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/**
* Define `enum` declarations and `enum` members.
*
* Specification: $(LINK2 https://dlang.org/spec/enum.html, Enums)
*
* Copyright: Copyright (C) 1999-2024 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/src/dmd/denum.d, _denum.d)
* Documentation: https://dlang.org/phobos/dmd_denum.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/denum.d
* References: https://dlang.org/spec/enum.html
*/
module dmd.denum;
import core.stdc.stdio;
import dmd.astenums;
import dmd.attrib;
import dmd.gluelayer;
import dmd.declaration;
import dmd.dsymbol;
import dmd.expression;
import dmd.id;
import dmd.identifier;
import dmd.init;
import dmd.location;
import dmd.mtype;
import dmd.visitor;
/***********************************************************
* AST node for `EnumDeclaration`
* https://dlang.org/spec/enum.html#EnumDeclaration
*/
extern (C++) final class EnumDeclaration : ScopeDsymbol
{
/* The separate, and distinct, cases are:
* 1. enum { ... }
* 2. enum : memtype { ... }
* 3. enum id { ... }
* 4. enum id : memtype { ... }
* 5. enum id : memtype;
* 6. enum id;
*/
Type type; // the TypeEnum
Type memtype; // type of the members
Visibility visibility;
Expression maxval;
Expression minval;
Expression defaultval; // default initializer
// `bool` fields that are compacted into bit fields in a string mixin
private extern (D) static struct BitFields
{
bool isdeprecated;
bool added;
bool inuse;
}
import dmd.common.bitfields : generateBitFields;
mixin(generateBitFields!(BitFields, ubyte));
Symbol* sinit;
extern (D) this(const ref Loc loc, Identifier ident, Type memtype)
{
super(loc, ident);
//printf("EnumDeclaration() %p %s : %s\n", this, toChars(), memtype.toChars());
type = new TypeEnum(this);
this.memtype = memtype;
visibility = Visibility(Visibility.Kind.undefined);
}
override EnumDeclaration syntaxCopy(Dsymbol s)
{
assert(!s);
auto ed = new EnumDeclaration(loc, ident, memtype ? memtype.syntaxCopy() : null);
ScopeDsymbol.syntaxCopy(ed);
return ed;
}
override bool oneMember(out Dsymbol ps, Identifier ident)
{
if (isAnonymous())
return Dsymbol.oneMembers(members, ps, ident);
return Dsymbol.oneMember(ps, ident);
}
override Type getType()
{
return type;
}
override const(char)* kind() const
{
return "enum";
}
// is Dsymbol deprecated?
override bool isDeprecated() const
{
return isdeprecated;
}
override Visibility visible() pure nothrow @nogc @safe
{
return visibility;
}
/****************
* Determine if enum is a special one.
* Returns:
* `true` if special
*/
bool isSpecial() const nothrow @nogc
{
return isSpecialEnumIdent(ident) && memtype;
}
override inout(EnumDeclaration) isEnumDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
* AST node representing a member of an enum.
* https://dlang.org/spec/enum.html#EnumMember
* https://dlang.org/spec/enum.html#AnonymousEnumMember
*/
extern (C++) final class EnumMember : VarDeclaration
{
/* Can take the following forms:
* 1. id
* 2. id = value
* 3. type id = value
*/
@property ref value() { return (cast(ExpInitializer)_init).exp; }
// A cast() is injected to 'value' after dsymbolSemantic(),
// but 'origValue' will preserve the original value,
// or previous value + 1 if none was specified.
Expression origValue;
Type origType;
EnumDeclaration ed;
extern (D) this(const ref Loc loc, Identifier id, Expression value, Type origType)
{
super(loc, null, id ? id : Id.empty, new ExpInitializer(loc, value));
this.origValue = value;
this.origType = origType;
}
extern(D) this(Loc loc, Identifier id, Expression value, Type memtype,
StorageClass stc, UserAttributeDeclaration uad, DeprecatedDeclaration dd)
{
this(loc, id, value, memtype);
storage_class = stc;
userAttribDecl = uad;
depdecl = dd;
}
override EnumMember syntaxCopy(Dsymbol s)
{
assert(!s);
return new EnumMember(
loc, ident,
value ? value.syntaxCopy() : null,
origType ? origType.syntaxCopy() : null,
storage_class,
userAttribDecl ? userAttribDecl.syntaxCopy(s) : null,
depdecl ? depdecl.syntaxCopy(s) : null);
}
override const(char)* kind() const
{
return "enum member";
}
override inout(EnumMember) isEnumMember() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/******************************************
* Check for special enum names.
*
* Special enum names are used by the C++ name mangler to represent
* C++ types that are not basic D types.
* Params:
* ident = identifier to check for specialness
* Returns:
* `true` if it is special
*/
bool isSpecialEnumIdent(const Identifier ident) @nogc nothrow
{
return ident == Id.__c_long ||
ident == Id.__c_ulong ||
ident == Id.__c_longlong ||
ident == Id.__c_ulonglong ||
ident == Id.__c_long_double ||
ident == Id.__c_wchar_t ||
ident == Id.__c_complex_float ||
ident == Id.__c_complex_double ||
ident == Id.__c_complex_real;
}
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