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2025-12-23Move special const check to gc.c for rb_gc_impl_object_moved_pPeter Zhu
2025-12-20Check slot_size before zeroing memory for GC hookPeter Zhu
If the slot_size < RVALUE_SIZE then we would underflow in the memset.
2025-12-17[DOC] Small changes to docs for ObjectSpace#each_object (#15564)Luke Gruber
Change example to use user-defined class instead of `Numeric`.
2025-12-17Rename to `struct rbimpl_size_overflow_tag`Nobuyoshi Nakada
This struct is used for addition not only for multiplication, so remove the word `mul`, and make the member names more descriptive.
2025-12-11Add assumption to free_vm_weak_referencesJohn Hawthorn
Help the compiler know that we always get a heap object here.
2025-12-10Add `NUM2PTR` and `PTR2NUM` macrosNobuyoshi Nakada
These macros have been defined here and there, so collect them.
2025-12-09Fix typos in gc.c and gc.rbhi
2025-12-07Output ivar length for T_OBJECT in obj_infoPeter Zhu
2025-12-06Fix id2ref for multi-RactorPeter Zhu
The id2ref table needs to be under a VM lock to ensure there are no race conditions. The following script crashes: o = Object.new ObjectSpace._id2ref(o.object_id) 10.times.map do Ractor.new do 10_000.times do a = Object.new a.object_id end end end.map(&:value) With: [BUG] Object ID seen, but not in _id2ref table: object_id=2800 object=T_OBJECT ruby 4.0.0dev (2025-12-06T15:15:43Z ractor-id2ref-fix e7f9abdc91) +PRISM [x86_64-linux] -- Control frame information ----------------------------------------------- c:0001 p:---- s:0003 e:000002 l:y b:---- DUMMY [FINISH] -- Threading information --------------------------------------------------- Total ractor count: 5 Ruby thread count for this ractor: 1 -- C level backtrace information ------------------------------------------- miniruby(rb_print_backtrace+0x14) [0x6047d09b2dff] vm_dump.c:1105 miniruby(rb_vm_bugreport) vm_dump.c:1450 miniruby(rb_bug_without_die_internal+0x5f) [0x6047d066bf57] error.c:1098 miniruby(rb_bug) error.c:1116 miniruby(rb_gc_get_ractor_newobj_cache+0x0) [0x6047d066c8dd] gc.c:2052 miniruby(gc_sweep_plane+0xad) [0x6047d079276d] gc/default/default.c:3513 miniruby(gc_sweep_page) gc/default/default.c:3605 miniruby(gc_sweep_step) gc/default/default.c:3886 miniruby(gc_sweep+0x1ba) [0x6047d0794cfa] gc/default/default.c:4154 miniruby(gc_start+0xbf2) [0x6047d0796742] gc/default/default.c:6519 miniruby(heap_prepare+0xcc) [0x6047d079748c] gc/default/default.c:2090 miniruby(heap_next_free_page) gc/default/default.c:2305 miniruby(newobj_cache_miss) gc/default/default.c:2412 miniruby(newobj_alloc+0xd) [0x6047d0798ff5] gc/default/default.c:2436 miniruby(rb_gc_impl_new_obj) gc/default/default.c:2515 miniruby(newobj_of) gc.c:996 miniruby(rb_wb_protected_newobj_of) gc.c:1046 miniruby(str_alloc_embed+0x28) [0x6047d08fda18] string.c:1019 miniruby(str_enc_new) string.c:1069 miniruby(prep_io+0x5) [0x6047d07cda14] io.c:9305 miniruby(prep_stdio) io.c:9347 miniruby(rb_io_prep_stdin) io.c:9365 miniruby(thread_start_func_2+0x77c) [0x6047d093a55c] thread.c:679 miniruby(thread_sched_lock_+0x0) [0x6047d093aacd] thread_pthread.c:2241 miniruby(co_start) thread_pthread_mn.c:469
2025-12-05Revert "gc.c: Pass shape_id to `newobj_init`"Peter Zhu
This reverts commit 228d13f6ed914d1e7f6bd2416e3f5be8283be865. This commit makes default.c and mmtk.c depend on shape.h, which prevents them from building independently.
2025-12-05Allow rb_thread_call_with_gvl() to work when thread already has GVLKeenan Brock
[Feature #20750] Co-authored-by: Benoit Daloze <eregontp@gmail.com>
2025-12-03gc.c: check if the struct has fields before marking the fields_objJean Boussier
If GC trigger in the middle of `struct_alloc`, and the struct has more than 3 elements, then `fields_obj` reference is garbage. We must first check the shape to know if it was actually initialized.
2025-12-03gc.c: Pass shape_id to `newobj_init`Jean Boussier
Attempt to fix the following SEGV: ``` ruby(gc_mark) ../src/gc/default/default.c:4429 ruby(gc_mark_children+0x45) [0x560b380bf8b5] ../src/gc/default/default.c:4625 ruby(gc_mark_stacked_objects) ../src/gc/default/default.c:4647 ruby(gc_mark_stacked_objects_all) ../src/gc/default/default.c:4685 ruby(gc_marks_rest) ../src/gc/default/default.c:5707 ruby(gc_marks+0x4e7) [0x560b380c41c1] ../src/gc/default/default.c:5821 ruby(gc_start) ../src/gc/default/default.c:6502 ruby(heap_prepare+0xa4) [0x560b380c4efc] ../src/gc/default/default.c:2074 ruby(heap_next_free_page) ../src/gc/default/default.c:2289 ruby(newobj_cache_miss) ../src/gc/default/default.c:2396 ruby(RB_SPECIAL_CONST_P+0x0) [0x560b380c5df4] ../src/gc/default/default.c:2420 ruby(RB_BUILTIN_TYPE) ../src/include/ruby/internal/value_type.h:184 ruby(newobj_init) ../src/gc/default/default.c:2136 ruby(rb_gc_impl_new_obj) ../src/gc/default/default.c:2500 ruby(newobj_of) ../src/gc.c:996 ruby(rb_imemo_new+0x37) [0x560b380d8bed] ../src/imemo.c:46 ruby(imemo_fields_new) ../src/imemo.c:105 ruby(rb_imemo_fields_new) ../src/imemo.c:120 ``` I have no reproduction, but my understanding based on the backtrace and error is that GC is triggered inside `newobj_init` causing the new object to be marked while in a incomplete state. I believe the fix is to pass the `shape_id` down to `newobj_init` so it can be set before the GC has a chance to trigger.
2025-12-03Rename `rb_obj_exivar_p` -> `rb_obj_gen_fields_p`Jean Boussier
The "EXIVAR" terminology has been replaced by "gen fields" AKA "generic fields". Exivar implies variable, but generic fields include more than just variables, e.g. `object_id`.
2025-12-03Handle NEWOBJ tracepoints settings fieldsJean Boussier
[Bug #21710] - struct.c: `struct_alloc` It is possible for a `NEWOBJ` tracepoint call back to write fields into a newly allocated object before `struct_alloc` had the time to set the `RSTRUCT_GEN_FIELDS` flags and such. Hence we can't blindly initialize the `fields_obj` reference to `0` we first need to check no fields were added yet. - object.c: `rb_class_allocate_instance` Similarly, if a `NEWOBJ` tracepoint tries to set fields on the object, the `shape_id` must already be set, as it's required on T_OBJECT to know where to write fields. `NEWOBJ_OF` had to be refactored to accept a `shape_id`.
2025-12-02Box: Mark boxes when a class/module is originally defined in it.Satoshi Tagomori
When a class/module defined by extension libraries in a box, checking types of instances of the class needs to access its data type (rb_data_type_t). So if a class still exists (not GCed), the box must exist too (to be marked).
2025-11-26Eliminate redundant work and branching when marking T_OBJECT (#15274)Luke Gruber
2025-11-20Accurate GC.stat under multi-Ractor modeJohn Hawthorn
2025-11-18Fix crash in optimal size for large T_OBJECTJohn Hawthorn
Previously any T_OBJECT with >= 94 IVARs would crash during compaction attempting to make an object too large to embed.
2025-11-09Make rb_gc_obj_optimal_size always return allocatable sizePeter Zhu
It may return sizes that aren't allocatable for arrays and strings.
2025-11-08Move rb_gc_verify_shareable to gc.cPeter Zhu
rb_gc_verify_shareable is not GC implementation specific so it should live in gc.c.
2025-11-07renaming internal data structures and functions from namespace to boxSatoshi Tagomori
2025-11-04Release VM lock before running finalizers (#15050)Luke Gruber
We shouldn't run any ruby code with the VM lock held.
2025-11-04Fix rb_gc_impl_checking_shareable for modular GCJohn Hawthorn
This implements it the same as the other modular GC functions
2025-10-23catch up modular-gcKoichi Sasada
2025-10-23use `SET_SHAREABLE`Koichi Sasada
to adopt strict shareable rule. * (basically) shareable objects only refer shareable objects * (exception) shareable objects can refere unshareable objects but should not leak reference to unshareable objects to Ruby world
2025-10-21Move rb_class_classext_free to class.cPeter Zhu
2025-10-02ZJIT: Add `NoSingletonClass` patch point (#14680)Stan Lo
* ZJIT: Add NoSingletonClass patch point This patch point makes sure that when the object has a singleton class, the JIT code is invalidated. As of now, this is only needed for C call optimization. In YJIT, the singleton class guard only applies to Array, Hash, and String. But in ZJIT, we may optimize C calls from gems (e.g. `sqlite3`). So the patch point needs to be applied to a broader range of classes. * ZJIT: Only generate NoSingletonClass guard when the type can have singleton class * ZJIT: Update or forget NoSingletonClass patch point when needed
2025-09-30ZJIT: Add --zjit-trace-exits (#14640)Aiden Fox Ivey
Add side exit tracing functionality for ZJIT
2025-09-25ZJIT: Actually call rb_zjit_root_update_references()Alan Wu
Previously unused.
2025-09-24Don't require to set PC before allocating hidden objectAlan Wu
ZJIT doesn't set PC before rb_set_ivar(), and that allocates a managed ID table. Was a false positive from gc_validate_pc().
2025-09-23gc_validate_pc(): Exclude imemos, add a test and explain the assertsAlan Wu
The validation is relevant only for traceable userland ruby objects ruby code could interact with. ZJIT's use of rb_vm_method_cfunc_is() allocates a CC imemo and was failing this validation when it was actually fine. Relax the check.
2025-09-18Prevent GC from running during `newobj_of` for internal_event_newobj.Luke Gruber
If another ractor is calling for GC, we need to prevent the current one from joining the barrier. Otherwise, our half-built object will be marked. The repro script was: test.rb: ```ruby require "objspace" 1000.times do ObjectSpace.trace_object_allocations do r = Ractor.new do _obj = 'a' * 1024 end r.join end end ``` $ untilfail lldb -b ./exe/ruby -o "target create ./exe/ruby" -o "run test.rb" -o continue It would fail at `ractor_port_mark`, rp->r was a garbage value. Credit to John for finding the solution. Co-authored-by: John Hawthorn <john.hawthorn@shopify.com>
2025-09-17Fill more of the slot with garbagePeter Zhu
2025-09-17Remove setting v1, v2, v3 when creating a new objectPeter Zhu
Setting v1, v2, v3 when we allocate an object assumes that we always allocate 40 byte objects. By removing v1, v2, v3, we can make the base slot size another size.
2025-09-14Compile `RGENGC_OBJ_INFO` case staticallyNobuyoshi Nakada
Make this macro condition as compile-time constant instead of a preprocess-time constant, and compile the body always.
2025-09-13Fill extra space in newly allocated object with garbagePeter Zhu
This commit fills the space that is not initialized with garbage for newly allocated objects on debug mode.
2025-09-08Move `IS_TYPED_DATA` in RBasic.flagsJean Boussier
Ref: https://github.com/ruby/ruby/pull/14134#issuecomment-3207733725 We can't safely use low-bit pointer tagging anymore because `RTypedData.type` lines up with `RData.dfree` and there is no aligment guarantee on function pointers, as evidenced by `memcached` and `gpgme` gems. We also can't use FL_USER* for this, because extensions may use these for other purposes. Using a general flag for this is a bit unfortunate, as general flags are hard to come by, however I recently freed several of them, and we still have two or three free ones left.
2025-08-27Replace ROBJECT_EMBED by ROBJECT_HEAPJean Boussier
The embed layout is way more common than the heap one, especially since WVA. I think it makes for more readable code to inverse the flag.
2025-08-26Fix ObjectSpace.count_objects to allocate all symbols it uses eagerlyBenoit Daloze
* To not count them as program allocations. * Similar to https://github.com/ruby/ruby/pull/13906
2025-08-25Fix deadlock when malloc in Ractor lockPeter Zhu
If we malloc when the current Ractor is locked, we can deadlock because GC requires VM lock and Ractor barrier. If another Ractor is waiting on this Ractor lock, then it will deadlock because the other Ractor will never join the barrier. For example, this script deadlocks: r = Ractor.new do loop do Ractor::Port.new end end 100000.times do |i| r.send(nil) puts i end On debug builds, it fails with this assertion error: vm_sync.c:75: Assertion Failed: vm_lock_enter:cr->sync.locked_by != rb_ractor_self(cr) On non-debug builds, we can see that it deadlocks in the debugger: Main Ractor: frame #3: 0x000000010021fdc4 miniruby`rb_native_mutex_lock(lock=<unavailable>) at thread_pthread.c:115:14 frame #4: 0x0000000100193eb8 miniruby`ractor_send0 [inlined] ractor_lock(r=<unavailable>, file=<unavailable>, line=1180) at ractor.c:73:5 frame #5: 0x0000000100193eb0 miniruby`ractor_send0 [inlined] ractor_send_basket(ec=<unavailable>, rp=0x0000000131092840, b=0x000000011c63de80, raise_on_error=true) at ractor_sync.c:1180:5 frame #6: 0x0000000100193eac miniruby`ractor_send0(ec=<unavailable>, rp=0x0000000131092840, obj=4, move=<unavailable>, raise_on_error=true) at ractor_sync.c:1211:5 Second Ractor: frame #2: 0x00000001002208d0 miniruby`rb_ractor_sched_barrier_start [inlined] rb_native_cond_wait(cond=<unavailable>, mutex=<unavailable>) at thread_pthread.c:221:13 frame #3: 0x00000001002208cc miniruby`rb_ractor_sched_barrier_start(vm=0x000000013180d600, cr=0x0000000131093460) at thread_pthread.c:1438:13 frame #4: 0x000000010028a328 miniruby`rb_vm_barrier at vm_sync.c:262:13 [artificial] frame #5: 0x00000001000dfa6c miniruby`gc_start [inlined] rb_gc_vm_barrier at gc.c:179:5 frame #6: 0x00000001000dfa68 miniruby`gc_start [inlined] gc_enter(objspace=0x000000013180fc00, event=gc_enter_event_start, lock_lev=<unavailable>) at default.c:6636:9 frame #7: 0x00000001000dfa48 miniruby`gc_start(objspace=0x000000013180fc00, reason=<unavailable>) at default.c:6361:5 frame #8: 0x00000001000e3fd8 miniruby`objspace_malloc_increase_body [inlined] garbage_collect(objspace=0x000000013180fc00, reason=512) at default.c:6341:15 frame #9: 0x00000001000e3fa4 miniruby`objspace_malloc_increase_body [inlined] garbage_collect_with_gvl(objspace=0x000000013180fc00, reason=512) at default.c:6741:16 frame #10: 0x00000001000e3f88 miniruby`objspace_malloc_increase_body(objspace=0x000000013180fc00, mem=<unavailable>, new_size=<unavailable>, old_size=<unavailable>, type=<unavailable>) at default.c:8007:13 frame #11: 0x00000001000e3c44 miniruby`rb_gc_impl_malloc [inlined] objspace_malloc_fixup(objspace=0x000000013180fc00, mem=0x000000011c700000, size=12582912) at default.c:8085:5 frame #12: 0x00000001000e3c30 miniruby`rb_gc_impl_malloc(objspace_ptr=0x000000013180fc00, size=12582912) at default.c:8182:12 frame #13: 0x00000001000d4584 miniruby`ruby_xmalloc [inlined] ruby_xmalloc_body(size=<unavailable>) at gc.c:5128:12 frame #14: 0x00000001000d4568 miniruby`ruby_xmalloc(size=<unavailable>) at gc.c:5118:34 frame #15: 0x00000001001eb184 miniruby`rb_st_init_existing_table_with_size(tab=0x000000011c2b4b40, type=<unavailable>, size=<unavailable>) at st.c:559:39 frame #16: 0x00000001001ebc74 miniruby`rebuild_table_if_necessary [inlined] rb_st_init_table_with_size(type=0x00000001004f4a78, size=524287) at st.c:585:5 frame #17: 0x00000001001ebc5c miniruby`rebuild_table_if_necessary [inlined] rebuild_table(tab=0x000000013108e2f0) at st.c:753:19 frame #18: 0x00000001001ebbfc miniruby`rebuild_table_if_necessary(tab=0x000000013108e2f0) at st.c:1125:9 frame #19: 0x00000001001eba08 miniruby`rb_st_insert(tab=0x000000013108e2f0, key=262144, value=4767566624) at st.c:1143:5 frame #20: 0x0000000100194b84 miniruby`ractor_port_initialzie [inlined] ractor_add_port(r=0x0000000131093460, id=262144) at ractor_sync.c:399:9 frame #21: 0x0000000100194b58 miniruby`ractor_port_initialzie [inlined] ractor_port_init(rpv=4750065560, r=0x0000000131093460) at ractor_sync.c:87:5 frame #22: 0x0000000100194b34 miniruby`ractor_port_initialzie(self=4750065560) at ractor_sync.c:103:12
2025-08-25Get rid of rb_obj_set_shape_idJean Boussier
Now that the shape_id has been unified across all types this helper function doesn't do much over `RBASIC_SET_SHAPE_ID`. It still check if the write is needed, but it doesn't seem useful in places where it's used.
2025-08-21Remove dead rb_obj_is_main_ractorPeter Zhu
2025-08-18Output array shared root flag in rb_raw_obj_info_buitin_typePeter Zhu
2025-08-18Move flags for arrays out of if statements in rb_raw_obj_info_buitin_typePeter Zhu
2025-08-18Remove impossible case in rb_raw_obj_info_buitin_type for arrayPeter Zhu
Since we handle embedded arrays in the if statement above, we don't need to handle it here.
2025-08-15Don't free Ractors in GC shutdownJohn Hawthorn
rb_gc_shutdown_call_finalizer_p returns false for threads and fibers, so it should probably do the same for all Ractors (not just the main one). This hopefully mitigates a bug where, at exit, rb_ractor_terminate_all gets all Ractors to stop before continuing with the shutdown process. However when vm->ractor.cnt reaches 1, the native threads may still be running code at the end co_start, which reads/locks on th->ractor->threads.sched, so the Ractor is not safe to free. A better solution might be to ensure that all native threads end up stopped or otherwise parked before this part of the shutdown, however that would be a bit more involved.
2025-08-13imemo_fields: store owner object in RBasic.klassJean Boussier
It is much more convenient than storing the klass, especially when dealing with `object_id` as it allows to update the id2ref table without having to dereference the owner, which may be garbage at that point.
2025-08-12RTypedData: keep direct reference to IMEMO/fieldsJean Boussier
Similar to f3206cc79bec2fd852e81ec56de59f0a67ab32b7 but for TypedData. It's quite common for TypedData objects to have a mix of reference in their struct and some ivars. Since we do happen to have 8B free in the RtypedData struct, we could use it to keep a direct reference to the IMEMO/fields saving having to synchronize the VM and lookup the `gen_fields_tbl` on every ivar access. For old school Data classes however, we don't have free space, but this API is soft-deprecated and no longer very common.
2025-08-11Fix return value of setting in GC.configPeter Zhu
gc_config_set returned rb_gc_impl_config_get, but gc_config_get also added the implementation key to the return value. This caused the return value of GC.config to differ depending on whether the optional hash argument is provided or not.
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