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dmd.attrib
Defines declarations of various attributes.
The term 'attribute' refers to things that can apply to a larger scope than a single declaration.
Among them are:
- Alignment (align(8))
- User defined attributes (@UDA)
- Function Attributes (@safe)
- Storage classes (static, __gshared)
- Mixin declarations (mixin("int x;"))
- Conditional compilation (static if, static foreach)
- Linkage (extern(C))
- Anonymous structs / unions
- Protection (private, public)
- Deprecated declarations (@deprecated)
Authors:
License:
Source attrib.d
Documentation https://dlang.org/phobos/dmd_attrib.html
- abstract class
AttribDeclaration
: dmd.dsymbol.Dsymbol; - Abstract attribute applied to Dsymbol's used as a common ancestor for storage classes (StorageClassDeclaration), linkage (LinkageDeclaration) and others.
- Dsymbols*
decl
; - Dsymbol's affected by this AttribDeclaration
- static Scope*
createNewScope
(Scope*sc
, StorageClassstc
, LINKlinkage
, CPPMANGLEcppmangle
, Visibilityvisibility
, intexplicitVisibility
, AlignDeclarationaligndecl
, PragmaDeclarationinlining
); - 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.
- Scope*
newScope
(Scope*sc
); - A hook point to supply scope for members. addMember, setScope, importAll, semantic, semantic2 and semantic3 will use this.
- final void
addObjcSymbols
(ClassDeclarations*classes
, ClassDeclarations*categories
);
- class
StorageClassDeclaration
: dmd.attrib.AttribDeclaration; - Storage classes applied to Dsymbols, e.g. const int i;
- class
DeprecatedDeclaration
: dmd.attrib.StorageClassDeclaration; - Deprecation with an additional message applied to Dsymbols, e.g. deprecated("Superseeded by foo") int bar;. (Note that deprecated int bar; is currently represented as a StorageClassDeclaration with STC.deprecated_)deprecated(<msg>) <decl...>
- Expression
msg
; - deprecation message
- const(char)*
msgstr
; - cached string representation of msg
- Scope*
newScope
(Scope*sc
); - Provides a new scope with STC.deprecated_ and Scope.depdecl setCalls StorageClassDeclaration.
newScope
(as it must be called or copied in any function overridingnewScope
), then set the Scope's depdecl.Returns:Always a new scope, to use for this DeprecatedDeclaration's members.
- class
LinkDeclaration
: dmd.attrib.AttribDeclaration; - Linkage attribute applied to Dsymbols, e.g. extern(C) void foo().extern(<linkage>) <decl...>
- LINK
linkage
; - either explicitly set or default_
- class
CPPMangleDeclaration
: dmd.attrib.AttribDeclaration; - Attribute declaring whether an external aggregate should be mangled as a struct or class in C++, e.g. extern(C++, struct) class C { ... }. This is required for correct name mangling on MSVC targets, see cppmanglewin.d for details.extern(C++, <cppmangle>) <decl...>
- class
CPPNamespaceDeclaration
: dmd.attrib.AttribDeclaration; - A node to represent an extern(C++) namespace attributeThere are two ways to declarate a symbol as member of a namespace: Nspace and
CPPNamespaceDeclaration
. The former creates a scope for the symbol, and inject them in the parent scope at the same time. The later, this class, has no semantic implications and is only used for mangling. Additionally, this class allows one to use reserved identifiers (D keywords) in the namespace. ACPPNamespaceDeclaration
can be created from an Identifier (already resolved) or from an Expression, which is CTFE-ed and can be either a TupleExp, in which can additionalCPPNamespaceDeclaration
nodes are created, or a StringExp. Note that this class, like Nspace, matches only one identifier part of a namespace. For the namespace "foo::bar", the will be aCPPNamespaceDeclaration
with its ident set to "bar", and its namespace field pointing to anotherCPPNamespaceDeclaration
with its ident set to "foo".- Expression
exp
; - CTFE-able expression, resolving to TupleExp or StringExp
- Scope*
newScope
(Scope*sc
); - Returns:A copy of the parent scope, with this as namespace and C++ linkage
- class
VisibilityDeclaration
: dmd.attrib.AttribDeclaration; - Visibility declaration for Dsymbols, e.g. public int i;<visibility> <decl...> or package(<pkg_identifiers>) <decl...> if pkg_identifiers !is null
- Visibility
visibility
; - the visibility
- Identifier[]
pkg_identifiers
; - identifiers for package(foo.bar) or null
- @safe this(const ref Loc
loc
, Visibilityvisibility
, Dsymbols*decl
); - Parameters:
Loc loc
source location of attribute token Visibility visibility
visibility attribute data Dsymbols* decl
declarations which are affected by this visibility attribute - this(const ref Loc
loc
, Identifier[]pkg_identifiers
, Dsymbols*decl
); - Parameters:
Loc loc
source location of attribute token Identifier[] pkg_identifiers
list of identifiers for a qualified package name Dsymbols* decl
declarations which are affected by this visibility attribute
- class
AlignDeclaration
: dmd.attrib.AttribDeclaration; - Alignment attribute for aggregates, members and variables.align(<ealign>) <decl...> or align <decl...> if ealign is null
- Expressions*
exps
; - Expression(s) yielding the desired alignment,
- structalign_t
salign
; - the largest value wins the actual alignment is Unknown until it's either set to the value of ealign or the default if ealign is null ( / an error ocurred)
- class
AnonDeclaration
: dmd.attrib.AttribDeclaration; - An anonymous struct/union (defined by isunion).
- bool
isunion
; - whether it's a union
- 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
- class
PragmaDeclaration
: dmd.attrib.AttribDeclaration; - Pragma applied to Dsymbols, e.g. pragma(inline, true) void foo, but not PragmaStatement's like pragma(msg, "hello");.pragma(
, ) - Expressions*
args
; - parameters of this pragma
- class
ConditionalDeclaration
: dmd.attrib.AttribDeclaration; - A conditional compilation declaration, used for version / debug and specialized for static if.
{ } else { } - Condition
condition
; - condition deciding whether decl or elsedecl applies
- Dsymbols*
elsedecl
; - array of Dsymbol's for else block
- class
StaticIfDeclaration
: dmd.attrib.ConditionalDeclaration; - `
{ static if ( ) { } else { } }` - ScopeDsymbol
scopesym
; - enclosing symbol (e.g. module) where symbols will be inserted
- Dsymbols*
include
(Scope*sc
); - Different from other AttribDeclaration subclasses, include() call requires the completion of addMember and setScope phases.
class
StaticForeachDeclaration
: dmd.attrib.AttribDeclaration;
Static foreach at declaration scope, like:
static foreach (i; [0, 1, 2]){ }
- StaticForeach
sfe
; - contains static foreach expansion logic
- ScopeDsymbol
scopesym
; - cached enclosing scope (mimics static if declaration)
- bool
onStack
; - 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.
class
ForwardingAttribDeclaration
: dmd.attrib.AttribDeclaration;
Collection of declarations that stores foreach index variables in a
local symbol table. Other symbols declared within are forwarded to
another scope, like:
static foreach (i; 0 .. 10) // loop variables for different indices do not conflict.
{ // this body is expanded into 10 ForwardingAttribDeclarations, where i has storage class STC.local
mixin("enum x" ~ to!string(i) ~ " = i"); // ok, can access current loop variable
}
static foreach (i; 0.. 10)
{
pragma(msg, mixin("x" ~ to!string(i))); // ok, all 10 symbols are visible as they were forwarded to the global scope
}
static assert (!is(typeof(i))); // loop index variable is not visible outside of the static foreach loop
A StaticForeachDeclaration generates one
ForwardingAttribDeclaration for each expansion of its body. The
AST of the ForwardingAttribDeclaration contains both the `static
foreach variables and the respective copy of the static foreach`
body. The functionality is achieved by using a
ForwardingScopeDsymbol as the parent symbol for the generated
declarations.
- Scope*
newScope
(Scope*sc
); - Use the ForwardingScopeDsymbol as the parent symbol for members.
class
MixinDeclaration
: dmd.attrib.AttribDeclaration;
Mixin declarations, like:
mixin("int x");
https://dlang.org/spec/module.html#mixin-declaration
class
UserAttributeDeclaration
: dmd.attrib.AttribDeclaration;
User defined attributes look like:
@foo(args, ...)
@(args, ...)
- static bool
isGNUABITag
(Expressione
); - Check if the provided expression references core.attribute.gnuAbiTagThis should be called after semantic has been run on the expression. Semantic on UDA happens in semantic2 (see dmd.semantic2).Parameters:
Expression e
Expression to check (usually from UserAttributeDeclaration.atts) Returns:true if the expression references the compiler-recognized gnuAbiTag - static void
checkGNUABITag
(Dsymbolsym
, LINKlinkage
); - Called from a symbol's semantic to check if gnuAbiTag UDA can be applied to themDirectly emits an error if the UDA doesn't work with this symbolParameters:
Dsymbol sym
symbol to check for gnuAbiTag LINK linkage
Linkage of the symbol (Declaration.link or sc.link)
bool
isCoreUda
(Dsymbol sym
, Identifier ident
);
Returns true if the given symbol is a symbol declared in
core.attribute and has the given identifier.
This is used to determine if a symbol is a UDA declared in
core.attribute.
Parameters:
Dsymbol sym |
the symbol to check |
Identifier ident |
the name of the expected UDA |
int
foreachUdaNoSemantic
(Dsymbol sym
, int delegate(Expression) dg
);
Iterates the UDAs attached to the given symbol, without performing semantic
analysis.
Use this function instead of foreachUda if semantic analysis of
sym
is
still in progress.
Parameters:
Dsymbol sym |
the symbol to get the UDAs from |
int delegate(Expression) dg |
called once for each UDA |
Returns:
If
dg
returns != 0, stops the iteration and returns that value.
Otherwise, returns 0.bool
isEnumAttribute
(Expression e
, Identifier id
);
Returns:
true if the given expression is an enum from core.attribute named
id
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Ddoc on Wed Dec 18 08:51:36 2024