Add functions

Makefile

@@ -1,4 +1,4 @@
-FILES = parser.c main.c translator.c
+FILES = parser.c main.c translator.c util.c
 INCLUDES = -I.
 CFLAGS = -std=c99 -g
 OUTFILE = vmtranslator

bootstrap.h

@@ -0,0 +1,55 @@
+#define BOOTSTRAPN 52
+const char* bootstrapcode[BOOTSTRAPN] = {
+	"@256",
+	"D=A",
+	"@SP",
+	"M=D",
+	"@BOOTSTRAP$ret",
+	"D=A",
+	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
+	"M=M+1",
+	"@LCL",
+	"D=M",
+	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
+	"M=M+1",
+	"@ARG",
+	"D=M",
+	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
+	"M=M+1",
+	"@THIS",
+	"D=M",
+	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
+	"M=M+1",
+	"@THAT",
+	"D=M",
+	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
+	"M=M+1",
+	"@5",
+	"D=A",
+	"@SP",
+	"D=M-D",
+	"@ARG",
+	"M=D",
+	"@SP",
+	"D=M",
+	"@LCL",
+	"M=D",
+	"@Sys.init",
+	"0;JMP",
+	"(BOOTSTRAP$ret)"
+};

main.c

@@ -2,79 +2,237 @@
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
+#include <sys/types.h>
+#include <dirent.h>
 #include "parser.h"
 #include "translator.h"
+#include "bootstrap.h"
+#include "util.h"
 
-char* verfname(char* fname) {
+struct TranslationList {
-	int len = strlen(fname);
+	char** files;
-	if(len > 3) {
+	char** fnames;
-		int extind = len - 3;
+	int filecount;
-		char* extstr = fname + (sizeof(char)*extind);
+	int filessz;
-		if(strcmp(extstr, ".vm") == 0) {
+	char* output;
-			int startind = 0;
+};
-			for(int i = extind-1; i >= 0; i--) {
+
-				if(fname[i] == '/') {
+char* getname(char* f, int len) {
-					startind = i+1;
+	int startind = 0;
-					break;
+	int endind = len - 1;
-				}
+	short readsmt = 0;
+ 
+	for(int i = endind; i >= 0; i--) {
+		if(f[i] == '/') {
+			if(!readsmt) {
+				endind = i-1;
+				f[i] = '\0';
+				continue;
 			}
-			int size = sizeof(char)*(extind - startind + 1);
+			startind = i+1;
-			char* startstr = fname + (sizeof(char)*startind);
+			break;
-			char* retstr = (char*)malloc(size);
-			snprintf(retstr, size, "%s", startstr);
-			return retstr;
 		}
+		if(f[i] == '.')
+			endind = i-1;
+		readsmt = 1;
 	}
-	fprintf(stderr, "Name format must be Xxx.vm\n");
+
-	exit(1);
+	int size = sizeof(char)*(endind - startind + 2);
+	char* startstr = f + (sizeof(char)*startind);
+	char* retstr = (char*)malloc(size);
+	snprintf(retstr, size, "%s", startstr);
+	return retstr;
 }
 
-char* getoutname(char* fname) {
+char* getfullname(char* f, int len) {
-	int len = strlen(fname);
+	int endind = len - 1;
-	int sz = sizeof(char)*(len+2);
+	short readsmt = 0;
-	char* outname = (char*)malloc(sz);
+ 
-	strcpy(outname, fname);
+	for(int i = endind; i >= 0; i--) {
-	int ind = len-2;
+		if(f[i] == '/') {
-	char* ext = sizeof(char)*ind+outname;
+			if(!readsmt) {
-	snprintf(ext, 4, "asm");
+				endind = i-1;
+				continue;
+			}
+			break;
+		}
+		if(f[i] == '.')
+			endind = i-1;
+		readsmt = 1;
+	}
+
+	int size = sizeof(char)*(endind + 2);
+	char* retstr = (char*)malloc(size);
+	snprintf(retstr, size, "%s", f);
+	return retstr;
+}
+
+short isdotvm(char* f, int extind) {
+	char* extstr = f + (sizeof(char) * extind);
+	return strcmp(extstr, ".vm") == 0;
+}
+
+short isdir(char* f, int len) {
+	short readsmt = 0;
+	for(int i = len-1; i >= 0; i--) {
+		if(f[i] == '.')
+			if(readsmt)
+				return 0;
+			else
+				continue;
+		if(f[i] == '/')
+			return 1;
+		readsmt = 1;
+	}
+	return 1;
+}
+
+char* getoutname(char* input, int len, short isdir) {
+	char* outname;
+	if(isdir) {
+		char* name = getname(input, len);
+		int sz = sizeof(char) * (strlen(name)+len+6);
+		outname = (char*)malloc(sz);
+		snprintf(outname, sz, "%s/%s.asm", input, name);
+		free(name);
+	}
+	else {
+		char* name = getfullname(input, len);
+		int sz = sizeof(char) * (strlen(name)+5);
+		outname = (char*)malloc(sz);
+		snprintf(outname, sz, "%s.asm", name);
+		free(name);
+	}
 	return outname;
 }
 
+void addfile(struct TranslationList* l, char* fullname, char* name) {
+	int count = l->filecount;
+	int targsize = (count + 1) * sizeof(char*);
+
+	if(l->filessz < targsize) {
+		int newsz = targsize * 2;
+		l->files = realloc(l->files, newsz);
+		l->fnames = realloc(l->fnames, newsz);
+		l->filessz = newsz;
+	}
+
+	l->files[count] = fullname;
+	l->fnames[count] = name;
+	l->filecount++;
+}
+
+struct TranslationList* getfiles(char* input) {
+	int filessz = sizeof(char*) * 16;
+	struct TranslationList* filelist = (struct TranslationList*)malloc(sizeof(struct TranslationList));
+	filelist->files = (char**)malloc(filessz);
+	filelist->fnames = (char**)malloc(filessz);
+	filelist->filessz = filessz;
+	filelist->filecount = 0;
+
+	int inplen = strlen(input);
+	short isitdir = isdir(input, inplen);
+	if(isitdir) {
+		DIR* dir = opendir(input);
+
+		if(dir == NULL) {
+			fprintf(stderr, "%s\n", strerror(errno));
+			exit(1);
+		}
+
+		struct dirent* thisfile;
+		while(thisfile = readdir(dir), thisfile != NULL) {
+			int len = strlen(thisfile->d_name);
+			if(len > 3) {
+				int extind = len - 3;
+				if(isdotvm(thisfile->d_name, extind)) {
+					int sz = sizeof(char)*(len+inplen+2);
+					char* str = (char*)malloc(sz);
+					snprintf(str, sz, "%s/%s", input, thisfile->d_name);
+					char* name = getname(thisfile->d_name, len);
+					addfile(filelist, str, name);
+				}
+			}
+		}
+		
+		closedir(dir);
+
+		if(filelist->filecount <= 0) {
+			fprintf(stderr, "Directory doesn't have any .vm file\n");
+			exit(1);
+		}
+
+		filelist->output = getoutname(input, inplen, isitdir);
+	}
+	else {
+		int extind = inplen - 3;
+		if(isdotvm(input, extind)){
+			char* name = getname(input, inplen);
+			char* f = heapstr(input, inplen);
+			addfile(filelist, f, name);
+		}
+		else {
+			fprintf(stderr, "Input file must be named like 'Xxx.vm'\n");
+			exit(1);
+		}
+		
+		filelist->output = getoutname(input, inplen, isitdir);
+	}
+	
+	return filelist;
+}
+
+void freetranslationlist(struct TranslationList* ls) {
+	for(int i = 0; i < ls->filecount; i++) {
+		free(ls->files[i]);
+		free(ls->fnames[i]);
+	}
+	free(ls->files);
+	free(ls->fnames);
+	free(ls->output);
+	free(ls);
+}
+
 int main(int argc, char* argv[]) {
 	if(argc < 2) {
 		fprintf(stderr, "Usage: %s {file}\n", argv[0]);
 		return 1;
 	}
-	// file name validating
-	char* fname = verfname(argv[1]);
-	
-	FILE* input = fopen(argv[1], "r");
 
-	if(input == NULL) {
+	struct TranslationList* ls = getfiles(argv[1]);
-		fprintf(stderr, "%s\n", strerror(errno));
+	FILE* output = fopen(ls->output, "w");
-		return errno;
+
+	for(int i = 0; i < BOOTSTRAPN; i++) {
+		fprintf(output, "%s\n", bootstrapcode[i]);
 	}
 
-	// parsing
+	for(int i = 0; i < ls->filecount; i++) {
-	struct Parser* p = mkparser(input);
+		// file name validating
-	parse(p);
+		char* fname = ls->fnames[i];
+		
+		FILE* input = fopen(ls->files[i], "r");
 
-	// translating
+		if(input == NULL) {
-	struct Translator* t = mktranslator(p->lns, fname);
+			fprintf(stderr, "%s\n", strerror(errno));
-	translate(t);
+			return errno;
-	freeparser(p);
+		}
-	free(fname);
+
-	
+		// parsing
-	// output
+		struct Parser* p = mkparser(input);
-	char* outname = getoutname(argv[1]);
+		parse(p);
-	
+
-	FILE* output = fopen(outname, "w");
+		// translating
-	printasmlns(t, output);
+		struct Translator* t = mktranslator(p->lns, fname);
+		translate(t);
+		freeparser(p);
+		
+		printasmlns(t, output);
+
+		// freeing rest
+		freetranslator(t);
+	}
+
+	freetranslationlist(ls);
 	fclose(output);
-
-	// freeing rest
-	free(outname);
-	freetranslator(t);
-
 	return 0;
 }

templates.h

@@ -1,7 +1,7 @@
 #ifndef templates
 #define templates
 
-#define TPUSHN 10
+#define TPUSHN 11
 char* tpush[TPUSHN] = {
 	"",
 	"",
@@ -10,31 +10,34 @@ char* tpush[TPUSHN] = {
 	"A=D+A",
 	"D=M",
 	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
 	"M=M+1",
-	"A=M-1",
-	"M=D"
 };
 
-#define TPUSHCONSN 7
+#define TPUSHCONSN 8
 char* tpushcons[TPUSHCONSN] = {
 	"",
 	"",
 	"D=A",
 	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
 	"M=M+1",
-	"A=M-1",
-	"M=D"
 };
 
-#define TPUSHSTATN 7
+#define TPUSHSTATN 8
 char* tpushstat[TPUSHSTATN] = {
 	"",
 	"",
 	"D=M",
 	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
 	"M=M+1",
-	"A=M-1",
-	"M=D"
 };
 
 #define TPUSHTEMPN TPUSHSTATN
@@ -43,7 +46,7 @@ char** tpushtemp = tpushstat;
 #define TPUSHPOINTERN TPUSHSTATN
 char** tpushpointer = tpushstat;
 
-#define TPOPN 14
+#define TPOPN 13
 char* tpop[TPOPN] = {
 	"",
 	"",
@@ -53,20 +56,18 @@ char* tpop[TPOPN] = {
 	"@R13",
 	"M=D",
 	"@SP",
-	"M=M-1",
+	"AM=M-1",
-	"A=M",
 	"D=M",
 	"@R13",
 	"A=M",
 	"M=D"
 };
 
-#define TPOPSTATN 7
+#define TPOPSTATN 6
 char* tpopstat[TPOPSTATN] = {
 	"",
 	"@SP",
-	"M=M-1",
+	"AM=M-1",
-	"A=M",
 	"D=M",
 	"",
 	""
@@ -78,12 +79,11 @@ char** tpoptemp = tpopstat;
 #define TPOPPOINTERN TPOPSTATN
 char** tpoppointer = tpopstat;
 
-#define TARITHN 7
+#define TARITHN 6
 char* tarith[TARITHN] = {
 	"",
 	"@SP",
-	"M=M-1",
+	"AM=M-1",
-	"A=M",
 	"D=M",
 	"A=A-1",
 	""
@@ -105,12 +105,11 @@ char* tnot[TNOTN] = {
 	"M=!M",
 };
 
-#define TCOMPN 14
+#define TCOMPN 13
 char* tcomp[TCOMPN] = {
 	"",
 	"@SP",
-	"M=M-1",
+	"AM=M-1",
-	"A=M",
 	"D=M",
 	"A=A-1",
 	"D=D-M",
@@ -136,15 +135,117 @@ char* tgoto[TGOTON] = {
 	"0;JMP"
 };
 
-#define TIFGOTON 7
+#define TIFGOTON 6
 char* tifgoto[TIFGOTON] = {
 	"",
 	"@SP",
-	"M=M-1",
+	"AM=M-1",
-	"A=M",
 	"D=M",
 	"",
 	"D;JNE"
 };
 
+#define TCALLSTARTN 8
+char* tcallstart[TCALLSTARTN] = {
+	"",
+	"",
+	"D=A",
+	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
+	"M=M+1",
+};
+
+#define TCALLPUSHN 7
+char* tcallpush[TCALLPUSHN] = {
+	"",
+	"D=M",
+	"@SP",
+	"A=M",
+	"M=D",
+	"@SP",
+	"M=M+1",
+};
+
+#define TCALLSETARGN 8
+char* tcallsetarg[TCALLSETARGN] = {
+	"@SP",
+	"D=M",
+	"@LCL",
+	"M=D",
+	"",
+	"D=D-A",
+	"@ARG",
+	"M=D"
+};
+
+#define TCALLJMPN 3
+char* tcalljmp[TCALLJMPN] = {
+	"",
+	"0;JMP",
+	""
+};
+	
+#define TFRAMEVARSN 4
+char* tframevars[TFRAMEVARSN] = {
+	"@LCL",
+	"@ARG",
+	"@THIS",
+	"@THAT"
+};
+
+#define TFUNCTIONN 2
+char* tfunction[TFUNCTIONN] = {
+	"",
+	""
+};
+
+#define TFUNCTIONPUSHN 5
+char* tfunctionpush[TFUNCTIONPUSHN] = {
+	"@SP",
+	"A=M",
+	"M=0",
+	"@SP",
+	"M=M+1"
+};
+
+#define TSTARTRETURNN 18
+char* tstartreturn[TSTARTRETURNN] = {
+	"",
+	"@LCL",
+	"D=M",
+	"@5",
+	"A=D-A",
+	"D=M",
+	"@R13",
+	"M=D",
+	"@SP",
+	"A=M-1",
+	"D=M",
+	"@ARG",
+	"A=M",
+	"M=D",
+	"@ARG",
+	"D=M+1",
+	"@SP",
+	"M=D"
+};
+
+#define TRETPOPN 5
+char* tretpop[TRETPOPN] = {
+	"@LCL",
+	"AM=M-1",
+	"D=M",
+	"",
+	"M=D",
+};
+
+#define TENDRETURNN 3
+char* tendreturn[TENDRETURNN] = {
+	"@R13",
+	"A=M",
+	"0;JMP"
+};
+
 #endif

translator.c

@@ -4,8 +4,7 @@
 #include <ctype.h>
 #include "translator.h"
 #include "templates.h"
-#define CMPLIMIT 9999
+#include "util.h"
-#define CMPLEN 4
 
 void pushtoclean(struct Translator* t, char* topush) {
 	int nextsz = sizeof(char*)*(t->tocleanind+1);
@@ -21,32 +20,21 @@ 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);
+	free(t->asmlns);
 	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);
+		fprintf(stream, "%s\n", t->asmlns[i]);
 }
 
-char* heapstr(struct Translator* t, const char* input) {
+char* heapstrtoclean(struct Translator* t, const char* input) {
-	char* newstr = (char*)malloc(sizeof(char)*(strlen(input)+1));
+	char* newstr = heapstr(input, strlen(input));
-	strcpy(newstr, input);
 	pushtoclean(t, newstr);
 	return newstr;
 }
@@ -54,14 +42,14 @@ char* heapstr(struct Translator* t, const char* input) {
 char* switchseg(struct Translator* t, struct line* ln) {
 	char* seg = ln->tokens[1];
 	if(!strcmp(seg, "local"))
-		return heapstr(t, "@LCL");
+		return heapstrtoclean(t, "@LCL");
 	if(!strcmp(seg, "argument"))
-		return heapstr(t, "@ARG");
+		return heapstrtoclean(t, "@ARG");
 	if(!strcmp(seg, "this"))
-		return heapstr(t, "@THIS");
+		return heapstrtoclean(t, "@THIS");
 	if(!strcmp(seg, "that"))
-		return heapstr(t, "@THAT");
+		return heapstrtoclean(t, "@THAT");
-	fprintf(stderr, "Unrecognized segment '%s'; line %i\n", seg, ln->truen);
+	fprintf(stderr, "Unrecognized segment '%s'; file %s.vm, line %i\n", t->fname, seg, ln->truen);
 	exit(1);
 }
 
@@ -99,29 +87,67 @@ char* mkcom(struct Translator* t, struct line* ln) {
 	return comment;
 }
 
-void checkind(struct line* ln, int indlen) {
+void checknumber(struct Translator* t, struct line* ln, int indlen, char* name, char* n) {
 	for(int i = 0; i < indlen; i++)
-		if(!isdigit(ln->tokens[2][i])) {
+		if(!isdigit(n[i])) {
-			fprintf(stderr, "Invalid index '%s'; line %i\n", ln->tokens[2], ln->truen);
+			fprintf(stderr, "Invalid %s '%s'; file %s.vm, line %i\n", t->fname, name, n, ln->truen);
 			exit(1);
 		}
 }
 
-char* mkcmplab(struct Translator* t, struct line* ln) {
+void checknargs(struct Translator* t, struct line* ln, int nargslen) {
-	t->compcount++;
+	checknumber(t, ln, nargslen, "argument number", ln->tokens[2]);
-	if(t->compcount > CMPLIMIT) {
+}
-		fprintf(stderr, "Reached comparison limit (%i); line %i\n", CMPLIMIT, ln->truen);
+
+void checknlocals(struct Translator* t, struct line* ln, int nlocalslen) {
+	checknumber(t, ln, nlocalslen, "local variable number", ln->tokens[2]);
+}
+
+void checkind(struct Translator* t, struct line* ln, int indlen) {
+	checknumber(t, ln, indlen, "index", ln->tokens[2]);
+}
+
+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;
+}
+
+void checkinfun(struct Translator* t, struct line* ln) {
+	if(t->funcount <= 0) {
+		fprintf(stderr, "Instruction should be part of a function; file %s.vm, line %i\n", t->fname, 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);
+char* mkspeciallab(struct Translator* t, struct line* ln, char* suffix, int* ind) {
-	pushtoclean(t, label);
+	checkinfun(t, ln);
-	return label;
+	(*ind)++;
+	int sz = (t->lastfunlen + countplaces(*ind) + strlen(suffix) + 3) * sizeof(char);
+	char* lab = (char*)malloc(sz);
+	snprintf(lab, sz, "%s$%s.%i", t->lastfun, suffix, (*ind));
+	pushtoclean(t, lab);
+	return lab;
+}
+
+char* mkcmplab(struct Translator* t, struct line* ln) {
+	return mkspeciallab(t, ln, "cmp", &(t->cmpind));
+}
+
+char* mkretlab(struct Translator* t, struct line* ln) {
+	return mkspeciallab(t, ln, "ret", &(t->retind));
 }
 
 char* mkind(struct Translator* t, struct line* ln, int indlen) {
-	checkind(ln, indlen);
+	checkind(t, ln, indlen);
 	int newsz = sizeof(char) * (indlen + 2);
 	char* newind = (char*)malloc(newsz);
 	snprintf(newind, newsz, "@%s", ln->tokens[2]);
@@ -137,6 +163,14 @@ char* atlab(struct Translator* t, char* label, int labellen) {
 	return newind;
 }
 
+char* atn(struct Translator* t, int n) {
+	int newsz = sizeof(char) * (countplaces(n) + 2);
+	char* newind = (char*)malloc(newsz);
+	snprintf(newind, newsz, "@%i", n);
+	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);
@@ -145,8 +179,16 @@ char* mklab(struct Translator* t, char* label, int labellen) {
 	return newind;
 }
 
+char* mkgotolab(struct Translator* t, struct line* ln) {
+	int sz = sizeof(char) * (t->lastfunlen + strlen(ln->tokens[1]) + 3);
+	char* lab = (char*)malloc(sz);
+	snprintf(lab, sz, "@%s$%s", t->lastfun, ln->tokens[1]);
+	pushtoclean(t, lab);
+	return lab;
+}
+
 char* mkstatind(struct Translator* t, struct line* ln, int indlen) {
-	checkind(ln, indlen);
+	checkind(t, 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]);
@@ -155,7 +197,7 @@ char* mkstatind(struct Translator* t, struct line* ln, int indlen) {
 }
 
 char* mktempind(struct Translator* t, struct line* ln, int indlen) {
-	checkind(ln, indlen);
+	checkind(t, ln, indlen);
 	int intind = atoi(ln->tokens[2]);
 	int newsz = sizeof(char) * (indlen + 3);
 	char* newind = (char*)malloc(newsz);
@@ -166,7 +208,7 @@ char* mktempind(struct Translator* t, struct line* ln, int indlen) {
 
 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);
+		fprintf(stderr, "Invalid index '%s'; file %s.vm, line %i\n", t->fname, ln->tokens[2], ln->truen);
 		exit(1);
 	}
 	char* ptr;
@@ -178,7 +220,7 @@ char* mkpointerind(struct Translator* t, struct line* ln, int indlen) {
 			ptr = "THAT";
 			break;
 		default:
-			fprintf(stderr, "Invalid index '%s'; line %i\n", ln->tokens[2], ln->truen);
+			fprintf(stderr, "Invalid index '%s'; file %s.vm, line %i\n", t->fname, ln->tokens[2], ln->truen);
 			exit(1);
 	}
 	int newsz = sizeof(char) * 6;
@@ -189,50 +231,66 @@ char* mkpointerind(struct Translator* t, struct line* ln, int indlen) {
 }
 
 void checkasmsize(struct Translator* t, int toadd) {
-	int targ = sizeof(struct asmln*)*(t->asmind+toadd);
+	int targ = sizeof(char*)*(t->asmind+toadd);
 	if(targ >= t->asmsize) {
 		t->asmsize = targ * 2;
-		t->asmlns = (struct asmln**)realloc(t->asmlns, t->asmsize);
+		t->asmlns = (char**)realloc(t->asmlns, t->asmsize);
 	}
 }
 
-struct asmln* mkasmln(struct line* ln, char* content) {
+void checkopamnt(struct Translator* t, int amnt, struct line* ln) {
-	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);
+		fprintf(stderr, "Missing memory segment; file %s.vm, line %i\n", t->fname, ln->truen);
 		exit(1);
 	}
 	if(amnt > 2)
 		if(ln->tokenscount < 3) {
-			fprintf(stderr, "Missing operation index; line %i", ln->truen);
+			fprintf(stderr, "Missing operation index; file %s.vm, line %i\n", t->fname, ln->truen);
 			exit(1);
 		}
 }
 
-void addasmlns(struct Translator* t, struct line* ln, char** insts, int instcount) {
+void checklab(struct Translator* t, struct line* ln) {
+	if(ln->tokenscount < 2) {
+		fprintf(stderr, "Expected label; file %s.vm, line %i\n", t->fname, ln->truen);
+		exit(1);
+	}
+}
+
+void checkfun(struct Translator* t, struct line* ln) {
+	if(ln->tokenscount < 2) {
+		fprintf(stderr, "Expected function; file %s.vm, line %i\n", t->fname, ln->truen);
+		exit(1);
+	}
+
+	if(ln->tokenscount < 3) {
+		fprintf(stderr, "Expected argument amount; file %s.vm, line %i\n", t->fname, ln->truen);
+		exit(1);
+	}
+}
+
+void addasm(struct Translator* t, 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->asmlns[t->asmind] = insts[i];
 		t->asmind++;
 	}
 }
 
+void addasmlns(struct Translator* t, struct line* ln, char** insts, int instcount) {
+	// instruction comment
+	insts[0] = mkcom(t, ln);
+	
+	addasm(t, insts, instcount);
+}
+
 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");
+	insts[2] = heapstrtoclean(t, "D=M");
 
 	// @i
 	insts[3] = mkind(t, ln, indlen);
@@ -277,7 +335,7 @@ void popstat(struct Translator* t, struct line* ln, int indlen) {
 	tpopstat[TPOPSTATN-2] = mkstatind(t, ln, indlen);
 
 	// M=D
-	tpopstat[TPOPSTATN-1] = heapstr(t, "M=D");
+	tpopstat[TPOPSTATN-1] = heapstrtoclean(t, "M=D");
 
 	addasmlns(t, ln, tpopstat, TPOPSTATN);
 }
@@ -287,7 +345,7 @@ void poptemp(struct Translator* t, struct line* ln, int indlen) {
 	tpoptemp[TPOPTEMPN-2] = mktempind(t, ln, indlen);
 
 	// M=D
-	tpoptemp[TPOPTEMPN-1] = heapstr(t, "M=D");
+	tpoptemp[TPOPTEMPN-1] = heapstrtoclean(t, "M=D");
 
 	addasmlns(t, ln, tpoptemp, TPOPTEMPN);
 }
@@ -297,7 +355,7 @@ void poppointer(struct Translator* t, struct line* ln, int indlen) {
 	tpoppointer[TPOPPOINTERN-2] = mkpointerind(t, ln, indlen);
 
 	// M=D
-	tpoppointer[TPOPPOINTERN-1] = heapstr(t, "M=D");
+	tpoppointer[TPOPPOINTERN-1] = heapstrtoclean(t, "M=D");
 
 	addasmlns(t, ln, tpoppointer, TPOPPOINTERN);
 }
@@ -309,7 +367,7 @@ void pop(struct Translator* t, struct line* ln, int indlen) {
 }
 
 void arith(struct Translator* t, struct line* ln, char* op) {
-	tarith[TARITHN-1] = heapstr(t, op);
+	tarith[TARITHN-1] = heapstrtoclean(t, op);
 
 	addasmlns(t, ln, tarith, TARITHN);
 }
@@ -322,7 +380,7 @@ void comp(struct Translator* t, struct line* ln, char* op) {
 	tcomp[TCOMPN-6] = atlab(t, label, labellen);
 	
 	// D;J(op)
-	int opsz = sizeof(char)*6;
+	int opsz = sizeof(char) * 6;
 	char* trueop = (char*)malloc(opsz);
 	snprintf(trueop, opsz, "D;J%s", op);
 	tcomp[TCOMPN-5] = trueop;
@@ -335,43 +393,116 @@ void comp(struct Translator* t, struct line* ln, char* op) {
 };
 
 void label(struct Translator* t, struct line* ln) {
-	if(ln->tokenscount < 2) {
+	checklab(t, ln);
-		fprintf(stderr, "Expected label; line %i", ln->truen);
-		exit(1);
-	}
 	
-	// (label)
+	// (funcname$label)
-	tlabel[TLABELN-1] = mklab(t, ln->tokens[1], strlen(ln->tokens[1]));
+	checkinfun(t, ln);
+	int sz = (t->lastfunlen + strlen(ln->tokens[1]) + 4) * sizeof(char);
+	char* lab = (char*)malloc(sz);
+	snprintf(lab, sz, "(%s$%s)", t->lastfun, ln->tokens[1]);
+	pushtoclean(t, lab);
+	tlabel[TLABELN-1] = lab;
 
 	addasmlns(t, ln, tlabel, TLABELN);
 }
 
 void mygoto(struct Translator* t, struct line* ln) {
-	if(ln->tokenscount < 2) {
+	checklab(t, ln);
-		fprintf(stderr, "Expected label; line %i", ln->truen);
-		exit(1);
-	}
 
 	// @label
-	tgoto[TGOTON-2] = atlab(t, ln->tokens[1], strlen(ln->tokens[1]));
+	tgoto[TGOTON-2] = mkgotolab(t, ln);
 
 	addasmlns(t, ln, tgoto, TGOTON);
 }
 
 void ifgoto(struct Translator* t, struct line* ln) {
-	if(ln->tokenscount < 2) {
+	checklab(t, ln);
-		fprintf(stderr, "Expected label; line %i", ln->truen);
-		exit(1);
-	}
 	
 	// @label
-	tifgoto[TIFGOTON-2] = atlab(t, ln->tokens[1], strlen(ln->tokens[1]));
+	tifgoto[TIFGOTON-2] = mkgotolab(t, ln);
 
 	addasmlns(t, ln, tifgoto, TIFGOTON);
 }
 
+int pushframe(struct Translator* t, struct line* ln, char* retlab, int retlablen) {
+	tcallstart[1] = atlab(t, retlab, retlablen);
+
+	addasmlns(t, ln, tcallstart, TCALLSTARTN);
+
+	for(int i = 0; i < TFRAMEVARSN; i++) {
+		tcallpush[0] = tframevars[i];
+		addasm(t, tcallpush, TCALLPUSHN);
+	}
+
+	return TFRAMEVARSN + 1;
+}
+
+void call(struct Translator* t, struct line* ln) {
+	checkfun(t, ln);
+	
+	// return label
+	char* retlab = mkretlab(t, ln);
+	int retlablen = strlen(retlab);
+
+	// push frame
+	int framesize = pushframe(t, ln, retlab, retlablen);
+
+	// setting ARG
+	int nargslen = strlen(ln->tokens[2]);
+	checknargs(t, ln, nargslen);
+	int nargs = atoi(ln->tokens[2]);
+	tcallsetarg[TCALLSETARGN-4] = atn(t, nargs + framesize);
+	addasm(t, tcallsetarg, TCALLSETARGN);
+	
+	// jmp
+	int jmplen = strlen(ln->tokens[1]);
+	tcalljmp[TCALLJMPN-3] = atlab(t, ln->tokens[1], jmplen);
+	tcalljmp[TCALLJMPN-1] = mklab(t, retlab, retlablen);
+	addasm(t, tcalljmp, TCALLJMPN);
+}
+
+void function(struct Translator* t, struct line* ln) {
+	if(!t->returned) {
+		fprintf(stderr, "Last function did not return; file %s.vm, line %i\n", t->fname, ln->truen);
+		exit(1);
+	}
+
+	checkfun(t, ln);
+
+	t->lastfun = ln->tokens[1];
+	int funlen = strlen(ln->tokens[1]);
+	t->lastfunlen = funlen;
+	t->funcount++;
+	t->retind = 0;
+	t->cmpind = 0;
+
+	// (funcname)
+	tfunction[1] = mklab(t, ln->tokens[1], funlen);
+	addasmlns(t, ln, tfunction, TFUNCTIONN);
+
+	// repeat nVars times:
+	int nlocalslen = strlen(ln->tokens[2]);
+	checknlocals(t, ln, nlocalslen);
+	int nlocals = atoi(ln->tokens[2]);
+
+	for(int i = 0; i < nlocals; i++) {
+		addasm(t, tfunctionpush, TFUNCTIONPUSHN);
+	}
+}
+
+void myreturn(struct Translator* t, struct line* ln) {
+	addasmlns(t, ln, tstartreturn, TSTARTRETURNN);
+	
+	for(int i = TFRAMEVARSN-1; i >= 0; i--) {
+		tretpop[TRETPOPN-2] = tframevars[i];
+		addasm(t, tretpop, TRETPOPN);
+	}
+
+	addasm(t, tendreturn, TENDRETURNN);
+}
+
 void switchpush(struct Translator* t, struct line* ln) {
-	checkopamnt(3, ln);
+	checkopamnt(t, 3, ln);
 	char* seg = ln->tokens[1];
 	int indlen = strlen(ln->tokens[2]);
 
@@ -388,7 +519,7 @@ void switchpush(struct Translator* t, struct line* ln) {
 }
 
 void switchpop(struct Translator* t, struct line* ln) {
-	checkopamnt(3, ln);
+	checkopamnt(t, 3, ln);
 	char* seg = ln->tokens[1];
 	int indlen = strlen(ln->tokens[2]);
 
@@ -404,6 +535,7 @@ void switchpop(struct Translator* t, struct line* ln) {
 
 void switchop(struct Translator* t, struct line* ln) {
 	char* op = ln->tokens[0];
+	short returned = 0;
 
 	if(!strcmp(op, "push"))
 		switchpush(t, ln);
@@ -433,23 +565,41 @@ void switchop(struct Translator* t, struct line* ln) {
 		mygoto(t, ln);
 	else if(!strcmp(op, "if-goto"))
 		ifgoto(t, ln);
+	else if(!strcmp(op, "return")) {
+		myreturn(t, ln);
+		returned = 1;
+	}
+	else if(!strcmp(op, "function"))
+		function(t, ln);
+	else if(!strcmp(op, "call"))
+		call(t, ln);
 	else {
-		fprintf(stderr, "Unrecognized operation '%s'; line %i\n", op, ln->truen);
+		fprintf(stderr, "Unrecognized operation '%s'; file %s.vm, line %i\n", t->fname, op, ln->truen);
 		exit(1);
 	}
+
+	t->returned = returned;
 }
 
 void translate(struct Translator* t) {
 	for(int i = 0; i < t->lns->count; i++)
 		switchop(t, t->lns->lns[i]);
+
+	if(!t->returned) {
+		fprintf(stderr, "Expected return before end of file; file %s.vm, line %i\n", t->fname, t->lns->count-1);
+		exit(1);
+	}
 }
 
 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->asmsize = sizeof(char*)*(lns->count * 15);
 	t->asmind = 0;
-	t->compcount = 0;
+	t->funcount = 0;
-	t->asmlns = (struct asmln**)malloc(t->asmsize);
+	t->retind = 0;
+	t->cmpind = 0;
+	t->returned = 1;
+	t->asmlns = (char**)malloc(t->asmsize);
 
 	t->tocleanind = 0;
 	t->tocleansize = sizeof(char*)*(lns->count * 5);

translator.h

@@ -2,13 +2,8 @@
 #define translator
 #include "parser.h"
 
-struct asmln {
-	char* instr;
-	int truen;
-};
-
 struct Translator {
-	struct asmln** asmlns;
+	char** asmlns;
 	int asmind;
 	int asmsize;
 	char** toclean;
@@ -17,7 +12,12 @@ struct Translator {
 	struct lnarray* lns;
 	char* fname;
 	int fnamelen;
-	int compcount;
+	char* lastfun;
+	int lastfunlen;
+	int funcount;
+	int retind;
+	int cmpind;
+	short returned;
 };
 
 void freetranslator(struct Translator* t);

util.c

@@ -0,0 +1,10 @@
+#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;
+}

util.h

@@ -0,0 +1 @@
+char* heapstr(const char* str, int len);