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authorErlang/OTP <[email protected]>2014-04-07 19:52:48 +0200
committerErlang/OTP <[email protected]>2014-04-07 19:52:48 +0200
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<p>This document describes the changes made to the Compiler
application.</p>
+<section><title>Compiler 5.0</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Line numbers would not be correct when a binary
+ construction such as
+ '<c>&lt;&lt;Bin/binary,...&gt;&gt;</c>' fails. (Thanks to
+ Stanislav Seletskiy for reporting this bug.)</p>
+ <p>
+ Own Id: OTP-11572</p>
+ </item>
+ <item>
+ <p>
+ The compiler now properly annotates the code in value in
+ the '<c>after</c>' clause for a '<c>try</c>' so that
+ Dialyzer no longer generates a false warning for an
+ unmatched return.</p>
+ <p>
+ Own Id: OTP-11580</p>
+ </item>
+ <item>
+ <p>
+ Some case statements where no clause would match could
+ cause an internal error in the compiler. (Thanks to Erik
+ Soe Sorensen for reporting this bug.)</p>
+ <p>
+ Own Id: OTP-11610</p>
+ </item>
+ <item>
+ <p>
+ With <c>--Wunmatched_returns</c>, dialyzer will no longer
+ warn when the value of a list comprehension is ignored,
+ provided that the each value in the list would be an
+ atomic value (such as integer or atoms, as opposed to
+ tuples and lists). Example: ignoring '<c>[io:format(...)
+ || ...]</c>' will not cause a warning, while ignoring
+ '<c>[file:close(Fd) || ...]</c>' will.</p>
+ <p>
+ Own Id: OTP-11626</p>
+ </item>
+ <item>
+ <p>
+ Matching out a binary and applying the binary as if it
+ were a fun would crash the run-time system. (Thanks to
+ Loïc Hoguin.)</p>
+ <p>
+ Own Id: OTP-11672</p>
+ </item>
+ <item>
+ <p>
+ Some local implementations of removing the last element
+ from a list are replaced by <c>lists:droplast/1</c>. Note
+ that this requires at least <c>stdlib-2.0</c>, which is
+ the stdlib version delivered in OTP 17.0. (Thanks to Hans
+ Svensson)</p>
+ <p>
+ Own Id: OTP-11678</p>
+ </item>
+ <item>
+ <p>
+ Allow all auto imports to be suppressed at once.
+ Introducing the no_auto_import attribute:
+ -compile(no_auto_import). Useful for code generation
+ tools that always use the qualified function names and
+ want to avoid the auto imported functions clashing with
+ local ones. (Thanks to José Valim.)</p>
+ <p>
+ Own Id: OTP-11682</p>
+ </item>
+ <item>
+ <p>
+ Application upgrade (appup) files are corrected for the
+ following applications: </p>
+ <p>
+ <c>asn1, common_test, compiler, crypto, debugger,
+ dialyzer, edoc, eldap, erl_docgen, et, eunit, gs, hipe,
+ inets, observer, odbc, os_mon, otp_mibs, parsetools,
+ percept, public_key, reltool, runtime_tools, ssh,
+ syntax_tools, test_server, tools, typer, webtool, wx,
+ xmerl</c></p>
+ <p>
+ A new test utility for testing appup files is added to
+ test_server. This is now used by most applications in
+ OTP.</p>
+ <p>
+ (Thanks to Tobias Schlager)</p>
+ <p>
+ Own Id: OTP-11744</p>
+ </item>
+ <item>
+ <p>
+ Adapt 'asm' deprecation message to new version scheme.
+ (Thanks to Tuncer Ayaz)</p>
+ <p>
+ Own Id: OTP-11751</p>
+ </item>
+ <item>
+ <p>
+ A number of compiler errors where unusual or nonsensical
+ code would crash the compiler have been reported by Ulf
+ Norell and corrected by Anthony Ramine.</p>
+ <p>
+ Own Id: OTP-11770</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Compilation times for modules with a huge number for
+ record accesses using the dot operator has been improved.</p>
+ <p>
+ Own Id: OTP-10652</p>
+ </item>
+ <item>
+ <p>
+ The compiler can generate somewhat better code by moving
+ let expressions into sequences. (Thanks to Anthony
+ Ramine.)</p>
+ <p>
+ Own Id: OTP-11056</p>
+ </item>
+ <item>
+ <p>
+ Forbid unsized fields in patterns of binary generators
+ and simplified v3_core's translation of bit string
+ generators. (Thanks to Anthony Ramine.)</p>
+ <p>
+ Own Id: OTP-11186</p>
+ </item>
+ <item>
+ <p>
+ Funs can now be a given a name. Thanks to to Richard
+ O'Keefe for the idea (EEP37) and to Anthony Ramine for
+ the implementation.</p>
+ <p>
+ Own Id: OTP-11537</p>
+ </item>
+ <item>
+ <p>
+ Using the <c>from_asm</c> option to produce a BEAM file
+ starting from BEAM assembly code would often fail because
+ early optimization passes would not understand
+ instructions that later optimization passes would
+ introduce. (Thanks to Anthony Ramine.)</p>
+ <p>
+ Own Id: OTP-11544</p>
+ </item>
+ <item>
+ <p>
+ The <c>.core</c> and <c>.S</c> extensions are now
+ documented in the <c>erlc</c> documentation, and the
+ '<c>from_core</c>' and '<c>from_asm</c>' options are now
+ documented in the compiler documentation. (Thanks to
+ Tuncer Ayaz.)</p>
+ <p>
+ Own Id: OTP-11547</p>
+ </item>
+ <item>
+ <p>Optimization of case expressions that build tuples or
+ lists have been improved.</p>
+ <p>
+ Own Id: OTP-11584</p>
+ </item>
+ <item>
+ <p>
+ EEP43: New data type - Maps</p>
+ <p>
+ With Maps you may for instance: <taglist> <item><c>M0 =
+ #{ a =&gt; 1, b =&gt; 2}, % create
+ associations</c></item> <item><c>M1 = M0#{ a := 10 }, %
+ update values</c></item> <item><c>M2 = M1#{ "hi" =&gt;
+ "hello"}, % add new associations</c></item> <item><c>#{
+ "hi" := V1, a := V2, b := V3} = M2. % match keys with
+ values</c></item> </taglist></p>
+ <p>
+ For information on how to use Maps please see the
+ <seealso marker="doc/reference_manual:maps">Reference
+ Manual</seealso>.</p>
+ <p>
+ The current implementation is without the following
+ features: <taglist> <item>No variable keys</item>
+ <item>No single value access</item> <item>No map
+ comprehensions</item> </taglist></p>
+ <p>
+ Note that Maps is <em>experimental</em> during OTP 17.0.</p>
+ <p>
+ Own Id: OTP-11616</p>
+ </item>
+ <item>
+ <p>
+ Some function specs are corrected or moved and some edoc
+ comments are corrected in order to allow use of edoc.
+ (Thanks to Pierre Fenoll)</p>
+ <p>
+ Own Id: OTP-11702</p>
+ </item>
+ <item>
+ <p>
+ Thanks to Anthony Ramine for several improvements to the
+ optimizations in the BEAM compiler and for cleaning up
+ the code the code that transforms list and binary
+ comprehensions to Core Erlang.</p>
+ <p>
+ Own Id: OTP-11720</p>
+ </item>
+ <item>
+ <p>
+ The default encoding for Erlang source files is now
+ UTF-8. As a temporary measure to ease the transition from
+ the old default of latin-1, if the compiler encounters
+ byte sequences that are not valid UTF-8 sequences, the
+ compiler will re-try the compilation in latin-1 mode.
+ This workaround will be removed in a future release.</p>
+ <p>
+ Own Id: OTP-11791</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Compiler 4.9.4</title>
<section><title>Fixed Bugs and Malfunctions</title>