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Add compiler and vm-translator

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Augusto Gunsch 2021-01-04 17:00:48 -03:00
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The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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FILES = *.c */*.c
LIBRARIES = -lpthread
INCLUDES = -I. -I./parser/ -I./compiler/ -I./vm/ -I./tokenizer/ -I./misc/
CFLAGS = -std=c99 -Wall
OUTFILE = jackc
main: ${FILES}
${CC} ${CFLAGS} ${LIBRARIES} ${INCLUDES} -o ${OUTFILE} ${FILES}

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# jackc
Jack language compiler, but instead of producing ".vm" files, it produces binary ".hack" files straight away<br>

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#include <stdlib.h>
#include <string.h>
#include "compiler-expressions.h"
#include "compiler-util.h"
/* BEGIN FORWARD DECLARATIONS */
// Miscelaneous
LINE* pushconstant(int n);
LINE* mathopln(char op);
LINE* pushthat();
int countexpressions(EXPRESSIONLIST* explist);
char* toascii(char c);
// Dealing with singular terms
LINEBLOCK* compilestrconst(char* str);
LINEBLOCK* compilekeywordconst(SCOPE* s, TERM* t);
LINEBLOCK* compilearrayitem(SCOPE* s, TERM* t);
LINEBLOCK* compilecallln(SCOPE* s, SUBROUTDEC* d, SUBROUTCALL* call);
LINEBLOCK* pushunaryopterm(SCOPE* s, TERM* t);
LINEBLOCK* compileterm(SCOPE* s, TERM* t);
/* END FORWARD DECLARATIONS */
// Miscelaneous
LINE* mathopln(char op) {
if(op == '+')
return onetoken("add");
if(op == '-')
return onetoken("sub");
if(op == '=')
return onetoken("eq");
if(op == '>')
return onetoken("gt");
if(op == '<')
return onetoken("lt");
if(op == '|')
return onetoken("or");
if(op == '&')
return onetoken("and");
if(op == '/') {
char* tokens[] = { "call", "Math.divide", "2" };
return mkln(tokens);
}
char* tokens[] = { "call", "Math.multiply", "2" };
return mkln(tokens);
}
LINE* pushconstant(int n) {
char* tokens[] = { "push", "constant", itoa(n) };
LINE* ln = mkln(tokens);
free(tokens[2]);
return ln;
}
LINE* pushthat() {
char* pushthat[] = { "push", "that", "0" };
return mkln(pushthat);
}
int countexpressions(EXPRESSIONLIST* explist) {
int i = 0;
while(explist != NULL) {
i++;
explist = explist->next;
}
return i;
}
char* toascii(char c) {
char* result = (char*)malloc(sizeof(char) * (countplaces(c) + 1));
sprintf(result, "%i", c);
return result;
}
// Dealing with singular terms
LINEBLOCK* compilestrconst(char* str) {
if(str[0] == '\0')
return NULL;
char* pushchar[] = { "push", "constant", toascii(str[0]) };
LINEBLOCK* blk = mklnblk(mksimpleln(pushchar, strcount(pushchar)));
free(pushchar[2]);
char* appendchar[] = { "call", "String.appendChar", "2" };
appendln(blk, mkln(appendchar));
int i = 1;
char c;
while(c = str[i], c != '\0') {
pushchar[2] = toascii(c);
appendln(blk, mksimpleln(pushchar, strcount(pushchar)));
free(pushchar[2]);
appendln(blk, mksimpleln(appendchar, strcount(appendchar)));
i++;
}
char* strsize[] = { "push", "constant", itoa(i) };
char* mknew[] = { "call", "String.new", "1" };
appendlnbefore(blk, mkln(mknew));
appendlnbefore(blk, mkln(strsize));
free(strsize[2]);
return blk;
}
LINE* pushthisadd() {
char* pushthisadd[] = { "push", "pointer", "0" };
return mkln(pushthisadd);
}
LINE* pushfalse() {
return pushconstant(0);
}
LINEBLOCK* pushtrue() {
LINEBLOCK* blk = mklnblk(pushfalse());
appendln(blk, onetoken("not"));
return blk;
}
LINEBLOCK* compilekeywordconst(SCOPE* s, TERM* t) {
if(!strcmp(t->string, "this")) return mklnblk(pushthisadd());
if(!strcmp(t->string, "false")) return mklnblk(pushfalse());
if(!strcmp(t->string, "true")) return pushtrue();
return mklnblk(pushconstant(0));
}
LINEBLOCK* compilearrayitem(SCOPE* s, TERM* t) {
LINEBLOCK* blk = compileexpression(s, t->array->exp);
appendln(blk, pushvar(s, t->array->name));
appendln(blk, onetoken("add"));
appendln(blk, popthatadd());
appendln(blk, pushthat());
return blk;
}
LINEBLOCK* compilecallln(SCOPE* s, SUBROUTDEC* d, SUBROUTCALL* call) {
LINE* ln = mkline(3);
addtoken(ln, ezheapstr("call"));
addtoken(ln, dotlabel(d->class->name, call->name));
int count = countexpressions(call->parameters);
if(d->subroutclass == method)
count++;
addtoken(ln, itoa(count));
return mklnblk(ln);
}
LINEBLOCK* compilesubroutcall(SCOPE* s, SUBROUTCALL* call) {
VAR* v;
SUBROUTDEC* d = getsubroutdecfromcall(s, call, &v);
LINEBLOCK* blk = compilecallln(s, d, call);
if(call->parameters != NULL)
blk = mergelnblks(compileexplist(s, call->parameters), blk);
if(d->subroutclass == method) {
if(call->parentname == NULL)
appendlnbefore(blk, pushthisadd());
else
appendlnbefore(blk, pushvarraw(s, v));
}
// void functions always return 0
// therefore must be thrown away
if(!strcmp(d->type, "void")) {
appendln(blk, poptemp());
}
return blk;
}
LINEBLOCK* pushunaryopterm(SCOPE* s, TERM* t) {
LINEBLOCK* blk = compileexpression(s, t->expression);
LINE* neg;
if(t->unaryop == '-')
neg = onetoken("neg");
else
neg = onetoken("not");
appendln(blk, neg);
return blk;
}
LINEBLOCK* compileterm(SCOPE* s, TERM* t) {
if(t->type == varname) return mklnblk(pushvar(s, t->string));
if(t->type == intconstant) return mklnblk(pushconstant(t->integer));
if(t->type == stringconstant) return compilestrconst(t->string);
if(t->type == keywordconstant) return compilekeywordconst(s, t);
if(t->type == arrayitem) return compilearrayitem(s, t);
if(t->type == subroutcall) return compilesubroutcall(s, t->call);
if(t->type == innerexpression) return compileexpression(s, t->expression);
return pushunaryopterm(s, t);
}
// Dealing with whole expressions
LINEBLOCK* compileexpression(SCOPE* s, TERM* e) {
LINEBLOCK* blk = NULL;
if(e != NULL) {
while(true) {
blk = mergelnblks(blk, compileterm(s, e));
if(e->next == NULL)
break;
appendln(blk, mathopln(e->op));
e = e->next;
}
}
return blk;
}
LINEBLOCK* compileexplist(SCOPE* s, EXPRESSIONLIST* explist) {
LINEBLOCK* head = NULL;
while(explist != NULL) {
head = mergelnblks(head, compileexpression(s, explist->expression));
explist = explist->next;
}
return head;
}

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#ifndef COMPILER_EXPRESSIONS_H
#define COMPILER_EXPRESSIONS_H
#include "vm-lines.h"
#include "compiler.h"
/* compiler-expressions
* Functions for dealing and compiling expressions and singular terms. */
// Dealing with singular terms
LINEBLOCK* compilesubroutcall(SCOPE* s, SUBROUTCALL* call);
// Dealing with whole expressions
LINEBLOCK* compileexpression(SCOPE* s, TERM* e);
LINEBLOCK* compileexplist(SCOPE* s, EXPRESSIONLIST* explist);
#endif

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#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <pthread.h>
#include "compiler.h"
#include "compiler-scopes.h"
#include "os.h"
typedef enum { local, staticseg, arg, fieldseg } MEMSEGMENT;
char* memsegnames[] = { "local", "static", "argument", "this" };
// Error messages
void doubledeclaration(const char* name, DEBUGINFO* d1, DEBUGINFO* d2);
void ensurenoduplicate(SCOPE* s, char* name);
// Getters
VAR* getvarinvars(VAR* vars, const char* name);
CLASS* getclass(SCOPE* s, const char* name);
SUBROUTDEC* getsubroutdecfromlist(SUBROUTDEC* start, char* name);
SUBROUTDEC* getmethod(SCOPE* s, VAR* parent, SUBROUTCALL* call);
SUBROUTDEC* getfunction(SCOPE* s, SUBROUTCALL* call);
SUBROUTDEC* getsubroutdecwithparent(SCOPE* s, SUBROUTCALL* call, VAR** varret);
SUBROUTDEC* getsubroutdecwithoutparent(SCOPE* s, SUBROUTCALL* call);
SUBROUTDEC* getsubroutdec(SCOPE* s, const char* name);
// Scope adding
VAR* mkvar(char* type, char* name, bool primitive, DEBUGINFO* debug, MEMSEGMENT seg, int i);
void addvar(SCOPE* s, VAR** dest, VAR* v);
void addlocalvar(SCOPE* s, VARDEC* v, int* i);
void addstaticvar(SCOPE* s, CLASSVARDEC* v);
void addfield(SCOPE* s, CLASSVARDEC* v, int* i);
void addclassvardec(SCOPE* s, CLASSVARDEC* v, int* i);
void addparameter(SCOPE* s, PARAMETER* p, int* i);
// Error messages
void doubledeclaration(const char* name, DEBUGINFO* d1, DEBUGINFO* d2) {
eprintf("Double declaration of '%s' at '%s', line %i; previously defined at '%s', line %i\n",
name, d1->file, d1->definedat, d2->file, d2->definedat);
exit(1);
}
void notdeclared(const char* name, DEBUGINFO* debug) {
eprintf("'%s' not declared; file '%s', line %i\n", name, debug->file, debug->definedat);
exit(1);
}
void invalidparent(SUBROUTCALL* call) {
eprintf("Invalid subroutine parent '%s'; file '%s', line %i\n", call->parentname, call->debug->file, call->debug->definedat);
exit(1);
}
void ensurenoduplicate(SCOPE* s, char* name) {
VAR* v = getvar(s, name);
if(v != NULL)
doubledeclaration(name, s->currdebug, v->debug);
CLASS* c = getclass(s, name);
if(c != NULL)
doubledeclaration(name, s->currdebug, c->debug);
SUBROUTDEC* sr = getsubroutdec(s, name);
if(sr != NULL)
doubledeclaration(name, s->currdebug, sr->debug);
}
// Scope handling
SCOPE* mkscope(SCOPE* prev) {
SCOPE* s = (SCOPE*)malloc(sizeof(SCOPE));
s->previous = prev;
if(prev != NULL)
s->compiler = prev->compiler;
s->localvars = NULL;
s->fields = NULL;
s->staticvars = NULL;
s->parameters = NULL;
s->classes = NULL;
s->subroutines = NULL;
return s;
}
// Getters
VAR* getvarinvars(VAR* vars, const char* name) {
while(vars != NULL) {
if(!strcmp(vars->name, name))
return vars;
vars = vars->next;
}
return NULL;
}
VAR* getvar(SCOPE* s, const char* name) {
VAR* var = getvarinvars(s->localvars, name);
if(var != NULL)
return var;
var = getvarinvars(s->parameters, name);
if(var != NULL)
return var;
var = getvarinvars(s->fields, name);
if(var != NULL)
return var;
var = getvarinvars(s->staticvars, name);
if(var != NULL)
return var;
if(s->previous != NULL)
return getvar(s->previous, name);
return NULL;
}
CLASS* getclass(SCOPE* s, const char* name) {
CLASS* curr = s->classes;
while(curr != NULL) {
if(!strcmp(curr->name, name))
return curr;
curr = curr->next;
}
if(s->previous != NULL)
return getclass(s->previous, name);
return getosclass(s->compiler->os, name);
}
SUBROUTDEC* getsubroutdecfromlist(SUBROUTDEC* start, char* name) {
while(start != NULL) {
if(!strcmp(start->name, name))
return start;
start = start->next;
}
return NULL;
}
SUBROUTDEC* getmethod(SCOPE* s, VAR* parent, SUBROUTCALL* call) {
CLASS* c = getclass(s, parent->type);
SUBROUTDEC* d = getsubroutdecfromlist(c->subroutdecs, call->name);
if(d == NULL)
return NULL;
if(d->subroutclass != method) {
eprintf("Calling a function/constructor as if it were a method; file '%s', line %i\n", call->debug->file, call->debug->definedat);
exit(1);
}
return d;
}
SUBROUTDEC* getfunction(SCOPE* s, SUBROUTCALL* call) {
CLASS* c = getclass(s, call->parentname);
if(c == NULL)
notdeclared(call->parentname, call->debug);
SUBROUTDEC* d = getsubroutdecfromlist(c->subroutdecs, call->name);
if(d == NULL)
return NULL;
if(d->subroutclass == method) {
eprintf("Calling a method as if it were a function; file '%s', line %i\n", call->debug->file, call->debug->definedat);
exit(1);
}
return d;
}
SUBROUTDEC* getsubroutdecwithparent(SCOPE* s, SUBROUTCALL* call, VAR** varret) {
VAR* parent = getvar(s, call->parentname);
if(parent != NULL) {
if(parent->primitive) {
eprintf("Primitive type does not have subroutines; file '%s', line %i\n", call->debug->file, call->debug->definedat);
exit(1);
}
*varret = parent;
return getmethod(s, parent, call);
}
else
return getfunction(s, call);
}
SUBROUTDEC* getsubroutdecwithoutparent(SCOPE* s, SUBROUTCALL* call) {
SUBROUTDEC* d = getsubroutdecfromlist(s->currclass->subroutdecs, call->name);
return d;
}
SUBROUTDEC* getsubroutdecfromcall(SCOPE* s, SUBROUTCALL* call, VAR** varret) {
SUBROUTDEC* d;
*varret = NULL;
if(call->parentname != NULL) {
d = getossubroutdec(s->compiler->os, call);
if(d == NULL)
d = getsubroutdecwithparent(s, call, varret);
}
else {
d = getsubroutdecwithoutparent(s, call);
}
if(d == NULL)
notdeclared(call->name, call->debug);
return d;
}
SUBROUTDEC* getsubroutdec(SCOPE* s, const char* name) {
SUBROUTDEC* curr = s->subroutines;
while(curr != NULL) {
if(!strcmp(curr->name, name))
return curr;
curr = curr->next;
}
if(s->previous != NULL)
return getsubroutdec(s->previous, name);
return NULL;
}
// Scope adding
VAR* mkvar(char* type, char* name, bool primitive, DEBUGINFO* debug, MEMSEGMENT seg, int i) {
VAR* v = (VAR*)malloc(sizeof(VAR));
v->name = name;
v->type = type;
v->debug = debug;
v->memsegment = memsegnames[seg];
v->primitive = primitive;
v->index = i;
return v;
}
void addvar(SCOPE* s, VAR** dest, VAR* v) {
ensurenoduplicate(s, v->name);
if(!v->primitive) {
CLASS* type = getclass(s, v->type);
if(type == NULL)
notdeclared(v->type, v->debug);
}
v->next = *dest;
*dest = v;
}
void addlocalvar(SCOPE* s, VARDEC* v, int* i) {
STRINGLIST* currname = v->names;
while(currname != NULL) {
addvar(s, &(s->localvars), mkvar(v->type, currname->content, v->primitive, v->debug, local, *i));
currname = currname->next;
(*i)++;
}
}
void addstaticvar(SCOPE* s, CLASSVARDEC* v) {
STRINGLIST* currname = v->base->names;
pthread_mutex_lock(&(s->compiler->staticmutex));
static int i = 0;
while(currname != NULL) {
addvar(s, &(s->staticvars), mkvar(v->base->type, currname->content, v->base->primitive, v->base->debug, staticseg, i));
currname = currname->next;
i++;
}
pthread_mutex_unlock(&(s->compiler->staticmutex));
}
void addfield(SCOPE* s, CLASSVARDEC* v, int* i) {
STRINGLIST* currname = v->base->names;
while(currname != NULL) {
addvar(s, &(s->fields), mkvar(v->base->type, currname->content, v->base->primitive, v->base->debug, fieldseg, *i));
currname = currname->next;
(*i)++;
}
}
void addclassvardec(SCOPE* s, CLASSVARDEC* v, int* i) {
if(v->type == stat)
addstaticvar(s, v);
else {
addfield(s, v, i);
}
}
void addparameter(SCOPE* s, PARAMETER* p, int* i) {
addvar(s, &(s->parameters), mkvar(p->type, p->name, p->primitive, p->debug, arg, *i));
(*i)++;
}
// Group adding
void addclassvardecs(SCOPE* s, CLASSVARDEC* classvardecs) {
int i = 0;
while(classvardecs != NULL) {
addclassvardec(s, classvardecs, &i);
classvardecs = classvardecs->next;
}
}
void addlocalvars(SCOPE* s, VARDEC* localvars) {
int i = 0;
while(localvars != NULL) {
addlocalvar(s, localvars, &i);
localvars = localvars->next;
}
}
void addparameters(SCOPE* s, bool isformethod, PARAMETER* params) {
int i = isformethod ? 1 : 0;
while(params != NULL) {
addparameter(s, params, &i);
params = params->next;
}
}
void freevars(VAR* v) {
if(v != NULL) {
VAR* next = v->next;
free(v);
freevars(next);
}
}
void freescope(SCOPE* s) {
freevars(s->fields);
freevars(s->staticvars);
freevars(s->localvars);
freevars(s->parameters);
free(s);
};

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#ifndef COMPILER_SCOPES_H
#define COMPILER_SCOPES_H
#include "parser-tree.h"
#include "compiler.h"
/* compiler-scopes
* Tools for dealing with scopes.
*
* They can be used to create, expand and stack scopes, as well as to enforce
* certain semantic rules. */
// Data types
typedef struct var {
DEBUGINFO* debug;
char* memsegment;
char* type;
char* name;
int index;
bool primitive;
struct var* next;
} VAR;
typedef struct scope {
struct compiler* compiler;
DEBUGINFO* currdebug;
CLASS* currclass;
CLASS* classes;
SUBROUTDEC* subroutines;
VAR* fields;
VAR* staticvars;
VAR* localvars;
VAR* parameters;
struct scope* previous;
} SCOPE;
struct compiler;
// Group adding
void addclassvardecs(SCOPE* s, CLASSVARDEC* classvardecs);
void addlocalvars(SCOPE* s, VARDEC* localvars);
void addparameters(SCOPE* s, bool isformethod, PARAMETER* params);
// Scope handling
SCOPE* mkscope(SCOPE* prev);
// Single type getters
SUBROUTDEC* getsubroutdecfromcall(SCOPE* s, SUBROUTCALL* call, VAR** varret);
CLASS* getclass(SCOPE* s, const char* name);
// Generic getters
VAR* getvar(SCOPE* s, const char* name);
// Freeing
void freescope(SCOPE* s);
#endif

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#include <stdlib.h>
#include <string.h>
#include "compiler-expressions.h"
#include "compiler-statements.h"
#include "compiler-util.h"
/* BEGIN FORWARD DECLARATIONS */
// Miscelaneous
LINE* popthat();
LINE* pushtemp();
char* mkcondlabel(char* name, int count);
// Handling individual statements
LINEBLOCK* compileret(SCOPE* s, TERM* e);
LINEBLOCK* compileif(SCOPE* s, IFSTATEMENT* st);
LINEBLOCK* compilewhile(SCOPE* s, CONDSTATEMENT* w);
LINEBLOCK* compilelet(SCOPE* s, LETSTATEMENT* l);
LINEBLOCK* compilestatement(SCOPE* s, STATEMENT* st);
/* END FORWARD DECLARATIONS */
// Miscelaneous
LINE* popthat() {
char* popthat[] = { "pop", "that", "0" };
return mkln(popthat);
}
LINE* pushtemp() {
char* pushtemp[] = { "push", "temp", "0" };
return mkln(pushtemp);
}
char* mkcondlabel(char* name, int count) {
int sz = (strlen(name) + countplaces(count) + 1) * sizeof(char);
char* result = (char*)malloc(sz);
sprintf(result, "%s%i", name, count);
return result;
}
// Handling individual statements
LINEBLOCK* compileret(SCOPE* s, TERM* e) {
LINE* ret = onetoken("return");
LINEBLOCK* blk = mklnblk(ret);
// void subroutdecs return 0
if(e == NULL) {
char* tokens[] = { "push", "constant", "0" };
appendlnbefore(blk, mkln(tokens));
} else
blk = mergelnblks(compileexpression(s, e), blk);
return blk;
}
LINEBLOCK* compileif(SCOPE* s, IFSTATEMENT* st) {
LINEBLOCK* blk = compileexpression(s, st->base->expression);
pthread_mutex_lock(&(s->compiler->ifmutex));
static int ifcount = 0;
int mycount = ifcount;
ifcount++;
pthread_mutex_unlock(&(s->compiler->ifmutex));
char* truelabel = mkcondlabel("IF_TRUE", mycount);
char* ifgoto[] = { "if-goto", truelabel };
appendln(blk, mkln(ifgoto));
char* falselabel = mkcondlabel("IF_FALSE", mycount);
char* gotofalse[] = { "goto", falselabel };
appendln(blk, mkln(gotofalse));
char* truelabelln[] = { "label", truelabel };
appendln(blk, mkln(truelabelln));
blk = mergelnblks(blk, compilestatements(s, st->base->statements));
char* endlabel;
bool haselse = st->elsestatements != NULL;
if(haselse) {
endlabel = mkcondlabel("IF_END", mycount);
char* endgoto[] = { "goto", endlabel };
appendln(blk, mkln(endgoto));
}
char* falselabelln[] = { "label", falselabel};
appendln(blk, mkln(falselabelln));
if(haselse) {
blk = mergelnblks(blk, compilestatements(s, st->elsestatements));
char* endlabelln[] = { "label", endlabel };
appendln(blk, mkln(endlabelln));
free(endlabel);
}
free(falselabel);
free(truelabel);
return blk;
}
LINEBLOCK* compilewhile(SCOPE* s, CONDSTATEMENT* w) {
LINEBLOCK* blk = compileexpression(s, w->expression);
pthread_mutex_lock(&(s->compiler->whilemutex));
static int whilecount = 0;
int mycount = whilecount;
whilecount++;
pthread_mutex_unlock(&(s->compiler->whilemutex));
char* explabel = mkcondlabel("WHILE_EXP", mycount);
char* explabelln[] = { "label", explabel };
appendlnbefore(blk, mkln(explabelln));
appendln(blk, onetoken("not"));
char* endlabel = mkcondlabel("WHILE_END", mycount);
char* ifgoto[] = { "if-goto", endlabel };
appendln(blk, mkln(ifgoto));
blk = mergelnblks(blk, compilestatements(s, w->statements));
char* gotoln[] = { "goto", explabel };
appendln(blk, mkln(gotoln));
char* endlabelln[] = { "label", endlabel };
appendln(blk, mkln(endlabelln));
free(explabel);
free(endlabel);
return blk;
}
LINEBLOCK* compilelet(SCOPE* s, LETSTATEMENT* l) {
LINEBLOCK* blk = compileexpression(s, l->expression);
if(l->arrayind != NULL) {
appendlnbefore(blk, onetoken("add"));
appendlnbefore(blk, pushvar(s, l->varname));
blk = mergelnblks(compileexpression(s, l->arrayind), blk);
appendln(blk, poptemp());
appendln(blk, popthatadd());
appendln(blk, pushtemp());
appendln(blk, popthat());
}
else
appendln(blk, popvar(s, l->varname));
return blk;
}
LINEBLOCK* compilestatement(SCOPE* s, STATEMENT* st) {
s->currdebug = st->debug;
if(st->type == dostatement) return compilesubroutcall(s, st->dostatement);
if(st->type == returnstatement) return compileret(s, st->retstatement);
if(st->type == ifstatement) return compileif(s, st->ifstatement);
if(st->type == whilestatement) return compilewhile(s, st->whilestatement);
return compilelet(s, st->letstatement);
}
LINEBLOCK* compilestatements(SCOPE* s, STATEMENT* sts) {
LINEBLOCK* head = NULL;
while(sts != NULL) {
head = mergelnblks(head, compilestatement(s, sts));
sts = sts->next;
}
return head;
}

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#ifndef COMPILER_STATEMENTS_H
#define COMPILER_STATEMENTS_H
#include "compiler.h"
/* compiler-statements
* Single function for compiling statements */
LINEBLOCK* compilestatements(SCOPE* s, STATEMENT* sts);
#endif

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#include <stdlib.h>
#include "compiler-statements.h"
#include "compiler-structure.h"
#include "compiler-util.h"
/* BEGIN FORWARD DECLARATIONS */
// Miscelaneous
int countlocalvars(VARDEC* decs);
int countstrs(STRINGLIST* ls);
int getobjsize(CLASS* c);
LINE* mksubdeclabel(CLASS* c, SUBROUTDEC* sd);
// Compiling methods
LINEBLOCK* compilefunbody(SCOPE* s, CLASS* cl, SUBROUTBODY* b);
LINEBLOCK* compilefundec(SCOPE* s, CLASS* cl, SUBROUTDEC* f);
LINEBLOCK* compileconstructor(SCOPE* s, CLASS* cl, SUBROUTDEC* con);
LINEBLOCK* compilemethod(SCOPE* s, CLASS* cl, SUBROUTDEC* m);
/* END FORWARD DECLARATIONS */
// Miscelaneous
int countlocalvars(VARDEC* decs) {
int i = 0;
while(decs != NULL) {
STRINGLIST* curr = decs->names;
while(curr != NULL) {
i++;
curr = curr->next;
}
decs = decs->next;
}
return i;
}
int countstrs(STRINGLIST* ls) {
int count = 0;
while(ls != NULL) {
count++;
ls = ls->next;
}
return count;
}
int getobjsize(CLASS* c) {
CLASSVARDEC* curr = c->vardecs;
int count = 0;
while(curr != NULL) {
if(curr->type == field)
count += countstrs(curr->base->names);
curr = curr->next;
}
return count;
}
LINE* mksubdeclabel(CLASS* c, SUBROUTDEC* sd) {
char* labelstrs[] = { "function", dotlabel(c->name, sd->name), itoa(countlocalvars(sd->body->vardecs)) };
LINE* label = mkln(labelstrs);
free(labelstrs[1]);
free(labelstrs[2]);
label->next = NULL;
return label;
}
// Compiling methods
LINEBLOCK* compilefunbody(SCOPE* s, CLASS* cl, SUBROUTBODY* b) {
SCOPE* myscope = mkscope(s);
myscope->currclass = cl;
if(b->vardecs != NULL)
addlocalvars(myscope, b->vardecs);
LINEBLOCK* head = compilestatements(myscope, b->statements);
freescope(myscope);
return head;
}
LINEBLOCK* compilefundec(SCOPE* s, CLASS* cl, SUBROUTDEC* f) {
LINE* label = mksubdeclabel(cl, f);
if(f->body->statements != NULL) {
LINEBLOCK* body = compilefunbody(s, cl, f->body);
appendlnbefore(body, label);
return body;
}
else
return mklnblk(label);
}
LINEBLOCK* compileconstructor(SCOPE* s, CLASS* cl, SUBROUTDEC* con) {
LINE* label = mksubdeclabel(cl, con);
LINEBLOCK* blk = mklnblk(label);
char* size[] = { "push", "constant", itoa(getobjsize(cl)) };
char* memalloc[] = { "call", "Memory.alloc", "1" };
char* poppointer[] = { "pop", "pointer", "0" };
appendln(blk, mkln(size));
appendln(blk, mkln(memalloc));
appendln(blk, mkln(poppointer));
free(size[2]);
if(con->body != NULL)
return mergelnblks(blk, compilefunbody(s, cl, con->body));
else
return blk;
}
LINEBLOCK* compilemethod(SCOPE* s, CLASS* cl, SUBROUTDEC* m) {
LINE* label = mksubdeclabel(cl, m);
LINEBLOCK* blk = mklnblk(label);
char* pusharg0[] = { "push", "argument", "0" };
char* poppointer[] = { "pop", "pointer", "0" };
appendln(blk, mkln(pusharg0));
appendln(blk, mkln(poppointer));
if(m->body != NULL)
return mergelnblks(blk, compilefunbody(s, cl, m->body));
else
return blk;
}
LINEBLOCK* compilesubroutdec(SCOPE* s, CLASS* cl, SUBROUTDEC* sd) {
SCOPE* myscope = mkscope(s);
LINEBLOCK* blk;
if(sd->parameters != NULL)
addparameters(myscope, sd->subroutclass == method, sd->parameters);
if(sd->subroutclass == function)
blk = compilefundec(myscope, cl, sd);
else if(sd->subroutclass == constructor)
blk = compileconstructor(myscope, cl, sd);
else
blk = compilemethod(myscope, cl, sd);
freescope(myscope);
return blk;
}

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#ifndef COMPILER_STRUCTURE_H
#define COMPILER_STRUCTURE_H
#include "compiler.h"
/* compiler-structure
* Module for dealing with and compiling general program structure. */
LINEBLOCK* compilesubroutdec(SCOPE* s, CLASS* cl, SUBROUTDEC* sd);
#endif

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#include <stdlib.h>
#include "compiler-util.h"
LINE* opvarraw(SCOPE* s, char* op, VAR* v) {
char* tokens[] = { op, v->memsegment, itoa(v->index) };
LINE* ln = mksimpleln(tokens, strcount(tokens));
free(tokens[2]);
return ln;
}
LINE* opvar(SCOPE* s, char* op, const char* name) {
VAR* v = getvar(s, name);
return opvarraw(s, op, v);
}
LINE* pushvarraw(SCOPE*s, VAR* v) {
return opvarraw(s, "push", v);
}
LINE* pushvar(SCOPE* s, const char* name) {
return opvar(s, "push", name);
}
LINE* popvar(SCOPE* s, const char* name) {
return opvar(s, "pop", name);
}
LINE* poptemp() {
char* poptemp[] = { "pop", "temp", "0" };
return mksimpleln(poptemp, strcount(poptemp));
}
LINE* popthatadd() {
char* popthatadd[] = { "pop", "pointer", "1" };
return mksimpleln(popthatadd, strcount(popthatadd));
}
LINE* onetoken(char* str) {
LINE* ln = mkline(1);
addtoken(ln, ezheapstr(str));
ln->next = NULL;
return ln;
}
LINE* mksimpleln(char** tokens, int count) {
LINE* ln = mkline(count);
for(int i = 0; i < count; i++)
addtoken(ln, ezheapstr(tokens[i]));
ln->next = NULL;
return ln;
}

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#ifndef COMPILER_UTIL_H
#define COMPILER_UTIL_H
#include "vm-lines.h"
#include "compiler-scopes.h"
#include "compiler.h"
/* compiler-util
* Random utilities used in the compiler module. */
#define mkln(id) mksimpleln(id, strcount(id))
LINE* onetoken(char* str);
LINE* mksimpleln(char** tokens, int count);
LINE* pushvarraw(SCOPE*s, VAR* v);
LINE* pushvar(SCOPE* s, const char* name);
LINE* popvar(SCOPE* s, const char* name);
LINE* poptemp();
LINE* popthatadd();
#endif

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#include <stdlib.h>
#include "os.h"
#include "compiler-structure.h"
#include "compiler.h"
/* This should be part of compiler-structure, but since it is used by other modules,
* it will stay here for convenience */
LINEBLOCK* compileclass(COMPILER* c, CLASS* class) {
SCOPE* topscope = mkscope(c->globalscope);
if(class->vardecs != NULL)
addclassvardecs(topscope, class->vardecs);
if(class->subroutdecs != NULL)
topscope->subroutines = class->subroutdecs;
LINEBLOCK* output = NULL;
SUBROUTDEC* curr = class->subroutdecs;
while(curr != NULL) {
output = mergelnblks(output, compilesubroutdec(topscope, class, curr));
curr = curr->next;
}
freescope(topscope);
return output;
}
COMPILER* mkcompiler(CLASS* classes) {
COMPILER* c = (COMPILER*)malloc(sizeof(COMPILER));
c->globalscope = mkscope(NULL);
c->globalscope->compiler = c;
c->globalscope->classes = classes;
c->classes = classes;
c->os = mkos();
pthread_mutex_init(&(c->ifmutex), NULL);
pthread_mutex_init(&(c->whilemutex), NULL);
pthread_mutex_init(&(c->staticmutex), NULL);
return c;
}
void freecompiler(COMPILER* c) {
pthread_mutex_destroy(&(c->ifmutex));
pthread_mutex_destroy(&(c->whilemutex));
pthread_mutex_destroy(&(c->staticmutex));
// to be continued
freeos(c->os);
freescope(c->globalscope);
free(c);
}

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#ifndef COMPILER_H
#define COMPILER_H
#include <pthread.h>
#include "parser-tree.h"
#include "vm-lines.h"
#include "compiler-scopes.h"
/* compiler
* This is the file that should be included in other modules
* that want to compile a class/program. */
struct scope;
typedef struct compiler {
pthread_mutex_t ifmutex;
pthread_mutex_t whilemutex;
pthread_mutex_t staticmutex;
CLASS* classes;
CLASS* os;
struct scope* globalscope;
} COMPILER;
COMPILER* mkcompiler(CLASS* classes);
LINEBLOCK* compileclass(COMPILER* c, CLASS* class);
void freecompiler(COMPILER* c);
#endif

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#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "threads.h"
#include "parser.h"
#include "compiler.h"
#include "io.h"
#include "os.h"
int main(int argc, char* argv[]) {
if(argc < 2) {
eprintf("Usage: %s {input file(s)}\n", argv[0]);
return 1;
}
FILELIST* files = getfiles(argv[1]);
FILELIST* curr = files->next;
COMPILEUNIT* head = (COMPILEUNIT*)malloc(sizeof(COMPILEUNIT));
head->file = files;
head->parser = mkparser(tokenize(files->fullname), files->name);
COMPILEUNIT* currunit = head;
while(curr != NULL) {
COMPILEUNIT* newunit = (COMPILEUNIT*)malloc(sizeof(COMPILEUNIT));
newunit->file = curr;
newunit->parser = mkparser(tokenize(curr->fullname), curr->name);
currunit->next = newunit;
currunit = newunit;
curr = curr->next;
}
currunit->next = NULL;
actonunits(head, parseunit);
CLASS* headclass = head->parsed;
CLASS* currclass = headclass;
currunit = head->next;
while(currunit != NULL) {
currclass->next = currunit->parsed;
currclass = currunit->parsed;
currunit = currunit->next;
}
currclass->next = NULL;
COMPILER* compiler = mkcompiler(headclass);
currunit = head;
while(currunit != NULL) {
currunit->compiler = compiler;
currunit = currunit->next;
}
actonunits(head, compileunit);
actonunits(head, vmtranslateunit);
currunit = head;
while(currunit != NULL) {
FILE* output = fopen(currunit->file->outname, "w");
if(output == NULL) {
eprintf("%s", strerror(errno));
exit(1);
}
printstrlist(currunit->asmlns, output);
fclose(output);
COMPILEUNIT* next = currunit->next;
freeunit(currunit);
currunit = next;
}
freecompiler(compiler);
freetree(headclass);
freefilelist(files);
return 0;
}

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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <dirent.h>
#include <stdbool.h>
#include <unistd.h>
#include "util.h"
#include "io.h"
#include <limits.h>
#ifndef PATH_MAX
#ifdef __linux__
#include <linux/limits.h>
#else
#define PATH_MAX 512
#endif
#endif
char* strtail(char* str, int len, int count) {
int index = len - count;
if (index <= 0) return str;
return str + (sizeof(char) * (index));
}
char* strhead(char* str, int count) {
return str + (sizeof(char) * count);
}
char* trimstr(char* str, int len, int end) {
int count = len - end;
char oldchar = str[count];
str[count] = '\0';
char* newstr = (char*)malloc(sizeof(char) * (1 + count));
strcpy(newstr, str);
str[count] = oldchar;
return newstr;
}
char* getname(char* f, int len) {
int startind = 0;
int endind = len - 1;
bool readsmt = false;
for(int i = endind; i >= 0; i--) {
if(f[i] == '/') {
if(!readsmt) {
endind = i-1;
f[i] = '\0';
continue;
}
startind = i+1;
break;
}
readsmt = true;
}
int sz = sizeof(char)*(endind - startind + 2);
char* startstr = strhead(f, startind);
char* retstr = (char*)malloc(sz);
snprintf(retstr, sz, "%s", startstr);
return retstr;
}
char* getfullname(char* fname, int fnamelen, char* dirname, int dirlen) {
int sz = sizeof(char)*(fnamelen+dirlen+2);
char* fullname = (char*)malloc(sz);
sprintf(fullname, "%s/%s", dirname, fname);
return fullname;
}
bool isdotjack(char* f, int len) {
const char* ext = ".jack";
return strcmp(strtail(f, len, strlen(ext)), ext) == 0;
}
bool isdir(char* f, int len) {
bool readsmt = false;
for(int i = len-1; i >= 0; i--) {
if(f[i] == '.') {
if(readsmt)
return false;
else
continue;
}
if(f[i] == '/')
return 1;
readsmt = true;
}
return true;
}
char* getoutname(char* fullname, int len) {
char* trimmed = trimstr(fullname, len, 4);
int sz = sizeof(char) * (len);
char* outname = (char*)malloc(sz);
snprintf(outname, sz, "%sasm", trimmed);
free(trimmed);
return outname;
}
FILELIST* addfile(FILELIST* l, char* fullname, char* name) {
FILELIST* new = (FILELIST*)malloc(sizeof(FILELIST));
new->name = name;
new->fullname = fullname;
new->next = l;
new->outname = getoutname(fullname, strlen(fullname));
return new;
}
FILELIST* getfilesfromdir(char* dir) {
FILELIST* filelist = NULL;
DIR* d = opendir(dir);
if(d == NULL) {
eprintf("Error while opening directory '%s': %s\n", dir, strerror(errno));
exit(errno);
}
int len = strlen(dir);
struct dirent* thisfile;
while(thisfile = readdir(d), thisfile != NULL) {
int thislen = strlen(thisfile->d_name);
if(isdotjack(thisfile->d_name, thislen)) {
char* fullname = getfullname(thisfile->d_name, thislen, dir, len);
char* name = ezheapstr(thisfile->d_name);
filelist = addfile(filelist, fullname, name);
}
}
closedir(d);
if(filelist == NULL) {
eprintf("Directory '%s' doesn't have any .jack file\n", dir);
exit(1);
}
return filelist;
}
FILELIST* getsinglefile(char* file) {
int len = strlen(file);
if(isdotjack(file, len)){
char* name = getname(file, len);
char* fullname = heapstr(file, len);
FILE* input = fopen(fullname, "r");
if(input == NULL) {
eprintf("Error while reading file '%s': %s\n", file, strerror(errno));
exit(errno);
}
fclose(input);
return addfile(NULL, fullname, name);
}
else {
eprintf("Input file must be named like 'Xxx.vm'\n");
exit(1);
}
}
FILELIST* getfiles(char* input) {
int inplen = strlen(input);
bool isitdir = isdir(input, inplen);
if(isitdir)
return getfilesfromdir(input);
else
return getsinglefile(input);
}
void freefilelist(FILELIST* fs) {
free(fs->name);
free(fs->fullname);
free(fs->outname);
FILELIST* next = fs->next;
free(fs);
if(next != NULL)
freefilelist(next);
}

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#ifndef IO_H
#define IO_H
typedef struct flist {
char* name;
char* fullname;
char* outname;
struct flist* next;
} FILELIST;
FILELIST* getfiles(char* input);
void freefilelist(FILELIST* fs);
#endif

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#include <stdlib.h>
#include <string.h>
#include "os.h"
#include "util.h"
CLASS* mkosclass(CLASS* os, const char* name) {
CLASS* c = (CLASS*)malloc(sizeof(CLASS));
c->name = ezheapstr(name);
c->subroutdecs = NULL;
c->next = os;
return c;
}
void adddec(CLASS* c, SUBROUTCLASS subroutclass, char* type, const char* name) {
SUBROUTDEC* dec = (SUBROUTDEC*)malloc(sizeof(SUBROUTDEC));
dec->class = c;
dec->subroutclass = subroutclass;
dec->name = ezheapstr(name);
dec->type = ezheapstr(type);
dec->next = c->subroutdecs;
c->subroutdecs = dec;
}
CLASS* mkmath(CLASS* os) {
CLASS* mathclass = mkosclass(os, "Math");
adddec(mathclass, function, "int", "multiply");
adddec(mathclass, function, "int", "divide");
adddec(mathclass, function, "int", "abs");
adddec(mathclass, function, "int", "min");
adddec(mathclass, function, "int", "max");
adddec(mathclass, function, "int", "sqrt");
return mathclass;
}
CLASS* mkstringclass(CLASS* os) {
CLASS* strclass = mkosclass(os, "String");
adddec(strclass, constructor, "String", "new");
adddec(strclass, method, "int", "dispose");
adddec(strclass, method, "int", "length");
adddec(strclass, method, "char", "charAt");
adddec(strclass, method, "void", "setCharAt");
adddec(strclass, method, "String", "appendChar");
adddec(strclass, method, "void", "eraseLastChar");
adddec(strclass, method, "int", "intValue");
adddec(strclass, method, "void", "setInt");
adddec(strclass, function, "char", "backSpace");
adddec(strclass, function, "char", "doubleQuote");
adddec(strclass, function, "char", "newLine");
return strclass;
}
CLASS* mkarray(CLASS* os) {
CLASS* arrclass = mkosclass(os, "Array");
adddec(arrclass, function, "Array", "new");
adddec(arrclass, method, "void", "dispose");
return arrclass;
}
CLASS* mkoutput(CLASS* os) {
CLASS* outclass = mkosclass(os, "Output");
adddec(outclass, function, "void", "moveCursor");
adddec(outclass, function, "void", "printChar");
adddec(outclass, function, "void", "printString");
adddec(outclass, function, "void", "printInt");
adddec(outclass, function, "void", "println");
adddec(outclass, function, "void", "backSpace");
return outclass;
}
CLASS* mkscreen(CLASS* os) {
CLASS* scrclass = mkosclass(os, "Screen");
adddec(scrclass, function, "void", "clearScreen");
adddec(scrclass, function, "void", "setColor");
adddec(scrclass, function, "void", "drawPixel");
adddec(scrclass, function, "void", "drawLine");
adddec(scrclass, function, "void", "drawRectangle");
adddec(scrclass, function, "void", "drawCircle");
return scrclass;
}
CLASS* mkkeyboard(CLASS* os) {
CLASS* kbdclass = mkosclass(os, "Keyboard");
adddec(kbdclass, function, "char", "keyPressed");
adddec(kbdclass, function, "char", "readChar");
adddec(kbdclass, function, "String", "readLine");
adddec(kbdclass, function, "int", "readInt");
return kbdclass;
}
CLASS* mkmemory(CLASS* os) {
CLASS* memclass = mkosclass(os, "Memory");
adddec(memclass, function, "int", "peek");
adddec(memclass, function, "void", "poke");
adddec(memclass, function, "Array", "alloc");
adddec(memclass, function, "void", "deAlloc");
return memclass;
}
CLASS* mksys(CLASS* os) {
CLASS* sysclass = mkosclass(os, "Sys");
adddec(sysclass, function, "void", "halt");
adddec(sysclass, function, "void", "error");
adddec(sysclass, function, "void", "wait");
return sysclass;
}
CLASS* mkos() {
CLASS* os = mkmath(NULL);
os = mkstringclass(os);
os = mkarray(os);
os = mkoutput(os);
os = mkscreen(os);
os = mkkeyboard(os);
os = mkmemory(os);
os = mksys(os);
return os;
}
void freeossubroutdecs(SUBROUTDEC* d) {
free(d->name);
free(d->type);
SUBROUTDEC* next = d->next;
free(d);
if(next != NULL)
freeossubroutdecs(next);
}
void freeosclasses(CLASS* c) {
freeossubroutdecs(c->subroutdecs);
free(c->name);
CLASS* next = c->next;
free(c);
if(next != NULL)
freeosclasses(next);
}
void freeos(CLASS* os) {
freeosclasses(os);
}
SUBROUTDEC* getsubroutdecinclass(CLASS* c, const char* name) {
SUBROUTDEC* curr = c->subroutdecs;
while(curr != NULL) {
if(!strcmp(curr->name, name))
return curr;
curr = curr->next;
}
return NULL;
}
CLASS* getosclass(CLASS* os, const char* name) {
CLASS* curr = os;
while(curr != NULL) {
if(!strcmp(curr->name, name))
return curr;
curr = curr->next;
}
return NULL;
}
SUBROUTDEC* getossubroutdec(CLASS* os, SUBROUTCALL* call) {
CLASS* c = getosclass(os, call->parentname);
if(c == NULL)
return NULL;
return getsubroutdecinclass(c, call->name);
}

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#ifndef OS_H
#define OS_H
#include "parser-tree.h"
SUBROUTDEC* getossubroutdec(CLASS* os, SUBROUTCALL* call);
CLASS* getosclass(CLASS* os, const char* name);
CLASS* mkos();
void freeos(CLASS* os);
#endif

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#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "threads.h"
void* parseunit(void* input) {
COMPILEUNIT* unit = (COMPILEUNIT*)input;
unit->parsed = parse(unit->parser);
pthread_exit(NULL);
}
void* compileunit(void* input) {
COMPILEUNIT* unit = (COMPILEUNIT*)input;
unit->compiled = compileclass(unit->compiler, unit->parsed);
pthread_exit(NULL);
}
char* getclassname(char* filename) {
int count = 0;
int len = strlen(filename);
for(int i = len-1; i >= 0; i--)
if(filename[i] == '.') {
count = i;
break;
}
int sz = sizeof(char) * (len - count);
char* classname = (char*)malloc(sz);
snprintf(classname, sz, "%s", filename); // legitimately needs to be snprintf
return classname;
}
void* vmtranslateunit(void* input) {
COMPILEUNIT* unit = (COMPILEUNIT*)input;
if(unit->compiled == NULL) {
eprintf("Class '%s' is empty; file '%s'\n", unit->parsed->name, unit->file->name);
exit(1);
}
char* classname = getclassname(unit->file->name);
unit->vmtranslator = mkvmtranslator(classname, unit->compiled);
unit->asmlns = translatevm(unit->vmtranslator);
free(classname);
pthread_exit(NULL);
}
void waitthreads(pthread_t* threads, int amount) {
void* status;
int code;
for(int i = 0; i < amount; i++) {
code = pthread_join(threads[i], &status);
if(code) {
eprintf("Error while joining thread %i: %s\n", i, strerror(code));
exit(code);
}
}
}
void actonunits(COMPILEUNIT* units, void*(*fun)(void*)) {
pthread_t mythreads[_SC_THREAD_THREADS_MAX];
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
COMPILEUNIT* curr = units;
int i;
int code;
do {
i = 0;
while(curr != NULL && i < _SC_THREAD_THREADS_MAX) {
code = pthread_create(&mythreads[i], &attr, fun, curr);
if(code) {
eprintf("Error while creating thread %i: %s\n", i, strerror(code));
exit(code);
}
curr = curr->next;
i++;
}
waitthreads(mythreads, i);
} while(i == _SC_THREAD_THREADS_MAX);
pthread_attr_destroy(&attr);
}
void freeunit(COMPILEUNIT* u) {
freeparser(u->parser);
freelnblk(u->compiled);
freestrlist(u->asmlns);
freevmtranslator(u->vmtranslator);
free(u);
}

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#ifndef THREADS_H
#define THREADS_H
#include <pthread.h>
#include "parser.h"
#include "compiler.h"
#include "io.h"
#include "vm-translator.h"
/* threads
* Tools for dealing with the compiling pipeline in a parallel way */
typedef struct unit {
FILELIST* file;
PARSER* parser;
CLASS* parsed;
COMPILER* compiler;
STRINGLIST* asmlns;
LINEBLOCK* compiled;
VMTRANSLATOR* vmtranslator;
struct unit* next;
} COMPILEUNIT;
void* parseunit(void* input);
void* compileunit(void* input);
void* vmtranslateunit(void* input);
void waitthreads(pthread_t* threads, int amount);
void actonunits(COMPILEUNIT* units, void*(*fun)(void*));
void freeunit(COMPILEUNIT* u);
#endif

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#include <string.h>
#include <stdlib.h>
#include "util.h"
char* heapstr(const char* str, int len) {
int size = sizeof(char) * (len + 1);
char* outstr = (char*)malloc(size);
strcpy(outstr, str);
return outstr;
}
char* ezheapstr(const char* str) {
return heapstr(str, strlen(str));
}
void* copy(void* v, int size) {
void* copy = malloc(size);
memcpy(copy, v, size);
return copy;
}
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;
}
char* itoa(int i) {
int size = sizeof(char)*(countplaces(i)+1);
char* a = (char*)malloc(size);
sprintf(a, "%i", i);
return a;
}
char* dotlabel(char* n1, char* n2) {
int sz = (strlen(n1) + strlen(n2) + 2) * sizeof(char);
char* result = (char*)malloc(sz);
sprintf(result, "%s.%s", n1, n2);
return result;
}
STRINGLIST* onestr(const char* str) {
STRINGLIST* strlist = (STRINGLIST*)malloc(sizeof(STRINGLIST));
strlist->content = ezheapstr(str);
strlist->next = NULL;
return strlist;
}
STRINGLIST* initstrlist(const char** strs, int count) {
STRINGLIST* strlist = (STRINGLIST*)malloc(sizeof(STRINGLIST));
STRINGLIST* curr = strlist;
for(int i = 0; i < count-1; i++) {
curr->content = ezheapstr(strs[i]);
curr->next = (STRINGLIST*)malloc(sizeof(STRINGLIST));
curr = curr->next;
}
curr->content = ezheapstr(strs[count-1]);
curr->next = NULL;
return strlist;
}
void printstrlist(STRINGLIST* strlist, FILE* stream) {
while(strlist != NULL) {
fprintf(stream, "%s\n", strlist->content);
strlist = strlist->next;
}
}
void freestrlist(STRINGLIST* strlist) {
STRINGLIST* next = strlist->next;
free(strlist);
if(next != NULL)
freestrlist(next);
}
bool existsinarray(STRINGARRAY* arr, const char* item) {
for(int i = 0; i < arr->size; i++)
if(!strcmp(arr->items[i], item))
return true;
return false;
}

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#ifndef UTIL_H
#define UTIL_H
#include <stdio.h>
#include <stdbool.h>
/* util
* Random utilities. */
// Macros
#define eprintf(...) fprintf (stderr, __VA_ARGS__)
#define count(array, type) ((sizeof(array)) / (sizeof(type)))
#define strcount(array) count(array, char*)
#define mkstrlist(name, array) STRINGARRAY name = { .items = array, .size = strcount(array) }
typedef struct stringlist {
char* content;
struct stringlist* next;
} STRINGLIST;
typedef struct {
const char** items;
const int size;
} STRINGARRAY;
char* heapstr(const char* str, int len);
char* ezheapstr(const char* str);
int countplaces(int n);
char* itoa(int i);
void* copy(void* v, int size);
char* dotlabel(char* n1, char* n2);
STRINGLIST* onestr(const char* str);
STRINGLIST* initstrlist(const char** strs, int count);
void printstrlist(STRINGLIST* strlist, FILE* stream);
void freestrlist(STRINGLIST* strlist);
bool existsinarray(STRINGARRAY* arr, const char* item);
#endif

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#include <stdlib.h>
#include "util.h"
#include "parser-util.h"
#include "parser-expressions.h"
const char* keywordsarr[] = { "true", "false", "null", "this" };
const char* opsarr[] = { "+", "-", "*", "/", "&", "|", "<", ">", "=" };
mkstrlist(keywordconstants, keywordsarr);
mkstrlist(operators, opsarr);
/* BEGIN FORWARD DECLARATIONS */
// Miscelaneous
bool isop(TOKEN* t);
// Parsing methods
TERM* parsetermnullified(PARSER* p);
TERM* parseterm(PARSER* p);
TERM* mkterm(TERMTYPE type);
TERM* parseint(PARSER* p);
TERM* parsestr(PARSER* p);
TERM* parsekeyword(PARSER* p);
TERM* parseunaryopterm(PARSER* p);
TERM* parseinnerexpression(PARSER* p);
TERM* parsecalltermnullified(PARSER* p);
TERM* parsearrayterm(PARSER* p);
TERM* parsevarterm(PARSER* p);
TERM* parseidentifierterm(PARSER* p);
SUBROUTCALL* nullsubroutcall(PARSER* p, SUBROUTCALL* c);
SUBROUTCALL* parsesubroutcallnullified(PARSER* p);
/* END FORWARD DECLARATIONS */
// Miscelaneous
bool isop(TOKEN* t) {
for(int i = 0; i < operators.size; i++)
if(!strcmp(t->token, operators.items[i]))
return true;
return false;
}
// Parsing methods
TERM* parsetermnullified(PARSER* p) {
TOKENTYPE type = p->current->type;
if(type == integer) return parseint(p);
if(type == string) return parsestr(p);
if(type == keyword) return parsekeyword(p);
if(type == identifier) return parseidentifierterm(p);
if(equals(p, "-") || equals(p, "~")) return parseunaryopterm(p);
if(equals(p, "(")) return parseinnerexpression(p);
return NULL;
}
TERM* parseterm(PARSER* p) {
TERM* t = parsetermnullified(p);
if(t == NULL)
unexpected(p);
return t;
}
TERM* mkterm(TERMTYPE type) {
TERM* t = (TERM*)malloc(sizeof(TERM));
t->type = type;
return t;
}
TERM* parseint(PARSER* p) {
TERM* t = mkterm(intconstant);
t->integer = atoi(p->current->token);
next(p);
return t;
}
TERM* parsestr(PARSER* p) {
TERM* t = mkterm(stringconstant);
t->string = p->current->token;
next(p);
return t;
}
TERM* parsekeyword(PARSER* p) {
TERM* t = mkterm(keywordconstant);
if(!existsinarray(&keywordconstants, p->current->token))
unexpected(p);
t->string = p->current->token;
next(p);
return t;
}
TERM* parseunaryopterm(PARSER* p) {
TERM* t = mkterm(unaryopterm);
t->unaryop = p->current->token[0];
next(p);
t->expression = parseterm(p);
t->expression->next = NULL;
return t;
}
TERM* parseinnerexpression(PARSER* p) {
TERM* t = mkterm(innerexpression);
next(p);
t->expression = parseexpression(p);
checkcontent(p, ")");
return t;
}
TERM* parsecalltermnullified(PARSER* p) {
SUBROUTCALL* call = parsesubroutcallnullified(p);
if(call == NULL)
return NULL;
TERM* t = mkterm(subroutcall);
t->call = call;
return t;
}
TERM* parsearrayterm(PARSER* p) {
TERM* t = mkterm(arrayitem);
t->array = (ARRAY*)malloc(sizeof(ARRAY));
t->array->name = p->current->token;
next(p);
checkcontent(p, "[");
t->array->exp = parseexpression(p);
checkcontent(p, "]");
return t;
}
TERM* parsevarterm(PARSER* p) {
TERM* t = mkterm(varname);
t->string = p->current->token;
next(p);
return t;
}
TERM* parseidentifierterm(PARSER* p) {
TERM* t = parsecalltermnullified(p);
if(t == NULL)
if(nextequals(p, "["))
return parsearrayterm(p);
else
return parsevarterm(p);
else
return t;
}
TERM* parseexpressionnullified(PARSER* p) {
TERM* head = parsetermnullified(p);
TERM* current = head;
TERM* nextt;
while(isop(p->current)) {
current->op = p->current->token[0];
next(p);
nextt = parseterm(p);
current->next = nextt;
current = nextt;
}
if(current != NULL)
current->next = NULL;
return head;
}
TERM* parseexpression(PARSER* p) {
TERM* t = parseexpressionnullified(p);
if(t == NULL)
unexpected(p);
return t;
}
SUBROUTCALL* nullsubroutcall(PARSER* p, SUBROUTCALL* c) {
free(c->debug);
free(c);
rewindparser(p);
return NULL;
}
SUBROUTCALL* parsesubroutcallnullified(PARSER* p) {
if(p->current->type != identifier)
return NULL;
anchorparser(p);
SUBROUTCALL* c = (SUBROUTCALL*)malloc(sizeof(SUBROUTCALL));
c->debug = getdebug(p);
if(nextequals(p, ".")) {
c->parentname = p->current->token;
next(p);
next(p);
}
else
c->parentname = NULL;
if(p->current->type != identifier)
return nullsubroutcall(p, c);
c->name = p->current->token;
next(p);
if(differs(p, "("))
return nullsubroutcall(p, c);
next(p);
c->parameters = parseexpressionlist(p);
if(differs(p, ")"))
return nullsubroutcall(p, c);
next(p);
return c;
}
SUBROUTCALL* parsesubroutcall(PARSER* p) {
SUBROUTCALL* c = (SUBROUTCALL*)malloc(sizeof(SUBROUTCALL));
c->debug = getdebug(p);
if(nextequals(p, ".")) {
c->parentname = parseidentifier(p);
next(p);
}
else
c->parentname = NULL;
c->name = parseidentifier(p);
checkcontent(p, "(");
c->parameters = parseexpressionlist(p);
checkcontent(p, ")");
return c;
}
EXPRESSIONLIST* parseexpressionlist(PARSER* p) {
if(!strcmp(p->current->token, ")"))
return NULL;
EXPRESSIONLIST* head = (EXPRESSIONLIST*)malloc(sizeof(EXPRESSIONLIST));
head->expression = parseexpressionnullified(p);
EXPRESSIONLIST* current = head;
EXPRESSIONLIST* nextls;
while(!strcmp(p->current->token, ",")) {
next(p);
nextls = (EXPRESSIONLIST*)malloc(sizeof(EXPRESSIONLIST));
nextls->expression = parseexpression(p);
current->next = nextls;
current = nextls;
}
if(current != NULL)
current->next = NULL;
return head;
}

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#ifndef PARSER_EXPRESSIONS_H
#define PARSER_EXPRESSIONS_H
#include "parser.h"
/* parser-expressions
* Functions for parsing expressions. */
TERM* parseexpressionnullified(PARSER* p);
TERM* parseexpression(PARSER* p);
SUBROUTCALL* parsesubroutcall(PARSER* p);
EXPRESSIONLIST* parseexpressionlist(PARSER* p);
#endif

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#include <stdlib.h>
#include "parser-expressions.h"
#include "parser-util.h"
#include "parser-statements.h"
/* BEGIN FORWARD DECLARATIONS */
// Miscelaneous
STATEMENT* mkstatement(PARSER* p, STATEMENTTYPE t);
STATEMENT* parsestatementnullified(PARSER* p);
STATEMENT* parselet(PARSER* p);
CONDSTATEMENT* parsecond(PARSER* p);
STATEMENT* parseif(PARSER* p);
STATEMENT* parsewhile(PARSER* p);
STATEMENT* parsedo(PARSER* p);
STATEMENT* parsereturn(PARSER* p);
/* END FORWARD DECLARATIONS */
// Miscelaneous
STATEMENT* mkstatement(PARSER* p, STATEMENTTYPE t) {
STATEMENT* s = (STATEMENT*)malloc(sizeof(STATEMENT));
s->type = t;
s->debug = getdebug(p);
return s;
}
// Parsing methods
// Though nullified, will throw errors if the parsing fails while on-going
STATEMENT* parsestatementnullified(PARSER* p) {
if(equals(p, "let")) return parselet(p);
if(equals(p, "if")) return parseif(p);
if(equals(p, "while")) return parsewhile(p);
if(equals(p, "do")) return parsedo(p);
if(equals(p, "return")) return parsereturn(p);
return NULL;
}
STATEMENT* parsestatements(PARSER* p) {
STATEMENT* head = parsestatementnullified(p);
STATEMENT* curr = head;
STATEMENT* next;
while(next = parsestatementnullified(p), next != NULL) {
curr->next = next;
curr = next;
}
if(curr != NULL)
curr->next = NULL;
return head;
}
STATEMENT* parselet(PARSER* p) {
next(p);
STATEMENT* s = mkstatement(p, letstatement);
LETSTATEMENT* letst = (LETSTATEMENT*)malloc(sizeof(LETSTATEMENT));
letst->varname = parseidentifier(p);
if(equals(p, "[")) {
next(p);
letst->arrayind = parseexpression(p);
checkcontent(p, "]");
}
else
letst->arrayind = NULL;
checkcontent(p, "=");
letst->expression = parseexpression(p);
checkcontent(p, ";");
s->type = letstatement;
s->letstatement = letst;
return s;
}
CONDSTATEMENT* parsecond(PARSER* p) {
checkcontent(p, "(");
CONDSTATEMENT* st = (CONDSTATEMENT*)malloc(sizeof(CONDSTATEMENT));
st->expression = parseexpression(p);
checkcontent(p, ")");
checkcontent(p, "{");
st->statements = parsestatements(p);
checkcontent(p, "}");
return st;
}
STATEMENT* parseif(PARSER* p) {
next(p);
STATEMENT* s = mkstatement(p, ifstatement);
IFSTATEMENT* ifst = (IFSTATEMENT*)malloc(sizeof(IFSTATEMENT));
ifst->base = parsecond(p);
if(equals(p, "else")) {
next(p);
checkcontent(p, "{");
ifst->elsestatements = parsestatements(p);
checkcontent(p, "}");
}
else
ifst->elsestatements = NULL;
s->type = ifstatement;
s->ifstatement = ifst;
return s;
}
STATEMENT* parsewhile(PARSER* p) {
next(p);
STATEMENT* s = mkstatement(p, whilestatement);
s->whilestatement = parsecond(p);
return s;
}
STATEMENT* parsedo(PARSER* p) {
next(p);
STATEMENT* s = mkstatement(p, dostatement);
s->dostatement = parsesubroutcall(p);
checkcontent(p, ";");
return s;
}
STATEMENT* parsereturn(PARSER* p) {
next(p);
STATEMENT* s = mkstatement(p, returnstatement);
s->retstatement = parseexpressionnullified(p);
checkcontent(p, ";");
return s;
}

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#ifndef PARSER_STATEMENTS_H
#define PARSER_STATEMENTS_H
#include "parser.h"
/* parser-statements
* Function for parsing statements. */
STATEMENT* parsestatements(PARSER* p);
#endif

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#include <stdlib.h>
#include "parser-util.h"
#include "parser-structure.h"
#include "parser-statements.h"
const char* classvartypesarr[] = { "static", "field" };
const char* vartypesarr[] = { "int", "char", "boolean" };
const char* subroutclassesarr[] = { "constructor", "function", "method" };
mkstrlist(classvartypes, classvartypesarr);
mkstrlist(vartypes, vartypesarr);
mkstrlist(subroutclasses, subroutclassesarr);
/* BEGIN FORWARD DECLARATIONS */
// Miscelaneous
bool isprimitive(TOKEN* tk);
char* parsetype(PARSER* p);
int parsepossibilities(PARSER* p, STRINGARRAY* poss);
// Parsing methods
CLASS* parseclass(PARSER* p);
CLASSVARTYPE parseclassvartype(PARSER* p);
CLASSVARDEC* parseclassvardec(PARSER* p);
CLASSVARDEC* parseclassvardecs(PARSER* p);
SUBROUTCLASS parsesubroutclass(PARSER* p);
SUBROUTDEC* parsesubroutdec(PARSER* p, CLASS* c);
SUBROUTDEC* parsesubroutdecs(PARSER* p, CLASS* c);
PARAMETER* parseparameter(PARSER* p);
PARAMETER* parseparameters(PARSER* p);
SUBROUTBODY* parsesubroutbody(PARSER* p);
void parsevardeccommon(PARSER* p, VARDEC* v);
VARDEC* parsevardec(PARSER* p);
VARDEC* parsevardecs(PARSER* p);
/* END FORWARD DECLARATIONS */
// Miscelaneous
bool isprimitive(TOKEN* tk) {
if(tk->type == keyword)
if(existsinarray(&vartypes, tk->token))
return true;
return false;
}
char* parsetype(PARSER* p) {
if(p->current->type != identifier && p->current->type != keyword)
unexpected(p);
char* result = p->current->token;
next(p);
return result;
}
int parsepossibilities(PARSER* p, STRINGARRAY* poss) {
for(int i = 0; i < poss->size; i++)
if(equals(p, poss->items[i]))
return i;
return -1;
}
// Parsing methods
CLASS* parseclass(PARSER* p) {
checkcontent(p, "class");
CLASS* class = (CLASS*)malloc(sizeof(CLASS));
class->debug = getdebug(p);
class->name = parseidentifier(p);
checkcontent(p, "{");
class->vardecs = parseclassvardecs(p);
class->subroutdecs = parsesubroutdecs(p, class);
checkcontent(p, "}");
if(p->current != NULL)
unexpected(p);
return class;
}
CLASSVARTYPE parseclassvartype(PARSER* p) {
return parsepossibilities(p, &classvartypes);
}
CLASSVARDEC* parseclassvardec(PARSER* p) {
CLASSVARTYPE classvartype = parseclassvartype(p);
if(classvartype == -1)
return NULL;
next(p);
CLASSVARDEC* classvardec = (CLASSVARDEC*)malloc(sizeof(CLASSVARDEC));
classvardec->type = classvartype;
classvardec->base = (VARDEC*)malloc(sizeof(VARDEC));
parsevardeccommon(p, classvardec->base);
return classvardec;
}
CLASSVARDEC* parseclassvardecs(PARSER* p) {
CLASSVARDEC* head = parseclassvardec(p);
CLASSVARDEC* curr = head;
CLASSVARDEC* nextc;
while(nextc = parseclassvardec(p), nextc != NULL) {
curr->next = nextc;
curr = nextc;
}
if(curr != NULL)
curr->next = NULL;
return head;
}
SUBROUTCLASS parsesubroutclass(PARSER* p) {
return parsepossibilities(p, &subroutclasses);
}
SUBROUTDEC* parsesubroutdec(PARSER* p, CLASS* c) {
SUBROUTCLASS subroutclass = parsesubroutclass(p);
if(subroutclass == -1)
return NULL;
next(p);
SUBROUTDEC* subroutdec = (SUBROUTDEC*)malloc(sizeof(SUBROUTDEC));
subroutdec->subroutclass = subroutclass;
if(differs(p, "void"))
subroutdec->type = parsetype(p);
else {
subroutdec->type = p->current->token;
next(p);
}
subroutdec->debug = getdebug(p);
subroutdec->name = parseidentifier(p);
checkcontent(p, "(");
subroutdec->parameters = parseparameters(p);
checkcontent(p, ")");
checkcontent(p, "{");
subroutdec->body = parsesubroutbody(p);
checkcontent(p, "}");
subroutdec->class = c;
return subroutdec;
}
SUBROUTDEC* parsesubroutdecs(PARSER* p, CLASS* c) {
SUBROUTDEC* head = parsesubroutdec(p, c);
SUBROUTDEC* curr = head;
SUBROUTDEC* nexts;
while(nexts = parsesubroutdec(p, c), nexts != NULL) {
curr->next = nexts;
curr = nexts;
}
if(curr != NULL)
curr->next = NULL;
return head;
}
PARAMETER* parseparameter(PARSER* p) {
if(equals(p, ")"))
return NULL;
PARAMETER* param = (PARAMETER*)malloc(sizeof(PARAMETER));
param->debug = getdebug(p);
param->primitive = isprimitive(p->current);
param->type = parsetype(p);
param->name = parseidentifier(p);
return param;
}
PARAMETER* parseparameters(PARSER* p) {
PARAMETER* head = parseparameter(p);
PARAMETER* curr = head;
PARAMETER* nextp;
while(equals(p, ",")) {
next(p);
nextp = parseparameter(p);
if(nextp == NULL)
unexpected(p);
curr->next = nextp;
curr = curr->next;
}
if(curr != NULL)
curr->next = NULL;
return head;
}
SUBROUTBODY* parsesubroutbody(PARSER* p) {
SUBROUTBODY* subroutbody = (SUBROUTBODY*)malloc(sizeof(SUBROUTBODY));
subroutbody->vardecs = parsevardecs(p);
subroutbody->statements = parsestatements(p);
return subroutbody;
}
void parsevardeccommon(PARSER* p, VARDEC* v) {
v->typeclass = p->current->type;
v->primitive = isprimitive(p->current);
v->type = parsetype(p);
STRINGLIST* currstr = (STRINGLIST*)malloc(sizeof(STRINGLIST));
v->names = currstr;
v->debug = getdebug(p);
v->names->content = parseidentifier(p);
while(!strcmp(p->current->token, ",")) {
next(p);
STRINGLIST* nextstr = (STRINGLIST*)malloc(sizeof(STRINGLIST));
nextstr->content = parseidentifier(p);
currstr->next = nextstr;
currstr = nextstr;
}
currstr->next = NULL;
checkcontent(p, ";");
}
VARDEC* parsevardec(PARSER* p) {
if(strcmp(p->current->token, "var"))
return NULL;
next(p);
VARDEC* vardec = (VARDEC*)malloc(sizeof(VARDEC));
parsevardeccommon(p, vardec);
return vardec;
}
VARDEC* parsevardecs(PARSER* p) {
VARDEC* head = parsevardec(p);
VARDEC* curr = head;
VARDEC* nextv;
while(nextv = parsevardec(p), nextv != NULL) {
curr->next = nextv;
curr = nextv;
}
if(curr != NULL)
curr->next = NULL;
return head;
}

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#ifndef PARSER_STRUCTURE_H
#define PARSER_STRUCTURE_H
#include "parser.h"
/* parser-structure
* Function for parsing a class. */
CLASS* parseclass(PARSER* p);
#endif

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#include <stdlib.h>
#include "parser-tree.h"
void freeexpression(TERM* e);
void freeexpressionlist(EXPRESSIONLIST* el);
void freestatements(STATEMENT* s);
void freevardec(VARDEC* v) {
freestrlist(v->names);
free(v->debug);
free(v);
}
void freevardecs(VARDEC* v) {
VARDEC* next = v->next;
freevardec(v);
if(next != NULL)
freevardecs(next);
}
void freeparameters(PARAMETER* p) {
free(p->debug);
PARAMETER* next = p->next;
free(p);
if(next != NULL)
freeparameters(next);
}
void freearray(ARRAY* a) {
freeexpression(a->exp);
free(a);
}
void freesubroutcall(SUBROUTCALL* call) {
if(call->parameters != NULL)
freeexpressionlist(call->parameters);
free(call->debug);
free(call);
}
void freeexpression(TERM* e) {
if(e->type == arrayitem)
freearray(e->array);
else if(e->type == innerexpression || e->type == unaryopterm)
freeexpression(e->expression);
else if(e->type == subroutcall)
freesubroutcall(e->call);
TERM* next = e->next;
free(e);
if(next != NULL)
freeexpression(next);
}
void freeexpressionlist(EXPRESSIONLIST* el) {
freeexpression(el->expression);
EXPRESSIONLIST* next = el->next;
free(el);
if(next != NULL)
freeexpressionlist(next);
}
void freelet(LETSTATEMENT* l) {
if(l->arrayind != NULL)
freeexpression(l->arrayind);
freeexpression(l->expression);
free(l);
}
void freecond(CONDSTATEMENT* cond) {
freeexpression(cond->expression);
if(cond->statements != NULL)
freestatements(cond->statements);
free(cond);
}
void freeif(IFSTATEMENT* st) {
freecond(st->base);
if(st->elsestatements != NULL)
freestatements(st->elsestatements);
free(st);
}
void freestatements(STATEMENT* s) {
if(s->type == letstatement)
freelet(s->letstatement);
else if(s->type == ifstatement)
freeif(s->ifstatement);
else if(s->type == whilestatement)
freecond(s->whilestatement);
else if(s->type == dostatement)
freesubroutcall(s->dostatement);
else if(s->retstatement != NULL)
freeexpression(s->retstatement);
free(s->debug);
STATEMENT* next = s->next;
free(s);
if(next != NULL)
freestatements(next);
}
void freesubroutbody(SUBROUTBODY* b) {
if(b->vardecs != NULL)
freevardecs(b->vardecs);
if(b->statements != NULL)
freestatements(b->statements);
free(b);
}
void freesubroutdecs(SUBROUTDEC* sr) {
free(sr->debug);
if(sr->parameters != NULL)
freeparameters(sr->parameters);
freesubroutbody(sr->body);
SUBROUTDEC* next = sr->next;
free(sr);
if(next != NULL)
freesubroutdecs(next);
}
void freeclassvardecs(CLASSVARDEC* cvd) {
freevardec(cvd->base);
CLASSVARDEC* next = cvd->next;
free(cvd);
if(next != NULL)
freeclassvardecs(next);
}
void freetree(CLASS* c) {
free(c->debug);
if(c->vardecs != NULL)
freeclassvardecs(c->vardecs);
if(c->subroutdecs != NULL)
freesubroutdecs(c->subroutdecs);
CLASS* next = c->next;
free(c);
if(next != NULL)
freetree(next);
}

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#ifndef PARSER_TREE_H
#define PARSER_TREE_H
#include <stdbool.h>
#include "tokenizer.h"
#include "util.h"
/* parser-tree
* Type definitions for the parsing tree. */
/* BEGIN FORWARD DECLARATIONS */
struct classvardec;
struct parameter;
struct subroutbody;
struct subroutdec;
struct vardec;
struct letstatement;
struct ifstatement;
struct condstatement;
struct subroutcall;
struct term;
struct expressionlist;
/* END FORWARD DECLARATIONS */
// Misc
typedef struct {
char* file;
int definedat;
} DEBUGINFO;
// Program structure
typedef struct class {
char* name;
struct classvardec* vardecs;
struct subroutdec* subroutdecs;
DEBUGINFO* debug;
struct class* next;
} CLASS;
typedef enum {
stat, field
} CLASSVARTYPE;
typedef struct classvardec {
CLASSVARTYPE type;
struct vardec* base;
struct classvardec* next;
} CLASSVARDEC;
typedef enum {
constructor, function, method
} SUBROUTCLASS;
typedef struct subroutdec {
SUBROUTCLASS subroutclass;
CLASS* class;
char* type;
char* name;
struct parameter* parameters;
struct subroutbody* body;
DEBUGINFO* debug;
struct subroutdec* next;
} SUBROUTDEC;
typedef struct parameter {
char* type;
char* name;
bool primitive;
DEBUGINFO* debug;
struct parameter* next;
} PARAMETER;
typedef struct subroutbody {
struct vardec* vardecs;
struct statement* statements;
} SUBROUTBODY;
typedef struct vardec {
char* type;
bool primitive;
TOKENTYPE typeclass;
STRINGLIST* names;
DEBUGINFO* debug;
struct vardec* next;
} VARDEC;
// Statements
typedef enum {
ifstatement, whilestatement, letstatement, dostatement, returnstatement
} STATEMENTTYPE;
typedef struct statement {
STATEMENTTYPE type;
union {
struct letstatement* letstatement;
struct ifstatement* ifstatement;
struct condstatement* whilestatement;
struct subroutcall* dostatement;
struct term* retstatement;
};
DEBUGINFO* debug;
struct statement* next;
} STATEMENT;
typedef struct letstatement {
char* varname;
struct term* arrayind;
struct term* expression;
} LETSTATEMENT;
typedef struct ifstatement {
struct condstatement* base;
struct statement* elsestatements;
} IFSTATEMENT;
typedef struct condstatement {
struct term* expression;
struct statement* statements;
} CONDSTATEMENT;
// Expressions
typedef enum {
varname, intconstant, stringconstant, keywordconstant, arrayitem, subroutcall, innerexpression, unaryopterm
} TERMTYPE;
typedef struct {
char* name;
struct term* exp;
} ARRAY;
typedef struct term {
TERMTYPE type;
union {
char* string;
int integer;
struct subroutcall* call;
struct term* expression;
ARRAY* array;
};
char op;
char unaryop;
struct term* next;
} TERM;
typedef struct subroutcall {
char* parentname;
char* name;
struct expressionlist* parameters;
DEBUGINFO* debug;
} SUBROUTCALL;
typedef struct expressionlist {
TERM* expression;
struct expressionlist* next;
} EXPRESSIONLIST;
void freetree(CLASS* c);
#endif

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#include <stdlib.h>
#include "parser-util.h"
#include "util.h"
const char* tokentypesarr[] = { "keyword", "identifier", "symbol",
"integerConstant", "stringConstant" };
mkstrlist(tokentypes, tokentypesarr);
void unexpected(PARSER* p) {
eprintf("Unexpected token '%s' (of type %s); line %i, file '%s'\n",
p->current->token, tokentypes.items[p->current->type],
p->current->definedat, p->file);
exit(1);
}
void checktype(PARSER* p, TOKENTYPE type) {
if(p->current->type != type) {
eprintf("Unexpected %s; file '%s', line %i\n",
tokentypes.items[p->current->type], p->file,
p->current->definedat);
exit(1);
}
}
void checkcontent(PARSER* p, const char* content) {
if(differs(p, content))
unexpected(p);
next(p);
}
char* parseidentifier(PARSER* p) {
checktype(p, identifier);
char* result = p->current->token;
next(p);
return result;
}
DEBUGINFO* getdebug(PARSER* p) {
DEBUGINFO* d = (DEBUGINFO*)malloc(sizeof(DEBUGINFO));
d->file = p->file;
d->definedat = p->current->definedat;
return d;
}

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#ifndef PARSER_INTERNAL_H
#define PARSER_INTERNAL_H
#include <string.h>
#include "parser.h"
/* parser-util
* Random utilities used in the parser module. */
#define next(parser) parser->current = p->current->next
#define anchorparser(parser) p->checkpoint = p->current
#define rewindparser(parser) p->current = p->checkpoint
#define differs(parser, str) strcmp(parser->current->token, str)
#define nextdiffers(parser, str) strcmp(parser->current->next->token, str)
#define equals(parser, str) !differs(parser, str)
#define nextequals(parser, str) !nextdiffers(parser, str)
void unexpected(PARSER* p);
char* parseidentifier(PARSER* p);
void checkcontent(PARSER* p, const char* content);
DEBUGINFO* getdebug(PARSER* p);
#endif

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include "parser.h"
#include "parser-structure.h"
PARSER* mkparser(TOKEN* t, char* file) {
PARSER* parser = (PARSER*)malloc(sizeof(PARSER));
parser->tokens = t;
parser->current = t;
parser->file = file;
return parser;
}
CLASS* parse(PARSER* p) {
return parseclass(p);
}
void freeparser(PARSER* p) {
freetokens(p->tokens);
free(p);
}

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#ifndef PARSER_H
#define PARSER_H
#include "tokenizer.h"
#include "parser-tree.h"
/* parser
* This is the file that should be included in other modules
* that want to parse a file. */
typedef struct {
TOKEN* tokens;
TOKEN* current;
TOKEN* checkpoint;
char* file;
} PARSER;
PARSER* mkparser(TOKEN* t, char* file);
CLASS* parse(PARSER* p);
void freeparser(PARSER* p);
#endif

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#ifndef TOKENIZER_TABLES_H
#define TOKENIZER_TABLES_H
#include "util.h"
const char* keywordsraw[] = {
"class", "constructor", "function", "method", "field", "static",
"var", "int", "char", "boolean", "void", "true", "false", "null",
"this", "let", "do", "if", "else", "while", "return"
};
mkstrlist(keywords, keywordsraw);
const char* symbolsraw[] = {
"{", "}", "(", ")", "[", "]", ".", ",", ";", "+", "-", "*", "/",
"&", "|", "<", ">", "=", "~"
};
mkstrlist(symbols, symbolsraw);
#endif

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#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include "tokenizer.h"
#include "tokenizer-tables.h"
// Data types
typedef enum {
common, charsymbol, space
} CHARTYPE;
typedef struct {
char* str;
int size;
int count;
} STRING;
// String manipulation
STRING* mkstring(int size);
void append(STRING* s, char c);
void freestr(STRING* str);
// Token manipulation;
TOKEN* appendtokenraw(TOKEN* curitem, STRING* token, int definedat, TOKENTYPE type);
TOKEN* appendtoken(TOKEN* curitem, STRING* token, char* file, int definedat);
#define mktoken() (TOKEN*)malloc(sizeof(TOKEN))
// Char types
CHARTYPE getchartype(unsigned char c);
bool iskeyword(STRING* tk);
bool issymbol(STRING* tk);
bool isint(char* str);
bool isintcons(STRING* tk);
bool isidentifier(STRING* tk);
TOKENTYPE gettokentype(STRING* tk, char* file, int definedat);
// Stream handling
void skipln(FILE* input);
void skipmultiln(FILE* input, int* lnscount);
bool handlecomment(FILE* input, int* lnscount);
void readstr(FILE* input, STRING* tmp, int definedat);
// String manipulation
STRING* mkstring(int size) {
STRING* str = (STRING*)malloc(sizeof(STRING));
str->size = sizeof(char) * size; // initial size
str->str = (char*)malloc(str->size);
str->count = 0;
return str;
}
void append(STRING* s, char c) {
int targsize = sizeof(char) * (s->count + 1);
if(s->size <= targsize) {
s->size = targsize * 2;
s->str = (char*)realloc(s->str, s->size);
}
s->str[s->count] = c;
s->count++;
}
void freestr(STRING* str) {
free(str->str);
free(str);
}
// Token manipulation;
TOKEN* appendtokenraw(TOKEN* curitem, STRING* token, int definedat, TOKENTYPE type) {
curitem->token = (char*)malloc(sizeof(char)*token->count);
strcpy(curitem->token, token->str);
curitem->definedat = definedat;
curitem->type = type;
TOKEN* nextitem = mktoken();
curitem->next = nextitem;
token->count = 0;
return nextitem;
}
void freetokens(TOKEN* t) {
free(t->token);
TOKEN* next = t->next;
free(t);
if(next != NULL)
freetokens(next);
}
TOKEN* appendtoken(TOKEN* curitem, STRING* token, char* file, int definedat) {
append(token, '\0');
return appendtokenraw(curitem, token, definedat, gettokentype(token, file, definedat));
}
// Char types
CHARTYPE getchartype(unsigned char c) {
if(isspace(c)) return space;
if(isalnum(c) || c == '_' || c == '"') return common;
return charsymbol;
}
bool iskeyword(STRING* tk) {
return existsinarray(&keywords, tk->str);
}
bool issymbol(STRING* tk) {
if(tk->count != 2)
return false;
return existsinarray(&symbols, tk->str);
}
bool isint(char* str) {
int i = 0;
while(str[i] != '\0') {
if(!isdigit(str[i]))
return false;
i++;
}
return true;
}
bool isintcons(STRING* tk) {
if(!isint(tk->str))
return false;
int val = atoi(tk->str);
return val >= 0 && val <= 32767;
}
bool isidentifier(STRING* tk) {
if(isdigit(tk->str[0]))
return false;
int count = tk->count - 1;
for(int i = 0; i < count; i++)
if(!isalnum(tk->str[i]) && tk->str[i] != '_')
return false;
return true;
}
TOKENTYPE gettokentype(STRING* tk, char* file, int definedat) {
if(iskeyword(tk)) return keyword;
if(issymbol(tk)) return symbol;
if(isintcons(tk)) return integer;
if(isidentifier(tk)) return identifier;
eprintf("Unexpected token '%s'; file '%s', line %i\n", tk->str, file, definedat);
exit(1);
}
// Stream handling
void skipln(FILE* input) {
unsigned char c;
while(c = fgetc(input), c != '\0')
if(c == '\n')
break;
}
void skipmultiln(FILE* input, int* lnscount) {
unsigned char c;
while(c = fgetc(input), c != '\0')
if(c == '\n')
(*lnscount)++;
else if(c == '*')
if(fgetc(input) == '/')
break;
}
bool handlecomment(FILE* input, int* lnscount) {
unsigned char nextc = fgetc(input);
if(nextc == '/') {
skipln(input);
(*lnscount)++;
return true;
}
else if(nextc == '*') {
unsigned char furtherc = fgetc(input);
if(furtherc == '*') {
skipmultiln(input, lnscount);
return true;
}
ungetc(furtherc, input);
}
ungetc(nextc, input);
return false;
}
void readstr(FILE* input, STRING* tmp, int definedat) {
unsigned char c;
while(c = fgetc(input), c != '\0') {
if(c == '\n') {
eprintf("Unexpected end of line; line %i", definedat);
exit(1);
}
if(c == '"')
break;
append(tmp, c);
}
append(tmp, '\0');
}
TOKEN* tokenize(char* file) {
TOKEN* head = mktoken();
TOKEN* lastitem = head;
TOKEN* curitem = head;
STRING* tmptoken = mkstring(200);
CHARTYPE lasttype = space;
CHARTYPE curtype;
int lnscount = 1;
FILE* input = fopen(file, "r");
unsigned char c;
while(!feof(input)) {
c = fgetc(input);
if(c == '\n')
lnscount++;
else if(c == '/' && handlecomment(input, &lnscount))
continue;
else if(c == '"') {
if(lasttype != space)
curitem = appendtoken(curitem, tmptoken, file, lnscount);
readstr(input, tmptoken, lnscount);
lastitem = curitem;
curitem = appendtokenraw(curitem, tmptoken, lnscount, string);
lasttype = space;
continue;
}
curtype = getchartype(c);
if(curtype == common) {
if(lasttype == charsymbol) {
lastitem = curitem;
curitem = appendtoken(curitem, tmptoken, file, lnscount);
}
append(tmptoken, c);
} else {
if(lasttype != space){
lastitem = curitem;
curitem = appendtoken(curitem, tmptoken, file, lnscount);
}
if(curtype == charsymbol)
append(tmptoken, c);
}
lasttype = curtype;
}
if(curitem == head) {
eprintf("File '%s' is empty\n", file);
exit(1);
}
lastitem->next = NULL;
free(curitem);
freestr(tmptoken);
fclose(input);
return head;
}

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#ifndef TOKENIZER_H
#define TOKENIZER_H
#include <stdio.h>
/* tokenizer
* Simple tool that splits a stream into many tokens. */
typedef enum {
keyword, identifier, symbol, integer, string
} TOKENTYPE;
typedef struct token {
char* token;
TOKENTYPE type;
int definedat;
struct token* next;
} TOKEN;
TOKEN* tokenize(char* filename);
void freetokens(TOKEN* t);
#endif

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#include <stdlib.h>
#include "vm-lines.h"
LINE* mkline(int size) {
LINE* ln = (LINE*)malloc(sizeof(LINE));
ln->tokens = (char**)malloc(sizeof(char*)*size);
ln->count = 0;
return ln;
}
void addtoken(LINE* ln, char* token) {
ln->tokens[ln->count] = token;
ln->count++;
}
void println(LINE* ln, FILE* stream) {
for(int i = 0; i < ln->count; i++) {
fprintf(stream, "%s", ln->tokens[i]);
if(i + 1 < ln->count)
fprintf(stream, " ");
}
fprintf(stream, "\n");
}
void printlns(LINE* lns, FILE* stream) {
while(lns != NULL) {
println(lns, stream);
lns = lns->next;
}
}
void freeln(LINE* ln) {
for(int i = 0; i < ln->count; i++)
free(ln->tokens[i]);
free(ln->tokens);
free(ln);
}
void freelns(LINE* lns) {
LINE* next = lns->next;
freeln(lns);
if(next != NULL)
freelns(next);
}
void freelnblk(LINEBLOCK* blk) {
freelns(blk->head);
free(blk);
}
LINEBLOCK* mklnblk(LINE* start) {
LINEBLOCK* blk = (LINEBLOCK*)malloc(sizeof(LINEBLOCK));
blk->head = start;
blk->tail = start;
return blk;
}
LINEBLOCK* mergelnblks(LINEBLOCK* head, LINEBLOCK* tail) {
if(head == NULL)
return tail;
head->tail->next = tail->head;
head->tail = tail->tail;
free(tail);
return head;
}
void appendln(LINEBLOCK* lnblk, LINE* ln) {
lnblk->tail->next = ln;
lnblk->tail = ln;
}
void appendlnbefore(LINEBLOCK* lnblk, LINE* ln) {
ln->next = lnblk->head;
lnblk->head = ln;
}

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#ifndef VM_LINES_H
#define VM_LINES_H
#include <stdio.h>
/* vm-lines
* Unified standard for the compiler's output and vm-translator's input.
* It is also used by vm-parser when reading .vm files. */
// Data types
typedef struct line {
char** tokens;
int count;
struct line* next;
} LINE;
typedef struct {
LINE* head;
LINE* tail;
} LINEBLOCK;
// Line manipulation
LINE* mkline(int size);
void addtoken(LINE* ln, char* token);
// Line printing
void println(LINE* ln, FILE* stream);
void printlns(LINE* lns, FILE* stream);
// Line freeing
void freeln(LINE* ln);
void freelns(LINE* lns);
void freelnblk(LINEBLOCK* blk);
// Line block manipulation
LINEBLOCK* mklnblk(LINE* start);
LINEBLOCK* mergelnblks(LINEBLOCK* head, LINEBLOCK* tail);
void appendln(LINEBLOCK* lnblk, LINE* ln);
void appendlnbefore(LINEBLOCK* lnblk, LINE* ln);
#endif

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#ifndef VM_TEMPLATES
#define VM_TEMPLATES
#else
#error vm-templates may only be included once
#endif
#include "util.h"
#define mktemplate(name, array) TEMPLATE name = { .items = array, .count = strcount(array) };
typedef struct {
char** items;
int count;
} TEMPLATE;
char* tpushlns[] = {
"",
"",
"",
"",
"A=D+A",
"D=M",
"@SP",
"A=M",
"M=D",
"@SP",
"M=M+1",
};
mktemplate(tpush, tpushlns);
char* tpushconslns[] = {
"",
"",
"D=A",
"@SP",
"A=M",
"M=D",
"@SP",
"M=M+1",
};
mktemplate(tpushcons, tpushconslns);
char* tpushstatlns[] = {
"",
"",
"D=M",
"@SP",
"A=M",
"M=D",
"@SP",
"M=M+1",
};
mktemplate(tpushstat, tpushstatlns);
mktemplate(tpushtemp, tpushstatlns);
mktemplate(tpushpointer, tpushstatlns);
char* tpoplns[] = {
"",
"",
"",
"",
"D=D+A",
"@R13",
"M=D",
"@SP",
"AM=M-1",
"D=M",
"@R13",
"A=M",
"M=D"
};
mktemplate(tpop, tpoplns);
char* tpopstatlns[] = {
"",
"@SP",
"AM=M-1",
"D=M",
"",
""
};
mktemplate(tpopstat, tpopstatlns);
mktemplate(tpoptemp, tpopstatlns);
mktemplate(tpoppointer, tpopstatlns);
char* tarithlns[] = {
"",
"@SP",
"AM=M-1",
"D=M",
"A=A-1",
""
};
mktemplate(tarith, tarithlns);
char* tneglns[] = {
"",
"@SP",
"A=M-1",
"M=-M",
};
mktemplate(tneg, tneglns);
char* tnotlns[] = {
"",
"@SP",
"A=M-1",
"M=!M",
};
mktemplate(tnot, tnotlns);
char* tcomplns[] = {
"",
"@SP",
"AM=M-1",
"D=M",
"A=A-1",
"D=D-M",
"M=-1",
"",
"",
"@SP",
"A=M-1",
"M=0",
""
};
mktemplate(tcomp, tcomplns);
char* tlabellns[] = {
"",
""
};
mktemplate(tlabel, tlabellns);
char* tgotolns[] = {
"",
"",
"0;JMP"
};
mktemplate(tgoto, tgotolns);
char* tifgotolns[] = {
"",
"@SP",
"AM=M-1",
"D=M",
"",
"D;JNE"
};
mktemplate(tifgoto, tifgotolns);
char* tcallstartlns[] = {
"",
"",
"D=A",
"@SP",
"A=M",
"M=D",
"@SP",
"M=M+1",
};
mktemplate(tcallstart, tcallstartlns);
char* tcallpushlns[] = {
"",
"D=M",
"@SP",
"A=M",
"M=D",
"@SP",
"M=M+1",
};
mktemplate(tcallpush, tcallpushlns);
char* tcallsetarglns[] = {
"@SP",
"D=M",
"@LCL",
"M=D",
"",
"D=D-A",
"@ARG",
"M=D"
};
mktemplate(tcallsetarg, tcallsetarglns);
char* tcalljmplns[] = {
"",
"0;JMP",
""
};
mktemplate(tcalljmp, tcalljmplns);
char* tframevarslns[] = {
"@LCL",
"@ARG",
"@THIS",
"@THAT"
};
mktemplate(tframevars, tframevarslns);
char* tfunctionlns[] = {
"",
""
};
mktemplate(tfunction, tfunctionlns);
char* tfunctionpushlns[] = {
"@SP",
"A=M",
"M=0",
"@SP",
"M=M+1"
};
mktemplate(tfunctionpush, tfunctionpushlns);
char* tstartreturnlns[] = {
"",
"@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"
};
mktemplate(tstartreturn, tstartreturnlns);
char* tretpoplns[] = {
"@LCL",
"AM=M-1",
"D=M",
"",
"M=D",
};
mktemplate(tretpop, tretpoplns);
char* tendreturnlns[] = {
"@R13",
"A=M",
"0;JMP"
};
mktemplate(tendreturn, tendreturnlns);
char* tbootstraplns[] = {
"@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)"
};
mktemplate(tbootstrap, tbootstraplns);

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#include <stdlib.h>
#include <string.h>
#include "vm-templates.h"
#include "vm-translator.h"
#include "util.h"
#define eq(translator, index, str) !strcmp(translator->currln->tokens[index], str)
typedef struct {
STRINGLIST* head;
STRINGLIST* tail;
} ASMBLK;
STRINGLIST* asmln(char* content) {
STRINGLIST* ln = (STRINGLIST*)malloc(sizeof(STRINGLIST));
ln->content = content;
return ln;
}
void togarbage(VMTRANSLATOR* t, char* str) {
STRINGLIST* garb = asmln(str);
garb->next = t->garbage;
t->garbage = garb;
}
char* atraw(VMTRANSLATOR* t, char* n, int len) {
int sz = sizeof(char) * (len + 2);
char* atstr = (char*)malloc(sz);
sprintf(atstr, "@%s", n);
togarbage(t, atstr);
return atstr;
}
char* at(VMTRANSLATOR* t, char* n) {
return atraw(t, n, strlen(n));
}
char* atn(VMTRANSLATOR* t, int n) {
char* str = itoa(n);
togarbage(t, str);
return at(t, str);
}
char* mkstr(VMTRANSLATOR* t, char* str) {
char* heapstr = ezheapstr(str);
togarbage(t, heapstr);
return heapstr;
}
char* mkpointerind(VMTRANSLATOR* t) {
if(t->currln->tokens[2][0] == 0)
return mkstr(t, "@THIS");
else
return mkstr(t, "@THAT");
}
char* mktempind(VMTRANSLATOR* t) {
int index = atoi(t->currln->tokens[2]);
char* actualind = itoa(index+5);
togarbage(t, actualind);
return at(t, actualind);
}
char* dotat(VMTRANSLATOR* t, char* name, char* n) {
int sz = sizeof(char) * (strlen(name) + strlen(n) + 3);
char* atstr = (char*)malloc(sz);
sprintf(atstr, "@%s.%s", name, n);
togarbage(t, atstr);
return atstr;
}
char* comment(VMTRANSLATOR* t) {
int sz = (4 + strlen(t->currln->tokens[0])) * sizeof(char);
for(int i = 1; i < t->currln->count; i++)
sz += (1 + strlen(t->currln->tokens[i])) * sizeof(char);
char* com = (char*)malloc(sz);
if(t->currln->count == 1)
sprintf(com, "// %s", t->currln->tokens[0]);
else if(t->currln->count == 2)
sprintf(com, "// %s %s", t->currln->tokens[0],
t->currln->tokens[1]);
else if(t->currln->count == 3)
sprintf(com, "// %s %s %s", t->currln->tokens[0],
t->currln->tokens[1],
t->currln->tokens[2]);
togarbage(t, com);
return com;
}
char* switchsegment(VMTRANSLATOR* t) {
if(eq(t, 1, "local"))
return mkstr(t, "@LCL");
if(eq(t, 1, "argument"))
return mkstr(t, "@ARG");
if(eq(t, 1, "this"))
return mkstr(t, "@THIS");
return mkstr(t, "@THAT");
}
char* mkspeciallab(VMTRANSLATOR* t, char* suffix, int* ind, int* len) {
(*ind)++;
*len = t->classnamelen + countplaces(*ind) + strlen(suffix) + 2;
int sz = ((*len)+1) * sizeof(char);
char* lab = (char*)malloc(sz);
sprintf(lab, "%s$%s.%i", t->classname, suffix, (*ind));
togarbage(t, lab);
return lab;
}
char* mkcmplab(VMTRANSLATOR* t, int* len) {
return mkspeciallab(t, "cmp", &(t->cmpind), len);
}
char* mkretlab(VMTRANSLATOR* t, int* len) {
return mkspeciallab(t, "ret", &(t->retind), len);
}
char* enclosingparenthesis(VMTRANSLATOR* t, char* content, int len) {
int sz = sizeof(char) * (len + 3);
char* str = (char*)malloc(sz);
sprintf(str, "(%s)", content);
togarbage(t, str);
return str;
}
char* mklab(VMTRANSLATOR* t) {
int sz = (t->classnamelen + strlen(t->currln->tokens[1]) + 4) * sizeof(char);
char* lab = (char*)malloc(sz);
sprintf(lab, "(%s$%s)", t->classname, t->currln->tokens[1]);
togarbage(t, lab);
return lab;
}
char* mkgotolab(VMTRANSLATOR* t) {
int sz = sizeof(char) * (t->classnamelen + strlen(t->currln->tokens[1]) + 3);
char* lab = (char*)malloc(sz);
sprintf(lab, "@%s$%s", t->classname, t->currln->tokens[1]);
togarbage(t, lab);
return lab;
}
ASMBLK* copytemplate(TEMPLATE* t) {
ASMBLK* blk = (ASMBLK*)malloc(sizeof(ASMBLK));
blk->head = asmln(t->items[0]);
STRINGLIST* curr = blk->head;
for(int i = 1; i < t->count; i++) {
STRINGLIST* newln = asmln(t->items[i]);
curr->next = newln;
curr = newln;
}
curr->next = NULL;
blk->tail = curr;
return blk;
}
ASMBLK* mkasmlns(VMTRANSLATOR* t, TEMPLATE* tp) {
// instruction comment
tp->items[0] = comment(t);
return copytemplate(tp);
}
void mergeasmblks(ASMBLK* a, ASMBLK* b) {
a->tail->next = b->head;
a->tail = b->tail;
free(b);
}
/* START STACK MANIPULATION */
ASMBLK* translatepushconst(VMTRANSLATOR* t) {
// @i
tpushcons.items[1] = at(t, t->currln->tokens[2]);
return mkasmlns(t, &tpushcons);
}
ASMBLK* translatepushstatic(VMTRANSLATOR* t) {
// @classname.i
tpushstat.items[1] = dotat(t, t->classname, t->currln->tokens[2]);
return mkasmlns(t, &tpushstat);
}
ASMBLK* translatepushpointer(VMTRANSLATOR* t) {
// @THIS/@THAT
tpushpointer.items[1] = mkpointerind(t);
return mkasmlns(t, &tpushpointer);
}
ASMBLK* translatepushtemp(VMTRANSLATOR* t) {
// @5+i
tpushtemp.items[1] = mktempind(t);
return mkasmlns(t, &tpushtemp);
}
void pushpopcommon(VMTRANSLATOR* t, TEMPLATE* tp) {
// @segment
tp->items[1] = switchsegment(t);
// D=M
tp->items[2] = mkstr(t, "D=M");
// @i
tp->items[3] = at(t, t->currln->tokens[2]);
}
ASMBLK* translatepushgeneric(VMTRANSLATOR* t) {
pushpopcommon(t, &tpush);
return mkasmlns(t, &tpush);
}
ASMBLK* translatepush(VMTRANSLATOR* t) {
if(eq(t, 1, "constant"))
return translatepushconst(t);
if(eq(t, 1, "static"))
return translatepushstatic(t);
if(eq(t, 1, "pointer"))
return translatepushpointer(t);
if(eq(t, 1, "temp"))
return translatepushtemp(t);
return translatepushgeneric(t);
}
ASMBLK* translatepopstatic(VMTRANSLATOR* t) {
// @classname.i
tpopstat.items[tpopstat.count-2] = dotat(t, t->classname, t->currln->tokens[2]);
// M=D
tpopstat.items[tpopstat.count-1] = mkstr(t, "M=D");
return mkasmlns(t, &tpopstat);
}
ASMBLK* translatepoppointer(VMTRANSLATOR* t) {
// @THIS/@THAT
tpoppointer.items[tpoppointer.count-2] = mkpointerind(t);
// M=D
tpoppointer.items[tpoppointer.count-1] = mkstr(t, "M=D");
return mkasmlns(t, &tpoppointer);
}
ASMBLK* translatepoptemp(VMTRANSLATOR* t) {
// @5+i
tpoptemp.items[tpoptemp.count-2] = mktempind(t);
tpoptemp.items[tpoptemp.count-1] = mkstr(t, "M=D");
return mkasmlns(t, &tpoptemp);
}
ASMBLK* translatepopgeneric(VMTRANSLATOR* t) {
pushpopcommon(t, &tpop);
return mkasmlns(t, &tpop);
}
ASMBLK* translatepop(VMTRANSLATOR* t) {
if(eq(t, 1, "static"))
return translatepopstatic(t);
if(eq(t, 1, "pointer"))
return translatepoppointer(t);
if(eq(t, 1, "temp"))
return translatepoptemp(t);
return translatepopgeneric(t);
}
/* END STACK MANIPULATION */
/* BEGIN OPERATIONS */
ASMBLK* translatearith(VMTRANSLATOR* t, char* op) {
tarith.items[tarith.count-1] = mkstr(t, op);
return mkasmlns(t, &tarith);
}
ASMBLK* translatecomp(VMTRANSLATOR* t, char* op) {
int labellen;
char* label = mkcmplab(t, &labellen);
// @label
tcomp.items[tcomp.count-6] = atraw(t, label, labellen);
// D;J(op)
int sz = sizeof(char) * 6;
char* trueop = (char*)malloc(sz);
sprintf(trueop, "D;J%s", op);
tcomp.items[tcomp.count-5] = trueop;
togarbage(t, trueop);
// (label)
tcomp.items[tcomp.count-1] = enclosingparenthesis(t, label, labellen);
return mkasmlns(t, &tcomp);
}
/* END OPERATIONS */
ASMBLK* translatelabel(VMTRANSLATOR* t) {
// (classname$label)
tlabel.items[tlabel.count-1] = mklab(t);
return mkasmlns(t, &tlabel);
}
ASMBLK* translategoto(VMTRANSLATOR* t) {
// @label
tgoto.items[tgoto.count-2] = mkgotolab(t);
return mkasmlns(t, &tgoto);
}
ASMBLK* translateifgoto(VMTRANSLATOR* t) {
// @label
tifgoto.items[tifgoto.count-2] = mkgotolab(t);
return mkasmlns(t, &tifgoto);
}
ASMBLK* translatereturn(VMTRANSLATOR* t) {
ASMBLK* blk = mkasmlns(t, &tstartreturn);
for(int i = tframevars.count-1; i >= 0; i--) {
tretpop.items[tretpop.count-2] = tframevars.items[i];
mergeasmblks(blk, copytemplate(&tretpop));
}
mergeasmblks(blk, copytemplate(&tendreturn));
return blk;
}
ASMBLK* translatefunction(VMTRANSLATOR* t) {
t->retind = 0;
t->cmpind = 0;
// (funcname)
tfunction.items[1] = mklab(t);
ASMBLK* blk = mkasmlns(t, &tfunction);
// repeat nVars times:
int nlocals = atoi(t->currln->tokens[2]);
for(int i = 0; i < nlocals; i++)
mergeasmblks(blk, copytemplate(&tfunctionpush));
return blk;
}
ASMBLK* pushframe(VMTRANSLATOR* t, char* retlab, int retlablen, int* framesize) {
tcallstart.items[1] = atraw(t, retlab, retlablen);
ASMBLK* blk = mkasmlns(t, &tcallstart);
for(int i = 0; i < tframevars.count; i++) {
tcallpush.items[0] = tframevars.items[i];
mergeasmblks(blk, copytemplate((&tcallpush)));
}
*framesize = tframevars.count + 1;
return blk;
}
ASMBLK* translatecall(VMTRANSLATOR* t) {
// return label
int retlablen;
char* retlab = mkretlab(t, &retlablen);
// push frame
int framesize;
ASMBLK* blk = pushframe(t, retlab, retlablen, &framesize);
// setting ARG
int nargs = atoi(t->currln->tokens[2]);
tcallsetarg.items[tcallsetarg.count-4] = atn(t, nargs + framesize);
mergeasmblks(blk, copytemplate(&tcallsetarg));
// jmp
tcalljmp.items[tcalljmp.count-3] = at(t, t->currln->tokens[1]);
tcalljmp.items[tcalljmp.count-1] = enclosingparenthesis(t, retlab, retlablen);
mergeasmblks(blk, copytemplate(&tcalljmp));
return blk;
}
ASMBLK* translateln(VMTRANSLATOR* t) {
if(eq(t, 0, "push"))
return translatepush(t);
if(eq(t, 0, "pop"))
return translatepop(t);
if(eq(t, 0, "add"))
return translatearith(t, "M=D+M");
if(eq(t, 0, "sub"))
return translatearith(t, "M=M-D");
if(eq(t, 0, "and"))
return translatearith(t, "M=D&M");
if(eq(t, 0, "or"))
return translatearith(t, "M=D|M");
if(eq(t, 0, "neg"))
return mkasmlns(t, &tneg);
if(eq(t, 0, "not"))
return mkasmlns(t, &tnot);
if(eq(t, 0, "eq"))
return translatecomp(t, "EQ");
if(eq(t, 0, "gt"))
return translatecomp(t, "LT");
if(eq(t, 0, "lt"))
return translatecomp(t, "GT");
if(eq(t, 0, "label"))
return translatelabel(t);
if(eq(t, 0, "goto"))
return translategoto(t);
if(eq(t, 0, "if-goto"))
return translateifgoto(t);
if(eq(t, 0, "return"))
return translatereturn(t);
if(eq(t, 0, "function"))
return translatefunction(t);
return translatecall(t);
}
STRINGLIST* translatevm(VMTRANSLATOR* t) {
ASMBLK* blk = copytemplate(&tbootstrap);
while(t->currln != NULL) {
mergeasmblks(blk, translateln(t));
t->currln = t->currln->next;
}
STRINGLIST* output = blk->head;
free(blk);
return output;
}
VMTRANSLATOR* mkvmtranslator(char* classname, LINEBLOCK* vmlines) {
VMTRANSLATOR* transl = (VMTRANSLATOR*)malloc(sizeof(VMTRANSLATOR));
transl->currln = vmlines->head;
transl->start = vmlines->head;
transl->garbage = NULL;
transl->retind = 0;
transl->cmpind = 0;
transl->classname = classname;
transl->classnamelen = strlen(classname);
return transl;
}
void freegarbage(STRINGLIST* garbage) {
if(garbage != NULL) {
free(garbage->content);
STRINGLIST* next = garbage->next;
free(garbage);
freegarbage(next);
}
}
void freevmtranslator(VMTRANSLATOR* t) {
freegarbage(t->garbage);
free(t);
}

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#ifndef VM_TRANSLATOR
#define VM_TRANSLATOR
#include "vm-lines.h"
typedef struct {
char* classname;
int classnamelen;
LINE* start;
LINE* currln;
STRINGLIST* garbage;
int cmpind;
int retind;
} VMTRANSLATOR;
STRINGLIST* translatevm(VMTRANSLATOR* t);
VMTRANSLATOR* mkvmtranslator(char* classname, LINEBLOCK* vmlines);
void freevmtranslator(VMTRANSLATOR* t);
#endif