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attrib.d
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attrib.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1999-2019 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/attrib.d, _attrib.d)
* Documentation: https://dlang.org/phobos/dmd_attrib.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/attrib.d
*/
module dmd.attrib;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.cond;
import dmd.declaration;
import dmd.dmodule;
import dmd.dscope;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.expression;
import dmd.expressionsem;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.mtype;
import dmd.objc;
import dmd.root.outbuffer;
import dmd.target;
import dmd.tokens;
import dmd.visitor;
/***********************************************************
*/
extern (C++) abstract class AttribDeclaration : Dsymbol
{
Dsymbols* decl; // array of Dsymbol's
extern (D) this(Dsymbols* decl)
{
this.decl = decl;
}
Dsymbols* include(Scope* sc)
{
if (errors)
return null;
return decl;
}
override final int apply(Dsymbol_apply_ft_t fp, void* param)
{
return include(_scope).foreachDsymbol( (s) { return s && s.apply(fp, param); } );
}
/****************************************
* Create a new scope if one or more given attributes
* are different from the sc's.
* If the returned scope != sc, the caller should pop
* the scope after it used.
*/
extern (D) static Scope* createNewScope(Scope* sc, StorageClass stc, LINK linkage,
CPPMANGLE cppmangle, Prot protection, int explicitProtection,
AlignDeclaration aligndecl, PINLINE inlining)
{
Scope* sc2 = sc;
if (stc != sc.stc ||
linkage != sc.linkage ||
cppmangle != sc.cppmangle ||
!protection.isSubsetOf(sc.protection) ||
explicitProtection != sc.explicitProtection ||
aligndecl !is sc.aligndecl ||
inlining != sc.inlining)
{
// create new one for changes
sc2 = sc.copy();
sc2.stc = stc;
sc2.linkage = linkage;
sc2.cppmangle = cppmangle;
sc2.protection = protection;
sc2.explicitProtection = explicitProtection;
sc2.aligndecl = aligndecl;
sc2.inlining = inlining;
}
return sc2;
}
/****************************************
* A hook point to supply scope for members.
* addMember, setScope, importAll, semantic, semantic2 and semantic3 will use this.
*/
Scope* newScope(Scope* sc)
{
return sc;
}
override void addMember(Scope* sc, ScopeDsymbol sds)
{
Dsymbols* d = include(sc);
if (d)
{
Scope* sc2 = newScope(sc);
d.foreachDsymbol( s => s.addMember(sc2, sds) );
if (sc2 != sc)
sc2.pop();
}
}
override void setScope(Scope* sc)
{
Dsymbols* d = include(sc);
//printf("\tAttribDeclaration::setScope '%s', d = %p\n",toChars(), d);
if (d)
{
Scope* sc2 = newScope(sc);
d.foreachDsymbol( s => s.setScope(sc2) );
if (sc2 != sc)
sc2.pop();
}
}
override void importAll(Scope* sc)
{
Dsymbols* d = include(sc);
//printf("\tAttribDeclaration::importAll '%s', d = %p\n", toChars(), d);
if (d)
{
Scope* sc2 = newScope(sc);
d.foreachDsymbol( s => s.importAll(sc2) );
if (sc2 != sc)
sc2.pop();
}
}
override void addComment(const(char)* comment)
{
//printf("AttribDeclaration::addComment %s\n", comment);
if (comment)
{
include(null).foreachDsymbol( s => s.addComment(comment) );
}
}
override const(char)* kind() const
{
return "attribute";
}
override bool oneMember(Dsymbol* ps, Identifier ident)
{
Dsymbols* d = include(null);
return Dsymbol.oneMembers(d, ps, ident);
}
override void setFieldOffset(AggregateDeclaration ad, uint* poffset, bool isunion)
{
include(null).foreachDsymbol( s => s.setFieldOffset(ad, poffset, isunion) );
}
override final bool hasPointers()
{
return include(null).foreachDsymbol( (s) { return s.hasPointers(); } ) != 0;
}
override final bool hasStaticCtorOrDtor()
{
return include(null).foreachDsymbol( (s) { return s.hasStaticCtorOrDtor(); } ) != 0;
}
override final void checkCtorConstInit()
{
include(null).foreachDsymbol( s => s.checkCtorConstInit() );
}
/****************************************
*/
override final void addLocalClass(ClassDeclarations* aclasses)
{
include(null).foreachDsymbol( s => s.addLocalClass(aclasses) );
}
override final void addObjcSymbols(ClassDeclarations* classes, ClassDeclarations* categories)
{
objc.addSymbols(this, classes, categories);
}
override final inout(AttribDeclaration) isAttribDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) class StorageClassDeclaration : AttribDeclaration
{
StorageClass stc;
extern (D) this(StorageClass stc, Dsymbols* decl)
{
super(decl);
this.stc = stc;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new StorageClassDeclaration(stc, Dsymbol.arraySyntaxCopy(decl));
}
override Scope* newScope(Scope* sc)
{
StorageClass scstc = sc.stc;
/* These sets of storage classes are mutually exclusive,
* so choose the innermost or most recent one.
*/
if (stc & (STC.auto_ | STC.scope_ | STC.static_ | STC.extern_ | STC.manifest))
scstc &= ~(STC.auto_ | STC.scope_ | STC.static_ | STC.extern_ | STC.manifest);
if (stc & (STC.auto_ | STC.scope_ | STC.static_ | STC.tls | STC.manifest | STC.gshared))
scstc &= ~(STC.auto_ | STC.scope_ | STC.static_ | STC.tls | STC.manifest | STC.gshared);
if (stc & (STC.const_ | STC.immutable_ | STC.manifest))
scstc &= ~(STC.const_ | STC.immutable_ | STC.manifest);
if (stc & (STC.gshared | STC.shared_ | STC.tls))
scstc &= ~(STC.gshared | STC.shared_ | STC.tls);
if (stc & (STC.safe | STC.trusted | STC.system))
scstc &= ~(STC.safe | STC.trusted | STC.system);
scstc |= stc;
//printf("scstc = x%llx\n", scstc);
return createNewScope(sc, scstc, sc.linkage, sc.cppmangle,
sc.protection, sc.explicitProtection, sc.aligndecl, sc.inlining);
}
override final bool oneMember(Dsymbol* ps, Identifier ident)
{
bool t = Dsymbol.oneMembers(decl, ps, ident);
if (t && *ps)
{
/* This is to deal with the following case:
* struct Tick {
* template to(T) { const T to() { ... } }
* }
* For eponymous function templates, the 'const' needs to get attached to 'to'
* before the semantic analysis of 'to', so that template overloading based on the
* 'this' pointer can be successful.
*/
FuncDeclaration fd = (*ps).isFuncDeclaration();
if (fd)
{
/* Use storage_class2 instead of storage_class otherwise when we do .di generation
* we'll wind up with 'const const' rather than 'const'.
*/
/* Don't think we need to worry about mutually exclusive storage classes here
*/
fd.storage_class2 |= stc;
}
}
return t;
}
override void addMember(Scope* sc, ScopeDsymbol sds)
{
Dsymbols* d = include(sc);
if (d)
{
Scope* sc2 = newScope(sc);
d.foreachDsymbol( (s)
{
//printf("\taddMember %s to %s\n", s.toChars(), sds.toChars());
// STC.local needs to be attached before the member is added to the scope (because it influences the parent symbol)
if (auto decl = s.isDeclaration())
{
decl.storage_class |= stc & STC.local;
if (auto sdecl = s.isStorageClassDeclaration()) // TODO: why is this not enough to deal with the nested case?
{
sdecl.stc |= stc & STC.local;
}
}
s.addMember(sc2, sds);
});
if (sc2 != sc)
sc2.pop();
}
}
override inout(StorageClassDeclaration) isStorageClassDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class DeprecatedDeclaration : StorageClassDeclaration
{
Expression msg;
const(char)* msgstr;
extern (D) this(Expression msg, Dsymbols* decl)
{
super(STC.deprecated_, decl);
this.msg = msg;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new DeprecatedDeclaration(msg.syntaxCopy(), Dsymbol.arraySyntaxCopy(decl));
}
/**
* Provides a new scope with `STC.deprecated_` and `Scope.depdecl` set
*
* Calls `StorageClassDeclaration.newScope` (as it must be called or copied
* in any function overriding `newScope`), then set the `Scope`'s depdecl.
*
* Returns:
* Always a new scope, to use for this `DeprecatedDeclaration`'s members.
*/
override Scope* newScope(Scope* sc)
{
auto scx = super.newScope(sc);
// The enclosing scope is deprecated as well
if (scx == sc)
scx = sc.push();
scx.depdecl = this;
return scx;
}
override void setScope(Scope* sc)
{
//printf("DeprecatedDeclaration::setScope() %p\n", this);
if (decl)
Dsymbol.setScope(sc); // for forward reference
return AttribDeclaration.setScope(sc);
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class LinkDeclaration : AttribDeclaration
{
LINK linkage;
extern (D) this(LINK p, Dsymbols* decl)
{
super(decl);
//printf("LinkDeclaration(linkage = %d, decl = %p)\n", p, decl);
linkage = (p == LINK.system) ? target.systemLinkage() : p;
}
static LinkDeclaration create(LINK p, Dsymbols* decl)
{
return new LinkDeclaration(p, decl);
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new LinkDeclaration(linkage, Dsymbol.arraySyntaxCopy(decl));
}
override Scope* newScope(Scope* sc)
{
return createNewScope(sc, sc.stc, this.linkage, sc.cppmangle, sc.protection, sc.explicitProtection,
sc.aligndecl, sc.inlining);
}
override const(char)* toChars() const
{
return "extern ()";
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class CPPMangleDeclaration : AttribDeclaration
{
CPPMANGLE cppmangle;
extern (D) this(CPPMANGLE p, Dsymbols* decl)
{
super(decl);
//printf("CPPMangleDeclaration(cppmangle = %d, decl = %p)\n", p, decl);
cppmangle = p;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new CPPMangleDeclaration(cppmangle, Dsymbol.arraySyntaxCopy(decl));
}
override Scope* newScope(Scope* sc)
{
return createNewScope(sc, sc.stc, LINK.cpp, cppmangle, sc.protection, sc.explicitProtection,
sc.aligndecl, sc.inlining);
}
override const(char)* toChars() const
{
return "extern ()";
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class ProtDeclaration : AttribDeclaration
{
Prot protection;
Identifiers* pkg_identifiers;
/**
* Params:
* loc = source location of attribute token
* p = protection attribute data
* decl = declarations which are affected by this protection attribute
*/
extern (D) this(const ref Loc loc, Prot p, Dsymbols* decl)
{
super(decl);
this.loc = loc;
this.protection = p;
//printf("decl = %p\n", decl);
}
/**
* Params:
* loc = source location of attribute token
* pkg_identifiers = list of identifiers for a qualified package name
* decl = declarations which are affected by this protection attribute
*/
extern (D) this(const ref Loc loc, Identifiers* pkg_identifiers, Dsymbols* decl)
{
super(decl);
this.loc = loc;
this.protection.kind = Prot.Kind.package_;
this.pkg_identifiers = pkg_identifiers;
if (pkg_identifiers !is null && pkg_identifiers.dim > 0)
{
Dsymbol tmp;
Package.resolve(pkg_identifiers, &tmp, null);
protection.pkg = tmp ? tmp.isPackage() : null;
}
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
if (protection.kind == Prot.Kind.package_)
return new ProtDeclaration(this.loc, pkg_identifiers, Dsymbol.arraySyntaxCopy(decl));
else
return new ProtDeclaration(this.loc, protection, Dsymbol.arraySyntaxCopy(decl));
}
override Scope* newScope(Scope* sc)
{
if (pkg_identifiers)
dsymbolSemantic(this, sc);
return createNewScope(sc, sc.stc, sc.linkage, sc.cppmangle, this.protection, 1, sc.aligndecl, sc.inlining);
}
override void addMember(Scope* sc, ScopeDsymbol sds)
{
if (pkg_identifiers)
{
Dsymbol tmp;
Package.resolve(pkg_identifiers, &tmp, null);
protection.pkg = tmp ? tmp.isPackage() : null;
pkg_identifiers = null;
}
if (protection.kind == Prot.Kind.package_ && protection.pkg && sc._module)
{
Module m = sc._module;
Package pkg = m.parent ? m.parent.isPackage() : null;
if (!pkg || !protection.pkg.isAncestorPackageOf(pkg))
error("does not bind to one of ancestor packages of module `%s`", m.toPrettyChars(true));
}
return AttribDeclaration.addMember(sc, sds);
}
override const(char)* kind() const
{
return "protection attribute";
}
override const(char)* toPrettyChars(bool)
{
assert(protection.kind > Prot.Kind.undefined);
OutBuffer buf;
protectionToBuffer(&buf, protection);
return buf.extractString();
}
override inout(ProtDeclaration) isProtDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class AlignDeclaration : AttribDeclaration
{
Expression ealign;
enum structalign_t UNKNOWN = 0;
static assert(STRUCTALIGN_DEFAULT != UNKNOWN);
structalign_t salign = UNKNOWN;
extern (D) this(const ref Loc loc, Expression ealign, Dsymbols* decl)
{
super(decl);
this.loc = loc;
this.ealign = ealign;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new AlignDeclaration(loc,
ealign.syntaxCopy(), Dsymbol.arraySyntaxCopy(decl));
}
override Scope* newScope(Scope* sc)
{
return createNewScope(sc, sc.stc, sc.linkage, sc.cppmangle, sc.protection, sc.explicitProtection, this, sc.inlining);
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class AnonDeclaration : AttribDeclaration
{
bool isunion;
int sem; // 1 if successful semantic()
uint anonoffset; // offset of anonymous struct
uint anonstructsize; // size of anonymous struct
uint anonalignsize; // size of anonymous struct for alignment purposes
extern (D) this(const ref Loc loc, bool isunion, Dsymbols* decl)
{
super(decl);
this.loc = loc;
this.isunion = isunion;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new AnonDeclaration(loc, isunion, Dsymbol.arraySyntaxCopy(decl));
}
override void setScope(Scope* sc)
{
if (decl)
Dsymbol.setScope(sc);
return AttribDeclaration.setScope(sc);
}
override void setFieldOffset(AggregateDeclaration ad, uint* poffset, bool isunion)
{
//printf("\tAnonDeclaration::setFieldOffset %s %p\n", isunion ? "union" : "struct", this);
if (decl)
{
/* This works by treating an AnonDeclaration as an aggregate 'member',
* so in order to place that member we need to compute the member's
* size and alignment.
*/
size_t fieldstart = ad.fields.dim;
/* Hackishly hijack ad's structsize and alignsize fields
* for use in our fake anon aggregate member.
*/
uint savestructsize = ad.structsize;
uint savealignsize = ad.alignsize;
ad.structsize = 0;
ad.alignsize = 0;
uint offset = 0;
decl.foreachDsymbol( (s)
{
s.setFieldOffset(ad, &offset, this.isunion);
if (this.isunion)
offset = 0;
});
/* https://issues.dlang.org/show_bug.cgi?id=13613
* If the fields in this.members had been already
* added in ad.fields, just update *poffset for the subsequent
* field offset calculation.
*/
if (fieldstart == ad.fields.dim)
{
ad.structsize = savestructsize;
ad.alignsize = savealignsize;
*poffset = ad.structsize;
return;
}
anonstructsize = ad.structsize;
anonalignsize = ad.alignsize;
ad.structsize = savestructsize;
ad.alignsize = savealignsize;
// 0 sized structs are set to 1 byte
if (anonstructsize == 0)
{
anonstructsize = 1;
anonalignsize = 1;
}
assert(_scope);
auto alignment = _scope.alignment();
/* Given the anon 'member's size and alignment,
* go ahead and place it.
*/
anonoffset = AggregateDeclaration.placeField(
poffset,
anonstructsize, anonalignsize, alignment,
&ad.structsize, &ad.alignsize,
isunion);
// Add to the anon fields the base offset of this anonymous aggregate
//printf("anon fields, anonoffset = %d\n", anonoffset);
foreach (const i; fieldstart .. ad.fields.dim)
{
VarDeclaration v = ad.fields[i];
//printf("\t[%d] %s %d\n", i, v.toChars(), v.offset);
v.offset += anonoffset;
}
}
}
override const(char)* kind() const
{
return (isunion ? "anonymous union" : "anonymous struct");
}
override inout(AnonDeclaration) isAnonDeclaration() inout
{
return this;
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class PragmaDeclaration : AttribDeclaration
{
Expressions* args; // array of Expression's
extern (D) this(const ref Loc loc, Identifier ident, Expressions* args, Dsymbols* decl)
{
super(decl);
this.loc = loc;
this.ident = ident;
this.args = args;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
//printf("PragmaDeclaration::syntaxCopy(%s)\n", toChars());
assert(!s);
return new PragmaDeclaration(loc, ident, Expression.arraySyntaxCopy(args), Dsymbol.arraySyntaxCopy(decl));
}
override Scope* newScope(Scope* sc)
{
if (ident == Id.Pinline)
{
PINLINE inlining = PINLINE.default_;
if (!args || args.dim == 0)
inlining = PINLINE.default_;
else if (args.dim != 1)
{
error("one boolean expression expected for `pragma(inline)`, not %d", args.dim);
args.setDim(1);
(*args)[0] = new ErrorExp();
}
else
{
Expression e = (*args)[0];
if (e.op != TOK.int64 || !e.type.equals(Type.tbool))
{
if (e.op != TOK.error)
{
error("pragma(`inline`, `true` or `false`) expected, not `%s`", e.toChars());
(*args)[0] = new ErrorExp();
}
}
else if (e.isBool(true))
inlining = PINLINE.always;
else if (e.isBool(false))
inlining = PINLINE.never;
}
return createNewScope(sc, sc.stc, sc.linkage, sc.cppmangle, sc.protection, sc.explicitProtection, sc.aligndecl, inlining);
}
return sc;
}
override const(char)* kind() const
{
return "pragma";
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) class ConditionalDeclaration : AttribDeclaration
{
Condition condition;
Dsymbols* elsedecl; // array of Dsymbol's for else block
extern (D) this(Condition condition, Dsymbols* decl, Dsymbols* elsedecl)
{
super(decl);
//printf("ConditionalDeclaration::ConditionalDeclaration()\n");
this.condition = condition;
this.elsedecl = elsedecl;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new ConditionalDeclaration(condition.syntaxCopy(), Dsymbol.arraySyntaxCopy(decl), Dsymbol.arraySyntaxCopy(elsedecl));
}
override final bool oneMember(Dsymbol* ps, Identifier ident)
{
//printf("ConditionalDeclaration::oneMember(), inc = %d\n", condition.inc);
if (condition.inc != Include.notComputed)
{
Dsymbols* d = condition.include(null) ? decl : elsedecl;
return Dsymbol.oneMembers(d, ps, ident);
}
else
{
bool res = (Dsymbol.oneMembers(decl, ps, ident) && *ps is null && Dsymbol.oneMembers(elsedecl, ps, ident) && *ps is null);
*ps = null;
return res;
}
}
// Decide if 'then' or 'else' code should be included
override Dsymbols* include(Scope* sc)
{
//printf("ConditionalDeclaration::include(sc = %p) scope = %p\n", sc, scope);
if (errors)
return null;
assert(condition);
return condition.include(_scope ? _scope : sc) ? decl : elsedecl;
}
override final void addComment(const(char)* comment)
{
/* Because addComment is called by the parser, if we called
* include() it would define a version before it was used.
* But it's no problem to drill down to both decl and elsedecl,
* so that's the workaround.
*/
if (comment)
{
decl .foreachDsymbol( s => s.addComment(comment) );
elsedecl.foreachDsymbol( s => s.addComment(comment) );
}
}
override void setScope(Scope* sc)
{
include(sc).foreachDsymbol( s => s.setScope(sc) );
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
*/
extern (C++) final class StaticIfDeclaration : ConditionalDeclaration
{
ScopeDsymbol scopesym;
private bool addisdone = false; // true if members have been added to scope
private bool onStack = false; // true if a call to `include` is currently active
extern (D) this(Condition condition, Dsymbols* decl, Dsymbols* elsedecl)
{
super(condition, decl, elsedecl);
//printf("StaticIfDeclaration::StaticIfDeclaration()\n");
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new StaticIfDeclaration(condition.syntaxCopy(), Dsymbol.arraySyntaxCopy(decl), Dsymbol.arraySyntaxCopy(elsedecl));
}
/****************************************
* Different from other AttribDeclaration subclasses, include() call requires
* the completion of addMember and setScope phases.
*/
override Dsymbols* include(Scope* sc)
{
//printf("StaticIfDeclaration::include(sc = %p) scope = %p\n", sc, scope);
if (errors || onStack)
return null;
onStack = true;
scope(exit) onStack = false;
if (sc && condition.inc == Include.notComputed)
{
assert(scopesym); // addMember is already done
assert(_scope); // setScope is already done
Dsymbols* d = ConditionalDeclaration.include(_scope);
if (d && !addisdone)
{
// Add members lazily.
d.foreachDsymbol( s => s.addMember(_scope, scopesym) );
// Set the member scopes lazily.
d.foreachDsymbol( s => s.setScope(_scope) );
addisdone = true;
}
return d;
}
else
{
return ConditionalDeclaration.include(sc);
}
}
override void addMember(Scope* sc, ScopeDsymbol sds)
{
//printf("StaticIfDeclaration::addMember() '%s'\n", toChars());
/* This is deferred until the condition evaluated later (by the include() call),
* so that expressions in the condition can refer to declarations
* in the same scope, such as:
*
* template Foo(int i)
* {
* const int j = i + 1;
* static if (j == 3)
* const int k;
* }
*/
this.scopesym = sds;
}
override void setScope(Scope* sc)
{
// do not evaluate condition before semantic pass
// But do set the scope, in case we need it for forward referencing
Dsymbol.setScope(sc);
}
override void importAll(Scope* sc)
{
// do not evaluate condition before semantic pass
}
override const(char)* kind() const
{
return "static if";
}
override void accept(Visitor v)
{
v.visit(this);
}
}
/***********************************************************
* Static foreach at declaration scope, like:
* static foreach (i; [0, 1, 2]){ }
*/
extern (C++) final class StaticForeachDeclaration : AttribDeclaration
{
StaticForeach sfe; /// contains `static foreach` expansion logic
ScopeDsymbol scopesym; /// cached enclosing scope (mimics `static if` declaration)
/++
`include` can be called multiple times, but a `static foreach`
should be expanded at most once. Achieved by caching the result
of the first call. We need both `cached` and `cache`, because
`null` is a valid value for `cache`.
+/
bool onStack = false;
bool cached = false;
Dsymbols* cache = null;
extern (D) this(StaticForeach sfe, Dsymbols* decl)
{
super(decl);
this.sfe = sfe;
}
override Dsymbol syntaxCopy(Dsymbol s)
{
assert(!s);
return new StaticForeachDeclaration(
sfe.syntaxCopy(),
Dsymbol.arraySyntaxCopy(decl));
}
override bool oneMember(Dsymbol* ps, Identifier ident)
{
// Required to support IFTI on a template that contains a
// `static foreach` declaration. `super.oneMember` calls
// include with a `null` scope. As `static foreach` requires
// the scope for expansion, `oneMember` can only return a
// precise result once `static foreach` has been expanded.
if (cached)
{
return super.oneMember(ps, ident);
}
*ps = null; // a `static foreach` declaration may in general expand to multiple symbols
return false;
}
override Dsymbols* include(Scope* sc)
{
if (errors || onStack)
return null;
if (cached)
{
assert(!onStack);
return cache;
}
onStack = true;
scope(exit) onStack = false;
if (_scope)
{
sfe.prepare(_scope); // lower static foreach aggregate
}
if (!sfe.ready())
{
return null; // TODO: ok?
}
// expand static foreach