing operation index; line %i", ln->truen);
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exit(1);
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}
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}
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void addasmlns(struct line* ln, char** insts, int instcount) {
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for(int i = 0; i < instcount; i++) {
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asmlns[asmind] = mkasmln(ln, insts[i]);
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asmind++;
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}
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}
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void startpoppush(struct line* ln, int indlen, char** insts) {
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// // operation segment i
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insts[0] = mkcom(ln, indlen);
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// @segment
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insts[1] = switchseg(ln);
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// D=M
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insts[2] = heapstr("D=M");
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// @i
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checkind(ln, indlen);
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insts[3] = mkind(ln, indlen);
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}
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void pushcons(struct line* ln, int indlen) {
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checkasmsize(TPUSHCONSN);
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// // push constant i
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tpushcons[0] = mkcom(ln, indlen);
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// @i
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checkind(ln, indlen);
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tpushcons[1] = mkind(ln, indlen);
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addasmlns(ln, tpushcons, TPUSHCONSN);
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}
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void pushstat(struct line* ln, int indlen, char* fname) {
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checkasmsize(TPUSHSTATN);
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// // push static i
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tpushstat[0] = mkcom(ln, indlen);
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// @fname.i
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checkind(ln, indlen);
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tpushstat[1] = mkstatind(ln, indlen, fname);
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addasmlns(ln, tpushstat, TPUSHSTATN);
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}
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void pushtemp(struct line* ln, int indlen) {
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checkasmsize(TPUSHSTATN);
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// // pop static i
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tpushtemp[0] = mkcom(ln, indlen);
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// @5+i
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checkind(ln, indlen);
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tpushtemp[1] = mktempind(ln, indlen);
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addasmlns(ln, tpushtemp, TPUSHTEMP);
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}
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void mkpush(struct line* ln, int indlen) {
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checkasmsize(TPUSHN);
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startpoppush(ln, indlen, tpush);
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addasmlns(ln, tpush, TPUSHN);
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}
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void popstat(struct line* ln, int indlen, char* fname) {
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checkasmsize(TPOPSTATN);
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// // pop static i
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tpopstat[0] = mkcom(ln, indlen);
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// @fname.i
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checkind(ln, indlen);
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tpopstat[6] = mkstatind(ln, indlen, fname);
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// M=D
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tpopstat[7] = heapstr("M=D");
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addasmlns(ln, tpopstat, TPOPSTATN);
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}
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void poptemp(struct line* ln, int indlen) {
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checkasmsize(TPOPTEMPN);
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// // pop static i
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tpoptemp[0] = mkcom(ln, indlen);
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// @5+i
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checkind(ln, indlen);
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tpoptemp[5] = mktempind(ln, indlen);
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// M=D
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tpoptemp[6] = heapstr("M=D");
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addasmlns(ln, tpoptemp, TPOPTEMPN);
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}
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void mkpop(struct line* ln, int indlen) {
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checkasmsize(TPOPN);
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startpoppush(ln, indlen, tpop);
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addasmlns(ln, tpop, TPOPN);
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}
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void switchop(struct line* ln, char* fname) {
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char* op = ln->tokens[0];
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if(strcmp(op, "push") == 0) {
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checkopamnt(3, ln);
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char* seg = ln->tokens[1];
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int indlen = strlen(ln->tokens[2]);
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if(strcmp(seg, "constant") == 0)
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pushcons(ln, indlen);
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else if(strcmp(seg, "static") == 0)
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pushstat(ln, indlen, fname);
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else if(strcmp(seg, "temp") == 0)
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pushtemp(ln, indlen);
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else
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mkpush(ln, indlen);
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}
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else if(strcmp(op, "pop") == 0) {
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checkopamnt(3, ln);
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char* seg = ln->tokens[1];
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int indlen = strlen(ln->tokens[2]);
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if(strcmp(seg, "static") == 0)
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popstat(ln, indlen, fname);
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else if(strcmp(seg, "temp") == 0)
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poptemp(ln, indlen);
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else
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mkpop(ln, indlen);
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}
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}
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void translate(struct line** lns, int lnscount, char* fname) {
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asmsize = sizeof(struct asmln*)*(lnscount * 15);
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asmind = 0;
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asmlns = (struct asmln**)malloc(asmsize);
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tocleanind = 0;
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tocleansize = sizeof(char*)*(lnscount * 5);
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toclean = (char**)malloc(tocleansize);
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for(int i = 0; i < lnscount; i++) {
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struct line* ln = lns[i];
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switchop(ln, fname);
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}
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}
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