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For the PER backends, generate code for accessing deep table
constraints at compile-time in the same way as is done for BER.
While at it, remove the complicated indentation code.
Also modernize the test suite and add a test for a deeper nested
constraint.
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The name of the referenced object set name in #simpletableattributes{}
would when used by INSTANCE OF be an atom, but in all other cases
be a {Module,ObjectSetName} tuple. Simplify the code by always using
the latter format.
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An ENUMERATED is always represented as a two-tuple, never as
three-tuple.
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asn1ct_constructed_per:gen_encode_prim_wrapper() no longer serves
any useful purpose, as it is easier to call
asn1ct_per:gen_encode_prim() directly. Also, the DoTag argument
for asn1ct_per:gen_encode_prim() is never actually used, so it can
be eliminated at the same time.
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The last clause in asn1ct_gen:type/1 does a catched call to type2/1.
If the type2/1 fails {notype,X} is returned.
Since the body of type2/1 essentially is:
case lists:member(X, [...]) of
true ->
{primitive,bif};
false ->
case lists:member(X, [...]) of
true ->
{constructed,bif};
false ->
{undefined,user}
end
end
there is no way that type2/1 can fail. Therefore, we can eliminate
the catch and put the body of type2/1 into the last clause of
type/1. We can also eliminate the code in the callers of type/1
that match {notype,X}.
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Hiding the details of decoding an external type will facilitate
changing the calling convention in a future commit.
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The record #typereference{} is only used internally within
the asn1ct_parser2 module (the parser translates it to
an #'Externaltypereference{} record).
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Improve readability and maintainability.
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Optimize the decoding of CHOICE. Most important is to inline decoding
of the extension bit (if present) and decoding of the choice index
to give the BEAM compiler more opportunities for optimization.
We will also change the structure of the generated code. The current
code uses a flattened case for both the root and extension alternatives:
case Choice + NumRootChoices * Ext of
%% Root alternatives.
0 - ...;
:
LastRootAlternative -> ...;
%% Extension alternatives.
LastRootAlternative+1 -> ...;
:
%% Unknown extension.
_ -> ...;
end
We will instead generate nested cases:
case Ext of
0 ->
case Choice of
%% Root alternatives.
0 - ...;
:
LastRootAlternative -> ...
end;
1 ->
%% Extension alternatives.
<Decode the open type here>
case Choice of
0 -> ...;
:
LastExtensionAlternative -> ...;
%% Unknown extension.
_ -> ...;
end
end
Nested cases should be slightly faster. For decoding of the extensions,
it also makes it possible to hoist the decoding of the open type up
from each case to before the case switching on the extension index,
thus reducing the size of the generated code.
We will also do another change to the structure. Currently, the
big flat clase is wrapped in code that repackages the return values:
{Alt,{Value,RemainingEncodedData}} =
case Choice + NumRootChoices * Ext of
:
end,
{{Value,Alt},RemainingEncodedData}.
We still need to do the repackaging, but we can push it down to
the case arm for decoding each alternative. In many cases, that
will give the BEAM compiler the opportunity to avoid building the
temporary tuples.
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We will need more explicit control of decoding of open types for
CHOICEs, so refactor the gen_dec_line() and gen_dec_line_imm()
to break out the decoding of the open types.
Note that gen_dec_line_special() will not generate correct code
if Ext =/= noext; thus, we can eliminate the Ext parameter.
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gen_dec_choice2() is unnecessarily complicated. Code is duplicated
merely to avoid outputting a ";" separator after the last item,
and there is code to skip extensionmarks that are never actually
present.
While at it, eliminate the the wrap_gen_dec_line() function which is
not needed. It puts a {component_type,C} key in the process
dictionary, but that is actually never used. Besides that, it only
shuffles the argument.
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gen_enc_choice2() duplicates code merely to avoid outputting a ";"
separator after the last item.
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Ensure that asn1ct_name:start/0 will call asn1ct_name:clear/0 if the
name server process is already running so that we can be sure that
the variables are cleared.
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The template modules (asn1rtt_*.erl) are based on the existing
run-time modules, but with some simplifications and improvements,
for example:
The run-time functions for BER encoding took a Constraint argument which
was not used. It has been eliminated, along with the unused StringType
argument for the encode_restricted_string function.
The Range argument for decode_enumerated() has been dropped since it
was not used.
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* bjorn/asn1/extension-addition-groups/OTP-10664:
Fix a bug for multiple extension addition groups
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Encoding would fail.
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Extensions following a double bracket group were not skipped correctly.
Fix this bug and add tests to ensure that extensions are skipped
correctly.
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In order to optimize the generated code, we will need data structures
that can be traversed in several passes before the actual code is
generated.
Refactor the code so that if first builds (essentially) a list of
funs that do the actual code generation, and a second function
that will call the funs one at the time.
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A long term goal is to eleminate the asn1ct_gen_per_rt2ct module
in favor of the asn1ct_gen_per module, so will have
asn1ct_gen_per_rt2ct call asn1ct_gen_per.
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Currently, the generated code suppresses warnings for unusued variables
by assigning to the "_Val" variable, for example:
_Val = Tmpval5
To be completely safe, that should have been:
_ = Tmpval5
in case there happens to more than one such assignment in the same
scope.
However, a better way to suppress warnings is to simply use the
'nowarn_unused_vars' compiler option. That method will also work
for more complicated expressions there it would be cumbersome to
suppress warnings by assignment to "_".
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It is time to clean up the mess of back-ends.
Remove all the obsolete back-ends and simplify the options used
to select them.
New Option Old Equivalent
---------- --------------
ber ber_bin,optimize,nif
per per,optimize,nif
uper uper_bin
The old options will still be recognized and translated to the
new options, but will also print a warning.
That implies that deprecated features that only are implemented
in the old 'ber' back-end will no longer work (e.g. the
{Typename,Value} notation).
Also make the return type for the generated encode/2 function
consistent. It used to be a binary for per and uper, and an iolist
for ber. Always make it a binary.
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Of the back-ends that we are going to keep, only the UPER back-end
support the obsolete {Typename,Value} notation. For consistency
with the PER and BER encodings, remove the support for UPER
encoding too. Also remove vestiges of the support for the
notation in the other back-ends.
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Handle the new error messages from the asn1 nifs
Remove dead code for erlang optimized per decode
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Instead of looping over the list of which options contain defaults, one case statement is generated for each optional attribute.
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than runtime
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than runtime
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