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dcl4.c
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dcl4.c
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/*ident "@(#)cls4:src/dcl4.c 1.38" */
/*******************************************************************************
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THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE of AT&T and UNIX System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.
dcl4.c:
Declaration of class and enum
*************************************************************************/
#include "cfront.h"
#include "size.h"
#include "template.h"
static Pname get_vf(Pname n_pvf, Pclass cl) {
/*----------------------------------------------------------------------------
search the base hierarchy of class "cl" if n_pvf (Name of Pure Virtual
Function) has a definition.
returns 0 if no definition found in the hierarchy.
returns Pname if found.
*----------------------------------------------------------------------------
*/
if (!n_pvf || !cl)
return 0;
if (n_pvf->tp && !cl->has_base(Pfct(n_pvf->tp)->memof)) {
return 0; // if pvf is not in a base of "cl"
}
Pname n_vf = cl->memtbl->look(n_pvf->string, 0);
if (n_vf && n_pvf->tp && n_vf->tp) {
if (n_vf->tp->base == OVERLOAD) {
for (Plist gl = Pgen(n_vf->tp)->fct_list; gl; gl = gl->l) {
if (!Pfct(n_pvf->tp)->check(gl->f->tp, VIRTUAL))
break;
}
if (!gl)
n_vf = 0;
} else {
if (Pfct(n_pvf->tp)->check(Pfct(n_vf->tp), VIRTUAL))
n_vf = 0;
}
}
// error('d',"get_vf %n in %t for pure virt. %n",n_vf, cl, n_pvf);
if (n_vf == 0) {
for (Pbcl b = cl->baselist; b; b = b->next) {
if (b->base == NAME || b->base == VIRTUAL) {
n_vf = get_vf(n_pvf, b->bclass);
if (n_vf && !n_vf->n_initializer) {
break;
} else {
n_vf = 0;
}
}
} // for (Pbcl b=...
} // if (n_vf==0)
return n_vf;
}
Pname find_vptr(Pclass);
void fix_args(Pfct f, Pclass cl)
/*
This function is used to cope with the case where cl::cl(cl&) is
declared AFTER f has been declared
set n_xref bit for f
*/
{
for (Pname a = f->argtype; a; a = a->n_list) {
Pname n = a->tp->is_cl_obj();
if (n && same_class(Pclass(n->tp), cl))
a->n_xref = 1;
}
}
struct typedef_info {
Pname n;
typedef_info *next;
};
static typedef_info *typedef_info_head = 0, *typedef_info_tail = 0;
static Pfct get_fct_node(Pname n) {
Ptype t = n->tp ? n->tp->skiptypedefs() : 0;
if (t && t->base == RPTR)
t = Pptr(t)->typ->skiptypedefs();
while (t && t->base == PTR)
t = Pptr(t)->typ->skiptypedefs();
return t && t->base == FCT ? Pfct(t) : 0;
}
static void record_typedef(Pname tn) {
typedef_info *p = new typedef_info;
p->n = tn;
if (typedef_info_head == 0) {
typedef_info_head = typedef_info_tail = p;
} else {
typedef_info_tail->next = p;
typedef_info_tail = p;
}
}
void typedef_check(Pname n) {
Pname cn;
Pfct f = get_fct_node(n);
if (!f)
return;
for (Pname a = f->argtype; a; a = a->n_list) {
cn = a->tp ? a->tp->is_cl_obj() : 0;
if (!a->n_xref && cn && cn->tp && !(Pclass(cn->tp)->defined & DEFINED)) {
record_typedef(n);
return;
}
}
cn = f->returns ? f->returns->is_cl_obj() : 0;
if ((!f->s_returns || f->s_returns != void_type) && cn && cn->tp
&& !(Pclass(cn->tp)->defined & DEFINED))
record_typedef(n);
}
static void typedef_checkall(Pclass cl) {
for (typedef_info *p = typedef_info_head; p; p = p->next) {
Pfct f = get_fct_node(p->n);
Pname cn;
for (Pname a = f->argtype; a; a = a->n_list) {
cn = a->tp ? a->tp->is_cl_obj() : 0;
if (!a->n_xref && cn && cn->tp && same_class(Pclass(cn->tp), cl) && cl->has_itor()) {
error('s', &p->n->where,
"C%t used asAT inTdef%n before it was known that%t has a copyK", cl, p->n, cl);
break;
}
}
cn = f->returns ? f->returns->is_cl_obj() : 0;
if ((!f->s_returns || f->s_returns != void_type) && cn && cn->tp
&& same_class(Pclass(cn->tp), cl) && cl->has_itor())
error('s', &p->n->where,
"C%t used as returnT inTdef%n before it was known that%t has a copyK", cl, p->n, cl);
}
}
Pname merge_conv(Pname c1, Pname c2) {
if (c1 == 0)
return c2;
if (c2 == 0)
return c1;
if (c1 == c2)
return c1;
error('s', "cannot merge lists of conversion functions");
return c1;
}
static int Eppp;
char *get_classname(char *s)
/*
retrieve the outermost class name in a vtable name
*/
{
// error('d',"get_classname(%s)",s);
char *s1 = 0;
while (*s) {
s1 = s;
loop:
for (; s[0] && (s[0] != '_' || s[1] && s[1] != '_'); s++)
;
if (*s) {
if (strncmp(s, "___pt__", 7) == 0) {
s += 7;
goto loop;
}
if (strncmp(s, "__pt__", 6) == 0) { // parameterized class
s += 6;
goto loop;
}
if (s[1] == 0)
++s;
else
s += 2; // bypass "__"
}
}
return s1;
}
char *drop_classname(char *s)
/*
retrieve all but the outermost class name in a vtable name
*/
{
// error('d',"drop_classname(%s)",s);
char *r = new char[strlen(s) + 1];
sprintf(r, s);
s = r;
char *s1 = s;
while (*s) {
loop:
for (; s[0] && (s[0] != '_' || s[1] && s[1] != '_'); s++)
;
if (*s) {
if (strncmp(s, "___pt__", 7) == 0) {
s += 7;
goto loop;
}
if (strncmp(s, "__pt__", 6) == 0) { // parameterized class
s += 6;
goto loop;
}
if (s[1] == 0) {
s1 = ++s;
break;
}
s1 = s;
s += 2; // bypass "__"
}
}
*s1 = '\0';
return (*r) ? r : 0;
}
bit classdef::has_const_mem()
/*
does this class have any constant members
*/
{
int i;
for (Pname m = memtbl->get_mem(i = 1); m; NEXT_NAME(memtbl, m, i))
if (m && m->tp)
switch (m->tp->base) {
case FCT:
break;
case OVERLOAD:
break;
case EOBJ:
break;
default:
if (m->tp->is_const_object() && m->n_stclass != STATIC)
return 1;
}
return 0;
}
Pbcl classdef::get_base(char *s)
/*
Find the base class whose name matches the argument
*/
{
// error('d',"%t::get_base(%s) baselist%d %t",this,s,this?baselist:0,this?baselist->bclass:0);
for (Pbcl b = baselist; b; b = b->next) {
// error('d'," b%t s %s",b->bclass,s);
for (char *s1 = s, *s2 = b->bclass->string; *s1 && *s2 && *s1 == *s2; s1++, s2++)
;
if (!(*s1 || *s2))
break;
}
return b;
}
static int offset_magic_0(Pbcl b, Pbcl bb, short virt_count) {
// error('d',"offset_magic_0(%t %t %d)", b->bclass,bb->bclass,virt_count);
Pclass bcl = bb->bclass;
int offset = 0;
for (Pbcl l = b; l; l = l->next) {
if (l->base == VIRTUAL)
continue;
Pclass bc = l->bclass;
for (Pbcl ll = bc->baselist; ll; ll = ll->next) {
if (ll->base != VIRTUAL)
continue;
int diff = strcmp(bcl->string, ll->bclass->string);
// if (ll->allocated && !diff) {
if (ll->allocated == 1 && !diff) {
offset = ll->obj_offset + l->obj_offset;
// error('d',"%d offset_magic_0 returning found offset of %t",offset, bcl);
return offset;
}
// if (diff && ll->allocated) {
if (diff && ll->allocated == 1) {
offset = ll->bclass->has_allocated_base(bcl);
if (offset) {
if (!virt_count)
offset += l->obj_offset;
// error('d',"%d offset_magic_0 returning allocated offset of %t",offset, bcl);
return offset;
}
}
}
}
if (Nvbc_alloc) {
offset = bb->obj_offset - Nvbc_alloc->obj_offset;
if (virt_count)
offset += 4;
// error('d',"nvbc: %t %d bb: %d offset:
// %d",Nvbc_alloc->bclass,Nvbc_alloc->obj_offset,bb->obj_offset,offset);
}
// error('d',"offset_magic_0 offset: %d virtualBC %t",offset,bcl);
return offset;
}
static int offset_magic_1(Pbcl b, Pbcl bl) {
// error('d',"offset_magic_1( %t, %t )",b->bclass,bl->bclass);
char *str = b->bclass->string;
for (Pbcl bb = bl->bclass->baselist; bb; bb = bb->next) {
if (bb->base != VIRTUAL)
continue;
char *s = bb->bclass->string;
if (strcmp(s, str) == 0) {
int offset = bb->obj_offset - bb->ptr_offset + 1;
// error('d',"str: %s offset: %d obj_offset: %d",str,offset,bl->obj_offset);
return offset + bl->obj_offset;
}
}
// error('d',"0 offset_magic_1 for virtualBC%t contained within%t",b->bclass,bl->bclass);
return 0;
}
// cope with offsets of virtuals in deep nests: promoted, not allocated
extern int link_compat_hack;
static int Voffset;
bit Vvtab;
bit Vvbc_alloc;
bit Vvbc_inher;
int classdef::get_offset(char *s, bit rechk)
/* Get offset represented by string as viewed from "this" */
{
// error('d',"%s::get_offset(%s %d)",string,s,rechk);
if (!s)
return 0;
char *str = get_classname(s);
Pbcl b = get_base(str);
bit unalloc = 0;
char *found_virtual = 0;
if (rechk) {
// unalloc = (b->promoted && (b->allocated == 0));
unalloc = (b->promoted && (b->allocated != 1));
// error('d',"%s::get_offset unalloc: %d b->alloc: %d",string,unalloc,b->allocated);
if (!unalloc)
return 0;
Vvtab = 0; // promoted virtual base contains vtbl
Vvbc_inher = 0;
Vvbc_alloc = 0; // promoted virtual base contains vtbl
Nvbc_alloc = 0; // set by has_allocated_base
found_virtual = has_allocated_base(str);
}
if (unalloc) {
// error('d', "recheck get_offset: voffset: %d found_virtual: %s str: %s ps:
// %s",Voffset,found_virtual,str);
if (found_virtual == 0) {
if (Vvbc_alloc && b->bclass->baselist)
return b->obj_offset;
if (strcmp(s, str)) {
if (Vvbc_inher)
return 0;
if (Vvtab == 0)
return b->bclass->get_offset(drop_classname(s));
return b->obj_offset + b->bclass->get_offset(drop_classname(s));
} else {
if (Vvbc_inher) {
if (b->allocated == 2)
link_compat_hack = b->obj_offset;
return 0;
}
return offset_magic_0(baselist->next, b, virt_count);
}
}
if (found_virtual) {
if (strcmp(s, str))
return offset_magic_1(b, get_base(found_virtual));
else
return b->obj_offset;
}
}
return b->obj_offset + b->bclass->get_offset(drop_classname(s));
}
char *vtbl_str(char *s1, char *s2)
/*
combine two pieces of a vtbl name
*/
{
// error('d',"vtbl_str(%s,%s)",s1,s2);
char *s3;
if (s1)
if (s2) {
s3 = new char[strlen(s1) + strlen(s2) + 3];
sprintf(s3, "%s__%s", s1, s2);
return s3;
} else
return s1;
else
return s2;
}
void classdef::add_vtbl(velem *v, char *s, bit virt_flag, int n_init)
/*
add vtbl to virt_list
*/
{
// error('d',"%t->add_vtbl(%d,%s)",this,v,s);
Pvirt vtab = new virt(this, v, s, virt_flag, n_init);
if (virt_flag)
has_vvtab = 1;
if (!virt_list) {
virt_list = vtab;
return;
}
// If conficting vtable entries are made because of
// a virtual base class, must be considered an error.
for (Pvirt vt = virt_list; vt; vt = vt->next)
if (vt->string && strcmp(vt->string, s) == 0) {
velem *ivec = vt->virt_init;
Pname on = ivec[0].n;
Pname nn = v[0].n;
Pclass ocl, ncl;
for (int i = 0; on && nn; i++, on = ivec[i].n, nn = v[i].n) {
ocl = Pfct(on->tp)->memof;
ncl = Pfct(nn->tp)->memof;
if (on != nn)
if (!ocl->has_base(ncl))
if (!ncl->has_base(ocl))
break;
else {
ivec[i].n = nn;
ivec[i].offset = v[i].offset;
}
}
if (on || nn)
error("virtualB: ambiguous%n and%n", on, nn);
return;
}
vtab->next = virt_list->next;
virt_list->next = vtab;
}
static int baseoffset(Pclass b, Pclass d)
/*
find offset of base class object "b" in derived class object "d"
*/
{
static int level = 0;
++level;
if (!b || !d) {
error('i', "invalidA to baseoffset()");
}
if (same_class(b, d)) { // b == d
level--;
return 0;
}
Pbcl bx;
// is "b" a direct base of "d" or a promoted indirect virtual base ?
for (bx = d->baselist; bx; bx = bx->next) {
if (same_class(b, bx->bclass)) { //(b == bx->bclass)
level--;
return bx->obj_offset;
}
}
// recursively search for "b" in bases of "d"
for (bx = d->baselist; bx; bx = bx->next) {
// don't search indirect virtual bases
if (bx->promoted)
continue;
int found = baseoffset(b, bx->bclass);
if (found != -1) {
level--;
return bx->obj_offset + found;
}
}
if (level-- > 1)
return -1; // b!=d and b is not a base of d
error('i', "fall off end of baseoffset()");
return 0;
}
int vcounter;
static int vmax;
const int vpChunk = 32;
int classdef::do_virtuals(Pvirt vtab, char *str, int leftmost, bit virt_flag)
/*
make vtbl for b in "this"
match up virtuals and assign virtual indices for the base or delegate "bcl"
first base class shares ``this'' and vtbl with this class
*/
{
if (vmax < vcounter)
vmax = vcounter;
int vpsz = (vmax + vcounter) / vpChunk + 1; // fragmentation prevention
vpsz *= vpChunk;
Pname *vp = new Pname[vpsz];
velem *ivec = vtab ? vtab->virt_init : 0;
int vo = Voffset;
int vc = 0;
int changed = 0;
// error('d',"%t->do_virtuals(%d,%s) voffset %d",this,vtab,str,Voffset);
// error('d',"virt_count %d vpsz %d vcounter %d",virt_count,vpsz,vcounter);
if (ivec) { // vtbl replacement for ivec
if (vtab->is_vbase) {
str = 0;
Voffset = get_offset(vtab->string);
// error('d',"vtabl->is_vbase: %s->get_offset(%s), voffset:
// %d",string,vtab->string,Voffset);
} else
Voffset = Voffset + vtab->vclass->get_offset(vtab->string);
Pname vn;
for (int i = 0; vn = ivec[i].n; i++) {
/*
go through virtual table's list of virtuals:
first see if the function is simply inherited
if not, check for a match
if not, then add as new
*/
if (i >= vpsz) { // resize vp vector
int tvpsz = vpsz + vpChunk;
Pname *tvp = new Pname[tvpsz];
for (int j = 0; j < i; ++j)
tvp[j] = vp[j];
delete[/*vpsz*/] vp;
vp = tvp;
// error( 'd',"resizing: i: %d vpsz: %d tvpsz: %d", i, vpsz, tvpsz );
vpsz = tvpsz;
}
char *s = vn->n_gen_fct_name;
Pname n = memtbl->look(s ? s : vn->string, 0);
// error('d',"vn %n %s n %n %d",vn,s,n,Voffset);
// error('d',"n %n %k", n, n?n->base:0 );
if (n == 0 || n->base == PUBLIC) { // FCT + FCT
// base::FCT
inher: // inherit
if (vn->n_initializer) {
if (!get_vf(vn, this)) {
c_abstract = vn;
}
}
vp[i] = vn;
if (ivec[i].offset && vtab->is_vbase) {
// error('d',"voffset[1]: %d vo: %d ivec[%d].offset:
// %d",Voffset,vo,i,ivec[i].offset);
vp[i]->n_offset = Voffset - baseoffset(Pfct(vn->tp)->memof, this);
} else
vp[i]->n_offset = ivec[i].offset;
continue;
}
Pfct f = Pfct(n->tp);
if (f == 0)
continue;
if (s && f->base == OVERLOAD) { // OVERLOAD + OVERLOAD
// vn is overloaded
// and s is its name
for (Plist gl = Pgen(f)->fct_list; gl; gl = gl->l)
if (gl->f == vn)
goto inher;
}
Pfct vnf = Pfct(vn->tp);
switch (f->base) { // re-define?
default:
error('w', &n->where, "%n hides virtual%n", n, vn);
vp[i] = vn; // not a new overloaded: inherit
if (vn->n_initializer) {
if (!get_vf(vn, this)) {
c_abstract = vn;
}
}
if (ivec[i].offset && vtab->is_vbase) {
if (Voffset - vo != ivec[i].offset) {
// error('d',"voffset[2]: %d vo: %d ivec[%d].offset:
// %d",Voffset,vo,i,ivec[i].offset);
int noffset = get_offset(vtab->string, 1);
if (noffset && noffset != Voffset)
noffset -= vo;
if (noffset == 0) {
if (Vvbc_inher)
noffset = link_compat_hack ? link_compat_hack - ivec[i].offset
: ivec[i].offset;
else
noffset = Voffset - vo;
}
vp[i]->n_offset = noffset;
} else
vp[i]->n_offset = Voffset - vo;
} else
vp[i]->n_offset = ivec[i].offset;
break;
case FCT: // derived::FCT
{
if (vnf->check(f, VIRTUAL)
== 0) { // derived::FCT match base::FCT
// VTOK: virtual, but no index assigned
// you can only inherit an index from your first base
if (Vcheckerror)
error("bad virtualT match for %n", vn);
if (f->f_virtual == VTOK)
f->f_virtual = i + 1;
vp[i] = n;
vp[i]->n_offset = Voffset;
changed = 1;
} else {
if (Vcheckerror)
error("bad virtualT match for %n", vn);
else {
// if (! vn->n_initializer) // not a pure virtual ?????
// inherits a pure virtual -- make abstract
if (vn->n_initializer) {
if (!get_vf(vn, this)) {
c_abstract = vn;
}
}
error('w', &n->where, "%n hides virtual%n", n, vn);
}
vp[i] = vn; // not a new overloaded: inherit
if (ivec[i].offset && vtab->is_vbase) {
if (Voffset - vo != ivec[i].offset) {
// error('d',"voffset[3]: %d vo: %d ivec[%d].offset:
// %d",Voffset,vo,i,ivec[i].offset);
int noffset = get_offset(vtab->string, 1);
if (noffset && noffset != Voffset)
noffset -= vo;
if (noffset == 0) {
if (Vvbc_inher)
noffset = link_compat_hack ? link_compat_hack - ivec[i].offset
: ivec[i].offset;
else
noffset = Voffset - vo;
}
vp[i]->n_offset = noffset;
} else
vp[i]->n_offset = Voffset - vo;
} else
vp[i]->n_offset = ivec[i].offset;
}
break;
}
case OVERLOAD: // derived::OVERLOAD
{
int hit = 0;
for (Plist gl = Pgen(f)->fct_list; gl; gl = gl->l) {
// try each fct from derived class
Pname fn = gl->f;
Pfct f = Pfct(fn->tp);
if (f->check(vnf, VIRTUAL) == 0) { // derived::FCT
if (Vcheckerror)
error("bad virtualT match for %n", vn);
if (f->f_virtual == VTOK)
f->f_virtual = i + 1;
vp[i] = fn;
vp[i]->n_offset = Voffset;
changed = 1;
goto found;
} else {
if (Vcheckerror)
error("bad virtualT match for %n", vn);
}
if (Vcheckerror == 0)
switch (f->f_virtual) {
case 0:
case VTOK:
hit = 1;
}
}
if (hit) {
// inherits a pure virtual -- make it abstract
if (vn->n_initializer) {
if (!get_vf(vn, this)) {
c_abstract = vn;
}
}
error('w', &n->where, "%n hides virtual%n ofT %t", n, vn, vn->tp);
}
vp[i] = vn; // not a new overloaded: inherit
if (ivec[i].offset && vtab->is_vbase) {
if (Voffset - vo != ivec[i].offset) {
// error('d',"voffset[4]: %d vo: %d ivec[%d].offset:
// %d",Voffset,vo,i,ivec[i].offset);
int noffset = get_offset(vtab->string, 1);
if (noffset && noffset != Voffset)
noffset -= vo;
if (noffset == 0) {
if (Vvbc_inher)
noffset = link_compat_hack ? link_compat_hack - ivec[i].offset
: ivec[i].offset;
else
noffset = Voffset - vo;
}
vp[i]->n_offset = noffset;
} else
vp[i]->n_offset = Voffset - vo;
} else
vp[i]->n_offset = ivec[i].offset;
found:
break;
}
}
}
Voffset = vo;
vc = i;
}
// error( 'd', "do_virtuals: out of loop: vc: %d vpsz: %d changed: %d", vc, vpsz,changed );
if (leftmost) {
/*
add new virtuals:
`VTOK' marks ``new virtual, no index assigned''.
You can only be new once (no base or first base).
*/
int i;
for (Pname nn = memtbl->get_mem(i = 1); nn; NEXT_NAME(memtbl, nn, i)) {
if (nn->base == TNAME)
continue;
Pfct f = Pfct(nn->tp);
if (vc >= vpsz) { // resize vp vector
int tvpsz = vpsz + vpChunk;
Pname *tvp = new Pname[tvpsz];
for (int j = 0; j < vc; ++j)
tvp[j] = vp[j];
delete[/*vpsz*/] vp;
vp = tvp;
vpsz = tvpsz;
}
// error('d',"f %n %t",nn,f);
if (f)
switch (f->base) {
case FCT:
// error('d',"fv %d",f->f_virtual);
if (f->f_virtual == VTOK) {
// declared virtual, or
// virtual in some base
f->f_virtual = ++vc;
vp[f->f_virtual - 1] = nn;
vp[f->f_virtual - 1]->n_offset = 0;
f->f_vdef = 1;
changed = 2;
}
break;
case OVERLOAD: {
for (Plist gl = Pgen(f)->fct_list; gl; gl = gl->l) {
Pname fn = gl->f;
Pfct f = Pfct(fn->tp);
if (vc >= vpsz) { // resize vp vector
int tvpsz = vpsz + vpChunk;
Pname *tvp = new Pname[tvpsz];
for (int j = 0; j < vc; ++j) {
tvp[j] = vp[j];
}
delete[/*vpsz*/] vp;
vp = tvp;
vpsz = tvpsz;
}
if (f->f_virtual == VTOK) {
f->f_virtual = ++vc;
vp[f->f_virtual - 1] = fn;
vp[f->f_virtual - 1]->n_offset = 0;
f->f_vdef = 1;
changed = 2;
}
}
break;
}
}
}
// error('d',"%s changed %d has_vvtab %d",string,changed,has_vvtab);
// error('d',"vc %d vpsz %d",vc,vpsz);
virt_count = 0;
if (changed)
virt_count = vc;
else if (has_vvtab) {
virt_merge = 1;
if (vc && vtab->is_vbase)
leftmost = 0;
}
}
// error('d',"vc %d ch %d vp[%d] virt_count %d",vc,changed,vpsz,virt_count);
if (changed || !leftmost) {
// vc==0 if all explicit virtuals in fact were declared in base
velem *v = new velem[vc + 1];
for (int i = 0; i < vc; i++) {
v[i].n = vp[i];
v[i].offset = vp[i]->n_offset;
}
v[vc].n = 0;
if (leftmost)
add_vtbl(v, 0, 0, 0);
else
add_vtbl(v, vtbl_str(vtab->string, str), virt_flag || vtab->is_vbase, vc + 1);
delete vp;
vcounter = 0;
return 1;
}
delete vp;
vcounter = 0;
return 0;
}
int classdef::all_virt(Pclass bcl, char *s, int leftmost, bit virt_flag) {
// error('d',"%t->all_virt( %t %s leftmost: %d",this,bcl,s,leftmost);
int i = 0;
if (bcl->virt_count) {
for (Pvirt blist = bcl->virt_list; blist; blist = blist->next) {
if (virt_merge && virt_flag == 0 && blist->is_vbase == 0)
continue;
i += do_virtuals(blist, s, leftmost, virt_flag);
if (i == 0 && leftmost && virt_merge == 0)
return 0;
leftmost = 0;
}
}
// finding virt_list stops recursive step
// if vtables found and updated, return number
if (i)
return i;
for (Pbcl b = bcl->baselist; b; b = b->next) {
if (b->promoted)
continue;
// error('d',"all_virt b %t vl %d bl %d",b->bclass,b->bclass->virt_list,b->bclass->baselist);
if (leftmost && b->base == VIRTUAL) {
i += do_virtuals(0, 0, 1, 0);
if (i == 0 && virt_merge == 0) {
// be careful to propagate class abstraction
if (bcl == this && b->bclass->c_abstract)
c_abstract = b->bclass->c_abstract;
return 0;
}
leftmost = 0;
}
int vo = Voffset;
if (b->base == VIRTUAL) {
Voffset = baseoffset(b->bclass, this);
} else {
Voffset += b->obj_offset;
}
// error('d',"all_virt obj_offset %t voffset %d vo %d %d",b->bclass,Voffset,vo);
if (b->base == VIRTUAL)
i += all_virt(b->bclass, b->bclass->string, leftmost, 1);
else
i += all_virt(b->bclass, vtbl_str(b->bclass->string, s), leftmost, virt_flag);
if (i == 0 && leftmost && virt_merge == 0) {
// be careful to propagate class abstraction
if (bcl == this && !c_abstract && b->next) {
for (Pbcl bb = b; bb; bb = bb->next) {
if (bb->promoted)
continue;
if (bb->bclass->c_abstract)
c_abstract = bb->bclass->c_abstract;
}
}
return 0;
}
Voffset = vo;
leftmost = 0;
}
// if recursion updated vtables, return number
if (i)
return i;
// no vtables updated in recursion
// look for new virtuals
if (leftmost)
return do_virtuals(0, 0, 1, 0);
else
return 0;
}
Pexpr copy_obj(Pexpr l, Pexpr r, int sz)
/*
generate:
struct _s { char[sz]; };
*(struct _s*)this->m = *(struct _s*)arg.mem;
*/
{
if (!sz)
sz = 1;
// error('d',"copy_obj(%d)",sz);
char *s = make_name('S');
fprintf(out_file, "struct %s { char v[%d]; };\n", s, sz);
Pname n = new name(s);
Ptype t = new basetype(COBJ, n);
t = new ptr(PTR, t);
l = new texpr(G_CAST, t, l); // new cast(t,l);
l = l->contents();
r = new texpr(G_CAST, t, r); // new cast(t,r);
r = r->contents();
return new expr(ASSIGN, l, r);
}
Ptype find_arg_type(Pclass cl)
// first determine argument type
{
int i;
int mod = 0;
for (Pbcl b = cl->baselist; b; b = b->next) {
Pclass bcl = b->bclass;
switch (b->base) {
case VIRTUAL:
case NAME: // generate :b(*(b*)&arg)
{
Pname itor = bcl->has_itor();
if (itor && itor->tp->base == FCT) {
Pname a = Pfct(itor->tp)->argtype;
Pptr p = a->tp->is_ref();
if (p && p->typ->tconst() == 0) {
mod = 1;
goto ll1;
}
}
}
}
}
ll1:
if (mod == 0) {
for (Pname m = cl->memtbl->get_mem(i = 1); m; NEXT_NAME(cl->memtbl, m, i)) {
if (m->base == TNAME)
continue;
if (m->n_evaluated || m->n_stclass == STATIC) // ignore static members
continue;
Pname cln = (m->base == PUBLIC ? m->n_qualifier : m)->tp->is_cl_obj();
if (cln) {
Pname itor = Pclass(cln->tp)->has_itor();
if (itor && itor->tp->base == FCT) {
Pname a = Pfct(itor->tp)->argtype;
Pptr p = a->tp->is_ref();
if (p && p->typ->tconst() == 0) {