root/branches/dmdfe-2.0/cond.c

// Compiler implementation of the D programming language
// Copyright (c) 1999-2008 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 "id.h"
#include "init.h"
#include "declaration.h"
#include "identifier.h"
#include "expression.h"
#include "cond.h"
#include "module.h"
#include "template.h"
#include "lexer.h"
#ifdef _DH
#include "mtype.h"
#include "scope.h"
#endif

int findCondition(Array *ids, Identifier *ident)
{
    if (ids)
    {
    for (int i = 0; i < ids->dim; i++)
    {
        const char *id = (const char *)ids->data[i];

        if (strcmp(id, ident->toChars()) == 0)
        return TRUE;
    }
    }

    return FALSE;
}

/* ============================================================ */

Condition::Condition(Loc loc)
{
    this->loc = loc;
    inc = 0;
}

/* ============================================================ */

DVCondition::DVCondition(Module *mod, unsigned level, Identifier *ident)
    : Condition(0)
{
    this->mod = mod;
    this->level = level;
    this->ident = ident;
}

Condition *DVCondition::syntaxCopy()
{
    return this;    // don't need to copy
}

/* ============================================================ */

void DebugCondition::setGlobalLevel(unsigned level)
{
    global.params.debuglevel = level;
}

void DebugCondition::addGlobalIdent(const char *ident)
{
    if (!global.params.debugids)
    global.params.debugids = new Array();
    global.params.debugids->push((void *)ident);
}


DebugCondition::DebugCondition(Module *mod, unsigned level, Identifier *ident)
    : DVCondition(mod, level, ident)
{
}

int DebugCondition::include(Scope *sc, ScopeDsymbol *s)
{
    //printf("DebugCondition::include() level = %d, debuglevel = %d\n", level, global.params.debuglevel);
    if (inc == 0)
    {
    inc = 2;
    if (ident)
    {
        if (findCondition(mod->debugids, ident))
        inc = 1;
        else if (findCondition(global.params.debugids, ident))
        inc = 1;
        else
        {   if (!mod->debugidsNot)
            mod->debugidsNot = new Array();
        mod->debugidsNot->push(ident->toChars());
        }
    }
    else if (level <= global.params.debuglevel || level <= mod->debuglevel)
        inc = 1;
    }
    return (inc == 1);
}

void DebugCondition::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{
    if (ident)
    buf->printf("debug (%s)", ident->toChars());
    else
    buf->printf("debug (%u)", level);
}

/* ============================================================ */

void VersionCondition::setGlobalLevel(unsigned level)
{
    global.params.versionlevel = level;
}

void VersionCondition::checkPredefined(Loc loc, const char *ident)
{
    static const char* reserved[] =
    {
    "DigitalMars", "X86", "X86_64",
    "Windows", "Win32", "Win64",
    "linux",
    "LittleEndian", "BigEndian",
    "all",
    "none",
    };

    for (unsigned i = 0; i < sizeof(reserved) / sizeof(reserved[0]); i++)
    {
    if (strcmp(ident, reserved[i]) == 0)
        goto Lerror;
    }

    if (ident[0] == 'D' && ident[1] == '_')
    goto Lerror;

    return;

  Lerror:
    error(loc, "version identifier '%s' is reserved and cannot be set", ident);
}

void VersionCondition::addGlobalIdent(const char *ident)
{
    checkPredefined(0, ident);
    addPredefinedGlobalIdent(ident);
}

void VersionCondition::addPredefinedGlobalIdent(const char *ident)
{
    if (!global.params.versionids)
    global.params.versionids = new Array();
    global.params.versionids->push((void *)ident);
}


VersionCondition::VersionCondition(Module *mod, unsigned level, Identifier *ident)
    : DVCondition(mod, level, ident)
{
}

int VersionCondition::include(Scope *sc, ScopeDsymbol *s)
{
    //printf("VersionCondition::include() level = %d, versionlevel = %d\n", level, global.params.versionlevel);
    //if (ident) printf("\tident = '%s'\n", ident->toChars());
    if (inc == 0)
    {
    inc = 2;
    if (ident)
    {
        if (findCondition(mod->versionids, ident))
        inc = 1;
        else if (findCondition(global.params.versionids, ident))
        inc = 1;
        else
        {
        if (!mod->versionidsNot)
            mod->versionidsNot = new Array();
        mod->versionidsNot->push(ident->toChars());
        }
    }
    else if (level <= global.params.versionlevel || level <= mod->versionlevel)
        inc = 1;
    }
    return (inc == 1);
}

void VersionCondition::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{
    if (ident)
    buf->printf("version (%s)", ident->toChars());
    else
    buf->printf("version (%u)", level);
}


/**************************** StaticIfCondition *******************************/

StaticIfCondition::StaticIfCondition(Loc loc, Expression *exp)
    : Condition(loc)
{
    this->exp = exp;
}

Condition *StaticIfCondition::syntaxCopy()
{
    return new StaticIfCondition(loc, exp->syntaxCopy());
}

int StaticIfCondition::include(Scope *sc, ScopeDsymbol *s)
{
#if 0
    printf("StaticIfCondition::include(sc = %p, s = %p)\n", sc, s);
    if (s)
    {
    printf("\ts = '%s', kind = %s\n", s->toChars(), s->kind());
    }
#endif
    if (inc == 0)
    {
    if (!sc)
    {
        error(loc, "static if conditional cannot be at global scope");
        inc = 2;
        return 0;
    }

    sc = sc->push(sc->scopesym);
    sc->sd = s;         // s gets any addMember()
    sc->flags |= SCOPEstaticif;
    Expression *e = exp->semantic(sc);
    sc->pop();
    e = e->optimize(WANTvalue | WANTinterpret);
    if (e->isBool(TRUE))
        inc = 1;
    else if (e->isBool(FALSE))
        inc = 2;
    else
    {
        e->error("expression %s is not constant or does not evaluate to a bool", e->toChars());
        inc = 2;
    }
    }
    return (inc == 1);
}

void StaticIfCondition::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{
    buf->writestring("static if(");
    exp->toCBuffer(buf, hgs);
    buf->writeByte(')');
}


/**************************** IftypeCondition *******************************/

IftypeCondition::IftypeCondition(Loc loc, Type *targ, Identifier *id, enum TOK tok, Type *tspec)
    : Condition(loc)
{
    this->targ = targ;
    this->id = id;
    this->tok = tok;
    this->tspec = tspec;
}

Condition *IftypeCondition::syntaxCopy()
{
    return new IftypeCondition(loc,
    targ->syntaxCopy(),
    id,
    tok,
    tspec ? tspec->syntaxCopy() : NULL);
}

int IftypeCondition::include(Scope *sc, ScopeDsymbol *sd)
{
    //printf("IftypeCondition::include()\n");
    if (inc == 0)
    {
    if (!sc)
    {
        error(loc, "iftype conditional cannot be at global scope");
        inc = 2;
        return 0;
    }
    unsigned errors = global.errors;
    global.gag++;           // suppress printing of error messages
    targ = targ->semantic(loc, sc);
    global.gag--;
    if (errors != global.errors)    // if any errors happened
    {   inc = 2;            // then condition is false
        global.errors = errors;
    }
    else if (id && tspec)
    {
        /* Evaluate to TRUE if targ matches tspec.
         * If TRUE, declare id as an alias for the specialized type.
         */

        MATCH m;
        TemplateTypeParameter tp(loc, id, NULL, NULL);

        TemplateParameters parameters;
        parameters.setDim(1);
        parameters.data[0] = (void *)&tp;

        Objects dedtypes;
        dedtypes.setDim(1);

        m = targ->deduceType(NULL, tspec, &parameters, &dedtypes);
        if (m == MATCHnomatch ||
        (m != MATCHexact && tok == TOKequal))
        inc = 2;
        else
        {
        inc = 1;
        Type *tded = (Type *)dedtypes.data[0];
        if (!tded)
            tded = targ;
        Dsymbol *s = new AliasDeclaration(loc, id, tded);
        s->semantic(sc);
        sc->insert(s);
        if (sd)
            s->addMember(sc, sd, 1);
        }
    }
    else if (id)
    {
        /* Declare id as an alias for type targ. Evaluate to TRUE
         */
        Dsymbol *s = new AliasDeclaration(loc, id, targ);
        s->semantic(sc);
        sc->insert(s);
        if (sd)
        s->addMember(sc, sd, 1);
        inc = 1;
    }
    else if (tspec)
    {
        /* Evaluate to TRUE if targ matches tspec
         */
        tspec = tspec->semantic(loc, sc);
        //printf("targ  = %s\n", targ->toChars());
        //printf("tspec = %s\n", tspec->toChars());
        if (tok == TOKcolon)
        {   if (targ->implicitConvTo(tspec))
            inc = 1;
        else
            inc = 2;
        }
        else /* == */
        {   if (targ->equals(tspec))
            inc = 1;
        else
            inc = 2;
        }
    }
    else
         inc = 1;
    //printf("inc = %d\n", inc);
    }
    return (inc == 1);
}

void IftypeCondition::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
{
    buf->writestring("iftype(");
    targ->toCBuffer(buf, id, hgs);
    if (tspec)
    {
    if (tok == TOKcolon)
        buf->writestring(" : ");
    else
        buf->writestring(" == ");
    tspec->toCBuffer(buf, NULL, hgs);
    }
    buf->writeByte(')');
}