C++ Loc函数代码示例

/// Sanitizes the MIPS ABI in the feature string.
static void addMipsABI(const llvm::Triple &triple, std::vector<std::string> &attrs)
{
    enum ABI { O32 = 1<<0, N32 = 1<<1, N64 = 1<<2, EABI = 1<<3 };
    const bool is64Bit = triple.getArch() == llvm::Triple::mips64 ||
                         triple.getArch() == llvm::Triple::mips64el;
    const uint32_t defaultABI = is64Bit ? N64 : O32;
    uint32_t bits = defaultABI;
    std::vector<std::string>::iterator I = attrs.begin();
    while (I != attrs.end())
    {
        std::string str = *I;
        bool enabled = str[0] == '+';
        std::string flag = (str[0] == '+' || str[0] == '-') ? str.substr(1) : str;
        uint32_t newBit = 0;
        if (flag == "o32") newBit = O32;
        if (flag == "n32") newBit = N32;
        if (flag == "n64") newBit = N64;
        if (flag == "eabi") newBit = EABI;
        if (newBit)
        {
            I = attrs.erase(I);
            if (enabled) bits |= newBit;
            else bits &= ~newBit;
        }
        else
            ++I;
    }
    switch (bits)
    {
        case O32: attrs.push_back("+o32"); break;
        case N32: attrs.push_back("+n32"); break;
        case N64: attrs.push_back("+n64"); break;
        case EABI: attrs.push_back("+eabi"); break;
        default: error(Loc(), "Only one ABI argument is supported"); fatal();
    }
    if (bits != defaultABI)
        attrs.push_back(is64Bit ? "-n64" : "-o32");
}

void AggregateDeclaration::generateTypeInfoData(Scope *sc)
{
    if (!getRTInfo && Type::rtinfo &&
        (!isDeprecated() || global.params.useDeprecated) && // don't do it for unused deprecated types
        (type && type->ty != Terror)) // or error types
    {   // Evaluate: gcinfo!type
        Objects *tiargs = new Objects();
        tiargs->push(type);
        TemplateInstance *ti = new TemplateInstance(loc, Type::rtinfo, tiargs);
        ti->semantic(sc);
        ti->semantic2(sc);
        ti->semantic3(sc);
        Dsymbol *s = ti->toAlias();
        Expression *e = new DsymbolExp(Loc(), s, 0);

        Scope *sc2 = ti->tempdecl->scope->startCTFE();
        sc2->instantiatingModule = sc->instantiatingModule ? sc->instantiatingModule : sc->module;
        e = e->semantic(sc2);
        sc2->endCTFE();
        e = e->ctfeInterpret();
        getRTInfo = e;
    }
}

bool UWorld::IsTraceHandleValid(const FTraceHandle& Handle, bool bOverlapTrace)
{
	// only valid if it's previous frame or current frame
	if (Handle._Data.FrameNumber != AsyncTraceState.CurrentFrame - 1 && Handle._Data.FrameNumber != AsyncTraceState.CurrentFrame)
	{
		return false;
	}

	// make sure it has valid index
	AsyncTraceData& DataBuffer = AsyncTraceState.GetBufferForFrame(Handle._Data.FrameNumber);

	// this function basically verifies if the address location 
	// is VALID, not necessarily that location was USED in that frame
	FBufferIndexPair Loc(Handle._Data.Index);
	if (bOverlapTrace)
	{
		return !!Loc.DatumLookup(DataBuffer.OverlapData);
	}
	else
	{
		return !!Loc.DatumLookup(DataBuffer.TraceData);
	}
}

Dsymbol *search_function(ScopeDsymbol *ad, Identifier *funcid)
{
    Dsymbol *s;
    FuncDeclaration *fd;
    TemplateDeclaration *td;

    s = ad->search(Loc(), funcid, 0);
    if (s)
    {   Dsymbol *s2;

        //printf("search_function: s = '%s'\n", s->kind());
        s2 = s->toAlias();
        //printf("search_function: s2 = '%s'\n", s2->kind());
        fd = s2->isFuncDeclaration();
        if (fd && fd->type->ty == Tfunction)
            return fd;

        td = s2->isTemplateDeclaration();
        if (td)
            return td;
    }
    return NULL;
}

std::string getProgram(const char *name, const llvm::cl::opt<std::string> *opt,
                       const char *envVar) {
  std::string path;
  const char *prog = nullptr;

  if (opt && !opt->empty()) {
    path = findProgramByName(opt->c_str());
  }

  if (path.empty() && envVar && (prog = getenv(envVar)) && prog[0] != '\0') {
    path = findProgramByName(prog);
  }

  if (path.empty()) {
    path = findProgramByName(name);
  }

  if (path.empty()) {
    error(Loc(), "failed to locate %s", name);
    fatal();
  }

  return path;
}

void AggregateDeclaration::semantic3(Scope *sc)
{
    //printf("AggregateDeclaration::semantic3(%s)\n", toChars());
    if (members)
    {
        sc = sc->push(this);
        sc->parent = this;
        for (size_t i = 0; i < members->dim; i++)
        {
            Dsymbol *s = (*members)[i];
            s->semantic3(sc);
        }
        sc = sc->pop();

        if (!getRTInfo && Type::rtinfo &&
            (!isDeprecated() || global.params.useDeprecated) && // don't do it for unused deprecated types
            (type && type->ty != Terror)) // or error types
        {   // Evaluate: gcinfo!type
            Objects *tiargs = new Objects();
            tiargs->push(type);
            TemplateInstance *ti = new TemplateInstance(loc, Type::rtinfo, tiargs);
            ti->semantic(sc);
            ti->semantic2(sc);
            ti->semantic3(sc);
            Dsymbol *s = ti->toAlias();
            Expression *e = new DsymbolExp(Loc(), s, 0);

            Scope *sc = ti->tempdecl->scope->startCTFE();
            e = e->semantic(sc);
            sc->endCTFE();

            e = e->ctfeInterpret();
            getRTInfo = e;
        }
    }
}

Symbol *VarDeclaration::toSymbol()
{
    //printf("VarDeclaration::toSymbol(%s)\n", toChars());
    //if (needThis()) *(char*)0=0;
    assert(!needThis());
    if (!csym)
    {
        TYPE *t;
        const char *id;

        if (isDataseg())
            id = mangle();
        else
            id = ident->toChars();
        Symbol *s = symbol_calloc(id);
        s->Salignment = alignment;

        if (storage_class & (STCout | STCref))
        {
            // should be TYref, but problems in back end
            t = type_pointer(type->toCtype());
        }
        else if (storage_class & STClazy)
        {
            if (config.exe == EX_WIN64 && isParameter())
                t = type_fake(TYnptr);
            else
                t = type_fake(TYdelegate);          // Tdelegate as C type
            t->Tcount++;
        }
        else if (isParameter())
        {
            if (config.exe == EX_WIN64 && type->size(Loc()) > REGSIZE)
            {
                // should be TYref, but problems in back end
                t = type_pointer(type->toCtype());
            }
            else
            {
                t = type->toCParamtype();
                t->Tcount++;
            }
        }
        else
        {
            t = type->toCtype();
            t->Tcount++;
        }

        if (isDataseg())
        {
            if (isThreadlocal())
            {   /* Thread local storage
                 */
                TYPE *ts = t;
                ts->Tcount++;   // make sure a different t is allocated
                type_setty(&t, t->Tty | mTYthread);
                ts->Tcount--;

                if (global.params.vtls)
                {
                    char *p = loc.toChars();
                    fprintf(stderr, "%s: %s is thread local\n", p ? p : "", toChars());
                    if (p)
                        mem.free(p);
                }
            }
            s->Sclass = SCextern;
            s->Sfl = FLextern;
            slist_add(s);
            /* if it's global or static, then it needs to have a qualified but unmangled name.
             * This gives some explanation of the separation in treating name mangling.
             * It applies to PDB format, but should apply to CV as PDB derives from CV.
             *    http://msdn.microsoft.com/en-us/library/ff553493(VS.85).aspx
             */
            s->prettyIdent = toPrettyChars();
        }
        else
        {
            s->Sclass = SCauto;
            s->Sfl = FLauto;

            if (nestedrefs.dim)
            {
                /* Symbol is accessed by a nested function. Make sure
                 * it is not put in a register, and that the optimizer
                 * assumes it is modified across function calls and pointer
                 * dereferences.
                 */
                //printf("\tnested ref, not register\n");
                type_setcv(&t, t->Tty | mTYvolatile);
            }
        }

        if (ident == Id::va_argsave)
            /* __va_argsave is set outside of the realm of the optimizer,
             * so we tell the optimizer to leave it alone
             */
            type_setcv(&t, t->Tty | mTYvolatile);

//.........这里部分代码省略.........

TypeInfoDeclaration *Type::buildTypeInfo(Scope *sc, bool checkNeedSemantic)
{
    if (vtinfo)
        return vtinfo;
    if (sc && checkNeedSemantic && !typeInfoNeedsSemantic())
        return 0;

    //printf("Type::getTypeInfo() %p, %s\n", this, toChars());
    if (!Type::dtypeinfo)
    {
        error(Loc(), "TypeInfo not found. object.d may be incorrectly installed or corrupt, compile with -v switch");
        fatal();
    }

    Type *t = merge2(); // do this since not all Type's are merge'd
    if (!t->vtinfo)
    {
        if (t->isShared())      // does both 'shared' and 'shared const'
            t->vtinfo = new TypeInfoSharedDeclaration(t);
        else if (t->isConst())
            t->vtinfo = new TypeInfoConstDeclaration(t);
        else if (t->isImmutable())
            t->vtinfo = new TypeInfoInvariantDeclaration(t);
        else if (t->isWild())
            t->vtinfo = new TypeInfoWildDeclaration(t);
        else
            t->vtinfo = t->getTypeInfoDeclaration();
        assert(t->vtinfo);
        vtinfo = t->vtinfo;

        /* If this has a custom implementation in std/typeinfo, then
         * do not generate a COMDAT for it.
         */
        if (t->ty == Terror)
            vtinfo->errors = 1;
        else 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);
                if(m->semanticRun >= 3)
                {
                    Module::addDeferredSemantic3(t->vtinfo);
                    t->vtinfo->deferredScope = sc;
                    sc->setNoFree();
                }
                if (ty == Tstruct)
                {
                    Dsymbol *s;
                    StructDeclaration *sd = ((TypeStruct *)this)->sym;
                    if (sd->members &&
                        (sd->xeq  && sd->xeq  != sd->xerreq  ||
                         sd->xcmp && sd->xcmp != sd->xerrcmp ||
                         search_toHash(sd) ||
                         search_toString(sd)
                        ) && inNonRoot(sd))
                    {
                        //printf("deferred sem3 for TypeInfo - sd = %s, inNonRoot = %d\n", sd->toChars(), inNonRoot(sd));
                        Module::addDeferredSemantic3(sd);
                    }
                }
            }
            else                        // if in obj generation pass
            {
                // it is always a problem if this is called from the backend without
                //  being added to the AST for semantic analysis (no RTInfo generated)
                // to ease transition, modifier types are just put out as they just forward
                //  to the actual TypeInfo
                if (t->typeInfoNeedsSemantic())
                    error(Loc(), "ICE: unexpected type info request for %s", t->toChars());
                t->vtinfo->toObjFile(global.params.multiobj);
            }
        }
    }
    if (!vtinfo)
        vtinfo = t->vtinfo;     // Types aren't merged, but we can share the vtinfo's
    return vtinfo;
}

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

//.........这里部分代码省略.........
    {
        localgot = NULL;

        Statement *sbody = fd->fbody;

        Blockx bx;
        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 = fd;
        bx.module = fd->getModule();
        irs.blx = &bx;

        /* Doing this in semantic3() caused all kinds of problems:
         * 1. couldn't reliably get the final mangling of the function name due to fwd refs
         * 2. impact on function inlining
         * 3. what to do when writing out .di files, or other pretty printing
         */
        if (global.params.trace && !fd->isCMain())
        {
            /* The profiler requires TLS, and TLS may not be set up yet when C main()
             * gets control (i.e. OSX), leading to a crash.
             */
            /* Wrap the entire function body in:
             *   trace_pro("funcname");
             *   try
             *     body;
             *   finally
             *     _c_trace_epi();
             */
            StringExp *se = StringExp::create(Loc(), s->Sident);
            se->type = Type::tstring;
            se->type = se->type->semantic(Loc(), NULL);
            Expressions *exps = Expressions_create();
            exps->push(se);
            FuncDeclaration *fdpro = FuncDeclaration::genCfunc(NULL, Type::tvoid, "trace_pro");
            Expression *ec = VarExp::create(Loc(), fdpro);
            Expression *e = CallExp::create(Loc(), ec, exps);
            e->type = Type::tvoid;
            Statement *sp = ExpStatement::create(fd->loc, e);

            FuncDeclaration *fdepi = FuncDeclaration::genCfunc(NULL, Type::tvoid, "_c_trace_epi");
            ec = VarExp::create(Loc(), fdepi);
            e = CallExp::create(Loc(), ec);
            e->type = Type::tvoid;
            Statement *sf = ExpStatement::create(fd->loc, e);

            Statement *stf;
            if (sbody->blockExit(fd, false) == BEfallthru)
                stf = CompoundStatement::create(Loc(), sbody, sf);
            else
                stf = TryFinallyStatement::create(Loc(), sbody, sf);
            sbody = CompoundStatement::create(Loc(), sp, stf);
        }

        buildClosure(fd, &irs);

#if TARGET_WINDOS
        if (fd->isSynchronized() && cd && config.flags2 & CFG2seh &&
            !fd->isStatic() && !sbody->usesEH() && !global.params.trace)
        {
            /* The "jmonitor" hack uses an optimized exception handling frame
             * which is a little shorter than the more general EH frame.

int runLINK()
{
#if _WIN32
    if (global.params.is64bit)
    {
        OutBuffer cmdbuf;

        cmdbuf.writestring("/NOLOGO ");

        for (size_t i = 0; i < global.params.objfiles->dim; i++)
        {
            if (i)
                cmdbuf.writeByte(' ');
            const char *p = (*global.params.objfiles)[i];
            const char *basename = FileName::removeExt(FileName::name(p));
            const char *ext = FileName::ext(p);
            if (ext && !strchr(basename, '.'))
            {
                // Write name sans extension (but not if a double extension)
                writeFilename(&cmdbuf, p, ext - p - 1);
            }
            else
                writeFilename(&cmdbuf, p);
            FileName::free(basename);
        }

        if (global.params.resfile)
        {
            cmdbuf.writeByte(' ');
            writeFilename(&cmdbuf, global.params.resfile);
        }

        cmdbuf.writeByte(' ');
        if (global.params.exefile)
        {   cmdbuf.writestring("/OUT:");
            writeFilename(&cmdbuf, global.params.exefile);
        }
        else
        {   /* Generate exe file name from first obj name.
             * No need to add it to cmdbuf because the linker will default to it.
             */
            const char *n = (*global.params.objfiles)[0];
            n = FileName::name(n);
            global.params.exefile = (char *)FileName::forceExt(n, "exe");
        }

        // Make sure path to exe file exists
        ensurePathToNameExists(Loc(), global.params.exefile);

        cmdbuf.writeByte(' ');
        if (global.params.mapfile)
        {   cmdbuf.writestring("/MAP:");
            writeFilename(&cmdbuf, global.params.mapfile);
        }
        else if (global.params.map)
        {
            const char *fn = FileName::forceExt(global.params.exefile, "map");

            const char *path = FileName::path(global.params.exefile);
            const char *p;
            if (path[0] == '\0')
                p = FileName::combine(global.params.objdir, fn);
            else
                p = fn;

            cmdbuf.writestring("/MAP:");
            writeFilename(&cmdbuf, p);
        }

        for (size_t i = 0; i < global.params.libfiles->dim; i++)
        {
            cmdbuf.writeByte(' ');
            cmdbuf.writestring("/DEFAULTLIB:");
            writeFilename(&cmdbuf, (*global.params.libfiles)[i]);
        }

        if (global.params.deffile)
        {
            cmdbuf.writeByte(' ');
            cmdbuf.writestring("/DEF:");
            writeFilename(&cmdbuf, global.params.deffile);
        }

        if (global.params.symdebug)
        {
            cmdbuf.writeByte(' ');
            cmdbuf.writestring("/DEBUG");

            // in release mode we need to reactivate /OPT:REF after /DEBUG
            if (global.params.release)
                cmdbuf.writestring(" /OPT:REF");
        }

        if (global.params.dll)
        {
            cmdbuf.writeByte(' ');
            cmdbuf.writestring("/DLL");
        }

        for (size_t i = 0; i < global.params.linkswitches->dim; i++)
//.........这里部分代码省略.........

FuncDeclaration *buildArrayOp(Identifier *ident, BinExp *exp, Scope *sc)
{
    Parameters *fparams = new Parameters();
    Expression *loopbody = buildArrayLoop(exp, fparams);

    /* Construct the function body:
     *  foreach (i; 0 .. p.length)    for (size_t i = 0; i < p.length; i++)
     *      loopbody;
     *  return p;
     */

    Parameter *p = (*fparams)[0];
    // foreach (i; 0 .. p.length)
    Statement *s1 = new ForeachRangeStatement(Loc(), TOKforeach,
        new Parameter(0, NULL, Id::p, NULL),
        new IntegerExp(Loc(), 0, Type::tsize_t),
        new ArrayLengthExp(Loc(), new IdentifierExp(Loc(), p->ident)),
        new ExpStatement(Loc(), loopbody),
        Loc());
    //printf("%s\n", s1->toChars());
    Statement *s2 = new ReturnStatement(Loc(), new IdentifierExp(Loc(), p->ident));
    //printf("s2: %s\n", s2->toChars());
    Statement *fbody = new CompoundStatement(Loc(), s1, s2);

    // Built-in array ops should be @trusted, pure, nothrow and nogc
    StorageClass stc = STCtrusted | STCpure | STCnothrow | STCnogc;

    /* Construct the function
     */
    TypeFunction *ftype = new TypeFunction(fparams, exp->e1->type, 0, LINKc, stc);
    //printf("fd: %s %s\n", ident->toChars(), ftype->toChars());
    FuncDeclaration *fd = new FuncDeclaration(Loc(), Loc(), ident, STCundefined, ftype);
    fd->fbody = fbody;
    fd->protection = Prot(PROTpublic);
    fd->linkage = LINKc;
    fd->isArrayOp = 1;

    sc->_module->importedFrom->members->push(fd);

    sc = sc->push();
    sc->parent = sc->_module->importedFrom;
    sc->stc = 0;
    sc->linkage = LINKc;
    fd->semantic(sc);
    fd->semantic2(sc);
    unsigned errors = global.startGagging();
    fd->semantic3(sc);
    if (global.endGagging(errors))
    {
        fd->type = Type::terror;
        fd->errors = true;
        fd->fbody = NULL;
    }
    sc->pop();

    return fd;
}

/*****************************************
 * Create inclusive destructor for struct/class by aggregating
 * all the destructors in dtors[] with the destructors for
 * all the members.
 * Note the close similarity with StructDeclaration::buildPostBlit(),
 * and the ordering changes (runs backward instead of forwards).
 */
FuncDeclaration *buildDtor(AggregateDeclaration *ad, Scope *sc)
{
    //printf("AggregateDeclaration::buildDtor() %s\n", ad->toChars());
    StorageClass stc = STCsafe | STCnothrow | STCpure | STCnogc;
    Loc declLoc = ad->dtors.dim ? ad->dtors[0]->loc : ad->loc;
    Loc loc = Loc();    // internal code should have no loc to prevent coverage

    Expression *e = NULL;
    for (size_t i = 0; i < ad->fields.dim; i++)
    {
        VarDeclaration *v = ad->fields[i];
        if (v->storage_class & STCref)
            continue;
        Type *tv = v->type->baseElemOf();
        if (tv->ty != Tstruct || !v->type->size())
            continue;
        StructDeclaration *sdv = ((TypeStruct *)tv)->sym;
        if (!sdv->dtor)
            continue;
        sdv->dtor->functionSemantic();

        stc = mergeFuncAttrs(stc, sdv->dtor);
        if (stc & STCdisable)
        {
            e = NULL;
            break;
        }

        Expression *ex = new ThisExp(loc);
        ex = new DotVarExp(loc, ex, v, 0);
        if (v->type->toBasetype()->ty == Tstruct)
        {
            // this.v.__xdtor()

            // This is a hack so we can call destructors on const/immutable objects.
            ex = new AddrExp(loc, ex);
            ex = new CastExp(loc, ex, v->type->mutableOf()->pointerTo());
            ex = new PtrExp(loc, ex);
            if (stc & STCsafe)
                stc = (stc & ~STCsafe) | STCtrusted;

            ex = new DotVarExp(loc, ex, sdv->dtor, 0);
            ex = new CallExp(loc, ex);
        }
        else
        {
            // _ArrayDtor((cast(S*)this.v.ptr)[0 .. n])

            // This is a hack so we can call destructors on const/immutable objects.
            ex = new DotIdExp(loc, ex, Id::ptr);
            ex = new CastExp(loc, ex, sdv->type->pointerTo());
            if (stc & STCsafe)
                stc = (stc & ~STCsafe) | STCtrusted;

            uinteger_t n = v->type->size() / sdv->type->size();
            ex = new SliceExp(loc, ex, new IntegerExp(loc, 0, Type::tsize_t),
                                       new IntegerExp(loc, n, Type::tsize_t));
            // Prevent redundant bounds check
            ((SliceExp *)ex)->upperIsInBounds = true;
            ((SliceExp *)ex)->lowerIsLessThanUpper = true;

            ex = new CallExp(loc, new IdentifierExp(loc, Id::_ArrayDtor), ex);
        }
        e = Expression::combine(ex, e); // combine in reverse order
    }

    /* Build our own "destructor" which executes e
     */
    if (e || (stc & STCdisable))
    {
        //printf("Building __fieldDtor()\n");
        DtorDeclaration *dd = new DtorDeclaration(declLoc, Loc(), stc, Id::__fieldDtor);
        dd->storage_class |= STCinference;
        dd->fbody = new ExpStatement(loc, e);
        ad->dtors.shift(dd);
        ad->members->push(dd);
        dd->semantic(sc);
    }

    FuncDeclaration *xdtor = NULL;
    switch (ad->dtors.dim)
    {
        case 0:
            break;

        case 1:
            xdtor = ad->dtors[0];
            break;

        default:
            e = NULL;
            stc = STCsafe | STCnothrow | STCpure | STCnogc;
            for (size_t i = 0; i < ad->dtors.dim; i++)
//.........这里部分代码省略.........

/******************************************
 * Build __xopCmp for TypeInfo_Struct
 *      static bool __xopCmp(ref const S p, ref const S q)
 *      {
 *          return p.opCmp(q);
 *      }
 *
 * This is called by TypeInfo.compare(p1, p2). If the struct does not support
 * const objects comparison, it will throw "not implemented" Error in runtime.
 */
FuncDeclaration *buildXopCmp(StructDeclaration *sd, Scope *sc)
{
    //printf("StructDeclaration::buildXopCmp() %s\n", toChars());
    if (Dsymbol *cmp = search_function(sd, Id::cmp))
    {
        if (FuncDeclaration *fd = cmp->isFuncDeclaration())
        {
            TypeFunction *tfcmpptr;
            {
                Scope scx;

                /* const int opCmp(ref const S s);
                 */
                Parameters *parameters = new Parameters;
                parameters->push(new Parameter(STCref | STCconst, sd->type, NULL, NULL));
                tfcmpptr = new TypeFunction(parameters, Type::tint32, 0, LINKd);
                tfcmpptr->mod = MODconst;
                tfcmpptr = (TypeFunction *)tfcmpptr->semantic(Loc(), &scx);
            }
            fd = fd->overloadExactMatch(tfcmpptr);
            if (fd)
                return fd;
        }
    }
    else
    {
#if 0   // FIXME: doesn't work for recursive alias this
        /* Check opCmp member exists.
         * Consider 'alias this', but except opDispatch.
         */
        Expression *e = new DsymbolExp(sd->loc, sd);
        e = new DotIdExp(sd->loc, e, Id::cmp);
        Scope *sc2 = sc->push();
        e = e->trySemantic(sc2);
        sc2->pop();
        if (e)
        {
            Dsymbol *s = NULL;
            switch (e->op)
            {
                case TOKoverloadset:    s = ((OverExp *)e)->vars;       break;
                case TOKimport:         s = ((ScopeExp *)e)->sds;       break;
                case TOKvar:            s = ((VarExp *)e)->var;         break;
                default:                break;
            }
            if (!s || s->ident != Id::cmp)
                e = NULL;   // there's no valid member 'opCmp'
        }
        if (!e)
            return NULL;    // bitwise comparison would work
        /* Essentially, a struct which does not define opCmp is not comparable.
         * At this time, typeid(S).compare might be correct that throwing "not implement" Error.
         * But implementing it would break existing code, such as:
         *
         * struct S { int value; }  // no opCmp
         * int[S] aa;   // Currently AA key uses bitwise comparison
         *              // (It's default behavior of TypeInfo_Strust.compare).
         *
         * Not sure we should fix this inconsistency, so just keep current behavior.
         */
#else
        return NULL;
#endif
    }

    if (!sd->xerrcmp)
    {
        // object._xopCmp
        Identifier *id = Identifier::idPool("_xopCmp");
        Expression *e = new IdentifierExp(sd->loc, Id::empty);
        e = new DotIdExp(sd->loc, e, Id::object);
        e = new DotIdExp(sd->loc, e, id);
        e = e->semantic(sc);
        Dsymbol *s = getDsymbol(e);
        assert(s);
        sd->xerrcmp = s->isFuncDeclaration();
    }

    Loc declLoc = Loc();    // loc is unnecessary so __xopCmp is never called directly
    Loc loc = Loc();        // loc is unnecessary so errors are gagged

    Parameters *parameters = new Parameters;
    parameters->push(new Parameter(STCref | STCconst, sd->type, Id::p, NULL));
    parameters->push(new Parameter(STCref | STCconst, sd->type, Id::q, NULL));
    TypeFunction *tf = new TypeFunction(parameters, Type::tint32, 0, LINKd);

    Identifier *id = Id::xopCmp;
    FuncDeclaration *fop = new FuncDeclaration(declLoc, Loc(), id, STCstatic, tf);

    Expression *e1 = new IdentifierExp(loc, Id::p);
//.........这里部分代码省略.........

 void FistMove (PointingEvent *e)
   { if (IsHeeding (e))
       IncTranslation (6.0 * FistMotion (e, Loc ()));
   }