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The generated code for table constraints has several problems:
* For each object set, a function for getting an encoding or decoding
fun is generated, regardless of whether it is actually used. In many
specifications, the object set actually used is the union of several
other object sets. That means that the code can become a lot bulkier
than it would need to be.
* The funs are not necessary. The funs just add to the code bloat
and generate more unnecessary garbage at run-time. Also, one of
the arguments of the fun is the name of the field in the class which
is known at compile-time, and the fun for decoding has unused arguments.
How to fix the problems:
At each call site where an open type should be encoded/decoded, call a
specific generated function specialized for the actual object set and
the name of the field in the class. When generating the specialized
functions, make sure that we re-use a previously generated function if
possible.
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There are some minor incompatibilities for BIT STRING:
{bit,Position} is now only only supported for a named
BIT STRING type.
Values longer than the maximum size for the BIT STRING type
would be truncated silently - they now cause an exception.
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Also extend the test suite with more tests of inlined constructs
in object sets.
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According to the ASN.1 standard, having multiple UNIQUE in class
is allowed. For example:
C ::= CLASS {
&id1 INTEGER UNIQUE,
&id2 INTEGER UNIQUE
}
In practice, no one uses multiple UNIQUE.
The ASN.1 compiler will crash if a class with multiple UNIQUE
is used, but the backends have half-hearted support for multiple
UNIQUE in that they generate helper functions similar to:
getenc_OBJECT_SET(id1, 42) ->
fun enc_XXX/3;
...
Since we have no plans to implement support for multiple UNIQUE
(no one seems to have missed it), simplify the helper functions
like this:
getenc_OBJECT_SET(42) ->
fun enc_XXX/3;
...
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To facilitate optimizing PER encoding using an intermediate
format, we must change asn1rtt_real_common:encode_real/1 so that
it only returns the encoded binary.
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Simplify the backends by letting asn1ct_check replacing a
with the actual type.
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Since fbcb7fe589edbfe79d10d7fe01be8a9f77926b89, the 'enumval'
variable is no longer used.
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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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asn1ct_check does not pass #pobjectdef{} records on to the backends
(all the original #pobjectdef{} records have been instantiated and
changed to #objectdef{} records).
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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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Almost always, encode_open_type/1 is called with the return value
from complete/1, which always is a binary. In the rare situation
that encode_open_type/1 is called directly with data from the
user application, call iolist_to_binary/1 before calling
encode_open_type/1.
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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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asn1ct_check has translated all occurrences of 'ANY' to 'ASN1_OPEN_TYPE'.
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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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The only code that is really different between the PER
and UPER backends is encoding of primitive types.
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The wrong backend was used.
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active/1 always returned 'true' (curr(Var) can never return 'nil',
except if Var =:= 'nil'). Therefore, we can eliminate its use and
remove it.
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Commit f16f43446a04c459486356c0b4ad517cc9201895 broke compilation
of InformationFramework for per and uper.
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Support in BER was removed in 3d1279f3cebfdd2483c3afea9f225613fe45cd00.
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Add the option 'legacy_bit_string' to decode to the old list format.
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Refactor decoding of BIT STRINGs so that the run-time code does
not spend testing conditions that are known already at compile-time
(which wastes time and produces unnecessary Dialyzer warnings).
There are three ways to decode BIT STRINGs:
1) To a list of bit names (and {bit,Position} for unnamed positions)
if the BIT STRING type has any bit names.
2a) To a list of ones and zeros if there are no named bits, and the
compact_bit_string option was NOT given.
2b) To a {Unused,Bin} tuple if there are no named bits compact_bit_string
option WAS given.
Structure the decoding functions in the same way.
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Always pre-encode the values for the enumeration. Clean up the
code and let the per and uper back-ends share the code.
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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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It seems that the code was duplicated only to avoid emitting
a semi-colon before the first case clause. Handle that by passing
a Sep argument instead.
While at it, also do the following clean-ups:
* Replace lists:keysearch/3 with lists:keyfind/3.
* Replace the use of is_record/2 with matching
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Support for the notation was removed in 6ef8cbdaaaa1c30a7dc462063.
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Decoding of fragmented OCTET STRINGs was only implemented when the size
was constrained to a single value. While at it, support decoding
fragmented OCTET STRINGS in all circumstances.
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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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It is error-prone to have several copies of the same function.
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Don't waste time calling a trivial function in the run-time library
for encoding and decoding of NULL values.
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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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the values used for generating the range check in case of
a value range should be sorted and have duplicates removed.
For per with optimization (per_rt2ct), sorting has been
added. For both optimized and regular per, the sorting and
duplicate removal code has been simplified.
In case of value range, 'MIN' and 'MAX' is now also checked.
The sorting of constraint values in the check phase remains.
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Enable re-use of integer definitions in subsequent definitions and
added clauses to check greatest common range for sequence definitions
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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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