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class.c
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class.c
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// Compiler implementation of the D programming language
// Copyright (c) 1999-2012 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h> // mem{cpy|set}()
#include "root.h"
#include "rmem.h"
#include "enum.h"
#include "init.h"
#include "attrib.h"
#include "declaration.h"
#include "aggregate.h"
#include "id.h"
#include "mtype.h"
#include "scope.h"
#include "module.h"
#include "expression.h"
#include "statement.h"
/********************************* ClassDeclaration ****************************/
ClassDeclaration *ClassDeclaration::classinfo;
ClassDeclaration *ClassDeclaration::object;
ClassDeclaration *ClassDeclaration::throwable;
ClassDeclaration *ClassDeclaration::exception;
ClassDeclaration *ClassDeclaration::errorException;
ClassDeclaration::ClassDeclaration(Loc loc, Identifier *id, BaseClasses *baseclasses)
: AggregateDeclaration(loc, id)
{
static char msg[] = "only object.d can define this reserved class name";
if (baseclasses)
// Actually, this is a transfer
this->baseclasses = baseclasses;
else
this->baseclasses = new BaseClasses();
baseClass = NULL;
interfaces_dim = 0;
interfaces = NULL;
vtblInterfaces = NULL;
//printf("ClassDeclaration(%s), dim = %d\n", id->toChars(), this->baseclasses->dim);
// For forward references
type = new TypeClass(this);
handle = type;
staticCtor = NULL;
staticDtor = NULL;
vtblsym = NULL;
vclassinfo = NULL;
if (id)
{ // Look for special class names
if (id == Id::__sizeof || id == Id::__xalignof || id == Id::mangleof)
error("illegal class name");
// BUG: What if this is the wrong TypeInfo, i.e. it is nested?
if (id->toChars()[0] == 'T')
{
if (id == Id::TypeInfo)
{ if (Type::typeinfo)
Type::typeinfo->error("%s", msg);
Type::typeinfo = this;
}
if (id == Id::TypeInfo_Class)
{ if (Type::typeinfoclass)
Type::typeinfoclass->error("%s", msg);
Type::typeinfoclass = this;
}
if (id == Id::TypeInfo_Interface)
{ if (Type::typeinfointerface)
Type::typeinfointerface->error("%s", msg);
Type::typeinfointerface = this;
}
if (id == Id::TypeInfo_Struct)
{ if (Type::typeinfostruct)
Type::typeinfostruct->error("%s", msg);
Type::typeinfostruct = this;
}
if (id == Id::TypeInfo_Typedef)
{ if (Type::typeinfotypedef)
Type::typeinfotypedef->error("%s", msg);
Type::typeinfotypedef = this;
}
if (id == Id::TypeInfo_Pointer)
{ if (Type::typeinfopointer)
Type::typeinfopointer->error("%s", msg);
Type::typeinfopointer = this;
}
if (id == Id::TypeInfo_Array)
{ if (Type::typeinfoarray)
Type::typeinfoarray->error("%s", msg);
Type::typeinfoarray = this;
}
if (id == Id::TypeInfo_StaticArray)
{ //if (Type::typeinfostaticarray)
//Type::typeinfostaticarray->error("%s", msg);
Type::typeinfostaticarray = this;
}
if (id == Id::TypeInfo_AssociativeArray)
{ if (Type::typeinfoassociativearray)
Type::typeinfoassociativearray->error("%s", msg);
Type::typeinfoassociativearray = this;
}
if (id == Id::TypeInfo_Enum)
{ if (Type::typeinfoenum)
Type::typeinfoenum->error("%s", msg);
Type::typeinfoenum = this;
}
if (id == Id::TypeInfo_Function)
{ if (Type::typeinfofunction)
Type::typeinfofunction->error("%s", msg);
Type::typeinfofunction = this;
}
if (id == Id::TypeInfo_Delegate)
{ if (Type::typeinfodelegate)
Type::typeinfodelegate->error("%s", msg);
Type::typeinfodelegate = this;
}
if (id == Id::TypeInfo_Tuple)
{ if (Type::typeinfotypelist)
Type::typeinfotypelist->error("%s", msg);
Type::typeinfotypelist = this;
}
#if DMDV2
if (id == Id::TypeInfo_Const)
{ if (Type::typeinfoconst)
Type::typeinfoconst->error("%s", msg);
Type::typeinfoconst = this;
}
if (id == Id::TypeInfo_Invariant)
{ if (Type::typeinfoinvariant)
Type::typeinfoinvariant->error("%s", msg);
Type::typeinfoinvariant = this;
}
if (id == Id::TypeInfo_Shared)
{ if (Type::typeinfoshared)
Type::typeinfoshared->error("%s", msg);
Type::typeinfoshared = this;
}
if (id == Id::TypeInfo_Wild)
{ if (Type::typeinfowild)
Type::typeinfowild->error("%s", msg);
Type::typeinfowild = this;
}
if (id == Id::TypeInfo_Vector)
{ if (Type::typeinfovector)
Type::typeinfovector->error("%s", msg);
Type::typeinfovector = this;
}
#endif
}
if (id == Id::Object)
{ if (object)
object->error("%s", msg);
object = this;
}
if (id == Id::Throwable)
{ if (throwable)
throwable->error("%s", msg);
throwable = this;
}
if (id == Id::Exception)
{ if (exception)
exception->error("%s", msg);
exception = this;
}
if (id == Id::Error)
{ if (errorException)
errorException->error("%s", msg);
errorException = this;
}
//if (id == Id::ClassInfo)
if (id == Id::TypeInfo_Class)
{ if (classinfo)
classinfo->error("%s", msg);
classinfo = this;
}
if (id == Id::ModuleInfo)
{ if (Module::moduleinfo)
Module::moduleinfo->error("%s", msg);
Module::moduleinfo = this;
}
}
com = 0;
isscope = 0;
isabstract = 0;
inuse = 0;
}
Dsymbol *ClassDeclaration::syntaxCopy(Dsymbol *s)
{
ClassDeclaration *cd;
//printf("ClassDeclaration::syntaxCopy('%s')\n", toChars());
if (s)
cd = (ClassDeclaration *)s;
else
cd = new ClassDeclaration(loc, ident, NULL);
cd->storage_class |= storage_class;
cd->baseclasses->setDim(this->baseclasses->dim);
for (size_t i = 0; i < cd->baseclasses->dim; i++)
{
BaseClass *b = (*this->baseclasses)[i];
BaseClass *b2 = new BaseClass(b->type->syntaxCopy(), b->protection);
(*cd->baseclasses)[i] = b2;
}
ScopeDsymbol::syntaxCopy(cd);
return cd;
}
void ClassDeclaration::semantic(Scope *sc)
{
//printf("ClassDeclaration::semantic(%s), type = %p, sizeok = %d, this = %p\n", toChars(), type, sizeok, this);
//printf("\tparent = %p, '%s'\n", sc->parent, sc->parent ? sc->parent->toChars() : "");
//printf("sc->stc = %x\n", sc->stc);
//{ static int n; if (++n == 20) *(char*)0=0; }
if (!ident) // if anonymous class
{ const char *id = "__anonclass";
ident = Identifier::generateId(id);
}
if (!sc)
sc = scope;
if (!parent && sc->parent && !sc->parent->isModule())
parent = sc->parent;
type = type->semantic(loc, sc);
handle = type;
if (!members) // if forward reference
{ //printf("\tclass '%s' is forward referenced\n", toChars());
return;
}
if (symtab)
{ if (sizeok == SIZEOKdone || !scope)
{ //printf("\tsemantic for '%s' is already completed\n", toChars());
return; // semantic() already completed
}
}
else
symtab = new DsymbolTable();
Scope *scx = NULL;
if (scope)
{ sc = scope;
scx = scope; // save so we don't make redundant copies
scope = NULL;
}
unsigned dprogress_save = Module::dprogress;
int errors = global.gaggedErrors;
if (sc->stc & STCdeprecated)
{
isdeprecated = true;
}
if (sc->linkage == LINKcpp)
error("cannot create C++ classes");
// Expand any tuples in baseclasses[]
for (size_t i = 0; i < baseclasses->dim; )
{ BaseClass *b = (*baseclasses)[i];
b->type = b->type->semantic(loc, sc);
Type *tb = b->type->toBasetype();
if (tb->ty == Ttuple)
{ TypeTuple *tup = (TypeTuple *)tb;
enum PROT protection = b->protection;
baseclasses->remove(i);
size_t dim = Parameter::dim(tup->arguments);
for (size_t j = 0; j < dim; j++)
{ Parameter *arg = Parameter::getNth(tup->arguments, j);
b = new BaseClass(arg->type, protection);
baseclasses->insert(i + j, b);
}
}
else
i++;
}
// See if there's a base class as first in baseclasses[]
if (baseclasses->dim)
{ TypeClass *tc;
BaseClass *b;
Type *tb;
b = (*baseclasses)[0];
//b->type = b->type->semantic(loc, sc);
tb = b->type->toBasetype();
if (tb->ty != Tclass)
{ if (b->type != Type::terror)
error("base type must be class or interface, not %s", b->type->toChars());
baseclasses->remove(0);
}
else
{
tc = (TypeClass *)(tb);
if (tc->sym->isDeprecated())
{
if (!isDeprecated())
{
// Deriving from deprecated class makes this one deprecated too
isdeprecated = true;
tc->checkDeprecated(loc, sc);
}
}
if (tc->sym->isInterfaceDeclaration())
;
else
{
for (ClassDeclaration *cdb = tc->sym; cdb; cdb = cdb->baseClass)
{
if (cdb == this)
{
error("circular inheritance");
baseclasses->remove(0);
goto L7;
}
}
if (!tc->sym->symtab || tc->sym->sizeok == SIZEOKnone)
{ // Try to resolve forward reference
if (/*sc->mustsemantic &&*/ tc->sym->scope)
tc->sym->semantic(NULL);
}
if (!tc->sym->symtab || tc->sym->scope || tc->sym->sizeok == SIZEOKnone)
{
//printf("%s: forward reference of base class %s\n", toChars(), tc->sym->toChars());
//error("forward reference of base class %s", baseClass->toChars());
// Forward reference of base class, try again later
//printf("\ttry later, forward reference of base class %s\n", tc->sym->toChars());
scope = scx ? scx : new Scope(*sc);
scope->setNoFree();
if (tc->sym->scope)
tc->sym->scope->module->addDeferredSemantic(tc->sym);
scope->module->addDeferredSemantic(this);
return;
}
else
{ baseClass = tc->sym;
b->base = baseClass;
}
L7: ;
}
}
}
// Treat the remaining entries in baseclasses as interfaces
// Check for errors, handle forward references
for (size_t i = (baseClass ? 1 : 0); i < baseclasses->dim; )
{ TypeClass *tc;
BaseClass *b;
Type *tb;
b = (*baseclasses)[i];
b->type = b->type->semantic(loc, sc);
tb = b->type->toBasetype();
if (tb->ty == Tclass)
tc = (TypeClass *)tb;
else
tc = NULL;
if (!tc || !tc->sym->isInterfaceDeclaration())
{ if (b->type != Type::terror)
error("base type must be interface, not %s", b->type->toChars());
baseclasses->remove(i);
continue;
}
else
{
if (tc->sym->isDeprecated())
{
if (!isDeprecated())
{
// Deriving from deprecated class makes this one deprecated too
isdeprecated = true;
tc->checkDeprecated(loc, sc);
}
}
// Check for duplicate interfaces
for (size_t j = (baseClass ? 1 : 0); j < i; j++)
{
BaseClass *b2 = (*baseclasses)[j];
if (b2->base == tc->sym)
error("inherits from duplicate interface %s", b2->base->toChars());
}
if (!tc->sym->symtab)
{ // Try to resolve forward reference
if (/*sc->mustsemantic &&*/ tc->sym->scope)
tc->sym->semantic(NULL);
}
b->base = tc->sym;
if (!b->base->symtab || b->base->scope)
{
//error("forward reference of base class %s", baseClass->toChars());
// Forward reference of base, try again later
//printf("\ttry later, forward reference of base %s\n", baseClass->toChars());
scope = scx ? scx : new Scope(*sc);
scope->setNoFree();
if (tc->sym->scope)
tc->sym->scope->module->addDeferredSemantic(tc->sym);
scope->module->addDeferredSemantic(this);
return;
}
}
i++;
}
// If no base class, and this is not an Object, use Object as base class
if (!baseClass && ident != Id::Object)
{
if (!object)
{
error("missing or corrupt object.d");
fatal();
}
Type *t = object->type;
t = t->semantic(loc, sc)->toBasetype();
assert(t->ty == Tclass);
TypeClass *tc = (TypeClass *)t;
BaseClass *b = new BaseClass(tc, PROTpublic);
baseclasses->shift(b);
baseClass = tc->sym;
assert(!baseClass->isInterfaceDeclaration());
b->base = baseClass;
}
interfaces_dim = baseclasses->dim;
interfaces = baseclasses->tdata();
if (baseClass)
{
if (baseClass->storage_class & STCfinal)
error("cannot inherit from final class %s", baseClass->toChars());
interfaces_dim--;
interfaces++;
// Copy vtbl[] from base class
vtbl.setDim(baseClass->vtbl.dim);
memcpy(vtbl.tdata(), baseClass->vtbl.tdata(), sizeof(void *) * vtbl.dim);
// Inherit properties from base class
com = baseClass->isCOMclass();
isscope = baseClass->isscope;
vthis = baseClass->vthis;
storage_class |= baseClass->storage_class & STC_TYPECTOR;
}
else
{
// No base class, so this is the root of the class hierarchy
vtbl.setDim(0);
vtbl.push(this); // leave room for classinfo as first member
}
protection = sc->protection;
storage_class |= sc->stc;
if (sizeok == SIZEOKnone)
{
interfaceSemantic(sc);
for (size_t i = 0; i < members->dim; i++)
{
Dsymbol *s = (*members)[i];
s->addMember(sc, this, 1);
}
/* If this is a nested class, add the hidden 'this'
* member which is a pointer to the enclosing scope.
*/
if (vthis) // if inheriting from nested class
{ // Use the base class's 'this' member
isnested = 1;
if (storage_class & STCstatic)
error("static class cannot inherit from nested class %s", baseClass->toChars());
if (toParent2() != baseClass->toParent2() &&
(!toParent2() ||
!baseClass->toParent2()->getType()->isBaseOf(toParent2()->getType(), NULL)))
{
if (toParent2())
{
error("is nested within %s, but super class %s is nested within %s",
toParent2()->toChars(),
baseClass->toChars(),
baseClass->toParent2()->toChars());
}
else
{
error("is not nested, but super class %s is nested within %s",
baseClass->toChars(),
baseClass->toParent2()->toChars());
}
isnested = 0;
}
}
else if (!(storage_class & STCstatic))
{ Dsymbol *s = toParent2();
if (s)
{
AggregateDeclaration *ad = s->isClassDeclaration();
FuncDeclaration *fd = s->isFuncDeclaration();
if (ad || fd)
{ isnested = 1;
Type *t;
if (ad)
t = ad->handle;
else if (fd)
{ AggregateDeclaration *ad2 = fd->isMember2();
if (ad2)
t = ad2->handle;
else
{
t = Type::tvoidptr;
}
}
else
assert(0);
if (t->ty == Tstruct) // ref to struct
t = Type::tvoidptr;
assert(!vthis);
vthis = new ThisDeclaration(loc, t);
members->push(vthis);
}
}
}
}
if (storage_class & STCauto)
error("storage class 'auto' is invalid when declaring a class, did you mean to use 'scope'?");
if (storage_class & STCscope)
isscope = 1;
if (storage_class & STCabstract)
isabstract = 1;
sc = sc->push(this);
//sc->stc &= ~(STCfinal | STCauto | STCscope | STCstatic | STCabstract | STCdeprecated | STC_TYPECTOR | STCtls | STCgshared);
//sc->stc |= storage_class & STC_TYPECTOR;
sc->stc &= STCsafe | STCtrusted | STCsystem;
sc->parent = this;
sc->inunion = 0;
if (isCOMclass())
{
#if _WIN32
sc->linkage = LINKwindows;
#else
/* This enables us to use COM objects under Linux and
* work with things like XPCOM
*/
sc->linkage = LINKc;
#endif
}
sc->protection = PROTpublic;
sc->explicitProtection = 0;
sc->structalign = STRUCTALIGN_DEFAULT;
if (baseClass)
{ sc->offset = baseClass->structsize;
alignsize = baseClass->alignsize;
// if (isnested)
// sc->offset += PTRSIZE; // room for uplevel context pointer
}
else
{ sc->offset = PTRSIZE * 2; // allow room for __vptr and __monitor
alignsize = PTRSIZE;
}
structsize = sc->offset;
Scope scsave = *sc;
size_t members_dim = members->dim;
sizeok = SIZEOKnone;
/* Set scope so if there are forward references, we still might be able to
* resolve individual members like enums.
*/
for (size_t i = 0; i < members_dim; i++)
{ Dsymbol *s = (*members)[i];
/* There are problems doing this in the general case because
* Scope keeps track of things like 'offset'
*/
if (s->isEnumDeclaration() ||
(s->isAggregateDeclaration() && s->ident) ||
s->isTemplateMixin() ||
s->isAttribDeclaration() ||
s->isAliasDeclaration())
{
//printf("[%d] setScope %s %s, sc = %p\n", i, s->kind(), s->toChars(), sc);
s->setScope(sc);
}
}
for (size_t i = 0; i < members_dim; i++)
{ Dsymbol *s = (*members)[i];
s->semantic(sc);
}
// Set the offsets of the fields and determine the size of the class
unsigned offset = structsize;
bool isunion = isUnionDeclaration() != NULL;
for (size_t i = 0; i < members->dim; i++)
{ Dsymbol *s = (*members)[i];
s->setFieldOffset(this, &offset, false);
}
sc->offset = structsize;
if (global.gag && global.gaggedErrors != errors)
{ // The type is no good, yet the error messages were gagged.
type = Type::terror;
}
if (sizeok == SIZEOKfwd) // failed due to forward references
{ // semantic() failed due to forward references
// Unwind what we did, and defer it for later
for (size_t i = 0; i < fields.dim; i++)
{ Dsymbol *s = fields[i];
VarDeclaration *vd = s->isVarDeclaration();
if (vd)
vd->offset = 0;
}
fields.setDim(0);
structsize = 0;
alignsize = 0;
// structalign = 0;
sc = sc->pop();
scope = scx ? scx : new Scope(*sc);
scope->setNoFree();
scope->module->addDeferredSemantic(this);
Module::dprogress = dprogress_save;
//printf("\tsemantic('%s') failed due to forward references\n", toChars());
return;
}
//printf("\tsemantic('%s') successful\n", toChars());
//members->print();
/* Look for special member functions.
* They must be in this class, not in a base class.
*/
ctor = search(0, Id::ctor, 0);
#if DMDV1
if (ctor && (ctor->toParent() != this || !ctor->isCtorDeclaration()))
ctor = NULL;
#else
if (ctor && (ctor->toParent() != this || !(ctor->isCtorDeclaration() || ctor->isTemplateDeclaration())))
ctor = NULL; // search() looks through ancestor classes
#endif
// dtor = (DtorDeclaration *)search(Id::dtor, 0);
// if (dtor && dtor->toParent() != this)
// dtor = NULL;
// inv = (InvariantDeclaration *)search(Id::classInvariant, 0);
// if (inv && inv->toParent() != this)
// inv = NULL;
// Can be in base class
aggNew = (NewDeclaration *)search(0, Id::classNew, 0);
aggDelete = (DeleteDeclaration *)search(0, Id::classDelete, 0);
// If this class has no constructor, but base class does, create
// a constructor:
// this() { }
if (!ctor && baseClass && baseClass->ctor)
{
//printf("Creating default this(){} for class %s\n", toChars());
Type *tf = new TypeFunction(NULL, NULL, 0, LINKd, 0);
CtorDeclaration *ctor = new CtorDeclaration(loc, 0, 0, tf);
ctor->fbody = new CompoundStatement(0, new Statements());
members->push(ctor);
ctor->addMember(sc, this, 1);
*sc = scsave; // why? What about sc->nofree?
ctor->semantic(sc);
this->ctor = ctor;
defaultCtor = ctor;
}
#if 0
if (baseClass)
{ if (!aggDelete)
aggDelete = baseClass->aggDelete;
if (!aggNew)
aggNew = baseClass->aggNew;
}
#endif
// Allocate instance of each new interface
sc->offset = structsize;
for (size_t i = 0; i < vtblInterfaces->dim; i++)
{
BaseClass *b = (*vtblInterfaces)[i];
unsigned thissize = PTRSIZE;
alignmember(STRUCTALIGN_DEFAULT, thissize, &sc->offset);
assert(b->offset == 0);
b->offset = sc->offset;
// Take care of single inheritance offsets
while (b->baseInterfaces_dim)
{
b = &b->baseInterfaces[0];
b->offset = sc->offset;
}
sc->offset += thissize;
if (alignsize < thissize)
alignsize = thissize;
}
structsize = sc->offset;
sizeok = SIZEOKdone;
Module::dprogress++;
dtor = buildDtor(sc);
sc->pop();
#if 0 // Do not call until toObjfile() because of forward references
// Fill in base class vtbl[]s
for (i = 0; i < vtblInterfaces->dim; i++)
{
BaseClass *b = (*vtblInterfaces)[i];
//b->fillVtbl(this, &b->vtbl, 1);
}
#endif
//printf("-ClassDeclaration::semantic(%s), type = %p\n", toChars(), type);
if (deferred && !global.gag)
{
deferred->semantic2(sc);
deferred->semantic3(sc);
}
}
void ClassDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{
if (!isAnonymous())
{
buf->printf("%s ", kind());
buf->writestring(toChars());
if (baseclasses->dim)
buf->writestring(" : ");
}
for (size_t i = 0; i < baseclasses->dim; i++)
{
BaseClass *b = (*baseclasses)[i];
if (i)
buf->writeByte(',');
//buf->writestring(b->base->ident->toChars());
b->type->toCBuffer(buf, NULL, hgs);
}
if (members)
{
buf->writenl();
buf->writeByte('{');
buf->writenl();
for (size_t i = 0; i < members->dim; i++)
{
Dsymbol *s = (*members)[i];
buf->writestring(" ");
s->toCBuffer(buf, hgs);
}
buf->writestring("}");
}
else
buf->writeByte(';');
buf->writenl();
}
#if 0
void ClassDeclaration::defineRef(Dsymbol *s)
{
ClassDeclaration *cd;
AggregateDeclaration::defineRef(s);
cd = s->isClassDeclaration();
baseType = cd->baseType;
cd->baseType = NULL;
}
#endif
/*********************************************
* Determine if 'this' is a base class of cd.
* This is used to detect circular inheritance only.
*/
int ClassDeclaration::isBaseOf2(ClassDeclaration *cd)
{
if (!cd)
return 0;
//printf("ClassDeclaration::isBaseOf2(this = '%s', cd = '%s')\n", toChars(), cd->toChars());
for (size_t i = 0; i < cd->baseclasses->dim; i++)
{ BaseClass *b = (*cd->baseclasses)[i];
if (b->base == this || isBaseOf2(b->base))
return 1;
}
return 0;
}
/*******************************************
* Determine if 'this' is a base class of cd.
*/
int ClassDeclaration::isBaseOf(ClassDeclaration *cd, int *poffset)
{
//printf("ClassDeclaration::isBaseOf(this = '%s', cd = '%s')\n", toChars(), cd->toChars());
if (poffset)
*poffset = 0;
while (cd)
{
/* cd->baseClass might not be set if cd is forward referenced.
*/
if (!cd->baseClass && cd->baseclasses->dim && !cd->isInterfaceDeclaration())
{
cd->semantic(NULL);
if (!cd->baseClass)
cd->error("base class is forward referenced by %s", toChars());
}
if (this == cd->baseClass)
return 1;
cd = cd->baseClass;
}
return 0;
}
/*********************************************
* Determine if 'this' has complete base class information.
* This is used to detect forward references in covariant overloads.
*/
int ClassDeclaration::isBaseInfoComplete()
{
if (!baseClass)
return ident == Id::Object;
for (size_t i = 0; i < baseclasses->dim; i++)
{ BaseClass *b = (*baseclasses)[i];
if (!b->base || !b->base->isBaseInfoComplete())
return 0;
}
return 1;
}
Dsymbol *ClassDeclaration::search(Loc loc, Identifier *ident, int flags)
{
Dsymbol *s;
//printf("%s.ClassDeclaration::search('%s')\n", toChars(), ident->toChars());
if (scope && !symtab)
{ Scope *sc = scope;
sc->mustsemantic++;
// If speculatively gagged, ungag now.
unsigned oldgag = global.gag;
if (global.isSpeculativeGagging())
global.gag = 0;
semantic(sc);
global.gag = oldgag;
sc->mustsemantic--;
}
if (!members || !symtab)
{
error("is forward referenced when looking for '%s'", ident->toChars());
//*(char*)0=0;
return NULL;
}
s = ScopeDsymbol::search(loc, ident, flags);
if (!s)
{
// Search bases classes in depth-first, left to right order
for (size_t i = 0; i < baseclasses->dim; i++)
{
BaseClass *b = (*baseclasses)[i];
if (b->base)
{
if (!b->base->symtab)
error("base %s is forward referenced", b->base->ident->toChars());
else
{
s = b->base->search(loc, ident, flags);
if (s == this) // happens if s is nested in this and derives from this
s = NULL;
else if (s)
break;
}
}
}
}
return s;
}
Dsymbol *ClassDeclaration::searchBase(Loc loc, Identifier *ident)
{
// Search bases classes in depth-first, left to right order
for (size_t i = 0; i < baseclasses->dim; i++)
{
BaseClass *b = (*baseclasses)[i];
Dsymbol *cdb = b->type->isClassHandle();
if (cdb->ident->equals(ident))
return cdb;
cdb = ((ClassDeclaration *)cdb)->searchBase(loc, ident);
if (cdb)
return cdb;
}
return NULL;
}
/**********************************************************
* fd is in the vtbl[] for this class.
* Return 1 if function is hidden (not findable through search).
*/
#if DMDV2
int isf(void *param, FuncDeclaration *fd)
{
//printf("param = %p, fd = %p %s\n", param, fd, fd->toChars());
return param == fd;
}
int ClassDeclaration::isFuncHidden(FuncDeclaration *fd)
{
//printf("ClassDeclaration::isFuncHidden(class = %s, fd = %s)\n", toChars(), fd->toChars());
Dsymbol *s = search(0, fd->ident, 4|2);
if (!s)
{ //printf("not found\n");
/* Because, due to a hack, if there are multiple definitions
* of fd->ident, NULL is returned.