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dsymbol.d
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dsymbol.d
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/**
* The base class for a D symbol, which can be a module, variable, function, enum, etc.
*
* 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/dsymbol.d, _dsymbol.d)
* Documentation: https://dlang.org/phobos/dmd_dsymbol.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/dsymbol.d
*/
module dmd.dsymbol;
import core.stdc.stdarg;
import core.stdc.stdio;
import core.stdc.string;
import core.stdc.stdlib;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arraytypes;
import dmd.attrib;
import dmd.astenums;
import dmd.ast_node;
import dmd.gluelayer;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dimport;
import dmd.dmodule;
import dmd.dversion;
import dmd.dscope;
import dmd.dstruct;
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.lexer;
import dmd.location;
import dmd.mtype;
import dmd.nspace;
import dmd.root.aav;
import dmd.root.rmem;
import dmd.rootobject;
import dmd.root.string;
import dmd.statement;
import dmd.staticassert;
import dmd.tokens;
import dmd.visitor;
import dmd.common.outbuffer;
/***************************************
* Calls dg(Dsymbol *sym) for each Dsymbol.
* If dg returns !=0, stops and returns that value else returns 0.
* Params:
* symbols = Dsymbols
* dg = delegate to call for each Dsymbol
* Returns:
* last value returned by dg()
*
* See_Also: $(REF each, dmd, root, array)
*/
int foreachDsymbol(Dsymbols* symbols, scope int delegate(Dsymbol) dg)
{
assert(dg);
if (symbols)
{
/* Do not use foreach, as the size of the array may expand during iteration
*/
for (size_t i = 0; i < symbols.length; ++i)
{
Dsymbol s = (*symbols)[i];
const result = dg(s);
if (result)
return result;
}
}
return 0;
}
/***************************************
* Calls dg(Dsymbol *sym) for each Dsymbol.
* Params:
* symbols = Dsymbols
* dg = delegate to call for each Dsymbol
*
* See_Also: $(REF each, dmd, root, array)
*/
void foreachDsymbol(Dsymbols* symbols, scope void delegate(Dsymbol) dg)
{
assert(dg);
if (symbols)
{
/* Do not use foreach, as the size of the array may expand during iteration
*/
for (size_t i = 0; i < symbols.length; ++i)
{
Dsymbol s = (*symbols)[i];
dg(s);
}
}
}
struct Ungag
{
uint oldgag;
extern (D) this(uint old) nothrow @safe
{
this.oldgag = old;
}
extern (C++) ~this() nothrow
{
global.gag = oldgag;
}
}
struct Visibility
{
///
enum Kind : ubyte
{
undefined,
none, // no access
private_,
package_,
protected_,
public_,
export_,
}
Kind kind;
Package pkg;
extern(C++) this(Visibility.Kind kind, Package pkg = null) pure nothrow @nogc @safe
{
this.kind = kind;
this.pkg = pkg;
}
extern (D):
/**
* Checks if `this` is less or more visible than `other`
*
* Params:
* other = Visibility to compare `this` to.
*
* Returns:
* A value `< 0` if `this` is less visible than `other`,
* a value `> 0` if `this` is more visible than `other`,
* and `0` if they are at the same level.
* Note that `package` visibility with different packages
* will also return `0`.
*/
int opCmp(const Visibility other) const pure nothrow @nogc @safe
{
return this.kind - other.kind;
}
///
unittest
{
assert(Visibility(Visibility.Kind.public_) > Visibility(Visibility.Kind.private_));
assert(Visibility(Visibility.Kind.private_) < Visibility(Visibility.Kind.protected_));
assert(Visibility(Visibility.Kind.package_) >= Visibility(Visibility.Kind.package_));
}
/**
* Checks if `this` is absolutely identical visibility attribute to `other`
*/
bool opEquals(ref const Visibility other) const @safe
{
if (this.kind == other.kind)
{
if (this.kind == Visibility.Kind.package_)
return this.pkg == other.pkg;
return true;
}
return false;
}
}
enum PASS : ubyte
{
initial, // initial state
semantic, // semantic() started
semanticdone, // semantic() done
semantic2, // semantic2() started
semantic2done, // semantic2() done
semantic3, // semantic3() started
semantic3done, // semantic3() done
inline, // inline started
inlinedone, // inline done
obj, // toObjFile() run
}
// Search options
alias SearchOptFlags = uint;
enum SearchOpt : SearchOptFlags
{
all = 0x00, // search for all symbols
ignorePrivateImports = 0x01, // don't search private imports
ignoreErrors = 0x02, // don't give error messages
ignoreAmbiguous = 0x04, // return NULL if ambiguous
localsOnly = 0x08, // only look at locals (don't search imports)
importsOnly = 0x10, // only look in imports
unqualifiedModule = 0x20, // the module scope search is unqualified,
// meaning don't search imports in that scope,
// because qualified module searches search
// their imports
tagNameSpace = 0x40, // search ImportC tag symbol table
ignoreVisibility = 0x80, // also find private and package protected symbols
}
/***********************************************************
* Struct/Class/Union field state.
* Used for transitory information when setting field offsets, such
* as bit fields.
*/
struct FieldState
{
uint offset; /// byte offset for next field
uint fieldOffset; /// byte offset for the start of the bit field
uint fieldSize; /// byte size of field
uint fieldAlign; /// byte alignment of field
uint bitOffset; /// bit offset for field
bool inFlight; /// bit field is in flight
void print() const
{
printf("FieldState.offset = %d bytes\n", offset);
printf(" .fieldOffset = %d bytes\n", fieldOffset);
printf(" .bitOffset = %d bits\n", bitOffset);
printf(" .fieldSize = %d bytes\n", fieldSize);
printf(" .inFlight = %d\n", inFlight);
}
}
// 99.9% of Dsymbols don't have attributes (at least in druntime and Phobos),
// so save memory by grouping them into a separate struct
private struct DsymbolAttributes
{
/// C++ namespace this symbol belongs to
CPPNamespaceDeclaration cppnamespace;
/// customized deprecation message
DeprecatedDeclaration depdecl_;
/// user defined attributes
UserAttributeDeclaration userAttribDecl;
}
/***********************************************************
*/
extern (C++) class Dsymbol : ASTNode
{
Identifier ident;
Dsymbol parent;
Symbol* csym; // symbol for code generator
const Loc loc; // where defined
Scope* _scope; // !=null means context to use for semantic()
const(char)* prettystring; // cached value of toPrettyChars()
private DsymbolAttributes* atts; /// attached attribute declarations
bool errors; // this symbol failed to pass semantic()
PASS semanticRun = PASS.initial;
ushort localNum; /// perturb mangled name to avoid collisions with those in FuncDeclaration.localsymtab
final extern (D) this() nothrow @safe
{
//printf("Dsymbol::Dsymbol(%p)\n", this);
loc = Loc(null, 0, 0);
}
final extern (D) this(Identifier ident) nothrow @safe
{
//printf("Dsymbol::Dsymbol(%p, ident)\n", this);
this.loc = Loc(null, 0, 0);
this.ident = ident;
}
final extern (D) this(const ref Loc loc, Identifier ident) nothrow @safe
{
//printf("Dsymbol::Dsymbol(%p, ident)\n", this);
this.loc = loc;
this.ident = ident;
}
static Dsymbol create(Identifier ident) nothrow @safe
{
return new Dsymbol(ident);
}
override const(char)* toChars() const
{
return ident ? ident.toChars() : "__anonymous";
}
// Getters / setters for fields stored in `DsymbolAttributes`
final nothrow pure @safe
{
private ref DsymbolAttributes getAtts()
{
if (!atts)
atts = new DsymbolAttributes();
return *atts;
}
inout(DeprecatedDeclaration) depdecl() inout { return atts ? atts.depdecl_ : null; }
inout(CPPNamespaceDeclaration) cppnamespace() inout { return atts ? atts.cppnamespace : null; }
inout(UserAttributeDeclaration) userAttribDecl() inout { return atts ? atts.userAttribDecl : null; }
DeprecatedDeclaration depdecl(DeprecatedDeclaration dd)
{
if (!dd && !atts)
return null;
return getAtts().depdecl_ = dd;
}
CPPNamespaceDeclaration cppnamespace(CPPNamespaceDeclaration ns)
{
if (!ns && !atts)
return null;
return getAtts().cppnamespace = ns;
}
UserAttributeDeclaration userAttribDecl(UserAttributeDeclaration uad)
{
if (!uad && !atts)
return null;
return getAtts().userAttribDecl = uad;
}
}
// helper to print fully qualified (template) arguments
const(char)* toPrettyCharsHelper()
{
return toChars();
}
final const(Loc) getLoc()
{
if (!loc.isValid()) // avoid bug 5861.
if (const m = getModule())
return Loc(m.srcfile.toChars(), 0, 0);
return loc;
}
final const(char)* locToChars()
{
return getLoc().toChars();
}
override bool equals(const RootObject o) const
{
if (this == o)
return true;
const s = o.isDsymbol();
if (!s)
return false;
// Overload sets don't have an ident
// Function-local declarations may have identical names
// if they are declared in different scopes
if (s && ident && s.ident && ident.equals(s.ident) && localNum == s.localNum)
return true;
return false;
}
final bool isAnonymous() const
{
return ident is null || ident.isAnonymous;
}
extern(D) private const(char)[] prettyFormatHelper()
{
const cstr = toPrettyChars();
return '`' ~ cstr.toDString() ~ "`\0";
}
/**********************************
* Determine which Module a Dsymbol is in.
*/
final Module getModule()
{
//printf("Dsymbol::getModule()\n");
if (TemplateInstance ti = isInstantiated())
return ti.tempdecl.getModule();
Dsymbol s = this;
while (s)
{
//printf("\ts = %s '%s'\n", s.kind(), s.toPrettyChars());
Module m = s.isModule();
if (m)
return m;
s = s.parent;
}
return null;
}
/**************************************
* Does this Dsymbol come from a C file?
* Returns:
* true if it does
*/
final bool isCsymbol()
{
if (Module m = getModule())
return m.filetype == FileType.c;
return false;
}
/**********************************
* Determine which Module a Dsymbol is in, as far as access rights go.
*/
final Module getAccessModule()
{
//printf("Dsymbol::getAccessModule()\n");
if (TemplateInstance ti = isInstantiated())
return ti.tempdecl.getAccessModule();
Dsymbol s = this;
while (s)
{
//printf("\ts = %s '%s'\n", s.kind(), s.toPrettyChars());
Module m = s.isModule();
if (m)
return m;
TemplateInstance ti = s.isTemplateInstance();
if (ti && ti.enclosing)
{
/* Because of local template instantiation, the parent isn't where the access
* rights come from - it's the template declaration
*/
s = ti.tempdecl;
}
else
s = s.parent;
}
return null;
}
/**
* `pastMixin` returns the enclosing symbol if this is a template mixin.
*
* `pastMixinAndNspace` does likewise, additionally skipping over Nspaces that
* are mangleOnly.
*
* See also `parent`, `toParent` and `toParent2`.
*/
final inout(Dsymbol) pastMixin() inout
{
//printf("Dsymbol::pastMixin() %s\n", toChars());
if (!isTemplateMixin() && !isForwardingAttribDeclaration() && !isForwardingScopeDsymbol())
return this;
if (!parent)
return null;
return parent.pastMixin();
}
/**********************************
* `parent` field returns a lexically enclosing scope symbol this is a member of.
*
* `toParent()` returns a logically enclosing scope symbol this is a member of.
* It skips over TemplateMixin's.
*
* `toParent2()` returns an enclosing scope symbol this is living at runtime.
* It skips over both TemplateInstance's and TemplateMixin's.
* It's used when looking for the 'this' pointer of the enclosing function/class.
*
* `toParentDecl()` similar to `toParent2()` but always follows the template declaration scope
* instead of the instantiation scope.
*
* `toParentLocal()` similar to `toParentDecl()` but follows the instantiation scope
* if a template declaration is non-local i.e. global or static.
*
* Examples:
* ---
* module mod;
* template Foo(alias a) { mixin Bar!(); }
* mixin template Bar() {
* public { // VisibilityDeclaration
* void baz() { a = 2; }
* }
* }
* void test() {
* int v = 1;
* alias foo = Foo!(v);
* foo.baz();
* assert(v == 2);
* }
*
* // s == FuncDeclaration('mod.test.Foo!().Bar!().baz()')
* // s.parent == TemplateMixin('mod.test.Foo!().Bar!()')
* // s.toParent() == TemplateInstance('mod.test.Foo!()')
* // s.toParent2() == FuncDeclaration('mod.test')
* // s.toParentDecl() == Module('mod')
* // s.toParentLocal() == FuncDeclaration('mod.test')
* ---
*/
final inout(Dsymbol) toParent() inout
{
return parent ? parent.pastMixin() : null;
}
/// ditto
final inout(Dsymbol) toParent2() inout
{
if (!parent || !parent.isTemplateInstance && !parent.isForwardingAttribDeclaration() && !parent.isForwardingScopeDsymbol())
return parent;
return parent.toParent2;
}
/// ditto
final inout(Dsymbol) toParentDecl() inout
{
return toParentDeclImpl(false);
}
/// ditto
final inout(Dsymbol) toParentLocal() inout
{
return toParentDeclImpl(true);
}
private inout(Dsymbol) toParentDeclImpl(bool localOnly) inout
{
auto p = toParent();
if (!p || !p.isTemplateInstance())
return p;
auto ti = p.isTemplateInstance();
if (ti.tempdecl && (!localOnly || !(cast(TemplateDeclaration)ti.tempdecl).isstatic))
return ti.tempdecl.toParentDeclImpl(localOnly);
return parent.toParentDeclImpl(localOnly);
}
/**
* Returns the declaration scope scope of `this` unless any of the symbols
* `p1` or `p2` resides in its enclosing instantiation scope then the
* latter is returned.
*/
final Dsymbol toParentP(Dsymbol p1, Dsymbol p2 = null)
{
return followInstantiationContext(p1, p2) ? toParent2() : toParentLocal();
}
final inout(TemplateInstance) isInstantiated() inout
{
if (!parent)
return null;
auto ti = parent.isTemplateInstance();
if (ti && !ti.isTemplateMixin())
return ti;
return parent.isInstantiated();
}
/***
* Returns true if any of the symbols `p1` or `p2` resides in the enclosing
* instantiation scope of `this`.
*/
final bool followInstantiationContext(Dsymbol p1, Dsymbol p2 = null)
{
static bool has2This(Dsymbol s)
{
if (auto f = s.isFuncDeclaration())
return f.hasDualContext();
if (auto ad = s.isAggregateDeclaration())
return ad.vthis2 !is null;
return false;
}
if (has2This(this))
{
assert(p1);
auto outer = toParent();
while (outer)
{
auto ti = outer.isTemplateInstance();
if (!ti)
break;
foreach (oarg; *ti.tiargs)
{
auto sa = getDsymbol(oarg);
if (!sa)
continue;
sa = sa.toAlias().toParent2();
if (!sa)
continue;
if (sa == p1)
return true;
else if (p2 && sa == p2)
return true;
}
outer = ti.tempdecl.toParent();
}
return false;
}
return false;
}
// Check if this function is a member of a template which has only been
// instantiated speculatively, eg from inside is(typeof()).
// Return the speculative template instance it is part of,
// or NULL if not speculative.
final inout(TemplateInstance) isSpeculative() inout
{
if (!parent)
return null;
auto ti = parent.isTemplateInstance();
if (ti && ti.gagged)
return ti;
if (!parent.toParent())
return null;
return parent.isSpeculative();
}
final Ungag ungagSpeculative() const
{
uint oldgag = global.gag;
if (global.gag && !isSpeculative() && !toParent2().isFuncDeclaration())
global.gag = 0;
return Ungag(oldgag);
}
// kludge for template.isSymbol()
override final DYNCAST dyncast() const
{
return DYNCAST.dsymbol;
}
/*************************************
* Do syntax copy of an array of Dsymbol's.
*/
extern (D) static Dsymbols* arraySyntaxCopy(Dsymbols* a)
{
Dsymbols* b = null;
if (a)
{
b = a.copy();
for (size_t i = 0; i < b.length; i++)
{
(*b)[i] = (*b)[i].syntaxCopy(null);
}
}
return b;
}
Identifier getIdent()
{
return ident;
}
const(char)* toPrettyChars(bool QualifyTypes = false)
{
if (prettystring && !QualifyTypes)
return prettystring; // value cached for speed
//printf("Dsymbol::toPrettyChars() '%s'\n", toChars());
if (!parent)
{
auto s = toChars();
if (!QualifyTypes)
prettystring = s;
return s;
}
OutBuffer buf;
void addQualifiers(Dsymbol p)
{
if (p.parent)
{
addQualifiers(p.parent);
buf.writeByte('.');
}
const s = QualifyTypes ? p.toPrettyCharsHelper() : p.toChars();
buf.writestring(s);
}
addQualifiers(this);
auto s = buf.extractSlice(true).ptr;
if (!QualifyTypes)
prettystring = s;
return s;
}
const(char)* kind() const pure nothrow @nogc @safe
{
return "symbol";
}
/*********************************
* If this symbol is really an alias for another,
* return that other.
* If needed, semantic() is invoked due to resolve forward reference.
*/
Dsymbol toAlias()
{
return this;
}
/*********************************
* Resolve recursive tuple expansion in eponymous template.
*/
Dsymbol toAlias2()
{
return toAlias();
}
bool overloadInsert(Dsymbol s)
{
//printf("Dsymbol::overloadInsert('%s')\n", s.toChars());
return false;
}
/*********************************
* Returns:
* SIZE_INVALID when the size cannot be determined
*/
uinteger_t size(const ref Loc loc)
{
.error(loc, "%s `%s` symbol `%s` has no size", kind, toPrettyChars, toChars());
return SIZE_INVALID;
}
bool isforwardRef()
{
return false;
}
// is a 'this' required to access the member
inout(AggregateDeclaration) isThis() inout
{
return null;
}
// is Dsymbol exported?
bool isExport() const
{
return false;
}
// is Dsymbol imported?
bool isImportedSymbol() const
{
return false;
}
// is Dsymbol deprecated?
bool isDeprecated() @safe @nogc pure nothrow const
{
return false;
}
bool isOverloadable() const
{
return false;
}
// is this a LabelDsymbol()?
LabelDsymbol isLabel()
{
return null;
}
/// Returns an AggregateDeclaration when toParent() is that.
final inout(AggregateDeclaration) isMember() inout
{
//printf("Dsymbol::isMember() %s\n", toChars());
auto p = toParent();
//printf("parent is %s %s\n", p.kind(), p.toChars());
return p ? p.isAggregateDeclaration() : null;
}
/// Returns an AggregateDeclaration when toParent2() is that.
final inout(AggregateDeclaration) isMember2() inout
{
//printf("Dsymbol::isMember2() '%s'\n", toChars());
auto p = toParent2();
//printf("parent is %s %s\n", p.kind(), p.toChars());
return p ? p.isAggregateDeclaration() : null;
}
/// Returns an AggregateDeclaration when toParentDecl() is that.
final inout(AggregateDeclaration) isMemberDecl() inout
{
//printf("Dsymbol::isMemberDecl() '%s'\n", toChars());
auto p = toParentDecl();
//printf("parent is %s %s\n", p.kind(), p.toChars());
return p ? p.isAggregateDeclaration() : null;
}
/// Returns an AggregateDeclaration when toParentLocal() is that.
final inout(AggregateDeclaration) isMemberLocal() inout
{
//printf("Dsymbol::isMemberLocal() '%s'\n", toChars());
auto p = toParentLocal();
//printf("parent is %s %s\n", p.kind(), p.toChars());
return p ? p.isAggregateDeclaration() : null;
}
// is this a member of a ClassDeclaration?
final ClassDeclaration isClassMember()
{
auto ad = isMember();
return ad ? ad.isClassDeclaration() : null;
}
// is this a type?
Type getType()
{
return null;
}
// need a 'this' pointer?
bool needThis()
{
return false;
}
/*************************************
*/
Visibility visible() pure nothrow @nogc @safe
{
return Visibility(Visibility.Kind.public_);
}
/**************************************
* Copy the syntax.
* Used for template instantiations.
* If s is NULL, allocate the new object, otherwise fill it in.
*/
Dsymbol syntaxCopy(Dsymbol s)
{
printf("%s %s\n", kind(), toChars());
assert(0);
}
/**************************************
* Determine if this symbol is only one.
* Returns:
* false, ps = null: There are 2 or more symbols
* true, ps = null: There are zero symbols
* true, ps = symbol: The one and only one symbol
*/
bool oneMember(out Dsymbol ps, Identifier ident)
{
//printf("Dsymbol::oneMember()\n");
ps = this;
return true;
}
/*****************************************
* Same as Dsymbol::oneMember(), but look at an array of Dsymbols.
*/
extern (D) static bool oneMembers(Dsymbols* members, out Dsymbol ps, Identifier ident)
{
//printf("Dsymbol::oneMembers() %d\n", members ? members.length : 0);
Dsymbol s = null;
if (!members)
{
ps = null;
return true;
}
for (size_t i = 0; i < members.length; i++)
{
Dsymbol sx = (*members)[i];
bool x = sx.oneMember(ps, ident);
//printf("\t[%d] kind %s = %d, s = %p\n", i, sx.kind(), x, *ps);
if (!x)
{
//printf("\tfalse 1\n");
assert(ps is null);
return false;
}
if (ps)
{
assert(ident);
if (!ps.ident || !ps.ident.equals(ident))
continue;
if (!s)
s = ps;
else if (s.isOverloadable() && ps.isOverloadable())
{
// keep head of overload set
FuncDeclaration f1 = s.isFuncDeclaration();
FuncDeclaration f2 = ps.isFuncDeclaration();
if (f1 && f2)
{
assert(!f1.isFuncAliasDeclaration());
assert(!f2.isFuncAliasDeclaration());
for (; f1 != f2; f1 = f1.overnext0)
{
if (f1.overnext0 is null)
{
f1.overnext0 = f2;
break;
}
}
}
}
else // more than one symbol
{
ps = null;
//printf("\tfalse 2\n");
return false;
}
}
}
ps = s; // s is the one symbol, null if none
//printf("\ttrue\n");
return true;
}
/*****************************************
* Is Dsymbol a variable that contains pointers?
*/
bool hasPointers()
{
//printf("Dsymbol::hasPointers() %s\n", toChars());
return false;
}
bool hasStaticCtorOrDtor()
{
//printf("Dsymbol::hasStaticCtorOrDtor() %s\n", toChars());
return false;
}
void addObjcSymbols(ClassDeclarations* classes, ClassDeclarations* categories)
{
}
void checkCtorConstInit()
{
}
/****************************************
* Add documentation comment to Dsymbol.
* Ignore NULL comments.
*/
void addComment(const(char)* comment)
{
if (!comment || !*comment)
return;
//printf("addComment '%s' to Dsymbol %p '%s'\n", comment, this, toChars());
void* h = cast(void*)this; // just the pointer is the key
auto p = h in commentHashTable;
if (!p)
{
commentHashTable[h] = comment;
return;
}
if (strcmp(*p, comment) != 0)
{
// Concatenate the two
*p = Lexer.combineComments((*p).toDString(), comment.toDString(), true);
}
}
/// get documentation comment for this Dsymbol
final const(char)* comment()
{
//printf("getcomment: %p '%s'\n", this, this.toChars());
if (auto p = cast(void*)this in commentHashTable)
{
//printf("comment: '%s'\n", *p);
return *p;
}
return null;
}
/* Shell around addComment() to avoid disruption for the moment */
final void comment(const(char)* comment) { addComment(comment); }
private extern (D) __gshared const(char)*[void*] commentHashTable;
/**********************************
* Get ddoc unittest associated with this symbol.
* (only use this with ddoc)
* Returns: ddoc unittest, null if none
*/
final UnitTestDeclaration ddocUnittest()
{
if (auto p = cast(void*)this in ddocUnittestHashTable)
return *p;
return null;
}
/**********************************
* Set ddoc unittest associated with this symbol.