2014.4 Updates

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and document features common to these systems, many of which had not been

included in any previous standard.

This was the most comprehensive review of Forth systems to date, taking

eighty seven days covering twenty three meetings over eight years.

eighty\place{ed14}{-}seven days covering twenty\place{ed14}{-}three meetings over eight years.

The inclusive nature of the standard allowed the various factions within

the community to unify in support of ANS Forth, with many systems

providing a compatibility layer.

\end{description}

\subsection{Combined Floating-point/Data Stack Obsolescent} % D.7.2

\subsection[Separate Floating-point Stack is now Standard]{%

\replace{X:fp-stack}{Combined Floating-point/Data Stack Obsolescent}{%

\newline Separate Floating-point Stack is now Standard}

} % D.7.2

\label{diff:fpstack}

\remove{X:fp-stack}{%

The requirement for floating-point numbers to be kept on the data stack

has been marked as obsolescent.  This was previously an environmental

dependency/restriction.

dependency/restriction.}

\place{X:fp-stack}{%

	Previously systems could implement either a separate floating-point

	stack or a combined floating-point/data stack; programs were required

	to cater for both (or declare an environmental dependency on a particular

	variant).

}

\begin{description}

\item[Words Affected:] ~\\

	Forth 94 programs (without environmental dependency, i.e., those

	working on either kind of system) remain standard programs.

\remove{X:fp-stack}{%

	Forth 94 systems that implement a separate floating-point stack

	are now standard systems and no longer have an environmental

	restriction on providing a floating-point stack.

	restriction on providing a floating-point stack.}

\place{X:fp-stack}{%

	Forth 94 systems that implement a separate floating-point stack

	continue to be standard systems.}

	Forth 94 systems that implement a combined stack become systems

	with an environmental restriction of not providing a separate

word-set queries being used, it chose not to update the word set-query

mechanism, but rather to mark it as obsolescent.

\pagebreak

\begin{description}

\item[Words Affected:] ~\\

	\word{ENVIRONMENT?}

\item[Transition/Conversion:] ~\\

	Existing programs are unaffected.  Systems implementing the locals

	wordset have to be changed to support at least 16 (previously 8)

	\replace{ed14}{wordset}{ word set} have to be changed to support at least 16 (previously 8)

	locals.

\end{description}

 \label{diff:12:prefix}

Decimal, hexadecimal, binary number literals can now be written

irrespective of BASE by using the prefix \#, \$, \%.  Also, character

irrespective of \word{BASE} by using the prefix \#, \$, \%.  Also, character

literals can be written as 'c'.

Standard programs are unaffected.  Systems have to be changed to

\html{<br class="clear" />}

\subsection{Block word sets}

No words have been added to \xref{wordlist:block}.

\pagebreak

\subsection[Block word sets]{\remove{ed14}{Block word sets}}

\remove{ed14}{No words have been added to \xref{wordlist:block}.}

%\stepcounter{subsection}

\subsection{Double-Number word sets}

The following words have been added to \xref{wordlist:double-ext}:

\wref{double:2VALUE}{}

\subsection{Exception word sets}

No words have been added to \xref{wordlist:exception}.

\subsection[Exception word sets]{\remove{ed14}{Exception word sets}}

\remove{ed14}{No words have been added to \xref{wordlist:exception}.}

%\stepcounter{subsection}

\subsection{Facility word sets}

The following words have been added to \xref{wordlist:facility-ext}:

\wref{local:b:}{}

\subsection{Memory-Allocation word sets}

No words have been added to \xref{wordlist:memory}.

\subsection[Memory-Allocation word sets]{\remove{ed14}{Memory-Allocation word sets}}

\remove{ed14}{No words have been added to \xref{wordlist:memory}.}

%\stepcounter{subsection}

\subsection{Programming-Tools word sets}

\label{diff:12:tools}

\end{minipage}

\html{<br class="clear" />}

\subsection{Search-Order word sets}

No words have been added to \xref{wordlist:search}.

\subsection[Search-Order word sets]{\remove{ed14}{Search-Order word sets}}

\remove{ed14}{No words have been added to \xref{wordlist:search}.}

%\stepcounter{subsection}

\subsection{String word sets}

The following words have been added to the \xref{wordlist:string-ext}:

\end{minipage}

\html{<br class="clear" />}

\subsection{Extended Character word sets}

\subsection{Extended-Character word sets}

The Extended Character word set was introduced by Forth-\snapshot.

The following words make up \xref{wordlist:xchar}:

% !TeX root = forth.tex

\chapter{Documentation requirements}

\label{doc}

\item insufficient space in the dictionary;

\item interpretating a word with undefined interpretation semantics;

\item \replace{ed14}{interpretating}{ interpreting} a word with undefined interpretation semantics;

\item modifying the contents of the input buffer or a string literal

	(\xref[Text-literal regions]{usage:"literal},

\throwdef{-1}{\word{ABORT}}

\throwdef{-2}{\word{ABORTq}}

\throwdef{-3}{stack overflow}

\throwdef{-4}{tack underflow}

\throwdef{-4}{\cbstart\uline{s}tack underflow\cbend}

\throwdef{-5}{return stack overflow}

\throwdef{-6}{return stack underflow}

\throwdef{-7}{do-loops nested too deeply during execution}