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to handle "lookup without refc++" correctly
which was introduced in 4dcb2ae7810a507b701a30072b2f514cab7ebbdb.
When decrementing refc to zero (in try_delete or prepare_try_delete)
we must always wait thread progress to make sure no thread has done
lookup without refc++ and is just about to do refc++ and thereby revive
the DistEntry. That is, we wait for a potential other thread to either
do refc++ or drop its pointer to the DistEntry.
And if that other thread does refc++ (in erts_ref_dist_entry)
it must also do the extra refc++ for the scheduled pending delete.
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Add 'used' option for binary_to_term/2
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HiPE: Support for literal tag, tests and bugfixes
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Add internal documentation for the beam_makeops script
OTP-14626
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The 's' operand overloads the tags for pids and ports to represent
X and Y registers, respectively. At load time, refuse to load the
module if the "literal" term is not a pid or port, as it would be
interpreted as a register.
This does not happen with normally compiled code, but it can happen
if the compiler (or beam_asm) is abused like in the following example:
make_bad() ->
Pid = self(),
Forms = [{attribute, 0, module, bad_s_operand},
{attribute, 0, export, [{test, 0}]},
{function, 0, test, 0,
[{clause, 0, [], [],
[{call,0,{atom,0,tuple_size},[{integer, 0, Pid}]}]}]}],
{ok, Module, Bin} = compile:forms(Forms, [no_copt,no_postopt,report_errors]),
code:load_binary(Module, "bad_s_operand.erl", Bin).
With this commit applied, the following message will be printed
when make_bad() is run:
=ERROR REPORT==== 10-Nov-2017::14:47:59 ===
Loading of bad_s_operand.erl failed: badfile
=ERROR REPORT==== 10-Nov-2017::14:47:59 ===
beam/beam_load.c(2396): Error loading function bad_s_operand:test/0: op bif1_body: bsd:
the term '<0.60.0>' would be confused with a register
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* maint:
Updated OTP version
Update release notes
Update version numbers
inets: Prepare for release
inets: Add missing guard
Avoid WindowBits=8 as per the manual
Fix deflateParams on zlib 1.2.11
Ignore empty binaries in enif_inspect_iovec
Emasculate writable binaries on entering an iovec
Only apply EOS behaviors if there's pending data
Conflicts:
OTP_VERSION
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* maint-20:
Updated OTP version
Update release notes
Update version numbers
inets: Prepare for release
inets: Add missing guard
Avoid WindowBits=8 as per the manual
Fix deflateParams on zlib 1.2.11
Ignore empty binaries in enif_inspect_iovec
Emasculate writable binaries on entering an iovec
Only apply EOS behaviors if there's pending data
Stop assuming that all schedulers are managed when updating msacc
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Symptom: random rpc net_adm:ping returned pang
Use monitor_node to wait for failed connection
before we try to connect again.
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for "+hmqd off_heap"
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* john/erts/fix-gunzip-eos/OTP-14730/ERL-507:
Only apply EOS behaviors if there's pending data
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* john/erts/msacc-dirty-schedulers/OTP-14707:
Stop assuming that all schedulers are managed when updating msacc
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* john/erts/misc-iovec-issues/OTP-14745/OTP-14750:
Ignore empty binaries in enif_inspect_iovec
Emasculate writable binaries on entering an iovec
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1.2.11 started bailing when avail_out==0 regardless of whether
there's anything to flush or not, and there's no point in adapting
the old method since it was vulnerable to bugs in other zlib
versions which updated the deflate parameters even on failure.
The api_deflateParams test has been expanded accordingly, and two
white-box cases in zip_usage has been updated to make fewer
assumptions about the output; the validity of the compressed data
is what matters, not whether it's exactly the same as the test
vector.
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* sverker/systask-reqid-bug:
erts: Fix bug in systask scheduling
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* sverker/systask-reqid-bug:
erts: Fix bug in systask scheduling
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* sverker/cleanup-hipe_bs_validate_unicode:
erts: Remove obsolete hipe primop bs_validate_unicode
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The lack of this caused serious data corruption when a binary was
altered after entering the queue. This went unnoticed because it
was never used without erlang:iolist_to_iovec, which always
emasculates binaries.
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Don't allow defining an specific operation more than once with
the exact same operands. Don't allow a specific operation to be
defined with different arities.
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which was replaced by 'is_unicode' in 5369e34a892bfd8ab5aa98df330e3bbf19497b71
but kept for ABI compatibility in OTP-20.*.
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when request id is an immediate.
Ex:
erlang:garbage_collect(P, [{async,Immediate}]).
may crash the VM.
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It can easily be implemented as $OPERAND_POSITION($Operand) == 0.
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It is easy to to forget to use $REFRESH_GEN_DEST() in an instruction
that has a general destionation ('d'). Add a heuristic that should
catch most if not all such problems.
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In beam_emu, use "erts_gc_" for any function that does garbage
collection, as preparation for adding more sanity checks.
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Add an $IF() macro to conditionally expand macros. Use it like
this:
$IF(Expression, IfTrue, IfFalse)
Expression is a Perl expression that can be evaulated at macro
expansion time. If the expression evaluates to 0, the result will be
IfFalse, otherwise IfTrue.
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Although the terminology "arguments" is used in the comments
for beam_makeops, the documentation in beam_makeops.md consistenly
use the term "operand". Since the name of the macro is user-facing,
it should be consistent with the documentation.
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Make it easier to define new macros.
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Literal tags are used by the VM as an alternative to reserving a large
virtual memory space in order to be able to quickly identify which terms
are literals. The use of literal tags harms performance, but is useful
to support systems where allocating a large amount of virtual memory is
not an option.
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Since gcunsafe values are live over is_divisible calls (although only
the happy path, which never GCd), it should be a primop so there cannot
be any GCs.
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When the code switches from printf() to erts_printf() the output
becomes garbled. Fixed by fflush()ing stdout first.
Fixed formatting of the "H E A P" banner for 64-bit systems.
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which was lost in merge 3ec66701f91eba6a7a12a813b2283c2e733f62c1
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Fix hipe bug in binary <<X/utf32>> construction
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by introducing new primop 'is_unicode'
with no exception (ab)use and no GC.
Replaces bs_validate_unicode which is kept for backward compat for now.
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Fix for x86_64 only.
The calling native code can not handle a GC
as it has a raw pointer where to write the binary data.
If a GC happens the data (utf32) will be written
to the old deallocated heap.
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OTP-13760
SCTP connect could return error even if the connect is ongoing
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Any type that is a lower-case letter is allowed in a transformation,
even though some of them don't make sense, could cause compilation
errors when building the emulator, or crash at runtime. For example,
the type 'z' is emitted by the compiler, but eaten by the loader
before the transform engine can see it. Another example is the 'q'
type, which would crash the emulator if it was used on the right
side of a transformation rule.
In beam_makeops, define explicitly which types that are allowed in
patterns (on the left side) and in construction (on the right side).
Using that information, check the transformation rules thoroughly and
reject operands that don't make sense.
While we are it, also correct some misleading comments.
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* lukas/erts/misc_fixes:
erts: Fix a bunch of compiler warnings
kernel: Fix gen_tcp_misc indentation
erts: Fail port_SUITE:huge_env if error code > 127
erts: Add lcnt prototype for dist locks update
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* lukas/erts/pgo/OTP-14604:
erts: Only do PGO if gcc supports -fprofile-correction
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Correct erlang:is_builtin/3 for apply/2 and yield/0
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* maint:
erl_process_dump: Don't assume that literals can be found
Remove one superfluous closing parenthesis in oam_intro.xml
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Native code does not register its literals in the code header for the
loaded code. Therefore, a literal created by native code can not be
found by mark_literal(). Ignore literals that can't be found instead
of crashing (the crasdump_viewer will report such literals as
incomplete heap data, but will not crash).
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