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Remove card-marking barriers

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Field barriers aren't slower and are more precise.
This commit is contained in:
Andy Wingo 2025-03-07 10:33:10 +01:00
parent 4a95a514b7
commit 6c444b33f1
6 changed files with 0 additions and 36 deletions
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6
api/bdw-attrs.h
View file

@ -49,12 +49,6 @@ static inline uint8_t gc_old_generation_check_alloc_table_young_tag(void) {
static inline enum gc_write_barrier_kind gc_write_barrier_kind(size_t) {
return GC_WRITE_BARRIER_NONE;
}
static inline size_t gc_write_barrier_card_table_alignment(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_card_size(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_field_table_alignment(void) {
GC_CRASH();
}

9
api/gc-api.h
View file

@ -228,15 +228,6 @@ static inline int gc_write_barrier_fast(struct gc_mutator *mut, struct gc_ref ob
switch (gc_write_barrier_kind(obj_size)) {
case GC_WRITE_BARRIER_NONE:
return 0;
case GC_WRITE_BARRIER_CARD: {
size_t card_table_alignment = gc_write_barrier_card_table_alignment();
size_t card_size = gc_write_barrier_card_size();
uintptr_t addr = gc_ref_value(obj);
uintptr_t base = addr & ~(card_table_alignment - 1);
uintptr_t card = (addr & (card_table_alignment - 1)) / card_size;
atomic_store_explicit((uint8_t*)(base + card), 1, memory_order_relaxed);
return 0;
}
case GC_WRITE_BARRIER_FIELD: {
if (!gc_object_is_old_generation(mut, obj, obj_size))
return 0;

3
api/gc-attrs.h
View file

@ -39,14 +39,11 @@ static inline uint8_t gc_old_generation_check_alloc_table_young_tag(void) GC_ALW
enum gc_write_barrier_kind {
GC_WRITE_BARRIER_NONE,
GC_WRITE_BARRIER_CARD,
GC_WRITE_BARRIER_FIELD,
GC_WRITE_BARRIER_SLOW
};
static inline enum gc_write_barrier_kind gc_write_barrier_kind(size_t obj_size) GC_ALWAYS_INLINE;
static inline size_t gc_write_barrier_card_table_alignment(void) GC_ALWAYS_INLINE;
static inline size_t gc_write_barrier_card_size(void) GC_ALWAYS_INLINE;
static inline size_t gc_write_barrier_field_table_alignment(void) GC_ALWAYS_INLINE;
static inline ptrdiff_t gc_write_barrier_field_table_offset(void) GC_ALWAYS_INLINE;
static inline size_t gc_write_barrier_field_fields_per_byte(void) GC_ALWAYS_INLINE;

6
api/mmc-attrs.h
View file

@ -59,12 +59,6 @@ static inline enum gc_write_barrier_kind gc_write_barrier_kind(size_t obj_size)
}
return GC_WRITE_BARRIER_NONE;
}
static inline size_t gc_write_barrier_card_table_alignment(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_card_size(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_field_table_alignment(void) {
GC_ASSERT(GC_GENERATIONAL);
return gc_allocator_alloc_table_alignment();

6
api/pcc-attrs.h
View file

@ -60,12 +60,6 @@ static inline enum gc_write_barrier_kind gc_write_barrier_kind(size_t obj_size)
return GC_WRITE_BARRIER_FIELD;
return GC_WRITE_BARRIER_SLOW;
}
static inline size_t gc_write_barrier_card_table_alignment(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_card_size(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_field_table_alignment(void) {
GC_ASSERT(GC_GENERATIONAL);
return 64 * 1024 * 1024;

6
api/semi-attrs.h
View file

@ -51,12 +51,6 @@ static inline uint8_t gc_old_generation_check_alloc_table_young_tag(void) {
static inline enum gc_write_barrier_kind gc_write_barrier_kind(size_t) {
return GC_WRITE_BARRIER_NONE;
}
static inline size_t gc_write_barrier_card_table_alignment(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_card_size(void) {
GC_CRASH();
}
static inline size_t gc_write_barrier_field_table_alignment(void) {
GC_CRASH();
}