Update version to 4.0.0RC3.

Bumps the pre-commit-hooks group with 1 update: [https://github.com/rhysd/actionlint](https://github.com/rhysd/actionlint).


Updates `https://github.com/rhysd/actionlint` from v1.7.11 to 1.7.12
- [Release notes](https://github.com/rhysd/actionlint/releases)
- [Changelog](https://github.com/rhysd/actionlint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rhysd/actionlint/compare/v1.7.11...v1.7.12)

---
updated-dependencies:
- dependency-name: https://github.com/rhysd/actionlint
  dependency-version: 1.7.12
  dependency-type: direct:production
  dependency-group: pre-commit-hooks
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/dependabot.yml

@@ -29,3 +29,5 @@ updates:
       pre-commit-hooks:
         patterns:
           - "*"
+    cooldown:
+      default-days: 7

.pre-commit-config.yaml

@@ -85,7 +85,7 @@ repos:
         args: [--whitespaces-count, "2"]
         exclude: Makefile$
   - repo: https://github.com/rhysd/actionlint
-    rev: v1.7.11
+    rev: v1.7.12
     hooks:
       - id: actionlint
         name: run actionlint

NEWS.md

@@ -23,8 +23,6 @@ mruby now supports pattern matching (case/in) syntax:
 - Trailing comma in method definition parameters: `def foo(a, b,)` ([f78334b](https://github.com/mruby/mruby/commit/f78334b))
 - Array/Hash/String subclasses can now override `[]` and `[]=` methods ([#6675](https://github.com/mruby/mruby/pull/6675))
 - `OP_SETIDX` optimization for Array and Hash ([ddd8fe1](https://github.com/mruby/mruby/commit/ddd8fe1))
-- `case`/`in` without `else` now raises `NoMatchingPatternError` ([d8de35b](https://github.com/mruby/mruby/commit/d8de35b))
-- Allow compound statement in parenthesized argument context ([919cbd8](https://github.com/mruby/mruby/commit/919cbd8))
 
 # Changes in C API
 
@@ -39,8 +37,6 @@ mruby now supports pattern matching (case/in) syntax:
 - `mrb_open()` returns mrb_state with exc set on init failure ([05ffe0c](https://github.com/mruby/mruby/commit/05ffe0c))
 - `mrb_utf8_to_buf()` for UTF-8 encoding consolidation ([7e28e68](https://github.com/mruby/mruby/commit/7e28e68))
 - `kh_is_end()` macro for safe khash iteration ([893cc75](https://github.com/mruby/mruby/commit/893cc75))
-- `mrb_bigint_p()` always defined regardless of bigint gem presence ([6c4a8c0](https://github.com/mruby/mruby/commit/6c4a8c0))
-- `RInteger` and `RFloat` added to `RVALUE` union ([13dbca0](https://github.com/mruby/mruby/commit/13dbca0))
 
 # ROM Method Tables
 
@@ -80,7 +76,6 @@ mruby-symbol-ext, mruby-range-ext, mruby-object-ext.
 - Emscripten: use native WASM exception handling ([ca364e3](https://github.com/mruby/mruby/commit/ca364e3))
 - HAL (Hardware Abstraction Layer) for platform abstraction in mruby-io, mruby-socket, mruby-dir, mruby-task ([74ca22f](https://github.com/mruby/mruby/commit/74ca22f))
 - `MRUBY_MIRB_READLINE` environment variable to control readline library selection ([0aafb83](https://github.com/mruby/mruby/commit/0aafb83))
-- MSYS2 drive letter support in build script ([77f6ffe](https://github.com/mruby/mruby/commit/77f6ffe))
 - Inter-gem headers separated from external API headers ([#6671](https://github.com/mruby/mruby/pull/6671))
 
 # Changes in mrbgems
@@ -115,7 +110,6 @@ mruby-symbol-ext, mruby-range-ext, mruby-object-ext.
 ## Other Gem Changes
 
 - **_NOTE_**: `Hash#deconstruct_keys` removed for CRuby compatibility ([34b9412](https://github.com/mruby/mruby/commit/34b9412))
-- **mruby-enum-lazy**: Fix `Lazy#flat_map` to handle non-enumerable block return values ([#6765](https://github.com/mruby/mruby/pull/6765))
 - **mruby-array-ext**: Add `Array#find` and `Array#rfind` methods
 - **mruby-io**: Add `IO#putc` and `Kernel#putc` ([baff6e6](https://github.com/mruby/mruby/commit/baff6e6))
 - **mruby-random**: Replace xoshiro with PCG for better memory efficiency ([f1bab01](https://github.com/mruby/mruby/commit/f1bab01))
@@ -131,8 +125,6 @@ mruby-symbol-ext, mruby-range-ext, mruby-object-ext.
 - Optimized masgn to generate literals directly into target registers ([fb5d966](https://github.com/mruby/mruby/commit/fb5d966))
 - Optimized splat of literal arrays in args/literals ([1cb8d73](https://github.com/mruby/mruby/commit/1cb8d73))
 - Early termination after too many parse errors ([510ebd7](https://github.com/mruby/mruby/commit/510ebd7))
-- Chunk array literals at 64 elements to reduce register pressure ([f98d641](https://github.com/mruby/mruby/commit/f98d641))
-- Chunk `%w()` and `%i()` literals to reduce register pressure ([62cf0dc](https://github.com/mruby/mruby/commit/62cf0dc))
 
 # VM Optimizations
 
@@ -193,10 +185,6 @@ Other optimizations:
 - [#6705](https://github.com/mruby/mruby/issues/6705) Can't get outer class of an object in C
 - [#6713](https://github.com/mruby/mruby/issues/6713) mruby-polarssl not work
 - [#6720](https://github.com/mruby/mruby/issues/6720) Random float range: different behavior from CRuby
-- [#6722](https://github.com/mruby/mruby/issues/6722) RBreak size overflow on 32-bit platforms with MRB_NO_BOXING
-- [#6740](https://github.com/mruby/mruby/issues/6740) `%w()`/`%i()` register pressure with large literals
-- [#6741](https://github.com/mruby/mruby/issues/6741) `case`/`in` without `else` should raise `NoMatchingPatternError`
-- [#6760](https://github.com/mruby/mruby/issues/6760) `mrb_gc_unregister()` not removing all matching entries
 
 # Merged Pull Requests
 
@@ -272,7 +260,6 @@ Other optimizations:
 - [#6589](https://github.com/mruby/mruby/pull/6589) Add pre-commit hook `check-zip-file-is-not-committed`
 - [#6591](https://github.com/mruby/mruby/pull/6591) mruby-eval fix license link in README
 - [#6593](https://github.com/mruby/mruby/pull/6593) README: Add Contributors Avatars, Star History, Table of Contents
-- [#6598](https://github.com/mruby/mruby/pull/6598) Fix heap buffer overflow in `#method_missing`
 - [#6599](https://github.com/mruby/mruby/pull/6599) pre-commit: run `markdown-link-check`, `oxipng`, `prettier` manually
 - [#6600](https://github.com/mruby/mruby/pull/6600) `dreamcast_shelf build config`: update to use KallistiOS wrappers
 - [#6601](https://github.com/mruby/mruby/pull/6601) fix: skip local build_config.rb when working in MRUBY_ROOT
@@ -316,30 +303,6 @@ Other optimizations:
 - [#6716](https://github.com/mruby/mruby/pull/6716) Fixes identity for proc object
 - [#6717](https://github.com/mruby/mruby/pull/6717) Fix mruby-task: wrapping by critical section and setting initial task receiver
 - [#6718](https://github.com/mruby/mruby/pull/6718) Add installation instructions for conda and Homebrew
-- [#6723](https://github.com/mruby/mruby/pull/6723) Add `RInteger` and `RFloat` to `RVALUE`
-- [#6727](https://github.com/mruby/mruby/pull/6727) Language documentation: update wording of "overloading" section
-- [#6729](https://github.com/mruby/mruby/pull/6729) Simplifying dependency addition for gensym task
-- [#6730](https://github.com/mruby/mruby/pull/6730) Simplifying presym file generation actions
-- [#6733](https://github.com/mruby/mruby/pull/6733) Include `mruby/presym.h` for all source files
-- [#6734](https://github.com/mruby/mruby/pull/6734) Chunk array literals at 64 elements to reduce register pressure
-- [#6735](https://github.com/mruby/mruby/pull/6735) Prevent full recompilation without changes to presym file
-- [#6739](https://github.com/mruby/mruby/pull/6739) Fix MSYS2 build error with drive letters
-- [#6743](https://github.com/mruby/mruby/pull/6743) Chunk `%w()` and `%i()` literals to reduce register pressure
-- [#6744](https://github.com/mruby/mruby/pull/6744) Raise `NoMatchingPatternError` in `case`/`in` without `else`
-- [#6747](https://github.com/mruby/mruby/pull/6747) Correctly handle empty hash as default named argument
-- [#6749](https://github.com/mruby/mruby/pull/6749) Fix microcontroller profile
-- [#6750](https://github.com/mruby/mruby/pull/6750) Fix out-of-bounds read and divide-by-zero in `Array#product`
-- [#6752](https://github.com/mruby/mruby/pull/6752) Fix `attr_reader`-generated methods accepting extra arguments
-- [#6753](https://github.com/mruby/mruby/pull/6753) Further optimize `Array#product`
-- [#6754](https://github.com/mruby/mruby/pull/6754) Mark `attr_reader` procs as noarg
-- [#6755](https://github.com/mruby/mruby/pull/6755) Reload `ci` after `mrb_hash_delete_key()` in keyword argument handling
-- [#6756](https://github.com/mruby/mruby/pull/6756) Avoid impact of object modifications caused by `mrb_vm_exec()` calls
-- [#6758](https://github.com/mruby/mruby/pull/6758) Don't assign result of `mrb_funcall()` directly to `regs`
-- [#6759](https://github.com/mruby/mruby/pull/6759) Define `mrb_bigint_p()` always
-- [#6761](https://github.com/mruby/mruby/pull/6761) Fix `mrb_gc_unregister()` to remove all matching entries
-- [#6762](https://github.com/mruby/mruby/pull/6762) Write generated test C files atomically to avoid build race condition
-- [#6765](https://github.com/mruby/mruby/pull/6765) Fix `Lazy#flat_map` to handle non-enumerable block return values
-- [#6767](https://github.com/mruby/mruby/pull/6767) Allow compound statement in parenthesized argument context
 
 # Security Fixes
 
@@ -357,6 +320,4 @@ Other optimizations:
 - Heap-use-after-free in insertion_sort ([099d2c47](https://github.com/mruby/mruby/commit/099d2c47))
 - Integer overflow in str_check_length ([6afff1c3](https://github.com/mruby/mruby/commit/6afff1c3))
 - Integer overflow in Integer#lcm ([070bef24](https://github.com/mruby/mruby/commit/070bef24))
-- Heap buffer overflow in `#method_missing` ([550d10a](https://github.com/mruby/mruby/commit/550d10a))
-- Out-of-bounds read and divide-by-zero in `Array#product` ([8441eaf](https://github.com/mruby/mruby/commit/8441eaf))
 - Multiple memory leak fixes in bigint, Set, Array, and Task gems

README.md

@@ -51,6 +51,8 @@ To get mruby, you can download the stable version 4.0.0 from the official mruby
 GitHub repository or clone the trunk of the mruby source tree with the "git
 clone" command. You can also install and compile mruby using [ruby-install](https://github.com/postmodern/ruby-install), [ruby-build](https://github.com/rbenv/ruby-build), [rvm](https://github.com/rvm/rvm), [conda](https://anaconda.org/channels/conda-forge/packages/mruby/overview) or [Homebrew](https://formulae.brew.sh/formula/mruby).
 
+The release candidate version 4.0.0 of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/archive/4.0.0-rc3.zip](https://github.com/mruby/mruby/archive/4.0.0-rc3.zip)
+
 The latest development version of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/zipball/master](https://github.com/mruby/mruby/zipball/master)
 
 The trunk of the mruby source tree can be checked out with the

include/mruby/version.h

@@ -57,7 +57,7 @@ MRB_BEGIN_DECL
 /*
  * Patch level string. (optional)
  */
-#define MRUBY_PATCHLEVEL_STR ""
+#define MRUBY_PATCHLEVEL_STR "RC3"
 
 #ifndef MRUBY_PATCHLEVEL_STR
 # if MRUBY_PATCHLEVEL < 0
@@ -80,7 +80,7 @@ MRB_BEGIN_DECL
 /*
  * Release year.
  */
-#define MRUBY_RELEASE_YEAR 2025
+#define MRUBY_RELEASE_YEAR 2026
 
 /*
  * Release month.
@@ -90,7 +90,7 @@ MRB_BEGIN_DECL
 /*
  * Release day.
  */
-#define MRUBY_RELEASE_DAY 20
+#define MRUBY_RELEASE_DAY 2
 
 /*
  * Release date as a string.

mrbgems/mruby-socket/mrblib/socket.rb

@@ -701,13 +701,11 @@ class UDPSocket < IPSocket
   #   data, addr = sock.recvfrom_nonblock(1024)
   #
   def recvfrom_nonblock(*args)
-    s = self
     begin
       self._setnonblock(true)
       self.recvfrom(*args)
     ensure
-      # XXX: self is a SystemcallException here! (should be bug)
-      s._setnonblock(false)
+      self._setnonblock(false)
     end
   end
 

src/vm.c

@@ -134,19 +134,29 @@ static inline void
 envadjust(mrb_state *mrb, mrb_value *oldbase, mrb_value *newbase)
 {
   mrb_callinfo *ci = mrb->c->cibase;
-  ptrdiff_t delta = newbase - oldbase;
+  /*
+   * Byte-level calculation to avoid truncation when allocator alignment is
+   * smaller than sizeof(mrb_value).
+   * eg: MRB_NO_BOXING + MRB_INT64 with MRB_32BIT => sizeof(mrb_value)=16
+   *     And when memory allocator's alignment is 8 bytes
+   * Pointer subtraction on mrb_value* would truncate (8/16 -> 0).
+   * So, we use char* for pointer calculation to get the correct offset in bytes,
+   * then apply that offset to mrb_value* pointers.
+   */
+  ptrdiff_t off = (char *)newbase - (char *)oldbase;
 
-  if (delta == 0) return;
+  if (off == 0) return;
   while (ci <= mrb->c->ci) {
     struct REnv *e = mrb_vm_ci_env(ci);
 
+    mrb_value *new_stack = (mrb_value *)((char *)ci->stack + off);
+
     if (e) {
       mrb_assert(e->cxt == mrb->c && MRB_ENV_ONSTACK_P(e));
       mrb_assert(e->stack == ci->stack);
-
-      e->stack += delta;
+      e->stack = new_stack;
     }
-    ci->stack += delta;
+    ci->stack = new_stack;
     ci++;
   }
 }