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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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Make calls to get_stacktrace/0 future-proof
OTP-14400
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In the future, erlang:get_stacktrace/0 will probably only work
inside a the 'catch' block of a 'try' expression.
Future-proof the code by rewriting the old-style catch to
a try...catch.
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In the future, erlang:get_stacktrace/0 will probably only work
inside a the 'catch' block of a 'try' expression.
Future-proof the code by rewriting the old-style catch to
a try...catch.
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The return value of erlang:get_stacktrace/0 is not defined
when called like this:
try Expr of
Pattern ->
erlang:get_stacktrace()
end
Currently, the stacktrace will be from a random earlier error.
In a future release, it may be [].
Note: We can remove the entire 'case' statement because
CTHReason can never be an atom.
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* sverker/fix-lc-with-lcnt:
erts: Add minor lock optimization for lcnt
erts: Unbreak --enable-lock-checking --enable-lock-counter
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Correct description of nowarn_obsolete_guard
By default, warnings for obsolete guards are turned on. Correct the description to make that clear.
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* ingela/ssl/windows-cuddle:
ssl: Only run sslv2 reject tests on old OpenSSL version
ssl: Try to workaround OpenSSL windows obscurities
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* maint:
Updated OTP version
Prepare release
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* maint-18:
Updated OTP version
Prepare release
Conflicts:
erts/doc/src/notes.xml
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=== OTP-18.2.4.0.1 ===
Changed Applications:
- erts-7.2.1.1
Unchanged Applications:
- asn1-4.0.1
- common_test-1.11.2
- compiler-6.0.2
- cosEvent-2.2
- cosEventDomain-1.2
- cosFileTransfer-1.2
- cosNotification-1.2
- cosProperty-1.2
- cosTime-1.2
- cosTransactions-1.3
- crypto-3.6.2
- debugger-4.1.1
- dialyzer-2.8.2
- diameter-1.11.1
- edoc-0.7.17
- eldap-1.2
- erl_docgen-0.4.1
- erl_interface-3.8.1
- et-1.5.1
- eunit-2.2.12
- gs-1.6
- hipe-3.14
- ic-4.4
- inets-6.1.1
- jinterface-1.6.1
- kernel-4.1.1
- megaco-3.18
- mnesia-4.13.2
- observer-2.1.1
- odbc-2.11.1
- orber-3.8
- os_mon-2.4
- ose-1.1
- otp_mibs-1.1
- parsetools-2.1.1
- percept-0.8.11
- public_key-1.1
- reltool-0.7
- runtime_tools-1.9.2
- sasl-2.6.1
- snmp-5.2.1
- ssh-4.2.1
- ssl-7.2
- stdlib-2.7
- syntax_tools-1.7
- test_server-3.9.1
- tools-2.8.2
- typer-0.9.10
- webtool-0.9
- wx-1.6
- xmerl-1.3.9
* tag 'OTP-18.2.4.0.1':
Updated OTP version
Prepare release
Conflicts:
OTP_VERSION
erts/vsn.mk
otp_versions.table
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* maint:
Updated OTP version
Update release notes
inets: Prepare for release
inets: Mend ipv6_host_with_brackets option
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* maint-18:
Updated OTP version
Update release notes
inets: Prepare for release
inets: Mend ipv6_host_with_brackets option
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* rickard/rq-len/OTP-13201:
Fix testcase
Light weight statistics of run queue lengths
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=== OTP-18.2.4.1 ===
Changed Applications:
- inets-6.1.1.1
Unchanged Applications:
- asn1-4.0.1
- common_test-1.11.2
- compiler-6.0.2
- cosEvent-2.2
- cosEventDomain-1.2
- cosFileTransfer-1.2
- cosNotification-1.2
- cosProperty-1.2
- cosTime-1.2
- cosTransactions-1.3
- crypto-3.6.2
- debugger-4.1.1
- dialyzer-2.8.2
- diameter-1.11.1
- edoc-0.7.17
- eldap-1.2
- erl_docgen-0.4.1
- erl_interface-3.8.1
- erts-7.2.1
- et-1.5.1
- eunit-2.2.12
- gs-1.6
- hipe-3.14
- ic-4.4
- jinterface-1.6.1
- kernel-4.1.1
- megaco-3.18
- mnesia-4.13.2
- observer-2.1.1
- odbc-2.11.1
- orber-3.8
- os_mon-2.4
- ose-1.1
- otp_mibs-1.1
- parsetools-2.1.1
- percept-0.8.11
- public_key-1.1
- reltool-0.7
- runtime_tools-1.9.2
- sasl-2.6.1
- snmp-5.2.1
- ssh-4.2.1
- ssl-7.2
- stdlib-2.7
- syntax_tools-1.7
- test_server-3.9.1
- tools-2.8.2
- typer-0.9.10
- webtool-0.9
- wx-1.6
- xmerl-1.3.9
* tag 'OTP-18.2.4.1':
Updated OTP version
Update release notes
inets: Prepare for release
inets: Mend ipv6_host_with_brackets option
Conflicts:
OTP_VERSION
lib/inets/doc/src/notes.xml
lib/inets/src/inets_app/inets.appup.src
lib/inets/vsn.mk
otp_versions.table
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In the future, erlang:get_stacktrace/0 will probably only work
inside a the 'catch' block of a 'try' expression.
Future-proof the code by rewriting the old-style catch to
a try...catch.
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* siri/system/testcuddle:
Add typer to excluded applications in upgrade_SUITE
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* sverker/ets-select-replace-const:
stdlib: Add examples for ets:select_replace docs
erts: Fix ets:select_replace with {const, NewTuple}
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Enable ets:select_replace to do a generic single object
compare-and-swap operation of any ets-tuple using
a matchspec like this:
[{Old, [], [{const, New}]}]
The only exception when this does not work is if the key
contains maps or atoms looking like variables (like '$1').
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* siri/ct_netconfc/multiple-channels/OTP-14284:
[ct_netconfc] Update documentation
[ct_netconfc] Start multiple sessions per SSH connection
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* ingela/ssl/server-hostname-verify/OTP-14197:
ssl: Add hostname check of server certificate
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Add a test for utf8 function names
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* sverker/is_module_native-trace-bug/OTP-14390:
erts: Fix code:is_module_native for local trace
erts: Move and rename erts_is_native_break()
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* Remove edoc comments in ct_netconfc.erl
* Rewrite ct_netconfc.xml to use specs for functions and types
* Add documentation of new functions in ct_netconfc
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Added vim and atom to doc's front page
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Fix typo in child spec for file_server
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Mend p->fvalue leak
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Error when a non-DST time is passed to the httpd_util:rfc1123_date/1 function
OTP-14394
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The test found a bug in v3_kernel_pp which was not
taking into account utf8 atoms. The bug has also
been fixed.
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Make 'slim' slim again
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The following new functions are added to ct_netconfc:
* connect/1,2 - open an SSH connection to a netconf server
* disconnect/1 - close the given SSH connectoin
* session/1,2,3 - open an SSH channel on the give connection and send
'hello' to start a netconf session.
This allows running multiple channels on on SSH connection, realizing
one netconf session per channel. The existing ct_netconfc:open will
always run one channel(session) per SSH connection.
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'modeules' -> 'modules'
Introduced in 3edc6dbf8f150bb6ba7c800ed5cc379771f8b279 (present in 20.0-rc1, but
not in the 19 release series).
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When the server_name_indication is sent automatize the
clients check of that the hostname is present in the
servers certificate. Currently server_name_indication shall
be on the dns_id format. If server_name_indication is disabled
it is up to the user to do its own check in the verify_fun.
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both together.
Broken in OTP-20.0-rc1 by 7d161f5b475575bd79bd90977b3a79334a8ec658.
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Remove unused variable warning in compile_SUITE
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system/doc/reference_manual/: fix a typo
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Fixed typo.
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This reverts commit 4f03eba5294f1c1bc922b07f1267e6b0099fd4b5.
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This reverts commit dc57404252c47520f352834ad9be45ad684f96c9.
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p->fvalue will be set by BIFs that generate exceptions
(such as throw/1), and it will not be cleared before another
exception is generated. Potentially, p->fvalue may contain a
huge term (e.g. after throw(HugeTerm)) which will be kept in
the heap.
We can shorten the lifetime of f->value by clearing it in
the instructions that handle catches: catch_end and try_end.
That is safe because BEAM code will never access p->fvalue.
If BEAM code needs to rethrow an exception it will use a
reference to the value passed in an X register.
The reason that p->fvalue must not be cleared already in
handle_error() is that native code trap handlers will use
it. (See the comment before handle_error() and the comment
at the end of handle_error() in beam_emu.c for some more
information about exception handling.)
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