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dstatic.d
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dstatic.d
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/*
* dstatic.d
*
* This module implements the static subset of D.
*
*/
module runtime.dstatic;
import runtime.util;
import runtime.common;
extern(C):
/******************************************
* Given a pointer:
* If it is an Object, return that Object.
* If it is an interface, return the Object implementing the interface.
* If it is null, return null.
* Else, undefined crash
*/
Object _d_toObject(void* p) {
Object o;
if (p) {
o = cast(Object)p;
ClassInfo oc = o.classinfo;
Interface *pi = **cast(Interface ***)p;
/* Interface.offset lines up with ClassInfo.name.ptr,
* so we rely on pointers never being less than 64K,
* and Objects never being greater.
*/
if (pi.offset < 0x10000) {
//printf("\tpi.offset = %d\n", pi.offset);
o = cast(Object)(p - pi.offset);
}
}
return o;
}
/*************************************
* Attempts to cast Object o to class c.
* Returns o if successful, null if not.
*/
Object _d_interface_cast(void* p, ClassInfo c) {
Object o;
//printf("_d_interface_cast(p = %p, c = '%.*s')\n", p, c.name);
if (p) {
Interface *pi = **cast(Interface ***)p;
//printf("\tpi.offset = %d\n", pi.offset);
o = cast(Object)(p - pi.offset);
return _d_dynamic_cast(o, c);
}
return o;
}
Object _d_dynamic_cast(Object o, ClassInfo c) {
ClassInfo oc;
size_t offset = 0;
//printf("_d_dynamic_cast(o = %p, c = '%.*s')\n", o, c.name);
if (o) {
oc = o.classinfo;
if (_d_isbaseof2(oc, c, offset)) {
//printf("\toffset = %d\n", offset);
o = cast(Object)(cast(void*)o + offset);
}
else
o = null;
}
//printf("\tresult = %p\n", o);
return o;
}
int _d_isbaseof2(ClassInfo oc, ClassInfo c, inout size_t offset) {
int i;
if (oc is c)
return 1;
do {
if (oc.base is c)
return 1;
for (i = 0; i < oc.interfaces.length; i++) {
ClassInfo ic;
ic = oc.interfaces[i].classinfo;
if (ic is c) {
offset = oc.interfaces[i].offset;
return 1;
}
}
for (i = 0; i < oc.interfaces.length; i++) {
ClassInfo ic;
ic = oc.interfaces[i].classinfo;
if (_d_isbaseof2(ic, c, offset)) {
offset = oc.interfaces[i].offset;
return 1;
}
}
oc = oc.base;
} while (oc);
return 0;
}
int _d_isbaseof(ClassInfo oc, ClassInfo c) {
int i;
if (oc is c)
return 1;
do {
if (oc.base is c)
return 1;
for (i = 0; i < oc.interfaces.length; i++) {
ClassInfo ic;
ic = oc.interfaces[i].classinfo;
if (ic is c || _d_isbaseof(ic, c))
return 1;
}
oc = oc.base;
} while (oc);
return 0;
}
/*********************************
* Find the vtbl[] associated with Interface ic.
*/
void *_d_interface_vtbl(ClassInfo ic, Object o) {
int i;
ClassInfo oc;
//printf("__d_interface_vtbl(o = %p, ic = %p)\n", o, ic);
assert(o);
oc = o.classinfo;
for (i = 0; i < oc.interfaces.length; i++) {
ClassInfo oic;
oic = oc.interfaces[i].classinfo;
if (oic is ic) {
return cast(void *)oc.interfaces[i].vtbl;
}
}
assert(0);
}
int _d_obj_eq(Object o1, Object o2) {
return o1 is o2 || (o1 && o1.opEquals(o2));
}
int _d_obj_cmp(Object o1, Object o2) {
return o1.opCmp(o2);
}