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denum.d
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denum.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1999-2018 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
*/
module dmd.denum;
import core.stdc.stdio;
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;
/***********************************************************
*/
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
Prot protection;
Expression maxval;
Expression minval;
Expression defaultval; // default initializer
bool isdeprecated;
bool added;
int inuse;
extern (D) this(const ref Loc loc, Identifier id, Type memtype)
{
super(id);
//printf("EnumDeclaration() %s\n", toChars());
this.loc = loc;
type = new TypeEnum(this);
this.memtype = memtype;
protection = Prot(Prot.Kind.undefined);
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
auto ed = new EnumDeclaration(loc, ident, memtype ? memtype.syntaxCopy() : null);
return ScopeDsymbol.syntaxCopy(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);
}
if (!members || !symtab || _scope)
{
error("is forward referenced when looking for `%s`", ident.toChars());
//*(char*)0=0;
return null;
}
Dsymbol s = ScopeDsymbol.search(loc, ident, flags);
return s;
}
// is Dsymbol deprecated?
override bool isDeprecated()
{
return isdeprecated;
}
override Prot prot()
{
return protection;
}
/******************************
* 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");
bool first = true;
Expression* pval = (id == Id.max) ? &maxval : &minval;
Expression errorReturn()
{
*pval = new ErrorExp();
return *pval;
}
if (inuse)
{
error(loc, "recursive definition of `.%s` property", id.toChars());
return errorReturn();
}
if (*pval)
goto Ldone;
if (_scope)
dsymbolSemantic(this, _scope);
if (errors)
return errorReturn();
if (semanticRun == PASS.init || !members)
{
if (isSpecial())
{
/* Allow these special enums to not need a member list
*/
return memtype.getProperty(loc, id, 0);
}
error("is forward referenced looking for `.%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();
}
for (size_t i = 0; i < members.dim; i++)
{
EnumMember em = (*members)[i].isEnumMember();
if (!em)
continue;
if (em.errors)
return errorReturn();
Expression e = em.value;
if (first)
{
*pval = e;
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 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.toInteger())
*pval = e;
}
}
Ldone:
Expression e = *pval;
if (e.op != TOK.error)
{
e = e.copy();
e.loc = loc;
}
return e;
}
/****************
* Determine if enum is a 'special' one.
* Returns:
* true if special
*/
final bool isSpecial() const nothrow @nogc
{
return (ident == Id.__c_long ||
ident == Id.__c_ulong ||
ident == Id.__c_longlong ||
ident == Id.__c_ulonglong ||
ident == Id.__c_long_double) && memtype;
}
Expression getDefaultValue(const ref Loc loc)
{
//printf("EnumDeclaration::getDefaultValue() %p %s\n", this, toChars());
if (defaultval)
return defaultval;
if (_scope)
dsymbolSemantic(this, _scope);
if (errors)
goto Lerrors;
if (semanticRun == PASS.init || !members)
{
if (isSpecial())
{
/* Allow these special enums to not need a member list
*/
return memtype.defaultInit(loc);
}
error(loc, "forward reference of `%s.init`", toChars());
goto Lerrors;
}
foreach (const i; 0 .. members.dim)
{
EnumMember em = (*members)[i].isEnumMember();
if (em)
{
defaultval = em.value;
return defaultval;
}
}
Lerrors:
defaultval = new ErrorExp();
return defaultval;
}
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
{
if (!isAnonymous() && members)
memtype = Type.tint32;
}
}
if (!memtype)
{
if (!isAnonymous() && members)
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);
}
}
/***********************************************************
*/
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;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new EnumMember(loc, ident, value ? value.syntaxCopy() : null, origType ? origType.syntaxCopy() : null);
}
override const(char)* kind() const
{
return "enum member";
}
Expression getVarExp(const ref Loc loc, Scope* sc)
{
dsymbolSemantic(this, sc);
if (errors)
return new ErrorExp();
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);
}
}