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Diffstat (limited to 'lib/compiler/doc/src/notes.xml')
| -rw-r--r-- | lib/compiler/doc/src/notes.xml | 285 |
1 files changed, 282 insertions, 3 deletions
diff --git a/lib/compiler/doc/src/notes.xml b/lib/compiler/doc/src/notes.xml index e25cdc580c..f3d42a909b 100644 --- a/lib/compiler/doc/src/notes.xml +++ b/lib/compiler/doc/src/notes.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2004</year><year>2016</year> + <year>2004</year><year>2017</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -32,6 +32,285 @@ <p>This document describes the changes made to the Compiler application.</p> +<section><title>Compiler 7.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p>For many releases, it has been legal to override a BIF + with a local function having the same name. However, + calling a local function with the same name as guard BIF + as filter in a list comprehension was not allowed.</p> + <p> + Own Id: OTP-13690</p> + </item> + <item> + <p>compile:forms/2 would not return the module name as + documented when one of the options '<c>from_core</c>', + '<c>from_asm</c>', or '<c>from_beam</c>' was given. Also, + the compiler would crash if one of those options was + combined with '<c>native</c>'.</p> + <p> + Own Id: OTP-14408 Aux Id: ERL-417 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Optimized test for tuples with an atom as first element.</p> + <p> + Own Id: OTP-12148</p> + </item> + <item> + <p> + Compilation of modules with huge literal binary strings + is now much faster.</p> + <p> + Own Id: OTP-13794</p> + </item> + <item> + <p>Replaced usage of deprecated symbolic <seealso + marker="erts:erlang#type-time_unit"><c>time + unit</c></seealso> representations.</p> + <p> + Own Id: OTP-13831 Aux Id: OTP-13735 </p> + </item> + <item> + <p>The undocumented and unsupported module + <c>sys_pre_expand</c> has been removed. As a partial + replacement for the functionality, there is a new + function <c>erl_internal:add_predefined_functions/1</c> + and <c>erl_expand_records</c> will now add a module + prefix to calls to BIFs and imported functions.</p> + <p> + Own Id: OTP-13856</p> + </item> + <item> + <p>The internal compiler passes now start all generated + variables with "@" to avoid any conflicts with variables + in languages such as Elixir or LFE.</p> + <p> + Own Id: OTP-13924</p> + </item> + <item> + <p>The function <c>fmod/2</c> has been added to the + <c>math</c> module.</p> + <p> + Own Id: OTP-14000</p> + </item> + <item> + <p>Code generation for complicated guards have been + improved.</p> + <p> + Own Id: OTP-14042</p> + </item> + <item> + <p> + The compiler has new warnings for repeated identical map + keys.</p> + <p> + A map expression such as,</p> + <p> + <c> #{'a' => 1, 'b' => 2, 'a' => 3}.</c></p> + <p> + will produce a warning for the repeated key 'a'.</p> + <p> + Own Id: OTP-14058</p> + </item> + <item> + <p>By default, there will now be a warning when + <c>export_all</c> is used. The warning can be disabled + using <c>nowarn_export_all</c>.</p> + <p> + Own Id: OTP-14071</p> + </item> + <item> + <p> + Optimize maps pattern matching by only examining the + common keys in each clause first instead of all keys. + This will reduce the number of lookups of each key in + maps pattern matching.</p> + <p> + Own Id: OTP-14072</p> + </item> + <item> + <p>There is a new '<c>deterministic</c>' option to omit + '<c>source</c>' and '<c>options</c>' tuples in the BEAM + file.</p> + <p> + Own Id: OTP-14087</p> + </item> + <item> + <p> + Analyzing modules with binary construction with huge + strings is now much faster. The compiler also compiles + such modules slightly faster.</p> + <p> + Own Id: OTP-14125 Aux Id: ERL-308 </p> + </item> + <item> + <p>Atoms may now contain arbitrary Unicode + characters.</p> + <p> + Own Id: OTP-14178</p> + </item> + <item> + <p><c>compile:file/2</c> now accepts the option + <c>extra_chunks</c> to include extra chunks in the BEAM + file.</p> + <p> + Own Id: OTP-14221</p> + </item> + <item> + <p>The format of debug information that is stored in BEAM + files (when <c>debug_info</c> is used) has been changed. + The purpose of the change is to better support other + BEAM-based languages such as Elixir or LFE.</p> + <p>All tools included in OTP (dialyzer, debugger, cover, + and so on) will handle both the new format and the + previous format. Tools that retrieve the debug + information using <c>beam_lib:chunk(Beam, + [abstract_code])</c> will continue to work with both the + new and old format. Tools that call + <c>beam_lib:chunk(Beam, ["Abst"])</c> will not work with + the new format.</p> + <p>For more information, see the description of + <c>debug_info</c> in the documentation for + <c>beam_lib</c> and the description of the + <c>{debug_info,{Backend,Data}}</c> option in the + documentation for <c>compile</c>.</p> + <p> + Own Id: OTP-14369 Aux Id: PR-1367 </p> + </item> + <item> + <p>In a future release, <c>erlang:get_stacktrace/0</c> + will probably only work when called from within a + '<c>try</c>' expression (otherwise it will return + <c>[]</c>.</p> + <p>To help prepare for that change, the compiler will now + by default warn if '<c>get_stacktrace/0</c>' is used in a + way that will not work in the future. Note that the + warning will not be issued if '<c>get_stacktrace/0</c>' + is used in a function that uses neither '<c>catch</c>' + nor '<c>try</c>' (because that could be a legal use if + the function is called from within a '<c>try</c>'.</p> + <p> + Own Id: OTP-14401</p> + </item> + </list> + </section> + +</section> + +<section><title>Compiler 7.0.4</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Minor internal changes. A typo in the documentation was + also fixed.</p> + <p> + Own Id: OTP-14240</p> + </item> + </list> + </section> + +</section> + +<section><title>Compiler 7.0.3</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed a compiler crash when maps were matched.</p> + <p> + Own Id: OTP-13931 Aux Id: ERL-266 </p> + </item> + <item> + <p> + Fixed a compiler crash having to with the delayed + sub-creation optimization. (Thanks to Jose Valim for + reporting this bug.)</p> + <p> + Own Id: OTP-13947 Aux Id: ERL-268 </p> + </item> + <item> + <p>The compiler option <c>inline_list_funcs</c> + accidentally turned off some other optimizations.</p> + <p> + Own Id: OTP-13985</p> + </item> + <item> + <p>The compiler could sometimes generate spurious + warnings when inlining was enabled.</p> + <p> + Own Id: OTP-14040 Aux Id: ERL-301 </p> + </item> + </list> + </section> + +</section> + +<section><title>Compiler 7.0.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + If the compiler fails to write the BEAM file, it will now + report the reason of the error for the write operation.</p> + <p> + Own Id: OTP-13701</p> + </item> + <item> + <p> + Fixed an internal compiler error. (Thanks to Svilen + Ivanov for reporting this bug.)</p> + <p> + Own Id: OTP-13780 Aux Id: ERL-202 </p> + </item> + <item> + <p> + The compiler could crash when trying to compile a + complicated expression with multiple catches all on one + line . (Thanks to Thomas Arts for reporting this bug.)</p> + <p> + Own Id: OTP-13804 Aux Id: ERL-209 </p> + </item> + <item> + <p> + Eliminated a few internal compiler failures.</p> + <p> + Own Id: OTP-13863</p> + </item> + </list> + </section> + +</section> + +<section><title>Compiler 7.0.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + A literal binary matching regression was introduced in + 19.0 where a match could fail to resolve to the right + clause. This has now been fixed.</p> + <p> + Own Id: OTP-13738</p> + </item> + </list> + </section> + +</section> + <section><title>Compiler 7.0</title> <section><title>Fixed Bugs and Malfunctions</title> @@ -263,7 +542,7 @@ <item> <p> The <c>cerl</c> and <c>cerl_trees</c> modules in the - <c>compiler</c> application are now documented.</p> + Compiler application are now documented.</p> <p> Own Id: OTP-11978</p> </item> @@ -1965,7 +2244,7 @@ <c>RightExpr</c> or vice versa. The evaluation order is only important if the expressions contains and/or depends on operations with side-effects, such as message passing - or <c>ets</c> operations.</p> + or ETS operations.</p> <p> Own Id: OTP-7206</p> </item> |