mruby-set: replace khash dependency with embedded kset implementation

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Replace the external khash dependency with a custom, memory-optimized
kset implementation that embeds directly into struct RSet. This change
significantly reduces memory consumption and eliminates the need for
khash.h inclusion.

Implemented by: Rovo Dev

Key improvements:
- Embedded kset_t directly in struct RSet (exactly 3 pointers in size)
- Combined memory layout: [keys...][flags...] in single allocation
- Eliminated pointer indirection for better cache performance
- Removed dependency on khash.h and related types (khint_t, khiter_t)
- Maintained full API compatibility with existing mruby-set interface
- Optimized for mrb_value keys with custom hash and equality functions

Technical details:
- kset_t structure: void *data, uint32_t n_buckets, uint32_t size
- Open addressing with linear probing for collision resolution
- 2-bit flags per bucket (empty/deleted) packed efficiently
- Power-of-2 bucket sizing with 75% load factor upper bound
- Integrated GC marking and memory management

Memory savings:
- Eliminates separate khash_t allocation and pointer storage
- Reduces struct RSet from 4 pointers to 3 pointers + embedded data
- More efficient memory layout with better locality of reference

All existing functionality preserved including set operations, iteration,
comparison methods, and Ruby-level API compatibility.

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This commit is contained in:

Yukihiro "Matz" Matsumoto

2025-06-25 10:53:42 +09:00

parent 88a7b782c6

commit a82911b35f

1 changed files with 576 additions and 277 deletions

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mrbgems/mruby-set/src/set.c

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