/* Compiler implementation of the D programming language
 * Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved
 * written by Walter Bright
 * http://www.digitalmars.com
 * Distributed under the Boost Software License, Version 1.0.
 * http://www.boost.org/LICENSE_1_0.txt
 * https://github.com/dlang/dmd/blob/master/src/dmd/aggregate.h
 */

#pragma once

#include "root/root.h"

#include "dsymbol.h"
#include "declaration.h"
#include "objc.h"

class Identifier;
class Type;
class TypeFunction;
class Expression;
class FuncDeclaration;
class CtorDeclaration;
class DtorDeclaration;
class InvariantDeclaration;
class NewDeclaration;
class DeleteDeclaration;
class InterfaceDeclaration;
class TypeInfoClassDeclaration;
class VarDeclaration;

enum Sizeok
{
    SIZEOKnone,         // size of aggregate is not yet able to compute
    SIZEOKfwd,          // size of aggregate is ready to compute
    SIZEOKdone          // size of aggregate is set correctly
};

enum Baseok
{
    BASEOKnone,         // base classes not computed yet
    BASEOKin,           // in process of resolving base classes
    BASEOKdone,         // all base classes are resolved
    BASEOKsemanticdone  // all base classes semantic done
};

enum StructPOD
{
    ISPODno,            // struct is not POD
    ISPODyes,           // struct is POD
    ISPODfwd            // POD not yet computed
};

enum Abstract
{
    ABSfwdref = 0,      // whether an abstract class is not yet computed
    ABSyes,             // is abstract class
    ABSno               // is not abstract class
};

FuncDeclaration *hasIdentityOpAssign(AggregateDeclaration *ad, Scope *sc);
FuncDeclaration *buildOpAssign(StructDeclaration *sd, Scope *sc);
bool needOpEquals(StructDeclaration *sd);
FuncDeclaration *buildOpEquals(StructDeclaration *sd, Scope *sc);
FuncDeclaration *buildXopEquals(StructDeclaration *sd, Scope *sc);
FuncDeclaration *buildXopCmp(StructDeclaration *sd, Scope *sc);
FuncDeclaration *buildXtoHash(StructDeclaration *ad, Scope *sc);
FuncDeclaration *buildPostBlit(StructDeclaration *sd, Scope *sc);
FuncDeclaration *buildDtor(AggregateDeclaration *ad, Scope *sc);
FuncDeclaration *buildInv(AggregateDeclaration *ad, Scope *sc);
FuncDeclaration *search_toString(StructDeclaration *sd);

struct ClassKind
{
    enum Type
    {
        /// the class is a d(efault) class
        d,
        /// the class is a C++ interface
        cpp,
        /// the class is an Objective-C class/interface
        objc,
    };
};

class AggregateDeclaration : public ScopeDsymbol
{
public:
    Type *type;
    StorageClass storage_class;
    Prot protection;
    unsigned structsize;        // size of struct
    unsigned alignsize;         // size of struct for alignment purposes
    VarDeclarations fields;     // VarDeclaration fields
    Sizeok sizeok;              // set when structsize contains valid data
    Dsymbol *deferred;          // any deferred semantic2() or semantic3() symbol
    bool isdeprecated;          // true if deprecated

    ClassKind::Type classKind;  // specifies the linkage type

    /* !=NULL if is nested
     * pointing to the dsymbol that directly enclosing it.
     * 1. The function that enclosing it (nested struct and class)
     * 2. The class that enclosing it (nested class only)
     * 3. If enclosing aggregate is template, its enclosing dsymbol.
     * See AggregateDeclaraton::makeNested for the details.
     */
    Dsymbol *enclosing;
    VarDeclaration *vthis;      // 'this' parameter if this aggregate is nested
    // Special member functions
    FuncDeclarations invs;              // Array of invariants
    FuncDeclaration *inv;               // invariant
    NewDeclaration *aggNew;             // allocator
    DeleteDeclaration *aggDelete;       // deallocator

    Dsymbol *ctor;                      // CtorDeclaration or TemplateDeclaration

    // default constructor - should have no arguments, because
    // it would be stored in TypeInfo_Class.defaultConstructor
    CtorDeclaration *defaultCtor;

    Dsymbol *aliasthis;         // forward unresolved lookups to aliasthis
    bool noDefaultCtor;         // no default construction

    FuncDeclarations dtors;     // Array of destructors
    FuncDeclaration *dtor;      // aggregate destructor

    Expression *getRTInfo;      // pointer to GC info generated by object.RTInfo(this)

    AggregateDeclaration(Loc loc, Identifier *id);
    virtual Scope *newScope(Scope *sc);
    void setScope(Scope *sc);
    void semantic2(Scope *sc);
    void semantic3(Scope *sc);
    bool determineFields();
    bool determineSize(Loc loc);
    virtual void finalizeSize() = 0;
    d_uns64 size(Loc loc);
    bool checkOverlappedFields();
    bool fill(Loc loc, Expressions *elements, bool ctorinit);
    static void alignmember(structalign_t salign, unsigned size, unsigned *poffset);
    static unsigned placeField(unsigned *nextoffset,
        unsigned memsize, unsigned memalignsize, structalign_t memalign,
        unsigned *paggsize, unsigned *paggalignsize, bool isunion);
    Type *getType();
    bool isDeprecated();         // is aggregate deprecated?
    bool isNested();
    void makeNested();
    bool isExport() const;
    Dsymbol *searchCtor();

    Prot prot();

    // 'this' type
    Type *handleType() { return type; }

    // Back end
    Symbol *stag;               // tag symbol for debug data
    Symbol *sinit;

    AggregateDeclaration *isAggregateDeclaration() { return this; }
    void accept(Visitor *v) { v->visit(this); }
};

struct StructFlags
{
    typedef unsigned Type;
    enum Enum
    {
        none = 0x0,
        hasPointers = 0x1  // NB: should use noPointers as in ClassFlags
    };
};

class StructDeclaration : public AggregateDeclaration
{
public:
    int zeroInit;               // !=0 if initialize with 0 fill
    bool hasIdentityAssign;     // true if has identity opAssign
    bool hasIdentityEquals;     // true if has identity opEquals
    FuncDeclarations postblits; // Array of postblit functions
    FuncDeclaration *postblit;  // aggregate postblit

    FuncDeclaration *xeq;       // TypeInfo_Struct.xopEquals
    FuncDeclaration *xcmp;      // TypeInfo_Struct.xopCmp
    FuncDeclaration *xhash;     // TypeInfo_Struct.xtoHash
    static FuncDeclaration *xerreq;      // object.xopEquals
    static FuncDeclaration *xerrcmp;     // object.xopCmp

    structalign_t alignment;    // alignment applied outside of the struct
    StructPOD ispod;            // if struct is POD

    // For 64 bit Efl function call/return ABI
    Type *arg1type;
    Type *arg2type;

    // Even if struct is defined as non-root symbol, some built-in operations
    // (e.g. TypeidExp, NewExp, ArrayLiteralExp, etc) request its TypeInfo.
    // For those, today TypeInfo_Struct is generated in COMDAT.
    bool requestTypeInfo;

    StructDeclaration(Loc loc, Identifier *id, bool inObject);
    static StructDeclaration *create(Loc loc, Identifier *id, bool inObject);
    Dsymbol *syntaxCopy(Dsymbol *s);
    void semantic(Scope *sc);
    void semanticTypeInfoMembers();
    Dsymbol *search(const Loc &loc, Identifier *ident, int flags = SearchLocalsOnly);
    const char *kind() const;
    void finalizeSize();
    bool fit(Loc loc, Scope *sc, Expressions *elements, Type *stype);
    bool isPOD();

    StructDeclaration *isStructDeclaration() { return this; }
    void accept(Visitor *v) { v->visit(this); }
};

class UnionDeclaration : public StructDeclaration
{
public:
    UnionDeclaration(Loc loc, Identifier *id);
    Dsymbol *syntaxCopy(Dsymbol *s);
    const char *kind() const;

    UnionDeclaration *isUnionDeclaration() { return this; }
    void accept(Visitor *v) { v->visit(this); }
};

struct BaseClass
{
    Type *type;                         // (before semantic processing)

    ClassDeclaration *sym;
    unsigned offset;                    // 'this' pointer offset
    // for interfaces: Array of FuncDeclaration's
    // making up the vtbl[]
    FuncDeclarations vtbl;

    DArray<BaseClass> baseInterfaces;   // if BaseClass is an interface, these
                                        // are a copy of the InterfaceDeclaration::interfaces

    BaseClass();
    BaseClass(Type *type);

    bool fillVtbl(ClassDeclaration *cd, FuncDeclarations *vtbl, int newinstance);
    void copyBaseInterfaces(BaseClasses *);
};

struct ClassFlags
{
    typedef unsigned Type;
    enum Enum
    {
        isCOMclass = 0x1,
        noPointers = 0x2,
        hasOffTi = 0x4,
        hasCtor = 0x8,
        hasGetMembers = 0x10,
        hasTypeInfo = 0x20,
        isAbstract = 0x40,
        isCPPclass = 0x80,
        hasDtor = 0x100
    };
};

class ClassDeclaration : public AggregateDeclaration
{
public:
    static ClassDeclaration *object;
    static ClassDeclaration *throwable;
    static ClassDeclaration *exception;
    static ClassDeclaration *errorException;
    static ClassDeclaration *cpp_type_info_ptr;

    ClassDeclaration *baseClass;        // NULL only if this is Object
    FuncDeclaration *staticCtor;
    FuncDeclaration *staticDtor;
    Dsymbols vtbl;                      // Array of FuncDeclaration's making up the vtbl[]
    Dsymbols vtblFinal;                 // More FuncDeclaration's that aren't in vtbl[]

    BaseClasses *baseclasses;           // Array of BaseClass's; first is super,
                                        // rest are Interface's

    DArray<BaseClass*> interfaces;      // interfaces[interfaces_dim] for this class
                                        // (does not include baseClass)

    BaseClasses *vtblInterfaces;        // array of base interfaces that have
                                        // their own vtbl[]

    TypeInfoClassDeclaration *vclassinfo;       // the ClassInfo object for this ClassDeclaration
    bool com;                           // true if this is a COM class (meaning it derives from IUnknown)
    bool isscope;                       // true if this is a scope class
    Abstract isabstract;                // 0: fwdref, 1: is abstract class, 2: not abstract
    int inuse;                          // to prevent recursive attempts
    Baseok baseok;                      // set the progress of base classes resolving
    Symbol *cpp_type_info_ptr_sym;      // cached instance of class Id.cpp_type_info_ptr

    ClassDeclaration(Loc loc, Identifier *id, BaseClasses *baseclasses, Dsymbols *members, bool inObject = false);
    static ClassDeclaration *create(Loc loc, Identifier *id, BaseClasses *baseclasses, Dsymbols *members, bool inObject);
    Dsymbol *syntaxCopy(Dsymbol *s);
    Scope *newScope(Scope *sc);
    void semantic(Scope *sc);
    bool isBaseOf2(ClassDeclaration *cd);

    #define OFFSET_RUNTIME 0x76543210
    #define OFFSET_FWDREF 0x76543211
    virtual bool isBaseOf(ClassDeclaration *cd, int *poffset);

    bool isBaseInfoComplete();
    Dsymbol *search(const Loc &loc, Identifier *ident, int flags = SearchLocalsOnly);
    ClassDeclaration *searchBase(Identifier *ident);
    void finalizeSize();
    bool isFuncHidden(FuncDeclaration *fd);
    FuncDeclaration *findFunc(Identifier *ident, TypeFunction *tf);
    void interfaceSemantic(Scope *sc);
    bool isCOMclass() const;
    virtual bool isCOMinterface() const;
    bool isCPPclass() const;
    virtual bool isCPPinterface() const;
    bool isAbstract();
    virtual int vtblOffset() const;
    const char *kind() const;

    void addLocalClass(ClassDeclarations *);

    // Back end
    Symbol *vtblsym;

    ClassDeclaration *isClassDeclaration() { return (ClassDeclaration *)this; }
    void accept(Visitor *v) { v->visit(this); }
};

class InterfaceDeclaration : public ClassDeclaration
{
public:
    InterfaceDeclaration(Loc loc, Identifier *id, BaseClasses *baseclasses);
    Dsymbol *syntaxCopy(Dsymbol *s);
    Scope *newScope(Scope *sc);
    void semantic(Scope *sc);
    bool isBaseOf(ClassDeclaration *cd, int *poffset);
    bool isBaseOf(BaseClass *bc, int *poffset);
    const char *kind() const;
    int vtblOffset() const;
    bool isCPPinterface() const;
    bool isCOMinterface() const;

    InterfaceDeclaration *isInterfaceDeclaration() { return this; }
    void accept(Visitor *v) { v->visit(this); }
};