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ruby/transient_heap.c

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C
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/**********************************************************************
transient_heap.c - implement transient_heap.
Copyright (C) 2018 Koichi Sasada
**********************************************************************/
#include "debug_counter.h"
#include "gc.h"
#include "internal.h"
#include "internal/gc.h"
#include "internal/hash.h"
#include "internal/sanitizers.h"
#include "internal/static_assert.h"
#include "internal/struct.h"
#include "internal/variable.h"
#include "ruby/debug.h"
#include "ruby/ruby.h"
#include "ruby_assert.h"
#include "transient_heap.h"
#include "vm_debug.h"
#include "vm_sync.h"
#if USE_TRANSIENT_HEAP /* USE_TRANSIENT_HEAP */
/*
* 1: enable assertions
* 2: enable verify all transient heaps
*/
#ifndef TRANSIENT_HEAP_CHECK_MODE
#define TRANSIENT_HEAP_CHECK_MODE 0
#endif
#define TH_ASSERT(expr) RUBY_ASSERT_MESG_WHEN(TRANSIENT_HEAP_CHECK_MODE > 0, expr, #expr)
/*
* 1: show events
* 2: show dump at events
* 3: show all operations
*/
#define TRANSIENT_HEAP_DEBUG 0
/* For Debug: Provide blocks infinitely.
* This mode generates blocks unlimitedly
* and prohibit access free'ed blocks to check invalid access.
*/
#define TRANSIENT_HEAP_DEBUG_INFINITE_BLOCK 0
#if TRANSIENT_HEAP_DEBUG_INFINITE_BLOCK
#include <sys/mman.h>
#include <errno.h>
#endif
/* For Debug: Prohibit promoting to malloc space.
*/
#define TRANSIENT_HEAP_DEBUG_DONT_PROMOTE 0
/* size configuration */
#define TRANSIENT_HEAP_PROMOTED_DEFAULT_SIZE 1024
/* K M */
#define TRANSIENT_HEAP_BLOCK_SIZE (1024 * 32 ) /* 32KB int16_t */
#define TRANSIENT_HEAP_TOTAL_SIZE (1024 * 1024 * 32) /* 32 MB */
#define TRANSIENT_HEAP_ALLOC_MAX (1024 * 2 ) /* 2 KB */
#define TRANSIENT_HEAP_BLOCK_NUM (TRANSIENT_HEAP_TOTAL_SIZE / TRANSIENT_HEAP_BLOCK_SIZE)
#define TRANSIENT_HEAP_ALLOC_MAGIC 0xfeab
#define TRANSIENT_HEAP_ALLOC_ALIGN RUBY_ALIGNOF(void *)
#define TRANSIENT_HEAP_ALLOC_MARKING_LAST -1
#define TRANSIENT_HEAP_ALLOC_MARKING_FREE -2
enum transient_heap_status {
transient_heap_none,
transient_heap_marking,
transient_heap_escaping
};
struct transient_heap_block {
struct transient_heap_block_header {
int16_t size; /* sizeof(block) = TRANSIENT_HEAP_BLOCK_SIZE - sizeof(struct transient_heap_block_header) */
int16_t index;
int16_t last_marked_index;
int16_t objects;
struct transient_heap_block *next_block;
} info;
char buff[TRANSIENT_HEAP_BLOCK_SIZE - sizeof(struct transient_heap_block_header)];
};
struct transient_heap {
struct transient_heap_block *using_blocks;
struct transient_heap_block *marked_blocks;
struct transient_heap_block *free_blocks;
int total_objects;
int total_marked_objects;
int total_blocks;
enum transient_heap_status status;
VALUE *promoted_objects;
int promoted_objects_size;
int promoted_objects_index;
struct transient_heap_block *arena;
int arena_index; /* increment only */
};
struct transient_alloc_header {
uint16_t magic;
uint16_t size;
int16_t next_marked_index;
int16_t dummy;
VALUE obj;
};
static struct transient_heap global_transient_heap;
static void transient_heap_promote_add(struct transient_heap* theap, VALUE obj);
static const void *transient_heap_ptr(VALUE obj, int error);
static int transient_header_managed_ptr_p(struct transient_heap* theap, const void *ptr);
#define ROUND_UP(v, a) (((size_t)(v) + (a) - 1) & ~((a) - 1))
static void
transient_heap_block_dump(struct transient_heap* theap, struct transient_heap_block *block)
{
int i=0, n=0;
while (i<block->info.index) {
void *ptr = &block->buff[i];
struct transient_alloc_header *header = ptr;
fprintf(stderr, "%4d %8d %p size:%4d next:%4d %s\n", n, i, ptr, header->size, header->next_marked_index, rb_obj_info(header->obj));
i += header->size;
n++;
}
}
static void
transient_heap_blocks_dump(struct transient_heap* theap, struct transient_heap_block *block, const char *type_str)
{
while (block) {
fprintf(stderr, "- transient_heap_dump: %s:%p index:%d objects:%d last_marked_index:%d next:%p\n",
type_str, (void *)block, block->info.index, block->info.objects, block->info.last_marked_index, (void *)block->info.next_block);
transient_heap_block_dump(theap, block);
block = block->info.next_block;
}
}
static void
transient_heap_dump(struct transient_heap* theap)
{
fprintf(stderr, "transient_heap_dump objects:%d marked_objects:%d blocks:%d\n", theap->total_objects, theap->total_marked_objects, theap->total_blocks);
transient_heap_blocks_dump(theap, theap->using_blocks, "using_blocks");
transient_heap_blocks_dump(theap, theap->marked_blocks, "marked_blocks");
transient_heap_blocks_dump(theap, theap->free_blocks, "free_blocks");
}
/* Debug: dump all tarnsient_heap blocks */
void
rb_transient_heap_dump(void)
{
transient_heap_dump(&global_transient_heap);
}
#if TRANSIENT_HEAP_CHECK_MODE >= 2
ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(static void transient_heap_ptr_check(struct transient_heap *theap, VALUE obj));
static void
transient_heap_ptr_check(struct transient_heap *theap, VALUE obj)
{
if (obj != Qundef) {
const void *ptr = transient_heap_ptr(obj, FALSE);
TH_ASSERT(ptr == NULL || transient_header_managed_ptr_p(theap, ptr));
}
}
ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(static int transient_heap_block_verify(struct transient_heap *theap, struct transient_heap_block *block));
static int
transient_heap_block_verify(struct transient_heap *theap, struct transient_heap_block *block)
{
int i=0, n=0;
struct transient_alloc_header *header;
while (i<block->info.index) {
header = (void *)&block->buff[i];
TH_ASSERT(header->magic == TRANSIENT_HEAP_ALLOC_MAGIC);
transient_heap_ptr_check(theap, header->obj);
n ++;
i += header->size;
}
TH_ASSERT(block->info.objects == n);
return n;
}
static int
transient_heap_blocks_verify(struct transient_heap *theap, struct transient_heap_block *blocks, int *block_num_ptr)
{
int n = 0;
struct transient_heap_block *block = blocks;
while (block) {
n += transient_heap_block_verify(theap, block);
*block_num_ptr += 1;
block = block->info.next_block;
}
return n;
}
#endif
static void
transient_heap_verify(struct transient_heap *theap)
{
#if TRANSIENT_HEAP_CHECK_MODE >= 2
int n=0, block_num=0;
n += transient_heap_blocks_verify(theap, theap->using_blocks, &block_num);
n += transient_heap_blocks_verify(theap, theap->marked_blocks, &block_num);
TH_ASSERT(n == theap->total_objects);
TH_ASSERT(n >= theap->total_marked_objects);
TH_ASSERT(block_num == theap->total_blocks);
#endif
}
/* Debug: check assertions for all transient_heap blocks */
void
rb_transient_heap_verify(void)
{
transient_heap_verify(&global_transient_heap);
}
static struct transient_heap*
transient_heap_get(void)
{
struct transient_heap* theap = &global_transient_heap;
transient_heap_verify(theap);
return theap;
}
static void
reset_block(struct transient_heap_block *block)
{
__msan_allocated_memory(block, sizeof block);
block->info.size = TRANSIENT_HEAP_BLOCK_SIZE - sizeof(struct transient_heap_block_header);
block->info.index = 0;
block->info.objects = 0;
block->info.last_marked_index = TRANSIENT_HEAP_ALLOC_MARKING_LAST;
block->info.next_block = NULL;
__asan_poison_memory_region(&block->buff, sizeof block->buff);
}
static void
connect_to_free_blocks(struct transient_heap *theap, struct transient_heap_block *block)
{
block->info.next_block = theap->free_blocks;
theap->free_blocks = block;
}
static void
connect_to_using_blocks(struct transient_heap *theap, struct transient_heap_block *block)
{
block->info.next_block = theap->using_blocks;
theap->using_blocks = block;
}
#if 0
static void
connect_to_marked_blocks(struct transient_heap *theap, struct transient_heap_block *block)
{
block->info.next_block = theap->marked_blocks;
theap->marked_blocks = block;
}
#endif
static void
append_to_marked_blocks(struct transient_heap *theap, struct transient_heap_block *append_blocks)
{
if (theap->marked_blocks) {
struct transient_heap_block *block = theap->marked_blocks, *last_block = NULL;
while (block) {
last_block = block;
block = block->info.next_block;
}
TH_ASSERT(last_block->info.next_block == NULL);
last_block->info.next_block = append_blocks;
}
else {
theap->marked_blocks = append_blocks;
}
}
static struct transient_heap_block *
transient_heap_block_alloc(struct transient_heap* theap)
{
struct transient_heap_block *block;
#if TRANSIENT_HEAP_DEBUG_INFINITE_BLOCK
block = mmap(NULL, TRANSIENT_HEAP_BLOCK_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
if (block == MAP_FAILED) rb_bug("transient_heap_block_alloc: err:%d\n", errno);
#else
if (theap->arena == NULL) {
theap->arena = rb_aligned_malloc(TRANSIENT_HEAP_BLOCK_SIZE, TRANSIENT_HEAP_TOTAL_SIZE);
if (theap->arena == NULL) {
rb_bug("transient_heap_block_alloc: failed\n");
}
}
TH_ASSERT(theap->arena_index < TRANSIENT_HEAP_BLOCK_NUM);
block = &theap->arena[theap->arena_index++];
TH_ASSERT(((intptr_t)block & (TRANSIENT_HEAP_BLOCK_SIZE - 1)) == 0);
#endif
reset_block(block);
TH_ASSERT(((intptr_t)block->buff & (TRANSIENT_HEAP_ALLOC_ALIGN-1)) == 0);
if (0) fprintf(stderr, "transient_heap_block_alloc: %4d %p\n", theap->total_blocks, (void *)block);
return block;
}
static struct transient_heap_block *
transient_heap_allocatable_block(struct transient_heap* theap)
{
struct transient_heap_block *block;
#if TRANSIENT_HEAP_DEBUG_INFINITE_BLOCK
block = transient_heap_block_alloc(theap);
theap->total_blocks++;
#else
/* get one block from free_blocks */
block = theap->free_blocks;
if (block) {
theap->free_blocks = block->info.next_block;
block->info.next_block = NULL;
theap->total_blocks++;
}
#endif
return block;
}
static struct transient_alloc_header *
transient_heap_allocatable_header(struct transient_heap* theap, size_t size)
{
struct transient_heap_block *block = theap->using_blocks;
while (block) {
TH_ASSERT(block->info.size >= block->info.index);
if (block->info.size - block->info.index >= (int32_t)size) {
struct transient_alloc_header *header = (void *)&block->buff[block->info.index];
block->info.index += size;
block->info.objects++;
return header;
}
else {
block = transient_heap_allocatable_block(theap);
if (block) connect_to_using_blocks(theap, block);
}
}
return NULL;
}
void *
rb_transient_heap_alloc(VALUE obj, size_t req_size)
{
void *ret;
RB_VM_LOCK_ENTER();
{
struct transient_heap* theap = transient_heap_get();
size_t size = ROUND_UP(req_size + sizeof(struct transient_alloc_header), TRANSIENT_HEAP_ALLOC_ALIGN);
TH_ASSERT(RB_TYPE_P(obj, T_ARRAY) ||
RB_TYPE_P(obj, T_OBJECT) ||
RB_TYPE_P(obj, T_STRUCT) ||
RB_TYPE_P(obj, T_HASH)); /* supported types */
if (size > TRANSIENT_HEAP_ALLOC_MAX) {
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "rb_transient_heap_alloc: [too big: %ld] %s\n", (long)size, rb_obj_info(obj));
ret = NULL;
}
#if TRANSIENT_HEAP_DEBUG_DONT_PROMOTE == 0
else if (RB_OBJ_PROMOTED_RAW(obj)) {
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "rb_transient_heap_alloc: [promoted object] %s\n", rb_obj_info(obj));
ret = NULL;
}
#else
else if (RBASIC_CLASS(obj) == 0) {
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "rb_transient_heap_alloc: [hidden object] %s\n", rb_obj_info(obj));
ret = NULL;
}
#endif
else {
struct transient_alloc_header *header = transient_heap_allocatable_header(theap, size);
if (header) {
void *ptr;
/* header is poisoned to prevent buffer overflow, should
* unpoison first... */
asan_unpoison_memory_region(header, sizeof *header, true);
header->size = size;
header->magic = TRANSIENT_HEAP_ALLOC_MAGIC;
header->next_marked_index = TRANSIENT_HEAP_ALLOC_MARKING_FREE;
header->obj = obj; /* TODO: can we eliminate it? */
/* header is fixed; shall poison again */
asan_poison_memory_region(header, sizeof *header);
ptr = header + 1;
theap->total_objects++; /* statistics */
#if TRANSIENT_HEAP_DEBUG_DONT_PROMOTE
if (RB_OBJ_PROMOTED_RAW(obj)) {
transient_heap_promote_add(theap, obj);
}
#endif
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "rb_transient_heap_alloc: header:%p ptr:%p size:%d obj:%s\n", (void *)header, ptr, (int)size, rb_obj_info(obj));
RB_DEBUG_COUNTER_INC(theap_alloc);
/* ptr is set up; OK to unpoison. */
asan_unpoison_memory_region(ptr, size - sizeof *header, true);
ret = ptr;
}
else {
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "rb_transient_heap_alloc: [no enough space: %ld] %s\n", (long)size, rb_obj_info(obj));
RB_DEBUG_COUNTER_INC(theap_alloc_fail);
ret = NULL;
}
}
}
RB_VM_LOCK_LEAVE();
return ret;
}
void
Init_TransientHeap(void)
{
int i, block_num;
struct transient_heap* theap = transient_heap_get();
#if TRANSIENT_HEAP_DEBUG_INFINITE_BLOCK
block_num = 0;
#else
TH_ASSERT(TRANSIENT_HEAP_BLOCK_SIZE * TRANSIENT_HEAP_BLOCK_NUM == TRANSIENT_HEAP_TOTAL_SIZE);
block_num = TRANSIENT_HEAP_BLOCK_NUM;
#endif
for (i=0; i<block_num; i++) {
connect_to_free_blocks(theap, transient_heap_block_alloc(theap));
}
theap->using_blocks = transient_heap_allocatable_block(theap);
theap->promoted_objects_size = TRANSIENT_HEAP_PROMOTED_DEFAULT_SIZE;
theap->promoted_objects_index = 0;
/* should not use ALLOC_N to be free from GC */
theap->promoted_objects = malloc(sizeof(VALUE) * theap->promoted_objects_size);
STATIC_ASSERT(
integer_overflow,
sizeof(VALUE) <= SIZE_MAX / TRANSIENT_HEAP_PROMOTED_DEFAULT_SIZE);
if (theap->promoted_objects == NULL) rb_bug("Init_TransientHeap: malloc failed.");
}
static struct transient_heap_block *
blocks_alloc_header_to_block(struct transient_heap *theap, struct transient_heap_block *blocks, struct transient_alloc_header *header)
{
struct transient_heap_block *block = blocks;
while (block) {
if (block->buff <= (char *)header && (char *)header < block->buff + block->info.size) {
return block;
}
block = block->info.next_block;
}
return NULL;
}
static struct transient_heap_block *
alloc_header_to_block_verbose(struct transient_heap *theap, struct transient_alloc_header *header)
{
struct transient_heap_block *block;
if ((block = blocks_alloc_header_to_block(theap, theap->marked_blocks, header)) != NULL) {
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "alloc_header_to_block: found in marked_blocks\n");
return block;
}
else if ((block = blocks_alloc_header_to_block(theap, theap->using_blocks, header)) != NULL) {
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "alloc_header_to_block: found in using_blocks\n");
return block;
}
else {
return NULL;
}
}
static struct transient_alloc_header *
ptr_to_alloc_header(const void *ptr)
{
struct transient_alloc_header *header = (void *)ptr;
header -= 1;
return header;
}
static int
transient_header_managed_ptr_p(struct transient_heap* theap, const void *ptr)
{
if (alloc_header_to_block_verbose(theap, ptr_to_alloc_header(ptr))) {
return TRUE;
}
else {
return FALSE;
}
}
int
rb_transient_heap_managed_ptr_p(const void *ptr)
{
return transient_header_managed_ptr_p(transient_heap_get(), ptr);
}
static struct transient_heap_block *
alloc_header_to_block(struct transient_heap *theap, struct transient_alloc_header *header)
{
struct transient_heap_block *block;
#if TRANSIENT_HEAP_DEBUG_INFINITE_BLOCK
block = alloc_header_to_block_verbose(theap, header);
if (block == NULL) {
transient_heap_dump(theap);
rb_bug("alloc_header_to_block: not found in mark_blocks (%p)\n", header);
}
#else
block = (void *)((intptr_t)header & ~(TRANSIENT_HEAP_BLOCK_SIZE-1));
TH_ASSERT(block == alloc_header_to_block_verbose(theap, header));
#endif
return block;
}
void
rb_transient_heap_mark(VALUE obj, const void *ptr)
{
ASSERT_vm_locking();
struct transient_alloc_header *header = ptr_to_alloc_header(ptr);
asan_unpoison_memory_region(header, sizeof *header, false);
if (header->magic != TRANSIENT_HEAP_ALLOC_MAGIC) rb_bug("rb_transient_heap_mark: wrong header, %s (%p)", rb_obj_info(obj), ptr);
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "rb_transient_heap_mark: %s (%p)\n", rb_obj_info(obj), ptr);
#if TRANSIENT_HEAP_CHECK_MODE > 0
{
struct transient_heap* theap = transient_heap_get();
TH_ASSERT(theap->status == transient_heap_marking);
TH_ASSERT(transient_header_managed_ptr_p(theap, ptr));
if (header->magic != TRANSIENT_HEAP_ALLOC_MAGIC) {
transient_heap_dump(theap);
rb_bug("rb_transient_heap_mark: magic is broken");
}
else if (header->obj != obj) {
// transient_heap_dump(theap);
rb_bug("rb_transient_heap_mark: unmatch (%s is stored, but %s is given)\n",
rb_obj_info(header->obj), rb_obj_info(obj));
}
}
#endif
if (header->next_marked_index != TRANSIENT_HEAP_ALLOC_MARKING_FREE) {
/* already marked */
return;
}
else {
struct transient_heap* theap = transient_heap_get();
struct transient_heap_block *block = alloc_header_to_block(theap, header);
__asan_unpoison_memory_region(&block->info, sizeof block->info);
header->next_marked_index = block->info.last_marked_index;
block->info.last_marked_index = (int)((char *)header - block->buff);
theap->total_marked_objects++;
transient_heap_verify(theap);
}
}
ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(static const void *transient_heap_ptr(VALUE obj, int error));
static const void *
transient_heap_ptr(VALUE obj, int error)
{
const void *ptr = NULL;
switch (BUILTIN_TYPE(obj)) {
case T_ARRAY:
if (RARRAY_TRANSIENT_P(obj)) {
TH_ASSERT(!FL_TEST_RAW(obj, RARRAY_EMBED_FLAG));
ptr = RARRAY(obj)->as.heap.ptr;
}
break;
case T_OBJECT:
if (ROBJ_TRANSIENT_P(obj)) {
ptr = ROBJECT_IVPTR(obj);
}
break;
case T_STRUCT:
if (RSTRUCT_TRANSIENT_P(obj)) {
ptr = rb_struct_const_heap_ptr(obj);
}
break;
case T_HASH:
if (RHASH_TRANSIENT_P(obj)) {
TH_ASSERT(RHASH_AR_TABLE_P(obj));
ptr = (VALUE *)(RHASH(obj)->as.ar);
}
else {
ptr = NULL;
}
break;
default:
if (error) {
rb_bug("transient_heap_ptr: unknown obj %s\n", rb_obj_info(obj));
}
}
return ptr;
}
static void
transient_heap_promote_add(struct transient_heap* theap, VALUE obj)
{
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, "rb_transient_heap_promote: %s\n", rb_obj_info(obj));
if (TRANSIENT_HEAP_DEBUG_DONT_PROMOTE) {
/* duplicate check */
int i;
for (i=0; i<theap->promoted_objects_index; i++) {
if (theap->promoted_objects[i] == obj) return;
}
}
if (theap->promoted_objects_size <= theap->promoted_objects_index) {
theap->promoted_objects_size *= 2;
if (TRANSIENT_HEAP_DEBUG >= 1) fprintf(stderr, "rb_transient_heap_promote: expand table to %d\n", theap->promoted_objects_size);
if (UNLIKELY((size_t)theap->promoted_objects_size > SIZE_MAX / sizeof(VALUE))) {
/* realloc failure due to integer overflow */
theap->promoted_objects = NULL;
}
else {
theap->promoted_objects = realloc(theap->promoted_objects, theap->promoted_objects_size * sizeof(VALUE));
}
if (theap->promoted_objects == NULL) rb_bug("rb_transient_heap_promote: realloc failed");
}
theap->promoted_objects[theap->promoted_objects_index++] = obj;
}
void
rb_transient_heap_promote(VALUE obj)
{
ASSERT_vm_locking();
if (transient_heap_ptr(obj, FALSE)) {
struct transient_heap* theap = transient_heap_get();
transient_heap_promote_add(theap, obj);
}
else {
/* ignore */
}
}
static struct transient_alloc_header *
alloc_header(struct transient_heap_block* block, int index)
{
return (void *)&block->buff[index];
}
static void
transient_heap_reset(void)
{
ASSERT_vm_locking();
struct transient_heap* theap = transient_heap_get();
struct transient_heap_block* block;
if (TRANSIENT_HEAP_DEBUG >= 1) fprintf(stderr, "!! transient_heap_reset\n");
block = theap->marked_blocks;
while (block) {
struct transient_heap_block *next_block = block->info.next_block;
theap->total_objects -= block->info.objects;
#if TRANSIENT_HEAP_DEBUG_INFINITE_BLOCK
if (madvise(block, TRANSIENT_HEAP_BLOCK_SIZE, MADV_DONTNEED) != 0) {
rb_bug("madvise err:%d", errno);
}
if (mprotect(block, TRANSIENT_HEAP_BLOCK_SIZE, PROT_NONE) != 0) {
rb_bug("mprotect err:%d", errno);
}
#else
reset_block(block);
connect_to_free_blocks(theap, block);
#endif
theap->total_blocks--;
block = next_block;
}
if (TRANSIENT_HEAP_DEBUG >= 1) fprintf(stderr, "!! transient_heap_reset block_num:%d\n", theap->total_blocks);
theap->marked_blocks = NULL;
theap->total_marked_objects = 0;
}
static void
transient_heap_block_evacuate(struct transient_heap* theap, struct transient_heap_block* block)
{
int marked_index = block->info.last_marked_index;
block->info.last_marked_index = TRANSIENT_HEAP_ALLOC_MARKING_LAST;
while (marked_index >= 0) {
struct transient_alloc_header *header = alloc_header(block, marked_index);
VALUE obj = header->obj;
TH_ASSERT(header->magic == TRANSIENT_HEAP_ALLOC_MAGIC);
if (header->magic != TRANSIENT_HEAP_ALLOC_MAGIC) rb_bug("rb_transient_heap_mark: wrong header %s\n", rb_obj_info(obj));
if (TRANSIENT_HEAP_DEBUG >= 3) fprintf(stderr, " * transient_heap_block_evacuate %p %s\n", (void *)header, rb_obj_info(obj));
if (obj != Qnil) {
RB_DEBUG_COUNTER_INC(theap_evacuate);
switch (BUILTIN_TYPE(obj)) {
case T_ARRAY:
rb_ary_transient_heap_evacuate(obj, !TRANSIENT_HEAP_DEBUG_DONT_PROMOTE);
break;
case T_OBJECT:
rb_obj_transient_heap_evacuate(obj, !TRANSIENT_HEAP_DEBUG_DONT_PROMOTE);
break;
case T_STRUCT:
rb_struct_transient_heap_evacuate(obj, !TRANSIENT_HEAP_DEBUG_DONT_PROMOTE);
break;
case T_HASH:
rb_hash_transient_heap_evacuate(obj, !TRANSIENT_HEAP_DEBUG_DONT_PROMOTE);
break;
default:
rb_bug("unsupporeted: %s\n", rb_obj_info(obj));
}
header->obj = Qundef; /* for debug */
}
marked_index = header->next_marked_index;
}
}
#if USE_RUBY_DEBUG_LOG
static const char *
transient_heap_status_cstr(enum transient_heap_status status)
{
switch (status) {
case transient_heap_none: return "none";
case transient_heap_marking: return "marking";
case transient_heap_escaping: return "escaping";
}
UNREACHABLE_RETURN(NULL);
}
#endif
static void
transient_heap_update_status(struct transient_heap* theap, enum transient_heap_status status)
{
RUBY_DEBUG_LOG("%s -> %s",
transient_heap_status_cstr(theap->status),
transient_heap_status_cstr(status));
TH_ASSERT(theap->status != status);
theap->status = status;
}
static void
transient_heap_evacuate(void *dmy)
{
RB_VM_LOCK_ENTER();
{
struct transient_heap* theap = transient_heap_get();
if (theap->status == transient_heap_marking) {
if (TRANSIENT_HEAP_DEBUG >= 1) fprintf(stderr, "!! transient_heap_evacuate: skip while transient_heap_marking\n");
}
else {
VALUE gc_disabled = rb_gc_disable_no_rest();
struct transient_heap_block* block;
RUBY_DEBUG_LOG("start gc_disabled:%d", RTEST(gc_disabled));
if (TRANSIENT_HEAP_DEBUG >= 1) {
int i;
fprintf(stderr, "!! transient_heap_evacuate start total_blocks:%d\n", theap->total_blocks);
if (TRANSIENT_HEAP_DEBUG >= 4) {
for (i=0; i<theap->promoted_objects_index; i++) fprintf(stderr, "%4d %s\n", i, rb_obj_info(theap->promoted_objects[i]));
}
}
if (TRANSIENT_HEAP_DEBUG >= 2) transient_heap_dump(theap);
TH_ASSERT(theap->status == transient_heap_none);
transient_heap_update_status(theap, transient_heap_escaping);
/* evacuate from marked blocks */
block = theap->marked_blocks;
while (block) {
transient_heap_block_evacuate(theap, block);
block = block->info.next_block;
}
/* evacuate from using blocks
only affect incremental marking */
block = theap->using_blocks;
while (block) {
transient_heap_block_evacuate(theap, block);
block = block->info.next_block;
}
/* all objects in marked_objects are escaped. */
transient_heap_reset();
if (TRANSIENT_HEAP_DEBUG > 0) {
fprintf(stderr, "!! transient_heap_evacuate end total_blocks:%d\n", theap->total_blocks);
}
transient_heap_verify(theap);
transient_heap_update_status(theap, transient_heap_none);
if (gc_disabled != Qtrue) rb_gc_enable();
RUBY_DEBUG_LOG("finish", 0);
}
}
RB_VM_LOCK_LEAVE();
}
static void
clear_marked_index(struct transient_heap_block* block)
{
int marked_index = block->info.last_marked_index;
while (marked_index != TRANSIENT_HEAP_ALLOC_MARKING_LAST) {
struct transient_alloc_header *header = alloc_header(block, marked_index);
/* header is poisoned to prevent buffer overflow, should
* unpoison first... */
asan_unpoison_memory_region(header, sizeof *header, false);
TH_ASSERT(marked_index != TRANSIENT_HEAP_ALLOC_MARKING_FREE);
if (0) fprintf(stderr, "clear_marked_index - block:%p mark_index:%d\n", (void *)block, marked_index);
marked_index = header->next_marked_index;
header->next_marked_index = TRANSIENT_HEAP_ALLOC_MARKING_FREE;
}
block->info.last_marked_index = TRANSIENT_HEAP_ALLOC_MARKING_LAST;
}
static void
blocks_clear_marked_index(struct transient_heap_block* block)
{
while (block) {
clear_marked_index(block);
block = block->info.next_block;
}
}
static void
transient_heap_block_update_refs(struct transient_heap* theap, struct transient_heap_block* block)
{
int i=0, n=0;
while (i<block->info.index) {
void *ptr = &block->buff[i];
struct transient_alloc_header *header = ptr;
asan_unpoison_memory_region(header, sizeof *header, false);
void *poisoned = __asan_region_is_poisoned((void *)header->obj, SIZEOF_VALUE);
asan_unpoison_object(header->obj, false);
header->obj = rb_gc_location(header->obj);
if (poisoned) {
asan_poison_object(header->obj);
}
i += header->size;
asan_poison_memory_region(header, sizeof *header);
n++;
}
}
static void
transient_heap_blocks_update_refs(struct transient_heap* theap, struct transient_heap_block *block, const char *type_str)
{
while (block) {
transient_heap_block_update_refs(theap, block);
block = block->info.next_block;
}
}
void
rb_transient_heap_update_references(void)
{
ASSERT_vm_locking();
struct transient_heap* theap = transient_heap_get();
int i;
transient_heap_blocks_update_refs(theap, theap->using_blocks, "using_blocks");
transient_heap_blocks_update_refs(theap, theap->marked_blocks, "marked_blocks");
for (i=0; i<theap->promoted_objects_index; i++) {
VALUE obj = theap->promoted_objects[i];
theap->promoted_objects[i] = rb_gc_location(obj);
}
}
void
rb_transient_heap_start_marking(int full_marking)
{
ASSERT_vm_locking();
RUBY_DEBUG_LOG("full?:%d", full_marking);
struct transient_heap* theap = transient_heap_get();
if (TRANSIENT_HEAP_DEBUG >= 1) fprintf(stderr, "!! rb_transient_heap_start_marking objects:%d blocks:%d promtoed:%d full_marking:%d\n",
theap->total_objects, theap->total_blocks, theap->promoted_objects_index, full_marking);
if (TRANSIENT_HEAP_DEBUG >= 2) transient_heap_dump(theap);
blocks_clear_marked_index(theap->marked_blocks);
blocks_clear_marked_index(theap->using_blocks);
if (theap->using_blocks) {
if (theap->using_blocks->info.objects > 0) {
append_to_marked_blocks(theap, theap->using_blocks);
theap->using_blocks = NULL;
}
else {
append_to_marked_blocks(theap, theap->using_blocks->info.next_block);
theap->using_blocks->info.next_block = NULL;
}
}
if (theap->using_blocks == NULL) {
theap->using_blocks = transient_heap_allocatable_block(theap);
}
TH_ASSERT(theap->status == transient_heap_none);
transient_heap_update_status(theap, transient_heap_marking);
theap->total_marked_objects = 0;
if (full_marking) {
theap->promoted_objects_index = 0;
}
else { /* mark promoted objects */
int i;
for (i=0; i<theap->promoted_objects_index; i++) {
VALUE obj = theap->promoted_objects[i];
const void *ptr = transient_heap_ptr(obj, TRUE);
if (ptr) {
rb_transient_heap_mark(obj, ptr);
}
}
}
transient_heap_verify(theap);
}
void
rb_transient_heap_finish_marking(void)
{
ASSERT_vm_locking();
RUBY_DEBUG_LOG("", 0);
struct transient_heap* theap = transient_heap_get();
if (TRANSIENT_HEAP_DEBUG >= 1) fprintf(stderr, "!! rb_transient_heap_finish_marking objects:%d, marked:%d\n",
theap->total_objects,
theap->total_marked_objects);
if (TRANSIENT_HEAP_DEBUG >= 2) transient_heap_dump(theap);
TH_ASSERT(theap->total_objects >= theap->total_marked_objects);
TH_ASSERT(theap->status == transient_heap_marking);
transient_heap_update_status(theap, transient_heap_none);
if (theap->total_marked_objects > 0) {
if (TRANSIENT_HEAP_DEBUG >= 1) fprintf(stderr, "-> rb_transient_heap_finish_marking register escape func.\n");
rb_postponed_job_register_one(0, transient_heap_evacuate, NULL);
}
else {
transient_heap_reset();
}
transient_heap_verify(theap);
}
#endif /* USE_TRANSIENT_HEAP */
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