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complete/1 is used when encoding open types (as well as in the
encode/2 function in a generated module).
The use of complete/1 for encoding open types used to be optimized
in two different places.
One place was in the alignment optimization pass, where we attempted
to replace the call to complete/1 with a call to iolist_to_binary/1.
That optimization was taken out in a previous commit that introduced
the {list,_,_} intermediate instruction.
The other place was when creating the intermediate representation
for the encoding of the open type. When attempting to wrap primitive
types in an open type, we would attempt to optimize the encoding of
the length decscriptor. We will remove that optimization in this
commit.
Since the previous two optimizations did not optimize encoding of
open types as much as we would want, we will introduce a new
optimization in a separate pass that will go further than the
previous optimizations.
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The {list,List,Dst} instruction gives us as general way to
capture the building of something into a variable. That will make
inlining of intermediate code much easier.
It also allows us to eliminate the versions of the apply, call_gen,
and cond instructions that takes a target variable.
Also remove the optimization in the alignment optimization pass
that attempts to replace calls to complete/1 with calls to
iolist_to_binary/1. That optimization will not work anymore without
rewriting, so we will remove it in this commit and introcude a
more powerful optimization in a future commit.
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Instead of generating:
{assign,Dst,"element(2, Val)"}
generate:
{call,erlang,element,[2,{var,"Val"}],Dst}
The latter expression is easier to understand since there is no
need to parse a string which may contain an arbitrary expression.
While at it, also discontinue the practice to treat "naked"
atoms as variables. A variable must always be given as {var,String}.
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The {assign,Dst,Src} instruction is difficult to cope with when
doing advanced optimizations, since its source argument is a string
which may contain any expression.
Instead of changing how {assign,_,_} works, we will introduce new
instructions that can be used instead of {assign,_}, and remove
{assign,_,_} in a later commit when it is no longer used.
The first new instruction we will introduce is:
{set,{var,Src},{var,Dst}}
It is useful for common sub-expression elemination among other things.
For the moment, we will only allow a variable as a source argument,
but we could extend it in the future to allow constants as well.
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To facilitate inlining of apply calls in the intermediate format.
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It will greatly facilitate further optimizations if we include the
intermediate code (if available) in the call_gen tuple.
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Make sure that we don't construct:
{cons,{integer,I},{cons,{binary,B},T}} - OR -
{cons,{binary,B},{cons,{integer,I},T}}
but:
{cons,{binary,[{put_bits,I,8,[1]}|B]},T} - OR -
{cons,{binary,B++[{put_bits,I,8,[1]}]},T}
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The function name could contain hyphens or other characters not
allowed in non-quoted function names.
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* maint:
PER/UPER: Handle a range in the extension part of the constraint
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* bjorn/asn1/fix-integer-constraint/OTP-11504:
PER/UPER: Handle a range in the extension part of the constraint
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Constraints such as:
INTEGER (1..10, ..., 11..20)
would fail to compile. Make sure it is properly ignored.
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* maint:
Fix complicated union of INTEGER constraints
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* bjorn/asn1/fix-union-bug/OTP-11411:
Fix complicated union of INTEGER constraints
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* maint:
PER/UPER: Correct encoding for single-value extensible constraints
asn1ct_value: Handle named INTEGERs with constraints
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* bjorn/asn1/fix-extensible-single-values/OTP-11415:
PER/UPER: Correct encoding for single-value extensible constraints
asn1ct_value: Handle named INTEGERs with constraints
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* maint:
Fix broken handling of default values for BIT STRINGs
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* bjorn/asn1/fix-default-values/OTP-11319:
Fix broken handling of default values for BIT STRINGs
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* maint:
Cope with .erlang files that print to stdout
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A constraint that was an union of integer ranges:
Type ::= INTEGER (lb1..ub1 | ... | lbN..ubN)
would sometimes (depending on the values) not all always be properly
combined to a single effective range, but would become:
Type ::= INTEGER (lb2..ub2) (lb3..ub3)
If that type was used in a SEQUENCE:
S ::= SEQUENCE {
v Type
}
the constraint would be simplified, taking the intersection of the
ranges.
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For DER/PER/UPER, a value equal to the DEFAULT is not supposed to
be encoded.
BIT STRINGs values can be represented as Erlang terms in four
different ways: as an integer, as a list of zeroes and ones,
as a {Unused,Binary} tuple, or as an Erlang bitstring.
When encoding a BIT STRING, only certain representations of
BIT STRINGs values were recognized. All representations must
be recognized.
When decoding a DEFAULT value for a BIT STRING, the actual value
given in the decoding would be either an integer or a list
of zeroes and one (depending on how the literal was written in
the specification). We expect that the default value should be
in the same representation as any other BIT STRING value (i.e.
by default an Erlang bitstring, or a list if the 'legacy_bitstring'
option has been given, or as compact bitstring if 'compact_bitstring'
has been given).
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Don't redirect standard output when auto-generating the asn1ct_rtt.erl
and asn1ct_eval*.erl source files, because anything printed form
.erlang will end up in them, probably causing a compilation error.
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An extensible constraint which is a union of single values, such as:
INTEGER (1|17, ...)
would be incorrectly encoded.
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The asn1ct:value/2 function would crash for name INTEGERs with
constraints, such as INTEGER {a(2),b(3),z(17)} (2|3|17, ...).
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* maint:
Teach the ASN.1 compiler the no_ok_wrapper option
Optimize the generated decode/2 function
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Add the no_ok_wrapper option so that the generated M:encode/2 and
M:decode/2 functions will not wrap a successful return value in an
{ok,...} tuple. Errors will cause exceptions.
Eliminating the wrapping tuple allows simpler nesting of calls.
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Use 'try' instead of 'catch', and don't match anything that
cannot actually be returned from the generated encoding code.
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* maint: (24 commits)
No longer compile the X420 specs for plain BER
Combine the testSeqIndefinite/1 and testSetIndefinite/1 test cases
Remove asn1_wrapper
Eliminate the use of asn1_wrapper
Simplify tests of CHOICE with OPTIONAL
asn1_test_lib: Add roundtrip functions and use them everywhere
Makefile: Release Emakefile to ensure warnings are treated as errors
Don't allow unused exported functions in test case helpers
Move out specific tests from asn1_test_lib
testMegaco: Remove unused exported function msg11/0
ASN.1 tests: Don't export functions that are only locally called
Remove unused pem_performance.erl file
asn1_SUITE: Reinstate test of sub-constraint
ASN.1 tests: Remove unused choice_extension.erl
Remove unused compile() functions
asn1_test_lib: Remove unnecessary loading of a compiled ASN.1 spec
Slightly clean up testX420
asn1_SUITE: Combine most tests that use External.asn1
asn1ct_gen: Clean up process dictionary after generating
asn1ct_parser2: Clean the process dictionary after parsing
...
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Cleanliness.
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Apart from cleanliness, the test suite runs many tests cases in
parallel, so it never hurts to reduce the memory pressure.
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* maint: (26 commits)
genop.tab: Add documentation for many BEAM instructions
asn1ct_constucted_per: Directly call asn1ct_gen_per
Clean up handling of .asn1db files
PER, UPER: Fix encoding/decoding of open types greater than 16K
PER, UPER: Optimize table constraints
PER, UPER: Optimize encoding using an intermediate format
Refactor decoding of components of SEQUENCE OF / SET OF
PER,UPER: Get rid of unused 'telltype' argument in decoding functions
Optimize the generated encode/2 function
UPER: Optimize complete/1
Clean up checking of objects
Improve tests of deep table constraints
BER: Handle multiple optional SEQUENCE fields with table constraints
Test OPTIONAL and DEFAULT for open types
PER/UPER: Fix encoding of an object set with multiple inlined constructs
Remove broken support for multiple UNIQUE
Extend the test for parameterized information objects
asn1_SUITE: Remove off-topic (and slow) smp/1 test case
SeqOf: Add more tricky SEQUENCE OF tests
Clean up handling of extension addition groups
...
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There is (differenct) code for reading .asn1db files both in
asn1ct and asn1_db. Consolidate the reading into one routine
in asn1db.
Another problem is that the encoding rule that the .asn1db
file was created for is not in the .asn1db, but only in the
generated Erlang module. It is much easier and safer to put
the encoding rule in the .asn1db file itself. We will also
put the version number of the asn1 application into the file,
to ensure that we don't use an old .asn1db file that could
potentially be incompatible.
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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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As a preparation for rewriting handling of table constraints,
we must make sure that code for decoding a SEQUENCE OF / SET OF
can be be contained in a single clause of a function; thus, we
must not output the helper function for decoding of each component
directly following the code that follows it. Use asn1ct_func:call_gen/3
to delay outputting the helper function.
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Use 'try' instead of 'catch', and don't match anything that
cannot actually be returned from the generated encoding code.
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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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Break out the code to a separate function to make it more readable.
Also avoid hard-coding the name of the value to use as "Val1" as
it may not be true in the future.
Instead of using a list comprenhension like this:
case [X || X <- [element(5, Val),element(6, Val)],
X =/= asn1_NOVALUE] of
[] -> ...;
_ -> ...
end
use an orelse chain:
case element(5, Val) =/= asn1_NOVALUE orelse
element(5, Val) =/= asn1_NOVALUE of
false -> ...;
true -> ...
end
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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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The first clause of gen_enc_line() allows us to pass in [] as
the value for Element; if we modify the only caller that passes
[] to pass an actual expression we can remove the first clause.
Furthermore, since the Pos argument was only used by the first
clause, we can remove the Pos argument.
We can also remove the first clause in gen_enc_component_optional(),
since the code in its body is exactly the same as in the following
clause.
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