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beam_bool would crash when attempting to optimize BEAM code similar
to this code:
bif '=:=' Reg1 SomeValue => y(0)
bif '=:=' Reg2 {atom,true} => x(2)
bif '=:=' Reg3 {atom,true} => x(3)
bif 'or' x(2) x(3) => x(2)
is_eq_exact Fail x(2) {atom,true}
The problem is that the first instruction that assigns a value to a Y
register. beam_bool:ssa_assign/2 will not accept a Y register
argument.
We could change ssa_assign/2 to accept a Y register, but that would
only cause the entire optimization to be rejected later because the Y
register is alive in the code that follows. Therefore, a better
solution is to modify extend_block/3 so that the instruction that
assign to Y registers are not added to the block. That is, the
optimizer will only operate on the following code:
bif '=:=' Reg2 {atom,true} => x(2)
bif '=:=' Reg3 {atom,true} => x(3)
bif 'or' x(2) x(3) => x(2)
is_eq_exact Fail x(2) {atom,true}
Usually the optimization will succeed, rewriting the four instructions
to a select_val instruction.
Assembly code such as the above can be produced by code similar to:
Y = Something == SomethingElse,
case Y of
Condition; OtherCondition ->
. . .
end,
. . .,
Y.
Reported-by: http://bugs.erlang.org/browse/ERL-143
Reported-by: José Valim
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It's time that we have a dedicated test suite for beam_bool.
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Two test cases were not actually run. Even if their main purpose is to
ensure that the compiler doesn't crash, we always try to also run the
test case (when practial) to also ensure that the generated code is
correct.
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* Also remove old line algorithm
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Add images to common_test logs.
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Must call erl_init() to create mutex "ei_gethost_sem".
The lazy initialization done in my_gethostbyname_r
is not thread-safe.
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* egil/erts/nif-format_term/OTP-13580:
runtime_tools: Change erts_snprintf to enif_snprintf
erts: Document enif_snprintf
erts: Add tests for enif_snprintf
erts: Add enif_snprintf
Conflicts:
erts/emulator/beam/erl_nif_api_funcs.h
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* egil/tools/fix-unmatched_return/OTP-13595:
xref: Fix unmatched return warnings
tags: Fix unmatched return warnings
lcnt: Fix unmatched return warnings
fprof: Fix unmatched return warnings
fprof: Fix unmatched return warnings
eprof: Fix unmatched return warnings
cover: Fix unmatched return warnings
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* egil/runtime_tools/fix-unmatched_return/OTP-13595:
runtime_tools: Fix unmatched return warnings
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* egil/os_mon/fix-unmatched_return/OTP-13595:
os_mon: Fix unmatched return warnings
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* egil/et/fix-doc-lint:
et: Fix linting documentation xml tags
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* egil/runtime_tools/fix-doc-lint:
runtime_tools: Fix tags of dbg reference manual
runtime_tools: Fix tags of LTTng User's Guide
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* egil/percept/fix-ug-doc:
egd: Fix User's Guide lint
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* egil/erts-epmd/modernize-tests:
Eliminate use of doc and suite clauses
Replace use of test_server:format/2 with io:format/2
Modernize use of timetraps
Remove ?line macros
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Exported functions in this file should appear at the top of the file.
Also add missing spaces after commas.
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I can't remember that clause ever trigger during development.
Remove it to eliminated an uncovered line.
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check_liveness/3 returns {unknown,State} if an instruction is
not handled. All callers will handle 'unknown' the same way as
'used'. Therefore, we can simplify the code and improve the
coverage if we return {used,State} instead of {unknown,State}.
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All callers only calls code_at/2 for existing labels and they don't
handle the return value 'none'.
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30cc5c902d moved try/3 instruction inside blocks, so the clause for
handling try/3 in live_opt/4 is never executed.
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Two lines were never covered, because '[]' was used instead of 'nil'.
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The clause for handling #c_values{} in is_simple_term/1 is never
executed. It can be safely removed, since there is a default clause
that will return 'false' in the extremly unlikely event that a
Without the clause, code such as:
let <_v1,_v2> = <1,2>
in {_v1,_v2}
would be printed with an extra newline:
let <_v1,_v2> =
<1,2>
in {_v1,_v2}
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Don't try to be nice. Since we now have good test suites for
Core Erlang, just let it crash.
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We will get more information if we don't catch the exception.
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Map patterns are never represented as literals. Therefore, a map
literal should always be printed with the 'assoc' operator. That also
means that there is no remaining use of the 'class' field and that it
can be removed from the 'ctxt' record.
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The inliner generates variable whose names are numeric. Run
the inliner to cover one more line in core_pp.
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Several test cases in compile_SUITE (e.g. core/1) extracts the
abstract code from a BEAM file and runs the compiler on it.
It is only a waste of time to use the abstract code from
cloned versions of test case modules. That is, use record_SUITE,
but don't use record_no_opt_SUITE, record_post_opt_SUITE, or
record_inline_SUITE since they all contain essentially the same
abstract code.
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Add is_cloned_mod(Mod) to determine whether Mod is the original
name for a module (e.g. record_SUITE) or a cloned module
(e.g. record_no_opt_SUITE).
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Recent spring cleaning in the test suite left a line in sys_core_fold
dealing with an unnecessary catch uncovered.
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Correct calculation of the number of parallel processes to use
when cover is used. It was supposed not to exceed 4 (according to
the comment), but it was calculated as the number of schedulers.
On my computer, having 8 schedulers, this change made the compiler
test suite with cover run almost twice as fast.
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* bjorn/asn1/dialyzer-warnings/OTP-13579:
Eliminate dialyzer warnings for unmatched returns
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* bjorn/common_test/dialyzer-warnings:
ct_logs: Eliminate dialyzer warnings
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* mururu/stdlib/fix-deprecated-warnings/PR-1050/OTP-13594:
Fix deprecated warnings
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* bjorn/compiler/badfun-literal/ERL-138/OTP-13552:
sys_core_fold: Don't generated failing calls such as 3(4)
fun_SUITE: Test for failing calls to funs
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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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Fix mistakes found by 'xmllint'.
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Fix mistakes found by 'xmllint'.
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Optimize by using a map instead of a dict for precompiled objects.
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