예제 #1
0
파일: enum.c 프로젝트: rbanderton/dmd
void EnumDeclaration::semantic(Scope *sc)
{
    //printf("EnumDeclaration::semantic(sd = %p, '%s') %s\n", sc->scopesym, sc->scopesym->toChars(), toChars());
    //printf("EnumDeclaration::semantic() %p %s\n", this, toChars());
    if (semanticRun >= PASSsemanticdone)
        return;             // semantic() already completed
    if (semanticRun == PASSsemantic)
    {
        assert(memtype);
        ::error(loc, "circular reference to enum base type %s", memtype->toChars());
        errors = true;
        semanticRun = PASSsemanticdone;
        return;
    }
    unsigned dprogress_save = Module::dprogress;

    Scope *scx = NULL;
    if (scope)
    {
        sc = scope;
        scx = scope;            // save so we don't make redundant copies
        scope = NULL;
    }

    parent = sc->parent;
    type = type->semantic(loc, sc);

    protection = sc->protection;
    if (sc->stc & STCdeprecated)
        isdeprecated = true;
    userAttribDecl = sc->userAttribDecl;

    semanticRun = PASSsemantic;

    if (!members && !memtype)               // enum ident;
    {
        semanticRun = PASSsemanticdone;
        return;
    }

    if (!symtab)
        symtab = new DsymbolTable();

    /* The separate, and distinct, cases are:
     *  1. enum { ... }
     *  2. enum : memtype { ... }
     *  3. enum ident { ... }
     *  4. enum ident : memtype { ... }
     *  5. enum ident : memtype;
     *  6. enum ident;
     */

    if (memtype)
    {
        memtype = memtype->semantic(loc, sc);

        /* Check to see if memtype is forward referenced
         */
        if (memtype->ty == Tenum)
        {
            EnumDeclaration *sym = (EnumDeclaration *)memtype->toDsymbol(sc);
            if (!sym->memtype || !sym->members || !sym->symtab || sym->scope)
            {
                // memtype is forward referenced, so try again later
                scope = scx ? scx : sc->copy();
                scope->setNoFree();
                scope->module->addDeferredSemantic(this);
                Module::dprogress = dprogress_save;
                //printf("\tdeferring %s\n", toChars());
                semanticRun = PASSinit;
                return;
            }
        }
        if (memtype->ty == Tvoid)
        {
            error("base type must not be void");
            memtype = Type::terror;
        }
        if (memtype->ty == Terror)
        {
            errors = true;
            if (members)
            {
                for (size_t i = 0; i < members->dim; i++)
                {
                    Dsymbol *s = (*members)[i];
                    s->errors = true;               // poison all the members
                }
            }
            semanticRun = PASSsemanticdone;
            return;
        }
    }

    semanticRun = PASSsemanticdone;

    if (!members)               // enum ident : memtype;
        return;

    if (members->dim == 0)
    {
        error("enum %s must have at least one member", toChars());
        errors = true;
        return;
    }

    Module::dprogress++;

    Scope *sce;
    if (isAnonymous())
        sce = sc;
    else
    {
        sce = sc->push(this);
        sce->parent = this;
    }
    sce = sce->startCTFE();
    sce->setNoFree();                   // needed for getMaxMinValue()

    /* Each enum member gets the sce scope
     */
    for (size_t i = 0; i < members->dim; i++)
    {
        EnumMember *em = (*members)[i]->isEnumMember();
        if (em)
            em->scope = sce;
    }

    if (!added)
    {
        /* addMember() is not called when the EnumDeclaration appears as a function statement,
         * so we have to do what addMember() does and install the enum members in the right symbol
         * table
         */
        ScopeDsymbol *scopesym = NULL;
        if (isAnonymous())
        {
            /* Anonymous enum members get added to enclosing scope.
             */
            for (Scope *sct = sce; 1; sct = sct->enclosing)
            {
                assert(sct);
                if (sct->scopesym)
                {
                    scopesym = sct->scopesym;
                    if (!sct->scopesym->symtab)
                        sct->scopesym->symtab = new DsymbolTable();
                    break;
                }
            }
        }
        else
        {
            // Otherwise enum members are in the EnumDeclaration's symbol table
            scopesym = this;
        }

        for (size_t i = 0; i < members->dim; i++)
        {
            EnumMember *em = (*members)[i]->isEnumMember();
            if (em)
            {
                em->ed = this;
                em->addMember(sc, scopesym, 1);
            }
        }
    }

    for (size_t i = 0; i < members->dim; i++)
    {
        EnumMember *em = (*members)[i]->isEnumMember();
        if (em)
            em->semantic(em->scope);
    }
    //printf("defaultval = %lld\n", defaultval);

    //if (defaultval) printf("defaultval: %s %s\n", defaultval->toChars(), defaultval->type->toChars());
    //printf("members = %s\n", members->toChars());
}
예제 #2
0
파일: enum.c 프로젝트: rbanderton/dmd
void EnumMember::semantic(Scope *sc)
{
    //printf("EnumMember::semantic() %s\n", toChars());
    if (errors || semanticRun >= PASSsemanticdone)
        return;
    if (semanticRun == PASSsemantic)
    {
        error("circular reference to enum member");
    Lerrors:
        errors = true;
        semanticRun = PASSsemanticdone;
        return;
    }
    assert(ed);
    ed->semantic(sc);
    if (ed->errors)
        goto Lerrors;

    if (errors || semanticRun >= PASSsemanticdone)
        return;

    semanticRun = PASSsemantic;
    if (scope)
        sc = scope;

    // The first enum member is special
    bool first = (this == (*ed->members)[0]);

    if (type)
    {
        type = type->semantic(loc, sc);
        assert(value);          // "type id;" is not a valid enum member declaration
    }

    if (value)
    {
        Expression *e = value;
        assert(e->dyncast() == DYNCAST_EXPRESSION);
        e = e->semantic(sc);
        e = resolveProperties(sc, e);
        e = e->ctfeInterpret();
        if (e->op == TOKerror)
            goto Lerrors;
        if (first && !ed->memtype && !ed->isAnonymous())
        {
            ed->memtype = e->type;
            if (ed->memtype->ty == Terror)
            {
                ed->errors = true;
                goto Lerrors;
            }
            if (ed->memtype->ty != Terror)
            {
                /* Bugzilla 11746: All of named enum members should have same type
                 * with the first member. If the following members were referenced
                 * during the first member semantic, their types should be unified.
                 */
                for (size_t i = 0; i < ed->members->dim; i++)
                {
                    EnumMember *em = (*ed->members)[i]->isEnumMember();
                    if (!em || em == this || em->semanticRun < PASSsemanticdone || em->type)
                        continue;

                    //printf("[%d] em = %s, em->semanticRun = %d\n", i, toChars(), em->semanticRun);
                    Expression *e = em->value;
                    e = e->implicitCastTo(sc, ed->memtype);
                    e = e->ctfeInterpret();
                    e = e->castTo(sc, ed->type);
                    if (e->op == TOKerror)
                        ed->errors = true;
                    em->value = e;
                }
                if (ed->errors)
                {
                    ed->memtype = Type::terror;
                    goto Lerrors;
                }
            }
        }

        if (ed->memtype && !type)
        {
            e = e->implicitCastTo(sc, ed->memtype);
            e = e->ctfeInterpret();

            // save origValue for better json output
            origValue = e;

            if (!ed->isAnonymous())
                e = e->castTo(sc, ed->type);
        }
        else if (type)
        {
            e = e->implicitCastTo(sc, type);
            e = e->ctfeInterpret();
            assert(ed->isAnonymous());

            // save origValue for better json output
            origValue = e;
        }
        value = e;
    }
    else if (first)
    {
        Type *t;
        if (ed->memtype)
            t = ed->memtype;
        else
        {
            t = Type::tint32;
            if (!ed->isAnonymous())
                ed->memtype = t;
        }
        Expression *e = new IntegerExp(loc, 0, Type::tint32);
        e = e->implicitCastTo(sc, t);
        e = e->ctfeInterpret();

        // save origValue for better json output
        origValue = e;

        if (!ed->isAnonymous())
            e = e->castTo(sc, ed->type);
        value = e;
    }
    else
    {
        /* Find the previous enum member,
         * and set this to be the previous value + 1
         */
        EnumMember *emprev = NULL;
        for (size_t i = 0; i < ed->members->dim; i++)
        {
            EnumMember *em = (*ed->members)[i]->isEnumMember();
            if (em)
            {
                if (em == this)
                    break;
                emprev = em;
            }
        }
        assert(emprev);
        if (emprev->semanticRun < PASSsemanticdone)    // if forward reference
            emprev->semantic(emprev->scope);    // resolve it
        if (emprev->errors)
            goto Lerrors;

        Expression *eprev = emprev->value;
        Type *tprev = eprev->type->equals(ed->type) ? ed->memtype : eprev->type;

        Expression *emax = tprev->getProperty(ed->loc, Id::max, 0);
        emax = emax->semantic(sc);
        emax = emax->ctfeInterpret();

        // Set value to (eprev + 1).
        // But first check that (eprev != emax)
        assert(eprev);
        Expression *e = new EqualExp(TOKequal, loc, eprev, emax);
        e = e->semantic(sc);
        e = e->ctfeInterpret();
        if (e->toInteger())
        {
            error("initialization with (%s.%s + 1) causes overflow for type '%s'", emprev->ed->toChars(), emprev->toChars(), ed->type->toBasetype()->toChars());
            goto Lerrors;
        }

        // Now set e to (eprev + 1)
        e = new AddExp(loc, eprev, new IntegerExp(loc, 1, Type::tint32));
        e = e->semantic(sc);
        e = e->castTo(sc, eprev->type);
        e = e->ctfeInterpret();

        // save origValue (without cast) for better json output
        if (e->op != TOKerror)  // avoid duplicate diagnostics
        {
            assert(emprev->origValue);
            origValue = new AddExp(loc, emprev->origValue, new IntegerExp(loc, 1, Type::tint32));
            origValue = origValue->semantic(sc);
            origValue = origValue->ctfeInterpret();
        }

        if (e->op == TOKerror)
            goto Lerrors;
        if (e->type->isfloating())
        {
            // Check that e != eprev (not always true for floats)
            Expression *etest = new EqualExp(TOKequal, loc, e, eprev);
            etest = etest->semantic(sc);
            etest = etest->ctfeInterpret();
            if (etest->toInteger())
            {
                error("has inexact value, due to loss of precision");
                goto Lerrors;
            }
        }
        value = e;
    }

    assert(origValue);
    semanticRun = PASSsemanticdone;
}