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/* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
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 Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
#ifndef PFS_DIGEST_H
#define PFS_DIGEST_H
/**
@file storage/perfschema/pfs_digest.h
Statement Digest data structures (declarations).
*/
#include "pfs_column_types.h"
#include "lf.h"
#include "pfs_stat.h"
#define PFS_SIZE_OF_A_TOKEN 2
extern bool flag_statements_digest;
extern ulong digest_max;
extern ulong digest_lost;
struct PFS_thread;
/* Fixed, per MD5 hash. */
#define PFS_MD5_SIZE 16
/**
Structure to store a MD5 hash value (digest) for a statement.
*/
struct PFS_digest_key
{
unsigned char m_md5[PFS_MD5_SIZE];
char m_schema_name[NAME_LEN];
uint m_schema_name_length;
};
/** A statement digest stat record. */
struct PFS_ALIGNED PFS_statements_digest_stat
{
/** Digest Schema + MD5 Hash. */
PFS_digest_key m_digest_key;
/** Digest Storage. */
PSI_digest_storage m_digest_storage;
/** Statement stat. */
PFS_statement_stat m_stat;
/** First and last seen timestamps.*/
ulonglong m_first_seen;
ulonglong m_last_seen;
/** Reset data for this record. */
void reset_data();
/** Reset data and remove index for this record. */
void reset_index(PFS_thread *thread);
};
int init_digest(const PFS_global_param *param);
void cleanup_digest();
int init_digest_hash(void);
void cleanup_digest_hash(void);
PFS_statement_stat* find_or_create_digest(PFS_thread *thread,
PSI_digest_storage *digest_storage,
const char *schema_name,
uint schema_name_length);
void get_digest_text(char *digest_text, PSI_digest_storage *digest_storage);
void reset_esms_by_digest();
/* Exposing the data directly, for iterators. */
extern PFS_statements_digest_stat *statements_digest_stat_array;
/* Instrumentation callbacks for pfs.cc */
struct PSI_digest_locker *pfs_digest_start_v1(PSI_statement_locker *locker);
PSI_digest_locker *pfs_digest_add_token_v1(PSI_digest_locker *locker,
uint token,
OPAQUE_LEX_YYSTYPE *yylval);
static inline void digest_reset(PSI_digest_storage *digest)
{
digest->m_full= false;
digest->m_byte_count= 0;
digest->m_charset_number= 0;
}
static inline void digest_copy(PSI_digest_storage *to, const PSI_digest_storage *from)
{
if (from->m_byte_count > 0)
{
to->m_full= from->m_full;
to->m_byte_count= from->m_byte_count;
to->m_charset_number= from->m_charset_number;
DBUG_ASSERT(to->m_byte_count <= PSI_MAX_DIGEST_STORAGE_SIZE);
memcpy(to->m_token_array, from->m_token_array, to->m_byte_count);
}
else
{
DBUG_ASSERT(from->m_byte_count == 0);
to->m_full= false;
to->m_byte_count= 0;
to->m_charset_number= 0;
}
}
/**
Read a single token from token array.
*/
inline int read_token(PSI_digest_storage *digest_storage,
int index, uint *tok)
{
int safe_byte_count= digest_storage->m_byte_count;
if (index + PFS_SIZE_OF_A_TOKEN <= safe_byte_count &&
safe_byte_count <= PSI_MAX_DIGEST_STORAGE_SIZE)
{
unsigned char *src= & digest_storage->m_token_array[index];
*tok= src[0] | (src[1] << 8);
return index + PFS_SIZE_OF_A_TOKEN;
}
/* The input byte stream is exhausted. */
*tok= 0;
return PSI_MAX_DIGEST_STORAGE_SIZE + 1;
}
/**
Store a single token in token array.
*/
inline void store_token(PSI_digest_storage* digest_storage, uint token)
{
DBUG_ASSERT(digest_storage->m_byte_count >= 0);
DBUG_ASSERT(digest_storage->m_byte_count <= PSI_MAX_DIGEST_STORAGE_SIZE);
if (digest_storage->m_byte_count + PFS_SIZE_OF_A_TOKEN <= PSI_MAX_DIGEST_STORAGE_SIZE)
{
unsigned char* dest= & digest_storage->m_token_array[digest_storage->m_byte_count];
dest[0]= token & 0xff;
dest[1]= (token >> 8) & 0xff;
digest_storage->m_byte_count+= PFS_SIZE_OF_A_TOKEN;
}
else
{
digest_storage->m_full= true;
}
}
/**
Read an identifier from token array.
*/
inline int read_identifier(PSI_digest_storage* digest_storage,
int index, char ** id_string, int *id_length)
{
int new_index;
DBUG_ASSERT(index <= digest_storage->m_byte_count);
DBUG_ASSERT(digest_storage->m_byte_count <= PSI_MAX_DIGEST_STORAGE_SIZE);
/*
token + length + string are written in an atomic way,
so we do always expect a length + string here
*/
unsigned char *src= & digest_storage->m_token_array[index];
uint length= src[0] | (src[1] << 8);
*id_string= (char *) (src + 2);
*id_length= length;
new_index= index + PFS_SIZE_OF_A_TOKEN + length;
DBUG_ASSERT(new_index <= digest_storage->m_byte_count);
return new_index;
}
/**
Store an identifier in token array.
*/
inline void store_token_identifier(PSI_digest_storage* digest_storage,
uint token,
uint id_length, const char *id_name)
{
DBUG_ASSERT(digest_storage->m_byte_count >= 0);
DBUG_ASSERT(digest_storage->m_byte_count <= PSI_MAX_DIGEST_STORAGE_SIZE);
uint bytes_needed= 2 * PFS_SIZE_OF_A_TOKEN + id_length;
if (digest_storage->m_byte_count + bytes_needed <= PSI_MAX_DIGEST_STORAGE_SIZE)
{
unsigned char* dest= & digest_storage->m_token_array[digest_storage->m_byte_count];
/* Write the token */
dest[0]= token & 0xff;
dest[1]= (token >> 8) & 0xff;
/* Write the string length */
dest[2]= id_length & 0xff;
dest[3]= (id_length >> 8) & 0xff;
/* Write the string data */
if (id_length > 0)
memcpy((char *)(dest + 4), id_name, id_length);
digest_storage->m_byte_count+= bytes_needed;
}
else
{
digest_storage->m_full= true;
}
}
extern LF_HASH digest_hash;
#endif
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