
// Compiler implementation of the D programming language
// Copyright (c) 1999-2010 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com

#include <stdio.h>
#include <stddef.h>
#include <time.h>
#include <assert.h>

#if __sun&&__SVR4
#include <alloca.h>
#endif

#include "mars.h"
#include "module.h"
#include "mtype.h"
#include "declaration.h"
#include "statement.h"
#include "enum.h"
#include "aggregate.h"
#include "init.h"
#include "attrib.h"
#include "id.h"
#include "import.h"
#include "template.h"
#include "lib.h"

#include "rmem.h"
#include "cc.h"
#include "global.h"
#include "oper.h"
#include "code.h"
#include "type.h"
#include "dt.h"
#include "cgcv.h"
#include "outbuf.h"
#include "irstate.h"

struct Environment;

Environment *benv;

void out_config_init();
void slist_add(Symbol *s);
void slist_reset();
void clearStringTab();

#define STATICCTOR      0

elem *eictor;
symbol *ictorlocalgot;
elem *ector;
Array ectorgates;
elem *edtor;
elem *etest;

elem *esharedctor;
Array esharedctorgates;
elem *eshareddtor;

int dtorcount;
int shareddtorcount;

char *lastmname;

/**************************************
 * Append s to list of object files to generate later.
 */

Array obj_symbols_towrite;

void obj_append(Dsymbol *s)
{
    obj_symbols_towrite.push(s);
}

void obj_write_deferred(Library *library)
{
    for (int i = 0; i < obj_symbols_towrite.dim; i++)
    {   Dsymbol *s = (Dsymbol *)obj_symbols_towrite.data[i];
        Module *m = s->getModule();

        char *mname;
        if (m)
        {   mname = m->srcfile->toChars();
            lastmname = mname;
        }
        else
        {
            //mname = s->ident->toChars();
            mname = lastmname;
            assert(mname);
        }

        obj_start(mname);

        static int count;
        count++;                // sequence for generating names

        /* Create a module that's a doppelganger of m, with just
         * enough to be able to create the moduleinfo.
         */
        OutBuffer idbuf;
        idbuf.printf("%s.%d", m ? m->ident->toChars() : mname, count);
        char *idstr = idbuf.toChars();
        idbuf.data = NULL;
        Identifier *id = new Identifier(idstr, TOKidentifier);

        Module *md = new Module(mname, id, 0, 0);
        md->members = new Dsymbols();
        md->members->push(s);   // its only 'member' is s
        if (m)
        {
            md->doppelganger = 1;       // identify this module as doppelganger
            md->md = m->md;
            md->aimports.push(m);       // it only 'imports' m
            md->massert = m->massert;
            md->munittest = m->munittest;
            md->marray = m->marray;
        }

        md->genobjfile(0);

        /* Set object file name to be source name with sequence number,
         * as mangled symbol names get way too long.
         */
        char *fname = FileName::removeExt(mname);
        OutBuffer namebuf;
        unsigned hash = 0;
        for (char *p = s->toChars(); *p; p++)
            hash += *p;
        namebuf.printf("%s_%x_%x.%s", fname, count, hash, global.obj_ext);
        namebuf.writeByte(0);
        mem.free(fname);
        fname = (char *)namebuf.extractData();

        //printf("writing '%s'\n", fname);
        File *objfile = new File(fname);
        obj_end(library, objfile);
    }
    obj_symbols_towrite.dim = 0;
}

/**************************************
 * Prepare for generating obj file.
 */

Outbuffer objbuf;

void obj_start(char *srcfile)
{
    //printf("obj_start()\n");

    out_config_init();

    rtlsym_reset();
    slist_reset();
    clearStringTab();

    obj_init(&objbuf, srcfile, NULL);

    el_reset();
    cg87_reset();
    out_reset();
}

void obj_end(Library *library, File *objfile)
{
    obj_term();

    if (library)
    {
        // Transfer image to library
        library->addObject(objfile->name->toChars(), objbuf.buf, objbuf.p - objbuf.buf);
        objbuf.buf = NULL;
    }
    else
    {
        // Transfer image to file
        objfile->setbuffer(objbuf.buf, objbuf.p - objbuf.buf);
        objbuf.buf = NULL;

        char *p = FileName::path(objfile->name->toChars());
        FileName::ensurePathExists(p);
        //mem.free(p);

        //printf("write obj %s\n", objfile->name->toChars());
        objfile->writev();
    }
    objbuf.pend = NULL;
    objbuf.p = NULL;
    objbuf.len = 0;
    objbuf.inc = 0;
}

/**************************************
 * Generate .obj file for Module.
 */

void Module::genobjfile(int multiobj)
{
    //EEcontext *ee = env->getEEcontext();

    //printf("Module::genobjfile(multiobj = %d) %s\n", multiobj, toChars());

    lastmname = srcfile->toChars();

    obj_initfile(lastmname, NULL, toPrettyChars());

    eictor = NULL;
    ictorlocalgot = NULL;
    ector = NULL;
    ectorgates.setDim(0);
    edtor = NULL;
    esharedctor = NULL;
    esharedctorgates.setDim(0);
    eshareddtor = NULL;
    etest = NULL;
    dtorcount = 0;
    shareddtorcount = 0;

    if (doppelganger)
    {
        /* Generate a reference to the moduleinfo, so the module constructors
         * and destructors get linked in.
         */
        Module *m = (Module *)aimports.data[0];
        assert(m);
        if (m->sictor || m->sctor || m->sdtor)
        {
            Symbol *s = m->toSymbol();
            //objextern(s);
            //if (!s->Sxtrnnum) objextdef(s->Sident);
            if (!s->Sxtrnnum)
            {
                //printf("%s\n", s->Sident);
#if 0 /* This should work, but causes optlink to fail in common/newlib.asm */
                objextdef(s->Sident);
#else
#if ELFOBJ || MACHOBJ
                int nbytes = reftoident(DATA, Offset(DATA), s, 0, CFoff);
                Offset(DATA) += nbytes;
#else
                int nbytes = reftoident(DATA, Doffset, s, 0, CFoff);
                Doffset += nbytes;
#endif
#endif
            }
        }
    }

    if (global.params.cov)
    {
        /* Create coverage identifier:
         *  private uint[numlines] __coverage;
         */
        cov = symbol_calloc("__coverage");
        cov->Stype = type_fake(TYint);
        cov->Stype->Tmangle = mTYman_c;
        cov->Stype->Tcount++;
        cov->Sclass = SCstatic;
        cov->Sfl = FLdata;
#if ELFOBJ || MACHOBJ
        cov->Sseg = UDATA;
#endif
        dtnzeros(&cov->Sdt, 4 * numlines);
        outdata(cov);
        slist_add(cov);

        covb = (unsigned *)calloc((numlines + 32) / 32, sizeof(*covb));
    }

    for (int i = 0; i < members->dim; i++)
    {
        Dsymbol *member = (Dsymbol *)members->data[i];
        member->toObjFile(multiobj);
    }

    if (global.params.cov)
    {
        /* Generate
         *      bit[numlines] __bcoverage;
         */
        Symbol *bcov = symbol_calloc("__bcoverage");
        bcov->Stype = type_fake(TYuint);
        bcov->Stype->Tcount++;
        bcov->Sclass = SCstatic;
        bcov->Sfl = FLdata;
#if ELFOBJ || MACHOBJ
        bcov->Sseg = DATA;
#endif
        dtnbytes(&bcov->Sdt, (numlines + 32) / 32 * sizeof(*covb), (char *)covb);
        outdata(bcov);

        free(covb);
        covb = NULL;

        /* Generate:
         *  _d_cover_register(uint[] __coverage, BitArray __bcoverage, string filename);
         * and prepend it to the static constructor.
         */

        /* t will be the type of the functions generated:
         *      extern (C) void func();
         */
        type *t = type_alloc(TYnfunc);
        t->Tflags |= TFprototype | TFfixed;
        t->Tmangle = mTYman_c;
        t->Tnext = tsvoid;
        tsvoid->Tcount++;

        sictor = toSymbolX("__modictor", SCglobal, t, "FZv");
        cstate.CSpsymtab = &sictor->Sfunc->Flocsym;
        localgot = ictorlocalgot;
        elem *e;

        e = el_params(el_ptr(cov), el_long(TYuint, numlines),
                      el_ptr(bcov), el_long(TYuint, numlines),
                      toEfilename(),
                      NULL);
        e = el_bin(OPcall, TYvoid, el_var(rtlsym[RTLSYM_DCOVER]), e);
        eictor = el_combine(e, eictor);
        ictorlocalgot = localgot;
    }

    // If coverage / static constructor / destructor / unittest calls
    if (eictor || ector || edtor || etest)
    {
        /* t will be the type of the functions generated:
         *      extern (C) void func();
         */
        type *t = type_alloc(TYnfunc);
        t->Tflags |= TFprototype | TFfixed;
        t->Tmangle = mTYman_c;
        t->Tnext = tsvoid;
        tsvoid->Tcount++;

        static char moddeco[] = "FZv";

        if (eictor)
        {
            localgot = ictorlocalgot;

            block *b = block_calloc();
            b->BC = BCret;
            b->Belem = eictor;
            sictor->Sfunc->Fstartblock = b;
            writefunc(sictor);
        }

        if (ector)
        {
            localgot = NULL;
            sctor = toSymbolX("__modctor", SCglobal, t, moddeco);
#if DMDV2
            cstate.CSpsymtab = &sctor->Sfunc->Flocsym;

            for (int i = 0; i < ectorgates.dim; i++)
            {   StaticDtorDeclaration *f = (StaticDtorDeclaration *)ectorgates.data[i];

                Symbol *s = f->vgate->toSymbol();
                elem *e = el_var(s);
                e = el_bin(OPaddass, TYint, e, el_long(TYint, 1));
                ector = el_combine(ector, e);
            }
#endif

            block *b = block_calloc();
            b->BC = BCret;
            b->Belem = ector;
            sctor->Sfunc->Fstartblock = b;
            writefunc(sctor);
#if STATICCTOR
            obj_staticctor(sctor, dtorcount, 1);
#endif
        }

        if (edtor)
        {
            localgot = NULL;
            sdtor = toSymbolX("__moddtor", SCglobal, t, moddeco);

            block *b = block_calloc();
            b->BC = BCret;
            b->Belem = edtor;
            sdtor->Sfunc->Fstartblock = b;
            writefunc(sdtor);
        }

#if DMDV2
        if (esharedctor || esharedctorgates.dim)
        {
            localgot = NULL;
            ssharedctor = toSymbolX("__modsharedctor", SCglobal, t, moddeco);
            cstate.CSpsymtab = &ssharedctor->Sfunc->Flocsym;

            for (int i = 0; i < esharedctorgates.dim; i++)
            {   SharedStaticDtorDeclaration *f = (SharedStaticDtorDeclaration *)esharedctorgates.data[i];

                Symbol *s = f->vgate->toSymbol();
                elem *e = el_var(s);
                e = el_bin(OPaddass, TYint, e, el_long(TYint, 1));
                esharedctor = el_combine(esharedctor, e);
            }

            block *b = block_calloc();
            b->BC = BCret;
            b->Belem = esharedctor;
            ssharedctor->Sfunc->Fstartblock = b;
            writefunc(ssharedctor);
#if STATICCTOR
            obj_staticctor(ssharedctor, shareddtorcount, 1);
#endif
        }

        if (eshareddtor)
        {
            localgot = NULL;
            sshareddtor = toSymbolX("__modshareddtor", SCglobal, t, moddeco);

            block *b = block_calloc();
            b->BC = BCret;
            b->Belem = eshareddtor;
            sshareddtor->Sfunc->Fstartblock = b;
            writefunc(sshareddtor);
        }
#endif

        if (etest)
        {
            localgot = NULL;
            stest = toSymbolX("__modtest", SCglobal, t, moddeco);

            block *b = block_calloc();
            b->BC = BCret;
            b->Belem = etest;
            stest->Sfunc->Fstartblock = b;
            writefunc(stest);
        }

        if (doppelganger)
            genmoduleinfo();
    }

    if (doppelganger)
    {
        obj_termfile();
        return;
    }

    if (global.params.multiobj)
    {   /* This is necessary because the main .obj for this module is written
         * first, but determining whether marray or massert or munittest are needed is done
         * possibly later in the doppelganger modules.
         * Another way to fix it is do the main one last.
         */
        toModuleAssert();
        toModuleArray();
    }

#if 1
    // If module assert
    for (int i = 0; i < 2; i++)
    {
        Symbol *ma;
        unsigned rt;
        switch (i)
        {
            case 0:     ma = marray;    rt = RTLSYM_DARRAY;     break;
            case 1:     ma = massert;   rt = RTLSYM_DASSERT;   break;
            case 2:     ma = munittest; rt = RTLSYM_DUNITTESTM; break;
            default:    assert(0);
        }

        if (ma)
        {
            elem *elinnum;

            localgot = NULL;

            // Call dassert(filename, line)
            // Get sole parameter, linnum
            {
                Symbol *sp = symbol_calloc("linnum");
                sp->Stype = type_fake(TYint);
                sp->Stype->Tcount++;
                sp->Sclass = SCfastpar;
                sp->Spreg = I64 ? DI : AX;
                sp->Sflags &= ~SFLspill;
                sp->Sfl = FLpara;       // FLauto?
                cstate.CSpsymtab = &ma->Sfunc->Flocsym;
                symbol_add(sp);

                elinnum = el_var(sp);
            }

            elem *efilename = toEmodulename();

            elem *e = el_var(rtlsym[rt]);
            e = el_bin(OPcall, TYvoid, e, el_param(elinnum, efilename));

            block *b = block_calloc();
            b->BC = BCret;
            b->Belem = e;
            ma->Sfunc->Fstartblock = b;
            ma->Sclass = SCglobal;
            ma->Sfl = 0;
            writefunc(ma);
        }
    }
#endif

#if 1
    // Always generate module info, because of templates and -cov
    if (1 || needModuleInfo())
        genmoduleinfo();
#endif

    obj_termfile();
}


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

void FuncDeclaration::toObjFile(int multiobj)
{
    Symbol *senter;
    Symbol *sexit;
    FuncDeclaration *func = this;
    ClassDeclaration *cd = func->parent->isClassDeclaration();
    int reverse;
    int i;
    int has_arguments;

    //printf("FuncDeclaration::toObjFile(%p, %s.%s)\n", func, parent->toChars(), func->toChars());
#if 0
    //printf("line = %d\n",func->getWhere() / LINEINC);
    EEcontext *ee = env->getEEcontext();
    if (ee->EEcompile == 2)
    {
        if (ee->EElinnum < (func->getWhere() / LINEINC) ||
            ee->EElinnum > (func->endwhere / LINEINC)
           )
            return;             // don't compile this function
        ee->EEfunc = func->toSymbol();
    }
#endif

    if (multiobj && !isStaticDtorDeclaration() && !isStaticCtorDeclaration())
    {   obj_append(this);
        return;
    }

    if (semanticRun >= PASSobj) // if toObjFile() already run
        return;
    semanticRun = PASSobj;

    if (!func->fbody)
    {
        return;
    }
    if (func->isUnitTestDeclaration() && !global.params.useUnitTests)
        return;

    if (global.params.verbose)
        printf("function  %s\n",func->toChars());

    Symbol *s = func->toSymbol();
    func_t *f = s->Sfunc;

#if TARGET_WINDOS
    /* This is done so that the 'this' pointer on the stack is the same
     * distance away from the function parameters, so that an overriding
     * function can call the nested fdensure or fdrequire of its overridden function
     * and the stack offsets are the same.
     */
    if (isVirtual() && (fensure || frequire))
        f->Fflags3 |= Ffakeeh;
#endif

#if TARGET_OSX
    s->Sclass = SCcomdat;
#else
    s->Sclass = SCglobal;
#endif
    for (Dsymbol *p = parent; p; p = p->parent)
    {
        if (p->isTemplateInstance())
        {
            s->Sclass = SCcomdat;
            break;
        }
    }

    if (isNested())
    {
//      if (!(config.flags3 & CFG3pic))
//          s->Sclass = SCstatic;
        f->Fflags3 |= Fnested;
    }
    else
    {
        const char *libname = (global.params.symdebug)
                                ? global.params.debuglibname
                                : global.params.defaultlibname;

        // Pull in RTL startup code
        if (func->isMain())
        {   objextdef("_main");
#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_SOLARIS
            obj_ehsections();   // initialize exception handling sections
#endif
#if TARGET_WINDOS
            objextdef("__acrtused_con");
#endif
            obj_includelib(libname);
            s->Sclass = SCglobal;
        }
        else if (strcmp(s->Sident, "main") == 0 && linkage == LINKc)
        {
#if TARGET_WINDOS
            objextdef("__acrtused_con");        // bring in C startup code
            obj_includelib("snn.lib");          // bring in C runtime library
#endif
            s->Sclass = SCglobal;
        }
        else if (func->isWinMain())
        {
            objextdef("__acrtused");
            obj_includelib(libname);
            s->Sclass = SCglobal;
        }

        // Pull in RTL startup code
        else if (func->isDllMain())
        {
            objextdef("__acrtused_dll");
            obj_includelib(libname);
            s->Sclass = SCglobal;
        }
    }

    cstate.CSpsymtab = &f->Flocsym;

    // Find module m for this function
    Module *m = NULL;
    for (Dsymbol *p = parent; p; p = p->parent)
    {
        m = p->isModule();
        if (m)
            break;
    }

    IRState irs(m, func);
    Array deferToObj;                   // write these to OBJ file later
    irs.deferToObj = &deferToObj;

    TypeFunction *tf;
    enum RET retmethod;
    symbol *shidden = NULL;
    Symbol *sthis = NULL;
    tym_t tyf;

    tyf = tybasic(s->Stype->Tty);
    //printf("linkage = %d, tyf = x%x\n", linkage, tyf);
    reverse = tyrevfunc(s->Stype->Tty);

    assert(func->type->ty == Tfunction);
    tf = (TypeFunction *)(func->type);
    has_arguments = (tf->linkage == LINKd) && (tf->varargs == 1);
    retmethod = tf->retStyle();
    if (retmethod == RETstack)
    {
        // If function returns a struct, put a pointer to that
        // as the first argument
        ::type *thidden = tf->next->pointerTo()->toCtype();
        char hiddenparam[5+4+1];
        static int hiddenparami;    // how many we've generated so far

        sprintf(hiddenparam,"__HID%d",++hiddenparami);
        shidden = symbol_name(hiddenparam,SCparameter,thidden);
        shidden->Sflags |= SFLtrue | SFLfree;
#if DMDV1
        if (func->nrvo_can && func->nrvo_var && func->nrvo_var->nestedref)
#else
        if (func->nrvo_can && func->nrvo_var && func->nrvo_var->nestedrefs.dim)
#endif
            type_setcv(&shidden->Stype, shidden->Stype->Tty | mTYvolatile);
        irs.shidden = shidden;
        this->shidden = shidden;
    }

    if (vthis)
    {
        assert(!vthis->csym);
        sthis = vthis->toSymbol();
        irs.sthis = sthis;
        if (!(f->Fflags3 & Fnested))
            f->Fflags3 |= Fmember;
    }

    Symbol **params;
    unsigned pi;

    // Estimate number of parameters, pi
    pi = (v_arguments != NULL);
    if (parameters)
        pi += parameters->dim;
    // Allow extra 2 for sthis and shidden
    params = (Symbol **)alloca((pi + 2) * sizeof(Symbol *));

    // Get the actual number of parameters, pi, and fill in the params[]
    pi = 0;
    if (v_arguments)
    {
        params[pi] = v_arguments->toSymbol();
        pi += 1;
    }
    if (parameters)
    {
        for (i = 0; i < parameters->dim; i++)
        {   VarDeclaration *v = (VarDeclaration *)parameters->data[i];
            if (v->csym)
            {
                error("compiler error, parameter '%s', bugzilla 2962?", v->toChars());
                assert(0);
            }
            params[pi + i] = v->toSymbol();
        }
        pi += i;
    }

    if (reverse)
    {   // Reverse params[] entries
        for (i = 0; i < pi/2; i++)
        {
            Symbol *sptmp = params[i];
            params[i] = params[pi - 1 - i];
            params[pi - 1 - i] = sptmp;
        }
    }

    if (shidden)
    {
#if 0
        // shidden becomes last parameter
        params[pi] = shidden;
#else
        // shidden becomes first parameter
        memmove(params + 1, params, pi * sizeof(params[0]));
        params[0] = shidden;
#endif
        pi++;
    }


    if (sthis)
    {
#if 0
        // sthis becomes last parameter
        params[pi] = sthis;
#else
        // sthis becomes first parameter
        memmove(params + 1, params, pi * sizeof(params[0]));
        params[0] = sthis;
#endif
        pi++;
    }

    if ((global.params.isLinux || global.params.isOSX || global.params.isFreeBSD || global.params.isSolaris) &&
         linkage != LINKd && shidden && sthis)
    {
        /* swap shidden and sthis
         */
        Symbol *sp = params[0];
        params[0] = params[1];
        params[1] = sp;
    }

    for (i = 0; i < pi; i++)
    {   Symbol *sp = params[i];
        sp->Sclass = SCparameter;
        sp->Sflags &= ~SFLspill;
        sp->Sfl = FLpara;
        symbol_add(sp);
    }

    // Determine register assignments
    if (pi)
    {
        if (global.params.isX86_64)
        {
            // Order of assignment of pointer or integer parameters
            static const unsigned char argregs[6] = { DI,SI,DX,CX,R8,R9 };
            int r = 0;
            int xmmcnt = XMM0;

            for (int i = 0; i < pi; i++)
            {   Symbol *sp = params[i];
                tym_t ty = tybasic(sp->Stype->Tty);
                // BUG: doesn't work for structs
                if (r < sizeof(argregs)/sizeof(argregs[0]))
                {
                    if (type_jparam(sp->Stype))
                    {
                        sp->Sclass = SCfastpar;
                        sp->Spreg = argregs[r];
                        sp->Sfl = FLauto;
                        ++r;
                    }
                }
                if (xmmcnt < XMM7)
                {
                    if (tyfloating(ty) && tysize(ty) <= 8)
                    {
                        sp->Sclass = SCfastpar;
                        sp->Spreg = xmmcnt;
                        sp->Sfl = FLauto;
                        ++xmmcnt;
                    }
                }
            }
        }
        else
        {
            // First parameter goes in register
            Symbol *sp = params[0];
            if ((tyf == TYjfunc || tyf == TYmfunc) &&
                type_jparam(sp->Stype))
            {   sp->Sclass = SCfastpar;
                sp->Spreg = (tyf == TYjfunc) ? AX : CX;
                sp->Sfl = FLauto;
                //printf("'%s' is SCfastpar\n",sp->Sident);
            }
        }
    }

    if (func->fbody)
    {   block *b;
        Blockx bx;
        Statement *sbody;

        localgot = NULL;

        sbody = func->fbody;
        memset(&bx,0,sizeof(bx));
        bx.startblock = block_calloc();
        bx.curblock = bx.startblock;
        bx.funcsym = s;
        bx.scope_index = -1;
        bx.classdec = cd;
        bx.member = func;
        bx.module = getModule();
        irs.blx = &bx;
#if DMDV2
        buildClosure(&irs);
#endif

#if 0
        if (func->isSynchronized())
        {
            if (cd)
            {   elem *esync;
                if (func->isStatic())
                {   // monitor is in ClassInfo
                    esync = el_ptr(cd->toSymbol());
                }
                else
                {   // 'this' is the monitor
                    esync = el_var(sthis);
                }

                if (func->isStatic() || sbody->usesEH() ||
                    !(config.flags2 & CFG2seh))
                {   // BUG: what if frequire or fensure uses EH?

                    sbody = new SynchronizedStatement(func->loc, esync, sbody);
                }
                else
                {
#if TARGET_WINDOS
                    if (config.flags2 & CFG2seh)
                    {
                        /* The "jmonitor" uses an optimized exception handling frame
                         * which is a little shorter than the more general EH frame.
                         * It isn't strictly necessary.
                         */
                        s->Sfunc->Fflags3 |= Fjmonitor;
                    }
#endif
                    el_free(esync);
                }
            }
            else
            {
                error("synchronized function %s must be a member of a class", func->toChars());
            }
        }
#elif TARGET_WINDOS
        if (func->isSynchronized() && cd && config.flags2 & CFG2seh &&
            !func->isStatic() && !sbody->usesEH())
        {
            /* The "jmonitor" hack uses an optimized exception handling frame
             * which is a little shorter than the more general EH frame.
             */
            s->Sfunc->Fflags3 |= Fjmonitor;
        }
#endif

        sbody->toIR(&irs);
        bx.curblock->BC = BCret;

        f->Fstartblock = bx.startblock;
//      einit = el_combine(einit,bx.init);

        if (isCtorDeclaration())
        {
            assert(sthis);
            for (b = f->Fstartblock; b; b = b->Bnext)
            {
                if (b->BC == BCret)
                {
                    b->BC = BCretexp;
                    b->Belem = el_combine(b->Belem, el_var(sthis));
                }
            }
        }
    }

    // If static constructor
#if DMDV2
    if (isSharedStaticCtorDeclaration())        // must come first because it derives from StaticCtorDeclaration
    {
        elem *e = el_una(OPucall, TYvoid, el_var(s));
        esharedctor = el_combine(esharedctor, e);
    }
    else
#endif
    if (isStaticCtorDeclaration())
    {
        elem *e = el_una(OPucall, TYvoid, el_var(s));
        ector = el_combine(ector, e);
    }

    // If static destructor
#if DMDV2
    if (isSharedStaticDtorDeclaration())        // must come first because it derives from StaticDtorDeclaration
    {
        elem *e;

#if STATICCTOR
        e = el_bin(OPcall, TYvoid, el_var(rtlsym[RTLSYM_FATEXIT]), el_ptr(s));
        esharedctor = el_combine(esharedctor, e);
        shareddtorcount++;
#else
        SharedStaticDtorDeclaration *f = isSharedStaticDtorDeclaration();
        assert(f);
        if (f->vgate)
        {   /* Increment destructor's vgate at construction time
             */
            esharedctorgates.push(f);
        }

        e = el_una(OPucall, TYvoid, el_var(s));
        eshareddtor = el_combine(e, eshareddtor);
#endif
    }
    else
#endif
    if (isStaticDtorDeclaration())
    {
        elem *e;

#if STATICCTOR
        e = el_bin(OPcall, TYvoid, el_var(rtlsym[RTLSYM_FATEXIT]), el_ptr(s));
        ector = el_combine(ector, e);
        dtorcount++;
#else
        StaticDtorDeclaration *f = isStaticDtorDeclaration();
        assert(f);
        if (f->vgate)
        {   /* Increment destructor's vgate at construction time
             */
            Symbol *s = f->vgate->toSymbol();
            e = el_var(s);
            e = el_bin(OPaddass, TYint, e, el_long(TYint, 1));
            ector = el_combine(ector, e);
        }

        e = el_una(OPucall, TYvoid, el_var(s));
        edtor = el_combine(e, edtor);
#endif
    }

    // If unit test
    if (isUnitTestDeclaration())
    {
        elem *e = el_una(OPucall, TYvoid, el_var(s));
        etest = el_combine(etest, e);
    }

    if (global.errors)
        return;

    writefunc(s);
    if (isExport())
        obj_export(s, Poffset);

    for (i = 0; i < irs.deferToObj->dim; i++)
    {
        Dsymbol *s = (Dsymbol *)irs.deferToObj->data[i];
        s->toObjFile(0);
    }

#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_SOLARIS
    // A hack to get a pointer to this function put in the .dtors segment
    if (ident && memcmp(ident->toChars(), "_STD", 4) == 0)
        obj_staticdtor(s);
#endif
#if DMDV2
    if (irs.startaddress)
    {
        printf("Setting start address\n");
        obj_startaddress(irs.startaddress);
    }
#endif
}

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

/*****************************
 * Return back end type corresponding to D front end type.
 */

unsigned Type::totym()
{   unsigned t;

    switch (ty)
    {
        case Tvoid:     t = TYvoid;     break;
        case Tint8:     t = TYschar;    break;
        case Tuns8:     t = TYuchar;    break;
        case Tint16:    t = TYshort;    break;
        case Tuns16:    t = TYushort;   break;
        case Tint32:    t = TYint;      break;
        case Tuns32:    t = TYuint;     break;
        case Tint64:    t = TYllong;    break;
        case Tuns64:    t = TYullong;   break;
        case Tfloat32:  t = TYfloat;    break;
        case Tfloat64:  t = TYdouble;   break;
        case Tfloat80:  t = TYldouble;  break;
        case Timaginary32: t = TYifloat; break;
        case Timaginary64: t = TYidouble; break;
        case Timaginary80: t = TYildouble; break;
        case Tcomplex32: t = TYcfloat;  break;
        case Tcomplex64: t = TYcdouble; break;
        case Tcomplex80: t = TYcldouble; break;
        //case Tbit:    t = TYuchar;    break;
        case Tbool:     t = TYbool;     break;
        case Tchar:     t = TYchar;     break;
#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_SOLARIS
        case Twchar:    t = TYwchar_t;  break;
        case Tdchar:    t = TYdchar;    break;
#else
        case Twchar:    t = TYwchar_t;  break;
        case Tdchar:
                t = (global.params.symdebug == 1) ? TYdchar : TYulong;
                break;
#endif

        case Taarray:   t = TYaarray;   break;
        case Tclass:
        case Treference:
        case Tpointer:  t = TYnptr;     break;
        case Tdelegate: t = TYdelegate; break;
        case Tarray:    t = TYdarray;   break;
#if SARRAYVALUE
        case Tsarray:   t = TYstruct;   break;
#else
        case Tsarray:   t = TYarray;    break;
#endif
        case Tstruct:   t = TYstruct;   break;

        case Tenum:
        case Ttypedef:
             t = toBasetype()->totym();
             break;

        case Tident:
        case Ttypeof:
#ifdef DEBUG
            printf("ty = %d, '%s'\n", ty, toChars());
#endif
            error(0, "forward reference of %s", toChars());
            t = TYint;
            break;

        default:
#ifdef DEBUG
            printf("ty = %d, '%s'\n", ty, toChars());
            halt();
#endif
            assert(0);
    }

#if DMDV2
    // Add modifiers
    switch (mod)
    {
        case 0:
            break;
        case MODconst:
        case MODwild:
            t |= mTYconst;
            break;
        case MODimmutable:
            t |= mTYimmutable;
            break;
        case MODshared:
            t |= mTYshared;
            break;
        case MODshared | MODwild:
        case MODshared | MODconst:
            t |= mTYshared | mTYconst;
            break;
        default:
            assert(0);
    }
#endif

    return t;
}

unsigned TypeFunction::totym()
{
    tym_t tyf;

    //printf("TypeFunction::totym(), linkage = %d\n", linkage);
    switch (linkage)
    {
        case LINKwindows:
            tyf = (varargs == 1) ? TYnfunc : TYnsfunc;
            break;

        case LINKpascal:
            tyf = (varargs == 1) ? TYnfunc : TYnpfunc;
            break;

        case LINKc:
            tyf = TYnfunc;
#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_SOLARIS
            if (I32 && retStyle() == RETstack)
                tyf = TYhfunc;
#endif
            break;

        case LINKd:
            tyf = (varargs == 1) ? TYnfunc : TYjfunc;
            break;

        case LINKcpp:
            tyf = TYnfunc;
            break;

        default:
            printf("linkage = %d\n", linkage);
            assert(0);
    }
#if DMDV2
    if (isnothrow)
        tyf |= mTYnothrow;
#endif
    return tyf;
}

/**************************************
 */

Symbol *Type::toSymbol()
{
    assert(0);
    return NULL;
}

Symbol *TypeClass::toSymbol()
{
    return sym->toSymbol();
}

/*************************************
 * Generate symbol in data segment for critical section.
 */

Symbol *Module::gencritsec()
{
    Symbol *s;
    type *t;

    t = Type::tint32->toCtype();
    s = symbol_name("critsec", SCstatic, t);
    s->Sfl = FLdata;
    /* Must match D_CRITICAL_SECTION in phobos/internal/critical.c
     */
    dtnzeros(&s->Sdt, PTRSIZE + os_critsecsize());
#if ELFOBJ || MACHOBJ // Burton
    s->Sseg = DATA;
#endif
    outdata(s);
    return s;
}

/**************************************
 * Generate elem that is a pointer to the module file name.
 */

elem *Module::toEmodulename()
{
   elem *efilename;

    // Get filename
    if (needModuleInfo())
    {   Symbol *si;

        /* Class ModuleInfo is defined in std.moduleinfo.
         * The first member is the name of it, char name[],
         * which will be at offset 8.
         */

        si = toSymbol();
#if 1
        // Use this instead so -fPIC will work
        efilename = el_ptr(si);
        efilename = el_bin(OPadd, TYnptr, efilename, el_long(TYuint, 8));
        efilename = el_una(OPind, TYdarray, efilename);
#else
        efilename = el_var(si);
        efilename->Ety = TYdarray;
        efilename->EV.sp.Voffset += 8;
#endif
    }
    else // generate our own filename
    {
        efilename = toEfilename();
    }
    return efilename;
}

elem *Module::toEfilename()
{   elem *efilename;

    if (!sfilename)
    {
        dt_t *dt = NULL;
        char *id;
        int len;

        id = srcfile->toChars();
        len = strlen(id);
        dtsize_t(&dt, len);
        dtabytes(&dt,TYnptr, 0, len + 1, id);

        sfilename = symbol_generate(SCstatic,type_fake(TYdarray));
        sfilename->Sdt = dt;
        sfilename->Sfl = FLdata;
#if ELFOBJ
        sfilename->Sseg = CDATA;
#endif
#if MACHOBJ
        // Because of PIC and CDATA being in the _TEXT segment, cannot
        // have pointers in CDATA
        sfilename->Sseg = DATA;
#endif
        outdata(sfilename);
    }

    efilename = el_var(sfilename);
    return efilename;
}


