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/* Compiler implementation of the D programming language
* Copyright (C) 2009-2020 by The D Language Foundation, All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/D-Programming-Language/dmd/blob/master/src/aliasthis.c
*/
#include "root/dsystem.h"
#include "mars.h"
#include "identifier.h"
#include "aliasthis.h"
#include "scope.h"
#include "aggregate.h"
#include "dsymbol.h"
#include "mtype.h"
#include "declaration.h"
#include "tokens.h"
Expression *semantic(Expression *e, Scope *sc);
Expression *resolveAliasThis(Scope *sc, Expression *e, bool gag)
{
AggregateDeclaration *ad = isAggregate(e->type);
if (ad && ad->aliasthis)
{
unsigned olderrors = gag ? global.startGagging() : 0;
Loc loc = e->loc;
Type *tthis = (e->op == TOKtype ? e->type : NULL);
e = new DotIdExp(loc, e, ad->aliasthis->ident);
e = semantic(e, sc);
if (tthis && ad->aliasthis->needThis())
{
if (e->op == TOKvar)
{
if (FuncDeclaration *fd = ((VarExp *)e)->var->isFuncDeclaration())
{
// Bugzilla 13009: Support better match for the overloaded alias this.
bool hasOverloads = false;
if (FuncDeclaration *f = fd->overloadModMatch(loc, tthis, hasOverloads))
{
if (!hasOverloads)
fd = f; // use exact match
e = new VarExp(loc, fd, hasOverloads);
e->type = f->type;
e = new CallExp(loc, e);
goto L1;
}
}
}
/* non-@property function is not called inside typeof(),
* so resolve it ahead.
*/
{
int save = sc->intypeof;
sc->intypeof = 1; // bypass "need this" error check
e = resolveProperties(sc, e);
sc->intypeof = save;
}
L1:
e = new TypeExp(loc, new TypeTypeof(loc, e));
e = semantic(e, sc);
}
e = resolveProperties(sc, e);
if (gag && global.endGagging(olderrors))
e = NULL;
}
return e;
}
AliasThis::AliasThis(Loc loc, Identifier *ident)
: Dsymbol(NULL) // it's anonymous (no identifier)
{
this->loc = loc;
this->ident = ident;
}
Dsymbol *AliasThis::syntaxCopy(Dsymbol *s)
{
assert(!s);
return new AliasThis(loc, ident);
}
void AliasThis::semantic(Scope *sc)
{
if (semanticRun != PASSinit)
return;
if (_scope)
{
sc = _scope;
_scope = NULL;
}
if (!sc)
return;
semanticRun = PASSsemantic;
Dsymbol *p = sc->parent->pastMixin();
AggregateDeclaration *ad = p->isAggregateDeclaration();
if (!ad)
{
::error(loc, "alias this can only be a member of aggregate, not %s %s",
p->kind(), p->toChars());
return;
}
assert(ad->members);
Dsymbol *s = ad->search(loc, ident);
if (!s)
{
s = sc->search(loc, ident, NULL);
if (s)
::error(loc, "%s is not a member of %s", s->toChars(), ad->toChars());
else
::error(loc, "undefined identifier %s", ident->toChars());
return;
}
else if (ad->aliasthis && s != ad->aliasthis)
{
::error(loc, "there can be only one alias this");
return;
}
if (ad->type->ty == Tstruct && ((TypeStruct *)ad->type)->sym != ad)
{
AggregateDeclaration *ad2 = ((TypeStruct *)ad->type)->sym;
assert(ad2->type == Type::terror);
ad->aliasthis = ad2->aliasthis;
return;
}
/* disable the alias this conversion so the implicit conversion check
* doesn't use it.
*/
ad->aliasthis = NULL;
Dsymbol *sx = s;
if (sx->isAliasDeclaration())
sx = sx->toAlias();
Declaration *d = sx->isDeclaration();
if (d && !d->isTupleDeclaration())
{
Type *t = d->type;
assert(t);
if (ad->type->implicitConvTo(t) > MATCHnomatch)
{
::error(loc, "alias this is not reachable as %s already converts to %s", ad->toChars(), t->toChars());
}
}
ad->aliasthis = s;
semanticRun = PASSsemanticdone;
}
const char *AliasThis::kind() const
{
return "alias this";
}
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