1 files changed, 545 insertions, 0 deletions

diff --git a/code/tools/lcc/src/enode.c b/code/tools/lcc/src/enode.c
new file mode 100644
index 0000000..760096d
--- /dev/null
+++ b/code/tools/lcc/src/enode.c
@@ -0,0 +1,545 @@
+#include "c.h"
+
+
+static Tree addtree(int, Tree, Tree);
+static Tree andtree(int, Tree, Tree);
+static Tree cmptree(int, Tree, Tree);
+static int compatible(Type, Type);
+static int isnullptr(Tree e);
+static Tree multree(int, Tree, Tree);
+static Tree subtree(int, Tree, Tree);
+#define isvoidptr(ty) \
+	(isptr(ty) && unqual(ty->type) == voidtype)
+
+Tree (*optree[])(int, Tree, Tree) = {
+#define xx(a,b,c,d,e,f,g) e,
+#define yy(a,b,c,d,e,f,g) e,
+#include "token.h"
+};
+Tree call(Tree f, Type fty, Coordinate src) {
+	int n = 0;
+	Tree args = NULL, r = NULL, e;
+	Type *proto, rty = unqual(freturn(fty));
+	Symbol t3 = NULL;
+
+	if (fty->u.f.oldstyle)
+		proto = NULL;
+	else
+		proto = fty->u.f.proto;
+	if (hascall(f))
+		r = f;
+	if (isstruct(rty))
+		{
+			t3 = temporary(AUTO, unqual(rty));
+			if (rty->size == 0)
+				error("illegal use of incomplete type `%t'\n", rty);
+		}
+	if (t != ')')
+		for (;;) {
+			Tree q = pointer(expr1(0));
+			if (proto && *proto && *proto != voidtype)
+				{
+					Type aty;
+					q = value(q);
+					aty = assign(*proto, q);
+					if (aty)
+						q = cast(q, aty);
+					else
+						error("type error in argument %d to %s; found `%t' expected `%t'\n", n + 1, funcname(f),
+
+							q->type, *proto);
+					if ((isint(q->type) || isenum(q->type))
+					&& q->type->size != inttype->size)
+						q = cast(q, promote(q->type));
+					++proto;
+				}
+			else
+				{
+					if (!fty->u.f.oldstyle && *proto == NULL)
+						error("too many arguments to %s\n", funcname(f));
+					q = value(q);
+					if (isarray(q->type) || q->type->size == 0)
+						error("type error in argument %d to %s; `%t' is illegal\n", n + 1, funcname(f), q->type);
+
+					else
+						q = cast(q, promote(q->type));
+				}
+			if (!IR->wants_argb && isstruct(q->type)) {
+				if (iscallb(q))
+					q = addrof(q);
+				else {
+					Symbol t1 = temporary(AUTO, unqual(q->type));
+					q = asgn(t1, q);
+					q = tree(RIGHT, ptr(t1->type),
+						root(q), lvalue(idtree(t1)));
+				}
+			}
+			if (q->type->size == 0)
+				q->type = inttype;
+			if (hascall(q))
+				r = r ? tree(RIGHT, voidtype, r, q) : q;
+			args = tree(mkop(ARG, q->type), q->type, q, args);
+			n++;
+			if (Aflag >= 2 && n == 32)
+				warning("more than 31 arguments in a call to %s\n",
+					funcname(f));
+			if (t != ',')
+				break;
+			t = gettok();
+		}
+	expect(')');
+	if (proto && *proto && *proto != voidtype)
+		error("insufficient number of arguments to %s\n",
+			funcname(f));
+	if (r)
+		args = tree(RIGHT, voidtype, r, args);
+	e = calltree(f, rty, args, t3);
+	if (events.calls)
+		apply(events.calls, &src, &e);
+	return e;
+}
+Tree calltree(Tree f, Type ty, Tree args, Symbol t3) {
+	Tree p;
+
+	if (args)
+		f = tree(RIGHT, f->type, args, f);
+	if (isstruct(ty))
+		assert(t3),
+		p = tree(RIGHT, ty,
+			tree(CALL+B, ty, f, addrof(idtree(t3))),
+			idtree(t3));
+	else {
+		Type rty = ty;
+		if (isenum(ty))
+			rty = unqual(ty)->type;
+		if (!isfloat(rty))
+			rty = promote(rty);
+		p = tree(mkop(CALL, rty), rty, f, NULL);
+		if (isptr(ty) || p->type->size > ty->size)
+			p = cast(p, ty);
+	}
+	return p;
+}
+Tree vcall(Symbol func, Type ty, ...) {
+	va_list ap;
+	Tree args = NULL, e, f = pointer(idtree(func)), r = NULL;
+
+	assert(isfunc(func->type));
+	if (ty == NULL)
+		ty = freturn(func->type);
+	va_start(ap, ty);
+	while ((e = va_arg(ap, Tree)) != NULL) {
+		if (hascall(e))
+			r = r == NULL ? e : tree(RIGHT, voidtype, r, e);
+		args = tree(mkop(ARG, e->type), e->type, e, args);
+	}
+	va_end(ap);
+	if (r != NULL)
+		args = tree(RIGHT, voidtype, r, args);
+	return calltree(f, ty, args, NULL);
+}
+int iscallb(Tree e) {
+	return e->op == RIGHT && e->kids[0] && e->kids[1]
+		&& e->kids[0]->op == CALL+B
+		&& e->kids[1]->op == INDIR+B
+		&& isaddrop(e->kids[1]->kids[0]->op)
+		&& e->kids[1]->kids[0]->u.sym->temporary;
+}
+
+static Tree addtree(int op, Tree l, Tree r) {
+	Type ty = inttype;
+
+	if (isarith(l->type) && isarith(r->type)) {
+		ty = binary(l->type, r->type);
+		l = cast(l, ty);
+		r = cast(r, ty);		
+	} else if (isptr(l->type) && isint(r->type))
+		return addtree(ADD, r, l);
+	else if (  isptr(r->type) && isint(l->type)
+	&& !isfunc(r->type->type))
+		{
+			long n;
+			ty = unqual(r->type);
+			n = unqual(ty->type)->size;
+			if (n == 0)
+				error("unknown size for type `%t'\n", ty->type);
+			l = cast(l, promote(l->type));
+			if (n > 1)
+				l = multree(MUL, cnsttree(signedptr, n), l);
+			if (YYcheck && !isaddrop(r->op))		/* omit */
+				return nullcall(ty, YYcheck, r, l);	/* omit */
+			return simplify(ADD, ty, l, r);
+		}
+
+	else
+		typeerror(op, l, r);
+	return simplify(op, ty, l, r);
+}
+
+Tree cnsttree(Type ty, ...) {
+	Tree p = tree(mkop(CNST,ty), ty, NULL, NULL);
+	va_list ap;
+
+	va_start(ap, ty);
+	switch (ty->op) {
+	case INT:     p->u.v.i = va_arg(ap, long); break;
+	case UNSIGNED:p->u.v.u = va_arg(ap, unsigned long)&ones(8*ty->size); break;
+	case FLOAT:   p->u.v.d = va_arg(ap, double); break;
+	case POINTER: p->u.v.p = va_arg(ap, void *); break;
+	default: assert(0);
+	}
+	va_end(ap);
+	return p;
+}
+
+Tree consttree(unsigned n, Type ty) {
+	if (isarray(ty))
+		ty = atop(ty);
+	else assert(isint(ty));
+	return cnsttree(ty, (unsigned long)n);
+}
+static Tree cmptree(int op, Tree l, Tree r) {
+	Type ty;
+
+	if (isarith(l->type) && isarith(r->type)) {
+		ty = binary(l->type, r->type);
+		l = cast(l, ty);
+		r = cast(r, ty);
+	} else if (compatible(l->type, r->type)) {
+		ty = unsignedptr;
+		l = cast(l, ty);
+		r = cast(r, ty);
+	} else {
+		ty = unsignedtype;
+		typeerror(op, l, r);
+	}
+	return simplify(mkop(op,ty), inttype, l, r);
+}
+static int compatible(Type ty1, Type ty2) {
+	return isptr(ty1) && !isfunc(ty1->type)
+	    && isptr(ty2) && !isfunc(ty2->type)
+	    && eqtype(unqual(ty1->type), unqual(ty2->type), 0);
+}
+static int isnullptr(Tree e) {
+	Type ty = unqual(e->type);
+
+	return generic(e->op) == CNST
+	    && ((ty->op == INT      && e->u.v.i == 0)
+	     || (ty->op == UNSIGNED && e->u.v.u == 0)
+	     || (isvoidptr(ty)      && e->u.v.p == NULL));
+}
+Tree eqtree(int op, Tree l, Tree r) {
+	Type xty = l->type, yty = r->type;
+
+	if ((isptr(xty) && isnullptr(r))
+	||  (isptr(xty) && !isfunc(xty->type) && isvoidptr(yty))
+	||  (isptr(xty) && isptr(yty)
+	    && eqtype(unqual(xty->type), unqual(yty->type), 1))) {
+		Type ty = unsignedptr;
+		l = cast(l, ty);
+		r = cast(r, ty);
+		return simplify(mkop(op,ty), inttype, l, r);
+	}
+	if ((isptr(yty) && isnullptr(l))
+	||  (isptr(yty) && !isfunc(yty->type) && isvoidptr(xty)))
+		return eqtree(op, r, l);
+	return cmptree(op, l, r);
+}
+
+Type assign(Type xty, Tree e) {
+	Type yty = unqual(e->type);
+
+	xty = unqual(xty);
+	if (isenum(xty))
+		xty = xty->type;
+	if (xty->size == 0 || yty->size == 0)
+		return NULL;
+	if ( (isarith(xty) && isarith(yty))
+	||  (isstruct(xty) && xty == yty))
+		return xty;
+	if (isptr(xty) && isnullptr(e))
+		return xty;
+	if (((isvoidptr(xty) && isptr(yty))
+	  || (isptr(xty)     && isvoidptr(yty)))
+	&& (  (isconst(xty->type)    || !isconst(yty->type))
+	   && (isvolatile(xty->type) || !isvolatile(yty->type))))
+		return xty;
+
+	if ((isptr(xty) && isptr(yty)
+	    && eqtype(unqual(xty->type), unqual(yty->type), 1))
+	&&  (  (isconst(xty->type)    || !isconst(yty->type))
+	    && (isvolatile(xty->type) || !isvolatile(yty->type))))
+		return xty;
+	if (isptr(xty) && isptr(yty)
+	&& (  (isconst(xty->type)    || !isconst(yty->type))
+	   && (isvolatile(xty->type) || !isvolatile(yty->type)))) {
+		Type lty = unqual(xty->type), rty = unqual(yty->type);
+		if ((isenum(lty) && rty == inttype)
+		||  (isenum(rty) && lty == inttype)) {
+			if (Aflag >= 1)
+				warning("assignment between `%t' and `%t' is compiler-dependent\n",
+					xty, yty);
+			return xty;
+		}
+	}
+	return NULL;
+}
+Tree asgntree(int op, Tree l, Tree r) {
+	Type aty, ty;
+
+	r = pointer(r);
+	ty = assign(l->type, r);
+	if (ty)
+		r = cast(r, ty);
+	else {
+		typeerror(ASGN, l, r);
+		if (r->type == voidtype)
+			r = retype(r, inttype);
+		ty = r->type;
+	}
+	if (l->op != FIELD)
+		l = lvalue(l);
+	aty = l->type;
+	if (isptr(aty))
+		aty = unqual(aty)->type;
+	if ( isconst(aty)
+	||  (isstruct(aty) && unqual(aty)->u.sym->u.s.cfields)) {
+		if (isaddrop(l->op)
+		&& !l->u.sym->computed && !l->u.sym->generated)
+			error("assignment to const identifier `%s'\n",
+				l->u.sym->name);
+		else
+			error("assignment to const location\n");
+	}
+	if (l->op == FIELD) {
+		long n = 8*l->u.field->type->size - fieldsize(l->u.field);
+		if (n > 0 && isunsigned(l->u.field->type))
+			r = bittree(BAND, r,
+				cnsttree(r->type, (unsigned long)fieldmask(l->u.field)));
+		else if (n > 0) {
+			if (r->op == CNST+I) {
+				n = r->u.v.i;
+				if (n&(1<<(fieldsize(l->u.field)-1)))
+					n |= ~0UL<<fieldsize(l->u.field);
+				r = cnsttree(r->type, n);
+			} else
+				r = shtree(RSH,
+					shtree(LSH, r, cnsttree(inttype, n)),
+					cnsttree(inttype, n));
+		}
+	}
+	if (isstruct(ty) && isaddrop(l->op) && iscallb(r))
+		return tree(RIGHT, ty,
+			tree(CALL+B, ty, r->kids[0]->kids[0], l),
+			idtree(l->u.sym));
+	return tree(mkop(op,ty), ty, l, r);
+}
+Tree condtree(Tree e, Tree l, Tree r) {
+	Symbol t1;
+	Type ty, xty = l->type, yty = r->type;
+	Tree p;
+
+	if (isarith(xty) && isarith(yty))
+		ty = binary(xty, yty);
+	else if (eqtype(xty, yty, 1))
+		ty = unqual(xty);
+	else if (isptr(xty)   && isnullptr(r))
+		ty = xty;
+	else if (isnullptr(l) && isptr(yty))
+		ty = yty;
+	else if ((isptr(xty) && !isfunc(xty->type) && isvoidptr(yty))
+	||       (isptr(yty) && !isfunc(yty->type) && isvoidptr(xty)))
+		ty = voidptype;
+	else if ((isptr(xty) && isptr(yty)
+		 && eqtype(unqual(xty->type), unqual(yty->type), 1)))
+		ty = xty;
+	else {
+		typeerror(COND, l, r);
+		return consttree(0, inttype);
+	}
+	if (isptr(ty)) {
+		ty = unqual(unqual(ty)->type);
+		if ((isptr(xty) && isconst(unqual(xty)->type))
+		||  (isptr(yty) && isconst(unqual(yty)->type)))
+			ty = qual(CONST, ty);
+		if ((isptr(xty) && isvolatile(unqual(xty)->type))
+		||  (isptr(yty) && isvolatile(unqual(yty)->type)))
+			ty = qual(VOLATILE, ty);
+		ty = ptr(ty);
+	}
+	switch (e->op) {
+	case CNST+I: return cast(e->u.v.i != 0   ? l : r, ty);
+	case CNST+U: return cast(e->u.v.u != 0   ? l : r, ty);
+	case CNST+P: return cast(e->u.v.p != 0   ? l : r, ty);
+	case CNST+F: return cast(e->u.v.d != 0.0 ? l : r, ty);
+	}
+	if (ty != voidtype && ty->size > 0) {
+		t1 = genident(REGISTER, unqual(ty), level);
+	/*	t1 = temporary(REGISTER, unqual(ty)); */
+		l = asgn(t1, l);
+		r = asgn(t1, r);
+	} else
+		t1 = NULL;
+	p = tree(COND, ty, cond(e),
+		tree(RIGHT, ty, root(l), root(r)));
+	p->u.sym = t1;
+	return p;
+}
+/* addrof - address of p */
+Tree addrof(Tree p) {
+	Tree q = p;
+
+	for (;;)
+		switch (generic(q->op)) {
+		case RIGHT:
+			assert(q->kids[0] || q->kids[1]);
+			q = q->kids[1] ? q->kids[1] : q->kids[0];
+			continue;
+		case ASGN:
+			q = q->kids[1];
+			continue;
+		case COND: {
+			Symbol t1 = q->u.sym;
+			q->u.sym = 0;
+			q = idtree(t1);
+			/* fall thru */
+			}
+		case INDIR:
+			if (p == q)
+				return q->kids[0];
+			q = q->kids[0];
+			return tree(RIGHT, q->type, root(p), q);
+		default:
+			error("addressable object required\n");
+			return value(p);
+		}
+}
+
+/* andtree - construct tree for l [&& ||] r */
+static Tree andtree(int op, Tree l, Tree r) {
+	if (!isscalar(l->type) || !isscalar(r->type))
+		typeerror(op, l, r);
+	return simplify(op, inttype, cond(l), cond(r));
+}
+
+/* asgn - generate tree for assignment of expr e to symbol p sans qualifiers */
+Tree asgn(Symbol p, Tree e) {
+	if (isarray(p->type))
+		e = tree(ASGN+B, p->type, idtree(p),
+			tree(INDIR+B, e->type, e, NULL));
+	else {
+		Type ty = p->type;
+		p->type = unqual(p->type);
+		if (isstruct(p->type) && p->type->u.sym->u.s.cfields) {
+			p->type->u.sym->u.s.cfields = 0;
+			e = asgntree(ASGN, idtree(p), e);
+			p->type->u.sym->u.s.cfields = 1;
+		} else
+			e = asgntree(ASGN, idtree(p), e);
+		p->type = ty;
+	}
+	return e;
+}
+
+/* bittree - construct tree for l [& | ^ %] r */
+Tree bittree(int op, Tree l, Tree r) {
+	Type ty = inttype;
+
+	if (isint(l->type) && isint(r->type)) {
+ 		ty = binary(l->type, r->type);
+		l = cast(l, ty);
+		r = cast(r, ty);		
+	} else
+		typeerror(op, l, r);
+	return simplify(op, ty, l, r);
+}
+
+/* multree - construct tree for l [* /] r */
+static Tree multree(int op, Tree l, Tree r) {
+	Type ty = inttype;
+
+	if (isarith(l->type) && isarith(r->type)) {
+		ty = binary(l->type, r->type);
+		l = cast(l, ty);
+		r = cast(r, ty);		
+	} else
+		typeerror(op, l, r);
+	return simplify(op, ty, l, r);
+}
+
+/* shtree - construct tree for l [>> <<] r */
+Tree shtree(int op, Tree l, Tree r) {
+	Type ty = inttype;
+
+	if (isint(l->type) && isint(r->type)) {
+		ty = promote(l->type);
+		l = cast(l, ty);
+		r = cast(r, inttype);
+	} else
+		typeerror(op, l, r);
+	return simplify(op, ty, l, r);
+}
+
+/* subtree - construct tree for l - r */
+static Tree subtree(int op, Tree l, Tree r) {
+	long n;
+	Type ty = inttype;
+
+	if (isarith(l->type) && isarith(r->type)) {
+		ty = binary(l->type, r->type);
+		l = cast(l, ty);
+		r = cast(r, ty);		
+	} else if (isptr(l->type) && !isfunc(l->type->type) && isint(r->type)) {
+		ty = unqual(l->type);
+		n = unqual(ty->type)->size;
+		if (n == 0)
+			error("unknown size for type `%t'\n", ty->type);
+		r = cast(r, promote(r->type));
+		if (n > 1)
+			r = multree(MUL, cnsttree(signedptr, n), r);
+		if (isunsigned(r->type))
+			r = cast(r, unsignedptr);
+		else
+			r = cast(r, signedptr);
+		return simplify(SUB+P, ty, l, r);
+	} else if (compatible(l->type, r->type)) {
+		ty = unqual(l->type);
+		n = unqual(ty->type)->size;
+		if (n == 0)
+			error("unknown size for type `%t'\n", ty->type);
+		l = simplify(SUB+U, unsignedptr,
+			cast(l, unsignedptr), cast(r, unsignedptr));
+		return simplify(DIV+I, longtype,
+			cast(l, longtype), cnsttree(longtype, n));
+	} else
+		typeerror(op, l, r);
+	return simplify(op, ty, l, r);
+}
+
+/* typeerror - issue "operands of op have illegal types `l' and `r'" */
+void typeerror(int op, Tree l, Tree r) {
+	int i;
+	static struct { int op; char *name; } ops[] = {
+		{ASGN, "="},	{INDIR, "*"},	{NEG,  "-"},
+		{ADD,  "+"},	{SUB,   "-"},	{LSH,  "<<"},
+		{MOD,  "%"},	{RSH,   ">>"},	{BAND, "&"},
+		{BCOM, "~"},	{BOR,   "|"},	{BXOR, "^"},
+		{DIV,  "/"},	{MUL,   "*"},	{EQ,   "=="},
+		{GE,   ">="},	{GT,    ">"},	{LE,   "<="},
+		{LT,   "<"},	{NE,    "!="},	{AND,  "&&"},
+		{NOT,  "!"},	{OR,    "||"},	{COND, "?:"},
+		{0, 0}
+	};
+
+	op = generic(op);
+	for (i = 0; ops[i].op; i++)
+		if (op == ops[i].op)
+			break;
+	assert(ops[i].name);
+	if (r)
+		error("operands of %s have illegal types `%t' and `%t'\n",
+			ops[i].name, l->type, r->type);
+	else
+		error("operand of unary %s has illegal type `%t'\n", ops[i].name,
+			l->type);
+}