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print.c
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print.c
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/*ident "@(#)cls4:src/print.c 1.21" */
/*******************************************************************************
C++ source for the C++ Language System, Release 3.0. This product
is a new release of the original cfront developed in the computer
science research center of AT&T Bell Laboratories.
Copyright (c) 1993 UNIX System Laboratories, Inc.
Copyright (c) 1991, 1992 AT&T and UNIX System Laboratories, Inc.
Copyright (c) 1984, 1989, 1990 AT&T. All Rights Reserved.
THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE of AT&T and UNIX System
Laboratories, Inc. The copyright notice above does not evidence
any actual or intended publication of such source code.
print.c:
print statements and expressions
****************************************************************************/
#include "cfront.h"
static int addrof_cm;
extern void puttok(TOK);
#define eprint(e) \
if (e) \
Eprint(e)
static long lab_cnt = 0;
static long curr_lab = 0;
void Eprint(Pexpr e) {
switch (e->base) {
case DOT:
case REF:
if (Pref(e)->mem && Pref(e)->mem->tp
&& Pref(e)->mem->tp->base == FCT) { // suppress ``this'' in ``this->f''
Pref(e)->mem->print();
break;
}
case NAME:
case MDOT:
case ID:
case ZERO:
case ICON:
case CCON:
case FCON:
case STRING:
case IVAL:
case TEXT:
case CM:
case G_CM:
case ELIST:
case COLON:
case ILIST:
case THIS:
case CALL:
case G_CALL:
case ICALL:
case ANAME:
e->print();
break;
case DTOR: // dummy type destructor
error('i', "T destructor in %cprint()", 'E');
case DUMMY: // null or error
break;
default:
putch('(');
e->print();
putch(')');
}
}
void expr::print() {
if (this == 0)
error('i', "0->E::print()");
if ((this == e1 || this == e2) && base != NAME)
error('i', "(%p%k)->E::print(%p %p)", this, base, e1, e2);
// error('d',"(%d %k)->expr::print(%d %d)",this,base,e1,e2);
switch (base) {
case MDOT: {
// error('d',"mdot %s i1 %d %t",string2,i1,mem->tp);
int not_allocated = 0;
switch (i1) {
case 0:
putcat('O', string2);
puttok(DOT); // use sub-object directly
mem->print();
break;
case 1:
putcat('P', string2);
puttok(REF); // use through pointer
mem->print();
break;
case 2:
if (mem->tp->is_ptr_or_ref() == 0) {
mem->print();
puttok(DOT);
putcat('O', string2);
} else {
putch('('); // REF turns pointer into object: add &
putch('&'); // ``this'' is a pointer
putch('(');
eprint(mem);
puttok(REF); // call sub-object directly
putcat('O', string2);
putch(')');
putch(')');
}
break;
case 5:
not_allocated = 1;
// no break;
case 3:
if (mem->tp->is_ptr_or_ref() == 0) {
putch('('); // Px is a pointer (T*) turn it back to a T
putch('*'); // *Px
putch('(');
eprint(mem); // mem->print();
puttok(DOT); // call through pointer
putcat('P', string2);
putch(')');
putch(')');
} else {
TOK m = mem->base;
if (m == ADDROF || m == G_ADDROF) {
if (mem->e2->base == DEREF && !mem->e2->e2)
m = mem->e2->e1->base;
}
if (not_allocated) {
putch('(');
mem->print();
if (m == NAME || m == ANAME || m == REF)
puttok(REF);
else
puttok(DOT);
putcat('O', string4);
putch(')');
} else
eprint(mem);
if ((m == NAME || m == ANAME || m == REF) && not_allocated)
puttok(DOT);
else
puttok(REF); // call through pointer
putcat('P', string2);
}
break;
case 9: // vtbl entry: (p->_vtbl).f, (p->_vtbl).i, (p->_vtbl).d
// or memptr: mp.f, mp.i, mp.d
eprint(mem);
putch('.');
putstring(string2);
} // end switch(i1)
break;
} // end MDOT
case NAME: {
Pname n = Pname(this);
if (n->n_evaluated && n->n_scope != ARG) {
Ptype t = tp->skiptypedefs();
if (t->base == EOBJ)
t = Penum(Pbase(t)->b_name->tp)->e_type;
if (t->base != INT || t->is_unsigned()) {
putstring("((");
bit oc = Cast;
Cast = 1;
t->print();
Cast = oc;
fprintf(out_file, ")%d)", n->n_val);
} else
fprintf(out_file, "%d", n->n_val);
} else
n->print();
break;
}
case ANAME:
if (curr_icall) { // in expansion: look it up
Pname n = Pname(this);
int argno = n->argno;
for (Pin il = curr_icall; il; il = il->i_next)
if (n->n_table == il->i_table)
goto aok;
goto bok;
aok:
if (n = il->i_args[argno].local) {
n->print();
} else {
Pexpr ee = il->i_args[argno].arg;
Ptype t = il->i_args[argno].tp;
if (ee == 0 || ee == this)
error('i', "%p->E::print(A %p)", this, ee);
if (ee->tp == 0 || (t != ee->tp && t->check(ee->tp, 0) && t->is_cl_obj() == 0)) {
putstring("((");
bit oc = Cast;
Cast = 1;
t->print();
Cast = oc;
putch(')');
eprint(ee);
putch(')');
} else
eprint(ee);
}
} else {
bok: /* in body: print it: */
Pname(this)->print();
}
break;
case ICALL: {
if (il == 0)
error('i', "E::print: iline missing");
il->i_next = curr_icall;
curr_icall = il;
// error('d',"icall %n",il->fct_name);
eprint(e1);
if (e2) {
long save = curr_lab;
curr_lab = ++lab_cnt;
Pstmt(e2)->print();
curr_lab = save;
}
curr_icall = il->i_next;
break;
}
case REF:
case DOT:
eprint(e1);
puttok(base);
if (mem == 0) {
fprintf(out_file, "MEM0");
break;
}
if (mem->base == NAME)
Pname(mem)->print();
else
mem->print();
break;
case MEMPTR:
error("P toMF not called");
break;
case VALUE:
tp2->print();
puttok(LP);
if (e1)
e1->print();
puttok(RP);
break;
case SIZEOF:
puttok(SIZEOF);
if (e1 && e1 != dummy && e1->base != ILIST
&& ((e1->base != CAST && e1->base != G_CAST) || e1->e1->base != ILIST)) {
eprint(e1);
} else if (tp2) {
putch('(');
if (tp2->base == CLASS) {
Pclass cl = Pclass(tp2);
putstring((cl->csu == UNION) ? "union " : "struct ");
char *str = 0;
// nested local class does not encode name
if (cl->lex_level && cl->nested_sig == 0)
str = cl->local_sig;
// putstring(str?str:(cl->nested_sig?cl->nested_sig:cl->string));
if (str)
putstring(str);
else if (cl->nested_sig)
fprintf(out_file, "__%s", cl->nested_sig);
else
putstring(cl->string);
} else
tp2->print();
putch(')');
} else {
error('i', "missingE for sizeof");
}
break;
case CAST:
case G_CAST:
if (e1->base == ILIST) {
eprint(e1);
break;
}
putch('(');
// error('d',"print cast %t",tp2);
if (tp2 != mptr_type && (tp2->base != VOID || ansi_opt) && tp2->memptr() == 0) {
// when VOID is represented as CHAR not everything
// can be cast to VOID
putch('(');
bit oc = Cast;
Cast = 1;
if (tp2->base == TYPE || tp2->base == VEC)
TCast = 1;
else
TCast = 0;
tp2->print();
TCast = 0;
Cast = oc;
putch(')');
}
eprint(e1);
putch(')');
break;
case ICON:
case FCON:
case CCON:
case ID:
if (string)
putst(string);
break;
case STRING:
// avoid printing very long lines
ntok += 4;
fprintf(out_file, "\"%s\"", string);
break;
case THIS:
case ZERO:
putstring("0 ");
break;
case IVAL:
fprintf(out_file, "%d", i1);
break;
case TEXT: {
int oo = vtbl_opt; // make `simulated static' name
vtbl_opt = -1;
char *s = vtbl_name(string, string2);
vtbl_opt = oo;
s[2] = 'p'; // pointer, not tbl itself
char *t = ptbl_lookup(s);
fprintf(out_file, " %s", t);
delete t;
char *str = 0;
if (string) {
str = new char[strlen(string) + strlen(string2) + 1];
strcpy(str, string);
strcat(str, string2);
}
if (ptbl->look(str ? str : string2, 0) == 0
&& ptbl->look(str ? str : string2, HIDDEN) == 0) {
Pname nn = ptbl->insert(new name(str ? str : string2), 0);
nn->string2 = new char[strlen(s) + 1];
strcpy(nn->string2, s);
}
delete str;
delete s;
} break;
case DTOR: // dummy type destructor
error('i', "T destructor in expr::print()");
case DUMMY: // null or error
break;
case G_CALL:
case CALL: {
Pname fn = fct_name;
Pname at;
int m_ptr = 0;
int comflag = 0;
if (fn) {
Pfct f = Pfct(fn->tp);
if (f->base == OVERLOAD) { // overloaded after call
fct_name = fn = Pgen(f)->fct_list->f;
f = Pfct(fn->tp);
}
if (e1->base == CM || e1->base == G_CM) {
comflag = 1;
puttok(LP);
e1->e1->print();
puttok(CM);
}
fn->print();
at = f->f_args;
} else {
Pfct f = Pfct(e1->tp);
if (f) { // pointer to fct
Pexpr exex = e1;
if (exex->base == DEREF) {
exex = exex->e1;
while (exex->base == CAST || exex->base == G_CAST)
exex = exex->e1;
if (exex->base == MDOT)
m_ptr = 1;
}
if (f->base == OVERLOAD) { // overloaded after call
fct_name = fn = Pgen(f)->fct_list->f;
f = Pfct(fn->tp);
}
f = Pfct(f->skiptypedefs());
if (f->base == PTR) {
putstring("(*(");
e1->print();
putstring("))");
f = Pfct(Pptr(f)->typ->skiptypedefs());
} else
eprint(e1);
at = f->f_args;
} else { // virtual: argtype encoded
// f_this already linked to f_result and/or argtype
at = (e1->base == QUEST) ? Pname(e1->e1->tp2) : Pname(e1->tp2);
eprint(e1);
}
}
puttok(LP);
if (e2) {
if (at) {
Pexpr e = e2;
while (at) {
Pexpr ex;
Ptype t = at->tp;
if (t == 0)
error('i', "T ofA missing for%n", fn);
if (e == 0)
error('i', "%tA missing for%n", t, fn);
if (e->base == ELIST) {
ex = e->e1;
e = e->e2;
} else
ex = e;
if (ex == 0)
error('i', "A ofT%t missing", t);
if (t != ex->tp && ex->tp && t->check(ex->tp, 0) && t->is_cl_obj() == 0
&& eobj == 0 && m_ptr == 0 && (t->is_ptr() == 0 || Mptr == 0)) {
putch('(');
bit oc = Cast;
Cast = 1;
t->print();
Cast = oc;
putch(')');
#ifdef sun
if (ex->base == DIV) { // defend against perverse SUN cc bug
putstring("(0+");
eprint(ex);
putch(')');
} else {
#endif
if (ex->tp->is_cl_obj()
&& ((ex->base != NAME && ex->base != ANAME)
|| Pname(ex)->n_xref == 0)
&& // beware of reference arguments
(t->is_ptr() || t->is_ref())) {
// trying to cast a class object to its pointer type
// add `&' to compensate from use of constructor call
// rewritten to use temporaty in ?: expression.
// error('d',"t %t ex->tp %t",t,ex->tp);
ex = ex->address();
}
eprint(ex);
#ifdef sun
}
#endif
} else
ex->print();
// if m_ptr is set, then don't advance at
// at does not know about generated `this'
if (m_ptr) {
m_ptr = 0;
if (at)
puttok(CM);
continue;
}
at = at->n_list;
if (at)
puttok(CM);
}
if (e) {
puttok(CM);
e->print();
}
} else
e2->print();
}
puttok(RP);
if (comflag)
puttok(RP);
break;
}
case ASSIGN:
if (e1->base == ANAME
&& Pname(e1)->n_assigned_to == FUDGE111) { // suppress assignment to "this"
// that has been optimized away
Pname n = Pname(e1);
int argno = int(n->n_val);
for (Pin il = curr_icall; il; il = il->i_next)
if (il->i_table == n->n_table)
goto akk;
goto bkk;
akk:
if (il->i_args[argno].local == 0) {
e2->print();
break;
}
}
// no break
case EQ:
case NE:
case GT:
case GE:
case LE:
case LT:
bkk : {
eprint(e1);
puttok(base);
if (e1->tp && e1->tp != e2->tp && e2->base != ZERO) { // cast, but beware of int!=long etc.
Ptype t1 = e1->tp->skiptypedefs();
switch (t1->base) {
default:
break;
case PTR:
case RPTR:
case VEC: {
Ptype t2 = e2->tp->skiptypedefs();
if (e2->tp == 0
|| (!ansi_opt && Pptr(t1)->typ && Pptr(t1)->typ->skiptypedefs()->base == VEC
&& e2->base != G_CAST && e2->base != CAST)
|| (Pptr(t1)->typ != Pptr(t2)->typ && t1->check(t2, 0)
&& (t1->memptr() == 0 || t2->memptr() == 0 || t1->check(t2, COERCE)))) {
putch('(');
bit oc = Cast;
Cast = 1;
e1->tp->print();
Cast = oc;
putch(')');
}
}
}
}
eprint(e2);
break;
}
case DEREF:
if (e2) {
eprint(e1);
putch('[');
eprint(e2);
putch(']');
} else {
putch('(');
putch('*');
eprint(e1);
putch(')');
}
break;
case ILIST: {
static int level = 0;
level++;
bit flag = (level > 1 && tp && (tp == zero_type || tp->memptr()));
if (!flag)
puttok(LC);
if (e1)
e1->print();
if (e2) { // member pointer initiliazers
puttok(CM);
e2->print();
}
if (!flag)
puttok(RC);
level--;
break;
}
case ELIST: {
Pexpr e = this;
for (;;) {
if (e->base == ELIST) {
e->e1->print();
if (e = e->e2) {
puttok(CM);
} else
return;
} else {
e->print();
return;
}
}
}
case QUEST: { // look for (&a == 0) etc.
Neval = 0;
binary_val = 1;
long i = cond->eval();
binary_val = 0;
if (Neval == 0)
(i ? e1 : e2)->print();
else {
eprint(cond);
putch('?');
if (!ansi_opt) {
if ((e1->base == CAST || e1->base == G_CAST) && e1->tp
&& !e1->tp->check(void_type, 0)) {
e1 = new expr(G_CM, e1->e1, zero);
e1->tp = zero_type;
}
if ((e2->base == CAST || e2->base == G_CAST) && e2->tp
&& !e2->tp->check(void_type, 0)) {
e2 = new expr(G_CM, e2->e1, zero);
e2->tp = zero_type;
}
}
eprint(e1);
putch(':');
eprint(e2);
}
break;
}
case CM: // do &(a,b) => (a,&b) for previously checked inlines
case G_CM:
puttok(LP);
switch (e1->base) {
case ZERO:
case IVAL:
case ICON:
case NAME:
case DUMMY:
case MDOT:
case DOT:
case REF:
case FCON:
case STRING:
goto le2; // suppress constant a: &(a,b) => (&b)
case DTOR:
error('i', "T destructor in expr::print()");
default: {
int oo = addrof_cm; // &(a,b) does not affect a
addrof_cm = 0;
eprint(e1);
addrof_cm = oo;
}
puttok(CM);
le2:
if (addrof_cm) {
switch (e2->base) {
case CAST:
case G_CAST:
if (e2->e2)
switch (e2->e2->base) {
case CM:
case G_CM:
case ICALL:
goto ec;
}
case NAME:
case MDOT:
case DOT:
case DEREF:
case REF:
case ANAME:
if (e2->base != ADDROF && e2->base != G_ADDROF)
puttok(ADDROF);
addrof_cm--;
eprint(e2);
addrof_cm++;
break;
case ICALL:
case CM:
case G_CM:
ec:
eprint(e2);
break;
case G_CALL:
/* & ( e, ctor() ) with temporary optimized away */
if (e2->fct_name && e2->fct_name->n_oper == CTOR) {
addrof_cm--;
eprint(e2);
addrof_cm++;
break;
}
default:
error('i', "& inlineF call (%k)", e2->base);
}
} else
eprint(e2);
puttok(RP);
}
break;
case ADDROF:
case G_ADDROF: {
switch (e2->base) { // & *e1 or &e1[e2]
case DEREF:
if (e2->e2 == 0) { // &*e == e
e2->e1->print();
return;
}
break;
case ICALL:
addrof_cm++; // assumes inline expanded into ,-expression
eprint(e2);
addrof_cm--;
return;
case ASSIGN: // &(a=b) ??? works on many cc s
eprint(e2); // make sure it breaks!
return;
case ANAME:
case NAME: {
Pname n = Pname(e2);
if (n->n_evaluated) {
n->n_evaluated = 0;
if (e2->base != ADDROF && e2->base != G_ADDROF)
puttok(ADDROF);
eprint(e2);
n->n_evaluated = 1;
return;
}
if ((e2->tp) && (e2->tp->is_cl_obj()) && n->n_xref) {
eprint(e2);
return;
}
if (!ansi_opt && (e2->tp && e2->tp->skiptypedefs()->base == VEC)) {
// no "ADDROF" ('&') if not ANSI C generation.
eprint(e2);
return;
}
break;
}
}
// suppress cc warning on &fct
if ((e2->base != ADDROF && e2->base != G_ADDROF)
&& (e2->tp == 0 || (e2->tp->base != FCT && e2->tp->base != OVERLOAD)))
puttok(ADDROF);
if (e2->tp && e2->tp->base == OVERLOAD)
e2->tp = Pfct((Pgen(e2->tp)->fct_list->f)->tp);
eprint(e2);
} break;
case PLUS:
case MINUS:
case MUL:
case DIV:
case MOD:
case LS:
case RS:
case AND:
case OR:
case ER:
case ANDAND:
case OROR:
case DECR:
case INCR:
case ASOR:
case ASER:
case ASAND:
case ASPLUS:
case ASMINUS:
case ASMUL:
case ASMOD:
case ASDIV:
case ASLS:
case ASRS:
eprint(e1);
// no break
case UPLUS: // only preserved for ansi_opt==1
case UMINUS:
case NOT:
case COMPL:
puttok(base);
eprint(e2);
break;
default:
error('i', "%p->E::print%k", this, base);
}
}
Pexpr aval(Pname a) {
int argno = a->argno;
Pin il;
for (il = curr_icall; il; il = il->i_next)
if (il->i_table == a->n_table)
goto aok;
return 0;
aok:
Pexpr aa = il->i_args[argno].arg;
ll:
switch (aa->base) {
case G_CAST:
case CAST:
aa = aa->e1;
goto ll;
case ANAME:
return aval(Pname(aa));
default:
return aa;
}
}
static void reprint(Plist ll)
/* prints a name list in reverse order */
{
if (ll->l)
reprint(ll->l);
ll->f->dcl_print(0);
}
#define putcond(e) \
putch('('); \
e->print(); \
putch(')')
static loc csloc = { 0, 0 }; // loc of last stmt with line!=0
void stmt::print() {
// error('d',"S::print %d:%k s %d s_list %d",this,base,s,s_list);
if (where.line == 0) {
if (csloc.line)
csloc.putline();
} else {
csloc = where;
if (where.line != last_line.line)
if (last_ll = where.line)
where.putline();
else
last_line.putline();
}
if (memtbl && base != BLOCK) { /* also print declarations of temporaries */
puttok(LC);
Ptable tbl = memtbl;
memtbl = 0;
int i;
int bl = 1;
for (Pname n = tbl->get_mem(i = 1); n; NEXT_NAME(tbl, n, i)) {
if (n->tp == any_type)
continue;
/* avoid double declarartion of temporaries from inlines */
char *s = n->string;
if (s[0] != '_' || s[1] != '_' || s[2] != 'X') {
n->dcl_print(0);
bl = 0;
}
Pname cn;
if (bl && (cn = n->tp->is_cl_obj()) && Pclass(cn->tp)->has_dtor())
bl = 0;
}
if (last_ll == 0 && (last_ll = where.line))
where.putline();
if (bl) {
Pstmt sl = s_list;
s_list = 0;
print();
memtbl = tbl;
puttok(RC);
if (sl) {
s_list = sl;
sl->print();
}
} else {
print();
memtbl = tbl;
puttok(RC);
}
return;
}
switch (base) {
default:
error('i', "S::print(base=%k)", base);
case ASM:
fprintf(out_file, "asm(\"%s\");\n", (char *) e);
break;
case DCL:
d->dcl_print(SM);
break;
case BREAK:
case CONTINUE:
puttok(base);
puttok(SM);
break;
case DEFAULT:
puttok(base);
putch(':');
s->print();
break;
case SM: {
Pexpr ee = e;
while (ee && (ee->base == CAST || ee->base == G_CAST))
ee = ee->e1;
if (ee && ee->base == ILIST) {
puttok(SM);
break;
}
if (e) {
DB(if (Pdebug >= 4) display_expr(e, "SM_e"););
e->print();
if (e->base == ICALL && e->e2)
break; /* a block: no SM */
}
puttok(SM);
break;
}
case WHILE:
puttok(WHILE);
putcond(e);
if (s->s_list) {
puttok(LC);
s->print();
puttok(RC);
} else
s->print();
break;
case DO:
puttok(DO);
s->print();
puttok(WHILE);
putcond(e);
puttok(SM);
break;
case SWITCH:
puttok(SWITCH);
putcond(e);
s->print();
break;
case RETURN:
if (gt) {
gt->print();
break;
}
puttok(RETURN);
if (e) {
// error('d',"print return rt %t etp %t",ret_tp,e->tp);
if (ret_tp && ret_tp != e->tp) {
Ptype tt = ret_tp->skiptypedefs();
switch (tt->base) {
case COBJ:
break; // cannot cast to struct
case RPTR:
case PTR:
if (Pptr(tt)->typ == Pptr(e->tp)->typ)
break;
if (Pptr(tt)->memof)
break;
default:
if (e->tp == 0 || ret_tp->check(e->tp, 0)) {
int oc = Cast;
putch('(');
Cast = 1;
ret_tp->print();
Cast = oc;
putch(')');
}
}
}
eprint(e);
}
puttok(SM);
while (s_list && s_list->base == SM)
s_list = s_list->s_list; // FUDGE!!