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The previous variable names can be generated by
projects like LFE and Elixir, leading to possible
conflicts. Our first to choice to solve such conflicts
was to use $ but that's not a valid variable name in core.
Therefore we picked @ which is currently supported and
still reduces the chance of conflicts.
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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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Let it handle `dial_warning()` input as well, to match what `format_warning/2` expects.
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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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This reverts commit e020f75c10410a6943cd055bfa072a2641eab7da.
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* kostis/dialyzer/opaque_type/OTP-13586/PR-1047:
Declare the erl_types:var_table() type as opaque
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Dialyzer's dependency calculation was throwing an error when
encountering an 'apply' node with something that was not a variable
(e.g., a literal). The rest of the code did not know what to do with
this error, which resulted in dialyzer crashing. Fix this by ingoring
the detected error in the dependency calculation phase; later dialyzer
passes know how to properly handle and report this kind of errors
anyway.
This fixes [Erlang-JIRA] (ERL-138).
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This reverts commit bd64ad8e15d66e48b36dbe3584315dd5cfc8b59a.
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and do the following changes:
in erl_types: export the type and an appropriate constructor for it
in dialyzer_contracts: perform all necessary code modifications to
fix all dialyzer warnings
Although no warnings are reported by dialyzer, it's quite possible that
these are not the only places where the opacity of the var_table() data
structure is violated. But I decided to leave these places for a better
version of dialyzer to discover...
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Optimization: A few dictionaries are maps instead of dicts.
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The evaluation of a single SCC has been optimized.
The parallelism when evaluating a single SCC has been removed.
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* experimental/correct_dialyzer_spelling/PR-1007/OTP-13544:
Correct mispelling in Dialyzer's acronym definition
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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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28a4a5057ab9 mistakenly used the non-existing type cerl:tree() instead
of cerl:cerl().
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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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Because the type representation has changed, old PLTs are not
compatible. We update the version to 2.10 because of this.
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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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