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2017-06-14Update copyright yearHans Nilsson
2017-06-07Fix unsafe bit syntax matching optimizationBjörn Gustavsson
As part of sys_core_fold, variables involved in bit syntax matching would be annotated when it would be safe for a later pass to do the delayed sub-binary creation optimization. An implicit assumption regarding the annotation was that the code must not be further optimized. That assumption was broken in 05130e48555891, which introduced a fixpoint iteration (applying the optimizations until there were no more changes). That means that a variable could be annotated as safe for reusing the match context in one iteration, but a later iteration could rewrite the code in a way that would make the optimization unsafe. One way to fix this would be to clear all reuse_for_context annotations before each iteration. But that would be wasteful. Instead I chose to fix the problem by moving out the annotation code to a separate pass (sys_core_bsm) that is run later after all major optimizations of Core Erlang has been done.
2017-03-24compiler: Add is_tagged_tuple instructionBjörn-Egil Dahlberg
Rewrite the instruction stream on tagged tuple tests. Tagged tuples means a tuple of any arity with an atom as its first element. Typically records, ok-tuples and error-tuples. from: ... {test,is_tuple,Fail,[Src]}. {test,test_arity,Fail,[Src,Sz]}. ... {get_tuple_element,Src,0,Dst}. ... {test,is_eq_exact,Fail,[Dst,Atom]}. ... to: ... {test,is_tagged_tuple,Fail,[Src,Sz,Atom]}. ...
2017-01-12Makefile: Warn for missings specBjörn Gustavsson
2016-11-18Remove beam_boolBjörn Gustavsson
The guard optimizations in v3_kernel has removed the need for beam_bool.
2016-09-01Remove sys_pre_expandBjörn Gustavsson
The previous commits have made sys_pre_expand superfluous. Since sys_pre_expand is undocumented and unsupported it can be removed in a major release without prior deprecation. Also remove code in erl_parse that handles abstract code that has passed through sys_pre_expand. We considered deprecating sys_pre_expand just in case, but decided against it for the following reasons: - Anyone brave and knowledgeable enough to use sys_pre_expand should be able to cope with sys_pre_expand being removed. - If we kept it, but didn't test it anywhere in OTP, it could potentially stop working. So we would probably have to add some test cases.
2016-03-15update copyright-yearHenrik Nord
2015-09-28Move out bit syntax optimizations from beam_blockBjörn Gustavsson
In the future we might want to add more bit syntax optimizations, but beam_block is already sufficiently complicated. Therefore, move the bit syntax optimizations out of beam_block into a separate compiler pass called beam_bs.
2015-08-21Delay get_tuple_element instructions until they are neededBjörn Gustavsson
When matching tuples, the pattern matching compiler would generate code that would fetch all elements of the tuple that will ultimately be used, *before* testing that (for example) the first element is the correct record tag. For example: is_tuple Fail {x,0} test_arity Fail {x,0} 3 get_tuple_element {x,0} 0 {x,1} get_tuple_element {x,0} 1 {x,2} get_tuple_element {x,0} 2 {x,3} is_eq_exact Fail {x,1} some_tag If {x,2} and {x,3} are not used at label Fail, we can re-arrange the code like this: is_tuple Fail {x,0} test_arity Fail {x,0} 3 get_tuple_element {x,0} 0 {x,1} is_eq_exact Fail {x,1} some_tag get_tuple_element {x,0} 1 {x,2} get_tuple_element {x,0} 2 {x,3} Doing that may be beneficial in two ways. If the branch is taken, we have eliminated the execution of two unnecessary instructions. Even if the branch is never or rarely taken, there is the possibility for more optimizations following the is_eq_exact instructions. For example, imagine that the code looks like this: get_tuple_element {x,0} 1 {x,2} get_tuple_element {x,0} 2 {x,3} move {x,2} {y,0} move {x,3} {y,1} Assuming that {x,2} and {x,3} have no further uses in the code that follows, that can be rewritten to: get_tuple_element {x,0} 1 {y,0} get_tuple_element {x,0} 2 {y,1} When should we perform this optimization? At the very latest, it must be done before opt_blocks/1 in beam_block which does the elimination of unnecessary moves. Actually, we want do the optimization before the blocks have been established, since moving instructions out of one block into another is cumbersome. Therefore, we will do the optimization in a new pass that is run before beam_block. A new pass will make debugging easier, and beam_block already has a fair number of sub passes.
2015-06-18Change license text to APLv2Bruce Yinhe
2015-05-21compiler: Add cerl_sets moduleBjörn-Egil Dahlberg
A sets implementation based on maps.
2015-03-09Don't inline core_parseBjörn Gustavsson
Inlining the core_parse module is slow (the inline pass alone takes more than 6 seconds on my computer) and has no benefit.
2015-02-12Break out inlining of 'lists' functions to a new moduleBjörn Gustavsson
The code for inlining high-order functions from the lists module is quite annoying when you try to navigate the sys_core_fold module. Break out the code into its own module.
2013-01-25Update copyright yearsBjörn-Egil Dahlberg
2013-01-23Turn warnings to errors on selected applicationsBjörn Gustavsson
2013-01-18Merge branch 'nox/enable-silent-rules/OTP-10726'Björn-Egil Dahlberg
* nox/enable-silent-rules/OTP-10726: Implement ./otp_build configure --enable-silent-rules
2013-01-18Remove support for parameterized modulesBjörn Gustavsson
2013-01-15Implement ./otp_build configure --enable-silent-rulesAnthony Ramine
With silent rules, the output of make is less verbose and compilation warnings are easier to spot. Silent rules are disabled by default and can be disabled or enabled at will by make V=0 and make V=1.
2012-10-09Introduce the mandatory beam_a and beam_z passesBjörn Gustavsson
Introduce the mandary beam_a pass that will be run directly after code generation, and the mandatory beam_z pass that will be run just before beam_asm. Since these passes surround the optimizations, beam_a can (for example) do instruction renaming to simplify the optimization passes and beam_z can undo those renamings.
2012-08-31Update copyright yearsBjörn-Egil Dahlberg
2012-06-05Update to work with whitespace in exec pathLukas Larsson
OTP-10106 OTP-10107
2012-01-04Add the beam_except pass to optimize exceptionsBjörn Gustavsson
In order to save space, rewrite suitable calls to erlang:error/{1,2} to special BEAM instructions. This code is probably longer than the code taken out of v3_life and v3_codegen in the previous commit, but it is much easier to understand and maintain since the BEAM assembler format is better understood than the v3_life format.
2011-12-06Teach the compiler the 'no_dead' optionBjörn Gustavsson
To facilitate debugging of compiler bugs, teach the compiler the 'no_dead' option. Since the beam_dead pass used to do the necessary splitting of basic blocks to expose all labels, we must move that splitting into a separate pass that is always run.
2011-03-11Update copyright yearsBjörn-Egil Dahlberg
2011-02-02compiler Makefile: Turn warnings into errorsBjörn Gustavsson
We want to ensure that the compiler applications is kept free of warnings.
2010-05-11Optimize selective receives in the presence of a large message queueBjörn Gustavsson
If a gen_server process has many messages in its message queue and calls another gen_server process, the selective receive in gen_server:call() will have to go through the entire message queue. Have the compiler generate the new mark_recv/1 and mark_recv/1 instructions that can avoid going through the entire message queue.
2010-02-10Merge branch 'ks/compiler' into ccase/r13b04_devErlang/OTP
* ks/compiler: compiler: keep line numbers for attributes compiler Makefile: alphabetize module names compile.erl: eliminate compiler warning
2010-02-10Support the configure option --enable-native-libsKostis Sagonas
2010-02-10compiler Makefile: alphabetize module namesKostis Sagonas
2009-11-20The R13B03 release.OTP_R13B03Erlang/OTP