mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Yukihiro "Matz" Matsumoto
128 lines
3.0 KiB
Markdown
128 lines
3.0 KiB
Markdown
User visible changes in `mruby3`
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===
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# Build System
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## `build_config` directory
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Typical build configuration files are located in `build_config`
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directory. For examples:
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* `host-gprof`: compiles with `gprof` for performance tuning
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* `host-m32`: compiles in gcc 32bit mode on 64bit platforms
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* `boxing`: compiles all three boxing options
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* `clang-asan`: compiles with `clang`'s Address Sanitizer
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You can specify the build configration file with the
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`MRUBY_CONFIG` environment variable (or `CONFIG` in short).
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If the value specified by `MRUBY_CONFIG` is not the path to
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the configuration file, `build_config/${MRUBY_CONFIG}.rb` is
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used. So you can specify it as `rake MRUBY_CONFIG=boxing`,
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for example.
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# Build Configuration Contribution
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When you write a new build configuration description, please
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contribute. We welcome your contribution as a GitHub
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pull-request.
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# Language Changes
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## New Syntax
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We have ported some new syntax from CRuby.
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* Single line pattern matching (`12 => x`);
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mruby matches only with local variables at the moment
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* Numbered block parameter (`x.map{_1 * 2}`)
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* End-less `def` (`def double(x) = x*2`)
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# Configuration Options Changed
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Some configuration macro names are changed for consistency
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## `MRB_NO_FLOAT`
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Changed from `MRB_WITHOUT_FLOAT` to conform `USE_XXX` naming
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convention.
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## `MRB_USE_FLOAT32`
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Changed from `MRB_USE_FLOAT` to make sure `float` here means
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using single precision float, and not the opposite of
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`MRB_NO_FLOAT`.
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## `MRB_USE_METHOD_T_STRUCT`
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Changed from `MRB_METHOD_T_STRUCT`.
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To use `struct` version of `mrb_method_t`. More portable but consumes more memory.
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Turned on by default on 32bit platforms.
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## `MRB_NO_BOXING`
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Uses `struct` to represent `mrb_value`. Consumes more memory
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but easier to inveticate the internal and to debug. It used
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to be default `mrb_value` representation. Now the default is
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`MRB_WORD_BOXING`.
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## `MRB_WORD_BOXING`
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Pack `mrb_value` in an `intptr_t` integer. Consumes less
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memory compared to `MRB_NO_BOXING` especially on 32 bit
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platforms. `Fixnum` size is 31 bits so some integer values
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does not fit in `Fixnum` integers.
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## `MRB_NAN_BOXING`
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Pack `mrb_value` in a floating pointer number. Nothing
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changed from previous versions.
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## `MRB_USE_MALLOC_TRIM`
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Call `malloc_trim(0)` from mrb_full_gc() if this macro is defined.
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If you are using glibc malloc, this macro could reduce memory consumption.
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# Internal Changes
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## New Instructions
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`mruby3` introduces a few new instructions.
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Instructions that access pool[i]/syms[i] where i>255.
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* `OP_LOADL16`
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* `OP_STRING16`
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* `OP_LOADSYM16`
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Instructions that load a 32 bit integer.
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* `OP_LOADI32`
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Instruction that unwinds jump table for rescue/ensure.
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* `OP_JMPUW`
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Renamed from `OP_RAISE`
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* `OP_RAISEIF`
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## Removed Instructions
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Instructions for old exception handling
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* `OP_ONERR`
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* `OP_POPERR`
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* `OP_EPUSH`
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* `OP_EPOP`
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No more operand extention
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* `OP_EXT1`
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* `OP_EXT2`
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* `OP_EXT3`
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## `Random` now use `xoshiro128++`.
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For better and faster random number generation.
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