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      Remove outdated ext/spl/examples items from .gitignore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, 26 insertions, 45 deletions

diff --git a/Zend/zend_execute.c b/Zend/zend_execute.c
index 66ff7abfcd..6cf75d0926 100644
--- a/Zend/zend_execute.c
+++ b/Zend/zend_execute.c
@@ -2407,39 +2407,20 @@ static zend_always_inline void i_init_func_execute_data(zend_op_array *op_array,
 }
 /* }}} */
 
-static zend_never_inline void ZEND_FASTCALL init_func_run_time_cache(zend_op_array *op_array) /* {{{ */
+static zend_always_inline void init_func_run_time_cache_i(zend_op_array *op_array) /* {{{ */
 {
-	ZEND_ASSERT(op_array->run_time_cache == NULL);
-	op_array->run_time_cache = zend_arena_alloc(&CG(arena), op_array->cache_size);
-	memset(op_array->run_time_cache, 0, op_array->cache_size);
-}
-/* }}} */
+	void **run_time_cache;
 
-static zend_always_inline zend_function* ZEND_FASTCALL init_func_run_time_cache_i(zval *zv) /* {{{ */
-{
-	zend_op_array *op_array = Z_PTR_P(zv);
-
-	ZEND_ASSERT(op_array->run_time_cache == NULL);
-	if (op_array->fn_flags & ZEND_ACC_IMMUTABLE) {
-		zend_op_array *new_op_array = zend_arena_alloc(&CG(arena), sizeof(zend_op_array) + op_array->cache_size);
-
-		Z_PTR_P(zv) = new_op_array;
-		memcpy(new_op_array, op_array, sizeof(zend_op_array));
-		new_op_array->fn_flags &= ~ZEND_ACC_IMMUTABLE;
-		new_op_array->run_time_cache = (void**)(new_op_array + 1);
-		memset(new_op_array->run_time_cache, 0, new_op_array->cache_size);
-		return (zend_function*)new_op_array;
-	} else {
-		op_array->run_time_cache = zend_arena_alloc(&CG(arena), op_array->cache_size);
-		memset(op_array->run_time_cache, 0, op_array->cache_size);
-		return (zend_function*)op_array;
-	}
+	ZEND_ASSERT(RUN_TIME_CACHE(op_array) == NULL);
+	run_time_cache = zend_arena_alloc(&CG(arena), op_array->cache_size);
+	memset(run_time_cache, 0, op_array->cache_size);
+	ZEND_MAP_PTR_SET(op_array->run_time_cache, run_time_cache);
 }
 /* }}} */
 
-static zend_never_inline zend_function* init_func_run_time_cache_ex(zval *zv) /* {{{ */
+static zend_never_inline void ZEND_FASTCALL init_func_run_time_cache(zend_op_array *op_array) /* {{{ */
 {
-	return init_func_run_time_cache_i(zv);
+	init_func_run_time_cache_i(op_array);
 }
 /* }}} */
 
@@ -2450,8 +2431,8 @@ ZEND_API zend_function * ZEND_FASTCALL zend_fetch_function(zend_string *name) /*
 	if (EXPECTED(zv != NULL)) {
 		zend_function *fbc = Z_FUNC_P(zv);
 
-		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!fbc->op_array.run_time_cache)) {
-			fbc = (zend_function*)init_func_run_time_cache_i(zv);
+		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!RUN_TIME_CACHE(&fbc->op_array))) {
+			init_func_run_time_cache_i(&fbc->op_array);
 		}
 		return fbc;
 	}
@@ -2465,8 +2446,8 @@ ZEND_API zend_function * ZEND_FASTCALL zend_fetch_function_str(const char *name,
 	if (EXPECTED(zv != NULL)) {
 		zend_function *fbc = Z_FUNC_P(zv);
 
-		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!fbc->op_array.run_time_cache)) {
-			fbc = (zend_function*)init_func_run_time_cache_i(zv);
+		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!RUN_TIME_CACHE(&fbc->op_array))) {
+			init_func_run_time_cache_i(&fbc->op_array);
 		}
 		return fbc;
 	}
@@ -2483,10 +2464,15 @@ static zend_always_inline void i_init_code_execute_data(zend_execute_data *execu
 
 	zend_attach_symbol_table(execute_data);
 
-	if (!op_array->run_time_cache) {
+	if (!ZEND_MAP_PTR(op_array->run_time_cache)) {
+		void *ptr;
+
 		ZEND_ASSERT(op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE);
-		op_array->run_time_cache = emalloc(op_array->cache_size);
-		memset(op_array->run_time_cache, 0, op_array->cache_size);
+		ptr = emalloc(op_array->cache_size + sizeof(void*));
+		ZEND_MAP_PTR_INIT(op_array->run_time_cache, ptr);
+		ptr = (char*)ptr + sizeof(void*);
+		ZEND_MAP_PTR_SET(op_array->run_time_cache, ptr);
+		memset(ptr, 0, op_array->cache_size);
 	}
 	EX_LOAD_RUN_TIME_CACHE(op_array);
 
@@ -2505,7 +2491,7 @@ ZEND_API void zend_init_func_execute_data(zend_execute_data *ex, zend_op_array *
 #endif
 
 	EX(prev_execute_data) = EG(current_execute_data);
-	if (!op_array->run_time_cache) {
+	if (!RUN_TIME_CACHE(op_array)) {
 		init_func_run_time_cache(op_array);
 	}
 	i_init_func_execute_data(op_array, return_value, 1 EXECUTE_DATA_CC);
@@ -2521,11 +2507,6 @@ ZEND_API void zend_init_func_execute_data(zend_execute_data *ex, zend_op_array *
 ZEND_API void zend_init_code_execute_data(zend_execute_data *execute_data, zend_op_array *op_array, zval *return_value) /* {{{ */
 {
 	EX(prev_execute_data) = EG(current_execute_data);
-	if (!op_array->run_time_cache) {
-		ZEND_ASSERT(op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE);
-		op_array->run_time_cache = emalloc(op_array->cache_size);
-		memset(op_array->run_time_cache, 0, op_array->cache_size);
-	}
 	i_init_code_execute_data(execute_data, op_array, return_value);
 }
 /* }}} */
@@ -2867,7 +2848,7 @@ static zend_never_inline zend_execute_data *zend_init_dynamic_call_string(zend_s
 				return NULL;
 			}
 		}
-		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!fbc->op_array.run_time_cache)) {
+		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!RUN_TIME_CACHE(&fbc->op_array))) {
 			init_func_run_time_cache(&fbc->op_array);
 		}
 	} else {
@@ -2885,8 +2866,8 @@ static zend_never_inline zend_execute_data *zend_init_dynamic_call_string(zend_s
 		zend_string_release_ex(lcname, 0);
 
 		fbc = Z_FUNC_P(func);
-		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!fbc->op_array.run_time_cache)) {
-			fbc = init_func_run_time_cache_ex(func);
+		if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!RUN_TIME_CACHE(&fbc->op_array))) {
+			init_func_run_time_cache(&fbc->op_array);
 		}
 		called_scope = NULL;
 	}
@@ -2922,7 +2903,7 @@ static zend_never_inline zend_execute_data *zend_init_dynamic_call_object(zval *
 		return NULL;
 	}
 
-	if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!fbc->op_array.run_time_cache)) {
+	if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!RUN_TIME_CACHE(&fbc->op_array))) {
 		init_func_run_time_cache(&fbc->op_array);
 	}
 
@@ -3009,7 +2990,7 @@ static zend_never_inline zend_execute_data *zend_init_dynamic_call_array(zend_ar
 		return NULL;
 	}
 
-	if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!fbc->op_array.run_time_cache)) {
+	if (EXPECTED(fbc->type == ZEND_USER_FUNCTION) && UNEXPECTED(!RUN_TIME_CACHE(&fbc->op_array))) {
 		init_func_run_time_cache(&fbc->op_array);
 	}