When mrb_mt_init_rom() is called on a class that already has a
mutable method table (from prior mrb_define_method_id() calls),
the mutable top layer is now frozen in place instead of being
left as a writable layer that wastes RAM on embedded systems.
The frozen bit (bit 29 of alloc field) marks heap-allocated
method table layers as temporarily immutable. Unlike the
readonly bit (bit 30, for true ROM), frozen layers are
automatically unfrozen when methods are later added via
mrb_define_method_raw() or removed via mrb_remove_method().
This preserves the c->mt pointer, which is critical because
iclasses (from module inclusion) hold a copy of it.
Co-authored-by: Claude <noreply@anthropic.com>
int_divmod passed an integer mrb_value directly to flo_divmod, which
used mrb_float() to extract the value. In word boxing mode, this caused
a misaligned pointer dereference. Use mrb_ensure_float_type() to safely
convert the integer to float before passing to flo_divmod.
Co-authored-by: Claude <noreply@anthropic.com>
`&nil` is recently introduced in CRuby to explicitly declare that
a method does not accept a block. When a block is passed,
ArgumentError "no block accepted" is raised. This is analogous to
`**nil` for keyword arguments.
The noblock flag is encoded in bit 23 of OP_ENTER's aspec operand
(24=n1:m5:o5:r1:m5:k5:d1:b1), avoiding the need for a new opcode.
Co-authored-by: Claude <noreply@anthropic.com>
Left-shifting a negative int64_t is undefined behavior in C.
Cast to uint64_t before the shift to produce the same bit pattern
using well-defined unsigned arithmetic.
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>
Since disable.h was removed, enable.h was the only remaining
dispatch target from presym.h. Inline its contents into presym.h
and delete the now-redundant enable.h. Also define _2 backward
compatibility macros in terms of the standard macros.
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>
Since presym is now always enabled, the @enable_presym flag,
presym_enabled? method, and all conditional branches guarding
presym-specific code paths are dead code. Remove them and
simplify the affected build logic.
Co-authored-by: Claude <noreply@anthropic.com>
Presym is now always enabled. Remove #ifndef MRB_NO_PRESYM
guards and their #else fallback branches from all core files.
Co-authored-by: Claude <noreply@anthropic.com>
Remove disable_presym from mrbc_build and cross-build fallback.
Add explicit object file dependencies on presym headers in
presym.rake to prevent compilation before headers are generated.
Co-authored-by: Claude <noreply@anthropic.com>
Move String's 46 method definitions from runtime
mrb_define_method_id() calls to a static ROM method table
sorted at init time. mrb_mt_init_rom() sorts the parallel
vals/keys arrays by presym ID and sets the readonly flag.
Expose mt_tbl and related types in internal.h so ROM tables
can be defined in individual source files.
When MRB_NO_PRESYM is defined, falls back to traditional
runtime method registration.
Co-authored-by: Claude <noreply@anthropic.com>
Add next pointer and readonly flag to mt_tbl struct to support
chained ROM method table layers. mt_get() walks the chain,
mt_copy() shares ROM layers, mt_free() and mrb_gc_mark_mt() skip
readonly layers. COW in mrb_define_method_raw() creates a mutable
top layer when the existing table is readonly. mt_flatten() merges
all layers for the rare remove_method case.
No ROM tables exist yet -- all tables have next==NULL and no
readonly flag, so behavior is identical to the previous code.
Co-authored-by: Claude <noreply@anthropic.com>
Yukihiro "Matz" Matsumoto