Fix -Wclass-memaccess warnings in InnoDB

storage/innobase/buf/buf0buf.cc

@@ -2214,8 +2214,8 @@ buf_page_realloc(
 	if (buf_page_can_relocate(&block->page)) {
 		mutex_enter(&new_block->mutex);
 
-		memcpy(new_block->frame, block->frame, UNIV_PAGE_SIZE);
-		memcpy(&new_block->page, &block->page, sizeof block->page);
+		memcpy(new_block->frame, block->frame, srv_page_size);
+		new (&new_block->page) buf_page_t(block->page);
 
 		/* relocate LRU list */
 		ut_ad(block->page.in_LRU_list);

storage/innobase/gis/gis0rtree.cc

@@ -662,7 +662,7 @@ rtr_adjust_upper_level(
 
 	/* Create a memory heap where the data tuple is stored */
 	heap = mem_heap_create(1024);
-	memset(&cursor, 0, sizeof(cursor));
+	cursor.init();
 
 	cursor.thr = sea_cur->thr;
 
@@ -1379,7 +1379,7 @@ rtr_ins_enlarge_mbr(
 		rtr_page_cal_mbr(index, block, &new_mbr, heap);
 
 		/* Get father block. */
-		memset(&cursor, 0, sizeof(cursor));
+		cursor.init();
 		offsets = rtr_page_get_father_block(
 			NULL, heap, index, block, mtr, btr_cur, &cursor);
 

storage/innobase/gis/gis0sea.cc

@@ -1548,7 +1548,7 @@ rtr_copy_buf(
 	will be copied. It is also undefined what will happen with the
 	newly memcpy()ed mutex if the source mutex was acquired by
 	(another) thread while it was copied. */
-	memcpy(&matches->block.page, &block->page, sizeof(buf_page_t));
+	new (&matches->block.page) buf_page_t(block->page);
 	matches->block.frame = block->frame;
 	matches->block.unzip_LRU = block->unzip_LRU;
 

storage/innobase/include/btr0cur.h

@@ -926,6 +926,26 @@ struct btr_cur_t {
 	rtr_info_t*	rtr_info;	/*!< rtree search info */
 	btr_cur_t():thr(NULL), rtr_info(NULL) {}
 					/* default values */
+	/** Zero-initialize all fields */
+	void init()
+	{
+		index = NULL;
+		memset(&page_cur, 0, sizeof page_cur);
+		purge_node = NULL;
+		left_block = NULL;
+		thr = NULL;
+		flag = btr_cur_method(0);
+		tree_height = 0;
+		up_match = 0;
+		up_bytes = 0;
+		low_match = 0;
+		low_bytes = 0;
+		n_fields = 0;
+		n_bytes = 0;
+		fold = 0;
+		path_arr = NULL;
+		rtr_info = NULL;
+	}
 };
 
 /******************************************************//**

storage/innobase/include/btr0pcur.h

@@ -543,6 +543,18 @@ struct btr_pcur_t{
 	/** old_rec_buf size if old_rec_buf is not NULL */
 	ulint		buf_size;
 
+	btr_pcur_t() :
+		btr_cur(), latch_mode(0), old_stored(false), old_rec(NULL),
+		old_n_fields(0), rel_pos(btr_pcur_pos_t(0)),
+		block_when_stored(NULL),
+		modify_clock(0), withdraw_clock(0),
+		pos_state(BTR_PCUR_NOT_POSITIONED),
+		search_mode(PAGE_CUR_UNSUPP), trx_if_known(NULL),
+		old_rec_buf(NULL), buf_size(0)
+	{
+		btr_cur.init();
+	}
+
 	/** Return the index of this persistent cursor */
 	dict_index_t*	index() const { return(btr_cur.index); }
 };

storage/innobase/row/row0uins.cc

 /*****************************************************************************
 
 Copyright (c) 1997, 2017, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2017, MariaDB Corporation.
+Copyright (c) 2017, 2018, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -202,8 +202,6 @@ row_undo_ins_remove_sec_low(
 	enum row_search_result	search_result;
 	const bool		modify_leaf = mode == BTR_MODIFY_LEAF;
 
-	memset(&pcur, 0, sizeof(pcur));
-
 	row_mtr_start(&mtr, index, !modify_leaf);
 
 	if (modify_leaf) {