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The following code could fail in the call to list_existing_atom/1:
String = atom_to_list(some_atom),
Atom = list_to_existing_atom(String)
because the compiler will rewrite the code to:
String = "some_atom",
Atom = list_to_existing_atom(String)
If some_atom is not used in another place, it will not exist.
The compiler could be updated to preserve the atom in this simple case,
but it would be hard to make sure that the compiler never loses atoms
that exist in the source text. It also difficult to imagine a
real world use case where this would be a problem. If an atom is
mentioned only in a way that the compiler can optimize away, is there
really any need to create the atom at all in list_to_existing_atom/1?
Therefore, it is better to place the responsibility that the atom exists
on the user of list_to_existing_atom/1. Update the documentation to
mention that the compiler may optimize away atoms.
https://bugs.erlang.org/browse/ERL-453
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OTP-14520
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OTP-14520
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* sverker/halt-unicode-slogan/OTP-14553:
erts: Allow any unicode string as crash dump slogan
erts: Generate crash_dump slogan string as UTF8
erts: Refactor erts_unicode_list_to_buf
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i.e the first argument to erlang:halt
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* maint-19:
Updated OTP version
Update release notes
Update version numbers
Fix statistics(wall_clock) and statistics(runtime) implementation
fixup! erts: Cleanup dropped port tasks correctly
erts: Add tests to detect port close race
Add a testcase for OTP-13939/ERL-193
erts: Cleanup dropped port tasks correctly
Mark socket disconnected on tcp_send_or_shutdown_error
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OTP-14152
* rickard/ds-runqs:
Make statistics/1 aware of dirty run-queues and tasks
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erlang:get_stacktrace/0 returns the stacktrace for the latest
exception. The problem is that the stacktrace is kept until the next
exception occurs. If the last exception was a 'function_clause' or a
'badarg', the arguments for the call are also kept forever. The
arguments can be terms of any size (potentially huge).
In a future release, we would like to only allow
erlang:get_stacktrace/0 from within a 'try' expression. That would
make it possible to clear the stacktrace when the 'try' expression is
exited.
The 'catch' expression has no natural end where the stacktrace could
be cleared. The stacktrace could be cleared at the end of the function
that the 'catch' occurs in, but that would cause problems in the
following scenario (from real life, but simplified):
try
...
catch _:_ ->
io:format(...),
io:format("~p\n", [erlang:get_stacktrace()])
end.
%% In io.erl.
format(Fmt, Args) ->
Res = case ... of
SomePattern ->
catch...
...;
SomeOtherPattern ->
%% Output the formatted string here
...
end,
clear_stacktrace(), %% Inserted by compiler.
Res.
The call to io:format() would always clear the stacktrace before
it could be retrieved.
That problem could be solved by tightning the scope in which the
stacktrace is kept, but the rules for how long erlang:get_stacktrace/0
would work would become complicated.
Therefore, the solution we suggest for a future major release of
OTP is that erlang:get_stacktrace/0 will return [] if it is called
outside the 'catch' part of a 'try' expression.
To help users prepare, introduce a warning when it is likely that
erlang:get_stacktrace/0 will always return an empty list, for example
in this code:
catch error(foo),
Stk = erlang:get_stacktrace()
or in this code:
try Expr
catch _:_ -> ok end,
Stk = erlang:get_stacktrace()
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Correct id for 7b419c0a38bd4db: OTP-14234
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* egil/remove-warnings/OTP-14180:
erts: Remove unnecessary warnings
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* josevalim/atu8-chunk/PR-1078/OTP-14178:
Add new AtU8 beam chunk
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The new chunk stores atoms encoded in UTF-8.
beam_lib has also been modified to handle the new
'utf8_atoms' attribute while the 'atoms' attribute
may be a missing chunk from now on.
The binary_to_atom/2 BIF can now encode any utf8
binary with up to 255 characters.
The list_to_atom/1 BIF can now accept codepoints
higher than 255 with up to 255 characters (thanks
to Björn Gustavsson).
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The BIF process_info(Pid, current_stacktrace) truncates the
stacktrace. The old behavior was to truncate long stacktraces to max
8 items. And this was hard coded. Now it is truncated to the value of
system_flag(backtrace_depth) instead. The backtrace_depth defaults to
8, but is configurable.
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* maint:
Update preloaded
erts: Correct type declaration of match specification head
Conflicts:
erts/preloaded/ebin/erlang.beam
erts/preloaded/ebin/erts_internal.beam
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Bug reported by Peti Gömöri <[email protected]>.
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* gsantomaggio/erts/system_info_atoms/PR-1198/OTP-13976:
erts: Fix some system_info docs inconsistencies
Add system_info(atom_limit)
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Add system_info(atom_limit) to provide a way to retrieve the maximum
number of atoms allowed. Add tests and documentation for it too.
Also split system_info_SUITE:start_node/2 to start_node_ets/2 and
start_node_atm/2 to avoid code duplication.
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and instead let erlang:load_nif/2 return {error, {reload, _}}
before even trying to load the library
if a NIF library has already been successfully loaded
for the calling module instance.
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* kvakvs/erts/gc_minor_option/OTP-11695:
erts: Fix req_system_task gc typespec
Fix process_SUITE system_task_blast and no_priority_inversion2
Option to erlang:garbage_collect to request minor (generational) GC
Conflicts:
erts/emulator/beam/erl_process.c
erts/preloaded/src/erts_internal.erl
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Implement as ceil/1 and floor/1 as new guard BIFs (essentially part of
Erlang language). They are guard BIFs because trunc/1 is a guard
BIF. It would be strange to have trunc/1 as a part of the language, but
not ceil/1 and floor/1.
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Fix some older errors as well.
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* rickard/time-unit/OTP-13735:
Update test-cases to use new symbolic time units
Replace misspelled symbolic time units
Conflicts:
erts/doc/src/erlang.xml
erts/emulator/test/long_timers_test.erl
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'rickard/new-purge-strategy/OTP-13833' into maint
* rickard/fun-purge-bug/OTP-13809:
Fix purge of code
Reclaim literal area after purge has completed
Separate literal area from code
Conflicts:
erts/doc/src/erlang.xml
erts/emulator/beam/beam_bif_load.c
erts/emulator/beam/erl_init.c
erts/preloaded/ebin/init.beam
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Ensure that we cannot get any dangling pointers into code that
has been purged. This is done by a two phase purge. At first
phase all fun entries pointing into the code to purge are marked
for purge. All processes trying to call these funs will be suspended
and by this we avoid getting new direct references into the code.
When all processes has been checked, these processes are resumed.
The new purge strategy now also completely ignore the existence of
indirect references to the code (funs). If such exist, they will
cause bad fun exceptions to the caller, but will not prevent a
soft purge or cause a kill of a process having such live references
during a hard purge. This since it is impossible to give any
guarantees that no processes in the system have such indirect
references. Even when the system is completely clean from such
references, new ones can appear via distribution and/or disk.
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Besides using two words for 'milliseconds' et. al. they are
also changed from plural to singular.
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Note: Minor GC option is a hint, and GC may still decide to run fullsweep.
Test case for major and minor gc on self
Test case for major and minor gs on some other process + async gc test check
docs fix
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