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2016-05-23Merge branch 'bjorn/compiler/misc'Björn Gustavsson
* bjorn/compiler/misc: beam_bool_SUITE: Cover one more line beam_utils_SUITE: Cover more lines in beam_utils beam_reorder: Don't confuse beam_validator beam_bool: Reject potentially unsafe optimization v3_core: Don't depend on sys_core_fold for cleaning up beam_type: Eliminate crash beam_type: Correct handling of setelement/3 beam_validator: Handle cons literals better beam_validator: Keep better track of tuple literals
2016-05-23beam_bool_SUITE: Cover one more lineBjörn Gustavsson
2016-05-23beam_utils_SUITE: Cover more lines in beam_utilsBjörn Gustavsson
By first adding a call to error/1 to each uncovered line, QuickCheck could find test cases that would cover the lines.
2016-05-23beam_reorder: Don't confuse beam_validatorBjörn Gustavsson
Make sure we don't optimize code such as: is_tuple Fail Src test_arity Fail Src Arity get_tuple_element Src Pos Dst is_map Fail Src If we would reorder the instructions like this: is_tuple Fail Src test_arity Fail Src Arity is_map Fail Src get_tuple_element Src Pos Dst beam_validator would complain that the type for Src is a map instead of a tuple. Since the code has problems to begin with, there is no need to do the optimization.
2016-05-23beam_bool: Reject potentially unsafe optimizationBjörn Gustavsson
When calculating the sets of registers that must be killed or unused, registers set in a {protected,_,_,_} block were not considered. That could result in a crash in the assertion in beam_utils:live_opt_block/4.
2016-05-23v3_core: Don't depend on sys_core_fold for cleaning upBjörn Gustavsson
a3ec2644f5 attempted to teach v3_core not to generate code with unbound variables. The approach taken in that commit is to discard all expressions following a badmatch. That does not work if the badmatch is nested: {[V] = [] = foo,V}, V That would be rewritten to: {error({badmatch,foo})}, V where V is unbound. If we were to follow the same approach, the tuple construction code would have to look out for a badmatch. As would list construction, begin...end, and so on. Therefore, as it is impractical to discard all expressions that follow a badmatch, the only other solution is to ensure that the variables that the pattern binds will somehow be bound. That can be arranged by rewriting the pattern to a pattern that binds the same variables. Thus: error({badmatch,foo}), E = foo, case E of {[V],[]} -> V; Other -> error({badmatch,Other} end
2016-05-23beam_type: Eliminate crashBjörn Gustavsson
The following code: simple() -> case try 0 after [] end of 0 -> college; 1 -> 0 end. would crash the compiler like this: crash reason: {case_clause, {'EXIT', {function_clause, [{beam_type,simplify_select_val_int, [{select,select_val, {x,0}, {f,7}, [{integer,1},{f,9},{integer,0},{f,8}]}, 0], [{file,"beam_type.erl"},{line,169}]}, {beam_type,simplify_basic_1,3, [{file,"beam_type.erl"},{line,155}]}, {beam_type,opt,3,[{file,"beam_type.erl"},{line,57}]}, {beam_type,function,1,[{file,"beam_type.erl"},{line,36}]}, {beam_type,'-module/2-lc$^0/1-0-',1, [{file,"beam_type.erl"},{line,30}]}, {beam_type,module,2,[{file,"beam_type.erl"},{line,30}]}, {compile,'-select_passes/2-anonymous-2-',2, [{file,"compile.erl"},{line,521}]}, {compile,'-internal_comp/4-anonymous-1-',2, [{file,"compile.erl"},{line,306}]}]}}} The root cause is that the type representation is not well-defined. Integers could be represented in three different ways: integer {integer,{1,10}} {integer,0} However, only the first two forms were handled. To avoid similar problems in the future: * Make the type representation stricter. Make sure that integers are only represented as 'integer' or {integer,{Min,Max}}. * Call verify_type/1 whenever a new type is added (not only when merging types) to ensure that only the supported types are added to the type database). (ERL-150)
2016-05-20beam_type: Correct handling of setelement/3Björn Gustavsson
We must be careful how we treat the type info for the result of: setelement(Index, Tuple, NewValue) If Tuple had type information, the result of setelement/3 (in x(0)) would be assigned the same type information. But that is not safe for: setelement(1, Tuple, NewValue) since the type for the first element will be changed. Therefore, we must take care to remove the type information for the first element of the tuple if might have been modified by setelement/3.
2016-05-20beam_validator: Handle cons literals betterBjörn Gustavsson
As a preparation for better optimizations in beam_type, a list literal must be accepted as a 'cons'.
2016-05-20beam_validator: Keep better track of tuple literalsBjörn Gustavsson
As a preparation for upcoming better optimizations in beam_type, we will need to keep better track of tuple literals so that beam_validator will not falsely reject safe code.
2016-05-18Use arity() consistentlyKostis Sagonas
Specs of various *_arity functions in this module used different types (integer(), non_neg_integer(), byte()) to refer to the type arity().
2016-05-16Merge branch 'bjorn/compiler/beam_bool/ERL-143'Björn Gustavsson
* bjorn/compiler/beam_bool/ERL-143: Eliminate crash in beam_bool Add beam_bool_SUITE Add missing test cases in andor_SUITE and beam_block_SUITE
2016-05-16Eliminate crash in beam_boolBjörn Gustavsson
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
2016-05-16Add beam_bool_SUITEBjörn Gustavsson
It's time that we have a dedicated test suite for beam_bool.
2016-05-16Add missing test cases in andor_SUITE and beam_block_SUITEBjörn Gustavsson
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.
2016-05-13beam_utils: Correct break in conventions for split_even/1 and join_even/1Björn Gustavsson
Exported functions in this file should appear at the top of the file. Also add missing spaces after commas.
2016-05-13beam_utils: Remove clause checking for illegal set/4 instructionBjörn Gustavsson
I can't remember that clause ever trigger during development. Remove it to eliminated an uncovered line.
2016-05-13beam_utils: Simplify the return value for check_liveness/3Björn Gustavsson
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}.
2016-05-13beam_utils: Remove unused codeBjörn Gustavsson
2016-05-13beam_utils: Let code_at/2 fail if the label does not existBjörn Gustavsson
All callers only calls code_at/2 for existing labels and they don't handle the return value 'none'.
2016-05-13beam_utils: Remove unused handling of try/3 in live_opt/4Björn Gustavsson
30cc5c902d moved try/3 instruction inside blocks, so the clause for handling try/3 in live_opt/4 is never executed.
2016-05-13beam_utils: Correct translation of BIFs to testsBjörn Gustavsson
Two lines were never covered, because '[]' was used instead of 'nil'.
2016-05-13core_pp: Remove uncovered clause in is_simple_term/1Björn Gustavsson
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}
2016-05-13core_pp: Crash on unhandled Core Erlang formsBjörn Gustavsson
Don't try to be nice. Since we now have good test suites for Core Erlang, just let it crash.
2016-05-13core_pp: Remove unused clauses in unindent/3 to improve coverageBjörn Gustavsson
2016-05-13core_pp: Remove useless try...catchBjörn Gustavsson
We will get more information if we don't catch the exception.
2016-05-13core_pp: Simplify printing of map literalsBjörn Gustavsson
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.
2016-05-13compile_SUITE: Cover numeric variable names in core_ppBjörn Gustavsson
The inliner generates variable whose names are numeric. Run the inliner to cover one more line in core_pp.
2016-05-13compile_SUITE: Eliminate clones when re-compiling test suitesBjörn Gustavsson
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.
2016-05-13test_lib: Add is_cloned_mod/1Björn Gustavsson
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).
2016-05-13trycatch_SUITE: Cover the only uncovered line in sys_core_foldBjörn Gustavsson
Recent spring cleaning in the test suite left a line in sys_core_fold dealing with an unnecessary catch uncovered.
2016-05-13test_lib: Correct calculation of number of processesBjörn Gustavsson
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.
2016-05-12sys_core_fold: Don't generated failing calls such as 3(4)Björn Gustavsson
Rewrite code such as: X = not_a_fun, X() to: error({badfun,not_a_fun}) Also generate a warning.
2016-05-12fun_SUITE: Test for failing calls to funsBjörn Gustavsson
2016-05-09compiler: Let module_info(attributes) skip more attributesHans Bolinder
'callback' and 'optional_callbacks' are no longer wild attributes.
2016-04-29Merge branch 'bjorn/compiler/core-erlang-fixes'Björn Gustavsson
* bjorn/compiler/core-erlang-fixes: Slightly optimize core_pp v3_core: Don't depend on sys_core_fold for cleaning up
2016-04-28dialyzer: Unfold cerl patterns containing mapsMagnus Lång
Dialyzer relies heavily on the assumption that the type of a literal that is used as a pattern is the type of any value that can match that pattern. For maps, that is not true, and it was causing bad analysis results. A new help function dialyzer_utils:refold_pattern/1 identifies maps in literal patterns, and unfolds and labels them, allowing them to be properly analysed.
2016-04-28Slightly optimize core_ppBjörn Gustavsson
2016-04-28v3_core: Don't depend on sys_core_fold for cleaning upBjörn Gustavsson
v3_core would generate unsafe code for the following example: f() -> {ok={error,E}} = foo(), E. Internally, the code would look similar to: f() -> Var = foo(), error({badmatch,Var}), E. That is, there would remain a reference to an unbound variable. Normally, sys_core_fold would remove the reference to 'E', but if if optimization was disabled the compiler would crash.
2016-04-27compilation_SUITE: Use explicit exportsBjörn Gustavsson
With 'export_all' it is easy to add a new test case function and forget to add its name to the list of test cases to run. While we are it, remove unused functions and add the forgotten test case on_load_inline/1.
2016-04-27Remove support for running tests on a separate Erlang nodeBjörn Gustavsson
It has not been used for ages.
2016-04-27Move code from compilation_SUITE to beam_block_SUITEBjörn Gustavsson
2016-04-27Move list comprehension tests to lc_SUITEBjörn Gustavsson
2016-04-27Move catch tests to trycatch_SUITEBjörn Gustavsson
2016-04-27Remove compilation_SUITE:long_string/1Björn Gustavsson
long_string/1 was written to test that long string were handled efficiently in beam_asm. Strings used to be stored in the string table chunk, but are currently literals. There does not seem that this test case is likely to find any bugs.
2016-04-27Move pattern-matching tests to match_SUITEBjörn Gustavsson
2016-04-27Remove toothless test compile_SUITE:missing_testheap/1Björn Gustavsson
missing_testheap/1 is no longer relevant for the following reasons: 1) Because of the literal pool introduced in R12, no test_heap instructions are needed in the guards. 2) beam_validator would abort the compilation if any needed test_heap instructions were missing.
2016-04-27misc_SUITE: Add missing export of integer_encoding/0Björn Gustavsson
The integer_encoding/1 test is supposed to be run with a tighter timetrap ensure that encoding of integer in BEAM files is efficient enough.
2016-04-27Move test cases from compilation_SUITE to beam_utils_SUITEBjörn Gustavsson
beam_utils_SUITE didn't exist when the two test cases were written.
2016-04-27Move complex_guard/1 from compilation_SUITE to guard_SUITEBjörn Gustavsson