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The internal representation for constraints (and object sets)
as produced by the parser was awkward, making further processing
convoluted. Here follows some examples of the old representation
for INTEGER constraints.
The constraint 1..2 is represented as:
{'ValueRange',{1,2}}
If we extend the constraint like this:
1..2, ...,
or like this:
1..2, ..., 3
the representation would be:
{{'ValueRange',{1,2}},[]}
and
{{'ValueRange',{1,2}},{'SingleValue',3}}
respectively. Note that the pattern {A,B} will match all these
constraints.
When combining constraints using set operators:
1..2 | 3..4 ^ 5..6
the representation will no longer be a tuple but a list:
[{'ValueRange',{1..2}} union
{'ValueRange',{3..4}} intersection
{'ValueRange',{5..6}}]
The parse has full knowledge of the operator precedence; unfortunately,
the following pass (asn1ct_check) must also have the same knowledge
in order to correctly evaluate the constraints.
If we would change the order of the evaulation with round brackets:
(1..2 | 3..4) ^ 5..6
there would be a nested listed in the representation:
[[{'ValueRange',{1..2}} union {'ValueRange',{3..4}}]
intersection {'ValueRange',{5..6}}]
We will change the representation to make it more explicit.
At the outer level, a constraint is always represented as
{element_set,Root,Extension}
Extension will be 'none' if there is no extension, and 'empty' if
there is an empty extension. Root may also be 'empty' in an object set
if there are no objects in the root. Thus the constraints:
1..2
1..2, ...
1..2, ..., 3
will be represented as:
{element_set,{'ValueRange',{1,2}},none}
{element_set,{'ValueRange',{1,2}},empty}
{element_set,{'ValueRange',{1,2}},{'SingleValue',3}}
We will change the set operators too. This constraint:
1..2 | 3..4 ^ 5..6
will be represented as:
{element_set,
{union,
{'ValueRange',{1,2}},
{intersection,
{'ValueRange',{3,4}},
{'ValueRange',{5,6}}},
none}}
which is trivial to understand and evaluate. Similarly:
(1..2 | 3..4) ^ 5..6
will be represented as:
{element_set,
{intersection,
{union,{'ValueRange',{1,2}},{'ValueRange',{3,4}}},
{'ValueRange',{5,6}}},
none}
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Instead of only compiling to the abstract format using 'abs',
also compile to each of the back-ends.
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The warnings in the ASN.1 are being eliminated one by one and
replaced with errors. Therefore, it is no longer possible to test
warnings_as_errors. We will reimplement this test case in the future
if we will introduce some new sensible warnings.
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NeedRest was introduced in df7bb30f, for unknown reasons (my guess
is that the argument was needed at some point during the development
of the commit).
Found by dialyzer.
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Changed the following from the original copies:
PKCS-5 (renamed from PKCS-v21)
PKCS-9 Import from CryptographicMessageSyntax-2009 instead
of CryptographicMessageSyntax
Since most of the files from the x420 directory are needed,
copy all of them into the rfcs directory and remove the
x420 directory and test case. Copy the test of OTP-7759 to
the testRfcs test case.
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Fixes needed to avoid a compiling asn1 files in order.
For example the x420 directory in test now compiles with
erlc *.asn
Do not save class records without module information in asn1db files.
Use recursive get_referenced_type in get_objclass_fields/2
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The ObjectSetFromObjects construct is implemented using
the object_set_from_objects() function, which is similar
to get_fieldname_element(). Rewrite the ObjectSetFromObjects
handling to use get_fieldname_element() to share more code.
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a1260b2ffa60581ce3af0728320b593cca3fd7b0 fixed a problem with
expansion of parameterized types, but it didn't go all the way.
The compiler would still crash if we attempted to define a value
using the instantiated type.
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Introduce match_parameter/2 for matching a single parameter and
match_parameters/2 for matching all of them.
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The constraint_member/2 function is used for looking up 'simpletable'
and 'componentrelation' constraints. Both parts of its name are
misleading. The "constraint" part makes you think that it is a general
function for constraints, but it is not - it can only search for
'simpletable' and 'componentrelation'. The "member" part makes you
think that it would return a boolean, but it returns either
{true,Tuple} or false, making it more similar to lists:keysearch/3.
Use lists:keyfind/3 (or lists:keymember/3) instead of
constraint_member/2. Also use lists:keyfind/3 in one place where
there was a direct matching of a 'simpletable' constraint.
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There is no reason to handle tags differently depending on the
back-end. The PER back-end will simply ignore tags.
There is also a bug in tags the ABSTRACT-SYNTAX and TYPE-IDENTIFIER
pre-defined classes. So far it has not caused problems, but it could
do in a future commit, such as the next commit...
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To be sure that indirect references to classes are solved.
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The parser handled the builtin ABSTRACT-SYNTAX and TYPE-IDENTIFIER
classes specially, which caused problems. It turns out that there
is no longer any need to handle those classes specially.
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An optional group must not contain mandatory class fields. All
mandatory fields must be included in the simplified syntax.
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Add the ASN.1 specs from RFC-5911 and RFC-5912.
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Besides simplifying the code and doing better error checking
and error reporting, fix the following bugs:
Support retrieving an OBJECT IDENTIFIER/RELATIVE-OID from an
object. Example:
oid OBJECT IDENTIFIER ::= some-object.&some-field
Allow an integer constant first in an OBJECT IDENTIFIER:
integer INTEGER ::= 0
oid OBJECT IDENTIFIER ::= {integer 1}
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Wrong fields in the record where checked when sorting, which caused
duplicate objects to exist in constructed object sets and later caused
an error.
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asn1ct_gen:gen_types/3 is called by gen_encode_constructed/4 and
generates encode *and* decode functions for any nested types.
To faciliate future rewriting, where we might want to tweak code
generation for encode and decode separately, refactor the code
so that gen_encode_constructed/4 will only encode functions for
nested types, and gen_deccode_constructed/4 will generate decode
functions for nested types.
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PKIX1Explicit-2009 did not compile.
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Also add proper error handling.
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File names and line number information was not reliable available
when producing error messages. Some items have embedded line number
information, and sometimes the S#state.type and/or S#state.value
could be used to retrieve the line number information.
To make sure that we can always retrieve at least an approximate
error location, store the top-level construct being checked in
S#state.error_context. Example of top-level constructs:
Seq ::= SEQUENCE {...}
i INTEGER ::= 42
This is a short-term solution. In the long term, we would want the
parser to include line number information in all items.
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Object sets with extension mark and without optional fields was not
generated properly. It needs the default [enc|dec]_xxx function clause
for the open type but no other clauses.
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Rewrite the confusing and buggy matching of an object definition
against the simplified syntax.
While we are at it, we will also add proper error handling.
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When the parser sees:
something SOMETHING ::= {}
it has no way of knowing whether 'something' is an value or an
object. It depends on how SOMETHING is defined. For example:
SOMETHING ::= SEQUENCE {}
or
SOMETHING ::= CLASS { &id OPTIONAL }
Because of that ambiguity, there is no way to avoid a special case
when we check an object definition. However, there is no need to
invent an entire new checking function for this special case. It is
much easier to just pretend that the parser gave us
{object,defaultsyntax,[]} and let check_objectdefn/3 check it in the
usual way.
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An #'Externavaluereference'{} may either be a value or an object.
In places where objects are expected, we will need to call
object_to_check/1 to convert an #'Externavaluereference'{} to an
object. It was forgotten in two places.
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Refactor and clean up code. While at it, add error handling and
test cases. (Also add test cases for the existing values in
ValueTest.asn while we are it.)
Add support for defining INTEGER constants by extracting
fields from objects. Example:
int-from-object INTEGER ::= object.&id
When extracting values from objects in constraints, only one
level of extraction would work. That is, the following would
work:
SomeName ::= INTEGER (object.&int)
but not:
SomeName ::= INTEGER (object.&obj.&int)
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There is duplicated effort in that validate_integer() checks
whether the integer value is valid, and then normalize_integer()
does mostly the same work in order to convert the value to an
integer.
Eliminate the validate_integer() function and incorporate
its checks into normalize_integer(). Also produce proper
error messages.
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Class names must start with an uppercase letter and only contain
uppercase letters, digits, or hyphens. The parser will not allow
class names that don't start with an uppercase letter, so we don't
have to check that.
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We only tested that ValueTest.asn1 would compile, no that the
values were correct.
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Don't build a record using the tuple syntax. It is bad in case
we would want to change the record definition later.
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* bjorn/compiler/beam_dead/OTP-12393:
Update the comments that explain what beam_dead does
Improve optimization of bs_start_match2
Extend count_bits_matched/3 to handle the UTF instructions
misc_SUITE: Cover the exception handling code in beam_dead
Generalize optimizations using shortcut_rel_op/4
beam_dead: Optimize branches from relational conditionals
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While we are, clean up the comments and rearrange the code for
clarity. Also add a test to cover the last uncovered line in
beam_dead.erl.
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Amend the test suite to call beam_dead as originally intended (and not
beam_block), and modify the input data so that the exception will
occur within the try ... catch block in function/2.
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Better optimizations with less code.
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The BEAM compiler translates code such as:
is_hex_digit(D) when $0 =< D, D =< $9 -> true;
is_hex_digit(D) when $a =< D, D =< $z -> true;
is_hex_digit(D) when $A =< D, D =< $Z -> true;
is_hex_digit(_) -> false.
to something like this:
L0: test is_ge L1 {x,0} 48
test is_ge L1 57 {x,0}
move true {x,0}
return.
L1: test is_ge L2 {x,0} 97
test is_ge L2 122 {x,0}
move true {x,0}
return
L2: test is_ge L3 {x,0} 65
test is_ge L3 90 {x,0}
move true {x,0}
return
L3: move false {x,0}
return
We can see that tests will be repeated even if they cannot possibly
succeed. For instance, if we pass in {x,0} equal to 32, the first
test that {x,0} is greater than or equal to 48 at L0 will fail.
The control will transfer to L1, where it will be tested whether
{x,0} is greater than 97. That test will fail and control
will pass to L2, where again the test will fail.
The compiler can do better by short-circuiting repeating tests:
L0: test is_ge L3 {x,0} 48
test is_ge L1 57 {x,0}
move true {x,0}
return.
L1: test is_ge L2 {x,0} 97
test is_ge L3 122 {x,0}
move true {x,0}
return
L2: test is_ge L3 {x,0} 65
test is_ge L3 90 {x,0}
move true {x,0}
return
L3: move false {x,0}
return
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