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+<?xml version="1.0" encoding="latin1" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+  <header>
+    <copyright>
+      <year>2006</year><year>2009</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      The contents of this file are subject to the Erlang Public License,
+      Version 1.1, (the "License"); you may not use this file except in
+      compliance with the License. You should have received a copy of the
+      Erlang Public License along with this software. If not, it can be
+      retrieved online at http://www.erlang.org/.
+    
+      Software distributed under the License is distributed on an "AS IS"
+      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+      the License for the specific language governing rights and limitations
+      under the License.
+    
+    </legalnotice>
+
+    <title>Dialyzer Release Notes</title>
+    <prepared>otp_appnotes</prepared>
+    <docno>nil</docno>
+    <date>nil</date>
+    <rev>nil</rev>
+    <file>notes.xml</file>
+  </header>
+  <p>This document describes the changes made to the Dialyzer
+    application.</p>
+
+<section><title>Dialyzer 2.1.0</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+          <p>
+	    The documentation is now built with open source tools
+	    (xsltproc and fop) that exists on most platforms. One
+	    visible change is that the frames are removed.</p>
+          <p>
+	    Own Id: OTP-8201</p>
+        </item>
+        <item>
+          <p>
+	    Dialyzer can statically detect some kinds of data races
+	    in Erlang programs. Use the new option -Wrace_conditions
+	    to enable the race analysis. The technique is described
+	    in a paper which is available at:
+	    http://www.it.uu.se/research/group/hipe/dialyzer/publications/races.pdf</p>
+          <p>
+	    Added support for packages (thanks to Maria Christakis).</p>
+          <p>
+	    There has been a major change in the default mode of
+	    Dialyzer. Previously, the default mode was the GUI, while
+	    now it is the command line. As a result of this change,
+	    it is now possible to analyze a set of files/dirs with
+	    the command: </p><list> <item>dialyzer file1 ...
+	    fileN</item> </list><p> In other words, the -c
+	    (--command-line) option is no longer necessary, though it
+	    will be retained for some time for backwards
+	    compatibility. To start dialyzer's GUI use either of the
+	    following commands: </p><list> <item>dialyzer --gui %%
+	    for the old gs-based GUI</item> <item>dialyzer --wx %%
+	    for the new wx-based GUI (where available)</item>
+	    </list><p></p>
+          <p>
+	    There is a new option --apps which allows the user to
+	    easily refer to Erlang/OTP applications and include them
+	    in the analysis or in the building of the PLT. For
+	    example, we recommend building the PLT with: </p><list>
+	    <item>dialyzer --build_plt --apps erts kernel stdlib
+	    mnesia ...</item> </list><p></p>
+          <p>
+	    The new option can also take absolute file names as well
+	    as applications. Note that the application versions that
+	    will be included in the PLT are those that correspond to
+	    the Erlang/OTP system which is used.</p>
+          <p>
+	    Dialyzer has a new wxWidgets based GUI (thanks to Elli
+	    Frangaki) for platforms where the wx application is
+	    available.</p>
+          <p>
+	    Own Id: OTP-8300</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 2.0.0</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+	    <p>There is a major addition to the capabilities of
+	    dialyzer, worthy of bumping the version number. Starting
+	    with this version, dialyzer not only accepts but also
+	    properly processes remote types (i.e., types of the form
+	    ModuleName:TypeName()). Previous dialyzer versions only
+	    accepted this notation in -type and -spec declarations,
+	    but effectively ignored its information by mapping remote
+	    types to the type any(). In contrast, starting with this
+	    version, remote types are used in the analysis and are
+	    also stored in the PLTs. (This addition changes the
+	    format of PLTs and requires rebuilding any PLTs created
+	    by an older dialyzer version.) Note that dialyzer will
+	    complain and abort the analysis of a set of modules if it
+	    needs to process a remote type without a definition
+	    (either because the module does not include a definition
+	    of the type or the module is not included in the
+	    analysis). We may relax this restriction in a future
+	    version.</p>
+	    <p>Fixed minor issue with dialyzer:run/1 crashing (upon
+	    its return) when used for adding type information to an
+	    existing PLT.</p>
+	    <p>Fixed minor but quite annoying issues in dialyzer's
+	    GUI.</p>
+          <p>
+	    Own Id: OTP-8187</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.9.2</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+	    <p>Fixed problem with type inference going into an
+	    infinite loop when analyzing a strongly connected
+	    component of functions that do not return but also
+	    contain an erroneous call which makes them fail and be
+	    assigned the type none() instead of the type unit().</p>
+	    <p>More accurate type information for some BIFs and
+	    library files.</p>
+	    <p>Introduced boolean() as the `official' name for the
+	    type was so far known as bool(). The latter is still
+	    accepted as well as boolean().</p>
+          <p>
+	    Own Id: OTP-8037</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.9.1</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+	    <p>Has better handling of opaque types.</p>
+	    <p>The handling of UTF segments of bitstreams has been
+	    significantly strengthened and revised. In all
+	    probability, now it is correct.</p>
+          <p>
+	    Own Id: OTP-7958</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+<section><title>Dialyzer 1.9.0</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+	    <p>The analysis accepts opaque type declarations and
+	    detects violations of opaqueness of terms of such types.
+	    Starting with R13, many Erlang/OTP standard libraries
+	    (array, dict, digraph, ets, gb_sets, gb_trees, queue, and
+	    sets) contain opaque type declarations of their main data
+	    types. Dialyzer will spit out warnings in code that
+	    explicitly depends on the structure of these terms.</p>
+	    <p>Added support for handling UTF segments in bitstreams
+	    and for detecting obvious type errors in these segments.
+	    Warning: This code is not terribly tested though since
+	    there are very few Erlang programs which use
+	    Unicode-based binaries - not surprising since this is a
+	    new language feature of R13.</p>
+	    <p>Strengthened the discrepancy identification when
+	    testing for equality and matching between terms of
+	    different types. This detects more bugs in code.</p>
+	    <p>Added warning for M:F(...) calls where M is not a
+	    module term and F is not an atom. Previously, such calls
+	    where found to fail but the reason for the failure was
+	    not reported.</p>
+	    <p>Added a convenient shorthand for the --no_check_plt
+	    option (-n).</p>
+	    <p>Added the --dump_callgraph option for dumping the
+	    callgraph of all files that are analyzed into a specified
+	    file. The callgraph either be dumped in raw format, in
+	    .dot format, or converted to a .ps (postscript) file.
+	    Note that in large callgraphs the generated postscript
+	    file might not be interpretable by Ghostview. (Thanks to
+	    Ilya Khlopotov for the initial version of this
+	    functionality.)</p>
+          <p>
+	    Own Id: OTP-7864</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.8.3</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+	    <p>Added the <c>--no_check_plt</c> option that makes the
+	    startup time faster when working with stable PLTs that do
+	    not change.</p>
+	    <p>Changed the phrasing of some warnings so that they do
+	    not cause confusion to some users and correspond better
+	    to reality.</p>
+          <p>
+	    Own Id: OTP-7632</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.8.2</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+          <p>
+	    Minor updates.</p>
+          <p>
+	    Own Id: OTP-7522</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.8.1</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+          <p>
+	    There is new <c>--raw</c> option for Dialyzer to output
+	    the result of the analysis in Erlang term, to facilitate
+	    later filtering and/or formatting.</p>
+          <p>
+	    Own Id: OTP-7386</p>
+        </item>
+        <item>
+	    <p>The return type of the Erlang interface dialyzer:run/1
+	    has changed to only return a list of warnings. If
+	    something goes wrong dialyzer dies with an exception.</p>
+	    <p>The handling of the PLT is now more flexible. There is
+	    no longer any default PLT included with OTP. Please
+	    consult the manual for the changes.</p>
+          <p>
+	    Own Id: OTP-7389</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.8.0</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+	    <p>Dialyzer's analysis is from now on exclusively based
+	    on success typings. In particular, support for options
+	    <c>--old_style</c> and <c>--dataflow</c> has been
+	    discontinued.</p>
+	    <p>Better and more aggressive handling of type
+	    information in records.</p>
+	    <p>Dialyzer has a new warning option
+	    <c>-Wunmatched_returns</c> which warns for function calls
+	    that ignore the return value. This catches many common
+	    programming errors (e.g. calling <c>file:close/1</c> and
+	    not checking for the absence of errors), interface
+	    discrepancies (e.g. a function returning multiple values
+	    when in reality the function is void and only called for
+	    its side-effects), calling the wrong function (e.g.
+	    <c>io_lib:format/1</c> instead of <c>io:format/1</c>),
+	    and even possible performance defects (e.g. unnecessarily
+	    constructing a list using a list comprehension instead of
+	    using <c>lists:foreach/2</c>). Whenever a function
+	    returns a single atomic value (e.g. 'ok' or pid()), the
+	    warning is suppressed. This allows for "void" functions
+	    (returning a single atom like 'ok') or for calls to
+	    certain builtins like <c>spawn</c>. Because not all calls
+	    which ignore the return value are discrepancies, the
+	    option is off by default and has to be explicitly
+	    requested by the user. But we recommend it
+	    nevertheless.</p>
+	    <p>Some warning options (<c>-Wno_comp</c>,
+	    <c>-Wno_guards</c>, <c>-Wno_unsafe_beam</c>, etc.) which
+	    could be used when analyzing bytecode produced by an old
+	    BEAM compiler have been removed.</p>
+          <p>
+	    Own Id: OTP-7241</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.7.2</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+          <p>
+	    The warnings returned by the Erlang interface now
+	    contains a tag describing the type of warning.</p>
+          <p>
+	    *** POTENTIAL INCOMPATIBILITY ***</p>
+          <p>
+	    Own Id: OTP-7134</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+<section><title>Dialyzer 1.7.1</title>
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+	    <p>Use of success typings is now default, is robust and
+	    detects significantly more errors than in previous
+	    versions.</p>
+	    <p>Dialyzer now accepts and takes into account type
+	    information in record declarations and in contracts --
+	    see related paper in Erlang'07 workshop. Various OTP
+	    applications (e.g. stdlib and kernel) are partially
+	    annotated with appropriate contracts specifying types
+	    information for their functions.</p>
+	    <p>The type previously known as unit() has been renamed
+	    to no_return(). Its use in a contract as the return type
+	    of a function now silences off the "function has no local
+	    return" dialyzer warning without use of the corresponding
+	    option.</p>
+          <p>
+	    Own Id: OTP-6997</p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
+
+  <section>
+    <title>Dialyzer 1.7.0</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Minor Makefile changes.</p>
+          <p>Own Id: OTP-6689</p>
+        </item>
+        <item>
+          <p>Dialyzer can now use success typings to find
+            discrepancies. As a consequence significantly more
+            discrepancies are detected. The downside is that the
+            analysis takes about 2 to 2.5 times longer than in
+            previous versions, and may also result in some warnings
+            that might be harder to interpret even though they are
+            correct. This has been a major change, worth of
+            increasing the version number.</p>
+          <p>New command-line options:</p>
+          <p>--succ_typings Use the success typings analysis.</p>
+          <p>--dataflow (default) Use the previous analysis.</p>
+          <p>The new type unit() has been introduced to handle the
+            return type of non-terminating functions such as
+            servers.</p>
+          <p>Dialyzer's code server uses a compressed
+            representation and the analysis requires significantly
+            less memory than in previous versions.</p>
+          <p>Own Id: OTP-6736</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.6.0</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Dialyzer (in the modes where either source or BEAM
+            code which contains debug_info is analyzed) spits out
+            line information for all discrepancies. This has been a
+            major change, worth of increasing the version number.</p>
+          <p>We warn users that *considerably* more discrepancies
+            are identified by this version of Dialyzer compared with
+            previous ones and applications. If, for some reason,
+            warnings generated by previous versions of Dialyzer are
+            preferable, the command line option --old_style can be
+            employed.</p>
+          <p>Own Id: OTP-6546</p>
+        </item>
+        <item>
+          <p>Dialyzer handles term comparison operators more
+            precisely and is able to identify more discrepancies in
+            'if' or 'case' statements with comparisons.</p>
+          <p></p>
+          <p>Dialyzer has more precise type information for many
+            standard OTP functions.</p>
+          <p>Own Id: OTP-6547</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.5.1</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Updated the chapter "More on the Persistent Lookup Table
+            (PLT)" in Dialyzer User's Guide and added information on
+            how to use Dialyzer from Erlang to <c><![CDATA[dialyzer(3)]]></c>.
+            Also, the Dialyzer text files used by its GUI are now
+            included in the Erlang/OTP release.</p>
+          <p>Own Id: OTP-6361</p>
+        </item>
+        <item>
+          <p>New options <c><![CDATA[--check_init_plt]]></c> and
+            <c><![CDATA[--verbose]]></c>.</p>
+          <p>Improvements in the analysis (meaning that this
+            version can find more discrepancies than the previous
+            version).</p>
+          <p>Own Id: OTP-6421</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.5.0</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Dialyzer's building of PLT is based on a different
+            type inference algorithm. More specifically, Dialyzer
+            uses inference of refined success typings to infer
+            function prototypes. As a result, Dialyzer bases its
+            analysis on a significantly more powerful basis and thus
+            is able to detect more discrepancies. The downside is
+            that building the PLT is a considerably slower process.
+            We will work on improving that.</p>
+          <p>Dialyzer takes into account the BEAM compiler
+            directive <c><![CDATA[-compile({nowarn_unused_function, {F,A}}).]]></c> and then suppresses the warning that
+            function F/A will never be called.</p>
+          <p>Dialyzer's default initial PLT now also includes
+            "mnesia".</p>
+          <p>Own Id: OTP-6304</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.4.2</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Improvements in PLT management.</p>
+          <p>Own Id: OTP-6128</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.4.1</title>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+      <list type="bulleted">
+        <item>
+          <p>Some minor changes.</p>
+        </item>
+      </list>
+    </section>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Some minor changes.</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.4.0</title>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+      <list type="bulleted">
+        <item>
+          <p>Changes for Dialyzer to work with Erlang/OTP R10B-10.</p>
+        </item>
+      </list>
+    </section>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Dialyzer's analysis is significantly faster as it uses a global function
+            call-graph for obtaining type signatures for all analyzed functions.</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.3.1</title>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+      <list type="bulleted">
+        <item>
+          <p>Small changes for Dialyzer to work with Erlang/OTP R10B-5.</p>
+        </item>
+        <item>
+          <p>Fixed a small buglet in the analysis; this affected one of HiPE's files.</p>
+        </item>
+      </list>
+    </section>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Modified setup script for execution under Cygwin (patch by Vlad Dumitrescu).</p>
+        </item>
+        <item>
+          <p>Added command line option --no_warn_on_inline.</p>
+        </item>
+        <item>
+          <p>Dialyzer now explicitly warns when modules with the same name
+            but from different dirs are being analyzed (contribution by Ulf Wiger).</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.3.0</title>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+      <list type="bulleted">
+        <item>
+          <p>Fixed a number of false positives that Dialyzer 1.2.0 was spitting out.</p>
+        </item>
+      </list>
+    </section>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Requires the presence of an Erlang/OTP R10B-4 system.</p>
+        </item>
+        <item>
+          <p>Dialyzer is significantly (approx 40%) faster since it now uses 'ets'
+            rather than 'dets' for its PLT.</p>
+        </item>
+        <item>
+          <p>Slightly improved the precision of the analysis.</p>
+        </item>
+        <item>
+          <p>In the GUI version, Dialyzer now reports the list of modules that should
+            be included in the modules to analyze in order to possibly improve
+            the accuracy of the reported results.</p>
+        </item>
+        <item>
+          <p>Some more information is displayed when calling a function or closure
+            with arguments of the wrong type.</p>
+        </item>
+        <item>
+          <p>The record guard now allows discrepancies involving tuples that are known
+            to be records to be displayed as #rec{} rather than {'rec',_,...,_}</p>
+        </item>
+        <item>
+          <p>Added -q option which makes the command-line version of Dialyzer
+            a bit more silent.</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.2.0</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Dialyzer works with the open source and commercial versions of Erlang/OTP
+            R10B-2 on all platforms (i.e., HiPE support is not a prerequisite anymore).</p>
+        </item>
+        <item>
+          <p>Whenever a .beam file contains abstract code (i.e., has been compiled
+            with the +debug_info option), the analysis starts from this code rather
+            than from BEAM bytecode -- this makes the results identical to those
+            obtained by analysis starting from source code.
+            (This is a contribution from Bjorn Gustavsson - Thanks!)</p>
+        </item>
+        <item>
+          <p>Added -pa command line option for easier handling of -include_lib()
+            directives in source code.</p>
+        </item>
+        <item>
+          <p>Includes all changes added in v1.1.1; see below.  The "Add Recursively"
+            functionality is also available in the command-line mode (-r option).</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.1.1</title>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+      <list type="bulleted">
+        <item>
+          <p>Fixed problems using the shell script on Solaris machines.</p>
+        </item>
+        <item>
+          <p>Fixed small inconsistencies in Dialyzer's documentation and help.</p>
+        </item>
+      </list>
+    </section>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>The command-line mode of Dialyzer spits discrepancies in stdout
+            by default and returns a numeric value indicating its exit status.</p>
+        </item>
+        <item>
+          <p>Added "Add Recursively" button contributed by Martin Bjorklund (thanks!).</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.1.0</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Dialyzer works with the open source version of Erlang/OTP R10B-1 (on
+            platforms where HiPE support is available) and it does not require
+            installation of a customized Erlang/OTP system anymore.</p>
+        </item>
+        <item>
+          <p>Dialyzer comes with an extensive command-line interface, in addition
+            to an enhanced GUI.</p>
+        </item>
+        <item>
+          <p>Analysis can start from source code (through Core Erlang) as well as
+            from BEAM bytecode.</p>
+        </item>
+        <item>
+          <p>Dialyzer finds considerably more discrepancies in Erlang code than
+            previous versions.</p>
+        </item>
+        <item>
+          <p>Added ability to selectively turn on/off different warning categories.</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.0.1</title>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+      <list type="bulleted">
+        <item>
+          <p>Fixed major bug of v1.0.0 which caused the analysis to stop prematurely
+            (i.e., without properly reaching fixpoint) when analyzing more than one
+            module.  This did not affect correctness of the results, but lost many
+            opportunities to detect discrepancies.</p>
+        </item>
+      </list>
+    </section>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Performance improvements in the analysis.</p>
+        </item>
+      </list>
+    </section>
+  </section>
+
+  <section>
+    <title>Dialyzer 1.0.0</title>
+
+    <section>
+      <title>Improvements and New Features</title>
+      <list type="bulleted">
+        <item>
+          <p>Initial Dialyzer version: Analysis starts from BEAM bytecode only and 
+            only a GUI version is available. Dialyzer reports discrepancies in the
+            use of the "sequential" part of Erlang. To be used, Dialyzer requires
+            the presence of a specific snapshot of Erlang/OTP which can be obtained
+            from Dialyzer's homepage.</p>
+        </item>
+      </list>
+    </section>
+  </section>
+</chapter>
+