191 lines
4.2 KiB
C
191 lines
4.2 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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enum operation { push, pop };
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enum operation getop(struct line* ln) {
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char* tok = ln->tokens[0];
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if(strcmp(tok, "push") == 0)
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return push;
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if(strcmp(tok, "pop") == 0)
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return pop;
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fprintf(stderr, "Invalid operation '%s'; line %i", tok, ln->truen);
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exit(1);
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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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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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}
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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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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(char* ind, 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", ind);
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return newind;
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}
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void checkasmsize(int* size, struct asmln** lns, int targ) {
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if(targ >= (*size)) {
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printf("realloc'd");
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(*size)=targ*2;
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(*lns) = realloc((*lns), (*size));
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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 startpoppush(struct line* ln, struct asmln** asmlns, int* asmind) {
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int asmi = *asmind;
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// //operation segment i
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int indlen = strlen(ln->tokens[2]);
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asmlns[asmi] = mkasmln(ln, mkcom(ln, indlen));
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asmi++;
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// @segment
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asmlns[asmi] = mkasmln(ln, switchseg(ln));
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asmi++;
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// D=M
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asmlns[asmi] = mkasmln(ln, heapstr("D=M"));
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asmi++;
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// @i
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checkind(ln, indlen);
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asmlns[asmi] = mkasmln(ln, mkind(ln->tokens[2], indlen));
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asmi++;
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(*asmind) = asmi;
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}
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void mkpush(struct line* ln, struct asmln** asmlns, int* asmind, int* asmsize) {
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int asmi = *asmind;
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int totalinstrs = 11;
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checkasmsize(asmsize, asmlns, sizeof(struct asmln*)*(asmi+totalinstrs));
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startpoppush(ln, asmlns, &asmi);
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const int instcount = 7;
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const char* instrs[] = {
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"A=D+A",
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"D=M",
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"@SP",
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"A=M",
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"M=D",
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"@SP",
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"M=M+1"
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};
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for(int i = 0; i < instcount; i++) {
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asmlns[asmi] = mkasmln(ln, heapstr(instrs[i]));
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asmi++;
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}
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(*asmind) = asmi;
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}
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void mkpop(struct line* ln, struct asmln** asmlns, int* asmind, int* asmsize) {
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int asmi = *asmind;
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int finalasmi = 14;
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checkasmsize(asmsize, asmlns, sizeof(struct asmln*)*(asmi+finalasmi));
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startpoppush(ln, asmlns, &asmi);
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const int instcount = 10;
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const char* instrs[] = {
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"D=D+A",
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"@R13",
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"M=D",
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"@SP",
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"M=M-1",
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"A=M",
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"D=M",
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"@R13",
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"A=M",
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"M=D"
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};
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for(int i = 0; i < instcount; i++) {
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asmlns[asmi] = mkasmln(ln, heapstr(instrs[i]));
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asmi++;
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}
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(*asmind) = asmi;
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}
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void mkpoppush(struct line* ln, struct asmln** asmlns, int* asmind, int* asmsize, enum operation op) {
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if(op == push)
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mkpush(ln, asmlns, asmind, asmsize);
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else if(op == pop)
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mkpop(ln, asmlns, asmind, asmsize);
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}
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void checkopamnt(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(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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struct asmln** translate(struct line** lns, int lnscount, int* asmind) {
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int sizebet = sizeof(struct asmln*)*(lnscount * 15);
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int asmi = (*asmind);
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struct asmln** asmlns = (struct asmln**)malloc(sizebet);
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for(int i = 0; i < lnscount; i++) {
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struct line* ln = lns[i];
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enum operation op = getop(ln);
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if(op == pop || op == push) {
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checkopamnt(ln);
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mkpoppush(ln, asmlns, &asmi, &sizebet, op);
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}
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}
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(*asmind) = asmi;
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return asmlns;
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}
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