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authorKostis Sagonas <[email protected]>2015-05-07 14:43:02 +0200
committerHans Bolinder <[email protected]>2015-10-08 15:09:28 +0200
commit6e93fb788aebb9050da2166749b41ff54197e049 (patch)
tree0fff9e486f879ffd67b35c8b708e0a0b425275f2 /lib/dialyzer/test/small_SUITE_data
parent2e3490364359254d68c45bae7d920e70c895c9de (diff)
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Take out automatic insertion of 'undefined' from typed record fields
Background ----------- In record fields with a type declaration but without an initializer, the Erlang parser inserted automatically the singleton type 'undefined' to the list of declared types, if that value was not present there. I.e. the record declaration: -record(rec, {f1 :: float(), f2 = 42 :: integer(), f3 :: some_mod:some_typ()}). was translated by the parser to: -record(rec, {f1 :: float() | 'undefined', f2 = 42 :: integer(), f3 :: some_mod:some_typ() | 'undefined'}). The rationale for this was that creation of a "dummy" #rec{} record should not result in a warning from dialyzer that e.g. the implicit initialization of the #rec.f1 field violates its type declaration. Problems --------- This seemingly innocent action has some unforeseen consequences. For starters, there is no way for programmers to declare that e.g. only floats make sense for the f1 field of #rec{} records when there is no `obvious' default initializer for this field. (This also affects tools like PropEr that use these declarations produced by the Erlang parser to generate random instances of records for testing purposes.) It also means that dialyzer does not warn if e.g. an is_atom/1 test or something more exotic like an atom_to_list/1 call is performed on the value of the f1 field. Similarly, there is no way to extend dialyzer to warn if it finds record constructions where f1 is not initialized to some float. Last but not least, it is semantically problematic when the type of the field is an opaque type: creating a union of an opaque and a structured type is very problematic for analysis because it fundamentally breaks the opacity of the term at that point. Change ------- To solve these problems the parser will not automatically insert the 'undefined' value anymore; instead the user has the option to choose the places where this value makes sense (for the field) and where it does not and insert the | 'undefined' there manually. Consequences of this change ---------------------------- This change means that dialyzer will issue a warning for all places where records with uninitialized fields are created and those fields have a declared type that is incompatible with 'undefined' (e.g. float()). This warning can be suppressed easily by adding | 'undefined' to the type of this field. This also adds documentation that the user really intends to create records where this field is uninitialized.
Diffstat (limited to 'lib/dialyzer/test/small_SUITE_data')
-rw-r--r--lib/dialyzer/test/small_SUITE_data/results/literals12
-rw-r--r--lib/dialyzer/test/small_SUITE_data/results/record_creation_diffs2
-rw-r--r--lib/dialyzer/test/small_SUITE_data/results/record_pat2
-rw-r--r--lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning2
-rw-r--r--lib/dialyzer/test/small_SUITE_data/results/undefined2
-rw-r--r--lib/dialyzer/test/small_SUITE_data/src/trec.erl2
-rw-r--r--lib/dialyzer/test/small_SUITE_data/undefined.erl29
7 files changed, 41 insertions, 10 deletions
diff --git a/lib/dialyzer/test/small_SUITE_data/results/literals b/lib/dialyzer/test/small_SUITE_data/results/literals
index 03e161ca71..222d2c0cdb 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/literals
+++ b/lib/dialyzer/test/small_SUITE_data/results/literals
@@ -1,14 +1,14 @@
literals.erl:11: Function t1/0 has no local return
-literals.erl:12: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
+literals.erl:12: Record construction #r{id::'a'} violates the declared type of field id::'integer'
literals.erl:14: Function t2/0 has no local return
-literals.erl:15: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
+literals.erl:15: Record construction #r{id::'a'} violates the declared type of field id::'integer'
literals.erl:17: Function t3/0 has no local return
-literals.erl:18: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
-literals.erl:21: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
+literals.erl:18: Record construction #r{id::'a'} violates the declared type of field id::'integer'
+literals.erl:21: Record construction #r{id::'a'} violates the declared type of field id::'integer'
literals.erl:23: Function m1/1 has no local return
-literals.erl:23: Matching of pattern {'r', 'a'} tagged with a record name violates the declared type of #r{id::'integer' | 'undefined'}
+literals.erl:23: Matching of pattern {'r', 'a'} tagged with a record name violates the declared type of #r{id::'integer'}
literals.erl:26: Function m2/1 has no local return
-literals.erl:26: Matching of pattern {'r', 'a'} tagged with a record name violates the declared type of #r{id::'integer' | 'undefined'}
+literals.erl:26: Matching of pattern {'r', 'a'} tagged with a record name violates the declared type of #r{id::'integer'}
literals.erl:29: Function m3/1 has no local return
literals.erl:29: The pattern {{'r', 'a'}} can never match the type any()
diff --git a/lib/dialyzer/test/small_SUITE_data/results/record_creation_diffs b/lib/dialyzer/test/small_SUITE_data/results/record_creation_diffs
index f00c4b10ff..c971935bbf 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/record_creation_diffs
+++ b/lib/dialyzer/test/small_SUITE_data/results/record_creation_diffs
@@ -1,3 +1,3 @@
record_creation_diffs.erl:10: Function foo/1 has no local return
-record_creation_diffs.erl:11: Record construction #bar{some_list::{'this','is','a','tuple'}} violates the declared type of field some_list::'undefined' | [any()]
+record_creation_diffs.erl:11: Record construction #bar{some_list::{'this','is','a','tuple'}} violates the declared type of field some_list::[any()]
diff --git a/lib/dialyzer/test/small_SUITE_data/results/record_pat b/lib/dialyzer/test/small_SUITE_data/results/record_pat
index a46be6c451..8317ea041a 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/record_pat
+++ b/lib/dialyzer/test/small_SUITE_data/results/record_pat
@@ -1,2 +1,2 @@
-record_pat.erl:14: Matching of pattern {'foo', 'baz'} tagged with a record name violates the declared type of #foo{bar::'undefined' | integer()}
+record_pat.erl:14: Matching of pattern {'foo', 'baz'} tagged with a record name violates the declared type of #foo{bar::integer()}
diff --git a/lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning b/lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning
index 2e417e1b2a..ea3ac92d96 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning
+++ b/lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning
@@ -1,3 +1,3 @@
relevant_record_warning.erl:22: Function test/1 has no local return
-relevant_record_warning.erl:23: Record construction #r{field::<<_:8>>} violates the declared type of field field::'binary' | 'undefined'
+relevant_record_warning.erl:23: Record construction #r{field::<<_:8>>} violates the declared type of field field::'binary'
diff --git a/lib/dialyzer/test/small_SUITE_data/results/undefined b/lib/dialyzer/test/small_SUITE_data/results/undefined
new file mode 100644
index 0000000000..9daa8640d3
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/results/undefined
@@ -0,0 +1,2 @@
+
+r.erl:16: Record construction #r{a::{'fi'},b::{'a','b'},c::[],d::'undefined',e::[],f::'undefined'} violates the declared type of field b::[any()] and d::[any()] and f::[any()]
diff --git a/lib/dialyzer/test/small_SUITE_data/src/trec.erl b/lib/dialyzer/test/small_SUITE_data/src/trec.erl
index 06706162c1..516358f7c6 100644
--- a/lib/dialyzer/test/small_SUITE_data/src/trec.erl
+++ b/lib/dialyzer/test/small_SUITE_data/src/trec.erl
@@ -8,7 +8,7 @@
-module(trec).
-export([test/0, mk_foo_exp/2]).
--record(foo, {a :: integer(), b :: [atom()]}).
+-record(foo, {a :: integer() | 'undefined', b :: [atom()]}).
%%
%% For these functions we currently get the following warnings:
diff --git a/lib/dialyzer/test/small_SUITE_data/undefined.erl b/lib/dialyzer/test/small_SUITE_data/undefined.erl
new file mode 100644
index 0000000000..8549f2e161
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/undefined.erl
@@ -0,0 +1,29 @@
+-module(undefined).
+
+-export([t/0]).
+
+%% As of OTP 19.0 'undefined' is no longer added to fields with a type
+%% declaration but without an initializer. The pretty printing of
+%% records (erl_types:t_to_string()) is updated to reflect this: if a
+%% field is of type 'undefined', it is output if 'undefined' is not in
+%% the declared type of the field. (It used to be the case that the
+%% singleton type 'undefined' was never output.)
+%%
+%% One consequence is shown by the example below: the warning about
+%% the record construction violating the the declared type shows
+%% #r{..., d::'undefined', ...} which is meant to be of help to the
+%% user, who could otherwise get confused the first time (s)he gets
+%% confronted by the warning.
+
+-record(r,
+ {
+ a = {fi},
+ b = {a,b} :: list(), % violation
+ c = {a,b} :: list(),
+ d :: list(), % violation
+ e = [] :: list(),
+ f = undefined :: list() % violation
+ }).
+
+t() ->
+ #r{c = []}.