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Dialyzer sometimes output warnings like
Attempt to test for inequality between a term of type 'false' and a
term of opaque type 'false' | gb_set()
The reason was that erl_types:t_inf/3 when called from
erl_types:t_find_unknown_opaque() did not return 'false' but found the
mismatch. It should not return the mismatch unless the intersection is
empty ('none').
Thanks to Shayan Pooya [[email protected]] for pointing out the bug.
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The option `warn_export_vars` was erroneously written as `warn_exported_vars`
in Makefiles of dialyzer and typer. As a result, `erlc` was silent about such
warnings (why on earth doesn't it complain on unrecognized options??) which
were corrected as part of this change.
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* ks/hipe-is_map-support/OTP-11831:
Reinstate native code compilation of cerl and erl_types
Take out no_native compiler attribute
Add support for the compilation of the is_map/1 guard to native code
Add 'map' to the set of icode_type_test()s
Support the translation of the is_map BEAM instruction to Icode
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On SMPs, the time reports that Dialyzer produced when crashing were
inaccurate. Fix this by using wall_clock rather than runtime.
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Two steps are needed to make this work:
1) Avoid generating the additional "apply_constraint" in dialyzer_typesig by
reporting every function argument as a potential external function (patch on
dialyzer_dep).
This will produce correct success typings for all functions in the test case,
but dataflow would miss the key warnings that help identify the bugs.
2) Patch dialyzer_dataflow so that it uses the "handle just external" path as a
fallback whenever there are any external calls. As a result, if we have info
about some paths, then:
a) use the old "handle known apply" code to mark these functions as used and
b) ignore the generalized result and use the one found by typesig for the
return value of the apply itself.
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* aronisstav/hipe/opaque_fix:
Don't 'opaque-decorate' a success typing using an incompatible spec
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Without this patch Dialyzer crashes when analyzing the supplemented test case.
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The types of some record fields were wrong. This file uses some module
local format of race warnings and when the analysis is done transforms
this format into the format of general dialyzer warnings. This change
fixes the type declaration of the race_warning field of the #races{}
record which was wrong. In addition, declared the type of the state
field in some other record that, long ago, could not be declared since
mutually recursive types were not supported by Dialyzer's analysis.
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Guard constraints used to be limited to a certain depth, which handled
mutually depending constraints safely, but also sometimes introduced
unnecessary generalizations.
This patch puts no explicit limit upon guard constraints (other than
those that already exist in erl_types), but breaks cycles by replacing
variables with the any() type.
In some cases the old method resulted in more warnings, but since the
limit was quite arbitrary and mutually depending guard constraints are
(very) rare, the new method should been seen as an improvement since
it handles cases that used to make Dialyzer loop or miss warnings.
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Most dependencies introduced are exactly the dependencies to other
applications found by xref. That is, there might be real dependencies
missing. There might also be pure debug dependencies listed that
probably should be removed. Each application has to be manually
inspected in order to ensure that all real dependencies are listed.
All dependencies introduced are to application versions used in
OTP 17.0. This since the previously used version scheme wasn't
designed for this, and in order to minimize the work of introducing
the dependencies.
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Not (yet) documented.
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The warnings about unknown types and functions are now returned
when calling Dialyzer from Erlang, in particular from an escript.
When calling Dialyzer from the command line the warnings about unknown
types and functions are output last as before; and when using the GUI
the warnings are displayed in a pop-up window, as before.
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* siri/master-cuddle-with-tests:
Remove "coding: utf-8" from test files
Change encoding for XML files to utf-8
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hipe:c/1 ignores '-compile(no_native).'
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UTF-8 is now the default encoding and should no longer be
specified. These have probably been merged from maint earlier and the
coding statement was missed.
lib/dialyzer/test/opaque_SUITE_data/src/modules/opaque_erl_scan.erl
lib/diameter/test/diameter_codec_test.erl
lib/ssh/test/ssh_unicode_SUITE.erl
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* fenollp/otp-edoc-usage-fixes:
Fix edoc usage errors
OTP-11702
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* hb/dialyzer/fix_on_load/OTP-11743:
FIx handling of 'on_load' attribute
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* hb/dialyzer/deprecate_types/OTP-10342:
Deprecate pre-defined built-in types
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* schlagert/fix_basic_appups:
Dynamically configure typer_SUITE according to environment
Disable hipe_SUITE when environment doesn't support it
Make hipe non-upgradable by setting appup file empty
Fix missing module on hipe app file template
Add test suites performing app and appup file checks
Introduce appup test utility
Fix library application appup files
Fix non-library appup files according to issue #240
OTP-11744
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Add the mentioned test suites for *all* library and touched
non-library applications.
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[pull request from Kostis Sagonas]
The handling of functions appearing in an 'on_load' attribute was wrong.
Instead of considering the functions specified in these attributes as
escaping from the module and performing a full analysis starting from
them, the code just bypassed this analysis and only suppressed unused
warning messages for these functions. This worked for most of the cases
but resulted in functions (directly or indirectly) called by 'on_load'
functions being reported as not called by the module.
Such a case existed in the code of the 'crypto' application.
To solve these issues the initialization code for functions escaping
from the module was changed and the test for the on_load functionality
was appropriately extended.
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The types array(), dict(), digraph(), gb_set(), gb_tree(), queue(),
set(), and tid() have been deprecated. They will be removed in OTP 18.0.
Instead the types array:array(), dict:dict(), digraph:graph(),
gb_set:set(), gb_tree:tree(), queue:queue(), sets:set(), and ets:tid()
can be used. (Note: it has always been necessary to use ets:tid().)
It is allowed in OTP 17.0 to locally re-define the types array(), dict(),
and so on.
New types array:array/1, dict:dict/2, gb_sets:set/1, gb_trees:tree/2,
queue:queue/1, and sets:set/1 have been added.
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Handle immediate opaque types as aliases:
A declaration of dict/0
-opaque dict() :: dict(_, _).
-opaque dict(Key, Value) :: ...
is handled as an alias, that is, when using dict() it is immediately
replaced by dict(_, _).
This is a means to avoid having to handle equivalent opaque types
later. To be changed if it doesn't work well.
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As discussed in issue #240 *all* OTP library applications use the '.*'
wildcard as up and down version. This makes library applications
always up- and downgradeable. Using the wildcard version obsoletes
all maintenance tasks regarding library applications' appup files.
Additionally, it prevents upgrade problems caused by automatically
included application dependencies when using reltool to create
releases. Missing copyright headers are now consistently present.
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* bjorn/lc-warnings/OTP-11626:
dialyzer: Silence useless warnings about list comprehensions
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* vinoski/dialyzer-doc-fix:
fix -Wno_behaviours doc error in dialyzer man page
OTP-11706
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Errors discovered using `erldocs`:
Superfluous @hidden tag would exit edoc application;
'Multiple @spec tag': appended a @clear tag after macro condition;
'@spec arity does not match': added missing argument.
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* kostis/dialyzer-r17c0-fixes:
Shut off a dialyzer unmatched return warning
Add a spec for a function that does not return
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Dialyzer will warn if the value of list comprehension is
ignored by putting it in a sequence like this:
[SomeSideEffect(E) || E <- Es],
ok
To avoid a warning, you'll have to write:
_ = [SomeSideEffect(E) || E <- Es],
ok
Most of the time, this warning is merely annoying because it does
not point out any real errors.
Kostis Sagonas suggested that by suppressing the warning for
list comprehension that return a list of a simple type (e.g. ['ok']),
there would be no warning for code such as:
[io:format("~p\n", [E]) || E <- Es],
ok
but there would be still be a warning for:
[file:close(Fd) || Fd <- Fds],
ok
because an error condition is ignored.
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Dialyzer does not like list comprehensions for which the result is not
assigned to some variable (maybe anonymous). In this particular case,
the comprehension, containing only a filter but no generator, was used
to save some lines, but IMO this type of code, while "cute", is not so
easy to comprehend.
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* hb/dialyzer/opaque_types_fixes/OTP-10397:
[dialyzer] Re-work the handling of opaque types
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It is now OK to inspect and modify the internals of opaque types within
the scope of the module.
The contracts are used for decorating types with opaqueness when it is
harmless to do so. The opaqueness is propagated by the typesig module
and also by the dataflow module.
A lot of details have been fixed or updated. In particular the modules
erl_types and erl_bif_types have been modified extensively.
The version in vsn.mk has been updated to 2.7. The reason is a
modification of #opaque{} in erl_types.
Dialyzer seems to be about five percent slower than it used to be.
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The branch that patched this file to handle the new "named funs"
added an extra argument to the main function of the module but
forgot to update its spec.
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The description of the -Wno_behaviours in the dialyzer man page incorrectly
includes a "***" footnote marker, indicating that it's an option that turns
on a warning rather than turning it off. Since the option actually turns
off a warning, remove the marker. This fix makes the documentation match
that obtained from dialyzer --help.
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This adds optional names to fun expressions. A named fun expression
is parsed as a tuple `{named_fun,Loc,Name,Clauses}` in erl_parse.
If a fun expression has a name, it must be present and be the same in
every of its clauses. The function name shadows the environment of the
expression shadowing the environment and it is shadowed by the
environment of the clauses' arguments. An unused function name triggers
a warning unless it is prefixed by _, just as every variable.
Variable _ is allowed as a function name.
It is not an error to put a named function in a record field default
value.
When transforming to Core Erlang, the named fun Fun is changed into
the following expression:
letrec 'Fun'/Arity =
fun (Args) ->
let <Fun> = 'Fun'/Arity
in Case
in 'Fun'/Arity
where Args is the list of arguments of 'Fun'/Arity and Case the
Core Erlang expression corresponding to the clauses of Fun.
This transformation allows us to entirely skip any k_var to k_local
transformation in the fun's clauses bodies.
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Dialyzer so far only supported letrecs at the top-level
and comprehension-like letrecs (i.e. that were directly applied)
in their body.
This commit address this issue by storing in the callgraph
bound letrec labels pointing to their functions. This information
is then used by the dataflow to properly lookup recursive
definitions.
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