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The new code generator will more aggressively reuse registers,
so we must be more careful about updating the state for try/catch.
In particular, an "empty" try/catch that can't throw an
exception must not update the try/catch state.
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Nicer to read and less confusion.
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* maint:
Fix compiler crash when compiling double receives
erts: Delete fd from poll-set when closing fd_driver port
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remove_message just remove messages without writing to any register.
Compiler is already generating code like:
{get_tuple_element,{x,0},1,{x,0}}.
remove_message.
{jump,{f,6}}
That clearly uses x0 for other purposes.
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The compiler would crash when compiling a function with two
receive statements.
https://bugs.erlang.org/browse/ERL-703
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* maint:
Correct error behavior of is_map_key/2 in guards
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Correct error behavior of is_map_key/2 in guards
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Consider the following functions:
foo() -> bar(not_a_map).
bar(M) when not is_map_key(a, M) -> ok;
bar(_) -> error.
What will `foo/0` return? It depends. If the module is compiled
with the default compiler options, the return value will be
`ok`. If the module is compiled with the `inline` option,
the return value will be `error`.
The correct value is `error`, because the call to `is_map_key/2`
when the second argument is not a map should fail the entire
guard. That is the way other failing guards BIFs are handled.
For example:
foo() -> bar(not_a_tuple).
bar(T) when not element(1, T) -> ok;
bar(_) -> error.
`foo/0` always returns `error` (whether the code is inlined
or not).
This bug can be fixed by changing the classification of `is_map_key/2`
in the `erl_internal` module. It is now classified as a type test,
which is incorrect because type tests should not fail. Reclassifying
it as a plain guard BIF corrects the bug.
This correction also fixes the internal consistency check
failure which was reported in:
https://bugs.erlang.org/browse/ERL-699
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* maint:
Updated OTP version
Update release notes
Update version numbers
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* maint-21:
Updated OTP version
Update release notes
Update version numbers
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'john/compiler/fix-deterministic-include-paths/OTP-15204/ERL-679' into maint-21
* john/compiler/fix-deterministic-include-paths/OTP-15204/ERL-679:
Omit include path debug info for +deterministic builds
# Conflicts:
# lib/compiler/test/compile_SUITE.erl
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* maint:
Updated OTP version
Update release notes
Update version numbers
crypto: Fix crash in compute_key(ecdh, ...) on badarg
Relax add_table_copy restriction
Fixed #Ref ordering bug
Test #Ref ordering in lists and ets
Do NOT disc_load from ram_copies when master_node is set
ssl: Make sure that a correct cipher suite is selected
ssl: Correct handling of empty server SNI extension
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* maint-20:
Updated OTP version
Update release notes
Update version numbers
crypto: Fix crash in compute_key(ecdh, ...) on badarg
Relax add_table_copy restriction
Fixed #Ref ordering bug
Test #Ref ordering in lists and ets
Do NOT disc_load from ram_copies when master_node is set
ssl: Make sure that a correct cipher suite is selected
ssl: Correct handling of empty server SNI extension
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* maint:
Fix bug in binary matching
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bjorng/bjorn/compiler/binary-syntax/ERL-689/OTP-15219
Fix bug in binary matching
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* maint:
Omit include path debug info for +deterministic builds
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'john/compiler/fix-deterministic-include-paths/OTP-15204/ERL-679' into maint
* john/compiler/fix-deterministic-include-paths/OTP-15204/ERL-679:
Omit include path debug info for +deterministic builds
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Compiling the same file with different include paths resulted in
different files with the `+deterministic` flag even if everything
but the paths were identical. This was caused by the absolute path
of each include directory being unconditionally included in a
debug information chunk.
This commit fixes this by only including this information in
non-deterministic builds.
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* maint:
Fix side-effect optimization when compiling from Core Erlang
Conflicts:
lib/compiler/src/sys_core_fold.erl
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bjorng/bjorn/compiler/letrec-side-effect-fix/ERL-658/OTP-15188
Fix side-effect optimization when compiling from Core Erlang
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The compiler generates incorrect code for the following example:
decode_binary(_, <<Length, Data/binary>>) ->
case {Length, Data} of
{0, _} ->
%% When converting the match context back to a binary,
%% Data will be set to the entire original binary,
%% that is, to <<0>> instead of <<>>.
{{0, 0, 0}, Data};
{4, <<Y:16/little, M, D, Rest/binary>>} ->
{{Y, M, D}, Rest}
end.
The problem is the delayed sub binary creation optimization, which
is not safe to do in this case.
This commit introduces a heuristic that will disable the delayed
sub binary creation optimization for this example. Unfortunately, the
heuristic may turn off the optimization when it would actually be
safe. In the OTP codebase, the optimization is turned off in two
instances, once in string.erl and once in dets_v9.erl.
https://bugs.erlang.org/browse/ERL-689
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Rewrite erlang:get_stacktrace calls to primop when safe
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* maint:
Eliminate double computation of next var
beam_validator: Fix false diagnostic for a receive nested in a try
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Eliminate double computation of next var
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When an expression is only used for its side effects, we try to
remove everything that doesn't tie into a side-effect, but we
went a bit too far when we applied the optimization to funs
defined in such a context. Consider the following:
do letrec 'f'/0 = fun () -> ... whatever ...
in call 'side':'effect'(apply 'f'/0())
'ok'
When f/0 is optimized under the assumption that its return value
is unused, side:effect/1 will be fed the result of the last
side-effecting expression in f/0 instead of its actual result.
https://bugs.erlang.org/browse/ERL-658
Co-authored-by: Björn Gustavsson <[email protected]>
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My compiler benchmarks on modules with huge functions, show the
next_free_variable_name call to be expensive. It turns out one
of the 3 calls to the function was completely ignored.
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When nesting a receive in a try/catch, there could be a false
diagnostic that a fragile term is used.
https://bugs.erlang.org/browse/ERL-684
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This allows taking advantage of further optimisations, like the
raw_raise instruction for code that can't upgrade (yet) to the
new stacktrace syntax for compatibility reasons.
The rewrite is only done when it is safe - when the get_stacktrace
call is the very first thing the handler does.
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I did not find any legitimate use of "can not", however skipped
changing e.g RFCs archived in the source tree.
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* maint:
Abort size calculation when a matched-out variable is used
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jhogberg/john/compiler/fix-varsize-binary-comprehension/OTP-15186/ERL-665
Fix a crash when compiling variable-sized binary comprehensions
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Referencing a matched-out variable in a size expression makes it
impossible to calculate the size of the result based on the size of
the matched binary. The compiler would still generate code to do
this however, which would crash since the variable isn't defined
at the size calculation.
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* maint:
Call test_lib:recompile/1 from init_per_suite/1
beam_debug: Fix printing of floating point registers
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Call test_lib:recompile/1 from init_per_suite/1 instead of
from all/0. That makes it easy to find the log from the
compilation in the log file for the init_per_suite/1 test
case.
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* maint:
Updated OTP version
Update release notes
Update version numbers
Eliminate a crash in the beam_jump pass
stdlib: Fix a 'chars_limit' bug
Fix a race condition when generating async operation ids
Fix internal compiler error for map_get/2
beam_type: Fix unsafe optimization
public_key: Remove moduli 5121 and 7167 Thoose were added by 598629aeba9de98e8cdf5637043eb34e5d407751 but are not universaly supported.
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maint-21
* bjorn/compiler/fix-beam_jump-crash/ERL-660/OTP-15166:
Eliminate a crash in the beam_jump pass
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* bjorn/compiler/fix-map_get/OTP-15157:
Fix internal compiler error for map_get/2
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maint-21
* bjorn/compiler/fix-skipped-matching/ERL-655/OTP-15156:
beam_type: Fix unsafe optimization
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https://bugs.erlang.org/browse/ERL-660
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Code such as that the following:
Val = map_get(a, Map),
Map#{a:=z} %Could be any map update
would incorrectly cause an internal consistency check failure:
Internal consistency check failed - please report this bug.
Instruction: {put_map_exact,{f,0},{x,0},{x,0},1,{list,[{atom,a},{atom,z}]}}
Error: {bad_type,{needed,map},{actual,term}}:
Update beam_validator so that it understands that the second
argument for map_get/2 is a map.
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beam_type assumed that the operand for the bs_context_to_binary
instruction must be a binary. That is not correct;
bs_context_to_binary accepts anything. Based on the incorrect
assumption, beam_type would remove other test instructions.
The bug was introduced in eee8655788d2, which was supposed
to be just a refactoring commit.
https://bugs.erlang.org/browse/ERL-655
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