C++ Dsymbol::toPrettyChars方法代码示例

/******************************************
 * Common code for overloading of EqualExp and CmpExp
 */
Expression *BinExp::compare_overload(Scope *sc, Identifier *id)
{
    //printf("BinExp::compare_overload(id = %s) %s\n", id->toChars(), toChars());

    AggregateDeclaration *ad1 = isAggregate(e1->type);
    AggregateDeclaration *ad2 = isAggregate(e2->type);

    Dsymbol *s = NULL;
    Dsymbol *s_r = NULL;

    if (ad1)
    {
        s = search_function(ad1, id);
    }
    if (ad2)
    {
        s_r = search_function(ad2, id);
        if (s == s_r)
            s_r = NULL;
    }

    Objects *targsi = NULL;

    if (s || s_r)
    {
        /* Try:
         *      a.opEquals(b)
         *      b.opEquals(a)
         * and see which is better.
         */

        Expressions args1;
        Expressions args2;

        args1.setDim(1);
        args1.tdata()[0] = e1;
        args2.setDim(1);
        args2.tdata()[0] = e2;

        Match m;
        memset(&m, 0, sizeof(m));
        m.last = MATCHnomatch;

        if (0 && s && s_r)
        {
            printf("s  : %s\n", s->toPrettyChars());
            printf("s_r: %s\n", s_r->toPrettyChars());
        }

        if (s)
        {
            FuncDeclaration *fd = s->isFuncDeclaration();
            if (fd)
            {
                overloadResolveX(&m, fd, NULL, &args2, sc->module);
            }
            else
            {   TemplateDeclaration *td = s->isTemplateDeclaration();
                templateResolve(&m, td, sc, loc, targsi, NULL, &args2);
            }
        }

        FuncDeclaration *lastf = m.lastf;
        int count = m.count;

        if (s_r)
        {
            FuncDeclaration *fd = s_r->isFuncDeclaration();
            if (fd)
            {
                overloadResolveX(&m, fd, NULL, &args1, sc->module);
            }
            else
            {   TemplateDeclaration *td = s_r->isTemplateDeclaration();
                templateResolve(&m, td, sc, loc, targsi, NULL, &args1);
            }
        }

        if (m.count > 1)
        {
            /* The following if says "not ambiguous" if there's one match
             * from s and one from s_r, in which case we pick s.
             * This doesn't follow the spec, but is a workaround for the case
             * where opEquals was generated from templates and we cannot figure
             * out if both s and s_r came from the same declaration or not.
             * The test case is:
             *   import std.typecons;
             *   void main() {
             *    assert(tuple("has a", 2u) == tuple("has a", 1));
             *   }
             */
            if (!(m.lastf == lastf && m.count == 2 && count == 1))
            {
                // Error, ambiguous
                error("overloads %s and %s both match argument list for %s",
                    m.lastf->type->toChars(),
                    m.nextf->type->toChars(),
//.........这里部分代码省略.........

DValue *DtoNestedVariable(Loc &loc, Type *astype, VarDeclaration *vd,
                          bool byref) {
  IF_LOG Logger::println("DtoNestedVariable for %s @ %s", vd->toChars(),
                         loc.toChars());
  LOG_SCOPE;

  ////////////////////////////////////
  // Locate context value

  Dsymbol *vdparent = vd->toParent2();
  assert(vdparent);

  IrFunction *irfunc = gIR->func();

  // Check whether we can access the needed frame
  FuncDeclaration *fd = irfunc->decl;
  while (fd && fd != vdparent) {
    fd = getParentFunc(fd);
  }
  if (!fd) {
    error(loc, "function `%s` cannot access frame of function `%s`",
          irfunc->decl->toPrettyChars(), vdparent->toPrettyChars());
    return new DLValue(astype, llvm::UndefValue::get(DtoPtrToType(astype)));
  }

  // is the nested variable in this scope?
  if (vdparent == irfunc->decl) {
    return makeVarDValue(astype, vd);
  }

  // get the nested context
  LLValue *ctx = nullptr;
  bool skipDIDeclaration = false;
  auto currentCtx = gIR->funcGen().nestedVar;
  if (currentCtx) {
    Logger::println("Using own nested context of current function");
    ctx = currentCtx;
  } else if (irfunc->decl->isMember2()) {
    Logger::println(
        "Current function is member of nested class, loading vthis");

    AggregateDeclaration *cd = irfunc->decl->isMember2();
    LLValue *val = irfunc->thisArg;
    if (cd->isClassDeclaration()) {
      val = DtoLoad(val);
    }
    ctx = DtoLoad(DtoGEPi(val, 0, getVthisIdx(cd), ".vthis"));
    skipDIDeclaration = true;
  } else {
    Logger::println("Regular nested function, loading context arg");

    ctx = DtoLoad(irfunc->nestArg);
  }

  assert(ctx);
  IF_LOG { Logger::cout() << "Context: " << *ctx << '\n'; }

  DtoCreateNestedContextType(vdparent->isFuncDeclaration());
  assert(isIrLocalCreated(vd));

  ////////////////////////////////////
  // Extract variable from nested context

  const auto frameType = LLPointerType::getUnqual(irfunc->frameType);
  IF_LOG { Logger::cout() << "casting to: " << *irfunc->frameType << '\n'; }
  LLValue *val = DtoBitCast(ctx, frameType);

  IrLocal *const irLocal = getIrLocal(vd);
  const auto vardepth = irLocal->nestedDepth;
  const auto funcdepth = irfunc->depth;

  IF_LOG {
    Logger::cout() << "Variable: " << vd->toChars() << '\n';
    Logger::cout() << "Variable depth: " << vardepth << '\n';
    Logger::cout() << "Function: " << irfunc->decl->toChars() << '\n';
    Logger::cout() << "Function depth: " << funcdepth << '\n';
  }

  if (vardepth == funcdepth) {
    // This is not always handled above because functions without
    // variables accessed by nested functions don't create new frames.
    IF_LOG Logger::println("Same depth");
  } else {
    // Load frame pointer and index that...
    IF_LOG Logger::println("Lower depth");
    val = DtoGEPi(val, 0, vardepth);
    IF_LOG Logger::cout() << "Frame index: " << *val << '\n';
    val = DtoAlignedLoad(
        val, (std::string(".frame.") + vdparent->toChars()).c_str());
    IF_LOG Logger::cout() << "Frame: " << *val << '\n';
  }

  const auto idx = irLocal->nestedIndex;
  assert(idx != -1 && "Nested context not yet resolved for variable.");

  LLSmallVector<int64_t, 2> dwarfAddrOps;

  LLValue *gep = DtoGEPi(val, 0, idx, vd->toChars());
  val = gep;
  IF_LOG {
//.........这里部分代码省略.........

//.........这里部分代码省略.........

            Dsymbol *ss = (*imports)[i];

            //printf("\tscanning import '%s', prots = %d, isModule = %p, isImport = %p\n", ss->toChars(), prots[i], ss->isModule(), ss->isImport());
            /* Don't find private members if ss is a module
             */
            Dsymbol *s2 = ss->search(loc, ident, ss->isModule() ? 1 : 0);
            if (!s)
                s = s2;
            else if (s2 && s != s2)
            {
                if (s->toAlias() == s2->toAlias() ||
                    s->getType() == s2->getType() && s->getType())
                {
                    /* After following aliases, we found the same
                     * symbol, so it's not an ambiguity.  But if one
                     * alias is deprecated or less accessible, prefer
                     * the other.
                     */
                    if (s->isDeprecated() ||
                        s2->prot() > s->prot() && s2->prot() != PROTnone)
                        s = s2;
                }
                else
                {
                    /* Two imports of the same module should be regarded as
                     * the same.
                     */
                    Import *i1 = s->isImport();
                    Import *i2 = s2->isImport();
                    if (!(i1 && i2 &&
                          (i1->mod == i2->mod ||
                           (!i1->parent->isImport() && !i2->parent->isImport() &&
                            i1->ident->equals(i2->ident))
                          )
                         )
                       )
                    {
                        /* Bugzilla 8668:
                         * Public selective import adds AliasDeclaration in module.
                         * To make an overload set, resolve aliases in here and
                         * get actual overload roots which accessible via s and s2.
                         */
                        s = s->toAlias();
                        s2 = s2->toAlias();

                        /* If both s2 and s are overloadable (though we only
                         * need to check s once)
                         */
                        if (s2->isOverloadable() && (a || s->isOverloadable()))
                        {   if (!a)
                            {
                                a = new OverloadSet(s->ident);
                                a->parent = this;
                            }
                            /* Don't add to a[] if s2 is alias of previous sym
                             */
                            for (size_t j = 0; j < a->a.dim; j++)
                            {   Dsymbol *s3 = a->a[j];
                                if (s2->toAlias() == s3->toAlias())
                                {
                                    if (s3->isDeprecated() ||
                                        s2->prot() > s3->prot() && s2->prot() != PROTnone)
                                        a->a[j] = s2;
                                    goto Lcontinue;
                                }
                            }
                            a->push(s2);
                        Lcontinue:
                            continue;
                        }
                        if (flags & 4)          // if return NULL on ambiguity
                            return NULL;
                        if (!(flags & 2))
                            ScopeDsymbol::multiplyDefined(loc, s, s2);
                        break;
                    }
                }
            }
        }

        /* Build special symbol if we had multiple finds
         */
        if (a)
        {   assert(s);
            a->push(s);
            s = a;
        }

        if (s)
        {
            if (!(flags & 2) && s->prot() == PROTprivate && !s->parent->isTemplateMixin())
            {
                if (!s->isImport())
                    error(loc, "%s %s is private", s->kind(), s->toPrettyChars());
            }
        }
        return s;
    }
}

DValue* DtoNestedVariable(Loc& loc, Type* astype, VarDeclaration* vd, bool byref)
{
    IF_LOG Logger::println("DtoNestedVariable for %s @ %s", vd->toChars(), loc.toChars());
    LOG_SCOPE;

    ////////////////////////////////////
    // Locate context value

    Dsymbol* vdparent = vd->toParent2();
    assert(vdparent);

    IrFunction* irfunc = gIR->func();

    // Check whether we can access the needed frame
    FuncDeclaration *fd = irfunc->decl;
    while (fd != vdparent) {
        if (fd->isStatic()) {
            error(loc, "function %s cannot access frame of function %s", irfunc->decl->toPrettyChars(), vdparent->toPrettyChars());
            return new DVarValue(astype, vd, llvm::UndefValue::get(getPtrToType(DtoType(astype))));
        }
        fd = getParentFunc(fd, false);
        assert(fd);
    }

    // is the nested variable in this scope?
    if (vdparent == irfunc->decl)
    {
        LLValue* val = vd->ir.getIrValue();
        return new DVarValue(astype, vd, val);
    }

    LLValue *dwarfValue = 0;
    std::vector<LLValue*> dwarfAddr;

    // get the nested context
    LLValue* ctx = 0;
    if (irfunc->nestedVar) {
        // If this function has its own nested context struct, always load it.
        ctx = irfunc->nestedVar;
        dwarfValue = ctx;
    } else if (irfunc->decl->isMember2()) {
        // If this is a member function of a nested class without its own
        // context, load the vthis member.
        AggregateDeclaration* cd = irfunc->decl->isMember2();
        LLValue* val = irfunc->thisArg;
        if (cd->isClassDeclaration())
            val = DtoLoad(val);
        ctx = DtoLoad(DtoGEPi(val, 0, cd->vthis->ir.irField->index, ".vthis"));
    } else {
        // Otherwise, this is a simple nested function, load from the context
        // argument.
        ctx = DtoLoad(irfunc->nestArg);
        dwarfValue = irfunc->nestArg;
        if (global.params.symdebug)
            gIR->DBuilder.OpDeref(dwarfAddr);
    }
    assert(ctx);

    DtoCreateNestedContextType(vdparent->isFuncDeclaration());
    assert(vd->ir.irLocal);

    ////////////////////////////////////
    // Extract variable from nested context

    LLValue* val = DtoBitCast(ctx, LLPointerType::getUnqual(irfunc->frameType));
    IF_LOG {
        Logger::cout() << "Context: " << *val << '\n';
        Logger::cout() << "of type: " << *irfunc->frameType << '\n';
    }

    unsigned vardepth = vd->ir.irLocal->nestedDepth;
    unsigned funcdepth = irfunc->depth;

    IF_LOG {
        Logger::cout() << "Variable: " << vd->toChars() << '\n';
        Logger::cout() << "Variable depth: " << vardepth << '\n';
        Logger::cout() << "Function: " << irfunc->decl->toChars() << '\n';
        Logger::cout() << "Function depth: " << funcdepth << '\n';
    }

    if (vardepth == funcdepth) {
        // This is not always handled above because functions without
        // variables accessed by nested functions don't create new frames.
        IF_LOG Logger::println("Same depth");
    } else {
        // Load frame pointer and index that...
        if (dwarfValue && global.params.symdebug) {
            gIR->DBuilder.OpOffset(dwarfAddr, val, vd->ir.irLocal->nestedDepth);
            gIR->DBuilder.OpDeref(dwarfAddr);
        }
        IF_LOG Logger::println("Lower depth");
        val = DtoGEPi(val, 0, vd->ir.irLocal->nestedDepth);
        IF_LOG Logger::cout() << "Frame index: " << *val << '\n';
        val = DtoAlignedLoad(val, (std::string(".frame.") + vdparent->toChars()).c_str());
        IF_LOG Logger::cout() << "Frame: " << *val << '\n';
    }

    int idx = vd->ir.irLocal->nestedIndex;
    assert(idx != -1 && "Nested context not yet resolved for variable.");

//.........这里部分代码省略.........

/************************************
 * Perform unqualified name lookup by following the chain of scopes up
 * until found.
 *
 * Params:
 *  loc = location to use for error messages
 *  ident = name to look up
 *  pscopesym = if supplied and name is found, set to scope that ident was found in
 *  flags = modify search based on flags
 *
 * Returns:
 *  symbol if found, null if not
 */
Dsymbol *Scope::search(Loc loc, Identifier *ident, Dsymbol **pscopesym, int flags)
{
    // This function is called only for unqualified lookup
    assert(!(flags & (SearchLocalsOnly | SearchImportsOnly)));

    /* If ident is "start at module scope", only look at module scope
     */
    if (ident == Id::empty)
    {
        // Look for module scope
        for (Scope *sc = this; sc; sc = sc->enclosing)
        {
            assert(sc != sc->enclosing);
            if (!sc->scopesym)
                continue;

            if (Dsymbol *s = sc->scopesym->isModule())
            {
                if (pscopesym)
                    *pscopesym = sc->scopesym;
                return s;
            }
        }
        return NULL;
    }

    if (this->flags & SCOPEignoresymbolvisibility)
        flags |= IgnoreSymbolVisibility;

    Dsymbol *sold = NULL;
    if (global.params.bug10378 || global.params.check10378)
    {
        sold = searchScopes(this, loc, ident, pscopesym, flags | IgnoreSymbolVisibility);
        if (!global.params.check10378)
            return sold;

        if (ident == Id::dollar) // Bugzilla 15825
            return sold;

        // Search both ways
    }

    // First look in local scopes
    Dsymbol *s = searchScopes(this, loc, ident, pscopesym, flags | SearchLocalsOnly);
    if (!s)
    {
        // Second look in imported modules
        s = searchScopes(this, loc, ident, pscopesym, flags | SearchImportsOnly);
        /** Still find private symbols, so that symbols that weren't access
         * checked by the compiler remain usable.  Once the deprecation is over,
         * this should be moved to search_correct instead.
         */
        if (!s && !(flags & IgnoreSymbolVisibility))
        {
            s = searchScopes(this, loc, ident, pscopesym, flags | SearchLocalsOnly | IgnoreSymbolVisibility);
            if (!s)
                s = searchScopes(this, loc, ident, pscopesym, flags | SearchImportsOnly | IgnoreSymbolVisibility);

            if (s && !(flags & IgnoreErrors))
                ::deprecation(loc, "%s is not visible from module %s", s->toPrettyChars(), _module->toChars());
        }
    }

    if (global.params.check10378)
    {
        Dsymbol *snew = s;
        if (sold != snew)
            deprecation10378(loc, sold, snew);
        if (global.params.bug10378)
            s = sold;
    }
    return s;
}

void Import::load(Scope *sc)
{
    //printf("Import::load('%s') %p\n", toPrettyChars(), this);

    // See if existing module
    DsymbolTable *dst = Package::resolve(packages, NULL, &pkg);
#if 0
    if (pkg && pkg->isModule())
    {
        ::error(loc, "can only import from a module, not from a member of module %s. Did you mean `import %s : %s`?",
             pkg->toChars(), pkg->toPrettyChars(), id->toChars());
        mod = pkg->isModule(); // Error recovery - treat as import of that module
        return;
    }
#endif
    Dsymbol *s = dst->lookup(id);
    if (s)
    {
        if (s->isModule())
            mod = (Module *)s;
        else
        {
            if (s->isAliasDeclaration())
            {
                ::error(loc, "%s %s conflicts with %s", s->kind(), s->toPrettyChars(), id->toChars());
            }
            else if (Package *p = s->isPackage())
            {
                if (p->isPkgMod == PKGunknown)
                {
                    mod = Module::load(loc, packages, id);
                    if (!mod)
                        p->isPkgMod = PKGpackage;
                    else
                        assert(p->isPkgMod == PKGmodule);
                }
                else
                {
                    mod = p->isPackageMod();
                }
                if (!mod)
                {
                    ::error(loc, "can only import from a module, not from package %s.%s",
                        p->toPrettyChars(), id->toChars());
                }
            }
            else if (pkg)
            {
                ::error(loc, "can only import from a module, not from package %s.%s",
                    pkg->toPrettyChars(), id->toChars());
            }
            else
            {
                ::error(loc, "can only import from a module, not from package %s",
                    id->toChars());
            }
        }
    }

    if (!mod)
    {
        // Load module
        mod = Module::load(loc, packages, id);
        if (mod)
        {
            dst->insert(id, mod);           // id may be different from mod->ident,
                                            // if so then insert alias
        }
    }
    if (mod && !mod->importedFrom)
        mod->importedFrom = sc ? sc->module->importedFrom : Module::rootModule;
    if (!pkg)
        pkg = mod;

    //printf("-Import::load('%s'), pkg = %p\n", toChars(), pkg);
}

DValue* DtoNestedVariable(Loc loc, Type* astype, VarDeclaration* vd, bool byref)
{
    Logger::println("DtoNestedVariable for %s @ %s", vd->toChars(), loc.toChars());
    LOG_SCOPE;

    ////////////////////////////////////
    // Locate context value

    Dsymbol* vdparent = vd->toParent2();
    assert(vdparent);

    IrFunction* irfunc = gIR->func();

    // Check whether we can access the needed frame
    FuncDeclaration *fd = irfunc->decl;
    while (fd != vdparent) {
        if (fd->isStatic()) {
            error(loc, "function %s cannot access frame of function %s", irfunc->decl->toPrettyChars(), vdparent->toPrettyChars());
            return new DVarValue(astype, vd, llvm::UndefValue::get(getPtrToType(DtoType(astype))));
        }
        fd = getParentFunc(fd, false);
        assert(fd);
    }

    // is the nested variable in this scope?
    if (vdparent == irfunc->decl)
    {
        LLValue* val = vd->ir.getIrValue();
        return new DVarValue(astype, vd, val);
    }

    LLValue *dwarfValue = 0;
    std::vector<LLValue*> dwarfAddr;
    LLType *int64Ty = LLType::getInt64Ty(gIR->context());

    // get the nested context
    LLValue* ctx = 0;
    if (irfunc->decl->isMember2())
    {
    #if DMDV2
        AggregateDeclaration* cd = irfunc->decl->isMember2();
        LLValue* val = irfunc->thisArg;
        if (cd->isClassDeclaration())
            val = DtoLoad(val);
    #else
        ClassDeclaration* cd = irfunc->decl->isMember2()->isClassDeclaration();
        LLValue* val = DtoLoad(irfunc->thisArg);
    #endif
        ctx = DtoLoad(DtoGEPi(val, 0,cd->vthis->ir.irField->index, ".vthis"));
    }
    else if (irfunc->nestedVar) {
        ctx = irfunc->nestedVar;
        dwarfValue = ctx;
    } else {
        ctx = DtoLoad(irfunc->nestArg);
        dwarfValue = irfunc->nestArg;
        if (global.params.symdebug)
            dwarfOpDeref(dwarfAddr);
    }
    assert(ctx);

    DtoCreateNestedContextType(vdparent->isFuncDeclaration());
    assert(vd->ir.irLocal);

    ////////////////////////////////////
    // Extract variable from nested context

    if (nestedCtx == NCArray) {
        LLValue* val = DtoBitCast(ctx, getPtrToType(getVoidPtrType()));
        val = DtoGEPi1(val, vd->ir.irLocal->nestedIndex);
        val = DtoAlignedLoad(val);
        assert(vd->ir.irLocal->value);
        val = DtoBitCast(val, vd->ir.irLocal->value->getType(), vd->toChars());
        return new DVarValue(astype, vd, val);
    }
    else if (nestedCtx == NCHybrid) {
        LLValue* val = DtoBitCast(ctx, LLPointerType::getUnqual(irfunc->frameType));
        Logger::cout() << "Context: " << *val << '\n';
        Logger::cout() << "of type: " << *val->getType() << '\n';

        unsigned vardepth = vd->ir.irLocal->nestedDepth;
        unsigned funcdepth = irfunc->depth;

        Logger::cout() << "Variable: " << vd->toChars() << '\n';
        Logger::cout() << "Variable depth: " << vardepth << '\n';
        Logger::cout() << "Function: " << irfunc->decl->toChars() << '\n';
        Logger::cout() << "Function depth: " << funcdepth << '\n';

        if (vardepth == funcdepth) {
            // This is not always handled above because functions without
            // variables accessed by nested functions don't create new frames.
            Logger::println("Same depth");
        } else {
            // Load frame pointer and index that...
            if (dwarfValue && global.params.symdebug) {
                dwarfOpOffset(dwarfAddr, val, vd->ir.irLocal->nestedDepth);
                dwarfOpDeref(dwarfAddr);
            }
            Logger::println("Lower depth");
            val = DtoGEPi(val, 0, vd->ir.irLocal->nestedDepth);
//.........这里部分代码省略.........