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PoC: Make type checking constant time (for fast generics & DNF matching) #18189

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155350d
initial type tree implementation
withinboredom Mar 27, 2025
ca49037
fix jit
withinboredom Mar 27, 2025
6fd6134
try to make faster
withinboredom Mar 28, 2025
8310a4f
remove unused function
withinboredom Mar 28, 2025
ff1edb2
fix issue
withinboredom Mar 28, 2025
ff7ab1f
fix bad rebase
withinboredom Mar 28, 2025
024a272
move some stuff around and clean up memory on shutdown
withinboredom Mar 28, 2025
fe66269
fix a potential infinite loop
withinboredom Mar 28, 2025
2336f11
compare names case-insensitive
withinboredom Mar 28, 2025
77d03e9
fix a declaration
withinboredom Mar 28, 2025
ed7d7fa
set to null
withinboredom Mar 28, 2025
83c7ed6
fix memory leak
withinboredom Mar 28, 2025
13e3ede
move to EG and CG
withinboredom Mar 28, 2025
c2d9948
enhance
withinboredom Mar 28, 2025
e630682
handle void
withinboredom Mar 28, 2025
4a85778
make sure we destroy the hash
withinboredom Mar 28, 2025
43a2f69
take ownership of the type
withinboredom Mar 29, 2025
8214a9f
move to only when we are creating new types to be interned
withinboredom Mar 29, 2025
d1ca6c2
only release the string if it is not interned
withinboredom Mar 29, 2025
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1 change: 1 addition & 0 deletions Zend/zend.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1195,6 +1195,7 @@ void zend_shutdown(void) /* {{{ */
free(GLOBAL_CONSTANTS_TABLE);
zend_shutdown_strtod();
zend_attributes_shutdown();
zend_type_free_interned_trees();

#ifdef ZTS
GLOBAL_FUNCTION_TABLE = NULL;
Expand Down
249 changes: 246 additions & 3 deletions Zend/zend_API.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2898,7 +2898,246 @@ ZEND_API void zend_add_magic_method(zend_class_entry *ce, zend_function *fptr, z
ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arg_info_toString, 0, 0, IS_STRING, 0)
ZEND_END_ARG_INFO()

static zend_always_inline void zend_normalize_internal_type(zend_type *type) {
ZEND_API void zend_type_free_interned_trees(void) {
zend_type_node *tree = NULL;
ZEND_HASH_FOREACH_PTR(CG(type_trees), tree) {
if (tree->kind != ZEND_TYPE_SIMPLE) {
pefree(tree->compound.types, 1);
} else {
if (ZEND_TYPE_HAS_NAME(tree->simple_type)) {
if (!ZSTR_IS_INTERNED(ZEND_TYPE_NAME(tree->simple_type))) {
zend_string_release_ex(ZEND_TYPE_NAME(tree->simple_type), 1);
}
}
}
pefree(tree, 1);
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(CG(type_trees));
pefree(CG(type_trees), 1);
CG(type_trees) = NULL;
}

static int compare_simple_types(const zend_type a, const zend_type b) {
const uint32_t a_mask = ZEND_TYPE_FULL_MASK(a);
const uint32_t b_mask = ZEND_TYPE_FULL_MASK(b);

if (a_mask != b_mask) {
return a_mask < b_mask ? -1 : 1;
}

const bool a_has_name = ZEND_TYPE_HAS_NAME(a);
const bool b_has_name = ZEND_TYPE_HAS_NAME(b);

if (a_has_name && b_has_name) {
const zend_string *a_name = ZEND_TYPE_NAME(a);
const zend_string *b_name = ZEND_TYPE_NAME(b);
const int cmp = ZSTR_VAL(a_name) - ZSTR_VAL(b_name);
if (cmp != 0) {
return cmp;
}
}

const bool a_nullable = ZEND_TYPE_ALLOW_NULL(a);
const bool b_nullable = ZEND_TYPE_ALLOW_NULL(b);

if (a_nullable != b_nullable) {
return a_nullable ? 1 : -1;
}

// Types are equal
return 0;
}

static int compare_type_nodes(const void *a_, const void *b_) {
const zend_type_node *a = *(zend_type_node **)a_;
const zend_type_node *b = *(zend_type_node **)b_;

if (a->kind != b->kind) {
return (int)a->kind - (int)b->kind;
}

if (a->kind == ZEND_TYPE_SIMPLE) {
return compare_simple_types(a->simple_type, b->simple_type);
}

if (a->compound.num_types != b->compound.num_types) {
return (int)a->compound.num_types - (int)b->compound.num_types;
}

for (uint32_t i = 0; i < a->compound.num_types; i++) {
const int cmp = compare_type_nodes(&a->compound.types[i], &b->compound.types[i]);
if (cmp != 0) {
return cmp;
}
}

return 0;
}

zend_ulong zend_type_node_hash(const zend_type_node *node) {
zend_ulong hash = 2166136261u; // FNV-1a offset basis

hash ^= (zend_ulong)node->kind;
hash *= 16777619;

switch (node->kind) {
case ZEND_TYPE_SIMPLE: {
const zend_type type = node->simple_type;
hash ^= (zend_ulong)ZEND_TYPE_FULL_MASK(type);
hash *= 16777619;

if (ZEND_TYPE_HAS_NAME(type)) {
zend_string *name = ZEND_TYPE_NAME(type);
hash ^= zend_string_hash_val(name);
hash *= 16777619;
}

break;
}

case ZEND_TYPE_UNION:
case ZEND_TYPE_INTERSECTION: {
for (uint32_t i = 0; i < node->compound.num_types; ++i) {
const zend_ulong child_hash = zend_type_node_hash(node->compound.types[i]);
hash ^= child_hash;
hash *= 16777619;
}
break;
}
}

return hash;
}

bool zend_type_node_equals(const zend_type_node *a, const zend_type_node *b) {
if (a == b) return true;
if (a->kind != b->kind) return false;

if (a->kind == ZEND_TYPE_SIMPLE) {
const zend_type at = a->simple_type;
const zend_type bt = b->simple_type;

if (ZEND_TYPE_FULL_MASK(at) != ZEND_TYPE_FULL_MASK(bt)) {
return false;
}

const bool a_has_name = ZEND_TYPE_HAS_NAME(at);
const bool b_has_name = ZEND_TYPE_HAS_NAME(bt);
if (a_has_name != b_has_name) {
return false;
}

if (a_has_name) {
const zend_string *a_name = ZEND_TYPE_NAME(at);
const zend_string *b_name = ZEND_TYPE_NAME(bt);
if (!zend_string_equals_ci(a_name, b_name)) {
return false;
}
}

return true;
}

// Compound type: union or intersection
if (a->compound.num_types != b->compound.num_types) {
return false;
}

for (uint32_t i = 0; i < a->compound.num_types; ++i) {
if (!zend_type_node_equals(a->compound.types[i], b->compound.types[i])) {
return false;
}
}

return true;
}

static zend_type_node *intern_type_node(zend_type_node *node) {
const zend_ulong hash = zend_type_node_hash(node);
zend_type_node *existing;

if (CG(type_trees) == NULL) {
CG(type_trees) = pemalloc(sizeof(HashTable), 1);
zend_hash_init(CG(type_trees), 64, NULL, NULL, 1);
}

if ((existing = zend_hash_index_find_ptr(CG(type_trees), hash))) {
if (zend_type_node_equals(existing, node)) {
if (node->kind != ZEND_TYPE_SIMPLE) {
pefree(node->compound.types, 1);
}
pefree(node, 1);
return existing; // reuse interned node
}
}

if (node->kind == ZEND_TYPE_SIMPLE) {
if (ZEND_TYPE_HAS_NAME(node->simple_type)) {
const zend_string *name = ZEND_TYPE_NAME(node->simple_type);
zend_string *new_name = zend_string_init_interned(ZSTR_VAL(name), ZSTR_LEN(name), 1);
ZEND_TYPE_SET_PTR(node->simple_type, new_name);
}
}

zend_hash_index_add_new_ptr(CG(type_trees), hash, node);
return node;
}

ZEND_API zend_type_node *zend_type_to_interned_tree(const zend_type type) {
if (type.type_mask == 0) {
return NULL;
}

if (!ZEND_TYPE_HAS_LIST(type)) {
zend_type_node *node = pemalloc(sizeof(zend_type_node), 1);
node->kind = ZEND_TYPE_SIMPLE;
node->simple_type = type;
return intern_type_node(node);
}

zend_type_list *list = ZEND_TYPE_LIST(type);
const zend_type_node_kind kind = ZEND_TYPE_IS_INTERSECTION(type) ?
ZEND_TYPE_INTERSECTION : ZEND_TYPE_UNION;

zend_type_node **children = NULL;
uint32_t num_children = 0;

zend_type *subtype;

children = pemalloc(list->num_types * sizeof(zend_type_node *), 1);

ZEND_TYPE_LIST_FOREACH(list, subtype) {
zend_type_node *child = zend_type_to_interned_tree(*subtype);

if (child->kind == kind) {
for (uint32_t i = 0; i < child->compound.num_types; i++) {
children[num_children++] = child->compound.types[i];
}
} else {
children[num_children++] = child;
}
} ZEND_TYPE_LIST_FOREACH_END();

qsort(children, num_children, sizeof(zend_type_node*), compare_type_nodes);

size_t deduped_count = 0;
for (size_t i = 0; i < num_children; i++) {
if (i == 0 || children[i] != children[i - 1]) {
children[deduped_count++] = children[i];
}
}

zend_type_node *node = pemalloc(sizeof(zend_type_node), 1);
node->kind = kind;
node->compound.num_types = deduped_count;
node->compound.types = pemalloc(sizeof(zend_type_node *) * deduped_count, 1);
memcpy(node->compound.types, children, sizeof(zend_type_node *) * deduped_count);
pefree(children, 1);

return intern_type_node(node);
}

static zend_always_inline zend_type_node *zend_normalize_internal_type(zend_type *type) {
ZEND_ASSERT(!ZEND_TYPE_HAS_LITERAL_NAME(*type));
if (ZEND_TYPE_PURE_MASK(*type) != MAY_BE_ANY) {
ZEND_ASSERT(!ZEND_TYPE_CONTAINS_CODE(*type, IS_RESOURCE) && "resource is not allowed in a zend_type");
Expand All @@ -2921,6 +3160,8 @@ static zend_always_inline void zend_normalize_internal_type(zend_type *type) {
} ZEND_TYPE_FOREACH_END();
}
} ZEND_TYPE_FOREACH_END();

return zend_type_to_interned_tree(*type);
}

/* registers all functions in *library_functions in the function hash */
Expand Down Expand Up @@ -3190,7 +3431,7 @@ ZEND_API zend_result zend_register_functions(zend_class_entry *scope, const zend
new_arg_info[i].type = legacy_iterable;
}

zend_normalize_internal_type(&new_arg_info[i].type);
new_arg_info[i].type_tree = zend_normalize_internal_type(&new_arg_info[i].type);
}
}

Expand Down Expand Up @@ -4665,7 +4906,9 @@ ZEND_API zend_property_info *zend_declare_typed_property(zend_class_entry *ce, z
property_info->type = type;

if (is_persistent_class(ce)) {
zend_normalize_internal_type(&property_info->type);
property_info->type_tree = zend_normalize_internal_type(&property_info->type);
} else {
property_info->type_tree = zend_type_to_interned_tree(property_info->type);
}

zend_hash_update_ptr(&ce->properties_info, name, property_info);
Expand Down
41 changes: 22 additions & 19 deletions Zend/zend_API.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -128,46 +128,46 @@ typedef struct _zend_fcall_info_cache {

/* Arginfo structures without type information */
#define ZEND_ARG_INFO(pass_by_ref, name) \
{ #name, ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL },
{ #name, ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, NULL },
#define ZEND_ARG_INFO_WITH_DEFAULT_VALUE(pass_by_ref, name, default_value) \
{ #name, ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), default_value },
{ #name, ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, default_value },
#define ZEND_ARG_VARIADIC_INFO(pass_by_ref, name) \
{ #name, ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL },
{ #name, ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL, NULL },

/* Arginfo structures with simple type information */
#define ZEND_ARG_TYPE_INFO(pass_by_ref, name, type_hint, allow_null) \
{ #name, ZEND_TYPE_INIT_CODE(type_hint, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL },
{ #name, ZEND_TYPE_INIT_CODE(type_hint, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, NULL },
#define ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(pass_by_ref, name, type_hint, allow_null, default_value) \
{ #name, ZEND_TYPE_INIT_CODE(type_hint, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), default_value },
{ #name, ZEND_TYPE_INIT_CODE(type_hint, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, default_value },
#define ZEND_ARG_VARIADIC_TYPE_INFO(pass_by_ref, name, type_hint, allow_null) \
{ #name, ZEND_TYPE_INIT_CODE(type_hint, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL },
{ #name, ZEND_TYPE_INIT_CODE(type_hint, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL, NULL },

/* Arginfo structures with complex type information */
#define ZEND_ARG_TYPE_MASK(pass_by_ref, name, type_mask, default_value) \
{ #name, ZEND_TYPE_INIT_MASK(type_mask | _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), default_value },
{ #name, ZEND_TYPE_INIT_MASK(type_mask | _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, default_value },
#define ZEND_ARG_OBJ_TYPE_MASK(pass_by_ref, name, class_name, type_mask, default_value) \
{ #name, ZEND_TYPE_INIT_CLASS_CONST_MASK(#class_name, type_mask | _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), default_value },
{ #name, ZEND_TYPE_INIT_CLASS_CONST_MASK(#class_name, type_mask | _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, default_value },
#define ZEND_ARG_VARIADIC_OBJ_TYPE_MASK(pass_by_ref, name, class_name, type_mask) \
{ #name, ZEND_TYPE_INIT_CLASS_CONST_MASK(#class_name, type_mask | _ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL },
{ #name, ZEND_TYPE_INIT_CLASS_CONST_MASK(#class_name, type_mask | _ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL, NULL },

/* Arginfo structures with object type information */
#define ZEND_ARG_OBJ_INFO(pass_by_ref, name, class_name, allow_null) \
{ #name, ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL },
{ #name, ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, NULL },
#define ZEND_ARG_OBJ_INFO_WITH_DEFAULT_VALUE(pass_by_ref, name, class_name, allow_null, default_value) \
{ #name, ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), default_value },
{ #name, ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, default_value },
#define ZEND_ARG_VARIADIC_OBJ_INFO(pass_by_ref, name, class_name, allow_null) \
{ #name, ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL },
{ #name, ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 1, 0)), NULL, NULL },

/* Legacy arginfo structures */
#define ZEND_ARG_ARRAY_INFO(pass_by_ref, name, allow_null) \
{ #name, ZEND_TYPE_INIT_CODE(IS_ARRAY, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL },
{ #name, ZEND_TYPE_INIT_CODE(IS_ARRAY, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, NULL },
#define ZEND_ARG_CALLABLE_INFO(pass_by_ref, name, allow_null) \
{ #name, ZEND_TYPE_INIT_CODE(IS_CALLABLE, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL },
{ #name, ZEND_TYPE_INIT_CODE(IS_CALLABLE, allow_null, _ZEND_ARG_INFO_FLAGS(pass_by_ref, 0, 0)), NULL, NULL },

#define ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX2(name, return_reference, required_num_args, class_name, allow_null, is_tentative_return_type) \
static const zend_internal_arg_info name[] = { \
{ (const char*)(uintptr_t)(required_num_args), \
ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL },
ZEND_TYPE_INIT_CLASS_CONST(#class_name, allow_null, _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL, NULL },

#define ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(name, return_reference, required_num_args, class_name, allow_null) \
ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX2(name, return_reference, required_num_args, class_name, allow_null, 0)
Expand All @@ -180,7 +180,7 @@ typedef struct _zend_fcall_info_cache {

#define ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX2(name, return_reference, required_num_args, type, is_tentative_return_type) \
static const zend_internal_arg_info name[] = { \
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_MASK(type | _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL },
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_MASK(type | _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL, NULL },

#define ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(name, return_reference, required_num_args, type) \
ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX2(name, return_reference, required_num_args, type, 0)
Expand All @@ -190,7 +190,7 @@ typedef struct _zend_fcall_info_cache {

#define ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX2(name, return_reference, required_num_args, class_name, type, is_tentative_return_type) \
static const zend_internal_arg_info name[] = { \
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_CLASS_CONST_MASK(#class_name, type | _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL },
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_CLASS_CONST_MASK(#class_name, type | _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL, NULL },

#define ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(name, return_reference, required_num_args, class_name, type) \
ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX2(name, return_reference, required_num_args, class_name, type, 0)
Expand All @@ -200,7 +200,7 @@ typedef struct _zend_fcall_info_cache {

#define ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX2(name, return_reference, required_num_args, type, allow_null, is_tentative_return_type) \
static const zend_internal_arg_info name[] = { \
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_CODE(type, allow_null, _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL },
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_CODE(type, allow_null, _ZEND_ARG_INFO_FLAGS(return_reference, 0, is_tentative_return_type)), NULL, NULL },

#define ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(name, return_reference, required_num_args, type, allow_null) \
ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX2(name, return_reference, required_num_args, type, allow_null, 0)
Expand All @@ -213,7 +213,7 @@ typedef struct _zend_fcall_info_cache {

#define ZEND_BEGIN_ARG_INFO_EX(name, _unused, return_reference, required_num_args) \
static const zend_internal_arg_info name[] = { \
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(return_reference, 0, 0)), NULL },
{ (const char*)(uintptr_t)(required_num_args), ZEND_TYPE_INIT_NONE(_ZEND_ARG_INFO_FLAGS(return_reference, 0, 0)), NULL, NULL },
#define ZEND_BEGIN_ARG_INFO(name, _unused) \
ZEND_BEGIN_ARG_INFO_EX(name, {}, ZEND_RETURN_VALUE, -1)
#define ZEND_END_ARG_INFO() };
Expand Down Expand Up @@ -448,6 +448,9 @@ ZEND_API zend_result zend_update_class_constant(zend_class_constant *c, const ze
ZEND_API zend_result zend_update_class_constants(zend_class_entry *class_type);
ZEND_API HashTable *zend_separate_class_constants_table(zend_class_entry *class_type);

ZEND_API zend_type_node *zend_type_to_interned_tree(zend_type type);
ZEND_API void zend_type_free_interned_trees(void);

static zend_always_inline HashTable *zend_class_constants_table(zend_class_entry *ce) {
if ((ce->ce_flags & ZEND_ACC_HAS_AST_CONSTANTS) && ZEND_MAP_PTR(ce->mutable_data)) {
zend_class_mutable_data *mutable_data =
Expand Down
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