Immutable clases and op_arrays.

Squashed commit of the following:

commit cd0c36c3f943849e5b97a8dbe2dd029fbeab3df9
Merge: 4740dabb84 ad6738e886
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 14:43:38 2018 +0300

    Merge branch 'master' into immutable

    * master:
      Remove the "auto" encoding
      Fixed bug #77025
      Add vtbls for EUC-TW encoding

commit 4740dabb843c6d4f7f866b4a2456073c9eaf4c77
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 14:12:28 2018 +0300

    Reverted back ce->iterator_funcs_ptr. Initialize ce->iterator_funcs_ptr fields in immutable classes.

commit ad7a78b253be970db70c2251e66f9297d8e7f829
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:46:30 2018 +0300

    Added comment

commit 0276ea51875bab37be01a4dc5e5a047c5698c571
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:42:43 2018 +0300

    Added type cast

commit c63fc5d5f19c58498108d1698055b2b442227eb3
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:36:51 2018 +0300

    Moved static class members initialization into the proper place.

commit b945548e9306b1826c881918858b5e5aa3eb3002
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:21:03 2018 +0300

    Removed redundand assertion

commit d5a41088401814c829847db212488f8aae39bcd2
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:19:13 2018 +0300

    Removed duplicate code

commit 8dadca8864e66de70a24bdf1181bcf7dd8fb27d7
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:05:43 2018 +0300

    Hide offset encoding magic in ZEND_MAP_PTR_IS_OFFSET(), ZEND_MAP_PTR_OFFSET2PTR() and ZEND_MAP_PTR_PTR2OFFSET() macros.

commit 9ef07c88bd76801e2d4fbfeab3ebfd6e6a67ac5f
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 10:48:29 2018 +0300

    typo

commit a06f0f3d3aba53e766046221ee44fb9720389ecc
Merge: 94099586ec 3412345ffe
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 10:47:07 2018 +0300

    Merge branch 'master' into immutable

    * master:
      Remove unused variable makefile_am_files
      Classify object handlers are required/optional
      Add support for getting SKIP_TAGSTART and SKIP_WHITE options
      Remove some obsolete config_vars.mk occurrences
      Remove bsd_converted from .gitignore
      Remove configuration parser and scanners ignores
      Remove obsolete buildconf.stamp from .gitignore
      [ci skip] Add magicdata.patch exception to .gitignore
      Remove outdated ext/spl/examples items from .gitignore
      Remove unused test.inc in ext/iconv/tests

commit 94099586ec599117581ca01c15b1f6c5f749e23a
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Mon Oct 15 23:34:01 2018 +0300

    Immutable clases and op_arrays

1 files changed, 31 insertions, 16 deletions

diff --git a/Zend/zend_opcode.c b/Zend/zend_opcode.c
index f348b0b589..9d974620ac 100644
--- a/Zend/zend_opcode.c
+++ b/Zend/zend_opcode.c
@@ -76,6 +76,7 @@ void init_op_array(zend_op_array *op_array, zend_uchar type, int initial_ops_siz
 	op_array->last_live_range = 0;
 
 	op_array->static_variables = NULL;
+	ZEND_MAP_PTR_INIT(op_array->static_variables_ptr, &op_array->static_variables);
 	op_array->last_try_catch = 0;
 
 	op_array->fn_flags = 0;
@@ -83,8 +84,8 @@ void init_op_array(zend_op_array *op_array, zend_uchar type, int initial_ops_siz
 	op_array->last_literal = 0;
 	op_array->literals = NULL;
 
-	op_array->run_time_cache = NULL;
-	op_array->cache_size = 0;
+	ZEND_MAP_PTR_INIT(op_array->run_time_cache, NULL);
+	op_array->cache_size = zend_op_array_extension_handles * sizeof(void*);
 
 	memset(op_array->reserved, 0, ZEND_MAX_RESERVED_RESOURCES * sizeof(void*));
 
@@ -145,11 +146,7 @@ ZEND_API void zend_cleanup_internal_class_data(zend_class_entry *ce)
 		zval *p = static_members;
 		zval *end = p + ce->default_static_members_count;
 
-#ifdef ZTS
-		CG(static_members_table)[ce->static_members_table_idx] = NULL;
-#else
-		ce->static_members_table = NULL;
-#endif
+		ZEND_MAP_PTR_SET(ce->static_members_table, NULL);
 		while (p != end) {
 			i_zval_ptr_dtor(p);
 			p++;
@@ -213,7 +210,21 @@ ZEND_API void destroy_zend_class(zval *zv)
 	zend_class_entry *ce = Z_PTR_P(zv);
 	zend_function *fn;
 
-	if (--ce->refcount > 0) {
+	if (ce->ce_flags & ZEND_ACC_IMMUTABLE) {
+		zend_op_array *op_array;
+
+		if (ce->default_static_members_count) {
+			zend_cleanup_internal_class_data(ce);
+		}
+		if (ce->ce_flags & ZEND_HAS_STATIC_IN_METHODS) {
+			ZEND_HASH_FOREACH_PTR(&ce->function_table, op_array) {
+				if (op_array->type == ZEND_USER_FUNCTION) {
+					destroy_op_array(op_array);
+				}
+			} ZEND_HASH_FOREACH_END();
+		}
+		return;
+	} else if (--ce->refcount > 0) {
 		return;
 	}
 	switch (ce->type) {
@@ -305,6 +316,9 @@ ZEND_API void destroy_zend_class(zval *zv)
 					p++;
 				}
 				free(ce->default_static_members_table);
+				if (ZEND_MAP_PTR(ce->static_members_table) != &ce->default_static_members_table) {
+					zend_cleanup_internal_class_data(ce);
+				}
 			}
 			zend_hash_destroy(&ce->properties_info);
 			zend_string_release_ex(ce->name, 1);
@@ -355,17 +369,18 @@ ZEND_API void destroy_op_array(zend_op_array *op_array)
 {
 	uint32_t i;
 
-	if (op_array->static_variables &&
-	    !(GC_FLAGS(op_array->static_variables) & IS_ARRAY_IMMUTABLE)) {
-		if (GC_DELREF(op_array->static_variables) == 0) {
-			zend_array_destroy(op_array->static_variables);
+	if (op_array->static_variables) {
+		HashTable *ht = ZEND_MAP_PTR_GET(op_array->static_variables_ptr);
+		if (ht && !(GC_FLAGS(ht) & IS_ARRAY_IMMUTABLE)) {
+			if (GC_DELREF(ht) == 0) {
+				zend_array_destroy(ht);
+			}
 		}
 	}
 
-	if (op_array->run_time_cache
-	 && (op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE)) {
-		efree(op_array->run_time_cache);
-		op_array->run_time_cache = NULL;
+	if ((op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE)
+	 && ZEND_MAP_PTR(op_array->run_time_cache)) {
+		efree(ZEND_MAP_PTR(op_array->run_time_cache));
 	}
 
 	if (!op_array->refcount || --(*op_array->refcount) > 0) {