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This fixes a regression introduced in commit 805f9c89fc01220bc1bb0f27e1b68fd4eca688ba
The problem occured with map keys compiled with dialyzer option turned on.
In OTP 17, map keys needs to be literals.
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A module containing two named funs bearing the same name and arity could be
miscompiled.
Reported-by: Sam Chapin
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The scope is supposed to contain all variables that are currently
live. We need this information for certain optimizations to
avoid capturing a name (a name that is in the scope must be renamed;
for an example, see move_let_into_expr/2 or any function that calls
sub_subst_scope/1). We also use the scope to optimize sub_del_var/2
and sub_is_val/2.
When optimizing case expressions, the scope could be reset to an
empty list (because sub_new/0 was called instead of sub_new/1).
That could cause name capture if inlining was turned on.
As simple way to force this bug is to uncomment the
"-define(DEBUG, 1)." near the beginning of the file. Without this
correction, most files in the test suite fail to compile.
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This ticket is about records in Erlang code, and when to check the
fields against the (optional) types given when defining records.
Dialyzer operates on the Erlang Core format, where there are no trace
of records. The fix implemented is a Real Hack:
Given the new option 'dialyzer' erl_expand_records marks the line
number of records in a way that is undone by v3_core, which in turn
inserts annotations that can be recognized by Dialyzer.
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* egil/fix-maps-pretty-layout/OTP-11947:
dialyzer: Add Maps type mismatch test
hipe,compiler: Fix Map literals pretty printing
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* egil/maps-compiler-coverage:
compiler: Do not evaluate map expressions with bad keys
compiler: Throw 'nomatch' on matching with bad binary keys
compiler: Variable keys are not allowed in Maps
compiler: Strengthen Maps warnings tests
compiler: map_pair cannot be a type clause in v3_life
compiler: Remove redudant code in v3_codegen
compiler: Test deep map structure
compiler: Remove redundant clause in v3_codegen
compiler: Cover #{ [] => Var } in testcase
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Map keys with large (non literal) binary keys must fail.
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Even if a binary key is written as a literal the compiler may
choose to make an expression. Emit a warning in those cases
and saying the case will not match.
This is a limitation in current implementation.
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No need to check for variables in Map keys.
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Map pairs are encapsulated in a map.
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The pass sys_core_fold did not correctly handle non-matching patterns in code
such as:
0 = case <<>> of
<<>> -> 0;
a -> 1
end.
Function case_opt_lit/3 is rewritten in two passes to first remove any
non-matching clause and only then potentially remove the related patterns
in each clause.
Reported-by: Ulf Norell
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Multiple 'nil' cannot happen on instruction level.
Map keys are always unique with literals.
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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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* ks/cerl-type-fixes:
Restore the alphabetical order of Core Erlang records
Clean up the types of cerl
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* nox/maps-v3_core-lit_vars:
Properly collect variables in map expressions in v3_core
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* bjorn/compiler/utf8-warning/OTP-11791:
Don't fail compilation for modules that contain invalid UTF-8
epp: Make it possible to specify a default encoding
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The introduction of c_map{} and c_map_pair{} unnecessarily broke the
alphabetical order of Core Erlang records. They were probably placed
at the end of the file so as to use other records as types. There is
really no need for this since 'cerl' contains appropriate definitions
of types that can be used for this purpose.
While at it, a type declaration to the c_binary{} definition was added.
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The introduction of c_map and c_map_pair was not done properly. In
particular, the definition of ctype() and an important Edoc comment
were not up-to-date.
While at it,
- some more types were cleaned up and exported so as to be used
in core_parse.hrl and
- some obviously dead code was removed (the type/1 function does
not return 'nil', which in turn simplified a clause in the code
of meta_1/2).
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The default encoding for Erlang modules is now UTF-8, and the
compilation would fail if a module contained byte sequences that
are not valid UTF-8 sequences.
In a large project with say many hundreds of Erlang modules
with names of developers such as "Björn" or "Håkan" encoded in
latin-1, that could mean that many hundreds of files would need
to be modified just to get started testing OTP 17.
As a temporary measure to ease the transition, automatically
fall back to the latin-1 encoding with a warning for any module
that contains invalid byte sequences and for which no encoding
has been specified.
The intention is to remove this workaround in OTP 18 or 19.
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Reported-by: José Valim
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Core should not understand M#{}
Instead transform M#{} to
case _cor0 of
<_cor1>
when call 'erlang':'is_map'
(_cor0) ->
_cor1
( <_cor2> when 'true' ->
primop 'match_fail'
('badarg')
-| ['compiler_generated'] )
end
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Not only variables are allowed as arguments, the name should reflect that.
Change cerl Map argument interface
* cerl:map_arg/1 is more suitable then cerl:map_val/1 in this case.
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For updates of Map literals which may cause an error will be
determined in runtime, i.e. instructions are emitted for those
updates.
The changes in cerl now requires compiler-5.0 to compile because of
is_map/1 guard.
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Reject all expressions that are known to fail.
Emit 'badarg' for those expressions.
Ex.
[]#{ a => 1}
Is not a valid map update expression.
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Ex.
Instead of:
M~{~<K,V>}~
The format is now:
~{~<K,V>|M}~
This also removes a shift/reduce warning.
The changes in core_pp now requires compiler-5.0 to compile
because of is_map/1 guard, i.e. a need for a compiler with Maps know-how.
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* nox/compiler/beam_bool-mixed-boolean:
Properly detect reused boolean values in beam_bool
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* nox/compiler/sys_core_fold-redundant-clauses:
Properly handle redundant boolean clauses in sys_core_fold
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b08ffc15e1d9ad105dd6385bbac41c97c09b48bc corrected a bug,
but violated the types by passing a c_apply() when a
c_let() was expected. That happened to work, but Dialyzer
was not amused.
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* nox/compiler/v3_core-mismatched-apply:
Do not emit blatantly illformed apply expressions in core_inline
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Boolean case expressions with redundant clauses could make the compiler
crash:
case X == 0 of
false -> no;
false -> no;
true -> yes
end.
Reported-by: Ulf Norell
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The following code could crash the compiler:
f(X = true) when X or true or X -> ok.
Reported-by: Ulf Norell
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* nox/maps-beam_jump-put_map:
Properly collect labels in put_map instructions in beam_jump
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* nox/maps-cerl_clauses:
Support maps in cerl_clauses:match/2
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* nox/maps-beam_jump:
Properly check label use in get_map_elements in beam_jump
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* nox/maps-v3_codegen-sort-nil-keys:
Properly sort map pairs in v3_codegen
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* nox/maps-complex-mixed-values:
Properly order Kernel code for maps with mixed pairs
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* nox/compiler/v3_core-comprehension-no-export:
Do not export variables from comprehension cases in v3_core
OTP-11770
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* nox/compiler/beam_bool-not_boolean_expr:
Compile BIF calls and operator expressions to Core the same way
Do not try to optimize non-boolean guards
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* nox/compiler/core_lint-call-guard:
Properly lint calls in Core Erlang guards
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