ldc/gen/typinf.c

// Copyright (c) 1999-2004 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// 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 <cstdio>
#include <cassert>

#include "gen/llvm.h"

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

#include "gen/irstate.h"
#include "gen/logger.h"
#include "gen/runtime.h"
#include "gen/tollvm.h"
#include "gen/arrays.h"

/*******************************************
 * Get a canonicalized form of the TypeInfo for use with the internal
 * runtime library routines. Canonicalized in that static arrays are
 * represented as dynamic arrays, enums are represented by their
 * underlying type, etc. This reduces the number of TypeInfo's needed,
 * so we can use the custom internal ones more.
 */

Expression *Type::getInternalTypeInfo(Scope *sc)
{   TypeInfoDeclaration *tid;
    Expression *e;
    Type *t;
    static TypeInfoDeclaration *internalTI[TMAX];

    //printf("Type::getInternalTypeInfo() %s\n", toChars());
    t = toBasetype();
    switch (t->ty)
    {
    case Tsarray:
        t = t->next->arrayOf(); // convert to corresponding dynamic array type
        break;

    case Tclass:
        if (((TypeClass *)t)->sym->isInterfaceDeclaration())
        break;
        goto Linternal;

    case Tarray:
        if (t->next->ty != Tclass)
        break;
        goto Linternal;

    case Tfunction:
    case Tdelegate:
    case Tpointer:
    Linternal:
        tid = internalTI[t->ty];
        if (!tid)
        {   tid = new TypeInfoDeclaration(t, 1);
        internalTI[t->ty] = tid;
        }
        e = new VarExp(0, tid);
        //e = e->addressOf(sc);
        e->type = tid->type;    // do this so we don't get redundant dereference
        return e;

    default:
        break;
    }
    //printf("\tcalling getTypeInfo() %s\n", t->toChars());
    return t->getTypeInfo(sc);
}


/****************************************************
 * Get the exact TypeInfo.
 */

Expression *Type::getTypeInfo(Scope *sc)
{
    Expression *e;
    Type *t;

    //printf("Type::getTypeInfo() %p, %s\n", this, toChars());
    t = merge();    // do this since not all Type's are merge'd
    if (!t->vtinfo)
    {   t->vtinfo = t->getTypeInfoDeclaration();
    assert(t->vtinfo);

    /* If this has a custom implementation in std/typeinfo, then
     * do not generate a COMDAT for it.
     */
    if (!t->builtinTypeInfo())
    {   // Generate COMDAT
        if (sc)         // if in semantic() pass
        {   // Find module that will go all the way to an object file
        Module *m = sc->module->importedFrom;
        m->members->push(t->vtinfo);
        }
        else            // if in obj generation pass
        {
        t->vtinfo->toObjFile();
        }
    }
    }
    e = new VarExp(0, t->vtinfo);
    //e = e->addressOf(sc);
    e->type = t->vtinfo->type;      // do this so we don't get redundant dereference
    return e;
}

enum RET TypeFunction::retStyle()
{
    return RETstack;
}

TypeInfoDeclaration *Type::getTypeInfoDeclaration()
{
    //printf("Type::getTypeInfoDeclaration() %s\n", toChars());
    return new TypeInfoDeclaration(this, 0);
}

TypeInfoDeclaration *TypeTypedef::getTypeInfoDeclaration()
{
    return new TypeInfoTypedefDeclaration(this);
}

TypeInfoDeclaration *TypePointer::getTypeInfoDeclaration()
{
    return new TypeInfoPointerDeclaration(this);
}

TypeInfoDeclaration *TypeDArray::getTypeInfoDeclaration()
{
    return new TypeInfoArrayDeclaration(this);
}

TypeInfoDeclaration *TypeSArray::getTypeInfoDeclaration()
{
    return new TypeInfoStaticArrayDeclaration(this);
}

TypeInfoDeclaration *TypeAArray::getTypeInfoDeclaration()
{
    return new TypeInfoAssociativeArrayDeclaration(this);
}

TypeInfoDeclaration *TypeStruct::getTypeInfoDeclaration()
{
    return new TypeInfoStructDeclaration(this);
}

TypeInfoDeclaration *TypeClass::getTypeInfoDeclaration()
{
    if (sym->isInterfaceDeclaration())
    return new TypeInfoInterfaceDeclaration(this);
    else
    return new TypeInfoClassDeclaration(this);
}

TypeInfoDeclaration *TypeEnum::getTypeInfoDeclaration()
{
    return new TypeInfoEnumDeclaration(this);
}

TypeInfoDeclaration *TypeFunction::getTypeInfoDeclaration()
{
    return new TypeInfoFunctionDeclaration(this);
}

TypeInfoDeclaration *TypeDelegate::getTypeInfoDeclaration()
{
    return new TypeInfoDelegateDeclaration(this);
}

TypeInfoDeclaration *TypeTuple::getTypeInfoDeclaration()
{
    return new TypeInfoTupleDeclaration(this);
}


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

/* These decide if there's an instance for them already in std.typeinfo,
 * because then the compiler doesn't need to build one.
 */

int Type::builtinTypeInfo()
{
    return 0;
}

int TypeBasic::builtinTypeInfo()
{
    return 1;
}

int TypeDArray::builtinTypeInfo()
{
    return next->isTypeBasic() != NULL;
}

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

/***************************************
 * Create a static array of TypeInfo references
 * corresponding to an array of Expression's.
 * Used to supply hidden _arguments[] value for variadic D functions.
 */

Expression *createTypeInfoArray(Scope *sc, Expression *args[], int dim)
{
    assert(0);
    return 0;
}

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

//////////////////////////////////////////////////////////////////////////////
//                             MAGIC   PLACE
//////////////////////////////////////////////////////////////////////////////

void TypeInfoDeclaration::toObjFile()
{
    Logger::println("TypeInfoDeclaration::toObjFile()");
    LOG_SCOPE;
    Logger::println("type = '%s'", tinfo->toChars());

    if (llvmTouched) return;
    else llvmTouched = true;

    Logger::println("typeinfo mangle: %s", mangle());

    if (tinfo->builtinTypeInfo()) {
        // this is a declaration of a builtin __initZ var
        llvmValue = LLVM_D_GetRuntimeGlobal(gIR->module, mangle());
        assert(llvmValue);
        Logger::cout() << "Got typeinfo var:" << '\n' << *llvmValue << '\n';
    }
    else {
        toDt(NULL);
        // this is a specialized typeinfo
        //std::vector<const llvm::Type*> stypes;
        //stypes.push_back(
    }
}

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

void TypeInfoDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoDeclaration");
}

void TypeInfoTypedefDeclaration::toDt(dt_t **pdt)
{
    Logger::println("TypeInfoTypedefDeclaration::toDt() %s", toChars());
    LOG_SCOPE;

    ClassDeclaration* base = Type::typeinfotypedef;
    base->toObjFile();

    llvm::Constant* initZ = base->llvmInitZ;
    assert(initZ);
    const llvm::StructType* stype = llvm::cast<llvm::StructType>(initZ->getType());

    std::vector<llvm::Constant*> sinits;
    sinits.push_back(initZ->getOperand(0));

    assert(tinfo->ty == Ttypedef);
    TypeTypedef *tc = (TypeTypedef *)tinfo;
    TypedefDeclaration *sd = tc->sym;

    // TypeInfo base
    //const llvm::PointerType* basept = llvm::cast<llvm::PointerType>(initZ->getOperand(1)->getType());
    //sinits.push_back(llvm::ConstantPointerNull::get(basept));
    Logger::println("generating base typeinfo");
    //sd->basetype = sd->basetype->merge();
    sd->basetype->getTypeInfo(NULL);        // generate vtinfo
    assert(sd->basetype->vtinfo);
    if (!sd->basetype->vtinfo->llvmValue)
        sd->basetype->vtinfo->toObjFile();
    assert(llvm::isa<llvm::Constant>(sd->basetype->vtinfo->llvmValue));
    llvm::Constant* castbase = llvm::cast<llvm::Constant>(sd->basetype->vtinfo->llvmValue);
    castbase = llvm::ConstantExpr::getBitCast(castbase, initZ->getOperand(1)->getType());
    sinits.push_back(castbase);

    // char[] name
    char *name = sd->toPrettyChars();
    sinits.push_back(LLVM_DtoConstString(name));
    assert(sinits.back()->getType() == initZ->getOperand(2)->getType());

    // void[] init
    //const llvm::PointerType* initpt = llvm::PointerType::get(llvm::Type::Int8Ty);
    //sinits.push_back(LLVM_DtoConstantSlice(LLVM_DtoConstSize_t(0), llvm::ConstantPointerNull::get(initpt)));
    sinits.push_back(initZ->getOperand(3));

    // create the symbol
    llvm::Constant* tiInit = llvm::ConstantStruct::get(stype, sinits);
    llvm::GlobalVariable* gvar = new llvm::GlobalVariable(stype,true,llvm::GlobalValue::InternalLinkage,tiInit,toChars(),gIR->module);

    llvmValue = gvar;

    /*
    dtxoff(pdt, Type::typeinfotypedef->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Typedef
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Ttypedef);

    TypeTypedef *tc = (TypeTypedef *)tinfo;
    TypedefDeclaration *sd = tc->sym;
    //printf("basetype = %s\n", sd->basetype->toChars());

    // Put out:
    //  TypeInfo base;
    //  char[] name;
    //  void[] m_init;

    sd->basetype = sd->basetype->merge();
    sd->basetype->getTypeInfo(NULL);        // generate vtinfo
    assert(sd->basetype->vtinfo);
    dtxoff(pdt, sd->basetype->vtinfo->toSymbol(), 0, TYnptr);   // TypeInfo for basetype

    char *name = sd->toPrettyChars();
    size_t namelen = strlen(name);
    dtdword(pdt, namelen);
    dtabytes(pdt, TYnptr, 0, namelen + 1, name);

    // void[] init;
    if (tinfo->isZeroInit() || !sd->init)
    {   // 0 initializer, or the same as the base type
    dtdword(pdt, 0);    // init.length
    dtdword(pdt, 0);    // init.ptr
    }
    else
    {
    dtdword(pdt, sd->type->size()); // init.length
    dtxoff(pdt, sd->toInitializer(), 0, TYnptr);    // init.ptr
    */
}

void TypeInfoEnumDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoEnumDeclaration");
}

void TypeInfoPointerDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoPointerDeclaration");
}

void TypeInfoArrayDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoArrayDeclaration");
}

void TypeInfoStaticArrayDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoStaticArrayDeclaration");
}

void TypeInfoAssociativeArrayDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoAssociativeArrayDeclaration");
}

void TypeInfoFunctionDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoFunctionDeclaration");
}

void TypeInfoDelegateDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoDelegateDeclaration");
}

void TypeInfoStructDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoStructDeclaration");
}

void TypeInfoClassDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoClassDeclaration");
}

void TypeInfoInterfaceDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoInterfaceDeclaration");
}

void TypeInfoTupleDeclaration::toDt(dt_t **pdt)
{
    assert(0 && "TypeInfoTupleDeclaration");
}

// original dmdfe toDt code for reference

#if 0

void TypeInfoDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoDeclaration::toDt() %s\n", toChars());
    dtxoff(pdt, Type::typeinfo->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo
    dtdword(pdt, 0);                // monitor
}

void TypeInfoTypedefDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoTypedefDeclaration::toDt() %s\n", toChars());

    dtxoff(pdt, Type::typeinfotypedef->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Typedef
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Ttypedef);

    TypeTypedef *tc = (TypeTypedef *)tinfo;
    TypedefDeclaration *sd = tc->sym;
    //printf("basetype = %s\n", sd->basetype->toChars());

    /* Put out:
     *  TypeInfo base;
     *  char[] name;
     *  void[] m_init;
     */

    sd->basetype = sd->basetype->merge();
    sd->basetype->getTypeInfo(NULL);        // generate vtinfo
    assert(sd->basetype->vtinfo);
    dtxoff(pdt, sd->basetype->vtinfo->toSymbol(), 0, TYnptr);   // TypeInfo for basetype

    char *name = sd->toPrettyChars();
    size_t namelen = strlen(name);
    dtdword(pdt, namelen);
    dtabytes(pdt, TYnptr, 0, namelen + 1, name);

    // void[] init;
    if (tinfo->isZeroInit() || !sd->init)
    {   // 0 initializer, or the same as the base type
    dtdword(pdt, 0);    // init.length
    dtdword(pdt, 0);    // init.ptr
    }
    else
    {
    dtdword(pdt, sd->type->size()); // init.length
    dtxoff(pdt, sd->toInitializer(), 0, TYnptr);    // init.ptr
    }
}

void TypeInfoEnumDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoEnumDeclaration::toDt()\n");
    dtxoff(pdt, Type::typeinfoenum->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Enum
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tenum);

    TypeEnum *tc = (TypeEnum *)tinfo;
    EnumDeclaration *sd = tc->sym;

    /* Put out:
     *  TypeInfo base;
     *  char[] name;
     *  void[] m_init;
     */

    sd->memtype->getTypeInfo(NULL);
    dtxoff(pdt, sd->memtype->vtinfo->toSymbol(), 0, TYnptr);    // TypeInfo for enum members

    char *name = sd->toPrettyChars();
    size_t namelen = strlen(name);
    dtdword(pdt, namelen);
    dtabytes(pdt, TYnptr, 0, namelen + 1, name);

    // void[] init;
    if (tinfo->isZeroInit() || !sd->defaultval)
    {   // 0 initializer, or the same as the base type
    dtdword(pdt, 0);    // init.length
    dtdword(pdt, 0);    // init.ptr
    }
    else
    {
    dtdword(pdt, sd->type->size()); // init.length
    dtxoff(pdt, sd->toInitializer(), 0, TYnptr);    // init.ptr
    }
}

void TypeInfoPointerDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoPointerDeclaration::toDt()\n");
    dtxoff(pdt, Type::typeinfopointer->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Pointer
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tpointer);

    TypePointer *tc = (TypePointer *)tinfo;

    tc->next->getTypeInfo(NULL);
    dtxoff(pdt, tc->next->vtinfo->toSymbol(), 0, TYnptr); // TypeInfo for type being pointed to
}

void TypeInfoArrayDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoArrayDeclaration::toDt()\n");
    dtxoff(pdt, Type::typeinfoarray->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Array
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tarray);

    TypeDArray *tc = (TypeDArray *)tinfo;

    tc->next->getTypeInfo(NULL);
    dtxoff(pdt, tc->next->vtinfo->toSymbol(), 0, TYnptr); // TypeInfo for array of type
}

void TypeInfoStaticArrayDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoStaticArrayDeclaration::toDt()\n");
    dtxoff(pdt, Type::typeinfostaticarray->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_StaticArray
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tsarray);

    TypeSArray *tc = (TypeSArray *)tinfo;

    tc->next->getTypeInfo(NULL);
    dtxoff(pdt, tc->next->vtinfo->toSymbol(), 0, TYnptr); // TypeInfo for array of type

    dtdword(pdt, tc->dim->toInteger());     // length
}

void TypeInfoAssociativeArrayDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoAssociativeArrayDeclaration::toDt()\n");
    dtxoff(pdt, Type::typeinfoassociativearray->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_AssociativeArray
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Taarray);

    TypeAArray *tc = (TypeAArray *)tinfo;

    tc->next->getTypeInfo(NULL);
    dtxoff(pdt, tc->next->vtinfo->toSymbol(), 0, TYnptr); // TypeInfo for array of type

    tc->index->getTypeInfo(NULL);
    dtxoff(pdt, tc->index->vtinfo->toSymbol(), 0, TYnptr); // TypeInfo for array of type
}

void TypeInfoFunctionDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoFunctionDeclaration::toDt()\n");
    dtxoff(pdt, Type::typeinfofunction->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Function
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tfunction);

    TypeFunction *tc = (TypeFunction *)tinfo;

    tc->next->getTypeInfo(NULL);
    dtxoff(pdt, tc->next->vtinfo->toSymbol(), 0, TYnptr); // TypeInfo for function return value
}

void TypeInfoDelegateDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoDelegateDeclaration::toDt()\n");
    dtxoff(pdt, Type::typeinfodelegate->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Delegate
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tdelegate);

    TypeDelegate *tc = (TypeDelegate *)tinfo;

    tc->next->next->getTypeInfo(NULL);
    dtxoff(pdt, tc->next->next->vtinfo->toSymbol(), 0, TYnptr); // TypeInfo for delegate return value
}

void TypeInfoStructDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoStructDeclaration::toDt() '%s'\n", toChars());

    unsigned offset = Type::typeinfostruct->structsize;

    dtxoff(pdt, Type::typeinfostruct->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfo_Struct
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tstruct);

    TypeStruct *tc = (TypeStruct *)tinfo;
    StructDeclaration *sd = tc->sym;

    /* Put out:
     *  char[] name;
     *  void[] init;
     *  hash_t function(void*) xtoHash;
     *  int function(void*,void*) xopEquals;
     *  int function(void*,void*) xopCmp;
     *  char[] function(void*) xtoString;
     *  uint m_flags;
     *
     *  name[]
     */

    char *name = sd->toPrettyChars();
    size_t namelen = strlen(name);
    dtdword(pdt, namelen);
    //dtabytes(pdt, TYnptr, 0, namelen + 1, name);
    dtxoff(pdt, toSymbol(), offset, TYnptr);
    offset += namelen + 1;

    // void[] init;
    dtdword(pdt, sd->structsize);   // init.length
    if (sd->zeroInit)
    dtdword(pdt, 0);        // NULL for 0 initialization
    else
    dtxoff(pdt, sd->toInitializer(), 0, TYnptr);    // init.ptr

    FuncDeclaration *fd;
    FuncDeclaration *fdx;
    TypeFunction *tf;
    Type *ta;
    Dsymbol *s;

    static TypeFunction *tftohash;
    static TypeFunction *tftostring;

    if (!tftohash)
    {
    Scope sc;

    tftohash = new TypeFunction(NULL, Type::thash_t, 0, LINKd);
    tftohash = (TypeFunction *)tftohash->semantic(0, &sc);

    tftostring = new TypeFunction(NULL, Type::tchar->arrayOf(), 0, LINKd);
    tftostring = (TypeFunction *)tftostring->semantic(0, &sc);
    }

    TypeFunction *tfeqptr;
    {
    Scope sc;
    Arguments *arguments = new Arguments;
    Argument *arg = new Argument(STCin, tc->pointerTo(), NULL, NULL);

    arguments->push(arg);
    tfeqptr = new TypeFunction(arguments, Type::tint32, 0, LINKd);
    tfeqptr = (TypeFunction *)tfeqptr->semantic(0, &sc);
    }

#if 0
    TypeFunction *tfeq;
    {
    Scope sc;
    Array *arguments = new Array;
    Argument *arg = new Argument(In, tc, NULL, NULL);

    arguments->push(arg);
    tfeq = new TypeFunction(arguments, Type::tint32, 0, LINKd);
    tfeq = (TypeFunction *)tfeq->semantic(0, &sc);
    }
#endif

    s = search_function(sd, Id::tohash);
    fdx = s ? s->isFuncDeclaration() : NULL;
    if (fdx)
    {   fd = fdx->overloadExactMatch(tftohash);
    if (fd)
        dtxoff(pdt, fd->toSymbol(), 0, TYnptr);
    else
        //fdx->error("must be declared as extern (D) uint toHash()");
        dtdword(pdt, 0);
    }
    else
    dtdword(pdt, 0);

    s = search_function(sd, Id::eq);
    fdx = s ? s->isFuncDeclaration() : NULL;
    for (int i = 0; i < 2; i++)
    {
    if (fdx)
    {   fd = fdx->overloadExactMatch(tfeqptr);
        if (fd)
        dtxoff(pdt, fd->toSymbol(), 0, TYnptr);
        else
        //fdx->error("must be declared as extern (D) int %s(%s*)", fdx->toChars(), sd->toChars());
        dtdword(pdt, 0);
    }
    else
        dtdword(pdt, 0);

    s = search_function(sd, Id::cmp);
    fdx = s ? s->isFuncDeclaration() : NULL;
    }

    s = search_function(sd, Id::tostring);
    fdx = s ? s->isFuncDeclaration() : NULL;
    if (fdx)
    {   fd = fdx->overloadExactMatch(tftostring);
    if (fd)
        dtxoff(pdt, fd->toSymbol(), 0, TYnptr);
    else
        //fdx->error("must be declared as extern (D) char[] toString()");
        dtdword(pdt, 0);
    }
    else
    dtdword(pdt, 0);

    // uint m_flags;
    dtdword(pdt, tc->hasPointers());

    // name[]
    dtnbytes(pdt, namelen + 1, name);
}

void TypeInfoClassDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoClassDeclaration::toDt() %s\n", tinfo->toChars());
    dtxoff(pdt, Type::typeinfoclass->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfoClass
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tclass);

    TypeClass *tc = (TypeClass *)tinfo;
    Symbol *s;

    if (!tc->sym->vclassinfo)
    tc->sym->vclassinfo = new ClassInfoDeclaration(tc->sym);
    s = tc->sym->vclassinfo->toSymbol();
    dtxoff(pdt, s, 0, TYnptr);      // ClassInfo for tinfo
}

void TypeInfoInterfaceDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoInterfaceDeclaration::toDt() %s\n", tinfo->toChars());
    dtxoff(pdt, Type::typeinfointerface->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfoInterface
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Tclass);

    TypeClass *tc = (TypeClass *)tinfo;
    Symbol *s;

    if (!tc->sym->vclassinfo)
    tc->sym->vclassinfo = new ClassInfoDeclaration(tc->sym);
    s = tc->sym->vclassinfo->toSymbol();
    dtxoff(pdt, s, 0, TYnptr);      // ClassInfo for tinfo
}

void TypeInfoTupleDeclaration::toDt(dt_t **pdt)
{
    //printf("TypeInfoTupleDeclaration::toDt() %s\n", tinfo->toChars());
    dtxoff(pdt, Type::typeinfotypelist->toVtblSymbol(), 0, TYnptr); // vtbl for TypeInfoInterface
    dtdword(pdt, 0);                // monitor

    assert(tinfo->ty == Ttuple);

    TypeTuple *tu = (TypeTuple *)tinfo;

    size_t dim = tu->arguments->dim;
    dtdword(pdt, dim);              // elements.length

    dt_t *d = NULL;
    for (size_t i = 0; i < dim; i++)
    {   Argument *arg = (Argument *)tu->arguments->data[i];
    Expression *e = arg->type->getTypeInfo(NULL);
    e = e->optimize(WANTvalue);
    e->toDt(&d);
    }

    Symbol *s;
    s = static_sym();
    s->Sdt = d;
    outdata(s);

    dtxoff(pdt, s, 0, TYnptr);          // elements.ptr
}

void TypeInfoDeclaration::toObjFile()
{
    Symbol *s;
    unsigned sz;
    Dsymbol *parent;

    //printf("TypeInfoDeclaration::toObjFile(%p '%s') protection %d\n", this, toChars(), protection);

    s = toSymbol();
    sz = type->size();

    parent = this->toParent();
    s->Sclass = SCcomdat;
    s->Sfl = FLdata;

    toDt(&s->Sdt);

    dt_optimize(s->Sdt);

    // See if we can convert a comdat to a comdef,
    // which saves on exe file space.
    if (s->Sclass == SCcomdat &&
    s->Sdt->dt == DT_azeros &&
    s->Sdt->DTnext == NULL)
    {
    s->Sclass = SCglobal;
    s->Sdt->dt = DT_common;
    }

#if ELFOBJ // Burton
    if (s->Sdt && s->Sdt->dt == DT_azeros && s->Sdt->DTnext == NULL)
    s->Sseg = UDATA;
    else
    s->Sseg = DATA;
#endif /* ELFOBJ */
    outdata(s);
    if (isExport())
    obj_export(s,0);
}

#endif