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Assigning the result of a BIF call to a variable used to be
sufficient to prevent the call from being optimized away. With
the more aggressive optimization that will be introduced in
a future commit it will not be sufficient.
Matching the return value will prevent the compiler from doing
the optimization.
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* maint:
Update primary bootstrap
Be more careful about map patterns when evalutating element/2
Do not convert map patterns to map expressions
Conflicts:
bootstrap/lib/compiler/ebin/sys_core_fold.beam
lib/compiler/test/match_SUITE.erl
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* bjorn/compiler/map-bugs/OTP-12451:
Be more careful about map patterns when evalutating element/2
Do not convert map patterns to map expressions
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We must not convert map patterns to map expressions.
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In code such as:
case {a,Map} of
{a,#{}}=T ->
T
end
we must NOT rewrite a map pattern to a map expression like this:
case Map of
#{} ->
{a,#{}}
end
because the pattern '#{}' will match any map, but the expression
'#{}' will construct an empty map.
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* ia/ssl/self-signed-root/OTP-12449:
ssl: Remove selfsigned anchor certificate from the certificate chain
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A selfsigned trusted anchor should not be in the certifcate chain passed to
the certificate path validation.
Conflicts:
lib/ssl/src/ssl_certificate.erl
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* mikpe/hipe-code-alloc-fixes:
hipe: improve error handling at code allocation failure
hipe: remove two obsolete BIFs
hipe: remove HIPE_ALLOC_CODE macro
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* 0xAX/inets-typo-fix:
lib/inets: fix typo in httpd_load_test example
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* bjorn/compiler/map-fixes:
cerl: Remove a clause in fold_map_pairs/3 that will never be reached
Move grouping of map constructions from v3_core to v3_kernel
core_pp: Correct printing of map literals
Strengthen and modernize compile_SUITE
core_parse: Always fold literal conses
cerl: Make sure that we preserve the invariants for maps
cerl_clauses: Fix indentation
sys_core_fold: Strengthen optimization of letrecs in effect context
Fix handling of binary map keys in comprehensions
core_lib: Teach is_var_used/2 to handle keys in map patterns
warnings_SUITE: Eliminate compiler warning for a shadowed variable
lc_SUITE: Add shadow/1
Modernize lc_SUITE
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* bjorn/compiler/coverage:
sys_core_fold: Remove uncovered clauses matching #c_map{}
beam_z: Remove the uncovered to_typed_literal/1 function
Speed up running of compiler test suites in coverage mode
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When translating a function with map construction:
f(A) ->
B = b,
C = c,
#{A=>1,B=>2,C=>3}.
v3_core would break apart the map construction into three
parts because of the way the map instructions in BEAM work --
variable keys need to be in their own instruction.
In the example, constant propagation will turn two of the
keys to literal keys. But the initial breaking apart will
not be undone, so there will still be three map constructions:
'f'/1 =
fun (_cor0) ->
let <_cor3> = ~{::<_cor0,1>}~
in let <_cor4> = ~{::<'b',2>|_cor3}~
in ~{::<'c',3>|_cor4}~
It would be possible to complicate the sys_core_fold pass
to regroup map operations so that we would get:
'f'/1 =
fun (_cor0) ->
let <_cor3> = ~{::<_cor0,1>}~
in ~{::<'b',2>,::<'c',3>|_cor3}~
A simpler way that allows to simplify the translation is
to skip the grouping in v3_core and translate the function
to:
'f'/1 =
fun (_cor0) ->
~{::<_cor0,1>,::<'b',2>,::<'c',3>}~
We will then let v3_kernel do the grouping while translating
from Core Erlang to Kernel Erlang.
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A map key in a pattern would be incorrectly pretty-printed.
As an example, the pattern in:
x() ->
#{ #{ a => 3 } := 42 } = X.
would be pretty-printed as:
<~{~<~{~<'a',3>}~,42>}~
instead of:
<~{~<~{::<'a',3>}~,42>}~
When this problem has been corrected, the workaround for it in
cerl:ann_c_map/3 can be removed. The workaround was not harmless,
as it would cause the following map update to incorrectly succeed:
(#{})#{a:=1}
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sys_core_fold:eval_element/3 attempts to evaluate calls to element/2
at compile time or to warn when the call will obviously fail. For
example:
element(1, [a])
will obviously fail and eval_element/3 will produce a warning.
eval_element/3 uses the helper functions is_not_integer/1 and
is_not_tuple/1 to test whether the arguments are known to be
incorrect. The clauses that attempt to match #c_map{} in those
helper function will never be executed, because #c_map{} will
never occur directly in an argument for a function call.
For example, code such as:
element(1, #{a=>Val})
will be translated to:
let <NewVar> = #{a=>Val}
in element(1, NewVar)
since maps are not considered safe (some map operations may
cause an exception at run time).
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When we compile from Core Erlang, do it with and without
Core Erlang optimizations to ensure that we are not dependent
on the optimizations always being run.
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v3_core is careful to always create literals whenever possible.
Correct core_parse so it, too, always creates literals out
of literal conses. With that correction, we can remove the
workaround in sys_core_fold (introduced in 26a5dea3cb5e101)
that handles non-literal flags in a binary.
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It was a workaround for a bug that has been fixed.
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I have spent too much time lately waiting for 'cover' to finish,
so now its time to optimize the running time of the tests suite
in coverage mode.
Basically, when 'cover' is running, the test suites would not
run any tests in parallel. The reason is that using too many
parallel processes when running 'cover' would be slower than
running them sequentially. But those measurements were made
several years ago, and many improvements have been made to
improve the parallelism of the run-time system.
Experimenting with the test_lib:p_run/2 function, I found that
increasing the number of parallel processes would speed up the
self_compile tests cases in compilation_SUITE. The difference
between using 3 processes or 4 processes was slight, though,
so it seems that we should not use more than 4 processes when
running 'cover'.
We don't want to change test_lib:parallel/0, because there is
no way to limit the number of test cases that will be run in
parallel by common_test. However, there as test suites (such as
andor_SUITE) that don't invoke the compiler at run-time. We can
run the cases in such test suites in parallel even if 'cover'
is running.
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The hipe_bifs:make_native_stub/2 and hipe_bifs:get_emu_address/1
BIFs were originally used by hipe_unified_loader.erl, but the
code been obsolete and disabled for ages.
Remove the BIFs and all references to them.
In hipe_unified_loader.erl, remove the no-op emu_make_stubs/1
function.
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The HIPE_ALLOC_CODE macro in the HiPE runtime was introduced
ages ago to allow x86 and amd64 to switch from erts_alloc()
to an mmap() implementation with proper flag setting. Nowadays
the macro is identical on all platforms, and serves no purpose.
Delete the macro, move the hipe_alloc_code() prototype to
hipe_arch.h, and simplify hipe_bifs_enter_code_2().
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* vladdu/edoc_remove_packages/OTP-12431:
[edoc] remove functionality related to packages
[edoc] add test for nested source directories
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Maps have certain invariants that must be preserved:
(1) A map as a pattern must be represented as #c_map{} record,
never as a literal. The reason is that the pattern '#{}' will
match any map, not just the empty map. The literal '#{}' will
only match the empty map.
(2) In a map pattern, the key must be a literal, a variable, or
data (list or tuple). Keys that are binaries or maps *must* be
represented as literals.
(3) Maps in expressions should be represented as literals if possible.
Nothing is broken if this invariant is broken, but the generated
code will be less efficient.
To preserve invariant (1), cerl:update_c_map/3 must never collapse
a map to a literal. To preserve invariant (3), cerl:update_c_map/3
must collapse a map to a literal if possible.
To preserve both invariants, we need a way for cerl:update_c_map/3 to
know whether the map is used as a pattern or as an expression. The
simplest way is to have an 'is_pat' boolean in the #c_map{} record
which is set when a #c_map{} record is initially created.
We also need to update core_parse.yrl to establish the invariants
in the same way as v3_core, to ensure that compiling from a
.core file will work even if all optimizations on Core Erlang are
disabled.
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We used to evaluate the body of a 'letrec' in value context, even
if the 'letrec' was being evaluated in effect context. In most
cases, the context does not matter because the body is usually
just an 'apply' which will never be optimized away.
However, in the case of incorrect code described in the previous
commit, it does matter. We can find such bad code by evaluating
the body in effect context. For example, if we have the following
incorrect code:
letrec
f/1 = fun(A) -> ... <use of Var> ...
in let Var = <<2:301>>
in apply(Arg)
If the letrec is evaluated in effect context, the code will be
reduced to:
letrec
f/1 = fun(A) -> ... <use of Var> ...
in seq Var = <<2:301>> do apply(Arg)
Now Var will be unbound and a later compiler pass will crash to
ensure that the bad Core Erlang code is noticed.
Also add a test case to ensure that the compiler crashes if the
bug fixed in the previous commit re-surfaces.
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The translation of list comprehension with a map pattern
with a big literal binary as key such as:
lc(L) ->
[V || #{<<2:301>> := V} <- L].
would generate Core Erlang code where an unbound variable
were referenced:
'lc'/1 =
fun (L) ->
letrec
'lc$^0'/1 = fun (_cor4) ->
case _cor4 of
<[~{~<_cor1,V>}~|_cor3]> when 'true' ->
let <_cor5> = apply 'lc$^0'/1(_cor3)
in [V|_cor5]
<[_cor2|_cor3]> when 'true' ->
apply 'lc$^0'/1(_cor3)
<[]> when 'true' ->
[]
end
in let <_cor1> = #{#<2>(301,1,'integer',['unsigned'|['big']])}#
in apply 'lc$^0'/1(L)
In the map pattern in the 'case' in the 'letrec', the key is the
variable '_cor1' which should be bound in the enclosing environment.
It is not.
There is binding of '_cor1', but in the wrong place (at the end of
the function). Because of the way v3_kernel translates letrecs,
the code *happens* to work.
The code will break if Core Erlang optimizations were strengthened
to more aggressively eliminate variable bindings that are not used,
or if the translation from Core Erlang to Kernel Erlang were changed.
Correct the translation so that '_cor1' is bound in the environment
enclosing the 'letrec':
'lc'/1 =
fun (L) ->
let <_cor1> = #{#<2>(301,1,'integer',['unsigned'|['big']])}#
in letrec
'lc$^0'/1 = fun (_cor4) ->
case _cor4 of
<[~{~<_cor1,V>}~|_cor3]> when 'true' ->
let <_cor5> = apply 'lc$^0'/1(_cor3)
in [V|_cor5]
<[_cor2|_cor3]> when 'true' ->
apply 'lc$^0'/1(_cor3)
<[]> when 'true' ->
[]
end
in apply 'lc$^0'/1(L)
Unfortunately I was not able to come up with a test case that
demonstrates the bug.
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* s1n4/httpc_invalid_set_cookies/OTP-12430:
httpc: Avoid parsing invalid 'Set-Cookie' headers
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is_var_used/2 did not notice that variable keys in map patterns
were used, which could cause sys_core_fold to do unsafe
optimizations.
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Remove ?line macros. Run test cases in parallel.
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* sverk/port_get_data-race-r16b03/OTP-12208:
erts: Fix port data memory allocation bug
erts: Mend port_set_data with non-immed data for halfword VM
erts: Add test case for port_set_data and port_get_data
erts: Fix race between port_set_data, port_get_data and port termination
erts: Fix erlang:port_set_data/2 for non immediate data
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* marcus/16/fix-rebuild:
Sort keys before generating
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* ia/ssh/sftp-v3-flags:
ssh: Add some more flags
ssh: Correct Sftp flag handling
ssh: Add handling of sftp v3 flags
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* ia/ssl/poddle/OTP-12390:
ssl: Remove default support for RC4 ciphers
ssl: Reenable padding check for TLS-1.0 and provide backwards compatible disable option
ssl: Remove sslv3 from the default supported protocol versions
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* ia/ssl/maint/poddle/OTP-12420:
ssl: Reenable padding check for TLS-1.0 and provide backwards compatible disable option
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* egil/fix-maps-compiler-coverage/OTP-12425:
compiler: Rename util function to adhere to name policy
compiler: Remove get_map_elements label check in blocks
compiler: Remove unnecassary guard for get_map_elements
compiler: Remove dead code in beam_flatten
compiler: Increase Maps code coverage
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