Exemple #1
0
void
walkswitch(Node *sw)
{
	/*
	 * reorder the body into (OLIST, cases, statements)
	 * cases have OGOTO into statements.
	 * both have inserted OBREAK statements
	 */
	if(sw->ntest == N) {
		sw->ntest = nodbool(1);
		typecheck(&sw->ntest, Erv);
	}

	if(sw->ntest->op == OTYPESW) {
		typeswitch(sw);
//dump("sw", sw);
		return;
	}
	exprswitch(sw);
}
Exemple #2
0
Fichier : swt.c Projet : 8l/go
void
walkswitch(Node *sw)
{
	/*
	 * reorder the body into (OLIST, cases, statements)
	 * cases have OGOTO into statements.
	 * both have inserted OBREAK statements
	 */
	if(sw->ntest == N) {
		sw->ntest = nodbool(1);
		typecheck(&sw->ntest, Erv);
	}

	if(sw->ntest->op == OTYPESW) {
		typeswitch(sw);
//dump("sw", sw);
		return;
	}
	exprswitch(sw);
	// Discard old AST elements after a walk. They can confuse racewealk.
	sw->ntest = nil;
	sw->list = nil;
}
Exemple #3
0
Fichier : swt.c Projet : 8l/go
/*
 * normal (expression) switch.
 * rebulid case statements into if .. goto
 */
static void
exprswitch(Node *sw)
{
	Node *def;
	NodeList *cas;
	Node *a;
	Case *c0, *c, *c1;
	Type *t;
	int arg, ncase;

	casebody(sw, N);

	arg = Snorm;
	if(isconst(sw->ntest, CTBOOL)) {
		arg = Strue;
		if(sw->ntest->val.u.bval == 0)
			arg = Sfalse;
	}
	walkexpr(&sw->ntest, &sw->ninit);
	t = sw->type;
	if(t == T)
		return;

	/*
	 * convert the switch into OIF statements
	 */
	exprname = N;
	cas = nil;
	if(arg != Strue && arg != Sfalse) {
		exprname = temp(sw->ntest->type);
		cas = list1(nod(OAS, exprname, sw->ntest));
		typechecklist(cas, Etop);
	} else {
		exprname = nodbool(arg == Strue);
	}

	c0 = mkcaselist(sw, arg);
	if(c0 != C && c0->type == Tdefault) {
		def = c0->node->right;
		c0 = c0->link;
	} else {
		def = nod(OBREAK, N, N);
	}

loop:
	if(c0 == C) {
		cas = list(cas, def);
		sw->nbody = concat(cas, sw->nbody);
		sw->list = nil;
		walkstmtlist(sw->nbody);
		return;
	}

	// deal with the variables one-at-a-time
	if(!okforcmp[t->etype] || c0->type != Texprconst) {
		a = exprbsw(c0, 1, arg);
		cas = list(cas, a);
		c0 = c0->link;
		goto loop;
	}

	// do binary search on run of constants
	ncase = 1;
	for(c=c0; c->link!=C; c=c->link) {
		if(c->link->type != Texprconst)
			break;
		ncase++;
	}

	// break the chain at the count
	c1 = c->link;
	c->link = C;

	// sort and compile constants
	c0 = csort(c0, exprcmp);
	a = exprbsw(c0, ncase, arg);
	cas = list(cas, a);

	c0 = c1;
	goto loop;

}
Exemple #4
0
void
walkrange(Node *n)
{
	Node *ohv1, *hv1, *hv2;	// hidden (old) val 1, 2
	Node *ha, *hit;	// hidden aggregate, iterator
	Node *hn, *hp;	// hidden len, pointer
	Node *hb;  // hidden bool
	Node *a, *v1, *v2;	// not hidden aggregate, val 1, 2
	Node *fn, *tmp;
	NodeList *body, *init;
	Type *th, *t;
	int lno;

	t = n->type;
	init = nil;

	a = n->right;
	lno = setlineno(a);
	if(t->etype == TSTRING && !eqtype(t, types[TSTRING])) {
		a = nod(OCONV, n->right, N);
		a->type = types[TSTRING];
	}

	v1 = n->list->n;
	v2 = N;
	if(n->list->next)
		v2 = n->list->next->n;
	hv2 = N;

	if(v2 == N && t->etype == TARRAY) {
		// will have just one reference to argument.
		// no need to make a potentially expensive copy.
		ha = a;
	} else {
		ha = temp(a->type);
		init = list(init, nod(OAS, ha, a));
	}

	switch(t->etype) {
	default:
		fatal("walkrange");

	case TARRAY:
		hv1 = temp(types[TINT]);
		hn = temp(types[TINT]);
		hp = nil;

		init = list(init, nod(OAS, hv1, N));
		init = list(init, nod(OAS, hn, nod(OLEN, ha, N)));
		if(v2) {
			hp = temp(ptrto(n->type->type));
			tmp = nod(OINDEX, ha, nodintconst(0));
			tmp->etype = 1;	// no bounds check
			init = list(init, nod(OAS, hp, nod(OADDR, tmp, N)));
		}

		n->ntest = nod(OLT, hv1, hn);
		n->nincr = nod(OASOP, hv1, nodintconst(1));
		n->nincr->etype = OADD;
		if(v2 == N)
			body = list1(nod(OAS, v1, hv1));
		else {
			a = nod(OAS2, N, N);
			a->list = list(list1(v1), v2);
			a->rlist = list(list1(hv1), nod(OIND, hp, N));
			body = list1(a);

			tmp = nod(OADD, hp, nodintconst(t->type->width));
			tmp->type = hp->type;
			tmp->typecheck = 1;
			tmp->right->type = types[tptr];
			tmp->right->typecheck = 1;
			body = list(body, nod(OAS, hp, tmp));
		}
		break;

	case TMAP:
		th = typ(TARRAY);
		th->type = ptrto(types[TUINT8]);
		// see ../../pkg/runtime/hashmap.h:/hash_iter
		// Size in words.
		th->bound = 5 + 4*3 + 4*4/widthptr;
		hit = temp(th);

		fn = syslook("mapiterinit", 1);
		argtype(fn, t->down);
		argtype(fn, t->type);
		argtype(fn, th);
		init = list(init, mkcall1(fn, T, nil, typename(t), ha, nod(OADDR, hit, N)));
		n->ntest = nod(ONE, nod(OINDEX, hit, nodintconst(0)), nodnil());

		fn = syslook("mapiternext", 1);
		argtype(fn, th);
		n->nincr = mkcall1(fn, T, nil, nod(OADDR, hit, N));

		if(v2 == N) {
			fn = syslook("mapiter1", 1);
			argtype(fn, th);
			argtype(fn, t->down);
			a = nod(OAS, v1, mkcall1(fn, t->down, nil, nod(OADDR, hit, N)));
		} else {
			fn = syslook("mapiter2", 1);
			argtype(fn, th);
			argtype(fn, t->down);
			argtype(fn, t->type);
			a = nod(OAS2, N, N);
			a->list = list(list1(v1), v2);
			a->rlist = list1(mkcall1(fn, getoutargx(fn->type), nil, nod(OADDR, hit, N)));
		}
		body = list1(a);
		break;

	case TCHAN:
		hv1 = temp(t->type);
		hb = temp(types[TBOOL]);

		n->ntest = nod(ONE, hb, nodbool(0));
		a = nod(OAS2RECV, N, N);
		a->typecheck = 1;
		a->list = list(list1(hv1), hb);
		a->rlist = list1(nod(ORECV, ha, N));
		n->ntest->ninit = list1(a);
		body = list1(nod(OAS, v1, hv1));
		break;

	case TSTRING:
		ohv1 = temp(types[TINT]);

		hv1 = temp(types[TINT]);
		init = list(init, nod(OAS, hv1, N));

		if(v2 == N)
			a = nod(OAS, hv1, mkcall("stringiter", types[TINT], nil, ha, hv1));
		else {
			hv2 = temp(runetype);
			a = nod(OAS2, N, N);
			a->list = list(list1(hv1), hv2);
			fn = syslook("stringiter2", 0);
			a->rlist = list1(mkcall1(fn, getoutargx(fn->type), nil, ha, hv1));
		}
		n->ntest = nod(ONE, hv1, nodintconst(0));
		n->ntest->ninit = list(list1(nod(OAS, ohv1, hv1)), a);

		body = list1(nod(OAS, v1, ohv1));
		if(v2 != N)
			body = list(body, nod(OAS, v2, hv2));
		break;
	}

	n->op = OFOR;
	typechecklist(init, Etop);
	n->ninit = concat(n->ninit, init);
	typechecklist(n->ntest->ninit, Etop);
	typecheck(&n->ntest, Erv);
	typecheck(&n->nincr, Etop);
	typechecklist(body, Etop);
	n->nbody = concat(body, n->nbody);
	walkstmt(&n);
	
	lineno = lno;
}
Exemple #5
0
/*
 * generate:
 *	res = n;
 * simplifies and calls gmove.
 */
void
cgen(Node *n, Node *res)
{
	Node *nl, *nr, *r;
	Node n1, n2;
	int a, f;
	Prog *p1, *p2, *p3;
	Addr addr;

	if(debug['g']) {
		dump("\ncgen-n", n);
		dump("cgen-res", res);
	}
	if(n == N || n->type == T)
		goto ret;

	if(res == N || res->type == T)
		fatal("cgen: res nil");

	while(n->op == OCONVNOP)
		n = n->left;

	// inline slices
	if(cgen_inline(n, res))
		goto ret;

	if(n->ullman >= UINF) {
		if(n->op == OINDREG)
			fatal("cgen: this is going to misscompile");
		if(res->ullman >= UINF) {
			tempname(&n1, n->type);
			cgen(n, &n1);
			cgen(&n1, res);
			goto ret;
		}
	}

	if(isfat(n->type)) {
		sgen(n, res, n->type->width);
		goto ret;
	}

	if(!res->addable) {
		if(n->ullman > res->ullman) {
			regalloc(&n1, n->type, res);
			cgen(n, &n1);
			if(n1.ullman > res->ullman) {
				dump("n1", &n1);
				dump("res", res);
				fatal("loop in cgen");
			}
			cgen(&n1, res);
			regfree(&n1);
			goto ret;
		}

		if(res->ullman >= UINF)
			goto gen;

		if(complexop(n, res)) {
			complexgen(n, res);
			goto ret;
		}

		f = 1;	// gen thru register
		switch(n->op) {
		case OLITERAL:
			if(smallintconst(n))
				f = 0;
			break;
		case OREGISTER:
			f = 0;
			break;
		}

		if(!iscomplex[n->type->etype]) {
			a = optoas(OAS, res->type);
			if(sudoaddable(a, res, &addr)) {
				if(f) {
					regalloc(&n2, res->type, N);
					cgen(n, &n2);
					p1 = gins(a, &n2, N);
					regfree(&n2);
				} else
					p1 = gins(a, n, N);
				p1->to = addr;
				if(debug['g'])
					print("%P [ignore previous line]\n", p1);
				sudoclean();
				goto ret;
			}
		}

	gen:
		igen(res, &n1, N);
		cgen(n, &n1);
		regfree(&n1);
		goto ret;
	}

	// update addressability for string, slice
	// can't do in walk because n->left->addable
	// changes if n->left is an escaping local variable.
	switch(n->op) {
	case OLEN:
		if(isslice(n->left->type) || istype(n->left->type, TSTRING))
			n->addable = n->left->addable;
		break;
	case OCAP:
		if(isslice(n->left->type))
			n->addable = n->left->addable;
		break;
	}

	if(complexop(n, res)) {
		complexgen(n, res);
		goto ret;
	}

	if(n->addable) {
		gmove(n, res);
		goto ret;
	}

	nl = n->left;
	nr = n->right;

	if(nl != N && nl->ullman >= UINF)
	if(nr != N && nr->ullman >= UINF) {
		tempname(&n1, nl->type);
		cgen(nl, &n1);
		n2 = *n;
		n2.left = &n1;
		cgen(&n2, res);
		goto ret;
	}

	if(!iscomplex[n->type->etype]) {
		a = optoas(OAS, n->type);
		if(sudoaddable(a, n, &addr)) {
			if(res->op == OREGISTER) {
				p1 = gins(a, N, res);
				p1->from = addr;
			} else {
				regalloc(&n2, n->type, N);
				p1 = gins(a, N, &n2);
				p1->from = addr;
				gins(a, &n2, res);
				regfree(&n2);
			}
			sudoclean();
			goto ret;
		}
	}

	switch(n->op) {
	default:
		dump("cgen", n);
		fatal("cgen: unknown op %N", n);
		break;

	// these call bgen to get a bool value
	case OOROR:
	case OANDAND:
	case OEQ:
	case ONE:
	case OLT:
	case OLE:
	case OGE:
	case OGT:
	case ONOT:
		p1 = gbranch(AJMP, T);
		p2 = pc;
		gmove(nodbool(1), res);
		p3 = gbranch(AJMP, T);
		patch(p1, pc);
		bgen(n, 1, p2);
		gmove(nodbool(0), res);
		patch(p3, pc);
		goto ret;

	case OPLUS:
		cgen(nl, res);
		goto ret;

	// unary
	case OCOM:
		a = optoas(OXOR, nl->type);
		regalloc(&n1, nl->type, N);
		cgen(nl, &n1);
		nodconst(&n2, nl->type, -1);
		gins(a, &n2, &n1);
		gmove(&n1, res);
		regfree(&n1);
		goto ret;

	case OMINUS:
		if(isfloat[nl->type->etype]) {
			nr = nodintconst(-1);
			convlit(&nr, n->type);
			a = optoas(OMUL, nl->type);
			goto sbop;
		}
		a = optoas(n->op, nl->type);
		goto uop;

	// symmetric binary
	case OAND:
	case OOR:
	case OXOR:
	case OADD:
	case OMUL:
		a = optoas(n->op, nl->type);
		if(a != AIMULB)
			goto sbop;
		cgen_bmul(n->op, nl, nr, res);
		break;

	// asymmetric binary
	case OSUB:
		a = optoas(n->op, nl->type);
		goto abop;

	case OCONV:
		regalloc(&n1, nl->type, res);
		regalloc(&n2, n->type, &n1);
		cgen(nl, &n1);

		// if we do the conversion n1 -> n2 here
		// reusing the register, then gmove won't
		// have to allocate its own register.
		gmove(&n1, &n2);
		gmove(&n2, res);
		regfree(&n2);
		regfree(&n1);
		break;

	case ODOT:
	case ODOTPTR:
	case OINDEX:
	case OIND:
	case ONAME:	// PHEAP or PPARAMREF var
		igen(n, &n1, res);
		gmove(&n1, res);
		regfree(&n1);
		break;

	case OLEN:
		if(istype(nl->type, TMAP) || istype(nl->type, TCHAN)) {
			// map and chan have len in the first 32-bit word.
			// a zero pointer means zero length
			regalloc(&n1, types[tptr], res);
			cgen(nl, &n1);

			nodconst(&n2, types[tptr], 0);
			gins(optoas(OCMP, types[tptr]), &n1, &n2);
			p1 = gbranch(optoas(OEQ, types[tptr]), T);

			n2 = n1;
			n2.op = OINDREG;
			n2.type = types[TINT32];
			gmove(&n2, &n1);

			patch(p1, pc);

			gmove(&n1, res);
			regfree(&n1);
			break;
		}
		if(istype(nl->type, TSTRING) || isslice(nl->type)) {
			// both slice and string have len one pointer into the struct.
			// a zero pointer means zero length
			regalloc(&n1, types[tptr], res);
			agen(nl, &n1);
			n1.op = OINDREG;
			n1.type = types[TUINT32];
			n1.xoffset = Array_nel;
			gmove(&n1, res);
			regfree(&n1);
			break;
		}
		fatal("cgen: OLEN: unknown type %lT", nl->type);
		break;

	case OCAP:
		if(istype(nl->type, TCHAN)) {
			// chan has cap in the second 32-bit word.
			// a zero pointer means zero length
			regalloc(&n1, types[tptr], res);
			cgen(nl, &n1);

			nodconst(&n2, types[tptr], 0);
			gins(optoas(OCMP, types[tptr]), &n1, &n2);
			p1 = gbranch(optoas(OEQ, types[tptr]), T);

			n2 = n1;
			n2.op = OINDREG;
			n2.xoffset = 4;
			n2.type = types[TINT32];
			gmove(&n2, &n1);

			patch(p1, pc);

			gmove(&n1, res);
			regfree(&n1);
			break;
		}
		if(isslice(nl->type)) {
			regalloc(&n1, types[tptr], res);
			agen(nl, &n1);
			n1.op = OINDREG;
			n1.type = types[TUINT32];
			n1.xoffset = Array_cap;
			gmove(&n1, res);
			regfree(&n1);
			break;
		}
		fatal("cgen: OCAP: unknown type %lT", nl->type);
		break;

	case OADDR:
		agen(nl, res);
		break;

	case OCALLMETH:
		cgen_callmeth(n, 0);
		cgen_callret(n, res);
		break;

	case OCALLINTER:
		cgen_callinter(n, res, 0);
		cgen_callret(n, res);
		break;

	case OCALLFUNC:
		cgen_call(n, 0);
		cgen_callret(n, res);
		break;

	case OMOD:
	case ODIV:
		if(isfloat[n->type->etype]) {
			a = optoas(n->op, nl->type);
			goto abop;
		}
		cgen_div(n->op, nl, nr, res);
		break;

	case OLSH:
	case ORSH:
		cgen_shift(n->op, nl, nr, res);
		break;
	}
	goto ret;

sbop:	// symmetric binary
	if(nl->ullman < nr->ullman) {
		r = nl;
		nl = nr;
		nr = r;
	}

abop:	// asymmetric binary
	if(nl->ullman >= nr->ullman) {
		regalloc(&n1, nl->type, res);
		cgen(nl, &n1);

		if(sudoaddable(a, nr, &addr)) {
			p1 = gins(a, N, &n1);
			p1->from = addr;
			gmove(&n1, res);
			sudoclean();
			regfree(&n1);
			goto ret;
		}
		regalloc(&n2, nr->type, N);
		cgen(nr, &n2);
	} else {
		regalloc(&n2, nr->type, N);
		cgen(nr, &n2);
		regalloc(&n1, nl->type, res);
		cgen(nl, &n1);
	}
	gins(a, &n2, &n1);
	gmove(&n1, res);
	regfree(&n1);
	regfree(&n2);
	goto ret;

uop:	// unary
	regalloc(&n1, nl->type, res);
	cgen(nl, &n1);
	gins(a, N, &n1);
	gmove(&n1, res);
	regfree(&n1);
	goto ret;

ret:
	;
}