When you try to start an event loop inside an event loop,
the mruby process will SIGSEGV:
```ruby
Task.new { Task.run }
Task.run
```
This change turns the second call to `Task.run` into a noop
that returns nil instead.
Fix#6865
The function is the symmetric counterpart of mrb_method_cache_clear
declared two lines above, but was added without MRB_API in
50bc8c6136. Both are VM-internal cache invalidators exposed in the
public header under the same #ifndef MRB_NO_*_CACHE pattern; make
their decoration consistent.
Reported by dearblue in #6826.
Co-authored-by: Claude <noreply@anthropic.com>
These public convenience wrappers were declared with raw
`static inline`, while every other public inline helper in mruby.h
uses MRB_INLINE. MRB_INLINE expands to static inline, so this is a
spelling-only change for grep-consistency across the C API.
Reported by dearblue in #6827.
Co-authored-by: Claude <noreply@anthropic.com>
When mrbc compiles multiple input files (e.g. `mrbc -g -o out.mrb
a.rb b.rb`), the bison parser's one-token lookahead can buffer the
final token of one file before partial_hook switches to the next.
By the time bison reduces that token into an AST node,
`mrb_parser_set_filename` has already reset `p->lineno` to 0, so
init_var_header recorded lineno=0 for the previous file's last
statement and codegen propagated the previous instruction's line.
Save the lineno into `prev_file_lineno` immediately before the
reset so init_var_header can restore the correct value when it
detects the lookahead edge case (lineno==0 && filename_index>0).
close#1316
Co-authored-by: Claude <noreply@anthropic.com>
mrb_funcall_id() always reserves a 16-element argv buffer on its
stack frame regardless of the actual argument count. The two new
static inline wrappers allocate exactly one or two argument slots,
saving 100-220 bytes of stack per call after inlining (the savings
depend on mrb_value size under the active boxing configuration).
close#5804
Co-authored-by: Claude <noreply@anthropic.com>
Adds two API helpers that mirror CRuby's RSTRING_GETMEM idiom:
- ARY_GETMEM(a, ptr, len): inside-mruby helper that takes a
struct RArray* and assigns ptr/len from the embed or heap form.
- RARRAY_GETMEM(a, ptr, len): public wrapper on an mrb_value.
Both expand to a single ARY_EMBED_P check, with a uniqued local so
the array argument is evaluated only once (callers can safely pass
expressions with side effects).
Also type the ARY_NO_EMBED stub of ARY_EMBED_PTR as
((mrb_value*)NULL) instead of integer 0, so it composes cleanly in
pointer expressions like the new ARY_GETMEM.
The build-error issue this originated from (compilation with
MRB_ARY_NO_EMBED) was already fixed differently in master via
#ifndef guards (commit 78658d67e). These additions stand on their
own as new API for downstream gems.
Closes#6712, picked from PR by dearblue.
Co-authored-by: Claude <noreply@anthropic.com>
On 32-bit platforms whose ABI gives 8-byte members 8-byte alignment
(xtensa, ARM, MIPS, PowerPC, ...), MRB_NAN_BOXING failed to build with
"RVALUE size must be within 5 words" because two structs got padded
past the budget:
- struct RBreak: had an existing MRB_USE_RBREAK_VALUE_UNION workaround
that stores the value as uint32_t[] to avoid forcing 8-byte alignment
on the struct, but the gate only enabled it for MRB_NO_BOXING.
Extend to NAN_BOXING + 32-bit, with a NAN_BOXING-specific get/set
(no separate tt to stash since nan-boxing encodes type in the bits).
- struct RArray: MRB_ARY_NO_EMBED was similarly gated to NO_BOXING;
embedded mrb_value[] forces 8-byte alignment of the inner union and
pads the heap-form layout. Extend the gate to NAN_BOXING + 32-bit.
Both gates now name the structural property (32-bit + mrb_value has an
8-byte aligned member) rather than enumerating boxing modes, so adding
new boxing modes won't silently miss this class of bug again.
i386's System V ABI gives uint64_t only 4-byte alignment, hiding the
problem on x86 -m32; -malign-double simulates the strict-alignment ABI
that exhibits the failure, and is what was used to verify the fix.
Closes#6815, reported by dearblue.
Co-authored-by: Claude <noreply@anthropic.com>
The mruby C style places `else` on its own line. Reformat the
remaining `} else {` / `} else if (...)` occurrences.
Co-authored-by: Claude <noreply@anthropic.com>
split mrb_obj_alloc() into type-validation wrapper and allocation
core (mrb_obj_alloc_core). internal callers (mrb_proc_new,
mrb_env_new) use the core directly, skipping 15+ lines of type
validation per allocation.
most impactful for workloads with heavy Proc/Env allocation
(lambda calculus, block-intensive code).
Co-authored-by: Claude <noreply@anthropic.com>
track dynamic (runtime-created) symbols separately from presyms,
inline symbols, and static C API symbols. raise RuntimeError when
the dynamic symbol count exceeds MRB_SYMBOL_MAX (default 4096).
this prevents DoS attacks via unbounded symbol creation (e.g.
"str".to_sym in a loop). presyms and inline symbols are not
counted toward the limit.
infrastructure for future symbol GC: sym_flags array tracks
per-symbol metadata (SYM_FL_DYNAMIC flag).
Co-authored-by: Claude <noreply@anthropic.com>
Replace the threshold-based GC trigger (gc->threshold vs gc->live)
with a debt model (gc->gc_debt). Each allocation increments debt;
each GC step decrements by GC_STEP_SIZE. When a cycle completes,
credit is proportional to live_after_mark * interval_ratio, giving
a natural feedback loop that adapts to allocation rate.
Co-authored-by: Claude <noreply@anthropic.com>
GC.step_limit caps the per-step work in incremental GC,
enabling more predictable pause times for real-time use.
GC.malloc_threshold triggers GC based on allocation bytes,
addressing memory pressure from large buffers.
Both default to 0 (disabled), preserving existing behavior.
Co-authored-by: Claude <noreply@anthropic.com>
Add gc_total_count, minor_gc_count, major_gc_count (uint32_t) to
mrb_gc, guarded by MRB_GC_STATS. Zero cost when disabled.
Co-authored-by: Claude <noreply@anthropic.com>
Remove the per-entry generation field and per-state generation
counter. Invalidation now clears entries directly, removing one
comparison from every OP_GETCONST hot path.
Co-authored-by: Claude <noreply@anthropic.com>
Cache OP_GETCONST results in a global direct-mapped cache (64 entries)
keyed by (irep, sym). Invalidate all entries via a generation counter
bumped on mrb_const_set(), mrb_const_remove(), and
mrb_define_const_id(). ~10% faster on constant-heavy code; disabled
with MRB_NO_CONST_CACHE.
Co-authored-by: Claude <noreply@anthropic.com>
Older C++ compilers (notably gcc 4.x) do not support C99 struct field
designators (.func = ...) even as an extension, which blocks building
mruby when it is included from a C++ translation unit under such
toolchains.
Reorder union mrb_mt_ptr so that mrb_func_t is the first member, and
switch MRB_MT_ENTRY to positional aggregate initialization. Both are
compatible with pre-C99 / pre-C++20 compilers.
Fixes#6789
Co-authored-by: Claude <noreply@anthropic.com>
Compress the 24-bit aspec into 13 free flag bits on RProc (bits 0-6
and 14-19) when wrapping cfunc methods. Field widths: req/opt 3 bits
(max 7), post/key 2 bits (max 3), rest/kdict/block 1 bit each. Values
exceeding the compressed range are clamped and rest is forced to 1.
This enables Proc#arity and Proc#parameters to return correct results
for cfunc-backed Procs (e.g. from Method#to_proc) with zero memory
overhead -- no struct change needed.
Closes#6764
Commit 250bf6edd renamed KHASH_DEFAULT_SIZE to KHASH_INITIAL_SIZE but
missed updating build_config files and documentation. Also restore the
default value in khash.h to 32, consistent with the documented default
and the profile hierarchy (MRB_CONSTRAINED_BASELINE_PROFILE reduces it
to 16).
Since presym is now mandatory, mruby.h includes presym.h so that
MRB_SYM() macros are available everywhere without explicit include.
Remove redundant #include <mruby/presym.h> from all source files.
Co-authored-by: Claude <noreply@anthropic.com>
update MRUBY_RUBY_VERSION to "4.0", MRUBY_RELEASE_MAJOR to 4,
MRUBY_RELEASE_MINOR to 0. update README.md references accordingly.
Co-authored-by: Claude <noreply@anthropic.com>
On 32-bit platforms where alignof(int64_t) == 8 (ARM, MIPS, PowerPC,
RISC-V, MinGW), struct RBreak with MRB_USE_RBREAK_VALUE_UNION was 24
bytes (6 words) due to alignment padding before the union
mrb_value_union field. This exceeds the 5-word RVALUE limit, causing
a static assertion failure.
Replace union mrb_value_union with uint32_t[] storage (alignof == 4)
and use memcpy for value access. This gives exactly 20 bytes on all
32-bit platforms. Ref #6722
Co-authored-by: Claude <noreply@anthropic.com>
MRB_FL_OBJ_SHAPED uses bit 5 of flags, which on 32-bit conflicts
with Hash's ea_n_used field (bits 5-9). A Hash with entries would
falsely match MRB_OBJ_SHAPED_P, causing SEGV when its iv pointer
was misinterpreted as mrb_shaped_iv. Add tt == MRB_TT_OBJECT check
to the predicate.
Co-authored-by: Claude <noreply@anthropic.com>
The old name referred to "truncation" of float precision, which no
longer happens with rotation encoding. The new name describes the
actual behavior: disabling inline float encoding in word boxing.
The old name is kept as an obsolete alias for backward compatibility.
Co-authored-by: Claude <noreply@anthropic.com>
On 32-bit with MRB_WORDBOX_NO_FLOAT_TRUNCATE, RFloat stores a double
(8-byte alignment) but GC heap slots only guarantee 4-byte alignment.
Use char array + memcpy accessors to avoid misaligned access (SIGBUS
on MIPS, undefined behavior per C standard).
Co-authored-by: Claude <noreply@anthropic.com>
Heap-allocated RInteger with int64_t requires 8-byte alignment,
but GC heap slots on 32-bit may not guarantee it, causing SIGBUS
on architectures like MIPS. MRB_NO_BOXING is still allowed since
integers are stored inline in mrb_value (no heap RInteger).
Co-authored-by: Claude <noreply@anthropic.com>
Introduce "object shapes" (hidden classes) that share IV key
layouts across objects with the same instance variable assignment
order. This eliminates per-object key storage overhead.
Memory savings: ~22% heap reduction for object-heavy workloads
(e.g., 150k objects with 2-6 IVs). Per-object: 40->24 bytes
for 2 IVs. Objects exceeding 16 IVs or using
remove_instance_variable fall back to traditional iv_tbl.
Co-authored-by: Claude <noreply@anthropic.com>
Allow users to provide contiguous memory buffers for GC heap pages
via mrb_gc_add_region(). Region pages are carved from user-owned
buffers and never freed by the GC. This is the foundation for
bitmap GC on embedded targets with fragmented RAM.
Co-authored-by: Claude <noreply@anthropic.com>
Pack pool/syms/reps arrays into a single calloc with the irep struct,
reducing 4 allocations per irep to 1. Arrays are ordered by descending
alignment (pool/reps/syms) to eliminate inter-array padding.
Co-authored-by: Claude <noreply@anthropic.com>
- array.h: disable embedded arrays when MRB_INT64 makes mrb_value
too large to embed (fixes MRB_ARY_EMBED_LEN_MAX assertion)
- error.h: enable MRB_USE_RBREAK_VALUE_UNION for all 32-bit
no-boxing builds (MRB_USE_FLOAT32 is irrelevant without
word/nan boxing)
- gc.c: restrict RVALUE 8-byte alignment padding to
MRB_WORD_BOXING builds (fixes RVALUE size assertion)
- vm.c: guard direct ary->as.ary access with MRB_ARY_NO_EMBED
Fixes#6722.
Co-authored-by: Claude <noreply@anthropic.com>
replace lossy 2-bit truncation with rotation-based encoding for
32-bit + MRB_USE_FLOAT32, matching the technique used for 64-bit
float64. rotl32(bits - ADDEND, 3) maps biased exponents [95, 158]
(actual [-32, +31]) to properly tagged inline values with zero
precision loss. special values (0, Inf, NaN) use sentinel constants;
out-of-range floats fall back to heap-allocated RFloat.
also fix a pre-existing alignment issue: RVALUE was 20 bytes on
32-bit, causing 4-byte-aligned objects to be misidentified as
immediates by word boxing (WORDBOX_IMMEDIATE_MASK=0x07 requires
8-byte alignment). pad RVALUE to 24 bytes on 32-bit + float32.
Co-authored-by: Claude <noreply@anthropic.com>
ROM method tables used static mrb_mt_tbl variables shared
across the process. The next pointer in each wrapper was
mutated by mrb_mt_init_rom(), causing cross-state
contamination when multiple mrb_state instances existed.
Allocate mrb_mt_tbl wrappers per-state via mrb_malloc().
The const mrb_mt_entry[] arrays remain static and shared.
Wrappers are tracked in mrb->rom_mt and freed at mrb_close().
Remove MRB_MT_ROM_TAB macro; add MRB_MT_INIT_ROM macro that
auto-computes size and calls the new mrb_mt_init_rom().
Co-authored-by: Claude <noreply@anthropic.com>
The ROM table types (mrb_mt_entry, mrb_mt_tbl) and macros
(MRB_MT_ENTRY, MRB_MT_ROM_TAB, etc.) are used by 34 files
across core and gems -- they are part of the public method
registration API, not internal implementation details.
Move them to class.h where the rest of the method table API
lives, eliminating the #ifdef MRUBY_CLASS_H guard that was
needed in internal.h.
Co-authored-by: Claude <noreply@anthropic.com>
Replace check_method_noarg() with check_argument_count() that validates
min <= argc <= max using the full aspec stored in mrb_method_t.flags.
This catches ArgumentError earlier at dispatch time, before entering
the C function.
The old check only handled the special case of aspec==0 (NOARG).
The new check extracts REQ, OPT, REST, POST, KEY, and KDICT from
the aspec and validates accordingly. Keyword hash is counted as
a positional arg only when the method doesn't accept keywords.
Remove MRB_METHOD_NOARG_P macro from proc.h (subsumed by aspec check).
Fix 15 incorrect aspec declarations across the codebase that were
exposed by the stricter enforcement.
Co-authored-by: Claude <noreply@anthropic.com>
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