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mruby 3.2.0 released
2023-02-23 16:00:00 -0800
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mruby 3.2.0

We are announcing the first stable release of mruby 3.2 series - mruby 3.2.0.

Describes the new features and changes in mruby 3.2.
The main changes in mruby 3.2 are also described in doc/mruby3.2.md.

The language

  • Now a::B = c should evaluate a then c.
  • Anonymous arguments *, **, & can be passed for forwarding.
  • Multi-precision integer is available now via mruby-bigint gem.

mruby VM and bytecode

  • OP_ARYDUP was renamed to OP_ARYSPLAT. The instruction name was changed but instruction number and basic behavior have not changed (except that ARYDUP nil makes []).

Tools

mruby

  • -b only specifies the script is the binary. The files loaded by -r are not affected by the option.
  • mruby now loads complied binary if the suffix is .mrb.

mrbc

  • Add --no-optimize option to disable optimization.

mrbgems

mruby-class-ext

  • Add Class#subclasses method.
  • Add Module#undefined_instance_methods method.

New bundled gems

Breaking Changes

mrb_vm_run() may detach top-level local variables referenced from blocks

When the mrb_vm_run() function (including mrb_top_run()) is called, the previous top-level local variables referenced from blocks is detached under either of the following conditions.

  • If the stack_keep parameter is given as 0.
  • If the number of variables in irep to be executed is less than the number of previous top-level local variables.

This change also affects API functions such as mrb_load_string() and mrb_load_file(). The conditions under which the previous top-level local variables referenced from blocks is detached in these functions are as follows:

  • If the function has no mrbc_context pointer parameter, or the mrbc_context pointer parameter is set to NULL.
  • If the number of variables held in the mrbc_context pointer is less than the number of previous top-level local variables.

Intentional reliance on previous behavior may cause compatibility problems in your application.

CVEs

Following CVEs are fixed.

We have done 1,243 commits to 270 files with 19,130 additions and 10,192 deletions since mruby 3.1.0. For more detail of the updates, see Commit Log.

Thanks to all the contributors who have worked on bug fixes and improvements in the release of mruby 3.2.0.