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Since commit 12b3790 Dialyzer has not reported unknown types.
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* hasse/dialyzer/fix_warnings/OTP-14177:
dialyzer: Improve a warning
dialyzer: Fix a weird warning
dialyzer: Fix an opaque bug
dialyzer: Minor fix
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When a pattern a type do not match, opaque warnings were given
precedence before structure mismatches.
This is no longer always the case.
Mentioned by Nick Marino on erlang-questions.
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An opaque bug that would crash Dialyzer has been fixed.
The bug was reported by Nick Marino.
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common_test requires that if init_per_suite/1 exists, then
end_per_suite/1 must also exist. If end_per_suite/1 does not exist,
then it will be marked in the log as failed with reason 'undef'. Some
test suites are corrected to avoid this.
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Use explicit file names of PLTs so that daily builds&tests running
simultaneously under the same user do not interfere with each other
("$HOME/.dialyzer_plt" is the default PLT name).
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The signatures of erl_parse:anno_to_term/1 and
erl_parse:anno_from_term/1 are corrected. Using these function no
longer results in false Dialyzer warnings.
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Characters ($char) can be used in constant pattern expressions. They
can also be used in types and contracts.
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Suggested by Kostis.
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Messages regarding guards with orelse/andalso could look
like "Clause guard cannot succeed. The variable A was matched
against the type any()". Now they look like as if or/and is
used: "Guard test is_integer(A::atom()) can never succeed".
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Messages like "Invalid type specification for function
para3:exp_adt/0. The success typing is () -> 3" now look like
"The specification for para3:exp_adt/0 has an opaque subtype
para3_adt:exp1(para3_adt:exp2()) which is violated by the success
typing () -> 3".
The old message did not give any clue as to what invalidated the
contract, namely the opaque subtype.
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Messages like "The attempt to match a term of type rec_api:f()
against the variable _ breaks the opaqueness of rec_adt:f()" now
look like "The attempt to match a term of type rec_adt:f()
against the record field 'f' with type rec_api:f() breaks the
opaqueness of the term".
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Bug reported by Peti Gömöri <[email protected]>.
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If a dialyzer module attribute references an undefined (local)
function an error tuple is thrown but no caught. This leads to a
'nocatch' error and not the intended "clean" error.
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The "decoration" of opaque types works better than before when opaque
types are used by other opaque types.
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t_from_form() sometimes returned a more general type than it should
have done due to a bug in from_form_loop(): it stopped when the limit
was exceeded, which could mean a collapsed type. Returning a type with
smaller depth should fix this.
is_specialization() now handles opaque types before unions, which
should fix another problem.
The bugs reported by Kostis.
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into maint
* margnus1/dialyzer/fix_maps_opaque/ERL-249/PR-1161/OTP-13878:
erl_bif_types: Properly unopaque maps:merge/2 args
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erl_bif_types:type/5 was calling erl_types:map_pairwise_merge/3 directly
with its (potentially opaque) arguments, causing Dialyzer crashes.
Bug (ERL-249) reported and minimised test case provided by Felipe
Ripoll.
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The test 'proper' takes some time.
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Warnings about clauses that cannot match and are also compiler generated
are suppressed unless none of the clauses return.
This feature is useful for non-Erlang BEAM languages (such as Elixir)
that compile to Erlang and expand certain language constructs into case
statements. In that case, as long as the language construct can succeed,
these warnings are undesired and appear spurious to users that do not
check the Erlang code that their program expands into.
Thanks to José Valim for the test (slightly modified).
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t_map/3 previously required callers to perform this normalisation, but
as t_from_form/5 would sometimes fail to do so, this requirement is
relaxed.
Bug (ERL-177) reported and shrunk by Luke Imhoff.
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* hasse/dialyzer/improve_from_form/OTP-13547:
Update primary bootstrap
stdlib: Correct types and specs
dialyzer: Minor adjustments
dialyzer: Suppress unmatched_return for send/2
dialyzer: Improve the translation of forms to types
dialyzer: Use a cache when translating forms to types
dialyzer: Prepare erl_types:t_from_form() for a cache
dialyzer: Optimize erl_types:t_form_form()
dialyzer: Correct types
syntax_tools: Correct types
erts: Correct character repr in doc of the abstract format
stdlib: Correct types and specs
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It is possible that '...' is added later (OTP 20.0), but for now we
are not sure of all details.
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* stavros/dialyzer/fix_call_site_analysis/OTP-13655/PR-1092:
Fix a bug in Dialyzer related to call-site analysis
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Dialyzer's "dataflow" module is using information from the callgraph to
determine which functions may be called at a particular call-site. Unfortunately
this information can include functions that are certainly not among the possible
choices. We don't want to emit warnings in such cases, so a "reasonable"
compromise is to stay silent if there are many possible funs and at least one of
them can succeed.
Bug reported by Dan Gudmundsson, test shrunk down by Magnus Lång.
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Dialyzer failed to remove all loops among constraints.
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A bug is fixed, but there are more problems.
Modify erl_types.erl like this:
-define(EXPAND_LIMIT, 500).
and bogus warnings are output (again).
Callbacks and specs are compared (subtype) in dialyzer_behaviour. If
they are expanded to different depths, then invalid warnings can be
generated.
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Opaque singleton keys have the unfortunate property, unlike any other
singleton type, to overlap with other singleton types that do not have
the same internal representation. Therefore, we must not keep opaque
singletons in the Pairs list in a map type.
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t_subtract/2 would break its postcondition by always returning the
underapproximation none() when given a variable on the right hand side.
This broke map type parsing, since it relied on t_subtract/2 to tell it
when map keys would shadow each other.
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Opaque keys in maps broke an assumption in
erl_types:mapmerge_otherv/3 (that the infinimum of a singleton type and
some other type would either be none() or that same singleton type),
causing a case_clause crash.
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dialyzer_typesig:traverse/3 would perform an unsafe optimisation when
given a cons pattern that contained a map and could be folded into a
literal with cerl:fold_literal/1. In this case, when traversing the map
a type variable would be generated, but this variable would be dropped
by the erl_types:t_cons/2 constructor by in turn calling t_sup(),
producing the overapproximation any(). However, in this particular case,
dialyzer_typesig:traverse/3 is not allowed to overapproximate, since its
result is used in an EQ-constraint.
Although erl_types:t_tuple/1 does not overapproximate like t_cons/2,
which makes the bug unlikely to affect tuples too, the fix was
nevertheless applied defensively to the case of tuples as well.
Also, fix a bug where dialyzer_utils:refold_pattern/1 would generate
syntax nodes with two {label, _} attributes.
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This is analogous to the case of nil. Since #{} is a base-case of almost
all map types, contract and success typing sharing #{} does not mean
much, and is often sign of a violation.
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mk_constraint_list/2 was simplifying (C OR TriviallyTrue) to (C), which
is obviously wrong.
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The assumption that 'try' nodes were only used to wrap entire guards is
no longer true.
We're still swallowing warnings when the handler returns successfully.
Unfortunately, bind_guard/5 would need to be refactored to return a new
state in order to generate those warnings.
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Dialyzer relies heavily on the assumption that the type of a literal
that is used as a pattern is the type of any value that can match that
pattern. For maps, that is not true, and it was causing bad analysis
results. A new help function dialyzer_utils:refold_pattern/1 identifies
maps in literal patterns, and unfolds and labels them, allowing them to
be properly analysed.
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Using the new type syntax, we can specify which keys are required, and
which are optional in a way Dialyzer could use.
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* maps:from_list/1
* maps:get/2
* maps:is_key/2
* maps:merge/2
* maps:put/3
* maps:size/1
* maps:to_list/1
* maps:update/3
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The type of a map is represented as a three-tuple {Pairs, DefaultKey,
DefaultValue}. DefaultKey and DefaultValue are types. Pairs is a list of
three-tuples {Key, mandatory | optional, Value}, where Key and Value are
types. All types Key must be singleton, or "known at compile time," as
the EEP put it. Examples:
#{integer()=>list()} {[], integer(), list()}
#{a=>char(), b=>atom()} {[{a, optional, char()},
{b, optional, atom()}],
none(), none()}
map() {[], any(), any()}
A more formal description of the representation and its invariants can
be found in erl_types.erl
Special thanks to Daniel S. McCain (@dsmccain) that co-authored a very
early version of this with me back in April 2014, although only the
singleton type logic remains from that version.
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As a first step to removing the test_server application as
as its own separate application, change the inclusion of
test_server.hrl to an inclusion of ct.hrl and remove the
inclusion of test_server_line.hrl.
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* maint:
dialyzer: Correct byte_size() and comparisons
Conflicts:
lib/hipe/cerl/erl_bif_types.erl
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The argument of byte_size() is a bitstring().
The code in erl_bif_types that finds cases where comparisons always
return true or false is corrected when it comes to maps and bit
strings.
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