root/branches/dmdfe/enum.c

// Copyright (c) 1999-2006 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 <assert.h>

#include "root.h"
#include "enum.h"
#include "mtype.h"
#include "scope.h"

/********************************* EnumDeclaration ****************************/

EnumDeclaration::EnumDeclaration(Loc loc, Identifier *id, Type *memtype)
    : ScopeDsymbol(id)
{
    this->loc = loc;
    type = new TypeEnum(this);
    this->memtype = memtype;
    maxval = 0;
    minval = 0;
    defaultval = 0;
    sinit = NULL;
}

Dsymbol *EnumDeclaration::syntaxCopy(Dsymbol *s)
{
    Type *t = NULL;
    if (memtype)
    t = memtype->syntaxCopy();

    EnumDeclaration *ed;
    if (s)
    {   ed = (EnumDeclaration *)s;
    ed->memtype = t;
    }
    else
    ed = new EnumDeclaration(loc, ident, t);
    ScopeDsymbol::syntaxCopy(ed);
    return ed;
}

void EnumDeclaration::semantic(Scope *sc)
{   int i;
    uinteger_t number;
    Type *t;
    Scope *sce;

    //printf("EnumDeclaration::semantic(sd = %p, '%s')\n", sc->scopesym, sc->scopesym->toChars());
    if (symtab)         // if already done
    return;
    if (!memtype)
    memtype = Type::tint32;
    parent = sc->scopesym;
    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)
    {
        error("base enum %s is forward referenced", sym->toChars());
        memtype = Type::tint32;
    }
    }

    if (!memtype->isintegral())
    {   error("base type must be of integral type, not %s", memtype->toChars());
    memtype = Type::tint32;
    }

    t = isAnonymous() ? memtype : type;
    symtab = new DsymbolTable();
    sce = sc->push(this);
    sce->parent = this;
    number = 0;
    if (!members)       // enum ident;
    return;
    if (members->dim == 0)
    error("enum %s must have at least one member", toChars());
    int first = 1;
    for (i = 0; i < members->dim; i++)
    {
    EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
    Expression *e;

    if (!em)
        /* The e->semantic(sce) can insert other symbols, such as
         * template instances and function literals.
         */
        continue;

    //printf("Enum member '%s'\n",em->toChars());
    e = em->value;
    if (e)
    {
        assert(e->dyncast() == DYNCAST_EXPRESSION);
        e = e->semantic(sce);
        e = e->optimize(WANTvalue);
        // Need to copy it because we're going to change the type
        e = e->copy();
        e = e->implicitCastTo(sc, memtype);
        e = e->optimize(WANTvalue);
        number = e->toInteger();
        e->type = t;
    }
    else
    {   // Default is the previous number plus 1

        // Check for overflow
        if (!first)
        {
        switch (t->toBasetype()->ty)
        {
            case Tbool:
            if (number == 2)    goto Loverflow;
            break;

            case Tint8:
            if (number == 128) goto Loverflow;
            break;

            case Tchar:
            case Tuns8:
            if (number == 256) goto Loverflow;
            break;

            case Tint16:
            if (number == 0x8000) goto Loverflow;
            break;

            case Twchar:
            case Tuns16:
            if (number == 0x10000) goto Loverflow;
            break;

            case Tint32:
            if (number == 0x80000000) goto Loverflow;
            break;

            case Tdchar:
            case Tuns32:
            if (number == 0x100000000LL) goto Loverflow;
            break;

            case Tint64:
            if (number == 0x8000000000000000LL) goto Loverflow;
            break;

            case Tuns64:
            if (number == 0) goto Loverflow;
            break;

            Loverflow:
            error("overflow of enum value");
            break;

            default:
            assert(0);
        }
        }
        e = new IntegerExp(em->loc, number, t);
    }
    em->value = e;

    // Add to symbol table only after evaluating 'value'
    if (isAnonymous())
    {
        //sce->enclosing->insert(em);
        for (Scope *scx = sce->enclosing; scx; scx = scx->enclosing)
        {
        if (scx->scopesym)
        {
            if (!scx->scopesym->symtab)
            scx->scopesym->symtab = new DsymbolTable();
            em->addMember(sce, scx->scopesym, 1);
            break;
        }
        }
    }
    else
        em->addMember(sc, this, 1);

    if (first)
    {   first = 0;
        defaultval = number;
        minval = number;
        maxval = number;
    }
    else if (memtype->isunsigned())
    {
        if (number < minval)
        minval = number;
        if (number > maxval)
        maxval = number;
    }
    else
    {
        if ((sinteger_t)number < (sinteger_t)minval)
        minval = number;
        if ((sinteger_t)number > (sinteger_t)maxval)
        maxval = number;
    }

    number++;
    }
    //printf("defaultval = %lld\n", defaultval);

    sce->pop();
    //members->print();
}

int EnumDeclaration::oneMember(Dsymbol **ps)
{
    if (isAnonymous())
    return Dsymbol::oneMembers(members, ps);
    return Dsymbol::oneMember(ps);
}

void EnumDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{   int i;

    buf->writestring("enum ");
    if (ident)
    {   buf->writestring(ident->toChars());
    buf->writeByte(' ');
    }
    if (memtype)
    {
    buf->writestring(": ");
    memtype->toCBuffer(buf, NULL, hgs);
    }
    if (!members)
    {
    buf->writeByte(';');
    buf->writenl();
    return;
    }
    buf->writenl();
    buf->writeByte('{');
    buf->writenl();
    for (i = 0; i < members->dim; i++)
    {
    EnumMember *em = ((Dsymbol *)members->data[i])->isEnumMember();
    if (!em)
        continue;
    //buf->writestring("    ");
    em->toCBuffer(buf, hgs);
    buf->writeByte(',');
    buf->writenl();
    }
    buf->writeByte('}');
    buf->writenl();
}

Type *EnumDeclaration::getType()
{
    return type;
}

char *EnumDeclaration::kind()
{
    return "enum";
}

/********************************* EnumMember ****************************/

EnumMember::EnumMember(Loc loc, Identifier *id, Expression *value)
    : Dsymbol(id)
{
    this->value = value;
    this->loc = loc;
}

Dsymbol *EnumMember::syntaxCopy(Dsymbol *s)
{
    Expression *e = NULL;
    if (value)
    e = value->syntaxCopy();

    EnumMember *em;
    if (s)
    {   em = (EnumMember *)s;
    em->loc = loc;
    em->value = e;
    }
    else
    em = new EnumMember(loc, ident, e);
    return em;
}

void EnumMember::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{
    buf->writestring(ident->toChars());
    if (value)
    {
    buf->writestring(" = ");
    value->toCBuffer(buf, hgs);
    }
}

char *EnumMember::kind()
{
    return "enum member";
}