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declaration.d
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declaration.d
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/**
* Miscellaneous declarations, including typedef, alias, variable declarations including the
* implicit this declaration, type tuples, ClassInfo, ModuleInfo and various TypeInfos.
*
* Copyright: Copyright (C) 1999-2020 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/declaration.d, _declaration.d)
* Documentation: https://dlang.org/phobos/dmd_declaration.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/declaration.d
*/
module dmd.declaration;
import core.stdc.stdio;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.ctorflow;
import dmd.dclass;
import dmd.delegatize;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.expression;
import dmd.func;
import dmd.globals;
import dmd.id;
import dmd.identifier;
import dmd.init;
import dmd.initsem;
import dmd.intrange;
import dmd.mtype;
import dmd.root.outbuffer;
import dmd.root.rootobject;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
/************************************
* Check to see the aggregate type is nested and its context pointer is
* accessible from the current scope.
* Returns true if error occurs.
*/
bool checkFrameAccess(Loc loc, Scope* sc, AggregateDeclaration ad, size_t iStart = 0)
{
Dsymbol sparent = ad.toParentLocal();
Dsymbol sparent2 = ad.toParent2();
Dsymbol s = sc.func;
if (ad.isNested() && s)
{
//printf("ad = %p %s [%s], parent:%p\n", ad, ad.toChars(), ad.loc.toChars(), ad.parent);
//printf("sparent = %p %s [%s], parent: %s\n", sparent, sparent.toChars(), sparent.loc.toChars(), sparent.parent,toChars());
//printf("sparent2 = %p %s [%s], parent: %s\n", sparent2, sparent2.toChars(), sparent2.loc.toChars(), sparent2.parent,toChars());
if (!ensureStaticLinkTo(s, sparent) || sparent != sparent2 && !ensureStaticLinkTo(s, sparent2))
{
error(loc, "cannot access frame pointer of `%s`", ad.toPrettyChars());
return true;
}
}
bool result = false;
for (size_t i = iStart; i < ad.fields.dim; i++)
{
VarDeclaration vd = ad.fields[i];
Type tb = vd.type.baseElemOf();
if (tb.ty == Tstruct)
{
result |= checkFrameAccess(loc, sc, (cast(TypeStruct)tb).sym);
}
}
return result;
}
/***********************************************
* Mark variable v as modified if it is inside a constructor that var
* is a field in.
*/
bool modifyFieldVar(Loc loc, Scope* sc, VarDeclaration var, Expression e1)
{
//printf("modifyFieldVar(var = %s)\n", var.toChars());
Dsymbol s = sc.func;
while (1)
{
FuncDeclaration fd = null;
if (s)
fd = s.isFuncDeclaration();
if (fd &&
((fd.isCtorDeclaration() && var.isField()) ||
(fd.isStaticCtorDeclaration() && !var.isField())) &&
fd.toParentDecl() == var.toParent2() &&
(!e1 || e1.op == TOK.this_))
{
bool result = true;
var.ctorinit = true;
//printf("setting ctorinit\n");
if (var.isField() && sc.ctorflow.fieldinit.length && !sc.intypeof)
{
assert(e1);
auto mustInit = ((var.storage_class & STC.nodefaultctor) != 0 ||
var.type.needsNested());
const dim = sc.ctorflow.fieldinit.length;
auto ad = fd.isMemberDecl();
assert(ad);
size_t i;
for (i = 0; i < dim; i++) // same as findFieldIndexByName in ctfeexp.c ?
{
if (ad.fields[i] == var)
break;
}
assert(i < dim);
auto fieldInit = &sc.ctorflow.fieldinit[i];
const fi = fieldInit.csx;
if (fi & CSX.this_ctor)
{
if (var.type.isMutable() && e1.type.isMutable())
result = false;
else
{
const(char)* modStr = !var.type.isMutable() ? MODtoChars(var.type.mod) : MODtoChars(e1.type.mod);
.error(loc, "%s field `%s` initialized multiple times", modStr, var.toChars());
.errorSupplemental(fieldInit.loc, "Previous initialization is here.");
}
}
else if (sc.inLoop || (fi & CSX.label))
{
if (!mustInit && var.type.isMutable() && e1.type.isMutable())
result = false;
else
{
const(char)* modStr = !var.type.isMutable() ? MODtoChars(var.type.mod) : MODtoChars(e1.type.mod);
.error(loc, "%s field `%s` initialization is not allowed in loops or after labels", modStr, var.toChars());
}
}
fieldInit.csx |= CSX.this_ctor;
fieldInit.loc = e1.loc;
if (var.overlapped) // https://issues.dlang.org/show_bug.cgi?id=15258
{
foreach (j, v; ad.fields)
{
if (v is var || !var.isOverlappedWith(v))
continue;
v.ctorinit = true;
sc.ctorflow.fieldinit[j].csx = CSX.this_ctor;
}
}
}
else if (fd != sc.func)
{
if (var.type.isMutable())
result = false;
else if (sc.func.fes)
{
const(char)* p = var.isField() ? "field" : var.kind();
.error(loc, "%s %s `%s` initialization is not allowed in foreach loop",
MODtoChars(var.type.mod), p, var.toChars());
}
else
{
const(char)* p = var.isField() ? "field" : var.kind();
.error(loc, "%s %s `%s` initialization is not allowed in nested function `%s`",
MODtoChars(var.type.mod), p, var.toChars(), sc.func.toChars());
}
}
return result;
}
else
{
if (s)
{
s = s.toParentP(var.toParent2());
continue;
}
}
break;
}
return false;
}
/******************************************
*/
extern (C++) void ObjectNotFound(Identifier id)
{
error(Loc.initial, "`%s` not found. object.d may be incorrectly installed or corrupt.", id.toChars());
fatal();
}
enum STC : ulong
{
undefined_ = 0L,
static_ = (1L << 0),
extern_ = (1L << 1),
const_ = (1L << 2),
final_ = (1L << 3),
abstract_ = (1L << 4),
parameter = (1L << 5),
field = (1L << 6),
override_ = (1L << 7),
auto_ = (1L << 8),
synchronized_ = (1L << 9),
deprecated_ = (1L << 10),
in_ = (1L << 11), // in parameter
out_ = (1L << 12), // out parameter
lazy_ = (1L << 13), // lazy parameter
foreach_ = (1L << 14), // variable for foreach loop
//(1L << 15)
variadic = (1L << 16), // the 'variadic' parameter in: T foo(T a, U b, V variadic...)
ctorinit = (1L << 17), // can only be set inside constructor
templateparameter = (1L << 18), // template parameter
scope_ = (1L << 19),
immutable_ = (1L << 20),
ref_ = (1L << 21),
init = (1L << 22), // has explicit initializer
manifest = (1L << 23), // manifest constant
nodtor = (1L << 24), // don't run destructor
nothrow_ = (1L << 25), // never throws exceptions
pure_ = (1L << 26), // pure function
tls = (1L << 27), // thread local
alias_ = (1L << 28), // alias parameter
shared_ = (1L << 29), // accessible from multiple threads
gshared = (1L << 30), // accessible from multiple threads, but not typed as "shared"
wild = (1L << 31), // for "wild" type constructor
property = (1L << 32),
safe = (1L << 33),
trusted = (1L << 34),
system = (1L << 35),
ctfe = (1L << 36), // can be used in CTFE, even if it is static
disable = (1L << 37), // for functions that are not callable
result = (1L << 38), // for result variables passed to out contracts
nodefaultctor = (1L << 39), // must be set inside constructor
temp = (1L << 40), // temporary variable
rvalue = (1L << 41), // force rvalue for variables
nogc = (1L << 42), // @nogc
volatile_ = (1L << 43), // destined for volatile in the back end
return_ = (1L << 44), // 'return ref' or 'return scope' for function parameters
autoref = (1L << 45), // Mark for the already deduced 'auto ref' parameter
inference = (1L << 46), // do attribute inference
exptemp = (1L << 47), // temporary variable that has lifetime restricted to an expression
maybescope = (1L << 48), // parameter might be 'scope'
scopeinferred = (1L << 49), // 'scope' has been inferred and should not be part of mangling
future = (1L << 50), // introducing new base class function
local = (1L << 51), // do not forward (see dmd.dsymbol.ForwardingScopeDsymbol).
returninferred = (1L << 52), // 'return' has been inferred and should not be part of mangling
live = (1L << 53), // function @live attribute
// Group members are mutually exclusive (there can be only one)
safeGroup = STC.safe | STC.trusted | STC.system,
TYPECTOR = (STC.const_ | STC.immutable_ | STC.shared_ | STC.wild),
FUNCATTR = (STC.ref_ | STC.nothrow_ | STC.nogc | STC.pure_ | STC.property | STC.live |
STC.safeGroup),
}
enum STCStorageClass =
(STC.auto_ | STC.scope_ | STC.static_ | STC.extern_ | STC.const_ | STC.final_ | STC.abstract_ | STC.synchronized_ |
STC.deprecated_ | STC.future | STC.override_ | STC.lazy_ | STC.alias_ | STC.out_ | STC.in_ | STC.manifest |
STC.immutable_ | STC.shared_ | STC.wild | STC.nothrow_ | STC.nogc | STC.pure_ | STC.ref_ | STC.return_ | STC.tls | STC.gshared |
STC.property | STC.safeGroup | STC.disable | STC.local | STC.live);
/* These storage classes "flow through" to the inner scope of a Dsymbol
*/
enum STCFlowThruAggregate = STC.safeGroup; /// for an AggregateDeclaration
enum STCFlowThruFunction = ~(STC.auto_ | STC.scope_ | STC.static_ | STC.extern_ | STC.abstract_ | STC.deprecated_ | STC.override_ |
STC.TYPECTOR | STC.final_ | STC.tls | STC.gshared | STC.ref_ | STC.return_ | STC.property |
STC.nothrow_ | STC.pure_ | STC.safe | STC.trusted | STC.system); /// for a FuncDeclaration
/* Accumulator for successive matches.
*/
struct MatchAccumulator
{
int count; // number of matches found so far
MATCH last = MATCH.nomatch; // match level of lastf
FuncDeclaration lastf; // last matching function we found
FuncDeclaration nextf; // if ambiguous match, this is the "other" function
}
/***********************************************************
*/
extern (C++) abstract class Declaration : Dsymbol
{
Type type;
Type originalType; // before semantic analysis
StorageClass storage_class = STC.undefined_;
Prot protection;
LINK linkage = LINK.default_;
int inuse; // used to detect cycles
// overridden symbol with pragma(mangle, "...")
const(char)[] mangleOverride;
final extern (D) this(Identifier ident)
{
super(ident);
protection = Prot(Prot.Kind.undefined);
}
final extern (D) this(const ref Loc loc, Identifier ident)
{
super(loc, ident);
protection = Prot(Prot.Kind.undefined);
}
override const(char)* kind() const
{
return "declaration";
}
override final d_uns64 size(const ref Loc loc)
{
assert(type);
return type.size();
}
/**
* Issue an error if an attempt to call a disabled method is made
*
* If the declaration is disabled but inside a disabled function,
* returns `true` but do not issue an error message.
*
* Params:
* loc = Location information of the call
* sc = Scope in which the call occurs
* isAliasedDeclaration = if `true` searches overload set
*
* Returns:
* `true` if this `Declaration` is `@disable`d, `false` otherwise.
*/
extern (D) final bool checkDisabled(Loc loc, Scope* sc, bool isAliasedDeclaration = false)
{
if (storage_class & STC.disable)
{
if (!(sc.func && sc.func.storage_class & STC.disable))
{
auto p = toParent();
if (p && isPostBlitDeclaration())
p.error(loc, "is not copyable because it is annotated with `@disable`");
else
{
// if the function is @disabled, maybe there
// is an overload in the overload set that isn't
if (isAliasedDeclaration)
{
FuncDeclaration fd = isFuncDeclaration();
if (fd)
{
for (FuncDeclaration ovl = fd; ovl; ovl = cast(FuncDeclaration)ovl.overnext)
if (!(ovl.storage_class & STC.disable))
return false;
}
}
error(loc, "cannot be used because it is annotated with `@disable`");
}
}
return true;
}
return false;
}
/*************************************
* Check to see if declaration can be modified in this context (sc).
* Issue error if not.
* Params:
* loc = location for error messages
* e1 = `null` or `this` expression when this declaration is a field
* sc = context
* flag = !=0 means do not issue error message for invalid modification
* Returns:
* Modifiable.yes or Modifiable.initialization
*/
extern (D) final Modifiable checkModify(Loc loc, Scope* sc, Expression e1, int flag)
{
VarDeclaration v = isVarDeclaration();
if (v && v.canassign)
return Modifiable.initialization;
if (isParameter() || isResult())
{
for (Scope* scx = sc; scx; scx = scx.enclosing)
{
if (scx.func == parent && (scx.flags & SCOPE.contract))
{
const(char)* s = isParameter() && parent.ident != Id.ensure ? "parameter" : "result";
if (!flag)
error(loc, "cannot modify %s `%s` in contract", s, toChars());
return Modifiable.initialization; // do not report type related errors
}
}
}
if (e1 && e1.op == TOK.this_ && isField())
{
VarDeclaration vthis = (cast(ThisExp)e1).var;
for (Scope* scx = sc; scx; scx = scx.enclosing)
{
if (scx.func == vthis.parent && (scx.flags & SCOPE.contract))
{
if (!flag)
error(loc, "cannot modify parameter 'this' in contract");
return Modifiable.initialization; // do not report type related errors
}
}
}
if (v && (isCtorinit() || isField()))
{
// It's only modifiable if inside the right constructor
if ((storage_class & (STC.foreach_ | STC.ref_)) == (STC.foreach_ | STC.ref_))
return Modifiable.initialization;
return modifyFieldVar(loc, sc, v, e1)
? Modifiable.initialization : Modifiable.yes;
}
return Modifiable.yes;
}
override final Dsymbol search(const ref Loc loc, Identifier ident, int flags = SearchLocalsOnly)
{
Dsymbol s = Dsymbol.search(loc, ident, flags);
if (!s && type)
{
s = type.toDsymbol(_scope);
if (s)
s = s.search(loc, ident, flags);
}
return s;
}
final bool isStatic() const pure nothrow @nogc @safe
{
return (storage_class & STC.static_) != 0;
}
bool isDelete()
{
return false;
}
bool isDataseg()
{
return false;
}
bool isThreadlocal()
{
return false;
}
bool isCodeseg() const pure nothrow @nogc @safe
{
return false;
}
final bool isCtorinit() const pure nothrow @nogc @safe
{
return (storage_class & STC.ctorinit) != 0;
}
final bool isFinal() const pure nothrow @nogc @safe
{
return (storage_class & STC.final_) != 0;
}
bool isAbstract()
{
return (storage_class & STC.abstract_) != 0;
}
final bool isConst() const pure nothrow @nogc @safe
{
return (storage_class & STC.const_) != 0;
}
final bool isImmutable() const pure nothrow @nogc @safe
{
return (storage_class & STC.immutable_) != 0;
}
final bool isWild() const pure nothrow @nogc @safe
{
return (storage_class & STC.wild) != 0;
}
final bool isAuto() const pure nothrow @nogc @safe
{
return (storage_class & STC.auto_) != 0;
}
final bool isScope() const pure nothrow @nogc @safe
{
return (storage_class & STC.scope_) != 0;
}
final bool isSynchronized() const pure nothrow @nogc @safe
{
return (storage_class & STC.synchronized_) != 0;
}
final bool isParameter() const pure nothrow @nogc @safe
{
return (storage_class & STC.parameter) != 0;
}
override final bool isDeprecated() const pure nothrow @nogc @safe
{
return (storage_class & STC.deprecated_) != 0;
}
final bool isDisabled() const pure nothrow @nogc @safe
{
return (storage_class & STC.disable) != 0;
}
final bool isOverride() const pure nothrow @nogc @safe
{
return (storage_class & STC.override_) != 0;
}
final bool isResult() const pure nothrow @nogc @safe
{
return (storage_class & STC.result) != 0;
}
final bool isField() const pure nothrow @nogc @safe
{
return (storage_class & STC.field) != 0;
}
final bool isIn() const pure nothrow @nogc @safe
{
return (storage_class & STC.in_) != 0;
}
final bool isOut() const pure nothrow @nogc @safe
{
return (storage_class & STC.out_) != 0;
}
final bool isRef() const pure nothrow @nogc @safe
{
return (storage_class & STC.ref_) != 0;
}
final bool isFuture() const pure nothrow @nogc @safe
{
return (storage_class & STC.future) != 0;
}
override final Prot prot() pure nothrow @nogc @safe
{
return protection;
}
override final inout(Declaration) isDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class TupleDeclaration : Declaration
{
Objects* objects;
bool isexp; // true: expression tuple
TypeTuple tupletype; // !=null if this is a type tuple
extern (D) this(const ref Loc loc, Identifier ident, Objects* objects)
{
super(loc, ident);
this.objects = objects;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(0);
}
override const(char)* kind() const
{
return "tuple";
}
override Type getType()
{
/* If this tuple represents a type, return that type
*/
//printf("TupleDeclaration::getType() %s\n", toChars());
if (isexp)
return null;
if (!tupletype)
{
/* It's only a type tuple if all the Object's are types
*/
for (size_t i = 0; i < objects.dim; i++)
{
RootObject o = (*objects)[i];
if (o.dyncast() != DYNCAST.type)
{
//printf("\tnot[%d], %p, %d\n", i, o, o.dyncast());
return null;
}
}
/* We know it's a type tuple, so build the TypeTuple
*/
Types* types = cast(Types*)objects;
auto args = new Parameters(objects.dim);
OutBuffer buf;
int hasdeco = 1;
for (size_t i = 0; i < types.dim; i++)
{
Type t = (*types)[i];
//printf("type = %s\n", t.toChars());
version (none)
{
buf.printf("_%s_%d", ident.toChars(), i);
const len = buf.offset;
const name = buf.extractSlice().ptr;
auto id = Identifier.idPool(name, len);
auto arg = new Parameter(STC.in_, t, id, null);
}
else
{
auto arg = new Parameter(0, t, null, null, null);
}
(*args)[i] = arg;
if (!t.deco)
hasdeco = 0;
}
tupletype = new TypeTuple(args);
if (hasdeco)
return tupletype.typeSemantic(Loc.initial, null);
}
return tupletype;
}
override Dsymbol toAlias2()
{
//printf("TupleDeclaration::toAlias2() '%s' objects = %s\n", toChars(), objects.toChars());
for (size_t i = 0; i < objects.dim; i++)
{
RootObject o = (*objects)[i];
if (Dsymbol s = isDsymbol(o))
{
s = s.toAlias2();
(*objects)[i] = s;
}
}
return this;
}
override bool needThis()
{
//printf("TupleDeclaration::needThis(%s)\n", toChars());
for (size_t i = 0; i < objects.dim; i++)
{
RootObject o = (*objects)[i];
if (o.dyncast() == DYNCAST.expression)
{
Expression e = cast(Expression)o;
if (e.op == TOK.dSymbol)
{
DsymbolExp ve = cast(DsymbolExp)e;
Declaration d = ve.s.isDeclaration();
if (d && d.needThis())
{
return true;
}
}
}
}
return false;
}
override inout(TupleDeclaration) isTupleDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class AliasDeclaration : Declaration
{
Dsymbol aliassym;
Dsymbol overnext; // next in overload list
Dsymbol _import; // !=null if unresolved internal alias for selective import
bool wasTemplateParameter; /// indicates wether the alias was created to make a template parameter visible in the scope, i.e as a member.
extern (D) this(const ref Loc loc, Identifier ident, Type type)
{
super(loc, ident);
//printf("AliasDeclaration(id = '%s', type = %p)\n", id.toChars(), type);
//printf("type = '%s'\n", type.toChars());
this.type = type;
assert(type);
}
extern (D) this(const ref Loc loc, Identifier ident, Dsymbol s)
{
super(loc, ident);
//printf("AliasDeclaration(id = '%s', s = %p)\n", id.toChars(), s);
assert(s != this);
this.aliassym = s;
assert(s);
}
static AliasDeclaration create(Loc loc, Identifier id, Type type)
{
return new AliasDeclaration(loc, id, type);
}
override Dsymbol syntaxCopy(Dsymbol s)
{
//printf("AliasDeclaration::syntaxCopy()\n");
assert(!s);
AliasDeclaration sa = type ? new AliasDeclaration(loc, ident, type.syntaxCopy()) : new AliasDeclaration(loc, ident, aliassym.syntaxCopy(null));
sa.comment = comment;
sa.storage_class = storage_class;
return sa;
}
override bool overloadInsert(Dsymbol s)
{
//printf("[%s] AliasDeclaration::overloadInsert('%s') s = %s %s @ [%s]\n",
// loc.toChars(), toChars(), s.kind(), s.toChars(), s.loc.toChars());
/** Aliases aren't overloadable themselves, but if their Aliasee is
* overloadable they are converted to an overloadable Alias (either
* FuncAliasDeclaration or OverDeclaration).
*
* This is done by moving the Aliasee into such an overloadable alias
* which is then used to replace the existing Aliasee. The original
* Alias (_this_) remains a useless shell.
*
* This is a horrible mess. It was probably done to avoid replacing
* existing AST nodes and references, but it needs a major
* simplification b/c it's too complex to maintain.
*
* A simpler approach might be to merge any colliding symbols into a
* simple Overload class (an array) and then later have that resolve
* all collisions.
*/
if (semanticRun >= PASS.semanticdone)
{
/* Semantic analysis is already finished, and the aliased entity
* is not overloadable.
*/
if (type)
return false;
/* When s is added in member scope by static if, mixin("code") or others,
* aliassym is determined already. See the case in: test/compilable/test61.d
*/
auto sa = aliassym.toAlias();
if (auto fd = sa.isFuncDeclaration())
{
auto fa = new FuncAliasDeclaration(ident, fd);
fa.protection = protection;
fa.parent = parent;
aliassym = fa;
return aliassym.overloadInsert(s);
}
if (auto td = sa.isTemplateDeclaration())
{
auto od = new OverDeclaration(ident, td);
od.protection = protection;
od.parent = parent;
aliassym = od;
return aliassym.overloadInsert(s);
}
if (auto od = sa.isOverDeclaration())
{
if (sa.ident != ident || sa.parent != parent)
{
od = new OverDeclaration(ident, od);
od.protection = protection;
od.parent = parent;
aliassym = od;
}
return od.overloadInsert(s);
}
if (auto os = sa.isOverloadSet())
{
if (sa.ident != ident || sa.parent != parent)
{
os = new OverloadSet(ident, os);
// TODO: protection is lost here b/c OverloadSets have no protection attribute
// Might no be a practical issue, b/c the code below fails to resolve the overload anyhow.
// ----
// module os1;
// import a, b;
// private alias merged = foo; // private alias to overload set of a.foo and b.foo
// ----
// module os2;
// import a, b;
// public alias merged = bar; // public alias to overload set of a.bar and b.bar
// ----
// module bug;
// import os1, os2;
// void test() { merged(123); } // should only look at os2.merged
//
// os.protection = protection;
os.parent = parent;
aliassym = os;
}
os.push(s);
return true;
}
return false;
}
/* Don't know yet what the aliased symbol is, so assume it can
* be overloaded and check later for correctness.
*/
if (overnext)
return overnext.overloadInsert(s);
if (s is this)
return true;
overnext = s;
return true;
}
override const(char)* kind() const
{
return "alias";
}
override Type getType()
{
if (type)
return type;
return toAlias().getType();
}
override Dsymbol toAlias()
{
//printf("[%s] AliasDeclaration::toAlias('%s', this = %p, aliassym = %p, kind = '%s', inuse = %d)\n",
// loc.toChars(), toChars(), this, aliassym, aliassym ? aliassym.kind() : "", inuse);
assert(this != aliassym);
//static int count; if (++count == 10) *(char*)0=0;
if (inuse == 1 && type && _scope)
{
inuse = 2;
uint olderrors = global.errors;
Dsymbol s = type.toDsymbol(_scope);
//printf("[%s] type = %s, s = %p, this = %p\n", loc.toChars(), type.toChars(), s, this);
if (global.errors != olderrors)
goto Lerr;
if (s)
{
s = s.toAlias();
if (global.errors != olderrors)
goto Lerr;
aliassym = s;
inuse = 0;
}
else
{
Type t = type.typeSemantic(loc, _scope);
if (t.ty == Terror)
goto Lerr;
if (global.errors != olderrors)
goto Lerr;
//printf("t = %s\n", t.toChars());
inuse = 0;
}
}
if (inuse)
{
error("recursive alias declaration");
Lerr:
// Avoid breaking "recursive alias" state during errors gagged
if (global.gag)
return this;
aliassym = new AliasDeclaration(loc, ident, Type.terror);
type = Type.terror;
return aliassym;
}
if (semanticRun >= PASS.semanticdone)
{
// semantic is already done.
// Do not see aliassym !is null, because of lambda aliases.
// Do not see type.deco !is null, even so "alias T = const int;` needs
// semantic analysis to take the storage class `const` as type qualifier.
}
else
{
if (_import && _import._scope)
{
/* If this is an internal alias for selective/renamed import,
* load the module first.
*/
_import.dsymbolSemantic(null);
}
if (_scope)
{
aliasSemantic(this, _scope);
}
}
inuse = 1;
Dsymbol s = aliassym ? aliassym.toAlias() : this;
inuse = 0;
return s;
}
override Dsymbol toAlias2()
{
if (inuse)
{
error("recursive alias declaration");
return this;
}
inuse = 1;
Dsymbol s = aliassym ? aliassym.toAlias2() : this;
inuse = 0;
return s;
}
override bool isOverloadable() const
{
// assume overloadable until alias is resolved
return semanticRun < PASS.semanticdone ||
aliassym && aliassym.isOverloadable();
}
override inout(AliasDeclaration) isAliasDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class OverDeclaration : Declaration
{
Dsymbol overnext; // next in overload list
Dsymbol aliassym;
bool hasOverloads;
extern (D) this(Identifier ident, Dsymbol s, bool hasOverloads = true)
{
super(ident);
this.aliassym = s;
this.hasOverloads = hasOverloads;
if (hasOverloads)
{
if (OverDeclaration od = aliassym.isOverDeclaration())
this.hasOverloads = od.hasOverloads;
}
else
{
// for internal use
assert(!aliassym.isOverDeclaration());
}
}
override const(char)* kind() const
{
return "overload alias"; // todo
}
override bool equals(const RootObject o) const
{
if (this == o)
return true;
auto s = isDsymbol(o);
if (!s)
return false;