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php-src/ext/opcache/Optimizer/compact_literals.c

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/* pass 11
* - compact literals table
*/
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
#define DEBUG_COMPACT_LITERALS 0
#define LITERAL_VALUE 0x0100
#define LITERAL_FUNC 0x0200
#define LITERAL_CLASS 0x0300
#define LITERAL_CONST 0x0400
#define LITERAL_CLASS_CONST 0x0500
#define LITERAL_STATIC_METHOD 0x0600
#define LITERAL_STATIC_PROPERTY 0x0700
#define LITERAL_METHOD 0x0800
#define LITERAL_PROPERTY 0x0900
#define LITERAL_EX_CLASS 0x4000
#define LITERAL_EX_OBJ 0x2000
#define LITERAL_MAY_MERGE 0x1000
#define LITERAL_KIND_MASK 0x0f00
#define LITERAL_NUM_RELATED_MASK 0x000f
#define LITERAL_NUM_SLOTS_MASK 0x00f0
#define LITERAL_NUM_SLOTS_SHIFT 4
#define LITERAL_NUM_RELATED(info) (info & LITERAL_NUM_RELATED_MASK)
#define LITERAL_NUM_SLOTS(info) ((info & LITERAL_NUM_SLOTS_MASK) >> LITERAL_NUM_SLOTS_SHIFT)
typedef struct _literal_info {
zend_uint flags; /* bitmask (see defines above) */
union {
int num; /* variable number or class name literal number */
} u;
} literal_info;
#define LITERAL_FLAGS(kind, slots, related) \
((kind) | ((slots) << LITERAL_NUM_SLOTS_SHIFT) | (related))
#define LITERAL_INFO(n, kind, merge, slots, related) do { \
info[n].flags = (((merge) ? LITERAL_MAY_MERGE : 0) | LITERAL_FLAGS(kind, slots, related)); \
} while (0)
#define LITERAL_INFO_CLASS(n, kind, merge, slots, related, _num) do { \
info[n].flags = (LITERAL_EX_CLASS | ((merge) ? LITERAL_MAY_MERGE : 0) | LITERAL_FLAGS(kind, slots, related)); \
info[n].u.num = (_num); \
} while (0)
#define LITERAL_INFO_OBJ(n, kind, merge, slots, related, _num) do { \
info[n].flags = (LITERAL_EX_OBJ | ((merge) ? LITERAL_MAY_MERGE : 0) | LITERAL_FLAGS(kind, slots, related)); \
info[n].u.num = (_num); \
} while (0)
static void optimizer_literal_obj_info(literal_info *info,
zend_uchar op_type,
znode_op op,
int constant,
zend_uint kind,
zend_uint slots,
zend_uint related,
zend_op_array *op_array)
{
/* For now we merge only $this object properties and methods.
* In general it's also possible to do it for any CV variable as well,
* but it would require complex dataflow and/or type analysis.
*/
if (Z_TYPE(op_array->literals[constant]) == IS_STRING &&
op_type == IS_UNUSED) {
LITERAL_INFO_OBJ(constant, kind, 1, slots, related, op_array->this_var);
} else {
LITERAL_INFO(constant, kind, 0, slots, related);
}
}
static void optimizer_literal_class_info(literal_info *info,
zend_uchar op_type,
znode_op op,
int constant,
zend_uint kind,
zend_uint slots,
zend_uint related,
zend_op_array *op_array)
{
if (op_type == IS_CONST) {
LITERAL_INFO_CLASS(constant, kind, 1, slots, related, op.constant);
} else {
LITERAL_INFO(constant, kind, 0, slots, related);
}
}
static void optimizer_compact_literals(zend_op_array *op_array, zend_optimizer_ctx *ctx TSRMLS_DC)
{
zend_op *opline, *end;
int i, j, n, *map, cache_slots;
zval zv, *pos;
literal_info *info;
int l_null = -1;
int l_false = -1;
int l_true = -1;
HashTable hash;
zend_string *key = NULL;
void *checkpoint = zend_arena_checkpoint(ctx->arena);
if (op_array->last_literal) {
info = (literal_info*)zend_arena_calloc(&ctx->arena, op_array->last_literal, sizeof(literal_info));
/* Mark literals of specific types */
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
switch (opline->opcode) {
case ZEND_DO_FCALL:
LITERAL_INFO(opline->op1.constant, LITERAL_FUNC, 1, 1, 1);
break;
case ZEND_INIT_FCALL_BY_NAME:
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op2.constant, LITERAL_FUNC, 1, 1, 2);
}
break;
case ZEND_INIT_NS_FCALL_BY_NAME:
LITERAL_INFO(opline->op2.constant, LITERAL_FUNC, 1, 1, 3);
break;
case ZEND_INIT_METHOD_CALL:
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
optimizer_literal_obj_info(
info,
opline->op1_type,
opline->op1,
opline->op2.constant,
LITERAL_METHOD, 2, 2,
op_array);
}
break;
case ZEND_INIT_STATIC_METHOD_CALL:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op1.constant, LITERAL_CLASS, 1, 1, 2);
}
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
optimizer_literal_class_info(
info,
opline->op1_type,
opline->op1,
opline->op2.constant,
LITERAL_STATIC_METHOD, (ZEND_OP1_TYPE(opline) == IS_CONST) ? 1 : 2, 2,
op_array);
}
break;
case ZEND_CATCH:
LITERAL_INFO(opline->op1.constant, LITERAL_CLASS, 1, 1, 2);
break;
case ZEND_FETCH_CONSTANT:
if (ZEND_OP1_TYPE(opline) == IS_UNUSED) {
if ((opline->extended_value & (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) == (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) {
LITERAL_INFO(opline->op2.constant, LITERAL_CONST, 1, 1, 5);
} else {
LITERAL_INFO(opline->op2.constant, LITERAL_CONST, 1, 1, 3);
}
} else {
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op1.constant, LITERAL_CLASS, 1, 1, 2);
}
optimizer_literal_class_info(
info,
opline->op1_type,
opline->op1,
opline->op2.constant,
LITERAL_CLASS_CONST, (ZEND_OP1_TYPE(opline) == IS_CONST) ? 1 : 2, 1,
op_array);
}
break;
case ZEND_FETCH_R:
case ZEND_FETCH_W:
case ZEND_FETCH_RW:
case ZEND_FETCH_IS:
case ZEND_FETCH_UNSET:
case ZEND_FETCH_FUNC_ARG:
case ZEND_UNSET_VAR:
case ZEND_ISSET_ISEMPTY_VAR:
if (ZEND_OP2_TYPE(opline) == IS_UNUSED) {
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op1.constant, LITERAL_VALUE, 1, 0, 1);
}
} else {
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op2.constant, LITERAL_CLASS, 1, 1, 2);
}
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
optimizer_literal_class_info(
info,
opline->op2_type,
opline->op2,
opline->op1.constant,
LITERAL_STATIC_PROPERTY, 2, 1,
op_array);
}
}
break;
case ZEND_FETCH_CLASS:
case ZEND_ADD_INTERFACE:
case ZEND_ADD_TRAIT:
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op2.constant, LITERAL_CLASS, 1, 1, 2);
}
break;
case ZEND_ASSIGN_OBJ:
case ZEND_FETCH_OBJ_R:
case ZEND_FETCH_OBJ_W:
case ZEND_FETCH_OBJ_RW:
case ZEND_FETCH_OBJ_IS:
case ZEND_FETCH_OBJ_UNSET:
case ZEND_FETCH_OBJ_FUNC_ARG:
case ZEND_UNSET_OBJ:
case ZEND_PRE_INC_OBJ:
case ZEND_PRE_DEC_OBJ:
case ZEND_POST_INC_OBJ:
case ZEND_POST_DEC_OBJ:
case ZEND_ISSET_ISEMPTY_PROP_OBJ:
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
optimizer_literal_obj_info(
info,
opline->op1_type,
opline->op1,
opline->op2.constant,
LITERAL_PROPERTY, 2, 1,
op_array);
}
break;
case ZEND_ASSIGN_ADD:
case ZEND_ASSIGN_SUB:
case ZEND_ASSIGN_MUL:
case ZEND_ASSIGN_DIV:
case ZEND_ASSIGN_MOD:
case ZEND_ASSIGN_SL:
case ZEND_ASSIGN_SR:
case ZEND_ASSIGN_CONCAT:
case ZEND_ASSIGN_BW_OR:
case ZEND_ASSIGN_BW_AND:
case ZEND_ASSIGN_BW_XOR:
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
if (opline->extended_value == ZEND_ASSIGN_OBJ) {
optimizer_literal_obj_info(
info,
opline->op1_type,
opline->op1,
opline->op2.constant,
LITERAL_PROPERTY, 2, 1,
op_array);
} else {
LITERAL_INFO(opline->op2.constant, LITERAL_VALUE, 1, 0, 1);
}
}
break;
default:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op1.constant, LITERAL_VALUE, 1, 0, 1);
}
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
LITERAL_INFO(opline->op2.constant, LITERAL_VALUE, 1, 0, 1);
}
break;
}
opline++;
}
#if DEBUG_COMPACT_LITERALS
{
int i, use_copy;
fprintf(stderr, "File %s func %s\n", op_array->filename,
op_array->function_name? op_array->function_name : "main");
fprintf(stderr, "Literlas table size %d\n", op_array->last_literal);
for (i = 0; i < op_array->last_literal; i++) {
zval zv = op_array->literals[i].constant;
zend_make_printable_zval(&op_array->literals[i].constant, &zv, &use_copy);
fprintf(stderr, "Literal %d, val (%d):%s\n", i, Z_STRLEN(zv), Z_STRVAL(zv));
if (use_copy) {
zval_dtor(&zv);
}
}
fflush(stderr);
}
#endif
/* Merge equal constants */
j = 0; cache_slots = 0;
zend_hash_init(&hash, 16, NULL, NULL, 0);
map = (int*)zend_arena_alloc(&ctx->arena, op_array->last_literal * sizeof(int));
//???A
memset(map, 0, op_array->last_literal * sizeof(int));
for (i = 0; i < op_array->last_literal; i++) {
if (!info[i].flags) {
/* unsed literal */
zval_dtor(&op_array->literals[i]);
continue;
}
switch (Z_TYPE(op_array->literals[i])) {
case IS_NULL:
if (l_null < 0) {
l_null = j;
if (i != j) {
op_array->literals[j] = op_array->literals[i];
info[j] = info[i];
}
j++;
}
map[i] = l_null;
break;
case IS_FALSE:
if (l_false < 0) {
l_false = j;
if (i != j) {
op_array->literals[j] = op_array->literals[i];
info[j] = info[i];
}
j++;
}
map[i] = l_false;
break;
case IS_TRUE:
if (l_true < 0) {
l_true = j;
if (i != j) {
op_array->literals[j] = op_array->literals[i];
info[j] = info[i];
}
j++;
}
map[i] = l_true;
break;
case IS_LONG:
if ((pos = zend_hash_index_find(&hash, Z_LVAL(op_array->literals[i]))) != NULL) {
map[i] = Z_LVAL_P(pos);
} else {
map[i] = j;
ZVAL_LONG(&zv, j);
zend_hash_index_update(&hash, Z_LVAL(op_array->literals[i]), &zv);
if (i != j) {
op_array->literals[j] = op_array->literals[i];
info[j] = info[i];
}
j++;
}
break;
case IS_DOUBLE:
if ((pos = zend_hash_str_find(&hash, (char*)&Z_DVAL(op_array->literals[i]), sizeof(double))) != NULL) {
map[i] = Z_LVAL_P(pos);
} else {
map[i] = j;
ZVAL_LONG(&zv, j);
zend_hash_str_add(&hash, (char*)&Z_DVAL(op_array->literals[i]), sizeof(double), &zv);
if (i != j) {
op_array->literals[j] = op_array->literals[i];
info[j] = info[i];
}
j++;
}
break;
case IS_STRING:
case IS_CONSTANT:
if (info[i].flags & LITERAL_MAY_MERGE) {
if (info[i].flags & LITERAL_EX_OBJ) {
int key_len = MAX_LENGTH_OF_LONG + sizeof("->") + Z_STRLEN(op_array->literals[i]);
key = STR_ALLOC(key_len, 0);
key->len = snprintf(key->val, key->len-1, "%d->%s", info[i].u.num, Z_STRVAL(op_array->literals[i]));
} else if (info[i].flags & LITERAL_EX_CLASS) {
int key_len;
zval *class_name = &op_array->literals[(info[i].u.num < i) ? map[info[i].u.num] : info[i].u.num];
key_len = Z_STRLEN_P(class_name) + sizeof("::") + Z_STRLEN(op_array->literals[i]);
key = STR_ALLOC(key_len, 0);
memcpy(key->val, Z_STRVAL_P(class_name), Z_STRLEN_P(class_name));
memcpy(key->val + Z_STRLEN_P(class_name), "::", sizeof("::") - 1);
memcpy(key->val + Z_STRLEN_P(class_name) + sizeof("::") - 1,
Z_STRVAL(op_array->literals[i]),
Z_STRLEN(op_array->literals[i]) + 1);
} else {
key = STR_INIT(Z_STRVAL(op_array->literals[i]), Z_STRLEN(op_array->literals[i]), 0);
}
key->h = zend_hash_func(key->val, key->len);
key->h += info[i].flags;
}
if ((info[i].flags & LITERAL_MAY_MERGE) &&
(pos = zend_hash_find(&hash, key)) != NULL &&
Z_TYPE(op_array->literals[i]) == Z_TYPE(op_array->literals[Z_LVAL_P(pos)]) &&
info[i].flags == info[Z_LVAL_P(pos)].flags) {
STR_RELEASE(key);
map[i] = Z_LVAL_P(pos);
zval_dtor(&op_array->literals[i]);
n = LITERAL_NUM_RELATED(info[i].flags);
while (n > 1) {
i++;
zval_dtor(&op_array->literals[i]);
n--;
}
} else {
map[i] = j;
if (info[i].flags & LITERAL_MAY_MERGE) {
ZVAL_LONG(&zv, j);
zend_hash_add(&hash, key, &zv);
STR_RELEASE(key);
}
if (i != j) {
op_array->literals[j] = op_array->literals[i];
info[j] = info[i];
}
if (LITERAL_NUM_SLOTS(info[i].flags)) {
Z_CACHE_SLOT(op_array->literals[j]) = cache_slots;
cache_slots += LITERAL_NUM_SLOTS(info[i].flags);
}
j++;
n = LITERAL_NUM_RELATED(info[i].flags);
while (n > 1) {
i++;
if (i != j) op_array->literals[j] = op_array->literals[i];
j++;
n--;
}
}
break;
default:
/* don't merge other types */
map[i] = j;
if (i != j) {
op_array->literals[j] = op_array->literals[i];
info[j] = info[i];
}
j++;
break;
}
}
zend_hash_destroy(&hash);
op_array->last_literal = j;
op_array->last_cache_slot = cache_slots;
/* Update opcodes to use new literals table */
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
opline->op1.constant = map[opline->op1.constant];
}
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
opline->op2.constant = map[opline->op2.constant];
}
opline++;
}
zend_arena_release(&ctx->arena, checkpoint);
#if DEBUG_COMPACT_LITERALS
{
int i, use_copy;
fprintf(stderr, "Optimized literlas table size %d\n", op_array->last_literal);
for (i = 0; i < op_array->last_literal; i++) {
zval zv = op_array->literals[i].constant;
zend_make_printable_zval(&op_array->literals[i].constant, &zv, &use_copy);
fprintf(stderr, "Literal %d, val (%d):%s\n", i, Z_STRLEN(zv), Z_STRVAL(zv));
if (use_copy) {
zval_dtor(&zv);
}
}
fflush(stderr);
}
#endif
}
}
#endif
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