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2016-01-19erts: Ignore unexpected messages to erts_code_purgerSverker Eriksson
2016-01-13erts: Optimize erlang:check_process_codeSverker Eriksson
by ignoring literals. erts_internal:check_process_code will be called again anyway (with option {copy_literals, true}) before the module is actually purged. No need to check literals twice.
2016-01-13erts: Refactor check_process_code/3Sverker Eriksson
Move impl from erlang to erts_internal. Cut and paste.
2016-01-13erts: Make copy_literals more fail safeSverker Eriksson
* Same process must do enable-disable. * System process will force it and never get 'aborted'
2016-01-13erts: Move copy_literals/2 from erlang to erts_internalSverker Eriksson
as it's not a public interface.
2016-01-13erts: Make erlang:purge_module/1 safeSverker Eriksson
Problem: erlang:purge_module/1 is not safe in the sense that very bad things may happen if the code to be purged is still referred to by live processes. Introduce erts_internal:purge_module which is the same as the old erlang:purge_module BIF (except it returns false if no such old module). Implement erlang:purge_module in Erlang and let it invoke erts_code_purger for safe purging where all clogging processes first are killed.
2016-01-13erts: Refactor code:purge/1 and code:soft_purge/1Sverker Eriksson
by moving code from code_server to erts_code_purger. This is more or less a copy-paste from code_server.erl to erts_code_purger.erl. All the inner mechanics of code:purge/1 and code:soft_purge/1 are unchanged.
2016-01-13erts: Introduce erts_code_purgerSverker Eriksson
as a system process with preloaded code.
2016-01-11Merge branch 'maint'Henrik Nord
Conflicts: OTP_VERSION
2016-01-11Merge branch 'maint-18' into maintHenrik Nord
2016-01-11Merge branch 'maint'Björn Gustavsson
* maint: Eliminate crash in v3_codegen
2016-01-11Eliminate crash in v3_codegenBjörn Gustavsson
The following code would crash v3_codegen: order(From) -> catch if From#{[] => sufficient} -> saint end. Before explaining the crash, first some background on the stack frame and the Y registers. Certain instructions, most notably the 'call' instructions, clobber all X registers. Before any such instruction, all X registers that have values that will be used after the call must be saved to Y registers (i.e. to the stack frame). adjust_stack/4 will be called when X registers must be saved. There is also another situation when X registers must be saved, namely within a 'catch' if we are about to execute any instruction that may cause an exception. Examples of such instructions are some guard BIFs (such as length/1) and construction of binaries or maps. Within a 'catch', X registers must be be saved because if an exception is thrown and catched all X registers will be destroyed. The same adjust_stack/4 function will be called for those instructions, but only if they occur within a 'catch'. There is actually one more complication. If there is code in a guard within a catch, the X registers should not be saved, because the code in a guard never clobbers any X registers that were alive before the guard code was entered. v3_codegen is written with the implicit assumption that code in guards never cause anything to be saved to Y registers. The code for building maps and binaries would incorrectly save X registers within a guard inside a 'catch'. For construction of binaries, that would mean that a useless but harmelss 'move' instruction was generated. But for construction of maps, the saving of the Y register would not be harmless. There would be a crash when attempting to merge #sr{} records. #sr{} records keeps track of the contents of X and Y registers. When two separate code paths are joined (e.g. at the end of 'case' statement), the register descriptors must be reconciled. Basically, the register descriptors for both paths must be identical. The #sr{} record for one path must not claim that {y,0} contains a certain value, while another path claims that {y,0} is dead. Thus, the crash occurs in sr_merge/2 when failing to reconcile the Y registers. To fix this bug this bug we will introduce a new function called maybe_adjust_stack/5. It will save X registers on the stack only if the code is inside a catch but not inside a guard. We will change all existing code to use this new function when appropriate. Reported-by: Thomas Arts
2016-01-08Updated OTP versionOTP-18.2.2Erlang/OTP
2016-01-08Update release notesErlang/OTP
2016-01-08Merge branch 'hans/ssh/keyboard_interactive0/OTP-13255' into maint-18Erlang/OTP
* hans/ssh/keyboard_interactive0/OTP-13255: ssh: update vsn.mk to 4.2.1 ssh: handle secondary ssh_msg_userauth_info_request message ssh: testcase for abnormal keyboard-interactive authentication
2016-01-08ssh: update vsn.mk to 4.2.1Hans Nilsson
2016-01-08ssh: handle secondary ssh_msg_userauth_info_request messageHans Nilsson
2016-01-08ssh: testcase for abnormal keyboard-interactive authenticationHans Nilsson
2016-01-08Merge branch 'maint'Björn Gustavsson
* maint: beam_bool: Fix unsafe optimization
2016-01-07Merge branch 'sverk/proc-dict-opt'Sverker Eriksson
OTP-13167 * sverk/proc-dict-opt: erts: Add new test case pdict_SUITE:mixed erts: Add 'fill_heap' to erts_debug:state_internal_state erts: Rename proc dict size to arraySize erts: Refactor proc dict with 'usedSlots' erts: Add sizeMask for faster proc dict indexing erts: Remove ProcDict.used erts: Add proc dict macros ERTS_PD_START/SIZE erts: Optimize away function "array_put" in proc dict erts: Optimize hashing in process dictionary
2016-01-07Merge branch 'sverk/hipe-mmap-config'Sverker Eriksson
* sverk/hipe-mmap-config: erts: Add config test for MAP_NORESERVE for hipe on 64-bit
2016-01-07erts: Add config test for MAP_NORESERVE for hipe on 64-bitSverker Eriksson
to get a nicer error on FreeBSD and others that does not support MAP_NORESERVE for mmap. Q: How to support this? A: Implement the "literal tag" in hipe or another way to reserve virtual address space in erl_mmap.c
2016-01-07Merge branch 'sverk/float_SUITE-arith'Sverker Eriksson
* sverk/float_SUITE-arith: erts: Add new test cases to float_SUITE
2016-01-07Merge branch 'sverk/check_process_code-fix'Sverker Eriksson
* sverk/check_process_code-fix: erts: Fix bug in check_process_code for literals
2016-01-07Merge branch 'bjorn/compiler/beam_bool/OTP-13208' into maintBjörn Gustavsson
* bjorn/compiler/beam_bool/OTP-13208: beam_bool: Fix unsafe optimization
2016-01-07beam_bool: Fix unsafe optimizationBjörn Gustavsson
beam_bool would make the following code unsafe (which would be reported by beam_validator): scotland(Echo) -> found(case Echo of Echo when true; Echo, Echo, Echo -> Echo; echo -> [] end, Echo = placed). found(_, _) -> million. Basically, beam_bool would see that the 'case' would always return the value of Echo. Thus: scotland(Echo) -> found(Echo, Echo = placed). The only problem is that beam_bool would also remove a 'move' instruction that would save Echo to the stack. Here is the assembly code for part of the function: {allocate_zero,1,1}. {move,{x,0},{y,0}}. %% Save Echo on stack. {bif,'=:=',{f,7},[{x,0},{atom,true}],{x,1}}. {bif,'=:=',{f,7},[{x,0},{atom,true}],{x,2}}. {bif,'=:=',{f,7},[{x,0},{atom,true}],{x,3}}. {bif,'and',{f,7},[{x,2},{x,3}],{x,2}}. {bif,'and',{f,7},[{x,1},{x,2}],{x,1}}. {jump,{f,8}}. {label,7}. {move,{atom,false},{x,1}}. {label,8}. {bif,'or',{f,6},[{atom,true},{x,1}],{x,1}}. {test,is_eq_exact,{f,6},[{x,1},{atom,true}]}. %% Jump never taken. {jump,{f,5}}. {label,6}. {test,is_eq_exact,{f,9},[{x,0},{atom,echo}]}. {move,nil,{x,0}}. {jump,{f,5}}. {label,9}. {test_heap,3,0}. {put_tuple,2,{x,0}}. {put,{atom,case_clause}}. {put,{y,0}}. {line,[{location,"t.erl",5}]}. {call_ext,1,{extfunc,erlang,error,1}}. {jump,{f,5}}. {label,5}. {test,is_eq_exact,{f,12},[{atom,placed},{y,0}]}. beam_bool would see that the is_eq_exact test at label 8 would always succeed. It could therefore remove most of the code before the jump to label 5. Unfortunately it also removed the essential move of Echo to the stack: {allocate_zero,1,1}. %% Instruction incorrectly removed: {move,{x,0},{y,0}}. {jump,{f,5}}. {label,5}. {test,is_eq_exact,{f,12},[{atom,placed},{y,0}]}. The root cause of the problem is that the 'move' instruction is included in the block of 'bif' instructions before label 8. Normally the 'move' instruction would not have been discarded, but because the left operand to the 'or' BIF is 'true', the entire block with 'bif' instructions are dropped. As far as I can see, there is no gain by including 'move' instructions in the first place. There is no way that better code will be produced. In fact, the entire optimization can be given up if 'move' instructions are found in the block. Thus we can fix this bug by never including any 'move' instructions in the block of 'bif' instructions. We can also remove all the code that deals with 'move' instructions within blocks. Reported-by: Thomas Arts
2015-12-30Merge branch 'maint'Rickard Green
* maint: Light weight statistics of run queue lengths Conflicts: erts/preloaded/ebin/erlang.beam
2015-12-30Merge branch 'rickard/rq-len/OTP-13201' into maintRickard Green
* rickard/rq-len/OTP-13201: Light weight statistics of run queue lengths
2015-12-30Light weight statistics of run queue lengthsRickard Green
- statistics(total_run_queue_lengths) - statistics(run_queue_lengths) - statistics(total_active_tasks) - statistics(active_tasks) Conflicts: erts/emulator/beam/erl_process.c
2015-12-30Merge branch 'maint'Rickard Green
* maint: Use monotonic time for call_time trace
2015-12-30Merge branch 'rickard/trace_call_time/OTP-13216' into maintRickard Green
* rickard/trace_call_time/OTP-13216: Use monotonic time for call_time trace
2015-12-30Merge branch 'rickard/ohmq-fixup/OTP-13047'Rickard Green
* rickard/ohmq-fixup/OTP-13047: Fix asynchronous BIF timer cancellation message reply
2015-12-29Fix asynchronous BIF timer cancellation message replyRickard Green
2015-12-28Merge branch 'maint'Zandra
2015-12-28Merge branch 'zandra/update-java-versions-doc' into maintZandra
* zandra/update-java-versions-doc: update java version in documentation OTp-13221
2015-12-28Merge branch 'maint'Zandra
2015-12-28Merge branch 'binarin/maint' into maintZandra
* binarin/maint: Don't wait for twice the delay_write timeout OTP-13220
2015-12-28Merge branch 'maint'Zandra
2015-12-28Merge branch 'legoscia/tls_dist_error_reporting' into maintZandra
* legoscia/tls_dist_error_reporting: Report bad options for outgoing TLS distribution Save error reasons for TLS distribution connections Report bad options for TLS distribution connections OTP-13219
2015-12-28Merge branch 'maint'Zandra
2015-12-28Merge branch 'josevalim/jv-map-fun-eval-maint' into maintZandra
* josevalim/jv-map-fun-eval-maint: Use full list of bindings when matching on map keys OTP-13218
2015-12-28Merge branch 'maint'Zandra
2015-12-28Merge branch 'lucafavatella/dialyzer-fun-call' into maintZandra
* lucafavatella/dialyzer-fun-call: Teach Dialyzer call to funs `M:F/A` (literal M, F, A) OTP-13217
2015-12-23Use monotonic time for call_time traceRickard Green
2015-12-22Merge branch 'maint'Anders Svensson
2015-12-22Merge branch 'maint-17' into maintAnders Svensson
2015-12-22Merge branch 'maint'Hans Nilsson
* maint: ssh: clean test specs
2015-12-22Merge branch 'hans/ssh/ssh_benchmark_SUITE' into maintHans Nilsson
* hans/ssh/ssh_benchmark_SUITE: ssh: clean test specs
2015-12-22ssh: clean test specsHans Nilsson
2015-12-22Merge branch 'maint'Hans Nilsson
* maint: ssh: add econnaborted to disconnect msgs in test suite ssh: fix the check that open-ssh supports certain pubkeys in a test suite
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