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The expression in a bit string comprehension is limited to a
literal bit string expression. That is, the following code
is legal:
<< <<X>> || X <- List >>
but not this code:
<< foo(X) || X <- List >>
The limitation is annoying. For one thing, tools that transform
the abstract format must be careful not to produce code such as:
<< begin
%% Some instrumentation code.
<<X>>
end || X <- List >>
One reason for the limitation could be that we'll get
reduce/reduce conflicts if we try to allow an arbitrary
expression in a bit string comprehension:
binary_comprehension -> '<<' expr '||' lc_exprs '>>' :
{bc,?anno('$1'),'$2','$4'}.
Unfortunately, there does not seem to be an easy way to work
around that problem. The best we can do is to allow 'expr_max'
expressions (as in the binary syntax):
binary_comprehension -> '<<' expr_max '||' lc_exprs '>>' :
{bc,?anno('$1'),'$2','$4'}.
That will work, but functions calls must be enclosed in
parentheses:
<< (foo(X)) || X <- List >>
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For a long time, users have asked for one or more macros that would
return the name and arity of the current function.
We could define a single ?FUNCTION macro that would return
a {Name,Arity} tuple. However, to access just the name or
just the arity for the function, element/2 must be used.
That would limit its usefulness, because element/2 is not
allowed in all contexts.
Therefore, it seems that we will need two macros.
?FUNCTION_NAME that expands to the name of the current function
and ?FUNCTION_ARITY that expands to arity of the current
function.
Converting the function name to a string can be done like this:
f() ->
atom_to_list(?FUNCTION_NAME) ++ "/" ++
integer_to_list(?FUNCTION_ARITY).
f/0 will return "f/0". The BEAM compiler will evaluate the
entire expression at compile-time, so there will not be
any run-time penalty for the function calls.
The implementation is non-trivial because the preprocessor is
run before the parser.
One way to implement the macros would be to replace them with some
placeholder and then let the parser or possibly a later pass replace
the placeholder with correct value. That could potentially slow
down the compiler and cause incompatibilities for parse transforms.
Another way is to let the preprocessor do the whole job. That means
that the preprocessor will have to scan the function head to find
out the name and arity. The scanning of the function head can be
delayed until the first occurrence of a ?FUNCTION_NAME or
?FUNCTION_ARITY.
I have chosen the second way because it seems less likely to cause
weird compatibility problems.
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It is harder to remove is_subtype from the parser since the abstract
format does not separate is_subtype from the '::' syntax.
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* legoscia/patch-2:
Remove mention of erlang:fault
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* essen/weird-strncmp-len:
Fix weird strncmp length in erl_interface example
OTP-13081
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erlang:fault no longer exists, so don't mention it in the reference manual.
Also fix minor markup issue in following paragraph.
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* gomoripeti/bindoc_fix:
Very minor fixes to binary handling documentation
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* entropiae/patch-1:
Fixed typo in otp design principles
OTP-13017
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- at appending when allocating new binary object its size will be
double (the old size + size of data to be appended)
not just double the old size
- correct some unused byte counts
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Language cleaned up by the technical writer tmanevik from
Combitech. Proofreading and corrections by Björn Gustavsson.
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* richcarl/md5-fixes:
Set module_info md5 for native modules properly
Add module_info entry for native code
Gracefully handle empty md5 field in module_info
Remove 'imports' key from spec of get_module_info()
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Use the md5 of the native code chunk instead of the Beam code md5.
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* rickard/time_api/OTP-11997: (22 commits)
Update primary bootstrap
inets: Suppress deprecated warning on erlang:now/0
inets: Cleanup of multiple copies of functions Add inets_lib with common functions used by multiple modules
inets: Update comments
Suppress deprecated warning on erlang:now/0
Use new time API and be back-compatible in inets Remove unused functions and removed redundant test
asn1 test SUITE: Eliminate use of now/0
Disable deprecated warning on erlang:now/0 in diameter_lib
Use new time API and be back-compatible in ssh
Replace all calls to now/0 in CT with new time API functions
test_server: Replace usage of erlang:now() with usage of new API
Replace usage of erlang:now() with usage of new API
Replace usage of erlang:now() with usage of new API
Replace usage of erlang:now() with usage of new API
Replace usage of erlang:now() with usage of new API
otp_SUITE: Warn for calls to erlang:now/0
Replace usage of erlang:now() with usage of new API
Multiple timer wheels
Erlang based BIF timer implementation for scalability
Implement ethread events with timeout
...
Conflicts:
bootstrap/bin/start.boot
bootstrap/bin/start_clean.boot
bootstrap/lib/compiler/ebin/beam_asm.beam
bootstrap/lib/compiler/ebin/compile.beam
bootstrap/lib/kernel/ebin/auth.beam
bootstrap/lib/kernel/ebin/dist_util.beam
bootstrap/lib/kernel/ebin/global.beam
bootstrap/lib/kernel/ebin/hipe_unified_loader.beam
bootstrap/lib/kernel/ebin/inet_db.beam
bootstrap/lib/kernel/ebin/inet_dns.beam
bootstrap/lib/kernel/ebin/inet_res.beam
bootstrap/lib/kernel/ebin/os.beam
bootstrap/lib/kernel/ebin/pg2.beam
bootstrap/lib/stdlib/ebin/dets.beam
bootstrap/lib/stdlib/ebin/dets_utils.beam
bootstrap/lib/stdlib/ebin/erl_tar.beam
bootstrap/lib/stdlib/ebin/escript.beam
bootstrap/lib/stdlib/ebin/file_sorter.beam
bootstrap/lib/stdlib/ebin/otp_internal.beam
bootstrap/lib/stdlib/ebin/qlc.beam
bootstrap/lib/stdlib/ebin/random.beam
bootstrap/lib/stdlib/ebin/supervisor.beam
bootstrap/lib/stdlib/ebin/timer.beam
erts/aclocal.m4
erts/emulator/beam/bif.c
erts/emulator/beam/erl_bif_info.c
erts/emulator/beam/erl_db_hash.c
erts/emulator/beam/erl_init.c
erts/emulator/beam/erl_process.h
erts/emulator/beam/erl_thr_progress.c
erts/emulator/beam/utils.c
erts/emulator/sys/unix/sys.c
erts/preloaded/ebin/erlang.beam
erts/preloaded/ebin/erts_internal.beam
erts/preloaded/ebin/init.beam
erts/preloaded/src/erts_internal.erl
lib/common_test/test/ct_hooks_SUITE_data/cth/tests/empty_cth.erl
lib/diameter/src/base/diameter_lib.erl
lib/kernel/src/os.erl
lib/ssh/test/ssh_basic_SUITE.erl
system/doc/efficiency_guide/advanced.xml
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The old time API is based on erlang:now/0. The major issue with
erlang:now/0 is that it was intended to be used for so many
unrelated things. This tied these unrelated operations together
and unnecessarily caused performance, scalability as well as
accuracy, and precision issues for operations that do not need
to have such issues. The new API spreads different functionality
over multiple functions in order to improve on this.
The new API consists of a number of new BIFs:
- erlang:convert_time_unit/3
- erlang:monotonic_time/0
- erlang:monotonic_time/1
- erlang:system_time/0
- erlang:system_time/1
- erlang:time_offset/0
- erlang:time_offset/1
- erlang:timestamp/0
- erlang:unique_integer/0
- erlang:unique_integer/1
- os:system_time/0
- os:system_time/1
and a number of extensions of existing BIFs:
- erlang:monitor(time_offset, clock_service)
- erlang:system_flag(time_offset, finalize)
- erlang:system_info(os_monotonic_time_source)
- erlang:system_info(time_offset)
- erlang:system_info(time_warp_mode)
- erlang:system_info(time_correction)
- erlang:system_info(start_time)
See the "Time and Time Correction in Erlang" chapter of the
ERTS User's Guide for more information.
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* hb/doc/fix_links:
Correct links in the system documentation
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* maint:
Minor fixes
Conflicts:
system/doc/system_principles/versions.xml
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* maint:
Add support for patching of individual applications
Conflicts:
system/doc/installation_guide/part.xml
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We no longer use the term "lambda".
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It is hardly useful to mention that funs used to be represented
as tuples in ancient releases.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Hans Bolinder.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Hans Bolinder.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Hans Bolinder.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Hans Bolinder.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson.
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* Fix documentation on $char for unicode
* Remove duplicate declaration for erts_encode_ext_dist_header_size
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Removed false example from fun_test.erl
Removed unused code from fun_test.erl
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