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dclass.d
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/**
* Defines a `class` declaration.
*
* Specification: $(LINK2 https://dlang.org/spec/class.html, Classes)
*
* Copyright: Copyright (C) 1999-2025 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/compiler/src/dmd/dclass.d, _dclass.d)
* Documentation: https://dlang.org/phobos/dmd_dclass.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/compiler/src/dmd/dclass.d
*/
module dmd.dclass;
import core.stdc.stdio;
import core.stdc.string;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.astenums;
import dmd.gluelayer;
import dmd.declaration;
import dmd.dscope;
import dmd.dsymbol;
import dmd.dsymbolsem : dsymbolSemantic, addMember, setFieldOffset;
import dmd.errors;
import dmd.func;
import dmd.id;
import dmd.identifier;
import dmd.location;
import dmd.mtype;
import dmd.objc;
import dmd.root.rmem;
import dmd.target;
import dmd.typesem : covariant, immutableOf, sarrayOf;
import dmd.visitor;
/***********************************************************
*/
extern (C++) struct BaseClass
{
Type type; // (before semantic processing)
ClassDeclaration sym;
uint offset; // 'this' pointer offset
// for interfaces: Array of FuncDeclaration's making up the vtbl[]
FuncDeclarations vtbl;
// if BaseClass is an interface, these
// are a copy of the InterfaceDeclaration.interfaces
BaseClass[] baseInterfaces;
extern (D) this(Type type)
{
//printf("BaseClass(this = %p, '%s')\n", this, type.toChars());
this.type = type;
}
/****************************************
* Fill in vtbl[] for base class based on member functions of class cd.
* Input:
* vtbl if !=NULL, fill it in
* newinstance !=0 means all entries must be filled in by members
* of cd, not members of any base classes of cd.
* Returns:
* true if any entries were filled in by members of cd (not exclusively
* by base classes)
*/
extern (C++) bool fillVtbl(ClassDeclaration cd, FuncDeclarations* vtbl, int newinstance)
{
bool result = false;
//printf("BaseClass.fillVtbl(this='%s', cd='%s')\n", sym.toChars(), cd.toChars());
if (vtbl)
vtbl.setDim(sym.vtbl.length);
// first entry is ClassInfo reference
for (size_t j = sym.vtblOffset(); j < sym.vtbl.length; j++)
{
FuncDeclaration ifd = sym.vtbl[j].isFuncDeclaration();
//printf(" vtbl[%d] is '%s'\n", j, ifd ? ifd.toChars() : "null");
assert(ifd);
// Find corresponding function in this class
auto tf = ifd.type.toTypeFunction();
auto fd = cd.findFunc(ifd.ident, tf);
if (fd && !fd.isAbstract())
{
if (fd.toParent() == cd)
result = true;
}
else
fd = null;
if (vtbl)
(*vtbl)[j] = fd;
}
return result;
}
extern (D) void copyBaseInterfaces(BaseClasses* vtblInterfaces)
{
//printf("+copyBaseInterfaces(), %s\n", sym.toChars());
// if (baseInterfaces.length)
// return;
auto bc = cast(BaseClass*)mem.xcalloc(sym.interfaces.length, BaseClass.sizeof);
baseInterfaces = bc[0 .. sym.interfaces.length];
//printf("%s.copyBaseInterfaces()\n", sym.toChars());
for (size_t i = 0; i < baseInterfaces.length; i++)
{
BaseClass* b = &baseInterfaces[i];
BaseClass* b2 = sym.interfaces[i];
assert(b2.vtbl.length == 0); // should not be filled yet
memcpy(b, b2, BaseClass.sizeof);
if (i) // single inheritance is i==0
vtblInterfaces.push(b); // only need for M.I.
b.copyBaseInterfaces(vtblInterfaces);
}
//printf("-copyBaseInterfaces\n");
}
}
// These must match the values in druntime/src/object.d
enum ClassFlags : uint
{
none = 0x0,
isCOMclass = 0x1,
noPointers = 0x2,
hasOffTi = 0x4,
hasCtor = 0x8,
hasGetMembers = 0x10,
hasTypeInfo = 0x20,
isAbstract = 0x40,
isCPPclass = 0x80,
hasDtor = 0x100,
hasNameSig = 0x200,
}
/***********************************************************
*/
extern (C++) class ClassDeclaration : AggregateDeclaration
{
extern (C++) __gshared
{
// Names found by reading object.d in druntime
ClassDeclaration object;
ClassDeclaration throwable;
ClassDeclaration exception;
ClassDeclaration errorException;
ClassDeclaration cpp_type_info_ptr; // Object.__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[]
// Array of BaseClass's; first is super, rest are Interface's
BaseClasses* baseclasses;
/* Slice of baseclasses[] that does not include baseClass
*/
BaseClass*[] interfaces;
// array of base interfaces that have their own vtbl[]
BaseClasses* vtblInterfaces;
// the ClassInfo object for this ClassDeclaration
TypeInfoClassDeclaration vclassinfo;
// true if this is a COM class
bool com;
/// true if this is a scope class
bool stack;
/// if this is a C++ class, this is the slot reserved for the virtual destructor
int cppDtorVtblIndex = -1;
/// to prevent recursive attempts
bool inuse;
ThreeState isabstract;
/// set the progress of base classes resolving
Baseok baseok;
/**
* Data for a class declaration that is needed for the Objective-C
* integration.
*/
ObjcClassDeclaration objc;
version (IN_LLVM) {} else
{
Symbol* cpp_type_info_ptr_sym; // cached instance of class Id.cpp_type_info_ptr
}
final extern (D) this(Loc loc, Identifier id, BaseClasses* baseclasses, Dsymbols* members, bool inObject)
{
objc = ObjcClassDeclaration(this);
if (!id)
id = Identifier.generateAnonymousId("class");
super(loc, id);
this.dsym = DSYM.classDeclaration;
static immutable msg = "only object.d can define this reserved class name";
if (baseclasses)
{
// Actually, this is a transfer
this.baseclasses = baseclasses;
}
else
this.baseclasses = new BaseClasses();
this.members = members;
//printf("ClassDeclaration(%s), dim = %d\n", ident.toChars(), this.baseclasses.length);
// For forward references
type = new TypeClass(this);
// Look for special class names
if (id == Id.__sizeof || id == Id.__xalignof || id == Id._mangleof)
classError("%s `%s` illegal class name", null);
// BUG: What if this is the wrong TypeInfo, i.e. it is nested?
if (id.toChars()[0] == 'T')
{
if (id == Id.TypeInfo)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.dtypeinfo = this;
}
if (id == Id.TypeInfo_Class)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfoclass = this;
}
if (id == Id.TypeInfo_Interface)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfointerface = this;
}
if (id == Id.TypeInfo_Struct)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfostruct = this;
}
if (id == Id.TypeInfo_Pointer)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfopointer = this;
}
if (id == Id.TypeInfo_Array)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfoarray = this;
}
if (id == Id.TypeInfo_StaticArray)
{
//if (!inObject)
// Type.typeinfostaticarray.classError("%s `%s` %s", msg);
Type.typeinfostaticarray = this;
}
if (id == Id.TypeInfo_AssociativeArray)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfoassociativearray = this;
}
if (id == Id.TypeInfo_Enum)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfoenum = this;
}
if (id == Id.TypeInfo_Function)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfofunction = this;
}
if (id == Id.TypeInfo_Delegate)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfodelegate = this;
}
if (id == Id.TypeInfo_Tuple)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfotypelist = this;
}
if (id == Id.TypeInfo_Const)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfoconst = this;
}
if (id == Id.TypeInfo_Invariant)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfoinvariant = this;
}
if (id == Id.TypeInfo_Shared)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfoshared = this;
}
if (id == Id.TypeInfo_Wild)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfowild = this;
}
if (id == Id.TypeInfo_Vector)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
Type.typeinfovector = this;
}
}
if (id == Id.Object)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
object = this;
}
if (id == Id.Throwable)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
throwable = this;
}
if (id == Id.Exception)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
exception = this;
}
if (id == Id.Error)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
errorException = this;
}
if (id == Id.cpp_type_info_ptr)
{
if (!inObject)
classError("%s `%s` %s", msg.ptr);
cpp_type_info_ptr = this;
}
baseok = Baseok.none;
}
extern (D) final void classError(const(char)* fmt, const(char)* arg)
{
.error(loc, fmt, kind, toPrettyChars, arg);
}
static ClassDeclaration create(Loc loc, Identifier id, BaseClasses* baseclasses, Dsymbols* members, bool inObject)
{
return new ClassDeclaration(loc, id, baseclasses, members, inObject);
}
override const(char)* toPrettyChars(bool qualifyTypes = false)
{
if (objc.isMeta)
return .objc.toPrettyChars(this, qualifyTypes);
return super.toPrettyChars(qualifyTypes);
}
override ClassDeclaration syntaxCopy(Dsymbol s)
{
//printf("ClassDeclaration.syntaxCopy('%s')\n", toChars());
ClassDeclaration cd =
s ? cast(ClassDeclaration)s
: new ClassDeclaration(loc, ident, null, null, false);
cd.storage_class |= storage_class;
cd.baseclasses.setDim(this.baseclasses.length);
for (size_t i = 0; i < cd.baseclasses.length; i++)
{
BaseClass* b = (*this.baseclasses)[i];
auto b2 = new BaseClass(b.type.syntaxCopy());
(*cd.baseclasses)[i] = b2;
}
ScopeDsymbol.syntaxCopy(cd);
return cd;
}
override Scope* newScope(Scope* sc)
{
auto sc2 = super.newScope(sc);
if (isCOMclass())
{
/* This enables us to use COM objects under Linux and
* work with things like XPCOM
*/
sc2.linkage = target.systemLinkage();
}
return sc2;
}
/*********************************************
* Determine if 'this' is a base class of cd.
* This is used to detect circular inheritance only.
*/
extern (D) final bool isBaseOf2(ClassDeclaration cd) pure nothrow @nogc
{
if (!cd)
return false;
//printf("ClassDeclaration.isBaseOf2(this = '%s', cd = '%s')\n", toChars(), cd.toChars());
for (size_t i = 0; i < cd.baseclasses.length; i++)
{
BaseClass* b = (*cd.baseclasses)[i];
if (b.sym == this || isBaseOf2(b.sym))
return true;
}
return false;
}
enum OFFSET_RUNTIME = 0x76543210;
enum OFFSET_FWDREF = 0x76543211;
/*******************************************
* Determine if 'this' is a base class of cd.
*/
bool isBaseOf(ClassDeclaration cd, int* poffset) pure nothrow @nogc
{
//printf("ClassDeclaration.isBaseOf(this = '%s', cd = '%s')\n", toChars(), cd.toChars());
if (poffset)
*poffset = 0;
while (cd)
{
assert(cd.baseClass || cd.semanticRun >= PASS.semanticdone || cd.isInterfaceDeclaration());
if (this == cd.baseClass)
return true;
cd = cd.baseClass;
}
return false;
}
/*********************************************
* Determine if 'this' has complete base class information.
* This is used to detect forward references in covariant overloads.
*/
final bool isBaseInfoComplete() const
{
return baseok >= Baseok.done;
}
/************************************
* Search base classes in depth-first, left-to-right order for
* a class or interface named 'ident'.
* Stops at first found. Does not look for additional matches.
* Params:
* ident = identifier to search for
* Returns:
* ClassDeclaration if found, null if not
*/
extern (D) final ClassDeclaration searchBase(Identifier ident)
{
foreach (b; *baseclasses)
{
auto cdb = b.type.isClassHandle();
if (!cdb) // https://issues.dlang.org/show_bug.cgi?id=10616
return null;
if (cdb.ident.equals(ident))
return cdb;
if (auto result = cdb.searchBase(ident))
return result;
}
return null;
}
final override void finalizeSize()
{
assert(sizeok != Sizeok.done);
// Set the offsets of the fields and determine the size of the class
if (baseClass)
{
assert(baseClass.sizeok == Sizeok.done);
alignsize = baseClass.alignsize;
if (classKind == ClassKind.cpp)
structsize = target.cpp.derivedClassOffset(baseClass);
else
structsize = baseClass.structsize;
}
else if (classKind == ClassKind.objc)
structsize = 0; // no hidden member for an Objective-C class
else if (isInterfaceDeclaration())
{
if (interfaces.length == 0)
{
alignsize = target.ptrsize;
structsize = target.ptrsize; // allow room for __vptr
}
}
else
{
alignsize = target.ptrsize;
structsize = target.ptrsize; // allow room for __vptr
if (hasMonitor())
structsize += target.ptrsize; // allow room for __monitor
}
//printf("finalizeSize() %s, sizeok = %d\n", toChars(), sizeok);
size_t bi = 0; // index into vtblInterfaces[]
/****
* Runs through the inheritance graph to set the BaseClass.offset fields.
* Recursive in order to account for the size of the interface classes, if they are
* more than just interfaces.
* Params:
* cd = interface to look at
* baseOffset = offset of where cd will be placed
* Returns:
* subset of instantiated size used by cd for interfaces
*/
uint membersPlace(ClassDeclaration cd, uint baseOffset)
{
//printf(" membersPlace(%s, %d)\n", cd.toChars(), baseOffset);
uint offset = baseOffset;
foreach (BaseClass* b; cd.interfaces)
{
if (b.sym.sizeok != Sizeok.done)
b.sym.finalizeSize();
assert(b.sym.sizeok == Sizeok.done);
if (!b.sym.alignsize)
b.sym.alignsize = target.ptrsize;
offset = alignmember(structalign_t(cast(ushort)b.sym.alignsize), b.sym.alignsize, offset);
assert(bi < vtblInterfaces.length);
BaseClass* bv = (*vtblInterfaces)[bi];
if (b.sym.interfaces.length == 0)
{
//printf("\tvtblInterfaces[%d] b=%p b.sym = %s, offset = %d\n", bi, bv, bv.sym.toChars(), offset);
bv.offset = offset;
++bi;
// All the base interfaces down the left side share the same offset
for (BaseClass* b2 = bv; b2.baseInterfaces.length; )
{
b2 = &b2.baseInterfaces[0];
b2.offset = offset;
//printf("\tvtblInterfaces[%d] b=%p sym = %s, offset = %d\n", bi, b2, b2.sym.toChars(), b2.offset);
}
}
membersPlace(b.sym, offset);
//printf(" %s size = %d\n", b.sym.toChars(), b.sym.structsize);
offset += b.sym.structsize;
if (alignsize < b.sym.alignsize)
alignsize = b.sym.alignsize;
}
return offset - baseOffset;
}
structsize += membersPlace(this, structsize);
if (isInterfaceDeclaration())
{
sizeok = Sizeok.done;
return;
}
// FIXME: Currently setFieldOffset functions need to increase fields
// to calculate each variable offsets. It can be improved later.
fields.setDim(0);
FieldState fieldState;
fieldState.offset = structsize;
foreach (s; *members)
{
s.setFieldOffset(this, &fieldState, false);
}
sizeok = Sizeok.done;
// Calculate fields[i].overlapped
checkOverlappedFields();
}
/**************
* Returns: true if there's a __monitor field
*/
final bool hasMonitor()
{
return classKind == ClassKind.d;
}
/****************
* Find virtual function matching identifier and type.
* Used to build virtual function tables for interface implementations.
* Params:
* ident = function's identifier
* tf = function's type
* Returns:
* function symbol if found, null if not
* Errors:
* prints error message if more than one match
*/
extern (D) final FuncDeclaration findFunc(Identifier ident, TypeFunction tf)
{
//printf("ClassDeclaration.findFunc(%s, %s) %s\n", ident.toChars(), tf.toChars(), toChars());
FuncDeclaration fdmatch = null;
FuncDeclaration fdambig = null;
void updateBestMatch(FuncDeclaration fd)
{
fdmatch = fd;
fdambig = null;
//printf("Lfd fdmatch = %s %s [%s]\n", fdmatch.toChars(), fdmatch.type.toChars(), fdmatch.loc.toChars());
}
void searchVtbl(ref Dsymbols vtbl)
{
import dmd.typesem : covariant;
bool seenInterfaceVirtual;
foreach (s; vtbl)
{
auto fd = s.isFuncDeclaration();
if (!fd)
continue;
// the first entry might be a ClassInfo
//printf("\t[%d] = %s\n", i, fd.toChars());
if (ident != fd.ident || fd.type.covariant(tf) != Covariant.yes)
{
//printf("\t\t%d\n", fd.type.covariant(tf));
continue;
}
//printf("fd.parent.isClassDeclaration() = %p\n", fd.parent.isClassDeclaration());
if (!fdmatch)
{
updateBestMatch(fd);
continue;
}
if (fd == fdmatch)
continue;
/* Functions overriding interface functions for extern(C++) with VC++
* are not in the normal vtbl, but in vtblFinal. If the implementation
* is again overridden in a child class, both would be found here.
* The function in the child class should override the function
* in the base class, which is done here, because searchVtbl is first
* called for the child class. Checking seenInterfaceVirtual makes
* sure, that the compared functions are not in the same vtbl.
*/
if (fd.interfaceVirtual &&
fd.interfaceVirtual is fdmatch.interfaceVirtual &&
!seenInterfaceVirtual &&
fdmatch.type.covariant(fd.type) == Covariant.yes)
{
seenInterfaceVirtual = true;
continue;
}
{
// Function type matching: exact > covariant
MATCH m1 = tf.equals(fd.type) ? MATCH.exact : MATCH.nomatch;
MATCH m2 = tf.equals(fdmatch.type) ? MATCH.exact : MATCH.nomatch;
if (m1 > m2)
{
updateBestMatch(fd);
continue;
}
else if (m1 < m2)
continue;
}
{
MATCH m1 = (tf.mod == fd.type.mod) ? MATCH.exact : MATCH.nomatch;
MATCH m2 = (tf.mod == fdmatch.type.mod) ? MATCH.exact : MATCH.nomatch;
if (m1 > m2)
{
updateBestMatch(fd);
continue;
}
else if (m1 < m2)
continue;
}
{
// The way of definition: non-mixin > mixin
MATCH m1 = fd.parent.isClassDeclaration() ? MATCH.exact : MATCH.nomatch;
MATCH m2 = fdmatch.parent.isClassDeclaration() ? MATCH.exact : MATCH.nomatch;
if (m1 > m2)
{
updateBestMatch(fd);
continue;
}
else if (m1 < m2)
continue;
}
fdambig = fd;
//printf("Lambig fdambig = %s %s [%s]\n", fdambig.toChars(), fdambig.type.toChars(), fdambig.loc.toChars());
}
}
searchVtbl(vtbl);
for (auto cd = this; cd; cd = cd.baseClass)
{
searchVtbl(cd.vtblFinal);
}
if (fdambig)
classError("%s `%s` ambiguous virtual function `%s`", fdambig.toChars());
return fdmatch;
}
/****************************************
*/
final bool isCOMclass() const
{
return com;
}
bool isCOMinterface() const
{
return false;
}
final bool isCPPclass() const
{
return classKind == ClassKind.cpp;
}
bool isCPPinterface() const
{
return false;
}
/****************************************
*/
final bool isAbstract()
{
enum log = false;
if (isabstract != ThreeState.none)
return isabstract == ThreeState.yes;
if (log) printf("isAbstract(%s)\n", toChars());
bool no() { if (log) printf("no\n"); isabstract = ThreeState.no; return false; }
bool yes() { if (log) printf("yes\n"); isabstract = ThreeState.yes; return true; }
if (storage_class & STC.abstract_ || _scope && _scope.stc & STC.abstract_)
return yes();
if (errors)
return no();
/* https://issues.dlang.org/show_bug.cgi?id=11169
* Resolve forward references to all class member functions,
* and determine whether this class is abstract.
*/
static int func(Dsymbol s, void*)
{
auto fd = s.isFuncDeclaration();
if (!fd)
return 0;
if (fd.storage_class & STC.static_)
return 0;
if (fd.isAbstract())
return 1;
return 0;
}
// opaque class is not abstract if it is not declared abstract
if (!members)
return no();
for (size_t i = 0; i < members.length; i++)
{
auto s = (*members)[i];
if (s.apply(&func, null))
{
return yes();
}
}
/* If the base class is not abstract, then this class cannot
* be abstract.
*/
if (!isInterfaceDeclaration() && (!baseClass || !baseClass.isAbstract()))
return no();
/* If any abstract functions are inherited, but not overridden,
* then the class is abstract. Do this by checking the vtbl[].
* Need to do semantic() on class to fill the vtbl[].
*/
this.dsymbolSemantic(null);
/* The next line should work, but does not because when ClassDeclaration.dsymbolSemantic()
* is called recursively it can set PASS.semanticdone without finishing it.
*/
//if (semanticRun < PASS.semanticdone)
{
/* Could not complete semantic(). Try running semantic() on
* each of the virtual functions,
* which will fill in the vtbl[] overrides.
*/
static int virtualSemantic(Dsymbol s, void*)
{
auto fd = s.isFuncDeclaration();
if (fd && !(fd.storage_class & STC.static_) && !fd.isUnitTestDeclaration())
fd.dsymbolSemantic(null);
return 0;
}
for (size_t i = 0; i < members.length; i++)
{
auto s = (*members)[i];
s.apply(&virtualSemantic,null);
}
}
/* Finally, check the vtbl[]
*/
foreach (i; 1 .. vtbl.length)
{
auto fd = vtbl[i].isFuncDeclaration();
//if (fd) printf("\tvtbl[%d] = [%s] %s\n", i, fd.loc.toChars(), fd.toPrettyChars());
if (!fd || fd.isAbstract())
{
return yes();
}
}
return no();
}
/****************************************
* Determine if slot 0 of the vtbl[] is reserved for something else.
* For class objects, yes, this is where the classinfo ptr goes.
* For COM interfaces, no.
* For non-COM interfaces, yes, this is where the Interface ptr goes.
* Returns:
* 0 vtbl[0] is first virtual function pointer
* 1 vtbl[0] is classinfo/interfaceinfo pointer
*/
int vtblOffset() const
{
return classKind == ClassKind.cpp ? 0 : 1;
}
/****************************************
*/
override const(char)* kind() const
{
return "class";
}
/****************************************
*/
override final void addObjcSymbols(ClassDeclarations* classes, ClassDeclarations* categories)
{
.objc.addSymbols(this, classes, categories);
}
version (IN_LLVM) { /* not needed */ } else
{
// Back end
Dsymbol vtblsym;
}
extern (D) final bool isErrorException()
{
return errorException && (this == errorException || errorException.isBaseOf(this, null));
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class InterfaceDeclaration : ClassDeclaration
{
extern (D) this(Loc loc, Identifier id, BaseClasses* baseclasses)
{
super(loc, id, baseclasses, null, false);
this.dsym = DSYM.interfaceDeclaration;
if (id == Id.IUnknown) // IUnknown is the root of all COM interfaces
{
com = true;
classKind = ClassKind.cpp; // IUnknown is also a C++ interface
}
}
override InterfaceDeclaration syntaxCopy(Dsymbol s)
{
InterfaceDeclaration id =
s ? cast(InterfaceDeclaration)s
: new InterfaceDeclaration(loc, ident, null);
ClassDeclaration.syntaxCopy(id);
return id;
}
override Scope* newScope(Scope* sc)
{
auto sc2 = super.newScope(sc);
if (com)
sc2.linkage = LINK.windows;
else if (classKind == ClassKind.cpp)
sc2.linkage = LINK.cpp;
else if (classKind == ClassKind.objc)
sc2.linkage = LINK.objc;
return sc2;
}
/*******************************************
* Determine if 'this' is a base class of cd.
* (Actually, if it is an interface supported by cd)
* Output:
* *poffset offset to start of class
* OFFSET_RUNTIME must determine offset at runtime
* Returns:
* false not a base
* true is a base
*/
override bool isBaseOf(ClassDeclaration cd, int* poffset) pure nothrow @nogc
{
//printf("%s.InterfaceDeclaration.isBaseOf(cd = '%s')\n", toChars(), cd.toChars());
assert(!baseClass);
foreach (b; cd.interfaces)
{
//printf("\tX base %s\n", b.sym.toChars());
if (this == b.sym)
{
//printf("\tfound at offset %d\n", b.offset);
if (poffset)
{
// don't return incorrect offsets
// https://issues.dlang.org/show_bug.cgi?id=16980
*poffset = cd.sizeok == Sizeok.done ? b.offset : OFFSET_FWDREF;
}
// printf("\tfound at offset %d\n", b.offset);
return true;
}
if (baseClassImplementsInterface(this, b, poffset))
return true;
}
if (cd.baseClass && isBaseOf(cd.baseClass, poffset))
return true;
if (poffset)
*poffset = 0;
return false;
}
/*******************************************
*/
override const(char)* kind() const
{
return "interface";
}
/****************************************
* Determine if slot 0 of the vtbl[] is reserved for something else.
* For class objects, yes, this is where the ClassInfo ptr goes.
* For COM interfaces, no.
* For non-COM interfaces, yes, this is where the Interface ptr goes.
*/
override int vtblOffset() const
{
if (isCOMinterface() || isCPPinterface())