dmd.dsymbol

The base class for a D symbol, which can be a module, variable, function, enum, etc.

Authors

Walter Bright

License

Boost License 1.0

Source: dsymbol.d

Documentation: https://dlang.org/phobos/dmd_dsymbol.html

Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/dsymbol.d

  • foreachDsymbol

    Declaration

    int foreachDsymbol(Dsymbols* symbols, scope int delegate(Dsymbol) dg);

    Calls dg(Dsymbol *sym) for each Dsymbol. If dg returns !=0, stops and returns that value else returns 0.

    Parameters

    Dsymbols* symbols

    Dsymbols

    int delegate(Dsymbol) dg

    delegate to call for each Dsymbol

    Return Value

    last value returned by dg()

    See Also

  • foreachDsymbol

    Declaration

    void foreachDsymbol(Dsymbols* symbols, scope void delegate(Dsymbol) dg);

    Calls dg(Dsymbol *sym) for each Dsymbol.

    Parameters

    Dsymbols* symbols

    Dsymbols

    void delegate(Dsymbol) dg

    delegate to call for each Dsymbol

    See Also

  • FieldState

    Declaration

    struct FieldState;

    Struct/Class/Union field state. Used for transitory information when setting field offsets, such as bit fields.

    • offset

      Declaration

      uint offset;

      byte offset for next field

    • fieldOffset

      Declaration

      uint fieldOffset;

      byte offset for the start of the bit field

    • fieldSize

      Declaration

      uint fieldSize;

      byte size of field

    • fieldAlign

      Declaration

      uint fieldAlign;

      byte alignment of field

    • bitOffset

      Declaration

      uint bitOffset;

      bit offset for field

    • inFlight

      Declaration

      bool inFlight;

      bit field is in flight

  • Dsymbol

    Declaration

    class Dsymbol: dmd.ast_node.ASTNode;

    • cppnamespace

      Declaration

      CPPNamespaceDeclaration cppnamespace;

      C++ namespace this symbol belongs to

    • localNum

      Declaration

      ushort localNum;

      perturb mangled name to avoid collisions with those in FuncDeclaration.localsymtab

    • getModule

      Declaration

      final Module getModule();

      Determine which Module a Dsymbol is in.

    • isCsymbol

      Declaration

      final bool isCsymbol();

      Does this Dsymbol come from a C file?

      Return Value

      true if it does

    • getAccessModule

      Declaration

      final Module getAccessModule();

      Determine which Module a Dsymbol is in, as far as access rights go.

    • pastMixin

      Declaration

      final inout inout(Dsymbol) pastMixin();

      pastMixin returns the enclosing symbol if this is a template mixin.

      Discussion

      pastMixinAndNspace does likewise, additionally skipping over Nspaces that are mangleOnly.

      See also parent, toParent and toParent2.

    • toParent

      Declaration

      final inout inout(Dsymbol) toParent();
      final inout inout(Dsymbol) toParent2();
      final inout inout(Dsymbol) toParentDecl();
      final inout inout(Dsymbol) toParentLocal();

      parent field returns a lexically enclosing scope symbol this is a member of.

      Discussion

      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

      1. 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')

    • toParentP

      Declaration

      final Dsymbol toParentP(Dsymbol p1, Dsymbol p2 = null);

      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.

    • followInstantiationContext

      Declaration

      final bool followInstantiationContext(Dsymbol p1, Dsymbol p2 = null);

      Returns true if any of the symbols p1 or p2 resides in the enclosing instantiation scope of this.

    • arraySyntaxCopy

      Declaration

      static Dsymbols* arraySyntaxCopy(Dsymbols* a);

      Do syntax copy of an array of Dsymbol's.

    • toAlias

      Declaration

      Dsymbol toAlias();

      If this symbol is really an alias for another, return that other. If needed, semantic() is invoked due to resolve forward reference.

    • toAlias2

      Declaration

      Dsymbol toAlias2();

      Resolve recursive tuple expansion in eponymous template.

    • setScope

      Declaration

      void setScope(Scope* sc);

      Set scope for future semantic analysis so we can deal better with forward references.

    • search

      Declaration

      Dsymbol search(const ref Loc loc, Identifier ident, int flags = IgnoreNone);

      Search for ident as member of s.

      Parameters

      Loc loc

      location to print for error messages

      Identifier ident

      identifier to search for

      int flags

      IgnoreXXXX

      Return Value

      null if not found

    • searchX

      Declaration

      final Dsymbol searchX(const ref Loc loc, Scope* sc, RootObject id, int flags);

      Search for identifier id as a member of this. id may be a template instance.

      Parameters

      Loc loc

      location to print the error messages

      Scope* sc

      the scope where the symbol is located

      RootObject id

      the id of the symbol

      int flags

      the search flags which can be SearchLocalsOnly or IgnorePrivateImports

      Return Value

      symbol found, NULL if not

    • size

      Declaration

      d_uns64 size(const ref Loc loc);

      Return Value

      SIZE_INVALID when the size cannot be determined

    • isMember

      Declaration

      final inout inout(AggregateDeclaration) isMember();

      Returns an AggregateDeclaration when toParent() is that.

    • isMember2

      Declaration

      final inout inout(AggregateDeclaration) isMember2();

      Returns an AggregateDeclaration when toParent2() is that.

    • isMemberDecl

      Declaration

      final inout inout(AggregateDeclaration) isMemberDecl();

      Returns an AggregateDeclaration when toParentDecl() is that.

    • isMemberLocal

      Declaration

      final inout inout(AggregateDeclaration) isMemberLocal();

      Returns an AggregateDeclaration when toParentLocal() is that.

    • visible

      Declaration

      pure nothrow @nogc @safe Visibility visible();

    • syntaxCopy

      Declaration

      Dsymbol syntaxCopy(Dsymbol s);

      Copy the syntax. Used for template instantiations. If s is NULL, allocate the new object, otherwise fill it in.

    • oneMember

      Declaration

      bool oneMember(Dsymbol* ps, Identifier ident);

      Determine if this symbol is only one.

      Return Value

      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

    • oneMembers

      Declaration

      static bool oneMembers(Dsymbols* members, Dsymbol* ps, Identifier ident);

      Same as Dsymbol::oneMember(), but look at an array of Dsymbols.

    • hasPointers

      Declaration

      bool hasPointers();

      Is Dsymbol a variable that contains pointers?

    • addComment

      Declaration

      void addComment(const(char)* comment);

      Add documentation comment to Dsymbol. Ignore NULL comments.

    • inNonRoot

      Declaration

      final bool inNonRoot();

      Returns true if this symbol is defined in a non-root module without instantiation.

    • accept

      Declaration

      void accept(Visitor v);

  • ScopeDsymbol

    Declaration

    class ScopeDsymbol: dmd.dsymbol.Dsymbol;

    Dsymbol that generates a scope

    • search

      Declaration

      Dsymbol search(const ref Loc loc, Identifier ident, int flags = SearchLocalsOnly);

      This function is #1 on the list of functions that eat cpu time. Be very, very careful about slowing it down.

    • findGetMembers

      Declaration

      final FuncDeclaration findGetMembers();

      Look for member of the form: const(MemberInfo)[] getMembers(string); Returns NULL if not found

    • symtabInsert

      Declaration

      Dsymbol symtabInsert(Dsymbol s);

      Insert Dsymbol in table.

      Parameters

      Dsymbol s

      symbol to add

      Return Value

      null if already in table, s if inserted

    • symtabLookup

      Declaration

      Dsymbol symtabLookup(Dsymbol s, Identifier id);

      Look up identifier in symbol table.

      Parameters

      Dsymbol s

      symbol

      Identifier id

      identifier to look up

      Return Value

      Dsymbol if found, null if not

    • hasStaticCtorOrDtor

      Declaration

      bool hasStaticCtorOrDtor();

      Return true if any of the members are static ctors or static dtors, or if any members have members that are.

    • _foreach

      Declaration

      static int _foreach(Scope* sc, Dsymbols* members, scope ForeachDg dg, size_t* pn = null);

      Expands attribute declarations in members in depth first order. Calls dg(size_t symidx, Dsymbol *sym) for each member. If dg returns !=0, stops and returns that value else returns 0. Use this function to avoid the O(N + N^2/2) complexity of calculating dim and calling N times getNth.

      Return Value

      last value returned by dg()

  • WithScopeSymbol

    Declaration

    class WithScopeSymbol: dmd.dsymbol.ScopeDsymbol;

    With statement scope

  • ArrayScopeSymbol

    Declaration

    class ArrayScopeSymbol: dmd.dsymbol.ScopeDsymbol;

    Array Index/Slice scope

    • search

      Declaration

      Dsymbol search(const ref Loc loc, Identifier ident, int flags = IgnoreNone);

      This override is used to solve $

  • OverloadSet

    Declaration

    class OverloadSet: dmd.dsymbol.Dsymbol;

    Overload Sets

  • ForwardingScopeDsymbol

    Declaration

    class ForwardingScopeDsymbol: dmd.dsymbol.ScopeDsymbol;

    Forwarding ScopeDsymbol. Used by ForwardingAttribDeclaration and ForwardingScopeDeclaration to forward symbol insertions to another scope. See dmd.attrib.ForwardingAttribDeclaration for more details.

    • forward

      Declaration

      ScopeDsymbol forward;

      Symbol to forward insertions to. Can be null before being lazily initialized.

    • symtabLookup

      Declaration

      Dsymbol symtabLookup(Dsymbol s, Identifier id);

      This override handles the following two cases: static foreach (i, i; [0]) { ... } and static foreach (i; [0]) { enum i = 2; }

  • ExpressionDsymbol

    Declaration

    class ExpressionDsymbol: dmd.dsymbol.Dsymbol;

    Class that holds an expression in a Dsymbol wrapper. This is not an AST node, but a class used to pass an expression as a function parameter of type Dsymbol.

  • AliasAssign

    Declaration

    class AliasAssign: dmd.dsymbol.Dsymbol;

    Encapsulate assigning to an alias: identifier = type; identifier = symbol; where identifier is an AliasDeclaration in scope.

    • ident

      Declaration

      Identifier ident;

      Dsymbol's ident will be null, as this class is anonymous

    • type

      Declaration

      Type type;

      replace previous RHS of AliasDeclaration with type

    • aliassym

      Declaration

      Dsymbol aliassym;

      replace previous RHS of AliasDeclaration with aliassym

    • this

      Declaration

      this(const ref Loc loc, Identifier ident, Type type, Dsymbol aliassym);

      only one of type and aliassym can be != null

  • DsymbolTable

    Declaration

    class DsymbolTable: dmd.root.rootobject.RootObject;

    Table of Dsymbol's

    • lookup

      Declaration

      Dsymbol lookup(const Identifier ident);

      Look up Identifier in symbol table

      Parameters

      Identifier ident

      identifer to look up

      Return Value

      Dsymbol if found, null if not

    • update

      Declaration

      void update(Dsymbol s);

      Replace existing symbol in symbol table with s. If it's not there, add it.

      Parameters

      Dsymbol s

      replacement symbol with same identifier

    • insert

      Declaration

      Dsymbol insert(Dsymbol s);

      Insert Dsymbol in table.

      Parameters

      Dsymbol s

      symbol to add

      Return Value

      null if already in table, s if inserted

    • insert

      Declaration

      Dsymbol insert(const Identifier ident, Dsymbol s);

      Insert Dsymbol in table.

      Parameters

      Identifier ident

      identifier to serve as index

      Dsymbol s

      symbol to add

      Return Value

      null if already in table, s if inserted

    • length

      Declaration

      const pure size_t length();

      Return Value

      number of symbols in symbol table

  • handleTagSymbols

    Declaration

    Dsymbol handleTagSymbols(ref Scope sc, Dsymbol s, Dsymbol s2, ScopeDsymbol sds);

    ImportC tag symbols sit in a parallel symbol table, so that this C code works:

    1. struct S { a; }; int S; struct S s;
    But there are relatively few such tag symbols, so that would be a waste of memory and complexity. An additional problem is we'd like the D side to find the tag symbols with ordinary lookup, not lookup in both tables, if the tag symbol is not conflicting with an ordinary symbol. The solution is to put the tag symbols that conflict into an associative array, indexed by the address of the ordinary symbol that conflicts with it. C has no modules, so this associative array is tagSymTab[] in ModuleDeclaration. A side effect of our approach is that D code cannot access a tag symbol that is hidden by an ordinary symbol. This is more of a theoretical problem, as nobody has mentioned it when importing C headers. If someone wants to do it, too bad so sad. Change the C code. This function fixes up the symbol table when faced with adding a new symbol s when there is an existing symbol s2 with the same name. C also allows forward and prototype declarations of tag symbols, this function merges those.

    Parameters

    Scope sc

    context

    Dsymbol s

    symbol to add to symbol table

    Dsymbol s2

    existing declaration

    ScopeDsymbol sds

    symbol table

    Return Value

    if s and s2 are successfully put in symbol table then return the merged symbol, null if they conflict

  • handleSymbolRedeclarations

    Declaration

    Dsymbol handleSymbolRedeclarations(ref Scope sc, Dsymbol s, Dsymbol s2, ScopeDsymbol sds);

    ImportC allows redeclarations of C variables, functions and typedefs. extern int x; int x = 3; and: extern void f(); void f() { } Attempt to merge them.

    Parameters

    Scope sc

    context

    Dsymbol s

    symbol to add to symbol table

    Dsymbol s2

    existing declaration

    ScopeDsymbol sds

    symbol table

    Return Value

    if s and s2 are successfully put in symbol table then return the merged symbol, null if they conflict