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denum.d
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/**
* Define `enum` declarations and `enum` members.
*
* Specification: $(LINK2 https://dlang.org/spec/enum.html, Enums)
*
* Copyright: Copyright (C) 1999-2021 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* License: $(LINK2 http://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.attrib;
import dmd.gluelayer;
import dmd.declaration;
import dmd.dscope;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.expression;
import dmd.expressionsem;
import dmd.globals;
import dmd.id;
import dmd.identifier;
import dmd.init;
import dmd.mtype;
import dmd.tokens;
import dmd.typesem;
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 isdeprecated;
bool added;
int inuse;
extern (D) this(const ref Loc loc, Identifier ident, Type memtype)
{
super(loc, ident);
//printf("EnumDeclaration() %s\n", 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 void addMember(Scope* sc, ScopeDsymbol sds)
{
version (none)
{
printf("EnumDeclaration::addMember() %s\n", toChars());
for (size_t i = 0; i < members.dim; i++)
{
EnumMember em = (*members)[i].isEnumMember();
printf(" member %s\n", em.toChars());
}
}
/* Anonymous enum members get added to enclosing scope.
*/
ScopeDsymbol scopesym = isAnonymous() ? sds : this;
if (!isAnonymous())
{
ScopeDsymbol.addMember(sc, sds);
if (!symtab)
symtab = new DsymbolTable();
}
if (members)
{
for (size_t i = 0; i < members.dim; i++)
{
EnumMember em = (*members)[i].isEnumMember();
em.ed = this;
//printf("add %s to scope %s\n", em.toChars(), scopesym.toChars());
em.addMember(sc, isAnonymous() ? scopesym : this);
}
}
added = true;
}
override void setScope(Scope* sc)
{
if (semanticRun > PASS.init)
return;
ScopeDsymbol.setScope(sc);
}
override bool oneMember(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";
}
override Dsymbol search(const ref Loc loc, Identifier ident, int flags = SearchLocalsOnly)
{
//printf("%s.EnumDeclaration::search('%s')\n", toChars(), ident.toChars());
if (_scope)
{
// Try one last time to resolve this enum
dsymbolSemantic(this, _scope);
}
Dsymbol s = ScopeDsymbol.search(loc, ident, flags);
return s;
}
// is Dsymbol deprecated?
override bool isDeprecated() const
{
return isdeprecated;
}
override Visibility visible() pure nothrow @nogc @safe
{
return visibility;
}
/******************************
* Get the value of the .max/.min property as an Expression.
* Lazily computes the value and caches it in maxval/minval.
* Reports any errors.
* Params:
* loc = location to use for error messages
* id = Id::max or Id::min
* Returns:
* corresponding value of .max/.min
*/
Expression getMaxMinValue(const ref Loc loc, Identifier id)
{
//printf("EnumDeclaration::getMaxValue()\n");
static Expression pvalToResult(Expression e, const ref Loc loc)
{
if (e.op != TOK.error)
{
e = e.copy();
e.loc = loc;
}
return e;
}
Expression* pval = (id == Id.max) ? &maxval : &minval;
Expression errorReturn()
{
*pval = ErrorExp.get();
return *pval;
}
if (inuse)
{
error(loc, "recursive definition of `.%s` property", id.toChars());
return errorReturn();
}
if (*pval)
return pvalToResult(*pval, loc);
if (_scope)
dsymbolSemantic(this, _scope);
if (errors)
return errorReturn();
if (!members)
{
if (isSpecial())
{
/* Allow these special enums to not need a member list
*/
return memtype.getProperty(_scope, loc, id, 0);
}
error(loc, "is opaque and has no `.%s`", id.toChars());
return errorReturn();
}
if (!(memtype && memtype.isintegral()))
{
error(loc, "has no `.%s` property because base type `%s` is not an integral type", id.toChars(), memtype ? memtype.toChars() : "");
return errorReturn();
}
bool first = true;
for (size_t i = 0; i < members.dim; i++)
{
EnumMember em = (*members)[i].isEnumMember();
if (!em)
continue;
if (em.errors)
{
errors = true;
continue;
}
if (em.semanticRun < PASS.semanticdone)
{
em.error("is forward referenced looking for `.%s`", id.toChars());
errors = true;
continue;
}
if (first)
{
*pval = em.value;
first = false;
}
else
{
/* In order to work successfully with UDTs,
* build expressions to do the comparisons,
* and let the semantic analyzer and constant
* folder give us the result.
*/
/* Compute:
* if (e > maxval)
* maxval = e;
*/
Expression e = em.value;
Expression ec = new CmpExp(id == Id.max ? TOK.greaterThan : TOK.lessThan, em.loc, e, *pval);
inuse++;
ec = ec.expressionSemantic(em._scope);
inuse--;
ec = ec.ctfeInterpret();
if (ec.op == TOK.error)
{
errors = true;
continue;
}
if (ec.toInteger())
*pval = e;
}
}
return errors ? errorReturn() : pvalToResult(*pval, loc);
}
/****************
* Determine if enum is a special one.
* Returns:
* `true` if special
*/
bool isSpecial() const nothrow @nogc
{
return isSpecialEnumIdent(ident) && memtype;
}
Expression getDefaultValue(const ref Loc loc)
{
Expression handleErrors(){
defaultval = ErrorExp.get();
return defaultval;
}
//printf("EnumDeclaration::getDefaultValue() %p %s\n", this, toChars());
if (defaultval)
return defaultval;
if (_scope)
dsymbolSemantic(this, _scope);
if (errors)
return handleErrors();
if (!members)
{
if (isSpecial())
{
/* Allow these special enums to not need a member list
*/
return defaultval = memtype.defaultInit(loc);
}
error(loc, "is opaque and has no default initializer");
return handleErrors();
}
foreach (const i; 0 .. members.dim)
{
EnumMember em = (*members)[i].isEnumMember();
if (em)
{
if (em.semanticRun < PASS.semanticdone)
{
error(loc, "forward reference of `%s.init`", toChars());
return handleErrors();
}
defaultval = em.value;
return defaultval;
}
}
return handleErrors();
}
Type getMemtype(const ref Loc loc)
{
if (_scope)
{
/* Enum is forward referenced. We don't need to resolve the whole thing,
* just the base type
*/
if (memtype)
{
Loc locx = loc.isValid() ? loc : this.loc;
memtype = memtype.typeSemantic(locx, _scope);
}
else
{
// Run semantic to get the type from a possible first member value
dsymbolSemantic(this, _scope);
}
}
if (!memtype)
{
if (!isAnonymous() && (members || semanticRun >= PASS.semanticdone))
memtype = Type.tint32;
else
{
Loc locx = loc.isValid() ? loc : this.loc;
error(locx, "is forward referenced looking for base type");
return Type.terror;
}
}
return memtype;
}
override inout(EnumDeclaration) isEnumDeclaration() inout
{
return this;
}
Symbol* sinit;
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";
}
Expression getVarExp(const ref Loc loc, Scope* sc)
{
dsymbolSemantic(this, sc);
if (errors)
return ErrorExp.get();
checkDisabled(loc, sc);
if (depdecl && !depdecl._scope)
depdecl._scope = sc;
checkDeprecated(loc, sc);
if (errors)
return ErrorExp.get();
Expression e = new VarExp(loc, this);
return e.expressionSemantic(sc);
}
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;
}