Replace the parallel-arrays (struct-of-arrays) ROM method table
layout with an array-of-structs layout where each mrb_mt_entry
bundles its function pointer and symbol key together.
New MRB_MT_ENTRY() and MRB_MT_ROM_TAB() macros simplify ROM table
definitions from a 3-part pattern (SIZE define + anonymous struct +
mrb_mt_tbl) to a 2-part pattern (entries array + mrb_mt_tbl).
Internal mt_* functions in class.c are simplified: single memmove/
memcpy operations replace paired key+value operations.
Co-authored-by: Claude <noreply@anthropic.com>
Previously, removing a ROM method required flattening all chain layers
into a single mutable table. This was O(n) and allocated RAM for all
previously-ROM methods.
Use a tombstone marker (MT_FUNC flag with func=NULL) instead. The
mt_get() lookup treats this as "not found" and stops the chain walk,
hiding the ROM entry while allowing superclass lookup.
Co-authored-by: Claude <noreply@anthropic.com>
The _2 suffix variants accept an mrb_state* parameter that is
always ignored with presym enabled. Replace all uses in codegen.c,
parse.y, and y.tab.c with the standard macros. The _2 macro
definitions are kept in presym headers for backward compatibility.
Co-authored-by: Claude <noreply@anthropic.com>
Change default stack growth from linear (+128) to exponential (1.5x).
This reduces reallocation frequency while maintaining reasonable memory
usage. The minimum growth is still MRB_STACK_GROWTH (128) to ensure
small programs don't over-allocate.
MRB_STACK_EXTEND_DOUBLING (2x growth) remains available for maximum
performance when memory is not a concern.
Co-authored-by: Claude <noreply@anthropic.com>
Gems like mruby-task add preprocessor defines (MRB_USE_TASK_SCHEDULER)
that affect mrb_state structure. The amalgamation generator now detects
these defines from the build configuration and adds them at the top of
mruby.h before struct definitions are encountered.
Supported define patterns: MRB_USE_*, MRB_UTF8_*, HAVE_MRUBY_*
Co-authored-by: Claude <noreply@anthropic.com>
Add notes section explaining the optimization behavior:
- Which functions are used for direct access
- When fallback to method dispatch occurs
- Why subclasses can override []/[]=
Co-authored-by: Claude <noreply@anthropic.com>
add pattern matching section to limitations.md clarifying that only
rightward assignment (expr => var) is currently supported, while
case/in syntax and other pattern types are not yet implemented.
Co-authored-by: Claude <noreply@anthropic.com>
The issue resolved by the preceding patch was solely the C++ exception task within the mruby core.
This patch aims to resolve a similar sequencing issue that also exists in GEMS.
In practice, `mruby-compiler` is sometimes loaded via dependencies rather than being explicitly specified in the build configuration file.
In such cases, when `mruby-compiler/mrbgem.rake` is loaded, it is not yet determined whether C++ exceptions will be used. Consequently, even if it later becomes clear that `core/codegen-cxx.cxx` and `core/y.tab-cxx.cxx` are required, the system could not handle this.
To resolve this issue, we introduce the `MRuby::Gem::Specification#build_settings` method as a mechanism for lazily evaluating build setup.
However, for backward compatibility, the commands are cloned twice in `gem.setup` and `gem.setup_build`.
This is because many existing GEMS configure commands directly within the setup block.
ref. https://github.com/mruby/mruby/issues/6615
OP_LOADI stores an 8 bit integer to a register, so we renamed the
instruction name to describe the behavior more precisely, like
OP_LOADI16 and OP_LOADI32.
The documentation table is generated by the `rake doc:update-index` command.
The following conditions must be met for links to be added to the documentation table.
- The file must be placed under the `doc/` directory
- The file must have the extension `.md`
- The file must be written at the top of the file with `<! -- summary: ANY-TEXT -->`
Introduce the `MRuby::Build#install_excludes` attribute.
This attribute is an array to which you add strings, regular expressions, and proc objects that will serve as filters to exclude.
This feature was inspired by @hoshiumiarata's comment.
https://github.com/mruby/mruby/issues/6352#issuecomment-2426721517
- Added the index number corresponding to the instruction code.
- Omitted trailing `|` from table elements.
The table elements in GitHub Flavored Markdown can't wrap wherever wanted.
And trying to align the end of it tends to make the whole thing longer.
The purpose is to remove the `mid` field from the `mrb_cache_entry` structure.
The resulting RAM requirement for the method cache is reduced from 5 words per entry to 4 words per entry for 32-bit CPUs.
The relevant changes are as follows:
- Removed `MRB_USE_METHOD_T_STRUCT`.
The `mrb_method_t` type is now always defined as a structure.
- Include method IDs in `mrb_method_t`
Change the `flags` member to `uint32_t`.
The bitstring structure should be the same as the keys of the `mt` table in `class.c`.
I believe the impact on API compatibility with previous versions is minimal.
Yukihiro "Matz" Matsumoto