X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/a42893dda5f4dd2b89fbfe4e497da261159225ca..c808d837f8b1a3baf4ba5871ddc3a82822de7f9e:/doc/syntax.tex?ds=sidebyside

diff --git a/doc/syntax.tex b/doc/syntax.tex
index b18acd5..15948cb 100644
--- a/doc/syntax.tex
+++ b/doc/syntax.tex
@@ -58,7 +58,7 @@ enough that they deserve special notation.
     \syntax{$x^*$ ::= <zero-or-more>$[x]$ ::=
       $\epsilon$ @! <zero-or-more>$[x]$ $x$}
   \end{quote}
-\item $x^+$ abbreviates @<one-or-more>$[x]$, denoting a sequence of zero or
+\item $x^+$ abbreviates @<one-or-more>$[x]$, denoting a sequence of one or
   more occurrences of $x$:
   \begin{quote}
     \syntax{$x^+$ ::= <one-or-more>$[x]$ ::= <zero-or-more>$[x]$ $x$}
@@ -451,8 +451,19 @@ recognized.
 \alt "bool" | "_Bool"
 \alt "imaginary" | "_Imaginary" | "complex" | "_Complex"
 \alt <qualifier>
+\alt <storage-specifier>
+\alt <atomic-type>
 
-<qualifier> ::= "const" | "volatile" | "restrict"
+<qualifier> ::= <atomic> | "const" | "volatile" | "restrict"
+
+<atomic-type> ::=
+  <atomic> "(" @<declaration-specifier>^+ <abstract-declarator> ")"
+
+<atomic> ::= "atomic" | "_Atomic"
+
+<storage-specifier> ::= <alignas> "(" <c-fragment> ")"
+
+<alignas> ::= "alignas" "_Alignas"
 
 <type-name> ::= <identifier>
 \end{grammar}
@@ -469,9 +480,11 @@ defined in the built-in module.
 
 Declaration specifiers may appear in any order.  However, not all
 combinations are permitted.  A declaration specifier must consist of zero or
-more @<qualifier>s, and one of the following, up to reordering.
+more @<qualifier>s, zero or more @<storage-specifier>s, and one of the
+following, up to reordering.
 \begin{itemize}
 \item @<type-name>
+\item @<atomic-type>
 \item @"struct" @<identifier>, @"union" @<identifier>, @"enum" @<identifier>
 \item @"void"
 \item @"_Bool", @"bool"
@@ -509,6 +522,9 @@ All of these have their usual C meanings.
 
 <argument> ::= @<declaration-specifier>^+ <argument-declarator>
 
+<abstract-declarator> ::= <declarator>$[\epsilon, \mbox{@<argument-list>}]$
+
+<argument-declarator> ::= <declarator>$[\mbox{@<identifier> @! $\epsilon$}]$
 <argument-declarator> ::=
   <declarator>$[\mbox{@<identifier> @! $\epsilon$}, \mbox{@<argument-list>}]$
 
@@ -585,6 +601,7 @@ class Sub : Super {
 
 <class-item> ::= <slot-item>
 \alt <initializer-item>
+\alt <initarg-item>
 \alt <fragment-item>
 \alt <message-item>
 \alt <method-item>
@@ -663,7 +680,7 @@ class Example : Super {
 \begin{grammar}
 <initializer-item> ::= @["class"@] <list>$[\mbox{@<slot-initializer>}]$ ";"
 
-<slot-initializer> ::= <dotted-name> "=" <initializer>
+<slot-initializer> ::= <dotted-name> @["=" <initializer>@]
 
 <initializer> :: <c-fragment>
 \end{grammar}
@@ -676,6 +693,22 @@ The first component of the @<dotted-name> must be the nickname of one of the
 class's superclasses (including itself); the second must be the name of a
 slot defined in that superclass.
 
+An @|initarg| property may be set on an instance slot initializer (or a
+direct slot definition).  See \xref{sec:concepts.lifecycle.birth} for the
+details.  An initializer item must have either an @|initarg| property, or an
+initializer expression, or both.
+
+Each class may define at most one initializer item with an explicit
+initializer expression for a given slot.
+
+\subsubsection{Initarg items}
+\begin{grammar}
+<initarg-item> ::=
+  "initarg"
+  @<declaration-specifier>^+
+  <list>$[\mbox{@<init-declarator>}]$ ";"
+\end{grammar}
+
 \subsubsection{Fragment items}
 \begin{grammar}
 <fragment-item> ::= <fragment-kind> "{" <c-fragment> "}"