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* tool/transform_mjit_header.rb (separate_macro_and_code): return
macro and code separately as the name, and concat before output.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62214 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/transform_mjit_header.rb (find_decl): scan by regexp
instead of char-by-char loop. return nil when finished.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62213 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62212 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/transform_mjit_header.rb: print non-error messages to
STDOUT instead of STDERR. exit with false or abort instead of
exit 1.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62205 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/transform_mjit_header.rb: add word boundary anchors and
match whole word to get rid of false `static` declarations,
e.g., rb_str_new_static.
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62198 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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which has been developed by Takashi Kokubun <takashikkbn@gmail> as
YARV-MJIT. Many of its bugs are fixed by wanabe <s.wanabe@gmail.com>.
This JIT compiler is designed to be a safe migration path to introduce
JIT compiler to MRI. So this commit does not include any bytecode
changes or dynamic instruction modifications, which are done in original
MJIT.
This commit even strips off some aggressive optimizations from
YARV-MJIT, and thus it's slower than YARV-MJIT too. But it's still
fairly faster than Ruby 2.5 in some benchmarks (attached below).
Note that this JIT compiler passes `make test`, `make test-all`, `make
test-spec` without JIT, and even with JIT. Not only it's perfectly safe
with JIT disabled because it does not replace VM instructions unlike
MJIT, but also with JIT enabled it stably runs Ruby applications
including Rails applications.
I'm expecting this version as just "initial" JIT compiler. I have many
optimization ideas which are skipped for initial merging, and you may
easily replace this JIT compiler with a faster one by just replacing
mjit_compile.c. `mjit_compile` interface is designed for the purpose.
common.mk: update dependencies for mjit_compile.c.
internal.h: declare `rb_vm_insn_addr2insn` for MJIT.
vm.c: exclude some definitions if `-DMJIT_HEADER` is provided to
compiler. This avoids to include some functions which take a long time
to compile, e.g. vm_exec_core. Some of the purpose is achieved in
transform_mjit_header.rb (see `IGNORED_FUNCTIONS`) but others are
manually resolved for now. Load mjit_helper.h for MJIT header.
mjit_helper.h: New. This is a file used only by JIT-ed code. I'll
refactor `mjit_call_cfunc` later.
vm_eval.c: add some #ifdef switches to skip compiling some functions
like Init_vm_eval.
win32/mkexports.rb: export thread/ec functions, which are used by MJIT.
include/ruby/defines.h: add MJIT_FUNC_EXPORTED macro alis to clarify
that a function is exported only for MJIT.
array.c: export a function used by MJIT.
bignum.c: ditto.
class.c: ditto.
compile.c: ditto.
error.c: ditto.
gc.c: ditto.
hash.c: ditto.
iseq.c: ditto.
numeric.c: ditto.
object.c: ditto.
proc.c: ditto.
re.c: ditto.
st.c: ditto.
string.c: ditto.
thread.c: ditto.
variable.c: ditto.
vm_backtrace.c: ditto.
vm_insnhelper.c: ditto.
vm_method.c: ditto.
I would like to improve maintainability of function exports, but I
believe this way is acceptable as initial merging if we clarify the
new exports are for MJIT (so that we can use them as TODO list to fix)
and add unit tests to detect unresolved symbols.
I'll add unit tests of JIT compilations in succeeding commits.
Author: Takashi Kokubun <takashikkbn@gmail.com>
Contributor: wanabe <s.wanabe@gmail.com>
Part of [Feature #14235]
---
* Known issues
* Code generated by gcc is faster than clang. The benchmark may be worse
in macOS. Following benchmark result is provided by gcc w/ Linux.
* Performance is decreased when Google Chrome is running
* JIT can work on MinGW, but it doesn't improve performance at least
in short running benchmark.
* Currently it doesn't perform well with Rails. We'll try to fix this
before release.
---
* Benchmark reslts
Benchmarked with:
Intel 4.0GHz i7-4790K with 16GB memory under x86-64 Ubuntu 8 Cores
- 2.0.0-p0: Ruby 2.0.0-p0
- r62186: Ruby trunk (early 2.6.0), before MJIT changes
- JIT off: On this commit, but without `--jit` option
- JIT on: On this commit, and with `--jit` option
** Optcarrot fps
Benchmark: https://github.com/mame/optcarrot
| |2.0.0-p0 |r62186 |JIT off |JIT on |
|:--------|:--------|:--------|:--------|:--------|
|fps |37.32 |51.46 |51.31 |58.88 |
|vs 2.0.0 |1.00x |1.38x |1.37x |1.58x |
** MJIT benchmarks
Benchmark: https://github.com/benchmark-driver/mjit-benchmarks
(Original: https://github.com/vnmakarov/ruby/tree/rtl_mjit_branch/MJIT-benchmarks)
| |2.0.0-p0 |r62186 |JIT off |JIT on |
|:----------|:--------|:--------|:--------|:--------|
|aread |1.00 |1.09 |1.07 |2.19 |
|aref |1.00 |1.13 |1.11 |2.22 |
|aset |1.00 |1.50 |1.45 |2.64 |
|awrite |1.00 |1.17 |1.13 |2.20 |
|call |1.00 |1.29 |1.26 |2.02 |
|const2 |1.00 |1.10 |1.10 |2.19 |
|const |1.00 |1.11 |1.10 |2.19 |
|fannk |1.00 |1.04 |1.02 |1.00 |
|fib |1.00 |1.32 |1.31 |1.84 |
|ivread |1.00 |1.13 |1.12 |2.43 |
|ivwrite |1.00 |1.23 |1.21 |2.40 |
|mandelbrot |1.00 |1.13 |1.16 |1.28 |
|meteor |1.00 |2.97 |2.92 |3.17 |
|nbody |1.00 |1.17 |1.15 |1.49 |
|nest-ntimes|1.00 |1.22 |1.20 |1.39 |
|nest-while |1.00 |1.10 |1.10 |1.37 |
|norm |1.00 |1.18 |1.16 |1.24 |
|nsvb |1.00 |1.16 |1.16 |1.17 |
|red-black |1.00 |1.02 |0.99 |1.12 |
|sieve |1.00 |1.30 |1.28 |1.62 |
|trees |1.00 |1.14 |1.13 |1.19 |
|while |1.00 |1.12 |1.11 |2.41 |
** Discourse's script/bench.rb
Benchmark: https://github.com/discourse/discourse/blob/v1.8.7/script/bench.rb
NOTE: Rails performance was somehow a little degraded with JIT for now.
We should fix this.
(At least I know opt_aref is performing badly in JIT and I have an idea
to fix it. Please wait for the fix.)
*** JIT off
Your Results: (note for timings- percentile is first, duration is second in millisecs)
categories_admin:
50: 17
75: 18
90: 22
99: 29
home_admin:
50: 21
75: 21
90: 27
99: 40
topic_admin:
50: 17
75: 18
90: 22
99: 32
categories:
50: 35
75: 41
90: 43
99: 77
home:
50: 39
75: 46
90: 49
99: 95
topic:
50: 46
75: 52
90: 56
99: 101
*** JIT on
Your Results: (note for timings- percentile is first, duration is second in millisecs)
categories_admin:
50: 19
75: 21
90: 25
99: 33
home_admin:
50: 24
75: 26
90: 30
99: 35
topic_admin:
50: 19
75: 20
90: 25
99: 30
categories:
50: 40
75: 44
90: 48
99: 76
home:
50: 42
75: 48
90: 51
99: 89
topic:
50: 49
75: 55
90: 58
99: 99
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62197 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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compilation which is created by transforming a preprocessed vm.c.
This file will be used by JIT compiler's generated code which we are
going to have from succeeding commits.
Makefile.in: generate MJIT header for UNIX environments.
win32/Makefile.sub: generate MJIT header for mswin environments.
At initial merge, we're going to support only MinGW for Windows. So the
header installed by this file won't be used for short term, but we'll
add mswin support in a half year or so, for sure.
tool/transform_mjit_header.rb: New. This script was originally written as
minimize_mjit_header.rb by Vladimir N. Makarov <vmakarov@redhat.com> for
Feature 12589.
Then I refactored a little so that it can conform CodeClimate CI which is
currently set for Ruby's GitHub repository, and fixed some bugs and ported
it to work on Windows.
Also, as original minimize_mjit_header.rb takes too long time to run,
this is modified to skip minimization step because having *static*
unused definitions does not waste compilation time on -O2 since compiler
can skip to compile unused static functions. So this does no longer
"minimize" the header and is renamed.
This header installation does NOT include a header to automatically
export symbols used by MJIT. That's because original MJIT code was
failing to export symbols in the import header in macOS environment.
But I would like to have the functionality for maintainability in the
future. I'll manually export things but it would be just an intemediate
solution.
Patch by: Vladimir N. Makarov <vmakarov@redhat.com>
Part of: Feature 12589 and 14235.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62187 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62109 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62105 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/ruby_vm/models/bare_instructions.rb (predefine_attributes):
`sp_inc` attribute which may return negative values must be
signed `rb_snum_t`, to be signed-expanded at type promotion.
* vm_insnhelper.h (ADJ_SP): removed the workaround for platforms
where rb_num_t is wider than int.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/vcs.rb (DebugSystem#system): fix undefined local variable
error. as system doesn't accept `exception:` option before 2.6,
remove it from `opts`.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62101 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62097 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62090 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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Now that DISPATCH_ORIGINAL_INSN is introduced, we can replace
CALL_SIMPLE_METHOD with DISPATCH_ORIGINAL_INSN. These two macros
differ in size very much and results in this big difference in
compiled binary size. This changeset reduces the size of
vm_exec_core from 32,352 bytes to 27,008 bytes on my machine. As
a result it yields slightly better performance.
Closes [GH-1779].
-----------------------------------------------------------
benchmark results:
minimum results in each 3 measurements.
Execution time (sec)
name before after
so_ackermann 0.484 0.454
so_array 0.837 0.779
so_binary_trees 5.928 5.801
so_concatenate 3.473 3.543
so_count_words 0.201 0.222
so_exception 0.255 0.252
so_fannkuch 1.080 1.019
so_fasta 1.459 1.463
so_k_nucleotide 1.218 1.180
so_lists 0.499 0.484
so_mandelbrot 2.189 2.324
so_matrix 0.510 0.496
so_meteor_contest 3.025 2.925
so_nbody 1.319 1.273
so_nested_loop 0.941 0.932
so_nsieve 1.806 1.647
so_nsieve_bits 2.151 2.078
so_object 0.632 0.621
so_partial_sums 1.560 1.632
so_pidigits 1.190 1.183
so_random 0.333 0.353
so_reverse_complement 0.604 0.586
so_sieve 0.521 0.481
so_spectralnorm 1.774 1.722
Speedup ratio: compare with the result of `before' (greater is better)
name after
so_ackermann 1.065
so_array 1.075
so_binary_trees 1.022
so_concatenate 0.980
so_count_words 0.903
so_exception 1.009
so_fannkuch 1.059
so_fasta 0.997
so_k_nucleotide 1.032
so_lists 1.032
so_mandelbrot 0.942
so_matrix 1.028
so_meteor_contest 1.034
so_nbody 1.036
so_nested_loop 1.009
so_nsieve 1.097
so_nsieve_bits 1.035
so_object 1.018
so_partial_sums 0.956
so_pidigits 1.006
so_random 0.943
so_reverse_complement 1.032
so_sieve 1.083
so_spectralnorm 1.030
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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Now that sp_inc attributes are officially provided as inline
functions. Why not use them directly from the vm core, not just
by the compiler. By doing so, it is now possible for us to
optimize stack manipulations. We can now know exactly how many
words of stack space an instruction consumes before it actually
does. This changeset deletes some lines from insns.def because
they are no longer needed. As a result it reduces the size of
vm_exec_core function from 32,400 bytes to 32,352 bytes on my
machine.
It seems it does not affect performance:
-----------------------------------------------------------
benchmark results:
minimum results in each 3 measurements.
Execution time (sec)
name before after
loop_for 1.093 1.061
loop_generator 1.156 1.152
loop_times 0.982 0.974
loop_whileloop 0.549 0.587
loop_whileloop2 0.115 0.121
Speedup ratio: compare with the result of `before' (greater is better)
name after
loop_for 1.030
loop_generator 1.003
loop_times 1.008
loop_whileloop 0.935
loop_whileloop2 0.949
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62087 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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Instead of using magic numbers, let us define a series of attributes
and use them from the VM core. Proper function declarations makes
these attributes inlined in most modern compilers. On my machine
exact same binary is generated with or without this changeset.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62085 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62070 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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as it's helpful for debugging.
I'm not sure what's the good output for RubyVM::TraceInstructions, so I
left it as it is.
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which is only used by #router.
To make it private, we need to stop defining them on top-level.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62065 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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via current directory. It's kind of a global state and fragile to
implementation changes in other places, and how the `Dir.getwd` is set
is not obvious from just reading around `RubyVM::Dumper#initialize` if
it depends on the global state.
tool/ruby_vm/controllers/application_controller.rb: explicitly pass
destdir to RubyVM::Dumper.
tool/ruby_vm/scripts/insns2vm.rb: explicitly pass destdir parsed from
optparse.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62064 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62060 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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svn to git bridge on ci.ruby-lang.org sometimes stalls when
dcommitting some commits at once.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62059 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62058 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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This commit introduces new attribute handles_flame and if that is
_not_ the case, places ADD_PC right after INC_SP. This improves
locality of PC manipulations to prevents unnecessary register spill-
outs. As a result, it reduces the size of vm_exec_core from 32,688
bytes to 32,384 bytes on my machine.
Speedup is very faint, but certain.
-----------------------------------------------------------
benchmark results:
minimum results in each 3 measurements.
Execution time (sec)
name before after
so_ackermann 0.476 0.464
so_array 0.742 0.728
so_binary_trees 5.493 5.466
so_concatenate 3.619 3.395
so_count_words 0.190 0.184
so_exception 0.249 0.239
so_fannkuch 0.994 0.953
so_fasta 1.369 1.374
so_k_nucleotide 1.111 1.111
so_lists 0.470 0.481
so_mandelbrot 2.059 2.050
so_matrix 0.466 0.465
so_meteor_contest 2.712 2.781
so_nbody 1.154 1.204
so_nested_loop 0.852 0.846
so_nsieve 1.636 1.623
so_nsieve_bits 2.073 2.039
so_object 0.616 0.584
so_partial_sums 1.464 1.481
so_pidigits 1.075 1.082
so_random 0.321 0.317
so_reverse_complement 0.555 0.558
so_sieve 0.495 0.490
so_spectralnorm 1.634 1.627
Speedup ratio: compare with the result of `before' (greater is better)
name after
so_ackermann 1.025
so_array 1.019
so_binary_trees 1.005
so_concatenate 1.066
so_count_words 1.030
so_exception 1.040
so_fannkuch 1.043
so_fasta 0.996
so_k_nucleotide 1.000
so_lists 0.978
so_mandelbrot 1.004
so_matrix 1.001
so_meteor_contest 0.975
so_nbody 0.959
so_nested_loop 1.007
so_nsieve 1.008
so_nsieve_bits 1.017
so_object 1.056
so_partial_sums 0.989
so_pidigits 0.994
so_random 1.014
so_reverse_complement 0.996
so_sieve 1.010
so_spectralnorm 1.004
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62051 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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Just add comment by:
sed -i $'1i\\\n# -*- Autoconf -*-' tool/m4/*.m4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61983 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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This does not (yet) change anything. The generated configure file
is the identical to previous one (except several empty lines added
and deleted).
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61838 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/ytab.sed: fix for more old bison which does not support %lex-param
at yydestruct (missed at the previous commit).
define yy_stack_print macro to add `p` argument instead of
replacement at callers.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61832 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/ytab.sed: `p` is too short to distinguish alone from other
names. fix for more old bison which does not support %lex-param
at yydestruct. add `p` argument to non-prototype declaration of
yy_stack_print.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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At least, I confirmed bison 2.3 (because macOS uses the version).
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61816 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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give up CALL_ATTRIBUTE macro.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61802 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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`signed` is required for Rasbian (x86_64).
* tool/ruby_vm/views/_insn_stack_increase.erb: specify `signed` explicitly
for systems which use `unsigned` for `char` type.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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This was not requested :) but actually easier than the previous
so I just did it anyway.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61787 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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as requested by devs, support for BASERUBY prior to 2.1
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as requested by devs, support for BASERUBY prior to 2.3
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61785 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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Previous commit changed insns.def format. Now is the time for its
generators. In doing so I chose to modernize the system, not just
patch. My attempt includes
- extensive use of Onigumo regular expressions
- split from one big file (instruction.rb) into separated MVC
- partial view
Also, let me take this opportunity to kill old unused features
such as
- stack caching
- minsns / yasmdata which are never seriously used
- yarvarch document generation (moved to doc/)
- vast majority of unused arguments to insns2vm.rb
This commit generates VM source codes that cleanly compile, and
the generated binary passes tests. At least for me.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61784 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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- Gave up @j comments
- Room for sp_inc to be a proper grammer element
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61782 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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instead of Errno::ECONNREFUSED.
As I commented in r61498, at that moment I was not sure if the actual
exception is really `Errno::ECONNREFUSED` or not.
In https://ci.appveyor.com/project/ruby/ruby/build/1.0.6974, I could
confirm that the download can fail with `Errno::ETIMEDOUT`. So I want to
retry that.
Let's add `Errno::ECONNREFUSED` too if it fails with the exception.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61762 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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Revert all the VM generator rewrites; requested by naruse
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61755 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/ruby_vm/loaders/opt_operand_def.rb: grammer -> grammar
* tool/ruby_vm/scripts/insns2vm.rb: beginnig -> beginning
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61752 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* tool/ruby_vm/views/_insn_stack_increase.erb: specify `signed` explicitly
for systems which use `unsigned` for `char` type.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61746 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61744 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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baseruby should support wider ruby versions
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61741 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61736 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* template/insns_info.inc.tmpl (insn_name_info): make position
independent for large strings.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61735 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61734 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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Previous commit changed insns.def format. Now is the time for its
generators. In doing so I chose to modernize the system, not just
patch. My attempt includes
- extensive use of Onigumo regular expressions
- split from one big file (instruction.rb) into separated MVC
- partial view
Also, let me take this opportunity to kill old unused features
such as
- stack caching
- minsns / yasmdata which are never seriously used
- yarvarch document generation (moved to doc/)
- vast majority of unused arguments to insns2vm.rb
This commit generates VM source codes that cleanly compile, and
the generated binary passes tests. At least for me.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61733 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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