src/Doc/System/Sessions.thy
author wenzelm
Sat Jan 26 13:43:37 2013 +0100 (2013-01-26)
changeset 51055 5c4be88f8747
parent 50546 1b01a57d2749
child 51417 d266f9329368
permissions -rw-r--r--
some explanations of important build options;
tuned;
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theory Sessions
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imports Base
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begin
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chapter {* Isabelle sessions and build management \label{ch:session} *}
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text {* An Isabelle \emph{session} consists of a collection of related
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  theories that may be associated with formal documents
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  (\chref{ch:present}).  There is also a notion of \emph{persistent
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  heap} image to capture the state of a session, similar to
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  object-code in compiled programming languages.  Thus the concept of
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  session resembles that of a ``project'' in common IDE environments,
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  but the specific name emphasizes the connection to interactive
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  theorem proving: the session wraps-up the results of
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  user-interaction with the prover in a persistent form.
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  Application sessions are built on a given parent session, which may
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  be built recursively on other parents.  Following this path in the
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  hierarchy eventually leads to some major object-logic session like
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  @{text "HOL"}, which itself is based on @{text "Pure"} as the common
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  root of all sessions.
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  Processing sessions may take considerable time.  Isabelle build
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  management helps to organize this efficiently.  This includes
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  support for parallel build jobs, in addition to the multithreaded
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  theory and proof checking that is already provided by the prover
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  process itself.  *}
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section {* Session ROOT specifications \label{sec:session-root} *}
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text {* Session specifications reside in files called @{verbatim ROOT}
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  within certain directories, such as the home locations of registered
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  Isabelle components or additional project directories given by the
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  user.
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  The ROOT file format follows the lexical conventions of the
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  \emph{outer syntax} of Isabelle/Isar, see also
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  \cite{isabelle-isar-ref}.  This defines common forms like
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  identifiers, names, quoted strings, verbatim text, nested comments
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  etc.  The grammar for a single @{syntax session_entry} is given as
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  syntax diagram below; each ROOT file may contain multiple session
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  specifications like this.
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  Isabelle/jEdit (\secref{sec:tool-jedit}) includes a simple editing
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  mode @{verbatim "isabelle-root"} for session ROOT files, which is
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  enabled by default for any file of that name.
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  @{rail "
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    @{syntax_def session_entry}: @'session' spec '=' (@{syntax name} '+')? body
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    ;
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    body: description? options? ( theories + ) files?
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    ;
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    spec: @{syntax name} groups? dir?
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    ;
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    groups: '(' (@{syntax name} +) ')'
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    ;
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    dir: @'in' @{syntax name}
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    ;
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    description: @'description' @{syntax text}
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    ;
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    options: @'options' opts
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    ;
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    opts: '[' ( (@{syntax name} '=' value | @{syntax name}) + ',' ) ']'
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    ;
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    value: @{syntax name} | @{syntax real}
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    ;
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    theories: @'theories' opts? ( @{syntax name} * )
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    ;
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    files: @'files' ( @{syntax name} + )
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    "}
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  \begin{description}
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  \item \isakeyword{session}~@{text "A = B + body"} defines a new
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  session @{text "A"} based on parent session @{text "B"}, with its
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  content given in @{text body} (theories and auxiliary source files).
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  Note that a parent (like @{text "HOL"}) is mandatory in practical
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  applications: only Isabelle/Pure can bootstrap itself from nothing.
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  All such session specifications together describe a hierarchy (tree)
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  of sessions, with globally unique names.  The new session name
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  @{text "A"} should be sufficiently long and descriptive to stand on
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  its own in a potentially large library.
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  \item \isakeyword{session}~@{text "A (groups)"} indicates a
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  collection of groups where the new session is a member.  Group names
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  are uninterpreted and merely follow certain conventions.  For
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  example, the Isabelle distribution tags some important sessions by
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  the group name called ``@{text "main"}''.  Other projects may invent
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  their own conventions, but this requires some care to avoid clashes
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  within this unchecked name space.
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  \item \isakeyword{session}~@{text "A"}~\isakeyword{in}~@{text "dir"}
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  specifies an explicit directory for this session; by default this is
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  the current directory of the @{verbatim ROOT} file.
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  All theories and auxiliary source files are located relatively to
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  the session directory.  The prover process is run within the same as
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  its current working directory.
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  \item \isakeyword{description}~@{text "text"} is a free-form
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  annotation for this session.
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  \item \isakeyword{options}~@{text "[x = a, y = b, z]"} defines
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  separate options (\secref{sec:system-options}) that are used when
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  processing this session, but \emph{without} propagation to child
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  sessions.  Note that @{text "z"} abbreviates @{text "z = true"} for
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  Boolean options.
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  \item \isakeyword{theories}~@{text "options names"} specifies a
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  block of theories that are processed within an environment that is
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  augmented by the given options, in addition to the global session
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  options given before.  Any number of blocks of \isakeyword{theories}
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  may be given.  Options are only active for each
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  \isakeyword{theories} block separately.
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  \item \isakeyword{files}~@{text "files"} lists additional source
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  files that are involved in the processing of this session.  This
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  should cover anything outside the formal content of the theory
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  sources, say some auxiliary {\TeX} files that are required for
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  document processing.  In contrast, files that are loaded formally
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  within a theory, e.g.\ via @{keyword "ML_file"}, need not be
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  declared again.
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  \end{description}
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*}
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subsubsection {* Examples *}
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text {* See @{file "~~/src/HOL/ROOT"} for a diversity of practically
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  relevant situations, although it uses relatively complex
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  quasi-hierarchic naming conventions like @{text "HOL\<dash>SPARK"},
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  @{text "HOL\<dash>SPARK\<dash>Examples"}.  An alternative is to use
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  unqualified names that are relatively long and descriptive, as in
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  the Archive of Formal Proofs (\url{http://afp.sf.net}), for
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  example. *}
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section {* System build options \label{sec:system-options} *}
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text {* See @{file "~~/etc/options"} for the main defaults provided by
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  the Isabelle distribution.  Isabelle/jEdit (\secref{sec:tool-jedit})
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  includes a simple editing mode @{verbatim "isabelle-options"} for
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  this file-format.
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  The following options are particulary relevant to build Isabelle
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  sessions, in particular with document preparation
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  (\chref{ch:present}).
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  \begin{itemize}
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  \item @{system_option_def "browser_info"} controls output of HTML
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  browser info, see also \secref{sec:info}.
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  \item @{system_option_def "document"} specifies the document output
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  format, see @{tool document} option @{verbatim "-o"} in
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  \secref{sec:tool-document}.  In practice, the most relevant values
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  are @{verbatim "document=false"} or @{verbatim "document=pdf"}.
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  \item @{system_option_def "document_output"} specifies an
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  alternative directory for generated output of the document
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  preparation system; the default is within the @{setting
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  "ISABELLE_BROWSER_INFO"} hierarchy as explained in
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  \secref{sec:info}.  See also @{tool mkroot}, which generates a
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  default configuration with output readily available to the author of
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  the document.
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  \item @{system_option_def "document_variants"} specifies document
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  variants as a colon-separated list of @{text "name=tags"} entries,
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  corresponding to @{tool document} options @{verbatim "-n"} and
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  @{verbatim "-t"}.
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  For example, @{verbatim
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  "document_variants=document:outline=/proof,/ML"} indicates two
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  documents: the one called @{verbatim document} with default tags,
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  and the other called @{verbatim outline} where proofs and ML
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  sections are folded.
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  Document variant names are just a matter of conventions.  It is also
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  possible to use different document variant names (without tags) for
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  different document root entries, see also
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  \secref{sec:tool-document}.
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  \item @{system_option_def "document_graph"} tells whether the
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  generated document files should include a theory graph (cf.\
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  \secref{sec:browse} and \secref{sec:info}).  The resulting EPS or
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  PDF file can be included as graphics in {\LaTeX}.
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  Note that this option is usually determined as static parameter of
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  some session (e.g.\ within its @{verbatim ROOT} file) and \emph{not}
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  given globally or on the command line of @{tool build}.
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  \item @{system_option_def "threads"} determines the number of worker
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  threads for parallel checking of theories and proofs.  The default
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  @{text "0"} means that a sensible maximum value is determined by the
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  underlying hardware.  For machines with many cores or with
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  hyperthreading, this is often requires manual adjustment (on the
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  command-line or within personal settings or preferences, not within
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  a session @{verbatim ROOT}).
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  \item @{system_option_def "condition"} specifies a comma-separated
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  list of process environment variables (or Isabelle settings) that
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  are required for the subsequent theories to be processed.
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  Conditions are considered ``true'' if the corresponding environment
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  value is defined and non-empty.
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  For example, the @{verbatim "condition=ISABELLE_FULL_TEST"} may be
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  used to guard extraordinary theories, which are meant to be enabled
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  explicitly via some shell prefix @{verbatim "env ISABELLE_FULL_TEST=true"}
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  before invoking @{tool build}.
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  \item @{system_option_def "timeout"} specifies a real wall-clock
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  timeout (in seconds) for the session as a whole.  The timer is
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  controlled outside the ML process by the JVM that runs
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  Isabelle/Scala.  Thus it is relatively reliable in canceling
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  processes that get out of control, even if there is a deadlock
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  without CPU time usage.
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  \end{itemize}
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  The @{tool_def options} tool prints Isabelle system options.  Its
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  command-line usage is:
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\begin{ttbox}
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Usage: isabelle options [OPTIONS] [MORE_OPTIONS ...]
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  Options are:
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    -b           include $ISABELLE_BUILD_OPTIONS
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    -l           list options
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    -x FILE      export to FILE in YXML format
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  Report Isabelle system options, augmented by MORE_OPTIONS given as
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  arguments NAME=VAL or NAME.
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\end{ttbox}
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  The command line arguments provide additional system options of the
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  form @{text "name"}@{verbatim "="}@{text "value"} or @{text name}
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  for Boolean options.
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  Option @{verbatim "-b"} augments the implicit environment of system
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  options by the ones of @{setting ISABELLE_BUILD_OPTIONS}, cf.\
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  \secref{sec:tool-build}.
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  Option @{verbatim "-x"} specifies a file to export the result in
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  YXML format, instead of printing it in human-readable form.
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*}
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section {* Invoking the build process \label{sec:tool-build} *}
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text {* The @{tool_def build} tool invokes the build process for
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  Isabelle sessions.  It manages dependencies between sessions,
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  related sources of theories and auxiliary files, and target heap
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  images.  Accordingly, it runs instances of the prover process with
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  optional document preparation.  Its command-line usage
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  is:\footnote{Isabelle/Scala provides the same functionality via
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  \texttt{isabelle.Build.build}.}
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\begin{ttbox}
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Usage: isabelle build [OPTIONS] [SESSIONS ...]
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  Options are:
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    -D DIR       include session directory and select its sessions
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    -R           operate on requirements of selected sessions
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    -a           select all sessions
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    -b           build heap images
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    -c           clean build
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    -d DIR       include session directory
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    -g NAME      select session group NAME
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    -j INT       maximum number of parallel jobs (default 1)
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    -l           list session source files
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    -n           no build -- test dependencies only
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    -o OPTION    override session configuration OPTION
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                 (via NAME=VAL or NAME)
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    -s           system build mode: produce output in ISABELLE_HOME
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    -v           verbose
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  Build and manage Isabelle sessions, depending on implicit
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  ISABELLE_BUILD_OPTIONS="..."
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  ML_PLATFORM="..."
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  ML_HOME="..."
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  ML_SYSTEM="..."
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  ML_OPTIONS="..."
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\end{ttbox}
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  \medskip Isabelle sessions are defined via session ROOT files as
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  described in (\secref{sec:session-root}).  The totality of sessions
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  is determined by collecting such specifications from all Isabelle
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  component directories (\secref{sec:components}), augmented by more
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  directories given via options @{verbatim "-d"}~@{text "DIR"} on the
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  command line.  Each such directory may contain a session
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  \texttt{ROOT} file with several session specifications.
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  Any session root directory may refer recursively to further
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  directories of the same kind, by listing them in a catalog file
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  @{verbatim "ROOTS"} line-by-line.  This helps to organize large
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  collections of session specifications, or to make @{verbatim "-d"}
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  command line options persistent (say within @{verbatim
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  "$ISABELLE_HOME_USER/ROOTS"}).
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  \medskip The subset of sessions to be managed is determined via
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  individual @{text "SESSIONS"} given as command-line arguments, or
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  session groups that are given via one or more options @{verbatim
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  "-g"}~@{text "NAME"}.  Option @{verbatim "-a"} selects all sessions.
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  The build tool takes session dependencies into account: the set of
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  selected sessions is completed by including all ancestors.
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  \medskip Option @{verbatim "-R"} reverses the selection in the sense
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  that it refers to its requirements: all ancestor sessions excluding
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  the original selection.  This allows to prepare the stage for some
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  build process with different options, before running the main build
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  itself (without option @{verbatim "-R"}).
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  \medskip Option @{verbatim "-D"} is similar to @{verbatim "-d"}, but
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  selects all sessions that are defined in the given directories.
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  \medskip The build process depends on additional options
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  (\secref{sec:system-options}) that are passed to the prover
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  eventually.  The settings variable @{setting_ref
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  ISABELLE_BUILD_OPTIONS} allows to provide additional defaults, e.g.\
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  \texttt{ISABELLE_BUILD_OPTIONS="document=pdf threads=4"}. Moreover,
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  the environment of system build options may be augmented on the
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  command line via @{verbatim "-o"}~@{text "name"}@{verbatim
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  "="}@{text "value"} or @{verbatim "-o"}~@{text "name"}, which
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  abbreviates @{verbatim "-o"}~@{text "name"}@{verbatim"=true"} for
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  Boolean options.  Multiple occurrences of @{verbatim "-o"} on the
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  command-line are applied in the given order.
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  \medskip Option @{verbatim "-b"} ensures that heap images are
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  produced for all selected sessions.  By default, images are only
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  saved for inner nodes of the hierarchy of sessions, as required for
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  other sessions to continue later on.
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  \medskip Option @{verbatim "-c"} cleans all descendants of the
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  selected sessions before performing the specified build operation.
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  \medskip Option @{verbatim "-n"} omits the actual build process
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  after the preparatory stage (including optional cleanup).  Note that
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  the return code always indicates the status of the set of selected
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  sessions.
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  \medskip Option @{verbatim "-j"} specifies the maximum number of
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  parallel build jobs (prover processes).  Each prover process is
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  subject to a separate limit of parallel worker threads, cf.\ system
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  option @{system_option_ref threads}.
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  \medskip Option @{verbatim "-s"} enables \emph{system mode}, which
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  means that resulting heap images and log files are stored in
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  @{verbatim "$ISABELLE_HOME/heaps"} instead of the default location
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  @{setting ISABELLE_OUTPUT} (which is normally in @{setting
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  ISABELLE_HOME_USER}, i.e.\ the user's home directory).
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  \medskip Option @{verbatim "-v"} increases the general level of
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  verbosity.  Option @{verbatim "-l"} lists the source files that
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  contribute to a session.
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*}
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subsubsection {* Examples *}
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text {*
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  Build a specific logic image:
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\begin{ttbox}
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isabelle build -b HOLCF
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\end{ttbox}
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  \smallskip Build the main group of logic images:
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\begin{ttbox}
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isabelle build -b -g main
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\end{ttbox}
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  \smallskip Provide a general overview of the status of all Isabelle
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  sessions, without building anything:
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\begin{ttbox}
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isabelle build -a -n -v
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\end{ttbox}
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  \smallskip Build all sessions with HTML browser info and PDF
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  document preparation:
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\begin{ttbox}
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isabelle build -a -o browser_info -o document=pdf
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\end{ttbox}
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  \smallskip Build all sessions with a maximum of 8 parallel prover
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  processes and 4 worker threads each (on a machine with many cores):
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\begin{ttbox}
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isabelle build -a -j8 -o threads=4
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\end{ttbox}
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  \smallskip Build some session images with cleanup of their
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  descendants, while retaining their ancestry:
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\begin{ttbox}
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isabelle build -b -c HOL-Boogie HOL-SPARK
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\end{ttbox}
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  \smallskip Clean all sessions without building anything:
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\begin{ttbox}
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isabelle build -a -n -c
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\end{ttbox}
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  \smallskip Build all sessions from some other directory hierarchy,
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  according to the settings variable @{verbatim "AFP"} that happens to
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  be defined inside the Isabelle environment:
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\begin{ttbox}
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isabelle build -D '$AFP'
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\end{ttbox}
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  \smallskip Inform about the status of all sessions required for AFP,
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  without building anything yet:
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\begin{ttbox}
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isabelle build -D '$AFP' -R -v -n
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\end{ttbox}
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*}
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section {* Build dialog *}
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text {* The @{tool_def build_dialog} provides a simple GUI wrapper to
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  the tool Isabelle @{tool build} tool.  This enables user interfaces
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  like Isabelle/jEdit \secref{sec:tool-jedit} to provide read-made
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  logic image on startup.  Its command-line usage is:
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\begin{ttbox}
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Usage: isabelle build_dialog [OPTIONS] LOGIC
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  Options are:
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    -L OPTION    default logic via system option
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    -d DIR       include session directory
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    -l NAME      logic session name
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    -s           system build mode: produce output in ISABELLE_HOME
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  Build Isabelle logic session image via GUI dialog (default: \$ISABELLE_LOGIC).
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\end{ttbox}
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  \medskip Option @{verbatim "-l"} specifies an explicit logic session
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  name.  Option @{verbatim "-L"} specifies a system option name as
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  fall-back to determine the logic session name.  If both are omitted
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  or have empty value, @{setting ISABELLE_LOGIC} is used as default.
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  \medskip Options @{verbatim "-d"} and @{verbatim "-s"} have the same
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  meaning as for the command-line @{tool build} tool itself.  *}
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end