/
declaration.d
2222 lines (1966 loc) · 66.9 KB
/
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) 1999-2024 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/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.astenums;
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.gluelayer;
import dmd.id;
import dmd.identifier;
import dmd.init;
import dmd.initsem;
import dmd.intrange;
import dmd.location;
import dmd.mtype;
import dmd.common.outbuffer;
import dmd.rootobject;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
version (IN_GCC) {}
else version (IN_LLVM) {}
else version = MARS;
/************************************
* 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.length; 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.
* Also used to allow immutable globals to be initialized inside a static constructor.
* Returns:
* true if it's an initialization of v
*/
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() || fd.isCrtCtor) && !var.isField())) &&
fd.toParentDecl() == var.toParent2() &&
(!e1 || e1.op == EXP.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());
}
}
else if (fd.isStaticCtorDeclaration() && !fd.isSharedStaticCtorDeclaration() &&
var.type.isImmutable())
{
.error(loc, "%s %s `%s` initialization is not allowed in `static this`",
MODtoChars(var.type.mod), var.kind(), var.toChars());
errorSupplemental(loc, "Use `shared static this` instead.");
}
else if (fd.isStaticCtorDeclaration() && !fd.isSharedStaticCtorDeclaration() &&
var.type.isConst())
{
// @@@DEPRECATED_2.116@@@
// Turn this into an error, merging with the branch above
.deprecation(loc, "%s %s `%s` initialization is not allowed in `static this`",
MODtoChars(var.type.mod), var.kind(), var.toChars());
deprecationSupplemental(loc, "Use `shared static this` instead.");
}
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();
}
/* 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_;
Visibility visibility;
LINK _linkage = LINK.default_; // may be `LINK.system`; use `resolvedLinkage()` to resolve it
short inuse; // used to detect cycles
ubyte adFlags; // control re-assignment of AliasDeclaration (put here for packing reasons)
enum wasRead = 1; // set if AliasDeclaration was read
enum ignoreRead = 2; // ignore any reads of AliasDeclaration
enum nounderscore = 4; // don't prepend _ to mangled name
enum hidden = 8; // don't print this in .di files
// overridden symbol with pragma(mangle, "...")
const(char)[] mangleOverride;
final extern (D) this(Identifier ident) @safe
{
super(ident);
visibility = Visibility(Visibility.Kind.undefined);
}
final extern (D) this(const ref Loc loc, Identifier ident) @safe
{
super(loc, ident);
visibility = Visibility(Visibility.Kind.undefined);
}
override const(char)* kind() const
{
return "declaration";
}
override final uinteger_t size(const ref Loc loc)
{
assert(type);
const sz = type.size();
if (sz == SIZE_INVALID)
errors = true;
return sz;
}
/**
* 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))
return false;
if (sc.func && sc.func.storage_class & STC.disable)
return true;
if (auto p = toParent())
{
if (auto postblit = isPostBlitDeclaration())
{
/* https://issues.dlang.org/show_bug.cgi?id=21885
*
* If the generated postblit is disabled, it
* means that one of the fields has a disabled
* postblit. Print the first field that has
* a disabled postblit.
*/
if (postblit.isGenerated())
{
auto sd = p.isStructDeclaration();
assert(sd);
for (size_t i = 0; i < sd.fields.length; i++)
{
auto structField = sd.fields[i];
if (structField.overlapped)
continue;
Type tv = structField.type.baseElemOf();
if (tv.ty != Tstruct)
continue;
auto sdv = (cast(TypeStruct)tv).sym;
if (!sdv.postblit)
continue;
if (sdv.postblit.isDisabled())
{
.error(loc, "%s `%s` is not copyable because field `%s` is not copyable", p.kind, p.toPrettyChars, structField.toChars());
return true;
}
}
}
.error(loc, "%s `%s` is not copyable because it has a disabled postblit", p.kind, p.toPrettyChars);
return true;
}
}
// 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;
}
}
if (auto ctor = isCtorDeclaration())
{
if (ctor.isCpCtor && ctor.isGenerated())
{
.error(loc, "generating an `inout` copy constructor for `struct %s` failed, therefore instances of it are uncopyable", parent.toPrettyChars());
return true;
}
}
.error(loc, "%s `%s` cannot be used because it is annotated with `@disable`", kind, toPrettyChars);
return true;
}
/*************************************
* 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 = if the first bit is set it means do not issue error message for
* invalid modification; if the second bit is set, it means that
this declaration is a field and a subfield of it is modified.
* Returns:
* Modifiable.yes or Modifiable.initialization
*/
extern (D) final Modifiable checkModify(Loc loc, Scope* sc, Expression e1, ModifyFlags 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 & ModifyFlags.noError))
error(loc, "%s `%s` cannot modify %s `%s` in contract", kind, toPrettyChars, s, toChars());
return Modifiable.initialization; // do not report type related errors
}
}
}
if (e1 && e1.op == EXP.this_ && isField())
{
VarDeclaration vthis = e1.isThisExp().var;
for (Scope* scx = sc; scx; scx = scx.enclosing)
{
if (scx.func == vthis.parent && (scx.flags & SCOPE.contract))
{
if (!(flag & ModifyFlags.noError))
error(loc, "%s `%s` cannot modify parameter `this` in contract", kind, toPrettyChars);
return Modifiable.initialization; // do not report type related errors
}
}
}
if (v && (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;
if (flag & ModifyFlags.fieldAssign)
return Modifiable.yes;
return modifyFieldVar(loc, sc, v, e1) ? Modifiable.initialization : Modifiable.yes;
}
return Modifiable.yes;
}
final bool isStatic() const pure nothrow @nogc @safe
{
return (storage_class & STC.static_) != 0;
}
/// Returns the linkage, resolving the target-specific `System` one.
final LINK resolvedLinkage() const
{
return _linkage == LINK.system ? target.systemLinkage() : _linkage;
}
bool isDelete()
{
return false;
}
bool isDataseg()
{
return false;
}
bool isThreadlocal()
{
return false;
}
bool isCodeseg() const pure nothrow @nogc @safe
{
return false;
}
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 isReturn() const pure nothrow @nogc @safe
{
return (storage_class & STC.return_) != 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;
}
/// Returns: Whether the variable is a reference, annotated with `out` or `ref`
final bool isReference() const pure nothrow @nogc @safe
{
return (storage_class & (STC.ref_ | STC.out_)) != 0;
}
final bool isFuture() const pure nothrow @nogc @safe
{
return (storage_class & STC.future) != 0;
}
final extern(D) bool isSystem() const pure nothrow @nogc @safe
{
return (storage_class & STC.system) != 0;
}
override final Visibility visible() pure nothrow @nogc @safe
{
return visibility;
}
override final inout(Declaration) isDeclaration() inout pure nothrow @nogc @safe
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class TupleDeclaration : Declaration
{
Objects* objects;
TypeTuple tupletype; // !=null if this is a type tuple
bool isexp; // true: expression tuple
bool building; // it's growing in AliasAssign semantic
extern (D) this(const ref Loc loc, Identifier ident, Objects* objects) @safe
{
super(loc, ident);
this.objects = objects;
}
override TupleDeclaration syntaxCopy(Dsymbol s)
{
assert(0);
}
override const(char)* kind() const
{
return "sequence";
}
override Type getType()
{
/* If this tuple represents a type, return that type
*/
//printf("TupleDeclaration::getType() %s\n", toChars());
if (isexp || building)
return null;
if (!tupletype)
{
/* It's only a type tuple if all the Object's are types
*/
for (size_t i = 0; i < objects.length; i++)
{
RootObject o = (*objects)[i];
if (!o.isType())
{
//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.length);
OutBuffer buf;
int hasdeco = 1;
for (size_t i = 0; i < types.length; i++)
{
Type t = (*types)[i];
//printf("type = %s\n", t.toChars());
version (none)
{
buf.printf("_%s_%d", ident.toChars(), i);
auto id = Identifier.idPool(buf.extractSlice());
auto arg = new Parameter(Loc.initial, STC.in_, t, id, null);
}
else
{
auto arg = new Parameter(Loc.initial, 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.length; 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());
return isexp ? foreachVar((s) { return s.needThis(); }) != 0 : false;
}
/***********************************************************
* Calls dg(Dsymbol) for each Dsymbol, which should be a VarDeclaration
* inside VarExp (isexp == true).
* Params:
* dg = delegate to call for each Dsymbol
*/
extern (D) void foreachVar(scope void delegate(Dsymbol) dg)
{
assert(isexp);
foreach (o; *objects)
{
if (auto e = o.isExpression())
if (auto ve = e.isVarExp())
dg(ve.var);
}
}
/***********************************************************
* Calls dg(Dsymbol) for each Dsymbol, which should be a VarDeclaration
* inside VarExp (isexp == true).
* If dg returns !=0, stops and returns that value else returns 0.
* Params:
* dg = delegate to call for each Dsymbol
* Returns:
* last value returned by dg()
*/
extern (D) int foreachVar(scope int delegate(Dsymbol) dg)
{
assert(isexp);
foreach (o; *objects)
{
if (auto e = o.isExpression())
if (auto ve = e.isVarExp())
if(auto ret = dg(ve.var))
return ret;
}
return 0;
}
override inout(TupleDeclaration) isTupleDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
* https://dlang.org/spec/declaration.html#AliasDeclaration
*/
extern (C++) final class AliasDeclaration : Declaration
{
Dsymbol aliassym; // alias ident = aliassym;
Dsymbol overnext; // next in overload list
Dsymbol _import; // !=null if unresolved internal alias for selective import
extern (D) this(const ref Loc loc, Identifier ident, Type type) @safe
{
super(loc, ident);
//printf("AliasDeclaration(id = '%s', type = %p)\n", ident.toChars(), type);
//printf("type = '%s'\n", type.toChars());
this.type = type;
assert(type);
}
extern (D) this(const ref Loc loc, Identifier ident, Dsymbol s) @safe
{
super(loc, ident);
//printf("AliasDeclaration(id = '%s', s = %p)\n", ident.toChars(), s);
assert(s != this);
this.aliassym = s;
assert(s);
}
static AliasDeclaration create(const ref Loc loc, Identifier id, Type type) @safe
{
return new AliasDeclaration(loc, id, type);
}
override AliasDeclaration 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)
{
/*
If type has been resolved already we could
still be inserting an alias from an import.
If we are handling an alias then pretend
it was inserting and return true, if not then
false since we didn't even pretend to insert something.
*/
return this._import && this.equals(s);
}
// https://issues.dlang.org/show_bug.cgi?id=23865
// only insert if the symbol can be part of a set
const s1 = s.toAlias();
const isInsertCandidate = s1.isFuncDeclaration() || s1.isOverDeclaration() || s1.isTemplateDeclaration();
/* 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 td = s.toAlias().isTemplateDeclaration())
s = td.funcroot ? td.funcroot : td;
if (auto fd = sa.isFuncDeclaration())
{
auto fa = new FuncAliasDeclaration(ident, fd);
fa.visibility = visibility;
fa.parent = parent;
aliassym = fa;
if (isInsertCandidate)
return aliassym.overloadInsert(s);
}
if (auto td = sa.isTemplateDeclaration())
{
auto od = new OverDeclaration(ident, td.funcroot ? td.funcroot : td);
od.visibility = visibility;
od.parent = parent;
aliassym = od;
if (isInsertCandidate)
return aliassym.overloadInsert(s);
}
if (auto od = sa.isOverDeclaration())
{
if (sa.ident != ident || sa.parent != parent)
{
od = new OverDeclaration(ident, od);
od.visibility = visibility;
od.parent = parent;
aliassym = od;
}
if (isInsertCandidate)
return od.overloadInsert(s);
}
if (auto os = sa.isOverloadSet())
{
if (sa.ident != ident || sa.parent != parent)
{
os = new OverloadSet(ident, os);
// TODO: visibility is lost here b/c OverloadSets have no visibility 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.visibility = visibility;
os.parent = parent;
aliassym = os;
}
if (isInsertCandidate)
{
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;
// Reading the AliasDeclaration
if (!(adFlags & ignoreRead))
adFlags |= wasRead; // can never assign to this AliasDeclaration again
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(loc, "%s `%s` recursive alias declaration", kind, toPrettyChars);
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
{
// stop AliasAssign tuple building
if (aliassym)
{
if (auto td = aliassym.isTupleDeclaration())
{
if (td.building)
{
td.building = false;
semanticRun = PASS.semanticdone;
return td;
}
}
}
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()