Persistent Descriptor Pool (#6899)

* Make reserve names map persistent

* Add DescriptorInternal to map

* Use get_msgdef_desc in encode_decode.c

* Add persistent map for ce=>def and enum=>def

* Replace get_ce_obj

* Remove get_proto_obj

* Remove obsolete fields from Descriptor and EnumDescriptor

* Add cache for descriptor php values

* Add cache for descriptors

* Fix bug

* Avoid add generated file again if it has been added

* Fix the bug upb depends on null-ended str for look up.

* Initialize generated pool impl

* Turn down old generated pool

* Add init entry flag protobuf.keep_descriptor_pool_after_request

By default, it's off. Add protobuf.keep_descriptor_pool_after_request=1 to php.ini to enable it

* Fix zts build

php/ext/google/protobuf/message.c

@@ -255,7 +255,7 @@ void* message_data(MessageHeader* msg) {
 
 void custom_data_init(const zend_class_entry* ce,
                       MessageHeader* intern PHP_PROTO_TSRMLS_DC) {
-  Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(ce));
+  DescriptorInternal* desc = get_ce_desc(ce);
   intern->data = ALLOC_N(uint8_t, desc->layout->size);
   // We wrap first so that everything in the message object is GC-rooted in
   // case a collection happens during object creation in layout_init().
@@ -279,15 +279,15 @@ void build_class_from_descriptor(
   Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, php_descriptor);
 
   // Map entries don't have existing php class.
-  if (upb_msgdef_mapentry(desc->msgdef)) {
+  if (upb_msgdef_mapentry(desc->intern->msgdef)) {
     return;
   }
 
-  zend_class_entry* registered_ce = desc->klass;
+  zend_class_entry* registered_ce = desc->intern->klass;
 
-  if (desc->layout == NULL) {
-    MessageLayout* layout = create_layout(desc->msgdef);
-    desc->layout = layout;
+  if (desc->intern->layout == NULL) {
+    MessageLayout* layout = create_layout(desc->intern->msgdef);
+    desc->intern->layout = layout;
   }
 
   registered_ce->create_object = message_create;
@@ -395,8 +395,7 @@ void Message_construct(zval* msg, zval* array_wrapper) {
         is_wrapper = is_wrapper_msg(submsgdef);
 
         if (is_wrapper) {
-          PHP_PROTO_HASHTABLE_VALUE subdesc_php = get_def_obj(submsgdef);
-          Descriptor* subdesc = UNBOX_HASHTABLE_VALUE(Descriptor, subdesc_php);
+          DescriptorInternal* subdesc = get_msgdef_desc(submsgdef);
           subklass = subdesc->klass;
         }
       }
@@ -435,8 +434,7 @@ void Message_construct(zval* msg, zval* array_wrapper) {
         is_wrapper = is_wrapper_msg(submsgdef);
 
         if (is_wrapper) {
-          PHP_PROTO_HASHTABLE_VALUE subdesc_php = get_def_obj(submsgdef);
-          Descriptor* subdesc = UNBOX_HASHTABLE_VALUE(Descriptor, subdesc_php);
+          DescriptorInternal* subdesc = get_msgdef_desc(submsgdef);
           subklass = subdesc->klass;
         }
       }
@@ -459,8 +457,7 @@ void Message_construct(zval* msg, zval* array_wrapper) {
       }
     } else if (upb_fielddef_issubmsg(field)) {
       const upb_msgdef* submsgdef = upb_fielddef_msgsubdef(field);
-      PHP_PROTO_HASHTABLE_VALUE desc_php = get_def_obj(submsgdef);
-      Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, desc_php);
+      DescriptorInternal* desc = get_msgdef_desc(submsgdef);
 
       CACHED_VALUE* cached = NULL;
       if (upb_fielddef_containingoneof(field)) {
@@ -530,7 +527,7 @@ PHP_METHOD(Message, __construct) {
 
 PHP_METHOD(Message, clear) {
   MessageHeader* msg = UNBOX(MessageHeader, getThis());
-  Descriptor* desc = msg->descriptor;
+  DescriptorInternal* desc = msg->descriptor;
   zend_class_entry* ce = desc->klass;
 
   zend_object_std_dtor(&msg->std TSRMLS_CC);
@@ -1536,14 +1533,13 @@ PHP_METHOD(Any, unpack) {
   }
 
   const char* fully_qualified_name = type_url + url_prefix_len;
-  PHP_PROTO_HASHTABLE_VALUE desc_php = get_proto_obj(fully_qualified_name);
-  if (desc_php == NULL) {
+  DescriptorInternal* desc = get_proto_desc(fully_qualified_name);
+  if (desc == NULL) {
     zend_throw_exception(
         NULL, "Specified message in any hasn't been added to descriptor pool",
         0 TSRMLS_CC);
     return;
   }
-  Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, desc_php);
   zend_class_entry* klass = desc->klass;
   ZVAL_OBJ(return_value, klass->create_object(klass TSRMLS_CC));
   MessageHeader* msg = UNBOX(MessageHeader, return_value);
@@ -1589,8 +1585,7 @@ PHP_METHOD(Any, pack) {
   PHP_PROTO_FAKE_SCOPE_END;
 
   // Set type url.
-  Descriptor* desc =
-      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(Z_OBJCE_P(val)));
+  DescriptorInternal* desc = get_ce_desc(Z_OBJCE_P(val));
   const char* fully_qualified_name = upb_msgdef_fullname(desc->msgdef);
   size_t type_url_len =
       strlen(TYPE_URL_PREFIX) + strlen(fully_qualified_name) + 1;
@@ -1617,14 +1612,12 @@ PHP_METHOD(Any, is) {
     return;
   }
 
-  PHP_PROTO_HASHTABLE_VALUE desc_php = get_ce_obj(klass);
-  if (desc_php == NULL) {
+  DescriptorInternal* desc = get_ce_desc(klass);
+  if (desc == NULL) {
     RETURN_BOOL(false);
   }
 
   // Create corresponded type url.
-  Descriptor* desc =
-      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(klass));
   const char* fully_qualified_name = upb_msgdef_fullname(desc->msgdef);
   size_t type_url_len =
       strlen(TYPE_URL_PREFIX) + strlen(fully_qualified_name) + 1;