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Prevent rb_define_(class|module) classes from moving

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Before this commit, classes and modules would be registered with the
VM's `defined_module_hash`.  The key was the ID of the class, but that
meant that it was possible for hash collisions to occur.  The compactor
doesn't allow classes in the `defined_module_hash` to move, but if there
is a conflict, then it's possible a class would be removed from the hash
and not get pined.

This commit changes the key / value of the hash just to be the class
itself, thus preventing movement.
This commit is contained in:
Aaron Patterson 2019-04-22 17:14:36 -07:00
parent 660c071659
commit ea520ca927
No known key found for this signature in database
GPG key ID: 953170BCB4FFAFC6
4 changed files with 11 additions and 6 deletions
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3
class.c
View file

@ -659,6 +659,9 @@ rb_define_class(const char *name, VALUE super)
if (rb_class_real(RCLASS_SUPER(klass)) != super) {
rb_raise(rb_eTypeError, "superclass mismatch for class %s", name);
}
/* Class may have been defined in Ruby and not pin-rooted */
rb_vm_add_root_module(id, klass);
return klass;
}
if (!super) {

2
gc.c
View file

@ -8159,7 +8159,7 @@ gc_verify_compaction_references(VALUE mod)
heap_eden->using_page = NULL;
gc_verify_internal_consistency(mod);
rb_gc_enable();
/* GC after compaction to eliminate T_MOVED */
rb_gc();

10
vm.c
View file

@ -2251,9 +2251,8 @@ rb_vm_mark(void *ptr)
rb_gc_mark(vm->loaded_features_snapshot);
rb_gc_mark(vm->top_self);
RUBY_MARK_UNLESS_NULL(vm->coverages);
rb_gc_mark(vm->defined_module_hash);
/* Prevent classes from moving */
rb_mark_tbl(rb_hash_tbl(vm->defined_module_hash, __FILE__, __LINE__));
rb_mark_tbl(vm->defined_module_hash);
if (vm->loading_table) {
rb_mark_tbl(vm->loading_table);
@ -2286,7 +2285,7 @@ rb_vm_add_root_module(ID id, VALUE module)
{
rb_vm_t *vm = GET_VM();
rb_hash_aset(vm->defined_module_hash, ID2SYM(id), module);
st_insert(vm->defined_module_hash, (st_data_t)module, (st_data_t)module);
return TRUE;
}
@ -2561,6 +2560,9 @@ thread_mark(void *ptr)
RUBY_MARK_UNLESS_NULL(th->top_self);
RUBY_MARK_UNLESS_NULL(th->top_wrapper);
if (th->root_fiber) rb_fiber_mark_self(th->root_fiber);
/* Ensure EC stack objects are pinned */
rb_execution_context_mark(th->ec);
RUBY_MARK_UNLESS_NULL(th->stat_insn_usage);
RUBY_MARK_UNLESS_NULL(th->last_status);
RUBY_MARK_UNLESS_NULL(th->locking_mutex);
@ -3230,7 +3232,7 @@ Init_vm_objects(void)
{
rb_vm_t *vm = GET_VM();
vm->defined_module_hash = rb_hash_new();
vm->defined_module_hash = st_init_numtable();
/* initialize mark object array, hash */
vm->mark_object_ary = rb_ary_tmp_new(128);

2
vm_core.h
View file

@ -660,7 +660,7 @@ typedef struct rb_vm_struct {
VALUE coverages;
int coverage_mode;
VALUE defined_module_hash;
st_table * defined_module_hash;
struct rb_objspace *objspace;