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ref: https://docs.ruby-lang.org/ja/3.0.0/method/Random/i/bytes.html
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`mrb_static_assert()` extends the macro function to take one or two arguments.
If the argument is other than that, an error will occur.
References:
- static_assert のメッセージ省略を許可 - cpprefjp C++日本語リファレンス
https://cpprefjp.github.io/lang/cpp17/extending_static_assert.html
- c - Overloading Macro on Number of Arguments - Stack Overflow
https://stackoverflow.com/a/11763277
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This is to avoid the approximation of `Random#rand` when `seed`s are close together.
For example, the first `#rand` values after doing `Random#srand(0)` and `Random#srand(1)` are very similar.
Below is the sequence of mruby before this patch was given a `seed` of `0...20`:
```console
% bin/mruby -e 'r = Random.new; 20.times { |i| r.srand(i); puts "seed=%2d %s" % [i, 10.times.map { "%0.3f" % r.rand }.join(" ")] }'
seed= 0 0.643 0.585 0.198 0.732 0.087 0.605 0.548 0.468 0.573 0.966
seed= 1 0.643 0.585 0.198 0.607 0.370 0.605 0.633 0.593 0.395 0.439
seed= 2 0.643 0.585 0.197 0.981 0.652 0.730 0.875 0.713 0.529 0.269
seed= 3 0.643 0.585 0.198 0.857 0.934 0.730 0.960 0.216 0.286 0.523
seed= 4 0.643 0.585 0.197 0.231 0.217 0.605 0.959 0.958 0.478 0.482
seed= 5 0.643 0.585 0.197 0.106 0.249 0.605 0.044 0.330 0.925 0.047
seed= 6 0.643 0.585 0.197 0.481 0.781 0.731 0.285 0.960 0.804 0.725
seed= 7 0.643 0.585 0.197 0.356 0.813 0.731 0.370 0.711 0.937 0.448
seed= 8 0.643 0.585 0.198 0.732 0.329 0.108 0.243 0.974 0.766 0.936
seed= 9 0.643 0.585 0.198 0.607 0.611 0.108 0.827 0.102 0.962 0.597
seed=10 0.643 0.585 0.198 0.981 0.393 0.233 0.569 0.723 0.472 0.805
seed=11 0.643 0.585 0.198 0.857 0.676 0.233 0.154 0.222 0.603 0.371
seed=12 0.643 0.585 0.198 0.231 0.458 0.108 0.654 0.979 0.928 0.577
seed=13 0.643 0.585 0.198 0.106 0.490 0.108 0.239 0.355 0.749 0.831
seed=14 0.643 0.585 0.198 0.481 0.523 0.233 0.981 0.486 0.505 0.131
seed=15 0.643 0.585 0.198 0.356 0.555 0.234 0.565 0.233 0.011 0.666
seed=16 0.643 0.585 0.197 0.730 0.573 0.611 0.904 0.512 0.971 0.153
seed=17 0.643 0.585 0.197 0.605 0.855 0.611 0.240 0.636 0.041 0.509
seed=18 0.643 0.585 0.196 0.979 0.137 0.736 0.229 0.765 0.674 0.832
seed=19 0.643 0.585 0.197 0.855 0.420 0.736 0.566 0.268 0.183 0.219
```
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- stdlib.h
- stddef.h
- stdint.h
- stdarg.h
- limits.h
- float.h
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- `Random.rand` with `MRB_NO_FLOAT` behaves as `Random.rand(100)`
- `Random.rand(i)` where `i<0` raises `ArgumentError`
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`MRB_INT_MIN` does not have a corresponding positive value.
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This reverts commit dc51d89ac22acc60b9bfeed87115863565b74085.
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Instead of including `mruby/presym.h` everywhere, we provided the
fallback `mruby/presym.inc` under `include/mruby` directory, and specify
`-I<build-dir>/include` before `-I<top-dir>/include` in `presym.rake`.
So even when someone drops `-I<build-dir>/include` in compiler options,
it just compiles without failure.
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Addressed an issue where existing programs linking `libmruby.a` could only
be built by adding `<build-dir>/include` to compiler's include path.
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Where fixnum overflow can happen.
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`sizeof(rand_state)` had been bigger than `sizeof(void*)*3`. Changed
random number generator to `Xorshift96` on 32 bit platforms.
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- Integrate `Fixnum` and `Integer`
- Remove `Integral`
- `int / int -> int`
- Replace `mrb_fixnum()` to `mrb_int()`
- Replace `mrb_fixnum_value()` to `mrb_int_value()`.
- Use `mrb_integer_p()` instead of `mrb_fixnum_p()`
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- `MRB_WITHOUT_FLOAT` => `MRB_NO_FLOAT`
- `MRB_USE_FLOAT` => `MRB_USE_FLOAT32`
The former is to use `USE_XXX` naming convention. The latter is to make
sure `float` is 32bit float and not floating point number in general.
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For efficiency with `MRB_WORD_BOXING` (implement type predicate macros for
all `enum mrb_vtype`).
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Array index became potentially negative because `uint32_t` is cast to
`mrb_int`.
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When the size of Xorshift128 seed (`sizeof(uint32)*4`) is bigger than
ISTRUCT_DATA_SIZE, `Random` uses Xorshift96 instead.
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Now `rand` can be used with `MRB_WITHOUT_FLOAT`; ref #4576
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The purpose is to clarify the error if there is a needed/conflicts
configuration at compile time.
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The ISO standard does not include implicit type conversion using
`to_int`. This implicit conversion often causes vulnerability.
There will be no more attacks like #4120.
In addition, we have added internal convenience method `__to_int` which
does type check and conversion (from floats).
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It reduces the memory consumption and sometimes improve the
performance as well. For example, the consumed memory size
of `bench/bm_ao_render.rb` is reduced from 1.2GB to 1GB, and
its total execution time become 18.795 sec from 22.229 sec.
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despite the fact original authors agreed to distribute their work
under MIT license, it does not mean mt19937ar.[ch] became the work
of mruby developers. To clarify, we updated copyright and license
notice of the source files.
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if you see compiler errors due to this commit, you'd better to use array-modifying
functions, e.g. mrb_ary_set() or mrb_ary_push(), otherwise you might see nasty
GC bugs in the future. if you are sure what you are doing, replace `RARRAY_PTR(ary)`
by `mrb_ary_ptr(ary)->ptr`. but be warned.
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